bluuebunny/crossref_metadata_2025 huggingface dataset:
Shape of the Equilibrium Profile of Watercourse Based on Theory of Minimum Energy Dissipation
Authors: Baowen Yan , Xianwen Li , Songbai Song
Published: September 2019

There is certain orientation in the development of the fluvial geography, because the process is controlled by the Theory of Minimum Energy Dissipation. According to the theory of entropy and take equilibrium profile of watercourse as example, this paper discussed the theoretical shapes of the fluvial geography after analyzing the mathematics innate character of Theory Minimum Energy Dissipation. Studying result shows that the equilibrium profile of all watercourses should be a cycloid line. Thus point out a new thinking method to the study of the unity of topography in fluvial geography.
The three-dimensional numerical analysis of the impact of newly Seawall with inner epeirogenic through blowpipe to adjacent pile foundation of bridge
Authors: Chuan Zhan , Yannan Shi , Xiongwei Wu
Published: September 2019

The internal force and deformation of the adjacent bridge pile foundation is influenced by newly Seawall with inner epeirogenic through blowpipe, which may endanger the normal operation of the bridge. Using Plaxis3D software in this paper, the subsoil is used by the Hardening Soil model, and analysis the mechanism of the influence of bridge pile foundation by the newly Seawall with the inner epeirogenic through blowpipe when the distance between Seawall and bridge is changed from 200m to 250m, 300m, 350m and so on, which provides reasonable safety distance between the Seawall and bridge. The analysis results show that the vertical displacement and internal force of bridge pile foundation is less affected by the newly Seawall with the inner epeirogenic through blowpipe, which will not affect the bearing capacity of the bridge pile foundation. However, the horizontal displacement of pile foundation of the bridge is greater influenced by newly Seawall with the inner epeirogenic through blowpipe, which will affect the normal operation of the bridge. As long as reasonable rate is controlled by epeirogenic through blowpipe, the max horizontal displacement of pile foundation can meet the design requirements when the distance is 300m between Seawall and bridge.
Effect of Environmental Factors on Dirt Retention of Composite External Insulation Equipments
Authors: Chao Yafeng , Zhang Liu
Published: September 2019

In order to study the influence of the environment on the dirt retention characteristics of composite external insulation equipments, 43 composite insulator samples were sampled and measured at 32 sampling points of 12 lines of 110-500kV and DC ±500kV lines. The test results show that the mean value of ESDD in the sampling area is 0.060 mg/cm2, and the mean value of NSDD is 0.446 mg/cm2. It is found that The holistic dirt retention in industrial and mining areas is more serious than that in other sampling environments, and the dirt retention difference of composite insulators in different areas is large, which may be related to such factors as geographical environment, pollution time, climate, meteorology, industrial structure and economic development.
Design and Implementation of Super-station Measurement and Control Software
Authors: OuYang Wen , Wang Ancheng , Jiang Lixing , Gu Youyi , Li Chenyang
Published: September 2019

Measurement and control software of super-station is the core part of super-station and it is also the important part of realizing super-station function. Aiming at the functional characteristics of the super-station, this paper designs the measurement and control software of the super-station and implements it by programming, focusing on the three aspects of the design requirements of the super-station. The interface connection between the measurement and control software and each unit of the super-station is solved in the design. In the aspect of the realization of measurement and control function, the design scheme and flow chart are defined, and the control instruction analysis and interface design are carried out. In the database module, by transplanting FATFS file system, the operation of adding, deleting, modifying and checking measurement data can be realized in the form of files. Finally, we summarize the main work and shortcomings of the design.
Summary of landscape pattern research
Authors: Li Qi , Xiao Xie
Published: September 2019

With the development of landscape ecology in China, the landscape pattern has been studied as a hot spot and a core issue. The concept of landscape and the development of landscape pattern research reflect the deepening of scholars’ understanding of the relationship between nature and people. This paper first briefly introduces the concept of landscape pattern, and attempts to explore the development history of the concept of landscape from horizontal and vertical. The development of the research on landscape pattern in China is summarized from the publication years, research methods and publications. This paper analyzes and discusses the research progress of landscape pattern theory and its application in different fields, and puts forward its research hotspots and development trends, which provides reference for future research of Chinese scholars.
Shipping Density Assessment Based on Trajectory Big Data
Authors: Dai Zeyuan , Zhang Lihua , Jia Shuaidong , Pang Hengxiu
Published: September 2019

Due to the current shortage of maritime shipping density assessment methods, a method of shipping density assessment based on trajectory big data is proposed. Firstly, in order to obtain the trajectories following the actual situation, the AIS data is pre-processed. Secondly, as the minimum calculation unit, the grid is constructed, and the shipping density assesses evaluation index is established by comprehensively considering among the travel time, information transmission and the number of vessel crossing grids. Finally, with the proposed evaluation index, the shipping density is assessed quantitatively. The experimental results show that the proposed method can characterize the maritime shipping density and provide a new solution for maritime traffic situational awareness.
Discussion on the Application of Water Acoustic Instrument in Port Dredging
Authors: Sun Chao , Wang Nan
Published: September 2019

