检索结果-南通市图书馆

Cooling History of Mesozoic Magmatism and Implications for Large-Scale Gold Mineralization in the Jiaodong Peninsula, East China: Constraints from T-t Paths Determined by U-Pb Thermochronology of Zircon and Apatite

引用

Journal of Earth Science 2024年第3期35卷 878-889页

作者： guangyan zhou Mingchun Song Long Li Yan Luo DGraham Pearson Jianbo zhou Zhengjiang Ding Xuefeng Yu Yingxin Song Jie Li Shiyong Li Faculty of Earth Sciences China University of GeosciencesWuhan 430074China Department of Earth&Atmospheric Sciences University of AlbertaEdmontonAlberta T6G 2E3Canada Hebei Key Laboratory of Strategic Critical Mineral Resources Hebei GEO UniversityShijiazhuang 050031China Shandong Provincial No.6 Exploration Institute of Geology and Mineral Resources Weihai 264209China College of Earth Sciences Jilin UniversityChangchun 130061China Ministry of Natural Resources Key Laboratory of Gold Mineralization Processes and Resources Utilization Key Laboratory of Metallogenic-Geologic Processes and Comprehensive Utilization of Minerals Resources in Shandong ProvinceShandong Institute of Geological SciencesJinan 250013China Shandong Nuclear Industry Geological Group 273 Yantai 264006China

The Mesozoic intrusions of the Jiaodong Peninsula,eastern China,host giant gold deposits.Understanding the genesis of these deposits requires the determination of the source of the parental auriferous fluid and the timing of gold mineralization,which are strongly influenced by the cooling/uplift histories of the hosting intrusions.We performed an integrated U-Pb geochronology study on both zircon and apatite from four major magmatic episodes of the Jiaodong Peninsula.The zircon and apatite U-Pb ages are 156.9±1.2 and 137.2±2.4 Ma for the Linglong intrusion,129.9±1.0 and 125.0±3.8 Ma for the Qujia intrusion,119.5±0.7 and 117.2±1.8 Ma for the Liulinzhuang intrusion,118.6±1.0 and 111.6±1.6 Ma for the Nansu intrusion,respectively.The coupled zircon and apatite data of these granitoids indicate a slow cooling rate(11.9°C/Ma)in the Late Jurassic,and rapid uplift and cooling(35.8-29.2°C/Ma)in the Early Cretaceous.The dramatically increased uplift and cooling period in the Early Cretaceous are contemporaneous with large-scale gold mineralization in the Jiaodong Peninsula.This implies that thermal upwelling of asthenosphere and related tectonic extension played an important role in gold remobilization and precipitation.

关键词： magmatism geochronology zircon apatite gold deposits Jiaodong Peninsula

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

Super solutions of the model RB

引用

Frontiers of Computer Science 2022年第6期16卷 191-193页

作者： guangyan zhou Wei XU Department of Mathematics Beijing Technology and Business UniversityBeijing 100048China School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China

1 Introduction Constraint satisfaction problems(CSPs)have come to play a prominent role in the area of computer science,statistical physics and information theory.A CSP instance involves a set of variables and a set of constraints,and the task is to find a solution(an assignment of variables that satisfies all the constraints)or to prove the unsolvability.Model RB[1]is a CSP model proposed to overcome the trivial unsatisfiability of standard Model B[2].

关键词： theory. constraints trivial

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

Effects of Transdermal Estrogen Therapy on Expressions of Estrogen Receptors and T-lymphocyte Apoptosis in Surgically Menopausal Women

引用

Cellular & Molecular Immunology 2009年第4期6卷 277-283页

作者： Jing Zhang Xing Chen Shaofen Zhang guangyan zhou Xian Xia Liming Lu Department of Gynecology Obstetrics and Gynecology Hospital FudanUniversity Shanghai 200011 China Shanghai Institute of Immunology Shanghai Jiaotong University Shanghai200025 China Department of Gynecology Obstetrics and Gynecology Hospital Fudan University 419 Fangxie Road Shanghai 200011China

