检索结果-南通市图书馆

The focal depths of the 2008 Panzhihua earthquake sequence and the stress field in the source region

Science China Earth Sciences 2020年第3期63卷 439-451页

作者： Yan LUO Li zhao Jianhui tian Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingCEABeijing 100036China School of Earth and Space Sciences Peking UniversityBeijing 100871China

Focal depths of the 2008 Ms6.1 Panzhihua earthquake sequence and tectonic stress field in the source area are *** depths of 24 earthquakes in Panzhihua earthquake sequence with a magnitude M≥3.0 were determined using the seismic depth phase sPL;additionally,the focal depths of 232 earthquakes were measured by fitting the threecomponent waveforms of the P and S *** source depth of the main shock is^12 *** majority of the aftershocks with magnitude M≥3.0 occurred in the brittle upper crust at the depths range of 12-18 ***,the Source mechanisms of the 232events around the Panzhihua earthquake source area were determined,and the results show that the earthquakes have predominantly strike-slip mechanisms in the Dianzhong Block,but display complexity of the focal mechanisms outside and near the boundary of the Dianzhong *** 232 earthquake mechanisms from this study are combined with the solutions from the Global Centroid Moment Tensor (GCMT) catalog to derive 2D stress *** inversion results show that the Dianzhong block is predominantly under a strike slip faulting regime and the direction of the maximum principal compressionσ1 is northwestsoutheast (NW-SE)-*** distribution is coincide with GPS velocity ***,orientations of principal stress axes as well as the faulting types change outside and near the Dianzhong *** results show that the tectonic stress field in the study area is predominantly controlled by the southeast (SE)-trending horizontal movement and clockwise rotation of the Dianzhong block as a result of the eastward movement of eastern Tibetan meeting the old and rigid South China block (SCB).The Panzhihua earthquake ruptured at^12 km depth where the tectonic stress regime is under the SE-direction horizontal compression and the NE-direction horizontal extension.

关键词： Panzhihua earthquake sequence Depth phase Focal mechanism solution Tectonic stress field

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

Variable scale-convex-peak method for weak signal detection

引用

Science China(Technological Sciences) 2021年第2期64卷 331-340页

作者： tian RuiLan zhao ZhiJie XU Yong State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Engineering Mechanics Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Applied Mathematics Northwestern Polytechnical UniversityXi’an 710072China

Avariable scale-convex-peak method is constructed to identify the frequency of weak harmonic signal. The key of this method is to find a set of optimal identification coefficients to make the transition of dynamic behavior topologically persistent. By the stochastic Melnikov method, the lower bound of the chaotic threshold continuous function is obtained in the mean-square *** intermediate value theorem is applied to detect the optimal identification coefficients. For the designated identification system, there is a valuable co-frequency-convex-peak in bifurcation diagram, which indicates the state transition of chaosperiod-chaos. With the change of the weak signal amplitude and external noise intensity in a certain range, the convex peak phenomenon is still maintained, which leads to the identification of frequency. Furthermore, the proposition of the existence of reversible scaling transformation is introduced to detect the frequency of the harmonic signal in engineering. The feasibility of constructing the hardware and software platforms of the variable scale-convex-peak method is verified by the experimental results of circuit design and the results of early fault diagnosis of actual bearings, respectively.

关键词： variable-scale Duffing system stochastic Melnikov method scale transformation circuit experiment fault diagnosis

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

Surface plasmon-enhanced photochemical reactions on noble metal nanostructures

引用

Science China Chemistry 2015年第4期58卷 574-585页

作者： De-yin Wu Meng Zhang Liu-Bin zhao yi-Fan Huang Bin Ren Zhong-Qun tian State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Collaborative Innovation Center of Chemistry for Energy Materials Xiamen University

