Brief introduction of scientific knowledge

Scientific knowledge stick figure 1. Scientific handwritten newspaper pictures {primary school students}

Why do most household appliances such as electric fans, washing machines and refrigerators use three-wire plugs? What is the difference between a three-wire plug and a three-phase plug? Three-phase electrical appliances refer to three different live wires, and the voltage between each two wires is 380 volts. They are generally used in power systems and are more common in industrial electricity consumption.

Single-phase power supply is generally used in household appliances, and its three wires are live wire, neutral wire and ground wire. The voltage between the live wire and the neutral wire is 220 volts, so this is not three-phase electricity, and its plug socket is not a three-phase plug socket. The grounding wire is to ensure safety. Fruit hawthorn with antihypertensive effect; Hawthorn can dilate blood vessels and lower blood pressure and cholesterol.

You can choose 10 wild hawthorn (fresh is better), mash it with 30 grams of white sugar, and take it after decocting in water, which has a good effect of lowering blood pressure and invigorating stomach. Bananas; Bananas contain a variety of vitamins, which can clear away heat and lower blood pressure and can be eaten regularly.

It is also effective to decoct with 30~60 grams of banana peel or fruit stalk. Take a proper amount of plantain flowers and take them with water, and the curative effect is better.

Water chestnut; It has the effect of clearing away heat and lowering blood pressure. You can use fresh water chestnut (washed, mud removed) and jellyfish (washed and salt removed) to cook soup three times a day.

It can not only lower blood pressure, but also reduce phlegm and relieve cough. Pineapple basket: Eating pineapple regularly can strengthen the hydrolysis of fibrin in the body, which has a good effect on improving blood circulation and eliminating edema and inflammation in hypertension, edema and thrombosis.

Mume: Rich in citric acid, malic acid and succinic acid. For those with hypertension, dizziness, insomnia and difficulty sleeping at night, 3 pieces of ebony and appropriate amount of rock sugar can be stewed with boiling water, which has the functions of lowering blood pressure, sleeping peacefully, clearing away heat and promoting fluid production.

Apple: It contains malic acid, citric acid, vitamins A, B, C, etc. 10. Eating apples often can improve arteriosclerosis. Scientific tips for drinking milk are beneficial to health, but many people still have some conceptual misunderstandings when drinking milk. Here are some tips for drinking milk scientifically.

1. It is not advisable to drink milk on an empty stomach in the morning. Because the gastrointestinal peristalsis is fast when the human body is on an empty stomach, the nutrients in milk often rush into the large intestine before being absorbed.

In addition, the method of swallowing milk is not feasible, because it will reduce the chance of mixing with saliva in the mouth, which is not conducive to digestion and absorption. You'd better eat some biscuits, cakes, etc. Before drinking milk, or eating snacks while drinking milk.

Drinking milk at night is more beneficial. Scientific research has found that there is a special law of calcium metabolism in human body: at night, especially at midnight, the plasma calcium content will appear a "trough", forcing the body to transport part of calcium in bones to supplement it through regulation mechanism.

Although this temporarily maintains the calcium in the blood, the calcium in the bones is reduced. Milk is rich in calcium. Drinking a glass of milk before going to bed can compensate the body's demand for calcium at night.

Milk should not be cooked with sugar. Milk is rich in amino acids. At high temperature, lysine in milk reacts with sugar to produce a new compound-fructosyl amino acid.

This substance can't be digested and absorbed by human body, but it affects human health. It is best to drink fresh milk. If it is too cold, you can heat it a little. If you don't like milk, you can drink yogurt.

Most people who hate milk suffer from lactose intolerance. These people can try to drink yogurt. The lactose content in yogurt is greatly reduced, but almost all the nutrients in milk are retained. Among them, lactic acid bacteria can survive and reproduce in human body, which is beneficial to the absorption and utilization of nutrients and improves immunity.

Yogurt contains no antibiotics, is easy to digest and absorb, and can be drunk on an empty stomach. 5. Yogurt can't be heated for drinking.