Studies have demonstrated estrogen replacement therapy can improve the life quality of surgically menopausal women. However, the mechanisms in this process remain poorly defined. Here we show the effect of transdermal estrogen therapy on expressions of estrogen receptors and T-lymphocyte apoptosis in surgically postmenopausal women. Fifteen surgically menopausal women, 15 naturally menopausal women and 15 young women were chosen in our studies. Peripheral vein blood was collected and serum E2 and FSH levels were assessed using ACCESS. T-lymphocyte apoptosis and the expressions of Fas, FasL and ER subtypes α and β were determined. The serum E2 levels of surgically menopausal woman were significantly higher, and the ＂Improved Kupperman Index＂ and the scores of ＂Menopause Specific Quality of Life Questionnaire＂ in surgically menopausal women were significantly low after ERT. The rates of T-lymphocyte apoptosis and FasL expression in surgically menopausal women were decreased after ERT, but the difference was not significant. The expressions of ERa and ERβ in two menopausal groups were significantly lower than those of the young group. They were both significantly up-regulated after 3 months of ERT. Transdermal ERT could significantly upregulate the serum E2 level, could improve menopausal symptoms and life quality of surgically menopausal women and upregulate ERa and ERβ expressions on T lymphocytes, especially ERp. Thus, the low dose of transdermal ERT may have a protective effect on menopausal women＇s immune function and aging.

关键词： estrogen replacement therapy surgical menopause estrogen receptor T-lymphocyte apoptosis

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

Cooling history of Mesozoic magmatism and implications for large-scale gold mineralization in the Jiaodong Peninsula， East China: Constraints from T-t paths determined by U-Pb thermochronology of zircon and apatite

引用

Journal of Earth Science 2023年

作者： guangyan zhou Mingchun Song Long Li Yan Luo D.Graham Pearson Jianbo zhou Zhengjiang Ding Xuefeng Yu Yingxin Song Jie Li Shiyong Li Faculty of Earth Sciences China University of Geosciences Wuhan Shandong Nuclear Industry Geological Group 273 Department of Earth & Atmospheric Sciences University of Alberta Key Laboratory of Metallogenic-Geologic Processes and Comprehensive Utilization of Minerals Resources in Shandong Province Shandong Institute of Geological Sciences Hebei Key Laboratory of Strategic Critical Mineral Resources Hebei GEO University College of Earth Sciences Jilin University Ministry of natural resources Key Laboratory of Gold Mineralization Processes and Resources Utilization Shandong Provincial No.6 Exploration Institute of Geology and Mineral Resources

The Mesozoic intrusions of the Jiaodong Peninsula， eastern China， host giant gold deposits. Understanding the genesis of these deposits requires the determination of the source of the parental auriferous fluid and the timing of gold mineralization， which are strongly influenced by the cooling/uplift histories of the hosting intrusions. We performed an integrated U-Pb geochronology study on both zircon and apatite from the four major magmatic episodes of the Jiaodong Peninsula. The zircon and apatite U-Pb ages are 156.9 ± 1.2 Ma and 137.2 ± 2.4 Ma for the Linglong intrusion， 129.9 ± 1.0 Ma and 125.0 ±3.8 Ma for the Qujia intrusion， 119.5 ± 0.7 Ma and 117.2 ± 1.8 Ma for the Liulinzhuang intrusion， 118.6 ± 1.0 Ma and 111.6 ±1.6 Ma for the Nansu intrusion， respectively. The coupled zircon and apatite data of these granitoids indicate a slow cooling rate (11.9 °C/Ma) in the Late Jurassic and rapid uplift and cooling (35.8-29.2 °C/Ma) in the Early Cretaceous. The dramatically increased uplift and cooling period in the Early Cretaceous is contemporaneous with large-scale gold mineralization in the Jiaodong Peninsula. This implies that thermal upwelling of asthenosphere and related tectonic extension played an important role in gold remobilization and precipitation.

