bluuebunny/crossref_metadata_2025 huggingface dataset:
Glucose-6-phosphate induced changed of stomatal aperture in an irradiance dependent manner
Authors: Di-an Ni , Ma-ye Gao , Liang Jin , Dong-mei Yin , Zhang Zhi-guo , Ruan Yong-Ling
Published: February 2021

Hexokinase catalyses hexose phosphorylation, which is the key step of sucrose metabolism. In this study, stomatal apertures ofArabidopsisepidermal peel were detected with or without exogenous application of mannose, fructose, glucose, and glucose-6-phosphate (G-6P). The results here showed that G-6P, but not glucose itself, induces stomatal closure inArabidopsis. Furthermore, detection of stomatal apertures ofArabidopsishexokinase loss of function with exogenous application of glucose showed that glucose induced stomatal closure was not due to osmotic pressure and it triggered guard cell ROS production depend on hexokinase activity. The effect of irradiance and G-6P on regulation ofArabidopsisstomatal aperture was investigated. The data obtained here indicated that G-6P induced changes of stomatal aperture depend on irradiance.
Cangnan printing & packaging industry renovation and VOCs governance experience
Authors: peipei Chen , Owanlu Jia , jingrun Chen , mengbin Li
Published: February 2021

The total content of volatile components emitted by ink accounts for 70%-80% during the process of drying. Various approaches, such as forcing law enforcement, stricting standards, improving governance efficiency, have been used to reduce the VOCs pollution. All these approaches not only improved the environment of workshop and regional air quality, but also promoted the standardized development of the industry.
Characteristics of the community-structure of A2O processes under different dissolved oxygen conditions in plateau areas
Authors: Yuanwei Li , Hao Kaiyue , Guo Mingzhe , You Junhao , Zong Yongchen
Published: February 2021

This study conducted a Pilot-Scale Anaerobic-Anoxic-Aerobic Process (A2O) experiment in a highland city of Linzhi. Four Dissolved oxygen (DO) working conditions of 2.0, 1.5, 1.0, and 0.5 mg/L was designed in this experiment. The 16SrRNA gene sequencing was performed on sludge from the anaerobic, anoxic and aerobic tanks. Through the composition analysis of sludge on Phylum, Class and Genus level, it can be found that the number of bacterial community at each level of the bacterial community was relatively low. Indicators of community richness, community evenness and community diversity were relatively low compared to other regions. The bacterial communities at different levels are significantly different from the reported dominant community and abundance. Correlation analysis between environmental factors and bacterial community structure proved that DO had significant correlation with bacterial community structure (P<0.05). The removal rates of the total phosphorous (TP), Total nitrogen (TN), Ammonia nitrogen (NH3-N) and Chemical Oxygen Demand (COD) were all affected by the sample communities structure. The composition of the bacterial community structure included nitrifying bacteria, denitrifying bacteria and polyphosphate-accumulating organisms, but the abundance was relatively low. The results also showed that the dominant community in different DO conditions and different reactors has large differences.
Study on LNG leakage and diffusion in dangerous goods logistics park
Authors: Zhang Kaituo , Tan Chao , Lv Zhiyong , Chen Rui
Published: February 2021

In this paper, according to the idea of “forward model algorithm of leakage and diffusion”, the research on LNG leakage and diffusion in dangerous goods logistics park is completed, the main research contents are as follows: 1) An improved forward Gaussian diffusion model of LNG is established to modify the parameters according to the specific environment of dangerous goods logistics park. 2) The safety trace software is used to simulate the process of LNG leakage and diffusion in the hazardous materials logistics park. The applicability of the improved Gaussian diffusion model in the case of LNG tank leakage in the dangerous goods logistics park is verified by the influence of the downwind distance of the concentration contour line and environmental factors on the leakage and diffusion.
Study on the removal of hydrogen sulfide from natural gas by titanosilicite zeolite
Authors: Bowen Qi , Chen Ying , Li Yanju , XiuboTian  , Ma Luwei
Published: February 2021

The presence of hydrogen sulfide in natural gas will reduce the calorific value of natural gas, so hydrogen sulfide in natural gas needs to be removed. Titanosilicalite zeolite is a stable porous material with good catalytic effect and has attracted much attention due to its excellent catalytic oxidation performance in the system composed of it and hydrogen peroxide. Therefore, in this paper, the removal of hydrogen sulfide in natural gas was studied by using titanosilicalite zeolite as catalyst and hydrogen peroxide as oxidant, and the mixture of hydrogen sulfide and nitrogen gas was used as the simulated gas of natural gas. The experimental results show that the titanosilicite zeolite has a good catalytic effect on hydrogen sulfide. The influence of the concentration of hydrogen peroxide, reaction temperature and pH of the initial solution in the process of removing hydrogen sulfide by titanosilicalite zeolite was studied.
HPLC-Based Quantitative Detection of Tylosin in Soil
Authors: Wang Kang , Yu Shaopeng , Zhou Jia
Published: February 2021

