Methods Dealing with Complexity in Selecting Joint Venture Contractors for Large-Scale Infrastructure Projects by Ru Liang, Zhaohan Sheng, Xiangyu Wang

“…This paper is to study how to select joint venture contractors for undertaking large-scale infrastructure projects based on a multiattribute mathematical model. Two different methods are developed to solve the problem. …”
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Research on Adaptive Friction Compensation of Digital Hydraulic Cylinder Based on LuGre Friction Model by Shouling Jiang, Kun Zhang, Hui Wang, Donghu Zhong, Jinpeng Su, Zengkai Liu

“…This paper aims to eliminate nonlinear friction from the performance of the digital hydraulic cylinder to enable it to have good adaptive ability. First, a mathematical model of a digital hydraulic cylinder based on the LuGre friction model was established, and then a dual-observer structure was designed to estimate the unobservable state variables in the friction model. …”
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Strength Analysis of a Two-Layer PETF-Concrete Column with Allowance for Contact Interaction between Layers by Andrii Velychkovych, Liubomyr Ropyak, Olga Dubei

“…Therefore, the authors’ attention is focused on mechanical and mathematical modeling of the laminated column behavior under operational load. …”
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Influence of Sodium Alginate on Hypoglycemic Activity of Metformin Hydrochloride in the Microspheres Obtained by the Spray Drying by Marta Szekalska, Magdalena Wróblewska, Katarzyna Sosnowska, Katarzyna Winnicka

“…In vitro drug release, mathematical release profile, and physical state of microspheres were also evaluated. …”
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Optimal Pricing of Spectrum Resources in Wireless Opportunistic Access by Hanna Bogucka

“…In the paper, we present mathematical formulation of the problem of finding the optimal taxation rate (common for all nodes) and propose a reduced-complexity algorithm for this optimization. …”
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Coherence Properties and Intensity Distribution of a Partially Coherent Lorentz–Gauss Beam Emerging from the Axicon by Abdu A. Alkelly, Labiba F. Hassan

“…We have derived the intensity equation of a partially coherent Lorentz-Gauss beams propagating through uniform-intensity diffractive axicon, and we proved mathematically that it is the superposition of Bessel beams of various orders after emerging from axicon, using Hermite’s function series and the Bessel function integral formulas. …”
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A Stochastic-Variational Model for Soft Mumford-Shah Segmentation

“…The modeling procedure, mathematical analysis on the existence of optimal solutions, and computational implementation of the new model are explored in detail, and numerical examples of both synthetic and natural images are presented.…”
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IMPACT OF CHEMICAL REACTION ON MHD BOUNDARY LAYER FLOW OF NANOFLUIDS OVER A NONLINEAR STRETCHING SHEET WITH THERMAL RADIATION HAAR WAVELET COLLOCATION METHOD by MAHESH KUMAR N, Vishwanath B Awati, Akash Goravar

“…The nanofluid physical model of the problem comprises with effects of thermophoresis, radiation and chemical reaction parameters. The mathematical model scrutinizes mass, momentum, heat transfer and concentration equations are reduced to couple nonlinear ordinary differential equations over infinite domain using proper similarity variables. …”
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PRE-STRAIN EFFECT EVALUATION OF AUSTENITIC STAINLESS STEEL by LIU XiaoNing, YANG Fan, LIU Cen, WU YuanXiang, LIU Bing, ZHANG HongWei

“…Applying the theory of probability and mathematical statistics,the evaluation system of pre-strain effect was established: the pre-strain effect on the mechanical properties parameter standard deviation was evaluated,using F-distribution; the pre-strain effect on the mechanical properties parameter mean value was evaluate,using t-distribution. …”
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Two-scale convergence analysis and numerical simulation for periodic Kirchhoff plates by Zhiwei Huang, Xiaomiao Zeng, Chen Wang, Chongren Liu

“…Besides, the well-posedness analysis of the PDE is verified by the Lax-Milgram theorem, and the reasonability of the two-scale asymptotic expansion solution by the AHM is mathematically verified through the proof of two-scale convergence. …”
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Optimization Design of Part Tolerance of RV Reducer based on Genetic Algorithm by Xie Xiongwei, Xu Honghai, Guan Tong

“…The backlash is one of the important technical indicators of the RV reducer， and there are many design parameters that affect the backlash. Based on the mathematical model between the part processing feature tolerance and cost， the minimum part processing cost is taken as the target， the allowable backlash(≤1′) and the assembly dimension chain are used as the constraints， and the genetic algorithm is used to optimize the key dimensional tolerances of the RV reducer cycloidal gear， pinwheel， crankshaft and other parts. …”
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Socio-psychological climate of pedagogical collectives of higher educational institutions and innovative readiness in the conditions of modernization of education by Inna B. Avakyan

