bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Regression Analysis on the Effects of Factors on Plastic Waste Production
Authors: Yang Junnan , Zhang Lingchang , Wang Weitao , Qiu Zheyong 
Published: December 2020

Abstract
Plastic is a multi-purpose material produced in large quantities. However, the non-degradability of plastic waste also brings many negative effects. In order to solve the problem of plastic production waste, we first analyze which factors have a greater impact on the production of plastic waste, and for this reason, a multiple linear regression has been established. We quantify abstract influencing factors. After that, the data is put into Statistical Product and Service Solutions (SPSS) for processing, and the influence of different factors on plastic waste is calculated. We find that the production of plastics has the greatest impact on the increase of plastic waste, while mainland policies have the greatest impact on the reduction of plastic waste. Finally, we have a sensitivity analysis on this model to analyze the impact of various factors on the output of plastic waste.
Experimental Study on Heat Dissipation Performance of Enclosed Space with Envelope Embedded Flat Heat Pipe
Authors: Song Sihong , Ruan Yu , Wang Jianli , Xu Jiafeng , Pi Changqian 
Published: December 2020

Abstract
A lot of heat source equipment must work in enclosed space for noise controlling, electromagnetic shielding or three proofings requirement, the heat dissipation is an important problem for being restricted by the enclosed space. In order to solve the heat dissipation problem, the technology scheme was proposed that quantity of heat in enclosed space is conducted out by the flat heat pipe embedding in envelope. Furthermore, the flat heat pipe was designed and fabricated, and the heat dissipation performance of enclosed space with envelope embedded flat heat pipe was studied experimentally. It was found that the convective heat transfer on evaporation fins of heat pipe is the most important section influencing the heat dissipation performance of enclosed space. The temperature in enclosed space decreases greatly with increasing the disturbance air quantity in enclosed space. The temperature difference between inside and outside increases linearly with increasing heat source intensity. It is a novel method to solve effectively the heat dissipation problem of heat source equipment in enclosed space by embedding the flat heat pipe in the envelope.
Risk Assessment Method of Coal Spontaneous Combustion Based on Catastrophe Theory
Authors: Qiu Xiaoxuan , Cao Qinggui , Wang Yunna , Liu Qing 
Published: December 2020

Abstract
Coal spontaneous combustion is one of the major threats to coal production in China. It is very important to quote scientific and effective evaluation in order to prevent coal spontaneous combustion effectively. This paper use catastrophe theory to study the risk assessment method of coal spontaneous combustion. Used analytic hierarchy process (AHP) to determine the weight of 16 indicators to establish an evaluation model which based on catastrophe theory. Analyzed the catastrophe level value of coal spontaneous combustion hazard obtained by the catastrophe theory calculation method to determine the hazard level,and put forward corresponding suggestions. Through engineering case studies, the feasibility and effectiveness of the coal spontaneous combustion risk assessment method proposed in this paper is verified.
Effects of Applying Symbex on Tea Yield, Quality and Soil Fertility
Authors: Huang Dongfeng , Li Yu , Qiu Xiaoxuan 
Published: December 2020

Abstract
Field plot experiments were conducted to study the effects of different doses of Symbex products (i.e., clear water, 50 times, 100 times, 150 times, 200 times and 250 times diluent) on tea yield, quality and soil fertility. The results showed that, compared with CK (clear water), applying different doses of Symbex diluent could increase the density of tea bud head by 2.7% ∼ 25.3%, 100 bud weight by 3.6% ∼ 21.1%, internode length by 5.3% ∼ 21.1%, increase annual fresh tea yield by 7.6% ∼ 37.9%, increase tea polyphenols by 9.4% ∼ 41.4%, amino acids by 7.1% ∼ 39.3%, soluble sugar by 9.4% ∼ 41.4%, and water extract by 7.5%∼43.9%. Results also showed that the soil organic matter, available nitrogen, available phosphorus and available potassium in the topsoil of tea garden increased by 2.4% ∼ 29.8%, 13.7% ∼ 98.1%, 26.2% ∼ 98.0% and 24.4% ∼ 102.2% respectively. Among them, T200 (Symbex 200 times diluent) and T250 (Symbex 250 times diluent) treatments had better effects on improving the morphological indexes and biochemical composition indexes of tea garden, increasing the yield of fresh tea leaves, and improving the basic available nutrient content in the topsoil of tea garden.
Role of Boundary Layer Jet in the Occurrence and Development of Warm-sector Heavy Rainfall over South China: a Case Study
Authors: Dong Fu , Zhang Ling , Chen Weidong , Li Dengxuan , Wang Jia , Zhi Xiefei 
Published: December 2020