The sample was extracted under the ultrasonic assistance and purified through the solid-phase extraction, and then the residual tylosin in soil was detected via the high-performance liquid chromatography (HPLC). Acetonitrile-aqueous solution was used as the extracting agent in the ultrasound-assisted extraction. The HLB solid-phase extraction column was activated using 5 mL of methanol and 5 mL of ultrapure water, leached with 5 mL of water and 5 mL of 2% ammonium hydroxide + 5% methanol solution, and eluted with 5 mL of methanol in the end. The determination was implemented using the HPLC method, where the detected wavelength λ value was 290 nm, the sample size was 20μL, and the column temperature was 30°C. Acetonitrile -0.01 mol/L monopotassium phosphate solution (pH=2.5) = 60:40 (V: V) was taken as the mobile phase in the detection of response degree to tylosin in soil. The detection results were as follows: LOD was 0.019mg/kg, LOQ was 0.062mg/kg, the coefficient of variation of intra-day precision was smaller than 10%, and that of inter-day precision was smaller than 15%.
Study on the mechanism and influencing factors of SF6 decomposition products
Authors: Lijun Fu , Guan Yanling , Zhang Liang , Jin Haiquan , Wang Han , Jing Yuanchi
Published: February 2021

The decomposition products of GIS basin insulators have characteristic components under four conditions: different defects of GIS basin insulators, cracks and surface discharge of insulation parts inside GIS, abnormal heating of silicon packing basin insulators under steady state current, and particulate discharge of insulation parts. The characteristic components of decomposition products of SULFUR hexafluoride are introduced. Different mechanisms of decomposition products in partial discharge defects and abnormal heating defects were analyzed. The effects of partial discharge defects, abnormal heating defects and adsorbents on the decomposition products were studied.
A Potential Synthesis Routine of Microketide A and B, Polyketide from a Fungus in Southern China Sea
Authors: Wu Yudian
Published: February 2021

In this paper, a synthesis routine of microketide A (1a) and B (1b) is purposed. The microketides are divided into two parts, 2 and 3, and synthesized separately. 2 is synthesized by an ortho-specific alkylation of phenols. 3 is synthesized by first oxidizing and then reducing phenols. The chirality of carbon 6 is ensured by Noyori asymmetric hydrogenation. After 2 and 3 are synthesized, a MBH reaction connects them, providing the microketides A and B.
Study on dielectric relaxation Spectra of Surfactant-free Microemulsion composed of Water / Ethanol / Triethyl Citrate
Authors: Liu Canli , Khan Muhammad Asadullah , Chen Zhen
Published: February 2021

In this paper, the dielectric relaxation behavior of surfactant-free microemulsion composed of pure water / ethanol / triethyl citrate (TEC) from 40Hz to 110MHz was studied. There is an obvious relaxation phenomenon between 103 and 105Hz in the selected experimental path, which is presumed to be interfacial polarization relaxation, indicating that there is a microscopic phase region in the system. The dielectric relaxation parameters fitted by a dispersion term Cole-Cole formula, that is, relaxation intensity Δε and relaxation time t, obviously vary with the phase composition of the system, and different trends can indicate that the system is in different microemulsion phase regions. It is proved that the dielectric spectrum technique can accurately characterize the surfactant-free microemulsion.
Analysis of Three Flavonoids in Jujube Effervescent Granules by High performance liquid chromatography
Authors: Wang Rui , He Youping , Shiwen Hu
Published: February 2021

In this research, high performance liquid chromatography (HPLC) was used to detect the content of rutin, myricetin and epicatechin in jujube effervescent granules. Methanol-0.1% formic acid water was used as the mobile phase, and the UV detection wavelength was 270 nm. The results showed that the content of rutin and myricetin has a good linear correlation (r>0.99) within the range of 1.0 μg to 50 μg, and the content of epicatechin also has a good linear correlation (r>0.99) in the range of 1.5 μg to 100 μg. The recovery of rutin, myricetin and epicatechin were 99.1 %, 98.6 % and 101.8 %, respectively. Furthermore, the total content of the three flavonoids in jujube effervescent granules was 472.19 μg/g, the content of rutin, myricetin and epicatechin was 433.75 μg/g, 6.46 μg/g and 31.98 μg/g, respectively.
Absorption principle and techno-economic analysis of CO2 absorption technologies: A review
Authors: Zhang Chaoran
Published: February 2021

