贝茨理论的推导

四大理论构建了现代金融市场理论体系基础： 1、风险－收益理论 2、有效市场理论 3、资本结构理论 4、期权理论
一、风险－收益理论
在金融市场中，几乎所有的金融资产都是风险 资产。理性的投资者追求同等风险水平下的收 益最大化，或是同等收益水平下的风险最小化。
投资组合理论（分散风险） 资产定价理论（如何确定资产价格）
此后，金融学者开展了大量的后续研究，对BS期 权定价模型的适用条件做了更为完善的补充和修 正。
默顿 （美国）
斯科尔斯 （美国）
1997——默顿、斯科尔斯——期权定价理论
罗伯特·默顿（Robert C. Merton，USA，Harvard University，Cambridge， MA， USAx, Ingersoll & Ross, 1985a) 对连续时间跨期完全竞争经济进 行了完备描述，提出了连续时间生产经济下的 广义均衡理论。CIR (1985b) 限定某些特殊条 件，提出了利率期限结构的一般均衡模型。
赫尔和怀特(Hull & White, 1987) 使用了随机波 动模型 (SV模型)。
史密斯 （美国）
卡尼曼 （美国·以色列）
2002——史密斯、卡尼曼——实验经济学和经济心理学
弗农•史密斯：美国人（1927— ）弗吉尼亚州乔治•梅森大学经济学和法学 教授
丹尼尔•卡尼曼：以色列人，美国和以色列双重国籍（1943—），普林斯顿 大学公共事务教授
学术贡献：两位教授设计了能够解释为何人们会在理论上“合理”市场上做 出一些不合理的经济选择的实验而分享2002年诺贝尔经济学奖。
夏普 (W. Sharp) 在马克维茨对有价证券收益与风险 的数学化处理的基础上提出马克维茨模型的简化方 法。同时，他与莫辛 (Mossin) 和林特勒 （ Lintner) 一起提出了资本资产定价模型 (简称CAPM)。

贝茨视力训练恢复法
1885年由美国眼科医生贝茨发明，通过调节眼球晶状体 改变形状来完成的。
根据贝茨的理论，一切屈光不正（近视、远视和散光）的 原因，只不过是“不正常的精神状态”所引起的“紧张”。 而眼睛不能消除这种紧张，反而妨碍了视力的矫正，紧张 状态使眼睛越来越坏，眼镜的度数也越来越深。
贝茨视力训练恢复法就是再次纠正你的视力的方法。使视 力器官通过训练不断调整自身机制，从而达到和纠正甚至 根治近视和视力问题的方法
精品课件
精品课件
佛家、道家等宗教大师和右脑开发教育专家等 则通过静心、冥想、打坐等科学训练的方法激活松 果体退化性后，可以捕捉到连肉眼也看不见的光， 不用通过视觉神经传导也可直接 表的七田式右脑开发训练，在韩国有以韩国脑科学 研究院院长李承宪博士为首的脑呼吸集中力训练…， 这些开创性的训练都取得了可喜的成果，培养出许 许多多具有间脑与右脑五感能力（透视能力、心灵 感应、触知能力、预知能力、意念动力）的人群和 波动速读照相记忆过目不忘的人群。
精品课件
方法
1、手掌按摩法：闭眼，将手掌覆盖住双眼，完全阻挡光线，让眼 睛感到温暖、舒适的感觉，保持五分钟；每日三到五次。
2、尺子游戏：近视从15厘米的短尺开始，竖放；逐步加长最后达 到使用米尺。远视则相反。将尺子边缘向上放置在两眼之间，尺子 一边架在鼻梁上，另一边抵住额头下方。捏住尺子下缘使尺子成一 直线，刻度与眼睛垂直。这时如果将目光聚焦远处，尺子产生的二 重影像看起来像一条隧道的两条边，且两条边缘同样清晰。将视线 收回，这时隧道的边缘开始交叉相遇。往复看，每次三到五分钟。
手掌按摩法
用手掌按摩眼部周围 动作: 1.轻轻闭上眼睛，手掌覆盖到眼睛上，阻挡光线 和压力; 2.手掌在颧骨上，手指在额头上，注意保持鼻子 的呼吸畅通 时间: 保持4-5分钟 重复: 每天3-5次 要点: 保持宁静

风力发电机风轮系统2.1.1 风力机空气动力学的基本概念1、风力机空气动力学的几何定义（1）翼型的几何参数翼型翼型本是来自航空动力学的名词，是机翼剖面的形状，风力机的叶片都是采用机翼或类似机翼的翼型，与翼型上表面和下表面距离相等的曲线称为中弧线。