Drinking yogurt is mainly about eating its nutrients and living bacteria. For example, when yogurt is heated, the human body can only drink nutrients but lose bioactive lactic acid bacteria, so don't drink it after heating. Mercury is the smallest earth-like planet in the solar system.

It is difficult to observe because it is blocked by the strong light of the sun. On his deathbed, Copernicus regretted that he had never seen Mercury in his life.

Since the 1970s, people have learned more about water quantity. Mercury is the smallest earth-like planet in the solar system.

It is difficult to observe because it is blocked by the strong light of the sun. On his deathbed, Copernicus regretted that he had never seen Mercury in his life.

Since the 1970s, people have learned more about water quantity. Mercury is the closest to the sun, only 57.9 million kilometers, which is 0.387 times the distance between the sun and the earth. Mercury's equatorial radius is about 2/5 of that of the earth.

Mercury has no air. Mercury looks very similar to the moon, and its surface is covered with craters of all sizes.

Volcanic activity may have occurred hundreds of millions of years ago. Now there are several plains that look like volcanic lava on the surface of the star, and there are craters everywhere, large and small. Mercury has a huge concentric structure with a radius of about 1300 km. It is located at 30 degrees north latitude and 0/95 degrees west longitude of Mercury. Because it is extremely hot, it was named "Calorie Basin" by scientists.

There are more than 100 craters with radial stripes on the surface of Mercury, and a large number of cliffs three or four kilometers high, some of which are hundreds of kilometers long. The density of mercury is close to that of the earth.

Its center may be a core of iron and nickel similar to the size of the moon, and it also has a magnetic field, but its intensity is only1100 of that of the earth. Mercury's orbital speed is 48km/s, which is faster than the Earth's 18km.

It only takes 88 Earth Days, and less than three months after the Earth, Mercury will be 1 year. However, Mercury's "day" is very long. Mercury rotates 1 nearly 58.65 earth days, which means that 1 day of mercury is nearly two months of the earth, and only two sunrises and sunsets can be seen in 1 year on mercury.

Mercury, like Venus, has no satellites. Scientific and technological figure /chinababyxl/kwbc/kjrw/ Hua is one of the leading mathematicians in number theory.

But he would rather start a new stove and leave number theory to study algebra and complex analysis that he is not familiar with. As early as 1940s, he proposed that "genius lies in accumulation, and cleverness lies in diligence".

Although Hua is brilliant, he never mentions his talent. Instead, he regards "diligence" and "accumulation", which are much more important than cleverness, as the key to success, and repeatedly educates young people to learn mathematics so that they can exercise themselves at any time. In the mid-1950s, Hua proposed: "There should be speed and acceleration." The so-called "speed" means producing results, and the so-called "acceleration" means constantly improving the quality of results.

1978, he earnestly put forward at the Chengdu conference in chinese mathematical society: "Early publication, late evaluation." Later, it was further proposed: "Work hard.

2. How to draw the scientific record book of the first volume of the fifth grade?

A few days ago, the first selection activity of outstanding science notebooks for primary school students in Wenzhou was successfully concluded. More than 100 science notebooks of award-winning students were exhibited in experimental primary schools and several schools in Lucheng District, ouhai district and wencheng county. From the science notebook, we can get a lot of information about students learning science. Every science notebook is a child's world, and it is the footprint of children's growth. "Creative House", "Lab" and "Broadband Network" ... Students' scientific records are really rich. Look, there are phenomena and data they observed in class, and there are also small extracurricular experiments designed by students according to the knowledge in class. For example, after taking the course "Research on Pendulum", students set up small experiments such as "Does the material of pendulum rope affect the speed of pendulum" and "Does changing the material of pendulum affect the speed of pendulum". In these experimental records, there are words, charts, photos, paintings, scrapbooks and illustrations, just like a small science magazine.

