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Defining region-specific heatwave in China based on a novel concept of “avoidable mortality for each temperature unit decrease”

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Advances in Climate Change Research 2021年第5期12卷 611-618页

作者： LIU Jiang-Mei ai si-qi qi Jin-Lei WANG Li-Jun ZHOU Mai-Geng WANG Chong-Jian YIN Peng LIN Hua-Liang National Center for Chronic and Noncommunicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijing100050China Department of Epidemiology School of Public HealthSun Yat-sen UniversityGuangzhou510080China Department of Epidemiology School of Public HealthZhengzhou UniversityZhengzhou450000China

The distribution of temperature and temperature-health association varied largely across different regions in China,a region-specific definition for heatwave was therefore *** collected the data on daily mortality,meteorological factors and air pollution in 84 Chinese cities during 2013–2016,which was divided into seven *** on the association between daily maximum temperature and mortality in each city in a threshold distributed lag non-linear model,where the threshold was defined as the temperature corresponding to the lowest mortality risk,we calculated the number of deaths that could be avoided for 1℃ decrease in maximum temperature under different thresholds,then a random-effect meta-analysis was used to generate regional results,in which the temperature with the highest avoidable mortality number for 1℃ decrease was considered as the most appropriate heatwave *** observed an immediate detrimental effect of high temperature within three lag *** analysis suggested to use 29.5℃,31.5℃,29.0℃,31.5℃,30.0℃,and 28.5℃ as the heatwave standard for east,north,northeast,central,south,and southwest region,with the avoidable mortality number of 1.54(95%Confidence interval(CI):0.88,2.19),0.55(95%CI:0.16,0.94),0.59(95%CI:0.32,0.86),1.14(95%CI:0.68,1.59),1.22(95%CI:0.54,1.90),and 0.78(95%CI:0.01,1.55),respectively,while the estimated number 0.19(95%CI:−0.02,0.40)in northwest region was not statistically *** concept of‘avoidable mortality for 1℃ decrease’was proposed to define the heatwave event,and varied maximum temperature between 28.5 and 31.5℃ was suggested for region-specific heatwave definition in China.

关键词： Heatwave Mortality burden Distributed lag non-linear model

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极端降水事件对广元市0～14岁儿童手足口病的影响

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环境与健康杂志 2017年第12期34卷 1062-1065页

作者：艾思奇姜宝法山东大学公共卫生学院流行病学系山东济南250012

目的定量分析广元市极端降水事件对0~14岁儿童手足口病发病的影响,为手足口病的防控工作提供科学指导。方法运用描述流行病学的方法对广元市手足口病及气象数据进行描述;应用Poisson回归模型分析2008—2011年间广元市极端降水事件与0~1... 详细信息

目的定量分析广元市极端降水事件对0~14岁儿童手足口病发病的影响,为手足口病的防控工作提供科学指导。方法运用描述流行病学的方法对广元市手足口病及气象数据进行描述;应用Poisson回归模型分析2008—2011年间广元市极端降水事件与0~14岁儿童发病的关系。结果研究期间0~14岁患者共有4 081例,发病主要集中在春末和夏初;Poisson回归结果显示,极端降水事件对0~14岁儿童、男童、女童、0~1岁儿童、2岁儿童、3~4岁儿童、5~14岁儿童手足口病影响的RR值及95%CI分别为1.556(1.398~1.731)、1.573(1.376~1.780)、1.711(1.436~2.038)、1.557(1.270~1.909)、1.745(1.418~2.148)、1.465(1.199~1.789)、1.682(1.302~2.173)。结论相关部门应在春末、夏初做好手足口病的防控工作;应加强对极端降水事件后儿童手足口病的防控,尤其是对女童、2岁儿童和5~14岁儿童。

关键词：极端降水事件手足口病 Poisson回归

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硼氢化钠储氢材料的制备与性能研究

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吉林化工学院学报 2015年第8期32卷 21-23页

作者：艾思奇齐春雷张思远中国石油吉林石化公司化工动力一厂吉林吉林132021

利用周期换向脉冲电流电解NaBO2制备配位储氢化合物NaBH4,利用碘量滴定法对电解产物进行定性定量测试,实现了在高碱性浓度范围内通过活性物质添加由偏硼酸钠电化学还原制备硼氢化钠的可能性,以电子作为还原剂代替传统合成方法中的金属钠... 详细信息

