bluuebunny/crossref_metadata_2025 huggingface dataset:
Vibration analysis of ship propulsion shafting bearings
Authors: Shuo Chen , Heng Zhang
Published: January 2021

The ship power propulsion system is the "heart" of the ship, and the ship propulsion shafting is the core unit of the ship power propulsion system, and it is an indispensable part of the ship's propulsion torque and thrust transmission. The operating status of the propulsion shafting directly affects the operating conditions of the ship, and even the life of the ship. Bearing load is one of the most important manifestations of the operating state of the propulsion shafting. Focusing on changes in the bearing load can better study the operating state of the propulsion shafting. The research on the steady-state load of ship propulsion shafting meets the needs of ship development and has great value for practical engineering applications. This paper takes the ship propulsion shafting-oil film-bearing structure system as the research object. Through the steady-state load mathematical model of ship propulsion shafting bearings, it reveals the coupling relationship among ship propulsion shafting bearing load, oil film force, and journal position, and establishes the ship The steady-state load calculation method of the propulsion shafting bearings solves the basic theoretical problems of modeling and analysis of the steady-state operating state of the ship's propulsion shafting, and provides theoretical support for the safety prediction, management and evaluation of the ship's propulsion shafting operation.
Research on AC/DC Distribution Network Planning Method
Authors: Hu Ende , Wang Shuai , Song Wei , Zhao Haibo , Chunhui Li , Tian Liang , Liu Zhuo , Shen Zeyuan , Yahong Xing
Published: January 2021

The transition from traditional AC distribution system to future mature AC/DC hybrid distribution mode is an effective means to solve the challenges of high penetration of distributed energy, diversification of energy types, high requirements of power quality and power supply reliability.AC / DC hybrid distribution system can be used in many scenarios by virtue of its technical advantages. This paper analyzes the typical application scenarios of AC / DC distribution network from the perspective of "source network load". Combined with the research status of AC / DC hybrid distribution network, this paper introduces the planning method from three aspects: paper, standard and typical algorithm. Finally, a demonstration project is taken as an example to illustrate the key points of the planning.
Mechanical Properties and Micro Structure of Cement Concrete in Freeze-Thaw Environment
Authors: Lv Xin jian , Yu Lei , Chai Ming ming
Published: January 2021

In order to find the declay law of mechanical property and the performance difference after salty water and fresh water freeze-thaw cycle, freeze-thaw cycle environments under the salty water and fresh water are simulated. The compressive strength, dynamic elastic modulus and the mass lost are tested. The pore structure parameters are also tested by MIP. Plot the pore diameter distribution curve. The result shows that the compressive strength and dynamic elastic modulus are all decreased. The degree of these two properties decreasing under salty water freeze and thaw recycle is more than the one under fresh water. The parameters of porosity and critical pore diameter become larger. The amount of pores whose diameter is between 100nm and 1000nm increase. The amount of pores whose diameter is under 100nm decrease. The deteriorate degree of pore structure is deeper in salty water than in fresh water.
Prediction of electrolyte refresh time for Mg-Air battery
Authors: Park Jongwoo , Jang Kwangyeop , Seo Sangwon , Park Jaehyo , Kwon Wansung , Kim Dongjin
Published: January 2021

In order to understand when to replace the electrolyte of the Mg-Air battery, the effect of the surface area of Metal anode according to the consumption. For each capacity of the Mg-Air battery pack on the electrolyte concentration was calculated, the timing of electrolyte replacement was predicted.
Study on the application of shutdown factors to investment management of 35 kV and above power grid infrastructure projects
Authors: Zhou Ming , Lu Shengwei , Wu Qiang , Jin Sha , Yan Jiong , Sang Zixia
Published: January 2021

With the strengthening of external supervision and the management requirements of internal quality and efficiency improvement of power grid, it is particularly important to improve the lean level of power grid investment. However, the accuracy and scientificity of the current grid infrastructure project investment plan adjustment need to be further improved, and the basis for the completion of investment submission is the on-site construction progress. Therefore, this topic carries out the analysis of the factors affecting the construction progress, including the types of the factors affecting the construction, the depth and breadth of the impact, and the impact of the milestone stage, and takes the analysis results of the shutdown factors as the reference basis for the adjustment of the investment plan, so as to improve the investment management level of the company.
Region search evolutionary algorithm with constraint handling for multi-objective short-term wind-solar-hydro-thermal scheduling
Authors: Liu Yongqi , Zhan Xiaoyan , Lyu Hao , Qin Hui
Published: January 2021

