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First Principles Study on the Two-dimensional Germanium Arsenide Containing Vacancy
Yi Wei,
Liang Fang,
Xianyu Tong,
Rulin Liu
Issue:
Volume 7, Issue 4, August 2019
Pages:
188-193
Received:
29 May 2019
Published:
19 July 2019
Abstract: Two-dimensional layered materials exhibit exotic optical, electrical and thermoelectric properties, which have drawn worldwide attention in the past decade. As a novel kind of two-dimensional semiconductor, monolayer Germanium Arsenide (GeAs) can be exfoliated from bulk solid and it owns excellent dynamical and thermal stability and tunable bandgap. Based on the first principles calculations, we investigate the geometric structure, electrical and magnetic properties of the pristine, Germanium vacancy (VGe) defected and Arsenide vacancy (VAs) defected monolayer GeAs. In agreement with the experimental results, the pristine monolayer GeAs is a direct bandgap semiconductor with a forbidden band width of 1.48eV. By applying a full spin-polarized description to the system, we find that pristine monolayer GeAs is non-magnetic. Introduction of an atomic vacancy defect in the unit cell of monolayer GeAs can lead to six unequal structures. The most stable structure of monolayer GeAs with VGe is also a direct bandgap semiconductor with a forbidden band width of 0.17eV and is non-magnetic. The most stable structure of monolayer GeAs with VAs can generate a magnetic moment of 0.4μB, and it has desired half-metallic behavior. These intriguing results indicate that both pristine and intrinsic vacancy defected monolayer GeAs are promising candidates for two-dimensional optoelectronics and spintronic devices with high performance.
Abstract: Two-dimensional layered materials exhibit exotic optical, electrical and thermoelectric properties, which have drawn worldwide attention in the past decade. As a novel kind of two-dimensional semiconductor, monolayer Germanium Arsenide (GeAs) can be exfoliated from bulk solid and it owns excellent dynamical and thermal stability and tunable bandgap...
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Research on the Development and Problems of Guandong Province Carbon Emmission Market Construction
Chen Jian,
Liu Chenglin,
Lin Jingchuan
Issue:
Volume 7, Issue 4, August 2019
Pages:
194-199
Received:
18 April 2019
Published:
19 July 2019
Abstract: The climate anomalies around the world are still outstanding. Under the UN's United Nations Framework Convention on Climate Change (the Framework Convention) and the Kyoto Treaty, governments have adopted a country-specific reduction in CO2 initiatives such as greenhouse gas emissions etc.. After experiencing the pilot implementation of the carbon trading rights market in seven provinces and municipalities, in December 2017, the “Chinese National Carbon Emissions Trading Market Construction Plan (Power Generation Industry)” officially launched the national carbon emissions trading system. This paper outlines the empirical measures and development status of the domestic carbon emission trading rights market, lists the development status of the Guangzhou Carbon Emissions Exchange in Guangdong Province, and the shortcomings on carbon accounting, carbon emission data reporting, carbon allowances, etc. It also gives suggestions on the upper layer design, the establishment of sound carbon market infrastructure, capacity building and carbon financial instrument innovation, with a view to the long-term development of low-carbon economy in Guangdong Province that will provide further valuable experience for the construction of the national carbon market.
Abstract: The climate anomalies around the world are still outstanding. Under the UN's United Nations Framework Convention on Climate Change (the Framework Convention) and the Kyoto Treaty, governments have adopted a country-specific reduction in CO2 initiatives such as greenhouse gas emissions etc.. After experiencing the pilot implementation of the carbon ...