利用周期换向脉冲电流电解NaBO2制备配位储氢化合物NaBH4,利用碘量滴定法对电解产物进行定性定量测试,实现了在高碱性浓度范围内通过活性物质添加由偏硼酸钠电化学还原制备硼氢化钠的可能性,以电子作为还原剂代替传统合成方法中的金属钠,该合成工艺绿色环保且成本低廉;对电解获得的硼氢化钠进行水解放氢性能研究,金属配位储氢化合物水解放氢具有安全、装置简单和能量密度高等优点;实验中研究了硼氢化钠水解催化放氢系统,探讨不同体系催化剂、稳定剂等因素对系统放氢性能的影响.通过对制得的异相催化剂成分进行表征,并测得不同条件下催化水解反应速率数据,系统的研究了通过化学掺杂制备的Ni-B和Co-B催化剂的催化性能.

关键词： NaBH4 电解制备催化水解循环利用

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Multiplicity of Periodic Bouncing Solutions for Sublinear Damped Variation Systems via Nonsmooth Variational Methods

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Acta Mathematica sinica,English Series 2023年第7期39卷 1332-1350页

作者： si qi WANG Fei GUO School of Mathematics Tianjin UniversityTianjin 300354China Tianjin Key Laboratory of Brain-Inspired Intelligence Technology Tianjin 300354China

Two results about the multiplicity of nontrivial periodic bouncing solutions for sublinear damped vibration systems-x=g(t)x+f(t,x) are obtained via the Generalized Nonsmooth Saddle Point Theorem and a technique established by Wu Xian and Wang *** of them imply the condition "f≥0" required in some previous papers can be weakened,furthermore,one of them also implies the condition about ■F(t,x)/■t required in some previous papers,such as "|■F(t,x)/■t|=σ_(0)F(t,x)" and "|■F(t,x)/■t|≤C(1+F(t,x))", is unnecessary,where F(t,x):=∫_(0)~xf(t,x)ds,and σ_(0),C are positive constants.

关键词： Damped vibration systems generalized Nonsmooth Saddle Point Theorem sublinear conditions periodic bouncing solutions multiplicity

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A dual-switching spin-crossover framework with redox regulation and guest response

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Science China Chemistry 2023年第6期66卷 1744-1749页

作者： Long-Fei Wang si-Guo Wu Ze-Yu Ruan ai-qi Jian Wen Cui Zhao-Ping Ni Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-Sen UniversityGuangzhou 510275China CNRS Centre de Recherche Paul PascalPessac F-33600France

A dual-switching spin crossover metal-organic framework(SCO-MOF)[Fe(TPB){Pt^(Ⅱ)(CN)_(4)}]·3iPrOH·4H_(2)O(TPB=1,2,4,5-tetra(pyridin-4-yl)benzene)is developed via the combination of redox-active framework and tunable *** reversible structural transformation between[Pt^(Ⅱ)(CN)_(4)]^(2-) and[Pt^(Ⅳ)Br_(2)(CN)_(4)]^(2-)moieties can be manipulated by redox post-synthetic modification(PSM),which results in the change of SCO behaviors from step-wise to *** influences of the oxidative addition of bromides on the ligand field splitting of Fe side are further explored by density functional theory ***,the modulation of hysteretic four-/three-step,one-step and four-step SCO behaviors can be achieved by tuning the composition of guest ***,the combination of electronic bistability,redox reaction and guest recognition in a homogeneous lattice provides a utility platform for designing multi-responsive molecule-based materials.

关键词： spin crossover iron(Ⅱ) post-synthetic modification redox host-guest interaction

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Predictions of bulk velocity for open channel flow through submerged vegetation

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Journal of Hydrodynamics 2020年第4期32卷 795-799页

作者： Wei-jie Wang Xiao-yu Cui Fei Dong Wen-qi Peng Zhen Han ai-ping Huang Xue-kai Chen Yuan si State Key Laboratory of simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower ResearchBeijing 10003&China Department of Water Ecology and Environment China Institute of Water Resources and Hydropower ResearchBeijing 100038China

Vegetation is of great significance in river ecosystems in terms of hydrodynamics,water environment and *** question of how to predict the bulk velocity in channel flow through submerged vegetation is currently a hot topic in hydraulics *** present study addresses this *** various formulae used for bulk velocity estimation in previous work were reviewed and *** main novelty of this paper is that a new expression of friction factor is proposed as a function of two dimensionless factors,and the number of tuning parameters is less than that in previous work.A comparison of measured and calculated data was conducted for flow through submerged rigid and flexible *** comparison showed that the proposed new model can make more accurate predictions than previous *** is envisaged that the proposed formulation can be usefully employed in eco-hydraulics predictions.

