Cat's eyes can shine because there is a substance in them. When it shines, the light is like the light from a flashlight. Therefore, it can see the mouse clearly and catch it in the dark. This is really a lamp in the dark. First of all, the questions raised
I have a lovely kitten at home. At night, its little eyes will glow. It's so dark at night, it can still see small and exquisite mice. Why? Why did people see the night when infrared was invented? So, several of our interested students began to study.
Second, the survey method
1, consult the encyclopedia of animals and relevant books;
2. Search the Internet for relevant information and sort it out;
3. Ask the science teacher;
4. Learn the story of infrared discovery through various channels.
Third, data collation.
The eyes of a cat surfing the Internet will glow because it can reflect light. The cat's eyes have a special coating like a mirror, which enables the cat to see clearly in the dark. This glitter can reflect light like a flashlight or car headlights, and make a cat's eyes glow.
There is a question in Herschel's heart, about the story discovered by searching the infrared rays of the sun on the Internet. Do sunlight and different colors of light contain the same amount of heat? 1800, he designed a simple experiment to make sunlight pass through a prism to produce a color spectrum. Using three thermometers coated with black alcohol balls, one is placed under a certain color of visible light, and the other is placed outside the visible light as the background value. It is found that the temperature rises from purple light, blue light, green light, yellow light, orange light to red light in turn! Even more incredible, he found that the temperature next to the red light area was higher, where the naked eye could not see the light, and there was light that the eyes could not see! This is the first time that humans have discovered invisible light, which is called infrared light.
Ask the science teacher about the principle of infrared ray. Infrared ray is one of many invisible rays in the sun (discovered by German scientist Huxley in 1800). Infrared rays, also known as infrared thermal radiation, have wavelengths ranging from 0.76 to 400 microns. Everything above absolute zero (-273℃) can produce infrared rays.
After infrared rays irradiate the body surface, one part is reflected and the other part is absorbed. When irradiated by long-wave infrared rays, most of them are reflected and absorbed by shallow skin tissues, and the depth of penetration into the skin is only 0.05 ~ 2 mm, which can only affect the surface tissues of the skin; Short-wave infrared rays and near-infrared rays of red light penetrate the tissue most deeply, and the penetration depth can reach 10 mm, which can directly act on subcutaneous tissues such as blood vessels, lymphatic vessels and nerve endings of the skin. Infrared therapy is based on the warming effect. Under infrared radiation, tissue temperature rises, capillaries dilate, blood flow accelerates, substance metabolism increases, and tissue cell vitality and regeneration ability improve.
Four. conclusion
1, the cat's eyes can shine because there is a substance in them. When it shines, the light is just like the light from a flashlight. Therefore, it can see the mouse clearly in the dark and catch it. This is really a lamp in the dark.
The principle of infrared ray is similar to cat's eye, and it is also invisible light. In the dark night, it can emit sound waves, and when it touches something, it will reflect back, so that people know that there are obstacles ahead and should avoid them, thus reducing the occurrence of traffic accidents.
3. Animals are human teachers, just like radar, learning from the ultrasonic waves emitted by bats; Like infrared rays, it is learned from the eyes of cats; Like bone needle, it is learned from the shape of fishbone; Like airplanes, they learn from birds ... In short, many inventions and discoveries of human beings are learned from animals and nature.
2. Write a research report: a research report on myopia.
First put forward the topic: many students in our class have brought glasses one after another, and I am one of them. How many people are nearsighted? Why are they nearsighted again? I did a survey.
Second, the survey method:
1, consult related books to understand how ordinary people are nearsighted.
2. Investigate and ask classmates how they are nearsighted.
Find out how many people in Class One are nearsighted through various channels.
4. Publish the questionnaire through the class blog.
Three. Investigation and data collation:
There are 1 1 people in my class.
The myopia rate in China is close to 30%, 22.7% of primary school students suffer from myopia, and the myopia rate in junior high school has soared to 55.8%. 70.3% of high school students wear glasses, and the myopia rate of college students is as high as 80%.
There are many reasons for myopia. According to our guess, there are genetic factors, environmental factors, individual factors, nutritional factors and sleep factors. The main causes of myopia in primary school students are doing homework too late, not getting enough sleep, watching TV and playing computer too much, and consuming a lot of German and protein.
