bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Review of Fundamental Research on Hydraulic Fracturing of Glutenite Reservoirs in China
Authors: Bin Xie , Bin Zeng , Guodong Wu , Zhaozhong Yang , Jianlin Chen , Jigang Meng , Xiaogang Li 
Published: November 2019

Abstract
There are abundant tight oil and gas resources in glutenite reservoirs in China, and hydraulic fracturing is essential for developing this kind of resources. At present, the basic scientific problems involved in hydraulic fracturing of glutenite reservoirs, including simulation of fracture propagation, proppant transport and fracture conductivity, are not systematically clarified yet. The deficiencies of existing research ideas and methods are summarized, then suggested solutions and development prospects are proposed. The analysis shows that for the fracture propagation experiment, the establishment of a scalable glutenite sample preparation method and the experimental parameter conversion method is an urgent problem to be solved. The particle flow code (PFC) method has advantages in simulating the fracture propagation in microscopic scale. However, the simulation of fracture propagation in oilfield scale faces the problem of cross-scale calculation, so establishing a fast and effective cross-scale simulation method is very important. For the proppant transport experiment, the key is to develop plates with unidirectional filtration and different roughness to simulate the hydraulic fracture surface of glutenite reservoirs. The CFD-DEM coupling method to simulate the proppant transport has a good prospect, but it is necessary to consider the special properties of the glutenite reservoirs, and improve the mathematical model and explore corresponding solution method. The key to the experimental research of the fracture conductivity is to make samples that meet the size and shape requirements. Downhole drilled core, man-made rock and 3D printing technique can be adopted for sample procession. For computer simulation of conductivity prediction, combining PFC with CFD method to predict the conductivity of glutenite is an important exploration direction in the future.
Study on the factors affecting the spatial distribution of heavy metal elements
Authors: Chen Fangyuan , Chen Xinmin , Zhu Fan , Sun Qi 
Published: November 2019

Abstract
The contents of As, Cr, Cu, Zn and Pb in soils of the central urban area of Nanjing Jiangbei New area are analyzed by interpolation analysis. The effects of pH value, soil texture and heavy metal species on the contents of heavy metals are studied. The results show that the contents of heavy metals in the study area are more than 1.5 to 6.3 times of the soil background value in Jiangsu Province. The content of heavy metal Cr is 31.92∼95.38 mg/kg, and some areas have already exceeded the control value of the second type of construction land in China, 78 mg/kg. The pH value is inversely proportional to the total heavy metal content, which indicates that it is more difficult to enrich heavy metal ions in alkaline environment. The soil texture in this area is dominated by sand grains, and the spatial distribution of sand grain content decreases from southwest to northeast. The clay content is positively correlated with the heavy metal content except Zn. The main forms of the five kinds of heavy metals in soil are residues, reaching 73.86%∼88.15%, and with the increase of heavy metals content in soil, the proportion of residual decreases.
Syntheses of Biodegradable Polylactides Catalyzed by Aluminum Complexes bearing Phenanthrene Derivatives for Polymerization of Lactides
Authors: Li Dongni , Gao Bo , Li Yanhui , Duan Qian 
Published: November 2019

Abstract
A methylaluminum Schiff base compound 1 bearing phenanthrene derivatives was made and used in the ROP of LA. Compound 1 was characterized by NMR and elemental analysis. Compound 1 with isopropyl alcohol exhibited good activity towards the polymerization experiment of LA. The ROP is in a coordination-insertion mechanism.
Lysimachia christinae polysaccharide mediated facile synthesis of gold-silver alloy nanoparticles for catalytic reduction of 4-nitrophenol
Authors: Liang Miao , Zhang Guo , He Yuan , Hou Pei , Li Meng , Lv Bin 
Published: November 2019

