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Finite Difference Solution of Response Time Delay of Magneto-rhelological Damper

Chinese Journal of Mechanical Engineering 2009年第3期22卷 446-450页

作者： zou Mingsong HOU Baolin School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China

Magneto-rhelological（MR） dampers are devices that employ rheological fluids to modify their mechanical properties. Their mechanical simplicity, high dynamic range, lower power requirements, large force capacity, robustness and safe maimer of operation in cases of failure have made them attractive devices for semi-active real-time control in civil, aerospace and automotive applications. Time response characteristic is one of the most important technical performances of MR dampers, and response time directly affects the control frequency, application range and the actual effect of MR dampers. In this study, one kind of finite difference solution for predicting the response time ofmagneto-rheological dampers from ＂off-state＂ to ＂on-state＂ is put forward. A laminar flow model is used to describe the flow in the MR valve, and a bi-viscous fluid flow model is utilized to describe the relationship of shear stress and shear rate of MR fluid. An explicit difference format is used to diseretize the Novior-Stoks equation, and stability condition of this algorithm is built by Von-Neumann stability criterion. The pressure gradient along the flow duct is solved by a dichotomy algorithm with iteration, and the changing curve of the damping force versus time of MR damper is obtained as well. According to the abovementioned numerical algorithm, the damping forces versus time curves from ＂off-state＂ to ＂on-state＂ of a cylindrical piston type MR damper are computed. Moreover, the MR damper is installed in a material test system（MTS）, the magnetic field in the wire circles of the MR damper is ＂triggered＂ when the MR damper is imposed to do a constant speed motion, and the damping force curves are recorded. The comparison between numerical results and experimental results indicates that this finite difference algorithm can be used to estimate the response time delay of MR dampers.

关键词： magneto-rheological damper response time finite difference method

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Comparison of Advanced Technology Microwave Sounder Biases Estimated Using Radio Occultation and Hurricane Florence(2018) Captured by NOAA-20 and S-NPP

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Advances in Atmospheric Sciences 2020年第3期37卷 269-277页

作者： Xiaoxu TIAN Xiaolei zou Earth Science System Interdisciplinary Center University of Maryland

The second Advanced Technology Microwave Sounder(ATMS)was onboard the National Oceanic and Atmospheric Administration(NOAA)-20 satellite when launched on 18 November *** nearly six months of the earliest NOAA-20 observations,the biases of the ATMS instrument were compared between NOAA-20 and the Suomi National Polar-Orbiting Partnership(S-NPP)*** biases of ATMS channels 8 to 13 were estimated from the differences between antenna temperature observations and model simulations generated from Meteorological Operational(MetOp)-A and MetOp-B satellites’Global Positioning System(GPS)radio occultation(RO)temperature and water vapor *** was found that the ATMS onboard the NOAA-20 satellite has generally larger cold biases in the brightness temperature measurements at channels 8 to 13 and small standard *** observations from ATMS on both S-NPP and NOAA-20 are shown to demonstrate an ability to capture a less than 1-h temporal evolution of Hurricane Florence(2018)due to the fact that the S-NPP orbits closely follow those of NOAA-20.

关键词： ATMS NOAA-20 S-NPP biases calibration Hurricane Florence

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Establishing distinctive theories and methods of design science rooted in Chinese traditional culture

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Frontiers of Mechanical Engineering 2020年第3期15卷 430-437页

作者： Huijun zou Qinghua LIANG School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The human social development saw the formation of five unique civilizations,with the latter forming their own distinctive ***’s traditional culture is its most fundamental ideological weapon for solving *** Chinese are good at comprehensive thinking,dialectical thinking,and systematic *** ideological weapons can solve the problems of formal science and technology and create scientific and technological achievements on par with global advanced *** China is filled with original scientific and technological achievements,which strongly prove ancient China’s possession of its own science and technology different from that of Western ***,a comprehensive understanding of science,technology,experience,and intuition is *** long-held superstition regarding the West,the lack of confidence,self-denial,blind imitation of ideas,and shackles must be thrown *** then can we take the road toward an authentic Chinese creative design as we learn from others.

