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Fractional Brownian Motion and Sheet as White Noise Functionals

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Acta Mathematica Sinica,English Series 2006年第4期22卷 1183-1188页

作者： zhi Yuan HUANG chu Jin LI Jian Ping WAN Ying WU Department of Mathematics Huazhong University of Science and Technology Wuhan 430074 P. R. China

In this short note, we show that it is more natural to look the fractional Brownian motion as functionals of the standard white noises, and the fractional white noise calculus developed by Hu and Фksendal follows directly from the classical white noise functional calculus. As examples we prove that the fractional Girsanov formula, the Ito type integrals and the fractional Black-Scholes formula are easy consequences of their classical counterparts. An extension to the fractional Brownian sheet is also briefly discussed.

关键词： Fractional Brownian motion Fractional white noise functionals Fractional Girsanov formula Wick product

Hyper-crosslinked Conjugated Microporous Polymers with Increased Micropores Promotes Confining Polymerization for Electromagnetic Absorption Application

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Chinese Journal of Polymer Science 2023年第8期41卷 1305-1316,I0011页

作者： Hao Chen Fang-Yuan chu Hai-Yan Zhuang Lu Wang zhi-Min Ye Wei Dong zhi-Peng Xie A-Ming Xie School of Mechanical Engineering Nanjing University of Science&TechnologyNanjing 210094China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research Institute(LSMRI)Xiamen 361100China School of Chemistry and Chemical Engineering Nanjing University of Science&TechnologyNanjing 210094China

Conjugated microporous polymers have excellent skeleton structures but poor electrical conductivity limits their applications in microwave *** solve this problem,a strategy of molecular expansion and confining polymerization is proposed in this work to synthesize conductive hyper-crosslinked conjugated microporous *** topology of the conjugated microporous polymer is changed into a three-dimensional skeleton structure with high specific surface area by using molecular expansion technique,and the controlled growth of polypyrrole in the channel constructs a unique network *** balance of excellent composite backbone structure,proper conductivity,attenuation capability and impedance matching enable the material to exhibit electromagnetic wave absorption *** a result,with low filler loading of 10 wt%,a strongest reflection loss of-52.68 d B and a maximum effective bandwidth of 5.76 ***,CST simulations of the radar scattering cross section have been carried out to verify the excellent material *** study provides new concepts for new conductive polymers and broadens the application of hyper-crosslinked conjugated microporous polymer in the field of electromagnetic wave absorption.

关键词： Hyper-crosslinked conjugated microporous polymer Electromagnetic wave absorbing Molecular expansion Polypyrrole

Layout design of a mixed-flow production line based on processing energy consumption and buffer configuration

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Advances in Manufacturing 2021年第3期9卷 369-387页

作者： Cai-Xia Zhang Shu-Lin Dong Hong-Yan chu Guo-zhi Ding zhi-Feng Liu Shi-Yao Guo Chong-Bin Yang Institute of Advanced Manufacturing and Intelligent Technology Beijing University of TechnologyBeijing100124People’s Republic of China Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of TechnologyBeijing100124People’s Republic of China Beijing Xinghang Electromechanical Equipment Co. Ltd.Beijing100074People’s Republic of China School of Mechanical Engineering and Automation Beihang UniversityBeijing100191People’s Republic of China

Green manufacturing is a growing trend,and an effective layout design method for production lines can reduce resource wastage in *** study focuses on existing problems such as low equipment utilization,long standby time,and low logistics efficiency in a mixed-flow parallel production *** reduce the energy consumption,a novel method considering an independent buffer configuration and idle energy consumption analysis is proposed for this production line’s layout design.A logistics intensity model and a machine tool availability model are established to investigate the influences of independent buffer area configuration on the logistics intensity and machine tool *** solve the coupling problem between machine tools in such production lines,a decoupling strategy for the relationship between machine tool processing rates is *** energy consumption model for the machine tools,based on an optimized configuration of independent buffers,is *** model can effectively reduce the idle energy consumption of the machine tools while designing the workshop ***,considering the problems encountered in workshop production,a comprehensive optimization model for the mixed-flow production line is *** verify the effectiveness of the mathematical model,it is applied to an aviation cabin production *** results indicate that it can effectively solve the layout problem of mixed-flow parallel production lines and reduce the idle energy consumption of machine tools during *** proposed buffer configuration and layout design method can serve as a theoretical and practical reference for the layout design of mixed-flow parallel production lines.

