检索结果-南通市图书馆

可装配性研究中基于凸包技术的关键公差识别统计方法（英文）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2015年第5期16卷 361-370页

作者： philipp ZIEGLER Sandro WARTZACK Applied Analysis University Rostock Engineering Design KTmfk FAU Erlangen-Nürnberg

目的:从公差仿真结果中获得依据,以此优化公差值及公差方案,并通过灵敏度分析来验证单个参数的改变对所得仿真结果的影响。创新点:1.根据公差技术,对凸包采取基于方差的全局敏感度分析;2.提出估计单个零件公差对装配间隙影响的方法。方... 详细信息

目的:从公差仿真结果中获得依据,以此优化公差值及公差方案,并通过灵敏度分析来验证单个参数的改变对所得仿真结果的影响。创新点:1.根据公差技术,对凸包采取基于方差的全局敏感度分析;2.提出估计单个零件公差对装配间隙影响的方法。方法:1.采用特征要素公差带凸包表示方法(图1);2.进行基于方差的全局敏感度分析(图2);3.通过灵敏度分析算法分析相对间隙和公差值的关系(图3、4和5);4.以销孔装配为例,验证该方法的可行性(图7、8和9)。结论:1.销孔连接的实验证明了基于凸包技术的全局敏感度分析的必要性;2.基于凸包的灵敏度分析方法可用于分析单个零件公差对装配间隙的影响。

关键词： T-Map 公差域可装配性敏感度分析统计公差分析

Impact of surface phase coexistence on the development of step-free areas on Si（111）

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2015年第2期9卷 141-146页

作者： Andreas FISSEL Ayan Roy CHAUDHURI Jan KRUGENER philipp GRIBISCH H. Jorg OSTEN Institute of Electronic Materials and Devices Leibniz University Hannover Schneiderberg 32 30167 Hannover Germany

The step-flow growth condition of Si on Si（111） near the （7×7）-＂1×1＂ surface phase transition temperature Tc are analyzed within the framework of Burton- Cabrera-Frank theory. In particular, coexistence of both surface phases well below Tc and their specific influence on the step-flow growth behavior are considered. We presume that under dynamical condition of growth, the surface initially covered by only the （7×7） phase separates into domains surrounded by ＂1×1＂ areas. On such a surface, the overall supersaturation should be reduced drastically compared to a surface with only （7×7）, resulting in much larger critical terrace width for nucleation.

关键词： molecular beam epitaxy step-flow growth mode surface superstructure silicon

Dupilumab-associated ulcerative keratitis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2022年第6期15卷 1020-1022页

作者： Matthew M Wilson philipp K Roberts Mark Daniell Corneal Service Royal Victorian Eye and Ear HospitalEast MelbourneVictoria 3002Australia Medical University of Vienna Vienna 1090Austria Department of Surgery(Ophthalmology) University of MelbourneParkvilleVIC 3013Australia Surgical Research Unit Centre for Eye Research Australia(CERA)University of MelbourneMelbourneVIC 3013Australia

Dear Editor,We present a case of a healthy 32-year-old man who developed bilateral corneal ulceration 3 wk after commencing dupilumab for atopic dermatitis. Dupilumab is a recently introduced systemic monoclonal antibody used in the treatment of moderate-to-severe atopic dermatitis, showing efficacy in clinical trials;. Several publications have reported ocular surface complications associated with dupilumab.

关键词： dermatitis clinical keratitis

Teriflunomide provides protective properties after oxygen-glucose-deprivation in hippocampal and cerebellar slice cultures

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第11期16卷 2243-2249页

作者： Anna Wolters Judith Reuther philipp Gude Thomas Weber Carsten Theiss Heike Vogelsang Veronika Matschke Institute of Anatomy Department of CytologyMedical FacultyRuhr University BochumBochumGermany Department of Anaesthesiology and Intensive Care Medicine Ruhr University BochumSt.Josef HospitalBochumGermany

One of the major challenges in emergency medicine is out-of-hospital cardiac arrest(OHCA).Every year,about 53–62/100000 people worldwide suffer an out-of-hospital cardiac arrest with serious consequences,whereas persistent brain injury is a major cause of morbidity and mortality of those surviving a cardiac ***,only few and insufficient strategies are known to limit neurological damage of ischemia and reperfusion *** aim of the present study was to investigate whether teriflunomide,an approved drug for treatment of relapsing-remitting-multiple-sclerosis,exerts a protective effect on brain cells in an in vitro model of ***,organotypic slice cultures from rat hippocampus and cerebellum were exposed to oxygen-glucose-deprivation and subsequently treated with *** administration of teriflunomide in the reperfusion time on both hippocampal and cerebellar slice cultures significantly decreased the amount of detectable propidium iodide signal compared with an untreated culture,indicating that more cells survive after ***,hippocampal slice cultures showed a higher vulnerability to ischemic conditions and a more sensitive response to teriflunomide compared with cerebellar slice *** study suggests that teriflunomide,applied as a post-treatment after an oxygenglucose-deprivation,has a protective effect on hippocampal and cerebellar cells in organotypic slice cultures of *** procedures were conducted under established standards of the German federal state of North Rhine Westphalia,in accordance with the European Communities Council Directive 2010/63/EU on the protection of animals used for scientific purposes.

