bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on High Efficiency IO Control Technology of Seismic Data Based on Data Segmentation
Authors: Liu Liting , Zhang Xi , Chen Yu 
Published: February 2020

Abstract
With the development of geophysical prospecting technology, seismic operation processing is terabytes of data in actual production. A seismic operation processing time can be as long as ten days. In order to complete these processing tasks in as short a time as possible, efficient use of node resources is needed. Therefore, it is necessary to segment and decouple the input data in order to improve the computational efficiency when carrying out such large amount of data, intensive calculation and long running time operations. IO control system can decompose such jobs into several sub-jobs for parallel processing, so as to shorten the running time, improve the efficiency of seismic data processing and enhance the computing performance of cluster system.
Study on Optimization Application of Iron Ion Stabilizer in the Polymer Injection Process of Offshore Oilfield
Authors: Zhu Shanshan , Zhu Shijie , Zhang Hong , Liu Changlong , Shi Leiting , Ye Zhongbin 
Published: February 2020

Abstract
A large amount of Fe2+/Fe3+ ions are produced by corrosion and fouling in the high-pressure polymer injection process of offshore platforms, which will affect the viscosity of the polymer solution, and is difficult to effectively control by the addition of stabilizers in the curing tank. In order to solve this problem, this paper has carried out related research and the results show that: 1) Fe2+ mainly generates free radicals (·OH) by oxidation catalysis, to destroy long chains of polymer molecules, causing irreversible fragment breakage, resulting in a significant decrease in polymer viscosity; 2) Fe3+ mainly binds to hydroxyl groups, resulting in flocculation and viscosity reduction of polymers; 3) Stabilizers with complexation can effectively control Fe3+ to form water-soluble complexes, while excess stabilizers increase salt content and reduce polymer viscosity by electrostatic shielding effect. In order to effectively control the influence of Fe2+/Fe3+ and the stabilizer on the polymer solution in the production process, an appropriate amount of complex stabilizer should be added to the diluent inlet of the mixture of the polymer mother liquor and the diluent.
Laboratory Study on Active Aging Oil Plugging Agent
Authors: Liu Shasha , Zhang Yanru , Yan Haijun , Xie Gang , Lu Cheng , Jing Jizhe , Wei Aijun , Qin Zhonghai , Shi Lei 
Published: February 2020

Abstract
Aging oil refers to the stable emulsion of crude oil formed by emulsification that cannot be treated by conventional surfactants due to the influence of bacteria, chemical agents, self asphaltene and colloid in the process of crude oil exploitation, transportation and processing. There is a large amount of aging oil stored in the joint station of the production plant in Huabei oilfield, which not only causes certain harm to the gathering and transportation system, but also brings heavy environmental burden to the oilfield. In this study, on the basis of physical property analysis of aging oil samples, the properties of aging oil and emulsifying resin plugging agent were compared. And the water plugging principle of emulsion resin was used for reference. The system of active aging oil plugging agent is constructed by experiment. Core displacement experimental evaluation shows that active aging oil core water plugging rate was 98%, the breakthrough pressure gradient was 26 MPa.m−1, and it has good plugging effect.
Study on Yield Mechanical Properties of High Availability Materials before and after Aging for Intelligent Measurement Equipment
Authors: Zheng Angang , Yuan Xiangyu , Wang Yifan , Shang Huaiying , Liu Yan , Zhang Wulei 
Published: February 2020

Abstract
One of the key technical research points in the field of smart grid measurement is to make a breakthrough in the detection and evaluation of high availability materials in intelligent measurement equipment. The comprehensive cross-action of multi-environmental stress brings a lot of data, how to find the key parameters in it, and how to analyze the complex environment into the characteristic combination of multiple single environmental factors, and the mathematical model of nonlinear evolution and service life of material aging based on the characteristic expression of the combination, all of the above are the key points and difficulties of the research. On the basis of the service life model, the research on differential protection measures and the study of life evaluation technology for smart grid measurement equipment can enable the equipment to realize wide-area application and high availability under more harsh conditions, which is one of the key points to improve the quality control in NQI system.
Application of Point-by-Point Vector Synthesis in Walkaway VSP Logging Data Processing
Authors: Liu Fei , Qin Li , Tang Jian , Cheng Lili 
Published: February 2020

