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沸石/聚乙烯醇涂覆改性聚丙烯隔膜及其性能研究

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材料科学与工艺 2024年第3期32卷 38-43,95页

作者：孙飞侯捷曾小平王大威王玮吴江渝等离子体化学与新材料湖北省重点实验室(武汉工程大学) 武汉430205 材料成形与模具技术国家重点实验室(华中科技大学) 武汉430074

为了改善商业聚丙烯(PP)隔膜与电解液浸润性差和热尺寸稳定性不佳的问题,采用浸涂法制备了沸石/聚乙烯醇涂覆PP隔膜。通过扫描电子显微镜(SEM)、电池测试系统和电化学工作站等表征手段研究了改性隔膜的表面形貌、孔隙率、吸液率、热稳... 详细信息

为了改善商业聚丙烯(PP)隔膜与电解液浸润性差和热尺寸稳定性不佳的问题,采用浸涂法制备了沸石/聚乙烯醇涂覆PP隔膜。通过扫描电子显微镜(SEM)、电池测试系统和电化学工作站等表征手段研究了改性隔膜的表面形貌、孔隙率、吸液率、热稳定性以及电化学性能,并与PP隔膜进行了性能对比。结果表明,改性后的PP隔膜孔隙率从38.4%提升到41.2%,吸液率从108.4%增加到181.1%,170℃下的热收缩率从58%降至23%。与PP隔膜相比,改性隔膜的循环性和稳定性得到了提高。界面阻抗从88Ω降为61Ω,离子电导率从0.58 mS/cm增加到0.75 mS/cm。沸石/聚乙烯醇涂层是改善PP隔膜电化学性能和热稳定性的有效方法,能够提高锂电池的循环性和安全性。

关键词：锂离子电池隔膜沸石聚乙烯醇涂覆

Cumene Liquid Oxidation to Cumene Hydroperoxide over CuO Nanoparticle with Molecular Oxygen under Mild Condition

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Journal of Natural Gas Chemistry 2007年第4期16卷 393-398页

作者： Meiying Zhang Lefu Wang Hongbing Ji Bing Wu xiaoping zeng Analytical and Testing Center South China University of Technology Guangzhou 510650 Guangdong China School of Chemical and Energy Engineering South China University of Technology Guangzhou 510650 Guangdong China

CuO nanoparticle was synthesized via wet chemical method and was characterized diffraction （XRD）, nitrogen adsorption-desorption, and scanning electron microscopy （SEM） by X-ray Catalytic oxidation of cumene with molecular oxygen was studied over CuO nanoparticle. The catalysts showed markedly higher activities as compared to CuO prepared by conventional method, CuO/Al2O3, or homogeneous copper catalyst under comparable reaction conditions. The cumene conversion, cumene hydroperoxide （CHP） yield, and selectivity using 0.25 g CuO nanoparticle catalyst and 0.1 mol cumene at 358 K for 7 h were 44.2%, 41.2% and 93.2%, respectively. The catalyst can be recycled. After 6 recycled experiments, no loss of catalytic activity was observed.

关键词： nanoparticle CuO cumene liquid oxidation

Finite Series Representation of Rician Shadowed Channel with Integral Fading Parameter and the Associated Exact Performance Analysis

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China Communications 2015年第3期12卷 62-70页

作者： JIAN Xin zeng xiaoping YU Anning YE Changrong YANG Junyi College of Communication Engineering Chongqing University

With the deployment of small cells and device to device communications in future heterogeneous networks,in many situations we would encounter mobile radio channels with partly blocked line of sight component,which are well modeled by the Rician shadowed(RS) fading *** this paper,by the usage of Kummer transformation,a simplified representation of the RS fading channel with integral fading parameter is *** is a finite series representation involving only exponential function and low order *** allows engineers not only the closed-form expressions for exact performance analysis over RS fading channel,but also the insights on the system design tactics.