Since the industrial revolution, human activities have led to massive CO2 emissions, and the greenhouse effect has intensified. Therefore, scientists have developed and explored various CO2 capture technologies, such as absorption, adsorption, membrane separation and cryogenic technology. Among them, the absorption technology has been the most widely used. This paper reviews and summarizes the CO2 absorption technologies in the past ten years, introduces the principles of the following six mainstream technologies for CO2 absorption: monoethanolamine (MEA), ionic liquid, calcium looping, microalgae, ammonia, and molten carbonate fuel cells. Through comparing absorption cost, energy consumption, absorptivity as well as the advantages and disadvantages, this paper reveals that calcium looping and ammonia are the relatively suitable technologies at present. The calcium looping has low capture cost and energy consumption, but the reaction capacity of CaO adsorbent decreases rapidly during the absorption process. The absorptivity of ammonia is high and fertilizers (NH4HCO3) with added value can be produced, but the ammonia volatilization problem is challenging. Consequently, the two technologies have their own advantages and disadvantages and should be used considering the actual situation. The conclusions of this paper can guide industries to select CO2 absorption technologies with relatively lower cost, less energy consumption and higher absorptivity.
Ecological Risk Assessment of Typical Heavy Metals in Surface Dust in Z University
Authors: Feng Ruixiang , Liu Meiling
Published: February 2021

With the population increasing, the rapid development of social economy and the continuous improvement of industrialization level, heavy metal pollution becomes more and more serious nowadays. It is becoming more and more urgent to put forward feasible suggestions on the detection and assessment of heavy metals in the environment. Surface dust is an important environmental media, and people can easily intake pollutants from surface dust by daily life breathing, eating or skin contacting at any time anywhere, which will cause chronic harm to the human body directly or indirectly. In order to analyze the pollution of heavy metals in surface dust and assess the ecological risk, we take the campus of Z University as the research area. Through the investigation of the campus layout we’ve collected 23 effective surface dust samples. After sample digestion, the content of 4 kinds of typical heavy metal, such as Cd, Pb, Cu and Zn were determined by atomic absorption spectrometer ZEEnit700P. The method of index of geo accumulation and potential ecological risk index were used to analyze. It was conluded:1. The average content of heavy metal elements Cd, Pb, Cu and Zn in surface dust in Z University is -0.143, 163.56, 76.90 and 106.96mg/kg respectively, which is -0.83, 6.13, 2.5 and 1.28 times as the soil background values of Hubei province, and the level sorting is Pb > Cu > Zn > Cd. The content of Pb is the highest in surface dust heavy metal pollution, which are contributed mostly by tire wear, vehicle emissions and construction content of heavy metals in surface dust in Z University.2. Most area of Z University is in clean condition, except a sample point area is in or above moderate ecological risk level, the whole campus area is safe or only slight potential ecological risk.
Analysis and Research on the Maintenance Funds of Rural drinking water safety Projects
Authors: An Meiyun , Li Shuijun , Liu Liu
Published: February 2021

Since the reform and the opening up, Guizhou has made great achievements in rural drinking water safety projects, creating well-being for the farmers, but how to ensure the long-term and effective performance of the project has always been a major problem in the management and protection of the project. It takes Guizhou province as an example, and concludes that maintenance expenses are the main factor restricting the long-term operation of projects, from the investigation results of different types, scales and modes of projects in typical regions. In order to ensure the long-term operation of projects, the article carries out the research and analysis of the project maintenance funds to provide reference for the management and protection of rural drinking water safety projects in mountainous areas.
Research of Geostatistics on Spatial Distribution of Urban Surface Water Quality
Authors: Sun Hongquan , Wang Jing , Tian Yachong , Shi Yiran
Published: February 2021

The principles and methods of geostatistics are introduced. With the help of variogram, the contents of the water quality. NH4+-N, TP and COD, in rivers in the city of south China are analyzed. By using the Kriging, the special distributions of the content of NH4+-N, TP and COD are simulated. The contours of the spatial distribution of the urban surface water quality are shown intuitively. The research results provide a theoretical basis for governing the water environment.
On the Relationship between Mazu Culture and Marine Civilization
Authors: Jianhuang Meng , Shihhui Pan
Published: February 2021

Mazu belief originated in the Song Dynasty and has never been interrupted for thousands of years as the precious spiritual wealth and excellent cultural heritage of Chinese. Mazu belief is the best embodiment of the profound and rich connotation of Chinese marine culture reflecting the traditional virtues of Chinese. Based on marine culture and spread widely around the world. Mazu belief is closely related to marine culture and marine civilization. Interpreting the relationship between them is of great significance for better understanding of Mazu belief culture and marine civilization. The study of Mazu culture is conducive to better promoting Mazu Spirit and promoting a better construction of a harmonious society.
Research on the Green Transformation of Mining Enterprises Guided by Government Based on Game Perspective
Authors: Hou Jun-hua , Zhu Jin-deng , Peng Zhen
Published: February 2021

In order to effectively solve the pollution problem of exploitation and utilization of geological and mineral enterprises and realize the goal of green transformation of geological and mineral enterprises, this paper USES the static game theory to analyze the interactive mechanism between geological and mineral enterprises and the government in the process of green transformation. The results show that the key factors affecting the game behavior are the government’s punishment, the supervision revenue, the outside supervision strength and the green transformation cost benefit of the mining enterprises. Based on the results of the study, the paper puts forward some relevant countermeasures and Suggestions to promote the green transformation of geological and mineral enterprises in order to form a good situation of government and enterprise co-governance[1].
Prediction of China’s Total Energy Consumption Based on Bayesian ARIMA-Nonlinear Regression Model
Authors: Kun Zhang , Weibing Feng
Published: February 2021

