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无线电发展史约前240－1590 无线通信与天然磁石——来自中国的伟大启迪作为信息传递的代表建筑——烽火台，第一次将人类带上了无线通信的发展道路，借以光和狼烟的形式，传递给不断寻求文明进步的人们。
战国末期成书的《管子》和《吕氏春秋》记载，我们的祖先在公元前两百多年就发现了具有吸引铁器这种神奇特性的石头，并把它进行加工，制成了可以指明方向的奇异勺子——司南。
1591－1776 静电——英国医生的发现16世纪末，一位拿着手术刀的英国医生吉尔伯特（威廉·吉尔伯特，Willia m Gilber t，1540～1605），对物理学产生了浓厚的兴趣，并一发不可收拾地对磁石和静电开始了研究。
他写成了名著《论磁》，并于1600年在伦敦出版。
他断言，电与磁是两种截然不同的现象，没有什么一致性。
1777－1781 电磁力学的纽带被法国工程师系上了库仑先生把一根细如发丝的线一端系在了天花板梁上，另一端则是小磁针。
他又拿来了另一个小磁棒，以及可以摩擦出静电的小电棒，在悬挂的小磁针面前轻轻地摆动。
这一摆，就摆出了扭秤，也摆出了测量静电力与磁力的实验验证方法。
浪漫的库仑难以抑制内心的激动，把发现静电力和磁力之间关系的伟大发现写在了纸上，并在1785年推导出了以他本人名字命名的著名电磁学定量定律——库仑定律。
1782－1820 电生磁的奠基人1820年7月21日，奥斯特把实验结果写成名为《论磁针的电流撞击实验》的论文，正式向学术界宣告他发现了电流磁效应。
至此，电与磁的秘密关系通过实验的方法被揭示出来。
1821－1855 磁生电的创立者——黎明前的最后一刻1833年，法拉第总结了前人与自己的大量研究成果，证实当时所知摩擦电、伏打电、电磁感应电、温差电和动物电等五种不同来源的电，其实是电家族的五个小兄弟。
人类无线通讯技术的科学发展人类已经离不开通讯技术，它是现代社会的重要基石。
随着科技的不断发展，人类的通讯技术也不断更新换代。
其中，无线通讯技术的发展一直受到广泛关注。
下面就从历史回顾，技术发展，未来前景等方面探讨人类无线通讯技术的科学发展。
一、历史回顾人类的通讯技术可以追溯到几千年前的物理信使，通过奔跑或飞鸽传书的方式传递信息。
然而，这些方式都比较缓慢，不能满足现代人的需要。
所以，人们逐渐开始探索无线通讯技术，其中最重要的里程碑是无线电。
无线电的发明被公认为是无线通讯技术的开端。
1895年，意大利物理学家马可射电报器，可以通过电磁波传输语音和信息。
这是一项非常重要的创新，极大地促进了无线通讯技术的发展。
在发明无线电的过程中，许多科学家做出了重大贡献，例如亨利、波尔、库埃特、马克思等。
无线电的成功发明推动人类探索更广泛的无线通讯领域，从而出现了无线电电话，无线电传输、卫星通讯和现代的移动通讯技术等。
二、技术发展20世纪初，通讯设备的体积和重量非常大，效率低下，而且仅在有限范围内有用。
近年来，技术的进步促使通讯设备变得更加轻便和高效。
20世纪末，数字通讯的出现彻底改变了无线通讯行业的格局。
传统的无线通讯主要是模拟信号，不能对数据进行加密和处理，安全性和稳定性较低。
而数字通讯则将信息编码为数字信号，并使用加密技术对信号进行加密，从而大大提高了通讯的安全性和稳定性。
因此，数字无线通讯成为移动通讯的主流。
3G和4G移动通讯技术的出现让移动通讯进入更加快速准确的时代。
3G以及往后的4G和4G+网络速度更快，容量更大，视频通话等一些互动性更强的功能得到了更为广泛的应用。
近年来，随着5G技术的逐步开发和推广，通讯技术将迎来一次重大的变革。
5G技术在速度、延迟、带宽、功耗和设备密度等方面有着显著的提高和优势，将为人们提供更快、更稳定、更智能、更数字化的通讯服务。
目前，各国都在全力加快5G的推广和升级，5G无疑将成为未来通讯技术的主流。
无线通信的英语作文Title: The Evolution of Wireless Communication。
Wireless communication has revolutionized the way humans interact, exchange information, and conduct business. From the early days of telegraphy to the present era of 5G networks, the journey of wireless communication has been marked by remarkable advancements and innovations.The inception of wireless communication can be traced back to the late 19th century with the invention of theradio by Guglielmo Marconi. This groundbreaking technology enabled long-distance transmission of signals without the need for physical wires. The radio laid the foundation for subsequent developments in wireless communication, serving as a precursor to modern technologies such as Wi-Fi, Bluetooth, and cellular networks.One of the most significant milestones in the historyof wireless communication was the advent of cellularnetworks. In 1973, Motorola engineer Martin Cooper made the first public call using a handheld mobile phone, marking the birth of the cellular era. Since then, cellular technology has undergone rapid evolution, transitioning from analog to digital systems and culminating in the widespread deployment of 4G LTE networks.The emergence of smartphones and other mobile devices has further propelled the demand for wireless connectivity. Today, wireless communication is not only about voice calls but also encompasses a wide range of data services, including internet browsing, video streaming, and social media interaction. The advent of 5G technology promises even faster data speeds, lower latency, and greater network capacity, paving the way for the Internet of Things (IoT) and smart cities.In addition to cellular networks, Wi-Fi has become an integral part of everyday life. Originally developed as a wireless alternative to Ethernet for local area networking, Wi-Fi has evolved into a ubiquitous technology found in homes, offices, cafes, and public spaces worldwide. Thelatest iterations of Wi-Fi, such as Wi-Fi 6, offer significant improvements in speed, efficiency, and reliability, catering to the ever-increasing demand for high-bandwidth applications.Bluetooth is another key wireless technology that enables short-range communication between devices.Initially conceived as a way to eliminate cables for connecting peripherals such as keyboards and mice, Bluetooth has evolved into a versatile protocol used for audio streaming, file sharing, and IoT connectivity. The latest version of Bluetooth, Bluetooth Low Energy (BLE), is particularly well-suited for battery-powered devices and IoT sensors.The future of wireless communication holds immense promise, driven by ongoing research and development in areas such as millimeter-wave technology, massive MIMO (Multiple Input Multiple Output), and cognitive radio. These advancements aim to address the growing demand for faster speeds, greater reliability, and ubiquitous connectivity across diverse environments.However, along with its numerous benefits, wireless communication also poses challenges such as spectrum congestion, security vulnerabilities, and privacy concerns. As the reliance on wireless technology continues to grow,it becomes increasingly important to address these issues through effective regulation, standardization, and cybersecurity measures.In conclusion, wireless communication has come a long way since its humble beginnings, transforming the world in profound ways. From the radio waves of the past to the 5G networks of the future, the evolution of wireless communication reflects humanity's relentless pursuit of connectivity and innovation. As we stand on the brink of a new era driven by emerging technologies, the possibilities for wireless communication are limitless, promising afuture where connectivity knows no boundaries.。
