bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Influence of the use of energy on living condition
Authors: Chen Yang
Published: February 2021

Based on the important influence of the use of energy on environmental pollution, the evaluation index of the use of energy and living condition is selected, and the principal component analysis is used to measure the use of energy level and living condition degree in each region. The panel data of 30 provinces in China from 2011 to 2017 were selected to build a regression model to study the relationship between the use of energy and regional environmental pollution. The results show that the influences of different variables on living condition are different, the influences of the use of energy and population factors on living condition are positive, and the influences of scientific and technological water level on living condition are negative. On this basis, some countermeasures and suggestions are put forward to optimize the the use of energy structure, expand the scale of environmental governance investment, and give play to the leading role of the government.
Underground Intelligent Dry Dust Collector in the Coal Mine
Authors: Xu Jian , Wang Haiyang
Published: February 2021

Aiming at the problems of low dust removal efficiency, poor removal of respiratory dust, and serious waste of water resource, caused by underground wet dust removal device in heading face in the coal mine, and the promotion of coal mine mechanization, informatization, automation, and intelligent construction, we make the development of an intelligent dry dust collector working underground. We adopt new production process to develop the flame-retardant anti-static dust removal filter material without rolling points, which can increase the effective dust removal filter area by more than 20%, greatly reduce the size of the dust collector, and have a total dust removal efficiency of more than 99.5%. We apply automatic intelligent control technology to realize linkage with heading machine, automatic start and stop, intelligent cleaning, fault detection and alarm, and unmanned operation, and to support multiple terminal equipment access, so as to provide complete set of dry dust removal technical support for unmanned dig working face.
Optimal configuration of distributed generation based on sparrow search algorithm
Authors: Wang Hairui , Xianyu Jianchuan
Published: February 2021

Aiming at the problem of how to effectively configure distributed generation (DG) in the distribution network, an optimization configuration model of DG with the lowest total system operating cost as the objective function, system power flow, node voltage, branch current and distributed power capacity as constraints is established. In this paper, a new technique based on the sparrow search algorithm (SSA), is used to solve the optimal configuration model of DG for the first time. Finally, the IEEE 33 distribution system is used as an example to perform simulation, which verifies the rationality of the optimal configuration model and the effectiveness and superiority of the SSA, which can more efficiently solve the problem about optimal configuration of DG.
Study on the influence of flat plates for stiffening on the force transmission of frame cross bracing
Authors: Mei Dafang , Li Ming
Published: February 2021

The main girders of the I-section steel-concrete composite twin girder bridge is usually connected together by frame cross bracing. When the cross girder is connected with the main girders by welding, the flat plates for stiffening can be used to strengthen the connection to ensure the effective transfer of connection forces between the two. In this paper, the finite element simulation method is used to study the influence of flat plates. The results show that, compared with the twin girder structure without flat plates for stiffening, when the same load acts on the cross girder: the stress peak value of the cross girder of the twin girder structure with flat plates is obviously reduced, and the stress peak value of the main girders is increased; the bending stress of the web of T-shaped connection stiffeners diffuses faster from the welding part to the end; the peak value of the axial stress on the web of T-shaped connection stiffeners decreases obviously, and the position of the peak value changes from the side near the cross girder to the side near the web of main girder. The above results show that it is necessary to set the flat plates for stiffening in the twin girder bridge to ensure the transfer of forces between the main girders and cross girder.
A calculation method of precise direct normal irradiance based on measured CSR
Authors: Niu Yisen , Wu Zhaoxuan , Zhang Kexin , Song Jifeng
Published: February 2021

Radiation from the circumsolar region called circumsolar radiation is part of direct solar radiation, but not all circumsolar radiation can be received by concentrating solar power (CSP). Circumsolar ratio (CSR) reflects the proportion of circumsolar normal irradiance in direct normal irradiance (DNI). CSR is related to the radial distribution of solar brightness (sunshape) and it is influenced by atmospheric turbidity and air mass (AM).Performance of CSP is affected by CSR, which should be considered in the CSP simulation and analysis. This work introduces a method of measuring CSR with a CCD camera and filters. Also a calculation method of DNI for different field of view based on the measured CSR is proposed.
Study on Effect of High Voltage Pulse Electrode Spacing on Broken Concrete Physical Performance
Authors: Yan Zhang , Yin Yushi
Published: February 2021

In order to study on effect of high voltage pulse electrode spacing on broken concrete physical performance, through four electrode spacing in the concrete crush test, analysis of electrode spacing effect on water absorption and loss rate of aggregate, particle size distribution, crushing value and surface roughness. The test results show that after concrete crushed by the pulse, crushed aggregate mainly assumes three kinds of apparent form; With the electrode spacing increasing, concrete crushing grain group present diversity, continuous graded aggregate gradually formed; The water absorption rate of large particle size assumes the albeit slowly trend compared the small one, on the whole, within 1 hour, aggregate absorbent ability quickly reach the maximum, grain group for 5-20 mm and 16-31.5 mm compare 0.16 hours increased by 25.53% and 12.86% respectively, to 24 hours, only increased by 18.82% and 3.02% compared the early time(one hour)condition respectively; For water loss, large and small particle size both show the increase trend; The aggregate particle size mass within the scope shows the tendency of increase after the first reduce overall.
Enhancement of impact resistance of CVD diamond coating by multilayer strategy
Authors: Zhou Fan , Chen Naichao , Chen Shuai , Wei Kun , He Ping , Liu Dongmei , Ju Fasong
Published: February 2021

