Assembly of TMA on Gold
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金子首饰赏析英文作文高中英文回答:Jewelry, a testament to human creativity and ingenuity, has been an integral part of adornment for centuries. From intricate necklaces to elegant earrings, gold jewelry has captivated hearts with its timeless beauty and intrinsic value.Gold, the precious metal, embodies both allure and durability. Its warm, lustrous glow evokes a sense of opulence, while its exceptional malleability allows for intricate craftsmanship. Gold jewelry, therefore, represents a harmonious blend of art and functionality.Necklaces, draped elegantly around the neck, add a touch of sophistication to any outfit. Gold necklaces come in a myriad of designs, from delicate chains to statement-making pendants.Intricate earrings, adorning the ears, draw attention to the face and frame the features. Gold earrings offer a wide range of styles, from classic studs to elaborate chandeliers.Bracelets, encircling the wrist, lend a touch of charm and elegance. Gold bracelets come in various forms, from sleek bangles to ornate cuffs.Rings, worn on fingers, symbolize commitment, love, and personal style. Gold rings come in a vast array of designs, from simple bands to elaborate engagement rings.Gold jewelry, whether a cherished heirloom or a contemporary masterpiece, evokes a sense of timeless elegance and personal connection. Its versatility allows it to complement both formal attire and casual wear, making it an enduring favorite among jewelry enthusiasts worldwide.中文回答:黄金首饰赏析。
Gold English 知多少?∙abolishment of obligatory payments in gold 解除用黄金支付的义务∙Abyssinian gold 埃塞俄比亚假金∙Aix gold leaf 艾克斯假金叶∙alluvial gold 冲积砂金∙anti-gold policies 反黄金政策∙available stocks of gold 可动用的黄金∙blue gold 蓝金; 金铁合金∙Bolley's gold purple 波利紫金色料∙buy and change gold 收兑金银外币∙cadmium gold 镉金装饰合金∙casting gold 铸造金∙cat gold 金色云母∙cataractopiesis with gold (metal) needle 金针拨障∙clutch gold 铜箔∙coin gold 币金∙coinage gold 金币合金∙colloidal gold 胶体金∙colloidal gold test 胶体金试验∙convertibility of dollar into gold 美元兑换黄金∙convertible gold note 可兑换金券∙copper gold 含铜金矿∙current gold and silvercoin 通用金银硬币∙decoration with liquid gold 描金∙devaluation of dollar in terms of gold 美元对黄金的贬值∙Dolgelley gold belt 多尔格利金带∙dollar-gold standard 美元黄金本位∙Dutch gold 荷兰金; 荷兰饰金; 黄铜箔∙embargo on the export of gold 禁止黄金出口∙evaporated gold antimony contact 蒸发的金锑接触∙face-centered cubic copper-gold alloy 面心立方铜金合金∙Figuier's gold purple 菲格尔金紫色料∙filled gold 填金∙fine gold 纯金∙fineness of gold 金成色∙flake gold 片金∙flitter gold 黄铜箔∙flour gold 粉金∙fool's gold 黄铜矿∙fool s gold 黄铁矿∙foreign bills payable in gold 以黄金支付的外国汇票∙four-colo(u)r gold 四色金∙free gold 游离金; 自然金∙free gold bullion basis 金块的自由输出入∙free gold reserve 可动用的黄金储备∙free-milling gold 易汞齐化金∙French gold 铜锌锡合金∙Fuch's gold purple 福契氏紫金颜料∙fulminating gold 雷酸金∙germanium-gold eutectic mixture 锗金低共熔混合物∙gold 金; 黄金∙gold 18 carats pure 十八开金∙gold alloy solder 金合金焊∙gold analyzer 黄金含量分析仪∙gold and silver assay 金银鉴定∙gold and silver control 金银管理∙gold assay 金鉴定∙gold auctions 拍卖黄金∙gold blackbody 金黑体∙gold blocking 烫金∙gold bond 以黄金偿付的债券∙gold bonding wire 金键合线; 金连接线∙gold bonds 金债券∙gold brick 金砖∙gold bronze 金青铜∙gold bullion 金锭∙gold bullion market 金块市场∙gold bullion standard 金块本位; 纯金本位制∙gold bullion standard system 金块本位制∙gold card 金卡∙gold certificate 金券∙gold certificate (美国) 金库券∙gold chloride 氯化金∙gold coin and bullion 金币和金块∙gold coin clause 金币条款∙gold coin standard 金币本位; 金铸币本位制∙gold coin standard system 金铸币本位制∙gold coins 金币∙gold colloidal 放射性胶体金∙gold currency 金本位货币∙gold currency standard 金通货本位制∙gold currency standard system 金本位制∙gold cushion 烫金垫∙gold cyanide 氰化金∙gold detector 黄金探测器∙gold dichloride 二氯化金∙gold dioxide 二氧化金∙gold dollar bill 美币票据∙gold doping 掺金∙gold dredger 采金船∙gold dust 金粉∙gold embargo 禁止黄金出口∙gold exchange 金汇兑∙gold exchange standard 金币兑换制∙gold exchange standard (GES) 金汇兑本位制∙gold exchange standard system 金汇兑本位制∙gold filigree 金属镶嵌∙gold film mercury detector 金膜测汞仪∙gold fix 议定金价∙gold foil 金箔∙gold franc 金法郎∙gold hydroxide 氢氧化金∙gold ingot 金锭∙gold issues 金矿股票∙gold laser 金激光器∙gold mines index 金矿指数∙gold mining 采掘黄金∙gold money 金币; 金货币∙gold number 金值∙gold number test 金值试验∙gold ore 金矿∙gold oxide 氧化金∙gold parity 金平价∙gold pin porcelain tooth 黄金钉瓷牙∙gold plate scissors 金片剪∙gold plated contact 镀金触点∙gold plated frame 镀金镜架∙gold plated PVC flexible hose 镀金聚氯乙烯软管∙gold plated watch bracelet 镀金表链∙gold plating 镀金∙gold plating thickness 镀金厚度∙gold plugger 金箔充填器械∙gold point 金点; 输金点∙gold polyneuritis 金中毒性多神经炎∙gold potassium chloride 氯化金钾∙gold potassium cyanide 氰化亚金钾∙gold powder 金粉∙gold premium policy 金币升水政策∙gold price fluctuations 金价波动∙gold ripeness 黄熟∙gold rush 淘金热∙gold salt 氯化钠金∙gold sandwich contact 金夹层接触∙Gold schmidt 铝热焊∙gold shares 金矿股票∙gold size 金胶; 贴金漆∙Gold slide 戈尔德计算尺∙gold sodium chloride 氯化钠金∙gold sodium cyanide 氰化钠金∙gold sodium thiomalate 硫代苹果酸金钠∙gold sodium thiosulfate 硫代硫酸钠金∙gold solder 金焊∙gold specie standard 金币本位∙gold spot 金斑病∙gold spring 金簧∙gold stamping 烫金∙gold standard 金本位; 金本位制∙gold standard act 金本位制法∙gold standard system 金本位制∙gold sterilization 限制黄金作用的货币政策∙gold sterilization policy 限制黄金作用的货币政策∙gold stomatitis 金毒性口炎∙gold stoving varnish 金色烤漆∙gold tail moth 桑毛虫∙gold tooling 烫金工具∙gold tribromide 三溴化金∙gold trichloride 三氯化金∙gold tricyanide 三氰化金∙gold trihydroxide 三氢氧化金∙gold trioxid 三氧化二金∙gold trisulfide 三硫化二金∙gold-black coating 金黑涂层∙gold-bonded contact 金键合接触∙gold-bonded diode 金键二极管∙gold-bricking 限制生产定额∙gold-doped 掺金的∙gold-doped germanium 锗掺金∙gold-doped germanium detector 掺金锗探测器∙gold-doped germanium infrared detector 掺金锗红外探测器∙gold-doped transistor 掺金型晶体管∙gold-filled 包金∙gold-film glass 包金膜玻璃; 涂金膜玻璃∙gold-imitation processing technology 仿金工艺技术∙gold-overlaid 贴金∙gold-plating 镏金∙gold-platinum alloy clasp-wire 金铂合金卡环丝∙gold-point blackbody 金点黑体∙gold-secured loans 以黄金作抵押的贷款∙gold-sol reaction 金胶液试验∙gold-sol test 金胶液试验∙gold-vanadium alloy 金钒电阻合金∙greasy gold 纯金∙green gold 绿金∙gulch-gold 砂金∙high-purity gold 高成色黄金∙honey-gold 蜜黄色∙hot-pressed gold 热压金∙Hume gold flow equilibrating mechanism 休姆黄金流动平衡作用∙imitation gold yarn 充金线∙import gold point 进口黄金点∙instability of gold market prices 市场金价的不稳定∙isinglass gold-size 鱼胶贴金漆∙Japanese blue gold 日本蓝金∙lacquer with gold design 描金漆器∙legal gold content 法定含金量∙legally prescribed gold content 法定含金量∙liquid bright gold 液体亮金∙liquid palladium gold 钯金水∙lode gold 脉金∙London gold market 伦敦黄金市场∙Manila gold 马尼拉假金∙Manilla gold 铅黄铜∙Mannheim gold 曼海姆金; 曼海姆铜锌锡代金合金∙milk gold 乳金∙minimum ratio of gold reserve 最低黄金准备比率∙Mock gold 莫克金; 莫克铜铂合金; 铂铜合金∙mosaic gold 仿金铜箔∙Mosaic gold 莫塞克黄铜型假金; 铜锌合金∙mosaic gold alloy 嵌镶金合金∙moss gold 苔状金∙mountain gold 山金∙mussel gold (色料) 淡菜金∙native gold 自然金∙new gold exchange standard system 新金汇本位制∙non-monetary gold 非货币性黄金∙nonmonetarized gold 非货币化黄金∙nonmonetary gold 非货币化黄金∙Nuremberg gold 铜铝金装饰合金∙off the gold standard 放弃金本位∙official gold content 法定含金量∙official gold price 法定金价∙official stipulation on the gold content 法定含金量∙open-face gold crown 露面金冠∙palladium-gold polarium 钯金合金∙paper gold (国际货币基金组织特别提款权的别称) 纸黄金∙parity of gold and silver 金银比价∙pink gold 金银铜镍装饰合金∙potassium gold chloride 氯化金钾∙potassium gold cyanide 氰化亚金钾∙powdered gold 粉化金∙primary gold-bearing sulfide 原生含金硫化物∙proof gold 纯金∙proof gold (试金用) 标准金∙pure gold 纯金; 赤金; 足金∙raise gold content 提高含金量∙Ranvier's gold chloride staining method 朗飞氏氯化金染色法∙ratio of gold and silver 金银比价∙red gold 纯金∙red gold alloy 红金合金∙reef gold 石英脉金∙refractory gold 难选金∙rich gold metal 金争黄铜∙rolled gold 轧制金箔; 金箔; 包金∙rolled gold watch 包金表∙run on gold against US dollars 美元挤兑黄金的风潮∙rusty gold 锈金; 难混汞的金; 自然金∙seamless gold crown 无缝金壳冠∙self-recording gold-leaf electroscope 自记式金箔验电器∙sintered gold 烧结金∙sodium gold chloride 氯化钠金∙sodium gold cyanide 氰化钠金∙solid gold 纯金; 赤金; 足金∙solid-gold chain 纯金项链∙solid-gold pendant 纯金挂件∙spring gold 弹簧金∙standard gold 标金; 标准金∙sterling gold 标准纯金∙stream gold 河金∙suspension of the dollar's conversion into gold 美元停止兑换黄金∙Swiss gold franc 瑞士金法郎∙Swiss gold-trading pool 瑞士黄金联营∙Talmi gold 镀金黄铜∙tilted gold-leaf electrometer 倾斜金箔静电计∙two-tier gold market 双重黄金市场∙two-tier gold price system 双重金价制∙Waechtler's gold purple 威奇特勒紫金色料∙white gold 白金∙white gold alloy 白色金银合金∙white gold jewelry alloy 白金首饰合金∙white gold solder 白金焊料∙winnowing gold 风选金矿法∙yellow gold 金银铜合金∙yelow gold 黄银铜合金。
收购金条英语作文Title: Acquisition of Gold Bars。