The measurement and dredging of sediments in ports and waterways is increasing. The most common and cost-effective method for detecting the structure and properties of underwater sediments is to use acoustic principles to detect them. In this paper, the principle of shallow depth profiler and multi-beam sounding system is introduced. The principle of acoustic sounding instrument in dredging measurement is introduced. The feasibility and application scope of such acoustic instrument in port dredging measurement are discussed.
The Informational Dynamic Design and Construction Technology Application in the Soft Rock Tunnel
Authors: Zheng Jinming , Xie Fengyu , Bai Youliang
Published: September 2019

Informational dynamic design and construction technology are emerging new technologies at home and abroad. There are many applications in deep foundation pit stability, side slope stability, tunnel engineering and bridge engineering. This paper takes the West Qinling soft rock tunnel as an example to discuss engineering pre-design, construction and information collection, and pre-design modifying. Finally, this paper lists some problems in the construction of the soft rock tunnel project.
A Recognition Method of Ring Pattern in Road Networks Based on Graph Theory
Authors: Cui Xiaojie , Gong Xianyong , Zhang Qi
Published: September 2019

As a kind of typical structural knowledge, the spatial pattern is important to cartographic generalization, multi-scale representation, and spatial data matching. In an urban road network, the global ring is a common pattern, which represents a closed, circular ring that surrounds the city center. To overcome the deficiency in multi rings recognition, a two-step method for global ring patterns is developed in this paper. Preliminary rings are extracted based on the angle and deflection side of the connected road segments. Moreover, global rings are selected from the preliminary rings based on the index of compactness. Simulated and actual road network data are used to validate the proposed algorithm. The results show that the proposed algorithm is capable of recognizing global rings with multi-layer conditions in urban road networks
Time-Frequency Analysis and Identification method for weak Magnetic signal of Submarine in aeromagnetic Detection
Authors: Liu Zhanxin
Published: September 2019

As an important strategic weapon, submarine detection is very difficult. Aeromagnetic detection is one of the main detection methods, but there are some problems such as complex measurement environment and difficult recognition of target magnetic signals. To solve this problem, wavelet threshold denoising is used to suppress magnetic noise, and WVD is used to analyze the magnetic signal in time and frequency to improve the recognition ability of the unexploding target magnetic signal. The simulation results show that this method is feasible.
A New Dynamic Emissivity-retrieval Scheme Based on Wavelet Atlas Constraints and Its Application into Land Surface Satellite Data Assimilation
Authors: Huang Qunbo , Yan Yan , Luo Yu , Wang Weifeng , Liu Bainian , Zhang Weimin , Xing De
Published: September 2019

Accurate description of surface information, including land surface emissivity, is a prerequisite for assimilating satellite observations over land. In this study, we used an emissivity atlas, essentially an image matrix containing noise from unknown sources, to improve the assimilation of observational data. First, we proposed a wavelet method for advanced image processing to denoise the emissivity atlas and developed a wavelet emissivity atlas suitable for the temperature sounder onboard the Chinese FY-3C satellite. Second, based on a real-time pixel dynamic emissivity retrieval scheme and using the wavelet atlas as the constraint set, we constrained dynamic retrieval emissivity values to eliminate retrieval errors. Finally, we designed and optimized a new assimilation system that can successfully utilize low-level microwave sounding channels of the FY-3C satellite. The results showed that the first-guess departures of the middle- and low-level channels were significantly improved as a result of the improved surface emissivity values. Compared with the emissivity atlas scheme, over-land observational data of the middle- and low-level channels could be increased by approximately 4–8%. Moreover, the addition of a large amount of new observational data did not negatively affect the analysis fields but rather improved short-term prediction results.
Study on the Soundings Arrangement of Seafloor Topography Representation Model
Authors: Yang Cui , Zhongshan Yao , Yonghou Zhang , Baoping You , Na Chen
Published: September 2019

The representation method for submarine topography is mainly the sounding notations combined with depth contours representation currently, and the sounding notation is the important part of the seabed terrain representation model. The most commonly intuitive and used seabed terrain representation model is the chart. The users understand the sea area through the interpretation of depth notation in chart, which contribute to achieve safe navigation and well-off exploitation. The density of bathymetric notation is specified in various regulations on charting that proposed by the state, thus the arrangement of soundings is only mentioned simply without stating any reason. Based on the characteristics of seabed topography and the features of hydrographic survey, the conditions that the soundings arrangement should satisfied are analysed, two types of soundings notation places which can meet the conditions are induced. Finally, the two arrangements are compared on the representation ability, and accuracy and feasibility of the rhombohedral arrangement are verified better by the results of the statistical calculation.
Research on the Beautiful Rural Design of Koreans – Taking the rural planning of Jing Xin Town in Hunchun as an example
Authors: Zhou Huanyu , Jin Guanghu
Published: September 2019

