bluuebunny/crossref_metadata_2025_split huggingface dataset:
Parameters Tuning of Photovoltaic Power Generation System with Static Synchronous Compensator Based on Chaos Orthogonal Particle Swarm Optimization
Authors: He Weiguo , Zhang Xiangwen , Wei Wei , Shi Linjun 
Published: November 2019

Abstract
China is a country rich in solar energy resources, with good natural conditions for the utilization of solar energy. At present, the main application mode of photovoltaic power generation system is grid-connected photovoltaic power generation. In order to maintain the voltage stability of the common connection point (PCC), STATCOM is mainly added to the PCC of photovoltaic power station. It can be regarded that the photovoltaic system and STATCOM constitute a whole and are integrated into the grid, and the unified coordination and optimization of the overall control system becomes particularly important. In this paper, the parameter tuning strategy of PI controller for photovoltaic grid-connected system with STATCOM is studied. Taking the optimal overall performance of DC capacitor voltage and PCC point voltage of photovoltaic inverters as the optimization objective, chaotic orthogonal particle swarm optimization algorithm is used to optimize the parameters of PI controller of the system, and simulation is carried out under the condition of voltage variation to verify the effectiveness of the optimization strategy.
Graphene based non-noble metal catalyst for oxygen reduction reaction
Authors: Chuai Yunhan 
Published: November 2019

Abstract
The current noble-metal Pt based oxygen reduction reaction electrocatalysts suffer from high cost and poor operational durability. It is an urgent demand to developing alternative catalysts that are cost effective, readily available, and have the comparable catalytic activity than Pt for oxygen reduction reaction. Recently, graphene-based non-noble metal catalysts have been investigated and shown desirable activity and stability toward oxygen reduction reaction. Here, we offer a timely review paper to illustrate the recent progresses of graphene based electrocatalyst, including heteroatom doped graphene and graphene-inorganic nanoparticle composite. We hope this article can provide a guideline for rational design of highly active graphene-based non-noble metal catalysts toward oxygen reduction reaction.
Phase split of oil-water two phase flow at double-layer T-junctions pipes
Authors: Yang Lele , Wang Jing , Ma Yong , Zou Li 
Published: November 2019

Abstract
Offshore oil and gas production systems are in urgent need of a more compact, high-efficient oil-water separator. T-junction pipes are a potential solution to the need. Combining dynamic separation principle of T-junctions pipes with shallow pond theory, this paper presents a novel design of double-layer T-junctions pipes to realize high-efficient oil-water separation. The separation system consisted of upper and lower double-layer pipes that are connected by two vertical pipes. There exists an axially floating oil pipe along the top of the upper outer pipe. This design makes the Reynolds number decrease, which is beneficial to the formation of oil-water stratified flow. The slender seam at the bottom of inner pipe reduces the turbulence intensity, thus avoiding remixing oil with water. The influence of mixture velocity, oil content, water superficial velocity, oil superficial velocity, and inlet flow pattern on the phase split of oil-water two phase flow at double-layer T-junctions pipes has been investigated. Experimental results showed that the separation performance was less affected by the inlet oil content than by the inlet mixture velocity. Additionally, the phase split in the separation system was very sensitive to the inlet flow pattern. For separated flow pattern, oil-water can be well separated. But for dispersed flow pattern, the oil-water separation efficiency was low. Besides, the using of floating oil pipe can increase the system separation efficiency.
Estimation of Three-Dimensional Solubility Parameters of DM-700 Polyester Resin by Turbidity Titration
Authors: Liu Qiang , Shi Xiaoqin , Lu Yanqiu , Dong Liming 
Published: November 2019

Abstract
According to the method of turbidity titration and 63 cloud point data minimum volume closure ellipsoid fitting, the solubility parameter of polyester resin DM-700 was determined to be 22.84(MPa)1/2, and the three-dimensional solubility parameter was (δd=17.15 (MPa)1/2; δp=9.97(MPa)1/2; δH=11.32(MPa)1/2). This value is close to the result calculated by the group contribution method (22.68(MPa)1/2), which further proves that the method is accurate and reliable.
Analysis on Key Problems of Winter Operation in Alpine-cold Open-pit Mine
Authors: Bao Haiming 
Published: November 2019

