bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Prevention of Postoperative Abdominal Adhesions with PLGA Nanofiber Membrane
Authors: MengQing Sun , RuiZhe Tan , Peng Li , Peng Zou 
Published: November 2020

AbstractObjective: To evaluate the effectiveness of poly (lactic-co-glycolic acid) (PLGA) nanofiber membrane on prevention of postoperative abdominal adhesion. Methods: PLGA nanofiber membrane was prepared by high-voltage electrospinning technique. The effectiveness of the membrane in prevention of postoperative abdominal adhesions was characterized with rat abdominal adhesion models. Results: PLGA nanofiber membrane was prepared successfully by electrospinning technique. Scanning electron microscopy (SEM) observation showed that the average diameter of PLGA fibers was approximately 800 nm, and the membrane had microporous structures. Mechanical tests showed that the tensile strength of PLGA nanofiber membrane was 6.36 ± 0.39 MPa, which was significantly higher than the tensile strength of DIKANG absorbable medical film. The results of in vivo experiments showed that PLGA nanofiber membrane and DIKANG absorbable medical film could both reduce the degree of abdominal adhesions. The histological results showed that there was only a small extent of inflammatory cell infiltration in the PLGA group and the control group. The proliferation of connective tissue was reduced, and so was the degree of adhesion. Conclusion: PLGA nanofiber membrane can significantly reduce the incidence and severity of postoperative adhesions, and bodes well for future clinical applications.
Research on Testing Equipment for Anti-impact Performance of Building Guardrails
Authors: Su Zhonghua , Fan Lichang , Liu Zhongming , Sun Yang , Deng Xiaodong 
Published: November 2020

Abstract
The detection status and existing problems of the anti-soft and heavy object impact performance of glass and metal guardrails for buildings were briefly described in the article. A set of detection equipment was designed for the shortcomings, which mainly included guardrail installation devices, height positioning devices, and impact control systems. It has the advantages of small size, low cost, simple operation, high efficiency and low uncertainty, etc. In addition, the influence of factors such as installation quality and test environment on the test results can be excluded, which greatly improves the accuracy and fairness of the test results.
Calculation of Thermal Stress in Elastohydrodynamic Lubrication of Line Contact
Authors: Lu Zunyou , Lu Yanjun 
Published: November 2020

Abstract
A numerical method is proposed to calculate the surface thermal stresses of solids in thermal elastohydrodynamic lubrication of line contact. According to the method, the material line thermal expansion coefficients of lubricated contact surface are calculated after obtaining the pressure and temperature that meet the convergence conditions, then the thermal stresses are calculated. The results show that the values of the circumferential thermal stress and the axial thermal stress are negative. Both the circumferential thermal stress and the axial thermal stress are compressive stresses. When the entrainment speed Increases, the absolute values of the circumferential and axial thermal stresses become larger.
Energy Method on Dynamic Buckling of Cylindrical Shell with Simply-Fixed Supported subjected to Axial Impact of Rigid Mass
Authors: Xin Zhaowei , Han Zhijun 
Published: November 2020

Abstract
Based on the energy method, considering the stress wave effect, the buckling problem of cylindrical shell subjected to impact is studied. Substituting the Lagrange function and the trial function satisfied the boundary condition into the second Lagrange equation. After the second-order linear partial differential equation is obtained, the analytical expression of the critical buckling speed of a rigid mass impacting cylindrical shell is obtained by analyzing the properties of the equations. The influence of critical length, impact mass, axial mode number, circumferential mode number and diameter-thickness ratio on buckling is discussed by analyzing the examples. The results show that the stress wave effect, initial kinetic energy and diameter-thickness ratio have a significant effect on the dynamic buckling of cylindrical shells; the higher-order modes of buckling and the buckling of cylindrical shell are easily motivated by high-speed impact.
Shaking-table test on seismic motion compressed characteristics in a liquefied soil
Authors: Xu Chengshun , Dou Pengfei , Chen Su , Gao Liucheng , Du Xiuli 
Published: November 2020