Poor impact resistance of diamond coating has limited its wide application. In this work, a experimental analysis was conducted to explore the effect of multilayer strategy on impact behaviour of diamond coating. Multilayer diamond coating facilitated the enhancement of impact resistance. Thereafter, four types of chemical vapor deposition coating were deposited to further verify the impact resistance of multilayer diamond coating. Scanning electron microscopy, Raman spectrometer and X-ray diffraction equipment were used to characterize the diamond coatings before and after the impact, respectively. The results showed that MCD/NCD coating had the smallest impact scar. Furthermore, it could be concluded that the multilayer strategy was beneficial for coating to improve the impact resistance.
Test research on mechanical properties of engineered cementitious composites
Authors: Wang Shuaiyu , Du Hongxiu , Lv Jingjing , Guo Jun , Yue Guoyang , Ma Jie
Published: February 2021

Taking engineered cementitious composites(ECC) as the research object, the effects of sand particle size(A), total fiber volume content(B) and fiber types(C)(single, double or triple blending)on the flexural strength, compressive strength and tensile strength of ECC were studied by orthogonal test. The results show that the total fiber volume content has the greatest influence on the three mechanical properties of ECC, and the three mechanical properties are improved with the increase of total fiber volume content. Followed by the influence of fiber types, the flexural and compressive strength of single doped PVA is higher than single doped PP and the two mixed, steel fiber can improve the flexural and tensile strength. The influence of sand particle size on the three mechanical properties of ECC is the least. After comprehensive consideration, in the range considered in this study, the optimal scheme is 600 μm grain size, 2% fiber volume content and triple blending(PP0.5%+PVA1%+S0.5%).
Simulation research on microscopic remaining oil distribution in high water cut oilfield
Authors: Pan Shaowei , Wang Zhaoyang , Luo Haining
Published: February 2021

Most of the oilfields in China have entered the stage of high water cut nowadays, and it is very difficult to enhance oil recovery in these oilfields. In this paper, combined with the image processing technology, the visualization technology of 3D data field and the seepage mechanics theory, a simulation model on microscopic remaining oil distribution has been constructed. After that, the remaining oil distribution of a high water cut oilfield in south China in three different microscopic pore throat networks, namely big pore and coarse throat, medium pore and medium throat and small pore and fine throat, was simulated. Through the simulation results, the conclusions are drawn: compared with the small pore and fine throat network, the development resistance of oil in the big pore and coarse throat network and the medium pore and medium throat network is smaller under the same water-flooding development conditions; compared with the big pore and coarse throat network, the development resistance of oil in the medium pore and medium throat network is larger, which leads to more remaining oil left. The simulation on microscopic remaining oil distribution is of great significance for enhancing oil recovery in high water cut oilfields of China.
Study on aerobic corrosion characteristics of gas injection pipe wall in oil field under dry / wet interaction condition
Authors: Cheng T. , Dang Y.B. , Hu F.T. , Jia Z.W. , Niu Z. , Hu B. , Zhang H.L.
Published: February 2021

By studying the corrosion behavior of oilfield pipelines in different oxygen content and corrosive medium under simulated ambient air/air foam flooding environment, the dry/wet interaction between the surface and the interface of the service casing is caused by the air displacement/air foam flooding, which greatly aggravates the aerobic corrosion process. The corrosion process changed from localized corrosion to uniform corrosion with the increase in dry and wet cycles. Pitting corrosion occurs in the early stages of dry and wet cycles, and the increase in chloride concentration and oxygen content will accelerate the initiation and development of pitting.
The change characteristics of dissolved copper in water of the Hun River, China
Authors: Zhang Kan , Li Haifu , Lan Tianhui , Su Fangli
Published: February 2021

The concentrations of dissolved copper in water of the Hun River were investigated to research the change characteristics of dissolved copper. We established the dynamic concentration function about time and spatial coordinate and convection diffusion equation of dissolved copper to obtain the distribution and accumulation characteristics of dissolved copper in the Hun River. In addition, we analyzed the advantages and disadvantages of two types of concentration functions of dissolved copper and used their own advantages to research the distribution and accumulation characteristics of dissolved copper in the Hun River. The results revealed the sources of copper pollution in water of the Hun River and provided theory basis to control copper pollution along the Hun River basin.
The compilation of material consumption quota of coal enterprises based on operation
Authors: Jia Shun , Wang Haiyang , Cao Cheng
Published: February 2021

