检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

节理粗糙度研究的新进展

地质科学译丛 1996年第2期13卷 70-78页

作者： j.p.seidel C.M.Haberfield 杨翠珠 Department of Civil Engineering Monash UniversityClaytonAustralia

当前采用的节理模型,如果不凭借经验,是不可能准确预测节理的剪切行为的,这已成为争论的热点。这是因为这些模型不能定量地评价节理粗糙度或尺度的重要性。介绍一种新的方法,它用分形几何来调查节理的粗糙度。这种方法已超出了简单地描... 详细信息

当前采用的节理模型,如果不凭借经验,是不可能准确预测节理的剪切行为的,这已成为争论的热点。这是因为这些模型不能定量地评价节理粗糙度或尺度的重要性。介绍一种新的方法,它用分形几何来调查节理的粗糙度。这种方法已超出了简单地描述粗糙度的“症状”,而是去寻找“原因”。在该法的应用中,引入了分形几何、分维数和自相似的概念,并系统地阐述岩体节理粗糙度的统计依据和实用模型的框架。推导了分维数和起伏角与粗糙高度的标准差这两个更有用统计参数之间的重要关系。这些关系不仅为定量评价节理粗糙度提供了有用的方法,而且为解释巴顿(Barton)的经验模型(jRC-jCS)提供了基础。另外,分形模型可以为节理剪切行为的正应力作用效应和节理尺度效应提供理论模型。

关键词：节理粗糙度系数分维数自相似岩石

A Comprehensive FIB Lift-out Sample preparation Method for Scanning probe Microscopy

在线全文

学校读者我要写书评

暂无评论

Nanomanufacturing and Metrology 2022年第1期5卷 67-79页

作者： F.ji Y.Yao T.Xin j.seidel School of Materials Science and Engineering UNSW SydneySydneyNSW 2052Australia ARC Centre of Excellence in Future Low-Energy Electronics Technologies(FLEET) UNSW SydneySydneyNSW 2052Australia Electron Microscopy Unit(EMU) Mark Wainwright Analytical CentreUNSW SydneySydneyNSW 2052Australia

In this work,we investigate cross-sectional sample preparation for atomic force microscopy and general scanning probe microscopy(SpM)*** light of traditional cross-sectional sample preparation solutions for transmission electron microscopy,mechanical polishing and focused ion beam(FIB)milling have been employed to prepare cross-sectional samples for *** present an optimized solution for thin films and oxide heterostructures that allows for examining the prepared surfaces using various SpM *** particular,post-cleaning after FIB milling is shown to be crucial and precision ion polishing was conducted to remove rough layers on mechanically polished *** also study SpM mechanical milling to remove amorphous layers on FIB-milled ***,a reliable solution for making cross sections suitable for SpM has been achieved providing a useful methodology that can also be employed for other material systems with different hardness,such as polymers and metals.

关键词： Oxide heterostructures Cross-sectional measurements Scanning probe microscopy AFM FIB

Symmetry protected topological Luttinger liquids and the phase transition between them

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2018年第12期63卷 753-758页

作者： Hong-Chen jiang Zi-Xiang Li Alexander seidel Dung-Hai Lee Stanford Institute for Materials and Energy Science SLAC and Stanford UniversityMenlo ParkCA 94025USA Department of physics University of CaliforniaBerkeleyCA 94720USA Department of physics Washington University.St.LouisMO 63130USA Materials Sciences Division.Lawrence Berkeley National Laboratory BerkeleyCA 94720USA

We show that a doped spin-1/2 ladder with antiferromagnetic intra-chain and ferromagnetic inter-chain coupling is a symmetry protected topologically non-trivial Luttinger *** on a large easy-plane spin anisotropy drives the system to a topologically-trivial Luttinger *** phases have full spin gaps and exhibit power-law superconducting pair *** Cooper pair symmetry is singlet dxy in the non-trivial phase and triplet Sz? 0 in the trivial *** topologically non-trivial Luttinger liquid exhibits gapless spin excitations in the presence of a boundary,and it has no non-interacting or mean-field theory analog even when the fluctuating phase in the charge sector is *** a function of the strength of spin anisotropy there is a topological phase transition upon which the spin gap *** speculate these Luttinger liquids are relevant to the superconductivity in metalized integer spin ladders or chains.