Abstract
The seismic motion compressed characteristic is a key issue on liquefied soil-structure shaking table model test. A series of shaking table tests were performed to study the seismic motion duration compression characteristics on the dynamic response of liquefied soil. Macroscopic phenomena and dynamic pore water pressure were measured and analyzed. Experimental results showed that the intensity and frequency of seismic motion had a significant influence on the dynamic response of the liquefied soil. Meanwhile, the phenomenon of soil liquefaction and the frequency filtering effects were obvious when inputting longer duration seismic motion. The liquefied soil was more sensitive to the seismic motion, which was compressed according to the predominant frequency of the foundation. In addition, it is suggested that the uncompressed seismic motion was more appropriate on the liquefied soil-structure model in 1g shaking table tests.
Influence of Profile Parameters on Radial Leakage Line Length of Variable Tooth Thickness Scroll Compressor
Authors: Jian-ji WANG , Ya-dong WU , Zhi-chen JING , Bo LIU 
Published: November 2020

AbstractIn order to accurately calculate the radial length of leak line of scroll compressor of variable tooth thickness, with three sections of circle involute type of scroll line as the research object, according to the type line equation to obtain the geometric model of variable tooth thickness radial leakage line length calculation model was set up, numerical solution, through accurate profile parameters was studied (Base circle radius, Connection point, Turning radius, etc.) on the influence of the length of leak line of change. Results show that the model could accurately describe the radial length of leak line of instantaneous change rule, and got the type line parameter change on the influence of the radial length of leak line of law, and the best control the length of leak line type line parameters, providing theoretical basis for reducing radial leakage scroll compressor, at the same time, the model also applies to other type line leak line length calculation.
The Characteristic Frequency Extraction of Helicopter Fault Signal Based on AR Model Estimation
Authors: Niu Penghui , Wang Zhen , Jia Ke , Liu Suyong 
Published: November 2020

Abstract
It is very important to extract the characteristic frequency of helicopter mechanical fault signal, which is directly related to the accuracy of fault diagnosis and the reliability of early fault prediction. The traditional characteristic frequency extraction of fault signal mostly uses the spectrum analysis method based on Fourier analysis. The algorithm of this method is simple, but has high requirements on SNR (signal-to-noise ratio) and sampling time. In this paper, researchers use the AR model spectral estimation method based on the modern spectral estimation theory to study the characteristic frequency extraction of helicopter mechanical fault signal. The simulation results show that the effect is better.
Research and application of quality assurance evaluation method for wind turbines based on operating data
Authors: Li Guanglei , Zhang Yuanpeng , Yuan Shuai , Li Junen , Wang Dehua , Xu Zheng , Wang Yuejiao , Yuan Sen 
Published: November 2020

Abstract
With the rapid development of china wind power, a large number of wind turbines will reach the warranty period in the next few years. As an important part of the acceptance evaluation work, power performance assessment is receiving more and more attention. In order to objectively and efficiently evaluate the power curve performance of wind farm units during the warranty period, this paper uses SCADA data to perform power curve evaluation, develops the evaluation method, and uses wind speed to correct the results. Finally, combined with the actual case of wind farm, the feasibility of this estimation method is verified. The method proposed in this paper provides a basis for conducting wind power quality assurance acceptance.
Remote performance evaluation, life prediction and fault diagnosis of RV reducer for industrial robot
Authors: Zhi Hou , Yangi-Shang  
Published: November 2020

Abstract
For the reason of complex maintenance technology, long maintenance time and large downtime loss, the remote monitoring technology and intelligent diagnosis method are introduced into fault diagnosis of industrial robots; a remote fault diagnosis technology of industrial robots based on intelligent algorithm is proposed. The remote fault diagnosis platform of industrial robot is constructed, and three-layer architecture is designed, which is composed of perception layer, information transmission layer and fault diagnosis layer. RV Reducer of industrial robot is selected as fault diagnosis object, the state information of reducer is collected and processed, the signal processing and feature extraction are carried out by information fusion technology, performance state is evaluated by support vector machine, the remaining life is predicted by grey Markov model, and the potential fault is diagnosed by Bayesian network. The diagnosis results will provide decision support for reducer maintenance, and it will improve the maintenance efficiency, reliability level and user satisfaction.
Function clustering analysis method based on C-Bézier curves
Authors: Shi Mao , Zhang Ruowei 
Published: November 2020

