نتایج جستجو برای: frequency of occurrence
تعداد نتایج: 21194626 فیلتر نتایج به سال:
The present report deals with the findings from a total of 116 children or young adults with a right aortic arch. In all these cases the aortic arch was specifically studied at necropsy or could be located from angiocardiography. The diagnosis of the associated congenital cardiovascular lesions was established by cardiac catheterization, angiocardiography, operation, or post-mortem examination....
introduction: mental health has an important role in preventing psychosomatic disease, aggression and chronic stress in adolescents, for this reason this study conducted to evaluate distress factors among 13 –year- old adolescents in the selected guidance schools in kermanshah city. materials and methods : in this descriptive–analytic study, 664 students (13–year- old boys and girls)were selec...
in this thesis, phosphorus ylides [phbppy], [no2bppy] and [brbppy] have been synthesized through the formation of phosphonium salt and dihydrogenation, followed by the reaction of pd(oac)2 and the orthopalladated dinuclear complexes [pd(?-cl)(phbppy)]2, [pd(?-cl)(no2bppy)]2 and [pd(?-cl)(brbppy)]2 have been produced. the reaction of dinuclear complexes and bidentate ligands [l = bipy (2,2-bipyr...
turbulence structure on the gas side of a wavy stratified flow was experimentally investigated in a near horizontal 18.7 cm (h) 10 cm (w) 5.5m (l) rectangular duct.by applying the variable interval time averaging (vita) technique to the hot wire anemometer measurements frequency of occurrence of turbulent events were detected near the air-water interface. experimental results showed that freque...
abstract while task-based instruction is considered as the most effective way to learn a language in the related literature, it is oversimplified on various grounds. different variables may affect how students are engaged with not only the language but also with the task itself. the present study was conducted to investigate language and task related engagement on the basis of the task typolog...
learning a second or foreign language requires the manipulation of four main skills, namely, listening, reading, speaking, and writing which lead to effective communication. it is obvious that vocabulary is an indispensible part of any communication, so without a vocabulary, no meaningful communication can take place and meaningful communication relies heavily on vocabulary. one fundamental fac...
We have revealed that the co-occurrence frequency image (CFI) based on the co-occurrence histogram (CH) of the gray level value of an image has a new potential to introduce a new scheme for image feature extraction. Our method and filters are very similar to the previous methods in result but quite different in process from those which have been used so far. Thus, we could show a possibility fo...
meiotic study was performed in 11 brassica napus cultivars considering chiasma frequency anddistribution, chromosome pairing, as well as the occurrence of b-chromosomes and their effects on chiasmafrequency. such cytogenetic pairing, along with agronomic characteristics, may be used in planninghybridization among the b. napus cultivars. all the cultivars studied possessed n=19 chromosome number...
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