In the dynamic realm of finance, the acquisition of gold bars holds a significant allure for investors seeking stability and diversification. In this essay, we delve into the multifaceted aspects of procuring gold bars, exploring its implications, advantages, and considerations.First and foremost, why invest in gold bars? Gold, renowned for its intrinsic value and time-tested status as a hedge against economic uncertainties, stands as atangible asset offering a store of value. Unlike fiat currencies susceptible to inflationary pressures, gold maintains its purchasing power over time, making it a favored choice for wealth preservation.One compelling reason to acquire gold bars is portfolio diversification. Modern investment principles advocate spreading risk across different asset classes to mitigatevolatility. Gold, with its low correlation to traditional financial assets such as stocks and bonds, serves as an effective diversifier, enhancing the resilience of an investment portfolio against market downturns.Moreover, gold bars provide a safe haven in times of geopolitical instability or economic turmoil. History bears witness to gold's role as a refuge asset during crises, as investors flock to its perceived safety, thereby driving up its price. The tangible nature of gold bars imparts a sense of security, transcending geopolitical boundaries and political regimes.However, the acquisition of gold bars warrants careful consideration and due diligence. One must evaluate various factors such as purity, weight, and authenticity when purchasing gold bars. Verifying the credibility of the seller and ensuring compliance with regulatory standards are imperative steps to safeguard against counterfeit or substandard products.Furthermore, storage considerations play a pivotal rolein gold bar acquisition. Unlike financial assets held in digital or paper form, physical gold bars necessitate secure storage arrangements to mitigate risks of theft or damage. Options range from bank vaults to private depositories, each with its associated costs and security measures.Another aspect to contemplate is liquidity. While gold enjoys global recognition and liquidity, converting gold bars into cash may entail certain transactional costs and market spreads. Thus, investors should factor in liquidity considerations when incorporating gold bars into their investment strategy.In addition to individual investors, central banks also engage in gold bar acquisition as part of their reserve management strategy. The accumulation of gold reserves bolsters a central bank's credibility and serves as a bulwark against currency devaluation or external shocks to the economy.In conclusion, the acquisition of gold bars embodies aprudent investment strategy, offering stability, diversification, and a hedge against economic uncertainties. However, prospective investors must exercise caution, conducting thorough research and due diligence to navigate the intricacies of the gold market. Ultimately, gold bars represent more than mere financial assets; they symbolize a timeless store of value transcending generations.。
The Enigma of the Golden ScepterIn the annals of human history, artifacts and relics have often served as silent witnesses to the grandeur and mysteries of past civilizations. Among these, the golden scepter, a symbol of royal authority and divine sanction, stands out as a particularly fascinating and enigmatic object. Its allure lies not just in its opulent craftsmanship and material value, but also in thenarratives it unearths about power, culture, and the intricate web of human society.The golden scepter, often adorned with precious stones and intricate designs, is a testament to the technological prowess and aesthetic sensibilities of ancient craftsmen. Its very existence speaks of a society that valued not just material wealth but also the symbolism and ritual associated with royal power. The meticulous attention to detail, the use of precious metals, and the integration of cultural motifs all reflect a deep understanding of the symbolic language of power and a desire to communicate that power visually and tangibly.But beyond its material and aesthetic value, the golden scepter also holds a place in the historical record as a key to unlocking the political and social dynamics of its time. It was not just a tool of rule but also a medium of communication, a bridge between the divine and the mortal, and a symbol of the divine right of kings to govern. In many cultures, the scepter was believed to have been bestowed upon the ruler by a deity, conferring upon them the mandate to rule and the obligation to uphold the welfare of their subjects.The study of golden scepters, therefore, offers a window into the past, allowing us to peer into the inner workings of ancient societies and the complexities of power structures. They are not just objects of beauty but also repositories of historical knowledge, containing clues to the rise and fall of civilizations, the evolution of political ideologies, and the changing nature of power relationships.Moreover, the golden scepter serves as a reminder of the enduring nature of human ambition and the quest for power. Throughout history, the allure of the scepter hastempted many to seek the throne, leading to conflicts, wars, and the rise and fall of empires. In this sense, the golden scepter is not just a material object but also a metaphorfor the perils and promises of power.In conclusion, the golden scepter is much more thanjust a luxurious artifact. It is a symbol of power, a repository of history, and a window into the human questfor authority and divinity. Its study, therefore, offers a profound understanding of human society, its complexities, and the enduring nature of the human desire for power and control.**金杖之谜**在人类历史的篇章中,文物和遗迹常常是过去文明的辉煌与神秘的沉默见证者。
A String Of Blue Beads最昂贵的圣诞礼物Pete Richard was the loneliest man in town. On the day Jean Grace opened the door of his shop. It's a small shop which had come down to him from his grandfather. The little front window was strewn with a di sarray of old-fashioned things: bracelets and lockets worn in days before the Civil War, gold rings and silver boxes, images of jade and ivory, porcelain figurines. On this winter's afternoon a child was standing there, her forehead against the glass, earnest and enormous eyes studying each treasure as if she were looking for something quite special. Finally she straightened up with a satisfied air and entered the store.The shadowy interior of Pete Richard's establishment was even more cluttered than his show window. Shelves were stacked with jewel caskets, dueling pistols, clocks and lamps, and the floor was heaped with irons, mandolins and things hard to find a name for. Behind the count er stood Pete himself, a man not more than thirty but with hair already turning gray. There was a bleak air about him as he looked at the small c ustomer who flattened her ungloved hands on the counter.“Mister,”she began,“would you please let me lookat the string of blue beads in the window?”Pete parted the draperies and lifted out a necklace. The turquoise stones gleamed brightly against the pallor of his palm as he spread the ornament before her. “They're just perfect,”said the child, entirely to herself.“Will you wrapthem up pretty for me, please?”Pete studied her with a st ony air.“Are you buying thesefor someone?”“They’re for my big sister. She takes care of me. You see, this will be the first Christmas since Mother died. I've been looking for the most wonderful Christmas present for my sister.”“How much money do you have?”asked Pete warily.She had been busily untying the knots in a handkerchief and now she poured out a handful of pennies on the counter.“I emptied my bank.”she explained simply.Pete looked at her thoughtfully. Then he carefully drewback the necklace. The price tag was visible to him but not to her. How could he tell her? The trusting look of her blue eyes smote him like the pain o f an old wound.“Just a minute, he said, and turned toward the back of the store. Over his shoulder he called, “What's your na me?”He was very busy about something.