1. Who invented the first Telescope in the world

In 1608, Hans Lippershey, Midelburg, the Netherlands, created the world's first Telescope.Once, the two children played with a few lenses in front of Li Poore's shop. They watched the trend in the distant church through the two lenses before and after, and they were highly high.Li Populia picked up two lenses and looked at it, and the turbines in the distance were enlarged a lot.Li Poor ran back to the store and put two lenses in a Tube. After many tests, Hans Lee Polm invented the Telescope.In 1608, he applied for a patent for the Telescope he made and followed the requirements of the authorities.It is said that dozens of Telescope glasses in the town claim that the Telescope has been invented, but it is generally believed that Hans Lipor is the inventor of the Telescope.

The news of the Telescope invented quickly spread in European countries. After the news of Italian scientist Galileo learned the news, it made one.The first Telescope can only enlarge the object by 3 times.One month later, the second Telescope he made can be enlarged by 8 times, and the third Telescope can be magnified to 20 times.In October 1609, he made a 30 -fold Telescope.Garri used a self -made Telescope to observe the night sky. For the first time, the surface of the moon was discovered, covering the mountains and the cracks of the crater.Since then, the four satellites of Jupiter and the sunspot movement of Jupiter have been discovered, and the conclusion of the sun is turning.

Second, astronomical Telescope isWho invented

Almost at the same time, German astronomer Capeller also began to study the Telescope. He proposed another astronomical Telescope in "Kither". This Telescope consists of two convex lenses. Unlike Galileo's Telescope, it is wider than Galileo's visual field.But Capeler did not create the Telescope he introduced.This kind of Telescope produced for the first time from 1613 to 1617. He also created a third convex mirror with a third convex mirror in accordance with the suggestion of Cairple.EssenceSaisa made 8 Telescopes and observed the sun one by one. No matter which one can see the same shape of the sun sunspots.Therefore, he dispelled many people who thought that sunspots might be the illusion caused by the dust on the lens, and proved that the sunspots were indeed observed.When observing the sun, Shanya was equipped with a special Shading glass, and Galileo did not add this protection device. As a result, he hurt his eyes and was almost blind.In order to reduce the color difference between the refraction Telescope in the Netherlands, the color difference between the refraction Telescope made a Telescope with a length of nearly 6 meters in 1665 to explore the halo of Saturn. Later, it made a nearly 41 -meter -long Telescope.

Third, who was invented by reflecting Telescope

In 1793, William Herschel, the system made a reflective Telescope with a diameter of 130 cm in the diameter and made of copper tin alloy, weighing 1 ton.

In 1845, the reflex Telescope made by William Parsons in Britain, with a diameter of 1.82 meters.

In 1917, Hooker Telescope was completed in Wilson Observatory, California, USA.Its main reflexive diameter is 100 inches.It was using this Telescope that Edwin Hubble discovered the amazing fact that the universe was expanding.

Fourth, who invented the refractive Telescope

In 1930, the German Bernhardschmidt will reflect the advantages of refraction Telescope and reflecting Telescope (the refractive Telescope image is small but the color difference and the larger the size, the more expensive the reflected Telescope, the low cost, and the reflex mirror can be made very large.But the existence) combined into the first reflection Telescope.

After the war, the reflective Telescope developed rapidly in astronomical observations. In 1950, a Hale reflecting Telescope was installed on the Paloma Mountain.

In 1969, a 6 -meter -diameter reflex mirror was installed on Mount Pastulfv in the former Soviet Union.

In 1990, NASA sent the Hubble Space Telescope into the track. However, due to the mirror fault, the Hubble Telescope did not fully play its role until 1993 that the astronauts completed the space repair and replaced the lens.Because it can not be disturbed by the atmosphere of the earth, the image clarity of the Hubble Telescope is 10 times that of the image of similar Telescopes on the earth.

In 1993, the United States built a "Kake Telescope" with a caliber of 10 meters on the Monakia Mountain in Hawaii. Its mirror was composed of 36 1.8 meters of reflectors.

In 2001, the European Southern Observatory in Chile developed the "Very Large Telescope" (VLT), which consists of 4 Telescopes with a diameter of 8 meters. Its conservation capacity is equivalent to a 16 -meter reflected Telescope.

