What is the difference between a crawler tractor and a crawler tractor? Zyo6 type track shifter is a special equipment for railway line maintenance track shifter and track shifter. The machine is mainly composed of power and operation, walking and lifting, hook, starting track, frame and next track. It has the characteristics of simple and compact structure, simple and flexible operation, convenient use and maintenance, fast and reliable access and so on.
The invention overcomes the shortcomings of the original portable small hydraulic track lifting machine, such as small track lifting force, small track lifting amount, high labor intensity of operators, low working efficiency and difficult guarantee of working quality. It plays an important role in occasions where large tamping vehicles are not needed or the operation is inconvenient. It can automatically control the amount of track start and track setting, greatly improve the efficiency and accuracy of railway line leveling, and is especially suitable for large and medium-sized maintenance, new construction and reconstruction and expansion projects of railway lines.
What is the difference between fan coil unit, ceiling air conditioner and air-cooled heat pump pipeline machine? The main components of these three things are heat exchanger and fan. The heat exchange medium is liquid, which exchanges heat and cold with indoor air.
Water flows in the fan coil and ceiling air conditioner heat exchanger, and the water is supplied by the freezing station (boiler room); Supply cold water in summer and hot water in winter; Ceiling air conditioning can also be regarded as a large fan coil with larger circulating air volume and larger heat exchange area.
Refrigerant flows in the heat exchanger of pipeline machine and is supplied by the outdoor unit of air-cooled heat pump. The low-temperature and low-pressure refrigerant liquid supplied in summer absorbs heat and evaporates in the heat exchanger to become low-temperature and low-pressure vapor, and then returns to the compressor of the outdoor unit for recompression; In winter, the high-temperature and high-pressure refrigerant vapor is transformed into high-temperature and high-pressure refrigerant liquid through heat dissipation in the heat exchanger, and then returns to the outdoor unit, absorbs heat and vaporizes in the evaporator, and then returns to the compressor for recompression. That is, the heat exchanger of indoor unit of air-cooled heat pump pipeline machine is evaporator in summer and condenser in winter, and the heat exchanger of outdoor unit is condenser in summer and evaporator in winter.
What is the difference between the indoor unit of VRV system and the water-cooled fan coil unit? Simply put, the refrigerant used in VRV indoor unit is Freon, etc., and the cooling medium used in fan disk is water.
The structure and type are similar, and the installation method is not very different.
What's the difference between air-cooled air cooler and water-cooled air cooler? Cooling tower is used for water cooling, and fan is used for air cooling.
Does the return air of the air-cooled pipeline machine affect the temperature? The temperature difference varies with the refrigeration capacity of the compressor. When the refrigeration capacity is small, the temperature difference between the return air temperature and the outlet air temperature becomes smaller.
For example, when the inverter air conditioner reaches the set temperature, the compressor is implemented by reducing the frequency and power, and the refrigeration capacity at this time is equal to the indoor heat load demand.
If the indoor heat load is small, the air conditioner will reduce the indoor temperature without a lot of refrigeration, and the temperature difference between the return air temperature and the outlet air temperature is small.
What is the difference between CPU heat pipe radiator and air cooling/heat pipe radiator? What I just introduced to netizens is that the one above you is not bad, and the price is very real.
Air cooling, heat pipe cooling, the focus is not on heat conduction. The thermal conductivity of air cooling is not very strong. Heat pipes have stronger thermal conductivity. If I heat this end with a lighter, I light it for 5 seconds, and then I put my hand where it was just lit. Actually, it's not hot at all The whole temperature is the same. I used this to test and play tricks on others.
Can brass tube be used as computer water cooling tube? It can't be said that it is impossible, because there are too many experts in the world, but personally, it is better to use metal pipes. The reason is that copper pipe will have better sealing effect than brass soft joint (referring to threaded joint). Brass is a copper alloy with relatively high hardness. If you have to use it, it is best to add a gasket to the joint, but it likes to risk aging and leakage. I hope it helps you.