关键词： traditional Chinese culture comprehensive thinking systematic analysis Needham’s Grand Question ancient Chinese scientific and technological achievements design driving innovation design theoretical thinking design dialectical methods

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China’s alfalfa market and imports: Development, trends, and potential impacts of the U.S.-China trade dispute and retaliations

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Journal of Integrative Agriculture 2020年第4期19卷 1149-1158页

作者： Qingbin WANG zou Yang Department of Community Development and Applied Economics University of VermontBurlingtonVT 05405USA School of Economics Nankai UniversityTianjin 300071P.R.China

This study examines the development and trends of China’s alfalfa market and imports, identifies key factors for the rapid increase in China’s alfalfa imports, and discusses potential impacts of the U.S.-China trade dispute and retaliations on the alfalfa markets and trade in both nations. China’s rapid transition toward larger-scale commercial dairy production, with enhanced feed and cost management as well as quality and safety control, and its limited resources for high-quality alfalfa production are key factors for the dramatic increase in its alfalfa imports, from 19 601 metric tons in 2008 to 1.38 million metric tons(mmt) in 2018. While the United States dominated China’s alfalfa imports with an average share of 97.01% from 2007 to 2017, the share dropped to 83.76% in 2018 and 63.28% in January 2019 due to the trade dispute and retaliations started in 2018. China will likely remain a large importer of alfalfa because of both its growing demand and the comparative advantages of imported alfalfa in quality and price, but the imports from the United States will be highly affected by the ongoing trade dispute and negotiations. China is also expected to make more efforts to reduce its dependence on U.S. alfalfa through increased investment in domestic alfalfa production and identification of alternative sources of alfalfa and other hay imports.

关键词： China’s alfalfa imports U.S.alfalfa exports dairy industrialization U.S.-China trade dispute and retaliations GM-free standards

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Immune regulation in the tumor microenvironment and its relevance in cancer therapy

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Cellular & Molecular Immunology 2022年第1期19卷 1-2页

作者： Weiping zou Department of Surgery Center of Excellence for Cancer Immunology and ImmunotherapyUniversity of Michigan Rogel Cancer CenterAnn ArborMIUSA Department of Pathology Graduate Program in Immunology and Graduate Program in Cancer BiologyUniversity of Michigan School of MedicineAnn ArborMIUSA

Cancer immunotherapy,including immune checkpoint blockade and CAR-T cell therapy,has introduced revolutionary approaches to treating patients with *** success and hope of cancer immunotherapy have continuously stimulated high interest in dissecting immunotherapy resistance mechanisms,researching previously unknown therapeutic targets,and informing novel clinical trials in cancer *** notion that the tumor microenvironment holds the key to understanding tumor immunity and developing novel immunotherapy has been well established in the field of tumor immunology and medical oncology[1].This special issue of Cellular&Molecular Immunology(CMI)compiles a series of review articles,presenting state-ofthe-art literature and concepts focused on several important aspects concerning the most recent advancement in immune sensitive and resistant mechanisms in the tumor microenvironment,and their relevance in cancer therapy.

关键词： cancer immunity Immune

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Recent advances on the synthesis of Sb(Ⅲ)-based inorganic ultraviolet nonlinear optical materials

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Chinese Journal of Structural Chemistry 2023年第1期42卷 74-79页

作者： Gangji Yi Guohong zou College of Chemistry Sichuan UniversityChengdu610064China

Nonlinear optical(NLO)crystals are key components of solid-state lasers and widely used in civilian and military applications.A wide transmission range,a large second harmonic generation(SHG)effect and a suitable bire-fringence are important factors in determining a nonlinear material with excellent *** on ultraviolet(UV)nonlinear optical materials has concentrated on borates,carbonates,and nitrates containing derivative groups,as well as phosphates and sulfates containing tetrahedral groups,as a result of the anionic group theory's *** addition,cations have a significant impact on NLO materials according to recent *** introduction of lone electron pair cations Sb(Ⅲ)has been proven to be an effective strategy by our group,which could modulate the crystal structures of NLO materials to regulate their linear and nonlinear optical *** paper presents a short review of the reported Sb(Ⅲ)-based UV-NLO ***,it gives an overview of the role played by different synthetic methods in the synthesis process of Sb(Ⅲ)-based UV-NLO materials and how to solve the difficult problems including oxidation and *** work will offer some synthetic concepts for investigating the subsequent class of high-performance UV nonlinear materials.

关键词： Ultraviolet nonlinear optical Second harmonic generation Synthetic methods Sb(Ⅲ)-based compounds

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Stronger Version Sensitivity, Almost Finite to One Extension and Maximal Pattern Entropy

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Communications in Mathematics and Statistics 2017年第2期5卷 123-139页

作者： Yong zou School of Mathematical Sciences University of Science and Technology of ChinaHefei 230026AnhuiChina

In this paper,we introduce thickr-sensitivity,multi-r-sensitivity and block thick r-sensitivity for r≥*** first give a characterization of a minimal system which is block thickly *** we obtain a sufficient condition of a minimal system which is thickly *** maximal pattern entropy of a multi-r-sensitive topological dynamical system is also discussed.

