Dip Angle Effect on the Main Roof First Fracture and Instability in a Fully-Mechanized Workface of Steeply Dipping Coal Seams by Zhen Wei, Ke Yang, Xiaolou Chi, Wenjie Liu, Xinyuan Zhao

“…The fracture instability mechanism of the basic roof is the key to support selection and surrounding rock stability control, and it is also the guarantee of safe and efficient coal mining. …”
Get full text

Stress-strain state of a combined toroidal baromembrane apparatus by S. I. Lazarev, О. V. Lomakina, V. Е. Bulanov, I. V. Khorokhorina

“…Therefore, the task of developing an engineering method for calculating baromembrane devices is a challenge. Studies on methods involving calculation of design and process variables, membrane equipment design, research of technological features of membrane devices, selection of design schemes, as well as methods of strength and rigidity analysis, are investigated.Materials and Methods. …”
Get full text

Comparative analysis of statistical software products for the qualifying examination of plant varieties suitable for dissemination by Н. В. Лещук, К. М. Мажуга, Н. С. Орленко, Є. М. Стариченко, Є. А. Шкапенко

“…To substantiate the selection of software for proces­sing statistical data relative to field and laboratory investigations that are included into the qualifying examination for VSD. …”
Get full text

Study on the influence of mining sequence and depth on slope stability of end slope in open-pit mines by Zhongxin WANG, Zhongchao CAI, Dong WANG

“…We put forward the calculation formula of coal pillar stress under sequential mining and jumping mining, and use FLAC3D software to calculate and analyze the coal pillar stability under the two methods, and study the slope stability under different mining tunnel depths in the limit state of mining. …”
Get full text

THE DEVELOPMENT OF A BASIC PROCESS SCHEME FOR THE PREPARATION OF ISOAMYL ACETATE by S. L. Nazanskiy, M. S. Glukhova

“…It was proved by comparison of deviations of the calculated temperature and vapor mole fractions from the experimental values that NRTL is the best model for the considered mixture phase equilibrium calculations. …”
Get full text

PERILAKU DAN LOYALITAS KONSUMEN MADU DI KOTA BENGKULU by Selmi Selmi, Putri Suci Asriani, Rustama Saepuddin

“…The calculation results show that in general consumers of honey was categorized satisfied (0.61 <CSI ? …”
Get full text

Degradation modeling of degradable copolymers for biomimetic scaffolds by Taohong Zhang, Yue Gao, Lingling Zhu, Qingfeng Zeng, Ming Zhou

“…The diffusion of the oligomers was then calculated using the macro diffusion equation, and the degradation process of the copolymer was simulated by three-scale coupling calculations. …”
Get full text

Numerical simulation study of tunneling process using TBM disc cutter under extremely hard rock condition by Huawei WANG, Zhengyang KANG, Yingcai WANG, Sijin LIU, Peng LIU

“…In terms of efficiency, the time spent on calculations and solving increased with higher values of λ in the FEM. …”
Get full text

FORMATION OF MODERN MATHEMATICAL APPROACH TO SOLVING PROBLEMS OF PHYSICS by Тетяна Обіход

“…The comparison of two approaches to the description of Calabi-Yau manifold as a complex manifold and as weighted projective space led us to the conclusion about the equivalence of these two treatments in the context of calculation of the Euler characteristic. As Euler’s characteristic for elementary particle physics is the number of generations of quarks and leptons, the selection of Calabi-Yau manifolds with appropriate topological properties is one of the urgent problems of modern physics. …”
Get full text

Modeling and analysis of tooth deviations for manufacturing gears using power skiving by GUO Erkuo, LIU Chang, LIU Shulong, YUAN Yayun

“…A methodology was suggested for controlling tooth deviations through optimal selection of the number of tool teeth.ResultsNumerical calculation and test results show that this method can significantly reduce the circular errors on gear tooth surface.…”
Get full text

Outlier detection algorithm based on fast density peak clustering outlier factor by Zhongping ZHANG, Sen LI, Weixiong LIU, Shuxia LIU

“…For the problem that peak density clustering algorithm requires human set parameters and high time complexity, an outlier detection algorithm based on fast density peak clustering outlier factor was proposed.Firstly, k nearest neighbors algorithm was used to replace the density peak of density estimate, which adopted the KD-Tree index data structure calculation of k close neighbors of data objects, and then the way of the product of density and distance was adopted to automatic selection of clustering centers.In addition, the centripetal relative distance and fast density peak clustering outliers were defined to describe the degree of outliers of data objects.Experiments on artificial data sets and real data sets were carried out to verify the algorithm, and compared with some classical and novel algorithms.The validity and time efficiency of the proposed algorithm are verified.…”
Get full text

