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Test Verification and Design of the Bicycle Frame Parameters

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Chinese Journal of Mechanical Engineering 2015年第4期28卷 716-725页

作者： ZHANG Long xiang Zhongxia LUO Huan TIAN Guan Key Laboratory of Mechanism Theory and Equipment Design of Education Tianjin University

Research on design of bicycles is concentrated on mechanism and auto appearance design, however few on matches between the bike and the rider. Since unreasonable human-bike relationship leads to both riders＇ worn-out joints and muscle injuries, the design of bicycles should focus on the matching. In order to find the best position of human-bike system, simulation experiments on riding comfort under different riding postures are done with the lifemode software employed to facilitate the cycling process as well as to obtain the best position and the size function of it. With BP neural network and GA, analyzing simulation data, conducting regression analysis of parameters on different heights and bike frames, the equation of best position of human-bike system is gained at last. In addition, after selecting testers, customized bikes based on testers＇ height dimensions are produced according to the size function. By analyzing and comparing the experimental data that are collected from testers when riding common bicycles and customized bicycles, it is concluded that customized bicycles are four times even six times as comfortable as common ones. The equation of best position of human-bike system is applied to improve bikes＇ function, and the new direction on future design of bicycle frame parameters is presented.

关键词： bike modeling data mining fatigue dynamics simulation oxygen uptake

Spectrum and Spectral Singularities of a Quadratic Pencil of a Schr?dinger Operator with Boundary Conditions Dependent on the Eigenparameter

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Acta Mathematica Sinica,English Series 2023年第11期39卷 2164-2180页

作者： xiang ZHU Zhao Wen ZHENG Kun LI School of Mathematical Sciences Qufu Normal UniversityQufu 273165P.R.China College of Mathematics and Systems Science Guangdong Polytechnic Normal UniversityGuangzhou 510665P.R.China

In this paper,we consider the following quadratic pencil of Schr?dinger operators L(λ)generated in L~2(R~+)by the equation−y″+[p(x)+2λq(x)]y=λ^(2)y,x∈R^(+)=[0,+∞)with the boundary condition y′(0)/y(0)=β_(1)λ+β0-α_(1)λ+α0,where p(x)and q(x)are complex valued functions andα_(0),α_(1),β_(0),β_(1)are complex numbers withα_(0)β_(1)-α_(1)β_(0)≠*** is proved that L(λ)has a finite number of eigenvalues and spectral singularities,and each of them is of a finite multiplicity,if the conditions p(x),q′(x)∈AC(R^(+)),limx→∞[|p(x)|+|q(x)|+|q′(x)|]=0 and sup 0≤x0.

关键词： Schrodinger operator Strum-Liouville problems finite spectrum eigenparameter dependence

Compositional and geochemical characteristics of light hydrocarbons for typical marine oils and typical coal-generated oils in China

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Chinese Journal Of Geochemistry 2008年第4期27卷 407-411页

作者： WANG xiang ZHANG Min Department of Geochemistry Yangtze University Jinzhou 434023 China The Key Laboratory of Oil ＆ Gas Resources and Exploration Technology Ministry of Education Yangtze University Jinzhou 434023 China

Different types of crude oils have different light hydrocarbon compositional and geochemical character-istics. Based on the light hydrocarbon data from two kinds of oils,i.e.,coal-generated oils and marine oils in China,light hydrocarbons in marine oils in the Tazhong area are generally relatively enriched in n-heptane,and coal-generated oils from the Turpan Basin are enriched in methylcyclohexane . The K1 values,reported by Mango (1987),range from 0.97 to 1.19 in marine oils,basically consistent with what was reported by Mango on light hy-drocarbons in terms of the majority of the crude oil data. But the K1 values of coal-generated oils are particularly high (1.35-1.66) and far greater than those of marine oils; heptane values in marine oils,ranging from 32.3% to 45.4%,and isoheptane values,ranging from 1.9 to 3.7,are respectively higher than those of coal-generated oils,in-dicating that the oils are in the high-maturity stage. In addition,expulsion temperatures of coal-generated oils from the Turpan Basin are obviously lower than those of marine oils from the Tazhong area.

