The revelation of nature, the content of handwritten newspaper

The inspiration of nature to human beings is varied. Nature's nest is naturally muddy plain, but it is inspired by this that human beings have developed architectural science and established modern big cities. The rivers of nature seem to run day and night regardless of people's will, but aren't they also teaching people how to understand many truths such as gravity and inertial force of motion, and how to develop and utilize the potential of nature? Metal has given more inspiration to mankind. Such seemingly hard things, after being melted by fire, can be turned into human tools according to human needs. More importantly, it makes people understand that all substances have melting points and can be transformed into shapes and states.

Humans made airplanes based on sharks and radars based on bats. Humans invented airplanes based on dragonfly wings, radars based on bats' mouths and ears, ships based on whale shapes, and electronic frog eyes based on frog eyes.

A very strange small gas analyzer was successfully copied from annoying flies. It has been installed in the cockpit of the spacecraft to detect the composition of the gas in the cabin.

1 Successfully copied a very strange small gas analyzer from the annoying flies. It has been installed in the cockpit of the spacecraft to detect the composition of the gas in the cabin.

2。 From fireflies to artificial luminescence;

3。 Electric fish and volt batteries;

4。 The windward ear of jellyfish imitates the structure and function of jellyfish ear, and designs a storm predictor of jellyfish ear, which can predict the storm 15 hours in advance, which is of great significance to navigation and fishery safety.

5。 According to the visual principle of frog eye, people have successfully developed an electronic frog eye. This kind of electronic frog's eyes can accurately identify objects with specific shapes like real frog's eyes. After installing electronic frog eyes in radar system, the anti-jamming ability of radar is greatly improved. This radar system can quickly and accurately identify aircraft, ships and missiles with specific shapes. In particular, it can distinguish between true and false missiles and prevent false confusion.

Electronic frog eyes are also widely used in airports and traffic arteries. At the airport, it can monitor the take-off and landing of aircraft, and call the police in time if it is found that the aircraft is about to collide. On the main road, you can direct the vehicles to prevent them from colliding.

6。 According to the principle of bat ultrasonic locator, people also copied "Pathfinder" for the blind. This pathfinder is equipped with an ultrasonic transmitter, which blind people can use to find telephone poles, steps, people on bridges, etc. Nowadays, "ultrasonic glasses" with similar functions have also been made.

7。 By simulating the incomplete photosynthetic mechanism of cyanobacteria, a bionic photolysis device was designed to obtain a large amount of hydrogen.

8。 According to the study of human skeletal muscle system and bioelectricity control, a human strength enhancer-walking machine is copied.

9。 The hook of modern crane originated from the claws of many animals.

10。 Corrugated roofs imitate animal scales.

1 1。 Paddles imitate the fins of fish.

12。 Saw mantis arms, or saw grass.

13。 The plants of Xanthium were inspired to invent velcro.

14。 Lobster with keen sense of smell provides people with the idea of making odor detectors.

15。 Gecko toes provide inspiration for making reusable adhesive tape.

1 Successfully copied a very strange small gas analyzer from the annoying flies. It has been installed in the cockpit of the spacecraft to detect the composition of the gas in the cabin.

2。 From fireflies to artificial luminescence;

3。 Electric fish and volt batteries;

4。 The windward ear of jellyfish imitates the structure and function of jellyfish ear, and designs a storm predictor of jellyfish ear, which can predict the storm 15 hours in advance, which is of great significance to navigation and fishery safety.

5。 According to the visual principle of frog eye, people have successfully developed an electronic frog eye. This kind of electronic frog's eyes can accurately identify objects with specific shapes like real frog's eyes. After installing electronic frog eyes in radar system, the anti-jamming ability of radar is greatly improved. This radar system can quickly and accurately identify aircraft, ships and missiles with specific shapes. In particular, it can distinguish between true and false missiles and prevent false confusion.

Electronic frog eyes are also widely used in airports and traffic arteries. At the airport, it can monitor the take-off and landing of aircraft, and call the police in time if it is found that the aircraft is about to collide. On the main road, you can direct the vehicles to prevent them from colliding.

