bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparative study on Equalization Technology of Lithium Battery packs for Electric vehicle
Authors: Yang R , Gao L , Wu T 
Published: April 2020

Abstract
As an important part of battery management system (BMS), battery equalization technology is of great significance to improve the utilization efficiency of battery energy and the mileage of automobile, as well as to prolong the service life of battery. This paper introduces the mainstream equalizing circuit and equalizing control strategies, as well as the estimation algorithm of equalization reference variables, points out their advantages and disadvantages, and finally analyzes the future improvement direction of equalizing technology in combination with the current.
Overview of Power Lithium Battery Modeling and Soc Estimation
Authors: He D W , Zhang W , Luo X Y 
Published: April 2020

Abstract
Power lithium battery is the hotspot of current research. This paper introduces the mechanism model and equivalent circuit model from the external characteristics and internal characteristics of lithium battery, and analyzes the applicable scenarios and principles of these two models. According to the existing model, the principle of the SOC, the advantages and disadvantages and the existing problems of the ampere-time integral method, the open-circuit voltage method, the neural network algorithm and the Kalman filter algorithm are introduced.
Cooling Performance for Cylindrical Film-Cooling Hole with Divided Downstream Crescent-Shaped Block
Authors: Zhang Pengfei , Tong Zhiting , Wang Fei , Bai Linchao , Zhang Chao 
Published: April 2020

Abstract
The cooling performances for the cylindrical film-cooling hole with divided downstream crescent-shaped blocks were numerically investigated in present study. Four configurations with divided crescent-shaped block, i.e. linear, 30° convergence, 30° expansion, and 30° curved expansion, were studied at typical flow conditions. The successive crescent-shaped block case and the no block case were also solved in comparison. The temperature profiles, the local and lateral averaged cooling effectiveness at blowing ratios of 0.5 to 1.5 were obtained. As compared with the successive block case, the lateral coolant coverage were widened by using the divided block, and thus the lateral averaged cooling effectiveness were improved, especially at higher blowing ratios. Comparatively, the cylindrical hole with 30° expansion crescent-shaped block exhibited highest cooling performance.
New Drilling Liquid Waste Harmless Treatment Technology of Research
Authors: Wang Yandong , Wang Tengfei , Yan Xiangyang 
Published: April 2020

Abstract
This paper briefly introduces the current status of drilling fluid waste and its impact on the surrounding environment. Based on the analysis of the current situation of drilling fluid waste in the oilfield, the evaluation criteria of drilling waste are clarified, and a new technology for the harmless treatment of water-based drilling fluid waste is proposed, which includes a new type of environmental protection agent and armored modularization. Design, automation and intelligent control, etc., hope to provide reference for the later drilling fluid waste treatment.
Research the effect of metal ions on polymer flooding
Authors: Pi Yanfu , Chen Hao , Zhao Wanrong , Dai Zhipeng , Liu Li , Zhang Naiyuan 
Published: April 2020

Abstract
In the physical model experiment, the polymer is usually manufactured by means of distilled water and sewage. In this paper, it was found by scanning electron microscopy that Ca2+ and Mg2+ contained in the formulated water reacted with -COO in the polymer. A sharp drop in the viscosity capacity of the solution, And the effect of Mg2+ on the viscosity of the solution is about 1.2 to 1.5 times than Ca2+. Metal ions have a negative impact on the extraction of polymers., The polymer’s adaptability to three ply of oil layers is reduced. Under the condition of high extent of mineralization, the displacement characteristics of the high-efficiency, Viscosity and Salt-resisting polymer is better than middle-divided HPAM, and the enhanced oil recovery value is 3.13% higher than middle-point HPAM.
Design and Efficiency Analysis of Small Displacement Pump
Authors: Cheng Tiancai , Jiang Minzheng 
Published: April 2020