Teacher Shi, a primary school science researcher at Wenzhou Education and Teaching Research Institute, said: "Students' experimental recording methods do not require unification. Every student can record the process of science learning in his own way. With the process of scientific inquiry, children's record level is constantly improving, which is also a kind of growth. "There are many ways to express students' notebooks. The notebook of the second primary school in Oubei Town, Yongjia is full of colorful pen and ink drawings; Zhang Kaixiang's science notebook in experimental primary school is like a comic book. He integrated his professional knowledge of painting into the experimental records, and every experiment was recorded with cartoons and a small amount of words. Zhu Peipei, an experimental primary school student, has a thick scientific record book, including words, pictures or specimens, which keeps her study records from grade three to grade five for more than two years.

A beautiful booklet that records the children's scientific exploration process records the students' scientific exploration footprints. Here are some excellent notebooks for your reference.

A small file of growth

Author: Yao Piaopiao, Class 5 (3), Shuangyu Central Primary School, Lucheng District

Features: Without colorful patterns, simple words can make excellent notebooks. The author puts his own photos on it, extracts famous sayings and encourages himself to record what he sees and hears at any time. The author has set two major themes: in-class and out-of-class. In class, the experimental results are sorted out through the columns of "asking questions", "experimental materials", "experimental process" and "conclusion". After class, follow-up inquiry activities are recorded by means of "asking questions", "designing experiments by yourself" and "looking for information".

Tip >>& gt

When buying a notebook, try to choose a notebook with larger paper and more pages. Large, you can record more content, and it is convenient to paste the small scientific folders distributed by teachers in class into the notebook; Thick, you can record more scientific experiments from grade three to grade six, so that you can review and review later and feel your growth and progress through reading. Junior students try to choose paper with fine shading to avoid the phenomenon of crooked characters when recording. To learn the method of recording, the theme and date should not be ignored in the record of each research activity, and the whole record book should be organized into directories and page numbers for easy reference. Finally, it is most important to develop good recording habits.

Scientific notebook

Author: Qiu Shuyang, Class 6 (5), Chengnan Primary School, Wenzhou

Features: "Why to observe with a magnifying glass", "New discoveries under a magnifying glass", "Features of a magnifying glass", "Knowledge link" and "Review and Summary" ... The author's column setting is very unique, much like class notes, which includes a lot of expansion of scientific knowledge in addition to experimental observation. Records are mainly written, supplemented by clip art and pictures, and are good books for scientific review.

Scientific emotional record

Author: Class 3 (8) of Zhu Guangchang Road Primary School

Features: 15 The Diary of Silkworm Baby Observation is more like the author's diary, and the author records the process, observation and feelings of sericulture in detail in each article. She also took photos, drew cartoons and posted them in her notebook, which enriched the observation content. In addition, there is a "mother's language" after each article, which records the experimental dialogue, observation, tidbits and mother-daughter feelings. The fact that the mother and daughter went into battle together really added a lot of interest to the record book.

Small scientific journal

Author: Ye Zihuai, Class 6, Washi Primary School

Features: each experiment records the contents of six columns: "idea house"-recording the author's existing cognition of things; "window of knowledge"-combing classroom scientific knowledge; "laboratory"-recording the process and discovery of the experiment through charts and data; "Broadband Network" is the related subject knowledge collected by the author through the Internet after class. "Creative Workshop" is a small experiment designed by students according to what they have learned in class. For example, after learning magnifying glasses, they make magnifying glasses from various materials. "Message board" is some interactive evaluations of students, teachers and parents.

Scientific book making

Author: Fang Zhou Yan, Grade 5, No.2 Primary School, Oubei Town, Yongjia.

Features: red, yellow and green; Flowers, leaves and bows; Frogs, pigs and ducks ... are brightly colored and rich in patterns, which is our first impression. The author records scientific experiments with his favorite colorful and patterned icons, which is cute and playful to read.