“Jean Grace.”When Pete returned to where Jean Grace waited, apackage lay in his hand, wrapped in scarlet paper and tied with a bow of green. “There you are,”he said shortly,“Don't lose it on the way home.”She smiled happily over her shoulder as she ran outthe door. Through the window he watched her go, while desolation flooded his thoughts. Something about Jean Grace and her string of beads had stirred him to the depths of a grief that would not stay buried. The child's hair was wheat yellow, her eyes sea blue, and once upon a time, not long before, Pete had been in love with a girl with hair of that same yellow and with eyes just as blue. And the turquoise necklace was tohave been hers.But there had come a rainy night-a truck skidding ona slippery road—and the life was crushed out of his dream. Since then, Pete had lived too much with his grief in solitude. He was politely attentive to customers, but after hours his world seemed irrevocably empty. He was trying to forget in a self-pitying haze that deepened day by day. The blue eyes of Jean Grace jolted him into acute remembrance of what he had lost. The pain of it made him recoil from the exuberance of holiday shoppers. During the next ten days trade was brisk; chattering women swarmed in, fingering trinkets, trying to bargain. When the last c ustomer had gone, late on Christmas ”Eve, he sighed with relief. It was over for another year. But for Pete the night was not quite over.The door opened and a young woman hurried in. Withaninexplicable start, he realized that she looked familiar, yet he could not remember when or where he had seen her before. Her hair was golden yellow and her large eyes were blue. Without speaking, she drew from her purse a package loosely unwrapped in its red paper, a bow of green ribbon with it. Presently the string of blue beads lay gleaming again before him.“Did this come from your shop?”she asked.Pete raised his eyes to hers and answered softly,“Yes, it did.”“Are the stones real?”“Yes. Not the finest quality—but real.”“Can you remember who it was you sold them to?”“She was a small girl. Her name was Jean. She boughtthem for her older sister's Christmas present.”“How much are they worth?”“The price,”he told her solemnly,“is alway s aconfidential matter between the seller and the customer.”“But Jean has never had more than a few pennies ofspending money. How could she pay for them?”“She paid the biggest price anyone can ever pay,”hesaid.“She gave all she had.”There was a silence then that filled the little curio shop.He saw the faraway steeple, a bell began ringing. The sound of the distant chiming, the little package lying on the counter, the question in the eyes of the girl, and the strange feeling of renewal struggling unreasonably in the heart of Pete, all had come to be because of the love of a child.“But why did you do it?”He held out the gift in his hand.“It's already Christmas morning,”he said.“And it's mymisfortune that I have no one to give anything to. Will you let me see you home and wish you a Merry Christmas at your door?”And so, to the sound of many bells and in the midst of happy people, Pete Richard and a girl whose name he had yet to hear, walked out into the beginning of the great day that brings hope into the world for us all.皮特·理查德是镇上最孤独的人,就在那天,珍·格雷斯打开了他小店的门。
Product Information Guide产品信息指南 | 產品資訊指南 | Informační příručka produktu | Guide d'information sur le produit | Produktinformationshandbuch | Termékinformációs kézikönyv | Panduan Informasi Produk | 製品情報ガイド | 제품 정보 안내 | Przewodnik z informacjami o produkcie | Guia de Informações do Produto | Информационноеруководствопопродуктам | Informácie o produkte | Priročnik z informacijami o izdelku | Guía de información del producto | Ürün Bilgileri Kılavuzu |רצומ עדימ ךירדמProduct Information GuideNotes, Cautions, and WarningsNOTE: A NOTE indicates important information that helps you make better use of your computer.CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem.WARNING: A WARNING indicates a potential for property damage, personalinjury, or death.____________________©2012–2014Dell Inc. All Rights Reserved2014 - 08P/N RGD3K Rev. 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Doing so can cause fire or electric shock.•Do not attempt to service the equipment yourself, except as explained in your documentation or in instructions otherwise provided to you by the manufacturer.Always follow installation and service instructions closely.•If your hardware has a voltage selection switch on the power supply, be sure to set it for the voltage that most closely matches the AC power available at your location.Product Information Guide3•Operate the equipment only from the type of external power source indicated on the electrical ratings label.•To avoid possible damage to the system board, wait 30 seconds after turning off the equipment before removing a component from the system board or disconnectinga peripheral device from the equipment.•For non-rack-mounted servers, leave 10.2 cm (4 in) minimum of clearance on all vented sides of the equipment to permit the airflow required for proper ventilation.Restricting airflow can damage the equipment or cause overheating.•Do not stack equipment or place equipment so close together that it is subject to re-circulated or preheated air, such as next to an appliance or exhaust vent.•Ensure that nothing rests on your equipment's cables.•Move equipment with care; ensure that all casters and/or stabilizers are firmly connected to the system. Avoid sudden stops and uneven surfaces.•Review the weight limits referenced in your equipment documentation before placinga monitor or other device on top of your equipment.•Use only approved power cable(s) rated for the equipment. The voltage and current rating of the cable should be greater than the ratings marked on the equipment.•Plug the equipment power cables into properly grounded electrical outlets.Do not use adapter plugs or remove the grounding prong from a cable. If you must use an extension cable, use a 3-wire cable with properly grounded plugs.•Observe extension cable and power strip ratings. Ensure that the total ampere rating of all equipment plugged into the extension cable or power strip does not exceed 80 percent of the ampere ratings limit for the extension cable or power strip.•To help protect the equipment from fluctuations in electrical power, use a surge suppressor, line conditioner, or uninterruptible power supply (UPS).CAUTION: Incorrectly installing a battery or using an incompatible battery may increase the risk of fire or explosion. Replace the battery only with the same or equivalent type.•Do not disassemble, crush, or puncture batteries.•Do not store or place your battery pack next to or in a heat source such as a fire, heat-generating appliance, car, or exhaust vent. Heating battery cells to temperaturesabove 65 °C(149 °F) can cause explosion or fire.•Do not attempt to open or service batteries. Do not dispose of batteries in a fire or with household waste. See Battery Disposal instructions.4Product Information GuideProduct Information Guide 5WARNING: Additional Instructions for Rack-Mounted Systems.CAUTION: If installed in a closed or multi-unit rack assembly, the operating ambienttemperature of the rack environment may be greater than room ambient. Therefore, consideration should be given to installing the equipment in an environment compatible with the maximum ambient temperature (Tma) specified by the manufacturer. For more information, see your product documentation.•Your rack kit has been approved only for the rack cabinet provided. It is your responsibilityto ensure that installation of the equipment into any other rack complies with allapplicable standards. The manufacturer disclaims all liability and warranties with respect to combinations of equipment with any other rack.•Before installing your equipment in a rack, install all front and side stabilizers. Failure to install stabilizers can allow the rack to tip over.•Always load from the bottom up, and load the heaviest items first.•Do not overload the AC power supply branch circuit that provides power to the rack.