نتایج جستجو برای: length to diameter ratio

تعداد نتایج: 10712282  

Journal: :Journal of physics 2023

Abstract The overload signal of fuze is prone to be adhesion while projectile penetrating multi-layer target with high speed. This problem would cause failure judgment the layers. ahhesion phenomenon related many factors, such as penetration speed, parameters projectile, characteris and so on. In this paper, influence speed length-diameter ratio on overlaod analyzed by numerical simulation. Fir...

Journal: :journal of sciences, islamic republic of iran 2014
a. jamshidi

uniaxial compressive strength (ucs) and elastic properties of rocks play a major and vital role for the design of any engineering structure. the specimen diameter size is one of the main factors that influencing on ucs, elasticity modulus and poisson’s ratio (e and υ). here, an attempt has been made to investigate the effect of specimen diameter size on ucs, e and υ. moreover, we studied the co...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1387

boron nitride semiconducting zigzag swcnt, $b_{cb}$$n_{cn}$$c_{1-cb-cn}$, as a potential candidate for making nanoelectronic devices was examined. in contrast to the previous dft calculations, wherein just one boron and nitrogen doping configuration have been considered, here for the average over all possible configurations, density of states (dos) was calculated in terms of boron and nitrogen ...

Journal: :Thorax 1987
K Horsfield W I Gordon W Kemp S Phillips

Bronchial tree casts were made from one or both lungs from nine children aged from five weeks to 17 years. The branches of the casts were ordered by the method of Strahler, and diameter ratio, length ratio, and branching ratio were determined. From five to 12 weeks the diameter ratio is about 1.35, but by 13 months it has risen to 1.45, indicating a faster rate of growth in the larger airways o...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان - دانشکده برق و کامپیوتر 1392

abstract nowadaysphotovoltaic solar cells (pvs) areacknowledged the fastest growing energy technology in the word, however, they only account for only fraction of current global renewable energy capacity. it isrecognized that this incomplete market penetration has been largely a result of the technology’sexcessive cost. so researchers are trying to find innovative, economic way with theaim of ...

Journal: :تحقیقات آب و خاک ایران 0
محبوبه سادات ملائی دانشجوی سابق کارشناسی ارشد علی مهدوی مزده استادیار گروه مهندسی آب دانشگاه بین المللی امام خمینی (ره) علیرضا وطن خواه استادیار گروه مهندسی آبیاری و آبادانی دانشگاه تهران

in this study, hydraulic properties of low pressure drip irrigation systems were studied under laboratory conditions and using of the pipes that exist in iran. therefore, effect of various heads from 0.45 to 1.8m was evaluated for lateral pipe with outside diameter 32mm and length of 16, 30, 60 and also the lateral pipe with length 16 and outside diameter of 16, 20, 25 and 32mm, on hydraulic ch...

Journal: :CoRR 2012
Jiabing Wang Jiaye Chen

Given a weighted and complete graph G = (V, E), V denotes the set of n objects to be clustered, and the weight d(u, v) associated with an edge (u, v) ∈ E denotes the dissimilarity between objects u and v. The diameter of a cluster is the maximum dissimilarity between pairs of objects in the cluster, and the split of a cluster is the minimum dissimilarity between objects within the cluster and o...

ژورنال: :مکانیک سازه ها و شاره ها 2013
محسن به نیا مهدی نیلی احمدآبادی

the purpose of this study is to design a three-stage axial compressor with identical pressure ratio which makes an adequate pressure ratio and efficiency in design point conditions with rotational velocity of 38000rpm and mass flow rate of 3.2kg/s. first of all, considering some restrictions such as dehaller number more than 0.7 in all sections of the stator and the rotor, and relative mach num...

In order to evaluate the foliar application of iron and zinc on some quantitative and qualitative characteristics of Orlando Tangelo, an experiment was performed on 5-year-old trees in a garden in Manojan city in Kerman province. Experimental factors included zinc and iron each at 3 levels (0, 1 and 2 per thousand). Results showed that the application of iron and zinc significantly increased th...

Journal: :Energy Science & Engineering 2022

Abstract A water jet with an air ring protective layer is a promising rock‐breaking and cutting rate improvement method in submerged environment, such as oil–gas drilling. The flow field characteristic determines the impinge performance affected by nozzle structure parameters. In this study, under environment was numerically simulated. obtained analyzing distributions of velocity content at dif...

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