0 computing power

1. According to the data of spider mine pool:
BTC full network computing power 153.280eh/s, mining difficulty 21.72t, current block height 672055, theoretical income 0.00000690/t/day
the total network computing power of eth is 418.403th/s, the mining difficulty is 5380.94t, the current block height is 11923460, and the theoretical profit is 0.00709464/100mh/day
BSV network computing power is 0.544eh/s, mining difficulty is 0.08t, current block height is 675889, and theoretical income is 0.0081/t/day
BCH's whole network computing power is 1.596eh/s, mining difficulty is 0.20, the current block height is 676209, and the theoretical profit is 0.00056395/t/day<

the Xueshuo innovation blockchain Technology Workstation of Lianqiao ecation online is the only approved "blockchain Technology Specialty" pilot workstation of "smart learning workshop 2020 Xueshuo innovation workstation" launched by the school planning, construction and development center of the Ministry of ecation of China. Based on providing diversified growth paths for students, the professional station promotes the reform of the training mode of the combination of professional degree research, proction, learning and research, and constructs the applied and compound talent training system.

2. It is puzzling to ask questions, highlighting the weak cultural foundation of the subject
what kind of computing power is it? Mining, video coding, or game rendering
as a low-end game graphics card, how can its computing power in game rendering be zero
it's impossible to think about it with your toes or buttocks.