Due to the depletion of fossil energy and environmental pollution, renewable clean energy has been paid more and more attention. This paper researches a multi-objective wind-solar-hydro-thermal scheduling model (MOSWS), whose objectives are to minimize the economic cost and minimize the environmental pollution caused by thermal power generation. The region search evolutionary algorithm (RSEA) with constraint handling method is proposed to solve the constrained multi-objective problems and applied to MOSWS model. From the experimental results, we find that RSEA with constraint handling is able to solve the constrained multi-problems and outperforms MODE-ACM in terms of both convergence and diversity. The RSEA is also applied to hydro-thermal system. The results show that wind-solar-hydro-thermal system can not only increase economic benefits, but also reduce the impact of thermal power generation on the atmospheric environment.
Process of Multiple Channel Gliding Arc Assisted Combustion Near Lean Blow-out Limit
Authors: Wang Weizhen , Jia Min , Cui Wei , Zhang Zhibo
Published: January 2021

Multichannel gliding arcs actuators were designed to enhance the non-premixed combustion of the kerosene (RP-3) and air mixture in a swirl combustor near lean blow-out limit. The instantaneous voltage and current of the multichannel gliding arcs and the 1kHz high-speed CH* chemiluminescence imaging of the combustion process were simultaneously measured to show the characteristics of the process assisted by the plasma. When reaching near lean blow-out limit in a flow rate of 225 SLPM, at the combustor inlet, the emission intensity and projected flame assisted by the multichannel gliding arcs remain the same with decreased fuel flow rates from 3 to 1 ml/min, which assisted by the single gliding arc decreases nevertheless. The flame structure under the influence of plasma actuators with various channel numbers evolves differently owing to the differences in plasma distributions.
Review of Remediation Technologies for Cadmium in soil
Authors: Tang Xin , Ni Yuqin
Published: January 2021

Heavy metal pollution in soil has seriously affected the living environment of human beings. Among all heavy metal pollution, cadmium (Cd) is one of the most difficult to migrate pollutants in soil. In China, more than 11 provinces and 25 regions are rich in cadmium in the soil. At present, many researchers are looking for a proper Cd pollution remediation method. Through literature review and comparative analysis, this study summarized the main repair methods, including physical repair (digging and filling, electro kinetic remediation, frozen soil remediation technology, stabilization technology), chemical curing technology (chemical healing technology, chemical extraction), bioremediation technology (Phytoremediation technology, microbial remediation technology, animal repair technology), and joint repair (Chelating agent phytoremediation, microbial remediation). Finally, we explored the principles of these methods and compared their advantages and disadvantages. It was found that the application and selection of different treatment technologies depended on Cd rich soil area, Cd pollutant content, treatment time and other factors. In the future, the remediation of soil cadmium pollution should be scientifically selected according to the local actual situation and pay attention to the joint application of various methods.
Determination and application of a reasonable drainage rate of coalbed methane in vertical wells in the single-phase flow stage
Authors: Yang Sen , Ni Xiaoming , Tan Xuebin , Zhao Zheng , Chen Peng
Published: January 2021

The determination of a reasonable drainage rate of coalbed methane (CBM) in vertical wells in the single-phase flow stage can provide maximise the transmission of water pressure over distance. Based on the principle of effective stress and Darcy’s law, a mathematical model for dynamic changes of the permeability in the single-phase flow stage was established; on this basis, the relationship between permeability and threshold pressure gradient was experimentally attained; according to the linkage of changes of the transmission distance of water pressure, permeability, and pressure drop in the wellbore in the drainage process, a mathematical model for a reasonable reduction rate of the working fluid level in the single-phase flow stage taking the change of the permeability into account was established. The accuracy of the mathematical model was verified according to practical drainage data from CBM wells in Daning Block in Qinshui Basin, Shanxi Province, China. The results show that the rate of pressure drop decreases in a negative exponential manner with the increase of the drainage time. Different rates of pressure drop were required in coal reservoirs with different permeabilities; when keeping other conditions constant, the larger the permeability of coal reservoirs, the lower the threshold pressure gradient and the lower the rate of daily pressure drop. The research results provide a theoretical basis and reference for the reasonable drainage system in the single-phase flow stage.
Numerical Simulation of Diffusion Absorption Refrigerator
Authors: Zhang Guoyan , Liu Shengyong , Lu Jie , Wang Jiong , Ma Yongtao
Published: January 2021

Based on Fluent software, a mathematical model of thermosyphon pump is established and numerical simulation is carried out to study the influence of riser tube length, tube diameter and immersion ratio on liquid lifting capacity and efficiency. The results showed that: the liquid lifting volume increased with the increase of immersion ratio, whereas the lifting efficiency showed a trend of increasing followed by decreasing. The highest lifting efficiency for a 340mm long, 6mm diameter riser achieved when the immersion ratio is 0.35. With the increasing of the height in riser, the velocity of the gas phase close to the wall in the thermosyphon pump was higher than the velocity along the radial direction. In order to enhance fluid interchange, corners of the refrigeration box were designed to be arc-shaped with a higher corner speed and lower temperature.
A New Control Strategy for Bi-directional DC/DC Converter in DC Microgrid
Authors: Miao Tianze , Liu Xiaona , Liu Siyuan , Wang Lihua
Published: January 2021