The myopia rate of primary school students is very high now. Although myopia has some genetic factors, what is more important is the influence of external factors. At present, there is no more effective treatment except wearing glasses, and only permanent preventive measures can be taken. Although the high myopia rate of middle school students is related to the current education system, it is more due to the habit of using eyes. The key to prevent myopia is to develop good eye habits.
Four. conclusion
Through the analysis of the questionnaire, I found that:
1. Generally speaking, the homework burden of most students is very heavy, and it increases with the growth of grades.
2. No matter what grade you do your homework, you don't have a good rest for your eyes; The rest time at school once again shows a trend of decreasing with the increase of grade.
3. Anti-fatigue eye drops and eye exercises have therapeutic effects on eyes, but they have not attracted the attention of students.
Although there are many people who are nearsighted than those who are not, people who don't wear glasses still account for a considerable proportion. This shows that students pay insufficient attention to myopia!
5. The factors, such as incorrect posture and improper use of eyes, can be overcome and corrected as much as possible; For example, if the light is too dim or too strong, we can adjust it. We can try to avoid such things as improper protection and improper medication; ……
I made the following suggestions:
1, insist on overlooking, eye exercises and recess exercises every day, and actively participate in cultural and sports activities.
2. There should be enough light when studying, and the light should always be from the left. Don't read or write in weak light, dazzling sunlight and strong light.
Don't sleep in bed or read while walking. Don't read and write at your desk.
4. Don't use your eyesight for a long time. Every 50 minutes of study, rest 10 minutes.
5. Don't watch TV too often for too long, and control it within 1 hour. Not too close. At least two meters apart.
3. Write a research report: a research report on the history of Chinese characters.
Ask questions first. Chinese characters are one of the oldest characters in the world, with a history of more than 6000 years. Chinese characters are the cultural treasure of the Chinese nation and everyone's spiritual home. There are Chinese characters everywhere around us. So how did Chinese characters come from? Who did this? What kind of evolution has it undergone? In order to understand these problems, I made a study on the history of Chinese characters.
Second, research methods.
I studied this problem in the following ways:
1, search online.
2. Consult books, newspapers and periodicals.
3. Ask relevant people.
Third, investigation and research and data collation.
I found a lot of valuable information through book search and online search, which is carefully arranged as follows:
1, Chinese characters have changed for more than 6,000 years, about in the late Shang Dynasty in the14th century BC, at this time, a preliminary stereotyped writing has been formed, that is, Oracle Bone Inscriptions and Oracle Bone Inscriptions are pictographs, which are very vivid.
2. Chinese characters are made, formerly known as Hou Gang and real name Jia, commonly known as the former teacher, the grandson of Shi Huang, Cang Wang and Cang Sheng. Shuowen Jiezi, Shiben and Zhunanzi all recorded that Cang Xie was the main historian of word creation in the period of the Yellow Emperor. Inspired by the meaning, seeing the footprints of birds and beasts, collecting, sorting out and utilizing them played an important role in the creation of Chinese characters, and was honored as a "sage of word creation".
3. Chinese characters are gradually accumulated from scattered characters, and after reaching a certain volume, they form a writing system through artificial standardization. The evolution process can be simply summarized into five parts: sound, shape, image, number and reason. The order is Oracle Bone Inscriptions, bronze inscription, seal script, official script, regular script, cursive script and running script, among which Oracle Bone Inscriptions is the earliest Chinese character.
Four. Research conclusion
1. Chinese characters were formed in the late Shang Dynasty in14th century BC.
Chinese characters are made in Cang Xie.
3. From Oracle Bone Inscriptions to running script, Chinese characters have undergone seven evolutions. The evolution of Chinese font not only reflects the long history of Chinese characters, but also makes us curious about the long history of ancient China.
4. Write a research report: Wang Xizhi's calligraphy model essay in the second volume of the fifth grade.
I. Question: During the development of Chinese characters in China for thousands of years, there are many calligraphers of Chinese characters, including some great sages of calligraphy, such as Ou Yangxun and Liu Zhenqing, whom we are very familiar with. But why is the most famous one not Wang Xizhi?
Second, research methods
1, search Wang Xizhi's information on the Internet;
2. Watch a documentary about Wang Xizhi;
3. consult history books.
Third, investigation and research and data collation.
