bluuebunny/crossref_metadata_2025_split huggingface dataset:
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.
Simulation analysis of optimization design strategy of natural lighting in office buildings
Authors: Wu Junsha 
Published: February 2021

Abstract
As an important indicator of building quality, natural lighting is an important way to save energy and improve visual comfort in buildings. Reasonable use of natural lighting can effectively reduce building lighting energy consumption. Taking an office building project in Wuhan as an example, the article analyzes from three aspects: overall design, deepening design, and other factors, and proposes natural lighting optimization strategies such as building orientation and form layout, atrium daylighting, daylighting openings. Through software simulation analysis, the strategy is verified, and the project design plan is optimized. Thus the optimization design strategy of natural lighting in office buildings is summarized, which provides reference for future lighting and energy saving research.