Abstract
Through the analysis of winter operation problems in the alpine-cold open pit mine in Mengdong area, the technical and economic feasibility of adopting advanced peeling and winter peeling scheme is demonstrated. For the open-pit mining and transportation equipment in the alpine-cold region, the solutions for the scooping and sticking materials, the freezing of the brake circuit, and the sticking of the compartments are often proposed in winter operations. The anti-freeze system of the belt conveyor is composed of the cold resistant tape, the cleaning device, the antifreeze film, the heating device and the anti-freeze roller. Some safety production organization measures for blasting operations, mining operations, and semi-continuous systems in winter construction operations were proposed. It can effectively help the open pit mines in the alpine-cold regions to reduce equipment failures and ensure efficient operation in winter safety production.
Modeling pressure-sensitive effect of shale gas wells based on history matching
Authors: Li Zhanke , Shi Anfeng , Wang Xiaohong , Liu Zhifeng , Liu Zhifan 
Published: November 2019

AbstractBased on the measured data of gas production and backflow flux in Sichuan Province of China, pressure-sensitive effect is studied based on history matching in this article. When the shale gas development is on-going, the reservoir pressure declines and micro-fracture network may be partially closed in the stimulated reservoir volume (SRV). The closure of micro-fracture network not only leads to the decrease of absolute permeability, but also to the variation of relative permeability curve. The pressure-sensitive effect coefficient of relative permeability is introduced in this article to characterize this effect.
Research of Coupled Coordination Degree of Water Resources, Energy and Food System in Henan Province From 2008 to 2018
Authors: Yan Xin , Feng Yuanlin , Ye Jianing 
Published: November 2019

Abstract
With decrease of water resources and increase of energy demand in social life, uncertainty of food supply, which becomes severe, increase necessity of initiating a study of the degree of the coupled coordination among these three subsystems. Taking Henan Province as the research object, this paper calculates the coupled coordination degree in Henan Province from 2008 to 2018 by referring the coupling model. The results show that the degree of the coupled coordination of these three is divided by 2013, showing high coupling and extreme coupling state.
Analysis on the effect of prolonged injection of oil layer in the Gao 2 Formation of La 8-182 well area in Lamadian Oilfield
Authors: Li Dandan 
Published: November 2019

Abstract
At the end of 2012, the three types of oil layers completed the design of the polymer dosage. Since the water content did not rise and the concentration of the polymerization was low, the injection was prolonged from January of the 13th. The extension of the injection phase still has a strong injection capacity, and the water-bearing initial stage is slowly and slowly recovered. In this paper, the characteristics of water cuts in the extended injection phase of the test area are analyzed in combination with different water body water change laws and comprehensive adjustment methods, in order to optimize the three types of oil stratification. The design of the drive scheme provides a basis for accurately predicting the ultimate improvement of the recovery rate of the three types of oil layers.
Characteristics of lead smelting fume and its potential treatment technology
Authors: Wang Fang , Li Mingjun , Liu Yanli 
Published: November 2019

Abstract
Fine particles emitted from lead smelting furnaces contains a variety of heavy metals and oxidized condensates, which are characterized by complex composition and great harm. In this paper, dust samples from lead smelter were collected, and particle size analysis, composition analysis, phase analysis and specific resistance test were carried out in the laboratory. According to the properties of the lead dust, the experiment flow of electric coagulation was designed to verify the effect of using electric coagulation to condense fine particles in lead dust.
Study on Spill Risk Emergency Response Framework System in the Offshore Oil Development—Taking Chengdao oil field as an example
Authors: Ma Long , Zhang Liting , Meng Tao , Liu Dachuan 
Published: November 2019

