bluuebunny/crossref_metadata_2025_split huggingface dataset:
Smart park integrated management cloud platform architecture based on microservice governance framework
Authors: Huang D , Jiang G D , Sun B H , Feng R Q , Wu J P 
Published: October 2019

Abstract
Nowadays, the park and its enterprises face many challenges in the global environment that is service-oriented, customer experience centered and customer demand oriented. ICT is becoming a major promoter and partner for smart parks and modern businesses. The smart park takes advantage of the results of data integration and sharing, and provides decision-making through data analysis, making the park more “intelligent” for corporate and individual services. An integrated management cloud platform architecture of smart parks based on the micro-service governance framework is proposed in this paper, which adopts the springclass micro-service governance framework to solve the problems of “data island”, “power island”, and “user experience” among the information subsystems of smart parks. The information and services will be integrated well to make quick response to changes in the extensional needs of the park’s operational services, and to achieve high scalability the system.
Research on Harmonic Suppression of High Temperature Boiler Based on Three-phase PWM Rectifier
Authors: Zhang Q , Qian P 
Published: October 2019

Abstract
Traditional boiler temperature control is based on thyristor voltage regulation, and the output AC voltage is controlled by controlling the trigger angle α of thyristor, so that the boiler temperature can be controlled in the pre-set range. However, this way of voltage regulation and temperature control will cause serious harmonic pollution to the power grid, and the output current has high harmonic content and low power factor. At the same time, the traditional three-phase load connection mode generally adopts star connection, and the load is pure resistive silicon carbide. Because of long-term use, the aging of silicon carbide heating rod is different, in fact, it is asymmetric load, three-phase load. The unbalance will cause three-phase unbalance, which will make the voltage of a certain phase exceed the rated working voltage of the heating rod, and greatly reduce the service life of the heating rod. Therefore, in order to improve the efficiency of power supply, reduce harmonic pollution and solve the problem of three-phase unbalance, this paper proposes a three-phase PWM rectifier circuit, which converts AC to DC, and realizes DC voltage regulation and temperature control through PI regulator. In this paper, the feasibility of the scheme is verified by simulation and comparative analysis.
Model Predictive Current Control with a Fixed Switching Frequency for Power Factor Corrected Rectifiers in Microgrid
Authors: Hong Y M , Lin Q B , Zong Y , Shi Y , Su X J 
Published: October 2019

Abstract
In this paper, a model predictive current control (MPCC) strategy with a fixed switching frequency to control the dual boost bridgeless power factor corrected (PFC) converter is proposed. The improved MPCC strategy solves the problem of filter design and the high electromagnetic interference (EMI) which caused by the traditional MPCC. With the consideration of a nonlinear inductor, a formula is fitted to represent the change of the inductance, and the improved strategy has strong robustness. The simulation and experiment shows that the quality of current and power factor of the system is improved by the proposed control strategy.
Data mining and data driving of harmonic in AC arc furnaces based on functional analysis
Authors: Deng P , Xu X , Wang F Y , Chen Z 
Published: October 2019

Abstract
This paper use big data technology, mine synchronous harmonic measuring data of AC arc-furnaces whole production process with functional analysis, verifies that harmonic current released from AC arc-furnaces is in independence and orthogonality approximately between each other. The discovered knowledge shows that multi-arc-furnaces harmonic current can be largely counteracted each other, If these AC arc-furnaces were connected to a PCC in which short-circuit capacity is enough for that the superposed harmonic current of AC arc-furnaces can be electromagnetic compatible, then power quality of the PCC can reach the qualified level discovered knowledge further reveals the model of AC arc-furnace, disorder data stream generated from harmonic measuring data is derived to calculation composition harmonic current at PCC(Point of Common Connection) in which AC arc-furnaces were connected.
Greenhouse Gas emission determination of typical infrastructure in High Andean cities: Study Case Ambato city-Ecuador
Authors: Mayacela C , Núñez G , Cañizares B , Moya D 
Published: October 2019

