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surface morphology-optical properties relationship in thermochromic vO_(2) thin films obtained by air oxidation of vanadium nitride

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Journal of Materiomics 2021年第4期7卷 657-664页

作者： A.C.García-Wong D.Pilloud s.Bruyere D.Mangin s.Migot J.F.Pierson F.Capon Institut Jean Lamour(UMR CNRs 7198) Universite de Lorraine54000NancyFrance

In this paper,vanadium nitride(vN)thin films have been deposited on Al substrates by reactive magnetron *** vO_(2) films have been obtained by air oxidation of vN samples performed at three temperatures(450,525 and 550℃)at various durations(lower than 50 min).X-ray diffraction and Raman spectrometry of the vN oxidized films indicate that vO_(2) and v2O5 are the only phases produced during the oxidation *** dioxide is the first oxide *** coexists with vN in a long period at 450℃ or suddenly disappears at 525 and 550℃.Whatever the temperature,v2O5 is exclusively detected after the total oxidation of *** oxide is detrimental to the thermochromic performance of *** emissivity-switching properties of the oxidized films were analyzed by infrared camera in the 7.5e13 mm *** comparison among all the samples exhibiting a thermochromic behavior shows that the maximum emissivity switch is independent of the oxidation temperature and the surface morphology of the *** results could open a new strategy in the investigation of vN oxidation as a method to obtain vO_(2),along with an insight into the correlation between surface morphology and optical properties.

关键词： vanadium dioxide vanadium nitride Thermochromism Optical properties Air oxidation

Multiphysics Analysis for Thermal Management of a 3 Mev, 325 MHz Radio Frequency Quadrupole Accelerator for Indian spallation Neutron source

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Journal of Electromagnetic Analysis and Applications 2019年第5期11卷 55-78页

作者： N. K. sharma C. P. Paul s. C. Joshi G. v. Kane A. Chaturvedi Raja Ramanna Centre for Advanced Technology Indore India Homi Bhabha National Institute Mumbai India

We present multiphysics design studies for thermal management of a 325 MHz 3 Mev Radio Frequency Quadrupole (RFQ) structure for the front end of 1 Gev proton linac for proposed Indian spallation Neutron source (IsNs). Physics design of RFQ for IsNs application has been carried out for 10% (maximum) duty factor. During high power operation of RFQ, RF-induced heating would result in temperature rise, thermal deformations and frequency shift of RFQ from designed values. Therefore thermal management is one of the important design considerations for RFQ development. During design studies, electromagnetic analysis of RFQ cavity is performed to compute RF induced heat fluxes on RFQ surfaces using sUPERFIsH and ANsYs software. simulated results for both codes were compared and found in well agreement. A water cooling scheme has been designed to absorb RF induced heat from RFQ structure. Cooling parameters are optimized by employing univariate search method optimization technique. An RF-Thermal-structural-RF coupled multi-physics analysis methodology is developed to evaluate thermal induced frequency detuning of IsNs RFQ structure. Parametric studies are carried out to investigate the effect of cooling water temperatures on RFQ frequency. Based on analysis results, cooling water temperatures are varied to restore RFQ frequency to designed values. Thus, water cooling will not only remove heat from structure, but it will also be used for online control of resonating frequency during steady state operation of RFQ structure. Results of numerical studies carried out for thermal management of IsNs RFQ are presented in this paper.

关键词： Multiphysics RFQ IsNs ANsYs Electromagnetic Thermal structural Water Cooling Detuning

An Efficient Algorithm for the Numerical Computation of the Complex Eigenpair of a Matrix

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Journal of Applied Mathematics and Physics 2017年第3期5卷 680-692页

作者： R. O. Akinola K. Musa I. A. Nyam s. Y. Kutchin K. v. Joshua Department of Mathematics Faculty of Natural Sciences University of Jos Jos Nigeria

In computing the desired complex eigenpair of a matrix, we show that by adding Ruhe’s normalization to the matrix pencil, we obtain a square nonlinear system of equations. In this work, we show that the corresponding Jacobian is non-singular at the root and that with an appropriately chosen initial guesses, Ruhe’s normalization with a fixed complex vector not only converges quadratically but also faster than the earlier Algorithms for the numerical computation of the complex eigenpair of a matrix. The mathematical tools used in this work are Newton and Gauss-Newton’s methods.