关键词： rician shadowed fading channel Kummer transformation outage probability error probability channel capacity co-channel interference

Spectrum Allocation for Cognitive Radio Networks with Non-Deterministic Bandwidth of Spectrum Hole

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China Communications 2017年第3期14卷 87-96页

作者： Jie Huang xiaoping zeng Xiaoheng Tan Xin Jian Yuan He College of Communication Engineering Chongqing University Chongqing 400000 China

The spectrum allocation for cognitive radio networks(CRNs) has received considerable studies under the assumption that the bandwidth of spectrum holes is static. However, in practice, the bandwidth of spectrum holes is time-varied due to primary user/secondary user(PU/SU) activity and mobility, which result in non-determinacy. This paper studies the spectrum allocation for CRNs with non-deterministic bandwidth of spectrum holes. We present a novel probability density function(PDF) through order statistics as well as its simplified form to describe the statistical properties of spectrum holes, with which a statistical spectrum allocation model based on stochastic multiple knapsack problem(MKP) is formulated for spectrum allocation with non-deterministic bandwidth of spectrum holes. To reduce the computational complexity, we transform this stochastic programming problem into a constant MKP through exploiting the properties of cumulative distribution function(CDF), which can be solved via MTHG algorithm by using auxiliary variables. Simulation results illustrate that the proposed statistical spectrum allocation algorithm can achieve better performance compared with the existing algorithms when the bandwidth of spectrum holes is time-varied.

关键词： cognitive radio time-varied spectrum allocation non-deterministic bandwidth of spectrum holes stochastic programming

高压氧联合小针刀治疗膝关节骨关节炎的效果及对关节炎指标的影响

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中国医学创新 2024年第6期21卷 129-132页

作者：方玉平滕进忠曾小平南昌三三四医院康复科江西南昌330024

目的:探究高压氧联合小针刀治疗膝关节骨关节炎的效果及对关节炎指标的影响。方法:将2022年1月—2023年1月南昌三三四医院收治的120例膝关节骨关节炎患者根据随机数字表法分为A组(n=40)、B组(n=40)和C组(n=40)。A组进行小针刀治疗,B组... 详细信息

目的:探究高压氧联合小针刀治疗膝关节骨关节炎的效果及对关节炎指标的影响。方法:将2022年1月—2023年1月南昌三三四医院收治的120例膝关节骨关节炎患者根据随机数字表法分为A组(n=40)、B组(n=40)和C组(n=40)。A组进行小针刀治疗,B组进行高压氧治疗,C组进行高压氧联合小针刀治疗。比较三组治疗总有效率,治疗前后西安大略和麦克马斯特大学(WOMAC)骨关节炎指数、血清及关节液中C反应蛋白(CRP),以及红细胞沉降率(ESR)。结果:B组、C组的治疗总有效率均显著高于A组,差异均有统计学意义(P0.05);治疗后C组WOMAC骨关节炎指数、血清及关节液中CRP和ESR均显著低于A组、B组,B组则显著低于A组,差异均有统计学意义(P<0.05)。结论:高压氧联合小针刀治疗膝关节骨关节炎的效果较好,可下调血清、关节液中CRP和ESR水平,改善膝关节功能。

关键词：高压氧小针刀膝关节骨关节炎关节液

EmotionIC: emotional inertia and contagion-driven dependency modeling for emotion recognition in conversation

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Science China(Information Sciences) 2024年第8期67卷 130-146页

作者： Yingjian LIU Jiang LI xiaoping WANG Zhigang zeng School of Artificial Intelligence and Automation Huazhong University of Science and Technology Hubei Key Laboratory of Brain-inspired Intelligent Systems Huazhong University of Science and Technology Key Laboratory of Image Processing and Intelligent Control (Huazhong University of Science and Technology) Ministry of Education Institute of Artificial Intelligence Huazhong University of Science and Technology

Emotion recognition in conversation(ERC) has attracted growing attention in recent years as a result of the advancement and implementation of human-computer interface technologies. In this paper,we propose an emotional inertia and contagion-driven dependency modeling approach(EmotionIC) for ERC tasks. Our EmotionIC consists of three main components, i.e., identity masked multi-head attention(IMMHA), dialogue-based gated recurrent unit(DiaGRU), and skip-chain conditional random field(SkipCRF).Compared to previous ERC models, EmotionIC can model a conversation more thoroughly at both the feature-extraction and classification levels. The proposed model attempts to integrate the advantages of attention-and recurrence-based methods at the feature-extraction level. Specifically, IMMHA is applied to capture identity-based global contextual dependencies, while Dia GRU is utilized to extract speaker-and temporal-aware local contextual information. At the classification level, SkipCRF can explicitly mine complex emotional flows from higher-order neighboring utterances in the conversation. Experimental results show that our method can significantly outperform the state-of-the-art models on four benchmark *** ablation studies confirm that our modules can effectively model emotional inertia and contagion.