关键词： Topological Luttinger liquids Symmetry protected topological phase phase transition Superconductivity Density-matrix renormalization group

Resilience in supply systems -What the food industry can learn from energy sector

在线全文

学校读者我要写书评

暂无评论

journal of Safety Science and Resilience 2022年第1期3卷 39-47页

作者： Fabian Ossevorth paul seidel Sebastian Krahmer joachim Seifert peter Schegner peter Lochmann Lukas Oehm Marc Mauermann Technische Universität Dresden Professur für ElektroenergieversorgungDresden 01069Germany Technische Universität Dresden Professur für Gebäudeenergietechnik und WärmeversorgungDresden 01069Germany Technische Universität Dresden Professur für Verarbeitungsmaschinen/VerarbeitungstechnikDresden 01069Germany Fraunhofer-Institut for process Engineering and packaging IVV Division Processing Technology Dresden01069Germany

Drastic events such as pandemics,earthquakes or other disasters not only threaten the immediate living conditions of people but also indirect circumstances such as energy supply,infrastructure and food *** ensure that damage and failures in these areas do not lead to a disaster,special requirements are placed on this critical *** this context resilience,which is defined as the resistance of a system to external effects,is required.A field that is indeed part of the critical infrastructure,but which has not been considered as intensively as the energy sector,is food *** investigation focuses on how fundamental principles of thermodynamics,system theory and reliability theory can be applied to the modelling of food production processes to obtain a measure of *** known state and process variables from thermodynamics and electrical power engineering,analogous variables are derived for the food *** variables serve as an evaluation standard for a quality measure𝑄.In addi-tion to system-theoretical considerations,it is investigated how existing evaluation criteria of power engineering,such as System Average Interruption Duration Index(SAIDI)and Customer Average Interruption Duration Index(CAIDI),can be transferred to food ***:The investigation focuses on how fundamental principles of thermodynamics,system theory and reliability theory can be applied to the modelling of food production processes to obtain a measure of *** known state and process variables from thermodynamics and electrical power engineering,analogous variables are derived for the food ***:Drastic events such as pandemics,earthquakes or other disasters not only threaten the immediate living conditions of people but also indirect circumstances such as energy supply,infrastructure and food *** ensure that damage and failures in these areas do not lead to a disaster,special requirements are placed on t

关键词： Resilience Food industry Energy Sector System Theory

教育洞见和新观念的探寻——哈佛教育研究生院“轮会”中的反思性探究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

教育学术月刊 2016年第5期 3-13页

作者： Steve seidel 杨艳美国哈佛大学教育研究生院美国哈佛大学研究生院

尽管学校机构中常常存在诸多挑战,近几十年来,关于如何支持教师成为反思性实践者的努力构成了教育领域改革进展的一个显著特征。个体的教师跨出学校的围墙,在工作日之外创造了一些讨论实践中重要话题的有结构的、分析性的对话机会。从1... 详细信息

尽管学校机构中常常存在诸多挑战,近几十年来,关于如何支持教师成为反思性实践者的努力构成了教育领域改革进展的一个显著特征。个体的教师跨出学校的围墙,在工作日之外创造了一些讨论实践中重要话题的有结构的、分析性的对话机会。从1995年起,一群教育实践者自发地在每月第一个周六会聚在哈佛教育研究生院。这种基于医学"轮会"的聚会模式,为参与者提供了一个进行反思探究的不寻常的空间。本文作者——"轮会"的创建者和协调者,为我们呈现了这项实践活动及其演变的简短历史,探讨了所运用的合作探究机制,提供了用以查看学生作品、讨论复杂而即时的教育话题的流程。

关键词：教育轮会反思性实践教师专业发展

Tumor–stromal cross-talk modulating the therapeutic response in pancreatic cancer

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & pancreatic Diseases International 2018年第5期17卷 461-472页

作者： Christopher C.M.Neumann Ellen von Horschelmann Anja Reutzel-Selke Elisabeth seidel Igor Maximilian Sauer johann pratschke Marcus Bahra Rosa Bianca Schmuck Department of Surgery Campus Charité Mitte Campus Virchow-KlinikumExperimental SurgeryCharité-Universitatsmedizin BerlinBerlinGermany Berlin Institute of Health Department of SurgeryCampus CharitéMitte and Campus Virchow-KlinikumAugustenburger Platz 113353 BerlinGermany

