نتایج جستجو برای: slenderness (h/d)

تعداد نتایج: 20131  

1999
T. Wilkinson

Steel beam cross sections are normally classified according to the effect of local buckling on the moment capacity of the section. This is achieved by defining slenderness limits for the flange and the web. This paper describes a series of bending tests on cold-formed RHS to examine these limits. The resulting experimental relationship between web slenderness and plastic rotation capacity is gi...

2012
X. Zeng B. Xu

In this study, experimental study on six RC columns with different slenderness ratios under axial rapid loading was conducted to investigate the axial compression behaviour of RC columns considering the effect of strain rates. The failure pattern of the specimens and the relations of axial loading versus the axial deformation were described. From the test results, the specimens under static and...

2004
R. K. Ranjan S. Kumar

The paper reports an investigation into the forging of solid powder circular disc with large slenderness ratio, between two flat dies. The deformation pattern during the operation is influenced by many factors, which interact with each other in a complex manner. The decisive factors are the interfacial conditions, initial relative density of the preform and the geometry of the preform. An attem...

Journal: :Annals of botany 2006
Michael S Watt John R Moore Jean-Philippe Façon Geoff M Downes Peter W Clinton Graham Coker Murray R Davis Robyn Simcock Roger L Parfitt John Dando Euan G Mason Horacio E Bown

BACKGROUND AND AIMS Although density-specific stiffness, E/rho, (where E is Young's modulus and rho is wood density) is often assumed constant by the elastic similarity model, and in determination of critical buckling height (H(crit)), few studies have tested this assumption within species. Here this assumption is tested for Pinus radiata growing across an environmental gradient, and theory is ...

Journal: :Bulletin of the New Zealand Society for Earthquake Engineering 1977

2013
Mihaela NIŢĂ Dieter SCHOLZ Mihaela Nită Dieter Scholz

This paper conducts an investigation towards main aircraft cabin parameters. The aim is two-fold: First, a handbook method is used to preliminary design the aircraft cabin. Second, an objective function representing the “drag in the responsibility of the cabin” is created and optimized using both an analytical approach and a stochastic approach. Several methods for estimating wetted area and ma...

Journal: :The Journal of experimental biology 2009
Jordan D Charles Adrian Bejan

In the present study, we show that the fastest runners and swimmers are becoming not only faster but also heavier, taller and more slender. During the past century, the world record speeds for 100 m-freestyle and 100 m-dash have increased with body mass (M) raised to the power 1/6, in accordance with the constructal scaling of animal locomotion. The world records also show that the speeds have ...

ژورنال: پژوهش در پزشکی 2011
جعفری, مهوش, صابری, مهدی, صدرایی, سید همایون, پندونه, علی, کاکا, غلامرضا, اسدی, محمد حسین,

Abstract Background: Inhalation of Sulfur mustard (HD) will cause lung epithelial inflammation and injury. There are different results from the prophylactic effects of amifostine (AM) on protection of lung epithelial tissue against HD. The aim of this study was to evaluate the prophylactic effects of AM on protection of rat lung tissue exposed to HD. Methods: In this study twenty Albino Wis...

Journal: :بینا 0
محمدرسول صبوری mr sabouri دانشگاه علوم پزشکی گیلان- گیلان- ایران احسان کاظم نژاد e kazemnejad دانشگاه علوم پزشکی گیلان- گیلان- ایران وحیده حافظی v hafezi دانشگاه علوم پزشکی گیلان- گیلان- ایران

purpose: to measure macular thickness in normal subjects with respect to age and gender using cirrus hd-oct in rasht city. methods: in this cross-sectional study, 112 normal subjects were randomly selected. both eyes of each subject were included and all subjects underwent complete eye examinations. macular thickness map protocol with macular cube 512×128 was selected, and the average thickness...

Journal: :journal of rehabilitation in civil engineering 2014
gholamreza abdollahzadeh heidar farzi-bashir mohammadreza banihashemi

the present study assesses the seismic performance of steel moment resisting frames (smfs) retrofitted with different bracing systems. two structural configurations were utilized: ordinary concentrically braces (ocbfs), buckling-restrained braces (brbfs). a 7-story and 18-story steel perimeter smfs were designed with insufficient lateral stiffness to satisfy code drift limitations in high seism...

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