Abstract
At present, it is necessary to use Walkaway VSP logging imaging data to drill horizontal shale gas wells in exploration areas lacking three-dimensional seismic data. Walkaway VSP logging imaging profile can delineate the formation structure around wells, obtain detailed information of dip, inclination and fault around wells, and guide the trajectory design of horizontal wells. But VSP logging is richer and more complex than conventional seismic data. The precondition of up-going wave imaging is to separate up-going P-wave or converted S-wave from complex wave field. Nowadays, most vector synthesis techniques can not completely separate up-going P-wave from up-going converted wave, which affects the accuracy of final imaging results. In order to achieve the best wave field separation effect of VSP logging data, the point-by-point vector synthesis technique is adopted. Firstly, the directional rotation synthesis of horizontal components is carried out according to the maximum energy criterion. Then the rotational synthesis of horizontal and vertical components uses ray tracing based on velocity model to estimate the polarization angle of time-varying upward reflected P-wave or converted wave. The method of “velocity fine-tuning scanning” is applied to search for the best synthesis angle, and the point-by-point vector synthesis is carried out by calculating the time-varying polarization angle. Finally, the best separation effect data are selected as the final vector synthesis result. This technique solves the problem that conventional vector synthesis cannot completely separate up-going P-wave from up-going converted S-wave. Upward P-waves acquired after separation has clear characteristics, more continuous phase axis and good fidelity processing effect, which lays a solid foundation for fine imaging of target formation in the study area and has become an indispensable key supporting technology for optimizing the trajectory of horizontal wells in shale gas development in Sichuan Basin.
Thermal Properties of Poly(L-lactide) Containing Succinic Dihydrazide Derivative
Authors: Zhao Lisha , Cai Yanhua 
Published: February 2020

Abstract
The slow crystallization speed is one of the most important factors restricting the development of Poly(L-lactide) (PLLA). In this paper, a succinic dihydrazide derivative BPASD was prepared to study its influence on the PLLA’s non-isothermal crystallization behavior and thermal decomposition behavior. A comparative study on the melt-crystallization of the PLLA/BPASD and pure PLLA showed that the BPASD could promote the melt-crystallization of PLLA in cooling, and a larger amount of BPASD exhibited the better nucleation effect for PLLA. However, the cold-crystallization peak moved to the lower temperature with increasing of BPASD loading. Additionally, the cooling rate and the heating rate were two improtant factors to the crystallization process of PLLA. Thermal stability measurements showed that the pure PLLA and all PLLA/BPASD samples have only one thermal decomposition profile, but the presence of BPASD reduced the thermal stability of PLLA.
Evaluation and Optimization of Corrosion Inhibitor System
Authors: Yun Liu , Qingzhen Du , Wei Xiong , Yanfang Gao , Fang Shang , Wei Zhang , Gangliang Li 
Published: February 2020

Abstract
By combining two methods of weightlessness and electrochemistry, the corrosion inhibitors have been selected and optimized. The orthogonal experiment has been carried out to optimize the inhibitor’s performance. The range analysis results indicated that corrosion inhibition performance of optimized corrosion inhibitor (HZ-1) has been improved remarkably. The corrosion inhibition rate can reach 94.66% with lower corrosion current density. The optimum concentration of HZ-1 is 90 mg/L and working temperature is 80∼100°C. Its site application shows that the inhibitor also has remarkable corrosion inhibition effect, the concentration of iron ions is decreases, and the period of pumping wells has been prolonged significantly.
Study on Electromagnetic Wave Absorption performance of Dendritic-like Co
Authors: Yang Fuli , Hou Xingzhe , Wang Lirui , Li Youjiang , Zhang Xuecong , Yu Miao 
Published: February 2020

Abstract
Dendritic-like Co particles consisting of leaf-shaped nano-units were successfully synthesized by chemical reduction method. The absorbing particles have abundant multi-stage branches. Since the crystal structure, size and special morphology have an important influence on the microwave absorption performance, the X-ray diffractometer, scanning electron microscope, vibration sample magnetic measurement and vector network analysis are used to characterize the dendritic Co. Absorbing mechanism was analyzed systematically. The nano-sized, multi-stage branches, porous structures and rough surfaces of the prepared particles all contribute to the penetration, scattering and attenuation of EM waves. Hence the composite, in the test band, especially in the S-band (2-4 GHz), presents excellent microwave absorption properties.
Preparation of Reduced Graphene Oxide/Magnetic Metal Composites and Its Electromagnetic Wave Absorption Properties
Authors: Yang Fuli , Hou Xingzhe , Wang Lirui , Li Youjiang , Yu Miao 
Published: February 2020