Abstract
To address the common issues of low-production oil wells like unbalanced supply and output, low pump efficiency and system efficiency and high energy consumption, a small-displacement oil pump has been developed. The pump has an enhanced structural strength with solid plunger and the mobility of the pumping oil with offset outlet valve. The outlet valve is located at the highest point of pump chamber when the plunger is at the bottom dead center, which is preferable for the discharge of gas and high gas-liquid and pump efficiency improvement. Combined with the distribution law of oil and gas in vertical pipe flow, it is assumed that the dissolved gas is linearly distributed from the oil inlet valve to the bottom end of the plunger after the pump is introduced. According to the position of the oil pumping valve of the oil pump, the efficiency calculation formula is derived. Then through reasonable matching of working conditions, the influence of various factors on pump efficiency is analyzed. The pump’s pump efficiency is about 10% higher than the API minimum pump diameter (32 mm), which is important for energy saving in oil fields.
Research on energy supply of intelligent energy system with energy storage
Authors: Peng Liyuan , Zhang Xiaohui , Yuan Jianli , Fu Jia 
Published: April 2020

Abstract
The coordinated intelligent energy supply should consider the characteristics of the energy supply equipment, load characteristics and user needs. As a special energy supply equipment, water energy storage system has two-way controllability, which can store and release energy. Using its energy supply characteristics, combined with the system characteristics such as peak valley electricity price difference, it is helpful to achieve peak load reduction, balance load and save energy supply cost of the system. In this paper, an enterprise park is taken as an example to study the energy supply of intelligent energy system with water energy storage. An energy supply strategy is proposed. An energy supply model is established. At last, the simulation verifies the advantages of intelligent energy system with water energy storage.
Seasonal variation of background formaldehyde content in large squid from scientific research research vessel
Authors: Zhang Xuan , Kong Cong , Tang Yun yu , Fang Chang ling , Huang Xuan yun , Lou Xiao yi , Wang Yuan , Yang Guang xin 
Published: April 2020

Abstract
The background formaldehyde (FA) in large squid is determined through high performance liquid chromatography (HPLC). Its seasonal variation was further investigated. In autumn and summer, background FA content in Todarodes pacificus was higher, with the mean value up to 36.8 mg/kg in September. This study provide scientific data for the monitoring management of FA during the circulation and sale of squid.
Research and Design of Safety Early Warning System for Key Equipment of Small Hydropower Units
Authors: Mao Cheng , Su Li , Zhang Minwei , Liu Zhuoya , Li Linfeng , Shen Chunhe 
Published: April 2020

Abstract
With the improvement of equipment automation, safety warnings for equipment failures become rather important. This paper develops a small hydropower safety early warning system for several key equipment of small hydropower units. The system can analyze the unit, pressure pipe and governor and provide early malfunction warnings. At the same time, it summarizes the typical equipment failures. The mechanism, through the analysis of mass imbalance faults and the calculation of the counterweight angle, explains its accuracy and has certain practical value.
A new design of generator set controller in cloud service system based IoT technology
Authors: Shi Yuanqiang , Zhao Rongyong , Chen Hong , Wu Xuekui , Liu Qiong , Wang Yan 
Published: April 2020

Abstract
To solve the existing technical problems in quality management, distributed control, maintenance and monitoring management faced by traditional diesel generator set(GenSet), this paper summarizes the development status of traditional diesel generator set technology, and analyzes the business requirements of end users for distributed cloud control. Through the integration of traditional diesel generator cloud technology with internet of things technologies(IOT), a new design scheme of cloud GenSet controller is proposed based IoT technology, which simplifies the logic hierarchy of diesel generator cloud control. Then this paper puts forward the key network hardware design, and applies the new cloud GenSet controller to the enterprise new GenSet system, which verifies the feasibility and stability of the new design.
Research on the resilience analysis and promotion strategy model for electric transmission lines
Authors: Xu Fengjiao , Wanwang  , Qin Tingxin , Zhang Chao 
Published: April 2020