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Physicochemical Characteristics of Natural Fruit and Vegetable Fermentation Broth and Monitoring of Its Fermentation Process
Issue:
Volume 7, Issue 4, August 2019
Pages:
200-204
Received:
4 July 2019
Published:
29 July 2019
Abstract: The natural fermentation broth of fruits and vegetables is the fermentation broth obtained from the natural fermentation process of fruits and vegetables. The raw fermentation broth is produced by anaerobic fermentation of fruits and vegetables, so as to form a fermentation beverage with complex components, which can promote digestion and absorption, alleviate constipation and beautify the face. Fruit fermentation can be used not only as a drink, but also as a substitute for highly active dry yeast. It can be added into bread to make natural yeast bread with good flavor and long shelf life and other baking products. It has broad market application prospects. In this paper, physical and chemical indexes (soluble solids content, alcohol content, total acid content) and microbial indexes of natural fermentation products on sale and self-made fermentation broth of fruits and vegetables were determined, and the morphology, size and color of yeast colony in fermentation broth were observed. In order to find the suitable fermentation time, the fermentation processes of two kinds of compound fermentation broth of fruits were monitored continuously and dynamically. The results showed that the contents of soluble solids, alcoholicity, total acid content and yeast count were significantly different among different natural fermentation liquors of fruits and vegetables due to different raw materials, formulations and fermentation time. The content of soluble solids in compound natural fermentation broth 1 (orange + apple + lemon) was reduced from 13.1% to 4.0% and the pH was decreased from 4.2 to 3.1, then slowly increased to 3.3 during the 40-day fermentation at 28°C, while the content of soluble solids in compound natural fermentation broth 2 (apple + pear + lemon) decreased slowly from 12.4% to 8.5% and the pH decreased from 4.4 to 2.9 at the same fermentation temperature and time.
Abstract: The natural fermentation broth of fruits and vegetables is the fermentation broth obtained from the natural fermentation process of fruits and vegetables. The raw fermentation broth is produced by anaerobic fermentation of fruits and vegetables, so as to form a fermentation beverage with complex components, which can promote digestion and absorptio...
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Analysis of the Winning Rate of Asymmetric Antagonistic Games
Li Yan-Bin,
Zhang Hu-Ling
Issue:
Volume 7, Issue 4, August 2019
Pages:
205-208
Received:
13 July 2019
Published:
29 July 2019
Abstract: Game theory is a mathematical theory and method for studying phenomena with the nature of struggle, it is one of the most influential theories in modern social sciences. The idea of game theory is very well embodied in some asymmetric confrontation games. Players decision also count a lot in winning the game, but designers should balance the game by who should occupy the offensive as well as their abilities. This passage simply discusses the construction and the settlement of the simplest model of them—general three-man duel model, then gives out a way to solve the problem of finding the survival rate of any duelist after several given rounds of the game. This method can be extended to general n-man duel model. People who participate in the game usually maximize their own interests through certain rules, This study will provide reference value for the design of rules and the rational decision-making in Game Process.
Abstract: Game theory is a mathematical theory and method for studying phenomena with the nature of struggle, it is one of the most influential theories in modern social sciences. The idea of game theory is very well embodied in some asymmetric confrontation games. Players decision also count a lot in winning the game, but designers should balance the game b...
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Empirical Study on Economic Innovation and Development of Qinghai Biological Park
Liu Yafei,
Gan Shifen,
Ding Shengxi
Issue:
Volume 7, Issue 4, August 2019
Pages:
209-213
Received:
6 July 2019
Published:
29 July 2019
Abstract: The park is a specific area for the agglomeration and development of related enterprises, a booster for speeding up the transformation of China's economic development mode, and an important support for achieving sustainable development. Based on the theory of Park Economic development, this paper investigates the overall economic development status, Park innovation, overall benefits of park enterprises and environmental protection of Qinghai bio-industrial park. The three-level evaluation index system of economic innovation and development in bio-parks was constructed, and the weight of each index and the comprehensive evaluation value of economic innovation and development in bio-parks were calculated by using the entropy method. The analysis finds that there are some problems in the economic innovation development of Qinghai Biological Park, such as the low scientific and technological content of some enterprises, lack of competitiveness; vague definition of government functions, excessive administrative intervention; inadequate infrastructure of the park; low production technology level, high energy consumption, and so on. Functions, strengthening the transformation of infrastructure, increasing the support of enterprises and other countermeasures to promote the economic innovation and development of bio-park.
Abstract: The park is a specific area for the agglomeration and development of related enterprises, a booster for speeding up the transformation of China's economic development mode, and an important support for achieving sustainable development. Based on the theory of Park Economic development, this paper investigates the overall economic development status...
