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Issue Info: 
  • Year: 

    2012
  • Volume: 

    9
  • Issue: 

    3
  • Pages: 

    93-110
Measures: 
  • Citations: 

    0
  • Views: 

    1100
  • Downloads: 

    0
Abstract: 

In the present study depositional temperature, diagenetic type and major climatic changes are investigated using oxygen and carbon stable isotopes. For this purpose, a sediment core (140 cm long) of 12 Km distance from the coast (near Langroud city), was collected from the southern Caspian Sea. A sedimentation rate of 0.9 cm/year was obtained based on a 210Pb and 137Cs isotope study of the sediment core. The depositional temperature and diagenetic type were obtained based on Mass Spectrometry analysis of sediment samples. The oxygencarbon isotope study indicates a very low depth of burial diagenesis. Water temperature based on the heaviest oxygen isotope value with least alteration, shows around 21oC during sedimentation, (120 years ago) while CTD results during sampling show the same result, so it seems that there have been no major climatic changes in the study area.

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Journal: 

JOURNAL OF RADAR

Issue Info: 
  • Year: 

    2016
  • Volume: 

    3
  • Issue: 

    4 (SERIAL NO. 10)
  • Pages: 

    53-63
Measures: 
  • Citations: 

    0
  • Views: 

    959
  • Downloads: 

    0
Abstract: 

In this paper, the detector of a moving target in MIMO radar with widely separated antenna in the presence of the a-stable clutter is proposed. Due to the complexity of the unknown parameter estimation in the presence of the target, the Rao test is applied. The a-stable model is a general model that can be applied to different environments with appropriate selection of parameters. The problem with this model is inexistence of a closed form for the probability density function of the distribution. Fortunately, there are models that approximate the distribution by a closed form expression. In the present paper, mixing of Gaussian and Cauchy model is used for expressing clutter. Finally, the performance of the proposed detector is compared with the optimal Gaussian and MiniMax detector by a graph of the probability of detection versus signal-to-clutter ratio. The simulation results, show that the performance of the proposed detector is better than the optimal Gaussian and MiniMax detector.

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Issue Info: 
  • Year: 

    0
  • Volume: 

    22
  • Issue: 

    98
  • Pages: 

    0-0
Measures: 
  • Citations: 

    0
  • Views: 

    857
  • Downloads: 

    0
Abstract: 

سابقه و هدف: بیماری کرونری قلب (Coronary Artery Disease) اولین علت مرگ در جوامع امروزی و اولین علت مخارج بهداشتی فرد را تشکیل می دهد. عوامل خطر متعددی را برای ابتلاء به بیماری عروق کرونر مطرح می کنند که از جمله این ریسک فاکتورها بالا بودن سطح سرمی اسید اوریک به عنوان فاکتوری التهابی می باشد. بر همین اساس این مطالعه جهت بررسی میزان سطح سرمی اسید اوریک وشدت درگیری عروق کرونر در آنژیوگرافی در بیماران مبتلا به Chronic Stable Angina با در نظر گرفتن و تنظیم سایر ریسک فاکتورها مانند سن، سیگار، هایپر تنشن، هایپر لیپیدمی و دیابت انجام شده است.مواد و روش ها: این مطالعه به صورت cross-sectional تحلیلی جهت بررسی سطح اسید اوریک سرمی و شدت درگیری عروق کرونر در آنژیوگرافی در 201 بیمار مبتلا به آنژین صدری مزمن صورت گرفته است. سایر عوامل خطر شایع بیماری قلبی - عروقی نیز شامل دیابت، فشارخون، هایپرلیپیدمی، سن و مصرف سیگار نیز در بیماران ثبت و در بررسی ارتباط در نظر گرفته شدند.یافته ها: در این مطالعه بیماران شامل 78 بیمار زن (39 درصد) و 123 مرد (61 درصد) بودند. عوامل خطر شامل دیابت، فشارخون، سن، هایپرلیپیدمی و اسید اوریک در دو جنس مرد و زن تفاوت معنی داری نداشته است. میانگین شدت درگیری کرونر در بیماران مورد مطالعه 15.8±10.7 بوده، میانگین سطح اسید اوریک 10.5±6.0 mg/dl بوده است که ارتباط مثبت و معنی داری بین آنها هم در زنان و هم در مردان وجود داشته است (ضریب همبستگی0.510=pearson ، p<0.0001، ضریب همبستگی 0.537= pearson، p<0.0001). همچنین ارتباط معنی داری بین شدت درگیری عروق کرونر با پرفشاری خون، سن و سابقه دیابت و هایپرلیپیدمی وجود داشت. آنالیز آماری چندگانه نیز نشان داده است که 15 درصد این تغییرات مربوط به اسید اوریک می باشد.استنتاج: با توجه به یافته های این مطالعه، به نظر می رسد که بین سطح اسید اوریک سرم و شدت CAD ارتباطی مستقل وجود داشته باشد.