6。 According to the principle of bat ultrasonic locator, people also copied "Pathfinder" for the blind. This pathfinder is equipped with an ultrasonic transmitter, which blind people can use to find telephone poles, steps, people on bridges, etc. Nowadays, "ultrasonic glasses" with similar functions have also been made.

7。 By simulating the incomplete photosynthetic mechanism of cyanobacteria, a bionic photolysis device was designed to obtain a large amount of hydrogen.

8。 According to the study of human skeletal muscle system and bioelectricity control, a human strength enhancer-walking machine is copied.

9。 The hook of modern crane originated from the claws of many animals.

10。 Corrugated roofs imitate animal scales.

1 1。 Paddles imitate the fins of fish.

12。 Saw mantis arms, or saw grass.

13。 The plants of Xanthium were inspired to invent velcro.

14。 Lobster with keen sense of smell provides people with the idea of making odor detectors.

15。 Gecko toes provide inspiration for making reusable adhesive tape.

The inspiration of nature to human beings is varied. Nature's nest is naturally muddy plain, but it is inspired by this that human beings have developed architectural science and established modern big cities. The rivers of nature seem to run day and night regardless of people's will, but aren't they also teaching people how to understand many truths such as gravity and inertial force of motion, and how to develop and utilize the potential of nature? Metal has given more inspiration to mankind. Such seemingly hard things, after being melted by fire, can be turned into human tools according to human needs. More importantly, it makes people understand that all substances have melting points and can be transformed into shapes and states.

Humans made airplanes based on sharks and radars based on bats. Humans invented airplanes based on dragonfly wings, radars based on bats' mouths and ears, ships based on whale shapes, and electronic frog eyes based on frog eyes.

A very strange small gas analyzer was successfully copied from annoying flies. It has been installed in the cockpit of the spacecraft to detect the composition of the gas in the cabin.

I. State of world water resources

1, water is the source of life, and there is no life without water. Man and water are inseparable. The water content in adult human body accounts for 65% of body weight, and 80% of human blood is water. If the human body reduces 10% of water, it will cause diseases, and if it decreases by 20%-22%, it will die.

Elephants are 70% water, potatoes are 80% water and tomatoes are about 95%. The water in the human body regulates body temperature, promotes metabolism, transports nutrition, eliminates waste, and is busy and orderly. At the same time, water also participates in chemical reactions, combines with protein, sugar and phospholipids, and plays a complex physiological role. A healthy adult drinks an average of 2,200ml of water every day, plus 300ml of endogenous water produced by substance metabolism in the body, making a total of 2,500ml, and the same amount of water is discharged through the skin and feces every day. In a word, it is necessary and necessary to replenish and drain water at intervals every day, which is a symbol of life and the content of life. Water is awesome to people.

2. The total water reserves in the world are about1400 million cubic kilometers, which is about 3000 meters high on the earth's surface. 70% of the earth's surface is covered by water, so some people say that the earth is a blue planet, also called water polo. 97.2% of the water on the earth is distributed in oceans and shallow seas, and these salty waters cannot be directly utilized by human beings (desalination is necessary and costly). The water stored in polar ice sheets and alpine glaciers on land accounts for 2. 15% of the total water, which can not be directly used at present. The remaining 0.65% is directly available to human beings. As can be seen from the figure, water resources are abundant, but the available fresh water resources are extremely limited. If a bucket of water is compared to the water on the earth, only a few drops of fresh water are available.

Of human water consumption, 25% is used for industry, and more than 70% is used for farms and pastures. Agriculture is the most prominent area of water resources contradiction.

The distribution of water resources in the world today is very uneven. Except for Europe, which is rich in water resources because of its superior geographical environment, there are some serious water shortage areas in other continents to varying degrees, the most obvious being the landlocked countries in sub-Saharan Africa, and almost no country does not have serious water shortage problems; Similar problems exist in Asia. For example, per capita water consumption in BC was about 12 liter per day, which increased to 20-40 liters in the Middle Ages and 60 liters in18th century. At present, some big cities in developed countries consume 500 liters per person per day. In developing countries, the demand for water is also increasing. For example, in China, urban water consumption has increased several times in recent 20 years. According to the prediction of relevant experts, by the year 2000, the world water consumption will increase from 390 billion cubic meters in 1985 to 600 billion cubic meters. At that time, people will face a serious global water shortage. The UAE is forced to import 20 million cubic meters of rainwater from Japan every year from 1984.

