نتایج جستجو برای: cylindrical punches

تعداد نتایج: 25696  

Journal: :American journal of epidemiology 2013
Juan Yang Michelle Pearl Peyton Jacob Gerald N DeLorenze Neal L Benowitz Lisa Yu Christopher Havel Martin Kharrazi

The precise quantitation of smoking during pregnancy is difficult in retrospective studies. Routinely collected blood specimens from newborns, stored as dried blood spots, may provide a low-cost method to objectively measure maternal smoking close to the time of delivery. This article compares cotinine levels in dried blood spots to those in umbilical cord blood to assess cotinine in dried bloo...

Journal: :journal of computational and applied research in mechanial engineering - jcarme 0
m. talebitooti department of mechanical engineering, qom university of technology, qom, 1519-37195, iran m. ghasemi department of mechanical engineering, qom university of technology, qom, 1519-37195, iran s. m. hosseini department of mechanical engineering, qom university of technology, qom, 1519-37195, iran

in the present work, study of the vibration of a functionally graded (fg) cylindrical shell made up of stainless steel, zirconia, and nickel is presented. free vibration analysis is presented for fg cylindrical shells with simply supported-simply supported and clamped–clamped boundary condition based on temperature independent material properties. the equations of motion are derived by hamilton...

2017
Jiangkun Sun Yulie Wu Xiang Xi Yongmeng Zhang Xuezhong Wu

The cylindrical resonator gyroscope (CRG) is a typical Coriolis vibratory gyroscope whose performance is mostly influenced by the damping characteristic of the cylindrical resonator. However, the tremendous damping influences caused by pasting piezoelectric electrodes on the gyroscope, which degrades the performance to a large extent, have rarely been studied. In this paper, the dynamical model...

Journal: :journal of nanostructures 2012
a. ghorbanpour arani s. shams s. amir z. khoddami maraghi

using  principle  of  minimum  total  potential  energy  approach  in conjunction  with  rayleigh-ritz  method,  the  electro-thermo-mechanical  axial  buckling  behavior  of  piezoelectric  polymeric cylindrical  shell  reinforced  with  double-walled  boron-nitride nanotube  (dwbnnt)  is  investigated. coupling  between  electrical and mechanical  fields  are  considered  according  to  a  re...

Journal: :International journal of automotive science and technology 2022

In this study, the effects of punch edge radius and blanking clearance on product quality process in AISI 304 stainless steel sheet were investigated by using fi-nite element analysis method. The analyzes performed at four different tip radii (0.01, 0.25, 0.5, 1 mm) three (1 %, 5%, 10%). As a result analysis, rollover, burr length increased, smooth sheared / fractured surface ratio force decrea...

Journal: :Notae Numismaticae 2023

The paper sheds light on the countermarked imitations of silver coins Jochid Khan Said-Ahmad II (1433–1452). authors identified 38 punches that were used for countermarking, allowing us to say with confidence size this issue was quite large. dangs have not previously been examined in numismatic literature. This is due rarity these coins, which known only from occasional, single finds. Such coun...

F. Karimi Mehran seyedRazzaghi

Thin walled cylindrical shells are important components of industrial structures such as liquid storage tanks, silos, etc. Shell buckling is usually a major failure mode of thin walled shells under extreme loads such as earthquakes. Longitudinal and radial stiffeners are generally used in order to increase buckling capacity of thin walled shells. During an earthquake, cylindrical shells may exp...

2009
A. J. TODD

In [19], we proved that, under certain hypotheses, the moduli space of an asymptotically cylindrical special Lagrangian submanifold with fixed boundary of an asymptotically cylindrical Calabi-Yau 3-fold is a smooth manifold. Here we prove the analogous result for an asymptotically cylindrical special Lagrangian submanifold with moving boundary.

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