Columbia miner

1. Did the DMG team run? The price of DMG currency has been falling. After the agreement announced the immediate cessation of operation, the management token of DMG's defi money market has fallen by 90%. Unfortunately for the supporters of the defi money market foundation, the value of the DMM token plummeted as the team behind it revealed that they had stopped all operations e to regulatory considerations< br />
< First, DMM stopped operation

the defi money market used to be a loan platform, causing some serious concerns in the cryptocurrency community. One of the reasons – this is a popular defi project, supported by some celebrities, including drapper gorenholm – Tim Draper, the partnership between alon Goren and Josef Holm, committed to investing in blockchain solutions

unfortunately, supporters of the project received bad news today as the team behind DMM announced that it would stop operations immediately

e to the inquiry from the regulatory authorities, DMM is being closed. With immediate effect, mtoken casting is no longer available. Although the interest rate of mtoken will be reced to 0% around February 10, 2021, the redemption of mtoken will be provided indefinitely. At present, there is capital and interest available to redeem all outstanding mtoken and accrued interest. – Read the official website

however, e to many changes in the price of protocol management token DMG, many communities have lost great value, which shocked the community< Second, the price of DMG is 90%

the management token of DMM, and the price of DMG has plummeted by 90% in less than 60 minutes. It rose from more than $0.50 to about $0.05. The market is still open, so it has recovered slightly, but it is obviously not good for those who fail to dispose of the token in time

FTX, one of the exchanges where DMG uses leverage to trade, also provides some enlightenment for the event. Sadness depends on what happened with DMG today. We will keep the DMG market open and allow people to trade according to their needs. Leverage is likely to dominate a lot of the time. We don't know what evil has happened, but we will investigate in the abnormal price mode.

2. National policy does not support it. Plus foreign coal imports. Make coal instry depressed. mining engineering employment is not a problem, but the treatment is not good, and hard work, poor conditions.

3. 1、 Find problems and change students' understanding
in order to make students realize the importance of calculation, I first carried out an activity among students: let students collect the mistakes they often make in calculation, which can be carried out by each student himself or through group cooperation, and record the staggered questions after two weeks, including the reasons for the mistakes, It depends on who is looking for it seriously and who is looking for the wrong reason. When the students' enthusiasm is aroused, they shake off the problems:
(1) wrong reading, wrong ing and scribbling. 6 and 0, 1 and 7 are ambiguous
(2) when the column is vertical, the digits are not aligned
(3) do not draft when calculating
(4) one digit addition and subtraction calculation errors lead to errors in the whole question< There are two reasons for "carelessness" from the calculation errors of some students: one is that children's physical and psychological development is not mature enough, the other is that they have not formed good study habits. On the one hand, it is a natural growth process; on the other hand, it can be cultivated by corresponding methods. Therefore, while guiding students to analyze the reasons, it is necessary to highlight the cultivation of students' good learning habits, which is the key to improving their computing ability and the basic requirement of quality ecation< Second, cultivate students' good habit of calculation. Most of the mistakes in calculation are caused by careless, careless and scribbled writing. Therefore, a good calculation habit is the guarantee to improve the calculation ability. In the calculation training, students are required to do one look, two think, three calculate, four check
