نتایج جستجو برای: northern alborz
تعداد نتایج: 112950 فیلتر نتایج به سال:
according to the increased fungi contaminations and related damages, microbiologist's incentive in considering the fungal contaminations in human habitats had increased. some of fungi cause disease through production of toxins in animals as well as humans. since these toxins are not easily distinguishable, then it is crucial to study their characteristics. aspergillus are among the most importa...
This paper introduces a study of morphotectonic structure in the Central Alborz Basin, Mazandaran province of Iran (about 1200 square kilometer), using Russian KFA-1000 satellite photography and sequential air photographs. The KFA-1000 metric camera has better ground resolution than SPOT and LANDSAT for the whole of the study area. Results are provided from one pair of 30×30 cm. photos, which p...
New attenuation relationships for rock and soil in Alborz, have been developed in this study. When the quantity of usable ground-motion data is inadequate in the magnitude and distance ranges, development of an empirical prediction equation is deficient. Due to lack of data, the two well-known simulation techniques, point source and finite-fault models have been used to generate more than ten t...
In northern hillside of Central Alborz, south of the Kamarbon village, there is an outcrop of alkaline gabbro that has fine grain theralite in margins and toward the center, changes to coarse grain teschenite. In the teschenitic rocks the main minerals are diopside clinopyroxenes and rhonite. In this research, the occurrence of this mineral in Kamarbon gabbroic intrusion is reported and its min...
The Alborz structural zone in northern Iran is the host of a number of bauxite deposits. The Gheshlagh bauxite deposit is one of them with more than 2 km long and a thickness of about 20 m in the eastern part of the Alborz structural zone. This deposit has been developed as a stratiform horizon along the contact zone of Permian limestones and Triassic dolomitic limestones. The basal contact zon...
Springs are the important water resources, which thier study is necessary in terms of their management and exploitation. In northern Iran, the karst springs locate in the central Alborz highlands and alluvial springs on the Caspian southern coasts.The Karst and alluvial springs discharge is variable because of different conditions in terms of aquifer, topography and precipitation .This study ha...
Composition of the Kiyamaki dome has mostly dacite and granodiorite in rims, with SiO2 contents ranging from 64 to 73 wt% and Mg# values ranging from 27 to 57. These rocks are high-Si adakite. Geochemical characteristics and Sr and Nd isotopic rates indicate that the rocks of Kiyamaki dome are a post-collisional adakite. Combined geochemical and Sr–Nd isotope data suggest that the Kiyamaki adak...
hyrcanian forests in northern slope of alborz support high bird richness and abundance same as central of europe. in this study, efficiency of different methods including fixed-width transect, variable-width transect, fixed-radius point count and variable circular plot samplings were compared in order to present the most reliable methods for surveying and monitoring of diurnal forest birds in f...
Teherán az Alborz hegység déli lábánál, 1200-1600 méter közötti magasságban helyezkedik el, egy, a hegyekkel keletről és nyugatról is körülölelt völgyben. A város meghatározó földrajzi adottsága az, hogy területe északról dél felé lejt, vagyis tengerszint feletti magasság ellenére jól benapozott, kellemes klímájú.
1. introduction nowadays, remote sensing is considered as an important subject in many field studies, like agronomy, hydrogeology, mineral exploration, geography and geology. this knowledge has been applied in most of the geological fields. the significant application of remote sensing is preparation of lineament maps that is an important issue in the geological studies. in the remote sensing s...
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