What are the three pipeline mechanisms of linux? In addition to the core program, the operating system needs other system programs and applications to be practical. Most of the system programs commonly used in Linux system are developed by the Free Software Foundation of the United States, and many organizations or individuals develop applications for Linux. Most of these programs are free software. Anyone can get these programs online for free, but it is very inconvenient to get and install them one by one. So some companies or institutions will collect and integrate programs on Linux to form a complete operating system, so that ordinary users can easily install the whole system, which is called "distribution". The Linux system we generally talk about is aimed at these installation packages. It is also a Linux system, but it is divided into different installation packages integrated by different companies and institutions. This is why we often see so many "kinds" of Linux on the Internet.
Linux has the programming interface and running mode of Unix system, and it also inherits the characteristics of stability and efficiency of Unix. It is common for a host with Linux installed on the network to run continuously for more than one year without crashing or shutting down. But Linux doesn't need to bear huge copyright fees like Unix, and it doesn't need to be used on exclusive expensive hardware. Linux can be efficiently executed on ordinary i386 PC. It naturally receives the program resources and users accumulated on Unix in the past few decades. In addition, the copyright of GPL allows everyone to freely distribute the source code of Linux and modify the program according to their own needs, which makes Linux a very popular multitasking, free, stable and efficient, and can be used in many different ways, including i386, Sparc, Alpha, Mips, PPC and so on.
Linux supports various hardware devices, such as x86, Motorola 68k, Digital Alpha, Sparc, Mips, Motorola PowerPC and ARM. Because the code is open, hardware manufacturers can develop drivers suitable for Linux for their own hardware devices without paying extra copyright fees, thus improving the sales rate of products.
Software, such as X, is the industrial standard of Windows system; In addition, Emacs, led by Richard Stroman, provides a document editing environment in both windows and text versions, with complex and powerful functions and a complete set of online description files. The spreadsheet jointly developed by everyone is a spreadsheet in Windows. Anyone familiar with Lotus 1-2-3 will be inexplicably moved to see such fruitful results. Of course, the most admirable thing is the network capability of Linux. Whether it is SLIP, PPP, NetBEUI, DDP, X.25 or ISDN, Linux has corresponding software supply. And the stable server function is suitable for establishing Intra and Inter.
General users benefit from the protection of GNU GPL and LGPL, and can obtain complete Linux through different channels, so Linux can be "free". Compared with the high copyright cost of Unix, Linux is cheap and good.
In addition, Linux has the following features:
Multitasking: This means that Linux can meet the personal needs of many people at the same time. Figuratively speaking, you can listen to the soundtrack CD of Titanic, edit and print documents at the same time, and play Tetris X version at any time.
Supporting multi-CPU:↓: This is definitely not the patent of nt, and Linux also supports this hardware architecture, which means that faster computing and revolutionary algorithms will soon become the mainstream of the times.
RAM protection mode: processes will not interfere with each other, ensuring that the system can run for a long time without errors. According to many people downloading benchmarks to test the performance of Linux, it is found that the performance of a single PC with 486CPU is equivalent to that of Sun or Digido's intermediate workstations.
Dynamic loading program: When the program is loaded into ram for execution, Linux only loads the relevant program modules in the disk, which effectively improves the execution speed and ram management.
Dynamic link * * * sharing library: This means that the size of executable files is greatly reduced, which helps to save disk space.
Support a variety of file systems: such as Minix, Xenix, System V and other famous operating systems. Ntt NTFS will be supported in the future.
Visible DOS: this is the so-called transparency; The FAT file system of DOS is considered as a special remote file system, which can be used flexibly without any special instructions, just like a directory existing under Linux.
Development of Linux
With the development in recent years, Linux has become another big rival of Microsoft and Shengyang. Linux, with its competitive advantages of low price, high quality and stability, is spreading invisibly to many PC-based working platforms. In the early days, due to the lack of commercial application software, relying solely on tools and programs with strong academic atmosphere could not enter the mainstream operating system of ordinary businesses. However, today's Linux is no longer Amunwu, and plans such as, Gimp and Gnome have been launched one after another, providing X with more desktop operating environments and application software with graphical interfaces.