Abstract
Resilience is a capability that measures whether a system can change its state to reduce the loss of fault in case of serious disturbance or fault, and return to the original normal state as soon as possible after fault removal. Based on the resilience analysis model, this paper proposes measures to improve the resilience of transmission lines through qualitative or quantitative analysis, and provides technical support for improving the reliability of important transmission channels. This study illustrates the connotation of the concept of resilience, and the area model and expression of the impact of external impact on the system are established. This study takes the transmission line as an example and applies the area model to calculate, and puts forward the strategy to improve the resilience and the resource allocation scheme under the condition of limited resources.
Research Status and Progress of Nano Coatings for Steel Bridges
Authors: Wen Juan , Li Zheng , Hu Tao , Lu Cunfang , Gong Quan , Wu Deng , Chen Jun , Zhang Shaolin 
Published: April 2020

AbstractThe coating systems of steel bridges all over the world generally include primer, intermediate and top-coat. The performance of the coatings could be promoted drastically by adding the specific nano particles into the coatings. In this paper, the research status and progress of nano coatings for steel bridge were summarized. Previous research showed that graphene and nano scale Al2O3had significant effects on improving the adhesion performance and corrosion resistance performance of epoxy Zn-rich primer. Nano particles of ZnO, TiO2and SiO2could promote the weather resistance performance of top coatings, while nano-scale SiO2, Al2O3and TiO2substance could facilitate the mechanical properties of top coatings. Other nano-scale substance properties enrich the coating some further functions, such as self-cleaning, light storage, self-repair and so on.
Numerical Simulation on Hydraulic Characteristics of Spray Regulator Valve
Authors: Long-yu ZHOU , Si-ja Hao , Zhi-da YANY , Ying-zhe Hou 
Published: April 2020

Abstract
The hydraulic properties of the internal fluid of the spray regulator valve are studied by numerical simulation. The velocity field, pressure field, flow coefficient and adjustable ratio of spray regulator valve at different opening are analyzed. The results show that the main factors affecting the flow field distribution and the maximum flow velocity inside the valve body are the valve opening and the inlet and outlet pressure difference. There is a high speed area in the narrow channel area around the valve spool, which will decrease as the valve opening decreases. The pressure in the fluid domain changes rapidly from the inlet pressure to the outlet pressure at the narrow channel around the valve core. The adjustable ratio of the spray regulator valve is 72.9.
Experimental investigation on heat transfer performance of corrugated low finned tubes
Authors: Ren Bin , Si Jun , Tang Xiaoying , Lu Hongliang , Du Yannan , Ren Facai 
Published: April 2020

Abstract
With the outbreak of oil crisis, heat exchangers as the energy-saving devices have gained more and more attentions. The heat transfer enhancement techniques have been developed to the third generation. Corrugated low finned tube is a kind of helically corrugated tube with trapezoidal shape groove. In this paper, the performance of convective heat transfer inside corrugated low finned tubes was studied experimentally. The results showed that the heat transfer performance could be intensified compared with the smooth tube. The reason was that helical rib generated the secondary flow and longitudinal vortex, reducing the synergy angle between velocity vector and temperature gradient. Moreover, the effects of tube structural parameter and fluid Reynolds number were analyzed. Finally, all the experimental data were fitted as the function of Reynolds number, Prandtl number, tube pitch and rib height. The research results can provide a foundation for designing heat exchangers using this enhancement technique.
Comparison of the Contents of Typical Heavy Metals in Organic Carbons Associated with Calcium and Iron / AlBonds in Different Functional Areas in Beijing Urban Soil
Authors: Zhang Cuihua , Zhiming LIU , Min LUO , Zhang Junming , Shao Yang , Diandou XU , Lingling MA 
Published: April 2020

Abstract
Based on urban soils in Beijing, this paper studies the content of typical heavy metals (Cr, Mn, Ni, Cu, Zn, As, Cd, Pb) in calcium and iron-aluminum bond organic carbon in road and park areas in autumn and summer distributed. It was found that the content of heavy metals in the iron-aluminum bonded state was higher than that in the calcium-bonded state. The content is higher in summer than in autumn, and higher in road area than in park area.
Estimating the net ecosystem exchange for the Dayekou Guantan forest by integrating MODIS and Flux data
Authors: Shi Xiaoliang , Zhang Na , Wu Mengyue , Ding Hao , Chen Chong , Shang Yu 
Published: April 2020

