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grouping are important phenomena in their own right:
we quickly and effortlessly perceive boundaries between
certain visual textures, perceive edges between coherent regions
in an image, and quickly detect unusual items that
grouping phenomena are given in Figure 1.
Following the visual system’s “rules” of visual organization
makes interpretation of visual aspects of designs effortless:
a user easily sees which labels refer to which parts of a diaa
b
c
d
e
f
Figure 1: Perceptual grouping examples, including
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by good continuation (c, d). (e) A user interface; what
is the percept? (f) A graph, from [5]. Will a user
perceive the trend of the data?
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CHI 2009 ~ Cognitive Modeling and Assessment April 8th, 2009 ~ Boston, MA, USA
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دانلود مقاله ISI با ترجمه فارسی مروری مختصر بر تحلیل خزش، ثبات ویسکو ...
Calgary, Alberta, Canada T2N IN4
Communicated by Xavier J. R. Avula
(Received March 1984; revised November 1985)
Abstract-The paper presents the creep-stability analysis of viscoelastic cylindrical
shells under axial compression. The mechanical properties of the material are described
integral operators. The approximate analytical solution to the problem is obtained by
means of a modification of the quasi-elastic method. As a result, the instability condition
for the shell is formulated. It is shown that for viscoelastic materials with limited creep,
there is a safe load limit below which the structure is asymptotically stable. Any load
above the safe load limit leads to buckling at the corresponding critical time.
1. INTRODUCTION
Creep stability of circular cylindrical shells has been studied by numerous researchers
using various concepts and constitutive laws. A number of investigations utilize the initial
imperfection approach followed by the conclusion that under creep conditions initial imperfections
develop with time, leading eventually to collapse of the structure. The critical
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rates. Comprehensive reviews of these studies are given by Hoffll, 21 and
Kurshin[3].
In recent years an increasing interest has been attracted by applications of the classical
bifurcation theory to the creep-stability research. In particular, creep stability of cylindrical
shells is treated in many publications[4-81 as an instantaneous process which involves
time-dependent constitutive terms and is characterized as branching into a different
equilibrium configuration. Respectively, the critical time is associated with the instant at
which bifurcation first becomes possible. The results from these studies depend upon the
basic assumptions as to the creep properties of the structure.
The present paper is concerned with the stability analysis of circular cylindrical shells
whose material properties are defined by the constitutive equations of the linear viscoelastic
theory. Using the concept of bifurcation the exact linear eigenvalue problem is
formulated in terms of two destabilizing parameters: the compressive load and time. The
مقاله ISI با ترجمه فارسی ارزیابی تاثیر مدیریت ارتباط با مشری(CRM) برابعاد عملکرد سازکانی مطالعه موردی ...
must nowadays focus on implementing a CRM strategy that aims to seek, gather and
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دانلود مقاله ISI با ترجمه محتوای اطلاعاتی اعلام سود در کشور دانمارک
speed of adjustment can be set forth. Therefore in both cases the question of which
effect is the dominant one becomes an empirical issue.
The information content of EAs in a small stock market has previously been studied
in Kallunki (1996) in the context of the Finnish stock market. However, there are two
suitable candidate for isolating the effect of stock market size on the information
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are very different from the IAS. Secondly, as also noted by Kallunki (1996),