BTC logarithm

1. I can't give you an accurate answer to this question because digital currency covers too many aspects. There is also the possibility that many new cryptocurrencies are born or die every day. Now the world's more well-known digital currencies are bitcoin, dogcoin, Leyte coin, bitstock, reborn coin, Yuanbao coin, Diandian coin and so on. It is said that Ecuador, a small South American country, recently created its own official cryptocurrency
according to incomplete statistics, more than 200 counterfeit coins have been proced since 2014, and more than 100 have survived. The life cycle of Shanzhai coin is generally about 2-3 months. Because the purpose of some Shanzhai coins is to earn money without any innovation. When the price is high enough, the makers will sell a lot to cash out. Without the support of the makers, this kind of counterfeit money will eventually die.

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4. Hello, the blanking size of the cylinder of pressure vessel, taking the circular cylinder as an example, can be expanded according to the middle diameter, that is, the inner diameter of the cylinder plus the wall thickness of the cylinder, and then the cutting or machining allowance is the blanking size
for example, for a cylinder section with 1m inner diameter, 500mm long and 16mm thick, after blanking, it is necessary to leave 20mm allowance in the length direction, then the blanking calculation size is: Expanded (1000 + 16) * 3.14 = 3190
final blanking size: 3190 * 520

5. It's not surprising that they pass

6. When I write this point, I don't want to deceive who will take over the offer, nor do I want to attack the policy - I quite support the policy

there is only one purpose to make a voice. From the perspective of bitcoin, we can observe this multi-dimensional world

first of all, bitcoin is neither a tulip nor a Ponzi scheme. Of course, bitcoin can never be the currency of the future, and it will definitely die out - if we look at it from the perspective of time, there is no immortality in the world

it has been said for a long time that bitcoin is compared to tulip and Ponzi scheme, among which there are many so-called well-known "experts and scholars". It is hard to tell whether there has been "tulip bubble" in history and whether it is exaggerated. If you have to make an analogy, it's better to say "Clivia". The reason why the three are compared is that they have similarities. However, arbitrary evaluation of the three is the same, lacking the spirit of speculation and one dimension. Twenty years ago, if you saw Ma Yun, it was hard not to doubt that he was a liar. Good business models are so similar to pyramid schemes, geniuses and lunatics in some ways

If I have to give a definition to bitcoin, my answer is: a new species, the beautiful shell in the Internet era

to understand what bitcoin is, we need to divide the world into two groups. One is the currency under a strong regime, and the other is the free market without or avoiding power. From this perspective, bitcoin is clear

under a stable regime, we want a stable financial system and monetary policy that can be controlled. Of course, bitcoin does not meet the definition. From this point of view, it is tolerant to say that bitcoin is a tulip. It is a naked Ponzi scheme

however, there are still many people in the world who live in unstable political power or want to avoid political power. Bitcoin has become a kind of empowering currency, just like the shell of many years ago. At this level, bitcoin is already a "currency."

we have the protection of Yangma and the convenience of the Internet, and bitcoin is a spontaneous trust of Yangma and Internet payment in an unstable environment. For example, they are the "Alipay" of the Kosovo Zimbabwe people's mama. p>

the real supporters of bitcoin, no matter where they live, essentially have the same ideas as people in the "currency area"

so today, it is nothing more than the collision of two originally unrelated circles: people in "non currency areas" hype bitcoin and rob people's property in "currency areas" in disguise

bitcoin's own commitment system is broken by higher technology, which is the day when bitcoin will die out

if it can't be broken, the world is still not peaceful and consensus hasn't been reached, and bitcoin still has a long way to go

There is a movie by Stephen Chow called Su Qi'er, the number one scholar in martial arts. The emperor told Su Qi'er, the leader of the beggars' sect, "you are a heavy disciple of the beggars' sect. I can't be at ease." Su Qier replied, "if the emperor has good governance and the people live and work in peace and contentment, who wants to be a beggar?"