Abstract
Taking Chengdao oil field as an example, the establishment of spill risk emergency response framework system was discussed combined with the development of offshore oil spill risk. Based on the identification source of spill risk and the impact on the marine environment, we attempted to analyze the problem from the six aspects, including construction of the oil spill surveillance and monitoring capacities, construction of the warning capacities, construction of the command & organization & coordination mechanism, construction of the site disposal capacities, construction of the emergency guarantee linkage mechanism and construction of the environmental damage assessment. And finally, some guide was hoped to provide in the aspects of promoting the safety of offshore oil production, reducing the accident rate and improving the performance of emergency response.
Study on Process Technology of Raw Material Water Pretreatment for Extracting Bromine
Authors: Zhang Yanan , Song Da , Yao Ying , Hao Xiaocui , Liu Wei , Li Tao , Zhang Qi 
Published: November 2019

Abstract
In view of the characteristics of different bromine raw materials such as seawater, desalinated concentrated seawater, and cultured salt brine, the raw material liquid is carried out by examining physical and chemical indicators such as temperature, turbidity, pH, Br-, suspended solids, COD, residual chlorine and chemical components. Purification, acidification, oxidation and other pretreatment processes are studied to form a pretreatment process suitable for different bromine feedstocks. Satisfy the influent water quality requirements of different bromine extraction methods, form a mature pretreatment process, provide important support for the related vertical issues in the field of bromine and the application of horizontal development projects such as feasibility study and design, and help to achieve desalination projects and The scientific combination of bromine engineering.
Study on Gas Control Technology of Large Diameter Directional Borehole
Authors: Xu Zunyu 
Published: November 2019

Abstract
With the development and extension of the mine, the mine gas, water, ground pressure and fire disasters further deteriorated, seriously affecting the safe and efficient production of the mine. Combining with the actual geological conditions, this paper analyses the feasibility of large diameter directional drilling construction on the roof of working face, calculates the construction horizon of directional drilling, and through field investigation, analyses the construction effect, extraction effect and cost comparison. Comprehensive comparison shows that large diameter directional drilling on roof can shorten the construction period of gas control engineering in working face, alleviate the situation of tense replacement of working face, reduce the amount of gas control roadway engineering, and save the cost of gas control engineering.
Experimental investigation and modelling of the gas jet in liquid cross flow
Authors: Dong Ping , Gong Shaofeng , Lu Bingju , Cheng Dong 
Published: November 2019

Abstract
In the present study, the development of a submerged gas jet subjected to liquid cross flow is experimentally and theoretically investigated to evaluate the effects of the cross flow. Experimentally, a submerged gas jet is injected into the liquid flow with different cross velocities (0.35 m/s, 0.7 m/s, 1.0 m/s, 1.5 m/s, 2.0 m/s) created by the newly designed experimental facility. The jet morphologies are captured by shadow photography and the images are processed to extract the parameters of the gas/liquid interface. An integral model including the jet entrainment is proposed to predict the jet evolution. It turns out that the integral model is able to predict the jet development accurately, and an overall good agreement was obtained between the theoretical and experimental results over a range of cross flow velocities.
Study on the Development Effect and Well Pattern Adaptability of Eastern Xing No.1 - No.2 Area
Authors: Wang Weixue , Xia Lianjing , Fan Hailin , Zhu Huanlai , Wei Huabin 
Published: November 2019

Abstract
The eastern part of Xing No.1 ∼ No.2 area is located in the northeast of Xingbei development area, Daqing oilfield. This block has the “double height” feature of high degree of production and high comprehensive water cut. Because the block has produced oil for a class of reservoirs for three times, the overall production degree is relatively high. In order to effectively improve the block water flooding development effect, this paper adopts several evaluation indexes to study the block development effect and well pattern adaptability.
Experimental analysis and logging evaluation of in-situ stress of mud shale reservoir-- Taking the deep shale gas reservoir of Longmaxi Formation in western Chongqing as an example
Authors: Mao Haiyan , Luo Tongtong , Lai Fuqiang , Zhang Guotong , Zhong Lulu 
Published: November 2019