In the entire production and processing process of coal products, material consumption accounts for the largest part of the cost. For the management of material cost, the process of preparing the cost budget based on the job is the process of setting the rated price. The preparation of job-based material consumption quotas is to reflect the occupation and consumption of materials in the job process to the amount and value of the job. Traditional coal enterprise material consumption budgeting is based on material consumption in the production process as the starting point for budgeting, without considering the real motivation of material consumption. This paper studies the distribution of the number of picks consumed by the two fully mechanized mining teams under the same working face to form a operation quota.
Study on the synthesis of modified materials and their adsorption performance on heavy metal ions from aqueous solution
Authors: Zeng Jian , Chen Yaozong , Chen Fang , Liu Mengfei , Gan Min , Zhu Jianyu
Published: February 2021

In this work, the schwertmannite modified by different divalent cations were successfully prepared and used for the adsorption of Cr(VI) and Cu(II) from aqueous solutions. The characterization was measured by scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier Transform infrared spectroscopy (FTIR). FTIR results show that the doping of Mg2+ and Mn2+ significantly increased the content of hydroxyl group. Moreover, the adsorption kinetic study illustrated that chemisorption mainly controlled the Cr(VI) and Cu(II) removal process. Therefore, schwertmannite modified by doping with divalent cations could be a potential adsorbent for the remediation of Cr(VI) and Cu(II) containing wastewater.
Research on performance of mine dehumidification and cooling system based on heat pump
Authors: Guo Zhenxing , Miao Dejun , Kong Lingxiao
Published: February 2021

A heat pump-based mine solution dehumidification and cooling system is used in deep mines, which can not only reduce the temperature and humidity of the working face, but also recycle the low-grade heat energy and improve the utilization rate of energy.Under the condition of long distance air supply, within the range of 10m from the heading face, the equivalent temperature of the air can fall to 24.7 °C, the cooling range is 5.6 °C, and the relative humidity decreases by 23.79%. Compared with the original cooling system, the COP value of the system can reach 3.43 under the same working conditions, 19% higher than the original cooling equipment.
Numerical Study on Heating Process of High Viscosity Crude Oil in Oil Tank of Sunken Ship
Authors: Shuai Yang , Wen-feng Wu , Jia Liu , Yong-yan Chen , Xu-xiu Wang
Published: February 2021

This article assumes that the crude oil in the oil tank of the sunken ship is completely solidified, has high viscosity, and loses fluidity before heating. Based on ANSYS software, a three-dimensional numerical model of the sunken oil tank was constructed, and the numerical study of the heating process of high-viscosity crude oil in the sunken oil tank was carried out. According to the theory of heat transfer, the changes in the solid-liquid interface and the flow characteristics of the oil during the heating process of high-viscosity crude oil are analyzed to obtain the heat transfer characteristics during the heating process. Studies have shown that the heat transfer method at the initial stage of heating is mainly heat conduction, as the highly viscous crude oil continues to melt, the influence of natural convection gradually strengthens. This research can provide relevant theoretical basis for the underwater oil pumping work of salvaging sunken ships.
Study on the Preparation of Novel Fe-Mn Composite and its Performance on Chromium (VI) Removal from Aqueous Solution
Authors: Chen Yaozong , Gan Min , He Peng , Zhu Jianyu
Published: February 2021

In this work, a novel Fe-Mn composite (PR) was prepared and used to efficient remove Cr(VI) from aqueous solution. SEM analysis shows the obvious surface structure change after Cr(VI) treatment. The PR composite has a wide pH range of application. Moreover, the pseudo-second-order model and Langmuir isotherm model described well with the experimental data. The maximum adsorption capacity was 36.64 mg/g (pH = 6, 30 °C). Both humic acids and ionic strength did not have significant effect on Cr(VI) removal by PR composite. Therefore, PR composite could be a potential adsorbent for the remediation of Cr(VI) containing wastewater.
Study on the Removal Efficiency of Pollutants by Electrochemical Oxidation
Authors: Geng Yan , Yan Tingchun , Wang Manning , Huang Yaqi , Liu Guodong , Quan Yue
Published: February 2021

In this study, magnetic field and electrochemistry were combined to treat Rhodamine B (RB) wastewater. This paper discussed the influence of electrolysis time, voltage, electrolyte type, electrolyte concentration and electrode material on the decolorization rate of RB. Under the optimum condition (100.0 mg/L concentration, electrode distance 3.0 cm, magnetic field intensity 20.0 mT, voltage 7.0 V, titanium as anode material, 0.1 mol/L KCl electrolyte), the decolorization rate reached 99.32% after 40 min.
Decision Analysis of Spent Power Battery Recovery Mode under Hybrid Dual-Channel Collection
Authors: Liang Xuedong , Yao Bangyi , Ye Meng , Wang Yaqi , Li Ziyang
Published: February 2021