Networks Based on Graphs of Transient Intensities and Product Theorems in Their Modelling by Gurami Tsitsiashvili

“…Both models are based on the selection of states, between which additional transient intensities are introduced. …”
Get full text

Higher-order Aberrations — the Choice of Optimal Intraocular Correction in the Surgical Treatment of Cataracts. Review of the Literature by D. A. Khvan, G. A. Fedyashev

“…Understanding and assessing wavefront errors in IOL selection and calculation is great importance to achieve maximum optical outcome in the postoperative period. …”
Get full text

Analysis of Load Sharing Performance of Planetary Gear Reducer in Electric Vehicle Hub Motor by Zhang Jiang, Qing Xunpeng, Chen Haoran

“…As for the floating planetary gear reducer in hub motor,a dynamics equation of dual floating planetary transmission system is established,and then the calculation formula of load sharing coefficient is deduced. …”
Get full text

Analysis of the Stiffness Characteristic of Three Types of Four-bar Flexure Hinge Mechanism based on ANSYS by Wang Chengtao, Wang Yuqiao, Yang Xuefeng, Liu Yufei, Wei Huaxian, Sheng Lianchao

“…Aiming at three types of single parallel four-bar flexure hinge mechanisms,the theoretical calculation of stiffness is carried out,then,the mechanisms are analyzed by the finite element software ANSYS 12. 0. …”
Get full text

ELASTIC AND DISSIPATIVE MATERIAL PROPERTIES DETERMINATION USING COMBINATION OF FEM AND COMPLEX ARTIFICIAL NEURAL NETWORKS by Arkady Nikolayevich Solovyev, Truong Giang Nguyen Duy

“…The process of displacement measurement is simulated using the calculation of finite elements software ANSYS, the building of the amplitude-frequency characteristics (AFC) of the displacement, and of the selection of their values for a set of frequencies (frequency measurement). …”
Get full text

Outlier detection algorithm based on fast density peak clustering outlier factor by Zhongping ZHANG, Sen LI, Weixiong LIU, Shuxia LIU

“…For the problem that peak density clustering algorithm requires human set parameters and high time complexity, an outlier detection algorithm based on fast density peak clustering outlier factor was proposed.Firstly, k nearest neighbors algorithm was used to replace the density peak of density estimate, which adopted the KD-Tree index data structure calculation of k close neighbors of data objects, and then the way of the product of density and distance was adopted to automatic selection of clustering centers.In addition, the centripetal relative distance and fast density peak clustering outliers were defined to describe the degree of outliers of data objects.Experiments on artificial data sets and real data sets were carried out to verify the algorithm, and compared with some classical and novel algorithms.The validity and time efficiency of the proposed algorithm are verified.…”
Get full text

Influence of Tooth Profile Parameter of Double-circle-arc Flexspline on Conjugate Characteristic of Harmonic Gear Drive by Anfu Yuan, Shengfeng Qiu, Xukai Shi

“…The obliquity and length of common tangent have significant influence on the conjugate zone and arc length of conjugate tooth profile. Reasonable selection of flexspline profile parameters can effectively improve the transmission performance of harmonic gear device.…”
Get full text

Matching Design and Simulation Analysis for Two-speed Transmission of Electric Vehicle by Yu Chen, Kun Yang, Jiaming Zhou, Yong Fang, Youtang Wang, Jie Wang

“…The related research can provide a reference for the selection of the electric vehicle power transmission system.…”
Get full text

Error performance of multi-branch dual-hop PF cooperative systems by Guangqiu LI, Jiayun DONG, Tao JIANG

“…Design of multi-branch dual-hop phase-only forward(PF)cooperative systems with continuous phase frequency shift keying(CPFSK)modulation needs to determine the number of branch and modulation index.The usual solution of determining the above parameters is the time-consuming and inefficient computer simulation.An efficient solution of determining these parameters is theoretical analysis method.Semi-analytical expressions for the average bit error rate(ABER)of multi-branch dual-hop PF cooperative systems in conjunction with discrimination detection CPFSK over time-selective Rayleigh fading channels was presented.Two cases with and without antenna selection at the relays and maximum-ratio combining(MRC)receive diversity at the destination were considered.The simulation results show that numerical calculation results and simulation results for the ABERs of PF，discrimination detection,CPFSK cooperative systems are consistent and show that the above ABER theory results of CPFSK cooperative systems can be used to design PF cooperative systems.…”
Get full text