Abstract
We report here an environmentally benign and facile approach for the synthesis of gold-silver alloy nanoparticles. This approach involves the co-reduction of HAuCl4 and AgNO3 by employing Lysimachia christinae polysaccharide as both reductant and stabilizer without the introduction of any other surfactant. The formed gold-silver alloy nanoparticles exhibited relatively narrow distribution and good stability. Generation of the gold-silver alloy nanoparticles were observed by UV-vis spectroscopy, transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The reaction of 4-nitrophenol reduction was employed to evaluate the catalytic property of gold-silver alloy nanoparticles, and it was found that the alloy nanoparticles χ
Au = 0.5) have better catalytic performance than the corresponding monometallic nanoparticles.
Research on Substation Comprehensive Investment Demand Evaluation Model under the Background of Electricity Reform
Authors: Yang Zhilong , Liu Yamin , Xu Qinghua , Shi Xiaokun , Liu Hang 
Published: November 2019

Abstract
Based on the background of electricity transmission and distribution price reform, this paper focuses on the substation assets, through the influence analysis of reform policies to the power grid company operation and management, aimed at the high quality development of the company and power grid, to establish the substation comprehensive investment demand evaluation index system, specify the index calculation methods and evaluation principles, construct the substation comprehensive investment demand evaluation model, collect the actual data of a power grid company’s substations, measure and calculate, and put forward the substation investment and construction advice according to the results of the measurement, to assist the company for investment decision making.
Dynamic Analysis of Gearbox Transmission System Based on ADAMS Traction Locomotive
Authors: Lei Lei , Sui Yunan , Tianmin Guan 
Published: November 2019

Abstract
In order to verify the rationality of the design of the gearbox transmission system of the traction locomotive, based on the ADAMS software, the 3D model of the gearbox transmission system is established in CREO 3.0, and the dynamic model of the gearbox transmission system is built into the ADAMS for simulation. Analysis, the dynamic meshing force between the gears, the force of the bearing on the box, etc., and the obtained simulation values are compared with the theoretical values. The results show that the results obtained by ADAMS simulation fluctuate around the theoretical value, which verifies the reasonable design of the traction locomotive gearbox transmission system.
Stepwise Approach in Lagged Variables Time Series Modeling: A Simple Illustration
Authors: Yanti Yusma , Rahardiantoro Septian 
Published: November 2019

Abstract
Modeling approach in time series data commonly used to forecast the response variable based on the pattern of the predictor variables. The complicated cases occurred when in the model need the lagged variables from these variables. It can increase the number of predictor variables in the model. In this research, the increasing of number of predictor handled by the stepwise method in the regression analysis approach. All possible lag from the variables generated before the stepwise take action to choose the appropriate variables in the model. The illustration in this research based on the advertising-sales relationship of 36 consecutive months. Result of the model can determine the significance predictor variables in the model, and also can give the appropriate goodness of fit criteria for forecasting.
Book Embeddings of Infinite Sequences of Extended Periodic Regular Graphs
Authors: Pinontoan Benny , Titaley Jullia 
Published: November 2019

Abstract
A graph is extended periodic if it can be made up by gluing identical pieces together with a graph which is isomorphic to or subgraph of that piece, in a circular fashion. We consider an infinite sequence Hn
of extended periodic 4-regular graphs and an infinite sequence Mn
of extended periodic 5-regular graphs. A book is a collection of half-planes called pages, all having a common boundary called the spine. A book embedding of a graph G is to put the vertices of G on the spine and each edge of G is contained in one page. The minimum pages needed to embed a graph G into a book is called pagenumber of G. We determine the pagenumbers of Hn
and Mn
to be three.
A New 4-D Hyperchaotic System with Four-Scroll Hidden Attractor, Its Properties and Bifurcation Analysis
Authors: Dolvis L G , Vaidyanathan S , Jacques K , Sambas A , Sukono  , Mamat M 
Published: November 2019