AbstractEstimating net ecosystem carbon exchange (NEE) on regional and global scales is important for the carbon cycle and the greenhouse effect. The eddy covariance technique provides long-term continuous monitoring of site-specific NEE at the tower footprint scale. Remote sensing technology can continuously and systematically monitor multiple information of terrestrial ecosystem at regional scale, and it becomes an important tool to extend NEE to large scale combining with flux data. In present study, according to TG model, we established several new NEE models (using linear regress method based on single variable or multiple variables) that are suitable for Dayekou Guantan forest station with Moderate-resolution Imaging Sepctroradiometer (MODIS) products. Variables include enhanced vegetation index (EVI), land surface water index (LSWI) and land surface temperature (LST, including daytime LST and nighttime LST´). Compared with models based on single variable, models based on EVI, LSWI and LST have the best effect. Results showed that this method had good precision (2008) (R2and RMSE reached 0.8014 and 0.7364, respectively) and generally captured the expected seasonal patterns of NEE. We validated the model using independent flux (2009), which demonstrated this method performed well for estimating NEE (R2and RMSE reached 0.8618 and 0.5538, respectively). In addition, during the whole process, variables had obvious seasonal dynamical characteristics and closely related to NEE seasonal dynamics. However, uncertainty still existed in this method. In future research, more influencing factors should be selected to simulate NEE more accurately and extend the scope of research to a larger extent.
A Coordination Strategy between PV Generators and Storages based on Droop Control in AC Microgrids
Authors: Wang Liang , Wei Wei , Xia Yanghong 
Published: April 2020

Abstract
In an islanded AC microgrid, the coordination strategy between generations and storages is often designed to ensure the stability and economy of the system. In this article, for an AC microgrid dominated by photovoltaic (PV) generators, a strategy based on droop control is proposed to realize the generation-storage coordination. PV generators change their active and reactive power output by catching the changes in bus frequency and voltage, which can prevent storages from over-charged and make the bus voltage more stable. Storages are controlled by a droop algorithm based on state-of-charges (SOCs) to achieve SOCs balance among multiple storages. When the SOCs are too low, secondary loads (SLs) will be removed through a loads management, and the rest primary loads (PLs) will be powered entirely by PVs, which can prevent storages from over-discharged. Simulation based on Matlab successfully verifies the proposed coordination strategy.
Improved Topology of Quasi - Z - Source Inverter and Its Grid-Connected Control
Authors: Chen-yang Zhang , Tao Hou 
Published: April 2020

Abstract
In order to solve the problems of low voltage boost capability, high capacitance voltage stress, narrow voltage boost range and small gain of traditional z-source inverters, a new topology structure of quasi-Z source cascade H-bridge multilevel inverters is proposed. The simulation was verified by MATLAB/SIMULINK software and compared with other Z source topologies. The results show that the new topology makes up for the problems of insufficient voltage boost capacity and narrow voltage boost range of the traditional Z source inverter, and the output power is high when the inverter is connected to the grid.
PHC Content of the Sources Affecting the Whole Waterbody
Authors: Yang Dongfang , Su Chunhua , Wu Yunjie , Wang Ming , Zhu Sixi 
Published: April 2020

