نتایج جستجو برای: frequencies of occurrence
تعداد نتایج: 21169344 فیلتر نتایج به سال:
Downloading Wisdom from Online Crowds The internet and other large textual databases contain billions of documents: is there useful information in the number of documents written about different topics? We propose, based on the premise that the occurrence of a phenomenon increases the likelihood that people write about it, that the relative frequency of documents discussing a phenomenon can be ...
Impulsive and convective frequencies are one of the most important subjects for evaluation of the seismic behavior of tanks. These two frequencies are defined by Housner and used for obtaining Rayleigh damping in time history analysis. ACI 350 and NZSEE standards have suggested some analytical solutions for finding convective and impulsive frequencies. These frequencies can also extract from mo...
The subset X0 = [sequence: see text] of 20 trinucleotides has a preferential occurrence in frame 0 (a reading frame established by the ATG start trinucleotide) of protein (coding) genes of both prokaryotes and eukaryotes. This subset X0++ has the rarity property (6 x 10(-8)) to be a complementary maximal circular code with two permutated maximal circular codes X1 and X2 in frames 1 and 2 respec...
damage detection of space structures using charged system search algorithm and residual force method
changes in dynamic properties of structures indicate occurrence of damages in the structures. in this paper, a new two stage algorithm for damage detection of large structure is introduced. a modified residual force method is utilized to locate the damage regions in structures, especially barrel vaults, and then the enhanced charged system search (css) algorithm is used to quantify the amount o...
Abstract: In this research, at first, the natural frequencies of a cracked beam are obtained analytically, then, location and depth of a crack in beam is identified by neural network method. The research is applied on a beam with an open crack for three different boundary conditions. For this purpose, at first, the natural frequencies of the cracked beam are obtained analytically, to get the ex...
infant mortality and morbidity present important challenges to those concerned with community health. we did this research to study epidemiology of diseases of infancy in city of tehran. during 15 days, of 6395 deliveries in tehran hospitals a cohort of 6267 live births entered this study. follow up data were gathered in 1st, 3rd, 6th and 12th months of birth. in this period, 5382 occurrence of...
ABTRACT The use of recombinant genetic technologies for population manipulation has mostly remained an abstract idea due to the lack of a suitable means to drive novel gene constructs to high frequency in populations. Recently Gantz and Bier showed that the use of CRISPR/Cas9 technology could provide an artificial drive mechanism, the so-called Mutagenic Chain Reaction (MCR), which could lead t...
background: tumor necrosis factor-beta or lymphotoxin-alpha (lt- α ), il-4 and il-10 are determining factors in immunity against bcg. allelic polymorphisms in the regulatory regions of their genes affect the rate of cytokine production and therefore, the host’s ability in bcg containment. objective : to study the prevalence of –590 (c/t) and –592 (c/a) allelic distribution of il-4 and il-10 ...
this study intends to evaluate interchange series (2005), which are still fundamental coursebooks in the efl curriculum settings, in terms of learning objectives in bloom’s revised taxonomy (2001) to see which levels of bloom's revised taxonomy were more emphasized in these coursebooks. for this purpose, the contents of interchange textbooks were codified based on a coding scheme designed by th...
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