Abstract
This paper announces a new four-dimensional hyperchaotic system with a four-scroll attractor and discusses its dynamic properties such as Lyapunov exponents, phase portraits, Kaplan-Yorke dimension and equilibrium points. Our calculations show that the new hyperchaotic system has no equilibrium point and hence it exhibits hidden attractor. Our new hyperchaotic system has three nonlinearities in total. A detailed bifurcation analysis has been presented for the new hyperchaotic system with four-scroll hidden attractor. Specifically, we discussed bifurcation analysis such as route to four-scroll hyperchaos, coexisting bifurcation, multistability, two parameter Lyapunov exponents and antimonotonicity.
The assessment of Danau Kota Lake water quality using chemometrics approach
Authors: Juahir Hafizan , Ghazali Adiana , Ismail Azimah , Mohamad Mahadzirah , Hamzah Firdaus Mohamad , Sudianto Sunardi , Mohd Lasim Mohd Lokman , Shahriz Mohamed Aidi 
Published: November 2019

Abstract
Danau Kota Lake is public attraction area, located in the middle area of Kuala Lumpur. An excessive count of visitors visiting the lake has weakening the lake water quality. The present study was driven to evaluate the lake water quality for environmental conservation. Some water quality and metals data were in-situ measured whereas some were collected for laboratory analysis. BOD, OG, AN and TC are identified as major pollutants towards Danau Kota Lake water quality. The decreasing concentration of DO and increasing of turbidity towards the deeper lake water column has been deteriorated the living water communities and caused hypoxic condition in the bottom water of Danau Kota Lake. Spatial variation of metals in the lake sediment has evidenced the accumulation of metals in the middle part of the lake area due to the sedimentation process. Based on PCA, the possible pollutant sources for this lake are the organic pollutants from the wastewater and industrial pollutants as well as the abundance of suspended algae. Since the water quality of Danau Kota Lake has marked some issues, the present study may assist Kuala Lumpur City Council to prevail the lake water quality challenge promptly by cost saving and in efficient manner.
Study on the properties of improved adsorbent of nitrogen oxides
Authors: Wang Fang , Li Mingjun 
Published: November 2019

Abstract
In this paper, sodium bentonite, zeolite and other natural minerals are used to make adsorption materials, and physical and chemical adsorption are combined to improve the adsorption efficiency of NOx. The adsorbents were modified by loading additives with high catalytic capacity for NO. Results showed that the improved adsorbent has high adsorption to NO, making NO easy to be oxidized into NO2 by the loaded metal oxides, thus NOx can be highly adsorbed and purified at room temperature.
Microstructure and Mechanical Properties of Selective Laser Melting 0Cr18Ni9 Stainless Steel
Authors: Huang Shuai , Guo Shaoqing , Zhou Biao , Liu Wei , Li Neng , Zhang Guohui , Chen Bingqing , Zhang Xuejun 
Published: November 2019

Abstract
The 0Cr18Ni9 samples were prepared by laser selective melting technique, and the effects of different power and scanning speed on the microstructure evolution were observed. Through the observation of the microstructure and the analysis of the densification test results, the optimum process parameter was 280W, 960mm/s. The tensile strength (678MPa) and yield strength (554MPa) of the transverse tensile specimens formed under this condition are higher than that of the longitudinal specimens. However, the longitudinal specimen is more plastic than the transverse specimen.
Study on Leaching Mechanism and Safety Evaluation of Lead and Zinc Contaminated Soil
Authors: Zhang Hua 
Published: November 2019

Abstract
Taking the tailing pond of the Qiaokou lead-zinc mine in Hunan province as the research object, the lead-zinc-contaminated soil was leached by citric acid, and the phase characteristics of the contaminated soil before and after leaching were analyzed by SEM-EDS, combined with BCR. The continuous extraction method was used to study the occurrence of four kinds of heavy metals in contaminated soil, and then analyze the potential migration and transformation ability and migration law to evaluate the potential hazards of heavy metals to the surrounding environment, and to repair the lead and zinc tailings pond. Provide theoretical basis and technical support with governance.
Terminal Vapor Recovery of Oil Tankers in China: Current Issues and Promotion Strategies
Authors: Li Yue , Cheng Jinxiang , Mao Ning , Xu Honglei , Zheng Chaohui , Li Mingjun 
Published: November 2019