Abstract
Based on the survey data of Jiaozhou Bay in May, August and October 1992, the current content and horizontal distribution of PHC in the bottom waters of Jiaozhou Bay were studied. The results showed that in May, the content of PHC in the bottom water of Jiaozhou Bay ranged from 0.014 to 0.062mg/l, and the water of Jiaozhou Bay was slightly polluted by PHC. In August, the content of PHC in the bottom water of Jiaozhou Bay was 0.007-0.035mg/l. The foot water of Jiaozhou Cove was not contaminated by PHC. In October, the substance of PHC within the foot water of Jiaozhou Cove was 0.018-0.047mg/l. The foot water of Jiaozhou Inlet was not contaminated by PHC. All in all, in May, the foot waters of Jiaozhou Narrows was contaminated by PHC in May; in Admirable and October, the quality of the foot waters of Jiaozhou Cove come to the course I and course II seawater quality measures in China in terms of the PHC substance, which demonstrated that there was no pollution of PHC within the waters. In the surface waters of central Jiaozhou Bay in May, the central surface waters of the eastern Jiaozhou Bay and northwest Jiaozhou Bay in August and the surface waters of northeast Jiaozhou Bay and the bay mouth in October, the PHC content in the sources was relatively high. And this was also the case in the bottom water, which indicated that the PHC in the surface waters would descend rapidly to the bottom of the sea, and further indicated that there were high PHC content area in both surface waters and bottom waters. Considering these, the authors put forward the law about how the PHC from sources affects bottom water. They believe that high PHC content in surface water means high PHC content in a whole waterbody.
Effect of Connector on Smoke Temperature with Function of Pressing Capsules
Authors: Wang Hao , Yu Zhenhua , Zheng Han , Zhan Jianbo , Li Geng , Zhang Ying , Xie Jiao , Wang Xu , Yu Tingting , Yue Baoshan , Wang Tao , Yu Jiang , Li Liwei 
Published: April 2020

Abstract
In order to solve the shortcomings of single, fixed and irreplaceable cigarette capsules, the design of connector with function of pressing capsules which can replace and extrude multiple capsules at the same time was carried out, and the influence of this connector on smoke temperature was studied. ISO smoking model was applied to simulate the smoking process, and ANSYS software was used to fit the measured smoke. The geometric models of the smoke channel and the filter were established and meshed respectively. The pressure drop and temperature variation of the connector and the filter were simulated. The simulation results showed that CO and nicotine temperature were in transit. After passing the connector, the temperature drops sharply. When the filter rod reaches room temperature, it proves that the connector achieves the effect of reducing the smoke temperature.
Study on the Difference of Moisture-keeping Performance between Fresh-keeping Packaging and Conventional Packaging
Authors: Zhang Ying , Zhan Jianbo , Wang Hao , Zheng Han , Li Geng , Yu Zhenhua , Li Xiangzhen , Xie Jiao , Wang Xu , Jiao Jun , Yu Tingting , Yu Yao , Yue Baoshan 
Published: April 2020

Abstract
Packaging materials and packaging design have an important influence on the quality of cigarettes in the consumption process of unpacked cigarette packaging. In this paper, the effects of freshness-keeping packaging on moisture-keeping capacity, sensory quality, macula cigarette risk control after opening cigarette packaging were studied. The results showed: (1) After the opening of cigarette packages, the moisture content of cigarettes could be effectively maintained in fresh-keeping packages, while the moisture content of cigarettes in conventional packages would vary in a large range with time and environment (except equilibrium conditions). (2) In a high temperature test environment of 35 °C, the moisture content variation range of samples was as follows, paper-aluminium-plastic composite viscose hard freshness-keeping packaging > aluminium-plastic thermal package hard fresh-keeping packaging > paper-aluminium-plastic composite viscose soft freshness-keeping packaging. Differences in the type, material and process of freshness-keeping packaging may lead to differences in moisture retention performance, but the differences are not obvious.
Economic & Financial Feasibility Analysis of Tarakan Fishery Industrial Estate Masterplan
Authors: Fisu Amiruddin Akbar , Didiharyono D. , Bakhtiar  
Published: April 2020

Abstract
This study is an assessment towards financial feasibility of the planned development activities of the Fisheries Industry with a view to assess whether the Masterplan of Tarakan Fishery Industrial Estate is feasible to be developed in terms of economy and business. The method used for the feasibility assessment is conducted using the BCR (Benefit Cost Ratio), NPV (Net Present Value), and IRR (Internal Rate of Return). From the analysis result can be said that the industrial area planning is feasible economically and financially.