نتایج جستجو برای: square section rod
تعداد نتایج: 305266 فیلتر نتایج به سال:
We have studied (001) surface terminated cerium oxide nanoparticles grown on a ruthenium substrate using physical vapor deposition. Their morphology, shape, crystal structure, and chemical state are determined by low-energy electron microscopy and micro-diffraction, scanning probe microscopy, and synchrotron-based X-ray absorption spectroscopy. Square islands are identified as CeO2 nanocrystals...
An adaptive fuzzy sliding mode controller (AFSMC) is adopted to reduce the 2D flow-induced vibration of an elastically supported square-section cylinder, free to oscillate in stream-wise andtransverse directions in both lock-in and galloping regions. The AFSMC strategy consists of a fuzzy logic inference system intended to follow a sliding-mode controller (SMC), and a robust control syste...
Background and Objectives: This study focused on lifting drill rods. Drilling is a repetitive and heavy mining operation with a high incidence and severity of musculoskeletal injuries. The purpose of this study was to examine how to lift a vertical drill bit (1.61m and 35kg in height) using two types of rod height and four feet positions, and finally compare them with the Lifting Index (LI). M...
the caspian sea contains great resources of oil and gas. the caspian sea is a 700- mile- long body of water in central asia, land located between azerbaijan, iran, kazakhstan, russia and turkmenistan. iran was challenges and opportunities in the caspian region. key question in this thesis includes three section that first question, opportunities of iran in the caspian region, second question ch...
The oil film generation of a U-cup rod seal and the thickness on after outstroke were analyzed analytically, numerically, experimentally. sealing system consists an unmodified, commercially available U-cup, polished rod, mineral oil. inverse theory hydrodynamic lubrication (IHL) elastohydrodynamic (EHL) model—both based Reynolds equation for thin lubricating films—were utilized to simulate gene...
We derive a scaling relationship for the mean square rotation rate of rods with lengths in the inertial range in turbulence: ∝ l(-4/3). We present experimental measurements of the rotational statistics of neutrally buoyant rods with lengths 2.8<l/η<72.9, and find that the measurements approach the predicted scaling. The approach to inertial range scaling is shown to be more complex t...
(i) Solve for u (x, y, t) subject to an initial condition u (x, y, 0) = 100. (ii) Find the smallest eigenvalue λ and the first term approximation (i.e. the term with e−λκt). (iii) For fixed t = t0 ≫ 0, sketch the level curves u = constant as solid lines and the heat flow lines as dotted lines, in the xy-plane. (iv) Of all rectangular plates of equal area, which will cool the slowest? Hint: for ...
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