关键词： brain damage cardiac arrest cell death hypoxic chamber ischemia organotypic slice cultures post-treatment resuscitation

Extraction and Evaluation of Knowledge Entities from Scientific Documents

在线全文

学校读者我要写书评

暂无评论

Journal of Data and Information Science 2021年第3期6卷 1-5页

作者： Chengzhi Zhang philipp Mayr Wei Lu Yi Zhang Nanjing University of Science and Technology China GESIS-Leibniz-Institute for the Social Sciences Germany Wuhan University China University of Technology Sydney(UTS) Australia

As a core resource of scientific knowledge,academic documents have been frequently used by scholars,especially newcomers to a given *** the era of big data,scientific documents such as academic articles,patents,technical reports,and webpages are *** rapid daily growth of scientific documents indicates that a large amount of knowledge is proposed,improved,and used(Zhang et al.,2021).

关键词： knowledge Entities field.

Applying ionic liquids as oil additives for gearboxes:Going beyond the state of the art by bridging the nano-scale and component level

在线全文

学校读者我要写书评

暂无评论

Friction 2023年第6期11卷 1057-1078页

作者： Azhaarudeen ANIFA MOHAMED FARUCK philipp G.GRÜTZMACHER Chia-Jui HSU Dominik DWORSCHAK Hsiu-Wei CHENG Markus VALTINER Kristof STAGEL philipp MIKSOVSKY Apurba Ranjan SAHOO Aitor SAINZ MARTINEZ Katharina BICA-SCHRODER Michael WEIGAND Carsten GACHOT Institut für Konstruktionswissenschaften und Produktentwicklung(IKP) Tribology Research DivisionTU WienVienna1060Austria Institut für Angewandte Physik(IAP) Applied Interface Physics research groupTU WienVienna1040Austria Institut für Angewandte Synthesechemie(IAS) Sustainable Organic Synthesis and Catalysis research groupTU WienVienna1060Austria

Ionic liquids(ILs)have been used effectively in many applications for reducing problems related to friction and *** this work,the potential of ILs as an anti-wear and extreme pressure lubricant additive for high load-carrying gearbox applications such as helicopter transmissions has been *** halide-free ILs:P_(8881)(BuO)_(2)PO_(2)^(-)(1)and P_(8881)(MeO)_(2)PO_(2)^(-)(2),which are blended at 5 wt%each into a standard non-additivated FVA2 base oil(BO)are *** solid-liquid interface,friction and load-carrying capacity,and wear(scuffing)behavior are studied on the nano-,lab-,and component-scale,respectively,at a different range of temperature and loading conditions by using the atomic force microscopy(AFM),Schwing-Reib-Verschleiβ(SRV)friction tests,and Brugger tests,as well as forschungsstelle für zahnrader und getriebebau(FZG)back-to-back gear test *** AFM analysis shows nearly no change of adhesion over the full range of studied temperature for the IL blends compared to the ***,IL blends demonstrate a very stable coefficient of friction(COF)of around 0.16,which even decreases with increasing test temperatures ranging from 40 to 120℃.A clear reduction in COF up to 25%is achieved by adding only 5 wt%of the investigated Ils in the BO,and the Brugger tests also show a pronounced enhancement of load-carrying ***,on the component-scale,a significant improvement in gear scuffing performance has been observed for both used IL blends.A detailed characterization of the wear tracks from the SRV friction tests via the transmission electron microscopy(TEM)revealed the formation of a phosphate(P-O)-based amorphous tribo-chemical layer of about 20 nm ***,this work may present an approach for Ils to be used as an additive in conventional lubricants due to their ability to enhance the lubrication properties,making them an alternative lubricant solution for high load-carrying gearbox applications.

