Central bank digital currency exchange
On November 9, 2019, the central bank has not launched digital currency
in 2014, the Central Bank of China set up a special research team to conct in-depth research on the framework of digital currency issuance and business operation, key technologies of digital currency, issuance and circulation environment, and legal issues
in January 2017, the central bank officially established the digital currency Research Institute in Shenzhen
in September 2018, the Institute of digital currency built a trade finance blockchain platform
On July 8, 2019, at the launching ceremony of the digital finance open research program and the first academic seminar, Wang Xin, director of the Research Bureau of the people's Bank of China, disclosed that the State Council has officially approved the research and development of the central bank's digital currency, and the central bank is engaged in corresponding work in organizing market institutions 
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benefits of digital currency
the digitalization of central bank's currency helps to optimize the central bank's monetary payment function, improve the central bank's monetary status and the effectiveness of monetary policy. The central bank's digital currency can become an interest bearing asset to meet the holder's reserve demand for safe assets, and can also become the lower limit of bank deposit interest rate. It can also become a new monetary policy tool
at the same time, the central bank can affect the bank deposit and loan interest rate by adjusting the digital currency interest rate of the central bank, and help to break the zero interest rate lower limit
definition of the Internet of things: the Internet of things is an important part of the new generation of information technology, and also an important development stage in the "information" era. Its English name is "Internet of things (IOT)". As the name suggests, the Internet of things is the Internet of things. This has two meanings: first, the core and foundation of the Internet of things is still the Internet, which is an extension and expansion network based on the Internet; Second, its client extends to any goods and goods, information exchange and communication, that is, mutual information. The Internet of things is widely used in the integration of networks through intelligent sensing, identification technology and pervasive computing and other communication sensing technologies, which is also known as the third wave of the development of the world information instry after the computer and Internet. The Internet of things is the application development of the Internet. It is not so much a network as a business and application. Therefore, application innovation is the core of the development of the Internet of things, and Innovation 2.0 with user experience as the core is the soul of the development of the Internet of things< There are many people doing MLM in the name of the Internet of things. I hope you are alert to the definition of MLM: MLM refers to the organizer's development personnel, who calculate and pay remuneration based on the number or performance of the personnel directly or indirectly developed by them, Or the illegal act of requiring the developed personnel to obtain wealth by means of membership qualification on the condition of paying a certain fee. The essence of MLM is "Ponzi scheme", that is to say, the money of later comers is distributed to the income of former comers
new type of MLM: no restrictions on personal freedom, no ID cards and mobile phones, no collective classes, but to use capital operation as a banner to pull people to cheat money, drive luxury cars, wear gold and silver, etc., attract your relatives and friends with money, and finally make you lose your money
only the people's Bank of China has the right to issue currency, and any other enterprise that issues currency is a pyramid scheme fraud
the original shares will not be issued in this way. It needs professional securities companies to operate. Other indivials say that the people who can pay for the original shares are basically pyramid schemes
if someone says that it's the original stock currency, and points need personal information, it can be basically confirmed as pyramid selling
please like to let more people see and purify the network environment< There is no advertisement, just to remind people not to be fooled
f=N μ N is the positive pressure, that is, the pressure acting on the contact surface, μ It is the dynamic friction coefficient, which refers to the influence factors of the roughness of the contact surface on the friction. Or use the balance f = f; It's only used when it's stationary or moving in a straight line at a constant speed, but it's the most used in junior high school
the so-called friction is the force that hinders the relative motion of the object, and the direction of friction is opposite to the motion direction or relative motion direction of the object. The conditions of friction are as follows:
(1) two objects must contact each other
(2) there was extrusion between two objects(3) there is a tendency of motion or relative motion between two objects
If an object is stationary on a horizontal plane, it will not be affected by friction if it is not pushed or pulled. If thrust or pull is received, it belongs to the category of static friction. The size of friction is equal to that of pull or thrust, and has nothing to do with the gravity or pressure of the object. Only the maximum static friction is related to the pressure or gravity on the object
if the object is not pushed by 10N force, the object will be subjected to static friction, which is equal to the thrust. Just push with 15N force, and the friction force on the object is the maximum static friction force. If the thrust force is increased later, the friction force will not change. Theoretically, the sliding friction of objects is less than the maximum static friction, but it is generally considered that they are equal
The friction force is f = 15-10 = 5N
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methods to increase beneficial friction
(1) increase the roughness of contact surface
(2) increase the pressure (3) change rolling friction into sliding friction (1) replace sliding friction with rolling friction(2) make the contact surface separate [form a layer of air cushion or magnetic suspension on the contact surface of the object]
(3) decrease the pressure (4) rece the roughness of the contact surface In engineering technology, people often rece friction by applying lubricating oil. The science of this problem is called tribology, which is a branch of mechanical manufacturingIf two objects, which are in contact with each other and squeeze each other, but relatively still, only have a relative sliding trend under the action of external force, but do not have relative sliding, then the force between their contact surfaces hindering relative sliding is called "static friction". When the static friction increases to the maximum, the object will move
size: the static friction varies according to the external force, but there is a maximum value, which is called the maximum static friction. The maximum static friction is slightly greater than the sliding friction
direction: tangent to the contact surface, opposite to the direction of relative motion trend
On the basis of a large number of experiments, G. amunton and C. - A. de Coulomb proposed the following law of friction in 1699 and 1781:① the friction between two objects in contact does not exceed a certain maximum value, which has nothing to do with the size of the contact area
(2) the maximum value of friction is proportional to the normal pressure n between two objects (3) the direction of friction is opposite to the sliding direction of the object, and its magnitude is directly proportional to the normal pressure n between the two objectsthe above conclusion is only a rough empirical rule, but because it was found in the early days of mechanical science, it was called the law of friction, also known as Coulomb's law