What sparks will be generated by blockchain culture and tourism
however, it's easy for people with an eye to see why there is no security layer? In fact, several key features of blockchain have already solved the security problem. First, the blockchain uses asymmetric encryption technology. In fact, encryption and decryption are different keys, namely public key and private key. In short, the public key is open to the public, while the private key is absolutely confidential
secondly, distributed bookkeeping is a way for blockchain to store data. It can also be understood as distributed storage, which is consistent with the concept of decentralization. In the form of ledger, there is no central ledger in the network, and the ledger is stored in each node. Each node is not only independent, but also can act as the central node. Therefore, the central node will not be attacked, leading to the loss of core books or data, and the whole network will not be paralyzed
moreover, tamper proof is the basic feature of blockchain. As long as the chain can not be modified, and can not be deleted. If it needs to be changed, based on the principle of transparency and openness, the whole network and all nodes need to be informed. Therefore, under the democratic mechanism, the possibility of tampering with data at will is very low. Therefore, blockchain technology is applied in various instries, such as finance, payment, traceability, games, etc., such as the network "universe", Tencent's "come together to catch the demon", and Zhongan Huanyu blockchain "Dr dragon hunt" are the safe and high-quality procts under the blockchain technology.
mobile phone can not be charged, which is generally caused by the following reasons:
1. Mobile phone battery problem
generally, the probability of mobile phone battery failure is relatively small, but once the battery problem occurs, we must pay attention to it. If there is no problem with the mobile phone charger and the mobile phone system, you need to check the battery of the mobile phone. If the battery of the mobile phone is found to expand, it means that there is a problem with the battery of the mobile phone, and you should stop using it immediately. At the same time, the battery can not be disassembled by itself, so as to avoid the explosion of the expanded battery, which will bring more serious consequences
2. Mobile phone system failure
the mobile phone can not be charged, which may be caused by the mobile phone system failure. The solution is to turn off the mobile phone directly, and then restart the mobile phone to check whether the mobile phone charging returns to normal
3. Charger failure
if the charger of mobile phone charging fails, the mobile phone will not be charged. The solution is to try charging with other chargers with the same interface. If it can be charged normally, it can be determined that it is the problem of the charger. Just replace it with a new charger
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extended information:
mobile phone charging skills
1. Many users often leave their mobile phone on while charging, which will easily damage the service life of the mobile phone, because the circuit board of the mobile phone will heat up ring charging, and at this time, if there is an external phone, it may proce instantaneous return current, Damage to the internal parts of the phone
2. The battery life depends on the number of repeated charging and discharging, but it can be charged as it is used, because a charging cycle is not a charging cycle or a cycle, but depends on the degree of charging. If you use 50% full charge and then use 50% full charge, these two times are considered as one
When not in use, Ni MH battery will discharge at about 1% of the remaining capacity every day, and Li ion battery will discharge at 0.2% ~ 0.3% every day. When charging the battery, try to use the special socket, do not share the socket with TV and other home appliancesthe following reasons may be responsible for the sudden failure of charging the mobile phone
1. Mobile phone system failure
the mobile phone can not be charged, which may be caused by the mobile phone system failure. The solution is to turn off the mobile phone directly, and then restart the mobile phone to check whether the mobile phone charging returns to normal
2. Charger failure
if the charger of mobile phone charging fails, the mobile phone will not be charged. The solution is to try charging with other chargers with the same interface. If it can be charged normally, it can be determined that it is the charger problem, and it can be replaced with a new charger
3. Poor contact between the charger and the mobile phone
improper contact between the charger and the mobile phone will also lead to the failure of charging the mobile phone. At this time, unplug and connect the data line and the mobile phone again, and unplug and connect the data line and the charging head again. Only when the charging head and the data line are fully connected with the mobile phone, can the normal charging be carried out
extended information:
mobile phone charging skills
1. Before the battery leaves the factory, the manufacturer has activated it and pre charged it, so the battery has surplus power. A friend said that the battery is charged according to the adjustment period, and the standby is still seriously insufficient. Suppose the battery is genuine, In this case, the adjustment period should be extended and 3 ~ 5 times of complete charge and discharge should be carried out
2. If the newly purchased mobile phone battery is lithium-ion, the battery has been activated before leaving the factory. The user only needs to use it normally, and can unplug the charger when it is full
3. When the indicator light of some automatic intelligent fast chargers changes, it only means that they are full of 90%. The charger will change automatically and charge the battery with slow speed. Use the battery after it is fully charged, otherwise it will shorten the use time
Before charging, lithium battery does not need special discharge, improper discharge will damage the battery. When charging, try to use slow charging to rece fast charging; Do not exceed 24 hours. After three to five complete charge and discharge cycles, the internal chemical substances of the battery will be all "activated" to achieve good use effect5. Please use the charger of the original factory or brand with good reputation, and use the special charger for lithium battery, and follow the instructions, otherwise the battery will be damaged or even dangerous
If you are using a Huawei mobile phone and can't charge when connecting the charger, please operate as follows:
1. It is recommended that you use the standard charger and charging cable for charging
2. If your mobile phone is not used for a long time, or does not charge the mobile phone in time after low power off, the battery may be over discharged. It is recommended that you connect the charger and charge it for more than 30 minutes to see if the mobile phone reacts
3. If your mobile phone can be turned on, please confirm whether there is poor contact or damage of charging equipment
please check if the data line, charger and socket are in poor contact. It is recommended to plug and unplug again
please check whether the connector and socket are clean. If st is found, it is recommended to clean them with a soft brush and then recharge them for confirmation
please check whether the data cable, charger and socket are damaged. If damaged, please stop using and replace them
4. It is recommended that you replace other chargers that can charge normally and try to charge. If the charger can be charged normally after replacement, it may be the charger and data line fault. If it cannot be charged, it may be the problem of the mobile phone itself. It is recommended that you back up your data in advance and take your mobile phone, charger, data line and purchase voucher to Huawei customer service center nearby for inspection
If the mobile phone is not used / charged for a long time, the battery power will be completely consumed, and the battery may be overdischarged. It is recommended that you connect the charger and charge it for more than 30 minutes to see if the mobile phone reacts
precautions:
< UL >please use the original charger to charge the battery to ensure that the charging voltage is stable and meets the standard
please try not to charge the battery until the battery charge is less than 20%. The more the battery is discharged, the greater the loss of the battery. It can be used and charged at any time to prolong the service life of the battery
please do not leave the battery idle for a long time, and charge the battery irregularly. If the mobile phone is not used / charged for a long time, the battery power will be completely consumed, resulting in abnormal charging or failure to charge
if the above methods can't solve the problem, please back up the important data and take the purchase invoice to the service outlets for consultation