Energy management is the key to China’s economy prosperity and environment protection in the future. This paper makes predictions on whether China’s energy 13th Five-Year plan can be achieved and the trend of energy consumption in the next stage. Aiming at the shortcoming of insufficient extraction of nonlinear features in the energy system from existing energy consumption models, and low prediction accuracy due to single models. Based on the derivation of the joint posterior distribution density function of the stationary ARMA model parameters under the Normal-gamma prior distribution, this paper proposes a Bayesian ARIMA-nonlinear regression energy consumption prediction model. Bayesian parameter estimation makes full use of prior information and Markov Chain Monte Carlo (MCMC) technique gets rid of the tedious calculation of high-dimensional integrals. Compared with the existing model, the improved model has higher prediction accuracy. Its Root Mean Square Error and Mean Absolute Percentage Error are 3452.0294 and 0.4727%. In line with the development goals set out in the 13th Five-Year plan, an empirical study of the fluctuation law of China’s total energy consumption was carried out using data on China’s energy consumption from 1990 to 2019 and its factors. The results show that affected by the Corona Virus Disease 2019 epidemic, the growth rate of China’s energy demand will fluctuate slightly in 2020. By the end of the 13th Five-Year plan, the total energy consumption can reach the expected goal. After the epidemic is under control, energy demand for the whole society will usher in a rebound growth. In the next five years (2020∼2024), China’s energy consumption will continue to maintain a steady upward trend of slowing growth. In view of these situations, this paper suggests that, on the one hand, we should attach equal importance to energy conservation and technology development to improve energy efficiency; on the other hand, we should adjust industrial structure and establish a unified energy management system to promote sustainable development of the energy industry.
A Discussion on the Construction Ideas of Sponge City in A Green Eco-district
Authors: Wei Zhu , Yumiao Li , Chengdan Wang
Published: February 2021

With the continuous enhancement of ecological awareness in recent years, sponge city design has become more professional and secure in green eco-district planning. In this context, in order to give full play to the function and advantages of the green eco-district, it is an irresistible trend to advance the progress of the green eco-district planning and accelerate the construction of sponge city. Based on the above situation, first of all, this paper analyzes the significance and value of sponge city from three aspects of ecological benefit, social benefit and economic benefit based on the construction concept of sponge city. Secondly, the planning and design ideas of sponge city construction are analyzed from the perspectives of compliance with principles and proper planning, planning procedures and measures, and the selection of adaptive technologies.
The measure of agricultural modernization level in Shanxi Province based on entropy method
Authors: Juan Wang , Pengjuan Shi
Published: February 2021

“Three rural issues” has been the party and the country’s attention to the major issues. The development degree of agricultural modernization directly decides the realization of national modernization. By constructing the evaluation index system of agricultural modernization in Shanxi Province and using entropy method to calculate the development level of agricultural modernization in Shanxi Province, the research results show that the level of agricultural modernization in Shanxi Province generally presents an upward trend, but the rising speed is not fast. Through analysis, it is found that the decrease of its sustainable development level leads to the hindrance of agricultural modernization. On the basis of this analysis, this paper combined with the actual situation of Shanxi Province, from the sustainable development, technology, innovation and other aspects of countermeasures and Suggestions.
Operation characteristics and key technology analysis of high-penetration renewable energy microgrid
Authors: Longbo Mao , Shuai Tang , Shu Li , Wenqiang Wang , Weijun Wang
Published: February 2021

With the increasing penetration rate, the strong intermittency and volatility of renewable energy, and the large-scale use of power electronic devices, the safe and stable operation of microgrids has been seriously affected. This paper analyzed the impact of high-penetration renewable energy on power system flow distribution, power quality, operating status, relay protection, etc. And specifically studied several specific keys to improve the operating stability of the microgrid including high-penetration renewable energy.
Research on the Green Development of Space Defense System and Construction Technology of Great Walls in Shahukou
Authors: Shang Ruihua , Qiao Jianfeng , Han Pengju , Qin Huichuan
Published: February 2021

To study the characteristics of green development of the ancient Great Walls, this paper studies the space defense system in Ming and Qing dynasties and construction technology of Shahukou by means of literature review and on-the-spot investigation. The conclusions are as follows. The ancient Great Walls in Shahukou is a large and deep spatial structure which composes of Shahukou pass of Great Walls, Shahu fortress, and different types of piers. The attackers need to occupy city towers over city gates in Shahu Fortress and corner tower over Mamian pier, while the defenders need to carry out fire prevention and anti-collision work for the gate and gate hole in Shahu Fortress. Rammed materials has experienced many stages, such as ginger stone and yellow mud, grass mud, tabia, glutinous grain pulp tabia, and glutinous grain pulp mortar. Timber construction, timber component, and timber formwork were existed timber in the construction process in ancient Great Walls. The reason why large area of covered bricks lost was that a through joint was formed between the brick layer and the rammed soil.
The Influence of Air Quality on Solar irradiances in most air polluted months in China
Authors: Fei Zeng , Jinye Zhang , Ruibei Liu , Hui Lv , Mingjie Wang , Ling Yang
Published: February 2021