关键词：中国海上石油煤油碳水化合物参数

Decentralized Counterparty Matches and Automatic Settlement of Interest Rate Swap Through Blockchain’s Smart Contracts

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国际计算机前沿大会会议论文集 2022年第2期 437-447页

作者： Jian Zhao Jinjing Liu Hua Wang lin lin Shaohua xiang College of Big Data and Internet Shenzhen Technology UniversityShenzhen 518118GuangdongChina FinTech Research Center Business SchoolShenzhen Technology UniversityShenzhen 518118GuangdongChina

Interest Rate Swap(IRS)is the most vivid application of the principle of comparative advantage in the financial *** effectiveness of interest rate swap in managing interest rate risk has been widely ***,the traditional interest rate swap transaction is ***,there usually existmarket risks and credit *** alleviate risks and cost,and improve liquidity of interest rate swap,this paper proposes a smart contract basedmatching platform for interest rate swap of real fiat *** contracts play a key role for sharing data among participants,which can not be forged or tampered *** our design,an efficient peer-to-peer counterparty matching method on the chain is *** whole trading process of interest rate swap is carried out on the blockchain,which has higher security.A prototype based on smart contracts running on Ethereum is implemented and validates our design.

关键词： Ethereum Smart contract Interest rate swap DeFi

Field investigation of intelligent compaction for hot mix asphalt resurfacing

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Frontiers of Structural and Civil Engineering 2017年第1期11卷 47-55页

作者： Wei HU xiang SHU Baoshan HUANG Mark WOODS Department of Civil and Environmental Engineering The University of Tennessee Knoxville TN 37996 USA Division of Materials and Tests Tennessee Department of Transportation 6601 Centennial Blvd. Nashville TN 37243 USA

Intelligent compaction （IC） is a relatively new technology for asphalt paving industry. The present study evaluated the effectiveness and potential issues of the IC technology for flexible pavement resurfacing construction using two field projects. In the first project, a geostatistical semivariogram model was established and the parameters derived from it were compared with univariate statistical parameters for the Compaction Meter Value （CMV） data. Further analyses illustrated the effect of temperature on the CMV value and compaction uniformity. In the second project, a multivariate analysis was performed between in situ tests and IC data. The possibility of combining various IC data to predict the asphalt layer density and improve the current quality control and assurance system was discussed.

关键词： intelligent compaction compaction meter value (CMV) semivariogram multivariate analysis

Relationship between COX-2 and cell cycle-regulatory proteins in patients with esophageal squamous cell carcinoma

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World Journal of Gastroenterology 2010年第47期16卷 5975-5981页

作者： Jun-Xing Huang Mao-Song lin Yun-Lei Zhang Feng-Yue Li Rong-Yu Qian Wei-Chang Chen Zheng-xiang Song Ping Chen Eeva Salminen Department of Oncology the People’s Hospital of TaizhouTaizhou Medical SchoolYangzhou and Nantong UniversityTaizhou 225300Jiangsu ProvinceChina Department of Pathology The People’s Hospital of TaizhouTaizhou Medical SchoolYangzhou and Nantong UniversityTa izhou 225300Jiangsu ProvinceChina Depar tment of Gastroenterology The First Affiliated Hospital of Soochow UniversitySuzhou 215006 Jiangsu ProvinceChina Department of Radiotherapy and Oncology Turku University HospitalTurkuand Finnish Radiation ProtectionAgency (STUK) FinlandPOBox 5220521 TurkuFinland

