400 divided by 2

1. 1. The meaning of CPU calculation once is that CPU performs "bit calculation" once, for example, 2 + 3 = 5, and binary is 0010 + 0011 = 0101. If there are three bits in total, the computer will calculate three times. 2. As for what this number is related to, that is, the higher the CPU frequency, the more the number of operations per unit time

2.

1、 mining principle

at the beginning, we could dig bitcoin with the computer CPU. The founder of bitcoin, Nakamoto Tsung, g out the world's first creation block with his computer CPU. However, the era of CPU mining has long passed, and now bitcoin mining is the era of ASIC mining and large-scale cluster mining

looking back on the mining history, bitcoin mining has gone through the following five times: CPU mining → GPU mining → FPGA mining → ASIC mining → large-scale cluster mining, The mining speed changes are as follows:

CPU (20mhash / s) → GPU (400mhash / s) → FPGA (25ghash / s) → ASIC (3.5tash / s) → large scale cluster mining (3.5tash / s * x)

mining speed, which is called computing power in professional terms, that is, the ability of computer to generate hash collisions per second. In other words, how many hash collisions can our miner do per second is the calculation force. Computing power is the ability to dig bitcoin. The higher the computing power, the more bitcoin you dig, the higher the return

in the world of bitcoin, a data block is recorded about every 10 minutes. All mining computers are trying to package the data block and submit it, and the person who successfully generates the data block will get a bitcoin reward. Initially, bitcoin rewards of 50 bitcoins could be generated about every 10 minutes. But the payment is halved every four years, and now the bitcoin network can generate 25 bitcoins every 10 minutes

to successfully generate data blocks, miners need to find the effective hash value. To get the correct hash value, there is no shortcut. You can only guess. The process of guessing is the process of computer random hash collision. If you guess correctly, you will get bitcoin

Mining method: from a miner to a large-scale mine, you need to prepare a miner, a computer that can connect to the Internet, an AUC, a raspberry pie, power supply and all kinds of connecting lines, etc. The connection order of various devices is network cable - & gt; Raspberry pie - & gt; Microusb cable - & gt; AUC-> 4Pin cable - & gt; Mining machine and power supply

< EM > Figure 3: Mine Map (scale of tens of thousands of mining machines) < / EM >

nowadays, the profit space of small and medium-sized absenteeism who take one mining machine home or deploy a small family workshop (dozens of mining machines) is very limited, and the mining instry is graally concentrating on enterprises and teams with low-cost power resources and professional deployment ability

there are many factors that affect the mining revenue, such as the performance and power consumption of mining machinery, the computing power and difficulty of the whole network, the deployment and operation and maintenance capacity of the mine, the availability of low-cost electricity resources, and the currency price and policy guidance, etc. At present, excellent mining enterprises have the ability of chip research and development, a lot of computing power, professional mine deployment and operation experience, etc. in the future, resources and computing power will be more and more concentrated in these mining enterprises

2. Mine pool

in addition to the above equipment, you also need a necessary tool - mine pool. The function of the mine pool is to gather a large amount of mineral computing power, increase your probability of getting bitcoin, and at the same time, distribute your future bitcoin income to your account in advance

the simple explanation is as follows: now the bitcoin network generates a block every 10 minutes, which contains 25 bitcoins. Suppose there are 1W people in the world participating in mining, then in these 10 minutes, only one lucky person has taken these 25 bitcoins, and the others have nothing. The principle of the mine pool is that everyone mines in teams and distributes according to the agreed distribution method, so that the income of the miners' bitcoin tends to be stable and the risks of the miners are reced. Let's take the most common PPS allocation method as an example. Suppose that your computing power is 10t, and the computing power of the whole mine pool is 100t. Your computing power accounts for 1 / 10 of the total computing power of the mine pool. Suppose that the mine pool can generate 10 bitcoins a day, then you can get 1 bitcoin a day

3. Cloud computing power

in reality, the supply of mining machines often exceeds the demand, and at the same time, the delivery of mining machines needs a long waiting period. Miner installation, commissioning, maintenance and other processes are very complex, which requires a lot of energy. Miners have to enre the noise and heat of miner. For miners, the biggest cost is not these, but the high electricity charges consumed by mining. The profit space of small and medium-sized miners is getting smaller and smaller, even negative

Mining income and risk mining income can be calculated by the following formula:

Mining income = generated bitcoin * currency price - mining machinery cost - electricity fee - custody fee

if you are just a small miner, generally you only need to dect mining machinery cost and electricity fee

Mining risks are as follows:

< UL >

at present, the number of bitcoin is less than 4.5 million. If we do not issue additional bitcoin, the price of bitcoin will fluctuate, and the price callback will lead to the extension of the payback cycle

mining difficulty improvement at present, our machines can meet the market demand

the risk of power outage

< UL >

< EM >
< / EM >

3. 0.03 bitcoin, about 17 yuan

4. Hello, you should be talking about the so-called computing power of some blockchain platforms. Now, the algorithms of these platforms are uneven. The real blockchain platform in China is actually zero. This computing power is calculated according to the user's activity and some other statistical rates.

5. No, the CPU of a mobile phone is an embedded CPU. Its instruction set is simplified (that is, its function is simple). Although the speed is faster and faster, it is not the same concept as a computer. Or you can understand it from the aspect of energy (a computer uses so much electricity as a mobile phone, so what's the computer for.

6.