Nanoscale noble metals can exhibit excellent photochemical and photophysical properties, due to surface plasmon resonance(SPR) from specifically collective electronic excitations on these metal surfaces. The SPR effect triggers many new surface processes, including radiation and radiationless relaxations. As for the radiation process, the SPR effect causes the significant focus of light and enormous enhancement of the local surface optical electric field, as observed in surface-enhanced Raman spectroscopy(SERS) with very high detection sensitivity(to the single-molecule level). SERS is used to identify surface species and characterize molecular structures and chemical reactions. For the radiationless process, the SPR effect can generate hot carriers, such as hot electrons and hot holes, which can induce and enhance surface chemical reactions. Here, we review our recent work and related literature on surface catalytic-coupling reactions of aromatic amines and aromatic nitro compounds on nanostructured noble metal surfaces. Such reactions are a type of novel surface plasmon-enhanced chemical reaction. They could be simultaneously characterized by SERS when the SERS signals are assigned. By combining the density functional theory(DFT) calculations and SERS experimental spectra, our results indicate the possible pathways of the surface plasmonenhanced photochemical reactions on nanostructures of noble metals. To construct a stable and sustainable system in the conversion process of the light energy to the chemical energy on nanoscale metal surfaces, it is necessary to simultaneously consider the hot electrons and the hot holes as a whole chemical reaction system.

关键词： surface plasmon resonance plasmon-enhanced chemical reaction p-aminothiophenol density functional theory noble metal nanostructures

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

Finite-Time Synchronization of Complex Networks With Intermittent Couplings and Neutral-Type Delays

引用

IEEE/CAA Journal of Automatica Sinica 2023年第10期10卷 2026-2028页

作者： Engang tian yi Zou Hongtian Chen School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China

Dear Editor, This letter focuses on the finite-time synchronization(FTS) of neutral-type complex networks with intermittent couplings. Different from most of the existing references concerning neutral-type systems,a delay-independent dynamical event-triggering controller is considered, operating the same way as the intermittent coupling and excluding the Zeno behavior naturally.

关键词： neutral letter concerning

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

2013-2023年广安市HIV感染者及AIDS患者死亡病例分析

引用

中国麻风皮肤病杂志 2025年第1期41卷 23-28页

作者：田彩虹秦小佳张军龚毅赵智蓉广安市疾病预防控制中心四川广安638000 四川省疾病预防控制中心四川成都610000 昆明市第三人民医院云南昆明650200

收集2013-2023年国家艾滋病综合防治信息系统报告的广安市HIV/AIDS病例资料,运用Logistic回归模型分析HIV/AIDS病例死亡的影响因素。结果示广安市2013-2023年累计报告HIV/AIDS病例8803例,死亡2489例,病死率为28.27%。死亡病例中,AIDS占6... 详细信息

收集2013-2023年国家艾滋病综合防治信息系统报告的广安市HIV/AIDS病例资料,运用Logistic回归模型分析HIV/AIDS病例死亡的影响因素。结果示广安市2013-2023年累计报告HIV/AIDS病例8803例,死亡2489例,病死率为28.27%。死亡病例中,AIDS占61.91%,男性占86.86%,确诊年龄在55岁及以上占68.62%,农民占72.32%,有配偶占55.56%,小学以下文化程度占74.25%,异性性传播占95.22%,医疗机构来源占73.04%,首次CD4^(+)T淋巴细胞未查者和小于200个/μL占62.43%,未行抗病毒治疗(antiretroviral therapy,ART)和ART不及时者占66.05%。多因素Logistic回归分析结果显示,HIV、女性、有配偶、来源于非医疗机构、确诊年龄<35岁、治疗及时的病例死亡概率较低;文化程度为小学及以下、确诊年龄≥55岁、首次就诊未检查CD4^(+)T淋巴细胞、未治疗的病例死亡概率较高。不论是HIV感染者还是AIDS患者,治疗组存活时长显著高于未治疗组(P<0.05)。

关键词：获得性免疫缺陷综合征死亡病例特征抗病毒治疗

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

An isopentyl transferase gene driven by the senescence-inducible SAG12 promoter improves salinity stress tolerance in cotton

引用

Journal of Cotton Research 2019年第3期2卷 133-141页

作者： SHAN yi zhao Peng LIU zhao LI Fangjun tian Xiaoli College of Agronomy and Biotechnology China Agricultural University

