نتایج جستجو برای: array of cylinders

تعداد نتایج: 21174614  

آریانیان, ایمان, عبدی پور, عبدالعلی, مرادی, غلامرضا,

In this paper, the role of radiation elements in the performance of reflect array antenna is studied, and each element is designed and simulated and the phase response is compared. Also, the relations needed for designing reflect array antenna are discussed and one sample reflect array antenna is designed in the KU band and the results are presented.

Journal: :The European physical journal. E, Soft matter 2003
T R Weikl

Biological and biomimetic membranes often contain aggregates of embedded or adsorbed macromolecules. In this paper, the indirect interactions of cylindrical objects adhering to a planar membrane are considered theoretically. The adhesion of the cylinders causes a local perturbation of the equilibrium membrane shape, which leads to membrane-mediated interactions. For a planar membrane under late...

Journal: :journal of petroleum science and technology 2014
maryam jouyandeh mehdi moayed mohseni fariborz rashidi

a theoretical solution is presented for the forced convection heat transfer of a viscoelastic fluid obeying the giesekus constitutive equation in a concentric annulus under steady state, laminar, and purely tangential flow. a relative rotational motion exists between the inner and the outer cylinders, which induces the flow. a constant temperature was set in both cylinders, in this study. the f...

A. Nazari, A. Nezami

Given four complex matrices $A$‎, ‎$B$‎, ‎$C$ and $D$ where $Ainmathbb{C}^{ntimes n}$‎ ‎and $Dinmathbb{C}^{mtimes m}$ and let the matrix $left(begin{array}{cc}‎ A & B ‎ C & D‎ end{array} right)$ be a normal matrix and‎ assume that $lambda$ is a given complex number‎ ‎that is not eigenvalue of matrix $A$‎. ‎We present a method to calculate the distance norm (with respect to 2-norm) from $D$‎ to ...

Journal: :Journal of Non-newtonian Fluid Mechanics 2022

We study the flow around a periodic array of cylinders using mesoscopic viscoelastic fluid that mimics polymeric solutions. model our employing novel method based on Smoothed Dissipative Particle Dynamics and FENE springs. characterize static dynamic properties solutions compare results with theoretical predictions Zimm model. After rheological characterization modeled solutions, we simulate co...

In this paper two linear arrays including a linear 1×4 and a planar 2×2 of microstrip patch and half-mode substrate integrated waveguide (SIW) cavity hybrid antenna are introduced and investigated. These are simply implemented using low cost single layer printed circuit board (PCB) process. The array element consists of a rectangular microstrip patch with appropriate dimensions in the vicinity ...

We generalize the notion of Jacobson graphs into $n$-array columns called $n$-array Jacobson graphs and determine their connectivities and diameters. Also, we will study forbidden structures of these graphs and determine when an $n$-array Jacobson graph is planar, outer planar, projective, perfect or domination perfect.

Journal: :Journal of Fluid Mechanics 2022

Extensions of Rayleigh–Bloch waves above the cutoff frequency are studied via discrete spectrum a transfer operator for channel containing single cylinder with quasi-periodic side-wall conditions. Above cutoff, wavenumber becomes complex valued and an additional appears. For small- to intermediate-radius values, extended shown connect Neumann Dirichlet trapped modes before embedding in continuo...

Journal: :رادار 0
امیر اکبری ایاز قربانی

detection of stealth targets calls for employment of high-power radars which itself relies on usage of high-gain antennas like large parabolic reflectors. in the past few years, using of an array with many small reflectors instead of a large reflector antenna has been considered. this method provides enhanced eirp by a factor of n2 where n is the number of array antennas. regarding improvement ...

2009
David L. MacNair Jun Ueda

This paper presents a method of modeling and subsequently characterizing stochastically controlled actuator arrays. The actuator arrays are built from cells, each containing six piezoelectric actuators and an amplification structure; however the results can be generalized to actuator arrays using solenoids, pneumatic cylinders, or any other fast acting linear actuators. The cells are controlled...

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