3. Lidar is a kind of remote sensing measurement which uses laser as light source and detects the light wave signal without interaction between laser and detected. The lidar technology using vibration Raman technology is Raman lidar, which is mainly used for atmospheric remote sensing measurement. Raman lidar is a kind of remote sensing technology. As an active remote sensing detection technology and tool, lidar has a history of nearly 50 years. At present, it is widely used in Earth Science and meteorology, physics and astronomy, biology and ecological conservation, military and other fields. Among them, the traditional lidar is mainly used for land vegetation monitoring, laser atmospheric transmission, fine weather detection, global climate prediction, marine environment monitoring and so on. With the rapid development of laser technology, fine spectroscopic technology, photoelectric detection technology and computer control technology, lidar has unique advantages in remote sensing detection height, spatial resolution, time continuous monitoring and measurement accuracy
lidar is a radar system that detects the position, velocity and other characteristics of the target by emitting laser beam. In terms of working principle, there is no fundamental difference with microwave radar: transmitting the detection signal (exciting beam) to the target, and then comparing the received signal (target echo) reflected from the target with the transmitted signal, after proper processing, the relevant information of the target can be obtained, such as the target distance, azimuth, altitude, speed, attitude, even shape and other parameters, so as to realize the target detection Missile and other targets are detected, tracked and identified. According to different detection technologies, lidar can be divided into direct detection type and coherent detection type. According to different functions, it can be divided into tracking radar, moving target indication radar, velocity measurement radar, wind shear detection radar, target recognition radar, imaging radar and vibration sensing radar
the working principle of lidar and radio radar is basically the same, and depends on the detection technology used. The basic structure of the direct detection lidar is quite similar to that of the laser rangefinder. When working, a signal is sent by the transmitting system, which is collected by the receiving system after being reflected by the target, and the distance of the target is determined by measuring the round-trip propagation time of the laser signal. As for the radial velocity of the target, it can be determined by the Doppler frequency shift of the reflected light. It can also be obtained by measuring two or more distances and calculating the rate of change
coherent detection lidar can be divided into monostable and bistable. In the so-called monostable system, the transmitting and receiving signals share one optical aperture and are isolated by the transmitting receiving switch. The bistable system consists of two optical apertures for transmitting and receiving signals respectively. The transmit receive switch is no longer needed, and the rest is the same as the monostable system
lidar is a combination of laser technology and radar technology. It consists of transmitter, antenna, receiver, tracking rack and information processing. The transmitter is a variety of lasers, such as CO2 laser, Nd doped yttrium aluminum garnet laser, semiconctor laser and wavelength tunable solid-state laser; The antenna is an optical telescope; The receiver uses various types of photodetectors, such as photomultiplier tubes, semiconctor photodiodes, avalanche photodiodes, infrared and visible multi detector devices, etc. Lidar uses pulse or continuous wave, and the detection methods include direct detection and heterodyne detection
weather radar is a kind of radar specially used for atmospheric detection. It belongs to active microwave atmospheric remote sensing equipment. The high altitude wind radar, which is used with radiosonde, is only a kind of special equipment for positioning displacement balloons, and is generally not regarded as this kind of radar. Weather radar is one of the main detection tools for warning and forecasting medium and small-scale weather systems (such as typhoon and rainstorm clouds). It works in the frequency band of 30-3000 MHz. Generally, it has high detection sensitivity. Because the detection altitude range can reach 1-100 km, it is also known as the middle stratosphere troposphere radar (MST radar). It is mainly used to detect the vertical distribution of atmospheric dynamic parameters such as wind, atmospheric turbulence and atmospheric stability in clear air
the initial interest of the U.S. Department of defense in lidar is similar to that of microwave radar, that is, it focuses on target monitoring, acquisition, tracking, damage assessment (satka) and navigation. However, because the microwave radar is enough to complete most of the damage assessment and navigation tasks, the military lidar plans to focus on a small number of tasks that the former can not complete well, such as high-precision damage assessment, extremely accurate navigation correction and high-resolution imaging. In military, it is often hoped that the aircraft can fly at low altitude, but the minimum altitude of the aircraft is limited by the ability of sensors to detect small obstacles. Not to mention blocking the balloon line and other confrontation facilities, under 60 meters, all kinds of power lines, high-voltage lines, towers, masts, antenna cables and other small obstacles also have obvious dangers. The existing aircraft sensors, from human eyes to radar, are difficult to detect these dangerous objects in advance, especially at night and in bad weather conditions. Because of its high angular resolution, scanning lidar can form effective images of these obstacles in real time and provide appropriate early warning
lidar can be used to measure the trajectories of various flying targets in military. Such as the tracking and measurement of the initial phase of missile and rocket, the tracking and measurement of aircraft and cruise missile at low elevation, the precise orbit determination of satellite, etc. The combination of lidar with infrared, TV and other optoelectronic equipment forms ground, shipboard and airborne fire control systems to search, identify, track and measure targets. Because lidar can obtain the three-dimensional image and velocity information of the target, it is helpful to identify the stealth target. Lidar can monitor the atmosphere, telemeter the pollution and poison in the atmosphere, and measure the temperature, humidity, wind speed, visibility and cloud height of the atmosphere
the traditional way for marine lidar to alert, search, characterize and track underwater targets is to use large and heavy sonar, which usually weighs 600 kg to dozens of tons. Since the development of Ocean Lidar, namely airborne blue-green laser transmitting and receiving equipment, ocean underwater target detection is simple, convenient and accurate. Especially in the third generation lidar which was successfully developed after 1990s, the functions of GPS positioning and height determination were added to realize the automatic control of route and altitude. For example, the "arms" airborne mine detection lidar developed by Northrop company of the United States can work 24 hours and accurately detect suspicious targets such as underwater mines. The underwater imaging lidar developed by American Kaman space company has more advantages. It can display the shape and other characteristics of underwater targets, accurately capture targets, and take emergency measures to ensure navigation safety
in addition, lidar can also be widely used to counter electronic warfare, anti radiation missiles, ultra-low altitude penetration, missile and shell guidance, and land mine sweeping.

