In daily life or work and study, everyone is most familiar with composition. A good essay generally has the characteristics of literary talent. Do you know how to write an article? The following are eight essays on the theme activities of the Universiade, which I collected and sorted out. Welcome to share.
Eight essays 1 1592 on the theme of "Building a Dream Universiade with the Future", and Galileo, a famous Italian biologist, successfully manufactured the first thermometer. It is a straight and slender glass tube with scale, one end of which is closed in a spherical shape and the other end is not closed in water. When the ambient temperature changes, the water column in the pipeline also changes, so the temperature can be known. However, because water is exposed to the atmosphere. The fluctuation of water column is not only affected by temperature, but also by atmospheric pressure, so it is often inaccurate to measure the temperature change only by the height of water column. In order to solve this problem, 1654, Galileo's students used alcohol instead of water to make a thermometer that was not affected by atmospheric pressure, and it was first used by Italian medical professor San Sorio to measure human body temperature. About 10 years later, Italian Akde Mia made another thermometer with mercury instead of alcohol. Since then, this thermometer has been widely used in clinical diagnosis. Although mercury thermometer is widely used in clinic, people find it has many inconveniences. Therefore, 1867, a doctor named Albat in London, England, developed a thermometer specially used for measuring human or animal body temperature according to the characteristics and needs of measuring human body temperature. At this point, the thermometer was officially born and has been used ever since.
Of course, with the development of modern science and technology, thermometers are constantly innovating. 1984, a Finnish medical device designer invented a more convenient and accurate electronic thermometer. Soon after, an American medical device company invented and developed a nipple thermometer specially for babies. It can be predicted that a more advanced, scientific and accurate new thermometer will be developed tomorrow with the rapid development of high technology.
China is the first country in the world to pay attention to keeping oral cavity clean and preventing dental diseases. According to Oracle Bone Inscriptions's records unearthed from Yin Ruins in Anyang, Henan Province, as far back as the 3rd century BC/kloc-0, the ancients recorded oral diseases in detail. However, due to the level of people's understanding at that time, the cause of dental diseases was attributed to the role of ghosts and gods, and it was natural that brushing teeth would not be thought of to prevent dental diseases.
After entering the feudal society, some doctors clearly pointed out that people suffering from wind and not gargling after eating were the causes of dental caries. So from 20xx years ago, some people in China had the habit of gargling. For example, in the Book of Rites, there is a record that "when a chicken crows at first, she gargles". However, gargling alone cannot completely remove dirt and food residue from teeth. So the ancients came up with the idea of cleaning teeth with fingers or willow branches.
Among the Dunhuang frescoes, there is a sacred picture of the fork head of Fandu, which shows a monk squatting on the ground to clean his teeth, holding a mouthwash bottle in his left hand and wiping his front teeth with his middle finger in his right hand. This shows that at least in the Tang Dynasty, Chinese people had the hygienic habit of wiping their teeth. Brushing with willow branches is the pioneer of brushing with a toothbrush. In the Tang dynasty, people used their teeth to bite one end of willow branches into a brush shape, and then dipped them in medicine to wipe their teeth. In the Song Dynasty, it was advocated that you should brush your teeth at least twice a day, once in the morning and once in the evening. Archaeological findings show that there were two rows of 8-hole hair-transplanted toothbrushes in the ancient tombs of Liao Dynasty, which lasted for nine years, that is, in 959 AD, indicating that oral hygiene in China was very advanced at that time. This kind of toothbrush was first discovered in China, at least 60,000 years earlier than that in Europe.
1490, the cleaning surface of toothbrush made in China is perpendicular to the brush handle, and it is made of hair cut from the shoulder blades of Siberian wild boar and implanted with bamboo handles. At that time, Europe was still in the stage of wiping teeth with fingers or linen pumice powder. It can be seen that the technology of making toothbrushes in China was very developed in the world at that time. It was not until the Qing Dynasty that a French missionary came to China and was surprised to see China's toothbrush, and brought the samples and manufacturing technology back to Europe.
