检索结果-南通市图书馆

Resonance-Enhanced Photon Excitation Spectroscopy of the Even-Parity Autoionizing Rydberg States of Xe

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2008年第5期21卷 401-406页

作者： Chun-yan Li Ting-ting Wang jun-feng Zhen Qun Zhang yang Chen Hefei National Laboratory for Physical Sciences at Microscale Department of Chemical Physics University of Science and Technology of China Hefei 230026 China

Xenon atoms were produced in their metastable states 5p^56s[3/2]2 and 5p^56s＇[1/2]0 in a pulsed DC discharge in a beam, and subsequently excited to the even-parity autoionizing Rydberg states 5p^5np＇ [3/2] 1,[1/2] 1, and 5p^5nf＇ [5/2] 3 using single photon excitation. The excitation spectra of the even-parity autoionizing resonance series from the metastable 129Xe were obtained by recording the autoionized Xe＋ with time-of-flight ion detection in the photon energy range of 28000-42000 cm-1. A wealth of autoionizing resonances were newly observed, from which more precise and systematic spectroscopic data of the level energies and quantum defects were derived.

关键词： Xe Pulsed DC discharge Resonance-enhanced photon excitation spectroscopy Autoionizing resonance

基于第三方B2B平台的供应链金融风险预警系统设计

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

自动化技术与应用 2024年第8期43卷 136-139页

作者：周静高志琨马彦刘硕国网数字科技控股有限公司国网雄安金融科技集团有限公司北京100053 国网汇通金财(北京)信息科技有限公司北京100075

由于现阶段预警系统未考虑供应链金融风险产生的原因,导致系统的虚警率和运行成本增加。为此提出一种基于第三方B2B平台的供应链金融风险预警系统。对系统初设的指标体系进行问卷信效度分析,组建研究对象的操作风险指标体系,分析风险发... 详细信息

由于现阶段预警系统未考虑供应链金融风险产生的原因,导致系统的虚警率和运行成本增加。为此提出一种基于第三方B2B平台的供应链金融风险预警系统。对系统初设的指标体系进行问卷信效度分析,组建研究对象的操作风险指标体系,分析风险发生的可能性以及后果,以达到第三方B2B平台下供应链金融风险预警的目的。仿真实验结果表明,供应链金融风险预警系统能够有效降低系统的虚警率,同时节省运行成本。

关键词：系统设计第三方B2B平台供应链金融风险预警系统运行成本

Self-suspended Pure Polydiacetylene Nanoparticles with Selective Response to Lysine and Arginine

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2016年第6期29卷 749-753,I0002页

作者： jun Luo Kai-yu Fu Hai-yan Dong Dao-yong Chen TheStateKeyLaboratoryofMolecularEngineeringofPolymersandDepartmentofmacromolecularScience FudanUniversityShanghai200433China

We demonstrate a very convenient access to self-suspended pure poly（10,12-pentacosadiynoic acid）（PDA） nanoparticles （NPs） simply by adding the ethanol solution of diacetylene monomer to water, followed by UV irradiation. The as-obtained PDA NPs are of high purity because no any initiator, catalyst or stabilizer was used during the whole process. The stabilizer-free PDA NPs are stable in the aqueous suspension. Due to the high purity and stability, the PDA NPs can respond sensitively and selectively to lysine and arginine among 18 kinds of water soluble natural amino acids; without the competitive interaction from the stabilizer, the sensitivity was enhanced.

关键词： Polydiacetylene Selective response Lysine Arginine

Novel strategy of nitrogen removal from domestic wastewater using pilot Orbal oxidation ditch

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2006年第5期18卷 833-839页

作者： GAO Shou-you PENG Yong-zhen WANG Shu-ying yan jun School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China. College of Environmental and Energy Engineering Beijing University of Technology Beijing 100022 China

A pilot-scale Orbed oxidation ditch was operated for 17 months to optimize nitrogen removal from domestic wastewater of average COD to total nitrogen ratio of 2.7, with particular concern about the roles of dissolved oxygen （DO）, mixed liquor suspended solids （MLSS） and return activated sludge （RAS） recycle ratio. Remarkable simultaneous nitrification and denitrification （SND） was observed and mean total nitrogen （TN） removal efficiency up to 72.1% was steadily achieved, at DO concentration in the out, middle and inner channel of 0.1, 0.4 and 0.7 mg/L, respectively, with an average M LSS of 5.5 g/L and RAS recycle ratio of 150%. Although the out channel took the major role in TN removal, the role of middle channel should never be ignored. The denitrification potential could be fully developed under low DO, high MLSS with adequate RAS ratio. The sludge settleability was amazingly improved under low DO operation mode, and some explanations were tried. In addition, a scries of simplified batch tests were done to determine whether novel microorganisms could make substantial contribution to the performance of nitrogen removal. The results indicated that the SND observed in this Orbal oxidation ditch was more likely a physical phenomenon.