Background:Soil salinity seriously affects cotton growth,leading to the reduction of yield and fiber ***,genetic engineering has become an efficient tool to increase abiotic stress tolerance in ***:In this study,isopentyl transferase(IPT),a key enzyme involved in cytokinin(CTK) biosynthesis from Agrobacterium tumefaciens,was selected to generate transgenic cotton via Agrobacterium-mediated transformation.A senescence-inducible SAG12 promoter from Arabidopsis was fused with the IPT ***-expression of SAG12::IPT significantly promoted seed germination or seedling tolerance to salt *** IPTtransgenic lines,OE3 as a tolerant line during seed germination,and OE8 as a tolerant line at seedling stage,were selected for further physiological *** data showed that ectopic-expression of SAG12::IPT induced the accumulation of CTKs not only in leaves and roots,but also in germinating ***,ectopic-expressing IPT increased the activity of antioxidant enzymes,which was associated with the less reactive oxygen species(ROS) accumulation compared with control ***,ectopic-expression of IPT produced higher K^+/Na^+ratio in cotton shoot and root Conclusion:The senescence-induced CTK accumulation in cotton seeds and seedlings positively regulates salt stress partially by elevating ROS scavenging capability.

关键词： Isopentyl transferase(IPT) Cytokinin(CTK) Transgenic Salt tolerance Cotton

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

An Experimental Study on the Effect of a Nanofluid on Oil-Water Relative Permeability

引用

Fluid Dynamics & Materials Processing 2024年第6期20卷 1265-1277页

作者： Hui tian Dandan zhao Yannan Wu Xingyu yi Jun Ma Xiang Zhou Baikouquan Oil Production Plant PetroChina Xinjiang Oilfield CompanyKaramay834000China Research Institute of Petroleum Exploration Development PetroChina Liaohe OilfieldPanjin124010China Petroleum Engineering School Southwest Petroleum UniversityChengdu610500China Oil and Gas Development Haosheng Xincheng Energy TechnologyLtd.of SicuanChengdu610213China

The low porosity and low permeability of tight oil reservoirs call for improvements in the current technologies for oil *** chemical solutions with large molecular size cannot effectively flow through the nanopores of the *** this study,the feasibility of Nanofluids has been investigated using a high pressure high temperature core-holder and nuclear magnetic resonance(NMR).The results of the experiments indicate that the specified Nanofluids can enhance the tight oil recovery *** water and oil relative permeability curve shifts to the high water saturation side after Nanofluid flooding,thereby demonstrating an increase in the water wettability of the *** the Nanofluid flooding process the oil recovery was enhanced by 15.1%,compared to waterflooding *** T2 spectra using the NMR show that after Nanofluid flooding,a 7.18%increment in oil recovery factor was gained in the small pores,a 4.9%increase in the middle pores,and a 0.29%increase in the large *** results confirm that the Nanofluids can improve the flow state in micro-sized pores inside the core and increase the ultimate oil recovery factor.

关键词： Tight oil reservoir nanofluid relative permeability nuclear magnetic resonance T2 spectrum

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

素养导向下高中语文关键能力测评的道法技

引用

教学与管理 2025年第1期 58-62页

作者：王江锋赵伟闻天阳浙江师范大学教育学院浙江金华321004 聊城大学教育科学学院山东聊城252000

素养导向的高中语文关键能力测评旨在检测高中生语文学习之“道”“法”“技”的状况。然而,现实的高三语文复习教学却热衷于语文试题之“器”,执迷于答题模板、得分妙招之类的习得,热衷于机械记忆各种语文知识点,而忽视语文学习之“法... 详细信息

素养导向的高中语文关键能力测评旨在检测高中生语文学习之“道”“法”“技”的状况。然而,现实的高三语文复习教学却热衷于语文试题之“器”,执迷于答题模板、得分妙招之类的习得,热衷于机械记忆各种语文知识点,而忽视语文学习之“法”。其实,高中语文关键能力测评应以“融入知识迁移的建构主义”为道,以“基于学科能力的关键能力”为法,以“依托教育测量学理论”为技,避免崇器轻道、重器忽法、贵器怠术等不良现象。以道驭法,为迁移而教;以法固道,为问题解决而学;以技达道,为规律而研,最终实现“道法技器”四元合一。