Recycling spent power battery is an important measure to alleviate energy shortage and environmental pollution. However, at present, there is no uniform standard for the recycling channels of spent power battery, and the construction of recycling channels of various recycling subjects is chaotic, and the mode with the highest efficiency is still inconclusive. Therefore, based on the current situation of spent power battery recycling, combined with the closed-loop supply chain channel decision-making theory, this paper studies three hybrid dual-channel recycling modes, compares and analyses the recycling rate and profit under different modes, and finally discusses the influence of different factors and recycling modes through numerical analysis. The results show that: (1) The hybrid dual-channel recycling mode of automobile alliance and third-party recycler can bring the maximum recovery rate and profit. (2) The competition between different recycling channels can not only improve the recovery rate, but will lead to the decline of the recovery rate and profit, resulting in a double loss situation. (3) Centralized decision-making brought about by cooperation can improve the total recovery rate and the total channel profit.
Potentiometric Titration Analysis of Triethylamine and Xylidine Based on Smooth Derivation of Savitzky-Golay
Authors: Jie Liu , Zhulin Yu , Wei Li
Published: February 2021

The titration curve is not obvious during the potentiometric titration analysis of the sample containing xylidine, and there is interference noise. The Savitzky-Golay smoothing method is used to eliminate the local noise effect in the titration curve, and the first-order derivation curve is obtained. The method performs polynomial fitting and derivation on each data point in the titration curve by aliquoting the moving window, and obtains the most effective information while eliminating noise. According to the standard sample measurement result error optimization window width and polynomial fitting times, the titration curve is smoothed by five points to obtain the ideal measurement result. The analysis of the actual sample shows that the smooth derivation method can more accurately detect the titration end point of the titration curve, and is simpler, faster and more reliable than the mapping method.
Study on Gas Occurrence Law in Xigou Coal Mine
Authors: Li Chengyu , Zhang Lili
Published: February 2021

The factors affecting the gas content occurrence and accumulation are quite complicated, in this paper, the gas occurrence law of Xigou Coal Mine is studied from the aspects of coal seam metamorphism, coal seam thickness, geological structure, surrounding rock lithology, burial depth and hydrogeological conditions, it provides guidance for safety production and gas development and utilization in later period.
Oil shale in situ conversion with catalyzing by mineral-based solid acids
Authors: Meng Xianglong , Qi Zhilei , Yu Cong , Song Ranran , Bian Junjie , Ma Zhongliang , Long Qiulian , Su Jianzheng
Published: February 2021

This study aims to explore the effect of mineral-based solid acids catalyst on oil recovery from oil shale. Kaolin/SBA-15 and clin/SBA-15 catalysts were prepared from kaolin and clinoptilolite, respectively, and used for in-situ catalytic conversion of oil shale and hydrocarbon generation transformation of kerogen. Carbon number and boiling range analysis were performed on the catalytic conversion products of oil shale under the condition of 300 °C. GC/MS analysis showed that the main products of catalytic conversion were alkanes and cycloalkanes, ranging from 6 to 10 carbons in length. The boiling range was more distributed between 170 °C and 250 °C, and no reduced pressure gas oil and residue oil with boiling range above 350 °C appeared. The product analysis and element analysis of the oil shale catalytic conversion show that the conversion effect of kaolin/SBA-15 and clin/SBA-15 with and without catalyst is not different. In the process of kerogen hydrocarbon generation transformation, the carbon number is distributed between 9 and 15 carbons. After the addition of kaolin/SBA-15 and clin/SBA-15 catalysts, the content of C5-C11increased by 14.85% and 11.66%, respectively; the content of C12-C20decreased by 14.85% and 11.66%, and the selectivity of C9increased to 50.47% and 42.66%, respectively. The boiling range was concentrated between 70 °C -250 °C, and the contents of naphtha in the transformed products after adding catalyst were 54.99% and 34.76%, respectively, and the contents of the middle distillate were 34.33% and 30.62%, respectively. Kaolin was the abundant mineral in the shale. It provided a feasible approach for in situ preparation of kaolin/SBA-15 catalyst underground.
Research on key techniques of tissue culture of Qinghai Rhubarb
Authors: Zhang Xiaohui , Shi Binli , Qiu Jiang
Published: February 2021

Rheum palmatum L. is a perennial herb of the Rheum genus Polygonaceae. It is a traditional Chinese herbal medicine which has extremely high medicinal value. Rhubarb has scarce seeds in subtropical regions, and natural planting conditions have limitations. In recent years, the demand of rhubarb has increased, and the means of sowing and raising seedlings can no longer meet the needs of the market. Traditional sowing and propagation methods have limitations such as long cycle and low reproduction coefficient. Tissue culture technology can shorten the reproduction cycle that increase the reproduction coefficient and maintain the excellent characteristics of the parents, which is an effective way to promote the large-scale and commercial production of fine varieties of rhubarb. The results of the study showed that: (1) Analysis of the characteristics of Qinghai Rhubarb seeds. (2) Seed sterilization treatment. (3) Primary culture medium selection. (4) Callus induction. (5) Callus proliferation culture. (6) Hypocotyl callus bud differentiation.(7)Rooting culture. (8) Qinghai Rhubarb tissue culture seedling transplantation. Using the method of the present invention to establish a Qinghai Rhubarb in vitro culture aseptic propagation system, high-quality Qinghai Rhubarb seeds as explants and different hormone medium ratios, Qinghai Rhubarb hypocotyl induction rate reached 90%, and the proliferation coefficient reached 4.3. The survival rate of transplanting tissue cultured seedlings reaches 95% which can improve the reproduction efficiency of Qinghai Rhubarb, and provide theoretical basis and technical support for subsequent research on transgenic and genetic improvement. It can also provide a basis for medicinal value for the systematic research and commercial production of Qinghai Rhubarb.
Design of Optimal Scheme for Industrial Network Monitoring of Ocean Energy Power Generation System
Authors: Kang Wang , Xiwu Gong
Published: February 2021