As the acceleration of China’s growth continues, both urban and rural areas of China have received comprehensive planning in its land management. China’s construction industry continues to bloom into a new era. With the unique historical and cultural background of the Korean people, China’s Yanbian prefecture has become its own individual region brought forth by Korean traditional culture. As a cross-border ethnic area, making rural planning and designs without losing the historical distinct cultural characteristics of the area has become a key issue that requires focused planning in the Northeast.
Analysis on the Evaluation Method of In-Plane Rigidity Performance of Floor System
Authors: Zhang Zaihua , He Ran , Zhang Dan
Published: September 2019

Structural analysis usually divides the rigidity performance of floor system into three types: rigid, stiff and flexible.For specific engineering buildings, how to evaluate their rigid performance, there is no uniform regulation in national regulations. Based on the general analysis of the relative specifications and research contents of the rigid performance of the floor, two types of analysis and evaluation methods of the rigid performance of floor system are summarized,type I and type II method.The type I method is more convenient to use.The type II method can directly reflect the the essence of the rigid performance of the floor,but it is more complicated to use.
Energy performance and CO2 emissions of fuel cells for residential application in Chinese hot summer and cold winter areas
Authors: Gong Xinzhi , Wu Nong , Li Chuancheng , Liang Miaomeng , Akashi Yasunori
Published: September 2019

The energy consumed in residential buildings has become a key factor in China. An energy-efficient and low-emission fuel cell co-generation system (FC-CGS) is a promising electric and thermal energy generation technology to enhance the energy-saving effects for residential application. SOFC-CGSs and PEFC-CGSs are the two major types of residential FC-CGSs. This paper aims to analyze the energy-saving effects of FC-CGSs for residential buildings in Chinese hot summer and cold winter areas. Changsha city is selected as an example. This study at first outlines SOFC-CGSs and PEFC-CGSs, introduces the simulation methods and develops a standard family model for simulation, then calculates domestic demands of the system, and finally compares the primary energy consumption and CO2 emissions of FC-CGSs with those of a traditional power and heat generation system based on gas and electricity. The results show that residential PEFC-CGSs offered primary energy reduction of 8.8% in winter. However, the average reductions of primary energy and CO2 emissions of SOFC-CGSs were 15.1% and 9.9%, respectively.
Optimization of passive design measures for residential buildings in Chinese hot summer and cold winter areas
Authors: Gong Xinzhi , Jia Chenyang , Yu Yilei , Li Chuancheng
Published: September 2019

Passive design, which includes several passive design strategies like shading devices and insulated envelop, is the most economical effective strategy for reducing energy consumption inside residential buildings. To investigate the impact of passive design on building thermal performance, a representative city Wuhan in Chinese hot summer and cold winter areas was selected for optimum analysis. The design parameters required for the climate of Wuhan using the Climate Consultant Software and passive strategies were analysed through the DesignBuilder Software in this paper. The results show that the optimization of passive design could reduce the annual primary energy by 52.2%. It will guide the architect in his choice of appropriate passive measures directly for the hot summer and cold winter region in China.
Research on energy efficiency for residential buildings in variation characteristics of regional climate
Authors: Hu Bing
Published: September 2019

The energy-saving and emission-reducing routes of buildings under the temporal and spatial changes of climate in hot summer and warm winter regions are formulated. Based on the results of climate model, building model and dynamic energy consumption analysis model, the energy consumption trend of typical buildings in the future climate environment is predicted, and the key influencing factors of building energy consumption under the East Asian monsoon region in Guangdong Province are analyzed. The simulation calculation and optimization analysis are carried out for the core problems, and the energy saving and emission reduction route is put forward.
Research on the Correlation between the Elements of Visual Landscape and the Micro-thermal Environment in Universities and Its Optimal Design—A Case Study of Sichuan Agricultural University
Authors: Zhang Lingqing , Ma Qing , Zeng Jiamin , Li Hanmei , Jian Leiji , You Yang
Published: September 2019

The research on the micro-thermal environment of universities is conducive to improving the environmental quality of the campuses, however, there are few related Microscopic empirical research. The research goal of this paper is to take the Dujiangyan Campus of Sichuan Agricultural University as an example to explore the correlation between campus visual landscape elements and micro-thermal environment, and then propose a landscape optimization approach to improve the thermal environment. By way of a panoramic camera, a temperature measuring instrument, and a thermal imager, the panoramic view, air temperature and the surface temperature of the main landscape of 120 sites on the campus were collected through the system sampling method, elements of visual landscape and their spatial distribution were graded and quantified using artificial intelligence image recognition method and ArcGIS. The air temperature was taken as the dependent variable, and the elements of visual landscape and their surface temperature were taken as the independent variables during the experiment to analyze the coupling relationship between the campus micro-thermal environment and the landscape elements by way of the geo-detector. The results show that the campus landscape consists of five major elements: roads, buildings and structures, vegetation, people and vehicles. The distribution regarding the proportion of the field of view has significant spatial differentiation. Among the five visual landscape components, the artificial environment, such as roads, buildings and structures, has a relatively larger impact on the spatial differentiation of the campus thermal environment compared with other factors; The temperature of people, proportion of vehicles and vegetation surface temperature have less explanatory power for spatial differentiation of campus thermal environment; The proportion of the five types of elements and their surface temperature have no significant correlation with the campus thermal environment.
Regeneration Research on the Rural Landscape on the Basis of Cultural Gene
Authors: Ma Tianzi , Lv Liang , Tan Wenhao , Chen Rongyi , Pan Hui
Published: September 2019

