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含铀微粒分析技术研究进展

核化学与放射化学 2024年第3期46卷 193-204,I0001页

作者：胡睿轩沈彦李力力赵永刚中国原子能科学研究院放射化学研究所北京102413

含铀微粒分析是核保障领域环境取样分析中的一项重要技术。在涉铀核活动尤其是铀浓缩过程中,会向环境中释放含铀气溶胶,其干燥后形成的含铀微粒与自然界形成的含铀微粒在同位素组成、元素组成、杂质组成等方面均存在明显差异。因此,可... 详细信息

含铀微粒分析是核保障领域环境取样分析中的一项重要技术。在涉铀核活动尤其是铀浓缩过程中,会向环境中释放含铀气溶胶,其干燥后形成的含铀微粒与自然界形成的含铀微粒在同位素组成、元素组成、杂质组成等方面均存在明显差异。因此,可以通过分析所采集样品中微米或亚微米级尺寸含铀微粒的特征信息,为相应核设施、核活动的监测提供判断依据。经过近30年发展,目前已形成了较为成熟的含铀微粒分析方法体系。本文简单介绍了包括样品采集、初步筛选、微粒回收、识别及定位和测量在内的微粒分析流程,对比了各个环节常用技术手段的优缺点。同时,分别讨论了含铀微粒同位素分析、形貌及元素化合物组成分析、年龄分析三个研究方向的研究进展。最后,根据研究现状,结合国际原子能机构(IAEA)核查发展和实施支持计划(Development and Implementation Support Programme for Nuclear Verification),展望了未来含铀微粒分析技术的研究发展方向。

关键词：核保障铀微粒分析

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提升高压氢气压缩机效能的技术改造

中国氯碱 2024年第1期 27-31页

作者：巩庆刚赵永刚山东铝业有限公司氯碱厂山东淄博

概述了高压氢压机的工作原理,通过对氢气处理工艺的改进,降低了氢气含水率和高压氢压机故障率,提高了高压氢压机效能,为企业带来了效益。

关键词：高压氢压机效能氢气冷却器氢气含水

Enhanced Magnetic and Ferroelectric Properties and Current-Voltage Hysteresis by Addition of La and Ti to BiFeO_(3) on 0.7%Nb−SrTiO_(3)

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Chinese Physics Letters 2011年第6期28卷 276-279页

作者： CHANG Hong zhao yong-gang School of Physical Science and Technology Inner Mongolia UniversityHohhot 010021 Department of Physics Tsinghua UniversityBeijing100084

By adding La and Ti,we improve the magnetic and ferroelectric properties of Bi_(0.8)La_(0.2)Fe_(0.92)Ti_(0.08)O_(3)and Bi0.8La0.2FeO_(3)films on 0.7%Nb−SrTiO_(3).In Bi_(0.8)La_(0.2)Fe_(0.92)Ti_(0.08)O_(3)and Bi0.8La0.2FeO_(3),the saturation magnetization and the coercivity are several times higher than those in BiFeO_(3).The La and Ti additions reduce the leakage current,and increase the remnant electric polarization.A resistance switching is observed in Bi_(0.8)La_(0.2)Fe_(0.92)Ti_(0.08)O_(3)/0.7%Nb−SrTiO_(3)and Bi0.8La0.2FeO_(3)/0.7%Nb−SrTiO_(3)***,it is observed that Bi_(0.8)La_(0.2)Fe_(0.92)Ti_(0.08)O_(3)/0.7%Nb−SrTiO_(3)has a wider current−voltage hysteresis and a larger resistance difference than Bi_(0.8)La_(0.2)FeO_(3)/0.7%Nb−SrTiO_(3).In the interface of Bi_(0.8)La_(0.2)Fe_(0.92)Ti_(0.08)O_(3)/0.7%Nb−SrTiO_(3),the ratio of high to low resistance is 103 and 105 times,at 300 K and 10 K,*** voltage pulses can switch the resistance to vary in the 2 *** transport mechanisms show that a trap−controlled space-charge-limited current induces current-voltage hysteresis and resistance *** current of Bi_(0.8)La_(0.2)Fe_(0.92)Ti_(0.08)O_(3)/0.7%Nb−SrTiO_(3)decays with the Curie–Von Schweidler law.