Background: pancreatic ductal adenocarcinoma(pDAC) is a highly malignant solid tumor with a dismal prognosis. The stroma component makes up to 90% of the tumor mass and is thought to be one of the main reasons for the tumor’s high chemoresistance. Cancer associated fibroblasts(CAFs) have previously been identified to be the key stromal players. This is the first time we provide detailed in vitro experiments investigating tumor–stromal interactions when exposed to three well-known chemotherapeutic agents. Methods: Monocultures, indirect and direct co-cultures of two pDAC cell lines(AspC and panc-1) and six primary patients derived CAFs were treated with gemcitabine, nab-paclitaxel and the γ-secretaseinhibitor(GSI) DApT. The cell viability of each component was measured with XTT. Finally, IL-6 concentrations of the supernatants were analyzed. Results: On the contrary to pDAC cell lines, CAF monocultures hardly responded to any treatment which suggested that stroma(CAFs) itself is more resistant to standard chemo-treatments than the epithelial cancer cells. Moreover, only a weak chemotherapeutic response was observed in direct co-cultures of cancer cells with CAFs. A change in the morphology of direct co-cultures was accompanied with the chemoresistance. CAFs were observed to build cage-like structures around agglomerates of tumor cells. High levels of IL-6 were also associated with a reduced response to therapy. Indirect co-cultures make the tumor–stromal interaction more complex. Conclusions: CAFs are highly chemoresistant. Direct cell–cell contact and high levels of IL-6 correlate with a high chemoresistance.

关键词： pancreatic cancer Tumor microenvironment Cancer associated fibroblasts Cancer–stroma co-culture Atroma targeted therapy

Kaede for Detection of protein Oligomerization

在线全文

学校读者我要写书评

暂无评论

Molecular plant 2013年第5期6卷 1453-1462页

作者： Heike Wolf B. George Barisas KarI-josef Dietz Thorsten seidel Dynamic Cell Imaging Faculty of Biology Bielefeld University D-33501 Bielefeld Germany Department of Chemistry Colorado State University Fort Collins CO 80523 usa Biochemistry and physiology of plants Faculty of Biology Bielefeld University D-33501 Bielefeld Germany

photoconvertible fluorescent proteins such as Kaede are routinely used for tracking proteins, organelles, and whole cells. Kaede was the first identified photoconvertible fluorescent protein and has since become the most commonly used photoconvertible fluorescent protein in vertebrates. Kaede can be irreversibly converted from a green to a red fluo- rescent form upon UV/blue light irradiation and fluorescence of each form can be isolated separately by appropriate filter sets. Spectral properties of the Kaede forms allow F6rster resonance energy transfer （FRET） from the green form as donor to the red form as acceptor. As a sample containing oligomerized Kaede-containing proteins is exposed to UV or blue light, FRET first increases as green Kaede is converted to red and then decreases as the green donor becomes depleted. Thus, FRET information is potentially obtained from a number of independent measurements taken as photoconversion proceeds. We demonstrate here the application of this approach to detect homo-aggregation and conformational dynamics of plant pro- tein constructs. Structural alterations of 2-cys peroxiredoxin-Kaede were successfully detected depending on the redox state in living plant cells. photoconversion was performed gradually and donor emission, acceptor emission, and FRET-derived sensitized acceptor emission were measured at each step of conversion. Since photoconvertible proteins have not been rou- tinely used in plants, two plasmids have been designed to facilitate plant applications. The plasmids allow either transient expression of Kaede-containing protein constructs in plant cells or Gateway cloning and stable transformation of plants.

关键词： protein structure fluorescence imaging protein-protein interaction.

Message from the Editors-in-Chief

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Visual Informatics 2017年第1期1卷 80-80页

作者： Hans-peter seidel Kun Zhou 不详

It is our great pleasure to announce the launch of a new journal,Visual Informatics,which will publish original articles and survey papers on theories and algorithms for visual information modeling,synthesis and *** information is the major channel for human and ma-chines to perceive the surrounding world,whereas images,videos,graphics and animations are the most popular visual ***-sides real-time generation and transmission of visual information,efficient acquisition and perception of the features and semantics behind visual information have long been the grand challenges of multiple areas in computer science.

关键词： Visual graphics visual

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

连续式pTT工艺

合成纤维 2005年第2期34卷 41-44页

作者： S.Deiss E.seidel 德国吉玛公司

简要介绍了聚对苯二甲酸丙二酯(pTT)的应用、市场和工艺发展。重点分析了间歇式和连续式聚合物工艺的不同及对产品质量的影响。详细介绍了吉玛公司pTT民用长丝的纺丝工艺——冷态工艺加上改性剂。

关键词： pTT 纺丝工艺聚对苯二甲酸丙二酯长丝改性剂吉玛公司间歇式重点分析市场产品质量