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Oxygen defects boost polysulfides immobilization and catalytic conversion:First-principles computational characterization and experimental design

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Nano Research 2020年第8期13卷 2299-2307页

作者： Qiu He bin yu Huan Wang Masud Rana Xiaobin Liao Yan zhao State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Materials Engineering School of Mechanical and Mining EngineeringThe University of QueenslandSt LuciaQLD4072Australia The Institute of Technological Sciences Wuhan UniversityWuhan430072China

Although some experiments have shown that point defects in a cathode host material may enhance its performance for lithium-sulfur battery(LSB),the enhancement mechanism needs to be well investigated for the design of desired sulfur ***,the first principle density functional theory(DFT)is adopted to investigate a high-performance sulfur host material based on oxygen-defective TiO2(D-TiO2).The adsorption energy comparisons and Gibbs free energy analyses verify that D-TiO2 has relatively better performances than defect-free TiO2 in terms of anchoring effect and catalytic conversion of ***,D-TiO2 is capable of absorbing the most soluble and diffusive long-chain *** newly designed D-TiO2 composited with three-dimensional graphene aerogel(D-TiO2@Gr)has been shown to be an excellent sulfur host,maintaining a specific discharge capacity of 1,049.3 mAhg^−1 after 100 cycles at 1C with a sulfur loading of 3.2 mgcm^−*** with the sulfur mass loading increasing to 13.7 mgcm^−2,an impressive stable cycling is obtained with an initial areal capacity of 14.6 mAhcm^−2,confirming the effective enhancement of electrochemical performance by the oxygen *** DFT calculations shed lights on the enhancement mechanism of the oxygen defects and provide some guidance for designing advanced sulfur host materials.

关键词： oxygen defects catalytic conversion lithium-sulfur battery density functional theory

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Integrated agronomic practices management improved grain formation and regulated endogenous hormone balance in summer maize (Zea mays L.)

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Journal of Integrative Agriculture 2020年第7期19卷 1768-1776页

作者： yu Ning-ning ZHANG Ji-wang LIU Peng zhao bin REN Bai-zhao State Key Laboratory of Crop Biology Ministry of Science and Technology/College of AgronomyShandong Agricultural UniversityTai’an 271018P.R.China

Compared with single agronomic practices management during grain formation, knowledge about integrated agronomic practices management on grain-filling characteristics and physiological function of endogenous hormones was limited. In order to clarify this issue, two field experiments, integrated agronomic practices management(IAPM), T1(local conventional cultivation practices), T2(an optimized combination of cropping systems and fertilizer treatment), T3(treatment based on high-yield studies), and T4(further optimized combination of cropping systems and fertilizer treatment), and nitrogen rate testing(NAT)(four nitrogen rates, 0, 129.0, 184.5, and 300.0 kg N ha–1) were performed with summer maize hybrid Zhengdan 958(ZD958). Results showed that with increased nitrogen rate, the endogenous hormone balance was promoted and the grain-filling characteristics were improved sufficiently to resulting in a significant increase in grain yield. However, the grain-filling characteristics deteriorated and yield was reduced with excessive nitrogen fertilization. However, IAPM could promote hormone balance and improve grain filling characteristic. The indole-3-acetic acid(IAA), zeatin riboside(ZR), and gibberellin(GA3) contents under T2 and T4 treatments were higher and the abscisic acid(ABA) content was lower, and the ZR and GA3 contents under T3 were higher than those under T1. Those resulted in the maximum grain-filling rate(Wmax) and the active grain-filling period(P) under T2, T3 and T4 were significantly increased than those under T1, and hence promoted kernel weight and grain yield. So IAPM promoted hormone balance by improving tillage model, optimizing fertilizer rate and fertilization period, appropriately increasing planting density and delaying harvest, which promoted grain filling rate and lengthened active grain-filling period, finally increased grain yield.

关键词： grain fling endogenous hormone integrated agronomic practices management summer maize

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Identification of synoptic patterns for extreme rainfall events associated with landfalling typhoons in China during 1960–2020

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Advances in Climate Change Research 2022年第5期13卷 651-665页

作者： Da-Jun zhao Hong-Xiong XU yu-bin yu Lian-Shou CHEN State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China