关键词： Layout design Energy consumption Mixed flow production line Independent buffer configuration

Achieving strength-ductility synergy in a non-equiatomic Cr_(10)Co_(30)Fe_(30)Ni_(30)high-entropy alloy with heterogeneous grain structures

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Rare Metals 2022年第8期41卷 2864-2876页

作者： Chen-Liang chu Wei-Ping Chen Jun-Chen Liu Qiang Chen zhi-Qiang Fu Guangdong Key Laboratory for Advanced Metallic Materials Processing South China University of TechnologyGuangzhou510641China Southwest Technology and Engineering Research Institute Chongqing400039China

Cold rolling and post-deformation annealing(PDA)heat treatments were used to produce heterogeneous grain structures(HGS)in a single-phase face-centered cubic(fcc)Cr_(10)Co_(30)Fe_(30)Ni_(30)high-entropy alloy(HEA).The microstructural evolution and microstructure-property relationship of the HEA were systematically studied under different *** could be achieved in PDA-treated samples at 875℃for 20 s and at 900℃for 20 s(PDA-900-20 s).PDA-900-20 s sample exhibits the most excellent combination of strength and ductility,showing a tensile yield strength of~590 MPa,an ultimate strength of~706 MPa and a total elongation of~23.9%.Additionally,compared with the homogenized counterpart exhibiting homogenous grains,PDA-900-20 s sample displays a notable increment of~413%in yield strength and simultaneously maintains a good *** dominated strengthening mechanisms in PDA-900-20 s sample are grain-boundary strengthening and heterogeneous deformation-induced(HDI)strengthening,whereas the good ductility is mainly resulted from the HDI ***,the present study provides an effective and simple pathway to overcome the strength-ductility tradeoff of typical fcc HEAs through heterogeneous microstructure.

关键词： High-entropy alloy Heterogeneous grain structures Hetero-deformation-induced hardening Mechanical properties Strengthening mechanism

基于模糊贝叶斯更新的高拱坝施工进度仿真（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2018年第7期19卷 505-520页

作者： Tao GUAN Deng-hua ZHONG bing-yu REN Wen-shuai SONG zhi-qiang chu State Key Laboratory of Hydraulic Engineering Simulation and safety Tianjin University

目的:针对当前高拱坝施工进度仿真研究中施工仿真参数难以实现对现场施工状态的有效跟踪的现状,研究施工仿真参数实时更新方法,以提高施工仿真参数及仿真计算结果的准确度。创新点:1.通过贝叶斯更新方法,建立施工仿真参数实时更新方法;2... 详细信息

目的:针对当前高拱坝施工进度仿真研究中施工仿真参数难以实现对现场施工状态的有效跟踪的现状,研究施工仿真参数实时更新方法,以提高施工仿真参数及仿真计算结果的准确度。创新点:1.通过贝叶斯更新方法,建立施工仿真参数实时更新方法;2.基于模糊集理论,并通过对隶属度的取值,实现对仿真计算过程中施工仿真参数变化的有效模拟。方法:1.通过对高拱坝施工过程的分析(图1),建立高拱坝施工进度仿真的模型(图2和3);2.基于贝叶斯更新方法,建立高拱坝施工仿真参数实时更新方法(公式(4)^(8));3.基于模糊集理论,实现仿真过程中施工仿真参数实时更新;4.将模糊集理论与贝叶斯更新整合,建立模糊贝叶斯更新方法,实现施工仿真参数实时更新(公式(17)和(18));5.将实时更新的施工仿真参数应用到施工进度仿真中,实现施工进度的仿真分析。结论:1.采用贝叶斯更新方法,减小了施工仿真参数与实际参数之间偏差程度;2.采用模糊贝叶斯更新方法,通过不断更新施工仿真参数,使得仿真计算结果与实际施工状态更为接近。

关键词：高拱坝施工仿真贝叶斯更新方法模糊集理论施工仿真参数

Design and synthesis of novel antifungal triazole derivatives with good activity and water solubility

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Chinese Chemical Letters 2013年第4期24卷 303-306页

作者： Xu-Feng Cao Wen-Jing chu Yong-bing Cao Yu-She Yang State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of Sciences School of Pharmacy Second Military Medical University

In order to find novel antifungal agents with good activity and aqueous solubility, a series of SYN-2869 analogues containing a pyridine ring were synthesized and evaluated for their in vitro antifungal activity and water solubility. The results indicated that some compounds showed potent activity against six pathogenic fungi. In particular, the analogue 17a having an isobutyl substitution on the triazolone exhibited significant broad spectrum antifungal activity. In addition, the water solubility of compound l？a was sufficiently improved over SYN-2869.