介绍发明家的发明英语作文Introduction。
In the history of mankind, there have been many great inventors who have made significant contributions to the advancement of human civilization. These inventors have revolutionized the way we live, work, and communicate, and their inventions have changed the world in countless ways. In this essay, we will introduce some of the most famous inventors and their inventions.Thomas Edison。
Thomas Edison was an American inventor and businessman who is best known for his development of the electric light bulb. Edison was born in 1847 in Ohio and was homeschooled by his mother. He began working as a telegraph operator at the age of 15 and later established his own laboratory in Menlo Park, New Jersey.Edison's most famous invention is the incandescentlight bulb, which he patented in 1879. This invention revolutionized the world by providing a reliable and efficient source of light. Edison also developed the phonograph, the motion picture camera, and the alkaline storage battery, among many other inventions.Alexander Graham Bell。
你知道哪些科学家英语作文1. Albert Einstein, a German-born physicist, is best known for his theory of relativity and the equation E=mc^2. He was awarded the Nobel Prize in Physics in 1921 for his explanation of the photoelectric effect.2. Marie Curie, a Polish-born physicist and chemist,was the first woman to win a Nobel Prize and the onlyperson to win Nobel Prizes in two different scientific fields. She discovered the elements polonium and radium,and her pioneering research on radioactivity laid the foundation for the development of X-ray machines.3. Charles Darwin, an English naturalist, is famous for his theory of evolution by natural selection, whichexplains how species evolve over time. His book "On the Origin of Species" revolutionized the way we understand the diversity of life on Earth.4. Isaac Newton, an English mathematician and physicist,is best known for his laws of motion and universal gravitation. His work laid the groundwork for classical mechanics and greatly influenced the scientific revolution of the 17th century.5. Stephen Hawking, a British theoretical physicist, made significant contributions to the study of black holes and the nature of the universe. Despite being diagnosed with a motor neuron disease at a young age, he continued to work and communicate his ideas through his bestselling book "A Brief History of Time."6. Rosalind Franklin, an English chemist and X-ray crystallographer, made critical contributions to the understanding of the molecular structures of DNA, RNA, viruses, coal, and graphite. Her work was instrumental in the discovery of the DNA double helix structure.7. Nikola Tesla, a Serbian-American inventor and electrical engineer, is best known for his contributions to the development of alternating current (AC) electrical systems. He also made significant advancements in wirelesscommunication and electric power transmission.8. Jane Goodall, a British primatologist and anthropologist, is renowned for her groundbreaking research on the behavior of wild chimpanzees in Tanzania. Her work has greatly expanded our understanding of primate behavior and the conservation of endangered species.9. Galileo Galilei, an Italian astronomer, physicist, and engineer, played a major role in the scientific revolution of the 17th century. He made significant discoveries in the fields of astronomy, physics, and mathematics, and his support for heliocentrism challenged the prevailing view of the universe.10. Ada Lovelace, an English mathematician and writer, is considered the world's first computer programmer for her work on Charles Babbage's early mechanical general-purpose computer, the Analytical Engine. Her notes on the engine include what is now considered the first algorithm intended to be processed by a machine.。
南京邮电大学研究生专业英语翻译刘旭老师2017年第一学期注：译文仅供参考Reading 2(1)Wireless communication, despite the hype of the popular press, is a field that has been around for over a hundred years, starting around 1897 with Marconi’s successful demonstrations of wireless telegraphy. By 1901, radio reception across the Atlantic Ocean had been established; thus rapid progress in technology has also been around for quite a while.尽管受到大众媒体的炒作，从大约1897年马可尼无线电报成功示范开始，无线通信是一个已经存在一百多年的领域。
到1901年，横跨大西洋的无线电接收已经被建立；因此，技术的快速发展也已经有一段时间了。
(2)In the intervening hundred years, many types of wireless systems have flourished, and often later disappeared. For example, television transmission, in its early days, was broadcast by wireless radio transmitters, which is increasingly being replaced by cable transmission. Similarly, the point to point microwave circuits that formed the backbone of the telephone network are being replaced by optical fiber.在这一百年的时间里，许多类型的无线系统已经蓬勃发展，并且后来又消失了。