Extreme rainfall associated with landfalling typhoon(ERLTC)can cause severe disasters and economic impacts throughout *** the accuracy of ERLTC forecasts is therefore crucial in disaster prevention and *** top 26 ERLTC events in China during 1960–2020 are investigated based on multi-source *** ERLTC events are categorized into five main types according to the geographical location of the extreme precipitation and its position relative to the tropical cyclone(TC)center,namely:the typhoon inner-core rainfall in Taiwan(TWIC),typhoon inverted trough rainfall in Taiwan(TWIT),weak typhoon rainfall in Hainan(HNWK),strong typhoon rainfall in Zhejiang(ZJST)and inland typhoon remnant rainfall(ILRM).All the ERLTC events occurred in the weakening stage of TC after reaching its lifetime maximum intensity in convective cloud(TBB≤−32℃)regions over complex local *** translational speeds of 20 TCs(76.9%of the total)were smaller than the climatological average(20.6 km h^(−1))during the extreme precipitation *** differences are as follows:the TWIC and TWIT types are featured with different season,track and water vapor channel although both occurred in *** other three types are distinguished by spinning track and strong convective cloud for HNWK type,strong TC intensity and binary TC interactions for ZJST type;and stagnation and strong westerly trough activity for ILRM type,*** results are expected to provide useful clues for an in-depth understanding of ERLTC events over China.

关键词： Landfalling typhoons Extreme precipitation Synoptic patterns Typhoon remnant

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Polyether-polyester and HMDI Based Polyurethanes:Effect of PLLA Content on Structure and Property

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Chinese Journal of Polymer Science 2019年第11期37卷 1152-1161页

作者： Lei Shi Ruo-yu Zhang Wu-bin Ying Han Hu yu-bin Wang Ya-Qian Guo Wen-Qin Wang zhao-bin Tang Jin Zhu Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 China School of Material Science and Chemical Engineering Ningbo University Ningbo 315211 China

Thermoplastic poly(ether-ester-urethane)s were synthesized from poly(L-lactide) diols (PLLA diols), polytetrahydrofuran diol (PTMG diols), 4,4'-dicyclohexylmethane diisocyanate (HMDI), and 1,4-butanediol (BDO) by a two-step reaction, and the morphology and property of the resultant TPU could be adjusted by varying the PLLA contents. The soft segment was composed of PLLA and PTMG diols. By controlling the percentage of PLLA in the soft segment, the glass transition temperature and mechanical properties of the polyurethanes could be regulated. Based on the FTIR spectrum, we found that two kinds of hydrogen bonding existed individually in soft matrix and hard domain. The hydrogen bonding in soft matrix was unstable, which could be destroyed during elongation. With in situ stretching WAXS and SAXS experiments, we found that the PLLA crystal was destroyed and the PLLA domain oriented along the stretch direction. Finally, we proposed a schematic model to illustrate the microstructures of these elastomers before and after stretch.

关键词： Poly(L-lactide) diol Polyurethane Mechanical property Hydrogen bonding

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Influences of GVD on the characteristics of soliton in a passively mode-locked Er-doped fiber laser

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The Journal of China Universities of Posts and Telecommunications 2013年第6期20卷 117-121页

作者： BAI bing zhao Xiao-hui GUO yu-bin HUO Jia-yu College of Communication Engineering Jilin University

In this paper, the characteristics of soliton in a passively mode-locked Er-doped fiber laser modeled by a non-distributed model are numerically investigated with the split-step Fourier method. Based on the analysis and model, sech2-shaped soliton is obtained by controlling the group velocity dispersion （GVD） and small-signal gain of the gain fiber. The law that the dispersion influences the characteristics of soliton in the mode-locked fiber laser is researched in net-cavity averaged anomalous dispersion regime.

关键词： passively mode-locked Er-doped fiber laser optical soliton group velocity dispersion

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The Dynamics Characteristics of Flexible Spacecraft and Its Closed-Loop Stability with Passive Control

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Journal of Systems Science & Complexity 2021年第3期34卷 860-872页

作者： MENG bin zhao yunbo Beijing Institute of Control Engineering Beijing 100094China Science and Technology on Space Intelligent Control Laboratory Beijing 100094China Zhejiang University of Technology Hangzhou 310014China

Passive control is the most popular methodology for flexible spacecraft while it remains an open problem whether the closed-loop performance can be achieved only with passive control subject to the coupling modes of rigid and ***,the closed-loop performance of passive PD control based on the dynamics of the Euler angle parameterization of spacecraft,which has been widely used in practice,is yet to be *** these challenges,by introducing the input-output exact linearization theory and Lyapunov theory,the authors show that the closed-loop performance for flexible spacecraft with rigid and flexible modes can be achieved by adjusting the parameters of the passive controllers sufficiently *** is done by firstly transforming the flexible spacecraft dynamics into an exact feedback linearization standard form,and then analyzing the closed-loop performance of flexible spacecraft.

