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Abundances of chemical elements in granitoids of different geological ages and their characteristics in China

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Geoscience Frontiers 2011年第2期2卷 261-275页

作者： Changyi Shi Mingcai yan qinghua Chi Institute of Geophysical and Geochemical Exploration Langfang Hebei 065000 China

Actual granitoid analytical data of 767 composited samples are presented here. The data source is 6080 samples collected mainly from 750 large- to middle-sized granitoid bodies across China. Data from the composited samples, which includes that of 70 elements, is analyzed according to geological age - Archeozoic （Ar）, Proterozoic （Pt）, Eopaleozoic （PZl）, Neopaleozoic （Pz2）, Mesozoic （Mz）, and Cenozoic （Cz） - and three major compositional varieties, e.g. alkali-feldspar granite, syenogranite and adamellite. Petrochemical parameters, trace-element content and rare-earth element （REE） distribu- tions of the different rock types and geological ages are characterized, and change tendencies through Archean to Cenozoic time are recorded. The comprehensive analytical data presented here has not been previously published. This significant data set can be used as fundamental information in studies of basic China geology, magma petrogenesis, ore exploration and geochemistry.

关键词： Granitoid plutons Element abundanceIgneous petrology Geological ages China

Degradation of tetracycline hydrochloride by ultrafine TiO_(2) nanoparticles modified g-C_(3)N_(4) heterojunction photocatalyst:Influencing factors,products and mechanism insight

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Chinese Chemical Letters 2022年第3期33卷 1337-1342页

作者： Bin Zhang Xu He Chengze Yu Guocheng Liu Dong Ma Chunyue Cui qinghua yan Yingjie Zhang Guangshan Zhang Jun Ma yanjun Xin Qingdao Engineering Research Center for Rural Environment Water Resources Protection and Utilization Center for Rural AreasQingdao Agricultural UniversityQingdao 266109China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150090China School of Marine Science and Technology Sino-Europe Membrane Technology Research Institute Harbin Institute of TechnologyWeihai 264209China

The unique heterojunction photocatalyst of graphite carbon nitride (g-C_(3)N_(4)) modified ultrafine TiO_(2) (g-C_(3)N_(4)/TiO_(2)) was successfully fabricated by electrochemical etching and co-annealing method. However, the effects of various environmental factors on the degradation of TC by g-C_(3)N_(4)/TiO_(2) and the internal reaction mechanism are still unclear. In this study, the effects of initial pH, anions, and cations on the photocatalytic degradation of tetracycline hydrochloride (TC) by g-C_(3)N_(4)/TiO_(2) were systematically explored, and the scavenging experiment and intermediate detection were conducted to better reveal the mechanism on photocatalytic degradation of TC. The results showed that the removal efficiency of photocatalytic degradation of TC by g-C_(3)N_(4)/TiO_(2) could reach 99.04% under Xenon lamp irradiation within 120 min. The unique g-C_(3)N_(4)/TiO_(2) heterojunction photocatalyst showed excellent photocatalytic performance for the degradation of TC at pH 3~7, and possesses outstanding anti-interference ability to NO_(3)^(-), Cl^(-), Na^(+), Ca^(2+) and Mg^(2+) ions in natural waters during the photocatalytic degradation TC process. Superoxide radicals (O_(2)^(·-)) and hydroxyl radicals (^(·)OH) were proved as the main reactive species for TC degradation, and the possible mechanism of the unique photocatalytic system for g-C_(3)N_(4)/TiO_(2) was also proposed. The above results can provide a reliable basis and theoretical guidance for the design and application of visible photocatalyst with high activity to degrade the actual wastewater containing TC.