On June 18, 2014, the top of Cerro Amazones, Chile, was used to place the world's largest power Telescope "European Grand Astronomy" (English abbreviation E-art).Salo Amazon is located in the Atacama Desert with an altitude of 3,000 meters.E-In the Eye of the world, the "largest sky in the world", is nearly 40 meters wide and weighs about 2,500 tons. Its brightness is 15 times higher than that of a long-distance mirror, and its clarity is 16 times that of the Hubble Telescope.The Telescope costs 879 million pounds (about 9.3 billion yuan), which is expected to be officially put into use in 2022.

A group of Telescopes that were under construction began to impact the white giant brothers on the Monakia Mountain.These new competitors include the 30 -meter -caliber "Thirty Meter Telescope (TMT), 20 -meter -caliber Giant Magellan Telescope (GMT) and a 100 -meter -caliber (GMT).Overwhelming Large Telescope, referred to as OWL).Their initiative pointed out that these new Telescope can not only provide space pictures like a photo of the Hubble Telescope, but also collect more light.There are more understanding and see the planets around the distant stars.

1. What is the material of the mesh suspension

There are many Hammock materials. The most common ones are fabric materials, such as canvas, parachute cloth, etc. Some are also a mesh suspension. So what is the material of the mesh suspension?

The mesh suspension is also called the nylon Hammock. It is made of nylon mesh. nylon net is a chemical fiber woven net with chemical fibers such as nylon wire, nylon wire, polyester silk, and Narun silk.Formed, it has the characteristics of high toughness, good elasticity, corrosion resistance, oil resistance, water resistance, wear resistance, high temperature resistance, weather resistance and other characteristics. In addition to making suspension, it is also widely used in industrial filtration, oil, chemical, printing and other fields.

Second, the suspension mesh is good or good canvas

The mesh suspension and canvas hammocks are suspension of two different material fabrics. In addition to the differences in material, the two are also different in terms of experience and comfort. So which one is the best mesh suspension and canvas suspender?

1. canvas suspension is a fabric of traditional manufacturing suspension. Its biggest advantage is softness and comfort, large bearing gravity, easy to clean, and it is more comfortable to lie down. The disadvantage is that the moisture resistance is poor and the breathability is worse.

2. The advantage of mesh suspension is that the breathability is very good and the heat dissipation performance is better. The disadvantage is that the comfort of lying on the lay down is average, and if a friend with a relatively large weight is lying up, it is easy to have a trace, and the public occasion will be a bit embarrassing.

Generally speaking, the canvas hammocks and mesh suspension have their own advantages and disadvantages. Generally, it is better to use a mesh suspension by the seaside, the lakeside, the poolside and the weather.Essence

[How to choose a barbecue rack] How to clean the barbecue rack with a barbecue rack

How to choose a barbecue rack

barbecue rack is an indispensable kind of barbecue Tool when making barbecue foods. In the process of making barbecue foods, barbecue racks will be in contact with barbecue food at any time. Therefore, the cleaning and maintenance of barbecue racks is very important.When home, it not only causes pollution of barbecue foods, but also affects the color effect of barbecue food.Based on the more than ten years of barbecue experience in Xingxin Food Square, we put forward some suggestions for cleaning and maintenance for barbecue.

The cleaning and maintenance of barbecue racks should always run through the entire barbecue process. First of all, when purchasing barbecue racks, pay attention to the type, material, process and characteristics of the barbecue rack.

barbecue racks can be divided into: round plane barbecue racks, round concave barbecue racks, Square plane barbecue racks, Square concave surface barbecue racks.

There are generally two types of barbecue racks: stainless steel and iron.If it is used as a mesh base, the surface treatment can be galvanized and chrome -plated, the surface is Smooth, and the structure is reasonable.

The process of barbecue racks is divided into partitioned flowers, woven, and arc welding. It is mainly made of stainless steel wire welding. The surface is polished and welded.wait.

The characteristics of barbecue racks are economically affordable, high temperature resistance, non -deformation, no rust, non -toxic and tasteless, environmentally friendly and hygienic, and convenient use.Easy installation and beautiful appearance.At present, the barbecue racks for many barbecue restaurants are basically chrome -plated barbecue racks. They are safe and hygienic, convenient, lightweight, novel in shape, fine -grained, sophisticated materials, luxurious and generous, durable and durable.

