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تعداد نتایج: 3168211 فیلتر نتایج به سال:
The CSPD-1 y-ray vision system has been constructed for the energy range from 100 keV up to a few MeV, which encompasses most energies of y-ray radiation from the radioactive nuclides of interest t o nuclear facilities. The angular resolution of the system can be varied from about 7" down to 3" FWHM. The energy resolution at 662 keV is 6.8% or 8.9% FWHM depending on which of the two detectors a...
We consider the problem of finding sets of points on xy = 1, where all of the interpoint distances are rational. The search for such points has links to both congruent and concordant numbers.
اگر~ یک رابطه روی r^n باشد وt یک عملگر خطی از r^n به r^n باشد، t را نگه دارنده خطی ~ کوییم هرگاه tx~ty، x~y را نتیجه دهد.t را نگه دارنده قوی ~ گوییم هرگاه x~y اگر و تنها اگر tx~ty . برای دو بردار x,y در r^n گوییم y بردار احاطه ساز سه قطری تعمیم یافته x است (باx?_gt y نمایش داده می شود) هرگاه ماتریس سه قطری تصادفی مضاعف d وجود داشته باشد به طوری که x=dy. علاوه بر این اگر y?_gt x آن را با نماد x~...
The thermal expansion properties of the ceramic compositions Ba(1-y)La(y)Ti(1-y/4)O(3) (y = 0.0, 0.026, 0.036, 0.054) and Ba(1-y)Bi(2y/3)Ti(1-x)Zr(x)O(3) (y = 0.10; x = 0.0, 0.04, 0.05, 0.10, 0.15) were determined in the temperature range 120-700 K. We report the temperature-dependent measurements of the strain, thermal expansion coefficient and the magnitude of root mean square polarization. T...
The Yanomamö are thinly scattered over a vast and verdant tropical forest, living in small villages that are separated by many miles of unoccupied land. They have no writing, but they have a rich and complex language. Their clothing is more decorative than protective. Welldressed men sport nothing more than a few cotton strings around their wrists, ankles, and waists. They tie the foreskins of ...
There exist many results about the Diophantine equation (qn − 1)/(q − 1) = ym, where m ≥ 2 and n ≥ 3. In this paper, we suppose that m = 1, n is an odd integer and q a power of a prime number. Also let y be an integer such that the number of prime divisors of y − 1 is less than or equal to 3. Then we solve completely the Diophantine equation (qn − 1)/(q − 1) = y for infinitely many values of y....
فرض کنید g یک گروه باشد، گروه g را جابه جایی پذیری قوی یا pc-گروه می نامند،هرگاه به ازای هر x و y در g که x^m,y^n غیربدیهی هستند، اگر [x^m,y^n]=1 آنگاه [x,y]=1 . زیرگروه های فیتینگ و عمل های دارای نقطه-ثابت-آزاد نقش اساسی در مطالعه ی pc-گروه ها دارند. یکی از اهداف ما دراین پایان نامه رده بندی pc -گروه های موضعاً متناهی است که بدین منظور ابتدا p-گروه های متناهی و گروه های پوچ توان متناهی و درنهای...
As thermalisation loss is the dominant loss process in the quantum dot intermediate band solar cells (QD-IBSCs), it has been investigated and calculated for a QD-IBSC, where IB is created by embedding a stack of InAs(1-x) Nx QDs with a square pyramid shape in the intrinsic layer of the AlPySb(1-y) p-i-n structure. IB, which is an optically coupled but electrically isolated mini-band, divides th...
Background: The activity concentrations of some radionuclides in soil samples collected from 20 locations in 8 major towns in Oyo State, Southwestern Nigeria have been determined by gamma-ray spectrometry technique. Materials and Methods: The activity concentrations were determined using high-purity germanium (HPGe) detector (Canberra Industries Inc.). The outdoor absorbed dose rates in air at ...
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