Abstract
Terminal vapor recovery, a widely-applied technology for emission control on vapors of gasoline and other fuels at terminals, can effectively reduce the VOCs (volatile organic compounds) during the cargo loading procedure of oil tankers. This paper aims to provide a systematic analysis of the current situation and main issues of vapor recovery technology, proposals of basic principles, general strategies and specific tasks and programs for the promotion of the technology, as well as a reference for decision-making on the further development of terminal vapor recovery system in China.
Experimental Studies of Heat Transfer and Corrosion Resistance of Ni-W-P Coating under Supercritical Water
Authors: Ren L , Cheng Y H , Han Z T , Yang J Y , Tian X H 
Published: November 2019

Abstract
As the post-processing method of equipment and tubes is seldom used in the field of super-critical water (SCW), as well as the high cost and low heat transfer performance of some of the materials, more up-to-date methods were developed to inhibit oxidation of SCW. In this work, the ternary Ni-W-P coating was deposited on the sample surface. Structure and composition of ternary Ni-W-P coating were profoundly analyzed with scanning electron microscopy (SEM), energy disperse spectroscopy (EDS) and X-ray diffraction (XRD). Additionally, thermal conductivity meter was specially employed to study the performance of heat transfer behaviour, by means of heat-resistance method. After oxidation of SCW, amorphous Ni-W-P coating crystallizes to some extent and oxidation resistance of coating can be convincing. Nevertheless, the diffusion of metal cations and the growth of oxides are the vital factors inhibiting the oxidation of SCW. Furthermore, the thermal conductivity of ternary Ni-W-P coating decreases with the increase of tungsten content and the coating unquestionably shows better heat transfer performance in the field of nuclear waste disposal and transport.
Microstructure and properties of Cr12MoV die steel by laser quenching with different power
Authors: Yu Liu , Yuanpeng Tian , Hui Zhang , Haijing Zhang , Yang Li 
Published: November 2019

Abstract
In this paper, laser quenching on the surface of Cr12MoV cold-work die steel was carried out by CO2 laser. The laser scanning speed was 800mm/min, and the laser powers were 1200W, 1400W, 1600W and 1800W respectively. Thickness, microstructure, hardness, XRD, friction and wear properties of the quenched layer were investigated after laser quenching with different power. The results show that the thickness and martensite content in quenched layer increase gradually with the increase of laser power. The hardness of quenched layers have an increase firstly and a later decrease along with laser power. When the laser power is 1600W, the maximum hardness is 662.9HV. When the power is 1800W, microfusion appears on the surface, and the hardness of the quenching layer decreases. The wear volume of the sample first rises and then falls along with laser power. The minimum wear volume is 0.09mm3 at 1600W, and the wear volume is reduced by 92% of the original sample. Therefore, scanning speed of 800mm/min and laser power of 1600W can get the best microstructure and properties.
Preparation and properties of polycarboxylate superplasticizer with high water-retaining property
Authors: Li Xianghe , Hou Huanhuan , Wen Qingru , Guan Mengqin , Guo Xinqi 
Published: November 2019

Abstract
In this paper, ethyl glucose (Glc), 2-amino-4-methyl-5-phospho-3-pentenoate (AMEPA) and p-toluene sulfonic acid (PTS) were esterified, and the esterified products were polymerized with acrylic acid (AA), 4-hydroxybutylvinyl polyoxyethylene ether (VPEG), initiator (APS) and chain transfer agent (ME) in free radical solution to prepare polycarboxylate superplasticizer with high water retention. The performance test results show that the product has high water-reducing ratio and better workability when applied to concrete, which can effectively retain the moisture in concrete and ensure the stability of concrete fluidity.
Study on Mechanical Properties of Composites with Regular Distribution of Single Layer Ellipsoid Particles
Authors: Chen Keying , Zeng Liangcai , Chai Yufeng , Chen Juan 
Published: November 2019