7.

finally, we get the following relationship between bitcoin price and number of users, which is the logical relationship. It is a kind of equation to describe the relationship between the number of species and time in biology, so the title of the paper is "bitcoin spreads like a virus"

the study also found that this relationship is not accidental, but there is a law behind it, which is Metcalfe's law

Metcalfe's law

in the 1980s, Robert Metcalfe, the inventor of Ethereum, proposed a method to evaluate the value of the Internet. He believes that the value of the network is directly proportional to the square of the network nodes (users). This is the so-called "network effect". The more users, the greater the value of the network

in a network with n users, the number of links between each user and other users is n (n-1) / 2. When n is large, n (n-1) / 2 is about n & # 178;. In this way, Metcalfe's law takes the following form: network value equals the constant c times the square of n

However, if n grows linearly with time, the network value will grow exponentially with time, and there is no boundary, which is obviously not in line with the reality. Therefore, in 2013, Metcalfe revised that n should be logistic growth, which is known as "s" growth

this rule is not only applicable to bitcoin, Peterson also studied the price change of Facebook over time, and found that the price of Facebook also applies to Metcalfe's law

8. 1、 The main structure of the financial situation analysis report

(1) the title of the report
is the most concise summary of the financial situation analysis report. It should not only accurately reflect the theme of the analysis report, but also be concise and eye-catching. As the contents of financial analysis report are different, there is no uniform standard and fixed model for its title, which should be determined according to the specific analysis content. Such as "analysis report of a month's brief accounting statements", "comprehensive financial analysis report of a year", "analysis report of asset utilization efficiency", etc
(2) basic information
that is to summarize the comprehensive situation of the enterprise, so that the users of the financial report can have a general understanding of the analysis and explanation of the financial situation. For example, the main business scope and other business situation of the enterprise, and the operation and financial status of the enterprise are introced. This part requires proper words and accurate data reference. Absolute number, comparative number and composite index number can be used to explain economic indicators. Special attention should be paid to the current operation focus of the enterprise, and important matters should be reflected separately< Comprehensive analysis
(3) comprehensive analysis
comprehensive analysis is to analyze and study the business situation of an enterprise, analyze the problems while explaining the problems, and find out the causes and crux of the problems, so as to achieve the purpose of solving the problems. Financial analysis must be reasonable and well founded. It is necessary to refine and decompose various indicators. It is necessary to be good at using tables and diagrams to highlight the content of analysis. When analyzing problems, we must be good at grasping the current key points, and reflect the focus of enterprise management and problems that are easy to ignore< (4) overall evaluation after financial explanation and analysis, we should give fair and objective evaluation and prediction on the operation, financial status and profit performance from the financial point of view. The evaluation should be carried out from both positive and negative aspects. The evaluation can be carried out separately, or the evaluation content can be interspersed in the explanation part and the analysis part< (5) work suggestions: the opinions and opinions formed by financial personnel after analyzing the operation and investment decisions, especially the improvement suggestions for the problems existing in the operation process. It is worth noting that the suggestions in the financial analysis report should not be too abstract, but should be specific and practical< (1) analysis of business indicators
mainly describes the basic situation of the enterprise, the completion of the main economic indicators of the enterprise's proction and operation business in the current period, such as the actual output, business volume, sales volume and year-on-year increase and decrease. The financial evaluation indexes reflecting the development ability of enterprises are: sales growth rate, capital accumulation rate, total assets growth rate, three-year average capital growth rate; The average growth rate of sales in three years. Comparing these indicators with the standard indicators and the same period of last year, the increase and decrease values are calculated, and the achievements and existing problems in proction and operation are analyzed from the following aspects: first, the impact of changes in the operating environment, mainly the impact of changes in the internal and external conditions of enterprise proction and operation; Second, the adjustment and influence of business scope; Third, the impact of other business situations and matters to be disclosed. Find out the main influencing factors, and explain the main reasons for the achievements of the enterprise, explain the reasons for the problems and difficulties in the operation of the enterprise, so as to make the enterprise clear the direction of development in the future< (2) analysis of profit and loss index
1. Compare the actual profit of the current period reflected in the income statement with the planned amount and the actual amount of the same period of last year, and analyze the profit realization and the increase and decrease value. What is the total realized profit (loss) in the current period, the increase or decrease amount and the increase or decrease rate compared with the plan and the same period last year; This paper analyzes the composition of the actual total profit in the current period, including the main business profit, other business profit, non operating revenue and expenditure, and the increase and decrease of the planned amount and the same period of last year
2. Calculate the profitability analysis indicators such as return on net assets, return on total assets, main operating profit margin, cost profit margin, and calculate the increase and decrease value with the standard value compared with the same period of last year
3. According to the analysis and calculation results, analyze and evaluate the strength of the enterprise's profitability, and analyze its impact on the current profit from the year-on-year increase and decrease of main business income, the year-on-year increase and decrease of cost and expense, other business profits, net operating income and expenditure, and find out the reasons for the enhancement (weakening) of profitability< (3) analysis of capital index
1. Through the analysis of capital structure proportion, this paper analyzes the composition proportion of each item in the current balance sheet, income statement and other statements, compares the instry proportion with the project proportion in the same period of last year, and combines growth analysis with structure analysis to judge the rationality and scientificity of the composition proportion of each item
2. The evaluation indexes mainly include: total assets turnover, current assets turnover, fixed assets turnover, inventory turnover and accounts receivable turnover. For example, through the analysis of the turnover rate of accounts receivable, we can get the speed of the realization of accounts receivable and the level of management efficiency. If the turnover rate is high, it shows that the collection speed is fast, the account age is short, the asset liquidity is strong, the short-term solvency is strong, and the collection expenses and bad debt losses can be reced. At the same time, by comparing the turnover period of accounts receivable with the credit period of enterprises, we can also evaluate the credit degree of the entrusted processing units, adjust the original credit conditions, and formulate the corresponding collection policies (next to page 64) (next to page 62). By analyzing the turnover of fixed assets, we can know whether the utilization rate of fixed assets is reasonable and whether the structure of fixed assets is appropriate
3, calculate the solvency of the enterprise, the main indicators are: quick ratio, current ratio, asset liability ratio, equity ratio, etc
4. Variance analysis of indicator changes: compare the calculation results of various indicators in this period with the standard value and the same period of last year, find out the indicators with large or abnormal changes as the key analysis objects, and reveal the problems and reasons existing in the operation< The index to measure the value maintenance and appreciation of state-owned assets is the value-added rate of state-owned capital. Through the analysis of this index, we can fully reflect the protection of state-owned assets, timely and effectively find the phenomenon of erosion of state-owned assets, and reflect the preservation and growth of state-owned capital< It is generally believed that the higher the value preservation and appreciation rate of capital, the better the capital preservation of enterprises. When the rate of value preservation and appreciation reaches 100%, it means value preservation. When the rate exceeds 100%, it means value increment. If the rate is less than 100%, it means that the state-owned capital is devalued. It means that the state-owned assets have been eroded, lost and lost, and the capital preservation has not been realized
3. According to the degree of realization of the value maintenance and appreciation of state-owned capital, analyze the reasons, especially attach great importance to those who have not realized the value maintenance of capital, find out the loopholes and study the countermeasures.