4. Your sub account holds less than 3 coins, so there is no income

5. Eth's total net computing power rose 1.18% today
according to spider mine data, BTC's total net computing power is 165.488eh/s, mining difficulty is 23.14t, current block height is 678382, and theoretical profit is 0.00000603/t/day. The total network computing power of eth is 524.120th/s, the mining difficulty is 6788.56t, the current block height is 12202704, and the theoretical profit is 0.00435137/100mh/day. The calculation power of BSV network is 0.663eh/s, the mining difficulty is 0.09t, the current block height is 682075, and the theoretical profit is 0.00135756/t/day. The calculation power of BCH whole network is 1.499eh/s, the difficulty of mining is 0.22, the current block height is 682449, and the theoretical income is 0.00060030/t/day
the Xueshuo innovation blockchain Technology Workstation of Lianqiao ecation online is the only approved "blockchain Technology Specialty" pilot workstation of "smart learning workshop 2020 Xueshuo innovation workstation" launched by the school planning, construction and development center of the Ministry of ecation of China. Based on providing diversified growth paths for students, the professional station promotes the reform of the training mode of the combination of professional degree research, proction, learning and research, and constructs the applied and compound talent training system.

6. How to improve the calculation ability of the third grade primary school students

(1) cultivate the habit of serious examination. When examining the topic, it is required to have a look, two pictures, three thoughts, four calculations and five checks. A look is to see the numbers and operational symbols in the question; The second is to mark which step to calculate first and which step to calculate later on the test questions; Third, thinking about where to use oral calculation, where to use written calculation, and whether to use simple calculation; The fourth calculation is to take notes seriously; The fifth inspection means serious inspection
(2) cultivate the habit of serious calculation. In the four operations, it is necessary to train students' calm and calm learning attitude. When encountering the calculation questions with large numbers and many steps, we should be not anxious, not dry, calm thinking and patient calculation. Even if it is a simple calculation problem, we should be careful and not act rashly. If you can do it orally, you should do it in writing. When calculating, the writing should be neat, the format should be standard and the method should be reasonable. At the same time, strengthen the students' habit of standard drafting to ensure the accuracy of calculation
(3) cultivate the habit of careful examination. It is impossible for students to make no mistakes in their calculations. Teachers should ecate students to form the habit of checking calculus after calculation, and regard examination as an indispensable part of calculation. During the inspection, we should be patient and careful, and check step by step: first, check whether the number in the title is copied wrong; second, check whether the calculation process and results are wrong, and correct the mistakes in time.