Under the background of response to the call of rural civilization, it aims to solve the problems of serious cultural deficiency and withered of the rural landscape in the village folklore. By means of analysis on the overall of the basic conditions in the village of Tianzhu where She-ethnic minority group inhabiting in, the thesis cleared and analyzed the culture from the perspective of material and immaterial level in the rural landscape on the basis of a cultural gene. And then the atlas of the cultural gene in the area of She-ethnic minority group in Fujian will be constructed. Through the combination with the design elements for the rural landscape, the thesis puts forward solutions relatively for the five landscape elements including architecture, service facility, formation, plant, and water body.
Research topic: Tourists’ preference for public space based on Big Data online. Case study: Fuzhou National Forest Park
Authors: Lv Liang , Huang Haolu , Ma Tianzi , Liu Linfeng , Pan Hui
Published: September 2019

Taking the Fuzhou National Forest Park as the research sample, this study uses the crawler tool to capture the comments of tourists on the network of Fuzhou National Forest Park, and uses ROST6.0 information mining software to analyze the emotional distribution and classification of word frequency. When analysed, the results showed that:

(1) On the whole, tourists showed positive emotions towards Fuzhou National Forest Park, and the proportion of their neutral emotions and negative emotions was small.

(2) Visitors’ favourite activities were “barbecuing”, “mountain hiking”, “leisure”, “walking”, “sightseeing”, “playing games”, “exercising”, “tourist-visit”, “entertainment” and “picnicking”.

(3) Visitors’ favourite scenic spots in turn were “Banyan”, “Sakura blossoms”, “Peach Blossom”, “Bird Language Forest”, “Longtan pond”, “trees”, “Botanical Garden”, “waterfall”, “vegetation”, “reservoir”, “garden”, “museum”, “Bamboo forest” and “Plank road”

(4) In the insufficiency aspect, the Fuzhou National Forest Park had the situation where there are too many people queuing up at certain times of the day.

Finally, a set of public space management mechanism based on Big Data is summarized, which provides theoretical support for its management and optimization.
Discussion on the Design Strategy of Urban landmark Space Based on Multi-perception Level
Authors: Wang Bing , Sun Hang
Published: September 2019

The paper is divided into three parts, at first, it discriminates the concepts about the landmark, urban landmark and urban landmark space. The author analyzes their design quality by three ways, on-the-spot survey, case analysis and questionnaire survey which contains a variety of urban landmarks space elements such as layout and structure, theme landmark, space accessibility and other aspects of cognitive meaning. This research is conducive of design and development for urban landmark space, and the conclusion of this paper is real significance of establishing the city image, creating the urban business cards, attracting the outer investors and improving the city’s comprehensive competitiveness.
Analysis of and Thinking on New Energy Enterprises Engagement in Standardization Activities
Authors: Li Jia , Pang Zhenghu , Liu Xiaonan
Published: September 2019

With the unprecedented development of new energy industry in China, new energy enterprises are also facing many problems, the most important of which is that the transformation of scientific and technological achievements into real productive forces is not successful enough. The paper studies the relationship between new energy enterprises and standardization activities, analyzes the policies on, challenges in and institutional construct to new energy enterprises engagement in standardization activities, and identifies the role and impact of new energy enterprises engagement in standardization. And it intends to provide the technical program for new energy enterprises engagement in standardization, thus enable them to establish scientific management, promote technological innovation and the transformation and application of scientific and technological achievements, finally achieves the purposes of environmental protection and economic sustainable development.
Study on reasonable gas recovery rate and adjustment scheme of bottom water gas reservoir
Authors: Zhi Ji-qiang , Liu Yi-kun , Bai Ming-xing , Jiang Nan , Gao Shuo
Published: September 2019

During the exploitation of bottom water gas reservoirs, the gas wells have a serious impact on the development of gas reservoirs. Based on the systematic analysis of the production dynamics and water intrusion characteristics of the bottom water gas reservoir in the XS gas field, combined with seismic, geological, well logging, production testing and other data, a numerical simulation model was established to demonstrate the rational gas production rate after gas reservoir seeing water. Research on the mechanism of water control. The gas reservoir numerical simulation technology is used to determine the reasonable gas production speed of the gas well, which can alleviate the bottom water coning rate and prolong the waterless gas production period. Combined with measures such as drainage, water shutoff, and shut-in, the rational gas production rate and adjustment measures for the bottom water gas reservoir are formulated.
The Analysis of Resistivity Characteristics and Mineral Composition of Qinghai Meteorolite
Authors: Wang Jianguo , Zhang Lei , Zhong Li
Published: September 2019