Solar energy, as a kind of clean and sustainable energy, is widely used in most countries, and the number of PV generators is increasing year by year in China. The solar energy generation directly depends on the amount of solar irradiance, which is easily affected by atmosphere situation. With the rapid development of urbanization and industrialization, the atmosphere situation in China become worse and worse, and the air is always heavily polluted in recent years, which will reduce the irradiance getting to the ground. In order to analyze the effect of air quality on the solar irradiance, we analyze three kinds of solar irradiance Direct Normal Irradiance (DNI), Global Horizontal Irradiance (GHI), and Diffuse Irradiance (DIF). The influence of the Air Quality Index (AQI) on DNI, GHI, DIF are analyzed from November to February in the most air polluted months in recent four years for Beijing, Harbin, Shanghai and Guangzhou. The date when the AQI was the local maximum(minimum), DNI and GHI were the local minimum(maximum), and DIF was also the local maximum(minimum) are selected. The results shows that DNI and GHI decrease, and DIF increases with the increase of AQI,. The six-order polynomial is used to fit the difference of the three irradiance and the difference of AQI. The average fitting coefficient R2 for GHI is 0.8855, DNI is 0.8529 and DIF is 0.8466, and the highest R2 for GHI is 0.9748, DNI is 0.9794 and DIF is 0.9820.
Hubei flavor batter lotus root stuffed with meat innovation and nutrition
Authors: Ding Hui
Published: February 2021

Bat lotus root stuffed with meat, also known as lotus, is a kind of fried food wrapped with batter. It is crispy and golden outside, tender and juicy. It is popular among people. The innovation of dishes with meat has regularity and rationality: ingenious conception, high conception and complete nutrition.
Fabrication and characterization of the enhanced tensile strength xanthan/curdlan/gelatin blend films for food-packaging applications
Authors: Zhu Yu
Published: February 2021

Food packaging films are generally used to protect the food from outside harsh environment. Moreover, their main purpose is to prolong the shelf life and to maintain the freshness of food. Generally, plastic materials are widely used for this purpose. However, these plastic materials are causing a serious threats to our environment due to the problem of non-degradability. In this regard, biodegradable biopolymer materials are contemplated as an important alternative due to the environment friendly characteristics. However, the packaging films prepared from single pure polymers have been reported to possess very poor mechanical properties. Therefore, blending of two or three biopolymers is considered to synergistically improve the mechanical properties of biopolymer based films. In this work, we made a novel blended films of xanthan (X), curdlan (C) and gelatin (G) by mixing different ratios of all three polymers. After successfully preparing and optimization of these blended films, mechanical properties and moisture absorbance properties of all these films were determined. Based on the results, it was concluded that the highest tensile strength of 38.22±0.7 MPa was found in the T2 treatment of 20:20:60 ratio of X/C/G blend films. In addition, highest elongation at break of 18.92±0.5% was also found in the same rational of X/C/G blend films. Moreover, characterization techniques such as FT-IR and SEM analysis were also performed to analyze the structural properties of blend films. Finally, SEM micrographs indicated that all the blend films exhibited a uniform, smooth, homogenous and compact outer surface morphology. In short, this novel xanthan/curdlan/gelatin films resulted in improved mechanical properties of blend films, which confirm its suitability as promising food packaging material.
An improved centroid localization algorithm based on acoustic for proton range verification
Authors: Ye Jiaquan , Yang Jun , Tang Kun , Lanxin Nie
Published: February 2021

The proton beam generates a unique acoustic signal, which can be used for range verification. It is a crucial issue to use the acoustic signal for accurate positioning. The propagation of sound waves emitted by a proton pulse(20 MeV, 1 × 107protons) is simulated, and acoustic signals are recorded. The distance between sensors and Bragg Peak is calculated by the time of arrival and speed of sound. An improved centroid localization algorithm based on trilateration is presented to locate the Bragg Peak with the distance. After evaluating the verification accuracy of different methods, the results show that this algorithm significantly improves the verification accuracy.
Research on Operation Performance Evaluation of Listed Mining Enterprises in Jiangxi Province Based on DEA-BCC Model
Authors: Jun-hua Hou , Xiao-di Zhang , Feng Zhen
Published: February 2021

In the new economic environment, in order to further expand and strengthen the local mining industry and realize the sustainable development of geological and mineral resources, it is necessary to effectively transform the advantages of geological and mineral resources into industrial and economic advantages with scientific operation performance management. Based on this, this paper constructs a DEA-BCC model for performance evaluation of geological and mining enterprises in Jiangxi province, and conducts evaluation and research on the operational performance of geological and mining enterprises in Jiangxi Province. The research shows that in recent years, the mining enterprises in Jiangxi province have been developing well on the whole. However, some enterprises have too small scale and poor production efficiency, so they should strengthen cost control, appropriately expand scale, pay attention to scientific and technological innovation development, and improve the quality of employees to improve the level of business performance.
Research on Control Technology of Distributed Power Generation Virtual Synchronous Generator
Authors: Shuai Tang , Weijun Wang , Shu Li , Longbo Mao , Wenqiang Wang
Published: February 2021