7. Students' computing ability is an important task of primary school mathematics teaching, and is an important foundation for students to learn mathematics in the future. So, as a junior mathematics teacher, how to cultivate pupils' computing ability? I start from the following aspects:
first, stimulate the interest in learning computing“ Interest is the best teacher. Interesting computing ability is a basic ability that everyone must have. Cultivating drama and vivid stories will make the relatively simple and boring learning of computing lively and interesting. It will make students interested in learning and get twice the result with half the effort
the game is exciting. For example: the division and combination of teaching numbers can adopt the mathematical game of "clapping hands" and take the division and combination of 10 as an example. The teacher patted his hand and asked: Liao Xiaohe, I ask you, what's my 4 beats? This game can be adjusted according to the change of learning content at any time. According to the students' proficiency, the rhythm can be adjusted at any time; It can change the form at any time, such as collective answer, group answer, indivial student answer, teacher ask student answer, student ask student answer and so on
the story is exciting. To stimulate interest with typical examples of Chinese and foreign mathematicians or short stories related to the classroom content. In teaching, we should timely list the typical examples of Chinese and foreign mathematicians. For example, Chen Jingrun, a famous mathematician in our country, constantly calculates in order to conquer "Goldbach conjecture", and the draft paper calculates in several sacks. Through such vivid and typical examples, we can stimulate students' will and arouse their interest in calculation; Or use the stories that students like to hear and see to activate the classroom atmosphere and attract students' attention. For example, in the two digit plus one digit carry addition, there are some mistakes that often appear when "little careless" is doing the problem. Let the students point out the mistakes first, and then look at the mistakes they have made. It not only arouses students' attention, but also stimulates students' interest in mathematics learning, so that students can concentrate on calculation and improve the learning effect in class
Second, cultivate good computing habits
a good habit of computing is a catalyst for success, which benefits people for life. The advantages and disadvantages of students' computing habits directly affect the formation and improvement of their computing ability. Therefore, in order to improve students' computing ability, we should first cultivate students' good habit of examining questions, writing and checking
the habit of examining questions. A good habit of examining questions is the key factor to improve the calculation ability, and the accuracy of calculation largely depends on the correctness of examining questions. Examination is the key first step in the process of calculation. Examination can overcome the influence of thinking set and eliminate the interference of thinking caused by strong information concentration. For example, when calculating 18-7 + 3, many students calculate 18-7 + 3 = 18 e to the strong information of "rounding". As soon as the students see the topic, they do it. They don't examine the topic carefully, and they don't think about what counts first and then what counts. As a result, such a simple calculation problem is wrong. Therefore, it is urgent to strengthen the cultivation of good examination habits
writing habits. Good writing habits can help students rece unnecessary mistakes. Nonstandard writing is also a common reason for calculation errors. When students are calculating, they sometimes look at it by mistake because of the illegible handwriting, such as 6 and 0, 3 and 8; Some write, write, erase, and blur; Some vertical writing is not standard, the number is not aligned and so on, may cause the calculation error. Therefore, in teaching, it is necessary to require students to write neat, standard format, to urge students to write numbers correctly and clearly
the habit of checking calculation. Checking and checking calculation is not only an effective measure to ensure correct calculation, but also a means to promote students' understanding of calculation process and calculation skills. Students can further understand the inverse operation relationship between addition and subtraction through checking calculation. But because of their weak willpower, primary school students are often unable to consciously check and calculate. Therefore, in the teaching of calculation, we should pay attention to teach students the methods of checking calculation, such as: requiring students to do "four checks": one check whether the number is copied correctly; Second, check whether the symbols are accurate; Third, check whether the operation sequence is correct; 4. Check whether the results are correct and write them down. The cultivation of students' good habits is not a day's work, it needs us to persevere in our efforts. This is a good thing beneficial to students all their lives, and we must do a good job
Third, understand the calculation principle and optimize the algorithm in hands-on operation
