نتایج جستجو برای: ray laser

تعداد نتایج: 478312  

Abdoulmajid Eslami, Behzad Sadeghian, Fathallah Karimzadeh Reihane Nafar Dehsorkhi, Soheil Sabooni

In the present study, an ultrafine grained (UFG) 304L stainless steel with the average grain size of 300 nm was produced by a combination of cold rolling and annealing. Weldability of the UFG sample was studied by Nd: YAG laser welding under different welding conditions. Taguchi experimental design was used to optimize the effect of frequency, welding time, laser current and laser pulse duratio...

2010
N D Masters T B Kaiser R W Anderson D C Eder

ALE-AMR is a new hydrocode that we are developing as a predictive modeling tool for debris and shrapnel formation in high-energy laser experiments. In this paper we present our approach to implementing laser ray tracing in ALE-AMR. We present the basic concepts of laser ray tracing and our approach to efficiently traverse the adaptive mesh hierarchy.

2009
Gulseren Kayalar Alev Cevikol Gunes Yavuzer Yavuz Sanisoglu Aytul Cakci Tansu Arasıl

OBJECTIVE To evaluate how bone mineral density in the calcaneus measured by a dual energy X-ray laser (DXL) correlates with bone mineral density in the spine and hip in Turkish women over 40 years of age and to determine whether calcaneal dual energy X-ray laser variables are associated with clinical risk factors to the same extent as axial bone mineral density measurements obtained using dual ...

Journal: :Optics letters 2009
Federico J Furch Brendan A Reagan Bradley M Luther Alden H Curtis Shaun P Meehan Jorge J Rocca

We have demonstrated an 18.9 nm Ni-like molybdenum soft x-ray laser, pumped by a compact all-diode-pumped Yb:YAG laser. The solid-state pump laser produces 8.5 ps pulses with up to 1 J energy at 10 Hz repetition rate. This diode-pumped laser has the potential to greatly increase the repetition rate and the average power of soft x-ray lasers on a significantly smaller footprint.

2003
Guoyin Shen M. L. Rivers Yanbin Wang

New developments on laser heated diamond anvil cell are reported by introducing a system installed at the Advanced Photon Source (APS). With the system, a laser heating spot of 20 40 μm in diameter can be generated to temperatures over 3000 K for samples in diamond anvil cell; and the temperature gradients in the laser heated volume are less than 100 K. The system is based on the double sided l...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد شاهرود - دانشکده پزشکی 1390

nitric oxide (no) is a small molecule synthesized by most of mammalian cells with diverse biological activities including vasodilatation, host defense and wound healing. impaired wound healing is a common occurrence among diabetics and patients receiving glucocorticoid therapy. on the other hand the application of laser in biomedical area have been increased. thus, the current studies were desi...

2016
V. L. Kantsyrev K. A. Schultz V. V. Shlyaptseva A. S. Safronova I. K. Shrestha G. M. Petrov J. J. Moschella O. Chalyy

Experiments of x-ray emission from Ar, Kr, and Ar/Kr gas jet mixture were performed at the UNR Leopard Laser Facility operated with 350 fs pulses at laser intensity of 2 × 1019 W/cm2 and 0.8 ns pulses at an intensity of 1016 W/cm2. Debris free x-ray source with supersonic linear nozzle generated clusters/ monomer jet with an average density of ≥1019 cm−3 was compared to cylindrical tube subsoni...

2013
T. Hayakawa

Progress in accelerator physics and laser physics has enabled us to generate a new generation of laser Compton scattering (LCS) γ-ray beam. The LCS γ-ray beam has been used for the study of fundamental science and industrial applications. We present examples of some applications using the LCS γ-ray beam and possibility using the next generation of high-intense LCS γ-ray beam provided from the E...

2013
R. Hajima

Laser Compton scattering (LCS) light sources can provide high-energy photons from keV to MeV range. Many research and development projects of linac-based LCS sources are carried on. For the photon energies of tens keV, linac-based LCS sources realize laboratory-size X-ray sources, of which performance is potentially comparable to 2 generation synchrotron light sources. Linac-based LCS also real...

1999
T. Missalla I. Uschmann E. Förster

An effective x-ray optical method to focus keV x-ray pulses shorter than one picosecond by using spherically or toroidally bent crystals is presented. The spectral, spatial, and time-dependent properties of focusing by two-dimensional bent crystals are calculated by considering geometrical effects, physical limitation in high performance crystal optics, and reflectivities obtained by x-ray diff...

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