How much Dec is produced by 100 computing power
Publish: 2021-05-06 06:27:31
1.
POW: full name of proof of work
pos: proof of stake
both of them are the consensus mechanism of blockchain and the bookkeeping method of digital currency
the difference is:
1. POW mechanism: workload proof mechanism, that is, the proof of workload, is the requirement that must be met when generating a new transaction information (that is, a new block) to be added to the blockchain. In the blockchain network based on workload proof mechanism, the ability of nodes to obtain the correct numerical solution to generate blocks by calculating the numerical solution of random hash hash is the specific performance of node computing power
POS mechanism: the proof of rights and interests requires the certifier to provide a certain amount of ownership of cryptocurrency. The operation mode of the proof of rights and interests mechanism is that when creating a new block, the miners need to create a "currency right" transaction, and the transaction will send some coins to the miners themselves according to the preset proportion. According to the proportion and time of token owned by each node, the equity proof mechanism reces the mining difficulty of nodes proportionally according to the algorithm, so as to speed up the speed of searching for random numbersextended materials:
the concept of bitcoin was first proposed by Nakamoto in 2009. According to Nakamoto's ideas, the open source software and the P2P network on it were designed and released. Bitcoin is a kind of P2P digital currency. Point to point transmission means a decentralized payment system
unlike most currencies, bitcoin does not rely on specific currency institutions. It is generated by a large number of calculations based on specific algorithms. Bitcoin economy uses the distributed database composed of many nodes in the whole P2P network to confirm and record all transactions, and uses the design of cryptography to ensure the security of all aspects of currency circulation. The decentralized nature and algorithm of P2P can ensure that it is impossible to artificially manipulate the value of bitcoin through mass proction
2. There are numerous counterfeit currencies made in China, among which Yuanbao coin, bitcoin, Zhaocai coin and bitstock are well-known
3. Dec Zhongheng MP3, MP4, digital learning machine, GPS navigator, PDA smart phone and other procts, fully adopts the world-class chip technology and independent research and development solutions, and integrates cross domain cutting-edge technologies such as communication and navigation. The procts have strong advantages in advanced technology, performance stability, functional practicability and quality reliability, and are in the "international synchronization and domestic leading" level.
in proct development, Dec Zhongheng takes technology as the guide and market as the foundation to continuously create and meet the increasing application needs of consumers. At the same time, with the management concept of "standardization, standardization and refinement", we strictly implement the international standard of ISO9001 quality system, which is deeply trusted by consumers. After years of unremitting efforts, Dec Zhongheng series procts and brands have been highly recognized by consumers. Its market share has been in the forefront of China for many years, and has won many awards in many awards.
in proct development, Dec Zhongheng takes technology as the guide and market as the foundation to continuously create and meet the increasing application needs of consumers. At the same time, with the management concept of "standardization, standardization and refinement", we strictly implement the international standard of ISO9001 quality system, which is deeply trusted by consumers. After years of unremitting efforts, Dec Zhongheng series procts and brands have been highly recognized by consumers. Its market share has been in the forefront of China for many years, and has won many awards in many awards.
