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A Novel Synthesis of Difloxacin Hydrochloride

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Chinese Chemical Letters 2001年第10期12卷 875-876页

作者： Dai, ly Chen, YQ Zhejiang Univ Coll Mat & Chem Engn Hangzhou 310027 Peoples R China

Difloxacin hydrochloride, one of aryl-fluoro quinolone antibiotic, has been synthesized in seven steps from 2, 4-dichloro-5-fluoroacetophenone via oxalylation, ethoxymethylenation, amination, cyclization, hydrolysis, ... 详细信息

关键词： difloxacin hydrochloride fluoro quinolone synthesis

SEPARATIoN　CHARACTERISTICS　oF　THE　HYDRoCYCLoNE　WITH　A　CENTRAL　CoNE　AND　ANNULAR　TEETH

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中国有色金属学会会刊：英文版 1996年第4期6卷 11-15页

作者： Chu, ly Chen, WM Luo, Q NoRTHEASTERN UNIV DEPT MINERAL ENGN SHENYANG 110006 PEOPLES R CHINA SICHUAN UNIoN UNIV DEPT CHEM PROC MACHINERY CHENGDU 610065 PEOPLES R CHINA

ＳＥＰＡＲＡＴＩＯＮＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＴＨＥＨＹＤＲＯＣＹＣＬＯＮＥＷＩＴＨＡＣＥＮＴＲＡＬＣＯＮＥＡＮＤＡＮＮＵＬＡＲＴＥＥＴＨ￥ＣｈｕＬｉａｎｇｙｉｎ；ＣｈｅｎＷｅｎｍｅｉ（Ｄｅｐａｒｔｍｅｎｔｏ... 详细信息

ＳＥＰＡＲＡＴＩＯＮＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＴＨＥＨＹＤＲＯＣＹＣＬＯＮＥＷＩＴＨＡＣＥＮＴＲＡＬＣＯＮＥＡＮＤＡＮＮＵＬＡＲＴＥＥＴＨ￥ＣｈｕＬｉａｎｇｙｉｎ；ＣｈｅｎＷｅｎｍｅｉ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｃａｌＰｒｏｃｅｓｓｉ...

关键词： ydrocyclone central cone annular teeth separation sharpness classification efficiency separation characteristics

RoLLING DEFoRMATIoN LAW oF ALUMINIUM ALLoY CLAD SHEET

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中国有色金属学会会刊：英文版 1999年第2期9卷 77-81页

作者： Zhou, HZ Wang, ly Huang, GJ SW Aluminium Fabricat Plant Chongqing 401326 Peoples R China Chongqing Univ Dept Met & Mat Engn Chongqing 400044 Peoples R China

１ＩＮＴＲＯＤＵＣＴＩＯＮＡｌＳｉ／ＡｌＭｎｔｒｉｌａｙｅｒｂｒａｚｅｄｃｌａｄａｌｕｍｉｎｉｕｍｓｈｅｅｔｉｓｔｈｅｍａｉｎｍａｔｅｒｉａｌｆｏｒｍａｋｉｎｇｅｖａｐｏｒａｔｏｒａｎｄｃｏｏｌｅｒｉｎｔｈ... 详细信息

１ＩＮＴＲＯＤＵＣＴＩＯＮＡｌＳｉ／ＡｌＭｎｔｒｉｌａｙｅｒｂｒａｚｅｄｃｌａｄａｌｕｍｉｎｉｕｍｓｈｅｅｔｉｓｔｈｅｍａｉｎｍａｔｅｒｉａｌｆｏｒｍａｋｉｎｇｅｖａｐｏｒａｔｏｒａｎｄｃｏｏｌｅｒｉｎｔｈｅａｉｒｃｏｎｄｉｔｉｏｎｅｒｏｆ...

关键词： aluminium alloyclad sheetrolling deformationdeformation lawcan be divided into 3 stages: free (slip or nonrestraining) deformation stage partial restraining (partial clad) deformation stage full restraining (full clad) deformation stage.

Genetic Algorithms of Structural Fuzzy Reliability Index

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China ocean Engineering 1998年第1期13卷 33-42页

作者： Hu, YC Li, XJ Zhang, ly Tianjin Univ Dept Ocean Engn & Naval Architecture Tianjin 300072 Peoples R China

In this paper the simple generation algorithms are improved. According to the geometric meaning of the structural reliability index, a method is proposed to deal with the variables in the standard normal space. With consideration of variable distribution, the correlation coefficient of the variables and its fuzzy reliability index, the feasibility and the reliability of the algorithms are proved with an example of structural reliability analysis and optimization.

关键词： structural fuzzy reliability index generation algorithm reliability analysis and optimization correlation coefficient normal space

Reliability-Based optimum Design of a Simple offshore Platform Based on Genetic Algorithms

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China ocean Engineering 1998年第1期13卷 43-52页

作者： Zhang, ly Hu, YC Li, XJ Tianjin Univ Dept Ocean Engn & Naval Architecture Tianjin 300072 Peoples R China

In this paper, the problem of reliability-based optimal design of simple offshore platform is studied, and a nonlinear fatigue damage model based on damage mechanics and genetic algorithms are used in the fatigue reliability optimum design of the structure under stochastic wave load. The fatigue damage model and the yield failure reliability analyzing model are used in the paper. The reliability of the models and the effectiveness of genetic algorithm are shown by the results of optimum design.