The bi-directional DC / DC converter in DC microgrid is a typical nonlinear system which has large voltage disturbance during lead accumulator charging and discharging. In order to solve the problem of voltage disturbance, the linearization of the converter is realized by exact feedback linearization, and the sliding mode controller is designed by using exponential approximation law. The simulation results show that the method has fast response speed, strong anti-interference ability and good steady-state characteristics.
Experimental research on preparation of high strength concrete with rice husk ash instead of silica fume
Authors: Ming Yang , Sun Pengliang , Chen Ping , Wang Yuanhao , Li Ling , Chen Xuandong , Gan Guoxing
Published: January 2021

The effect of grinding time on the properties of low-temperature rice husk ash was experimentally studied, and the feasibility of using rice husk ash instead of silica fume to prepare concrete was studied by comparison with silica fume. The results showed that the best grinding time of rice husk ash is 50 minutes, the concrete with similar properties can be prepared by replacing silica fume with super-fine rice husk ash, and the same enhancement effect can be achieved when replacing silica fume with more than 5%, and the performance was consistent.
A new online monitoring application for high voltage switch based on non-contact current sensor
Authors: Ke ZHAO , Yujie LI , Liang ZHANG , Shaobo CHEN , Guoliang Wang , Linjie WANG
Published: January 2021

High voltage switches are indispensable in power system which will control and protect the high voltage lines. According to the research of high voltage switch equipment accident rate in the international conference on power grid for according, the high voltage switch equipment mechanical failure accidents accounted for more than 70%. Thus, it is meaningful to research the switch monitoring technology and develop an integration device with easy installation and reliable data transmission. In this paper, a new type of non-contact current sensor is used to develop the online monitoring system for the mechanical characteristics of HV switches, which will monitor and analyze the action characteristics of the opening coil, closing coil and energy storage motor.
Construction technology and parameter calculation of air drilling with raise boring machine
Authors: HAN Bo , JING Guo-ye , LI Ang , HAO Hao-jie
Published: January 2021

Based on the characteristics of raise boring technology and air drilling technology, the construction equipment and process of raise boring with air as circulating medium are studied. Raise air drilling equipment includes the hydraulic control system, the air-cooled cooler and the air compressor. The drilling process is that the bit is cooled by the high-pressure air, at the same time, the broken rock debris generated in the drilling process are discharged to the ground, and the high temperature hydraulic oil is cooled by the air-cooler cooler. By the study above, the problems are solved effectively such as heat dissipation, cooling and rock debris collection and discharge in the process of construction with raise boring machines without drilling fluids. Based on the basic assumption and the aerodynamic theory, the circulation system pressure of the raise air drilling is studied, the calculation method and formula of the annular pressure drop, bit pressure drop and rod pressure drop are presented. The research results can provide theoretical guidance and technical support for the application of raise air drilling technology.
Preparation of CO2/N2 cryogenic slurry and its pipeline flow characteristics
Authors: Xin-hai ZHANG , Kai DOU , Guo-wei ZHANG , Xun-guang LI , Wang-shou CHENG , Hui ZHU
Published: January 2021

It was proposed to use CO2/N2 to effectively prevent and control Class A solid spontaneous fires such as coal. The preparation process of CO2/N2 cryogenic slurry pipeline and its pipeline flow characteristics were studied. The temperature field, pressure field and phase change characteristic changed during the transportation of the CO2/N2 mixture in the pipeline are analyzed by numerical simulation. The results showed that: the fluid in the pipeline exchanged heat and started to contact at a position of 0.1m in the pipeline. The temperature first rapidly dropped to the lowest temperature of 103K, and then the fluids in the range of 0.1m to 0.3m were fully mixed, and the temperature rised to 164K. The temperature was consistent with the equilibrium state in the pipe, and the temperature was gentle and stable; the pressure in the pipe was on the whole downward trend, and each position along the main pipe produced a positive pressure difference relative to the end of the pipe. The closer to the mixing place, the greater the corresponding pressure difference; During the mixing process, LN2 was acted as a cold source to sublime CO2 to form dry ice particles. And through the cryogenic fluid mixing experiment, the temperature distribution in the pipeline, range of the dry ice particle generation position, and the dry ice particle generation phenomenon was measured. The results showed that the mixing was completed within 0.8 m of the pipeline, and the temperature in the tube rised to 168K and remain stable. The data were basically consistent. And dry ice particles generated at the temperature of 194.5K, and a diffuse gas cloud formed at the outlet with the momentum of the jet.
Research on Nonintrusive Load Decomposition of Enterprises Based on Bidirectional LSTM
Authors: Yu Xiangqian , Li Xiaoming , Chen Jianhua , Wang Zhiguo , Zhang Shiyuan
Published: January 2021