Qinghai Province is the second largest meteorolites falling area in China. The samples are provided by Tianshi Cultural Development Co., Ltd., and are numbered HYLYS-1, THYS-2, HTYS-3 and SMDYS-4, and the results of density test is 7.57g / cm3, 3.60 / cm3, 3.80/cm3 and 3.19 / cm3 respectively. Major elements include Al, Ti, Ni, Mg, Ca, Fe, K, etc. Trace elements include Co, Ba, Te, Cd, Ce, Li, La, Nd, Sr, etc. The results of testing shows that the resistivity of HYLYS-1, HTYS-3 is low, which indicates that there are many metal minerals such as iron and nickel, and the resistivity of THYS-2, SMDYS-4 is high, which indicates that there are few metal minerals. From the analysis of the chemical elements of the samples, resistivity is positively correlated with the contents of nickel and iron, and has good fitting degree. The main factors that affect the resistivity of the samples include meteorite structure, moisture content, mineral crystal, ambient temperature, porosity and so on. To study the resistivity characteristics of Qinghai meteorolites is an effective means to obtain the key information about the physical characteristics, structure, chemical components, the state of occurrence of metallic elements, mineral crystals and its arrangement, etc.
Design and Research of Unequal Distance Fan
Authors: Zhai Shufeng , Yao Qian
Published: September 2019

In this paper, the blade angle modulation method is used to design the unequal distance fan, and three unequal-distance fans with different blade spacing angles are designed. The aerodynamic noise and aerodynamic performance of three unequal-distance fans are analyzed and studied by CFD simulation method. The results show that with the increase of the uneven distribution of blades, the total A-weighted sound pressure level of the fan and the discrete noise of the fan at the passing frequency decrease significantly. The difference between the main aerodynamic performance parameters of three types of non-equidistant fans and equidistant fans is small, which shows that the unequal distance distribution has little effect on the aerodynamic performance while reducing the noise.
Analysis of Characteristics of the Combined Cooling Heating and Power System under Multiple Operation Modes
Authors: Dajun Wei , Han Hao , Shumin Sun , Yan Cheng , Ti Guan , Qiang Ma , Wenjie Ju
Published: September 2019

The Combined Cooling Heating and Power System (CCHP) system can achieve highly efficiency by energy cascade utilization, which is one of the core units of the integrated energy system in the future, with great development potential. Aiming at the complicated operation performance of the CCHP system, an operation characteristic analysis method is studied under multiple modes. Firstly, a typical simulation model of the CCHP system is established, while the energy flow is analyzed. Secondly, an evaluation system considering multi-dimensional indicators such as energy consumption, comprehensive cost and pollution discharge of the system is built. According to the electric and thermal load of a building, the capacity of the main equipment of the system is designed. Furthermore, the energetic, economic and environmental performances under “following electric load” (FEL) mode and “following thermal load” (FTL) mode are quantitively analyzed, comparing with the traditional separated providing system. The results show that this method reveals the advantages and disadvantages of the performances of the CCHP system under different operating modes, thus can provide a reasonable basis for the selection of operational strategies.
Numerical Simulation and Experimental Study on Blending Lignite from Bituminous Coal Boiler
Authors: Wang Qian , Kai WU , Zhuan LIU , Yong-jun XIA , Zhou Xu-guang
Published: September 2019

In this paper, the turbulent flow between gas-solid two-phase is used to calculate the turbulence model of RNG k- ε model. The trajectory field of pulverized coal particles is based on Lagrangian random particle orbit method. Radiation heat transfer was calculated by discrete propagation method; double parallel reaction model was adopted for the release of pulverized coal volatiles; gas phase mixed combustion was described by mixed fraction model; diffusion kinetic model was used for coke combustion; Lagrangian method was used for calculation of particle phase.
A Smart Substation Training Platform based on Primary Equipment Simulator
Authors: Zhang Yanjie , Zhao Xiaoxiao , Liu Xiao , Li Hongwei , Pan Zhiyuan
Published: September 2019

A training scheme based on combination of virtual substation primary equipment real secondary devices is proposed for smart substation accident management. The primary equipment simulator is implemented through communication between 3D cartoon server and simulated switch controller. Electronic current and voltage transformer is simulated by EMTDC transient model and FPGA+DSP terminal controller. A smart substation on-site training environment is established for the substation O&M personnel.
Mathematical Modeling Of The Hydrodynamic Forces On A Vertical Cambered Slotted Otter Board
Authors: Rao X , Huang H L , Chen S , Li L Z , Yang J L
Published: September 2019

As an important accessory of single trawl, otter board directly affects net horizontal expansion, further the catching and fishing efficiency[1-2]. For improving the fishing efficiency and technology level and solving the world energy crisis in some way, the hydraulic performance is chosen and the effects of different structural parameters are studied. Such as aspect ratio, curvature, bending and receding angle, deflector angle and slot width, number of slots and so on[3-10]. This paper selects a vertical cambered slotted otter board as research object, presents a principle of hydrodynamic efficient based on the experiment data, then a mathematical model of the hydrodynamic efficient is obtained. This model has been found as a function of angles of attack and deflector, and is suitable for similar otter board design and optimization.
Method of Analyzing Transformer DC Magnetic Bias Based on Big Data Clustering and Relevance Analysis
Authors: Yuan Pei , Wan Tao , Wu Xiaowen , Ye Huisheng , Mao Wenqi
Published: September 2019