Abstract
The building sector is one of the most important commercial activities all over the world, being one of the main producers of Greenhouse gas (GHG) emissions. In the current investigation an evaluation of the emanation of Carbon Dioxide equivalent (CO2e) was performed to different of typical buildings in Ambato city, Ecuador. It was applied the GHG Protocol and ISO 14064-1 standards for companies and organizations. The GHG emissions calculation was based on the most representative work volumes of typical buildings of this Andean city, and its corresponding emission factor. The results show that structure type III emits more CO2 because more structural steel, concrete and clear glass are used in its construction due to its architectural and structural design.
The Economic and Environmentally Friendly Tree Felling Techniques in Natural Forest
Authors: Suhartana S , Yuniawati  
Published: October 2019

Abstract
Improper tree felling techniques may reduce productivity and log supply. This leads to an increase in production cost. Timber Utilization Efficiency (TUE) in natural forests has not been optimally implemented, thus leaving residual stands with tremendous damages. This study was carried out in late 2015 in PT Inhutani II, North Kalimantan to investigate the implementation of felling techniques and to analyze felling productivity, TUE, production cost, and residual stands damage. Productivity, felling cost, and TUE data were tabulated and averaged. Results revealed that: (1) tree felling techniques implemented on the site were the reduced impact logging (RIL) technique; (2) the average felling productivity and production cost were 38.308 m3/hour and IDR 13, 935.10/m3, respectively; (3) the average TUE was 92%, with only 8% generated-wastes; and (4) the average destruction of residual stands was 13.54%, which comprised of canopy damage, broken/cracked, stem injury, and leaning.
Application of chromatographic fingerprint technology in study of single layer capacity contribution of multi-zone shale oil well in Jimsar Sag
Authors: Li Erting , Jin Jun , Liao Jiande , Chen Jun , Hou Dujie , Jiang Yuhan , Mi Julei , Zhang Ziming 
Published: October 2019

Abstract
Based on the principle of chromatographic fingerprinting technology, P2
l
2
2-1, P2
l
2
2-2and P2
l
2
2-3 single layer shale oil chromatographic fingerprint libraries of upper sweet spot in Jimsar Sag were established by laboratory matching experiment. The partial least squares method was used to realize the capacity contribution calculation and dynamic monitoring of the single layer in two layer and three layer shale oil of the dessert in Jimsar. The result shows, upper sweet shale oil of Lucaogou Formation in Jimsar Sag are mainly supplied by P2
l
2
2-1 layer and P2
l
2
2-2 layer. Oil mainly supplied by P2
l
2
2-1 layer in the wells of JI 37 and JI 171, which are combined with P2
l
2
2-1 and P2
l
2
2-2. Oil mainly supplied by P2
l
2
2-2 layer in the wells of JI 25 and JI 173, which are combined with P2
l
2
2-2 and P2
l
2
2-3. Oil mainly supplied by P2
l
2
2-1 layer in the wells of JI 174 and JI 176, which are combined with P2
l
2
2-1, P2
l
2
2-2 and P2
l
2
2-3, followed by P2
l
2
2-2. In addition, it is found that with the progress of oil exploitation, the contribution rate of P2
l
2
2-1 in JI 174 well and JI 176 well is gradually reduced, and P2
l
2
2-2 becomes the main oil supply layer. The physical properties and oil saturation of the corresponding reservoirs in each well were analyzed. And the results proved the accuracy and rationality of the calculation results.
New insights on Muglad’s Cretaceous source rocks: a paleo-geographic review & organic geochemical characterization, Muglad basin, Sudan
Authors: Omer Fadul Abul Gebbayin I M , Zhong N , Luo Q , Abu Elgasim E , Shi S 
Published: October 2019

