What does the distance behind the global forecast system mean

Using the "Climate Simulation Best Estimate" (CMBE) observation dataset produced by the American Atmospheric Radiometric Project (ARM), the vertical distribution of atmospheric temperature, relative humidity and cloud cover forecast by the National Center for Environmental Prediction (NCEP) Global Forecast System (GFS) at the Arm Southern greatest plains (SGP) site in 2001 and 2008 is examined, and the main conclusions are as follows: (1) NCEP GFS provides a good forecast of seasonal changes in temperature and relative humidity. In terms of the average of each season, NCEP GFS overestimated the atmospheric temperature and underestimated the atmospheric temperature below 13 16 km in spring and winter and below autumn and winter, and the absolute value of temperature deviation at each altitude was less than 1. The NCEP GFS forecast results reproduce the observed bimodal structure of the vertical distribution of relative humidity, but overestimate the relative humidity at 4 12 km.

The increased model resolution (T170L42 updated to T254L64) significantly improved the forecast of relative humidity at 14 18 km. (2) The predicted cloud cover is less than the observed value below 10 km and higher than the observed value at 10 13 km, and the cloud cover of non-precipitation low clouds is not predicted by NCEPGFS, and the cloud cover of the predicted precipitation clouds is lower than the observed value below 8 km, reflecting the lack of activity of shallow and deep convective activities in the NCEP GFS model. (3) The NCEP GFS model uses the predicted relative humidity and cloud-water-cloud-ice mixing ratio (QC) to diagnose cloud cover, and the same diagnostic formula is used to calculate the cloud cover from the observed relative humidity and the QC output of the NCEP GFS forecast, and the cloud cover obtained is more significantly smaller than the observed value at all altitudes below 11 km, that is, it is more serious than the underestimation of cloud cover by NCEP GFS, indicating that NCEP GFS may have underestimated the QC of this altitude range

4) The temperature, humidity and cloud cover forecasts of NCEP GFS from 2001 to 2008 were not significantly improved, and the errors of cloud cover and QC were likely to be related to the uncertainty of deep and shallow convection schemes and stratus microphysical schemes in the model.

What is the significance of the development of the world's fastest computer, Tianhe-2.

It's too high quality to understand.

This means that it is the distance traveled by the car at a certain initial velocity, from the time the driver presses the brake pedal sharply to the time when the car comes to a complete stop.

The braking regulations of various countries stipulate the braking distance of various models at the specified muzzle speed. Vehicles that exceed this distance are not qualified vehicles and cannot be driven on the road. One of the most important indicators for traffic authorities to inspect vehicles is the braking distance.

China's requirements for the braking distance of the car (when unloaded) are:

1. When the initial speed of a passenger car with no more than nine seats is 50km h, it shall not exceed 19m;

2. When the initial velocity of the car does not exceed 50km h, it does not exceed 21m;

3. For other cars, when the initial speed of the car train is 30km h, it does not exceed 9m.

Control ---, --- rotation. Braking --- control to turn --- brakes.

When driving a vehicle, brake according to the speed, road conditions, load conditions, and braking performance. If you practice a lot, you'll get to grips with it.

GPS is an abbreviation for Global Positioning System, which is a satellite-based positioning system used to obtain geolocation information as well as accurate universal coordinated time.

The system consists of 24 satellites placed in orbit by the United States**. GPS provides navigation with an accuracy of less than 10 meters. It works anywhere in the world, in any weather conditions.

There are no subscription fees or installation fees to use GPS. The system is operated by the United States**, and its accuracy and maintenance are also fully responsible for the United States**.

Global positioning system.

GPS is the abbreviation of Global Positioning System in English.

1.Covers the world's surfaces and can operate around the clock2It has many functions and is widely used3The observation time is short, and the positioning accuracy is high4Simple to operate and easy to carry5Good anti-interference performance and strong confidentiality.

The weakness of the national satellite positioning system is that the power is limited, but the positioning time is short and the accuracy is high.

GPS is the abbreviation of Global Positioning System. The system is a second-generation satellite radio navigation system deployed by the United States. It is to deploy 24 GPS special satellites over the earth, and the satellite orbit, that is, the precise position of each moment, is determined by the ground monitoring station, and transmitted to the ground with radio waves through the satellite; The GPS receiver on the ground receives more than 4 satellite signals at the same time, and the ground point position is obtained according to the precise position of the satellite.