Virtual synchronous generator control technology, as a method that enables distributed inverter power supplies to have similar characteristics to synchronous generators, has an important supporting role in improving the stability of the power system. Based on the rotation equation and electrical equation of the synchronous generator, this paper firstly constructed the virtual synchronous generator topology and mathematical model; then designed the corresponding virtual synchronous generator active-frequency droop control and reactive power-voltage droop control strategies, and through the frequency domain method, this paper analyzes the influence of key control parameters. Finally, the related control strategy is verified in the Matlab/Simulink simulation model. The results show that the proposed control strategy can seamlessly switch between off-grid and grid-connected modes, and has good frequency and voltage support capabilities.
Vertical Transfer of Cd Content Between Two Parallel Currents in Opposite Motion
Authors: Dongfang Yang , Li Qing , Zhang Longlei , Wang Qi , Li Haixia
Published: February 2021

Based on the investigation data about Cd in Jiaozhou Bay in August, 1992, we calculated the horizontal increase amount and vertical diluted amount of Cd content in surface and bottom layers from the southwest waters of the bay to the west waters of the bay mouth, and set up the model block diagram of horizontal and vertical changes of Cd content. The results present that in August, the absolutely increase amount of Cd content in surface and bottom layers was 0.16-0.34μg/L, and the relatively increase amount of Cd content in surface and bottom layers was 51.51-66.66%. In the waters of southwest bay and west bay mouth, Cd content in surface and bottom layers had absolutely vertical diluted amount of 0.24-0.42μg/L, and its relatively vertical diluted amount was 63.63-75.00%. In the horizontal migration process of Cd content in the surface and bottom layers, the horizontal increase amount of Cd content in the surface and bottom layers reached a relatively high level from the southwest of bay to the west of bay mouth. It reveals that in the bay waters, in the parallel and opposite movement of the two currents, the current entering into the bay carried a high value of Cd content, and the Cd content migrated from the water with high content to the water with low content through the diffusion and migration of Cd content. Moreover, the migration direction of Cd content was perpendicular to the parallel movement direction of the two currents. In this way, the low-value Cd content in the outward current was increased, and at the same time, the vertical diffusion, migration and settlement of the high-value Cd content led to the increase of the Cd content in bottom layer in the outward current. In the process of vertical sediment of Cd content in the surface and bottom layers, the current had a low value of Cd content in the bay waters, and the vertical diluted amount of Cd content in the surface and bottom layers reached a high level; in the bay mouth waters, the current had high Cd content, but the vertical diluted amount of Cd content in the surface and bottom layers was also very high. In conclusion, the vertical diluted amount of Cd content in the surface and bottom layers kept a high value regardless of whether the current left the bay or whether the current carried high or low Cd content.
Design of China’s Electricity Market Evaluation Indicators Based on SCP Model
Authors: Kening Chen , Qu Haoyuan , Ma Qiuyang , Luo Zhiqiang , Wenjun Zhou
Published: February 2021

The establishment of China’s electricity market has been conducted since 2015. In order to inform the condition of electricity market operation through evaluation index, this paper proposes an evaluation index system based on structure-conduct-performance (SCP) model, containing three principal aspects: market structure, participant behavior and market benefit. Meanwhile, considering the specific situations in China such as the differences among provinces and the immature rules in the initial stage of market construction, some of the market evaluation indexes should be specially designed in order to adapt to China’s national conditions.
Analysis of the Grey Correlation between Energy Consumption and Economic Growth in Fujian Province
Authors: Yisui Huang , Huang Yan , Jianbin Qiu
Published: February 2021

Based on the data of energy consumption and economic growth in Fujian Province from 2007 to 2018, the correlation degree between energy consumption and economic growth is studied by using grey correlation analysis. The results show that the the gross domestic product (GDP) of Fujian Province is significantly correlated with the energy consumption products. The correlation degree is greater than 0.7. The order of the correlation degree is oil, coal, hydropower, wind power nuclear power and natural gas. The correlation is significant between the total amount of energy consumption and the value added of primary, secondary and tertiary industries in Fujian Province. The correlation degree is more than 0.6, indicating that the economic growth of Fujian Province is more dependent on energy consumption. Fujian Province should optimize its energy structure, vigorously develop clean energy and realize the development strategy of low-carbon economy.
A review of fatigue life prediction method for portal crane
Authors: Ren Li-xin , Ma Jian-qiang , Tong Yao-ting , Huang Zheng-qiu
Published: February 2021

