نتایج جستجو برای: seasonal variation

تعداد نتایج: 349776  

Journal: :تحقیقات جغرافیایی 0
حسین عساکره رباب رزمی قلندری گروه جغرافیا دانشگاه زنجان

precipitation regime refers to distribution of seasonal- monthly precipitation. by studying this character, it could be find out about the most important parts of mechanism(s) dominant in temporal distribution of precipitation. precipitation regime can have positive or negative effects on other environmental components performance. in the present research, the monthly data in 73 stations during...

پایان نامه :دانشگاه تربیت معلم - تهران - دانشکده علوم انسانی 1390

به منظور شناسایی تغییر اقلیم در ایران، الگوهای فشار سطوح بالای جوی مطالعه شد. ابتدا با استفاده از داده های ارتفاعی روزانه سه سطح عمده جوی 500، 700 و 850 هکتوپاسکال در دوره 1948-2010 برای محدوده 10 تا 70 درجه شمالی و 10 تا 80 درجه شرقی، مراکز فعالیت شناسایی شدند. روش تحلیل مولفه های اصلی برای تعیین مراکز فعالیت استفاده شد. نتایج نشان داد 7 مولفه عمده با یکدیگر نزدیک به 90 درصد واریانس را توجیه م...

Journal: :international journal of environmental research 0
a. kavian department of rangeland & watershed management engineering, sari agricultural sciences and natural resources university, sari, iran y. fathollah nejad department of rangeland & watershed management engineering, sari agricultural sciences and natural resources university, sari, iran m. habibnejad department of rangeland & watershed management engineering, sari agricultural sciences and natural resources university, sari, iran k. soleimani department of rangeland & watershed management engineering, sari agricultural sciences and natural resources university, sari, iran

there is a need to analyze and map rainfall erosivity to assess soil erosion at the regional scale. the objectives of this study were to develop a regional model to estimate seasonal erosivity from seasonal rainfall data and to study temporal and spatial distribution of rainfall erosivity for the gorganrood drainage basin in the northeast of iran. six gauging stations with a high temporal resol...

2014
Varun Kumar Abhay Singh Mrinmoy Adhikary Shailaja Daral Anita Khokhar Saudan Singh

Background. It is highly cost effective to detect a seasonal trend in tuberculosis in order to optimize disease control and intervention. Although seasonal variation of tuberculosis has been reported from different parts of the world, no definite and consistent pattern has been observed. Therefore, the study was designed to find the seasonal variation of tuberculosis in Delhi, India. Methods. R...

Journal: :Cancer research 1981
B Paigen E Ward A Reilly L Houten H L Gurtoo J Minowada K Steenland M B Havens P Sartori

A seasonal variation was observed when aryl hydrocarbon hydroxylase (AHH) activity was measured in the cultured lymphocytes of 977 donors over a period of 2 1/2 years. The variation was strongest in AHH activity induced by 3-methylcholanthrene and was less apparent for AHH activity in lymphocytes grown without any inducer. The period of the seasonal variation is 1 year, and maximal induced AHH ...

Journal: :Applied human science : journal of physiological anthropology 1998
Y Nakamura K Okamura

The seasonal variation of sweating responses under identical heat stress was investigated to make clear the seasonal acclimatization in daily human life on the experiments. The heat stress of 33 degrees C air temperature, 50% relative humidity laid in the experiments was chosen as a usual daytime condition in summer in metropolitan cities such as Tokyo and Osaka. Five subjects were exposed unde...

Journal: :Applied and environmental microbiology 1987
J Iriberri M Unanue I Barcina L Egea

The abundance and heterotrophic activity of attached and free-living bacteria were examined seasonally in coastal water. Heterotrophic activity was determined by the uptake of [C]glucose. The density of attached bacteria was always minor, not showing a seasonal variation, whereas the free-living bacteria were more numerous and showed a marked seasonal variation, their density being higher under...

Journal: :Industrial health 2012
Hiroaki Itoh Ippei Mori Yuki Matsumoto Syou Maki Yasutaka Ogawa

Although seasonal variation in high-sensitivity C-reactive protein (hsCRP) has been studied cross-sectionally and longitudinally, the results to date have been mixed. Here, to test seasonal variation in this compound with regard to within-subject, inter-day variation, we conducted a longitudinal follow-up study with repeated measurements in Japanese workers with low hsCRP. Blood samples were ob...

Journal: :thrita 0
fatemeh toorang cancer research center, cancer institute of iran, tehran university of medical science, tehran, ir iran anahita houshiarrad department of nutrition research, national nutrition and food technology research institute, faculty of nutrition sciences and food technology, shahid beheshti university of medical sciences, tehran, ir iran; department of nutrition research, national nutrition and food technology research institute, faculty of nutrition sciences and food technology, shahid beheshti university of medical sciences, tehran, ir iran. tel: +98-9125507026 morteza abdollahi department of nutrition research, national nutrition and food technology research institute, faculty of nutrition sciences and food technology, shahid beheshti university of medical sciences, tehran, ir iran mina esmaili department of nutrition research, national nutrition and food technology research institute, faculty of nutrition sciences and food technology, shahid beheshti university of medical sciences, tehran, ir iran soraya ebrahimpour koujan department of nutrition, schools of health and nutrition, tabriz university of medical sciences, tabriz, ir iran

conclusions due to seasonal variations in fruit and vegetable dietary intakes, the interventional and case-control studies should consider seasonality. educational and price controlling programs may control such observed seasonality in the intake of fruit and vegetables. results the highest consumption of vegetables was seen in summer (289 ± 3.4 g/day) while the lowest was in winter (224 ± 3.2 ...

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