Abstract
Pyrolysis, chromatographic, and isotopic techniques were applied to study a suite of (174) rock cuttings from Muglad’s block 2 & 4, aiming at identifying and fully characterizing the potential source rock/s in the basin. Two source rock units were recognized and described as good-very good for hydrocarbon generation in the study area. These include the middle Early Cretaceous Abu Gabra and the top Late Cretaceous Baraka formations. The former consists of a good-very good organic rich shales (TOC = 1.0-4.0 %, S2 >20 mg HC/g TOC), of mixed kerogens dominated primarily by the oil prone type-I (HI = 600 mg/g) in association with few type-III, and is currently thermally mature for hydrocarbon generation in the basin peripheries and over mature in the centre. The Baraka displays a wide hydrocarbon generative potential ranging from fair to very good (TOC = (0.5-4.0%) and S2 yield of (2.0-20 mg HC/g TOC), of mainly type-II oil and gas prone kerogen (HI = 450 mg/g), and thermally mature for hydrocarbon generation in the basin centre only.
Biomarker characteristics of the analyzed samples reveal three main organofacies units; a (I) freshwater oxic to sub-oxic clay-rich Early Cretaceous distal lacustrine, (II) a highly anoxic, and clay-poor Late Cretaceousdistal marine, and a (III) proximal lacustrine and/marine of both E. and L. Cretaceous. Organofacies-I shows relatively high ratios of: [Pr/Ph (1.2-3.02), C26/C25 tricyclic terpanes (1.11-3.12), Ts/Tm (0.95-1.33), gammacerane indices (0.14-0.50), and diasterane/regular steranes] with low: [tri- and tetracyclic terpanes, C17/C25 n-alkanes (1.0-1.5), C29/C30 hopanes (0.55-1.14), and pregnanes & homopregnanes]. Organofacies-II inversely, is characterized by very low [Pr/Ph ratios (0.37-1.0) suggesting extreme anoxic conditions, C26/C25 tricyclic terpanes between (0.50-1.0), Ts/Tm (0.21-0.50), Gammacerane indices (0.05-0.22), and low diasterane/regular steranes (0.34-0.66)] with high: [tricyclic terpanes content dominated by the C23 variety, C24 tetracyclic terpanes, C17/C25 n-alkanes ratios (3.7-5.12), C29/C30 hopanes (0.4-1.11), and abundant pregnanes and homopregnanes]. Organofacies-III is amerely proximal sub-facies of the former two differentiated basically on the basis of the redox conditions of their corresponding depositional environments and amount of terrigenous organic matter supply. The isotopic data is fairly consistent with the biomarkers in delineating the same three organofacies units. We relate the marine input into Muglad basin during the L. Cretaceous to the global L. Cretaceous sea transgressions in Africa and thus foresee a booming new exploration opportunity in the basin.
Failure Analysis of the Semi-permanent Coupler Used in Metro Rail
Authors: Morsy M A , Khafagy S , Mosa ES 
Published: October 2019

Abstract
Failure analysis of the semi-permanent coupler which failed in service of Metro rail was conducted in order to know the reason for failure. The examinations include visual, photo detection, chemical analysis, hardness measurements, tensile and v-notch impact test, microstructure and SEM observation of fracture surface. Chemical analysis and tensile test shows that the coupler material can be classified as grade B cast steel in AAR M201 steel casting specification. Although the microstructure of the coupler material shows incomplete homogenization indicating the improper conduction of heat treatment, the v-notch impact results is accepted according to this specification. The fracture surface shows the existence of much porosity at the internal surface of the hollow like pipe- coupler and the fracture started at these sites showing beach marks. SEM observation of the fracture surface shows fatigue striations indicating the occurrence of fatigue started at the porosity defects. The cast defects act as a stress concentration site for fatigue crack initiation. Crack occurred, propagated, and connected the defects to each other. The occurrence of collision resulted in bending of the female part of the coupler (plastic deformation occurs) at the lower thin wall (∼ 5.41 mm thickness). Moreover, opening of the previously formed fatigue crack and accelerating the failure were occurred. Recommendations were explained to prevent the occurrence of this failure.
Assessing the Dispersion Quality of Carbon Nanotubes Suspensions by Low Field Nuclear Magnetic Resonance
Authors: Huang Yongping , Hong Shuxian , Li Weiwen , Guo Shijie 
Published: October 2019

Abstract
In this study, a novel method based on low field nuclear magnetic resonance measurements were used to characterize the dispersion quality of carbon nanotube suspensions. The liquid specific surface area, which calculated with the relaxation time, were used as an indicator of dispersion quality of the carbon nanotubes suspensions. The experimental results were compared with those measured by the conventional method methods, including Zeta potentiometer method and ultraviolet visible spectrophotometer method. The results show that low field nuclear magnetic resonance has the advantages in the characterizing the dispersion quality of high concentration carbon nanotube suspensions and tracking its re-agglomeration process non-destructively.
Facile Preparation of Ag-TiO2 Nanocomposite with Enhanced Photocatalytic Properties
Authors: Tian Tao , Yao Chuangye 
Published: October 2019