关键词： ionic liquids(ILs) additives gears scuffing friction load-carrying capacity

One-bit quantization is good for programmable coding metasurfaces

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 China(Information Sciences) 2022年第7期65卷 225-239页

作者： Ya SHUANG Hanting ZHAO Menglin WEI Qiang CHENG Shi JIN Tiejun CUI philipp DEL HOUGNE Lianlin LI State Key Laboratory of Advanced Optical Communication Systems and Networks Department of ElectronicsPeking University Institute of Electromagnetic Space Southeast University State Key Laboratory of Millimeter Waves Southeast University Pazhou Laboratory University of Rennes

The information-carrying programmable metasurfaces have found widespread applications in communication, sensing, and other related areas. However, there is a fundamental but unresolved problem,i.e., the rigorous understanding of the quantization of metasurface coding. Here, we theoretically investigate the performance difference between one-bit and continuous information-encoding metasurfaces. To this end,we derive analytical representations of system responses in various cases(single-input single-output, singleinput multiple-output, and multiple-input multiple-output). We analyze the impact of one-bit coding(in contrast to continuous coding) in terms of the resulting channel cross-talk and reduction of information capacity in various representative scenarios from wireless communication and holography. Our main finding indicates that the one-bit coding yields a satisfactory performance in most practical scenarios; we also show that in many cases there are smart ways to mildly relax optimization constraints in order to reduce the performance gap between the one-bit and continuous coding. We expect that our results can provide theoretical guidance for a large variety of metasurface-assisted information systems for electromagnetic waves and other wave phenomena.

关键词： metasurfaces metamaterials information capacity signal representation one-bit coding metasurface

Fully-coupled simulations of thermally-induced cracking in pegmatite due to microwave irradiation

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Rock Mechanics and Geotechnical Engineering 2019年第2期11卷 242-250页

作者： Jielin Li Rennie B.Kaunda Shrey Arora philipp Hartlieb Priscilla P.Nelson School of Resources and Safety Engineering Central South University Department of Mining Engineering Colorado School of Mines Mining Engineering and Mineral Economics Montanuniversitaet Leoben

Fully-coupled thermo-mechanical simulations are implemented in COMSOL Multiphysics to investigate micro-scale stress-strain variability in pegmatite specimens subjected to thermal loading using microwaves. Thermally-induced compressive and tensile stresses increase as the microwave irradiation duration increases. The dielectric constant, coefficient of expansion, and type and size of mineralogical boundary have significant impacts on the responses of the rock to microwave irradiation. The maximum principal stress of the chlorite is the smallest, indicating that the chlorite experiences the most damage under microwave irradiation, followed by the quartz. The maximum principal stress values of plagioclase and orthoclase are larger, indicating that they are likely to incur the least damage. Where quartz or chlorite is dominant, the resulting von Mises stresses are consistently higher after 120 s of microwave irradiation. The rate of generation of von Mises stresses increases most rapidly along the interface between quartz and plagioclase, and the interface between quartz and orthoclase, followed by the interface between quartz and chlorite, and finally the interface between plagioclase and orthoclase. The presented modeling approach provides a practical method to investigate stress-strain relationships within mineralogical boundaries inside a rock thin section.

关键词： Microwave irradiation Thermo-mechanical loading Pegmatite Numerical modeling

Model based decision support system for land use changes and socio-economic assessments

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2018年第2期10卷 169-182页

作者： YU Yang CHEN Xi philipp HUTTNER Marie HINNENTHAL Andreas BRIEDEN SUN Lingxiao Markus DISSE Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Chair of Hydrology and River Basin Management Technical University of Munich Chair of Statistics and Risk Management Universitaet der Bundeswehr Muenchen

Hydrological models are often linked with other models in cognate sciences to understand the interactions among climate, earth, water, ecosystem, and human society. This paper presents the development and implementation of a decision support system（DSS） that links the outputs of hydrological models with real-time decision making on social-economic assessments and land use management. Discharge and glacier geometry changes were simulated with hydrological model, water availability in semiarid environments. Irrigation and ecological water were simulated by a new commercial software MIKE HYDRO. Groundwater was simulated by MODFLOW. All the outputs of theses hydrological models were taken as inputs into the DSS in three types of links： regression equations, stationary data inputs, or dynamic data inputs as the models running parallel in the simulation periods. The DSS integrates the hydrological data, geographic data, social and economic statistical data, and establishes the relationships with equations, conditional statements and fuzzy logics. The programming is realized in C＋＋. The DSS has four remarkable features：（1） editable land use maps to assist decision-making;（2） conjunctive use of surface and groundwater resources;（3） interactions among water, earth, ecosystem, and humans; and（4） links with hydrological models. The overall goal of the DSS is to combine the outputs of scientific models, knowledge of experts, and perspectives of stakeholders, into a computer-based system, which allows sustainability impact assessment within regional planning; and to understand ecosystem services and integrate them into land and water management.

关键词： decision support system hydrological modeling ecosystem services land management socio-economic indicator Tarim River Basin