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Conference: 

IRANIAN ALGEBRA SEMINAR

Issue Info: 
  • Year: 

    2016
  • Volume: 

    25
Measures: 
  • Views: 

    170
  • Downloads: 

    54
Abstract: 

LET R BE A COMMUTATIVE RING WITH IDENTITY. WE WILL SAY THAT AN R-MODULE M IS IDEAL STABLE, IF IM=M, WHEREI IS AN IDEAL OF R, IMPLIES THAT IX=RX FOR ALL X Î M. IN THIS PAPER, WE WILL STUDY IDEAL STABLE MODULES. AMONG OTHER RESULTS, IT IS PROVED THAT IF R IS AN ARTINIAN RING, THEN EVERY R-MODULE IS IDEAL STABLE AND THE CONVERSE IS TRUE IF R IS NOETHERIAN.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Issue Info: 
  • Year: 

    1390
  • Volume: 

    18
Measures: 
  • Views: 

    357
  • Downloads: 

    0
Abstract: 

لطفا برای مشاهده چکیده به متن کامل (pdf) مراجعه فرمایید.

Yearly Impact:   مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Writer: 

DIBAJNIA M.

Issue Info: 
  • Year: 

    1995
  • Volume: 

    2
Measures: 
  • Views: 

    122
  • Downloads: 

    0
Abstract: 

THE IMPLEMENTATION OF MANY CIVIL ENGINEERING PROJECTS DURING THE FAST FINANCIAL DEVELOPMENT PERIOD OF INDUSTRIAL COUNTRIES LIKE JAPAN HAS CAUSED THE DESTRUCTION OF A CONSIDERABLE PART OF THEIR COASTS. FOR INSTANCE, ONLY IN A FIFTEEN-YEAR PERIOD BETWEEN 1978 AND 1992, A 2, 395-HECTARE AREA OF JAPANESE SANDY COASTS HAS BEEN DESTRUCTION. IF WE ADD THE GRAVELLY COASTS TO THIS NUMBER DURING THE SAME PERIOD, AN STRIP OF 2.5 METERS HAS BEEN REDUCED FROM THESE COASTS. IN OTHER WORDS, THE SANDY AND GRAVELLY COASTS OF JAPAN RECEDE BY AN AVERAGE OF ONE METER EVERY SIX YEARS.NOW, THE FINANCIAL GROWTH PERIOD HAS PASSED AND THERE IS A RELATIVE RELIEF IN THESE COUNTRIES, AND THE IMPORTANCE AND NECESSITY OF THE SANDY COASTS IS NOW CLEAR, UNFORTUNATELY AFTER THE DESTRUCTION, WITH THE ISSUE OF RESTORING AND STABILIZING THEM IS NOW THE GROWING CONCERN. IN GENERAL, THE SEDIMENT MOVEMENT IN THE NEAR-COASTAL WATERS OCCURS UNDER THE IMPACT OF WAVES AND THE CURRENTS OF THE AREA. IN THIS ARTICLE, AFTER REVIEWING THE ABOVE FACTORS, A BRIEF DISCUSSION FOLLOWS ABOUT HOW THE SEDIMENT (MAINLY PEBBLES) MOVES IN THAT AREA AND WHAT IMPACTS IT HAS ON THE SHAPE OF SEABED AND COASTLINE. AFTERWARDS, THE CAUSES OF EROSION, SANDY COASTS RECESSION AND ITS CONSEQUENCES ARE DISCUSSED, AND SANDY COAST EROSION PREVENTION TECHNIQUES, THEIR ADVANTAGES AND DISADVANTAGES ARE POINTED OUT AT THE END.

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Issue Info: 
  • Year: 

    2010
  • Volume: 

    13
  • Issue: 

    -
  • Pages: 

    0-0
Measures: 
  • Citations: 

    1
  • Views: 

    201
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

Issue Info: 
  • Year: 

    2019
  • Volume: 

    171
  • Issue: 

    -
  • Pages: 

    862-863
Measures: 
  • Citations: 

    1
  • Views: 

    99
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 99

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Author(s): 

Journal: 

CELL

Issue Info: 
  • Year: 

    2020
  • Volume: 

    181
  • Issue: 

    5
  • Pages: 

    0-0
Measures: 
  • Citations: 

    1
  • Views: 

    32
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Author(s): 

KOHLER J.M. | FLANAGAN S.P.

Issue Info: 
  • Year: 

    2010
  • Volume: 

    24
  • Issue: 

    2
  • Pages: 

    313-321
Measures: 
  • Citations: 

    1
  • Views: 

    106
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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