Abstract
For decades, photocatalytic semiconductor materials were regretfully limited to low-yield preparation method and poor catalytic efficiency although it has dramatically captured attention in sewage treatment applications. To expand this slim range of semiconductor catalysts, the nanocrystalline silver embedded in titanium dioxide (Ag-TiO2) heterojunction was prepared by means of facile mechanical milling technique capable of large-scale production, in terms of optimum Ag content. The as-obtained Ag-TiO2 nanocomposite particles were systematically characterized by means of X-ray diffraction technique, Raman spectra, X-ray photoelectron spectroscopy, transmission electron microscopy analysis, and UV-vis spectrophotometry. Results suggest that in comparison with pure TiO2 catalyst, Ag-TiO2 nanocomposite catalyst significantly enhanced photocatalytic activity for the degradation of methylene blue (MB), whereas its band gap decreased in view of the red-shift phenomenon. In terms of the experimental results, a mechanism was proposed to explain the enhancement of photocatalytic activity. Our findings offer a promising route towards the large-scale preparation of high-efficiency photocatalysts for commercial applications.
Four Amino Acid Residues in Acyltransferase Affect the Production of Epothilone A to Mixed Epothilones A and B
Authors: Sun Xin , Li Pengfei , Li Yuezhong , Zhao Lin 
Published: October 2019

Abstract
Surveying more than 100 native epothilone producing strains were isolated from different locales revealed that the production ratio of epothilones A and B was sorted into two groups, almost single epothilone A or approximate 2:1 ratio of A and B. Sequencing the second acyltransferase in the epoC module (ATModC2) of different Sorangium producers indicated that four amino acid residues at sites 90, 91, 95 and 196 in the enzyme active centre altered in parallel to the production ratio shift. In those producers with single epothilone A, ATModC2 had almost the same sequence and computational structure as ATModC1, which selectively accepts malonyl-CoA as the extender units.
Properties and Extraction of Crude Pectin Esterase from Potato (Solanum Tuberosum)
Authors: Li Jing , Li Xiaowan , Li Shanshan , Shen Guanghui , Luo Qingying , Wu Hejun , Chen Anjun , Zhang Zhiqing 
Published: October 2019

Abstract
In order to study the enzymatic properties of potato esterase, the crude enzyme of potato esterase was extracted with phosphate buffer solution, and the extraction conditions were optimized. The optimal condition is: the optimal condition for phosphate buffer solution pH 7.0, water bath time for 30 min, extraction temperature 35°C, and solid-liquid ratio 1:4 (g/mL). The property analysis showed that the potato esterase extracted from phosphate buffer solution was not a single esterase, but a kind of esterase isozyme. At 273nm and 325nm, the potato esterase crude enzyme had two characteristics uv absorption peak, its isoelectric point was near pI 4.4, and its molecular weight was roughly distributed at 16.4, 20.866, 22.73 and 40.286 KDa. In 40 °C ∼ 45 °C, under the condition of pH 7.0, better able to maintain its activity, and seven kinds of metal ions are inhibitory effect to it. This study provides a theoretical basis for further understanding the enzymatic characteristics of potato esterase and its application in pesticide residue detection.
Material Analysis and Design of New Household Humidifier
Authors: Zhu Zhiwei 
Published: October 2019

Abstract
With the continuous improvement of people’s living standards, more and more people have higher requirements for health and quality of life. Humidifier as an indispensable small household appliances product in dry areas, it has become part of people’s life gradually. This paper investigates the market of humidifiers, and material analysis of different humidifier products, and design and launch a new type of household humidifier. The positioning of this design is to meet the user’s purchasing needs for modelling, Requirements for modelling not only highlight the simplicity and atmosphere of the product, but also meet the needs of consumers. While improving the quality of life and family environment, it becomes part of the happy family memory.
Outgassing Environment of Spacecraft: An Overview
Authors: Jiao Zilong , Jiang Lixiang , Sun Jipeng , Huang Jianguo , Zhu Yunfei 
Published: October 2019