7. Dec
1. = Digital Equipment Corporation (USA) digital equipment company
2. = data equipment company (USA) data equipment company
3. Dec. appears in the usual abbreviation for month
Dec (Digital Equipment Corporation) is known as the true pioneer of personal computer. Dec grafts the display, the most basic user interaction device, with the computer. These innovations enable DEC company to stand at a higher starting point at the beginning of the computer era<
DEC company, USA
Digital Equipment Corporation, USA. In January 1998, DEC company was acquired by Compaq at a price of 9.6 billion US dollars. In 2001, HP Compaq announced the merger
DEC company was born in 1957. At the beginning of 1958, it shipped out the first batch of procts - digital laboratory and digital system components. The sales volume in the first year was US $94000, and the company made a little profit, though very little. 1962 is the fifth financial year of DEC company. The company's sales volume is 6.5 million US dollars and net profit is 800000 US dollars; In 1963, Dec made a profit of 1.2 million US dollars; In 1964, sales rose to $11 million, but profits fell to $900000. In June 1963, DEC company needed a sum of cash to borrow 300000 US dollars from ard company, which was paid off in three years< In 1966, Anderson decided to quit Dec. In 1965, the sales revenue of DEC company was 15 million US dollars, which increased to 23 million US dollars in 1966< On August 16, 1966, DEC company went public with a price of $22 per share. Ard company owned 1.75 million shares, accounting for 65% of the total shares of the company, with a value of $38.5 million and a value-added of 550 times. Olson owned 350000 shares, accounting for 13%, with a value of $7.7 million; Anderson owns 140000 shares, which can be transferred after listing, worth $3 million< In the summer of 1957, Ken Olsen, 31, and Harlan Anderson, 8, decided to start a computer company, which needed $100000 for venture capital. They wanted to find the American research and Development Center (ARD) as an investor. Ard is the first professional venture capital company in the United States. Its general manager is a Frenchman, G. doriot, who helped set up 150 companies. Olson and Anderson drew up a business plan based on the management textbooks in the library, and then wrote to doriot to suggest starting a computer company. Doriot transferred it to William conlleyton, Wayne Brubeck and Dorothy Roy. Conleton asked Olsen to provide a business proposal. Olsen and Anderson worked out a very refined plan, which only had four pages; Conleton asked for a more detailed plan, and Olsen and Anderson redrawn a four-year business plan. Conleton and others are going to introce Olsen to the ard board and put forward three suggestions to them: first, don't use & quot; Computer & quot; Olson agreed not to make computers, but to proce brush circuit components, and changed the company's name from & quot; Digital computer company & quot; Change to & quot; Digital security equipment Co; Second, guarantee a profit of more than 5% (Ollin and Anderson guarantee a profit of 10%); Third, make sure to make profits in a short time (Olson said: & quot; We made profits in the first year& quot; Ard provided Olson and Anderson with $70000 in venture capital and another $30000 in loans (another $300000 a few years later). It's a drop in the bucket to run a computer with this amount of money. Ard owns 70% of Dec. Ard's consistent practice is & quot; Two thirds are owned by investors and one third by entrepreneurs;, Later Business Textbooks evaluated the division method & quot; Unusual & quot;, Olson and Anderson gave up such a large proportion of their shares for such a small investment. There are 1000 founding shares of Dec, among which ard owns 700 shares, accounting for 70%, Olsen and Anderson have 200 shares, accounting for 20%, and they have also made a clear division later; Olsen owns 20% of ADR and Anderson 8% of ard. The remaining 100 shares are to be left to a person in charge of rich business, who always shows that no one can bear these 100 shares. Ard uses the 7 / 9 method to replace the original 7 / 10 method. In this way, ard owns 77% of the shares of Dec. Ard's investment in Anderson and Olsen is a venture capital, not a conventional commercial investment. When ard invested, Olsen and Anderson were required not to engage in computers. Therefore, when the company was founded, they changed the name of the factory from digital computer company to dec (digital equipment company). After ard allowed them to develop computers, Dec began to develop computers. Doriot, the president of ARD, never imposes his will on Dec. as long as Dec needs him, he will stand up and become the strong latter of Olsen and Anderson. The members of ard make up the majority of the board of directors of Dec. DEC company was born in 1957. At the beginning of 1958, it shipped out the first batch of procts digital laboratory and digital system components. In the first year, the sales volume was US $94000. The company made a little profit, though very little. In 1962, the fifth financial year of DEC company, the company's sales volume was 6.5 million US dollars, and the net profit was 800000 US dollars; In 1963, Dec made a profit of 1.2 million US dollars; In 1964, sales rose to $11 million, but profits fell to $900000. In June 1963, DEC company needed a sum of cash to borrow 300000 US dollars from ard company, which was paid off in three years. In 1966, Anderson decided to quit Dec. In 1965, the sales revenue of DEC company was 15 million US dollars, which increased to 23 million US dollars in 1966. The success of venture capital is more reflected in guiding those promising companies to avoid making fatal mistakes. It is the patience and care of ard that help Dec get through the toddler stage. On August 16, 1966, DEC company went public with a price of $22 per share. Ard company owned 1.75 million shares, accounting for 65% of the total shares of the company, with a value of $38.5 million and a value-added of 550 times. Olson owned 350000 shares, accounting for 13%, with a value of $7.7 million; Anderson owns 140000 shares, which can be transferred after listing, worth $3 million.
