Summary 1, "Science": The mystery of the formation of large diamonds finally cracked! (Read the original) From "Kalinan" discovered in South Africa in 1905, to "Lesidi La Rhone", which was born in Botswana in 2015, almost every large diamond is famous in the world. just now...
1, "Science": the mystery of the formation of large diamonds finally cracked! ( read the original ) From "Calinan" discovered in South Africa in 1905, to "Lesidi La Rhone", which was born in Botswana in 2015, almost every large diamond is famous in the world. Now, scientists have announced that they have solved the mystery of the formation of these rare and precious stones.
Researchers at the Gemological Institute of the United States reported in the latest issue of the journal Science that large diamonds may originate from the ultra-deep parts of the surface 400 km to 750 km, formed in liquid metal. This discovery will help advance the understanding of the deep environment of the planet.
Wang Wu, director of the research and development department of the American Gemological Institute, who participated in the study, said: "For half a century, people have been exploring the formation mechanism of natural diamonds. However, due to issues involving value and insurance, it is difficult for scientists to have the opportunity to study. Large diamonds, so for a long time we know little about the causes of large diamonds and their geoscience."
2. Future technology trends of superhard material cutting tools ( read the original )
Superhard materials such as diamond and cubic boron nitride are commonly used in high speed machining processes and difficult to cut materials. This paper discusses the analysis of three aspects of superhard materials. First of all, the high-speed milling of cast iron by PCBN makes it have high hardness, good thermal conductivity, and is not easy to react with iron materials. Thermal cracking due to thermal gradient differences during high-speed milling is one of the technical challenges. Second, carbon fiber reinforced plastic (CFRP) was drilled using a diamond plating tool. CFRP materials are used in aircraft fuselage, main structure and component preparation. The carbon fiber in CFRP has a high hardness and is therefore suitable for processing with a diamond-plated cemented carbide tool. Finally, the direct milling of the cemented carbide by the BL-PCD (Binderless Nano Polycrystalline Diamond) tool in the mold preparation process is also discussed.
3, Australia synthetic new diamond: hardness is 58% higher than ordinary diamonds ( read the original )
Australian scientists have recently made a breakthrough in the development of blue silk mullite under artificial conditions. However, the current artificial blue silk is only used for industrial purposes and cannot be used in the decorative field.
Recently, Australian scientists have created a rare diamond that has a 58% increase in hardness compared to regular diamonds.
The Australian National University Laboratory produced a nanoscale blue silk garland. Unlike ordinary diamonds, which consist of a carbon cubic lattice, the special feature of the blue silk is that it is an atomic hexagonal structure, which makes it harder than ordinary diamonds. Scientists predict that this diamond will be harder than the existing diamonds in nature. The results were published in the Science Report of the Nature magazine published on November 29.
In 1967, scientists discovered blue silk stones in the debris of meteorites. In nature, it is currently only produced during a meteorite impact on the ground.
“The atomic hexagonal structure of this diamond makes it much harder than other diamonds. We are now able to produce nanoscales, which is exciting because, in general, such materials are smaller and harder.†Australian National Jodie Bradby, lead researcher at the University Laboratory, said in an interview with the media.
4. Optical and electronic properties of boron-doped diamonds ( read the original )
In this study, a homoepitaxial boron-doped single crystal diamond film was grown on an Ib-type diamond substrate by microwave plasma enhanced chemical vapor deposition. The Raman characterization shows that there are a few additional bands and zone center phonon modes in the low wavenumber domain. As the boron content in the film increases, the surface modification and decrease of the center phonon line are observed. The surface morphology of the film was observed to modify with the increase of boron content by atomic force microscopy. Stepped clustering occurs on the surface of the doped film; the difference in activation energy of the carrier indicates that the performance of the thin film semiconductor has two different conduction functions.
5, the State Key Laboratory of Superhard Materials Ma Yuming won the first Walter Cohen Award ( read the original )
6, Harvard uses pink diamonds to create the smallest atomic-scale radio receiver ( read the original )
Harvard scientists have created the world's smallest radio receiver with components built on an atomic scale, using tiny atomic scale defects in pink diamonds. Researchers at the Harvard University's John Paulson School of Engineering and Applied Sciences have placed radio receiver assemblies in two-atom-sized components that can withstand extreme environments. The assembly is also biocompatible, meaning it can be placed in the human body and this diamond defect is known as the nitrogen vacancy (NV) center.
The last point means that the NV center can convert information into light, making it a large and potential system for quantum computing, photonics and sensing. Building a radio receiver requires five components, including power, receiver, transducer, speaker, and tuner. Scientists use green lasers to energize electrons in the NV center.
7, the new money for diamond companies is coming! But first you have to understand the situation of women and divorce ( read the original )
For the relationship between marriage and jewelry, JWT's analysts gave an interesting metaphor:
“Actually, the existence of many companies is based on the marriage system, such as diamond jewelry companies, it will be a little bit more difficult now. But in fact, many companies are caught in a misunderstanding – marketing strategies always revolve around ' Marriage must be as long as a diamond.
