this paper explores the importance of oil sector in providing input for economic sectors and also its changes during the last decades in iran. to that end, the partial and total forward linkage between oil sector and other domestic production sectors as well as their changes are examined using the input-output tables of the years 1986 and 2001. and also based on the information on hand, perform...

A group of destructive changes occurring in jaws in patients with maxillary complete dentures and mandibular removable partial dentures (bilaterally) has been described in the literature as the combination syndrome. However, this condition is not clinically observed in all patients. The aim of this study was to establish the prevalence index on signs of combination syndrome and to verify whethe...

the arthroscopic study of knee joint is of outstanding interest in assessment of knee complaints. the present article describes the results of arthroscopic examination of 100 patients (mean age 29.4 years 82% male) evaluated from 1996 to 1997 in imam khomeini hospital of tehran. sport injury was the most prevalent cause of referral (40%). the 2 most frequent complaints were knee pain (94%) and ...

In this paper, Ni/Al and La-Ni/Al catalysts were prepared with a co-impregnation method and employed in carbon dioxide methanation reaction. The catalytic results showed that the catalyst with (10wt.%) of lanthanum and (20wt.%) nickel had the highest activity at low temperatures in CO2 methanation and the La-Ni/Al catalysts changed the reaction path by lowering its activation energy and consequ...

abstract: urinary bladder hemangiomas are very rare and accounting for 0.6% of all urinry bladder toumors. it is rare cause of hematuria. a 8-year old boy presented with painless gross hematuria for one week. he had past history of this problem 5 months ago. physical examination revealed no unusual findings. sonogeraphy and ct scan showed intraluminal bladder mass with exteravesical cyctic comp...

introduction: to describe the underlay tympanoplasty technique using an acellular dermal graft(alloderm) for tympanic membrane (tm) reconstruction in a guinea pig model and to demonstrate the feasibility of the technique using alloderm tissue harvested from the prepuce as a source of tissue for future grafting in human tm reconstruction.   materials and methods: the prepuce was divided during c...

considering the importance of increase in production and supply of agricultural products in iranian economic development, this study was carried out to investigate the impact of factors influencing the acreage (as a proxy for planned production and supply) of five important crops , namely wheat, barley, potatoes, sunflower and cotton. the seemingly unrelated regression estimation (sure) was use...

background and objective: evaluation of degenerative changes of motoneurons and their related synapses can be useful in understanding the mechanisms of neurodegenerative diseases and their potential treatment. the present electron microscopic and immunohistochemical study investigates the axotomy-induced changes of adult spinal motoneurons up to 3 months following sciatic nerve transection. mat...

Although cross-sectional (between-person) comparisons consistently reveal age-related cognitive declines beginning in early adulthood, significant declines in longitudinal (within-person) comparisons are often not apparent until age 60 or later. The latter results have led to inferences that cognitive change does not begin until late middle age. However, because mean change reflects a mixture o...