It can provide users with global, all-weather, continuous, real-time, high-precision three-dimensional coordinates, three-way speed and time information. GPS has the characteristics of high accuracy, fast speed, all-weather, and long distance, which greatly expands the role of geodesy. Its role can be summarized as follows:

Provide positioning and navigation information for aircraft, ships and carriers; The deployment of various control networks such as cities, mines, and oceans does not require standard observation, and can meet the needs of economic construction and national defense construction flexibly, conveniently and cheaply; The ground monitoring network can be deployed to monitor geodynamic phenomena such as crustal deformation, plate movement, solid tide, and sea level rise and fall. It can be used to demarcate national borders, maritime boundaries and joint survey of coastal islands; It is used to establish a geocentric coordinate system with the Earth's center of mass as the origin of the coordinate system, and provides information for the establishment of a geodetic reference frame. Refining the geoid using GPS and leveling data; GPS observations can be applied to known points to invert meteorological elements in the troposphere of the atmosphere, etc.

The meaning of global satellite positioning, there is an explanation of this system above, so I will talk about its impact on your use of cars.

First of all, you can use GPS to find the best way to go, the best driving route.

And if your GPS system is with the anti-theft system, it can determine the location of the vehicle when the vehicle is stolen, which has the effect of anti-theft.

GPNAV! ~

Manage distance.

Abbreviation: AD Management Distance refers to the routing confidence of a routing protocol. Each routing protocol is assigned a trust level in order from high to low reliability, which is called the management distance.

For routing information from two different routing protocols to one destination, the router first decides which protocol to trust based on the management distance. The lower the AD value, the higher its priority. A management distance is an integer value from 0 to 255, with 0 being the most trustworthy and 255 meaning that no traffic will pass through this route.

ad=0 for direct connection, ad=1 for static, ad=90 for EIGRP, ad=100 for IGRP, ad=110 for OSPF, and ad=120 for RIP

In addition, the management distance value can be set manually.

For example, the default management distance of a static route is 0 and the RIP is 120.

The depth of the water layer that falls from the sky to the ground, and the depth of the water layer that accumulates on the surface of the water without evaporation, infiltration, or loss, is called rainfall (in millimeters), which can visually indicate the amount of rainfall. At present, the commonly used instruments for measuring rainfall include rain measuring cylinders and measuring cups. The rain gauge is generally 20 cm in diameter and contains a funnel and a bottle.

The measuring cup has a diameter of 4 cm, and it is used with a rain gauge. When measuring, pour rainwater from the rain scale into a measuring cup, and you can know the amount of rain for the day according to the scale on the cup.

The China Meteorological Administration stipulates that the rainfall within 24 hours is called the daily rainfall, and the daily rainfall is less than 10 mm is called light rain, millimeters are moderate rain, millimeters are heavy rain, heavy rain is millimeters, heavy rainfall is millimeters, and more than millimeters are called extremely heavy rainfall.

Due to the vast territory of our country, a small number of areas have other provisions according to the specific conditions of the province. For example, in the rainy Guangdong, the daily rainfall of more than 80 mm is called heavy rainfall; In the Yan'an area of Shaanxi Province, where there is little rain, the daily rainfall of more than 30 mm is called heavy rainfall.

If you don't have a rain gauge handy, don't worry, you can make your own with some common utensils, and the results are quite good. Take a disposable plastic or paper bowl with a diameter of 20 cm (a suitably sized instant noodle paper bowl is optional), cut a small hole slightly larger than a corn kernel in the bottom, and place the bowl on a jar without a lid. There is a glass bottle inside the jar, and the mouth of the bottle is connected to a small hole in the bottom of the bowl.

The simple rain gauge is ready. Once the simple rain gauge is ready, it can be placed at a height of 70 cm above the ground (the distance between the mouth of the cylinder and the ground) to receive rainwater. When the rain stops, weigh the water in the bottle on a scale, and 30 grams of water is equivalent to 1 millimeter of rainfall.

It's rainfall, which is measured by the total area of the whole area.

It is an electrical term, specified in GB T2900.

Clearance clearance The shortest straight-line distance between two conductive parts.

Creepage distance is the shortest distance along the surface of the insulating material between two conductive sections.

It has to do with the voltage level.

Creepage distance, as I understand it, is: voltage breakdown distance. Namely:

When a certain voltage is added between the two electrodes, creepage (electrical breakdown) occurs. Or at a specific voltage, adjust the distance between the two electrodes until the creepage phenomenon occurs, which is the creepage distance. Clearance, generally refers to the distance between two electrodes, safe and high-voltage resistance.

Difference: The former is the limit distance, the latter is the safety distance, the safety distance, generally take 1 2 or 4 of the limit voltage, the smaller the ratio, the safer. It is also possible to take 2, 3 or 4 times of the creepage distance on the basis of the known creepage distance, and the larger the multiple, the larger the gap, the less creepage can occur.

Creepage distance refers to the distance from the live part along the surface of the insulating support to the grounded part, and the clearance is the straight-line distance from the live part to the grounded part.