On June 21, 2019, xinbaojun mobile Internet of vehicles media sharing meeting was held in Nanjing. The first Internet of vehicles without mobile phones shocked everyone

the driving role of the Internet of vehicles technology in the automotive field has been significantly strengthened, which promotes the development of the automotive field. This is the growth space of related instries represented by the Internet of vehicles. After that, with the development of mobile Internet, the arrival of big data, Internet of things technology and new technology, it has brought more growth opportunities to the Internet of vehicles

some people say that with the advent of the era of Internet of vehicles, the curtain of artificial intelligence such as driverless, remote control and VR / AR has really opened. For us, the world is full of unknown and hope

in the final analysis, the arrival of the Internet of vehicles is still the competition of hard power and high technology

7. It should be calculated that half of the force is saved at the end of the movable pulley
when the force at both ends of the rope is calculated, it should be calculated as 100
not
∵ the movable pulley is actually a lever
power arm × Power = drag arm × Resistance
and pull up vertically in the moving pulley, the power arm is equal to the resistance arm
if the maximum bearing force is the power, then the power is equal to the resistance
the material weight is equal to 1 / 2 of the power + resistance
so the maximum bearing force of the rope on the moving pulley should be calculated, which saves half of the force on the other end of the moving pulley

8. The second question: in a period of rotation 2 Wu, of which 8 / 9 Wu in the magnetic field. And in the magnetic field is equivalent to a uniform magnetic field, so when in the magnetic field, there is no difference with the level of uniform motion in the magnetic field, subject to constant ampere force. So we don't use the effective value, and this current can't be called the maximum value, as long as the current is within 8 / 9 of the current. Third question: this equation is the formula for calculating the effective value, that is, I & # 178; RT = I, there are 178; RT t is the period and t is the rotation time in the internal magnetic field. If you are just beginning to learn alternator, take a good look at the textbook. If you are in senior three, you may not understand it at that time, but it doesn't matter. Come on

9. How to further improve students' computing ability, teachers, good morning: today I take this opportunity to exchange with you: in the review, how to further improve students' computing ability. When it comes to this topic, teachers will feel that it is just a matter of old talk. I think the more we grow up talking about things, the closer it is to our lives. The new curriculum standard also emphasizes that: to improve students' computing ability is helpful to establish students' mathematical literacy, to cultivate students' ability to solve problems, and to establish students' quality of being serious, meticulous, patient and fearless of difficulties. It can be reflected from the examination papers in recent years, especially last year, almost half (even 3 / 5) of the students in each class made mistakes in the calculation. What makes the teachers feel more sorry is that in the practical problems, the students managed to sort out their ideas, but they still fell down in the calculation. How to improve the calculation ability of students and let them calculate correctly, quickly, reasonably and flexibly? I will talk about my practice from the following six aspects: first, to cultivate the ability of oral arithmetic and lay a solid foundation. In my usual teaching, I pay great attention to observe the students who are slow in homework, whether they do not master the method or have difficulties in calculation. At this time, I found that there are still quite a number of students who add and subtract within 20, such as 7 + 15, 13-8 and so on, as well as simple integration and quotient, such as 13 × 2、60 ÷ Second, they have to list the vertical formula to calculate. What a waste of time! Therefore, to improve students' computing ability, it is very important to lay a good foundation for oral arithmetic. 1. We should pay attention to mastering the method of oral arithmetic. For example: using the composition of numbers to calculate the addition and subtraction method within 10; Use the rounding method to calculate the carry addition within 20; The reciprocal of addition and subtraction is used to calculate the abdication subtraction within 20; The multiplication formula is used to calculate the proct and quotient directly; According to the law of operation for oral calculation, etc. 2. Pay attention to the characteristics of mental arithmetic. For example: 398 + 45, you can take 398 as an integer of 400, add 45, and then subtract the extra 2, so that the heart and mouth can be united, and the calculation will be fast and accurate. I think this is very important, but it's very difficult for our students to do it. They always start to do it as soon as they get the topic. They always think it's unnecessary to observe and it's a waste of time! Here, our teachers should pay special attention to asking questions frequently, reminding frequently and strictly controlling. 3. Do a variety of mental arithmetic exercises. As we all know, the calculation problem has no vivid plot, so it is difficult to attract students' attention. Therefore, the only way to fully mobilize the enthusiasm of students is to have a variety of forms when practicing oral arithmetic. There are many forms of exercises, such as self arithmetic (looking for oral arithmetic problems in the textbook, and seeing how many courses you can count correctly within the specified time), mutual arithmetic (students work out questions and judge each other), oral arithmetic competition, rush answer competition, relay race, etc. these forms are lively and students like them very much. 4. Constant training. As the saying goes, if you want to develop a good skill, you must keep your fists together and keep your tongue in tune. So is the cultivation of oral arithmetic ability. It's a cumulative process, so I train every day according to different training contents, using noon counseling or 3-5 minutes before class. In our class, 20 courses of oral arithmetic training every day has become a habit of students. Only in this way can we achieve the ideal effect. 2、 Participate in the derivation of rules and formulas, and truly clarify calculation. In the process of students mastering calculation rules and formulas, I think we should try our best to guide them to practice and use their brains, and through their own practice, observation, and active exploration, so that they can have a deeper understanding of the process of acquiring knowledge. For example, when calculating the volume of a cone, many students tend to lose one-third of it. In teaching, I pay attention to guiding students to use the learning tools in their hands, and everyone can participate in the experiment. They can not only remember their own conclusions, but also use them freely.