关键词： Quadratic Convergence Newton’s Method

Organic-inorganic bismuth （lll）-based material： A lead- free, air-stable and solution-processable light-absorber beyond organolead perovskites

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Nano Research 2016年第3期9卷 692-702页

作者： Miaoqiang Lyu Jung-Ho Yun Molang Cai Yalong Jiao Paul v. Bernhardt Meng Zhang Qiong Wang Aijun Du Hongxia Wang Gang Liu Lianzhou Wang Nanomaterials Centre School of Chemical Engineering and AIBN The University of Queensland St Lucia Brisbane QLD 4072 Australia school of Chemistry Physics and Mechanical Engineering Science and Engineering Faculty Queensland University of Technology Brisbane QLD 4001 Australia school of Chemistry and Molecular Biosciences The University of Queensland Brisbane 4072 Australia Advanced Carbon Division Institute of Metal Research Chinese Academy of Sciences (IMR CAS) 72 Wenhua Road Shenyang 110016 China

Methylammonium bismuth （III） iodide single crystals and films have been developed and investigated. We have further presented the first demonstration of using this organic-inorganic bismuth-based material to replace lead/tin-based perovskite materials in solution-processable solar cells. The organic-inorganic bismuth-based material has advantages of non-toxicity, ambient stability, and low-temperature solution-processability, which provides a promising solution to address the toxicity and stability challenges in organolead- and organotin-based perovskite solar cells. We also demonstrated that trivalent metal cation-based organic-inorganic hybrid materials can exhibit photovoltaic effect, which may inspire more research work on developing and applying organic-inorganic hybrid materials beyond divalent metal cations （Pb （II） and sn （II）） for solar energy applications.

关键词： methylammoniumbismuth (III) iodide single crystal perovskite solar cells organic-inorganic hybridmaterial lead-free

HPvC-sBR共混型热塑性弹性体相容性研究

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大连理工大学学报 2002年第2期42卷 168-172页

作者：廖明义 v.A.塞尔斯尼奥夫大连理工大学化工学院辽宁大连116012 俄罗斯莫斯科精细化工学院

采用动态硫化方法制备高聚合度聚氯乙烯 (HPvC)和 sBR共混型热塑性弹性体 ,通过性能测试和 Hobbs理论预测 ,研究了单一组分相容剂、二元复合相容剂和交联度对HPvC-sBR共混体系相容性的影响 .结果表明 ,使用复合相容剂和动态硫化均可明... 详细信息

采用动态硫化方法制备高聚合度聚氯乙烯 (HPvC)和 sBR共混型热塑性弹性体 ,通过性能测试和 Hobbs理论预测 ,研究了单一组分相容剂、二元复合相容剂和交联度对HPvC-sBR共混体系相容性的影响 .结果表明 ,使用复合相容剂和动态硫化均可明显改善HPvC-sBR共混物的性能。

关键词：聚氯乙烯丁苯橡胶动态硫化相容剂热塑性弹性体交联度 HPvC-sBR共混物相容性

Hydraulic Reliability Assessment and Optimal Rehabilitation/Upgrading schedule for Water Distribution systems

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Applied Mathematics 2016年第18期7卷 2336-2353页

作者： Wei Peng Rene v. Mayorga Faculty of Engineering University of Regina Regina Canada

This paper develops an innovative approach to optimize a long-term rehabilitation and upgrading schedule (RUs) for a water distribution system with considering both hydraulic failure and mechanical performance failure circumstances. The proposed approach assesses hydraulic reliability dynamically and then optimizes the long-term RUs in sequence for a water distribution system. The uncertain hydraulic parameters are treated as random numbers in a stochastic hydraulic reliability assessment. The methodologies used for optimization in a stochastic environment are: Monte Carlo simulation, EPANET simulation, Genetic Algorithms, shamir and Howard’s Exponential Model, Threshold Break Rate Model and Two-stage Optimization Model. The proposed approach is conducted on a simulation model of water distribution network in a computer by two universal codes, namely the hydraulic reliability code and the optimal RUs code. The applicability of this approach is verified in an example of a benchmark water distribution network.