1. = Digital Equipment Corporation (USA) digital equipment company
2. = data equipment company (USA) data equipment company
3. Dec. appears in the usual abbreviation for month
Dec (Digital Equipment Corporation) is known as the true pioneer of personal computer. Dec grafts the display, the most basic user interaction device, with the computer. These innovations enable DEC company to stand at a higher starting point at the beginning of the computer era<
DEC company, USA
Digital Equipment Corporation, USA. In January 1998, DEC company was acquired by Compaq at a price of 9.6 billion US dollars. In 2001, HP Compaq announced the merger
DEC company was born in 1957. At the beginning of 1958, it shipped out the first batch of procts - digital laboratory and digital system components. The sales volume in the first year was US $94000, and the company made a little profit, though very little. 1962 is the fifth financial year of DEC company. The company's sales volume is 6.5 million US dollars and net profit is 800000 US dollars; In 1963, Dec made a profit of 1.2 million US dollars; In 1964, sales rose to $11 million, but profits fell to $900000. In June 1963, DEC company needed a sum of cash to borrow 300000 US dollars from ard company, which was paid off in three years< In 1966, Anderson decided to quit Dec. In 1965, the sales revenue of DEC company was 15 million US dollars, which increased to 23 million US dollars in 1966< On August 16, 1966, DEC company went public with a price of $22 per share. Ard company owned 1.75 million shares, accounting for 65% of the total shares of the company, with a value of $38.5 million and a value-added of 550 times. Olson owned 350000 shares, accounting for 13%, with a value of $7.7 million; Anderson owns 140000 shares, which can be transferred after listing, worth $3 million< In the summer of 1957, Ken Olsen, 31, and Harlan Anderson, 8, decided to start a computer company, which needed $100000 for venture capital. They wanted to find the American research and Development Center (ARD) as an investor. Ard is the first professional venture capital company in the United States. Its general manager is a Frenchman, G. doriot, who helped set up 150 companies. Olson and Anderson drew up a business plan based on the management textbooks in the library, and then wrote to doriot to suggest starting a computer company. Doriot transferred it to William conlleyton, Wayne Brubeck and Dorothy Roy. Conleton asked Olsen to provide a business proposal. Olsen and Anderson worked out a very refined plan, which only had four pages; Conleton asked for a more detailed plan, and Olsen and Anderson redrawn a four-year business plan. Conleton and others are going to introce Olsen to the ard board and put forward three suggestions to them: first, don't use & quot; Computer & quot; Olson agreed not to make computers, but to proce brush circuit components, and changed the company's name from & quot; Digital computer company & quot; Change to & quot; Digital security equipment Co; Second, guarantee a profit of more than 5% (Ollin and Anderson guarantee a profit of 10%); Third, make sure to make profits in a short time (Olson said: & quot; We made profits in the first year& quot; Ard provided Olson and Anderson with $70000 in venture capital and another $30000 in loans (another $300000 a few years later). It's a drop in the bucket to run a computer with this amount of money. Ard owns 70% of Dec. Ard's consistent practice is & quot; Two thirds are owned by investors and one third by entrepreneurs;, Later Business Textbooks evaluated the division method & quot; Unusual & quot;, Olson and Anderson gave up such a large proportion of their shares for such a small investment. There are 1000 founding shares of Dec, among which ard owns 700 shares, accounting for 70%, Olsen and Anderson have 200 shares, accounting for 20%, and they have also made a clear division later; Olsen owns 20% of ADR and Anderson 8% of ard. The remaining 100 shares are to be left to a person in charge of rich business, who always shows that no one can bear these 100 shares. Ard uses the 7 / 9 method to replace the original 7 / 10 method. In this way, ard owns 77% of the shares of Dec. Ard's investment in Anderson and Olsen is a venture capital, not a conventional commercial investment. When ard invested, Olsen and Anderson were required not to engage in computers. Therefore, when the company was founded, they changed the name of the factory from digital computer company to dec (digital equipment company). After ard allowed them to develop computers, Dec began to develop computers. Doriot, the