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一种电荷灵敏前置放大器的设计与实现

火箭军工程大学学报

火箭军工程大学学报 2024年第3期38卷 74-80页

作者：王佳帅秦晋许鹏卜洪涛王道平火箭军工程大学西安中核仪器股份有限公司

针对传统金硅面垒α谱仪所使用的电荷灵敏前置放大器存在电路结构复杂、损坏后维修周期长的问题，基于低噪声场效应管和集成运算放大器，使用电路仿真软件，设计了针对金硅面垒半导体探测器的电荷灵敏前置放大器，简化了电路结构。对该... 详细信息

针对传统金硅面垒α谱仪所使用的电荷灵敏前置放大器存在电路结构复杂、损坏后维修周期长的问题，基于低噪声场效应管和集成运算放大器，使用电路仿真软件，设计了针对金硅面垒半导体探测器的电荷灵敏前置放大器，简化了电路结构。对该前置放大器参数进行了理论计算和实验测试。结果表明：自制的电荷灵敏前置放大器的电荷变换增益为5×1012V/C，能量变换增益为222 mV/MeV，上升时间为200 ns；将其应用于金硅面垒α谱仪之中，能够测量239Pu板状源的α能谱。

关键词：电荷灵敏前置放大器金硅面垒探测器电路仿真 α能谱

基于无人机的非接触式监测技术在高铁站房的应用

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价值工程 2024年第27期43卷 99-101页

作者：周翰东肖嵩金钦明王聪中建铁路投资建设集团有限公司北京102601

在钢结构的施工过程中,尺寸误差往往引起质量问题,因此施工质量检测对其至关重要。在巴中东站项目中,基于无人机的非接触式监测技术被引入,用于高铁站钢桁架结构的质量控制。本研究详细介绍了三维激光扫描技术的原理和应用流程,通过对... 详细信息

在钢结构的施工过程中,尺寸误差往往引起质量问题,因此施工质量检测对其至关重要。在巴中东站项目中,基于无人机的非接触式监测技术被引入,用于高铁站钢桁架结构的质量控制。本研究详细介绍了三维激光扫描技术的原理和应用流程,通过对钢结构进行三维激光扫描并建立点云模型。通过处理点云模型,找出了钢结构安装过程中的距离偏差,并进行深入分析,以检验钢结构施工的质量。三维激光扫描技术的应用大幅缩短了钢结构质量检测周期,提高了其信息化水平。

关键词：非接触式监测技术钢桁架质量检测

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Diversity of intergranular corrosion and stress corrosion cracking for 5083 Al alloy with different grain sizes

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Transactions of Nonferrous Metals Society of China 2022年第3期32卷 765-777页

作者： jin qin Zhi LI Ming-yang MA Dan-qing YI Bin WANG School of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of Nonferrous Metal Materials Science and Engineering Ministry of EducationCentral South UniversityChangsha 410083China The Second Research Institute of Civil Aviation Administration of China Chengdu 610064China

5083 Al alloy sheets with different grain sizes(8.7-79.2 μm) were obtained by cold rolling and annealing. Their microstructures, intergranular corrosion(IGC), stress corrosion cracking(SCC), and crack propagation behaviors were investigated. The results showed that samples with coarse grains exhibit better IGC resistance with a corrosion depth of 15 μm. The slow strain rate test results revealed that fine-grained samples exhibit better SCC resistance with a susceptibility index(ISSRT) of 11.2%. Furthermore, based on the crack propagation mechanism, grain refinement can improve the SCC resistance by increasing the number of grain boundaries to induce the corrosion crack propagation along a tortuous path. The grains with {011} orientation could hinder crack propagation by orientating it toward the low-angle grain boundary region. The crack in the fine-grained material slowly propagates due to the tortuous path, and low H;and Cl;concentrations.

