检索结果-南通市图书馆

Caledonian reworking of Paleoproterozoic basement in the Cathaysia Block: Constraints from zircon U-Pb dating, Hf isotopes and trace elements

引用

Chinese Science Bulletin 2008年第6期53卷 895-904页

作者： ZENG Wen ZHANG Li ZHOU HanWen ZHONG ZengQiu XIANG Hua LIU Rui JIN Song lu xinqian LI ChunZhong State Key Laboratory of Geological Processes and Mineral Resources Faculty of Earth Sciences China University of Geosciences (Wuhan) Wuhan 430074 China State Key Laboratory of Continental Dynamics Northwest University Xi'an 710069 China The 7th Geological Team of Zhejiang Province Lishui 323000 China

A combined study of zircon U-Pb dating, Hf isotopes and trace elements has been carried out for granodioritic neosomes of migmatites from the Tianjingping area in northwestern Fujian Province. Zircons are characterized by zoning, higher Th/U ratios (mostly ≥0.1), HREE enrichment, and positive Ce and negative Eu anomalies, and show features similar to magmatic or anatectic zircons. Apparent 206Pb/238U ages for the zircons are 447±2 Ma (95% conf., MSWD = 0.88), corresponding to a Caledonian event. εHf(t) values are ?13.3 to ?9.7, indicating a crustal source. Two-stage Hf model ages are 1.7 to 1.9 Ga, suggesting that protolith of the migmates was probably formed in the Paleoproterozoic. The granodioritic neosomes have the characteristics of peraluminous calc-alkaline granite, and their REE patterns and trace elements spidergrams show features of middle to upper crustal rocks. Together with previous studies, we conclude that the protolith of the Cathaysia basement in the Tianjingping area was likely formed in the middle-late Paleoproterozoic and experienced partial melting during the Caledonian period. The recognition of Caledonian reworking of the Paleoproterozoic basement in the Cathaysia Block provides a new insight into the tectonic evolution of the Cathaysia Block in the Caledonian pe- riod and the interaction between the Cathaysia Block and the Yangtze Block.

关键词：锆石测年法铪同位素示踪苏格兰地球化学

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mathematical model study on the damage of the liquid phase to productivity in the gas reservoir with a bottom water zone

引用

Petroleum 2018年第2期4卷 209-214页

作者： Xiaoliang Huang Xiao Guo xinqian lu Xiang Zhou Zhilin Qi Wende Yan Jiqiang Li College of Petroleum Engineering Southwest Petroleum UniversityChengdu610500China School of Petroleum Engineering Chongqing University of Science&TechnologyChongqing401331China Petroleum Systems Engineering Faculty of Engineering and Applied Science University of ReginaReginaS4S 0A2Canada

The production process in the gas reservoir with an aquifer is *** gas production,aquifer water could possibly flow into the production well and accumulate within the well bore,which leads to a lower production rate and may even block the ***,few studies in the literature investigate the damage caused by the liquid phase in this kind of reservoir or predict gas productivity using the relationship between reservoir pressure and water gas ratio(WGR).For this reason,it is important to know the effects of the formation of liquid phase behavior on production when an aquifer is present under a gas *** the results of published literature reviews,we found that studies focused on the production of a gas reservoir with bottom ***,for gas well damage from the liquid phase behavior,we found that there was no statistical data or mathematical model of the relationship between reservoir pressure and the gas oil ratio(GOR),which affects *** this research,based on the theory of fluid flow in porous media,a new mathematical model of water and gas production and a new equation on gas well productivity is *** verify the model and equation,gas production data collected from the field are *** analyzing the typical gas reservoir with bottom water and the collected data,influences from the liquid phase behavior are *** this way,mathematical relationships between reservoir pressure and the WGR and between the GOR and production decline were *** new gas productivity model is derived from the gas and water pseudo pressure functions,which can be applied to analyze well damage caused by the liquid *** order to verify the mathematical model,production data were collected from a typical gas reservoir with an aquifer located in the Changxing gas *** results indicate that a semi-logarithmic linear relationship is obtained between the WGR and productivity *** the WGR increases from 0.5 to

