What are Qian Xuesen s representative works? What are Qian Xuesen s books What books did Qian Xuesen

The problem of mechanics in agriculture - the yield of 10,000 catties per mu is not a problem.

Knowledge is Power, No. 5, 1959.

Over the past few years, under the glorious light of the general line of party building, the Chinese people have been in high spirits and full of spirit, and have made great achievements on both the industrial front and the agricultural front. Especially since the Great Leap Forward in 1958, production has increased many times on the same equipment conditions and land. As a result of this leap in production, a series of new scientific and technological problems have emerged, which require scientists to solve. One of the issues I would like to raise here is the mechanics of agricultural high-yield technology.

We all know that mechanics deals with mechanical design, high-speed aircraft design, and water and gas flows. To illustrate this, we must first calculate how much sunlight falls on each acre of land in a year at the average latitude of our country. This energy can be expressed in various units.

We use the number of pounds of carbohydrates produced from water and carbon dioxide to calculate this because it is the water and carbon dioxide that plants grow from water and carbon dioxide to make carbohydrates such as starch and fiber. We calculated that the sunlight that falls on one acre of land in a year is equivalent to about 940,000 catties of carbohydrates. If the efficiency of plants in using sunlight is really 100%, then the annual output of dry matter per unit area should be this number, 940,000 catties!

Naturally, the efficiency of the leaves of higher plants in using sunlight cannot be 100 percent, and it is estimated that the maximum is only 1 6, that is, the annual output of dry matter per unit area is about 10,000 catties. However, the material accumulated in plant growth is only a part of the grain, and the weight of grains of crops such as rice and wheat accounts for about half of the weight, so according to this calculation, the annual output of grain per unit area should be 10,000 catties. This means that 365 days a year are sunny.

If 25% is lost because of cloudy weather, then the yield per mu of grain should be 10,000 catties. This means that crops should grow throughout the year, and if they only grow in the warm season, they may have to be discounted by another 2 3, then the average yield per mu is 10,000 catties.

The same calculations can also be used to estimate the number of fast-yielding trees. What is equivalent to grain here is the amount of timber stored, that is, the weight of accumulated timber per acre of land per year. If it is an evergreen tree, it grows all year round, and the accumulated timber weight per acre is 10,000 catties; If it's a deciduous tree, it's 10,000 catties.

If the wood is lightweight, the weight is calculated at 900 catties per cubic meter. Then evergreen trees, which grow all year round, can accumulate 63 cubic meters of wood per mu per year, while deciduous trees can accumulate 43 cubic meters of wood per mu per year.

Lectures on Physical Mechanics, Introduction to Interstellar Navigation, On Systems Engineering, etc.

1. Qian Xuesen's works include "Engineering Cybernetics", "Lecture Notes on Physical Mechanics", "Introduction to Interstellar Navigation", "On Systems Engineering", "On the Science of Thinking", "On Geographical Science", "The Art of Science and the Science of Art", "On Human Science and Modern Technology", "Creation Systematics", "On Macro Architecture and Micro Architecture", and "On the Sixth Industrial Revolution Correspondence".

2, Qian Xuesen (, Han nationality, the 33rd grandson of King Qian of Wuyue, born in Shanghai, ancestral home in Lin'an, Hangzhou City, Zhejiang Province. World-famous scientist, aerodynamicist, founder of China's manned spaceflight, academician of the Chinese Academy of Sciences and the Chinese Academy of Engineering, winner of China's two bombs and one star meritorious service medal, known as the "father of China's aerospace", "father of China's missile", "father of China's automation control" and "king of rockets", due to Qian Xuesen's return to China, China's missile and atomic bomb launches have been pushed forward for at least 20 years.

Engineering Cybernetics", Chi Meng, Lecture Notes on Physical Mechanics, Introduction to Interstellar Navigation, On Systems Engineering, On Geographical Sciences.

1. Engineering Cybernetics

Engineering Cybernetics is an English book written by Chinese scientist Qian Xuesen (TSIEN, 1954) and published by McGraw-Hill in the United States; It was later translated into Chinese Simplified Chinese and published by Science Press.

Qian Xuesen was the first to extend cybernetics to the field of engineering technology in "Engineering Cybernetics", which is a classic work of cybernetics, with German and Russian translations. This book won the first prize of the Chinese Academy of Sciences in 1956.

2. Lectures on Physical Mechanics

At the California Institute of Technology, Qian Xuesen opened a course on "Physical Mechanics" and wrote lecture notes on "Physical Mechanics". It was not until Qian Xuesen returned to China that this work was officially published by Science Press in February 1962 and named "Lecture Notes on Physical Mechanics".

3. Introduction to Interstellar Navigation

Introduction to Interstellar Navigation" comprehensively introduces the complexity and arduousness of interstellar navigation technology and interstellar navigation practice, and plays a good guiding role for engineering and technical personnel and researchers who are about to devote themselves to aerospace at that time.

Mr. Qian Xuesen's future development trend of rocket technology in the book, such as heat-resistant materials for spacecraft and lightweight, has been confirmed in practice. The scientific principles and technical methods expounded by it are still of great practical significance to the development of China's space technology and human exploration of space.

4. On Systems Engineering

On Systems Engineering is a book published by Shanghai Jiao Tong University Press in 2007, and the author is Qian Xuesen. This book records Qian Xuesen's ideas on systems engineering, and also collects some related ideas from other scholars.

5. On Geographical Sciences

In 1986, Qian Xuesen put forward the concept of "geographical science" on the basis of the earth's surface science, which is different from the original geography in that geography is limited by natural science and social science, and divides itself into physical geography and economic geography, and geographical science is the bridge science between natural science and social science.

Geographical science is also different from earth science in that earth science is a natural science, and geographical science is not subordinate to earth science, but a cross-border science independent of natural science and social science of earth science.

1. Qian Xuesen's works include "Engineering Cybernetics", "Lecture Notes on the Disadvantages and Mechanics of Physical Travel", "Introduction to Interstellar Navigation", "On Systems Engineering", "On the Science of Thinking", "On Geographical Science", "The Art of Science and the Science of Art", "On Human Science and Modern Science and Technology", "Creation Systematics", "On Macro Architecture and Micro Architecture", and "On the Sixth Industrial Revolution Correspondence".

2. Qian Xuesen (, Han nationality, the 33rd grandson of Qian Biao, King of Wuyue, born in Shanghai, ancestral home in Lin'an, Hangzhou City, Zhejiang Province. A world-famous scientist, aerodynamicist, the founder of China's manned spaceflight, an academician of the Chinese Academy of Sciences and the Chinese Academy of Engineering, a winner of China's two bombs and one star meritorious service medal, known as the "father of China's aerospace", "the father of China's missiles", "the father of China's automation control" and "the king of rockets".