How to clean the barbecue rack

In the process of barbecue food, the barbecue rack is contacted with barbecue food, and there is fire burning. Oil or carbon dirt is the main source of pollution of barbecue racks. Before the barbecue food is carried out, the first step is to wipe the barbecue rack and beforeBarbecue food.

The second point is that after each grilled food is baked, it must be cleaned once, thoroughly cleaned the oil and carbon dirt, and then baked the next food.The third point is that after all the barbecue work was over that day, a thorough cleaning work was done to ensure that the barbecue work the next day was carried out normally.

The fourth point, you can use the oil -removing cleaner to be sprayed directly when the oil -removing cleaner is used to be used. After waiting for a few minutes, you can easily remove the oil with a wet cloth or paper towel.Or use vinegar to soak it, and then brush it with a steel wire. The more commonly used method is to wipe it with a wire ball.

The cleaning and maintenance of the barbecue rack is ready, and it will be handy when it operates. Diners can eat nutritious and assured barbecue foods. If you can make first -class characteristic barbecue foods, then barbecue operators make money without worry.

1. The breeding method of red bird coral

1. Environment

Red bird corals have strict requirements on light. During the usual period of maintenance, they must be placed in the astigmatism in the soft light, and the season should be avoided to the strong light; the control temperature is about 16-27 C.Otherwise it will be frostbite.

2. Water

Red bird coral is a fleshy root plant. Do not water too much water during the growth. It is best to wait until the pot soil is dry. The watering should be reduced in winter, and the water content of the soil is about 40%.After the soil is turned to facilitate the absorption of the root system.

3. Fertilization

Red bird coral grows quickly in the matrix with sufficient nutrients. If the base Fertilizer is sufficient, Fertilizer does not need to be applied during the growth period, otherwise it will apply a thin Compound fertilizer solution every one month.Dilute the water after fertilization, which is conducive to the absorption of the root system.

4. Pruning

The growth of red bird corals is very strong. In winter, the plant is in a dormant period. At this time, appropriate trimming can be performed;To increase the ventilation of the canopy.

2. precautions for breeding of red bird corals

1. It is best to carry out pots in spring. At this time, it is conducive to the survival of the plant, and it must be carried out in combination with trimming.The top part of the plant should be cut in time to promote branches, and the root ball should be properly trimmed.

2. The common pests in red bird corals are mainly harm of leaf spots, anthracnose, scale insects, and aphids. They are more harmful. They can be cut off when the disease is onset.The loose emulsion solution can be sprayed and controlled.

Third, can red bird coral be raised at home?

Red bird corals can be cultivated at home, but they cannot be placed in small and low places such as bedrooms.Because once it breaks, it will flow out a white liquid with a faint toxin. If you accidentally encounter it, it will cause itching of the Skin. You must rinse with a lot of water. In severe cases, it will cause symptoms such as vomiting and dizziness.Essence

lighting lamp installation method of various lamps for various lamps installation precautions

lighting brand

The installation of lamps in home decoration should be detailed, because it must be used for a long time and cannot be easily damaged, otherwise it will affect family life.Let's take a look at how the lamps should be installed in home decoration.

1. Before installation, the lamps and its accessories should be complete, and there are no defects such as mechanical damage, deformation, paint peeling, and lampshade rupture.

2. According to the installation venue and use of the lamp, the minimum cross section of the wire core of each lamp should meet the requirements of the relevant regulations.

3. When installing electrical lighting devices in the masonry structure, embedded hooks, bolts, screws, expansion bolts, nylon plugs or plastic plugs should be used; wood wedges are strictly prohibited.When the design is irregular, the bearing capacity of the above fixed parts should be matched with the weight of the electrical lighting device.

4. In large risk and special dangerous places, when the height of the lamp is less than 2.4 meters from the ground, a lighting lamps with a rated voltage of 36 volts and below should be used or protective measures are taken.The lamps must not be installed directly on the flammable items; when the surface of the lamp is high -temperature parts*nearly flames, the heat insulation and heat dissipation measures should be taken.In the substation, the high -voltage, low -voltage power distribution equipment and the parent line should not be installed with lamps.The height of the Outdoor installation is not less than 3 meters away from the ground; when it is installed on the wall, the height from the ground should not be less than 2.5 meters.