In recent years, with the development of ocean energy power generation technology, the monitoring technology of ocean energy distributed micro-grid power generation system is also advancing with the times. This paper proposes an optimization solution for the industrial network monitoring of the ocean energy power generation system composed of HMI, PLCs, distributed I/O, etc., in order to better adapt to the complex and changeable harsh environment of ocean energy power plant, provide real-time and accurate data for subsequent fault diagnosis of the power generation system. It mainly realizes the functions of microgrid system status detection, fault alarm, and real-time display of electrical parameters of the system during power generation. The test simulation results show that the design realizes the intelligent monitoring of real-time parameters of the power generation process.
Mixed Game Theory Based Coordinated Development and Planning of Wind Power, Thermal Power and Grid
Authors: Zheng Yun-fei , Wang Yin-xiang , Jing Lin , Lei He , Yang Dong-jun , Fang Reng-cun , Zhou Si-xuan , Sang Zi-xia
Published: February 2021

In order to reduce the investment waste caused by independent planning of wind power, thermal power and power grid in high penetration wind power system, and promote wind power consumption, a new hybrid game planning method for wind fire power grid is proposed. Firstly, combined with renewable energy quota system and green certificate trading mechanism, the game relationship of generation network under high penetration rate is analyzed. Then, a two-stage planning model including master-slave game between network sources and cooperative game of wind power generation is established with grid expansion scheme and wind power capacity as decision variables, and a profit distribution method considering economic and environmental gains of both partners is proposed.
Numerical simulation of geothermal energy from dry hot rocks with gravity heat pipe
Authors: Zhang Yapin , He Zhiyin , Qu Fangfang , He Dejia , Hao Haohao , Jiang Haochen
Published: February 2021

Dry-hot rock is a kind of new geothermal energy with abundant energy storage. At present, the extraction of dry-hot rock geothermal energy is mainly through artificial fracturing of the rock mass by injecting water as a working fluid. The heat energy is extracted with water as a heat-carrying medium.This paper combines super-long gravity heat pipe with dry-hot rock, and buries carbon dioxide in dry-hot rock as artificial heat storage. Then, the feasibility of extracting geothermal energy from dry-hot rock by 2500m super-long gravity heat pipe is studied by numerical simulation.The artificial heat storage of carbon dioxide dry-hot rock is equivalent to porous continuous medium model. The temperature field distribution, pressure field distribution and velocity field distribution were simulated by Fluent software to analyze the evaporation and condensation process of liquid refrigerants in heat pipes at different times.Through numerical simulation, it is concluded that water vapor at 80°C can be obtained at the outlet of overlength gravity heat pipe, and the flow rate of water vapor is about 2m/s. The scheme of extracting dry-hot rock heat energy by overlength gravity heat pipe is feasible.
Comprehensive Benefits Evaluation of Solar Water Heating System Application in Energy Efficiency Retrofit of Existing Residential Buildings in Cold Climate Zone
Authors: Liu Yiyang , Zhang Meijie , Shen Zebin
Published: February 2021

The application of renewable energy in energy efficiency retrofit of existing residential buildings is very important for energy conservation and emission reduction. Promoting the application of solar water heating system is conducive to the construction of comprehensive technical system for energy efficiency retrofit of existing residential buildings. Based on the case study, this research uses the comprehensive benefits evaluation methods to evaluate solar water heating system application in energy efficiency retrofit of existing residential buildings in cold climate zone, and concludes that the payback period and internal rate of return are 13.5 years and 4.11% respectively. It is suggested that electricity should be chosen as the auxiliary energy of solar water heating system and the government should increase subsidies and develop incentive mechanisms to encourage the application of solar water heating system.
Multiple Load Characteristic Analysis for Interacted and Interconnected Micro Grid on Pelagic Clustering Islands
Authors: Hou Ting-ting , Zou Yu-xin , Chen Zhu , Ding Heng , Fang Reng-cun , Lei He , Yang Dong-jun , Sang Zi-xia
Published: February 2021

With the gradual emphasis on the development and utilization of islands, the energy supply problem of islands far away from land-based has become increasingly prominent. Based on the traditional single energy acquisition method, this paper establishes an island independent energy cycle system with high reliability power exchange ship as the main part, tidal energy and photovoltaic power generation as the auxiliary. It has opened up an effective way to meet the needs of military life and production on the island.
Effects of energy saving and emission reduction in the heating system part of the energy-saving renovation of existing buildings—Based on China’s first residential area with a 75% energy saving standard
Authors: Zhang Meijie , Liu Yiyang , Shen Zebin
Published: February 2021