关键词： Mathematical model Liquid phase Well productivity Gas reservoir with an aquifer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of different doses of glucose and fructose on central metabolic pathways and intercellular wireless communication networks in humans

引用

Food Science and Human Wellness 2024年第4期13卷 1906-1916页

作者： Dingqiang lu Yujiao Liu Miao Zhao Shuai Yuan Danyang Liu xinqian Wang Yixuan Liu Yifei Zhang Ming Li Yufeng Lü Guangchang Pang Ruijuan Ren College of Biotechnology&Food Science Tianjin University of CommerceTianjin Key Laboratory of Food BiotechnologyTianjin 300314China Tianjin Institute for Food Safety Inspection Technology Tianjin 300134China

Fructose and glucose are often widely used in food processing and may contribute to many metabolic *** observe the effects of different doses of glucose and fructose on human metabolism and cellular communication,volunteers were given low,medium,and high doses of glucose and *** cytokines,glucose,lactate,nicotinamide adenine dinucleotide(NADH)and metabolic enzymes were assayed,and central carbon metabolic pathway networks and cytokine communication networks were *** results showed that the glucose and fructose groups basically maintained the trend of decreasing catabolism and increasing anabolism with increasing *** with glucose,low-dose fructose decreased catabolism and increased anabolism,significantly enhanced the expression of the inflammatory cytokine interferon-γ(IFN-γ),macrophage-derived chemokine(MDC),induced protein-10(IP-10),and eotaxin,and significantly reduced the activity of isocitrate dehydrogenase(ICDH)and pyruvate dehydrogenase complexes(PDHC).Both medium and high doses of fructose increase catabolism and anabolism,and there are more cytokines and enzymes with significant ***,multiple cytokines and enzymes show strong relevance to metabolic regulation by altering the transcription and expression of enzymes in central carbon metabolic ***,excessive intake of fructose should be reduced to avoid excessive inflammatory responses,allergic reactions and autoimmune diseases.

关键词： Fructose Glucose Central carbon metabolic pathway Metabolic enzymes Cytokine network

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Elevated peripheral levels of receptor-interacting protein kinase 1(RIPK1)and IL-8 as biomarkers of human amyotrophic lateral sclerosis

引用

Signal Transduction and Targeted Therapy 2024年第1期9卷 271-278页

作者： Jun Wei Min Li Zhi Ye xinqian Hu Xiaoyan He Jia Wang Gaofeng Chen Chengyu Zou Daichao Xu Hongbing Zhang Junying Yuan Yunhong Zha Institute of Neural Regeneration and Repair and Department of Neurology The First College of Clinical Medical ScienceYichang Central HospitalCollege of Basic Medical ScienceChina Three Gorges UniversityHubei Province Clinical Medical Research Center for Rare Diseases of Nervous SystemYichang 443000China Interdisciplinary Research Center on Biology and Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai Key Laboratory of Aging StudiesShanghai 201210China State Key Laboratory of Common Mechanism Research for Major Diseases Haihe Laboratory of Cell EcosystemDepartment of PhysiologyInstitute of Basic Medical Sciences and School of Basic MedicineChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijingChina

Amyotrophic lateral sclerosis(ALS)is a devastating fatal neurodegenerative disease with no ***-interacting protein kinase 1(RIPK1)has been proposed to mediate pathogenesis of *** has been identified as an old drug that can also inhibit RIPK1 *** conducted a drug-repurposing biomarker study of primidone as a RIPK1 inhibitor using SOD1G93A mice and ALS ***1G93A mice treated with primidone showed significant delay of symptomatic onset and improved motor ***-hundred-sixty-two ALS participants dosed daily with primidone(62.5 mg)completed 24-week follow-up.A significant reduction was showed in serum levels of RIPK1 and IL-8,which were significantly higher in ALS patients than that of healthy controls(Pluding COVID-19-associated cytokine release syndrome(CRS).(ChiCTR2200060149).