下面是翼型的几何参数图1）前缘、后缘翼型中弧线的最前点称为翼型的前缘，最后点称为翼型的后缘。

2）弦线、弦长连接前缘与后缘的直线称为弦线；其长度称为弦长，用c表示。

弦长是很重要的数据，翼型上的所有尺寸数据都是弦长的相对值。

3）最大弯度、最大弯度位置中弧线在y坐标最大值称为最大弯度，用f表示，简称弯度；最大弯度点的x坐标称为最大弯度位置，用x f表示。

4）最大厚度、最大厚度位置上下翼面在y坐标上的最大距离称为翼型的最大厚度，简称厚度，用t表示；最大厚度点的x坐标称为最大厚度位置，用x t表示。

5）前缘半径翼型前缘为一圆弧，该圆弧半径称为前缘半径，用r1表示。

6）后缘角翼型后缘上下两弧线切线的夹角称为后缘角，用τ表示。

7）中弧线翼型内切圆圆心的连线。

对称翼型的中弧线与翼弦重合。

8）上翼面凸出的翼型表面。

9）下翼面平缓的翼型表面。

（2）风轮的几何参数1）风力发电机的扫风面积风轮旋转扫过的面积在垂直于风向的投影面积是风力机截留风能的面积，称为风力机的扫掠面积，下图是一个三叶片水平轴风力机的扫掠面积示意图。

下图是一个四叶片的H型升力垂直轴风力发电机的扫掠面积示意图。

根据前面两表可由所需发电功率估算出风力机所需的扫风面积，例如200W的升力型垂直轴风力发电机工作风速为6m/s，全效率按25%计算所需扫风面积约为6.2m2,如果工作风速为10m/s则所需扫风面积约为1.4m2即可；例如10kW的升力型垂直轴风力发电机工作风速为10m/s，全效率按30%计算所需扫风面积约为56m2,如果工作风速为13m/s则所需扫风面积约为25m2即可。

按高风速设计的风力机体积小成本相对低些，但必须用在高风速环境，例如把一台设计风速为10m/s的风力机放在风速为6m/s的环境工作，其功率会下降80%；按风速6m/s设计的风力机风轮会很大，虽在6m/s时运行很好，但遇大风易超速损坏电机，为抗强风时需增加结构强度使成本大大增加。