1. Look: it's serious. How can the result be correct if all the questions are copied wrong? Therefore, students are required to check with the original question or the previous formula in time when ing questions and calculating each step, so as to avoid ing wrong numbers or symbols. There are three points to be done: 1) check with the original question after ing the question; ② Check the numbers on the vertical type with those on the horizontal type; ③ Check the number in horizontal form with that in vertical form
2. When guiding students to do a calculation problem, they should not pick up a pen to do the calculation. They must first examine the problem, make clear what the problem should be calculated first and then, and whether there is a simple calculation method, then they can do the calculation. In addition, the calculation must be accurate first, and then fast
3. Calculation: to write and calculate carefully. The writing of assignments and exercises should be neat, not scribbled, and the format must be standardized. The writing of numbers, decimal points and operational symbols in the title should be especially standardized. There should be appropriate intervals between the numbers, and the vertical type on the draft should be aligned and organized. The calculation should be concentrated and not rush
4. After the calculation, we should first check whether the calculation method is reasonable; Secondly, check whether the numbers and symbols are copied wrong, and whether the decimal point is written wrongly or omitted; Thirdly, we should check and calculate every number and final result in the process of calculation. Therefore, it is an important way to cultivate good learning habits to prevent calculation errors and improve calculation ability< Third, to cultivate students' oral calculation ability and lay a solid foundation.
oral calculation is a calculation method that directly calculates the number by thinking and memory, which is an important part of calculation ability. Therefore, to improve students' calculation ability, we must lay a good foundation for oral calculation
1. In order to improve the accuracy and speed of students' oral arithmetic, I consciously ask students to memorize some special mathematical combinations according to their knowledge structure, such as sum is two numbers of whole ten and whole hundred (73 and 27, 98 and 2, etc.); The proct is two numbers (25) of the whole ten and the whole hundred × 4，125 × 8, etc.); The memory of these results is not only helpful to improve the accuracy of students' calculation, but also greatly improves the speed of students' calculation
2. Arrange exercises in each class. According to the teaching content and students' actual situation, each mathematics class chooses the appropriate time, arranges 3-5 minutes of oral arithmetic practice, and each student prepares a Book (daily practice of oral arithmetic). In this way, it is carried out for a long time, perseveres, and receives good results
3. For example: visual arithmetic training, listening arithmetic training, oral arithmetic, oral arithmetic games, "confrontation", "relay race" and so on, to improve students' adaptability< Fourth, strengthen the teaching of estimation. Estimation can cultivate students' sense of number, guide students to understand "operation" deeply, and help students check the correctness of calculation results. Estimation method can be used to locate the calculation results in advance and quickly determine the value range of calculation results, It can avoid mistakes caused by carelessness. Let the students look at the last digit of the result. If the indivial digits are 3 and 8, the sum of the indivial digits of the result must be 1, and the multiplication must be 4, such as 13 × In a word, the cultivation of students' computing ability should be carried out in the whole process of primary school mathematics teaching. We should not only strengthen the training of students' basic skills, but also pay attention to the targeted training of students. As long as we carefully study, constantly summarize and improve the work, and seriously dig out the ability factors in the calculation problems, the students' calculation ability will be improved.