In this paper, the big data analysis method is applied to the analysis of the factors affecting the DC magnetic bias of the transformer. The improved k-means clustering algorithm is used to identify the different magnetic reasons. The weighted relevance analysis is used to evaluate the influence of different factors on the magnetic current. Finally, the correctness of the method is verified by an example analysis, thus providing an effective basis for “one-button sequence control” DC magnetic bias treatment.
Research on Applicability of Fuel Cells in North China’s Residential Buildings：Based on Investigation of Living Habits and Energy Consumption of Urban Residents
Authors: Zhao Fei , Bi Wenxin , Sun Pengcheng , Gong Xian , Liu Guodeng
Published: September 2019

The state’s emphasis on energy conservation and emission reduction has been continuously strengthened, and the use of clean energy has received great attention. As the fourth generation of power technology, fuel cell technology has developed rapidly abroad. Household fuel cells have achieved market-oriented development in Japan. In order to understand the technical applicability of household fuel cells in China, a survey on household living habits and energy consumption in cities and towns was carried out. The application of fuel cells in China was preliminarily analyzed from three aspects: the situation of family members at home, the use of domestic appliances and bathing habits.
The effect of hot pressing sintering temperature and holding time on the properties of graphene/Cu layered composites
Authors: Zhang Dandan , Ye Yusong , Jiang Wei , Cao Xia , Xiao Huaxing , Shen Yan
Published: September 2019

Graphene is a promising reinforcement in metal matrix composites, which has been developing rapidly in recent years. The aim of this paper is to investigate the effect of sintering temperature and holding time on the properties of graphene nanoplatelets (GNPs)/Cu composites prepared by hot pressing. Sintering temperature and time were in the range of 550–750 °C for 0–60 min. A correlation is established between the mechanical properties of GNPs/Cu composites and sintering parameters. The results show that the variations in tensile strength of GNPs/Cu composites are dependent on both sintering temperature and time. With increase of sintering temperature, the tensile strength increases first and then decreases. When sintered at 650 °C for 30 min, the maximum tensile strength of 303 MPa is achieved. The tensile strength of GNPs/Cu composite sintered 30 min at 650 °C is also higher than that of 0 and 60 min.
An Estimation Algorithm of Extended Kalman Filter based on improved Thevenin Model for the management of Lithium Battery System
Authors: Li Peng , Chen Huan
Published: September 2019

We proposed a new estimation algorithm of extended Kalman filter (EKF) based on improved Thevenin model; Experiments were carried out to verify the validity with seven 4Ah lithium cobalt acid batteries in series. The experimental results showed that when using the algorithm, the estimation error of SOC is in the scope of error allowed, and the requirement of online SOC estimation can be satisfied.
Study on High efficiency pre-cracking Technology of Coal seam
Authors: Xiangbao Meng , Xuesong Ma , Zhenping Wang , Yansong Zhang , Xu Ma , Jiquan Sun
Published: September 2019

More than 90% of coal seams in our country are low permeability coal seams, which seriously affects the safety of mine production. Therefore, a kind of solid pre-splitting agent is studied in this project, and the effect of coal seam pre-splitting test is studied in Nantun coal mine. This paper introduces the action principle of the solid pre-splitting agent, and then tests and studies the fracture pore characteristics of the coal in Nantun coal mine, selects the reasonable pre-crack drilling arrangement scheme, carries on the coal seam pre-cracking experiment and collects the results. Through the comparison of the pre-splitting effect of coal seam, it is concluded that the pre-cracking radius of this technology can reach 25 meters, which makes the primary and secondary fractures in the coal body expand, the coal body joints, and the fracture penetration network, thus increasing the permeability of the coal seam. At the same time, a large number of uniform cracks were produced because of the pre-splitting, which improved the lump coal rate. The pre-splitting reduces the coal dust concentration and the strength of the coal body, and reduces the energy consumption of cutting ratio, thus realizing the energy-saving and clean mining of coal mine.
Studying on Conversion of Oblique Photogrammetry Data Based on OSG and ARX
Authors: Ming Ruan , Meiting Xie , Hua Liao , Fen Wang
Published: September 2019

Oblique photogrammetry data processing is a hotspot of current urban 3D model application research. Aiming at the problem that oblique photogrammetry data can not be directly loaded and displayed on AutoCAD, based on OSG 3D rendering engine and ARX secondary development technology, take the OSGB data into the DWG file as an example, this paper analyzes the oblique photogrammetry data format and the organization of the DWG model on AutoCAD and summarizes a conversion method of oblique photogrammetry data. The example shows that the method introduced in this paper can correctly realize the conversion of the oblique photographic data, and provides a reference for more industries to apply oblique photogrammetry data.
The Application of Shallow Seismic in the Exploration of Aeolian Sand Strata
Authors: Zheng Jinming , Xie Fengyu , Bai Youliang
Published: September 2019