关键词： SynthesisAntifungalSYN-2869 analoguesTriazoleWater solubility

Sulfonation of 1,4-diaminoanthraquinone leuco by chlorosulfonic acid:Kinetics and process intensification

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Chinese Journal of Chemical Engineering 2023年第6期58卷 163-169页

作者： bing Liu Yingjiao Li Moses Arowo Guangwen chu Yong Luo Liangliang Zhang Haikui Zou Baochang Sun State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China Department of Chemical&Process Engineering Moi UniversityEldoret 3900-30100Kenya

The work herein employed a rotating packed bed(RPB)to intensify the sulfonation process of 1,4-diaminoanthraquinone leuco(DL)in an attempt to improve the yield of the product 1,4-diaminoanthra quinone-2-sulfonic acid(DSA).First,the effects of operating conditions in a stirred tank reactor(STR),including stirring speed,chlorosulfonic acid/DL molar ratio(η),solvent/DL mass ratio(ζ),reaction temperature and dropping speed of chlorosulfonic acid,on the yield of DSA were *** yield of DSA can reach 87.34%under the optimal operating conditions:stirring speed of 500 r·min^(-1),ηof 4.5,ζof 7,reaction temperature of 150℃,dropping speed of 0.61 ml·min^(-1).In addition,the kinetics of the sulfonation process via the shrinking core model revealed that the reaction is controlled by diffusion via a product layer under the reaction temperature of 140℃.Furthermore,the RPB was employed to intensify the mass transfer between liquid and solid phases during the sulfonation reaction *** results showed that the DSA yield of 92.69%obtained by RPB was 5.35%higher than that by STR,indicating that RPB can significantly intensify the mass transfer in the liquid-solid phase sulfonation reaction process.

关键词： Sulfonation 1 4-Diaminoanthraquinone-2-sulfonic acid Kinetics Rotating packed bed(RPB) Chlorosulfonic acid

A NEW TECHNIQUE OF OIL TRANSPORTATION IN PIPELINE BY STEAM INJECTION

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Journal of Hydrodynamics 2002年第4期14卷 1-6页

作者： Lai, Ying-Xu Zheng, zhi-chu Shi, Zai-Hong Wu, Ying-Xiang Inst. of Mech. Chinese Acad. of Sci. Beijing 100080 China

The direct contact heating of crude oil with steam is a promising technique for improving crude oil transportation in pipelines. Crude oil temperature is increased greatly by a small quantity of steam due to the high steam latent heat and direct contact heat transfer. A jet pump was developed for injecting steam into oil in order to get a high efficiency by transferring momentum and energy from a high-velocity jet to ambient fluid. The jet pump was designed based on the free injection principle, which has no rotation parts and no converging mixing chamber, therefore it would not be blocked by the viscous crude oil. The technical feasibility of this method has been tested in the Liaohe Oilfield of China.

关键词： Crude petroleum Heat transfer Jet pumps Steam

Nanofabrication in Polymer Solutions

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应用化学 2001年第5期18卷 259-266页

作者： Tianbo LIU Li zhi LIU Benjamin chu Department of Chemistry State University of New York at Stony BrookStony BrookNY 117903400USA

This review covers recent advances in fabrication of nanomaterials in polymer solutions with emphasis on using the self assembled amphiphilic block copolymers in solution to fabricate organic/inorganic composites with nanoscale modifications. The phase behavior of block copolymers in water and the use of templates to form ordered nanostructures are reviewed in detail. Modern physical techniques for nanoscale characterization are also introduced. The authors suggested that this approach should provide new routes to create materials with interesting morphologies for many different applications.

关键词：聚合物溶液纳米技术胶束纳米结构