نتایج جستجو برای: Beams

تعداد نتایج: 33005  

2004
STEFANO FORTE

Physics with neutrino beams has played a crucial role in establishing the standard model and its structure, specifically in leading to the discovery of weak neutral currents and of their properties. Currently, while the physics of neutrinos gives us the first evidence of physics beyond the standard model, the use of neutrinos as probes appears to be the only way of accessing subtle details of t...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شیراز - دانشکده علوم 1390

any change in the refractive index of a laser active medium can lead to serious degradation of beam quality, laser beam modes, laser performance and variation in the intensity distribution. alteration in the refractive index of laser active medium is especially notable in high power lasers. it is clear that in the laser beam production, the pumping agent induces a great amount of heat which...

2016
Ching-Han Yang Yuan-Di Chen Shing-Trong Wu Andy Ying-Guey Fuh

We present a simple and flexible method to generate various vectorial vortex beams (VVBs) with a Pancharatnam phase based on the scheme of double reflections from a single liquid crystal spatial light modulator (SLM). In this configuration, VVBs are constructed by the superposition of two orthogonally polarized orbital angular momentum (OAM) eigenstates. To verify the optical properties of the ...

1999
Luigi DiLella

Since the first detection of the neutrino at reactors [1] and the discovery of the νμ at the Brookhaven AGS [2], accelerators and reactors have been used to provide intense beams of neutrinos. Over the last 30 years, experiments with neutrino beams have played a major role in shaping the Standard Model of particle physics as it is known today. At present, electroweak theory is more conveniently...

Journal: :journal of rehabilitation in civil engineering 2014
azadeh alsadat asghari zahra tabrizian morteza hossein ali beigy gholamreza ghodrati amiri bahram navayineya

. this paper presents the results of an experimental investigation on shear strength enhancement of reinforced concrete deep beams externally reinforced with fiber reinforced polymer (frp) composites. a total of six deep beam specimens of two different classes, as-built (unstrengthened) and retrofitted were tested in the experimental evaluation program. two composite systems namely carbon/epoxy...

Journal: :iranian journal of radiation research 0
h. foroutan nuclear science research school, nuclear science and technology institute, tehran, iran m. hodabakhsh nuclear science research school, nuclear science and technology institute, tehran, iran m. rabbani nuclear science research school, nuclear science and technology institute, tehran, iran

background: a dressing often covers the wound to accelerate its healing. hydrocolloid-type dressing to give better conditions for healing has been developed consisting of gelatin, pectin, water and hydrophilic polymer which promote healing. in recent years, much attention has been focused on the research and development of polymer hydrogels as biomaterials, such as contact lenses, wound dressin...

Journal: :Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology 2010
Alireza Naseri Asghar Mesbahi

In radiation therapy with high-energy photon beams (E > 10 MeV) neutrons are generated mainly in linacs head thorough (γ,n) interactions of photons with nuclei of high atomic number materials that constitute the linac head and the beam collimation system. These neutrons affect the shielding requirements in radiation therapy rooms and also increase the out-of-field radiation dose of patients und...

2001
Y. Iwashita A. Morita

Large energy spread of muon beams can be reduced by so-called phase rotation. It requires rather low frequency or long slope in the RF waveform and rather high gradient field against the short muon lifetime. Because such a low frequency high gradient RF cavity is difficult to construct, a high frequency bunching system is proposed. The bunching system located after 100m from a production target...

Journal: :مهندسی عمران فردوسی 0
ابوالفضل عربزاده اصغر امانی داشلجه ایرج محمودزاده کنی سعید اینانلو

deep beams are type of beams which their behavior is different from conventional beams because of their particular type of geometry. in this paper, the retrofitting of these beams is considered and 10 deep beams are tested experimentally and discussed about retrofitting methods. experimental studies indicate that the use of cfrp bands in the direction perpendicular to diagonal cracks in compari...

Journal: :iranian journal of radiation research 0
y.j. go college of veterinary medicine, kyungpook national university, korea j.h. shin college of veterinary medicine, kyungpook national university, korea k.s. jeong college of veterinary medicine, kyungpook national university, korea s.j. park college of veterinary medicine, kyungpook national university, korea s.h. kim college of veterinary medicine, chonnam national university, korea s.y. ryu college of veterinary medicine, chungnam national university, korea

background: the purpose of this paper is to establish an easy and reliable biodosimeter protocol to evaluate the biological effects of proton beams. materials and methods: human peripheral blood lymphocytes were irradiated using proton beams (let: 34.6 kev μm−1), and the chromosome aberrations induced were analyzed using cytokinesis-blocked (cb) micronucleus (mn) assay. to determine the efficie...

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