president of ARD, never imposes his will on Dec. as long as Dec needs him, he will stand up and become the strong latter of Olsen and Anderson. The members of ard make up the majority of the board of directors of Dec. DEC company was born in 1957. At the beginning of 1958, it shipped out the first batch of procts digital laboratory and digital system components. In the first year, the sales volume was US $94000. The company made a little profit, though very little. In 1962, the fifth financial year of DEC company, the company's sales volume was 6.5 million US dollars, and the net profit was 800000 US dollars; In 1963, Dec made a profit of 1.2 million US dollars; In 1964, sales rose to $11 million, but profits fell to $900000. In June 1963, DEC company needed a sum of cash to borrow 300000 US dollars from ard company, which was paid off in three years. In 1966, Anderson decided to quit Dec. In 1965, the sales revenue of DEC company was 15 million US dollars, which increased to 23 million US dollars in 1966. The success of venture capital is more reflected in guiding those promising companies to avoid making fatal mistakes. It is the patience and care of ard that help Dec get through the toddler stage. On August 16, 1966, DEC company went public with a price of $22 per share. Ard company owned 1.75 million shares, accounting for 65% of the total shares of the company, with a value of $38.5 million and a value-added of 550 times. Olson owned 350000 shares, accounting for 13%, with a value of $7.7 million; Anderson owns 140000 shares, which can be transferred after listing, worth $3 million.
8. Carbonate organic solvents are mainly used as electrolyte solvents, including dimethyl carbonate (DMC), diethyl carbonate (DEC), propylene carbonate (PC), ethylene carbonate (EC), methyl ethyl carbonate (EMC), etc<
selection of gas chromatographic separation conditions
experimental part
1. Apparatus
domestic 102G gas chromatograph. Xwc-100, 0 ~ 5mv recorder, using FID detector for qualitative analysis, TCD detector for quantitative analysis< 2. Chromatographic separation conditions
(1) chromatographic column:
A, inner diameter 4mm, column length 4m stainless steel, containing 30% Diisooctyl sebacate, glazed 6201 (60 ~ 80 mesh) coated with 1% triethanolamine as tailing agent (referred to as decane column)
B. the inner diameter is 4mm, the column length is 3.2m, and gdx-01 is installed inside< (2) separation conditions:
a FID detector: carrier gas: nitrogen
decane column:
nitrogen: 32ml / min column temperature: 79 ℃
air: 420 ml / min vaporization temperature: 86 ℃ (see Figure 1)
hydrogen: 32 ml / min hydrogen flame temperature: 100 ℃
gdx-01:
nitrogen: 55ml / min column temperature: 79 ℃
air: 440 ml / min vaporization temperature: 86 ℃ (see Figure 2)
hydrogen: 30 ml / min hydrogen flame temperature: 100 ℃
decane Column:
column temperature: 78 ℃, air and hydrogen: 60 ml / min
vaporization temperature: 100 ℃, thermal conctivity: 220 Ma
injection volume: 2 ml
selection of conditions, That is to say, the same component has smaller DM (g) in the carrier gas with larger molecular weight. According to the rate equation:
(1) the eddy diffusion term has nothing to do with the carrier gas velocity
(2) when the carrier gas velocity is small, the effect of molecular diffusion term on the column efficiency is the main one. Therefore, choosing carrier gas with larger molecular weight, such as N2 and AR, can make the diffusion coefficient D M (g) smaller, so as to rece the effect of molecular diffusion and improve the column efficiency
(3) when the carrier gas velocity u is large, the mass transfer resistance term plays a leading role in the column efficiency, so the gas with smaller molecular weight, such as H2 and he, can rece the gas phase mass transfer resistance and improve the column efficiency
2. Effect of flow rate (U) on column efficiency: according to the rate equation, the molecular diffusion term is inversely proportional to the flow rate, and the mass transfer resistance term is directly proportional to the flow rate. Therefore, in order to minimize the theoretical tray height h and maximize the column efficiency, there must be an optimal flow rate. For the selected column, the height of the tray was measured at different carrier gas flow rates, and the H-u diagram was made
it can be seen from the figure that the lowest point on the curve is the lowest tray height and the highest column efficiency. The average velocity corresponding to this point is the best carrier gas velocity. In the actual analysis, in order to shorten the analysis time, the selected carrier gas flow rate is slightly higher than the optimal flow rate