The energy-saving renovation of existing buildings in China has achieved initial results and improved the living conditions of residents. This article analyzes the data on the renovation of the heating system of China’s first residential area with an energy-saving standard of 75%. Through data measurement, recording and calculation, the effect of energy saving and emission reduction after heating system transformation is obtained. At the same time, using the graph to obtain the curve of the heating flow with the outdoor temperature, it is concluded that the climate compensator has a significant role in intelligent regulation and still has a 5% energy saving potential.
Consistency of Standards and Conformity Assessment: Market Supervision Offers Two Driving Forces for Green Recovery
Authors: Pan Ke , Xu Bingsheng , Jin Chenhong , Wang Bo
Published: February 2021

This paper is to discuss the impact of the consistency of standards and conformity assessment on green recovery with enterprises as the main body, especially the resumption of work and production under the background of COVID-19 epidemic situation and the transformation of export to domestic sales. Special attention is paid to the operation status of enterprises as market entities and the survival status of some multinational enterprises in the gap between standards and conformity assessment. In addition, resposibility of market regulation to improve the consistency of standards and conformity assessment to promote green recovery is also discussed.
The adjustment strategy of ecological land use in the process of urbanization in the suburbs of big cities: A case study of Jizhou District, Tianjin
Authors: Bo Liu
Published: February 2021

With the rapid development of rural urbanization, ecological problems have become increasingly serious, so the protection of ecological land is very important. Using vector images from 2010 to 2014 in Jizhou District, Tianjin City, supported by GIS technology, the land use types in Jizhou District, Tianjin City are divided into three categories: cultivated land, construction land and ecological land, and the ecological land is divided into three categories. It is divided into five categories: plantation land, forest land, grassland, water area and water conservancy facility land, and unused land, using methods such as ecological land area change rate and land use transfer matrix model to conduct research and analysis. Studies have shown that the ecological land in Jizhou District of Tianjin has been decreasing year by year in the past five years, and most of the ecological land has been transformed into construction land; the amount of woodland has changed the most drastically, the land for plantation has changed the fastest, while the amount of unused land has shown an overall upward trend.
A New Active Power Filter Partition Allocation for Distribution Networks
Authors: Deng QinRui , He YingJie , Lei Chao
Published: February 2021

At present, the power quality compensation device configuration algorithm in distribution network is often very complex.Therefore, the dominant gene rules in nature are simulated and introduced to the algorithm.An optimal configuration model for harmonic compensation devices is established, which takes into account the weak coupling between different loads and compensation devices.Finally,the Implicit genetic rule of adaptive discrete genetic algorithm (IGADGA) gets rapid convergence and high precision, and the algorithm is validated by computer simulation.
Research on the Efficiency of Green Innovation in Cities in the Yellow River Basin
Authors: Lu Wangmin
Published: February 2021

This paper constructs an evaluation system of urban green innovation efficiency, and based on SBM-Undesirable model, calculates the green innovation efficiency of 56 cities in the Yellow River basin from 2013 to 2017, with a view to evaluating the green innovation efficiency of cities in the Yellow River basin. The study finds that, between 2013 and 2017, the overall green innovation efficiency of cities in the Yellow River basin is at a low level, with a mean value of only 0.535. The inner differences of green innovation efficiency between cities in the Yellow River basin are large. At the same time, cities in the lower reaches of the Yellow River basin have the highest average green innovation efficiency, followed by cities in the upper reaches. Cities in the middle reaches of the Yellow River basin are relatively low, so there is still much room for improvement.
Vibration Energy Storage System of Subway Track Based on Piezoelectric Cantilever Beam
Authors: Zhang Qibin , Wang Jinyan , Ding Hantao
Published: February 2021

As an efficient urban transportation mode, subway has been developing rapidly in China, which provides convenience for people to travel and also produces certain vibration pollution. How to "turn this pollution into treasure" has become a widely researched problem for scholars. The advent of piezoelectric materials provides a good solution for the collection of vibration energy. In today's increasingly short of natural resources, if the vibration energy can be reasonably used, energy-saving benefits can be greatly improved. In this paper, the subway track vibration model was formulated which mainly considered the effect of vertical vibration on the track, moreover, the piezoelectric cantilever working mode attached to the rail was analyzed, together with the establishment of the subway track generator equipment model. In this paper, the matching rectifier, filter and boost circuit are designed and the software simulation is carried out. The simulation results showed that the scheme was feasible and available to provide reference for the application of vibration energy storage system for subway track.
Research on Utilization of Ship Waste Heat
Authors: Zihan Yang , Xiaoliang Dong
Published: February 2021

