bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Compound Flocculant for Oil Sand Mature Fine Tailings Two-Stage Treatment
Authors: Peng Yunyan , Jin Dong 
Published: December 2019

Abstract
The flocculation method had a good effect in treating oil sands tailings, and polyacrylamide (PAM) was commonly used as an effective flocculant. In this paper, poly diallyl dimethyl ammonium chloride (PDADMAC) combined with PAM and several supplementary materials into three compound flocculants were used to treat oil-sand tailings for the first time. The compound flocculants were applied for two-stage treatment to compare their performance with that of PAM. The first stage flocculation results showed that mature fine tailings (MFT) treated by compound flocculants had faster initial settling rate, higher clarity of supernatant and higher solid content of sediment than PAM, especially Flocculant A. The second stage dewatering of the mud layer indicated that the water release ability of sediment treated with compound flocculants was better than that of PAM, the yield stress was more appropriate and the capillary suction time (CST) was shorter. The deposits treated with the same flocculant for the two stages had great strength gain so reclaimation became much easier, which provided a new and efficient flocculation solution for the treatment of oil sands mature fine tailings.
Overview of the rheological models for rocks
Authors: Zhong Tingkun 
Published: December 2019

Abstract
This paper introduces the models of rock rheological element model, including classical models and some new models proposed based on the basic models. The classical models are Maxwell model, Kelvin model, Burgers model, and Xi-yuan model. The improvements in the new models mainly focus on using the nonlinear Newtonian body to replace the linear Newtonian body in viscoplastic body. The establishment method and constitutive equations of the new models are also presented. These new models can represent the properties of the corresponding type of rock and soil, and the feasibility of the models has been verified by experiments and modelling. All these researches provide more models in representing the rock rheology behaviour of soil, which is of vital importance in the study of soil and rock mechanics.
Reason analysis and prevention measures of abnormal O2 concentration in return air corner of super-long mining working face of shallow depth seam
Authors: Liu Biaoyi , Zhang Qingsong 
Published: December 2019

Abstract
Due to the occurrence conditions and mining characteristics of super-long working face in shallow depth seam, In normal mining process of the working face, various factors caused O2 concentration reduced in the return air corner, including the raw coal absorbed a large number of oxygen and even coal oxidation spontaneous combustion consumed oxygen, the increase of working face tendency length, surface subsidence and leakage, air leakage in adjacent goaf, air leakage in the mined-out area behind and nitrogen injection fire prevention technology in goaf. In order to increase the oxygen concentration at renturn air corner, some effect measures were taken, such as optimizing the mine ventilation system, Increasing air leakage resistance in goaf, Changing the state of airflow field at the return air corner and reasonably arranging the position of nitrogen injection outlet in goaf. To create a safe working.
Simulation and Optimization of Polystyrene Free Radical Polymerization Process
Authors: Chen Wangbin , Zhao Pengfei , Wang Xiaorong 
Published: December 2019

Abstract
A model for bulk polymerization of styrene was established by using the POLYMER module of ASPEN PLUS. The effects of the chain initiator (TBP), solvent (ethylbenzene) and the chain transfer agent (DDM) on the yield, number average degree of polymerization(DPN), weight average degree of polymerization(DPW), number average molecular weight(Mn), weight average molecular weight(Mw) and the polydispersity index(PDI) of polystyrene were investigated. Through the analysis, we can first consider the amount of styrene to obtain roughly the parameters of the polystyrene process. As the use of initiator in polymerization has the optimal value, we must strictly control the amount of TBP according to the amount of monomer styrene, and adjust the amount of chain transfer agent to control the product quality accurately.
An Optimal Method for Deepwater Oilfield Development System
Authors: Qiu Weiwei , Xiaoxuan Xu 
Published: December 2019