Building a Dream with the Future: Eight Essays on Theme Activities of Universiade 3. Cultivate scientific spirit, starting from primary education; Education should start with teaching materials;
Studying Chairman Mao's Long March poem in the summer vacation, the Red Army is not afraid of the expedition, and Qianshan has only leisure. Wuling makes waves, and Wumeng takes mud pills. Jinsha River is warm in the clouds and cliffs, and Dadu Bridge is cold with the cross rail. I am glad to see that Minshan Mountain is covered with snow and stretches for miles. Our soldiers crossed it and showed a bright smile. Very experienced!
Chairman Mao's Long March poem is full of spirit, strength and momentum. Chairman Mao's heroism was very popular in ancient times!
The great feat of the Red Army's 25,000-mile Li Long Long March. Their extraordinary perseverance and spirit are tragic. What supported them to finish the Long March? Relying on the lofty spirit of seeking happiness for the people of China, the spirit shown by the Chinese Red Army is a valuable spiritual wealth and the soul of a nation!
Now that we are living in the peaceful times they created for us, why don't we study hard? Is there any reason not to cherish today's beautiful life? Let's apply the Long March spirit to our study and life and strive for the strength of our motherland.
There are always many small things in our life, which seem ordinary, but we can always find many beautiful things, full of leisure.
When I was a child, I always liked eating ice cream. I ate it for several days in summer, and I felt very cool after eating it every time. Occasionally, I just want to eat ice cream, and the package has not been opened. At this time, my mother asked me to do something, so I left it on the table and forgot. After a while, "ouch! I forgot to eat my ice cream! " It suddenly occurred to me that I rushed to the table and grabbed the ice cream-unexpectedly, there was a pool of "unknown liquid" on the table. I thought, is the packaging bag leaking? No way! There is no crack in the bag in my hand So I have to ask my father with questions. Later, I learned that ice cream is made of ice and the air is hot, so when they meet, the water vapor in the air turns into water when it is cold, which is the "unknown liquid" on the table!
After primary school, I have more and more knowledge and more problems. My father asked me to try to find the answer by myself. One day at school, it was foggy outside, and my mother asked me to wear a mask to go out. I've been thinking on the road-how did the fog come from? Why are you wearing a mask in the fog? So this question bothered me for a long time, and I didn't understand it until I learned physics in junior high school. Fog is actually caused by water vapor. Water vapor in the air becomes tiny water droplets when it is cold, because it is too light to float in the air. There will naturally be a lot of dust and bacteria in the air, so of course you should wear a mask in foggy days!
Now that I have studied physics and biology, I know more about artificial rainfall and compare it with the experiment. I admire Newton for discovering gravity when he was accidentally hit by an apple. I admire Beethoven's deafness, and he can continue to compose music with bone conduction sound. I admire Edison for successfully inventing the light bulb after 1000 failures. ...
What are all these? This is the scientific spirit-innovation, persistence and exploration. Only by being brave in innovation and exploration, regardless of other people's opinions and neglect, can we discover what others have not discovered and create what others have not created. Maybe a lot of unknown things are like a new continent, which has always existed but is just waiting for us to discover. We must keep going, even if it is a hundred times and a thousand times, we will succeed once!
With the development of economy, the improvement of people's living standards and the progress of science and technology, batteries have penetrated into every corner of our work, study and life, such as calculators, alarm clocks, electric mosquito swatter, flashlights, Mp3 players and mobile phones. Consumption is increasing, and output is also increasing-at present, there are more than 1400 enterprises producing batteries in China, and the annual output of batteries is about1400 million knots; However, it is understood that the recovery rate of batteries in China is less than 2%. Therefore, strengthening the recovery, management and development of waste batteries has become one of the serious problems before us.
It is said that batteries have a very long history. The oldest battery in the world originated about 200 years ago. This kind of battery is called "Baghdad battery" and is still preserved in the museum of the Iraqi capital.
