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Effects of Operating Conditions on the Catalytic Performance of HZSM-5 Zeolites in n-Pentane Cracking

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China Petroleum Processing & Petrochemical Technology 2021年第1期23卷 67-75页

作者： Hou Xu Zhao Liu Ma zhenzhou Chen Bochong Feng Jingyuan Cui Tingting School of Chemical Engineering Changchun University of TechnologyChangchun 130012 Advanced Institute of Materials Science Changchun University of TechnologyChangchun 130012 Department of Chemistry Tsinghua UniversityBeijing 100084

In this work,n-pentane catalytic cracking over HZSM-5 zeolites was studied at 650°C under atmosphere pressure.A particular attention was paid to the measurement of n-pentane conversion,light olefins production,product distribution,coke deposit,*** indexes were defined to evaluate the effects of operating conditions on the catalytic performance of HZSM-5 *** was found that decreasing the weight hourly space velocity,increasing the reactant partial pressure,and increasing the carrier gas flow rate could inhibit C-H bond breaking and enhance the C-C bond breaking and hydride transfer reactions,leading to reduced alkenes selectivity,which suppressed the formation of external coke and alleviated the deactivation of HZSM-5 *** was deduced that the catalytic stability of HZSM-5 zeolites was improved at the cost of alkenes *** with decreasing the weight hourly space velocity and increasing the reactant partial pressure,increasing the carrier gas flow rate could enhance the diffusion process and protect alkenes from being consumed in coke formation in order to improve the catalytic stability of HZSM-5 zeolites with less reduction of alkenes selectivity.

关键词： operating conditions HZSM-5 zeolites catalytic performance n-pentane cracking light olefins

Grid-Based Path Planner Using Multivariant Optimization Algorithm

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Journal of Harbin Institute of Technology(New Series) 2015年第5期22卷 89-96页

作者： Baolei Li Danjv Lv Xinling Shi zhenzhou an Yufeng Zhang Jianhua Chen School of Information Science and Engineering Yunnan University Oil Equipment Intelligent Control Engineering Laboratory of Henan Provice Physics & Electronic Engineering CollegeNanyang Normal University School of Information Technology and Engineering Yuxi Normal University

To solve the shortest path planning problems on grid-based map efficiently,a novel heuristic path planning approach based on an intelligent swarm optimization method called Multivariant Optimization Algorithm( MOA) and a modified indirect encoding scheme are proposed. In MOA,the solution space is iteratively searched through global exploration and local exploitation by intelligent searching individuals,who are named as atoms. MOA is employed to locate the shortest path through iterations of global path planning and local path refinements in the proposed path planning approach. In each iteration,a group of global atoms are employed to perform the global path planning aiming at finding some candidate paths rapidly and then a group of local atoms are allotted to each candidate path for refinement. Further,the traditional indirect encoding scheme is modified to reduce the possibility of constructing an infeasible path from an array. Comparative experiments against two other frequently use intelligent optimization approaches: Genetic Algorithm( GA) and Particle Swarm Optimization( PSO) are conducted on benchmark test problems of varying complexity to evaluate the performance of MOA. The results demonstrate that MOA outperforms GA and PSO in terms of optimality indicated by the length of the located path.

关键词： multivariant optimization algorithm shortest path planning heuristic search grid map optimality of algorithm

Moment Method Based on Fuzzy Reliability Sensitivity Analysis for a Degradable Structural System

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Chinese Journal of Aeronautics 2008年第6期21卷 518-525页

作者： Song Jun Lu zhenzhou School of Aeronautics Northwestern Polytechnical University Xi'an 710072 China

For a degradable structural system with fuzzy failure region, a moment method based on fuzzy reliability sensitivity algorithm is presented. According to the value assignment of performance function, the integral region for calculating the fuzzy failure probability is first split into a series of subregions in which the membership function values of the performance function within the fuzzy failure region can be approximated by a set of constants. The fuzzy failure probability is then transformed into a sum of products of the random failure probabilities and the approximate constants of the membership function in the subregions. Furthermore, the fuzzy reliability sensitivity analysis is transformed into a series of random reliability sensitivity analysis, and the random reliability sensitivity can be obtained by the constructed moment method. The primary advantages of the presented method include higher efficiency for implicit performance function with low and medium dimensionality and wide applicability to multiple failure modes and nonnormal basic random variables. The limitation is that the required computation effort grows exponentially with the increase of dimensionality of the basic random vari- able; hence, it is not suitable for high dimensionality problem. Compared with the available methods, the presented one is pretty competitive in the case that the dimensionality is lower than 10. The presented examples are used to verify the advantages and indicate the limitations.