关键词： resistance hysteresis ferroelectric

情绪调节策略在童年期虐待经历与大学生抑郁间的中介作用

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中国健康教育 2024年第5期40卷 441-445页

作者：张蓉张思齐赵永刚尚玉秀宁夏医科大学公共卫生学院/宁夏环境因素与慢性病控制重点实验室宁夏银川750004 陕西省西安市未央区疾病预防控制中心陕西西安710000

目的探讨童年期虐待经历、情绪调节策略与大学生抑郁之间的关系,分析情绪调节策略在童年期虐待经历与抑郁间的中介作用。方法采用童年期创伤问卷、情绪调节量表及抑郁自评量表对1172名在校大学生进行问卷调查。结果童年期虐待各维度与... 详细信息

目的探讨童年期虐待经历、情绪调节策略与大学生抑郁之间的关系,分析情绪调节策略在童年期虐待经历与抑郁间的中介作用。方法采用童年期创伤问卷、情绪调节量表及抑郁自评量表对1172名在校大学生进行问卷调查。结果童年期虐待各维度与认知重评呈负相关(r=-0.171~-0.271,P<0.01)、与表达抑制呈正相关(r=0.084~0.089,P<0.01),与抑郁各维度间均呈正相关(r=0.160~0.455,P<0.01)。认知重评与抑郁各维度间存在负相关(r=-0.107~-0.270,P<0.01),而表达抑制与抑郁各维度间存在正相关(r=0.106~0.180,P<0.01)。认知重评及表达抑制在忽视和情感障碍间、忽视和心理障碍间均起到部分中介作用,中介效应分别占总效应的15.77%,15.42%。结论童年期虐待、情绪调节策略与大学生抑郁间关系密切,童年期虐待不仅直接影响大学生抑郁的发生,还通过认知重评和表达抑制影响大学生抑郁的发生。

关键词：童年期虐待情绪调节策略抑郁中介效应

基于Python人工智能模块的输变电工程造价预测研究

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电站系统工程 2024年第3期40卷 73-75页

作者：赵永刚刘万珍内蒙古电力勘测设计院有限责任公司

输变电工程造价预测是输变电工程建设中的一个重要问题。针对当前输变电工程造价预测中存在的问题,提出了一种基于Python人工智能模块的预测方法。首先,对输变电工程的历史数据进行了收集和分析,从中提取出了对造价预测有重要影响的相... 详细信息

输变电工程造价预测是输变电工程建设中的一个重要问题。针对当前输变电工程造价预测中存在的问题,提出了一种基于Python人工智能模块的预测方法。首先,对输变电工程的历史数据进行了收集和分析,从中提取出了对造价预测有重要影响的相关特征。其次,采用了Python人工智能模块对输变电工程造价预测进行建模和预测。最后,对模型进行训练和优化,测试和验证模型的预测能力和准确性。实验结果表明,Python人工智能模块在预测输变电工程造价的准确性和精度上都优于传统方法。

关键词：输变电工程 Python 人工智能造价预测

Size Effects for the Adsorption of Alkali Metal Atoms on the Si(001) Surface

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Chinese Journal of Structural Chemistry 2015年第6期34卷 837-852页

作者： NI Bi-Lian HU Jian-Ming zhao yong-gang LI Yi Department of Basic Chemistry College of PharmacyFujian Medical University College of Chemistry Fuzhou University Command Academy of Fuzhou the Chinese People's Armed Police Force

The adsorptions of a series of alkali metal （AM） atoms, Li, Na, K, Rb and Cs, on a Si（001）-2 × 2 surface at 0.25 monolayer coverage have been investigated systematically by means of density functional theory calculations. The effects of the size of AM atoms on the Si（001） surface are focused in the present work by examining the most stable adsorption site, diffusion path, band structure, charge transfer, and the change of work function for different adsorbates. Our results suggest that, when the interactions among AM atoms are neglectable, these AM atoms can be divided into three classes. For Li and Na atoms, they show unique site preferences, and correspond to the strongest and weakest AM-Si interactions, respectively. In particular, the band structure calculation indicates that the nature of Li-Si interaction differs significantly from others. For the adsorptions of other AM atoms with larger size （namely, K, Rb and Cs）, the similarities in the atomic and electronic structures are observed, implying that the atom size has little influence on the adsorption behavior for these large AM atoms on the Si（001） surface.