179 1 year, Italian physicist Fani found that muscle contraction occurs when all metal pieces contact frog muscles. He mistakenly thought that it was caused by the animal current generated by frog muscles. 1800 Italian physicist Volt invented the Volt battery. He uses the potential difference between different metal sheets as current. Volt battery can be said to be the origin of modern batteries, and then battery science and battery foundation were established through the efforts of scientists such as David and Faraday.
Building a Dream with the Future Universiade Theme Activity Essay 8 Six lamps are a great invention for human beings to conquer the night. 19th century ago, people used oil lamps and candles for lighting, which broke through the night, but still failed to completely liberate mankind from the restriction of the night. Only with the birth of the generator can we light up the world with all kinds of electric lights, turn night into day, expand the scope of human activities, win more time and create wealth for society.
It was the American inventor Edison who really invented the electric light to make it shine. He is the child of a railway worker. He dropped out of school before finishing primary school and made a living by selling newspapers on the train. Edison is an extremely diligent man. He likes to do all kinds of experiments and make many exquisite machines. He is particularly interested in electrical appliances. Ever since Faraday invented the electric motor, Edison was determined to make electric lights and bring light to mankind.
Edison made a detailed test plan after carefully summarizing the previous failure experience in manufacturing electric lamps, and conducted experiments in two aspects: one was to classify and test more than 600 different heat-resistant materials of/kloc-0; The second is to improve the vacuum pumping equipment to make the bulb have a high vacuum degree. He also studied the new generator and circuit shunt system.
Edison tested more than 1600 kinds of heat-resistant luminescent materials one by one, but platinum wire has good linear energy, but platinum is surprisingly expensive, so we must find a more suitable material to replace it. 1879, Edison finally decided to use carbon filament after many experiments. He sprinkled carbon powder on a piece of cotton silk, bent it into a horseshoe shape, heated it in a crucible, made it into a filament, put it in a bulb, and then pumped the air out of the bulb with an air extractor. It can be used continuously for 45 hours when the light is on. In this way, the first batch of carbon filament incandescent lamps in the world came out. 1879 On New Year's Eve, Lopark Street where Edison Electric Company is located is brightly lit.
In order to develop electric light, Edison often worked in the laboratory for more than ten hours a day, and sometimes experimented for several days. After he invented carbon fiber, he experimented with more than 6000 kinds of plant fibers. Finally, he chose bamboo filaments, burned them in a high-temperature closed furnace, and then processed them to obtain carbonized bamboo filaments, which were put into the light bulb, thus improving the vacuum degree of the light bulb again, and the light bulb could be continuously lit for 1200 hours. The invention of electric light once caused natural gas stocks to plummet 12% in three days.
After Edison, 1909, American Ke Renqi invented tungsten wire instead of carbon wire, which greatly improved the efficiency of electric lamp. Since then, electric lights have leapt to a new level, and fluorescent lamps, iodine tungsten lamp and other lights have mushroomed on the lighting stage.
Lights turn darkness into light and make the world more dazzling and colorful.
Eight essays on the theme activities of the Universiade in the same direction 7 think that geometry was summed up by Egyptians from practical experience, and its original meaning in Greek is "geodesy". At that time, the Nile River flooded all over Egypt every year, destroying the land boundary. After the water receded, people had to re-measure and distribute the land, and geometry germinated and grew in this measurement year after year. From the 7th century BC to the 6th century BC, Thales, one of the Greek sages, founded Greek geometry. Thales traveled many times when he was young. After living in Egypt for a period of time, he carefully studied Egyptian mathematics and founded geometry on the basis of geodesy. Ju said that if he didn't climb the pyramids there, he figured out that pyramid of khufu was 1, 3 1 m high, which shocked the local priests and won the appreciation of the Egyptian king. His calculation is based on the nature of similar triangles. When Thales returned to his hometown of Miletus, he set up a school to teach him mathematics and other scientific knowledge. After Thales, many mathematicians and philosophers in Greece revised, supplemented and developed geometry.