The wiring requirements of the lamp snail mouth lamp head

1. The wiring should be connected to the terminal of the center contact, and the neutral line should be connected to the terminal of the thread.

2. The insulation shell of the lamp head should not be damaged and leaked.

3. For the light head of the switch, the switching handle should not have a naked metal part.

For ceiling lamps equipped with incandescent bulbs, the light bulbs should not be close to the lampshade; when the distance between the bulb and the insulation platform is less than 5 mm, the heat insulation measures should be taken between the Light bulb and the insulation platform.

The installation requirements of the lamp

1. When the steel pipe is used as a lamp, the inside of the steel pipe should not be less than 10 mm; the thickness of the wall of the steel pipe should not be less than 1.5 mm.

2. The lamp lines of the chain lamp should not be tensile, and the light line should be compiled with the crane.

3. The ends of the soft lines of the soft line chandelier should be used as a protection buckle, and the core wires at both ends should be tin.

4. Lights installed in the same room or place, the heart line deviation should not be greater than 5 mm.

5. The fluorescent lamp and high -pressure mercury lamps and its accessories should be used for use, and the installation location should be convenient for inspection and maintenance.

6. The fixation of the lamp should be firmly available.The screws or bolts for each lamp should not be less than 2; when the diameter of the insulation platform is 75 mm and below, 1 bolt or screw can be used.

Special lighting requirements

Emergency lighting and evacuation instructions used in public places should have obvious signs.Public places without special personnel should be equipped with an automatic energy -saving switch.

Each lamp should be installed on the phase line.The wire of the street light is introduced from the airline, and a waterproof bend should be used at the entrance of the lamp.

36 installation requirements of lighting transformers below

1. There should be short -circuit protection on the side of the power supply. The rated current of the fuse should not be greater than the rated current of the transformer.

2. Any end or CITIC point on the shell, iron heart, and low -voltage side shall be grounded or zero.

lighting requirements fixed on the mobile structure

Its wire should be laid on the inside of the mobile architecture.During the mobile architecture activity, the wire should not be tensile and worn.

When the weight of the chandelier is greater than 3 kg, the embedded hook or bolt should be used; when the soft line chandeliers weigh more than 1 kg, a Hanging chain should be added.

installation requirements of metal halide lamps

1. The installation height of the lamp should be greater than 5 meters. The wire should be connected by the wiring column to the lamp, and the surface of the lamp shall not be available.

2. The lamp Tube must be used with a trigger and a current restricator.

3. A reflective lighting lamps installed on the ground should take protection measures.

installation requirements of decorative lamps embedded in the ceiling

1. The lamp should be fixed on the special framework. The wire should not be close to the lamp case, and there should be a balance in the light box. The frame of the lamp should be close to the ceiling surface.

2. The frame of the rectangular lamp should be parallel to the decoration of the ceiling surface, and its deviation should not be greater than 5 mm.

3. The open lamp lamps of the fluorescent lamp Tube should be arranged neatly, and the interval tablets of the metal or plastic should not be distorted.

The installation requirements of lanterns

The diameter of the diameter of the fixed lanterns shall not be less than the diameter of the lamps and the hook, and shall not be less than 6 mm.For large lanterns, the fixed and suspension device of the crane lamp should be performed by 1.25 times the weight of the lamp.

The glass hood of large lamps installed in large places should take measures to prevent splashing downwards according to design requirements.

installation requirements of neon Lights

1. The lamp Tube should be intact and no damage.

2. The lamp Tube should be fixed for the dedicated insulation bracket, and it must be firmly available.Specialized bracket can be controlled by glass.The minimum distance between the fixed lamp and the surface of the building and the structure should not be less than 20 mm.

3. The length of the lamp for the dedicated transformer for neon Lights shall not exceed the allowable load toxic.

4. The installation location of the neon lamp specialized transformer should be hidden and easy to repair, but it should not be installed in the ceiling, and it should not be touched by non -inspectors.When it is installed, the height should not be less than 3 meters; when it is less than 3 meters, protective measures should be taken; waterproof measures should be taken during Outdoor installation.