关键词： grain size intergranular corrosion stress corrosion cracking crack propagation 5083 Al alloy

Redox behavior and chemical species of arsenic in acidic aqueous system

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Transactions of Nonferrous Metals Society of China 2017年第9期27卷 2063-2072页

作者： jin-qin YANG Li-yuan CHAI qing-zhu LI Yu-de SHU School of Metallurgy and Environment Central South University Changsha 410083 China National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution Central South University Changsha 410083 China

Arsenic(As)removal from smelting acidic wastewater is an urgent *** most common method is oxidation of trivalent As(III)to pentavalent As(V)subsequently precipitated by ferric(Fe(III))*** of redox behavior and chemical species are of great importance for understanding As *** this work,cyclic voltammetry(CV)and UV?Vis spectroscopy were used for laboratory observation;meanwhile HSC and MINTEQ software were employed for theoretical *** is found that As(III)oxidation,a multiple electron transfer reaction,is *** oxidation over-potential is very high(about0.9V)in sulfuric acid solutions(pH1.0).In addition,Fe(III)?As(V)complexes are evidenced by UV?Vis spectra and chemical species analyses in series of Fe(III)?As(V)?H2SO4?H2O ***,the Fe(III)and As(V)species distribution against pH values are determined and a newφ?pH diagram with inclusion of Fe?As complexes is consequently compiled based on thermodynamic data predicted by other researchers.

关键词： arsenic ferric-arsenic complexes φ-pH diagram chemical species acidic wastewater

SECOND-ORDER NONLINEAR OPTICAL HYPERBRANCHED POLYMER CONTAINING ISOLATION CHROMOPHORE MOIETIES DERIVED FROM BOTH “H”-TYPE AND STAR-TYPE CHROMOPHORES

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Chinese Journal of Polymer Science 2013年第10期31卷 1415-1423页

作者： Wen-bo Wu Ying-jie Fu Can Wang Zhen Xu Cheng Ye jin-gui qin Zhen Li Department of Chemistry Hubei Key Lab on Organic and Polymeric Opto-Electronic MaterialsWuhan University Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences

An NLO hyperbranched polymer （HP1） derived from both ＂H＂-type and star-type chromophores was synthesized successfully for the first time with high yield via one-pot ＂A2 ＋ B3＂ Suzuki polymerization reaction. Isolation chromophore was also introduced to further improve its performance. Although under the test conditions, the films of HP1 could not be poled completely, it still demonstrated satisfactory macroscopic NLO effect with the second harmonic generation （SHG） coefficient d33 value of 36 pm/V.

关键词： Hyperbranched polymer NLO Isolation chromophore "H"-type chromophore Star-type chromophore.

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熔盐储热耦合压缩空气储能系统经济性分析

热力发电 2024年第8期53卷 1-8页

作者：赵瀚辰韩伟姚明宇孙雨薇秦进张顺奇张可臻陆续西安热工研究院有限公司陕西西安710054

压缩空气储能作为一种大规模物理储能技术,广泛应用于可再生能源消纳和电网削峰填谷。设计了一种耦合熔盐储热的压缩空气储能系统,采用Ebsilon软件对复合系统进行建模仿真。基于该储能系统对外供应热水、蒸汽、电能的工况,研究不同系统... 详细信息

压缩空气储能作为一种大规模物理储能技术,广泛应用于可再生能源消纳和电网削峰填谷。设计了一种耦合熔盐储热的压缩空气储能系统,采用Ebsilon软件对复合系统进行建模仿真。基于该储能系统对外供应热水、蒸汽、电能的工况,研究不同系统运行模式下的?效率、热效率以及经济性。结果表明:复合系统在储气压力为7 MPa、排气温度系数为1.96时系统?效率最高,达到64.98%;在储气压力12 MPa时系统热效率最高,达到91.55%;在热汽电三联供应用场景下,最佳储能时长为6 h,储气压力为7、12 MPa时,最优发电时长分别为6、8 h;该研究可为耦合熔盐储热压缩空气储能热电联供提供理论指导。

关键词：熔盐储热压缩空气储能热电联供 (火用)效率热效率

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Effects of Yimu Shenghuasan Preparation on the Cytochrome P450 in Endometrial Cells and Immune Function of Dairy Cows