4.

1、

once, when it was time to eat, Edison still didn't come back. His parents were very anxious and looked around for him. They didn't find him in the grass shed by the yard until the evening. When his father saw him lying motionless in the grass with a lot of eggs, he asked Edison what he was doing. Little Edison replied that he was hatching chickens. At that time, his father pulled him up with anger and laughter and told others that he could not hatch chickens. On the way home, he was puzzled and asked, "why can't I, when hens can hatch chickens?"

When Edison was a child, he often played in the mill of his neighbor Muir Winchester's house. One day, in Winchester's mill, he saw that Winchester was experimenting with a kind of flying device with a balloon, which fascinated Edison. He thought that if a man's stomach was full of air, he would go up to heaven. A few days later, Edison mixed several kinds of chemical materials together and gave them to his father's assistant, Michael Oates. Edison told Michael Oates that people would fly after eating this kind of food. As a result, Oates almost fainted after eating Edison's "flying agent"

Thomas Alva Edison was born in Milan, Ohio and died in West Orange, New Jersey. Inventors, entrepreneurs

Edison was the first person in human history to use the mass proction principle and electrical engineering research laboratory to engage in invention patents, which had a significant and far-reaching impact on the world< br />

5. The chronology of Edison's invention and creation:
on October 11, 1868, he invented the "voting counter" and obtained the first patent right in his life
in October 1869, we set up "pop Edison Company" with friends
in 1870, he invented the general printing press, granted the patent right, and obtained US $40000. We set up our own manufacturing plant in New York< From 1872 to 1876, he invented the electric animation mechanical and electrical telegraph, automatic repeating telegraph method, double and quadruple telegraph method, and made wax paper carbon resistor< In 1875, the acoustic analysis resonator was invented< In 1876, the first instrial research laboratory was established in Monroe Park, New Jersey. It is the origination of the concept of modern "research group". Invention of carbon rod transmitter. Patent application for automatic telegraph recorder< In 1877, the telephone invented by Bell was improved in Monroe Park and put into practical use. Obtained three patents: perforated pen, pneumatic iron pen and ordinary iron pen. On August 20, he invented the phonograph, which proved to be Edison's favorite project< In 1878, Edison claimed to solve the problem of electric lighting. The Royal Society of England held a phonograph exhibition. Improved gramophone, design microphone, loudspeaker, sound engine, tuning engine, microcalorimeter, taste meter, etc. On February 19, it won the patent of phonograph. In July, he went to Wyoming with Professor pike of the University of Pennsylvania to observe the total solar eclipse, and measured the temperature of the whole body around the sun with his thermometer. In August, he returned to Monroe Park and re invested in scientific research and experiment. Britain approved Edison's patent application for "VCR". William Wallace, who visited Connecticut in September. He began to study the invention of the electric lamp. A patent application for platinum wire "electric lamp" was filed on October 5< From 1879 to 1880, the high resistance incandescent lamp was invented after thousands of setbacks. Improve the generator. A new method of current distribution, circuit alignment and calculation are designed. Invention of lamp holder and switch. Invention of magnetic ore separation method< On August 30, 1879, Edison and bell demonstrated their own telephone devices in the city hall of Saratoga Creek. As a result, Edison's telephone was clearer than bell's. The high resistance incandescent lamp was invented on October 21, and it was lit continuously for 40 hours. On November 1, the company applied for the patent of carbon filament lamp. On December 21, the New York Express reported on Edison's incandescent lamp. On December 25, 3000 visitors from New York City gave a public light show at Monroe park
Helicopter Research in 1880. Obtained the patent right of electric lamp invention. The magnetic screen is made. On January 28, the patent for "power transmission and distribution system" was submitted. On February 18, scribbler published Edison's electric light, which officially published the invention of electric light. In May, the first "Columbia" ship illuminated by electric lights was successfully tested
Edison Electric lighting company of New York was established in December
1881 New York Fifth Avenue headquarters was established. Set up an incandescent lamp factory in New York. Set up generator, underground wire, lamp parts factory. Test tram at Monroe park
1882 invention of three wire current distribution system. 141 patents were applied. The first central factory was set up on September 4. At the end of December, more than 150 small power stations were built across the United States< On May 23, 1885, he filed a patent for wireless telegraph
from 1887 to 1890, the cylindrical phonograph was improved and more than 80 patents were obtained. Operating gramophone, record, speaker and other manufacturing and distribution business< The phonograph was invented in 1888
participated in the Paris Centennial Exposition in 1889. Many kinds of electric railways were invented. Complete the activity video
from 1890 to 1899, we designed large-scale stone crusher and grinder. Personally directed the large-scale development of iron ore with new methods at Ogden mine< In 1891, Edison concentrator was invented and began to operate mining business. Obtained the patent of "motion picture projector". On May 20, the first successful motion picture mirror was shown to the public at the Edison laboratory in West Orange, New Jersey< In 1893, the world's first film studio was built in the courtyard of Edison's laboratory
on April 14, 1894, the first activity movie projector theater was opened in New York
on April 23, 1896, it was the first time that the film was shown in the "Vita projector" at the Coster Bayer Concert Hall in New York, and it was warmly welcomed by the public
in 1902, a new type of battery was used for the test of vehicle power, with a journey of 5000 miles. Every time the battery was charged, it could walk 100 miles, which was a success< In 1903, Edison's company proced the first feature film train robbery< In 1909, it took ten years for the battery research to succeed. Make a fax telegram. Obtained the design patent of raw material machine, fine grinding machine and long kiln< From 1910 to 1914, the disc gramophone was completed without damaging the records and diamond records. Complete the audio projector< In 1910, disc record was invented
in 1912, he invented the sound film. A phonograph has been developed
in 1914-1915, the synthetic manufacturing method of calcium carbonate was invented, and the combination of phonograph and language teaching machine was a remote writing machine. One telephone can automatically record the other's speech. Self made benzene, indigo oil, etc< In 1915-1918, 39 inventions were completed, among which the most famous ones were torpedo mechanism, flamethrower and underwater periscope
finished growing time records in 1927
rubber was successfully extracted from wild grass in 1928.

