نتایج جستجو برای: alpha radiation
تعداد نتایج: 437335 فیلتر نتایج به سال:
We propose that the origin of faint, broad emission-line wings in Green Pea (GP) analog Mrk 71 is a clumpy, LyC and/or Ly$\alpha$-driven superwind. Our spatially-resolved analysis Gemini-N/GMOS-IFU observations shows these line with terminal velocity $>3000~\rm{km~s^{-1}}$ originate from super star cluster (SSC) Knot A, and propagate to large radii. The object's observed ionization parameter st...
We perform 3D radiation hydrodynamic local shearing box simulations to study the outcome of gravitational instability (GI) in optically thick Active Galactic Nuclei (AGN) accretion disks. GI develops when Toomre parameter QT \leq 1, and may lead turbulent heating that balances radiative cooling. However, cooling is too efficient, disk undergo runaway fragmentation. In fully gas-pressure-dominat...
Silicon carbide (SiC) detectors of an Ni/4H-SiC Schottky diode structure and with sensitive areas of 1-4 cm² were fabricated using high-quality lightly doped epitaxial 4H-SiC material, and were tested in the detection of alpha particles and pulsed X-rays/UV-light. A linear energy response to alpha particles ranging from 5.157 to 5.805 MeV was obtained. The detectors were proved to have a low da...
In this paper, application of the CR-39 passive nuclear track detector for spectrometry of alpha particles is investigated. To this end, a standard Am-241 source as the alpha radiation source, and brass collimators with different heights for energy determination of alpha particles were utilized. The detectors were irradiated by alpha particles in the energy range of 0.8 to 4.8 MeV and then were...
To satisfy the ever-increasing demand for higher density (functionality) and lower power (portability), the dimensions and operating voltages of the modern electronic devices are being reduced frequently. This has brought new challenges both from the technology and materials point of view. One such issue is soft error, the temporary malfunction of device caused by the effect of radiation on the...
BACKGROUND AND OBJECTIVE Low level light therapy (LLLT) is being evaluated for treating chronic and acute pain associated with rheumatoid arthritis (RA) and other inflammatory diseases. The mechanisms underlying the effectiveness of LLLT for pain relief in RA are not clear. The objectives of this study were to determine whether LLLT decreased production of pro-inflammatory cytokines by cells fr...
A 10.5 kDa non-Pfam hypothetical protein, AF1514, from the hyperthermophilic archaeon Archeoglobus fulgidus has been overexpressed in Escherichia coli, purified and crystallized using the hanging-drop vapour-diffusion method. The crystals diffracted X-rays to 2.09 A resolution and a data set was collected at 100 K using Cu K alpha radiation from a rotating-anode X-ray source. The crystals belon...
We report that radiation enhances gene therapy of a radioresistant tumor by upregulating the induction of a chimeric gene encoding a radiosensitizing protein, tumor necrosis factor alpha (TNF-alpha). We ligated the radiation-inducible CArG elements of the radiation-inducible Egr-1 promoter/enhancer region upstream to the transcriptional start site of the human TNF cDNA (pE425-TNF). This constru...
The radiation hardness of diode array devices based on silicon on insulator technology and bulk technology was investigated. The devices were exposed to 24 GeV/c protons (at CERN) up to a fluence of 4.1 10 p/cm. Charge collection following irradiation indicated a significant reduction in minority carrier lifetime. The damage constant was calculated using alpha particle spectroscopy methods. T...
ابتدا روشی برای محاسبه ی گروه گالوایی چندجمله ایهای درجه ی سوم و چهارم تحویل ناپذیر و تفکیک پذیر ، در میدان هایی که مشخصه ی آن ها $2$ نباشند ، ارائه می دهیم. سپس نشان می دهیم که تعداد نامتناهی میدان درجه ی $4$ با یک پایه ی صحیح توانی وجود دارد. همین طور اگر $p$ یک عدد اول فرد و $q=p^{m}$ و $zeta$ ، $ - q $ امین ریشه ی واحد و $o_{q}$ حلقه ی اعداد صحیح در میدان...
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