Shallow seismic exploration has significant application effects in terms of bedrock surface and underground structure exploration, detection of underground cavities and unfavorable geological bodies. It is a scientific and economical technical method to provide basic information of feasibility study and engineering planning for site selection of highways, airports and high-rise buildings. Taking the pre-selection of a tunnel project in Gansu as an example, this paper elaborates on the interpretation methods and techniques of the shallow seismic exploration data processing in the aeolian sand stratum based on the geophysical characteristics of the work area. Generally speaking, the interpretation results are highly consistent with the drilling results and can be applied to engineering surveys in similar strata.
Study on spatial distribution and carbon balance of major carbon sources and carbon sinks in Nanjing
Authors: Yixin Huang , Xiangchen Xia , Lu Geng , Li Yang
Published: September 2019

In order to explore the current situation of carbon balance in Nanjing, with the above designated size industrial enterprises, 4993 residential communities and green areas as research objects, ArcGIS and ENVI software are used to spatially analyze the main carbon sources and carbon sinks in Nanjing. The calculation formulas of carbon sources and carbon sinks are used to calculate the carbon emissions and absorption of various districts in Nanjing, and compare the carbon balance of each district. The results show that: (1) the industrial and residential communities in Nanjing show the characteristics of agglomeration distribution; (2) the green land is mainly concentrated in the outskirts, which is mostly based on cultivated land; (3) the carbon balance coefficient of Nanjing city is 68, and all regions are in the carbon imbalance state, in which Qinhuai District is the most severe. Finally, from the planning point of view, suggestions for the construction of Nanjing City to improve the ecological environment of Nanjing and promote green sustainable development are proposed.
Research on P-Δ Effect Increase Coefficient of Independent Steel Tube Lightning Rods in Substation
Authors: Huang Zhenxing , Shu Yueshui
Published: September 2019

To optimize the design method of ISTLR (independent steel tube lightning rod) in substations, ANSYS was used to investigate increase coefficient (called P-Δ Effect increase coefficient) of top HD (horizontal displacement) of ISTLRs under wind load when considering P-Δ Effect compared with that not considering. The results show that the P-Δ Effect increase coefficient is about 1.05. Therefore, the HD of the top can be calculated without considering the P-Δ Effect when designing the structure of the ISTLRs. It can be multiplied by the P-Δ Effect increase coefficient 1.05 and controlled by not exceeding the limit value H/70 of the norm.
Thermodynamic Design of Public Space Based on Outdoor Thermal Comfort——Take Yangpu Bridge Riverside Park Competition Scheme as an Example
Authors: Li Linxue , Zhang Qi
Published: September 2019

This paper attempts to make outdoor thermal comfort as an evaluation index to apply in the public space design, trying to make the design achieve the goal of ideal comfort environment from the beginning to the completion, and to form a simulation optimization method of ‘Design Follows Comfort’. And the attempt takes a case in Shanghai, China as an example. In this case, UTCL is used as the evaluation index and ladybug simulation tool is used to evaluate outdoor thermal comfort and assist in optimizing architectural design. Optimizing the goal of thermal comfort in different stages of the design will help to integrate various elements of architecture so that the considerable comfort in severe climatic conditions will be provide to users.
Understanding and Practice of Room Temperature Control Method Based on Energy Saving Reconstruction of Public Buildings
Authors: Song Jing
Published: September 2019

In order to respond to national energy conservation and environmental protection policies, green building development strategies should be implemented in urban public buildings construction, and large-scale project energy-saving renovation plans should be implemented from the perspective of energy conservation. Different projects can adopt different energy-saving control methods according to actual conditions and adopt different control strategies, but the ultimate goal is to change the current situation of large energy consumption, high utilization efficiency, noise pollution, water pollution and air pollution emissions. Building energy-saving renovation and technical control, effectively improves the building energy-saving level, achieves energy-saving and consumption-reduction goals, and gives full play to the value of various resources. At the same time, the energy-saving renovation project can also help enterprises to obtain the maximum economic and social benefits and promote the sustainable development of the construction industry. In view of this, this paper will talk about how to achieve energy-saving goals in the energy-saving renovation of public buildings from the aspects of energy-saving design of indoor supporting facilities, energy-saving design of walls, energy-saving design of doors and windows and roofing energy-saving design, and how to achieve reasonable control of room temperature.
Identification of True and False Aksu Apple Based on NIRS and PLS-DA
Authors: Lv Chenfei , Yang Jinghui , Liu Yanjun , Yang Renjie , Zhang Chao , Wu Nan
Published: September 2019

