San Wen blockchain

blockchain includes public blockchain, joint (instry) blockchain and private blockchain. Public chain point-to-point e-cash system: bitcoin, smart contract and decentralized application platform: Ethereum

blockchain is a new application mode of distributed data storage, point-to-point transmission, consensus mechanism, encryption algorithm and other computer technologies

blockchain is an important concept of bitcoin. In essence, it is a decentralized database. At the same time, as the underlying technology of bitcoin, it is a series of data blocks generated by using cryptographic methods. Each data block contains a batch of bitcoin network transaction information, Used to verify the validity of its information (anti-counterfeiting) and generate the next block

extended data

according to the different degree of blockchain network centralization, three kinds of blockchains under different application scenarios are differentiated:

1. The blockchain with the whole network open and without user authorization mechanism is called public chain

2. The authorized nodes are allowed to join the network, and the information can be viewed according to the authority. It is often used in the inter agency blockchain, which is called alliance chain or instry chain

3. All the nodes in the network are in the hands of one organization, which is called private chain

alliance chain and private chain are also called licensing chain, and public chain is called non licensing chain

blockchain features

1, decentralization. Blockchain technology does not rely on additional third-party management institutions or hardware facilities, and there is no central control. In addition to the self-contained blockchain itself, each node realizes information self verification, transmission and management through distributed accounting and storage. Decentralization is the most prominent and essential feature of blockchain

2. Openness. Blockchain technology is based on open source. In addition to the private information of all parties involved in the transaction is encrypted, the data of blockchain is open to everyone. Anyone can query blockchain data and develop related applications through the open interface, so the information of the whole system is highly transparent

3. Independence. Based on consensus specifications and Protocols (similar to various mathematical algorithms such as hash algorithm used by bitcoin), the whole blockchain system does not rely on other third parties, and all nodes can automatically and safely verify and exchange data in the system without any human intervention

4. Safety. As long as 51% of all data nodes cannot be controlled, the network data cannot be arbitrarily manipulated and modified, which makes the blockchain itself relatively safe and avoids subjective and artificial data changes

5. Anonymity. Unless there are legal requirements, technically speaking, the identity information of each block node does not need to be disclosed or verified, and the information can be transferred anonymously

1. dig down alternately, don't dig under your own feet

2. when digging a cave, surround your own vertical mine in the cave. Interested players can explore in the cave, please refer to the following cave mining method

3. when the lava is excavated, it is buried with sand

4. when you see the pebble you didn't put, dig it up and dig out the monster cage inside; When you see the stone bricks, please thicken the wall of the mine to avoid being blown up by Guli

6. after the bedrock is excavated, four squares up are the most suitable for digging diamonds, and two squares up are suitable for digging iron

7. dig a large space as a transfer station after reaching the desired number of floors, and then excavate a mine road with one grid wide and three or four grids high around. Please design the distribution of the mine road yourself

8. after the ore is excavated, it should be put into the box of the transfer station as soon as possible and brought back to the ground

9. when you dig a cave, please plug it. When there is magma flowing out, quickly retreat, and then plug it with something that can't be burned. Be careful to burn your hands

10. the first step is to build pickaxes after mining

When the filling mining method is used to mine the ore body, the mining area is also divided into two steps: room mining and pillar mining. It is characterized by the use of filling materials to fill the space after mining with the progress of mining. There are two functions of filling materials: one is to maintain the upper and lower wall rock of the mine house; The second is to form a worktable, where the staff stand on the filling material for drilling, blasting and ore drawing. This mining method is mainly used for: (1) the ore is stable but the surrounding rock is not stable enough

1. Overview

e to the continuous development of proction, the allowable filling mining method has also been improved. In recent years, the use of water sand filling mining method in underground metal mines is graally increasing. The essence of water sand allowable filling method is to transport the allowable filling materials to the working face for filling along the pipeline system with the help of water