AbstractWarm-sector heavy rainfall which occurred at the coastal area of southern China on 8 June 2015 was associated with a boundary layer jet (BLJ). The initiation and maintenance mechanism of the BLJ is further investigated based on the Weather Research and Forecasting (WRF) model simulations and reanalysis data. The results showed that the BLJ developing at night transported moisture to the coastal area of Guangxi in southern China, which lead to the instability of the atmosphere over the coastal areas of Guangxi. The terrain blocking and lifting the southerly with abundance of water vapor is the major trigger mechanism in present case. As the BLJ weakened and vanished after midday, the amount of rainfall decreased correspondingly. Based on the numerical model sensitivity test with different parameterization schemes, the key role of the BLJ for the occurrence and development of the warm-sector heavy rainfall is further verified.
Research and Development of Full Energy Efficiency Grade Motor
Authors: Su Hui , Wen Hui , Zheng Xinhua , Tang Xueqin , Su Jianxin 
Published: December 2020

Abstract
This paper proposes the concept of “full energy efficiency grade motor”, explains the characteristics of the full energy efficiency grade motor, and introduces in detail the main techniques and design methods for realizing the full energy efficiency grade motor, and gives a set of design data and test results. The test results show that the designed motor spans three power grades and energy efficiency grades, and its technical parameters fully meet the national standards of each energy efficiency level. This technology can improve motor efficiency, reduce size, reduce tooling and mould, and simplify production management. It can solve the problem of high efficiency and energy saving of the motor in a wide range of variable conditions.
A Novel Method for Power Quality Disturbance Detection Based on LSTM Network Model Residuals
Authors: Wang Xuechun , Duan Chendong , Dai Jie 
Published: December 2020

Abstract
In order to accurately detect the time when the disturbance of power quality (PQ) occurs and the variation of voltage amplitude, a novel method of power quality disturbance detection that is based on the residual of the long short-term memory (LSTM) network model is proposed. Firstly, an offline model is developed based on historical voltage signals from a power grid under the normal condition by using the LSTM theory. Then, in order to detect PQ events online, the grid voltage signal is taken as the input of the model to obtain the residual component between the input signal and the normal signal. Finally, the amplitude change of the residual component reflects the amplitude change of the voltage. The starting and ending time and duration of the disturbance are located by detecting the mutation points of the residual component. Experiments on simulation data and engineering data show that the proposed method can well reflect the amplitude change when the voltage is disturbed, and the disturbance positioning accuracy is high.
A Fast-Dynamic Response Control Strategy for Power Supply Unit of SAR Satellites
Authors: Zhang Xiaofeng , Li Haijin , Li Jiannong , Zang Jie , Gu Yu , Zhang Donglai 
Published: December 2020

Abstract
For the power supply of spacecraft, the dynamic response is a key requirement for converters. Especially for power supplies of SAR or other pulse power supplies, the transient of load is fast and the output current is high, it is very difficult to guarantee the output voltage in the required range. The ECSS-E_ST-20C has provided a standard for the power quality of power supply for spacecraft. In this paper, a fast-dynamic response control strategy for buck converters is proposed. The proposed strategy does not increase the output capacitance, and increases the dynamic response of the converter. In the proposed strategy, the linear control and non-linear control are combined. The linear control operates in the steady state, while the non-linear control operates in the transit state. Finally, the proposed strategy is verified by simulations and experiments.
Single Rotary Valve Engine Design
Authors: Deng Baoqing , Deng Zhenyu , Gao Yuezhen , Liang Dingkai , Deng Mengqi 
Published: December 2020