1.“冰山理论”（iceberg theory）：one eighth of an iceberg is above the water. All of the rest is underneath the water.2.The Iceberg Theory (also known as the "theory of omission") is a term used to describe the writing style of American writer Ernest Hemingway (July 21, 1899 – July 2, 1961).Ernest Hemingway’s “iceberg theory” suggests that the writer include in the text only a small portion of what he knows, leaving about ninety percent of the content a mystery that grows beneath the surface of the writing. This type of writing lends itself naturally to a version of dream-interpretation. If a writer of prose knows enough about what he is writing about he may omit things that will have a feeling of those things as strongly as though the writer had stated them. The dignity of movement of an iceberg is due to only one-eighth of it being above water. A good writer does not need to reveal every detail of a character or action.3.The Iceberg Theory is a writing theory stated by American writer Ernest Hemingway as follows: "If a writer of prose knows enough about what he is writing about he may omit things that will have a feeling of those things as strongly as though the writer had stated them. The dignity of movement of an iceberg is due to only one-eighth of it being above water. A good writer does not need to reveal every detail of a character or action." This statement throws light on the symbolic implications of art. He makes use of physical action to provide an interpretation of the nature of man's existence. It can be convincingly proved that, 'while representing human life through fictional forms, he has consistently set man against the background of his world and universe to examine the human situation from various points of view'.4.iceberg principleThe iceberg principle is a writing theory stated by a famous American writer, Ernest Hemingway, as follows: If a writer of prose knows enough about what he is writing about he may omit things that will have a feeling of those things as strongly as though the writer had stated them. The dignity of movement of an iceberg is due to only one-eighth of it being above water. A good writer does not need to reveal every detail of a character or action.Now this principle has been applied in various fields. We could regard the small part which can be easily noticed as the 1/8 of an iceberg, and the part can’t be easily noticed as the part under the surface. What can’t be seen is the most important, because it’s the base of an iceberg, what it to the part above water is what the root of a tree to the trunk. We may admire a famous person very much because of his wealth and fame, but how many people know the struggle and sufferings behind it? Are they dispensable? We can use the model of “iceberg principle”. His wealth and fame is the small part we can see, and his sufferings and struggle is the part under water, without it, the person wouldn’t have acquired the fame and wealth he owns today.This principle also could be used in teaching. The amount of material that teachers could present to their students is a small portion of the sum total of knowledge and skills that they possess. Like an iceberg, the level of expertise that is visible to the public is dependent upon a larger body of knowledge that is submerged out of sight. So, it is particularly important for instructors to continually increase their knowledge and skill level because only a portion of the total body ofknowledge will appear to be available; the same goes to learning. What the teacher could teach us is very limited, so if we want enrich our knowledge; we have to learn to use what we have learned to explore the unknown things.5.What do you know about Hemingway’s iceberg theory of writing?Hemingway and his "tip of the principle of"20 to 30 years in the prevalence of this century on behalf of the "Lost Generation" on behalf of recognized literary genre known as the United States is the writer of the twentieth century the first half of the most talented novelist Ernest genius. Hemingway. If one sentence summed up his people, and that is: a love of sports and sports a tough guy; A sophisticated reporter world; all the scars of a fighter; a Spanish bullfight fan; not only a good drink Also pay attention to the spirits of life gourmet. Hemingway's thinking is very deep and unique perspective, the poet Allen? Tate as saying that he had "an extremely delicate heart and a strong selective observation capacity." He Aoqi Te in the art of deep thinking, "the tip of the principle of" can be described as the most representative and most well-known.In 1932, Ernest Hemingway in his works of documentary "Death in the afternoon", the first time literature than done floating in the ocean on the tip, he said: "the tip of the movement's magnificent, because he was only eighth in the On the surface of the water. "Since then, many have made such an analogy. This image of Hemingway analogy, literary criticism aroused interest in the sector. As a result, the so-called "tip of the principle of" literary criticism has become involved in the study of Hemingway created one of the important issues. It can be said that "the tip of the principle of" Hemingway was on his many years of experience summed up the image, he is dealing with the relationship between art and life followed by the basic norms.In that case, what is "the tip of the principle of"?In this regard, Western critics carried out a great deal to explore. Let us take a look at how they are understandable. American Academy of Arts Critics pointed out that the horse Cosme: "Y ou extracted from the life of those who arouse feelings of their own distinctive details, if you are not on the terrorist atrocities and out of touch with reality, and in accordance with the proper order to accurately describe the details, then Y ou write will still arouse the reader's emotional things to come. This is the Ernest Hemingway in his early close-up followed in the method of its own to limit the scope is very successful. Even in its scope, he is also Successful, as he described the picture show with a wide range of implied power. "Betts Speaking on British critics of the Hemingway short story, said:" The master of the art implies, that a word or two for more than two different The Art of the matter, then the short story house to do the work completed more than half. "Elder critic of the United States of Hemingway's" tip of the principle of "negative, he thought it was" evasive tactics, "" A way to create a mood of emotional atmosphere. "The community started to criticize the various ways that can help us understand the "tip of the principle". However, if further from the aesthetics and poetics of "the tip of the principle of"in-depth understanding, it is clear that each of Appeal on is not enough.The "tip of the principle of" Hemingway in his "Death in the afternoon," there is an explanation, he wrote: "If he wanted to write an essayist for the very few things in mind, he knows he may omit things, so readers As long as the writers write the true will of the strong feeling that he had omitted, the author seems to write out like. "Obviously, to emphasize here that the writer is omitted, Shui Mianxia advocate of the" seven eighths "should be left to The reader to feel. According to the interpretation of Hemingway, the "tip of the principle of" a rough generalization: the so-called "tip of the principle", is to use simple language to shape a distinctive image of their own feelings and ideas, emotions and buried it in the image of the maximum, So that it is full of emotion hidden, and deep thinking of the night and not hidden, so that literature can be emotional and can be thought of a clever combination of clear-cut image for readers to discover the feelings of the ideological significance of the work.Concise text, the image of the distinctive, rich and deep emotional thinking is a "tip of the principle of" the four basic elements. Specifically, text and image is the so-called "eighth" and feelings and ideas is the so-called "seven eighths." The first two concrete is visible, the latter two are among resides in the first two. To shape the image of the text, contains the image of emotion, and emotion among the implication of thinking. It is true that literature in general, these four elements are essential, but in Hemingway's work is particularly prominent because he emphasized the feelings and ideas of implicit.Hemingway's study of "the tip of the principle of" first of all to find out the underwater "seven eighths" because this is part of the iceberg. If Elder's view of the substantive content of Hemingway's works was the author of "apparent pursuit of surface effect" to avoid the drop, then a sharp rise, the problem can not be avoided, that is what Hemingway is a certain depth of thinking big Writers, or shallow, limited to the word of Mo Liu literary skills? It is clear that the substantive content of Hemingway's works were not avoiding the drop, but Elder did not see it.海明威与他的“冰山原则”1932年，海明威在他的纪实性作品《午后之死》中，第一次把文学创作比做漂浮在大洋上的冰山，他说：“冰山运动之雄伟壮观，是因为他只有八分之一在水面上。