To detect the operating condition of equipment and understand the environmental management situation of enterprises in real-time, this paper studies the non-intrusive load decomposition of enterprises based on bidirectional LSTM. In this paper, we first obtain the load characteristic parameters of different equipment in different states, and then obtain the electrical power measured from the main power meter of decontamination equipment in TOP-5 through the softmax layer of bidirectional LSTM, and then change the softmax layer to decompose the load data from the main power meter.
Study on electrochemical principle and characteristic curve of nickel hydrogen battery for mine
Authors: Ren Gaojian
Published: January 2021

As a kind of high-energy secondary battery, mining Ni MH battery is very suitable for mine backup power because of its advantages of high capacity, high power, no pollution, long cycle life, strong charging and discharging ability and high safety. This paper mainly introduces the electrochemical reaction of Ni MH battery under normal operation, overcharge and over discharge, introduces the types and components of Ni MH battery, describes the change curve of charging and discharging terminal voltage with time under different conditions, analyzes the self discharge situation of Ni MH battery under different conditions, and analyzes the cycle life and safety of Ni MH battery. The software and hardware design of battery intelligent management and SOC estimation analysis provide the basic basis.
An Intelligent Temporary While-Boring Support Technology For Raise Boring Method
Authors: CHENG Shou-ye , GAO Feng , JING Guo-ye , ZHOU Ming , HAN Bo , TANG Zheng
Published: January 2021

Ensuring the stability of the shaft structure is one of the key technologies for the application of raise boring method. In the process of reaming through rock formations with water disintegration characteristics, the impact of water gushing and drenching may induce partial collapse. To solve this problem, an intelligent temporary while-boring support technology is proposed in this paper. Firstly, the main characteristics of the technology are introduced. Utilizing the space inside the raise boring pipes, the material conveying pipes and nozzle can reach the lower part of the reamer to realize spraying support. Secondly, a composite cementitious supporting material with good mechanical properties is developed to ensure the sealing and waterproofing of the surrounding rock. Thirdly, a test study was carried out on key process parameters. The results show that the best engineering economic benefits under the condition that the rotation speed is 2r/min and the distance between the nozzle and the surrounding rock is 1m. Fourthly, an image classification algorithm based on Resnet-34 convolutional neural network is proposed, which realizes the intelligent judgment of the effect of surrounding rock support. Finally, an industrial test was carried out in Lijiahao Coal Mine. The test results show that the intelligent temporary while-boring support technology proposed in this paper has a good performance, effectively achieving the sealing and water resistance of the surrounding rock, and the shaft structure has not been damaged.
Design performance requirements and failure analysis of oxygen system on civil aircraft
Authors: Wang Jian
Published: January 2021

As an important system for maintaining the respiration and safety of people on board, the oxygen system is widely used in modern civil aircraft. This paper provides a complete overview of the system design performance requirements, starting from the basic design theory of the civil aircraft oxygen system. It also analyzes the failure causes of the oxygen system from the perspective of test flight and operation, and provides some references for the analysis of the failure of the civil aircraft oxygen system and the debugging methods.
Application of Improved Droop Control Based on Grid Impedance in Photovoltaic Grid-Connected Power Generation system
Authors: Hao Xu Hao , Fang Wang , Cheng Liang Zhi
Published: January 2021

When the power grid impedance mutates, the output power of the grid-connected photovoltaic power generation system controlled by drooping will become very unstable. To solve this problem, an improved droop control algorithm based on network impedance detection is proposed. Taking photovoltaic grid-connected power generation system as the research object, the influence of power grid impedance on traditional droop control is firstly expounded by introducing power grid impedance value into traditional droop control. Then the method of real-time network impedance extraction is introduced. Furthermore, according to the bandwidth and phase angle constraints of the equivalent output impedance phase frequency characteristics of the photovoltaic grid-connected inverter, the controller parameters are updated in real time to achieve the purpose of adaptive network impedance mutation. Finally, the proposed method is tested and verified by real-time simulation in the loop respectively. The results show that the proposed method is correct.
Simulation and Analyses of a Novel Air-conditioning Solution for Improving Energy Saving in a Data Room
Authors: Tong Li , Liang CAI , xiao zhang
Published: January 2021

In view of the feature of long airflow path, high wind resistance, and large area of refrigeration equipment in traditional data room, a new type of under-floor modular air conditioner and its corresponding new air conditioning solution for data room is proposed in this paper. The mathematical and physical model of the new solution for data room is established through a computational fluid simulation software and compared with two mainstream air conditioning solutions. Meanwhile, the impact of these three different air conditioning solutions on the temperature field, airflow field and energy consumption are analysed. The results show that the new type air conditioning solution for data room not only can be used to improve the distribution of temperature and airflow in the data room, but also can greatly reduce the energy consumption of the system.
Innovation of Intelligent Tensioning in Precast Box Girder
Authors: Zheng Jianhao , Zhang Hailong , Wang Jiawei
Published: January 2021