Abstract
Reduced graphene oxide (RGO) was successfully prepared by reducing graphene oxide (GO) by zinc powder in this paper. Then the reduced graphene oxide (RGO) was combined with Fe and Ni nanoparticles to form RGO/Fe and RGO/Ni composite absorbing materials. The morphology, chemical composition, magnetic properties and electromagnetic parameters of RGO/Fe and RGO/Ni were characterized by means of scanning electron microscopy(SEM), X-ray diffraction(XRD), vibrating sample magnetometry (VSM) and vector network analysis (VNA) to study absorbing mechanism of the as-prepared RGO/magnetic-metal composites, including the effect of magnetic particles Fe and Ni on the absorbing properties. The results showed that in the frequency range of 2-18 GHz, the effective absorption band of RGO/Fe was wider than that of RGO/Ni, with larger reflection loss.
Preparation of Rich Hydrocarbon Fuels by Cornus Wisoniana Crude Oil Catalytic Coupling
Authors: Lai Pengying , Li Jilie , Xiao Zhihong , Miu Yifu , Zhang Aihua 
Published: February 2020

Abstract
Cornus wisonian is a woody energy plant unique to the southern region, the fruit oil can be used as the important raw materials in catalytic cracking. This experiment studied the catalytic cracking decarboxylation reaction of Cornus wisoniana oil. Through experiments, CaO / KF made by ourselves was proved to have good catalytic effect, gas production rate is lower than 12.0%, the by-product of the bottom of the kettle residue is controled under 5.0%, the yield of liquid fuel oil products is at 83.0% or more. Because of high acid value, pyrolysis oil can’t be directly burned. In this study, p-toluenesulfonic acid was used as a catalyst for alcohol esterification. Under the Optimization condition, acid value is lower than 1.0 mg KOH/g. Then alcohol esterification was used to reducing acid of cracking bio-fuel products and p-Methylbenzene sulfonic acid as catalyst. After reducing the acid, this kind of fuel is closer than traditional fossil fuels, able to alternative to diesel, and to achieve energy conservation.
An Investigation of Hydraulic-Fracturing Applied to Marine Gas Hydrate Reservoirs
Authors: Liu Yanchang , Sun Minggang , Wang Gongtao , Wang Qing , Zhao Lian 
Published: February 2020

Abstract
Engineers have been struggling to harvest natural gas from the marine hydrates through drilling wells in the past two decades. The harvesting process has not been successful due to engineering problems such as wellbore collapse and sand production. This study proposes to use frac-packing method to address the wellbore collapse and sand production issues to break through the bottleneck of commercial production of natural gas from marine gas hydrates. An analytical model was developed to describe sequential initiation and simultaneous propagation of multiple vertical fractures in horizontal wells for frac-packing gas hydrate reservoirs. Result of sensitivity analyses with the models indicates that to frac-pack horizontal gas hydrate wells for solid-production control, increasing injection rate and flow behavior index of fracturing fluid will create more friction and thus more resistance to flow in large fractures, promoting the creation of more short fractures, and thus larger treated reservoir volume for higher gas production rate and gas recovery.
Study on the optimization of timing for horizontal well re-fracturing in tight oil reservoir -- A case study of Baikouquan Formation in North Mahu Oilfield, Junggar Basin, Western China
Authors: Sidike Alimujiang , Bin Xie , Bin Zeng , Guodong Wu , Zhaozhong Yang , Jianlin Chen , Jigang Meng , Bo Huang , Xiaogang Li 
Published: February 2020