In 330 BC, Euclid was born in Athens. He was a student of Plato, then a professor of mathematics at the University of Alexandria, and established a school of mathematics headed by him. He transformed the earth and heaven into a huge pattern composed of intricate figures, and took the pattern apart with amazing wisdom and decomposed it into simple components: points, lines, angles, curves, planes and solids. Translate endless pictures into the language of elementary mathematics, which is Euclidean geometry. After his geometry was founded, many students gathered around him, including poor children, rich children and even kings.
The students all respect Euclid and idolize him because he "teaches them like a father". Of course, some followers came to learn geometry from him, and Euclid despised them very much. Once, after learning the first theorem, a noble son eagerly asked him, "What's the use of learning geometry?" Seeing that Euclid ignored him, thinking that the teacher had not heard him, he repeated it. Euclid turned to the servant and said, "Give this gentleman some money quickly. He won't learn without money! " "In the 3rd century BC, Euclid's outstanding work" The Elements of Geometry "came out. On the basis of summarizing the previous research results, he established a magnificent geometric building by axiomatic generation. After the book came out, it was widely circulated in the form of manuscript 1800 years. After the appearance of printing, it was translated into various languages all over the world. The knowledge of plane geometry and solid geometry that we learned in middle school mainly comes from this book two thousand years ago.
Building a Dream with the Future Universiade Theme Activity Essay 8 8 Scientific spirit is the torch to illuminate human progress. Great progress or breakthrough in the history of science is the result of continuous exploration and research by scientists. Scientific achievements are important, but the scientific spirit of continuous practice, courage to explore and perseverance is the most precious and worth learning. This is my biggest feeling after reading the popular romance of mathematics, physics and chemistry.
The Popular Romance of Mathematics, Physics and Chemistry is a novel by Liang Heng, a contemporary writer and journalist. This book uses China's unique genre-Zhang Hui's novel, and tells the life contribution of great scientists with easy-to-understand language and vivid and interesting plots. This book popularizes the history of mathematics and physics for readers, and makes people realize that scientific achievements are hard to come by. Those tedious historical stories were transformed into concise, interesting and touching stories by Mr. Liang Heng with vivid language, which aroused readers' interest in reading.
Through reading this book, I learned many stories about scientists and found that behind these scientific achievements, there are not only sweat and tears, but also joy and laughter. In any case, the dedication and sacrifice of every scholar are meaningful. It is because of them that ordinary but extraordinary formulas are now available. As Mr. Liang Heng said, "How precious and lovely these formulas are".
After reading the popular romance of mathematics and physics, what impressed me most was the scientific spirit of the scientists in the book, especially the spirit of courage to practice, in-depth exploration and perseverance. I admire many scientists in the book very much. They choose their own direction and goals and seek truth through constant practice and exploration. The road of scientific exploration is full of ups and downs, but they ran to the goal with perseverance and finally achieved something. There are many such characters in the book, such as Zu Chongzhi, Bruno and Kepler.
In this book, one person impressed me deeply, that is, Zu Chongzhi, a mathematician and astronomer in the Southern and Northern Dynasties. Zu Chongzhi was smart and knowledgeable when he was young, but in the face of scientific exploration, he was meticulous and kept getting closer to the truth.
Zu Chongzhi's greatest contribution in the history of mathematics is to calculate a very accurate approximation of pi, that is, 3. 14 15926 pi < 3. 14 15927. At that time, in Liu Hui's Nine Chapters Arithmetic, it was mentioned that pi was 3. 14, which was already a very accurate figure, but Zu Chongzhi still wanted to keep improving and calculate more accurately. He cut the circle into six equal parts, then carved the dodecagon, quadrangle and 48-sided shape in turn ... Then he calculated with the chip cut by Hsinchu, and his fingers were gradually worn out by the chip. Zu Chongzhi worked out the approximate value to the seventh decimal place after calculation day and night, until the cock crows at the setting of the moon. I think this spirit of pursuing truth, being brave in exploration and perseverance is the most worthy of our study, and this scientific spirit is the torch to illuminate human progress.
After reading The Popular Romance of Mathematics, Physics and Chemistry, I feel that I should firmly go on with my life goals. Even in the face of difficulties, as long as I am in the right direction, don't give up and keep working hard, I will always reach my destination.
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