Because of the high precision and stability of the intelligent system, the intelligent tensioning technology can completely eliminate the interference of human factors and effectively ensure the construction quality of the prestressed tensioning. In this paper, the characteristics, principle, process flow and points for attention in the process of intelligent tensioning of precast box girder are introduced.
Research on Energy-saving Performance of Low-energy Consumption Green Buildings
Authors: Yu Wenhong , Tang Shengshi , Wang Kuan
Published: January 2021

In view of the shortcomings of the current green building evaluation system, this paper present a new evaluating index for the energy saving performance of low-energy green buildings: CEC, and this paper evaluated and analyzed the energy-saving performance of green building by using CEC index.
Coordinated Development Based Grid-Source-load Collaborative Planning Method of Uncertainty and Multi-agent Game
Authors: Lei He , Zhou Si-xuan , Wang Yin-xiang , Zheng Yun-fei , Jing Lin , Fang Reng-cun , Yang Dong-jun , Sang Zi-xia
Published: January 2021

When planning the power grid, it is necessary to obtain the optimal decision scheme according to the market behavior of different stakeholders. In this paper, the virtual game player "nature" is introduced to realize the deep integration of game theory and robust optimization, and a source network load collaborative planning method considering uncertainty and multi-agent game is proposed. Firstly, the planning decision-making models of different stakeholders of DG investment operators, power grid investment operators and power users are constructed respectively; then, the static game behavior between distributed generation (DG) investment operators and power grid investment operators is analyzed according to the transmission relationship of the three; at the same time, robust optimization is used to deal with DG. In this paper, we introduce the virtual game player "nature" to study the dynamic game behavior between the virtual game player and the power grid investment operator. On this basis, the dynamic static joint game planning model is proposed.
Research on Environmental Cost Control Methods of Coal Enterprises under the Background of Big Data
Authors: Ma Huiying
Published: January 2021

The coal industry plays a vital role in the rapid development of China's social economy. However, under the pressure of sustainable economic development, the profit margin of coal companies is relatively low. In order to increase the profitability of coal companies and maximize their economic benefits, we need to strengthen cost control. In recent years, the main research on cost control of coal enterprises includes logistics supply chain, inventory structure and value chain model optimization. These studies did not study the cost control methods of coal enterprises from the direction of environmental cost control. In the context of big data, coal companies need to accelerate their transformation and upgrading, relying on data platform systems to carry out environmental cost control in the development of coal companies. Only in this way can the sustainable development of coal enterprises be promoted.
Review of SBR process in effluent treatment
Authors: Jing YANG , Wei-li LIANG , Fu-chuan HUANG
Published: January 2021

SBR process evolved from activated sludge process. Because the long cultivation period of activated sludge process and the treatment effect can not meet the needs of production and life, SBR process and related variant improved process came into being. Since the 21st century, with the development of automatic control technology, SBR process has become a widely used technology. This paper introduces the SBR technology and the related improvement process, and puts forward suggestions for the development of SBR Technology in the field of sewage treatment.
Joint Planning of Transmission and Distribution Network Considering Wind-solar Complementarity
Authors: Yang Jie , Li Yaxin , Yang Dongjun , Zhao Hongsheng , Xu Hanping
Published: January 2021

The temporal and spatial distribution characteristics of wind power and photovoltaic output are complementary to a certain extent, which can stabilize the volatility of single new energy power generation to a certain extent and improve the ability of the grid to absorb new energy. This paper aims to study the joint planning method of power transmission and distribution network considering the complementary characteristics of wind-solar time and space. First, a wind-solar joint distribution model based on the time-varying Copula theory is established, and a wind-solar output simulation method considering the complementary characteristics of time and space is proposed. Then, taking the system investment and new energy consumption capacity as the optimization goals, and taking the system power balance, line transmission capacity, conventional generator set output and climbing capacity as constraints, the joint planning model of transmission and distribution network is established. At last, the analysis of calculation examples proves that the joint planning model of transmission and distribution network considering the complementary characteristics of wind-solar time and space can significantly improve the capacity of the grid to absorb new energy.
The characteristics of ammonia nitrogen in the Xiang River in Changsha, China
Authors: Zhang Qinghuan , Hu Wei , Huang Guoxian , Lv Zhengze , Liu Fuzhen
Published: January 2021