关键词： RIPK1 diseases Serum

来源：

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

New potential barite reference materials for LA-MC-ICP-MS sulfur isotope analysis with application to hydrothermal barite in the Huayangchuan deposit， western China

引用

Journal of Earth Science 2024年

作者： Jiali Fu xinqian He Zhaochu Hu Shuo Yin Jian Ma Kaiyun Chen Wen Zhang National Key Laboratory of Prospecting， Mining and Remote Sense Detecting on Uranium Resources， East China University of Technology State Key Laboratory of Nuclear Resources and Environment， East China University of Technology School of Earth Sciences， East China University of Technology State Key Laboratory of Geological Processes and Mineral Resources， China University of Geosciences Wuhan State Key Laboratory of Continental Dynamics， Department of Geo logy， Northwest University

Sulfur isotopes of S-bearing materials are powerful tools to trace various geological processes and sulfur sources in earth sciences， especially in ore deposits where sulfide-sulfate pair coprecipitates widely. However， in-situ S isotope determination of barite is challenging without natural matrix-matched reference material. In this study， we present two natural barite reference materials （1-YS and 294-YS） for in-situ sulfur isotopic analysis. Independent LA-MC-ICP-MS laboratories were utilized to test the δ34S micron-scale homogeneity of 1-YS and 294-YS barites that have 2s repeatabilities of better than ±0.45 ‰ and ±0.41 ‰， respectively. Meanwhile， the in-situ analysis results are consistent with the results of the bulk analysis by GS-IRMS within uncertainty. The grand mean δ34S values of 1-YS （13.37‰ ± 0.42 ‰， 2s） and 294-YS （14.38‰ ± 0.44 ‰， 2s） are the final recommended values obtained from four independent laboratories. All the results confirm the suitability of 1-YS and 294-YS barite used as calibration materials with respect to in-situ S isotopic analysis. Moreover， the new developed barite reference materials were used as matrix-matched standard to calibrate the barite samples from the Huayangchuan carbonatite-hosted U-polymetallic deposit （Qinling orogenic belt， western China） to obtain δ34S values. Utilizing the temperature-dependent δ34S fractionation of barite-pyrite pair， we calculate the formation temperature of barite （i.e.， 506 to 537 ℃） and the δ34S value of mineralizing fluid （i.e.， -7.11‰ to -7.59 ‰） in the Huayangchuan deposit. The results indicate an involvement of sedimentary sulfur， presumably acting as a potential uranium source （e.g.， upper crustal materials） for the giant Huayangchuan deposit.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

闽西北加里东期混合岩及花岗岩的成因：同变形地壳深熔作用

引用

岩石学报 2008年第6期24卷 1205-1222页

作者：刘锐张利周汉文钟增球曾雯向华靳松吕新前李春忠中国地质大学(武汉)地质过程与矿产资源国家重点实验室中国地质大学(武汉)地球科学学院武汉430074 西北大学大陆动力学国家重点实验室西安710069 浙江省第七地质大队丽水323000

本文选取闽西北前寒武纪变质基底中的混合岩和花岗岩为研究对象,以探讨两者之间的成因联系。详细的岩石学和主量、微量元素地球化学以及锆石 U-Pb 年代学研究表明,闽西北混合岩是同变形地壳深熔作用的产物,基底变质岩中的黑云母在较低温... 详细信息