关键词： Photocatalytic TiO_(2) G-C3N4 Tetracycline hydrochloride Mechanism

三油楔固定瓦滑动轴承空间安装方位对其性能影响的研究

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中国机械工程 2007年第11期18卷 1281-1284页

作者：阎庆华安琦上海新侨职业技术学院上海200237 华东理工大学上海200237

以三油楔固定瓦滑动轴承为研究对象,采用数值模拟方法,深入探讨了轴瓦空间安装位置(轴承安装角)对三油楔固定瓦滑动轴承静动特性和稳定性的影响,得出了三油楔固定瓦滑动轴承静动特性和稳定性随轴承安装角变化而变化的一系列规律性曲线,... 详细信息

以三油楔固定瓦滑动轴承为研究对象,采用数值模拟方法,深入探讨了轴瓦空间安装位置(轴承安装角)对三油楔固定瓦滑动轴承静动特性和稳定性的影响,得出了三油楔固定瓦滑动轴承静动特性和稳定性随轴承安装角变化而变化的一系列规律性曲线,并进行了理论分析。

关键词：三油楔固定瓦滑动轴承轴承安装角静动特性数值模拟

Geochemical evidence of paleogeography and paleoclimate during deposition of the 2nd Member of Kongdian Formation in Kongnan area

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Global Geology 2007年第1期10卷 48-54页

作者： qinghua yan Jing SUN Xudong ZHANG Qinglong MENG Man WANG College of Earth Sciences Jilin University Changchun 130061 China

The 2nd Member of Kongdian Formation has been made up of a large number of oil shale and mudstone in the Kongnan aera of Huanghua depression around the Bohai *** the Kongnan area,the lake basins were very large and deep during the deposition of the 2nd Member of Kongdian *** that period,the lakes were sealed,uncommunicated with the sea water and the paleoclimate was very warm and wet in Kongnan *** the content of the trace element and the rare earth element,carbon and oxygen isotope in the disquisition,The authors prove the two views correct.

关键词： Kongnan the 2nd Member of Kongdian Formation trace element rare earth element carbonand oxygen isotopes paleoclimate palaeogeography

烧结工艺及热挤压对纳米Al_(2)O_(3p)/7075铝基构型复合材料组织与性能的影响

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稀有金属材料与工程 2021年第10期50卷 3729-3738页

作者：颜庆华徐志凯卢德宏昆明理工大学材料科学与工程学院云南昆明650032

采用粉末冶金与热挤压工艺制备了Al_(2)O_(3)质量分数为10%的纳米Al_(2)O_(3p)/7075铝基构型复合材料。研究了真空与非真空下不同烧结温度、不同挤压比对复合材料微观组织、致密度、弹性模量、硬度和抗压强度的影响。结果表明:随烧结温... 详细信息

采用粉末冶金与热挤压工艺制备了Al_(2)O_(3)质量分数为10%的纳米Al_(2)O_(3p)/7075铝基构型复合材料。研究了真空与非真空下不同烧结温度、不同挤压比对复合材料微观组织、致密度、弹性模量、硬度和抗压强度的影响。结果表明:随烧结温度升高,挤压比4:1与8:1构型复合材料的硬度皆为先增加后减小,整体硬度相对基体材料均明显提高。复合材料经过挤压后的致密度均在98%以上。挤压比4:1,烧结温度为620、630、640℃时,相对于基体材料抗压强度分别提高15.3%,17.2%,14.0%,随温度升高先增大后减小。挤压比8:1时,相对于基体材料抗压强度分别提高33.2%,34.1%,31.1%,随温度升高也呈现先增大后减小。而构型复合材料的弹性模量变化不大。

关键词：粉末冶金热挤压铝基复合材料分级构型复合材料力学性能

Isothiocyanates Induce Apoptosis in Human Non-Small Cell Lung Cancer Cells through a Redox-Mediated Mechanism

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中国肺癌杂志 2009年第6期12卷 471-472页

作者： Ke XU Yu ZHU Xiang WU Huiqin yan qinghua ZHOU Tianjin Key Laboratory o fLung Cancer Metastasis and Tumor Microenviroment Tianjin Lung Cancer Institute Tianjin Medical University General Hospitalj Tianjin 300052 China