Abstract
This paper presents a new type of rotary valve engine, and discusses the basic mechanism and working principle of the machine. We design the combustion chamber structure and the cooling lubrication mode, calculate the compression ratio of the machine, design the gas distribution phase, and analyze the ventilation passing ability. It is summarized that the machine has the advantages of simple structure, few parts and strong ventilation capacity.
Research and Analysis on Cold Start of Fuel Cell Bus in Low Temperature Environment
Authors: Wei Changhe , Wang Chao , Li Dan , Wei Wenbo , Zhou Hui 
Published: December 2020

Abstract
Based on the characteristics of the components of the fuel cell bus, and on the premise of satisfying the best matching of fuel cell system, power cell system, driving system and transmission system, the purging control strategy of fuel cell system is designed. Taking the fuel cell system as the control variable, the conditions of the cold start heating energy source switching and the target temperature of the fuel cell system starting are determined by the total energy demand and the power cell energy. The integrated thermal management system and the purging control strategy of the fuel cell system proposed in this paper can meet the needs of the fast start of the fuel cell bus at -30°C. Through the energy compensation in the low temperature environment, the scheme can provide the heating energy needed for the start-up of the fuel cell system in time and meet the requirements of constant heating power of the fuel cell. The experimental results show that the output power of the fuel cell is from 42% to 75% of the rated power, and the waste heat utilization accounts for 32% - 100% of the total power.
Simulation Analysis of Vibration and Noise Characteristics of High Voltage Shunt Reactor Based on Multi-physical Field Coupling
Authors: Huang Qinqing , Zhang Jing , Fan Songhai , Zhang Zongxi , Luo Chuanxian 
Published: December 2020

Abstract
In order to study the vibration characteristics of the high-voltage shunt reactor, a finite element model of the single-phase reactor was established based on the analysis of the vibration mechanism of the reactor body, by using COMSOL multi-physical field coupling simulation software. The magnetic flux density distribution of reactor core, windings, stress distribution and vibration displacement of iron core were analysed by simulation. The sound pressure distribution of the iron core was analysed based on the pressure sound field model. The results indicate that the magnetostrictive effect of the iron core reactor, the electromagnetic attraction between the iron core cakes and the ampere force on the winding are the main factors for its vibration. In addition, the reactor vibration to be mainly concentrated at the core air gap. The results obtained by multi-physics simulation are basically consistent with the measured data, which verifies the effectiveness of the simulation method. The conclusions can provide theoretical basis for the analysis and monitoring of reactor vibration and noise.
Establishing an Intelligent Laundry Drying Rack Using System Innovation Theory
Authors: Lin Ying-Hsiang , Lee Yin-Ching , Chang Chia-Pao 
Published: December 2020

Abstract
Laundry drying is a daily chore that every family endures. In Taiwan it is worse as the available area is limited, urban areas are densely populated, the winters are wet, and thunderstorms often occur on summer afternoons. Improving on the traditional laundry drying rack could make it an indispensable part of modern life improving the quality of life for everyone. This study uses TRIZ to improve the traditional bamboo design. First, this study collects and analyses literature related to the traditional bamboo design. Second, it then utilizes a contradiction matrix, 39 engineering parameters, and 40 invention principles in TRIZ to find the places that need to be improved and subsequently improves them. Finally, an intelligent laundry drying rack was created using sensors to detect light and rain. These synchronously trigger the control circuit, and drive the motor, so that the laundry is smoothly moved inside from outside, making laundry drying more convenient and safer.
Research on Fault Location in Distribution Network Based on Fast Fault Transfer Arc Extinguishing Device
Authors: Xinyu Zhang , Yu Nie , Yanan Wang , Dan Zhao , Wei Du , Zimo Zheng 
Published: December 2020

