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پژوهش های انجام شده در حوزه ی مدیریت پروژه ها عمدتاً بر موازنه ی زمانٓـ هزینه تمرکز داشته اند، اما اخیراً عامل کیفیت به عنوان یکی از معیارهای اساسی موفقیت پروژه بسیار مورد توجه است. از این رو در این تحقیق، مدل جدیدی برای مسئله ی موازنه ی زمانٓـ هزینهٓـ کیفیت در حالت گسسته پیشنهاد شده که برخلاف مدل های سنتی که در آن ها تنها یک نوع رابطه ی پیش نیازی بین فعالیت ها وجود دارد، روابط وابستگی بین فعالیت ها...
plant growth promoting rhizobacteria and arbuscular mycorrhizal fungi can inhanced plant growth by increasing nutrient uptake. in order to investigate the effect of pgpr and amf on some morphological parameters, macro (nitrogen, phosphorus, potassium, calcium and magnesium) and micro (iron, zinc and copper) nutrients uptake, percentage of root colonization and some morphological factors of pepp...
the essential oils isolated by hydrodistillation from the leaves of two eucalyptus gillii maiden and e. microcarpa subsp. macrocarpa hook were analysed by gc and gc/ms. the main components identified in e. gillii oil were 1, 8-cineole (79.5%), trans-pinocarveol (8%) and ?-pinene (2.7%), and in e. microcarpa were 1, 8-cineole (77.3%), ?-pinene (5.6%) and terpin-1-ol (5.1%). oils with high conten...
glucose-6-phosphate dehydrogenase (g6pd) is a greatly polymorphic enzyme encoded by human x-linked gene. g6pd deficit is the most public enzymopathy in human with about 400 million people affected globally. it is the main controlling enzyme in the hexose monophosphate shunt catalase the oxidation of glucose-6-phosphate to 6-phosphogluconolacton and the creation of reducing equals in the form o...
s i n c e t h e l a t e 1960s, s e v e r a l c o n s t i t u t i v e m o d e l s h a v e b e e n d e v e l o p e d f o r s a n d s d e s c r i b i n g t h e i r s t r e s s-s t r a i n e h a v i o r. m o s t o f t h e s e m o d e l s w e r e e s t a b l i s h e d b a s e d o n a m e a s u r e o f t h e p l a s t i c w o r k a n d s o m e y i e l d c r i t e r i a, a m o n g t h e m b e i n g t ...
background: medulloblastoma is the most common malignant brain tumor in children. the important factors in predicting survival are the extent of disease, proliferation index of the tumor cells, histopathologic class and the age at diagnosis. the percentage of ki-67 positive cells reflects the proliferation of the cells and is one of the critical factors which determine the growth of the tumor....
abstract background: cosmetic rhinoplasty is now carried out increasingly in an attempt to solve the psychological and social problems of people who are discontent with their nose. little is known about either the psychological status of persons who seek rhinoplasty or potential psychological changes following surgery. the challenge that faces surgeons, is how to identify, before surgical int...
in this research, the influence of adding micro- and nano- sized calcium carbonate powders to nylon-66 was investigated. mechanical properties of micro and nano- composites, including tensile strength, elongation, and young’s modulus, before and after ageing, were determined and analyzed. for this purpose, micro- and nano-sized caco3 particles were used as fillers to prepare micro-composites (c...
improving the processing and the recycled paper properties is one of permanent concern of papermaking. in this research, the effect of nanochitosan addition on the process and product quality made of writing and printing recycled fiber was investigated. being nano size and so its capability in access to the space between pulp suspension components and also its probable ability to make electrost...
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