关键词： Closed-loop stability flexible spacecraft internal dynamics input-output exact linearization passive control

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Association between the infection probability of COVID-19 and ventilation rates:An update for SARS-CoV-2 variants

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Building Simulation 2023年第1期16卷 3-12页

作者： Hui Dai bin zhao Departmentof Building Science School of ArchitectureTsinghua UniversityBeijing 100084China Beijing Key Laboratory of Indoor Air Quality Evaluation and Control Tsinghua UniversityBeijing 100084China

Severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),the cause of the current coronavirus disease 2019(COVID-19)pandemic,is ***,the risk of airborne transmission in confined spaces may be higher,and corresponding precautions should be ***,we obtained the quantum generation rate(q)value of three SARS-CoV-2 variants(Alpha,Delta,and Omicron)for the Wells-Riley equation with a reproductive number-based fitted approach and estimated the association between the infection probability and ventilation *** q value was 89–165 h^(−1)for Alpha variant,312–935 h^(−1)for Delta variant,and 725–2,345 h^(−1)for Omicron *** ventilation rates increased to ensure an infection probability of less than 1%,and were 8,000–14,000 m^(3)h^(−1),26,000–80,000 m^(3)h^(−1),and 64,000–250,000 m^(3)h^(−1)per infector for the Alpha,Delta,and Omicron variants,*** the infector and susceptible person wore N95 masks,the required ventilation rates decreased to about 1/100 of the values required without masks,which can be achieved in most typical *** air purifier was ineffective for reducing transmission when used in scenarios without *** prolonged exposure time in confined spaces remains critical in reducing the risk of airborne transmission for highly contagious SARS-CoV-2 variants.

关键词： COVID-19 SARS-CoV-2variants mask ventilation air purifier

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A real-time personal PM_(2.5)exposure monitoring system and its application for college students

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Building Simulation 2024年第9期17卷 1531-1539页

作者： Wanning Yang bin zhao Department of Building Science School of ArchitectureTsinghua UniversityBeijing100084China Beijing Key Laboratory of Indoor Air Quality Evaluation and Control Tsinghua UniversityBeijing100084China

There is a growing need in public health to conduct large-scale epidemiological studies to investigate the health effects of fine particulate matter(PM_(2.5))exposure *** response to this need,we developed a real-time personal PM_(2.5)exposure monitoring system(PEPS:Personal Exposure PM_(2.5)System),which is capable of monitoring personal exposure concentration and uploading data in real *** air quality self-labelling device,specifically customized for the PEPS,can be worn on the body and features functions for real-time data automatic upload,data storage,data export,and *** system enables researchers to obtain the big data of personal PM_(2.5)exposure concentration at low cost,with minimal manpower and technical *** has been utilized to investigate the personal exposure levels of PM_(2.5)among college students in Beijing,China,providing a substantial volume of valuable data for indoor air quality and related epidemiological *** maximum difference between the monitored daily average exposure concentration and the outdoor concentration was 265µg/m^(3),corresponding to a relative error of 1579.5%.The correlation analysis of 11 factors showed that the correlation between exposure concentration and outdoor concentration was as high as 0.66(p<0.001),and the correlation between exposure concentration and other certain factors was in the range of[−0.11,−0.03].

关键词： personal exposure monitoring system real-time indoor air quality fine particulate matter

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一次地下水污染事件的调查

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四川环境 2004年第6期23卷 23-26页

作者：余恒罗彬赵萍萍刘中光四川省环境监测中心站四川成都610041

对污染源及受污染地下水的调查首先从污染物的产生特性及嗅味入手,在对被污染地下水周边企业调查的基础上,运用GC/MS联用仪对受污染的地下水进行分析,鉴定出污染物为四氢噻吩,利用气相色谱半定量分析出污染源及地下水中污染物的浓度,最... 详细信息

对污染源及受污染地下水的调查首先从污染物的产生特性及嗅味入手,在对被污染地下水周边企业调查的基础上,运用GC/MS联用仪对受污染的地下水进行分析,鉴定出污染物为四氢噻吩,利用气相色谱半定量分析出污染源及地下水中污染物的浓度,最后确定出地下水受污染的原因以及其污染范围。

关键词：地下水污染四氢噻吩 GC/MS

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Inverse limits of hereditarily almost expandable class

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Applied Mathematics(A Journal of Chinese Universities) 2009年第2期24卷 237-244页

作者： zhao bin Dept. of Math. Kashgar Teacher＇s College Kashgar 844007 China Dept. of Math. ＆ Informatics Faculty of Science Chiba Univ. Chiba 263 - 8522 Japan

In this paper, the hereditarily almost expandability of inverse limits is investigated, with two results obtained. Let X be the inverse limit space of an inverse system （Xα, π^αβ, ∧}. （1） Suppose X is hereditarily κ-metacompact, if each Xα is hereditarily pointwise collectionwise normal （almost θ-expandable, almost discrete θ-expandable）, then so is X; （2） Suppose X is hereditarily κ-σ-metacompact, if each Xα is hereditarily almost σ-expandable （almost discrete σ-expandable = σ-pointwise collectionwise normal）, then so is X.

关键词： inverse limit space κ-metacompactness κ-σ-metacompactness hereditarily pointwise collection- wise normal hereditarily almost θ-expandable hereditarily almost σ-expandable

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