نتایج جستجو برای: bragg peak

تعداد نتایج: 149178  

1981
ROBERT R. ZIEMER

To assess the influence of road building and logging on storm flow response, a pair of watersheds were studied at Caspar Creek near Fort Bragg in northern California from 1963 to 1975. Selection cutting and tractor yarding of 85-year-old second-growth redwood and Douglas-fir forest did not significantly affect large peak streamflows. The first streamflow peaks in the fall, however, were increas...

Journal: :Physical review letters 2007
N D Daniilidis S R Park I K Dimitrov J W Lynn X S Ling

We report small angle neutron scattering rocking-curve measurements of the flux line lattices in the peak effect region in a niobium single crystal. It is found that upon cooling in a magnetic field, the transverse orientational order as well as the longitudinal translational order grow rapidly with decreasing temperature, indicating diminishing population of defects in the ordering vortex matt...

Journal: :Optics express 2012
W Horn S Kroesen J Herrmann J Imbrock C Denz

We report the fabrication of femtosecond laser-induced, first-order waveguide Bragg gratings in lithium niobate in the low repetition rate regime. Type-II waveguides are written into an x-cut lithium niobate wafer and structured periodically to achieve narrowband reflections at wavelengths around 1550 nm. Additionally, electrodes are employed to allow for electro-optic tuning of the spectral re...

Journal: :Nuclear Engineering and Technology 2021

We used the GEANT4 Monte Carlo MC Toolkit to simulate carbon ion beams incident on water, tissue, and bone, taking into account nuclear fragmentation reactions. Upon increasing energy of primary beam, position Bragg-Peak transfers a location deeper inside phantom. For different materials, peak is located at shallower depth along beam direction becomes sharper with electron density NZ. Subsequen...

2009
P. Lukáš V. Davydov R. Kužel

The peak profile shape analysis has been preferentially used in evaluation of X-ray and synchrotron powder diffraction pattern. However, neutron diffraction facilities of new generation frequently offer the instrumental resolution high enough to study efficiently the effects of broadening of neutron diffraction profiles. The present paper describes the procedure for a detailed evaluation of Bra...

ژورنال: :مجله دانشکده پزشکی اصفهان 0
سمیه مالمیر دانشجوی دکتری فیزیک، گروه فیزیک، دانشگاه پیام نور، تهران، ایران علی اصغر مولوی استاد، گروه فیزیک، دانشکده ی علوم پایه، دانشگاه حکیم سبزواری، سبزوار، ایران سعید محمدی استاد، گروه فیزیک، دانشکده ی علوم پایه، دانشگاه پیام نور تهران، تهران، ایران

مقدمه: پروتون درمانی، به دلیل دارا بودن محاسن زیست شناسی پرتوی (radiobiological) و فیزیکی، از محبوبیت خاصی در بین روش های مختلف پرتودرمانی برخوردار است. در سال های اخیر، تلاش هایی برای دستیابی به هدف بهبود دز در تومور و کاهش دز در بافت های مجاور انجام گرفته است. در این راستا، استفاده از نانوذرات (nanoparticles) فلزی جهت فعال سازی تومور بسیار امیدبخش بوده است. مطالعات کیفی انجام شده روی نانوذرات...

The aim of this work is to probe the influence of nanoclay and turmeric spends content on microcrystalline of vinyl ester hybrid nanocomposites. A series of vinyl ester hybrid nanocomposites have been fabricated with varying amounts of TS viz., 0, 2.5, 5, 7.5 and 10 % w/w along with 2% nanoclay. The microcrystalline parameters such as crystallite size and lattice strain of vinyl ester hybrid na...

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