关键词： nitrogen removal simultaneous nitrification and denitrification low DO MLSS novel bacterial

Seismic response of rocking isolated railway bridge piers with sacrificial components

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2020年第4期19卷 1005-1015页

作者： Xia Xiushen Wu Suiwen Shi jun Jia junfeng Chen Xingchong ma Huajun School of Civil Engineering Lanzhou Jiaotong UniversityLanzhou 730070China Department of Civil and Environmental Engineering MS258University of NevadaRenoNV 89557USA College of Architecture and Civil Engineering Beijing University of TechnologyBeijing 100124China

In this study, sacrificial components were incorporated into self-centering railway bridge piers to improve the lateral stiffness. The seismic response of this new detail was investigated. First, the method to compute the initial uplift moment of the self-centering pier is given. In addition, shaking table tests were conducted on a free-rocking pier without sacrificial components, which was used to validate a two-spring numerical model. Good agreement was obtained between the numerical results and experimental data. Furthermore, the validated model was employed to investigate the influence of sacrificial components on the seismic response of rocking piers. For this purpose, two models were developed, with and without sacrificial components. Nonlinear response history analysis was then performed on both models under three historical motions. The results showed that compared to the one without sacrificial components, the rocking pier with sacrificial components has comparable displacement at the top of the pier, and maximum uplift moment at high amplitude motion. Therefore, incorporating sacrificial components into the rocking pier can increase the lateral stiffness at service load and low amplitude frequent earthquakes but can produce comparable response at high seismic excitation. These results provide support for performance-based seismic design of self-centering rocking piers.

关键词： self-centering rocking pier shake table tests sacrificial components nonlinear response history analysis

Study on sulfur migration in activated carbon adsorption-desorption cycle: Effect of alkali/alkaline earth metals

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第1期33卷 119-129页

作者： jun Li Liqiang Zhang Tao Wang Jingcai Chang Zhanlong Song Chunyuan ma National Engineering Laboratory for Reducing Emissions from Coal Combustion Engineering Research Center of Eruironmental Thermal Technology of Ministry of EducationShandong Key Laboratory of Energy Carbon Reduction and Resource UtilizationSchool of Energy and Power EngineeringShandong UniversityJinan 250061China School of Environmental Science and Engineering Shandong UniversityQingdao 266237China

Activated carbon(AC)has been widely used in the removal of SO_(2) from flue gas owing to its well-developed pore structure and abundant functional ***,the effect of alkali/alkaline earth metals on sulfur migration was investigated based on the dynamic adsorption and temperature programmed desorption *** adsorption and desorption properties of six types of AC(three commercial and three laboratory-made)were carried out on a fixed-bed experimental device,and the physical and chemical properties of samples were determined by X-ray fluorescence,X-ray diffraction,scanning electron microscopy/energy dispersive X-ray,and X-ray photoelectron spectroscopy *** experimental results showed that the adsorbed SO_(2) cannot be completely desorbed by increasing the regeneration temperature(350-850℃),while the SO_(2) fixed in the AC combines with the Ca-based minerals in the ash to form a stable *** different samples,higher ash content,higher CaO content in the ash and a more developed pore structure lead to a higher SO_(2) fixation ***,the multiple adsorption-desorption cycles experiment showed that the effect of SO_(2) fixation is mainly reflected in the first cycle,after which the adsorption and desorption amount are approximately the *** study elucidates the effect of alkali/alkaline earth metals on the adsorption-desorption cycle of AC,which provides a deeper understanding of sulfur migration in the AC flue gas desulfurization process.

关键词： Activated carbon Alkali/alkaline earth metals Sulfur migration Adsorption-desorption cycle So2 fixation

在线全文

学校读者我要写书评

暂无评论

茶园仿生往复式开沟松土机设计与试验

农业机械学报 2024年第3期55卷 29-39页

作者：秦宽郎旭涛沈周高吴正敏毕海军曹成茂孙燕葛俊方梁菲安徽农业大学工学院合肥230036 安徽省智能农机装备工程实验室合肥230036 安徽农业大学茶与食品科技学院合肥230036 茶树生物学与资源利用国家重点实验室合肥230036