3. How to draw a technical handwritten newspaper

Learning science and popularizing science and technology with science is a great historical driving force for human progress and social development. As a bridge between science and technology and human society, popular science is an eternal theme in human history. Why do leaves fall in autumn? Defoliation is a skill of broad-leaved trees in temperate regions to reduce transpiration and prepare for safe winter. Autumn means the coming of winter, trees need sleep to protect themselves, and dormant trees themselves need nutrients in winter. In order to adjust their internal balance, many trees need to shed leaves to reduce the loss of water and nutrients and conserve energy until conditions are suitable. Some trees, such as conifers and cypresses, can remain evergreen because their leaves are like needle tips, and there is little loss of water and nutrients. Scientific tips around us-safety articles Why do red lights stop and green lights go? Although red light and green light are both colored light, there are also differences: in foggy days, red light travels farther than green light and has stronger penetration than green light. Therefore, using a red light as a stop signal can make drivers see it earlier and make preparations earlier. If you use the green light as a stop signal, the driver's uncle will have an accident before he can brake. Children should also obey the traffic rules. You must remember that the red light stops. In fact, the so-called science is sometimes around us, and we can find them through careful observation and strong thirst for knowledge.

4. How to draw science fiction painting?

Today, with the development of modern social life and the decreasing limited natural resources of the earth, it has become a top priority for the world to explore the space outside the earth and save the harsh environment on which we live. Scientists and people of insight all over the world are exploring and anxious. Anxiety makes us have all kinds of delusions: to live on the moon, to live on Mars, to turn the desert into an oasis, and to fly into space with robots. It has changed from a dream of human beings to a reality, but to fly further and better develop and utilize space for the benefit of mankind, we still need to constantly fantasize and practice hard. Pupils can draw science fiction painting to fantasize and practice. What should we draw? You can draw fantasy flights to expand the farther and larger space of human life, build a space city and design aircraft; You can also imagine a good solution to today's environmental disasters, such as repairing the ozone layer (solving the problems of global warming and ultraviolet rays entering the atmosphere) and cable cars in high buildings (solving traffic jams); Large-scale afforestation (flood control, sand control). Of course, we can also imagine solutions to problems such as pollution and virus harm. How does science fiction painting draw? First of all, teachers should collect and master relevant information about aerospace and environmental protection, broaden their horizons before students draw science fiction painting, and let students draw real and whimsical things. For example, show students pictures and videos. You can also arrange for students to find information about aerospace and environmental protection before class. Students should pay attention to investigate and collect social and environmental problems existing in local communities, such as roads, traffic, houses, garbage, food, waste gas, waste water, commodities, vegetation, etc. Teachers can choose science fiction painting painted by their classmates as a model painting for your reference. In order to expand the shortage of teaching materials, you can also choose some children's toys (spacecraft, rockets, robots, etc.). ) as a teaching reference. When students have relevant materials, they will put forward good solutions to the problems existing in life, express their meaning through sketches, and finally carry out imaginative creation under the guidance of teachers until it is completed. How to draw should be given some guidance. If the painting is relatively large, the composition is full, the image is vivid, the lines are smooth, the colors are etc. It can be carried out in three steps: imagination, sketch and drawing. You can take the good work of your peers as a guide, and you can also learn from the works of painters. There are various ways to draw science fiction painting. You can consult and cooperate with science and technology teachers, combine the scientific knowledge of natural courses or create after visiting the exhibition of science and technology museum, which is conducive to better painting. You can also jointly run small pictorial magazines and compile science and technology tabloids. It can not only produce new forms, but also produce good results. The manifestation of sci-fi painting can also be completed by computer with drawing software, or by inkjet printing, or published on the Internet, and even can guide capable students to try to make sci-fi web pages. After painting, you can start a small popular science exhibition. The work of holding an exhibition generally includes selecting works, arranging exhibitions, writing exhibition labels, making invitations, drawing and posting posters, and watching exhibitions. There are many ways to arrange exhibits. Should be selected according to the classroom and the actual situation, generally useful picture frames (picture frames provided by the school or simple picture frames made by ourselves) should be hung and displayed with string or iron wire and clips or paper clips. The whole process needs careful planning by the teacher in order to be organized in an orderly way. This part has two goals: first, to show the results of the previous part of the learning activities, that is, the science fiction painting painted by everyone, for appreciation and evaluation; Secondly, we should know how to hold an art exhibition and what we should do. These two parts are linked and complement each other. Holding a small class art exhibition depends on the situation. When students finish their creation and make corresponding preparations for tools, materials and venues, it is best to finish it before weekends or holidays. When visiting the exhibition, we can evaluate the effect of holding the exhibition at the same time, which is also a good opportunity to infiltrate the successful education and inspire students to make free comments on the works of the exhibition.