•Do not stand or step on any components in the rack. WARNING: Slide/rail mounted equipment is not to be used as a shelf or work space.Do not add weight to slide/rail mounted equipment.The following statement applies only to rack-installed products that areGS-Marked : This equipment is not intended for use at workplaces with visual display units, in accordance with §2 of the German ordinance for workplaces with visual display units.WARNING: For equipment using - (48–60) V DC power supplies, a qualified electrician must perform all connections to DC power and to safety grounds. Do not attempt connecting to DC power or installing grounds yourself.CAUTION: Systems using - (48-60) V DC power supplies may have a connection between the earthed conductor of the DC power supply circuit and the earthing conductor. “如果该设备标示有标识,表示加贴该标识的设备仅按海拔2000m进行安全设计与评估,因此,仅适用于在2000m以下安全使用,在海拔2000m以上使用时,可能有安全隐患” “如果该设备标示有此标识,表示加贴该标识的设备仅按非热带气候条件进行安全设计与评估,因此,仅适用于非热带气候条件安全使用,在热带气候条件使用时,可能有安全隐患” The system using a DC power supply must be connected directly to the system-earthing electrode conductor, to a bonding jumper from an earthing terminal bar, or the bus to which the system earthing electrode conductor is connected.The system using a DC power supply must be located in the same immediate area (such as adjacent cabinets) as any other equipment that has a connection between the earthed conductor of the same DC power supply circuit and the earthing conductor, and also the point of earthing of the DC-powered system.The DC power supply must be located within the same premises as the equipment. Switching or disconnecting devices must not be in the earthed circuit conductor between the source of the DC power supply and the point of the connection of the earthing electrode conductor.Instructions for the Qualified Electricians ONLY:Systems using –(48–60) V DC Power Supplies are intended for restricted access locations in accordance with Articles 110-5, 110-6, 110-11, 110-14, and 110-17 of the National Electrical Code, American National Standards Institute (ANSI)/National Fire Protection Association (NFPA) 70.Before connecting safety ground or power cables, ensure that the power is removed from the DC circuit. To ensure that the power is off, locate the circuit breaker on the DC source circuit (usually at the power distribution of the battery distribution fuse bay). Switch the circuit breaker to the off position and, if available, install an approved safety locking device on the circuit breaker or switch.While grounding techniques may vary, a positive connection to a safety (earth) ground is a requirement.When installing the unit, the ground connection must always be made first and disconnected last to prevent a hazard.Never defeat the ground conductor or operate the equipment in the absence of a suitably installed ground conductor. Contact the appropriate electrical inspection authority or an electrician if you are uncertain that suitable grounding is available.The system chassis must be securely grounded to the rack cabinet frame. Do not attempt to connect power to the system until grounding cables are connected.When stranded wiring is required, use approved wiring termination, such as closed-loop or spade-type with upturned lugs. These terminations should be the appropriate size for the wires and must be double crimped, one on the conductor and one on the insulation. For additional information, see the cabling instructions provided with your system.6Product Information GuideProduct Information Guide 7Ergonomic InstructionsWARNING: Improper or prolonged keyboard use may result in injury.WARNING: Viewing a display or external monitor screen for extended periods of time may result in eye strain.Environmental ConsiderationsBattery DisposalRefer to your system documentation for battery replacement instructions.Do not dispose of the battery along with household waste. Contact your local waste disposal agency for the address of the nearest battery deposit site.Batteries DirectiveIn the European Union (EU), this label indicates that the batteries in thisproduct should be collected separately and not disposed of with householdwaste. Substances in batteries can have a potential negative impact on healthand environment and you have a role in recycling waste batteries thuscontributing to the protection, preservation, and improvement of the qualityof the environment. Y ou should contact your local authority or retailer fordetails of the collection and recycling schemes available.Waste Electrical and Electronic Equipment (WEEE) DirectiveIn the European Union, this label indicates that this product should not bedisposed of with household waste. It should be deposited at an appropriatefacility to enable recovery and recycling.EU REACH SVHC DisclosureREACH (Registration, Evaluation, Authorization, and Restriction of Chemicals, EC 1907/2006) is the European Union’s (EU) chemical substances regulatory framework.REACH requires the producer to provide customers with sufficient information on Substances of Very High Concern (SVHC) contained in products in concentration above 0.1% weight by weight (w/w) to allow safe use of the product.8Product Information Guide EU RoHSThe Restriction of Hazardous Substances Directive (2011/65/EU) is a European Union directive. Through internal design controls and supply chain declarations, this system has been verified to comply with the EU RoHS Directive. In addition, eleventh generation (11G) and future generation base servers have been designed without leveraging EU RoHS exemption 7b: lead in solders for servers, storage and storage array systems, network infrastructure equipment for switching, signaling, transmission as well as network management for telecommunications. This is commonly referred to as RoHS 6/6 compliant.Regulatory NoticesFor additional regulatory information, see the Regulatory Compliance homepage at/regulatory_compliance .Electromagnetic Interference (EMI) is any signal or emission, radiated in free space or conducted along power or signal leads, that endangers the functioning of radio navigation or other safety service or seriously degrades, obstructs, or repeatedly interrupts a licensed radio communications service. Radio communications services include but are not limited to AM/FM commercial broadcast, television, cellular services, radar, air-traffic control, pager, and Personal Communication Services (PCS). These licensed radio services, and unlicensed radio services, such as WLAN or Bluetooth, along with unintentional radiators such asdigital devices, including computer systems, contribute to the electromagnetic environment.Electromagnetic Compatibility (EMC) is the ability of items of electronic equipment to function properly together in the electronic environment. While this computer system has been designed and determined to be compliant with regulatory agency limits for EMI, there is no guarantee that interference will not occur in a particular installation.These products are designed, tested, and classified for their intended electromagnetic environment. These electromagnetic environment classifications generally refer to the following harmonized definitions:•Class B products are intended for use in residential/domestic environments but may alsobe used in non-residential/non-domestic environments. NOTE: The residential/domestic environment is an environment where the use ofbroadcast radio and television receivers may be expected within a distance of10m from where this product is used.•Class A products are intended for use in non-residential/non-domestic environments.Class A products may also be utilized in residential/domestic environments but may cause interference and require the user to take adequate corrective measures.If this equipment does cause interference with radio communications services, which can be determined by turning the equipment off and on, you are encouraged to try to correct the interference by one or more of the following measures:•Reorient the receiving antenna.•Relocate the computer with respect to the receiver.•Move the computer away from the receiver.