Abstract
With the development of machine learning and big data research, curve clustering analysis has become an important part of multivariate statistics. After analyzing the pros and cons of existing curve clustering methods based on polynomial basis, we present a curve clustering method based on power basis and trigonometric function. Using the L2 norm as a closeness measurement, the C-Bézier curve is introduced into the construction of the curve clustering algorithm to achieve the connection between curve clustering and traditional multivariate statistical clustering methods. As an application, a functional clustering example using the average price of several major foods in 50 cities as the object to verify the results shows that such curves can achieve better clustering results.
Finite Element Simulation of Steel Column Considering Corrosion Morphology
Authors: Li Lvjia , Xu Shanhua 
Published: November 2020

Abstract
This paper carries out the three-dimensional scanning and eccentric compression bearing capacity test of a corroded steel column, which is obtained from the artificial accelerated corrosion test, and through the finite element software, establishes a finite element model considering the true corrosion morphology of the compressed flange and the web to study the effect of corrosion on the ultimate bearing capacity of steel column. The research result shows that the surface of rusted steel is rough, and the stress distribution is uneven. The maximum stress point is often occurred at the bottom of the rust pit, and there is stress concentration at the rust pit. Corrosion causes a significant reduction in the bearing capacity of the steel column. The numerical analysis method considering corrosion morphology can accurately predict the failure mode and ultimate bearing capacity of eccentric compression corroded steel column.
Research on the Framework Design of NQI Service Cloud Platform in the Field of Smart Grid Measurement
Authors: Fang Xu , Liu Yongguang , Wang Yong , Wang Jun 
Published: November 2020

Abstract
The quality control of smart meters exists in production enterprises and power grid companies respectively. Their data are not connected, which leads to the lack of comprehensive control in the whole life cycle of smart meter design, manufacturing and operation scrap, which results in the overall quality level of smart meter industry is limited. The NQI service cloud platform in the field of smart grid measurement takes cloud computing technology as the core and NQI quality service as the process to mine and analyze the quality data of smart meters in the whole life cycle, so as to achieve the overall quality improvement of smart meter industry. In this paper, the service cloud platform architecture is designed by analyzing the service scenario, the quality evaluation index system and the data model of intelligent power meter.
Design of a novel magnetorheological transmission device
Authors: Bilendo Simoni M. , Xuli Zhu 
Published: November 2020

Abstract
This paper presents a new approach in the design of a novel magnetorheological transmission device (MRTD) that employs electromagnetic coil as a part of the stator. MRTD is a torque transmission device which uses magnetorheological fluid (MR fluid) as the transmission medium. MRTD can provide controllable torque and speed by adjusting the external applied magnetic field. The novel MRTD operates under the combination of shear-squeeze mode of MR fluid, which improves the working performance and reduces the adverse effect of centrifugal force. In this study, modes of operation of MR fluids and design parameters of MRTD were described briefly. Next, the material selection was specified, magnetic circuit was conducted, as well as the theoretical torque of MRTD. Finite element analysis was created solving the total magnetic flux density within the MRTD. A prototype MRTD was fabricated, its transmission characteristics were analysed, which mainly included torque transmission and speed control analysis. The results show that torque increases gradually as the current increases, and torque is linear with respect to the input current. The output speed increases significantly with steps of (0.10 A) increment. With further increase, the MRTD can reach synchronous speed. The MRTD shows excellent performance for various application.
Analysis on Stress Corrosion Cracking of Brass Connecting Nut Utilized in Pneumatic Mechanism for 500kV Tank Circuit Breaker
Authors: Chen Hao , Zhang Tao , Wang Yingjun , Zheng Jianjun 
Published: November 2020