Fig. 1 H-u curve http://www.foodmate.net/jianyan/lihua/yiqi/5.files/image004.jpg The ratio of liquid to support is also called the ratio of liquid to support
from the rate equation, it can be seen that the ratio of stationary solution mainly affects CSU, and recing DF can rece CSU and improve the column efficiency. However, if the amount of the stationary solution is too small, the active center is easy to exist, resulting in the tailing of the peak; And it will lead to the decrease of column capacity and injection volume. In packed column chromatography, the liquid to support ratio is generally 5% ～ 25%< The selection of column temperature is an important operation parameter, which mainly affects K, K, DM (g) and DS (L); Thus, the separation efficiency and analysis speed are directly affected. The column temperature is closely related to R and t. Increasing t can improve Cu, increase R and shorten t. However, increasing the column temperature will increase B / u, resulting in the decrease of R and the decrease of R21. However, recing t will increase the analysis time
these factors should be taken into account in the actual analysis, and the selection principle is to use a lower column temperature as far as possible under the premise of good separation of difficult separation substances, suitable analysis time and no tail supporting peak shape. At the same time, the selected column temperature should not be higher than the maximum operating temperature of the stationary solution in the chromatographic column (usually 20-50 ℃). For the multicomponent mixture with wide boiling range, the "programmed temperature rise method" can be used to separate the components with low boiling point and high boiling point< The selection of gasification temperature mainly depends on the range of volatility and boiling point of the sample to be tested. Stability and other factors. The gasification temperature is generally selected at or slightly higher than the boiling point of the component to ensure the complete gasification of the sample. For samples with poor thermal stability, the gasification temperature should not be too high to prevent decomposition< 5. The selection of column length and inner diameter can make the components to be determined achieve the desired separation effect, and the shorter column should be used as far as possible. The commonly used filling column is 1 ~ 3M. The inner diameter of packed column is 3-4mm< 6. The selection of injection time and volume
1. Rapid injection (plug shape) - to prevent peak expansion
2. The injection volume should be appropriate: under the permission of detector sensitivity, the injection volume should be as small as possible: the liquid sample is 0.1 ~ 10ul, the gas sample is 0.1 ~ 10ml
for this I check online, choose me ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
selection of gas chromatographic separation conditions
experimental part
1. Apparatus
domestic 102G gas chromatograph. Xwc-100, 0 ~ 5mv recorder, using FID detector for qualitative analysis, TCD detector for quantitative analysis< 2. Chromatographic separation conditions
(1) chromatographic column:
A, inner diameter 4mm, column length 4m stainless steel, containing 30% Diisooctyl sebacate, glazed 6201 (60 ~ 80 mesh) coated with 1% triethanolamine as tailing agent (referred to as decane column)
B. the inner diameter is 4mm, the column length is 3.2m, and gdx-01 is installed inside< (2) separation conditions:
a FID detector: carrier gas: nitrogen
decane column:
nitrogen: 32ml / min column temperature: 79 ℃
air: 420 ml / min vaporization temperature: 86 ℃ (see Figure 1)
hydrogen: 32 ml / min hydrogen flame temperature: 100 ℃
gdx-01:
nitrogen: 55ml / min column temperature: 79 ℃
air: 440 ml / min vaporization temperature: 86 ℃ (see Figure 2)
hydrogen: 30 ml / min hydrogen flame temperature: 100 ℃
decane Column:
column temperature: 78 ℃, air and hydrogen: 60 ml / min
vaporization temperature: 100 ℃, thermal conctivity: 220 Ma
injection volume: 2 ml
selection of conditions, That is to say, the same component has smaller DM (g) in the carrier gas with larger molecular weight. According to the rate equation:
(1) the eddy diffusion term has nothing to do with the carrier gas velocity
(2) when the carrier gas velocity is small, the effect of molecular diffusion term on the column efficiency is the main one. Therefore, choosing carrier gas with larger molecular weight, such as N2 and AR, can make the diffusion coefficient D M (g) smaller, so as to rece the effect of molecular diffusion and improve the column efficiency