calculation is the premise and basis of correct operation. In the students' mind, the examples are clear, and the calculation is orderly. It is a difficult point to explore the arithmetic of carry addition within 20. When learning carry addition within 20, students can put it into practice, experience the process of "making up ten", and understand the method of "making up ten". For example:. At the beginning of class, students list the corresponding formula: 8 + 5 through situations and questions. Some students immediately reported the answer: teacher, 8 + 5 = 13. I said: you are so smart! How many children know the result? If you know, try to verify whether your results are correct; Children who don't know can use learning aids to help us calculate. Under my guidance, students use learning aids to represent 8 and 5 respectively, and operate according to their own different ideas. In the process of operation, students can understand the arithmetic of addition and carry. In the report, I try my best to let the students narrate, supplement, collect all kinds of information, and show a variety of algorithms. On this basis, I guide the students to find that these algorithms are interlinked. They all achieve the purpose of oral calculation by rounding up 10, so that the students can understand this kind of problem. Through the method of "looking at the large number, dividing the decimal, first rounding up 10, then adding a few", they can "optimize" the "diversification" in time, Seek a simple and fast method, so as to improve students' computing ability< Fourth, pay attention to the training of oral arithmetic in the teaching of calculation
in order to make the students have higher computing ability in primary school, we must pay attention to oral arithmetic and strengthen the training of oral arithmetic. Because oral arithmetic is an important part of calculation ability, and it is also the basis of written arithmetic, abacus and estimation. It is widely used in daily life and study. Therefore, in mathematics teaching, I attach great importance to strengthening students' oral arithmetic training. Before each mathematics class, I will use 3 to 5 minutes to carry out various forms of oral arithmetic training for students. For example: (1) oral arithmetic competition, let students write the number directly after the oral arithmetic exercises in the book, and organize proofreading and evaluation after the competition. And let the students who can calculate quickly and correctly talk about their own tricks 2) Read the cards and write the numbers directly. You can write the numbers on the cards. Students can write the numbers one by one. At last, students can show the numbers to organize proofreading and evaluation 3) Look at the problem and answer it by mouth. Let the students do it by themselves and then answer it by name 4) Listen and count, the teacher read the problem, let the students write the problem directly, show the problem after listening and count, organize the students to proofread and evaluate the result 5) Find a friend: let the students take the mental arithmetic card to find the number, etc. This tense and orderly training form can not only pay attention to every student, but also arouse students' great interest, and greatly improve the quality of group students' oral arithmetic practice< 5. Carefully design the calculation exercises
practice is an important way for students to consolidate knowledge and form skills. When designing exercises, we should pay attention to the following points: 1. We can design some exercises that can reflect the basis of calculation theory and the formation of algorithm for students to practice, such as the calculation process of 9 + 5 =. In this way, students not only understand the calculation theory, but also master the calculation method, playing a multiplier effect with half the effort. 2. Practice with easy to confuse contrast. In order to improve the students' identification ability and accuracy of calculation, we put the confusing questions together and let them distinguish and compare. 3. Often make mistakes and practice over and over again. The students use the new algorithm to calculate some of the typical errors on the blackboard, let the students find out the mistakes, correct them, can clear the obstacles for the students algorithm. 4. The practice should be taught according to the person, and the practice goal should be put forward in different levels. For the students with strong computing ability, the requirements can be improved; For students with slow thinking, the requirements are lower; For poor students, let them do the most basic exercises, give help and encouragement in practice, let them overcome inferiority, build up confidence, and really mobilize their learning enthusiasm< Sixth, strengthen the collation and analysis of wrong questions
we should pay attention to the collection and collation of students' mistakes, and analyze the ideological roots of their mistakes. In my usual homework, I prepare a notebook to classify and record the errors in students' calculation, find out the common errors and find out the typical errors, so as to "suit the remedy to the case" in teaching, especially find out the typical errors with unclear calculation and wrong methods, organize students to analyze the root causes, find out the "cause", and then design a certain number of targeted exercises, Purposeful "living therapy". At the same time, each student is required to prepare a wrong problem book, and the students are required to "sort out the wrong problems", record the mistakes in their homework book, exercise book and test paper in the wrong problem book in time, find out the reasons for the mistakes, and correct and classify them in time
it's a long and hard process to cultivate students' computing ability. Let's all math teachers join hands and make unremitting efforts to improve students' computing ability