关键词： size effects adsorption alkali metal atoms Si(001) surface

Spectral Selectivity of CdTe Cells with Substrate Configuration for Photovoltaic/Thermal Applications

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Journal of Thermal Science 2024年第4期33卷 1542-1553页

作者： CHEN Ken HU Kongfu zhao Bin CHEN Tao HAO yong PEI gang Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei230027China Key Laboratory of Solar Thermal Conversion of Anhui Province Hefei230027China Hefei National Laboratory for Physical Sciences at Microscale Department of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei230026China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

Existing photovoltaic cells with high infrared emissivity generate huge radiative heat loss in photovoltaic/thermal applications and degrade the photothermal *** purpose of this work is to evaluate the full spectral absorptivity of CdTe cells to find a spectrally selective photovoltaic cell for photovoltaic/thermal *** this end,the solar absorptivity and mid-infrared thermal emissivity of CdTe cells were tested by ellipsometry,UV-Vis-NIR spectrophotometer,and Fourier transform infrared *** experimental results show that the AM 1.5 solar spectrum weighted absorptivity of the substrate configuration CdTe cell reaches 0.91,and the mid-infrared emissivity is only 0.29,while the superstrate configuration cell emissivity is as high as *** research shows that substrate configuration with a transparent conductive layer on top can be flexibly grown on metal foils and has spectral selectivity with high solar absorptivity and low mid-infrared emissivity should be considered in the future for photovoltaic/thermal applications.

关键词： photovoltaic/thermal spectral selectivity substrate configuration CdTe cell ITO

燃煤锅炉燃烧利用矿井乏风甲烷改造经济性及运行影响分析

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现代化工 2024年第10期44卷 208-213页

作者：郭前鑫魏琳王虎谢国威何超王志超刘超赵勇纲神华神东电力有限责任公司陕西西安710076 西安热工研究院有限公司陕西西安710054 国家能源集团国源电力有限公司北京100033

为处理矿井大流量乏风中的超低浓度甲烷,拟采用将乏风作为锅炉二次风进行处理利用。对此类工程改造的锅炉引风、投资运行成本、项目改造收益、锅炉效率影响进行了分析。结果表明,矿井乏风甲烷利用工程改造减小了原来锅炉烟气的产生量,... 详细信息

为处理矿井大流量乏风中的超低浓度甲烷,拟采用将乏风作为锅炉二次风进行处理利用。对此类工程改造的锅炉引风、投资运行成本、项目改造收益、锅炉效率影响进行了分析。结果表明,矿井乏风甲烷利用工程改造减小了原来锅炉烟气的产生量,且烟气量改变很小,无需对锅炉侧进行改造。管道及保温材料的采购与安装是此类改造工程的主要投资部分。该类项目的主要收益为乏风处理的碳汇补贴收益。乏风流速越低,工程投资成本变高,但运行成本变低,有助于项目的长周期盈利。绘制了不同输运长度下乏风总量与瓦斯绝对涌出量的20年期盈利平衡曲线。提出了优化矿井侧及二次风侧的乏风输送系统,并对乏风温度、湿度等因素对锅炉效率的影响进行了分析。对矿井乏风利用项目的立项及可行性分析提供了指导。

关键词：乏风甲烷二次风工程投资经济性锅炉效率

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Reversible and Reproducible Giant Universal Electroresistance Effect

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Chinese Physics Letters 2011年第10期28卷 217-219页

作者： SYED Rizwan ZHANG Sen YU Tian zhao yong-gang ZHANG Shu-Feng HAN Xiu-Feng Institute of Physics Chinese Academy of SciencesBeijing 100190 Department of Physics Tsinghua UniversityBeijing 100084 Department of Physics University of ArizonaTucsonArizona 85721USA

After the prediction of the giant electroresistance effect,much work has been carried out to find this effect in practical *** demonstrate a novel way to obtain a large electroresistance(ER)effect in the multilayer system at room *** current-in-plane(CIP)electric transport measurement is performed on the multilayer structure consisting of(011)-Pb(Mg_(1/3)Nb_(2/3))O_(3)−PbTiO_(3)(PMN−PT)/Ta/Al-O/*** is found that the resistance of the top metallic layer shows a hysteretic behavior as a function electric field,which corresponds well with the substrate polarization versus electric field(P–E)*** reversible hysteretic R–E behavior is independent of the applied magnetic field as well as the magnetic structure of the top metallic layer and keeps its memory *** novel memory effect is attributed to the polarization reversal induced electrostatic potential,which is felt throughout the multilayer stack and is enhanced by the dielectric Al-O layer producing unique hysteretic,reversible,and reproducible resistance switching *** novel universal electroresistance effect will open a new gateway to the development of future multiferroic memory devices operating at room temperature.

关键词： resistance multilayer effect