I found a lot of valuable information through searching books and online search, which is carefully arranged as follows:
Wang Xizhi, a native of Jin Dynasty, began to learn calligraphy from an early age and practiced calligraphy every day, so he was appreciated by his family. His calligraphy is not a specific font, but a combination of regular script, running script and cursive script. The most famous work is Preface to Lanting Collection, which vividly writes Xingtai and is deeply loved by Emperor Taizong. Another of his masterpieces, Sunny Days in the Snow, is actually a 28-word letter written by Wang Xizhi to others, but it was treasured by others, which shows how famous Wang Xizhi's calligraphy was at that time.
In his later years, Wang Xizhi said that he was ill and resigned, and began to travel all over the country, leaving many famous calligraphy works.
Four. Research conclusion
1, Wang Xizhi's calligraphy style
(1) Every book in the collection is Wang Shu, including official script, regular script, running script and cursive script.
(2) Learn and apply Zhong You official script; Learn Zhang Zhishu and analyze cursive script.
(3) The most obvious features are exquisite brushwork, changeable structure and various beauties of official script, regular script, running script and cursive script.
2. Wang Xizhi's regular script, running script and Cao Shu.
(1) Regular script, Huang Tingjian, painting praise, etc.
(2) Running scripts include Preface to Lanting Collection and Confucius Post.
(3) The cursive script includes seventeen articles and funeral articles.
5. Write a research report. Model essay in the second volume of the fifth grade: an investigation report on people's way of celebrating the New Year.
Investigation time: 20 12 65438+ 10/-23 investigation purpose: the spring festival is the most traditional, important and lively festival in China, and every household can celebrate the new year with decorations and enjoy the wonderful time of family reunion. The purpose of this survey is to know how people celebrate the New Year and get close to them.
Respondent 1: mom.
Respondent No.1 declared: Let's be low-carbon and not set off fireworks this Spring Festival. Just watch it on the bridge for a while. Isn't it also a bustling scene? As usual, New Year's Eve is eaten with grandparents and elders. How happy we are together! When the time comes, grandpa will give you lucky money, and you will become a temporary monopoly again! After dinner, let's watch the Spring Festival Gala. Old-fashioned, huh, huh?
Respondent 2: Migrant couples.
Respondent No.2 stated: We have been here for more than two years and haven't gone home for the New Year. Our hometown is in Henan, which is too far away to buy a train ticket home. So it's a good thing to send more money home for our children to go to school. You see, just last night, we collected so many fireworks boxes that we could make a lot of money!
Respondent 3: The owner of a villa.
Respondent No.3 stated: I am very busy all year round, eating out every day, and I have no time to spend with my family. China New Year is coming. I decided to invite a famous chef to cook a "Man-Han Banquet" in my luxurious villa and invite the whole family, old and young, to have a happy New Year's Eve dinner. It will be warm. Look, I also bought many fireworks! There will be a fireworks party on New Year's Eve. All the neighbors are going to set off fireworks together and have a happy New Year!
Respondent 4: Little Auntie
Respondent No.4 stated: I work in the telephone office of the Telecommunications Bureau, and it's my turn to be on duty this Spring Festival, so I can't go home. I can't help it! Sitting at a desk, eating a box lunch and watching the phone will definitely be lonely, but it will be unforgettable for the new year. I still feel so happy at the thought of being reunited with my family and visiting relatives and friends after work!
Survey summary:
First, the way our family celebrates the New Year should represent the general way of celebrating the New Year for thousands of ordinary families in Qian Qian, China. But mom's low-carbon concept is definitely an example for everyone to learn!
Second place: Although foreign uncles spend the New Year in a shabby way, they are still very happy because they have infinite concern for their families. This also reflects the helplessness of countless migrant workers.
Third: It is a luxurious way to celebrate the New Year. It's luxurious, but it still retains the traditional Chinese New Year way in China-going home for the New Year!
Fourth place: The portrayal of workers who absolutely stick to their posts in Qian Qian. Please allow me to pay tribute to these workers' uncles and aunts who still stick to their posts after the Spring Festival! You have worked hard!
Survey summary: With the improvement of people's living standards, people of different conditions and levels have different ways to celebrate the New Year. However, in this traditional Spring Festival, family reunion is still in a very important position. No matter how busy and far away, it is always people's heartfelt wish to reunite with their families!