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

我国非高炉炼铁的现状与发展

引用

山东冶金 2024年第2期46卷 7-10页

作者：李翠郭会良玄振法纪召毅周光燕山东泰山钢铁集团有限公司山东济南271100

介绍了非高炉炼铁的发展现状,并对非高炉炼铁的主要工艺进行了说明,包括直接还原法和熔融还原法。重点对回转窑工艺、竖炉工艺、COREX工艺、FINEX工艺进行了详细的介绍,指出非高炉炼铁技术在资源利用效率、环境友好性、产业发展潜力等... 详细信息

介绍了非高炉炼铁的发展现状,并对非高炉炼铁的主要工艺进行了说明,包括直接还原法和熔融还原法。重点对回转窑工艺、竖炉工艺、COREX工艺、FINEX工艺进行了详细的介绍,指出非高炉炼铁技术在资源利用效率、环境友好性、产业发展潜力等方面具有广阔的发展前景。

关键词：非高炉炼铁现状工艺直接还原

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

The Complex Record of Tectonothermal Events and Crustal Evolution Revealed by Multiple Detrital Minerals from Modern Rivers in Northern China

The Complex Record of Tectonothermal Events and Crustal Evol...

引用

中国矿物岩石地球化学学会第17届学术年会

作者： guangyan zhou Yuanbao Wu State Key Laboratory of Geological Processes and Mineral Resources Faculty of Earth Sciences China University of Geosciences

＜正＞Detrital zircons have been widely employed to investigate regional tectonothermal events and crustal growth. However, recent suggestions of the sampling bias of this method in representing provenance information...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

安龙县紫陀螺菌促繁、规范采收和科学留种技术

引用

耕作与栽培 2024年第1期44卷 141-142页

作者：周光燕张贵合王名炜苏跃陶文广万俊杰戴燚贺栾劲芝贵州农业职业学院贵阳551400

紫陀螺菌为云南鼠刺等树木共生的外生菌根菌,具有较高的食用价值和药用价值。本文通过浅析安龙县紫陀螺菌的促繁、规范采收和科学留种技术,以期为野生食用菌抚育开发思路奠定基础,进一步保护野生资源,推动当地林下经济的发展。

关键词：紫陀螺菌促繁规范采收科学留种

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

High-fat diet impairs gut barrier through intestinal microbiota-derived reactive oxygen species

引用

Science China(Life Sciences) 2024年第5期67卷 879-891页

作者： Nianyi Zeng Fan Wu Junqi Lu Xiang Li Shaomei Lin Lang zhou Zhongwei Wang guangyan Wu Qingfa Huang Daowen Zheng Jie Gao Shan Wu Xiaojiao Chen Muxuan Chen Fanguo Meng Haitao Shang Yan He Peng Chen Hong Wei Zhuang Li Hongwei zhou Microbiome Medicine Center Department of Laboratory MedicineZhujiang HospitalSouthern Medical UniversityGuangzhou 510282China Department of Environmental Health Guangdong Provincial Key Laboratory of Tropical Disease ResearchSchool of Public Health and Tropical MedicineSouthern Medical UniversityGuangzhou 510515China Redox Medical Center for Public Health Soochow UniversitySuzhou 215301China Precision Medicine Institute The First Affiliated HospitalSun Yat-sen UniversityGuangzhou 510080China Department of Pathophysiology Guangdong Provincial Key Laboratory of ProteomicsSchool of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510515China

Gut barrier disruption is a key event in bridging gut microbiota dysbiosis and high-fat diet(HFD)-associated metabolic disorders.However,the underlying mechanism remains elusive.In the present study,by comparing HFD-and normal diet(ND)-treated mice,we found that the HFD instantly altered the composition of the gut microbiota and subsequently damaged the integrity of the gut barrier.Metagenomic sequencing revealed that the HFD upregulates gut microbial functions related to redox reactions,as confirmed by the increased reactive oxygen species(ROS)levels in fecal microbiota incubation in vitro and in the lumen,which were detected using in vivo fluorescence imaging.This microbial ROS-producing capability induced by HFD can be transferred through fecal microbiota transplantation(FMT)into germ-free(GF)mice,downregulating the gut barrier tight junctions.Similarly,mono-colonizing GF mice with an Enterococcus strain excelled in ROS production,damaged the gut barrier,induced mitochondrial malfunction and apoptosis of the intestinal epithelial cells,and exacerbated fatty liver,compared with other low-ROS-producing Enterococcus strains.Oral administration of recombinant high-stability-superoxide dismutase(SOD)significantly reduced intestinal ROS,protected the gut barrier,and improved fatty liver against the HFD.In conclusion,our study suggests that extracellular ROS derived from gut microbiota play a pivotal role in HFD-induced gut barrier disruption and is a potential therapeutic target for HFD-associated metabolic diseases.