•Plug the computer into a different outlet so that the computer and the receiver are on different branch circuits.If necessary, consult an authorized Technical Support representative or an experiencedradio/television or EMC technician for additional suggestions.Information Technology Equipment (ITE), including peripherals, expansion cards, printers, input/output (I/O) devices, monitors, and so on, that are integrated into or connected to the system should match the electromagnetic environment classification of the computer system.A Notice About Shielded Signal Cables: Use only shielded cables for connecting peripherals to any device to reduce the possibility of interference with radio communications services. Using shielded cables ensures that you maintain the appropriate EMC classification for the intended environment. It has been determined that this product is a Class A harmonized product. The following sections provide country-specific EMC/EMI or product safety information.FCC Notice (U.S. Only)Class AThis product has been tested and found to comply with the limits for a Class A digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.This product generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the manufacturer's instruction manual, may cause harmful interference with radio communications. Operation of this product in a residential area is likely to cause harmful interference, in which case you will be required to correct the interference at your own expense. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:•This device may not cause harmful interference.•This device must accept any interference received, including interference that may cause undesired operation.Notice: The FCC regulations provide that changes or modifications not expressly approvedby Dell Inc. could void your authority to operate this equipment.These limits are designed to provide reasonable protection against harmful interference ina non-residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference with radio or television reception, which can be determined by turning the equipment off and on, you are encouraged to try to correct the interference by one or more of the following measures:•Reorient or relocate the antenna of the radio/television receiver.•Increase the separation between this equipment and the radio/television receiver. •Plug the equipment into a different outlet so that the equipment and the radio/television receiver are on different power mains branch circuits.•Consult an authorized service technician or an experienced radio/television technician for additional suggestions.Product Information Guide9Company name: Dell Inc. is the responsible party for this product. For an EMC compliance issue or a regulatory inquiry, please use the following contact information:Dell Inc.Worldwide Regulatory Compliance, Engineering and Environmental AffairsOne Dell Way PS4-30Round Rock, Texas 78682 USA512-338-4400Industry Canada, Class AThis Class A digital apparatus complies with Canadian ICES-003.Notice: The Industry Canada regulations provide that changes or modifications not expressly approved by Dell Inc. could void your authority to operate this equipment.Industry Canada, Classe ACet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.Avis: Dans le cadre des réglementations d'Industry Canada, vos droits d'utilisation de cetéquipement peuvent être annulés si des changements ou modifications non expressément approuvés par Dell Inc. y sont apportés.CE NoticeThis product has been determined to be in compliance with 2006/95/EC (Low Voltage Directive), 2004/108/EC (EMC Directive), and amendments of the European Union. Versions of this product may have integrated modules or add-in cards supporting wireless and telecommunications operations. These wireless and telecommunications peripherals have been assessed as compliant in this product and, when present, are in compliance with 1999/5/EC (R&TTE Directive, for Radio and Telecommunications Interfaces).European Union, Class AWARNING: This is a Class A product. In a domestic environment this product may cause radio frequency interference in which case the user may be required to take adequate measures.A "Declaration of Conformity" in accordance with the preceding directives and standards has been made and is on file at Dell Inc. Products Europe BV, Limerick, Ireland.Simplified Chinese Class A Warning Notice (China Only)10Product Information GuideProduct Information Guide 11VCCI Notice (Japan Only)KCC Notice (Republic of Korea Only)다음은 KCC 규정 준수에 따라 본 설명서에서 언급하고 있는 A등급 장치에 관한 것입니다. • 인증 수취인:Dell Inc.Worldwide Regulatory Compliance, Engineering and Environmental Affairs One Dell Way PS4-30Round Rock, Texas 78682 USA 512-338-4400• 장비 또는 모델명: 이 정보에 관한 제품 레이블을 참조하십시오. • 인증 번호:KCC 로고 바로 밑에 있는 인증 번호를참조하십시오.• 제조일:각각의 제품에는 제조 날짜가 인쇄되어있습니다. 이 날짜는 바코드 형태로 되어 있을것입니다.• 제조국가:이 정보에 관한 제품 레이블을 참조하십시오.상기 각각의 제품에는 제조 날짜가 인쇄되어 있습니다.BSMI Notice (Taiwan Only)12Product Information Guide产品信息指南注、小心和警告注:“注”表示可以帮助您更好地使用计算机的重要信息。
英语章节书《the goose's gold》简介全文共3篇示例,供读者参考篇1The Goose's Gold by Michael Morpurgo - A Review by a Student'The Goose's Gold' is an awesome adventure book by the celebrated children's author Michael Morpurgo. It's set in the countryside of Devon, England and follows the story of a young girl named Leila and her quest to unravel the mystery of her family's past.The book starts off with Leila visiting her grandparents' old farm for the summer holidays. Her granddad is getting on a bit and has moved into a care home, but her grandma still lives in the farmhouse. On her first night there, Leila finds an old wooden-carved goose figure up in the attic among a bunch of dusty boxes and trunks. The goose is really intricately made and has a secret compartment in its body with a rolled up piece of paper inside it. The paper turns out to be a coded message!Leila gets dead curious about what the code could mean and where the carved goose figure came from. With the help of hergrandma, she starts piecing together clues from the family's past. It seems the goose has been passed down through generations from a Dutch ancestor who migrated to England way back in the 1600s during times of religious persecution. The code was used by the Dutch underground resistance to smuggle messages and treasures away from the occupying forces.As Leila and her grandma follow the trail of clues from the carved goose figure, they get embroiled in more and more crazy adventures. They have to go on a treasure hunt to different places around the countryside based on obscure lines from ancient Dutch poems and riddles deciphered from the coded message. There's an abandoned mine, a haunted church, a maze of underground tunnels, all sorts! Best of all, they team up with a quirky local guy called Mr Wilbur who is an amateur cryptologist and loves cracking codes.At each location on their treasure hunt, Leila, her grandma and Mr Wilbur find parts of an ancient treasure map and artifacts like old coins and jewelry that confirm they are on the right track. However, they also encounter a pair of shady criminal types who are after the same treasure. These bad dudes will do anything to get their hands on it and try to sabotage Leila and her crew at every turn. There's chase sequences galore with the heroes onlyjust evading the villains by the skin of their teeth. The stakes just keep getting higher as the book goes on!I don't want to give away too many spoilers, but it all builds to a thrilling climax in the grounds of Leila's grandparents' old farm where the true nature and location of the Golden Goose treasure is finally revealed after nearly 400 years of being lost. Let's just say there are underground tunnels, collapsing caverns, and a good old-fashioned race against time involved! The book also ties up the mystery of the carved goose figure and its connection to Leila's Dutch ancestor in a really cool way.Overall, 'The Goose's Gold' is a rip-roaring adventure yarn that keeps you on the edge of your seat the whole way through. The characters are all really likeable, especially the kickass grandma who is up for anything! The code-cracking and treasure hunt aspects are super fun and get you feeling like a real-life Indiana Jones. And even though it's a pretty high-octane story, there are nice quiet moments sprinkled throughout where you get to learn about the region's history and traditions.I'd highly recommend this book to anyone who loves mysteries, adventures, code-breaking... or even just meddling grandmas! It's such a unique story with lots of twists and turns. Michael Morpurgo crafts a cracking tale that will keep youhooked until the very last page. 