Abstract
Circuit breaker is an on-load device that can interrupt load or short-circuit current. Recently, failure of component used in circuit breaker occurs frequently, thus the safety and stability of power grids is severely affected. In this paper, the fracture cause of a brass connecting nut of tank circuit breaker for 500 kV substation was investigated by means of macro-morphology inspection, chemical composition analysis, microstructure analysis, fracture morphology analysis, numerical simulation and energy spectrum analysis. The result showed that the fracture of the brass connecting nut was mainly caused by stress corrosion and stress concentration. Meanwhile the poor mechanical properties due to improper manufacture process, accelerated the development of the stress corrosion cracking of the brass connecting nut.
Design and Calculation of Hydraulic Transmission System of Loader
Authors: Jing Zhou , Qi Han 
Published: November 2020

AbstractIn order to give full play to the power of the engine, it is necessary to find the operating point of the engine and the hydraulic torque converter working together. This paper designs the hydraulic shift system of ZL50 loader with advanced mechanism theory. Firstly, the hydraulic variable speed system of the loader is designed according to the speed and maximum traction of the loader. Then, by calculating the traction characteristics of the loader and the heating of the drive system and evaluating its performance, it provides a reliable theoretical basis for the overall design of the loader.
Dynamic behavior of a breakwater triggered by seepage, earthquake action, and wave pressure
Authors: Lai Jie , Wang You-cai , Liu Yun 
Published: November 2020

Abstract
The dynamic stability analysis of the breakwater is investigated under the actions of seepage, earthquakes, and waves. The research indicates that a non-liquefiable layer is a useful way to prevent the adverse effects of soil liquefaction and to improve the stability of the breakwater. Because of a covering layer of thicker non-liquefied soil, the breakwater will not undergo large liquefied deformation under the coupled actions of seepage, earthquakes, and waves. The dynamic soil pressure response on both sides of the breakwater is more noticeable as the soil depth increases.
Study on the Complete Decarburization of Spring Steel 55SiCrA during Rolling
Authors: Qin Shuchao , Yang Dong , Dong Qing , Huang Cuihuan 
Published: November 2020

Abstract
The rolling test of 55SiCrA spring steel wire rod was carried out with different finishing rolling temperature and laying temperature. The results show that different rolling processes can form different types of complete decarburization. Through temperature measurement and metallographic examination of process samples, it is found that the surface of the rolled piece has formed a complete decarburization layer during the rolling process. However, by setting proper finishing rolling temperature and laying temperature, the deformation heat of high-speed rolling can transform complete decarburization into austenite and avoid complete decarburization of 55SiCrA spring steel wire rod.
Experimental Evidence of Gas Hydrates Dissociation Kinetics by Shifting their Equilibrium Conditions
Authors: Marinakis Dimitris , Varotsis Nikos 
Published: November 2020

Abstract
The scope of this study is to define the rates under which multi-component gas hydrates contained in the pore space of a mud volcanos’ (MV) sediments may decompose in gas and water phase as a result of pressure decrease or temperature increase. Such cases can be encountered during retrieval and handling of pristine samples from the sea floor, or due to an increase of hot mud fluxes from underneath the MV area. Both of the aforementioned shifts of conditions have been studied in the bulk liquid phase of a reactor, while pressure decrease has also been studied in a piston vessel containing artificial sediment at the Centre for Gas Hydrates Research, HW University, Edinburgh.
The results indicate that gas hydrate dissociation progresses much faster with pressure decrease than with temperature increase. Moreover, depressurization at temperatures above 15°C causes higher dissociation rates in comparison to that at lower temperatures.
Characteristic of the Mount Colo Volcano, Una-Una Island, Central Sulawesi Province: Tectonic Evolution and Disaster Mitigation
Authors: Sendjaja Purnama , Suparka Emmy , Abdullah Chalid I. , Sucipta IGB Eddy 
Published: November 2020