5. How to draw science fiction painting?

Today, with the development of modern social life and the decreasing limited natural resources of the earth, it has become a top priority for the whole world to explore outer space and save the harsh environment on which we live. Scientists and people of insight all over the world are exploring and anxious. The sense of urgency makes us have all kinds of delusions: living on the moon, living on Mars, turning the desert into an oasis, working with robots ... Flying into space has changed from a human dream to a reality, but to fly further and better develop and utilize space for the benefit of mankind, we still need to constantly fantasize and practice hard.

Pupils can draw science fiction painting for fantasy and practice. What do you want to draw? You can draw fantasy flights to expand the farther and larger space of human life, build a space city and design aircraft; You can also imagine a good solution to today's environmental disasters, such as repairing the ozone layer (solving the problems of global warming and ultraviolet rays entering the atmosphere) and cable cars in high buildings (solving traffic jams); Large-scale afforestation (flood control, sand control). Of course, you can also imagine solutions to pollution, virus harm and so on.

How does science fiction painting draw? First of all, teachers should collect and master relevant information about aerospace and environmental protection, broaden their horizons before students draw science fiction painting, and let students draw real and whimsical things. If you show students pictures and videos, you can also arrange for students to find information about aerospace and environmental protection before class. Students should pay attention to investigating and collecting social and environmental problems existing in local communities. Such as roads, traffic, houses, garbage, food, waste gas, waste water, commodities, vegetation and so on. Enlightened by students' own observation and understanding, teachers can choose science fiction painting, which our classmates drew in the past, as a model painting for everyone to learn, so as to expand the shortage of teaching materials. You can also choose some children's toys (spacecraft, rockets, robots, etc. ) as a teaching reference. When students have relevant materials, they will put forward good solutions to the problems existing in life, express their meaning through sketches, and finally carry out imaginative creation under the guidance of teachers until it is completed.

How to draw should be given some guidance. For example, the painting is relatively large, the composition is full, the image is vivid, and the lines and colors are smooth. It can be carried out in three steps: imagination, sketch and drawing. We can use our peers' good homework as a guide, and we can also learn from painters' works. There are various methods.

Painting science fiction painting can be discussed and cooperated with science and technology teachers, combined with the scientific knowledge of natural courses or created after visiting the science and technology museum, which is conducive to better painting. You can also jointly run a small pictorial and compile a science and technology tabloid, and both new forms can achieve good results. The manifestation of sci-fi painting can also be completed by computer with drawing software, or printed out, or published online, and even can guide capable students to try to make sci-fi web pages.

After painting, you can start a small popular science exhibition. The work of holding an art exhibition generally includes selecting works, arranging exhibitions, writing exhibition labels, making invitations, drawing and posting posters, and watching art exhibitions. There are many ways to display the exhibits, which should be chosen according to the classroom and the actual situation. Generally, it is useful to use picture frames (picture frames provided by the school or simple picture frames made by ourselves), and to hang and display them with strings or iron wires and clips or paper clips. The whole process needs teachers' careful planning to be organized in an orderly way, and it can be divided into two parts to jointly hold exhibitions. This part has two goals: first, to show the results of the previous part of the learning activities, that is, the science fiction painting painted by everyone, for appreciation and evaluation; The second is to know how to hold an art exhibition and what everyone should do. The two parts are connected and complement each other.

Holding a small class art exhibition depends on the situation. When students finish their creation and make corresponding preparations for tools, materials and venues, it is best to finish it before weekends or holidays. Visiting art exhibitions can also evaluate the effect of holding art exhibitions, which is also a good opportunity to infiltrate successful education. Encourage students to boldly comment on the exhibition works. The ornamental art exhibition can be extended after class, so that the small class art exhibition can expand its influence.