'The Goose's Gold' is an instant children's classic as far as I'm concerned. Now if you'll excuse me, I feel an urge to go seek out some hidden treasures of my own!篇2The Goose's GoldYo, what's good fam? It's your boy coming through with the scoop on this wild chapter we just read in English class. Let me break it down for you real quick.So this story is called 'The Goose's Gold' and it's actually based on an old European folk tale. Pretty crazy to think some of these ancient stories are still getting passed down, you know? Anyway, it's set in this tiny village back in the day when people were still getting by on farming and modest lifestyles.The main character is this dude named Felix who's just a straight up peasant trying to make ends meet. From the jump, you can tell Felix is a good, hardworking guy. He's up before the sun every morning tending to his crops and livestock. But no matter how hard he grinds, he and his wife just can't seem to get ahead. They're perpetually broke, struggling to put food on the table. It's a rough scene.One day, Felix is out in the fields when this magical goose appears out of nowhere and starts dropping golden eggs all over the place! I'm talking pure 24 karat gold just falling out of this bird's behind. Crazy, right? At first, Felix can't even believe his eyes. He thinks he might be losing his marbles or something. But those eggs are 100% real deal gold.So Felix starts scooping up as many of these golden eggs as he can carry and he takes them back to show his wife. When she sees all that shimmering gold, she goes completely nuts. They're finally rich! Their money troubles are over! You can imagine how psyched they both are.From that day on, the goose just keeps on gifting Felix with these golden eggs. He basically has a never-ending supply of wealth and he doesn't have to lift a finger for it. Pretty sweet setup, if you ask me.But here's where things get twisted. Even though Felix now has more money than he could ever spend, he gets consumed by greed. He's obsessed with trying to get every last golden egg out of that goose, like some deranged lunatic. His wife keeps telling him to chill, that they have more than enough. But Felix doesn't listen.He gets it in his head that if he can just kill the goose, he'll have instant access to ALL the golden eggs inside its body. Plus, no more waiting around for it to lay them one by one. So this total moron actually tries to slaughter the goose that's providing him with infinite riches!Of course, when he slits the goose's belly, there's no pile of golden eggs waiting inside. He just killed the very thing that was making him wealthy beyond his wildest dreams. The dramatic irony is just crushing. All because he gave into his greed and impatience instead of just being grateful for his circumstances.In the end, Felix is left with nothing. No goose, no more golden eggs, no more riches. Just the hollow feeling of regret for making such a boneheaded move. Talk about an epic fail and a brutal learning experience.I think the main lesson here is to appreciate what you have and don't get too greedy or anxious trying to accelerate your good fortunes. Patience and gratitude are key. Otherwise, you might end up ruining everything like poor misguided Felix. It's a harsh truth bomb, but a valuable one for sure.That's the gist of this crazy story in a nutshell. I've got to admit, even though the premise is pretty ridiculous with the goose literally defecating gold, the underlying messageresonated with me. Greed is toxic and will mess you up if you let it consume you. Funny how an old fairytale can still pack such a powerful punch in that regard.Anyway, that's my take on 'The Goose's Gold' chapter. Shoutout to the teacher for putting us onto these classic tales. Always surprises me how much wisdom and relevance they contain, even all these centuries later. Let me know if you need any other chapter summaries broken down in篇3The Goose's Gold by Gentle Quill - A Book SummaryWhat's up, fam? I just finished reading this dope book called 'The Goose's Gold' by Gentle Quill, and I've gotta say, it's a total page-turner! Let me give you the lowdown on this epic tale.The story kicks off with our main character, Greta, a spirited young lass from a humble village. Greta's life is pretty chill until one day, her pet goose, affectionately named Sir Honks-a-Lot, starts laying solid gold eggs! Talk about hitting the jackpot, right?At first, Greta is stoked about her newfound fortune, but things take a wild turn when greedy townsfolk catch wind of the golden eggs. Suddenly, everyone's trying to get their hands onSir Honks-a-Lot and his precious cargo. Greta's once-peaceful life turns into a crazy game of keep-away as she has to outwit and outrun the gold-hungry mob.But wait, it gets even crazier! Enter the dashing Prince Edfred, who's on a quest to break a wicked curse that's been plaguing his kingdom. Somehow, the key to lifting the curse lies with Greta's golden goose eggs. Cue the madness!So now, Greta's not only fending off the grabby villagers but also has to deal with Prince Edfred's crew, who are hell-bent on snatching Sir Honks-a-Lot for their own mission. Talk about a wild goose chase, am I right?As if that's not enough drama, there's a sinister force at work, pulling the strings from the shadows. A mysterious and powerful witch has her own nefarious plans for the golden eggs, and she'll stop at nothing to get her claws on them.Greta finds herself caught in a whirlwind of intrigue, danger, and chaos, all while trying to keep her beloved feathery friend safe. With the help of her trusty best friend, Ollie, and a ragtag crew of quirky characters, she embarks on a thrilling adventure that takes her from the depths of enchanted forests to the glittering halls of royal castles.Along the way, Greta learns valuable lessons about friendship, courage, and the true meaning of wealth. She discovers that the real treasure lies not in material riches but in the bonds she shares with those closest to her.Let me tell you, this book has it all – action, suspense, humor, and even a sprinkle of romance (hello, Prince Edfred!). Quill's writing is top-notch, painting vivid worlds and unforgettable characters that'll have you laughing, gasping, and cheering from start to finish.But don't just take my word for it – grab a copy of 'The Goose's Gold' and join Greta on her wild ride. Trust me, you won't be able to put it down until the final, epic showdown where the fate of the kingdom (and Sir Honks-a-Lot) hangs in the balance.So what are you waiting for? Dive into this golden adventure and let the feathers fly! I guarantee you'll be cackling like a goose by the time you reach the end. Peace out, my bookworm buddies!。
your name in gold主要内容Gold is a chemical element with the symbol Au, derived from the Latin word "aurum," which means "shining dawn." It is a highly sought-after precious metal known for its lustrous, yellow appearance and resistance to corrosion.Here are some important points about gold:1. History: Gold has been treasured by civilizations throughout history. It has been used as currency, jewelry, and a symbol of wealth and power. The ancient Egyptians considered it the "flesh of the gods," while the Incas referred to it as the "tears of the Sun."2. Rarity and Mining: Gold is relatively rare on Earth, with only about 200,000 tons ever mined. It is found in various forms, including nuggets, veins, and alluvial deposits. Mining methods range from traditional techniques to modern industrial processes.3. Physical Properties: Gold is a dense, soft metal with a bright yellow color. It is highly malleable and ductile, meaning it can be easily shaped into intricate designs or drawn into wires. Gold is an excellent conductor of electricity and does not tarnish or corrode.4. Uses: Gold has numerous industrial, decorative, and financial applications. It is used in jewelry, electronics, dentistry, and even spacecraft.Central banks and investors also hold gold as a store of value and