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Kinetics of and solvent effects on photodegradation of hexachlorobenzene(HCB)and endosulfan(endosulfan I and endosulfan II)in solution

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Emerging Contaminants 2024年第3期10卷 400-408页

作者： Ye Wu Yan Lv Jun Jin yuhao fan Ru Li Junsong Bao Junjie Jiang Jiali Han Ying Wang College of Life and Environmental Sciences Minzu University of ChinaBeijing100081China Engineering Research Center of Food Environment and Public Health Beijing100081China State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing100875China

Organochlorine pesticides are chlorinated hydrocarbon *** production and use of organochlorine pesticides have been restricted around the world because they are persistent and toxic and able to undergo long-range transport and *** is necessary to develop efficient techniques for eliminating organochlorine pesticides from environmental media,and we also need to better understand how these techniques *** how organochlorine herbicides behave in various environmental settings is very *** looked on the photodegradation of endosulfan(endosulfan I and II)and hexachlorobenzene(HCB),two common organochlorine *** were conducted with pesticides at different concentrations,dissolved in various organic solvents,and exposed to light at different *** Functional Theory(DFT)was employed to study solvent *** kinetics followed first-order *** pesticides dissolved in various organic solvents showed a decrease in their degradation rates in the following order:toluene>acetone>*** was discovered that there was a good chance the Cl atoms on the benzene ring in HCB would be eliminated through nucleophilic *** was discovered that endosulfan breaks preferentially at the S=O double *** findings will aid in the development of strategies for successfully eliminating organochlorine pesticides from environmental media by aiding in the prediction and assessment of the photochemical behaviors of the pesticides under various environmental circumstances.

关键词： Organochlorine pesticides Degradation characteristics Density functional calculation Solvent effect

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BIOS辅助的无人机通信系统的联合优化

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陕西理工大学学报（自然科学版） 2024年第4期40卷 30-37页

作者：范雨豪唐菁敏宋耀莲昆明理工大学信息工程与自动化学院云南昆明650504

智能全表面作为可重构智能反射面的重要成员,因其能够同时服务于超表面两侧的用户设备而受到了越来越多的关注。为了解决城市场景中无人机与地面用户设备受到障碍物阻挡的问题,研究了一种基于双层智能全表面(BIOS)辅助的无人机通信系统... 详细信息

智能全表面作为可重构智能反射面的重要成员,因其能够同时服务于超表面两侧的用户设备而受到了越来越多的关注。为了解决城市场景中无人机与地面用户设备受到障碍物阻挡的问题,研究了一种基于双层智能全表面(BIOS)辅助的无人机通信系统的联合优化,目标是通过联合BIOS的两个相移设计和无人机飞行轨迹设计最大化所有用户的和速率。虽然由于其非凸性而难以求解最优解,但为了解决该问题,提出了有效的算法来获得高质量的次优解。仿真表明,BIOS相对于传统的智能反射面辅助无人机通信,用户设备的和速率显著提高。

关键词：无人机通信可重构智能反射面轨迹优化相移优化

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高压气动减压阀内部湿空气凝结特性

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液压与气动 2024年第10期48卷 75-84页

作者：任甲辉李嘉成樊昱豪雷伟佳高隆隆李宝仁华中科技大学机械科学与工程学院湖北武汉430074

针对高压气动减压阀内部结露结冰的现象,建立高压湿空气凝结流动数学模型,开展高压气动减压阀内部结露机理研究。以湿空气和液滴为流动介质,采用湿蒸汽凝结理论和多组分运输模型,通过C语言和Fluent-UDF编程开发了高压超音速湿空气凝结... 详细信息

针对高压气动减压阀内部结露结冰的现象,建立高压湿空气凝结流动数学模型,开展高压气动减压阀内部结露机理研究。以湿空气和液滴为流动介质,采用湿蒸汽凝结理论和多组分运输模型,通过C语言和Fluent-UDF编程开发了高压超音速湿空气凝结流动数值模型,搭建实验平台进行数值模型验证。利用该数值模型对高压气动减压阀内部湿空气凝结流动特性进行仿真,并分析了高压超音速流动过程中湿空气的流动凝结行为。结果表明:高压压缩气体流经节流阀口为绝热等熵过程,产生焦耳-汤姆逊正效应,气体体积迅速膨胀,压力和温度急剧下降,流速达到超音速流动;阀口附近下游区域大量成核,液滴快速增长,形成主要凝结区。高压湿空气凝结流动模型可为高压减压阀结构优化及进一步结冰机理研究提供参考。

关键词：高压气动减压阀湿空气结露相变凝结特性

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“时间银行”模式应用于我国农村养老事业的障碍与跨越——基于公益性与盈利性相结合的视角

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社会与公益 2024年第4期 20-23页

作者：张蕾李永安范宇豪顾晨妍宿迁学院经济管理学院

我国农村老年人口规模大,老龄化速度快。根据第七次全国人口普查数据,至2020年,我国农村60岁以上的老人占比23.81%,高于城镇的7.7个百分点。且我国农村养老服务供需矛盾突出,服务水平不高。受经济社会发展水平、家庭结构变化、青壮年人... 详细信息