Abstract
The development of petroleum production systems has become more and more sophisticated due to the complexity of deepwater oilfields. Selection of a field development option in early phase will significantly affect overall project economics, schedule and risk. Important factors that drive the selection of a deepwater field development and production system that including subsea production, floating platform, flowline and riser system and export system are identified in this paper. The screening starts with a fair number of potential alternatives. Invalid or obviously inferior combinations were eliminated and this yields a “long list”. Considering the factors reservoir, fluid characteristic, wells, regions and so on, a “short list” was resulted. Finally, it presents a model for decision-making that takes into account the main goals of a company, through the use of fuzzy mathematics. A case study results suggest that the best alternative is not always the one existing the best economic indicators.
The GCMC simulations of adsorption of ethanol and water in zeolitic imidazolate frameworks
Authors: Liu Xiuying , Yuan Junpeng 
Published: December 2019

Abstract
The adsorption mechanism of ethanol and water in five zeolitic imidazolate frameworks (ZIFs) has been investigated using grand canonical Monte Carlo (GCMC) method. The single adsorption isotherm and the selectivity of mixture adsorption of ethanol and water in ZIFs have been obtained. The results show that, at lower pressures (<10kPa), the adsorption amounts decrease in the order of ZIF-2>-10>-6≈-8≈-4. However, when the pressure is higher than 10kPa, the uptakes order is ZIF-10>-2>-6>-8>-4. And the water uptake decrease with the order of ZIF-10>-2>-4>-6>-8. However, the water uptakes for all the ZIFs is very small. The mixture adsorption of ethanol and water shows that, at a given lower pressure, the selectivity decreases as ZIF-2>-8>-10>-6>-4. However, at a given higher pressure, the selectivity is in the order of ZIF-10>-2≈-6≈8>-4. It can be concluded that ZIF-2 and -10 are suitable for the adsorption and separation of biofuel of ethanol. The total interaction energy distribution of ZIFs with ethanol/water has also been analyzed to interpret the adsorption mechanism of ethanol and water in ZIFs.
Production and marketing scheduling of natural gas based on table-manipulation method and Lingo software
Authors: Gao Jianfeng , Jin Juanhua , Wang Yan 
Published: December 2019

Abstract
How to formulate a reasonable natural gas production and marketing operation scheduling strategy to make natural gas production and sales work effectively is an urgent problem to be solved by China’s oil and gas enterprises. Taking a gas company as an example, this paper used linear programming to establish the corresponding mathematical model. Firstly, the problem of imbalance between production and sales is transformed into a balance problem, and then solved by using the table-manipulation method. The Vogel method is chosen to identify the initial basic feasible solution, and then the potential method is used to judge the optimal solution. In the end, the lowest operating cost solution for multiple gas sources is obtained. In addition, the example is solved by Lingo software in this paper, which provides a new method and new ideas for natural gas scheduling management.
Effects of different buckle shed time on catalase activity and malondialdehyde content in grape leaves
Authors: Hu Rongping , Fan Zhonghan , Chen Song , Huang Yan , Lv Xiulan 
Published: December 2019

Abstract
The effects of different buckle shed time on catalase (CAT) activity and malondialdehyde (MDA) content in grape leaves (tender, function and old leaves) were studied involving the following: without buckle shed (CK), buckle shed on January 1st, 2018 (BS I), buckle shed on January 20th, 2018 (BS II), sampled 6 times with interval one week. The result showed that buckle shed increased the CAT activity of grape tender and function leaves, the grape tender leaves of BS I and BS II at the sampling date 4 had the highest and increased by 32.36% and 39.14% respectively, but the grape function leaves of BS I and BS II at the sampling date 2 had the highest and increased by 25.46% and 26.53% respectively. The buckle shed had no significant effect on CAT activity of grape old leaves in early sampled date. The different buckle shed time had no significant effect on CAT activity of grape leaves. Buckle shed increased the MDA content in grape tender leaves, the grape tender leaves of BS I and BS II at the sampling date 4 had the highest and increased by 204.0% and 202.7% respectively. Buckle shed decreased the MDA content in grape function leaves, the grape function leaves of BS I and BS II at the sampling date 2 had the lowest and increased by 46.39% and 48.19% respectively. The MDA content of grape old leaves in the early sampled was decreased compared with control, but in the later sampled increased.
Effects of different time of buckle shed on superoxide dismutase and peroxidase activities of grape leaves
Authors: Hu Rongping , Chen Song , Fan Zhonghan , Huang Yan , Lv Xiulan 
Published: December 2019