a hedge against inflation.5. Market: The gold market is global and highly liquid. It is traded on various exchanges, with the price influenced by factors such as supply and demand, economic conditions, geopolitical events, and investor sentiment.6. Central Banks: Many countries hold significant gold reserves as part of their official reserves. These reserves provide stability and confidence in times of economic uncertainty.7. Environmental Impact: Gold mining can have a negative impact on the environment, including habitat destruction, water pollution, and the release of toxic substances. Efforts are being made to implement responsible mining practices and promote sustainable sourcing.8. Symbolism: Gold is often associated with qualities such as wealth, luxury, and success. It also holds cultural and religious significance in many societies. The term "golden" is frequently used to describe something of the utmost value or excellence.9. Alternative Investments: In addition to physical gold, there are also investment options such as gold exchange-traded funds (ETFs), gold mining stocks, and gold futures contracts. These provide opportunities for individuals and institutions to gain exposure to the gold market without directly owning the metal.10. Gold in Popular Culture: Gold has influenced various aspects of human culture, appearing in literature, art, music, and films. It has been featured in myths and legends, representing themes such as greed, power, and eternal beauty.。
A Unified Model:Self-Assembly of Trimesic Acid on GoldYingchun Ye,Wei Sun,Yongfeng Wang,Xiang Shao,Xiaoguang Xu,Fang Cheng,Jianlong Li,*and Kai Wu*Beijing National Laboratory for Molecular Sciences,State Key Laboratory for Structural Chemistry of Unstable and Stable Species,College of Chemistry and Molecular Engineering,Peking Uni V ersity,Beijing 100871,ChinaRecei V ed:April 6,2007;In Final Form:April 17,2007Self-assembly of trimesic acid (TMA)displayed remarkable abundance over its full coverage range on gold under ultrahigh vacuum conditions.Experiments showed that previously well-reported “chicken wire”and “flower”structures were actually two special cases within its full coverage.All observed assembling structures formed hexagonal porous networks that could be well-described by a unified model in which the TMA molecules inside the half unit cells (equilateral triangles)were bound via trimeric hydrogen bonds and all half unit cells were connected to each other via dimeric hydrogen bonds.These porous networks possessed pores of 1.1(0.1nm in diameter,and the interpore distance was tunable from 1.6nm on at a step size of ∼0.93nm.Energetics analysis unveiled that the assembling structures less than one molecular layer was optimally driven by maximization of the dimeric hydrogen bonds.Trimesic acid (TMA)has three carboxyl groups (forming an angle of 120°with respect to each other)in the molecular plane of the benzyl core (Figure 1a).The carboxyl groups can form intermolecular hydrogen bonds (HBs)in either dimeric (Figure 1b)or trimeric (Figure 1c)form.TMA normally assembles into two typical porous networks,the “chicken wire”(Figure 2A and a)and the “flower”(Figure 2B and b)structures.1,2It can assemble at various substrates such as graphite,1-5Au,6-10Cu,11and Au/Si,12in liquid 2-9or ultrahigh vacuum (UHV)1,11,12environments.It can also co-assemble with other molecules to form different patterns.5,13,14Its carboxyl groups can deprotonate to coordinate metal atoms such as Cu 11,15and Fe.16,17Even more importantly,TMA can form various host -guest systems such as hydrogen-bonded cation -anion complexes with many amino acids.18Its flexible adaptability at different surfaces and abundant coordination capability make it one of the most extensively studied assembling molecules that form ordered two-dimensional monomolecular porous networks.Here we report that TMA actually forms much more assembling structures than previously reported and gives a unified model describing the whole family of its assembling structures.All experiments were carried out with a UHV system at a base pressure <6×10-11mbar.The Au(111)substrate was cleaned by successive cycles of Ar +ion sputtering and annealing at 953K.Prior to use,the TMA powder (Acros,98%in purity)was outgassed for 72h at 453K in high purity N 2.After heating overnight in UHV at 403K,TMA was then slowly deposited onto the Au(111)-(22× 3)substrate by sublimation from a Knudsen cell at 383K,during which the Au substrate was kept at room temperature (RT).All scanning tunneling microscopy(STM)images were collected at RT in constant-current mode using a Pt/Ir tip.The STM scanner was calibrated with Si(111)-(7×7).Above 0.30ML (1ML )1.34×1014TMA molecules/cm 2),TMA started to assemble into the chicken-wire structure on Au(111)-(22× 3)under UHV conditions.Its STM image and rhombus unit cell model are given in Figure 2A and a,respectively.Its half unit cell,an equilateral triangle,contains one TMA molecule in one row (Figure 3a).We term it as H TMA -1where H TMA stands for the hexagonal porous TMA network and the subscript number 1represents one row of the TMA molecule in the half unit cell.In this structure,all TMA molecules are interconnected to each other via dimeric HBs.An increase of the TMA coverage led to the appearance of the flower structure (Figure 2B and b),which we here denoted as H TMA -2because its half unit cell contains three TMA molecules in two rows (Figure 2b).The three TMA molecules inside its half unit cell are bonded by trimeric HBs,and all half unit cells are stitched to each other via dimeric HBs.Apparently,the H TMA -2structure can be envisioned as transformed from the H TMA -1structure by adding two more TMA molecules (one row)into its half unit cell.Further increase of the TMA coverage led to a novel hexagonal porous structure (Figure 2C).Its half unit cell contains six TMA molecules in three rows (Figure 2c).Hence,it is named H TMA -3.Continuous increase of the coverage resulted in a series of novel assembling structures:H TMA -4(Figure 2D and d),H TMA -5(Figure 2E and e),H TMA -6(Figure 2F and f),H TMA -7(Figure 2G and g)and H TMA -8(Figure 2H and h).Ultimately,a close-packed structure (Figure 2I and i,we name it as H TMA -∞because the half unit cell of the network would approach infinity)was produced at 1.0ML.Above 1.0ML appeared multilayered assemblies.In the close-packed structure,all TMA *Corresponding authors.E-mail:jlipku@;kaiwu@.101382007,111,10138-10141Published on Web 05/19/200710.1021/jp072726o CCC:$37.00©2007American Chemical Societymolecules were bound together by trimeric HBs.This structure was predicted previously,but hardly observed.2,7A new unit cell,also a rhombus,can be identified for this close-packed structure.This new unit cell is ∼0.93nm in size and contains only one TMA molecule (Figure 2i).All H TMA -n (n )1,2,3,...,8)structures observed in this study had a rhombus unit cell (Figure 2a -h).Periodic arrange-ments of each unit cell can generate the hexagonal porous networks (Supporting Information).The pore diameter in all networks (Table 1)was measured to be ∼1.1nm,in good agreement with previous result,1but the interpore distance changed gradually from 1.6nm (Figure 2a)to 8.2nm (Figure 2h)at a step size of ∼0.93nm,being equal to the unit cell length of the H TMA -∞structure.This is rational because the transformation from H TMA -(n -1)to H TMA -n is actually the result of one more row of the TMA molecules added in the half unit cell of the H TMA -(n -1)structure.Accordingly,the interpore distance of the H TMA -n structure,d n ,can be described bywhere p )0.93nm,the unit cell length of the H TMA -∞structure,and q )1.65nm,the unit cell length of the H TMA -1structure.n is the number of TMA rows in the half unit cell.Therefore,the experimentally observed surface molecular density of the H TMA -n structure,σn ,can then be precisely written asAll measured interpore distances and the calculated ones were in excellent agreement (see Table 1),indicating that the interpore distance can be tuned stepwise over the nanometer range (1.6-8.2nm).According to the data for our observed structures (Table 1),it is obvious that the larger the n value,the denser