Since the oil crisis in 1973, world oil prices have continued to rise, and ship operating costs have risen year by year. In 2013, the ship energy efficiency design index formally took effect, setting a rigid indicator for ship CO2 emissions, bringing a new round of technical competition to ship construction, and the application of waste heat utilization technology has a significant effect on improving the efficiency of diesel engines.
Whether indirect water could be ignored in the virtual water content of agricultural production?
Authors: Hou Shan , Guo Huiting , Pan Ke , Liu Jing , Zhang Lijia
Published: February 2021

The study of virtual water content (VWC) of crops can provide a basis for agricultural water resources management and a way to improve agricultural water use efficiency. The existing calculation methods on VWC of crops only considered the direct water use of agricultural production while ignoring the indirect water use of agricultural production. The use of essential inputs for agricultural production including chemical fertilizers, pesticide, and agricultural machinery power are bound to bring indirect water for VWC of agriculture production. We calculated the indirect water of strawberry in Inner Mongolian based on the Input-Output method, to study whether indirect water could be ignored in the VWC of agricultural production.
Adsorption characteristics of recycled construction waste particles for ammonia-nitrogen in rainfall runoff
Authors: Zhou Wangwang , Wu Wenyu , Xie Tiantian , Hou Meifang , He Kun , Sun Haiyan
Published: February 2021

In order to explore the removal method of ammonia nitrogen in water and solve the disposal problem of construction waste.After the construction waste is crushed,the particles with different sizes (recycled particles for short) are screened out for ammonia nitrogen adsorption in simulated wastewater.SEM,EDS and BET were used to characterize the recycled particles, and the effects of different external factors on adsorption efficiency and ammonia nitrogen removal rate under dynamic environment were investigated.The results show that: The surface of the recycled particles was rough and had a large number of pores.The adsorption process follows the pseudo-second kinetics and Langmuir isotherm adsorption model;the maximum adsorption capacity of the recycled particles of 0—2mm, 2—3mm, 3— 5mm and 5—10mm were 0.1169mg/g, 0.1213mg/g, 0.1200mg/g and 0.1182 mg/g, respectively;the optimal pH was 6—7; Na+ had a slight effect on ammonia nitrogen adsorption.In the static adsorption experiment,the large size recycled particles have a higher adsorption capacity,while in the dynamic adsorption experiment,the small recycled particles have a higher adsorption capacity.
Estimation of Ecological Compensation Standard Based on Ecological Service Value Calculation
Authors: Fu Yicheng , Cui Xiaoyu , Zhao Jinyong , Zhang Chunling , Yan Lijun
Published: February 2021

The static calculation of ecological service value is the main basis for determining the value of water ecological service function in a river basin. The reasonable ecological service value calculation is the premise to determine the limit value of ecological compensation standard. Based on the types and calculation methods of watershed water ecological service value, on the basis of comprehensive comparison of the applicable scope and reliability of calculation results of various calculation methods, combined with the landscape characteristics of the study area, the ecological value assessment method of watershed forest system was given. Taking the Shanxi reservoir area in the Feiyun River basin as an example, the ecological value of the four service functions of supply, regulation, culture and support services was calculated, and the total ecological service value of the reservoir area was determined to be 7.062 billion yuan/a. The ecological services value of the forest in Shanxi reservoir area in terms of water retention, environmental purification, and reduction of soil waste requires cost inputs from the people upstream of the reservoir area. In order to achieve the overall equitable, coordinated and sustainable development of the basin, the beneficiaries of the downstream ecological service value of the basin should compensate the upstream 1.498 billion yuan/a, which is about 21% of the ecological service value.
Research on Wet Regeneration Process of Animal Glue Waste Sand for Foundry
Authors: Wenchao Cui , Tianshu Wang
Published: February 2021

The waste sand can be recycled to reduce the production cost. In this paper, the wet reclamation technology of phosphate modified animal glue used for foundry binder was studied. The results show that: the regeneration process is two times of continuous regeneration, the water sand ratio is 2:2.2, the regeneration time is 6min, the speed is 250rrmin, the ignition loss of the reclaimed sand is 0.30%, the mud removal rate is 82.5%, the average fineness is 51, the tensile strength of the reclaimed sand is 2.59MPa, which is similar to the original sand, and the wet reclamation effect is better.
Effect of EOR Chemical Flooding on Local Microbial Ecological Characteristics in Oilfield Mining Area
Authors: Hu C.H. , Li J.B. , Ma H.B. , Liu Q.C. , Wen J. , Pan Q. , Xiao C.M. , Yang C. , Guo F.
Published: February 2021

The 16SrDNA of total microbial DNA in 26 soil samples from three mining areas of an oil field was analyzed by high-throughput sequencing. The study found that the local microbial species in the mining area were rich, the pedigree was developed, and the dominant species were obvious. The differences in soil bacterial and fungal communities among the three mining areas were far greater than those within the group of four types of samples in the three mining areas. The study shows that the impact of chemical flooding on the local biodiversity of the oilfield is not different, and the impact on the local biodiversity of the oilfield mining area is large. There is no destructive impact on the environment.
Research progress on the influence of irrigation methods on ammonia volatilization in farmland
Authors: Song Chunni , Jiao Yan , Yang Wenzhu , Yu Yaze , Zhang Jing , Liu Yubin
Published: February 2021