The primary damage cause of crane is fatigue damage. The fatigue life prediction method determines service life and the design of the crane. So it is very important to study the prediction method of fatigue life. This paper summarize the existing prediction methods of fatigue life systematically. The research of fatigue life was involved in mechanics, metal material, vibration mechanics, fracture mechanics, fatigue theory and so on, which made a difference between the predicted result and the actual life. The development of the fatigue life evaluation methods are promoted because of the application of new skills, but it still needs more learning.
Application of transformer heavy load and overload analysis and management system
Authors: Qiang Fan , Yuanyuan Chen , Yi Wen , Qiansu Lv , Ning Xiao , Xun Zhang , Jinjin Wan
Published: February 2021

In recent years, with the development of China’s economy and society, the social electricity consumption increases rapidly. As a support for the development of the national economy, the scale of power grid has expanded. The load capacity of oil-immersed power transformer is an important safety and performance index. Limited load capacity or overload may cause a large area of power grid blackout. Therefore, it is necessary to analyze and control the transformer heavy load and overload.
Distributed Optimization Planning of Rural Transformers Considering New Load and Low Voltage Side Interconnection
Authors: Wang Zhanwei , Chen Haidong , Deng Shiyu , Wu Jian , Li Demin , Li Jiwei , Sun Yueting
Published: February 2021

In order to adapt to the development needs of new load access to rural power grids, solve the problem of low utilization efficiency of related equipment, and take into account economy and power supply reliability, this paper proposes a distributed optimization planning method for rural transformers considering new load and low-voltage side interconnection. First, this paper establishs a load forecasting model that considers new types of loads such as electric heating; secondly, it builds a distributed distribution transformer network planning model with the goal of minimizing overall costs, and applys the Voronoi method to plan distribution transformers; finally, it combines the location of the distribution transformer and its power supply Scope, using the minimum spanning tree theory of graph theory to generate low-voltage line layout schemes. This paper is based on Matlab R2014a simulation platform to plan the distribution of typical power supply areas. The results of calculation examples verify the feasibility of this method, which can improve the economy and reliability of power supply by reducing losses.
A Study on the Safety Assessment for Portal Cranes Based on Analytic Hierarchy Process
Authors: Zhang Bin , Wei Bo-zheng , Ren Li-xin , Ouyang Wei-ping
Published: February 2021

This paper introduces the current safety situation of portal crane and the deficiencies of current supervision methods, and proposes the application of new methods for the safety assessment of equipment. The safety assessment method for portal cranes based on the Analytic Hierarchy Process (AHP) is studied, and the safety assessment method applicable to the portal cranes in service is obtained. By defining the equipment safety performance assessment value D, the real-time status and risk level of equipment can be expressed tangibly and clearly.
Impact of China carbon emissions trading mechanism on industrial competitiveness: Evidence from Beijing
Authors: Lu Min , Wang Yang , Wang Xing
Published: February 2021

Competitiveness change after the establishment of carbon emissions trading mechanism is explored on the basis of Beijing industry energy consumption and carbon price data. It is demonstrated that additional costs incurred by carbon trading mechanism have less effect on the industrial competitiveness. Scenario analysis is also conducted to discuss changes under different price.
The Research and Development of Safety Assessment Software System for Portal Cranes
Authors: Tong Yao-ting , Huang Zheng-qiu , Ren Li-xin , Ouyang Wei-ping
Published: February 2021

The safety assessment index system is formulated for portal cranes according to the operation features of this type of crane. The comprehensive assessment matrix and subsequent assessment results are finalized for all levels of index according to the variable weight analytic hierarchy process (AHP). The safety assessment software system is developed for portal cranes on the basis of above outcomes. Relying on C# programming language, the software has enabled the functions of data acquisition and result processing. In addition, it shows a remarkable utility value of the safety assessment of portal cranes and is capable of the safety assessment for the portal cranes in service.
Evaluation of Cadmium Accumulation and its activity in Northeast China
Authors: jiang Yutong , Zheng Haoyuan , Zhang Jing , Guo Wenmiao , Wang Jun
Published: February 2021

In this study, the concentrations of total Cd and available Cd in different cultivation greenhouses were investigated to illuminate the effect of greenhouse on Cd accumulation and its activation under greenhouse vegetable production (GVP). The results revealed that higher Cd contents (including total Cd and available Cd) accumulated in GVP surface layer (0-20 cm), and increased with duration years. Total Cd contents and Cd activation rate were positively correlated with GVP duration (P<0.05). Cd accumulation and activation in soils were mainly ascribed to anthropogenic input, such as heavy inorganic or organic fertilizer application. For greenhouse sustainability, much more attention should be paid to Cd contents in soils of 13-yr greenhouses.
Research on interactive response strategy of power demandside resources participating in power grid
Authors: Han Song
Published: February 2021

