Blockchain segment

1. What is mining
for example, bitcoin was invented by Zhongben Cong in 2009, and the total number of bitcoin was only 21 million. By participating in the proction of blocks and providing proof of work (POW), we can get the reward of bitcoin network. Mining is the process of packaging and confirming the transactions in the bitcoin system over a period of time, and then recording them on the block

if you need to know more about it, you can look at my account number; Let's discuss

what is moving bricks
when it comes to "moving bricks", you will think of migrant workers or various online jokes, but today we only discuss "moving bricks" in the blockchain market
to describe "moving bricks" in vernacular is to make profits by using the price difference between different exchanges. The same currency has different prices in different markets. Buy it in a cheaper place and sell it in a more expensive place. The middle price difference is your profit
for example, the price of bitcoin BTC is $4000 on exchange a and $4100 on exchange B. after a buys BTC, it can be sold to B and each one can earn $100. This process is called "moving bricks"

2.

Blockchain is on fire! It's so hot that I have no friends! In recent days, it has been swished by various popular science jokes of blockchain, just like crowdfunding, equity and original stocks in the past two years. If you go out and chat with others, you will be embarrassed to chat with others if you don't talk about blockchain. Textbook like explanation: an intelligent peer-to-peer network that uses distributed database to identify, disseminate and record information. It is a distributed database system with different nodes and an open ledger

the concept of "after the rules are settled, everyone will register spontaneously" in wechat organization corresponds to the concept of "decentralization, no single user can control it" in the blockchain. "Registration in wechat group" in wechat group corresponds to the concept of "peer-to-peer network" in blockchain. "As long as the network is connected, we can know the latest progress" in wechat organization Bureau, corresponding to the concept in blockchain, namely "game mechanism"

3. In short, blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies. Blockchain technology enables all data in the database to be stored in all computer nodes of the system and updated in real time. The completely decentralized structure can record data in real time and update it in every network node participating in data storage, which greatly improves the security of database.

4.

Invisible bitcoin can not only make people rich or poor overnight, but also bring people worry about their lives

According to Ukrainian media reports quoted by the daily telegraph, on Tuesday (December 26), Pavel Lerner, CEO of the British bitcoin exchange exmo, was kidnapped after leaving his office in Kiev, Ukraine, and dragged into a black galloping car by a group of masked people

after the above news came out, a spokesperson of exmo told the daily telegraph that we are doing our best to speed up the search for Lerner and welcome all clues from the outside world. Exmo's business is running as usual and all users' funds are absolutely safe. According to the company's official website, the platform has more than 900000 users

after the kidnapping incident attracted public attention, exmo also announced on official twitter on Thursday that it had been attacked by DDoS (distributed denial of service) with the intention of destroying platform transactions

according to Wall Street reports, at the beginning of this month, when bitcoin rose to more than US $13000, the payment system of nice hash, the world's largest digital currency mining platform, was hacked and bitcoin in users' wallets was stolen. Bitcoin millionaire, a bitcoin information website, has since estimated that as many as 4736 bitcoins were stolen by hackers, with a total value of more than $62 million

interestingly, as a foreign netizen imagined, after the kidnappers received the ransom, if bitcoin continued to appreciate, it would be OK. If bitcoin collapsed before the gloves turned, wouldn't it be a "huge loss"

In fact, this is also the old question in the minds of many investors - how long can bitcoin's investment boom last

On December 2, when talking about bitcoin in public activities, pan Gongsheng, vice governor of the people's Bank of China, said that it was a decisive and correct decision for regulators to shut down bitcoin trading platform and stop ICO a few months ago

According to BBC news, on December 14, Andrew Bailey, CEO of the financial conct authority (FCA), the UK's top regulator, issued a warning to investors, saying that bitcoin buyers should be ready for "full compensation". Bitcoin lacks the endorsement and support of the government and the central bank, and its risk level is the same as gambling, he said

on Thursday (December 28), the South Korean government announced the countermeasures to combat virtual currency speculation, and considered closing some virtual currency transactions, so as to curb excessive speculation. In addition, the South Korean government has decided to implement the real name system of virtual currency trading and expand the investigation authority of the Fair Trade Commission, the anti-monopoly law enforcement agency