Abstract
The complex structural conditions of marine shale in Western Chongqing area lead to the problems of insufficient understanding of pore structure, unclear direction of in-situ stress and poor fracturing effect, which lead to the difficulty of shale gas development. Based on the experimental study and logging data, the calculation model of in-situ stress is established. Finally, the influencing factors of in-situ stress are analyzed. The results show that the distribution of three-direction stress in the target interval is σH>σv>σh, and the experimental and logging results are consistent. As a whole, the in-situ stress tends to decrease with the increase of depth, with little fluctuation and good continuity. The fragility characteristics of the reservoir are relatively good, and it is easier to form various cracks that are widely developed.
Research on Deep Profile Control Technology of Water Flooding in Lamadian Oilfield
Authors: Liu Chunyan 
Published: November 2019

Abstract
After Daqing Lamadian Oilfield entered the stage of development of ultra-high water cut, the ineffective circulation of various oil layers was serious, which restricted the development benefit of oilfields. To this end, the research on deep profile control of water flooding is carried out, and the combination of polymer microsphere flexible diverting agent and bulk expanded particle slug is used to exert a slower blocking speed of polymer microspheres, and a certain resistance is established in the deep pores of the reservoir. To provide the main slug with aggregating residence time; to exert the superior advantage of flexible steering agent deformation and adhesion ability, to form a dynamic path-distributing mechanism in the deep cavity of the reservoir; to play the advantage of faster blocking speed of the bulk-expanding particles, to prevent the main section The plug was flushed by subsequent water injection. Through the multi-segment combination indoor core experiment, it is shown that the front section is filled with microspheres, the main section is filled with flexible agent, and the post-segment is filled with expanded particles, which can well block the invalid circulation part, improve the displacement effect and improve The recovery rate can reach 3.12 percentage points. On October 16, 2013, Daqing Lamadian Oilfield carried out a deep liquid flow steering test study on the 9-injection and 16-hole water-flooding group. The comprehensive water content of the affected oil wells decreased by 7.8 percentage points, and the cumulative oil increase was 5,435 tons. The rate is 2.7 percentage points, and the input-output ratio is 1:4.0, which has achieved better mine results.
Application of Well Test Interpretation in Oilfield Based on PDA Method in Tight Gas Reservoir
Authors: Du Peng 
Published: November 2019

Abstract
The reservoir characteristics of tight sandstone gas reservoirs are characterized by low porosity and low permeability, which brings difficulties to the conventional pressure recovery well test in oil fields. The lower porosity and permeability greatly extend the test time. Radial flow was not detected when the oil well was shut down for more than one month. The well test curve showed strong multi-solution characteristics and could not obtain accurate formation parameters. In this paper, based on the characteristics of tight gas reservoirs, the well test interpretation method (PDA method) is applied to the application of production data. A set of explanations for using the production data to explain tight gas wells and carrying out capacity evaluation and prediction are proposed. The interpretation of the production data of 1 is compared with the interpretation results of the pressure recovery test of the well. The two methods have good consistency, and the multiple interpretation methods can better reduce the multi-solution of the well test interpretation, and verify the PDA. The feasibility of the method applied on tight gas wells, and finally the correctness of the method was verified by the capacity prediction method.
Research on Optimized Penetration Ratio Fracturing Technology for Transition Zone
Authors: Zhang Chengling 
Published: November 2019

Abstract
The geological reserves of the Sazhong transition zone are 10046×104t, accounting for 12.5% of the Sazhong development zone. The effect of fracturing stimulation in this block is of great significance for the stable production of the Sazhong oilfield. The transition zone has the characteristics of low porosity, low permeability and low oil saturation. The crude oil has three high and one low characteristics: high viscosity, high wax content, high freezing point and low sulfur content. In the transition zone, due to poor physical properties of the oil layer, unbalanced formation pressure, high proportion of low-yield and low-efficiency wells, and energy replacement of thin oil layers, it is difficult to tap the potential of the production increase measures, and the effect of the measures is getting worse year by year. According to statistics, since the transition zone has 40 fractured oil wells since 2009, the fracturing process is general pressure and multi-crack, and the average pressure is 3 layers and 1 slit. The average average sand volume of single seam is 7.1m3, the average sand ratio is 25.7%, and the penetration ratio is only 14.1%. The average initial liquid increase after fracture is 20.4t, and the average initial daily oil increase is only 2.5t. Therefore, the study of transition zone fracturing technology can improve the overall development effect of the block, which is of great significance for the sustainable high yield and stable production of the Sazhong Oilfield.
Characteristics of Road Surface Temperature in Beijing Winter and its statistic forecasting models Based on the RMAPS Product
Authors: Dong Yan , Guo Wenli , Li Naijie , Zhang Hanbin , Min Jingjing 
Published: November 2019