the surface molecular density.As such,it is expected that any intermediate assembling structure in between the two extremes,H TMA -1and H TMA -∞,can be fabricated by careful control of the TMA coverage and the whole family of the assembling structures can therefore be described mathematically.In all assemblies,there are only two types of HBs,dimeric and/or trimeric ones.The bond length in a dimer is slightly shorter than that in a trimer.1Experimentally,the H TMA -1structure always appeared first.Both facts indicate that the dimeric HB is lower in energy than the trimeric one,and hence is more stable.Supposing that (1)all TMA molecules equally interact with the Au substrate and (2)the amount of irregular molecular connections at the domain boundaries are neglectable,we can write down the coverage,θn ,for the H TMA -n structure asBecause the molecular layer at surface may consist of various assembling structures,the total coverage,θ,can then be written aswhere n is the area occupancy (in percentage)of the H TMA -nstructure in all possible assembling structures.We denote the blank surface as the H TMA -0structure for the sake of con-sistency.Consequently,the number of the dimeric hydrogen bonds per unit area,N d ,iswhere σ∞)2 3/(3p 2)≈1.34×1014TMA molecules/cm 2,the molecular density of the close-packed H TMA -∞structure.If N d in eq 5is maximized,then the energy of the network is then minimized and,hence,the system is optimized.The calculated results are shown in Figure 3.It is obvious that at a given coverage an optimized TMA assembly should only be composed of two assembling structures,that is,the H TMA -n and H TMA -(n +1)structures.For Example,in regime I (0<θ<0.63)in Figure 3only the H TMA -1structure exists with H TMA -0,the blank surface,and in regime II (0.63<θ<0.78)in Figure3Figure 1.(a)TMA molecular structure,(b)hydrogen bond in dimeric form,and (c)hydrogen bond in trimeric form.The dash circles highlight the zones of intermolecular hydrogen bonds in dimeric and trimeric forms.TABLE 1:Experimentally Measured and Theoretically Calculated Interpore Distance and Surface Molecular Density (Coverage)for the Observed TMA Assembling Structuresstructure d meas (nm)a d calc (nm)c σ(1013molecules/cm 2)dH TMA -1 1.65(5% 1.658.48(0.63)H TMA -2 2.58(4% 2.5810.4(0.78)H TMA -3 3.54(4% 3.5111.2(0.84)H TMA -4 4.47(3% 4.4411.7(0.87)H TMA -5 5.40(4% 5.3712.0(0.90)H TMA -6 6.34(4% 6.3012.2(0.91)H TMA -77.30(3%7.2312.4(0.93)H TMA -88.21(4%8.1612.5(0.93)H TMA -∞0.93(6%b13.4(1.0)aAveraged by tens of the measured interpore distances along the three 120°diagonals of the hexagonal structure and the given percentage number in each datum being its statistically standard deviation.b The unit cell vector length of the H TMA -∞structure rather than the interpore distance.c Calculated according to eq 1.d Corresponding surface mo-lecular density calculated according to eq 2and the values in parentheses being the calculated coverage in ML,assuming that the coverage for the close-packed H TMA -∞structure is 1.0ML.θn )n (n +1)/(n -1+q/p )2(3)θ)∑n )0∞n θn (4)N d )6σ∞∑n )0∞n θnn +1(5)d n )(n -1)p +q(1)σn )2 3n (n +1)/3[(n -1)p +q ]2(2)Letters J.Phys.Chem.C,Vol.111,No.28,200710139the H TMA -1structure coexists with H TMA -2.The coverage interval for the transformation from the H TMA -(n -2)+H TMA -(n -1)combination to the H TMA -n +H TMA -(n +1)combination becomes narrower as n increases.Therefore,the larger the TMA coverage,the more sensitive the assembling structure to the coverage change.As a result,with the increase of n ,two or more combinations could be observed at the surface due to local coverage fluctuation.Nonetheless,the observed assembling H TMA -n (n <8)structures in large areas were fairly stable at RT and stretched out across atomic steps without obvious structural deformation (see the Supporting Information).To summarize,we have shown that the self-assembly of trimesic acid on Au(111)-(22× 3)could be tuned by tweaking its surface coverage,leading to the variation of its interpore distance from 1.6to 8.2nm or even larger at a step size of ∼0.93nm while its pore size remained 1.1nm,and the hexagonal assembly pattern stayed.All observed assembling structures could be described by a unified model in whichallFigure 2.Coverage-induced evolution of TMA self-assembling structures on Au(111)-(22× 3)at room temperature.(A -I)STM images of the H TMA -n (n )1-8and ∞)structures.Each STM image size:16.5×16.5nm 2.The herringbone structure of the underlying Au(111)-(22× 3)substrate was clearly visible in I.(a -i)Corresponding unit cell models for the experimentally observed assembling structures in A -I.The shorter diagonal separates each unit cell into two halves.10140J.Phys.Chem.C,Vol.111,No.28,2007LettersTMA molecules inside the half unit cells are bound via trimeric hydrogen bonds and all half unit cells connect to each other through dimeric hydrogen bonds.Energetics analysis unveils that the assembling structures less than one molecular layer are optimally driven by maximization of the dimeric hydrogen bonds.This series of porous TMA networks may be used to host foreign molecules/clusters that can be further employed to devise molecular-and nanodevices and to study the coupling effect between these molecules/clusters on their physicochemical properties in a well-controlled manner.Acknowledgment.This work is jointly supported by NSFC (20125309,90206012,20433010,20573001,50521201)and NKBRSF (2006CB806102).Supporting Information Available:Unit cell models for the hexagonal porous networks,orientations of the triangular TMA molecules in the unit cell for flower structure (H TMA -2),and stability of the TMA assembling structures across atomic steps.This material is available free of charge via the Internet at .References and Notes(1)Griessl,S.;Lackinger,M.;Edelwirth,M.;Hietschold,M.;Heckl,W.M.Single Mol.2002,3,25-31.(2)Lackinger,M.;Griessl,S.;Heckl,W.A.;Hietschold,M.;Flynn,ngmuir 2005,21,4984-4988.(3)Griessl,S.J.H.;Lackinger,M.;Jamitzky, F.;Markert,T.;Hietschold,M.;Heckl,ngmuir 2004,20,9403-9407.(4)Griessl,S.J.H.;Lackinger,M.;Jamitzky, F.;Markert,T.;Hietschold,M.;Heckl,W.M.J.Phys.Chem.B 2004,108,11556-11560.(5)Lackinger,M.;Griessl,S.;Kampschulte,L.;Jamitzky,F.;Heckl,W.M.Small 2005,1,532-539.(6)Ishikawa,Y.;Ohira,A.;Sakata,M.;Hirayama,C.;Kunitake,mun.2002,2652-2653.(7)Su,G.J.;Zhang,H.M.;Wan,L.J.;Bai,C.L.;Wandlowski,T.J.Phys.Chem.B 2004,108,1931-1937.(8)Han,B.;Li,Z.;Pronkin,S.;Wandlowski,T.Can.J.Chem.2004,82,1481-1494.(9)Li,Z.;Han,B.;Wan,L.J.;Wandlowski,ngmuir 2005,21,6915-6928.(10)Yan,H.J.;Lu,J.;Wan,L.J.;Bai,C.L.J.Phys.Chem.B 2004,108,11251-11255.(11)Dmitriev,A.;Lin,N.;Weckesser,J.;Barth,J.V.;Kern,K.J.Phys.Chem.B 2002,106,6907-6912.(12)Sheerin,G.;Cafolla,A.A.Surf.Sci.2005,577,211-219.(13)Kampschulte,L.;Griessl,S.;Heckl,W.M.;Lackinger,M.J.Phys.Chem.B 2005,109,14074-14078.(14)Nath,K.G.;Ivasenko,O.;Miwa,J.A.;Dang,H.;Wuest,J.D.;Nanci,A.;Perepichka,D.F.;Rosei,F.J.Am.Chem.Soc.2006,128,4212-4213.(15)Lin,N.;Dmitriev,A.;Weckesser,J.;Barth,J.V.;Kern,K.Angew.Chem.,Int.Ed.2002,41,4779-4783.(16)Classen,T.;Fratesi,G.;Costantini,G.;Fabris,S.;Stadler,F.L.;Kim,C.;de Gironcoli,S.;Baroni,S.;Kern,K.Angew.Chem.,Int.Ed.2005,44,6142-6145.(17)Spillmann,H.;Dmitriev,A.;Lin,N.;Messina,P.;Barth,J.V.;Kern,K.J.Am.Chem.Soc.2003,125,10725-10728.(18)Herbstein,F.H.Top.Curr.Chem.1987,140,107-139.Figure 3.Calculated occupancy (in percentage)of the H TMA -n (only n )0-27being shown here)structure in all possible TMA assembling structures against the TMA coverage at surface.The coverage axis is terminated at 0.98ML above which there are still an infinite number of possible assembling structures.Note the slow occupancy oscillation between favored structures at low coverage and rapid oscillation at high coverage.H TMA -0represents the clean Au surface.Each number (n )0-8)on top of the plot indicates the correspondingly observed H TMA -n structure.The vertical dash lines mark the critical coverage points at which the first two pure assembling structures,H TMA -1and H TMA -2,appear.I and II mark the first two coverage regimes for the H TMA -0+H TMA -1combination and the H TMA -1+H TMA -2combination,respec-tively.Letters J.Phys.Chem.C,Vol.111,No.28,200710141。