AIM: To investigate the correlation between cyclooxygenase-2 (COX-2) and cell cycle-regulatory proteins in patients with esophageal squamous cell carcinoma (ESCC). METHODS: One hundred and two surgically obtained specimens of ESCC were randomly collected. All specimens were obtained from patients who had not received chemoor radiotherapy prior to surgical ***-eight specimens of normal squamous epithelium served as controls. The expression of COX-2, Ki-67, cyclin A and p27 was examined by immunohistochemistry. The Pearson test was used to analyze the relationship between groups. RESULTS: The protein level of COX-2, Ki-67 and cyclin A was significantly higher in ESCC than in normal squamous epithelium (74.7±61.2 vs 30.2 ± 43.4, 64.0 ± 51.6 vs 11.6 ± 2.3, 44.2 ± 32.2 vs 11.7 ± 5.0, respectively, all Plin A and p27 expressions were correlated with the tumor differentiation (43.8±31.7 vs 98.4± 84.8, 32.0 ± 19.0 vs 54.1 ±53.7,206.2±61.5 vs 123.5±68.3, respectively, all Plin A and negatively correlated to p27 expression in ESCC (r=0.270, 0.233 and-0.311, respectively, all P<0.05).CONCLUSION: The expression of COX-2 is correlated with tumor cell invasion and is closely related to the cell proliferation in patients with ESCC.

关键词： Esophageal squamous cell carcinoma Cyclooxygenase-2 Ki-67 Cyclin A p27 Tumor markers Immunohistochemistry

Non-Semisimple Lie Algebras of Block Matrices and Applications to Bi-Integrable Couplings

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Advances in Applied Mathematics and Mechanics 2013年第5期5卷 652-670页

作者： Jinghan meng Wen-Xiu Ma Department of Mathematics and Statistics University of South FloridaTampaFL 33620-5700USA

We propose a class of non-semisimple matrix loop algebras consisting of 3×3 block matrices,and form zero curvature equations from the presented loop algebras to generate bi-integrable *** are made for the AKNS soliton hierarchy and Hamiltonian structures of the resulting integrable couplings are constructed by using the associated variational identities.

关键词： Bi-integrable couplings non-semisimple matrix loop algebras AKNS hierarchy Hamiltonian structure symmetry

Cage-like radiotherapy system for noncoplanar radiotherapy

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Nuclear Science and Techniques 2021年第2期32卷 1-10页

作者： Chuan-meng Niu Ming-Hui Li Jian-Rong Dai Department of Radiation Oncology National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China

The aim of this study was to design a cage-like radiotherapy system(CRTS)to further promote the clinical application of noncoplanar *** CRTS comprises two stands,two O-rings,several arc girders,an X-ray head,an imaging subsystem,and a treatment *** X-ray head rotates with O-rings around the patient’s body and slides along the arc *** with the C-arm linear accelerator(C-linac),the clinically available spatial irradiation angle ranges(SIARs)of the CRTS for the head,chest,and abdomen were 33%,63.6%,and 62.6%larger,***,according to a preliminary planning comparison based on the dose distribution simulation method,the CRTS achieved much better protection of normal tissue than the ***,the CRTS enabled accurate noncoplanar irradiation without movement of the body being irradiated,allowed automatic control of the movements of different parts without risk of collisions,and provided continuous radiation over an angle that considerably exceeded a full *** advantages make CRTS very promising for noncoplanar radiotherapy.

关键词： Radiotherapy system Noncoplanar radiotherapy Spatial irradiation angle range Spherical surface area

Mechanical analysis and reasonable design for Ti-Al alloy liner wound with carbon fiber resin composite high pressure vessel

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第3期10卷 384-391页

作者： Chuan-xiang ZHENG Fan YANG Ai-shi ZHU Chemical Process Machinery Institution Zhejiang University Hangzhou 310027 China School of Biological and Chemical Engineering Zhejiang University of Science and Technology Hangzhou 310012 China

To consider the internal pressure loaded by both the cylindrical Ti-Al alloy liner and the carbon fiber resin composite (CFRC) wound layers, two models are built. The first one is a cylinder loaded with the internal pressure in the hoop direction only. In this model, the total hoop direction load is distributed over all layers under the internal pressure. The second one is a cylinder loaded with the internal pressure in the axial direction only. In this model, the total axial load is distributed over all cylinders under the internal pressure. Taking the boundary conditions of the continuous displacement between layers into account, a group of equations are built. From these equations, we get the solutions of stresses in both hoop direction and axial direction loaded by every layer under internal pressures. After the stresses are obtained, a reasonable design can be done. An example is given in the final section of this study.

关键词： Mechanical analysis Composite Pressure vessel Models