我国农村老年人口规模大,老龄化速度快。根据第七次全国人口普查数据,至2020年,我国农村60岁以上的老人占比23.81%,高于城镇的7.7个百分点。且我国农村养老服务供需矛盾突出,服务水平不高。受经济社会发展水平、家庭结构变化、青壮年人口流出等因素影响,农村养老服务资源不足、分布不均,养老机构发展不充分、居家社区养老和优质普惠服务供给不足,农村养老水准较低。为此,政府提出互助养老政策,其中“时间银行”作为一种互助的模式,纳入人们讨论的视野中。

关键词：农村养老服务养老事业居家社区养老老龄化速度经济社会发展水平养老机构老年人口规模盈利性

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Effects of Diesel Concentration on the Thermal Conductivity,Specific Heat Capacity and Thermal Diffusivity of Diesel-Contaminated Soil

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Journal of Thermal Science 2024年第2期33卷 696-709页

作者： WU yuhao WU Yuefei LUO Gubai ZHANG Teng WANG Qing fan Liwu SONG Xin YU Zitao Key Laboratory of Clean Energy and Carbon Neutrality of Zhejiang Province Zhejiang UniversityHangzhou310027China State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou310027China Institute of Thermal Science and Power Systems School of Energy EngineeringZhejiang UniversityHangzhou310027China Center Environmental Protection Technology Company Limited Beijing100176China Institute of Soil Science Chinese Academy of SciencesNanjing210008China

High energy consumption is a serious issue associated with in situ thermal desorption(TD)remediation of sites contaminated by petroleum hydrocarbons(PHs).The knowledge on the thermophysical properties of contaminated soil can help predict accurately the transient temperature distribution in a remediation site,for the purpose of energy ***,such data are rarely reported for PH-contaminated *** this study,by taking diesel as a representative example for PHs,soil samples with constant dry bulk density but different diesel mass concentrations ranging from 0% to 20% were prepared,and the variations of their thermal conductivity,specific heat capacity and thermal diffusivity were measured and analyzed over a wide temperature range between 0℃ and 120℃.It was found that the effect of diesel concentration on the thermal conductivity of soil is negligible when it is below 1%.When diesel concentration is below 10%,the thermal conductivity of soil increases with raising the ***,when diesel concentration becomes above 10%,the change of the thermal conductivity of soil with temperature exhibits the opposite *** is mainly due to the competition between soil minerals and diesel,because the thermal conductivity of minerals increases with temperature,whereas the thermal conductivity of diesel decreases with *** analysis results showed that,compared with temperature,the diesel concentration has more significant effects on soil thermal *** of the diesel concentration,with the increase of temperature,the specific heat capacity of soil increases,while the thermal diffusivity of soil *** addition,the results of a control experiment exhibited that the relative differences of the thermal conductivity of the soil samples containing the same concentration of both diesel and a pure alkane are all below 10%,indicating that the results obtained with diesel in this study can be extended to the family of PHs.A theo

关键词： contaminated soil diesel concentration thermal conductivity specific heat capacity thermal diffusivity thermal desorption fractal model

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An Efficient and Fast Area Optimization Approach for Mixed Polarity Reed-Muller Logic Circuits

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Chinese Journal of Electronics 2024年第5期33卷 1165-1180页

作者： yuhao ZHOU Zhenxue HE Jianhui JIANG Xiaojun ZHAO fan ZHANG Limin XIAO Xiang WANG School of Software Engineering Tongji University Key Laboratory of Agricultural Big Data of Hebei Province Hebei Agricultural University School of Computer Science and Engineering Beihang University School of Electronic and Information Engineering Beihang University

Area has become one of the main bottlenecks restricting the development of integrated circuits. The area optimization approaches of existing XNOR/OR-based mixed polarity Reed-Muller(MPRM) circuits have poor optimization effect and efficiency. Given that the area optimization of MPRM logic circuits is a combinatorial optimization problem, we propose a whole annealing adaptive bacterial foraging algorithm(WAA-BFA), which includes individual evolution based on Markov chain and Metropolis acceptance criteria, and individual mutation based on adaptive probability. To address the issue of low conversion efficiency in existing polarity conversion approaches, we introduce a fast polarity conversion algorithm(FPCA). Moreover, we present an MPRM circuits area optimization approach that uses the FPCA and WAA-BFA to search for the best polarity corresponding to the minimum circuits area. Experimental results demonstrate that the proposed MPRM circuits area optimization approach is effective and can be used as a promising EDA tool.

关键词： Area optimization Combinatorial optimization problem Fast polarity conversion algorithm Fast polarity conversion algorithm Mixed polarity Reed-Muller Mixed polarity Reed-Muller Bacterial foraging algorithm Bacterial foraging algorithm Mixed polarity Reed-Muller Bacterial foraging algorithm BACTERIAL FORAGING ALGORITHM MINIMIZATION EXTRACTION NETWORK

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Estimation of total heat exchange factor based on adaptive kernel density estimation theory

Estimation of total heat exchange factor based on adaptive k...