Changsha is a highly industrialized city in Hunan Province, China, where the water quality is of great importance to the development of economy and environment in this area. We have analyzed the characteristics of ammonia nitrogen in the Xiang River in Changsha from 2016 to 2019. The results showed that in the main stem, concentrations of ammonia nitrogen were very low and reached the third water quality level. In the six tributaries, concentrations of ammonia nitrogen have increased, especially in Longwanggang and Liuyang River, where the latter of which has a large number of industries and domestic sewage. Correlations between monthly precipitation and ammonia nitrogen concentrations were negative, besides two sites Jinjiang and Juzizhou, indicating that in most rivers, ammonia nitrogen contents had been diluted by rainfall. In general, concentrations and fluxes of ammonia nitrogen have decreased significantly during this time period, suggesting that water environment has improved greatly under the series of the clean motions by the local government.
Physiological response of Solanum nigrum to salt stress
Authors: Liao Renyan , Zhang Lan
Published: January 2021

The effects of salt stress (100, 200, 300 mmol/L) on physiological characteristics of Solanum nigrum seedlings were studied by pot experiment. The results showed that the contents of chlorophyll a, chlorophyll b, carotenoids and total chlorophyll in S. nigrum leaves showed a trend of first flattening and then increasing with the aggravation of salt stress. With the aggravation of salt stress, the net photosynthetic rate, stomatal conductance and intercellular CO2 concentration of S. nigrum decreased gradually, and reached the lowest value when the NaCl concentration was 300 mmol/L. With the increase of NaCl concentration, the SOD activity of S. nigrum leaves decreased gradually. When the concentration of NaCl was 300 mmol/L, the SOD activity of S. nigrum decreased by 53.39% (P < 0.05). The activities of POD, CAT and soluble protein in S. nigrum increased first and then decreased with the increase of NaCl concentration. When the concentration of NaCl was 100 mmol/L, the activities of POD, CAT and the content of soluble protein reached the maximum.
Is it reasonable for the same city to advocate a policy of reducing heating temperature by the same amount?
Authors: Wang Shiqian , Long Enshen , Mao Ning
Published: January 2021

Reducing heating temperature is a universally recognized energy saving measure. However, the same city has buildings completed in different years and with different functional USES at the same time. It is an important issue worth discussing whether it is reasonable for the government to advocate reducing heating temperature by the same range. Based on DOE medium-sized office building as the object, using the Beijing meteorological database system, the thermal characteristics of four envelopment structures representing different completion years, the annual heating energy saving and relative energy saving ratio when the set indoor heating temperature is reduced by the same range are studied. The results show that the worse the thermal performance of the envelope is, the greater the annual heating energy is when the heating setting temperature drops by the same extent. It indicates that the older the building is, the better heating energy saving effect and more heating cost can be achieved by advocating lowering the heating setting temperature of the same range. For the annual relative energy saving ratio, the older buildings with worse envelope structure are slightly higher, while the new buildings with better envelope structure are slightly lower, but they are similar on the whole. It is proved that the policy of reducing heating temperature by the same range in the same city is reasonable for achieving similar energy saving ratio.
Research on the Impact on the Local Economy from the Perspective of Welfare Economics by the Collusion of Grassroots Governments, Interest Groups and Bank Branches
Authors: Jijian Gu
Published: January 2021

China's economic development is disconnected, not only between local governments, but also the local and the central government. Because of the performance appraisal and the status quo of political power structure, grassroots governments and local interest groups must be closely connected, and at the same time, they also form an alliance with the local bank branches that did not belong to any of the above branches, forming a trilateral conspiratorial economic development model. This model has far-reaching and perilous impacts on local economic development.
The Impact of Dialect Diversity on the Economy of Ethnic Areas——Taking Sichuan Province as an Example
Authors: Simin Wang , Jiayuan Li , Wengjie Guo , Huilin Yang , Yang Fei
Published: January 2021

Based on the methods of literature survey, interview survey and questionnaire survey, this paper selects Xiaojin, Danba, Kangding, Luding, Puge and Butuo County as the survey sites of multi-ethnic areas in Sichuan Province. After obtaining the first-hand data and data of local dialect usage, family language habits and family economic conditions, it empirically analyzes the relationship between dialect diversity and economic income and comes to a conclusion that in the multi-ethnic areas of Sichuan Province, dialect diversity has a significant negative impact on the level of economic income. On the basis of deepening the understanding of the relevance between language and economy, this paper provides some reference for the government to carry out reasonable language planning in ethnic areas.
A Study on the Development Ability of Economic Zones Above Provincial Level in Anhui Province -Based on Principal Component Analysis
Authors: Lei Yu , Youtian Tao
Published: January 2021

This paper uses the principal component analysis method to measure the output capacity, input capacity and comprehensive development capacity of development zones in 2017, taking nine indicators reflecting the economic development capacity of 11 development zones above the provincial level in Anhui Province as the research object. The results show that the development level of 11 development zones in Anhui Province is not high on the whole, and the output capacity and comprehensive development capacity show a trend of polarization; the input capacity has three obvious levels, and the location advantage plays an important role in the development o economic zones.
Analysis on the Influential Factors of Japanese Economy
Authors: Wang Tongye
Published: January 2021

Japan is known as a highly developed capitalist country. It was the third largest economy in the world by the end of 2017 and is one of the members of G7 and G20. Thus, for academic purpose, it is worth to discuss how Japan could expand the scale of its economy in different kinds of effective ways in the past half a century.