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Analysis on Variation Features of Concentration of Main Air Pollutants in Tangshan
Shi Youyu,
Zhou Quan,
Cao Xiaoxia,
Guo Zihan,
Li Heng
Issue:
Volume 7, Issue 4, August 2019
Pages:
214-219
Received:
2 July 2019
Published:
27 August 2019
Abstract: The quality of air is closely related to the comprehensive competitiveness of a city. Analyzing and discussing the changing rules of various air pollutants and finding out the leading factors affecting the current environmental quality are of great significance for further improving the urban environment and formulating reasonable and economic environmental protection measures. Based on the daily concentrations monitoring data of six major air pollutant(PM2.5, PM10, SO2, NO2, CO and O3) at six monitoring sites of Tangshan urban from 2015 to 2017, the characteristics of the concentration changes of six major air pollutants in Tangshan with time and space were analyzed by statistical analysis. The results showed that the ratio of air quality standard days increased year by year from 2015 to 2017 in Tangshan.The average concentration of SO2 was lower than the second standard in the Environmental Air Quality Standard, the average concentration of NO2, PM10 and PM2.5 was higher than the second standard in the Environmental Air Quality Standard; the Over-standard rate range of the average concentration of NO2 was the highest, ranging from 64% to 93%, that of SO2 was the lowest, ranging from 0% to 3%; The days of PM2.5 as the main pollutant were the most, ranging from 102 to 217 days, and the days of SO2 as the primary pollutant were the least, ranging from 0 to 3 days; the concentrations of SO2, NO2, PM10, PM2.5 and CO were the highest in winter and O3 in summer.
Abstract: The quality of air is closely related to the comprehensive competitiveness of a city. Analyzing and discussing the changing rules of various air pollutants and finding out the leading factors affecting the current environmental quality are of great significance for further improving the urban environment and formulating reasonable and economic envi...
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Study on China's Traffic Development from the Perspective of Sustainable Urban Mobility Planning (SUMP)
Issue:
Volume 7, Issue 4, August 2019
Pages:
220-226
Received:
17 July 2019
Published:
27 August 2019
Abstract: China's urbanization is in the context of high space-time compression. We need to meet many problems and new contradictions and challenges in the past two or three hundred years in the West in a short time. It is of great significance to learn from the advanced experience of developed countries such as the European Union for guiding China's rapid urbanization and ensuring the healthy spatial structure of cities.This paper explores the current situation of high investment and low return in China's transportation construction in recent years. On the basis of re-recognizing the relationship between urban mobility (UM) and urban development, the European urban traffic sociology related research and practice is used to deeply interpret the EU's Sustainable Urban Mobility Planning (SUMP). Combined with the actual situation, this paper finds the point of convergence between the theoretical system and China's traffic situation, and further proposes more targeted suggestions for China's traffic development, in order to provide a valuable reference for China's comprehensive transportation planning in the new era.
Abstract: China's urbanization is in the context of high space-time compression. We need to meet many problems and new contradictions and challenges in the past two or three hundred years in the West in a short time. It is of great significance to learn from the advanced experience of developed countries such as the European Union for guiding China's rapid u...
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Study on Rapid Detection of N-Nitrosodimethylamine in Duck and Poultry Meat
Jie Li,
Jianhuan Li,
Wei Xiang,
Hui Xu,
Bolong Lv,
Qing Wu
Issue:
Volume 7, Issue 4, August 2019
Pages:
227-231
Received:
25 June 2019
Published:
27 August 2019
Abstract: Aquatic animals are susceptible to N-dimethylnitrosamine pollution in water quality or feed, which is a non-negligible problem in food safety detection. Gas chromatography/triple four-stage mass spectrometry combined with QuEChERS was used to detect N-dimethylnitrosamine in duck and poultry meat, and acetonitrile, salting-out agent and purifying agent were used to extract duck and poultry meat samples. The results of detection and analysis showed that the results were good. The standard curve was highly correlated in the range of 5ng/mL to 1000ng/mL (R2 > 0.9997). The recovery of standard sample was 82.51%-115.42%, RSD was 1.89-2.99, instrument detection limit was 4.4ng/mL and method detection limit was 0.44ng/g after adding standard sample and matrix effect treatment. The results showed that the recovery of standard sample was 82.51%-115.42%, RSD was 1.89-2.99, and instrument detection limit was 4 ng/mL. Other methods can reduce the operation steps and improve the detection accuracy.