关键词： Optimization stochastic Water Distribution Rehabilitation Upgrade Hydraulic Re-liability

专著《几何不等式新进展》的补遗(Ⅰ)(英文)

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宁波大学学报（理工版） 1991年第2期4卷 79-145页

作者： Mitrinovic D s Pecaric JE volenec v 陈计 Belgrade大学 Zagreb大学宁波大学数学系

本文综述了专著 AGI 出版后几何不等式的最新进展,尽可能全面地收集了1987—1990年间的有关文献,更多地反映了中国数学家的工作成果。

关键词：几何不等式三角形四边形多边形圆单纯形四面体

磺化二聚顺酐化大豆脂肪酸作为皮革加脂剂的性能

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西部皮革 2014年第4期 45-50页

作者： JANARDHANAN R vIJAYABAsKAR v REDDY B s R 胡雪

分子结构的改变改善了新一代双子表面活性剂的表面活性。研究结果证实它作为功能性化学品,工业应用可以大大减少用量,具有可观的经济利益。评价了新型合成的基于磺化二聚顺酐化大豆脂肪酸(丁二醇为架桥剂)的双子表面活性剂作为皮革加脂... 详细信息

分子结构的改变改善了新一代双子表面活性剂的表面活性。研究结果证实它作为功能性化学品,工业应用可以大大减少用量,具有可观的经济利益。评价了新型合成的基于磺化二聚顺酐化大豆脂肪酸(丁二醇为架桥剂)的双子表面活性剂作为皮革加脂剂的性能。分析测试了加脂剂的化学性能指标,定性和定量研究了加脂效果。sEM研究表明基于双子表面活性剂的加脂剂比传统加脂剂有更好的渗透性。将结果与表面活性剂的乳化能力、zeta电位和粒子尺寸进行了关联,发现它比传统的表面活性剂更好。计算了加脂剂的表面能,发现它们相当。

关键词：加脂剂表面能表面性质水泥外加剂表面活性剂磺化双子聚合二聚

A Tutorial on Common Differential Equations and solutions Useful for Modeling Epidemics Like COvID-19: Linear and Non-Linear Compartmentation Models

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Journal of Applied Mathematics and Physics 2022年第10期10卷 3053-3071页

作者： Robert v. Mulkern Reyhaneh Nosrati Boston Children’s Hospital and Harvard Medical school Boston USA

Purpose: To review some of the basic models, differential equations and solutions, both analytic and numerical, which produce time courses for the fractions of susceptible (s), Infectious (I) and Recovered (R) fractions of the population during the epidemic and/or endemic conditions. Methods: Two and three-compartment models with analytic solutions to the proposed linear differential equations as well as models based on the non-linear differential equations first proposed by Kermack and McKendrick (KM) [1] a century ago are considered. The equations reviewed include the ability to slide between so-called susceptible-Infected-Recovered (sIR), susceptible-Infectious-susceptible (sIs), susceptible-Infectious (sI) and susceptible-Infectious-Recovered-susceptible (sIRs) models, effectively moving from epidemic to endemic characterizations of infectious disease. Results: Both the linear and KM model yield typical “curves” of the infected fraction being sought “to flatten” with the effects of social distancing/masking efforts and/or pharmaceutical interventions. Demonstrative applications of the solutions to fit real COvID-19 data, including linear and KM sIR fit data from the first 100 days following “lockdown” in the authors’ locale and to the total number of cases in the UsA over the course of 1 year with sI and sIs models are provided. Conclusions: COvID-19 took us all by surprise, all wondering how to help. spreading a basic understanding of some of the mathematics used by epidemiologists to model infectious diseases seemed like a good place to start and served as the primary purpose for this tutorial.

关键词： COvID-19 Differential Equations Modelling Compartment Model