关键词： moment method fuzziness sensitivity analysis fuzzy failure probability

Lyapunov exponents for synchronous 12-lead ECG signals

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Chinese Science Bulletin 2002年第21期47卷 1845-1848页

作者： WANG zhenzhou LI Zheng WEI Yixiang NING Xinbao LIN Yuzheng Department of Engineering Physics Tsinghua UniversityBeijing100084China Department of Electronic Science and Engineering Nanjing UniversityNanjing 210093China

The Lyapunov exponents of synchronous 12-lead ECG signals have been investigated for the first time using a multi-sensor (electrode) technique. The results show that the Lyapunov exponents computed from different locations on the body surface are not the same, but have a distribution characteristic for the ECG signals recorded from coronary artery disease (CAD) patients with sinus rhythms and for signals from healthy older people. The maximum Lyapunov exponent L1 of all signals is positive. While all the others are negative, so the ECG signal has chaotic characteristics. With the same leads, L1 of CAD patients is less than that of healthy people, so the CAD patients and healthy people can be classified by L1, L1 therefore has potential values in the diagnosis of heart disease.

关键词： CAD multi-sensor synchronous 12-lead ECG Lyapunov exponents chaos.

Role of Heating Condition in Polyethylene Behaviors under Nitrogen and Air Atmosphere

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China Petroleum Processing & Petrochemical Technology 2022年第1期24卷 27-35页

作者： Zhao Liu Hou Xu Ma zhenzhou Chen Bochong Yuan Enxian Cui Tingting School of Chemical Engineering Changchun University of TechnologyChangchun 130012 Advanced Institute of Materials Science Changchun University of TechnologyChangchun 130012 School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002 Department of Chemistry Tsinghua UniversityBeijing 100084

Recycle of plastic waste is an indisputable means to alleviate both environment and energy *** this work,effects of heating condition on polyethylene behaviors in nitrogen and air were *** was observed that polyethylene behavior was a single step in nitrogen,while the multiple steps occurred in *** to the weight loss and heat flow curves,polyethylene behaviors in air were divided into three regions:low-temperature( 380 ℃) *** analysis revealed that the partial oxidization took the dominance in the low-temperature region,which seldom formed CO and CO_(2);the combustion took the dominance in the middle-temperature region,which was positive to the formation of CO and CO_(2);the pyrolysis was initiated and enhanced in the high-temperature region,which inhibited the formation of CO and CO;.According to the kinetic simulation,a synergistic effect between the pyrolysis and combustion was proposed to account for the acceleration of polyethylene *** work may provide useful information about polyethylene behaviors under heating condition,and help to design and optimize plastic waste incineration process.

关键词： polyethylene heating condition partial oxidation combustion pyrolysis kinetic analysis

Nonlinear Control and Analysis of a Quadrotor with Sling Load in Path Tracking 36

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Nonlinear Control and Analysis of a Quadrotor with Sling Loa...

ACE2/Ang-(1-7) signaling and vascular remodeling

第36届中国控制会议

作者： Chaofan Wu zhenzhou Fu Jia Yang Yiran Wei College of Engineering Bohai University

ISBN: (纸本)9781538629185

The structure of quadrotor with suspended load is widely used in many fields such as military and civilian.A wide range of research in this structure was implemented and have achieved a variety of *** the deeper of research,many problems are urged to be solved under the concern of *** example,the oscillation degree of the suspended *** first,this paper proposed a nonlinear dynamics model of quadrotor with a suspended ***,a proportional plus derivative controller is carried out to realize the trajectory tracking without consideration the vibration of the suspended ***,the simulation results show that the dynamics of the system and performance of path tracking.

关键词： Quadrotor slung load path tracking nonlinear model coupling

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Science China(Life Sciences) 2014年第8期57卷 802-808页

作者： ZHANG zhenzhou CHEN LaiJiang ZHONG JiuChang GAO PingJin OUDIT Gavin Y. State Key Laboratory of Medical Genomics Ruijin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai Key Laboratory of Hypertension Shanghai Institute of Hypertension Department of Medicine University of Alberta Mazankowski Alberta Heart Institute