(3) when the carrier gas velocity u is large, the mass transfer resistance term plays a leading role in the column efficiency, so the gas with smaller molecular weight, such as H2 and he, can rece the gas phase mass transfer resistance and improve the column efficiency
2. Effect of flow rate (U) on column efficiency: according to the rate equation, the molecular diffusion term is inversely proportional to the flow rate, and the mass transfer resistance term is directly proportional to the flow rate. Therefore, in order to minimize the theoretical tray height h and maximize the column efficiency, there must be an optimal flow rate. For the selected column, the height of the tray was measured at different carrier gas flow rates, and the H-u diagram was made
it can be seen from the figure that the lowest point on the curve is the lowest tray height and the highest column efficiency. The average velocity corresponding to this point is the best carrier gas velocity. In the actual analysis, in order to shorten the analysis time, the selected carrier gas flow rate is slightly higher than the optimal flow rate
Fig. 1 H-u curve http://www.foodmate.net/jianyan/lihua/yiqi/5.files/image004.jpg The ratio of liquid to support is also called the ratio of liquid to support
from the rate equation, it can be seen that the ratio of stationary solution mainly affects CSU, and recing DF can rece CSU and improve the column efficiency. However, if the amount of the stationary solution is too small, the active center is easy to exist, resulting in the tailing of the peak; And it will lead to the decrease of column capacity and injection volume. In packed column chromatography, the liquid to support ratio is generally 5% ～ 25%< The selection of column temperature is an important operation parameter, which mainly affects K, K, DM (g) and DS (L); Thus, the separation efficiency and analysis speed are directly affected. The column temperature is closely related to R and t. Increasing t can improve Cu, increase R and shorten t. However, increasing the column temperature will increase B / u, resulting in the decrease of R and the decrease of R21. However, recing t will increase the analysis time
these factors should be taken into account in the actual analysis, and the selection principle is to use a lower column temperature as far as possible under the premise of good separation of difficult separation substances, suitable analysis time and no tail supporting peak shape. At the same time, the selected column temperature should not be higher than the maximum operating temperature of the stationary solution in the chromatographic column (usually 20-50 ℃). For the multicomponent mixture with wide boiling range, the "programmed temperature rise method" can be used to separate the components with low boiling point and high boiling point< The selection of gasification temperature mainly depends on the range of volatility and boiling point of the sample to be tested. Stability and other factors. The gasification temperature is generally selected at or slightly higher than the boiling point of the component to ensure the complete gasification of the sample. For samples with poor thermal stability, the gasification temperature should not be too high to prevent decomposition< 5. The selection of column length and inner diameter can make the components to be determined achieve the desired separation effect, and the shorter column should be used as far as possible. The commonly used filling column is 1 ~ 3M. The inner diameter of packed column is 3-4mm< 6. The selection of injection time and volume
1. Rapid injection (plug shape) - to prevent peak expansion
2. The injection volume should be appropriate: under the permission of detector sensitivity, the injection volume should be as small as possible: the liquid sample is 0.1 ~ 10ul, the gas sample is 0.1 ~ 10ml
for this I check online, choose me ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
9. Henan Dezhong Electric Co., Ltd
10. #include < stdio.h > < br/>int main()
{
> int x,y,z,flag=0;
br/> / > for (x=100; x <= 200; x++)
> 9;{< br />> 9;{ y=2; y*y < = x; y++) / /_modify + modification + modify
×09;}
>> 09; ×9if(flag==1)printf("% d in elements \ n ", x): / / Final sub should be called the English sub
> 9;< br /> }
}
{
> int x,y,z,flag=0;
br/> / > for (x=100; x <= 200; x++)
> 9;{< br />> 9;{ y=2; y*y < = x; y++) / /_modify + modification + modify
×09;}
>> 09; ×9if(flag==1)printf("% d in elements \ n ", x): / / Final sub should be called the English sub
> 9;< br /> }
}
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