关键词： fatty liver disease gut microbiota gut barrier high-fat diet oxidative stress reactive oxygen species

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

基于微纳米气泡强化的槽式超声反应器制备纳米乳液

引用

中国油脂 2022年第11期47卷 98-102,142页

作者：张宗波饶云龙周广岩中国石油大学(华东)机电工程学院山东青岛266555

为开发工业制备纳米乳液新技术,通过仿真实验分析在槽式超声反应器中引入微纳米气泡对声场强度和分布的影响。以花生油为油相,吐温80和司盘80为乳化剂,在乳化过程中采用基于微纳米气泡强化的槽式超声反应器制备纳米乳液。利用正交实验... 详细信息

为开发工业制备纳米乳液新技术,通过仿真实验分析在槽式超声反应器中引入微纳米气泡对声场强度和分布的影响。以花生油为油相,吐温80和司盘80为乳化剂,在乳化过程中采用基于微纳米气泡强化的槽式超声反应器制备纳米乳液。利用正交实验探索了超声时间、进气量、复合乳化剂添加量对纳米乳液平均粒径与多分散指数的影响,并优化了纳米乳液制备条件。结果表明:加入适量微纳米气泡会提高声场强度和分布均匀性;制备纳米乳液的最优条件为超声时间12 min、进气量150 mL/min、复合乳化剂添加量3%(以水的体积计),在此条件下乳液平均粒径为190.9 nm,多分散指数为0.178,较未加入微纳米气泡所制备乳液的平均粒径减小73.3%,且表现出更好的动力学稳定性。该方法制备的纳米乳液平均粒径和多分散指数均较小,且具有快速、体量大、成本低的生产优势。

关键词：超声乳化纳米乳液微纳米气泡

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

小样本驱动特征分段网络的防护材料折痕检测

引用

兵工学报 2024年第3期45卷 963-974页

作者：刘梦真黄广炎张宏周宏元刘思宇北京理工大学爆炸科学与技术国家重点实验室北京100081 北京理工大学重庆创新中心现代兵器技术实验室重庆401120 北京理工大学爆炸防护与应急处置技术教育部工程研究中心北京100081 北京工业大学城市建设学部北京100124 北京理工大学生命学院北京100081

防刺服能在恐怖袭击、医闹伤害、违法犯罪等事件中有效保护生命安全,然而在生产制造及穿着使用中易产生机械折痕。立足于防护材料折痕缺陷的快速检测需求,创新性地在图像识别方法中提出特征分段网络结构,实现了小样本驱动下防护材料折... 详细信息

防刺服能在恐怖袭击、医闹伤害、违法犯罪等事件中有效保护生命安全,然而在生产制造及穿着使用中易产生机械折痕。立足于防护材料折痕缺陷的快速检测需求,创新性地在图像识别方法中提出特征分段网络结构,实现了小样本驱动下防护材料折痕的快速、精准检测功能。通过引入注意力机制和深度可分离卷积模块,并赋予损失函数与优化器两种典型参数,全面提高了特征分段网络模型的检测精度与效率;提出几何信息标注算法,搭建防护材料缺陷可视化检测平台,实现了机械折痕自动精准定位与几何信息输出。模型训练结果表明,特征分段网络模型的准确率可达96.19%,折痕缺陷几何信息标注误差在2%以内,优异的可视化检测功能可拓展到大型工程化自动检测领域。研究工作为下一步构建含有折痕缺陷的防刺装备防护性能预测模型奠定了基础。

关键词：防护材料机械折痕检测特征分段神经网络几何信息标注

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

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：