Ammonia volatilization is an important way to lose nitrogen fertilizer in Agricultural Ecosystems, and the main source of ammonia volatilization in the world comes from ammonia volatilization in agriculture. Ammonia volatilization not only reduces the utilization rate of nitrogen fertilizer in farmland, leading to the waste of resources, but also leads to environmental problems such as air quality decline, soil acidification and water eutrophication. The paper reviews the characteristics of furrow irrigation, drip irrigation and sprinkler irrigation and the research results of soil ammonia volatilization under several irrigation methods. It provides a theoretical basis for selecting suitable irrigation management measures to reduce the emission of ammonia volatilization in farmland system.
Creating the Sense of Place in Urban Public Space with the Theme of Media Culture Center—Take Yangliuqing Town in Tianjin as an Example
Authors: Xiangrui Sang
Published: February 2021

The development of urbanization is squeezing the public space of the city. Compared with the public activities in reality, more and more people tend to indulge in the entertainment activities in the virtual world. The loss of the original place and the lack of motive force for creating a new one lead to the phenomenon of urban alienation. In order to prevent the development of the city towards the trend of losing place and losing recognition, creating a sense of place in urban public space has been a key issue. As the media of culture, emotion and information, the media and concrete media culture centers in the new era play an important role in the preservation and remodeling of the spirit of place and the diversified development of urban public space.
Analysis and Suggestions on Classification and Recycling of Urban Domestic Waste
Authors: Li KeLin
Published: February 2021

Garbage classification is an important link in the construction of the urban environmental governance system, and it is also one of the most effective ways to solve the garbage problem. At the same time, the garbage classification and resource utilization system is an important part of the national system. Although China's waste classification has been advocated for nearly 20 years, urban residents still face problems such as low participation rate and insignificant classification results. This article will start with the actual needs and status quo of garbage classification and recycling in daily life, analyze the urban garbage recycling system and existing problems in china, and give relevant suggestions for further improvement of china's current laws.
The influence of contaminated sediment backfill technology (CSBT) on bed stability through flume experiments
Authors: Li Xiaocui
Published: February 2021

Bed stability is directly related to sediment resuspension and internal pollutant release, which provide an important physical basis for natural water internal pollution control. Contaminated sediment will release accumulated pollutants into the overlying water because of the instability of the riverbed and become a potential source of internal pollution. In this paper, the influence of contaminated sediment backfill technology (CSBT), i.e., the calcination of dredged sediment into ceramsite after dewatering and pollutant fixation, followed by backfilling to the dredged area, on bed stability was investigated through flume experiments. Acoustic Doppler velocimetry (ADV) was used to measure the hydrodynamic characteristics in the flume. The results show that CSBT can increase bed stability and make the water-sediment interface clear. In addition, the porosity increased after backfilling ceramsite, increasing the effective expansion of oxygen. This study provides a new idea for river and lake ecological management and environmental restoration.
Does the pollutant charging system effectively reduce PM2.5 concentration? Evidence from 255 cities in China
Authors: Liu Guixian , Dong Xiucheng , Li Jiaman , Jiang Qingzhe , Kong Zhaoyang
Published: February 2021

Based on the panel data of 255 Chinese cities from 2007 to 2015, this paper empirically analyzes the impact of the Pollutant Charge System (PCS) on PM2.5 concentration. At the same time, a heterogeneous analysis of the level of economic development, pollution level, and local leadership characteristics was carried out. The results found that: First, when the levied price of sulfur dioxide emissions increases by 1 RMB/kg, the PM2.5 concentration drops by 1.307 mg/m3. Secondly, the lower the economic level, the better the effect of PCS on haze pollution control. Third, the lower the PM2.5 concentration, the better the effect of PCS on haze pollution control. Fourth, in cities where the mayor has working experience in state-owned enterprises, PCS has a better control effect on haze pollution. Finally, three suggestions were made.

JEL Classification: C33; Q53; Q58
Impact of urban form on Land Surface Temperature (LST) based seasonal characteristics: Empirical study from Nanjing
Authors: Zhang Shuainan , Wang Peng
Published: February 2021

A good urban thermal environment is of great importance to the quality of human settlements and the sustainable development of cities. However, with the development of urbanization, the change of urban form such as the increase of impermeable area caused the increase of LST. This study will take the 11 districts of Nanjing as study area to evaluate the influence of urban form on LST from three dimensions: land use, landscape index and traffic accessibility. The study found that there was a significant positive correlation between road network density (RND) and LST7 (land surface temperature in July) (1% significance level). Following that, there were patch density (PD) (5%), patch cohesion index (COHESION) (5%) and PVA (10%), all of which were negatively correlated with LST7. However, the regression fitting degree of LST1 (land surface temperature in January) and urban form index was only about 2%. Besides, different regions are affected by urban form indexes in varying degree. The study provides scientific implications for relieving surface temperature and improving thermal environment in Nanjing city.