关键词：素养导向高中语文关键能力测评道法技

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

AMF siRNA treatment of keloid through inhibition signaling pathway of RhoA/ROCK1

引用

Genes & Diseases 2019年第2期6卷 185-192页

作者： yi tian Lan Jin Wenhong Zhang Zumeng Ya Yuan Cheng Hongyun zhao Department of Plastic Surgery The Second Affiliated Hospital of Chongqing Medical UniversityChongqing400010China Department of Neurosurgery The Second Affiliated Hospital of Chongqing Medical UniversityChongqing400010China Department of Gastroenterology The Second Affiliated Hospital of Chongqing Medical UniversityChongqing400010China

A keloid(KD)is a benign dermal fibrotic *** of KDs is challenging and the recurrence rate is high;thus,there is an unmet need to explore new target sites and new treatment *** a tumor-associated cytokine,autocrine motility factor(AMF)can effectively stimulate the random and directional movement of *** first found that AMF was overexpressed in keloid fibroblasts(KFs)and the proliferation and migration of KFs were promoted by AMF *** treatment with Y-27632,RhoA kinase inhibitor,the proliferation and migration capacity of KFs declined significantly,and type I collagen protein,active RhoA and ROCK1 also were *** addition,a KD transplantation model was established under the skin of nude mice,with KD intramural injection AMF siRNA,we found that the weight of the KD was smaller than in the control group(P<0.05),KD tissue sections stained by HE and Masson showed that fibers became loose and the blood vessels were visibly *** conclusion,AMF siRNA is expected to be a novel strategy to treat KD by inhibiting signaling pathway of RhoA/ROCK1.

关键词： Autocrine motility factor Keloid RhoA SIRNA Treatment

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

Research on Electromagnetic Loss Characteristics of Submarine Cables

引用

Energy Engineering 2023年第11期120卷 2651-2666页

作者： Liuhuo Wang Qingcui Liu Wenwei Zhu Yanru Wang yi tian Long zhao Guangdong Power Grid Co. Ltd.Guangzhou510600China Guangzhou Yueneng Power Technology Development Co. Ltd.Guangzhou510000China Grid Planning Research Center of Guangdong Power Grid Co. Ltd.Guangzhou510080China Department of Electronics and Information Xi’an Polytechnic UniversityXi’an710048China

The electromagnetic losses of submarine cables are mainly caused by the metal shielding layer to prevent the water tree effect and the armor layer that strengthens the strength of the submarine *** these losses cause the temperature of submarine cable to rise,and temperature variation will in turn change the conductivity of its metal layer *** this paper,the electric-magnetic-thermal multi-physical field coupling of the electromagnetic loss variation of the submarine cable is realized by establishing a full coupling system containing Fourier’s law and Maxwell-Ampère’s Law for the photoelectric composite submarine *** multi-physical field coupling model is solved and analyzed by using the finite ***,the loss of each layer of the optoelectronic composite submarine cable is analyzed,and the lossof eachlayer of the submarine cable and themainfactors leading to the loss of the submarine cable are ***,the influence of environmental temperature,ampacity and armor layer on the electromagnetic loss of submarine cables is studied,and the main operating factors affecting the electromagnetic loss of submarine cables are *** research shows that the influence of ambient temperature can be ignored,and the loss of shielding layer and armor layer increases with the increase of ampacity,but the impact of shielding layer loss is ***,this paper studies the electromagnetic loss of each metal layer of the submarine cable and the influence of the laying spacing on the electromagnetic *** research results show that the two ways of improving the conductivity of the armor layer and reducing the relative permeability of the armor layer can effectively reduce the loss of each metal layer in the cable structure and increase the current carrying capacity when the tensile strength of the armor layer meets the requirements for single-core and threecore photoelectric composite submarine cables laid *** the s

关键词： Submarine cable multi-physical field coupling electromagnetic loss

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

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：