关键词： Vegetation resistance drag coefficient bulk velocity open channel flow

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N-soliton solutions for the nonlocal two-wave interaction system via the Riemann–Hilbert method

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Chinese Physics B 2018年第12期27卷 157-163页

作者： si-qi Xu Xian-Guo Geng School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China College of Civil Engineering Xinyang Normal UniversityXinyang 464000China

In this paper, a nonlocal two-wave interaction system from the Manakov hierarchy is investigated via the Riemann–Hilbert approach. Based on the spectral analysis of the Lax pair, a Riemann–Hilbert problem for the nonlocal two-wave interaction system is constructed. By discussing the solutions of this Riemann–Hilbert problem in both the regular and nonregular cases, we explicitly present the N-soliton solution formula of the nonlocal two-wave interaction system. Moreover,the dynamical behaviour of the single-soliton solution is shown graphically.

关键词： nonlocal two-wave interaction system Riemann–Hilbert problem N-soliton solutions

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Optimal replacement of degrading components: a control-limit policy

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Science China(Information Sciences) 2021年第10期64卷 260-262页

作者： Xiaosheng si Tianmei LI qi ZHANG Department of Automation Rocket Force University of Engineering School of Mechanical Engineering Xi'an Jiaotong University

Dear editor,Components such as gyros, turbines, and bearings are vital in aircraft and spacecraft, and must run safely during their entire life cycle. However, gradual damage inevitably occurs resulting in component failure. Therefore, necessary maintenance such as component replacement should be scheduled. Traditional maintenance models are generally timebased, and in such models, maintenance decisions are made to minimize the expected cost rate,

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Studies on the Electronic Structures and Spectra of C_(78)(CH_2)_3

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Chinese Journal of Structural Chemistry 2007年第3期26卷 314-320页

作者： TENG qi-Wen WU Shi CHEN si-Cong Department of Chemistry Zhejiang University Hangzhou 310027. China Department of Biomedicine-engineering Zhejiang University Hangzhou 310027 China

The structures and spectra of 20 possible isomers of C78（CH2）3 have been studied by using AMI, INDO/CIS and DFT methods. The results show that the most stable isomer is 1,2,3,4,5,6-C78（CH2）3 （A） with annulene structures, where three -CH2 groups are added to the 6/6 bonds located at the same hexagon passed by the shortest axis of C78 （C2v）. Compared with that of C78 （C2v）, the first absorption in the electronic spectrum of C78（CH2）3 （A） iS blue-shifted because of its wider LUMO-HOMO energy gap. While the IR frequencies of the C-C bonds on the carbon cage are red-shifted owing to the formation of annulene structures and the extension of the conjugated system. The chemical shifts of the carbon atoms in 13C NMR spectra are moved upfield upon the addition.

关键词： C78(CH2)3 DFT electronic spectra IR spectra NMR spectra

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Crystallization Behavior and Dynamic Mechanical Properties of Poly(ε-caprolactone)/Octaisobutyl-Polyhedral Oligomeric silsesquioxanes Composites Prepared via Different Methods

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Chinese Journal of Polymer Science 2020年第2期38卷 158-163,I0006页

作者： si-qi Teng Zhi-Guo Jiang Zhao-Bin qiu State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Two octaisobutyl-polyhedral oligomeric silsesquioxanes(oib-POSS)reinforced biodegradable poly(ε-caprolactone)(PCL)composites were prepared via two different methods,i.e.,melt compounding and solution casting,which were named as m PCL/oib-POSS and s PCL/oibPOSS,respectively,in this ***-POSS dispersed finely in both composites;moreover,oib-POSS aggregates were larger in m PCL/oib-POSS than in s PCL/*** the different preparation methods,oib-POSS obviously promoted the crystallization of PCL,especially in s PCL/oib-POSS,but did not modify the crystal structure of *** storage moduli of PCL were improved significantly in both ***/oib-POSS composites with enhanced crystallization behavior and improved dynamic mechanical properties were successfully prepared through both methods;moreover,the solution casting method was more effective than the melt compounding method.

关键词： Poly(ε-caprolactone) POSS Crystallization

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