A method for the identification of true and false Aksu Red Fuji apple varieties based on near-infrared spectroscopy (NIRS) and partial least squares discrimination (PLS-DA) was proposed and established. Authentic Xinjiang Aksu Red Fuji and ordinary Red Fuji (Shandong and Shanxi Red Fuji) were purchased from supermarkets. There were 42 samples in each variety, with totaling 126 samples. Near infrared diffuse reflectance spectra of all samples were collected in the range of 4000-12000 cm−1. On the basis of studying the characteristics of NIR spectra, the principal component analysis (PCA) was carried out. It is pointed out that PCA method cannot fully realize the identifcation of three kinds Red Fuji Apples. Finally, the partial least squares discriminant analysis model of three kinds Red Fuji Apples was established, and the correct discrimination rates of the three kinds Red Fuji Apples were 100% for samples in calibration set and prediction set.
Lead(II) removal from wastewater by water hyacinth
Authors: Yi Zhengji , Liu Jian , Liu Xing , Zeng Rongying , Cui Ying
Published: September 2019

Lead(II) contamination is a serious environmental problem. The purpose of this research is to discuss the feasibility of utilizing dead water hyacinth granule to eliminate lead(II) cations from aqueous solution through batch tests. Effects of contact time, medium acidity-alkalinity, and solution lead concentration on this biosorption process were detailedly studied. The experimental result suggested that the lead(II) biosorption depended highly on the medium pH. A pH of 5.0 was most helpful to lead(II) removal. The biosorption data conformed to pseudo-second-order kinetics and the biosorption equilibrium time was equal to 45 minutes. The biosorption isotherm data could be characterized using Langmuir model accompanied with the maximum biosorption capacity of 75.44 mg/g. Our findings revealed that water hyacinth could be an efficient adsorbent for lead(II) elimination.
Effect of Different Tillage Methods on Soil Emissions of N2O and Crop Yield in North China Grain Field
Authors: Xiaoxiao Shu , Li Qi
Published: September 2019

By analyzing the published literatures of wheat and maize fields in North China, the effects of different farming methods on N2O emissions and crop yields in grain fields were determined. The results showed that in the North China grain field, the no-tillage technology reduced the N2O potential in the wheat season, while the N2O difference in the corn season using no tillage, conventional tillage, deep pine and alfalfa was not significant. Therefore, the implementation of no-till measures in the north wheat grain field in North China can reduce emissions and increase production, while the corn field suggests conventional tillage, deep pine or alfalfa cultivation on the basis of straw returning, which can stabilize production and reduce emissions.
Effect of DGA substituent structure on rare earth extraction in nitric acid media
Authors: Du Huihui , Peng Xiujing , Cui Yu , Sun Guoxin
Published: September 2019

N substitutent group structure has great influence on the extraction and separation ability of amide extractant. In this paper, four different extractants with different structures, namely TODGA (N,N,N’,N’-tetraoctyl-3-oxa-diglycolamide), T2EHDGA (N,N,N’,N’-tetraisooctyl-3-oxa-diglycolamide), DPDODGA (N,N’-dipropyl-N,N’-dioctyl-3-oxa-diglycolamide) and DIPDODGA (N,N’-diisopropyl-N,N’-dioctyl-3-oxa-diglycol-amide) were investigated. The extraction ability of rare earth elements in nitric acid system was investigated to understand the relationship between chemical structure of the extractant and the extraction and separation properties of rare earth ions. The effects of nitric acid acidity, rare earth metal ion concentration and extractant concentration on the extraction were also investigated.
Experimental Study on Catalytic Oxidation of Toluene with Manganese Catalysts and Ozone at Low Temperature
Authors: Guan Jie , Wang Di , Yuan Hao , Guo Yaoguang , Dai Jue
Published: September 2019

The single metal oxide catalyst of transition metal element Mn and the composite metal oxide catalysts of Mn-Co and Mn-Fe are prepared by impregnation method using activated carbon (AC) as carrier. The catalysts are characterized by x-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The performance of the catalysts for catalytic ozonation of toluene is tested in a fixed bed tubular reactor. The results show that the activity of the single metal oxide catalyst of Mn is lower than that of the composite metal oxide catalysts of Mn-Co and Mn-Fe, and the activity of Mn-Co is higher than that of Mn-Fe. The catalytic efficiency of three catalysts is Mn/AC< Mn-Fe/AC> Mn-Co/AC. In this study, the factors influencing the degradation of toluene by catalytic ozonation are analyzed, and the mechanism is explored.
Preparation and Optical Properties of TiO2-SiO2 thin films by Sol-gel Dipping Method
Authors: Wang Jun , Ran Qianwen , Xu Xunhu , Zhu Binghua , Zhang Wenjuan
Published: September 2019

TiO2, SiO2 and TiO2-SiO2 thin films were prepared by sol-gel dipping method on glass substrates. The pyrolysis behavior of TiO2 and SiO2 dry gel were tested by differential thermal analysis (DTA). The microstructure and optical properties of the TiO2, SiO2 and TiO2- SiO2 were studied by X-ray diffraction (XRD) and ultraviolet and visible spectrophotometer. The results showed that the phase structure of the films was affected by the composition. All the films were transparent in the visible region. Meanwhile, the transparency of SiO2 was better than TiO2 and TiO2-SiO2 composite film. The ban-gap of the TiO2, SiO2 and TiO2-SiO2 thin films were 3.79, 4.01 and 3.91.