Abstract
The effects of buckled shed of different time on the superoxide dismutase (SOD) and peroxidase (POD) activities of grape leaves (tender, function and old leaves) were studied by without buckle shed (CK), buckled shed on January 1st, 2018 (I) and buckled shed on January 20th, 2018 (II), sampled 6 times with interval one week. The results showed that the SOD and POD activities of grape tender leaves and functional leaves under buckled shed on January 1st and buckled shed on January 20th treatments were increased to varying degrees. However, the activities of SOD and POD of grape old leaves under buckled shed on January 1st and buckled shed on January 20th treatments increased in the early stage and decreased in the later stage. The SOD activities of old leaves sampled for the sixth time were higher 17.17% and 12.00% than those of the two treatments, respectively. The POD activity in old leaves in the sixth sampling of treatment buckled shed on January 1st decreased 11.00%. The results showed that the activities of SOD and POD in tender leaves, functional leaves and early old leaves of grapes were increased by the treatment of buckled shed, which indicated that the treatment of buckled shed could promote the growth of grapes and enhance resistance, and there was no significant difference between the buckled shed on January 1st and buckled shed on January 20th treatments.
Design of Intelligent Comprehensive Security System for Existing Office Building
Authors: Yin Chunliang , Du Liandong 
Published: December 2019

Abstract
This project is an overall renovation of the existing government administrative office buildings. In order to realize the overall management of office and security, the owner requires that the security monitoring center and the intelligent management center should be placed in one center, and there should be related interfaces. In addition, cooperation between different brands is often encountered in the project operation, and a set of intelligent weak current systems need to be built, which leads to the integration and integration of management platforms becoming a difficult problem. The owner hopes to obtain a very smooth resource interaction environment. Each access subsystem is regarded as the management module of the platform. Only by realizing the unified management of the platform, the coordinated operation of each access subsystem and the organic combination of the whole system can the real expectations of the owner be met.
Research on base isolation design of nuclear island plant of a new-type metal-cooled fast reactor
Authors: Liu Guo , Fan Yibo , Bai Yanqiang , Xiaohai Qi 
Published: December 2019

Abstract
This paper establishes a 3D finite element model of a new-type metal-cooled fast reactor (MCFR) nuclear island plant for applied research of base isolation technology, and the research includes the base isolation scheme for the split base layer structure, the selection from different types of isolation bearings, etc. According to the mechanical characteristics of different isolation bearings and rigidity distribution of the structure itself, the layout of isolation bearing scheme is carried out. Dynamic analysis of nuclear plan has been done based on ANSYS, and the optimal isolation scheme is determined by repeated trial calculation, isolation design schemes adjustment, acceleration and displacement of key nodes comparison. The results show that: applying base isolation design to the nuclear island plant, natural vibration period of the structure increases, acceleration response of the key nodes of the superstructure and displacement between the layers of the structure significantly decreases, seismic resistance of the nuclear island plant is improved significantly; isolation effect of the scheme with multiple types of isolation bearings is much better than that of the scheme with only rubber bearings.
Construction of Ag spherical micro/nanostructures as SERS-active substrates
Authors: Huayu Zhou , Jingjing Wang , Qing Chen , Xiangna Zhang , Chaorong Li 
Published: December 2019