关键词： Sensitivity Minimal system Almost finite to one extension Maximal type entropy

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Deep-learning-powered photonic analogto-digital conversion

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Light(Science & Applications) 2019年第1期8卷 611-621页

作者： Shaofu Xu Xiuting zou Bowen Ma Jianping Chen Lei Yu Weiwen zou State Key Laboratory of Advanced Optical Communication Systems and Networks Intelligent Microwave Lightwave Integration Innovation Center(iMLic)Department of Electronic EngineeringShanghai Jiao Tong University200240 ShanghaiChina

Analog-to-digital converters(ADCs)must be high speed,broadband,and accurate for the development of modern information systems,such as radar,imaging,and communications systems;photonic technologies are regarded as promising technologies for realizing these advanced ***,we present a deep-learning-powered photonic ADC architecture that simultaneously exploits the advantages of electronics and photonics and overcomes the bottlenecks of the two technologies,thereby overcoming the ADC tradeoff among speed,bandwidth,and *** supervised training,the adopted deep neural networks learn the patterns of photonic system defects and recover the distorted data,thereby maintaining the high quality of the electronic quantized data succinctly and *** numerical and experimental results demonstrate that the proposed architecture outperforms state-ofthe-art ADCs with developable high throughput;hence,deep learning performs well in photonic ADC *** anticipate that the proposed architecture will inspire future high-performance photonic ADC design and provide opportunities for substantial performance enhancement for the next-generation information systems.

关键词： thereby Deep overcome

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Temperature and Hf-O isotope correlations of young erupted zircons from Tengchong(SE Tibet):Assimilation fractional crystallization during monotonic cooling

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Geoscience Frontiers 2023年第1期14卷 402-414页

作者： Zipei Guo Haibo zou State Key Laboratory of Continental Dynamics Department of GeologyNorthwest UniversityXi'an 710069China Department of Geosciences Auburn UniversityAuburnAL 36849USA

Young zircons from crystal-poor volcanic rocks provide the best samples for the investigations of pre-eruption magmatic processes and for testing a possible relationship between zircon Eu anomalies and crustal *** report trace element chemistry and Hf-O isotope compositions of young zircons from 3 Holocene volcanoes in the Tengchong volcanic field,SE Tibet,in order to provide insights into magma evolution processes and conditions for high-K calc-alkaline volcanic rocks in a post-collisional *** decreasing zircon Ti content and falling temperature,zircon Hf content and Yb/Sm increase whereas zircon Eu anomaly and Th/U decrease,indicating fractional crystallization of plagioclase and zircon during magma *** importantly,zircon Hf isotope ratio(sHf values)increases with decreasing zircon Ti content and falling temperature(T),suggesting gradually increasing incorporation of relatively high EHf juvenile materials in the crystallizing zircons during magma *** correlations between zirconε_(Hf)and zirconδ^(18)O also support open-system magma *** data suggest fractional crystallization of a magma with simultaneous contamination by highε_(Hf)and lowδ^(18)O juvenile(immature)crustal materials during monotonic cooling after zircon *** low-T,high-ε_(Hf)and low-δ^(18)O zircons may indicate the involvement of the early Cretaceous juvenile granitic country rocks during shallow magma *** Eu anomalies in zircons from young Tengchong lavas yield crustal thickness of 40.7±6.8 km,consistent with present crustal thickness(42.5 km)determined by geophysical methods.

关键词： Zircon trace element chemistry Zircon Hf-O isotopes Tengchong volcanoes Continental post-collisional lavas Crustal thickness

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Forecasting of dissolved oxygen in the Guanting reservoir using an optimized NGBM(1,1) model

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Journal of Environmental Sciences 2015年第3期27卷 158-164页

作者： Yan An Zhihong zou Yanfei Zhao School of Economics and Management Beihang University

An optimized nonlinear grey Bernoulli model was proposed by using a particle swarm optimization algorithm to solve the parameter optimization problem. In addition, each item in the first-order accumulated generating sequence was set in turn as an initial condition to determine which alternative would yield the highest forecasting accuracy. To test the forecasting performance, the optimized models with different initial conditions were then used to simulate dissolved oxygen concentrations in the Guantlng reservoir inlet and outlet （China）. The empirical results show that the optimized model can remarkably improve forecasting accuracy, and the particle swarm optimization technique is a good tool to solve parameter optimization problems. What＇s more, the optimized model with an initial condition that performs well in in-sample simulation may not do as well as in out-of-sample forecasting.

关键词： Water quality forecasting Dissolved oxygen Nonlinear grey Bernoulli model Particle swarm optimization Initial condition

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