The renin-angiotensin system(RAS)regulates vascular tone and plays a critical role in vascular remodeling,which is the result of a complex interplay of alterations in vascular tone and *** of the RAS has led to important pharmacological tools to prevent and treat vascular diseases such as hypertension,diabetic vasculopathy and *** converting enzyme 2(ACE2)was recently identified as a multifunctional monocarboxypeptidase responsible for the conversion of angiotensin(Ang)II to Ang-(1-7).The ACE2/Ang-(1-7)signaling has been shown to prevent cellular proliferation,pathological hypertrophy,oxidative stress and vascular ***,the ACE2/Ang-(1-7)signaling is deemed to be beneficial to the cardiovascular system as a negative regulator of the *** addition of the ACE2/Ang-(1-7)signaling to the complexities of the RAS may lead to the development of novel therapeutics for the treatment of hypertension and other vascular *** present review considers recent findings regarding the ACE2/Ang-(1-7)signaling and focuses on its regulatory roles in processes related to proliferation,inflammation,vascular fibrosis and remodeling,providing proof of principle for the potential use of ACE2 as a novel therapy for vascular disorders related to vascular remodeling.

关键词： angiotensin converting enzyme 2 inflammation vascular remodeling angiotensin II oxidative stress

Compact Oxygen Sensor for Motorcycles Concept of Simple Heaterless Sensors

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Compact Oxygen Sensor for Motorcycles Concept of Simple Heat...

A new perspective of triptolide-associated hepatotoxicity:the relevance of NF-κB and NF-κB-mediated cellular FLICE-inhibitory protein

2014中国汽车工程学会年会

作者： Hodaira Kinji Watarai Takehiro Su zhenzhou DENSO Corporation DENSO (China) Investment Co. Ltd.

ISBN: (纸本)9783662450420

The concept and evaluation results of the compact heaterless O sensor(activated with exhaust gas heat) that is suitable for the FI(Fuel Injection) system for small motorcycles are *** realize the heaterless,low temperature operation at280℃ is achieved by using high ion conductive solid electrolytes and low interface resistance electrodes,and the element temperature could be kept to 350℃ and above during an actual vehicle EC mode driving by a small-thin element and a high heat receiving *** a result,early rises in temperature and early activation with the heaterless O sensor are made possible at engine cold starting.

关键词： oxygen sensor motorcycle FI system

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Acta Pharmaceutica Sinica B 2020年第5期10卷 861-877页

作者： Ziqiao Yuan Zihang Yuan Muhammad Hasnat Haoran Zhang Peishi Liang Lixin Sun zhenzhou Jiang Luyong Zhang Jiangsu Key Laboratory of Drug Screening China Pharmaceutical UniversityNanjing 210009China Center for Drug Research and Development Guangdong Pharmaceutical UniversityGuangzhou 510006China Jiangsu Center for Pharmacodynamics Research and Evaluation China Pharmaceutical UniversityNanjing 210009China Key Laboratory of Drug Quality Control and Pharmacovigilance(China Pharmaceutical University) Ministry of EducationNanjing 210009China State Key Laboratory of Natural Medicines China Pharmaceutical UniversityNanjing 210009China Institute of Pharmaceutical Sciences University of Veterinary and Animal SciencesLahore 54000Pakistan College of Traditional Chinese Medicine Guangdong Pharmaceutical UniversityGuangzhou 510006China

Previously,we proposed a new perspective of triptolide(TP)-associated hepatotoxicity:liver hypersensitivity upon lipopolysaccharide(LPS)***,the mechanisms for TP/LPSinduced hepatotoxicity remained *** present study aimed to clarify the role of LPS in TP/LPS-induced hepatotoxicity and the mechanism by which TP induces liver hypersensitivity upon LPS ***-αinhibitor,etanercept,was injected intraperitoneally into mice to investigate whether induction of TNF-αby LPS participated in the liver injury induced by TP/LPS *** and hepatocytes pretreated with TP were stimulated with recombinant TNF-αto assess the function of TNF-αin TP/LPS ***,time-dependent MF-κB activation and NF-κB-mediated pro-survival signals were measured in vivo and in ***,overexpression of cellular FLICEinhibitory protein(FLIP),the most potent NF-κB-mediated pro-survival protein,was measured in vivo and in vitro to assess its function in TP/LPS-induced *** counteracted the toxic reactions induced by TP/***-treatment sensitized mice and hepatocytes to TNF-α,revealing the role of TNF-αin TP/LPS-induced *** studies revealed that TP inhibited NF-κB dependent pro-survival signals,especially FLIP,induced by LPS/TNF-α.Moreover,overexpression of FLIP alleviated TP/LPS-induced hepatotoxicity in vivo and TP/TNF-α-induced apoptosis in *** and hepatocytes treated with TP were sensitive to TNF-α,which was released from LPS-stimulated immune *** and other results show that the TP-induced inhibition of NF-κB-dependent transcriptional activity and FLIP production are responsible for liver hypersensitivity.

关键词： Triptolide LPS TNF-x NF-KB FLIP