Abstract
The silver spherical micro/nanostructures were fabricated by the electrochemical deposition technique. Many silver nanosheets build the spherical microstructures. Confirmed by XRD, UV-VIS and SEM characterization measures, the Ag spherical micro/nanostructures were synthesized on the ITO conductive substrates. Furthermore, different current densities were selected to investigate the growth of Ag microspheres. As the gaps between the nanosheets formatted the “hot spots”, which can effectively enhance the Raman signal, we chose the R6G molecule as the probe molecule to evaluate the SERS performance. The experiment results prove that the Ag spherical micro/nanostructures obtained by the simple electrochemical techniques can be used as high-performance SERS-active substrates.
Rock burst risk prediction method based on multi-factor pattern recognition and its application in coal mine
Authors: Zhao Weiguo , Lan Tianwei , Wang Jiren , Sun Jiuzheng , Qiang Li 
Published: December 2019

Abstract
Rockburst is one of the typical dynamic disasters in coal mine, and risk prediction of rockburst is the primary task of implementing comprehensive prevention and control measures. In order to predict the risk of rockburst in different areas of No. 9 coal seam in Jixian coal mine, the geo-dynamic division method is adopted to determine the characteristics of fault developments and mine field structures. Geological structure model is established and the influencing factors of rockburst such as fracture structure, roof lithology, stress and mining depth are analyzed in this paper. On these basics, the multi-factor pattern recognition method for predicting rockburst risk is put forward, and the risk of rockburst in Jixian coal mine is divided into four grades. The prediction results of the comprehensive index method for the 4th panel in second mining area are compared with the prediction outcomes of the multi-factor pattern recognition method. Results show that the multi-factor pattern recognition method have good performance in predicting the rockburst risk, thus providing theoretical and technical support for the management of rockburst.
Research on the Stable Region Division of Urban Underground Space Development
Authors: Ziguang Zhang , Jianli Li , Guangyong Cao 
Published: December 2019

Abstract
Based on giving full play to the self-stabilization ability of surrounding rock, this paper puts forward the concept, ideas and research methods of stable region division of urban underground space development. Then, the stable region division is systematically studied in the single stratum and the composite strata of upper soil and lower rock under different thickness of overlying soft soil stratum and different excavation span. It is pointed out that the larger the thickness of soft soil stratum is, the larger the excavation span is, the greater the boundary depth between the difficult stable region (DSR) and the easy stable region (ESR). Finally, combining with the characteristics of topographic and geomorphological and the statistical analysis of stratum thickness and its physical and mechanical parameters, the spatial distribution map of difficult and easy stable region of underground engineering along Qingdao metro is drawn. The research results provide theoretical basis and scientific basis for rational planning and design of urban underground space development and utilization.
Method of Evaluation for the Construction Geology of Transmission Line Based on Gray System Theory
Authors: Shen Xiangliang , Ren Yu , Chai Linjie , Wang Lihuan , Zhang Deguang , Gao Fan 
Published: December 2019

Abstract
A good engineering geological environment is the premise of engineering construction safety and security. The construction of transmission lines needs to take topography, stratigraphic lithology, engineering geological hazard, structural geology into consideration, but the survey personnel always judge the engineering geological environment roughly only based on individual subjective experience, personal professional level when selecting the transmission line route. We call this judgment process has a gray feature in the point of gray system, while the gray scale can be reduced by the calculation based on gray system, each factor play their role in the evaluation process in their respective weight, so the quantitative, clear results can be obtained. This paper constructs the index system of engineering geological factors of transmission line, using gray evaluation system, and with the help of AHP, the quantitative evaluation results are obtained, and provide a theoretical basis for geological environment evaluation of transmission line engineering. Finally, the geological evaluation is carried out by a real construction and realized the transformation of theory to tool.
A Power Operation Site Safety Assistant System Based on Convolutional Neural Network
Authors: Zhang Yanjie , Li Hongwei , Liu Yunhou , Wang Yunfei , Pan Zhiyuan , Zheng Xin , Jiang Yawei , Liu Jing , Li Aijing , Jing Hui 
Published: December 2019