Around 1993, Linux first appeared as a distribution. This is a complete set of software, including installer, kernel, application software, X, driver and other software packages. , download to disk through Inter for installation. At that time, the installation procedure was relatively simple, and it was difficult to install successfully. The biggest obstacle is the lack of interface affinity and poor hardware support.
Later, the CD-ROM appeared, and the medium CD-ROM came into being. Now the distribution software produced by Linux vendors also uses this as the main distribution medium. There are three common types in China: Red Hat, Slackware and Debian. Among them, Debian is a heavyweight distribution software, which still remains non-commercial, and FSF used funds to assist its initial development. Anyone can download the whole distribution software from Debian's FTP site. Of course, commercial organizations like Red Hat can download software from FTP sites, but if you spend a little money on CDs, you can get extra technical support and useful documents.
The easiest way to get these CDs is to buy books about Linux. No matter whether these books are in Chinese or English, a distribution software made by a company or organization will be attached to the back of the books. There will be a special chapter in the general book to explain the process of installation and setting, so readers can make good use of it. Different distribution software has different installation mechanisms, but they are all Linux.
For domestic users, they are most concerned about the development of Chinese technology in Linux. The stable Chinese version of X Windows system has been released, and various Chinese input methods and Chinese simulation windows have also entered a mature stage. I believe that it will develop towards the cultural level of application software in the future, so that the operating environment of X can meet the needs of domestic users.
Application of Linux
Without commercial activities, there would be no Linux；; Without the awareness of freedom of information, there can be no Linux.
Linux is not only an excellent software development platform, but also a good partner for work and family. Some people say, "With Linux, we have the magic lamp of Allah." This statement is correct. Others said: "Software that has not been ported to Linux up to now is definitely worthless." This is not bad.
The development of Linux confirms the trend that information will become cheaper and cheaper. Because it is cheap, the market will expand infinitely. Business activities have also turned to a service-oriented model. The most direct case is the application of ISP.
Linux can be used to set up ISP!
SSC (Specialized System Consultants), the publisher of Linux Journal, takes Linux as the network dial-up service platform. To become an ISP, you need to have the ability to connect to the Internet, multi-sequence dialing services (such as software systems provided by companies such as Cycades, Maxspeed, Gtek, etc.), PPP and SLIP services, and use newsgroups (such as INN), email sending (such as sendmail), web servers (such as Apache), backup functions (such as tar, cpio) and other application software. From this observation, the main control cost will fall on the internet communication rent, and the cost of investing in Linux is very low.
What is the difference between a water purifier and a water purifier? First of all, the concept is different.
1 water purifier: chlorine gas in urban tap water, bacteria, viruses, colloids, rust, impurities and other harmful organic pollution caused by secondary pollution are removed by physical means such as filtration and adsorption.
Water purifier: All organic pollutants and inorganic ions in water are intercepted by RO membrane reverse osmosis with ultra-fine precision, and there is a certain amount of wastewater. The effluent is pure water, which can be directly drunk.
Second, the characteristics are different.
1 water purifier: activated carbon, meltblown filter element, microporous ceramics, hollow fiber, KDF, etc. Most of them are used to purify water, and the filter element needs to be replaced and maintained regularly, so it is impossible to remove calcium and magnesium ions from water, that is, it is impossible to solve the problem of water and alkali.
Water purifier: it has the advantages of removing harmful organic pollution such as bacteria, viruses, colloids, rust and impurities, and it also has the advantage of removing scale with a water softener.
Third, comparison of advantages and disadvantages
1 water filter
A advantages: removing harmful substances in water, retaining minerals and trace elements beneficial to human body, drinking raw, without power supply and waste water.
B. Disadvantages: water and alkali cannot be removed. If you want to remove it, you need to increase the configuration and replace the filter element.
2 pure water machine
A. Advantages: the removal rate of impurities in water is as high as 96% or more, with good taste and pure and sweet water quality.
B. Disadvantages: there is wastewater discharge, and the water output is small, which is not suitable for domestic water. The filter element needs to be replaced regularly. For every liter of water used, 3 liters or more water needs to be discharged. The water purifier purifies the water thoroughly, so the human body needs less minerals and trace elements.