2. Typical scheme

Fig. 5-5-16 is a typical scheme of upward horizontal slicing and wall protection slag hydraulic filling mining method in Tonglushan Copper Mine. The deposit of the mine is a copper mine with steep dip and extremely thick ore body, with high grade. The ore is copper bearing magnetite, hard and stable. The surrounding rocks are skarn, marble and granodiorite, which are moderately stable. There are lakes on the surface of the earth, so it is not allowed to collapse. According to the above characteristics, the water sand filling mining method is adopted

mining area division and constituent elements are several mining areas in each stage. When the thickness of the ore body is more than 10-12m, the mining area is arranged perpendicular to the strike of the ore body; When the thickness of ore body is less than 10-12m, the mining area is arranged along the strike. Each mining area is divided into room and pillar. When the mining area is arranged vertically, the width of the room is 7m and the width of the pillar is 9m. The thickness of roof pillar is 4-6m, the height of bottom pillar is 5-7m and the height of stage is 60m

the vein crossing roadway is driven on the boundary line between the room and pillar to meet the needs of both room and pillar mining. The vein crossing roadway is mainly used for ore transportation and prospecting. Its section is 2.4m × 75m with monorail

according to the design requirements, a filling raise is set every 30-40m along the length of the mine room. In principle, the filling well should be located in the center of the stope to fill the whole stope equidistant. There are two kinds of filling well specifications: when the bucket method is used for construction, the cross section is 1.8m × 2m When the common method is used, the cross section is 1.8m × 1.5m The filling well is divided into two compartments, namely, between ladders and between filling pipes. The filling well is mainly used to lower the filling material and return air

the pedestrian filter well is mainly used for pedestrians, water filtration, air intake and lifting materials and equipment. According to the requirements of safety proction, a stope should be equipped with at least two filter wells. When the stope is long, more than two should be set up. The cross section of the filter well is 1.8m × 1.8m, which should be divided into two compartments: one is the ladder room and the other is the lifting material room

chute is mainly used as caving mine, and its section size is 1.5m × 1.5m and 1.8m × 1.5m. Its section size should be more than 3 times of the maximum allowable block size. A fan-shaped pneumatic gate with single or double cylinders is installed at the lower part of the chute

the pedestrian filter well and chute should be arranged at intervals in the stope, which is convenient for pedestrian, water filtering and ore drawing

the cutting work is to excavate the bottom pulling roadway (cutting roadway) along the long axis of the mine room above the floor pillar, connect each filter well and chute, and then take the roadway as the free surface to expand the side, pull all the bottom of the mine room to form a bottom pulling space of 2.0m high, and then carry out the roof lifting of 2.5-3.0m. After all the ore is transported out, the reinforced concrete bottom plate shall be built with the thickness of 0.8 ~ 1.0m, and the concrete grade shall be 100 ~ 150

4. Mining work

the mining method of upward horizontal slicing is adopted in the mine, and the slicing height is 2.0m. When the ore is stable, the mining height can be increased to 4-5m, that is, the filling can be carried out after two layers of continuous mining. This can rece the auxiliary operation time and improve labor proctivity

the rock drill was used to drill the upward blast hole to collapse the ore, and the hole depth was 1.6m. After ore caving, horizontal blasthole is drilled by rock drill to press the top. The height is 1m, which not only increases the height of ore caving, but also ensures the specification and stability of stope

(1) masonry precast block: in order to ensure the smooth mining of pillars, concrete partition wall (also known as wall protection) should be poured before stope filling. In the past, wood formwork was set up when pouring concrete, but now it is replaced by masonry concrete precast block to save a lot of wood

the specification of precast concrete block is 300m × 200m × 500mm, each piece weighs 21kg. The thickness of partition wall shall not be less than 0.6m. In order to prevent the built precast concrete block wall from being overpowered by the filling material, the precast concrete block cross brace is built every 5-7m between the precast concrete block wall and the mine wall for reinforcement

(2) heightening along road patio: at the same time of concrete brick wall construction, heightening along road pedestrian shaft and chute. The heightening height is 2.0 m. A 3 cm thick wooden formwork is erected in the shaft along the road, and concrete precast blocks are built outside. A gap of 0.2-0.3m shall be left between the wood formwork and the precast concrete block to facilitate concrete pouring. 0.2m for filter well and 0.3m for chute. When the filter well is built with prefabricated blocks, 1-2 filter holes shall be reserved on each side. When the water sand is allowed to be filled, these holes shall be blocked with 1-2 layers of straw bags, and the water shall be filtered after filling. After the water is filtered out, the gap between the Bush formwork and the concrete block is poured with concrete. This kind of water filtering measure is simple and reliable, but it is only suitable for filling materials with good water filtering performance, such as furnace slag. Tonglushan mine is filled with furnace slag