This paper will talk about the main factors to influence the Japanese economy from post-war period to twenty-first century. The Solow-Swan model is used to target on explaining the factors that influence the long-run economic development in an economy. To present the effects that was brought by the past policies, both total GDP calculation and GDP per capita calculation are adopted as the evidence of economic success of Japan.
Analysis on the Impact of the Foreign Exchange Reserves of China on Its Macro Economy
Authors: Zhang Jiahao
Published: January 2021

China has the largest foreign exchange reserve in the world, but the high foreign exchange reserve is a double-edged sword for the country. There are two kinds of analysis for this. First, China's foreign exchange reserves have far exceeded the reasonable scale, which will cause China to pay extremely high management costs. Second, China's foreign exchange reserves are considerable, but this is the objective demand of the economy. Sufficient foreign exchange reserves can make China occupy a favorable position in international development. Based on the data on China's foreign exchange reserve, foreign debt scale and GDP from 1985 to 2019, this paper analyzes the positive and negative effects of high foreign exchange reserve on China's economic development. By analyzing the current situation of China's foreign exchange, the author gives some policy suggestions: (1) appropriately reduce foreign exchange reserves; (2) promote the reform of the exchange rate system; (3) reform the foreign exchange system
Investigation on College Students' Financial Management Behavior and Research on Guiding Strategies
Authors: Wan Zhedi
Published: January 2021

The rapid development of information technology and economy has accelerated the integration of Internet and Finance, and contributed to changes in consumers’ attitudes and behaviors toward money. In the era of Internet consumer finance, more and more college students join the Internet financial management team. As a special consumer group, they occupy an important position, and their financial management behavior is concerned by the society. In this paper, college students in Sichuan Province are investigated by random sampling, and 514 valid questionnaires are collected and analyzed to study the characteristics of college students' financial behavior and the main factors affecting their investment tendency, so as to improve the quality of college students' consumption finance and optimize their financial ecology, and finally realize the sustainable development of campus finance.
Effect of Prescription of Traditional Sports Regimen on Depression of College Students
Authors: Ling Yu , Jun-mei Xia
Published: January 2021

To explore the effect of prescription of traditional sports regimen with different amounts of exercise on improving depression and sleep quality of college students. Depression Screening Scale (PHQ-9) and Zung’s Self-rating Depression Scale (SDS) were used to screen students with mild depression, who were randomly divided into control group, experimental group 1 (moderate exercise intensity, 30min each time, 5 times a week,) and experimental group 2 (moderate exercise intensity, 60min each time, 5 times a week). The exercise prescription intervention with different exercise amount was performed for 16 weeks. Compared with before exercise, the total scores of SDS and PSQI of the two experimental groups decreased significantly after 8 weeks of intervention; after 16 weeks of intervention, the total scores of SDS and PSQI of the experimental groups were obviously different (P < 0.05) compared with 8 weeks of intervention; after 8 weeks of training cessation, the total scores of SDS and PSQI of the experimental groups were increased, but however, significant decrease in the total scores still can be seen compared with those before the experiment(P<0.05). Compared with the control group, after 8 weeks of intervention, 16 weeks of intervention and 8 weeks of training cessation, the total scores of SDS and PSQI of the two experimental groups were significantly reduced and the effect of experimental group 2 on improving PSQI score of college students was significantly better than that of experimental group 1.Traditional sports regimen intervention can improve college students’ depression and improve their sleep quality, and it can still maintain the effect after stopping training for 8 weeks; exercise intervention of 60 minutes each time, 5 times a week, has better effect on improving college students’ sleep quality than that of 30 minutes each time, 5 times a week.
Bacterial colonies detecting and counting based on enhanced CNN detection method
Authors: Liu Shousheng , Gai Zhigang , Chai Xu , Guo Fengxiang , Zhang Mei , Xu Shanshan , Wang Yibao , Hu Ding , Wang Shaoyan , Zhang Lili , Zhang Xueyu , Chen Zhigang , Sun Xiaoling , Jiang Xin
Published: January 2021

Bacterial colonies detecting and counting is tedious and time-consuming work. Fortunately CNN (convolutional neural network) detection methods are effective for target detection. The bacterial colonies are a kind of small targets, which have been a difficult problem in the field of target detection technology. This paper proposes a small target enhancement detection method based on double CNNs, which can not only improve the detection accuracy, but also maintain the detection speed similar to the general detection model. The detection method uses double CNNs. The first CNN uses SSD_MOBILENET_V1 network with both target positioning and target recognition functions. The candidate targets are screened out with a low confidence threshold, which can ensure no missing detection of small targets. The second CNN obtains candidate target regions according to the first round of detection, intercepts image sub-blocks one by one, uses the MOBILENET_V1 network to filter out targets with a higher confidence threshold, which can ensure good detection of small targets. Through the two-round enhancement detection method has been transplanted to the embedded platform NVIDIA Jetson AGX Xavier, the detection accuracy of small targets is significantly improved, and the target error detection rate and missed detection rate are reduced to less than 1%.
Application of Blockchain Technology in the Field of Medical Devices
Authors: Min Qian , Shuting Wang
Published: January 2021