Abstract
In the distribution network equipped with fast fault transfer arc extinguishing device, after a single-phase grounding fault occurs, the fault phase bus is quickly grounded to realize arc extinguishing. At the same time, the traveling wave signal generated during the grounding process of the fault phase bus can realize fault location. The traveling wave signal is subjected to phase-mode transformation, and the time difference of the zero-mode component mutation detected twice at the exit of the fault line is to be recorded. This time difference is the time which it takes for the zero-mode component to go to and fro once between the bus and the fault point. And then the fault distance can be calculated based on it. The integration of arc extinguishing and fault location is realized. The AT P simulation software is used to realize the fault simulation of distribution network. And the accuracy and feasibility of the proposed fault location method are verified.
Single-phase-to-ground fault model analysis of arc suppression coil grounding system in distribution network
Authors: Xinyu Zhang , Yu Nie , Chuanzong Zhao , Wei Du , Yanan Wang , Zimo ZHENG 
Published: December 2020

Abstract
Start your abstract here…The short-circuit fault type of China’s medium-voltage distribution network is 80% single-phase ground fault. Since the non-effective grounding system can continue to operate for 1∼2 hours after single-phase-to-ground fault, the analysis of the single-phase-to-ground fault model is very necessary for the arc-suppression coil grounding mode in distribution network. In this paper, by establishing a single-phase ground fault model of the distribution network with arc-suppression coil grounding method, it is theoretically analysed that is the different transition resistances in metallic grounding, high-resistance grounding and intermediate state, and use ATP/EMTP simulation to analyse the fault occurrence, the change and difference of the current waveform on the fault line and the normal line as well as the arc suppression coil. It is concluded that when the single-phase ground fault occurs in the distribution network under the grounding mode of the arc suppression coil, no matter how the transition resistance changes, the current direction of the fault line and the normal line (when the predetermined reference direction is the bus flowing to lines) is reversed, but the difference between the fault current and the normal current is weakened with the change of the transition resistance, so different faults models should be used for different grounding resistances to analyse the transient currents of normal and fault lines on the zero sequence circuit model.
Testing the decoupling theorem with IBM quantum computer
Authors: Li Xinying 
Published: December 2020

Abstract
Decoupling is a well-studied phenomenon in the theory of quantum information: the correlation between two systems - possibly in the form of entanglement - disappears almost entirely when one undergoes a random unitary evolution. Previous studies have proven the mathematical formulas and general conditions for decoupling two systems. The aim of this work is to observe the effectiveness of a real-world implementation of the decoupling scheme with the IBM quantum computer. In particular, we apply Clifford circuits to the systems in initial state and observe how correlation varies with respect to different circuit lengths. A significant trend was discovered, according to the mathematical theorems: the correlation between the systems decreases as the size of Clifford circuit increases. This observation shows that the decoupling theorem can be implemented effectively with the IBM quantum computer. Under a global perspective, this work is intended to provide a result in support of the fundamental task of laying the groundwork for the development of a reliable quantum computing architecture.
Review on land management and ecological natural restoration evaluation
Authors: Hao DONG , Yi ZHANG , Zhongwu LI , Chao JIANG , Jiaze LI , Liting WANG 
Published: December 2020

Abstract
Many lands will be destroyed due to construction, development and utilization, thus losing the function of Ecological Environment Service. In 2019, the state put forward the strategy of ecological civilization and green development, the idea of Life Community of mountains, rivers, forests, forests, fields, lakes and grasses, etc.. This paper first introduces the foreign experience of land renovation and ecological natural restoration, and puts forward the evaluation angle of land renovation and ecological natural restoration. From the key issues of governance and rehabilitation, such as the prerequisite elements, cost-benefit analysis, value judgment and adaptability principle, we draw lessons from foreign research cases, constructing the path and strategy of land renovation and ecological natural restoration suited to China’s national conditions. The research provides the feasible measurement standard and the scientific basis for the enterprise and the government.
Analysis of the influence of vertical sound field distribution on acoustic testing in shallow sea environment
Authors: Wang Xiaofeng , Meng Zhaoran , Liu Bo 
Published: December 2020