But once a marriage is no longer considered an eternal, what should a jeweler do?
The truth is that the words are not kind: the high divorce rate in China may help the diamond retail industry.
Because De Beers conducted a consumer survey in the United States, he found some interesting phenomena: Americans bought a diamond ring for 20% more than the first marriage.
Therefore, jewelers have no reason not to believe that the sales performance of China's second wedding diamond ring may have the same trend as the United States. In this way, their chances seem to be one more.
Therefore, when diamonds lose the symbol of love, the Chinese jewelry retail industry has ushered in a new life of regaining "eternal". .
8. [Overview] Development and Prospects of Intelligent Manufacturing in the Machine Tool Industry ( Read the original )
The machine tool industry is a strategic basic industry that is related to the national economy and national defense. The machine tool is the working machine for the intelligent manufacturing of the equipment manufacturing industry. Without the intelligentization of the machine tool, the intelligent manufacturing of the equipment manufacturing industry cannot be realized. Accelerating the development of intelligent machine tools is the key and foundation for the implementation of "Made in China 2025" to build a strong country.
China is in the development stage of CNC machine tools. There is a certain gap between high-speed, high-precision, multi-axis linkage control, multi-channel composite processing, network communication and other numerical control technologies. At present, the intelligent technology of CNC machine tools in China is still in its infancy, and most of the CNC machine tools produced in China at present are not yet equipped with intelligent functions. In recent years, after scientific research, some intelligent technologies have begun to test and apply, and have achieved positive results.
9. The "Diamond and Abrasives Engineering" magazine participated in the 12th International Conference on Ultra-precision Machining of China and Japan ( read the original )
November 4-6, 2016, sponsored by China Production Engineering Society (CPEI), Japan Precision Engineering Society (JSPE), National Natural Science Foundation of China (NSFC), Hunan University, National University of Defense Technology, China Precision Engineering and Micro-Nano Organized by the Technical Professional Committee, the 12th China-Japan Super-precision Machining International Conference CJUMP, co-organized by China's abrasive processing professional committee and China Surface Treatment and Surface Engineering Committee, was held in Changsha. The conference delegates totaled 200 people. 51 articles.
10, "death tax rate": the majority of corporate tax burden in China exceeds its ability to bear ( read the original )
The manufacturing industry that has been “going away†has caused a lot of thinking, and the burden of taxes and fees has become the target of public criticism.
Recently, the news about Cao Dewang, the chairman of Fuyao Group, investing 1 billion yuan in building an automobile glass factory in the United States has caused extensive public discussion. At the same time, Foxconn parent company Hon Hai Group also announced in a recent announcement that it is evaluating potential investment opportunities in the US. Therefore, many people said that "Cao Dewang is going to run" and "Foxconn is going to run."
In this regard, Cao Dewang pointed out in an interview with the media that the United States does not have a value-added tax, only 40% of the income tax, combined with various production costs, compared with the production in China, the total production profit in the United States will be 10% more. The rising cost of manufacturing in China has become the reason why Cao Dewang is considering relocation.
In the first half of this year, Li Shuguang, the chief professor of finance at Tianjin University of Finance and Economics, led a research group to investigate the tax burden of private entrepreneurs, during which he discussed with more than 100 entrepreneurs. The preliminary results of the survey show that entrepreneurs believe that the tax burden is very heavy and the proportion of heavier is very high, reaching 87%.
Li Shuguang said that the current 30%-40% macro tax burden is too high for enterprises, and can even be called the "death rate." Because most companies in China have a profit margin of less than 10%, the tax burden of 30%-40% will cause most eastern coastal processing enterprises to be in trouble and even lose their profits.
Regarding Li Shuguang’s investigation of “just in timeâ€, is the “death rate†to determine whether China’s macroeconomic development is too biased? Although some manufacturing companies that choose to leave will still focus on China, this leaves us with a lot of reflections. How should the next tax reform go?
Related Reading:
The World Bank reports that Chinese companies have a total tax rate of 68% and more than 10 taxes : http://
Cao Dewang: VAT is the biggest burden on the company. Half of the operating profit is taxed : http://
The female entrepreneurs who can't keep going, crying and crying, the tax burden of private enterprises is obvious : http://
The truth behind Cao Dewang's "running the road": the corporate tax burden is too high (video): http://
The mechanical fuel level gauge integrates liquid level detection and display (without any external device), which can display liquid level directly and is easy to install. It is widely used in gasoline tank, diesel tank, hydraulic station and water tank of all kinds of generators and engines.
Mechanical Fuel Level Gauge,Fuel Level Indicator,Fuel Tank Level Gauge,Diesel Tank Level Gauge
Xi'an Gavin Electronic Technology Co., Ltd , https://www.gamicos-meas.com