Abstract
There are abundant tight oil resources in China, and “horizontal well + volume fracturing” technology is the one of the main means to develop such reservoirs. The production of tight oil reservoir declines generally rapidly after the initial fracturing, therefore it is necessary to be conducted re-fracturing operation to restore the oil productivity. The determination of the best time of re-fracturing is an important factor to ensure the re-fracturing effect. In this paper, a mathematical model of oil-water phase seepage was established by applying the principle of finite difference method (FDM). A unified grid system was adopted for the division of the matrix and fractures, and the equations were solved by the IMPES method. The reliability of the proposed seepage model gets verified by the historical matching based on the field production data. The oil production after re-fracturing at different moments of time after initial fracturing was predicted. The simulations show that more cumulative oil production can be obtained if re-fracturing is implemented after the fourth year of initial fracturing. During the period after the 4th year of the initial fracturing, the earlier the re-fracturing is implemented, the more the cumulative oil production will be harvested. Considering the cost of re-fracturing operation, the economic benefits of re-fracturing after the sixth year of initial fracturing were evaluated. The results show that the cost can be recovered about one year after the re-fracturing, the net present value (NPV) after four years of re-fracturing reaches 69.95 million yuan, with an output-input ratio of 5.3.
Impact analysis and risk assessment of supply and demand bilateral randomness on power system
Authors: Liu Dunnan , Li Hua , Rui Ge , Xu Xiaofeng , Wang Nan 
Published: February 2020

Abstract
With the high proportion of new energy access, the randomness of the supply side increases. The electrical power system system is transformed from a unilateral stochastic system on the demand side to a bilateral stochastic system on the supply and demand side. Firstly, this paper studies the potential risks of power system under the randomness of supply and demand sides;Then, according to the principles of integrity, relevance, operability, quantitative and qualitative combination, the evaluation index system of bilateral randomness for the safety and stability risk of power system is constructed. Finally, a risk assessment model is constructed based on the static subjective weights of FAHP and similarity clustering analysis and the dynamic objective weights of the improved CRITIC weighting method.
Preparation of porous iron hydroxy phosphate by phosphate slag and its application for adsorbing heavy metal Pb2+
Authors: Guo Weilin , Li Chenxin , Cao Ying , Song Xianzhen , Wang Lijun , Kong Lingxue 
Published: February 2020

Abstract
Porous iron hydroxy phosphate was prepared by hydrothermal purification, ball milling modification, hydrothermal crystallization and high temperature roasting of phosphating slag, and was used to treat lead-containing wastewater. The adsorbent was characterized by XRD, SEM, FTIR and TG, and the effect of the amount of adsorbent and the pH value of the system on the adsorption performance of PIHP was investigated. The results showed that when the amount of PIHP added was 0.5g, the removal rate of pb2+ could reach 91% after 120min. When the amount of PIHP added was 0.2 g and the pH of the system was 2.15, the removal rate of pb2+ after 120min could reach 95%. This research has opened up a new direction for the resource utilization of phosphating slag.
Influence of Carbothermal Reduction Process on the Microscopic Properties of Lime-Free Roasting Chromite Ore Processing Residue (COPR)
Authors: Cheng Geng , Quan Xuejun , Luo Huazheng , Bai Weiyang , Cunfang Lu 
Published: February 2020

Abstract
The lime-free roasting chromite ore processing residue (COPR) was more environmentally friendly than the lime-based COPR. And its components in lime-free COPR should be reused as secondary resource. The process of carbothermal reduction associated with magnetic separation was adopted in this study to reclaim the iron oxide in lime free roasting COPR. The microscopic properties of COPR samples treated by carbonthermal reduction were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), etc. The effects of process parameters on iron recovery rate were studied by single-factor experiments. The results indicated that the carbothermal reduction roasting process was beneficial to the destruction of the iron-rich spinel in the original lime-free roasting COPR and the enrichment of iron metal in lime-free roasting COPR. The optimal conditions were obtained as follows: reduction calcination temperature of 1100 °C, reduction time of 2 hours, coke ration of 3.5 times of theoretical content. The main components of the separated fraction were iron particles and some magnesium aluminum spinel.
Production and characterization of modified biochar by corn cob and its ability to absorb phenol
Authors: Wang Guanghua , Zhang Zheng , Li Wenbing , Du Changjun , Chen Tie 
Published: February 2020