In a statement, the South Korean government said that cryptocurrency speculation in South Korea has gone too far and has become irrational, according to the report. The government can no longer allow abnormal speculation to develop

the Indian authorities also issued a warning. On Friday, India's finance ministry warned investors about the risks of cryptocurrencies such as bitcoin, saying digital currency investments look like a Ponzi scheme, Reuters reported. In a statement, India's Ministry of Finance said investors and other participants in digital currency transactions were "entirely at their own risk" and advised that it was best to avoid such investments

but from the perspective of optimists, bitcoin is not as static as gold. As a virtual currency, its software code is constantly developing, and its functions can be constantly adjusted, improved and updated, and its value can be realized in unimaginable ways, such as, Many bitcoin fans are looking forward to bitcoin's "lightning network" (an improved way to facilitate payment). If bitcoin gets more attractive functions in the process of continuous evolution, people can even use it for convenient and fast cross-border payment

according to China Securities Journal, based on the sustainability of bitcoin development, bitcoin supporters believe that even if the market value of cryptocurrency expands to 20 times the current value, the market will not go crazy. However, as far as bitcoin itself is concerned, with more and more new technologies coming out, bitcoin's share in the cryptocurrency market will show a downward trend in the future

Hong shuning, a senior researcher of Suning Institute of financial research, recently wrote an article, imagining two situations of "truly killing bitcoin":

first, all bitcoin development teams are conservative and complacent, no longer absorbing the latest scientific and technological achievements to improve themselves, resulting in the emergence of a new digital currency with all aspects of technical indicators exceeding bitcoin, It is widely accepted by the society and then replaces bitcoin. This is the failure of bitcoin, but also the success of virtual digital currency

Second, there are serious loopholes in the bitcoin protocol or wallet software, which lead to the security of the whole bitcoin system can not be guaranteed, a large area of funds are stolen, sold at a low price and uncontrollable in the short term, and the social confidence in bitcoin is completely lost

so. In this world, money is easy to use

5.

The deposit fee of 100 yuan for registration can be returned after completing all courses

tutoring class was given under the line, and the lecture lasted for 4 days, with 7800 yuan per person

RMB 88888 per person for 3 days and 2 nights

What is

...

blockchain? Maybe few people can really answer this question. It is precisely because of the inherent mystery of "blockchain", that many people are eager to pay for knowledge in order to get on the train to the "future"

therefore, all kinds of blockchain training are also very popular, and all kinds of information, such as "scanning code, entering the group to listen to lectures", are filled with the circle of friends, so it is difficult to distinguish the good from the bad. The training costs are even more uneven: 100 yuan, 300 yuan, 7000 yuan or even nearly 100000 yuan...

blockchain training is too hot

I often make up my identity on the dating materials, such as import lighting wholesalers, urban landscape designers, boutique tobacco hotel owners and agricultural loan salesmen. Now, I have finally become an expert in blockchain training courses

} photo source: a screenshot of a recruitment website

and it is reported that a blockchain recruitment advertisement in Beijing recently blew up the circle of friends, requiring candidates to have in-depth research on blockchain technology and cryptography, giving an annual salary of not less than 5 million yuan, and not capped

"this is really the current situation of blockchain talent recruitment. But even so, we can't find people, because it's hard to find qualified people. " Lu Sheng, head hunter of Liepin platform, said

Song Mofei, senior researcher of Suning Institute of finance, said: "in terms of development experience, the rise of domestic blockchain instry has been concentrated in the last two or three years, and few people have long-term blockchain development experience in the talent market." He believes that excessive salary will inevitably attract some speculators, but the increase of salary does not bring about the increase of the application threshold, and even some recruiters only know a little about blockchain technology, which also poses new challenges for the recruitment of blockchain talents

according to Shan Yi, chief data officer of liepin.com, the core of blockchain is the change of social relations and business model based on Internet distributed trust system, which is characterized by decentralization“ There are still many uncertainties in the future development of block chain. There are obvious bubbles at present, and many block chain projects are not reliable. He said

6. Blockchain is an important concept of bitcoin. In essence, it is a decentralized database and the underlying technology of bitcoin. Blockchain is a series of data blocks generated by cryptography. Each data block contains the information of a bitcoin network transaction, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block
in a narrow sense, blockchain is a kind of chain data structure that combines data blocks in chronological order in a sequential way, and it can not be tampered with and forged by cryptography. In a broad sense, blockchain technology is a new distributed infrastructure and computing paradigm, which uses blockchain data structure to verify and store data, uses distributed node consensus algorithm to generate and update data, uses cryptography to ensure the security of data transmission and access, and uses intelligent contract composed of automated script code to program and operate data
both eurocrowdfunding and Ethereum use blockchain technology.