本文选取闽西北前寒武纪变质基底中的混合岩和花岗岩为研究对象,以探讨两者之间的成因联系。详细的岩石学和主量、微量元素地球化学以及锆石 U-Pb 年代学研究表明,闽西北混合岩是同变形地壳深熔作用的产物,基底变质岩中的黑云母在较低温(约800℃)、H_2O 不饱和的条件下发生脱水熔融反应产生熔体,构造变形作用在熔体的分离和迁移过程中起到了重要作用。闽西北基底变质岩可能为形成混合岩和花岗岩的源岩,其深熔产生的初始熔体发生结晶分异作用,堆晶产物形成了混合岩的浅色体,而残余熔体继续演化形成花岗岩。混合岩和相关花岗岩形成基本同时,其成岩年龄为437～441Ma,它们均为华南加里东期构造热事件的产物。

关键词：混合岩花岗岩同变形地壳深熔作用堆晶加里东期闽西北华南

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

NiMo/Al_(2)O_(3)催化剂活性组分分布调控及其加氢脱硫应用

引用

化工进展 2024年第8期43卷 4393-4402页

作者：王嘉李文翠吴凡高新芊陆安慧大连理工大学化工学院精细化工国家重点实验室辽宁大连116024

渣油加氢为扩散限制反应,当活性组分集中分布在催化剂颗粒外层,能有效减少反应物在催化剂中的扩散阻力,提升催化活性。本文利用氧化铝载体表面性质差异,调变活性金属在载体上的吸附强弱。采用X射线衍射、红外、钼平衡吸附法、接触角等... 详细信息

渣油加氢为扩散限制反应,当活性组分集中分布在催化剂颗粒外层,能有效减少反应物在催化剂中的扩散阻力,提升催化活性。本文利用氧化铝载体表面性质差异,调变活性金属在载体上的吸附强弱。采用X射线衍射、红外、钼平衡吸附法、接触角等表征手段分析载体表面性质。实验结果表明,含有更多碱性羟基的载体会对活性金属产生强吸附,降低浸渍过程活性组分在孔内的扩散速率。通过调控吸附与扩散速率,促进了蛋壳催化剂的形成,实现活性组分可控分布。模型化合物二苯并噻吩的脱硫反应性能评价结果表明,蛋壳催化剂上金属-载体相互作用更弱,利于形成高活性的Ⅱ型Ni-Mo-S活性相,同时蛋壳结构减少了扩散阻力,催化剂表观脱硫率为79.3%,比活性为均匀分布催化剂的1.2倍。

关键词：氧化铝蛋壳催化剂表面性质加氢脱硫吸附

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

高校音乐教育铸牢中华民族共同体意识的使命任务与实践路径

引用

西北民族大学学报（哲学社会科学版） 2024年第2期 67-75页

作者：李欣倩北京科技大学人文素质教育中心北京100083

中华民族音乐作为各民族情感交流和传承中华文化的重要载体,在铸牢中华民族共同体意识中发挥着独特作用。在新的历史时期,高校音乐教育既要承担起培养具有爱国主义精神和为民族复兴伟业施展才华的时代新人,还应当肩负起强化“五个认同... 详细信息

中华民族音乐作为各民族情感交流和传承中华文化的重要载体,在铸牢中华民族共同体意识中发挥着独特作用。在新的历史时期,高校音乐教育既要承担起培养具有爱国主义精神和为民族复兴伟业施展才华的时代新人,还应当肩负起强化“五个认同”、传承与创新中华民族音乐的重要使命。本文从民族音乐在铸牢中华民族共同体意识中的作用出发,分析高校在音乐教学研究中的使命与任务,开拓高校音乐教育铸牢中华民族共同体意识的实践路径,让民族音乐教育在新时代更好地为铸牢中华民族共同体意识作出积极的贡献。

关键词：高校音乐教育民族音乐铸牢中华民族共同体意识

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

造核-包衣法制备Al_(2)O_(3)小球及其在丙烷直接脱氢反应中的应用研究

引用

低碳化学与化工 2024年第2期49卷 49-59页

作者：陈执吴凡高新芊贺雷陆安慧大连理工大学化工学院精细化工国家重点实验室辽宁省低碳资源高值化利用国家重点实验室辽宁大连116024

氧化铝(Al_(2)O_(3))载体是应用最广泛的催化剂的核心材料之一,而球形Al_(2)O_(3)载体取代条形Al_(2)O_(3)载体已成为大趋势,因此亟需发展绿色可行的制备球形Al_(2)O_(3)载体新方法。首先对滚球法进行了优化,以拟薄水铝石粉体为原料,硝... 详细信息