Abstract
The adsorption performance of KOH modified biochar as adsorbent for phenol in aqueous solution was investigated. The effects of initial pH of the solution, initial concentration of phenol, contact time and temperature on the adsorption capacity of phenol were investigated. Adsorption isotherms, adsorption kinetics and thermodynamic analysis were examined. The results showed that the specific surface area of modified biochar was 487.64m2·g−1, the content of C is 72.06 wt.% and the value of H/C is 0.05, the aromatization degree of modified biochar is very high. The results showed that the maximum adsorption capacity of the modified biochar is 217.06 mg·g−1 at 298 K, which is higher than that of biochar. The adsorption process accords with the Freundlich adsorption isotherm model and pseudo-second-order kinetic equation. Thermodynamic analysis shows that adsorption is spontaneous and exothermic.
Study on Thermal Oxidation and Viscosity Degradation for Synthetic Aviation Lubricant Fluids
Authors: Yi-Wei Fei , Shao-Jun Ruan , Jun Ma , Feng Guo 
Published: February 2020

Abstract
The thermal oxidation and viscosity degradation for poly-α-olefins (PAO) and di-esters (DOS) was studied under the GC/MS investigation. Through the oxidative pyrolysis conditions, these two synthetic base fluids were characterized to get their simulated “areo-engine” conditions’ for thermal stability, such as oxidative and kinematic viscosity variation. The experimental results suggests that the oxidation products generated from oxidation reactions of DOS is mainly single esters, di-esters, ketone, ether, organic acids and alcohol, which results much bigger total acid values than that of PAO treated in similar conditions. The substantial increment of the kinematic viscosity of DOS reveals its limited thermal oxidation stability compared to PAO.
Study on microwave pyrolysis of Mengdong lignite by Fe/Ca@Al2O3 catalyst
Authors: Wang Guanghua , Li Xiaoyuan , Wang Qingdong , Ma Zhiyong , Li Xiaodan 
Published: February 2020

Abstract
Microwave pyrolysis coal has the characteristics of fast heating, short time and high content of active components. In order to further improve the production and relative content of hydrogen(H2) and carbon monoxide(CO) during microwave pyrolysis of lignite, Fe/Ca@Al2O3 catalyst was synthesized by co-precipitation with Al2O3 as the carrier, and the effect of Fe/Ca ratio on the production and content of active components (CO+H2) in pyrolysis gas were studied. With the addition of catalysts, the pyrolysis process was advanced, and the final temperature rise was high. 12Ca/Fe catalyst has the most obvious effect on improving the production of H2 and CO, with an increase rate of 36.6% and 54.8%, respectively.
Low NOX combustion mechanism of coke oven gas with excess air coefficient and flue gas recirculation
Authors: Wang Guanghua , Yan Zihao , Wang Qingdong , Wang Guocheng 
Published: February 2020

Abstract
With the more stringent NOX emission limit from the coking chemical industry, the coking production with only one type of low NOX combustion technologies cannot meet the emission requirement. Thus a new low NOX experimental system was developed with the help of the external flue gas recirculation (FGR) and reasonable excess air coefficient, where the goal is to reduce NOX emission effectively. And an experiment was carried out on the 18 KW coke oven gas (COG) combustion device, and the effects of excess air coefficient, the ratio of flue gas recirculation and air preheating temperature on the combustion characteristics and NOX formation were extensively studied. The results show that there is an important effect of excess air coefficient, ratio of FGR and air preheating temperature on the temperature distribution inside the furnace and the formation of NOX. When the air excess coefficient of 1.2 and an external flue gas recirculation rate of 20% to 25%, the emission of thermal nitrogen oxides can be significantly reduced.
Effect of Fe-modified ZSM-5 catalyst during microwave assisted pyrolysis of Mengdong lignite for the oil production
Authors: Wang Guanghua , Li Xiaodan , Wang Qingdong , Li Wenbing 
Published: February 2020

Abstract
Microwave catalytic pyrolysis of Mengdong lignite by Fe-modified ZSM-5 catalysts was studied. The effects of pyrolysis method and the ZSM-5 molecular sieves loading different amounts of Fe2O3 on the total tar yield were investigated. The results show that the microwave heating technology could effectively improve the yield of lignite pyrolysis tar; In the conventional pyrolysis, the total yield of raw coal pyrolysis oil was 2.19%. When the Fe2O3 loading was 5%, the catalyst had the best effect with the yield of 3.56%, and the increase rate was 62.56%; Under microwave condition, the pyrolysis oil yield of raw coal is 6.43%. When the Fe2O3 loading increased from 0 to 10%, the total yield of tar increased from 7.02% to 9.47%. When the Fe2O3 loading was 10%, the catalyst had the best effect with the increase rate of 62.56%.