Abstract
The Una-Una Island is in the Gulf of Tomini, Central Sulawesi Province. This island is a soliter active volcano island with Mount Colo as volcano name. The island is located between the North Arm and East Arm of Sulawesi, which are having complex tectonic regime, situated between two subduction zones. Volcanic rocks from Una-Una Island are basaltic-trachyandesite until trachydasite composition with magma affinity is calk-alkaline, high-K calk-alkaline and shoshonite. Tectonic reconstruction in this area started at Miocene (15 Ma) where the Celebes Sea Plate subducted below the North Arm of Sulawesi with a gentle slope produced adakite-type volcanic rocks. Along with the continuous subduction process and increasingly steep angle of subduction, the magma source then underwent. Intensive movement of the Banggai-Sula microcontinent, resulted in obduction of the ophiolite during collision, whereas volcanic activity in Una-Una Island and surrounding islands are still ongoing. Recent eruption of the Mount Colo in 1983 produced abundant of pyroclastic material with acid silica and still adakite type composition with mineralogical assemblages consist of hornblende-phlogophite-biotite, gives the impression that it originated from the same magma sources. According to composition of magma and eruption history which were produced magmatic explosion followed by pyroclastic surge, flow and fall, the disaster mitigation focus to eruption forecasting through visual and instrumental monitoring provide by Centre for Volcanology and Geological Hazard Mitigation, Geological Agency, Ministry of Energy and Mineral Resources Republic of Indonesia.
Volcanostratigraphy of Krakatoa Islands, South Lampung District, Lampung Province
Authors: Ismail Taufik , Abdurrachman Mirzam , Rizal Yan , Hardjawidjaksana Kumala 
Published: November 2020

Abstract
The research area is within the territory of Nature Preserve and Marine Preserve region of Krakatoa Islands, South Lampung District, Lampung Province. The study aims to determine the surface geological, mapped on a scale of 1: 20,000, and to determine the geological history that forms the Krakatoa Islands. Volcanostratigraphy is made by combined from literature studied, shoreline analysis, petrographic analysis and field observation. From these results, it is poured into a map of geological outcrops, maps of volcanostratigraphy profiles, geological maps and geological sections. Volcanostratigraphy on the research area is divided into 30 rock units that consists of 22 lava, 8 pyroclastic and allvuial. Geological structure that developed in the research area in the form of secondary structure that is crater and caldera, and the primary structure that is sheeting joinnt, columnar joint, vesicular and autobreccia. New and detailed geological map of Krakatoa volcano is presented.
The nature of ultramafic rocks from Sulawesi, Indonesia and their suitability for CO2 sequestration
Authors: Sufriadin  , Widodo S , Thamrin M , Maulana A , Ito A , Otake T 
Published: November 2020

Abstract
Petrological and geochemical characterization of some ultramafic rock samples from Sulawesi has been conducted with the aim at deciphering physico-chemical properties in relation to their potential use as carbon dioxide storage. Mineralogical analysis was performed by means of optical microscopy and whole rock chemical compositions of the samples were determined by X-ray fluorescence (XRF) spectrometry. Results of analyses show that lizardite is predominant serpentine mineral present, followed by chrysotile and trace amount of magnetite. Remnants of olivine and pyroxene were detected in some samples but they have been pseudomorphically replaced by serpentine. Serpentinization of Sulawesi ultramafic rocks has led to transformation of olivine and lesser pyroxene become secondary phases mainly lizardite and minor chrysotile. This process also has changed the properties of rocks such as reduction in grain size and decreasing in density. Relatively higher MgO concentration combined with fine grained and porous rocks indicate that some Sulawesi ultramafic rocks are good candidate as the host for mineral carbonation. Fosteritic olivine and serpentine (lizardite) are the most soluble Mg-rich minerals in acid. Carbonation may occurs where Mg2+ readily reacts with CO2 forming thermodynamicly stable magnesite (MgCO3)