نتایج جستجو برای: several researches have been carried out recently
تعداد نتایج: 4631101 فیلتر نتایج به سال:
Background In general, different foods and food ingredients are believed to be causing hypersensitivity/allergy among the Sri Lankan population. Global epidemiological observations have revealed lists and levels of hypersensitive foods but proper researches have been carried out in Sri Lanka for identifying food allergens. This study was carried out to obtain statistical data for different food...
the growing scarcity of fresh water is driving the implementation of wastewater treatment and water reuse on an increasingly large scale. various methods have been developed and used for water reuse from wastewater; however, the membrane distillation (md) process, as a promising separation technology, has recently gained more attention. the md process is a non-isothermal membrane-based separati...
Recently, bulk nano-structured materials produced by severe plastic deformation (SPD) have attracted scientists attention. Materials produced by SPD are of great importance because of (1) non-porous structure, (2) great mechanical properties such as high strength and toughness and (3) proper dimension for mechanical and physical testing. Several methods have been introduced for imposing the s...
The chemistry of 2-oxo-1,2,3,4-tetrahydropyrimidines began to develop toward the end of 1893 year, when the first representatives of this class compounds were reported by P. Biginelli. Despite prior reports of several really effective catalytic and non-catalytic approaches towards Biginelli-type products, an overwhelming number of new catalysts for the Biginelli reaction have been recently publ...
background and objectives: there is a growing trend towards investigating natural products as sources of compounds with biological effects and many researches have been carried out in order to find effective medications against many diseases. cancer is no exception and studies focusing on evaluating the effects of different materials on dna, give valuable information in cancer researches and ca...
since the 1960s the age effects on learning both first and second language have been explored by many linguists and applied linguists (e.g lennerberg, 1967; schachter, 1996; long, 1990) and the existence of critical period for language acquisition was found to be a common ground of all these studies. in spite of some common findings, some issues about the impacts of age on acquiring a second or...
the results of researches in the field of the using x-ray in all over the world have been successful. the main subject which needs more investigation and have been allocated part of the researches in most of the atomic research institutes, is the research about possible harms of irradiated food for human beings, base on the researches, using irradiation for inhibition of sprouting and preservat...
objectives: the mean age of cigarette smoking has decreased along with an increase in its prevalence, in developing countries. the aim of this systematic review is to determine the prevalence of lifetime, current and daily smoking among middle school students in iran . methods: various search methods have been used in this study including searching different international databanks such as pubm...
the present study set out (a) to examine the categories of pedagogical knowledge related to the act of teaching of novice and experienced teachers as gleaned from their verbal report of what they were thinking about while teaching and (b) to compare the categories of pedagogical knowledge of novice and experienced teachers. the aim of comparing these two groups of teachers was to see whether di...
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