关键词： damage mechanics genetic algorithms reliability-based optimum design fatigue reliability

A Three-Dimensional Prediction Method for Thermal Diffusion

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China ocean Engineering 1998年第3期13卷 309-321页

作者： Wang, LX Sun, YL Zheng, ly ocean Univ Qingdao Inst Environm Oceanog Qingdao 266003 Peoples R China

A three-dimensional, first order turbulence closure, thermal diffusion model is described in this paper. The governing equations consist of an equation of continuity, three components of momentum, conservation equations for salt, temperature and subgridscale energy, and an equation of state. In the model, according to the hypothesis of Kolmogorov and Prandtl, the viscosity coefficient of turbulent flow of homogeneous fluid is related to the local turbulent energy, and the horizontal and vertical exchange coefficients of mass, heat and momentum are computed with the introduction of subgridscale turbulence energy. The governing equations are solved by finite difference techniques. This model is applied to the Jiaozhou bay to predict thermal pollution by the Huangdao power plant. An instantaneous tidal current field is computed, then the distribution of temperature increment is predicted, and finally the effect of wind stress on thermal discharge is discussed.

关键词： three-dimensional turbulence closure thermal diffusion model finite difference techniques subgridscale energy exchange coefficient temperature increment

Effect of Austenite Ageing on Martensitic Transformation

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Journal of Materials Science & Technology 1997年第6期13卷 508-514页

作者： Chen, QZ Wu, XF Wei, ly Ke, J Univ Sci & Technol Beijing Dept Mat Phys Beijing 100083 Peoples R China

The effect of austenite ageing on martensite transformation in an iron and nickel alloy was studied. Attention was paid to the variation of dislocation configurations in austenite before martensite transformation, The clusters or precipitates produced during austenite ageing and the alteration of dislocation configurations affect together the consequent martensite transformation. Dispersed fine clusters and precipitates cripple nucleus role of special dislocation configurations and drop M-s. Coarse precipitates make M-g rise again. Densely piled up dislocations in nuclei lead to rise of M-s. All the changes in austenite are of benefit to small martensite plates.

关键词： Iron alloys

Using fluorescence surrogates to track algogenic dissolved organic matter(AoM) during growth and coagulation/flocculation processes of green algae

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Journal of Environmental Sciences 2019年第5期31卷 311-320页

作者： Quang Viet ly Mi-Hee Lee Jin Hur Department of Environment & Energy Sejong University

Tracking the variation of the algogenic organic matter(AoM) released during the proliferation of green algae and subsequent treatment processes is crucial for constructing and optimizing control strategies. In this study, the potential of the spectroscopic tool was fully explored as a surrogate of AoM upon the cultivation of green algae and subsequent coagulation/flocculation(C/F) treatment processes using ZrCl_4 and Al_2(So_4)_3. Fluorescence excitation emission matrix coupled with parallel factor analysis(EEM-PARAFAC) identified the presence of three independent fluorescent components in AoM, including protein-like(C1), fulvic-like(C2) and humic-like components(C3). Size exclusion chromatography(SEC) revealed that C1 in AoM was composed of large-sized proteins and aromatic amino acids. The individual components exhibited their unique characteristics with respect to the dynamic changes. C1 showed the highest correlation with AoM concentrations(R^2= 0.843) upon the C/F processes. C1 could also be suggested as an optical predictor for the formation of trihalomethanes upon the C/F processes. This study sheds a light for the potential application of the protein-like component(C1) as a practical surrogate to track the evolution of AoM in water treatment or wastewater reclamation systems involving Chlorella vulgaris green algae.

关键词： EEM-PARAFAC Enhanced coagulation Size exclusion chromatography Algal dissolved organic matter Trihalomethanes

Predicting shear strength of slender beams without reinforcement using hybrid gradient boosting trees and optimization algorithms

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1267-1286页

作者： Thuy-Anh NGUYEN Hai-Bang ly Van Quan TRAN Department of Civil Engineering University of Transport TechnologyHanoi 100000Vietnam

Shear failure of slender reinforced concrete beams without stirrups has surely been a complicated occurrence that has proven challenging to adequately *** primary purpose of this work is to develop machine learning models capable of reliably predicting the shear strength of non-shear-reinforced slender beams(SB).A database encompassing 1118 experimental findings from the relevant literature was compiled,containing eight distinct *** Boosting(GB)technique was developed and evaluated in combination with three different optimization algorithms,namely Particle Swarm optimization(PSo),Random Annealing optimization(RA),and Simulated Annealing optimization(SA).The findings suggested that GB-SA could deliver strong prediction results and effectively generalizes the connection between the input and output *** values and two-dimensional PDP analysis were then carried *** may use the findings in this work to define beam’s geometrical components and material used to achieve the desired shear strength of SB without reinforcement.

关键词： slender beam shear strength gradient boosting optimization algorithms