(3) furnace slag filling: all preparations must be made before water sand filling, including installation of filling signal, connecting pipe, water discharge test tube, etc. The stope filling pipe is 4-inch ordinary steel pipe. The forward filling method is adopted, that is, from the filling yard to both ends of the mine room. In this way, the accumulated slag pile can be used as a support for erecting filling pipes in the stope, and the pipes can be connected forward while filling sand, which is also convenient for the operators. The filling height of slag is 1.8-1.9m. The sand filling capacity is 40-45m < sup > 3 < / sup > per hour. The sand filling concentration is about 40%. After the completion of slag filling, the surface of slag in the stope is always uneven. Therefore, manual leveling is needed, and the labor intensity is high. Therefore, mechanization of leveling should be realized. This is an important research topic

(4) concrete pouring: set up a concrete mixing station on the surface, transport the concrete to the underground after preparation, and then put it down to the stope by pipeline through stope filling well, and transport it to the pouring place by tramcar. In the concrete partition wall, the thickness of pouring concrete is 0.4m

the function of the concrete floor is to separate the caving ore from the filling material, which is also a necessary measure to rece the ore loss and dilution in the room mining. At the same time, it also creates good ore drawing conditions for the loader, which is concive to improving the ore drawing efficiency of the loader. The thickness of the concrete floor is 0.15 ~ 0.2m, which can be ensured not to be damaged ring ore collapse

the pouring concrete partition wall, bottom plate and along road shaft should be constructed at the same time. After the completion of concrete construction, it also needs a certain curing period, and the operation can be started only after reaching a certain strength

Fig. 5-5-17 schematic diagram of dry filling mining method (a-projection, b-stereogram)

Fig. 5-5-18 schematic diagram of box support filling mining method

Fig. 5-5-17, FIG. 5-5-18 and Fig. 5-5-19 are schematic diagrams of dry filling mining method, box support filling mining method and cemented filling mining method respectively

Fig. 5-5-19 schematic diagram of cemented filling mining method

We need it

1. Regular licenses of food and beverage manufacturers: business license, tax registration certificate, proction license, health license and other local regulations

2. Mineral water proction license: mineral water registration certificate, mineral water intake certificate

5. The marketing of packaging drinking water enterprises is the most important factor to decide the success or failure. Please learn more and build a marketing team with strong learning and practical ability

if the successful bidder or the winner provides false documents to conceal facts, colludes maliciously, bribes the competent department or the evaluation committee and its members, or wins the bid or wins the bid by other illegal means, the result of winning the bid or winning the bid is invalid, and the bid or bidding security paid will not be returned

the competent authorities shall register the winning bidder and the winning bidder, obtain mining license and protect the legitimate rights and interests of the winning bidder and the winning bidder according to law

if the competent authorities sign the transaction confirmation, win the result of competition or fail to handle the mining license according to law, the superior competent authorities shall order them to make corrections within a time limit, and the directly responsible persons in charge and other directly responsible persons shall be given administrative sanctions according to law; If losses are caused to the winning bidder or the winning bidder, the winning bidder may apply for administrative compensation according to law

Many players in my world dig water when they are mining. They are all confused. They don't know what to do. In fact, it's very easy. So, what should I do when I dig water in my world? Now by the iron net for you to bring my world mining water solution

My world's solution to water mining In my world, if you encounter abandoned mines, or when you are mining, you often find magma or water. If you dig to the seaside, it's easy for the seawater to pour in. Where the seawater comes in, you will be washed away

In this case, friends can block up the water with stones. If it's mining, there will be a lot of stones in the backpack. As long as the stone is blocked against the place where the water comes in, the water that has been poured in will be blocked. If the water is on the plane, it will flow back

But if there is a pit, then the water will stay in the pit. The water left in the pit can be collected in buckets. But the bucket can only collect static water, so there is no way to meet the flowing water. Take an empty bucket and face the place where you just poured water, which is the source of water. Click to collect water

If it's water that can't be collected, there are two ways. One is to use magma. If the magma is put into the water, the water will turn into a pebble and it can be g out. Another is sponge, which can suck up water

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