“…The availability of various techniques and a complex of mathematical and statistical methods for processing the data obtained allowed us to determine the features of the development of innovative readiness and the socio-psychological climate of the pedagogical collectives of universities. …”
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Energy-efficient resource allocation algorithm for massive MIMO OFDMA downlink system by Ying HU, Bao-feng JI, Yong-ming HUANG, Fei YU, Lv-xi YANG

“…An algorithm is proposed for energy-efficient resource allocation scheme in massive MIMO OFDMA downlink mobile communication system.A mathematical formulation of optimization issue is provided with the objective of maximizing system energy efficiency lower bound under the minimum data rate requirement of user,meanwhile the BS uses a zero-forcing(ZF) precoding.And then for optimizing energy efficiency function,the bandwidth allocation,power allocation and the number of antenna arrays at the BS are adjusted synchronously.First,an iterative algorithm derived from optimality condition for bandwidth assignment is proposed.Second,the properties of fractional programming and convex optimization are used to maximize the energy efficiency.Specifically,both the number of antenna arrays at the BS and the transmit data rate at the user are adjusted.Simulation results show that the proposed schemes not only have less iteration number but also have good perform for system energy efficiency and throughput.…”
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SIMSCAPE Electrical Modelling of the IGBT with Parameter Optimization Using Genetic Algorithm by Mohamed Baghdadi, Elmostafa Elwarraki, Naoual Mijlad, Imane Ait Ayad

“…The proposed method is based on the Genetic Algorithm (GA) to perfectly extract and optimize the model parameters using the mathematical model circuit equations and the provided datasheet characteristics. …”
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Performance Prediction of a Synchronization Link for Distributed Aerospace Wireless Systems by Wen-Qin Wang, Huaizong Shao

“…The use of a dedicated synchronization link to quantify and compensate oscillator frequency instability is investigated in this paper. With the mathematical statistical models of phase noise, closed-form analytic expressions for the synchronization link performance are derived. …”
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Study on Temperature Field of Elastic Element of Large Rubber Coupling of Ship by Wang Zhonghou, Wan Pinlei, Zhao Bo

“…For the problem that the finite element simulation analysis of temperature field of large rubber coupling of ships is difficult to convergence because of the large load,the large deformation of rubber piece parts and the nonlinear characteristics of rubber materials,by using the decoupling method,combined with the node equivalence method,the finite element mathematical mode of the rubber material thermal analysis is established theoretically. …”
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BICO MPPT: A Faster Maximum Power Point Tracker and Its Application for Photovoltaic Panels by Hadi Malek, YangQuan Chen

“…This claim has been discussed and proved mathematically in this paper, in addition to simulation illustrations. …”
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STUDY ON MECHANICAL CHARACTERISTICS OF SCRAPER CONVEYOR UNDER CHAIN-BREAKING CONDITION by XIE Miao, YANG RunKun, LU JinNan, WU LongFei

“…In order to study the transient mechanical characteristics of the scraper conveyor’s stuck and broken chain, based on the elastic wave theory, the general equation of the chain longitudinal wave is established considering the resistance of the load, the boundary and initial value conditions are determined, and the mathematical model is analyzed and solved. Using MATLAB software, numerical simulation analysis was carried out on the dynamics of the scraper conveyor under the direct starting conditions and the stuck and broken chain fault conditions. …”
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Design and Dynamics Modeling of a New Two-speed Transmission by Yaogang Li, Shuo Zhang, Jue Yang, Haiyang Long, Chang Liu, Senqi Tan

“…In addition， the basic structure and working principle are introduced， and Lagrange method is applied to analyze the dynamics modeling of each component of the transmission， a two-degree of freedom Lagrange equation is established， the shift process model is built based on MATLAB/Simulink， the shift process is analyzed and the accuracy of the mathematical model is verified. It provides a certain basis for the study on dynamics modeling and shift quality optimization of the same type of transmission.…”
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Multi-objective Optimization Design of RV Reducer Considering the Cycloid Gear Profile Modification by Wang Quan, Zeng Lilei, Qin Zhengzheng

“…In view of the fact that the influence of cycloid gear profile modification on contact force is not taken into account in the structural design of RV reducer，a multi-objective optimization design method for the structure of RV reducer considering cycloid gear profile modification is proposed.Combining the theory of tooth profile modification with the calculation of contact stress of cycloidal gear，considering the factors of volume，efficiency and contact stress，an optimization mathematical model with small volume，high efficiency and low contact stress of cycloidal gear as multi-objective function is established.The solution is carried out by using NSGA-II algorithm，and compared with single-objective optimization method.The results show that compared with the original design，the volume of RV reducer decreases by 21.24%，the efficiency increases by 2.03%，and the contact stress of cycloid wheel decreases by 20.26%.Meanwhile，the multi-objective optimization method has higher comprehensive performance than the single-objective optimization method.…”
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