8. Computational ability is the basic ability of students to learn mathematics, is the basis of learning mathematics, training and improving students' computational ability is one of the main tasks of primary school mathematics. The accuracy and speed of calculation will directly affect the quality of students' learning. Many students always think that computational problems are much easier than analyzing and solving problems, so they are overconfident or unable to concentrate in calculation, resulting in many mistakes. Therefore, calculation teaching can not be ignored. How to improve students' computing ability and make them calculate correctly, quickly, flexibly and reasonably? In the teaching work, I have done some discussion and research, and achieved some good results. I summarize the following experience:
first, find problems and change students' understanding
in order to make students realize the importance of calculation, I first carried out an activity among students: let students collect the mistakes they often make in calculation, which can be carried out by each student himself or through group cooperation to find out the reasons for the mistakes, and see who is serious and who is accurate. When the students' enthusiasm is aroused, they shake off the problems:

(1) wrong reading, wrong ing and scribbling. 6 and 0, 1 and 7 are ambiguous

(2) when the column is vertical, the digits are not aligned

(3) no draft is made ring calculation

(4) one digit addition and subtraction calculation errors lead to errors in the whole question< There are two reasons for carelessness: one is that children's physical and psychological development is not mature enough; the other is that they have not formed good study habits. On the one hand, it is a natural growth process; on the other hand, it can be cultivated by corresponding methods. Therefore, while guiding students to analyze the reasons, it is necessary to highlight the cultivation of students' good learning habits, which is the key to improving their computing ability and the basic requirement of quality ecation< Second, cultivate students' good habit of calculation. Most of the mistakes in calculation are caused by careless, careless and scribbled writing. Therefore, a good calculation habit is the guarantee to improve the calculation ability. In the calculation training, students are required to do one look, two think, three calculate, four check
1. Look: it's serious. How can the result be correct if all the questions are copied wrong? Therefore, students are required to check with the original question or the previous formula in time when ing questions and calculating each step, so as to avoid ing wrong numbers or symbols. There are three points to be done: 1) check with the original question after ing the question; ② Check the numbers on the vertical type with those on the horizontal type; ③ Check the number in horizontal form with that in vertical form
2. Thinking is to examine the topic carefully. When guiding students to do a calculation problem, they should not pick up a pen to do the calculation. They must first examine the problem, make clear what the problem should be calculated first and then, and whether there is a simple calculation method, then they can do the calculation. In addition, the calculation must be accurate first, and then fast< Calculation: to write and calculate carefully. The writing of homework and exercises should be neat, not scribbled. The format must be standardized. The writing of numbers and operation symbols in the title should be in line with the standard. There should be appropriate intervals between the numbers. The vertical type on the draft should be digital aligned and organized clearly. The calculation should be focused and not rush
4. Check: it means calculating carefully. After the calculation, we should first check whether the calculation method is reasonable; Secondly, check whether the numbers and symbols are copied wrong; Thirdly, we should check and calculate every number and final result in the process of calculation. Therefore, it is an important way to cultivate good learning habits to prevent calculation errors and improve calculation ability< Third, to cultivate students' oral arithmetic ability and lay a solid foundation
oral arithmetic is a way to calculate the number directly by thinking and memory. It is an important part of the calculation ability. Therefore, to improve students' calculation ability, we must lay a good foundation for oral arithmetic
1. In order to improve the accuracy and speed of students' oral arithmetic, I consciously ask students to memorize some special mathematical combinations according to their knowledge structure, such as sum is the two numbers of the whole ten and the whole hundred (73 and 27, 98 and 2, etc.). The memory of these results is not only helpful to improve the accuracy of students' calculation, but also greatly improves the speed of students' calculation
2. Arrange exercises in each class. According to the teaching content and the students' actual situation, each mathematics class chooses the appropriate time and arranges 3-5 minutes of oral arithmetic practice, which has been carried out for a long time and achieved good results
3. For example: visual arithmetic training, listening arithmetic training, oral arithmetic, oral arithmetic games, "confrontation", "relay race" and so on, to improve students' adaptability< Fourth, strengthen the teaching of estimation. Estimation can cultivate students' sense of number, guide students to understand "operation" deeply, and help students check the correctness of calculation results. Estimation method can be used to locate the calculation results in advance and quickly determine the value range of calculation results, It can avoid mistakes caused by carelessness. Let the students look at the last digit of the calculation result, such as three and eight digits, the sum of the digits of the result must be one, the multiplication must be four, and so on.
v. collect the types of wrong questions to suit the remedy to the case.
generally speaking, students' mistakes in practice are interlinked and universal, and some of them are easy to correct and overcome under the guidance of teachers, Some are more difficult to correct, especially when they have taken root in their minds. Therefore, in my daily teaching, I am good at timely understanding and collecting the problems existing in the written calculation, selecting common typical mistakes with foresight and pertinence, analyzing and communicating with students, and achieving the purpose of "treating" and "preventing" diseases through collective "consultation"; For those questions which are close and easy to make mistakes, comparative exercises are organized to overcome the negative effect of thinking set and cultivate students' ability of comparative identification
I usually design the requirements for students in this way: judge the right and wrong → find out the wrong place → analyze the cause of the error → correct → summarize the methods to prevent similar errors. In the form of practice, we can do single exercise or comprehensive exercise. In a word, the cultivation of students' computing ability should be carried out in the whole process of primary school mathematics teaching. We should not only strengthen the training of students' basic skills, but also pay attention to the targeted training of students. As long as we carefully study, constantly summarize and improve the work, and seriously dig out the ability factors in the calculation problems, the students' calculation ability will be improved.