6. Edison (1847-1931) was a famous American inventor. He was diligent, studious, thoughtful and hardworking all his life. At the age of 75, he also went to the laboratory on time every day to check in for work. For decades, he worked for more than ten hours every day and read for three to five hours in his study at night. If we calculate by the activity time of ordinary people's life, his life has been doubled. So Edison, on his 79th birthday, said to people with pride, I'm 135 years old. He lived to be 84 years old. He made 1100 inventions in his life. His greatest contributions were the invention of phonograph and automatic telegraph, the experiment and improvement of incandescent lamp and telephone. Edison began to study electric lamps in his early twenties. It took him more than 10 years. He used thousands of different materials, such as bamboo, cotton, graphite, tantalum, and so on, as filament materials to carry out experiments. He often reached the top of the sky. Once, he and his assistants worked continuously for five days and nights. In 1879, Edison used carbon filament as incandescent filament and ignited it for 40 hours. Because the surface of carbon fiber is porous, brittle and low strength. It was soon replaced by tungsten wire< In 1883, Edison discovered the phenomenon of hot electron emission, also known as "Edison effect", that is, some electrons or ions near the metal surface get enough kinetic energy e to the high temperature, so as to overcome the binding of the surface and escape from the metal. Edison effect is very important for the operation of all vacuum tubes. The cathode, as the emitting surface, is often coated with alkaline earth metal oxide to facilitate electron emission, and heated by electric current to maintain high temperature< In 1900, Edison invented the iron nickel battery, which is an alkaline battery with electromotive force of about 1.3-1.4 V, long service life and low efficiency. Edison had many inventions in his life, but when asked why he succeeded, he said: some people think that I have any genius, which is incorrect. "Genius" is one percent inspiration, 90 percent

7.

Edison's growth story:

1. Once, when it was time to eat, Edison still didn't come back. His parents were very anxious and looked around for him. They didn't find him in the grass shed by the yard until the evening

when his father saw him lying motionless in the grass with a lot of eggs, he asked Edison what he was doing. Little Edison replied that he was hatching chickens. It turned out that when he saw that hens would hatch chickens, he felt very strange and always wanted to try it himself. At that time, his father pulled him up with anger and laughter and told others that he could not hatch chickens. On the way home, he was puzzled and asked, "why can't I, when hens can hatch chickens?"

When Edison was a child, he often played in the mill of his neighbor Muir Winchester's house. One day, in Winchester's mill, he saw that Winchester was experimenting with a kind of flying device with a balloon, which fascinated Edison. He thought that if a man's stomach was full of air, he would go up to heaven

a few days later, Edison mixed several kinds of chemical materials together and gave them to his father's assistant, Michael Oates. Edison told Michael Oates that people would fly after eating this kind of food. As a result, Oates almost fainted after eating Edison's "flying agent". As a result, Edison was whipped by his father and alerted by his parents. He advised his children not to play with Edison and stay away from him

extended materials:

Edison's full name is Thomas Alva Edison. He was born in Milan, Ohio and died in West Orange, New Jersey. Inventors, entrepreneurs

Edison's main achievements:

1. On October 11, 1868, he invented "voting counter"

In 1870, the general printing press was invented

From 1872 to 1876, he invented the electric animation mechanical and electrical telegraph, the automatic repeating telegraph method, the double and quadruple telegraph method, and the wax paper carbon resistor

In 1875, he invented the acoustic analysis resonator

In 1876, he invented the carbon rod transmitter. Patent application for automatic telegraph recorder

In 1877, the telephone invented by Bell was improved in Monroe Park and put into practical use. Obtained three patents: perforated pen, pneumatic iron pen and ordinary iron pen. On August 20, he invented the phonograph, which proved to be Edison's favorite project

Electric lamp was invented in 1878

From 1879 to 1880, the high resistance incandescent lamp was invented after thousands of setbacks. Improve the generator. A new method of current distribution, circuit alignment and calculation are designed. Invention of lamp holder and switch. Invention of magnetic ore separation method

On August 30, 1879, Edison and bell demonstrated their own telephone devices in the city hall of Saratoga Creek. As a result, Edison's telephone was clearer than bell's. October 21 invention of high resistance incandescent lamp

In 1882, the three wire current distribution system was invented

From 1887 to 1890, the cylindrical phonograph was improved

In 1888, the phonograph was invented

In 1889, many kinds of electric railways were invented

In 1909, it took ten years to study the battery, and finally succeeded

In 1910-1914, the disc gramophone was completed without damaging the records and diamond records

In 1910, "disc record" was invented

In 1912, he invented the sound film. A phonograph has been developed

In 1914-1915, he invented the synthetic manufacturing method of carbolic acid, and combined the phonograph and the language teaching machine as the remote writing machine. One party's telephone can automatically record the other party's speech. Self made benzene, indigo oil, etc

In 1915-1918, 39 inventions were completed, among which the most famous are torpedo mechanism, flamethrower and underwater periscope

In 1928, rubber was successfully extracted from wild grass

reference source : Internet - Thomas Alva Edison