In recent years, Blockchain technology has been mentioned for many times in the fields of finance, Internet and energy, and it is a distributed data ledger that is decentralized, authentic, reliable, traceable open and transparent. Blockchain is constantly figuring out how to integrate with other industries. This paper analyzes the current situation in the field of medical devices of China by combing the Annual Report on Medical Device Adverse Event Monitoring from 2013-2019, and using the compound annual average growth rate. The analysis found that this field has pain points such as lack of third-party regulation and difficulty in traceability, and then it proposed the specific application of blockchain technology in the field of medical devices to solve the problems in this field.
Untargeted Metabolomics Analysis of Serum Metabolites in Zucker Diabetic Fatty Rats
Authors: Liu Qingyuan , Quach Sze Ying
Published: January 2021

Zucker Diabtic Fatty rats is a common model used for the studies related to type 2 diabetes. Metabolomics, proven by previous studies, can be used for the prediction of phenotype. This investigation held untargeted metabolomics analysis on the serum metabolites of the Zucker Diabetic Fatty rats, intended to gain insights in the study of the pathology of type 2 diabetes. LCMS method (liquid chromatography coupled with mass spectrometry) is an analytical chemistry technique used to separate and purify complex mixtures. After identifying metabolites using MS2 library spectrum matching, this investigation used Metabo Analyst to compare fatty rats and lean rats. Lastly, by applying over representation analysis, we identified seven metabolic pathways that are important for humans, which assists in discovery of therapeutic targets and the developments of diabetes biomarkers.
Effect of high-voltage electrostatic field on cryopreservation of human epidermal melanocytes
Authors: Cai Xu , Li Pengcheng , Chen Benke , Li Qian , Tang Jintian , Zou Xianwei
Published: January 2021

The objective of this research was to evaluate the influence of high-voltage electrostatic field (HVEF) on the freezing of human epidermal melanocytes (HEM) with respect to the degree of cell deformation, survival and proliferation rate after cell resuscitation. As a result, the degree of supercooling is increased by enhancing the strength of the static electric field in the range of 15 kV/m, and the maximum supercooling degree is 7.83±0.05 °C at 15 kV/m. By contrast, the morphology of the electric field assisted freezing cell after resuscitation was significantly improved, and the best electric field strength for cryopreservation is 15 kV/m. The survival rate of human epidermal melanocytes recovered was 88.03%, which was higher than that of the control group. The proliferation rate at 24, 48 and 72 hours are 17%, 28% and 25%, respectively, which are higher than that of the control cells. These findings demonstrate that the freezing HVEF can protect the cell physiological activity, and reduce the freezing damage. Therefore, the optimal HVEF cryopreservation technology be of great significance for the research of tissue engineering in repairing wounds, infections, and promote the development of food, medicine and other fields.
Efficacy of Bifidobacterium animalis subsp. lactis BB-12 against Giardia duodenalis trophozoites: an experimental study
Authors: Yuan Fahu , Liu Yufei , Gui Qian , Huang Qiuyi , Li Qianyu , Yang Xuping , Qiu Lixin , Feng Jinmei , Shu Xiji
Published: January 2021

Giardia duodenalis, formerly known as Giardia lamblia, is an important zoonotic protozoan parasite. It mainly infects the intestines of humans, dogs, cats and domestic animals, causing diarrhea, abdominal pain, indigestion and weight loss. At present, all the clinical drugs for the treatment of Giardia have problems such as side effects and drug resistance to varying degrees, and the development of new drugs for the treatment of Giardia is still a hot issue. There is growing interest in using probiotics as an anti-intestinal parasite strategy. The present study aimed to assess the effect of supernatants of Bifidobacterium Animalis Subsp. lactis BB-12 on giardia the growth of giardia trophozoites. In this study, the Bifidobacterium animalis subsp. lactis BB-12 were cultured in BBL liquid medium, and the effects of the supernatants on the growth and adhesion of trophozoites of Giardia were observed. The results showed that the growth of Giardia flagellate was significantly inhibited by the supernatant. The influence of the supernatant on the morphology of the trophozoites was observed by microscope, and it was found that the surface of the trophozoites was uneven, the shape was atrophied, the surface cell membrane was broken to some extent, and the contents were spilt. In summary, the results of this study suggest that the fresh-cultured supernatants of the probiotic Bifidobacterium Animalis subsp. lactis BB-12 have anti-Giardia effects.