9. SP hybrid is composed of s-orbitals and a p-orbitals. The angle between the symmetry axes of two SP hybrid orbitals is 180

10.

SP hybrid is composed of s-orbitals and a p-orbitals. The angle between the symmetry axes of the two SP hybrid orbitals is 180 & amp; ordm; In a straight line). The two p-orbitals not involved in the hybridization are perpendicular to each other, and both of them are perpendicular to the line formed by the symmetry axis of the two SP hybrid orbitals. SP hybridization: take acetylene as an example, carbon atoms are hybridized with a 2S orbital and a 2p orbital to form two equal SP hybrid orbitals. Each SP hybrid orbit contains 1 / 2S orbital component and 1 / 2p orbital component. The symmetry axes of the two SP hybrid orbits form an angle of 180 degrees and are in the same line. For ABN type molecules, the number of lone pair electron pairs = (a outermost electron number - B bonding electron number) × n) ÷ For BaCl2, the number of lone pairs = (2-1) × 2 ÷ For BF3, the number of lone pairs = (3-1) × 3 ÷ 2 = 0, the number of bonding electron pairs = 3, the sum of the two is 0 + 3 = 3, so it is SP2 hybrid, and so on, 4 is SP3 hybrid, 5 is sp3d hybrid, 6 is sp3d2 hybrid and so on ° Linear btcl3sp2 hybrid 120 ° Planar triangle hgcl2sp3 hybrid 109 ° 28 ′ tetrahedral CH4, SiH4, NH4 + sp3d2 hybrid 90 ° And 180 ° The type of normal octahedral SF6 unequal hybrid orbitals (with lone pair electrons in hybrid orbitals) and SP3 unequal hybrid orbitals 104 ° 45 'triangle H2O h2s107 ° 5 'triangular pyramid NH3 PH3