نتایج جستجو برای: bar metal
تعداد نتایج: 226489 فیلتر نتایج به سال:
روش مرسوم بر اساس تئوری جدار نازک فقط برای تحلیل پیچش میله های همگن با ضخامت کوچک و شعاع گوشه بزرگ جواب قابل قبولی می دهد. از طرفی تا کنون هیچ راه حل تحلیلی برای پیچش مقاطع باز غیر همگن ارائه نشده است. در این پایان نامه، یک روش تقریبی تحلیلی برای پیچش مقاطع باز همگن و غیر همگن با ضخامت ثابت ارائه می شود. برای مدل سازی هندسه مسأله، مقطع بصورت ترکیبی از تعدادی اجزاء مستقیم، انحنادار (کمان دایره)...
The calculations performed in this study indicate that efficient deposition of tetragonal yttria-stabilized zirconia ~YSZ! by chemical vapor deposition ~CVD! is feasible using metal chloride precursors ~Zr-Y-C-O-H-Cl system!. As reported in the literature, this work demonstrates that high oxygen content is necessary to efficiently utilize metal chloride precursors for depositing tetragonal YSZ ...
The replacement of noble metal technologies and the realization of new reactivities with earth-abundant metals is at the heart of sustainable synthesis. Alkene hydrogenations have so far been most effectively performed by noble metal catalysts. This study reports an iron-catalyzed hydrogenation protocol for tri- and tetra-substituted alkenes of unprecedented activity and scope under mild condit...
Electrodeposition experiments of the charge-transfer complex copper tetracyanoquinodimethane (CuTCNQ) (where TCNQ denotes 7,7',8,8'-tetracyanoquinodimethane) on noble metal electrodes (M=Pt and Au) were optimized in order to produce suitable layers for bipolar resistive switching cross-bar M/CuTCNQ/Al memory cells. Corresponding memories exhibited up to more than 10 000 consecutive write/erase ...
PURPOSE The objective of this study was to assess the stress distribution generated by a simulated loading (100 N) in the area of the cantilever in three different five-implant mandibular protocol prosthesis models. MATERIALS AND METHODS The finite element analysis was carried out in three-dimensional models simulating: (1) a temporary all acrylic resin mandibular protocol prosthesis; (2) a m...
Introduction The distribution of highly siderophile elements in planetary materials is controlled mainly by metal. Diffusion processes can control the distribution or re-distribution of these elements within metals, yet there is little systematic or appropriate diffusion data that can be used to interpret HSE concentrations in such metals. Because our understanding of isotope chronometry, redox...
Although titanium nitride (TiN) is among the most extensively studied and thoroughly characterized thin-film ceramic materials, detailed knowledge of relevant dislocation core structures lacking. By high-resolution scanning transmission electron microscopy (STEM) epitaxial single crystal (001)-oriented TiN films, we identify different types their structures. These include, besides expected prim...
Experimental assessment of the hydrogen (H2)-adsorption capacities metal-doped carbon nanostructured materials were investigated in this study. Given their intrinsic characteristics, carbonic show great potential for different applications that require H2, one such being use as carriers automotive sector. The current paper considers two types substrates (carbon nanotubes and polyaniline) functi...
We analyze, with the computer code LS-DYNA, three-dimensional (3D) transient deformations of a 10-layer woven Kevlar armor held in a square steel frame and impacted at normal incidence by a 9 mm FMJ (full metal jacket), 124 grain projectile. The composite armor is discretized into weft and warp yarns to simulate its woven structure. The yarn is modeled as a 3D continuum. We consider failure of ...
Aims. This is the first paper of a series aimed to understand the formation and evolution of bars in early-type spirals and their influence in the evolution of the galaxy. Methods. Optical long-slit spectra along the major axis of the bar of a sample of 20 galaxies are analyzed. velocity and velocity dispersion profiles along the bar are presented. Line-strength indices in the bar region are al...
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