At present, it is difficult to cope with the increasingly severe power supply and demand situation and large-scale renewable energy grid connection demand only relying on generation side dispatching mode adjustment. With the deepening development of energy Internet, new demand side resources such as distributed generation, energy storage and electric vehicles are gradually exploited, and their value is more prominent. In order to adapt to the impact of large-scale renewable energy grid connected operation on the security and stability of power grid, it is necessary to comprehensively sort out the types of power demand side resources and study their participation in the interactive response strategy of power grid, so as to effectively ensure the safe and stable operation of power grid.
Approximation of Propagation Function of Transmission Lines Using Vector Fitting With Aid of a Hybrid Genetic Algorithm and Differential Evolution Algorithm
Authors: Yu Y. , Li Y.J. , Wang D.H. , Ge Q.Y. , Jiao C.Q. , Sun J.W.
Published: February 2021

Vector fitting is a powerful tool for function approximation. However, when it is adopted to approximate the propagation function of transmission lines, the number of poles and corresponding delay times need to be determined beforehand. The conventional determination method is inefficient. In this work, the parameters are determined by a hybrid genetic algorithm and differential evolution algorithm (HybGADE). The proposed approach can result in a better approximation of propagation function, which is proven by a successful implementation to an overhead single core coaxial cable.
Status and progress of membrane separation technology in water capture in flue gas
Authors: Ren Danghui , Li Zhimin , Ding Hongchang
Published: February 2021

The flue gas of power plant contains a lot of water, it is of great significance to save water resources if the water can be recycled and utilized. Gas membrane separation technology, which integrates the advantages of low investment, small area, simple operation and no secondary pollution, is considered to be a feasible technology to effectively realize the recycling of water resources. It has become a research hot spot of flue gas treatment in power plants. This review refers to the completed and ongoing research on membrane separation of water in flue gas and summarizes the advantages and challenges of current membrane-based technologies in water resource recovery.
Mathematical Modeling of bacterial biofilm quorum sensing
Authors: Shen Hanzhen
Published: February 2021

Biofilm refers to an extremely complex and highly organized microbial community attached to the surface of the carrier, which exists widely in the natural and industrial environments and affects human life and health. Quorum sensing is a special information communication system in bacterial biofilms, which is involved in the regulation of a variety of bacterial life habits and physiological processes and is conducive to the better adaptation of bacteria to the external environment. The communication of information in bacterial biofilm has been neglected for a long time, so it is very important to study the quorum sensing process of bacterial biofilm.
Revealing the hiden mystery of Piezo: A phylogenetic study
Authors: Jia Chenyang
Published: February 2021

Piezo proteins are a group of important mechanical-responsive ion channel proteins, which play an indispensable role in the normal physiological process of the organism. Therefore, Piezo proteins have attracted many researchers to develop relevant studies. In this work, an evolutionary tree of the Piezo1 gene was constructed using the gene sequences from National Center for Biotechnology Information (NCBI). Using MEGA, the ancestral gene sequence was constructed and the conserved and variable regions of Piezo1 protein were marked. According to the tree, the evolution of Piezo genes can be analysed, and then it is possible to predict the direction of gene mutation. The pathogenic mutation site to the corresponding regions was also mapped. Although there is still much work to be improved, the efforts to analyze the Piezo 1 gene from an evolutionary perspective is valuable, which might be helpful for future disease diagnosis and individualized therapy.
Basic Theory of Quantum Entanglement and the Possibility of Passing on Information Faster than the Speed of Light
Authors: Xue Yihe
Published: February 2021

Quantum entanglement is the core of quantum physics, which is a part of theoretical physics. This theory is once assumed to be the hope of faster-than-light communication. If the technique is achievable, it would be a great breakthrough in the field of physics. I went through the development history of quantum entanglement and conclude it, which is the main stuff I write about in this article, as it involves many differing and sometimes contradictory opinion of physicists. The main part of my research depends on articles about quantum mechanics. I read them first and extracted the relevant contents to form a complete timeline of development. During my exploration, a conclusion of faster-than-light communication is impossible is arose.
The String Theory: Past and Present
Authors: Chen Beibei
Published: February 2021

String Theory is a theory that could be a candidate for “Theory of Everything.” It does not have a long history, as many scientists had witnessed it evolved overtime. The theory is still considered unprovable today. Since lesser scientists are still focusing on this theory in the present time, this passage will be focusing on how it was developed and explains why it was still a problem left for future generations.
Application of ECRS Comprehensive Anomaly Analysis In Zhangjiakou-bohai Fault Belt
Authors: Hong Li
Published: February 2021

ECRS (earthquake corresponding relevancy spectrum) is one of the statistical methods for quantitative identification of earthquake comprehensive precursor anomalies. It is used to identify and extract precursor anomalies information of observed data. Taking Zhangjiakou-bohai fault belt as the study area, we carry out earthquake comprehensive anomaly analysis on base of ECRS method. According to seismic characteristic of study area, magnitude of target earthquake and initial earthquake in calculation are Ms5 and Ms2, respectively. By case analysis and extrapolation of multi-parameter earthquake relevancy spectrum of different inspection period, we select the proper time-interval which has better prediction efficiency and give quantitative evaluation of research area. The anomaly correspondence rate and earthquake correspondence rate are 6/8 and 8/9, respectively, when anomaly threshold is 0.45 times standard deviation.