Abstract
With the advancements of materials science and technology, organic materials found significant applications in aerospace industry. But under the orbital thermal and vacuum environment, organic materials can outgas and the outgassed products and induced environment often degraded performances of spacecraft or its subsystem. In this article, the typical impacts of outgassing environment on spacecraft are explained briefly. Then the outgassing theory, test method, identification of compounds and control measures were reviewed in detail. The need for transient and long-term outgassing model is discussed. The standard test methods of E595 and E1559 are compared. The promising new techniques such as infrared spectrometry and/or mass-spectrometry with thermogravimetric analysis is proposed for the identification of outgassed compounds. The vacuum bakeout and molecular absorber for outgassing control are reviewed and for the last more research work is needed.
Analysis of Harmonic Propagation and Coupling among Wind Farm Groups
Authors: Miao Xujuan , Liu Jinming , Li Changling , Zhang Xinyan , Xu Qidan , Yue Jiahui , Sun Ke 
Published: October 2019

Abstract
Although wind energy itself has the conditions of large-scale development and utilization, power quality has always been the focus and difficulty of wind power generation. Harmonics generated by power electronic equipment in doubly-fed generators may lead to overheating damage and faults of transmission lines and transformer equipment. To improve the safe operation and harmonic control ability of power grid and reduce the loss of electrical equipment, a model of double-fed wind farm group with voltage level of 690V/35kV/110kV was established in Matlab/Simulink. By analyzing the characteristics of harmonic propagation and coupling between wind farms under different conditions, it is found that when the harmonic source was on the fan side, the harmonic is transmitted from the fan side to the grid side. If the harmonic content of wind power station is large, it will have a greater impact on power quality. In addition, due to harmonic coupling, 110 kV bus current has the highest harmonic distortion rate and the highest harmonic content.
Design of Zero-gravity Unloading Process Equipment for Satellite Overlapping Antenna on Ground Test
Authors: Fan Yougao , Liu Guangtong , Liu Li , Yang Chunsheng 
Published: October 2019

Abstract
In this paper, the zero-gravity unloading scheme and the design scheme of the zero-gravity unloading process equipment are proposed for the three-overlapping antennas of a communication satellite. Due to the particularity of the structure, test state and unloading state of the communication satellite antenna, the zero-gravity unloading simulation process equipment commonly used at present cannot meet the test requirements. Based on the analysis of the requirements of zero-gravity deployment test and the process of the three-overlapping antennas zero-gravity unloading, a solution to meet the test requirements is proposed. System performance tests verified the effectiveness of the zero-gravity unloading system.
The Research on Key Technologies of Power Quality Comprehensive Control in Complex Distribution Network
Authors: Wang Shuanghu , Yin Hongxu , Liang Shun 
Published: October 2019

Abstract
As new types of power sources and loads such as distributed photovoltaic and electric vehicle charging facilities are connected to the distribution network, the distribution network has become more variable and complex, and the simple distribution network has evolved into a complex distribution network. The access of new elements, especially the application of power electronic devices, has a great impact on the power quality of the distribution network. The technical framework of power quality comprehensive management of complex distribution network is proposed, and the corresponding technical route is put forward from three aspects: the influence of power electronic equipment application on power quality of distribution network, power electronic equipment modeling of distribution network, flexible monitoring of power quality and rapid control.
The Effect of Pole Density on Permeable Groin Due to Controlling Longshore Current
Authors: Umar Hasdinar , Rahman Sabaruddin , Paotonan Chairul , Baeda A.Y. 
Published: October 2019

Abstract
Erosion and sedimentation problems that occurs, usually solved firstly by finding the cause of erosion and sedimentation literally, due to determining the action to overcome them. In coastal engineering, there are two approaches that can be used to solve such kind of problems; which are the soft approach, i.e. beach nourishment, vegetation, sand by passing, coastal boundary policy; while the hard approach or structural approach are building breakwater, jetty, groin, sea wall and so on. In structural approach, the uses of permeable groin nowadays is one of the new ways to overcome the erosion and sedimentation problems in beaches. To find out how efficient the permeable groin can control the flow along the coast, so called longshore current, a research needed to be conducted focusing on the effect of pole density at permeable groin itself. The ability of controlling longshore current will be the main analysis, in such various variations of pole densities at the permeable groin. It found out that the pole densities of permeable groin can significantly controlled the longshore current; which is if the pole density become higher than the speed of longshore current can be reduced. It also found out that by implementing 40% of pole density, the longshore current can be reduce up 50% respectively.