Abstract
The impact of the size distribution of the reinforced particles on the mechanical properties of composite materials is studied, according to the corresponding parameters, the finite element model of the composites on the model of Al based SiC composites is established. With the method of finite element simulation, the surface displacement and stress distribution of particle reinforced composites whose surface is pressed by a line uniformly load is solved, the effects of reinforced particles buried depth, length to diameter ratio, the young’s modulus ratio of matrix and particles, and rotation angle on the mechanical properties of composites are also analyzed The article outlines concrete influences of the structure parameters and spatial distribution parameters of particles which distribute in the composites on the surface displacement and stress distribution of the composites.
Study on friction characteristics of micro-arc oxidation modification layer of titanium alloy surface in seawater environment
Authors: Xingsheng Lao , Xufeng Zhao , Yong Liu , Chunhui Dai , Wei Wang 
Published: November 2019

Abstract
In order to study the effect of surface microarc oxidation modification on the comprehensive properties of titanium alloys in seawater environment, the metallographic structure of titanium alloy Microarc oxidation modified surface layer and the basic physical parameters such as hardness, thickness and roughness were measured, and the PTFE, filled with 15% glass fiber +5% were filled with 25% fiberglass. The PTFE of graphite and the PTFE filled with 60% tin bronze were tested for friction by friction pair materials, and the wear amount and roughness of titanium alloy and Microarc oxidation modified surface layer were test in simulated sea water as 3.5% Nacl solution, and the results showed that the surface modification of titanium alloy by Microarc oxidation could significantly improve its hardness. The surface roughness can reach 3.2μm, and the friction coefficient of different matching pairs is small, while the surface wear of microarc oxidation modification is less than that of substrate wear.
Synthesis and corrosion Resistance of silane coupling agent modified graphene oxide/waterborne polyurethane
Authors: Shu S S , Wu L , Liu J M , Liu Y , Hu Y , Xu J H , Wang L 
Published: November 2019

Abstract
In this paper, graphene oxide (GO) is used as a matrix, and it is modified with a silane coupling agent (KH550) to prepare modified GO. The GO/waterborne polyurethane composite coatings with different contents are prepared by chemical grafting, and their structural characterization tests are carried out. The results show that the silane coupling agent can effectively modify GO, and the surface of the modified GO has more oxygen-containing functional groups. The added modified GO can effectively enhance the corrosion resistance of the coating, and the corrosion resistance of the composite coating was optimal when the mass fraction is 0.03%, and 5% corrosion occurs after 48 h, and the total corrosion time reaches 120h.
Preparation and molten salt corrosion behaviors of TiO2/Al2O3/Incone1625 composite coatings on the surface of Q235 alloy at 900 °C
Authors: Chen Tuchun , Bai Lingyun , Wen Kunkun 
Published: November 2019

Abstract
Sol-gel method combined with plasma surfacing was used to prepare TiO2/Al2O3/Incone1625 composite coatings on the surface of Q235 alloys. To investigate the corrosion resistance of this coatings, samples with Incone1625 single coating and TiO2/Al2O3/Incone1625 composite coating were corroded with NaCl and Na2SO4 salts with the weight ration of 1:1at 900 °C in air for 24 h. Molten salt corrosion thermodynamic results show the composite coatings caused lower oxidation weight gain than the sample with single coating. Combination of XRD and SEM results illustrates that the surface and cross-sectional morphology were composed of an outermost loose and cracked NiO and iron oxides layer for the Incone1625 coated sample. For the composite coating sample, the oxide film was composed of more compact NiO and Cr2O3 as the main layer. There were inner oxidation regions for both samples, but region for sample with composite coating was more thinner than that for sample with single coating. This work shows that TiO2/Al2O3/Incone1625 composite coating improves the molten salt corrosion resistance properties of the Q235 alloy at 900 °C by promoting the formation of the protective Cr2O3 film on the sample surface.
Optimization and transformation of 300MV units steel ball coal mill Pulverizing System
Authors: Wang Wenlan , Bai Xionghuai , Liang Wanku 
Published: November 2019

Abstract
Comprehensive treatment,we should have a test on the 300 MV unit steel ball coal mill pulverizing system.At the same time,analyze the main operating parameters before modification.Transform the pulverizing system and optimize the run mode of the pulverizing system by comprehensive treatment.So we can control the pulverizing unit consumption under 30KWh/t.It makes the pulverizing system in the best state.Then we can ensure its economic and safe operation.