A war about water. For example, Turkey's large-scale water conservancy projects along the Euphrates and Tigris rivers are equipped with surface-to-air missiles to resist military attacks on water disputes and infiltrators in the Jordan Basin. Many protected areas there were plundered and destroyed, so that seawater flooded in and groundwater could no longer be used by people. In order to avoid conflicts, the Scientific Advisory Committee called for the formulation of a "World Water Charter", and signatory countries were obliged to resolve water disputes by peaceful means.

Second, the status of water resources in China

1, China's total water resources reserves are about 28 1 10,000 cubic meters, ranking sixth in the world, but the per capita water resources are less than 2,400 cubic meters, which is only 1/4 of the world's per capita water, equivalent to 1/5 of the United States and 1/7 of the former Soviet Union. More than 60 countries and regions in the world are seriously short of water, and one third of the population has no access to safe drinking water. In the early 1990s, among the 476 cities in China, there were nearly 300 cities lacking water.

2. Water quality of major waters

1998, among the major river basins (water systems) in China, the Liaohe River and Haihe River are seriously polluted, and the water quality is mainly in five categories or worse. The water quality of Huaihe River is poor, and the water quality above Grade 5 accounts for about 50%. Some sections of the Yellow River are seriously polluted; Songhua River is dominated by four types of water quality; The water quality of the Yangtze River and the Pearl River is good, mainly in the first to third categories. The eutrophication problems in Dianchi Lake, Chaohu Lake and Taihu Lake are outstanding.

Eutrophication: In lakes, reservoirs, bays and estuaries, excessive reproduction of aquatic organisms, especially algae, causes pollution due to the massive accumulation of plant nutrients such as nitrogen and phosphorus. Eutrophication may also turn some malnourished lakes into eutrophic lakes and further develop into swamps and dry land.

Division of water bodies: The first category refers to unpolluted source water. The second category refers to the important centralized drinking water source first-class protected areas, precious fish protected areas and fish and shrimp spawning grounds. The third category refers to the secondary protected areas of centralized drinking water sources, general fish protected areas and swimming areas. The four categories refer to general industrial water areas and recreational water areas that are not in direct contact with the human body. The five categories refer to the general agricultural water use areas and the water areas required by the general landscape.

Three. Water resources in Beijing

1, Beijing is the capital because of water. Beijing's water resources are composed of surface water from abroad, domestic surface water and groundwater. Surface water and groundwater are mainly replenished by rainfall. 1996 The city's total water resources are 4.58 billion cubic meters. Characteristics of water resources in Beijing;

Beijing is a dry and rainy climate in the north of China, and its water resources are seriously inadequate. ※.

There are great changes every year. For example, 1959, the rainfall reaches 1406 mm, while 1993 is only 400 mm. ※.

Rainfall is mostly concentrated in June-August, which often forms surface runoff, and groundwater recharge and conservation are difficult. ※.

3. Five major water systems in Beijing: Jiyun River System, Chaobai River System, North Canal System, Yongding River System and Daqinghe River System. * * * There are more than 0/00 rivers/kloc, with a total length of more than 2,700 kilometers. There are more than 120 lakes and reservoirs.

4. The per capita water resource in Beijing is less than 300m3, which is only 1/8 of the national average and 1/32 of the world average. If the world has a glass of water per capita, China has only 65,438+0.4 of this glass of water per capita, and Beijing has only 65,438+0.32 of this glass of water per capita.

5. Urban domestic water source in Beijing: The tap water supply in Beijing is 2.45 million cubic meters per day, of which 40% comes from groundwater and 60% comes from surface water (surface water mainly comes from Miyun Reservoir). In the summer of 1999, the peak water consumption reached 2.44 million cubic meters/day, which was hardly enough. Guanting Reservoir was originally used to provide drinking water for Beijing. Zhangjiakou, Hebei Province, has been polluted by industry due to the large reduction of water quantity in the past 20 years, which has not met the drinking water standard. It no longer supplies drinking water to urban areas, but uses it for work and agriculture.