Abstract
Field operation safety is the key to the safety production of electric power enterprises. The current safety supervision of on-site work mainly relies on the management regulations. In lack of efficient, reliable and intelligent technical means, the management personnel have to supervise and inspect safety procedure on-site. In order to solve the high cost problem of on-site safety management, an intelligent auxiliary system based on deep learning convolutional neural network is proposed in this paper. The system mainly includes three parts: The portable terminal of operation ticket, AI data recorder and neural network calculation unit. It can realize real-time detection of on-site violations during power grid operation. The deep learning AI method is innovatively introduced into the field of safety supervision of power work site, and it provides a new intelligent way of safety supervision.
Parameter stability region analysis of nonlinear link in primary frequency regulation process based on description function method
Authors: Qi Zheng , Zhang Kunjun , Li Hongyi , Chen Gang , Shi Huabo 
Published: December 2019

Abstract
For the primary frequency regulation process of power system, there are some key nonlinear links in the model. After the optimization and transformation of water turbine governor for suppressing ultra-low frequency oscillatory in southwest power grid, its ability to participate in power grid frequency regulation is weakened. And the amplitude and frequency limit of power grid frequency fluctuation are increased; the number of frequency crossing the deadband limit of primary frequency regulation is increased; and the influence of nonlinear link is prominent. The previous pure linear system analysis methods are difficult to carry out effective analysis. Based on this, the paper proposes to use the description function method to analyze the influence of nonlinear links in the system. The parameter stability regions of nonlinear links in different types of frequency regulation models are determined according to the improved Nyquist criterion. Firstly, the nonlinear transfer function models of primary frequency regulation for different types of hydropower, thermal power, and direct current FC are established. This paper summarizes the structural similarity of nonlinear links of different primary frequency regulation resources, and the steps of analyzing its nonlinear link are put forward, and the corresponding simulation verification is carried out.
Classification and Recognition of Regional Landscape Elements of Highway in Guangdong Province
Authors: Zhao Ming , Pan Shaobing , Shang Xiaodong , Wei Xianwei , Yuan Minmin 
Published: December 2019

Abstract
Highway landscape and its regional elements think that it has the essential characteristics of various cultural phenomena, the functions of reproduction, dissemination and evolution, and the cultural diversity. Like all things in nature, it evolves with the changes of the times and the erosion of the historical river. Aiming at the historical changes of the region along the highway and the important activity space of continuing the local context, this paper studies the expression forms and recognition methods of the regional elements in the landscape by excavating the historical context of the region. The research results of this paper can be used in highway construction to better identify regional landscape elements and inherit historical and cultural factors.
Development and Application of adjustable soft ladder head of transmission lines
Authors: Jun Ma , Yonggang Shi , Gang Dong , Fuxing Gong , Kegang Wei , Xin Su , Yu Ding , Zhu Wang 
Published: December 2019

Abstract
Soft ladder head was mainly used for connecting soft ladder and hangs from a convenient tools for live working on the wire in areas of existing transmission technology. Usually it includes a ladder head rectangular frame. Head on top of the frame is installed in the escape of at least two side-by-side pulleytype hook. Pulley type hook into a curved hook. Bending coupler overlap there is between the pulley. Pulley wheel surface of hook is on the wire. Implementation of sliding go along with the wires. The lower end of the frame is welded with hanging rings connected with the soft ladder. The ladder frame is made of aluminium alloy. The stability of the soft ladder is good, the safety factor is high, and the overhaul personnel work at high altitude becomes relaxed and happy. The soft ladder head of vertical double-split conductor is fixed structure[3-5]. However, the distance between two vertical bundled conductors of domestic transmission lines is not the same distance. This requires the maintenance department to equip with a number of software heads. If you are not familiar with the line situation, you need to bring a number of solutions. This makes it impossible for the original ladder head to realize a set of ladder heads for various purposes. It does not have generality, increases cost and affects work efficiency.