Abstract: Aquatic animals are susceptible to N-dimethylnitrosamine pollution in water quality or feed, which is a non-negligible problem in food safety detection. Gas chromatography/triple four-stage mass spectrometry combined with QuEChERS was used to detect N-dimethylnitrosamine in duck and poultry meat, and acetonitrile, salting-out agent and purifying ag...
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Effect of Sand Blasting on Single Crystal Superalloy M4761
Lin Xiaohu,
Guo Weihua,
Zhang Qiongyuan,
Wei Xianping,
Gong Xiufang,
Yang Gongxian,
Xi Shengqi
Issue:
Volume 7, Issue 4, August 2019
Pages:
232-238
Received:
8 July 2019
Published:
27 August 2019
Abstract: In this paper, the recrystallization evolution of single crystal superalloy M4761 at different solid solution temperatures after different sandblasting stress and different blasting time is studied. The results show that the sample is treated by solution treatment after blasting. When the solution temperature reaches the γ' phase dissolution temperature, the depth of the recrystallized layer increases rapidly, and the γ' phase dissolution temperature is not reached. The depth of the recrystallized layer grows slowly or Recrystallization does not occur; the depth of the recrystallized layer increases with the blasting time; but as time increases, the growth rate gradually becomes slower overall; the solid solution effect of the single crystal superalloy M4761 is best around 1180°C, a fine γ' phase is obtained and the structure is uniform; the grain boundary is composed of a coarse γ' phase, and the recrystallized region gradually increases in size from the edge of the sample to the grain boundary.
Abstract: In this paper, the recrystallization evolution of single crystal superalloy M4761 at different solid solution temperatures after different sandblasting stress and different blasting time is studied. The results show that the sample is treated by solution treatment after blasting. When the solution temperature reaches the γ' phase dissolution temper...
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Research on Reflection and Rotation Features of Binomial Coefficient Distributions
Zhu Minghan,
Zheng Jeffrey Zhijie
Issue:
Volume 7, Issue 4, August 2019
Pages:
239-248
Received:
8 July 2019
Published:
27 August 2019
Abstract: With the rapid development of frontier neural network, artificial intelligence and big data technology, the related theory and application research of combinatorial mathematics are more and more extensive. The application of binomial coefficient in combinatorial mathematics is an effective way to solve the research of information coding and quantum computation. Binomial coefficients and its distributions are the core topic in probability statistics, and there are many theories and applications related to them.In this paper, the quantification of binomial coefficients and the characteristic of reflection rotation transformation are studied using three-dimensional diagrams. Using variant construction, the combinatorial clustering properties are investigated applying binomial formulas and sample distributions and their combinatorial patterns are illustrated. It is proved that the basic binomial coefficient formula and its extended model have obvious properties of reflection and rotation invariance.
Abstract: With the rapid development of frontier neural network, artificial intelligence and big data technology, the related theory and application research of combinatorial mathematics are more and more extensive. The application of binomial coefficient in combinatorial mathematics is an effective way to solve the research of information coding and quantum...
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Design and Implementation of a Heterogeneous Safety Critical Computer
Issue:
Volume 7, Issue 4, August 2019
Pages:
249-256
Received:
21 June 2019
Published:
27 August 2019
Abstract: In recent years, the rapid development of high-speed railway in our country, followed by a rail safety problem has become the most important issue, as the core of the train operation control equipment, the development of the safety critical computer should be considered, firstly. At present, the mainstream safety critical computers all adopt the method of isomorphism, which can eliminate the multiple non-common fault of the same error structure, but can do nothing for some common fault. In this paper, a heterogeneous safety critical computer design and implementation method is proposed, which adopts the method of heterogeneous hardware and software, and analyzes its reliability and security by using fault tree model.
Abstract: In recent years, the rapid development of high-speed railway in our country, followed by a rail safety problem has become the most important issue, as the core of the train operation control equipment, the development of the safety critical computer should be considered, firstly. At present, the mainstream safety critical computers all adopt the me...
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