关键词： emotion recognition in conversation emotional inertia and contagion multi-head attention gated recurrent unit conditional random field

mc-Si:H/c-Si solar cell prepared by PECVD

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Rare Metals 2006年第Z1期25卷 176-179页

作者： XU Ying LIAO Xianbo DIAO Hongwei Li Xudong zeng Xiangbo LIU xiaoping WANG Minhua WANG Wenjing State Laboratory for Surface Physics Institute of Semiconductors and Center for Condensed Matter Physics Chinese Acad-bmy of Sciences Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China State Laboratory for Surface Physics Institute of Semiconductors and Center for Condensed Matter Physics Chinese Acad-bmy of Sciences Beijing 100083 China State Laboratory for Surface Physics Institute of Semiconductors and Center for Condensed Matter Physics Chinese Acad-bmy of Sciences Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China State Laboratory for Surface Physics Institute of Semiconductors and Center for Condensed Matter Physics Chinese Acad-bmy of Sciences Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China Beijing Solar Energy Research Institute Beijing 100083 China

Hetero-junction solar cells with an mc-Si:H window layer were achieved. The open voltage is increased while short current is decreased with increasing the mc-Si:H layer′s thickness of emitter layer. The highest of Voc of 597 mV has obtained. When fixed the thickness of 30 nm, changing the N type from amorphous silicon layer to micro-crystalline layer, the efficiency of the hetero-junction solar cells is increased. Although the hydrogen etching before deposition enables the c-Si substrates to become rough by AFM images, it enhances the formation of epitaxial-like micro-crystalline silicon and better parameters of solar cell can be obtained by implying this process. The best result of efficiency is 13.86% with the Voc of 549.8 mV, Jsc of 32.19 mA·cm-2 and the cell′s area of 1 cm2.

关键词： solar cell hetero-junction amorphous silicon plasma enhanced CVD

Combining sap flow measurement-based canopy stomatal conductance and ^(13)C discrimination to estimate forest carbon assimilation

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Chinese Science Bulletin 2005年第18期50卷 2021-2027页

作者： ZHAO Ping LU Ping MA Ling SUN Guchou RAO Xingquan CAI Xi'an zeng xiaoping South China Institute of Botany Chinese Academy of Sciences Guangzhou 510650 China CSIRO Plant Industry Darwin Laboratory PMB44 Winnellie. NT 0822. Australia

The available methods for studying C uptake of forest and their problems in practices are reviewed, and a new approach to combining sap flow and 13C techniques is proposed in this paper. This approach, obtained through strict mathematic derivation, combines sap flow measure-ment-based canopy stomatal conductance and 13C discrimi-nation to estimate instantaneous carbon assimilation rate of a forest. Namely the mean canopy stomatal conductance (gc) acquired from accurate measurement of sap flux density is integrated with the relationship between 13C discrimination (?) and Ci/Ca (intercellular/ambient CO2 concentrations) and with that between Anet (net photosynthetic rate) and gCO2 (stomatal conductance for CO2) so that a new relation be-tween forest C uptake and ? as well as gc is established. It is a new method of such kind for studying the C exchange be-tween forest and atmosphere based on experimental ecology.

关键词：碳同位素稳定性碳同化热量消散探测电导系数

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基于温压补偿新算法的渣处理过程流量控制

有色设备 2024年第3期38卷 90-94页

作者：刘娜张明生曾晓萍韩彤杏高晓明西北铅锌冶炼厂甘肃白银730900 中国恩菲工程技术有限公司北京100038

以温压补偿流量新算法在渣处理过程流量控制研究为例,通过艾默生DelaV系统功能块参数设置及过程控制数据对比分析,基于温压补偿新算法在熔池制造过程中将富氧流量控制在3540.73~3651.37 Nm^(3)/h,在本料加入及正常生产过程将富氧流量控... 详细信息

以温压补偿流量新算法在渣处理过程流量控制研究为例,通过艾默生DelaV系统功能块参数设置及过程控制数据对比分析,基于温压补偿新算法在熔池制造过程中将富氧流量控制在3540.73~3651.37 Nm^(3)/h,在本料加入及正常生产过程将富氧流量控制在5456.83~5577.27 Nm^(3)/h,均符合工艺指标要求值,彻底解决了传统电流信号处理算法中未考虑温压补偿引起的工艺富氧流量控制不准的难题,有效提高了渣处理工艺易燃易爆气体介质控制精度,实现熔化炉、烟化炉内精准配料和渣型控制,在企业设备精准计量与现场安全等多个方面具有广泛应用价值。

关键词：温压补偿新算法温压补偿密度修正因子模块化过程控制高效安全