Purpose Lung cancer is one of the most aggressive cancer types, and is the leading cause of cancer-related deaths worldwide. Isothiocyanates are natural compounds found in

关键词：肺癌系统评价治疗紫极类药物

民国经济思想史研究综述——基于当代期刊论文视角

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河北经贸大学学报 2013年第3期34卷 89-94页

作者：李詹严清华武汉大学经济与管理学院湖北武汉430072

民国经济思想史作为中国经济思想史的重要部分,直到改革开放以后才逐渐受到学术界的重视。以当代期刊论文考察:民国经济思想史研究以人物经济思想研究为主,专题研究为辅而展开。但近年来有深入探讨民国经济学理论的趋势,研究视角和内容... 详细信息

民国经济思想史作为中国经济思想史的重要部分,直到改革开放以后才逐渐受到学术界的重视。以当代期刊论文考察:民国经济思想史研究以人物经济思想研究为主,专题研究为辅而展开。但近年来有深入探讨民国经济学理论的趋势,研究视角和内容不断扩展。但研究方法的多样性不足,理论框架的现代主流经济学特征不够明显。

关键词：民国经济思想史人物经济思想研究期刊论文专题研究理论框架学科体系

若干参数对内燃机曲柄滑动轴承润滑特性的影响

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润滑与密封 2005年第5期30卷 98-100页

作者：吕玮丽阎庆华安琦华东理工大学机械工程学院上海200237

将JFO边界条件引入曲柄滑动轴承的数值模拟计算过程,在成功求解Reynolds方程的基础上,选择一具体的内燃机曲柄滑动轴承进行了深入研究,探讨了若干因素对内燃机曲柄滑动轴承性能的影响。结果表明:采用JFO边界条件得出的轴心轨迹曲线与采... 详细信息

将JFO边界条件引入曲柄滑动轴承的数值模拟计算过程,在成功求解Reynolds方程的基础上,选择一具体的内燃机曲柄滑动轴承进行了深入研究,探讨了若干因素对内燃机曲柄滑动轴承性能的影响。结果表明:采用JFO边界条件得出的轴心轨迹曲线与采用雷诺边界条件求出的轨迹曲线在形状上十分相似,油膜厚度的变化曲线与载荷的变化过程是一致的,说明将JFO边界条件应用于曲柄滑动轴承的研究是完全可行的。

关键词：曲柄滑动轴承数值计算 JFO边界条件

ICP-AES法测定葡萄干中常微量元素含量

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食品与发酵工业 2009年第4期35卷 163-165页

作者：杨理闫清华河南科技学院实验中心河南新乡453003 新乡医学院生命科学技术系河南新乡453003

分别采用湿法、微波消解法处理样品,以电感耦合等离子体发射光谱仪(ICP-AES)检测不同等级的新疆吐鲁番葡萄干中Cu、Fe、Zn、Mn、Na、K、Ca、Mg、P等9种元素的含量,并优化微波处理样品条件。结果表明:葡萄干中Fe、Na、K、Ca、Mg、P等元... 详细信息

分别采用湿法、微波消解法处理样品,以电感耦合等离子体发射光谱仪(ICP-AES)检测不同等级的新疆吐鲁番葡萄干中Cu、Fe、Zn、Mn、Na、K、Ca、Mg、P等9种元素的含量,并优化微波处理样品条件。结果表明:葡萄干中Fe、Na、K、Ca、Mg、P等元素的含量较高,ICP-AES检测各元素的相对标准偏差为0.01%～4.90%,各元素回收率在98.15%～102.13%。无论湿法还是微波法消化样品,测定结果基本一致。采用微波消解技术和ICP-AES法结合测定常微量元素具有省时、省力、环境污染小,测定结果快速、准确等优点。

关键词： ICP—AES 常微量元素葡萄干