Abstract
An analysis of the inter-diurnal variation of road surface temperature in the different weather conditions in Beijing winter is done, based on the data of the road stations from 2012 to 2017 and the outcomes from the numerical forecasting model, Rapid-refresh Multi-scale Analysis and Prediction System (RMAPS), which are constructed in this paper. First, the correlation coefficients between road surface temperature and the meteorological factors output by the RMPAS model are investigated. We used the stepwise regression model methods to build three kinds of types of statistical models for hourly road surface temperature in 24 h in winter. Then the best forecasting models are chosen to build for forecasting road minimum temperature in winter from A1027 road station selected. The results show that there exists a significant diurnal variation for the road surface temperature, suggesting that the road surface temperature is obviously different under the different kind of weather conditions. The road surface temperature is correlated with air temperature, atmospheric radiation, and sunshine duration. Compared to the type of statistical model with the only one factor for the road temperature of previous day, the type of regression model with meteorological elements of remarkable correlation inserted performs better in terms of the road surface temperature forecast accuracy by more than 25%, and the prediction error decreases by 1 °C.
Experimental Study on Influence of Dry Density on Soil-water Characteristic Curve of Hefei Expansive Soil
Authors: Chi Zecheng , Zeng Guanghui , Meng Zhaowei , Wu Song , Zhang Weipeng , Tian Ruogu 
Published: November 2019

Abstract
The soil-water characteristic curve is an important curve in the study of unsaturated soil mechanics. It plays an important role in improving theoretical analysis and numerical calculation in geotechnical engineering to find out the effect of initial dry density on SWCC. Based on the filter paper test, four soil-water characteristic curves of Hefei remolded expansive soil samples under different initial dry densities were determined. The influence of initial dry density on SWCC was systematically analyzed. The results show that: (1) In the w-s curve, the suction will increase with the decrease of moisture content, and SWCC will move to the upper right with the decrease of dry density. (2) In the ω-s curve, the influence of the dry density on SWCC decreases as the suction becomes larger. When the moisture content is less than 10%, the difference in dry density no longer affects the SWCC. (3) Part of the SWCC with moisture content below 10% can be measured only once, which has important guiding significance for improving the efficiency of SWCC test. (4) In the Sr-s curve, the suction will increases with the decrease of the saturation, and the increase of the dry density of the sample causes the move of SWCC to the upper right.
Study on Flow Field Characteristics in Deflecting Section of Shale Gas Horizontal Well
Authors: He Pei , Lu Zhaohui , Zhang Ye , Zhang Yi , Meng Chun 
Published: November 2019

Abstract
In order to study the characteristics of flow field at different deflecting sections of shale gas horizontal Wells, actual downhole string model is established to study the bottom-hole and annulus flow field characteristics by numerical simulation technology. The results show that the variation of deviation Angle has little influence on bottom hole and near bottom annulus flow field. When optimizing construction hydraulic parameters, the influence of the variation of inclined angle on bottom-hole flow field can be neglected. However, the distribution of annular velocity far away from the bottom hole is different, and the flow field characteristics of high inclined angle well are better than others, it is not easy to form cuttings bed during in construction. But more attention should be paid to problems of rock carrying in the low angle deflecting section of well. The research results can be used to guide the optimization of construction parameters and focus on the difficult problems in deflecting section of shale gas horizontal Wells.