نتایج جستجو برای: space air condition

تعداد نتایج: 980240  

2014
Yong Sun Yuming

To study the performance of nozzle air supply in a large space building, this paper builds a simplified computational model of a large exhibition hall applied with vertical nozzle air supply system using the method of computational fluid dynamics (CFD). The Fluent software is used to realize the three-dimensional simulation and obtain the temperature field and velocity field in the occupied zon...

ترابی, سمیه, سلطانیان, محمد, مهاجری, پرویز, نجفی, فرید,

Background and purpose: Air pollution, especially in treatment centers is associated with several types of pathogenic microorganisms. In dental environment, dentists and patients are exposed to a great variety of infectious agents dispersed by aerosols and droplets produced during operative dentistry procedures. The aim of this study was to determine the density of airborne bacterial species in...

2012
Xiaofeng Shao

Abstract 1: CMAQ is a numerical air quality model which gives concentration of various air pollutants at several different scales. Our main interest is to model the conditional distribution of high resolution output (96 by 96 in space,576 hours) given low resolution output (24 by 24 in space, 576 hours). By a Haar Wavelet Packet Transform of high resolution output for each hour, we naturally li...

In a 10-ton capacity pilot plant solar liquid desiccant air conditioner (LDAC) developed, dehumidification of the outside air is achieved through a honeycomb packed-bed heat and mass exchanger, using lithium chloride solution as the desiccant. The dry air obtained from the dehumidification process is evaporative cooled inside a cooling pad and directed into the conditioned space. The dilute sol...

پایان نامه :دانشگاه تربیت معلم - سبزوار - دانشکده ادبیات و زبانهای خارجی 1390

this study investigated the effects of planning on second-language written production with regard to task type. the participants were 75 iranian learners of english as a foreign language attending a private foreign language institution. they were asked to complete two different types of writing tasks (expository writing task and argumentative writing task) in different planned conditions (indiv...

2009
Pawel Dabkowski Krzysztof Gal

This paper develops new results on the stability and control of a class of linear repetitive processes described by a second-order matrix discrete or differential equation. These are developed by transformation of the secondorder dynamics to those of an equivalent first-order descriptor state-space model, thus avoiding the need to invert a possibly ill-conditioned leading coefficient matrix in ...

2007
EVGENIA SUZDALEVA

The paper deals with a selection of the initial state for Kalman filtering. The prior knowledge about it can be highly uncertain. In practice the initial state mean and covariance are often chosen arbitrarily. The present paper considers the problem from the position of knowledge elicitation and proposes a methodology to extract the prior knowledge from available information by the respective p...

2010
Mahmoud M. El-borai

This note is devoted to study an inverse Cauchy problem in a Hilbert space H for fractional abstract differential equations of the form; ), ( ) ( ) ( = ) ( t g t f t u A dt t u d    with the initial condition H u u = (0) 0 and the overdetermination condition: ), ( = ) ), ( ( t w v t u where (.,.) is the inner product in H , f is a real unknown function w is a given real function, 0 u , v ar...

Journal: :Numerische Mathematik 2016
Martin Halla Thorsten Hohage Lothar Nannen Joachim Schöberl

We consider time harmonic wave equations in cylindrical wave-guides with physical solutions forwhich the signs of group andphasevelocities differ. Theperfectly matched layer methods select modes with positive phase velocity, and hence they yield stable, but unphysical solutions for such problems. We derive an infinite element method for a physically correct discretization of such wave-guide pro...

2012
Mahmoud M. El-borai Hoda A. Foad

In this paper we concerned with study an inverse problem in a Hilbert space H for fractional abstract differential equation of the form du(t) dtα = Au(t) + γ(t)u(t), (1) with the initial condition u(0) = u0 ∈ H (2) and the overdetermination condition (u(t), v) = w(t) (3) where (.,.) is the inner product in H, γ is a real an unknown function,w is a given real function, u0 and v are given element...

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