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Agricultural Sciences in China 2010年第10期9卷 1497-1503页

作者： DU jin-liang qin Jian-hua CHU jing-sheng XU Li-na MA Yu-zhong College of Animal Science and Technology Agricultural University of Hebei Baoding 071001 IER.China

In order to investigate the mode of action ofYimu Shenghuasan preparation in endometrial cells of dairy cows, the primary cultured endometrial cells in cows were isolated and the inflammatory models were made by lipopolysaccharide （LPS） induction. The inflammatory cells were treated with gradient concentration of herbal medicine preparation, Yimu Shenghuasan for 48 and 72 h. The expression of cytochrome P450 （CYP450） was detected by Western blot. The amounts of IgG and lgA in sera were also detected in the endometritis of dairy cows. The expression level of CYP450 in the endometrial cells of dairy cow was increased gradually, and the amounts of IgG, IgA were increased significantly as compared with those in the control group. The expression level of CYP450 in the inflammatory cells was increased significantly in the treatment of 2 000 μg mL^-1 of Yimu Shenghuasan after 48 h of treatment.

关键词： dairy cow endometrial cell CYP450 Yimu Shenghuasan preparation immune function

Synthesis and Structural Characterization of a Polyphosphazeneas Photoconductivc Material

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Chinese Chemical Letters 2000年第2期11卷 103-104页

作者： Zhen LI Cai Mao ZHAN jin Gui qin (Department of Chemistry,Wuhan University, Wuhan 430072) Department of Chemistry Wuhan University Wuhan 430072 China

The synthesis of a novel polyorganophosphazene that contains charge-transporting agent as side chains for photoconductive application is reported. Structural characterization for the high polymer was presented by 1H-N... 详细信息

关键词： Photoconductive polyphosphazene synthesis structure.

女贞子中多种有效化学成分的同步测定方法研究

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西南民族大学学报（自然科学版） 2024年第4期50卷 399-407页

作者：金雪琴漆与白杨越鹏李新莹西南民族大学化学与环境学院化学基础国家民委重点实验室四川成都610041

建立一种高效液相色谱法同步分析女贞子中咖啡酸、芦丁、槲皮素和熊果酸四种有效化学成分的方法.使用Waters SymmetryshieldTMRP18(4.6×250 mm,5μm)色谱柱,以乙腈-0.1%甲酸水溶液为流动相梯度洗脱,体积流量1.0 mL/min,检测波长范围190... 详细信息

建立一种高效液相色谱法同步分析女贞子中咖啡酸、芦丁、槲皮素和熊果酸四种有效化学成分的方法.使用Waters SymmetryshieldTMRP18(4.6×250 mm,5μm)色谱柱,以乙腈-0.1%甲酸水溶液为流动相梯度洗脱,体积流量1.0 mL/min,检测波长范围190~400 nm,柱温30℃,进样量10μL.在此色谱条件下,芦丁、槲皮素、咖啡酸和熊果酸四种成分分离效果良好,在40~250μg/mL、40~400μg/mL、80~700μg/mL和40~400μg/mL范围内各相关系数均大于0.999,不同浓度条件下芦丁、槲皮素、咖啡酸和熊果酸日内精密度试验的平均RSD值分别为0.41%、0.61%、0.61%、0.86%,日间精密度试验的平均RSD值分别为0.43%、0.52%、0.68%、0.83%,稳定性试验的RSD值分别在0.17%~0.67%、0.54%~0.80%、0.32%~0.87%、0.36%~1.29%,平均回收率分别为100.81%、97.68%、102.83%、100.01%.该方法精密度高、稳定性良好,可以对女贞子中芦丁、槲皮素、咖啡酸和熊果酸四种有效成分进行同步准确测定,研究结果可为四种有效化学成分的深入研究以及女贞子的开发应用提供研究基础.

关键词：咖啡酸芦丁槲皮素熊果酸高效液相色谱法

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