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第32届中国控制与决策会议

作者： Xiaochuan Luo Mingwei Jiang Lu Yu yuhao fan Lei Zhang College of Information Science and Engineering Northeastern University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University

Total heat exchange factor plays an important role in determining the ideal temperature rise curve of the slab under steady-state *** "Black Box " experiment and the furnace temperature data measured by the thermocouples in the reheating furnace contain uncertainties and big noise that will affect the identification *** order to solve the above problems,this paper proposes weighted least squares method（WLS） based on adaptive kernel density *** the calculation process,WLS can adaptively reduce the influence of noise on the identification results,and avoid the "residual pollution" and "residual flooding" that may occur in the traditional fixed bandwidth kernel density estimation *** this paper,a numerical algorithm combining conjugate gradient method（CGM） and gradient projection method（GPM） is used to iteratively solve the WLS model,which ensures the stability of the iterative process and improves the identification ***,the CuPCrNi experimental slab data was used to verify the effectiveness of the adaptive kernel density estimation method and ensure robustness.

关键词： reheating furnace total heat exchange factor adaptive kernel density theory weighted least squares CGM GPM

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Ultralow Ohmic Contact in Recess-Free Ultrathin Barrier AlGaN/GaN Heterostructures Across a Wide Temperature Range

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Chinese Journal of Electronics 2024年

作者： yuhao WANG Sen HUANG Qimeng JIANG Xinhua WANG Jie fan Haibo YIN Ke WEI Yingkui ZHENG Xinyu LIU Key Laboratory of Microelectronic Devices & Integrated Technology Institute of Microelectronics of Chinese Academy of Sciences Institute of Microelectronics University of Chinese Academy of Sciences

‘Ohmic-before-passivation' process was implemented on ultrathin-barrier(UTB) AlGaN(<6 nm)/GaN heterostructure to further reduce the ohmic contact resistance(Rc). In this process, alloyed Ti/Al/Ni/Au ohmic metal was formed first, followed by AlN/SiNx passivation contributed to restore two-dimensional electron gas(2DEG) in the access region. Due to the sharp change in the concentration of 2DEG at the metal edge, a reduced transfer length(LT) consisted with lower Rc are achieved compared to that of ohmic contact on AlGaN(～20 nm)/GaN heterostructure with pre-ohmic recess process. Temperature-dependent current voltage measurements demonstrate that the carrier transport mechanism is dominated by thermionic field emission above 200 K and by field emission below 200 *** ‘ohmic-before-passivation' process enables the relative stability of ohmic contacts between 50 K to 475 K and significantly improves the DC characteristics of GaN-MIS-HEMTs, offering a promising means for scaling down and enabling the utilization of low-voltage GaN-based power devices in extreme environmental conditions.

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基于现代风险导向的审计质量控制研究

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市场周刊 2023年第4期36卷 154-157页

作者：范宇皓南京审计大学江苏南京211815

当前,随着经济的快速发展,单位经济活动的复杂性和审计风险的增加给会计师事务所带来了严峻的挑战。客观经济环境的变化使审计师比以往任何时候都更加关注审计质量控制的改进。我国会计师事务所尚处于起步阶段,机制运行中存在诸多问题,... 详细信息

当前,随着经济的快速发展,单位经济活动的复杂性和审计风险的增加给会计师事务所带来了严峻的挑战。客观经济环境的变化使审计师比以往任何时候都更加关注审计质量控制的改进。我国会计师事务所尚处于起步阶段,机制运行中存在诸多问题,会计师事务所结合当前运行阶段,提高了审计风险控制的有效性,增强了市场竞争力。文章以风险控制方法为基础,介绍了风险审计的重要性、风险管理方法的应用和审计质量控制。此外,还从风险因素的角度提出了优化审计质量控制的措施。

关键词：现代风险导向审计质量质量控制

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Recent advances in photothermal effects for hydrogen evolution

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Chinese Chemical Letters 2024年第1期35卷 129-139页

作者： Pengcheng fan yuhao He Junan Pan Ning Sun Qiyu Zhang Chen Gu Kang Chen Weinan Yin Longlu Wang College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology) Nanjing University of Posts&Telecommunications(NUPT)Nanjing 210023China

Photothermal effect has been widely employed in the H2 evolution process at the advantage of using clean energy sources to produce another one of higher *** solar-to-heat conversion have various forms and heat can facilitate reactions in a variety of ***,summarizing the sources and destinations of heat is important for constructing hydrogen production systems of higher *** view mainly focuses on the recent state-of-art progress of hydrogen evolution reaction(HER)based on photothermal ***,we introduce the main pathways of photothermal conversions applied in H2 ***,the functions of the photothermal effect are clearly ***,we go beyond the catalytic reaction and introduce a method to improve the catalytic system by changing the catalytic bulk phase through thermal *** the end,we sort out the challenges and outlook to offer some noble insights for this promising area.

关键词： Photothermal effect H_(2)evolution reaction Photothermal catalysis Water vapor splitting Environmental restoration

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