5. The secondary wires of neon lamp -specific transformers and the connection between the lamp between the pipes should be used.

6. The distance between the two wires of neon Lights and the surface of the building and structure should not be less than 20 mm.

The installation requirements of chandeliers

For ordinary Hanging wires, if the lighting weight is below 1 kg, it can be lifted directly with a soft guide line and more than 1 kg. If the Hanging chain is lifted, the soft wire should be in the iron chain to prevent the wire from being tensile.

When the soft wire chandelier is buckled in the suspension box and the lamp head.When a sip of the steel pipe as a lamp, the inner diameter of the steel pipe is generally not less than 10 mm.For those who weigh more than 3 kg of lamps, the connection with the ceiling must be hook or bolts that are embedded.Fixed hooks such as fixed steel cannot be less than 6 mm in diameter.

When a fixed large chandelier is hung with a dedicated twist, it should be done: the spiny wheel of the twisted car must have a available locking device; the tensile strength of the twisted steel wire rope should not be less than 10 times the weight of the lanterns.The installation of the lamp must be anti -shock.When the metal shell of the lamp must be grounded, the ground bolt should be connected to the ground network.

When the lamp uses the screw -mouth lamp head, the phase line should be connected to the top of the lamp head, and the screw mouth is connected to the screw.The garden light should be installed with a fuse.Install lamps must be burned.When a variety of lamps are in the flammable structure or installed in a wooden ceiling, fire prevention or heat insulation should be performed around the lamp.Boured tungsten lamps cannot be installed on wooden or other flammable materials.Install lamps to make itself line with the indoor building lines.The side of the rectangular lamp should be parallel to the decoration of the ceiling.When the lamp is installed symmetrically, its vertical and horizontal central axis should be on the same straight line.Multi -mounted opening lamp lamps.The arrangement of the lamp should be neatly arranged.

precautions for installation of lamps

First of all, the most basic requirement of lamp installation is to be firm.

When the bedside lamp, table lamp, mirror front lamp, floor lamp, Wall lamp, etc. are installed in the room, the height is less than 24m and below. The metal shell of the lamp should be reliable to ensure the safety of use.A ground wire should be added at the lamp box during the wiring.

When installing various types of lamps, the installation instructions should be installed according to the requirements of the lamp.In addition, the dark line in the ceiling or wall plate must be protected by flame retardant sleeves.When the lighting weight is greater than 3kg, it should be installed with embedded hooks or directly fixing the sling frame from the roof (the lamps cannot be installed with a Hanging top keel bracket).The wire application hose led to the light head box box is protected to the lamp to prevent the wire from being exposed to the flat top.

When the bathroom and the kitchen are equipped with short -feet lamp heads, the porcelain snail mouth is short.The wiring and phase line (switch line) of the threaded lamp head shall be connected to the central contact terminal, and the zero wire is connected to the threaded terminal.

The most important and basic and most basic in the installation process: the lamp head with switching and other switches. For safety, the opening handle should not have a naked metal part.

maintenance of lamps

lighting must be used at the scheduled voltage and frequency.

All ground lamps must be checked frequently.

Special restrictions and specified lamps are generally used when the ambient temperature is 5-35 C.

The lamps used indoors cannot be moved outdoors.

Electrical, gas, kerosene stoves and other heater or their components or places directly encounter steam should not be used.The lamp cannot exceed the specified lamp.When changing the Lights and disassembling the cover and the fuse, the power must be cut off.

Safety lighting lamps should be checked to ensure that no abnormalities occur.

The accident lamps cannot be used after the Lights are urgently turned on at high temperature gas (140 degrees Celsius), and new lamps should be replaced.

Do not place paper and cloth such as near the Lights or cover the lighting.

There must be no places to repair lamps with dangerous objects such as gas and steam, but should be carried out in general places; when not in progress, safe operation must be guaranteed.

Wipe the lamps with warm water scrubbing or worting soapy water. Do not scrub with gasoline and volatile oil.

The metal part of the lamp cannot be used at will.

The dust behind the lamp should be cleaned with a dry cloth or dumplings.

When abnormal conditions occur during the use of lamps, use it to stop using, cut off the power, and check.