丘陵山区茶园土壤板结、石砾较多,使用传统旋转或移动式开沟机会出现打石跳刀、刀具无法入土、开沟不深、作业阻力大的问题。为此,依据人工铲土具有自发性以最低功耗完成最优作业路径的特点,设计仿人工铲土动作的曲柄摇杆式开沟装置,并... 详细信息

丘陵山区茶园土壤板结、石砾较多,使用传统旋转或移动式开沟机会出现打石跳刀、刀具无法入土、开沟不深、作业阻力大的问题。为此,依据人工铲土具有自发性以最低功耗完成最优作业路径的特点,设计仿人工铲土动作的曲柄摇杆式开沟装置,并研制小型茶园往复式开沟松土机。通过分析人工使用铁锹铲土的动作,建立入土、切土、抛土的运动模型,基于matlab软件分析得到人工铲土时铁锹锹尖运动轨迹的拟合方程,以此方程为基准,建立曲柄连杆机构的目标函数,结合约束条件解出曲柄摇杆机构结构参数,同时对开沟铲进行开沟阻力分析,确定开沟铲的结构参数。建立Recurdyn和EDEM耦合的开沟铲-土壤互作仿真模型,并进行三因素三水平正交试验,对作业和结构参数进行优化,得到最优参数组合:机器前进速度v为0.06 m/s、曲柄转速n为42 r/min、入土倾角φ为80°。田间试验结果表明,茶园往复式开沟松土机作业平均开沟深度为211.5 mm,开沟功率为0.119 kW,沟深稳定性系数为90.9%,相较于传统旋转式开沟机,开沟功率降低6.3%,沟深稳定性系数提高3.1个百分点,整机作业质量满足茶园农艺要求。

关键词：茶园开沟松土机仿生曲柄连杆机构 Recurdyn EDEM

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

癌症患者家庭沟通量表的汉化及信效度检验

护士进修杂志 2024年第4期39卷 378-384页

作者：马瑞瑞马红梅陈炜琳徐旭冉君武汉大学第一临床学院湖北武汉430000

目的汉化癌症患者家庭沟通量表(CCAT-PF),并检验其信效度。方法采用Brislin模型将英文版CCAT-PF进行翻译、回译、文化调适与预测试;使用汉化后的CCAT-PF于2022年1-8月分别在391例癌症患者及391名家庭照顾者中进行调查,检验其信效度。... 详细信息

目的汉化癌症患者家庭沟通量表(CCAT-PF),并检验其信效度。方法采用Brislin模型将英文版CCAT-PF进行翻译、回译、文化调适与预测试;使用汉化后的CCAT-PF于2022年1-8月分别在391例癌症患者及391名家庭照顾者中进行调查,检验其信效度。结果中文版CCAT-PF包括癌症患者(CCAT-P)及其家庭照顾者(CCAT-F)2个分量表,每个分量表各17个条目,各提取出4个公因子,CCAT-P和CCAT-F的Cronbach′s α系数分别为0.902、0.900,重测信度分别为0.956、0.927,累计方差贡献率分别为68.565%、67.750%,内容效度均为1。结论中文版CCAT-PF信效度良好,可用于评估我国癌症患者及其家庭照顾者家庭沟通水平。

关键词：家庭沟通癌症癌症患者家庭沟通量表家庭照顾者信度效度量表汉化

维普期刊数据库博看期刊

Distributed parametric modeling and simulation of light polarization states using magneto-optical sensing based on the Faraday effect

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2016年第12期59卷 1899-1910页

作者： LI yan Song LIU jun CAO Li Xin Liu Qi Zhi School of Electrical and Electronic Engineering North China Electric Power University

To solve the problems encountered in practical processes of magneto-optical sensing, the infinitesimal distributed-parameter model and finite-element accumulation of different dielectric properties of micromaterials were used to describe the evolution of light polarization states, instead of the previously commonly used method of lumped-parameter simulation, thus essentially explaining the mechanism of sensing, magneto-optical effects, and related factors, and achieving multiphysics coupling using the COMSOL finite-element analysis method. Considering the cases of the Faraday effect without and with line birefringence, the magneto-optical effect and output characteristics of an infinitesimal magneto-optical sensor were simulated and studied. The results verified the effectiveness of the infinitesimal sensor model. Because the magnetic field, stress, and temperature changes alter the dielectric properties of magneto-optical materials, the finite-element accumulation method lays a good foundation for research on theoretical analysis and performance of magneto-optical sensors affected by factors such as the magnetic field, temperature, and stress.

关键词： magneto-optical sensor Faraday effect linear birefringence infinitesimal distributed-parameter model multi-physics coupling COMSOL