Abstract
The vertical sound field distribution in shallow seas is similar to the standing wave field, and the single-frequency sound source will have antinodes and nodes in the vertical direction. Therefore, the acoustic test system will have a greater impact on the test results when the acoustic test system is placed at different depths. In this paper, the fast field method is used to solve the spatial sound field distribution of the single-frequency line spectrum and the one-third octave broadband spectrum. The calculation results of the sound source fixed depth receiving point at a certain depth are given, and the different sound velocity gradients and acoustics are analyzed. The impact of the test system receiving depth changes on the sound field strength has certain engineering guiding significance for the actual underwater acoustic test.
Investigation on the influence of thermophysical properties of working fluid on heat extraction from hot dry rock
Authors: Wang Yuanming , Zhang Jinxu , Liu Xueling , Wang Jiansheng 
Published: December 2020

Abstract
High pressure hydraulic fracturing is a safe and environment-friendly method for the utilization of hot dry rock. In present work, the heat transfer characteristics of water and helium in hot dry rock are probed with numerical simulation. The results show that reducing the injection temperature, increasing the pressure difference between the injection well and producing well, can increase the heat extraction rate and the total heat extraction. Furthermore, under the condition of same pressure difference and injection temperature, the heat extraction rate of helium is greater than that of water, which indicates that helium is more suitable for hot dry rock heat extraction.
Effect of Local Radiant Heating on Thermal Comfort in Cold Environment
Authors: Yanyan Huang , Ping Jiang 
Published: December 2020

Abstract
In cold environment, local radiant heating can improve thermal comfort. In this paper, the local radiant heating equipment was used to heat subjects’ ankles and backs separately at an ambient temperature of 12.5°C and 14.5°C, with the radiant power of 200W, 300W and 500W. The number of subjects was 20.The subjects’ thermal comfort changes were collected through a subjective questionnaire. The results show that local radiant heating can improve human thermal comfort. The effect of radiant heat source located on the back of human body is better than that on ankle. Local radiant heating in cold environment has energy saving effect.
Vegetation of the summit of the natural monument “Mount Beshtau” (Stavropol Krai, Russia)
Authors: Dutova Z V 
Published: December 2020

Abstract
The characteristics of steppe meadows with subalpine elements of the top of the natural monument “Mount Beshtau” are given with a list of measures for their protection. The Mount Beshtau is the highest of the laccolithic mountains of the Caucasian Mineral Waters (the Central Caucasus). The mountain broad-leaved forests, meadow steppes, steppes and steppe meadows with subalpine elements, characterized by a pronounced altitudinal zonation, are the main types of vegetation in the region. Five vegetation formations were identified on the top of the mountain, based on the ecological-phytocenotic approach. Calamagrosteta arundinaceae and Brachypodieta pinnati formations were considered to belong to steppe meadows with subalpine elements. These plant communities require a compliance with nature conservation measures determined by the status of a natural monument, and this may be named as an ultimate condition for their conservation. In this regard, it seems necessary to increase the environmental awareness, as well as to ban totally the access with quad bikes and uncontrolled visiting the top of the mountain.
Manifestation of altitudinal differentiation of climatopes and phytocoenoses on the slopes of the Maly Yamantau Ridge (South Ural Nature Reserve, Russia)
Authors: Gorichev Yu P 
Published: December 2020

Abstract
The altitudinal variability in the vegetation structure was studied for the Maly Yamantau Ridge (Ural Mountains, Russia). Previously, a number of original assumptions regarding the peculiarities of the altitudinal differentiation of forest formations in the region of deciduous-dark coniferous forests of the Southern Urals have been made, and a generalized scheme of altitudinal differentiation of climatopes and forest formations in this area has been presented. The study aims to search for the ways of manifestation of general patterns of altitudinal differentiation of forest formations on a particular mountain range. The Maly Yamantau Ridge was considered as a model area, since its vegetation has been studied in detail. A network of sample sites, serving as the markers of climatopes, was set in primary and secondary phytocoenoses. In general, the primary broadleaf and dark coniferous phytocoenoses may serve as the reliable markers of altitudinal belts and their climatopes. Secondary phytocoenoses blur the manifestation of altitudinal differentiation of the climatopes. The altitudinal ranges occupied by climatopes on the slopes of the Maly Yamantau Ridge have been defined. The altitude spectrum of climatopes and forest formations is pronounced much on the western slope of the ridge; on the southern slope, it is not expressed.