氧化铝(Al_(2)O_(3))载体是应用最广泛的催化剂的核心材料之一,而球形Al_(2)O_(3)载体取代条形Al_(2)O_(3)载体已成为大趋势,因此亟需发展绿色可行的制备球形Al_(2)O_(3)载体新方法。首先对滚球法进行了优化,以拟薄水铝石粉体为原料,硝酸为胶溶剂,羟丙基甲基纤维素为粘结剂,采用造核-包衣法制备了球形度好、强度高且比表面积大的Al_(2)O_(3)小球。结合X射线衍射(XRD)、扫描电子显微镜(SEM)等表征手段考察了水粉比(质量比)、酸粉比(质量比)、粘结剂含量(质量分数)和抛丸时间对Al_(2)O_(3)小球的强度和孔结构的影响。结果表明,控制酸粉比为0.050、水粉比为0.88、粘结剂含量为3%(质量分数)和每次抛丸时间为5 min,能够制备出粒径均匀、成品率高且强度高达43.0 N的Al_(2)O_(3)小球。在此基础上,制备了球形和粉末PtSn/Al_(2)O_(3)催化剂,并在温度为618℃、H_(2)和C_(3)H_(8)流量分别为3.6 mL/min和6.0 mL/min的条件下应用于丙烷直接脱氢反应,发现球形PtSn/Al_(2)O_(3)催化剂表现出与粉末PtSn/Al_(2)O_(3)催化剂接近的反应活性和选择性。造核-包衣法是一种绿色高效的制备球形Al_(2)O_(3)载体的方法,可为球形Al_(2)O_(3)载体国产化提供新的思路。

关键词： Al_(2)O_(3)小球造核-包衣法 Al_(2)O_(3)成型强度丙烷直接脱氢

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

外部经济不确定性与中国家庭经济活动

引用

统计与信息论坛 2024年第2期39卷 29-42页

作者：李小平杜昕倩田璞中南财经政法大学经济学院湖北武汉430070

当今世界,国外环境日趋复杂,不确定性因素明显增加,将对中国家庭经济活动产生深远影响。在测算中国面临的外部经济不确定性的基础上,利用中国家庭金融调查数据(CHFS)和分位数回归方法,实证研究了外部经济不确定性对中国家庭收入、消费... 详细信息

当今世界,国外环境日趋复杂,不确定性因素明显增加,将对中国家庭经济活动产生深远影响。在测算中国面临的外部经济不确定性的基础上,利用中国家庭金融调查数据(CHFS)和分位数回归方法,实证研究了外部经济不确定性对中国家庭收入、消费和风险资产配置的影响。研究发现:外部经济不确定性对家庭总收入和家庭总消费均存在显著的负向作用,且这种负向作用随着收入水平和消费水平的提高而增大;外部经济不确定性对不同消费水平群体的家庭耐用品消费均有明显的负向影响,对中等消费水平群体的负面影响最大。此外,外部经济不确定性对中国家庭收入和消费的影响表现出区域差异性和城乡差异性,在外向型产业占比更大的东部地区和经济发展水平较低的农村地区,家庭收入和消费受到外部经济不确定性的冲击更大。而拥有社会保险或商业保险是缓解外部经济不确定性对家庭经济活动负面影响的重要调节方式。进一步分析表明,当家庭面临更大的外部经济不确定性时,会减少对风险资产的持有,增加持有无风险资产。

关键词：外部经济不确定性家庭总收入家庭总消费耐用品消费风险资产配置

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：