7. Love needs to respond. If a person loves you very much and you don't respond to her, she will be disappointed graally. If she is disappointed, she will die

at this time, don't ask why, don't say that she loves me so much, how can she leave me? Love is limited, when her love is not cherished, when her love can not be responded, she naturally gave up

don't say "she will love me all her life." when she loves you, she really wants to love her all her life, but how do you completely ignore her? How can she love her

at the beginning, she will quarrel with you and quarrel with you. I hope you can pay attention to her and give her the love she wants. But slowly, she will no longer quarrel with you and discuss these things with you. It's just that she doesn't want to love any more and wants to give up this relationship

if you really love her, don't let her down, and don't let her feel cold. If your heart is cold, you can't cover it. If you are disappointed, you can't come back

you need to understand that the real death of a woman is not noise, but inner peace

it's very calm to really give up a person. She no longer has any emotion in her heart. She just wants to leave you. Leaving this relationship will only bring her pain

in fact, the more people quarrel and say they want to leave, the more they will not take the initiative to leave. Her quarrel with you is just to tell you that if you don't keep me, you will lose me

but if she really gives up, she will never want to stay, she will never want to entangle with you, just want to leave you calmly and say goodbye to this relationship

if one day she will leave you, it must be that she has accumulated enough disappointments before she chooses to give up you. Therefore, if you love her, don't let her down easily

when love leaves, it is silent. When she is no longer noisy, it is not compromise, but death

she doesn't have no pain, but chooses a person to bear it in silence. She is also telling you that she no longer expects you to stay, and she no longer has illusions about this relationship

in this process, she must have experienced a lot of disappointments, she must have struggled and hesitated, and in the end, she was silent and calm

at this time, she doesn't want to give you a chance any more. Noisy is because she cares about it. Noisy is because she still wants to continue. The real death is silent and endless

when she really leaves, she will not come to inform you. She will leave in silence, will not say hello to you, and will not cry and cry for you to stay, but will face her calmly

if you love her, don't hurt her. If you love her, don't let her give up on this relationship. Treat her well and cherish this relationship!

8. Hello, the income distribution principle of the money market fund is that the fund manager calculates the income generated by the account on that day for the investor according to the net income of the fund share on that day, and includes it in the current accumulated income of the account. The current accumulated income of the investor's account shall be carried forward to the fund share and included in the investor's fund account every month. If the current cumulative income of the investor's account is positive, the fund share of the investor's account is increased; On the contrary, the fund share of the investor's account is reced.

9.

With the progress of science and technology and the development of architectural design, mechanical building is not only solid, but also gives people a sense of sureness and comfort. Then some engineering construction needs accurate scientific calculation, and then engineering development begins. The following small series simply describes the deflection calculation formula for you, so as to help some architectural design complete

the first step:

1. when the load acts on the midspan, the calculation method of deflection is Fmax = (P · L3) / (48 × E · I)

2. when the load acts at any point, the calculation method of deflection is Fmax = {P · L1 · L2 (L + L2) · [3] × L1·L＋L2]1/2｝/27 × E·I·L

< / OL >

that is to say, if we analyze these two cases, we will find that when the concentrated load acts on any point, that is to say, any point can be the midpoint, then the upper & 8218; The formula will contain; The second is the formula; It is a special case in the formula of knowledge deflection, of course, that is, L1 = L2 = L / 2. Then we can think like this, substituting L1 = L2 = L / 2 into & 8218; Where, max = {P · L1 · L2 (L + L2) · [3] × L1·L＋L2]1/2｝/27 × E·I·L

=｛P·L/2·L/2L＋L/2·[3 × L/2·L＋L/2]1/2｝/27 × E·I·L

=｛P·L2/4·3L/2·[9 × L2/4]1/2｝/27 × E·I·L

=｛P·3L2/8·[3 × L/2]｝/27 × E·I

=P·9L3/16/27 × E·I

=P·L3/48 × E · I)

in this way, the above ideas are checked







the second step:




simple derivation process:

we take the simply supported beam as an example: the whole beam should be divided into two sections

for the left section of the beam, when 0 ≤ x1 ≤ L1, its bending moment equation can be expressed as:

MX1 = (P · L2 / L) · X; Let F 1 be the deflection of the left section of the beam

The integral of

e · I · F1 / = (P · L2 / L) · x

gives e · I · F1 / = (P · L2 / L) · x2 / 2 + C1 & # 129

quadratic integral: e · I · F1 = (P · L2 / L) · X3 / 6 + c1x + D1 & 8218

When X1 is equal to zero,

the deflection F1 of simply supported beam is equal to zero (boundary condition)

by substituting X1 = 0 into (2), D1 = 0










for the right section of beam, that is, when L1 ≤ x2 ≤ L, the bending moment equation can be expressed as:

MX2 = (P · L2 / L) · X-P · (x-l1)

Let F 2 be the deflection of the right section of the beam, then e.i.f 2 / = (P.l 2 / L) · X-P · (X-L 1)

is integrated by mechanics of materials to get e.i.f 2 / = (P.l 2 / L) · x2 / 2 - [P (X-L 1) 2 / 2] + C2 & #

quadratic integral: e · I · F2 = [(P · L2 / L) · X3 / 6] - [P · (x-l1) 3 / 6] + c2x + D2 (4)

if the left and right segments are connected,

< P > ① at x = 0, F1 = 0
(2) at x = L1, F1 / = F2 / (F1 /, F2 / are the obliquity of deflection curve)
(3) at x = L1, F1 = F2
(4) at x = L, F2 = 0
According to the above four conditions, C1 = C2 = - [(P · L2) / 6L] · (l2-l22); D1=D2=0

substitution formula&# 8218;、&# 402;、 ④ The results are as follows:

for left segment 0 ≤ x ≤ L1




e · I · F1 / = (P · L2 / L) · x2 / 2 + C1 (1)

< P > = P · L2 / 6L · [3x2 - (l2-l22)] (5)

e · I · F1 = (P · L2 / L) · X3 / 6 + c1x + D1 (2)

= (P · L2 / 6) × 50) · [x3-x (l2-l22)] (6)

for the right segment L1 ≤ x ≤ l

e · I · F2 / = (P · L2 / L) · x2 / 2 - [P · (x-l2) 2 / 2] + C2 (3)

= (P · L2 / 6 × 50) · [3x2 - (l2-l22)] - [P / 2 · (x-l1) 2] (7)

e · I · F2 = [(P · L2 / L) · X3 / 6] - [P · (x-l1) 3 / 6] + c2x + D2 (4)

= (P · L2 / 6L) · [x3-x (l2-l22)] - [P / 6 · (x-l1) 3] (8)

and so on




the third step: proceed according to the above foundation:




If L1 > L2, then the maximum deflection is obviously in the left segment. If the inclination equation (5) f / of the left segment is equal to zero, then the position of the maximum deflection is obtained, So let:

P · L2 / 6L · [3x2 - (l2-l22)] = 0

then: 3x2 - (l2-l22) = 0

get: x = [(l2-l22) / 3] 1 / 2 (9)

substitute (9) into (6) to get the maximum deflection

Fmax = - [P · L2 · (l2-l22) 3 / 2] / [9] × 31/2 × L · e · I] (10)

expand to get:

Fmax = - {(P · L1 · L2 · (L + L2) · [3] × L1·L＋L2]1/2｝/27 × E·I·L

this is the derivation process of the formula, which may not be very clear to non professionals. Xiaobian hopes to give a helpful guide to professionals, hoping that relevant people can apply it in architecture. The above is the content of the deflection calculation formula, I hope to help you

10. 650mah is battery capacity
bak means that the cell is proced by bicker company<
423048 refers to the specification of the cell (internal part of the battery), which is 4.2mm in thickness * 30MM in width * 48mm in length (please check it yourself)
btc8g26 / 04kh is the traceability code of the battery. If you find that there is a problem with the battery, especially the safety problem, return it to the manufacturer, and the manufacturer can find out the proction material, proction process, proction shift date and other information of the battery according to this code, so as to find out the cause of the battery problem, and improve the proction material and process, so as to avoid similar problems with other batteries. If necessary, call back the problem batteries of the same batch, Avoid greater losses, especially when there are fatal problems such as fire
I am a proction engineer of lithium battery. If you have any questions, please leave a message on my blog
ha ha, is the answer professional enough?