نتایج جستجو برای: high energy intensity
تعداد نتایج: 2685137 فیلتر نتایج به سال:
Characterization of high-intensity focused ultrasound (HIFU) systems using ex vivo tissues is an important part of the preclinical testing for new HIFU devices. In ex vivo characterization, the lesion volume produced by the absorption of HIFU energy is quantified as operational parameters are varied. This paper examines the three methods used for lesion-volume quantification: histology, magneti...
We have considered the self-focusing of a Gaussian laser pulse in unmagnetized plasma. High-intensity electromagnetic fields cause the variation of electron density in plasma. These changes in the special conditions cause the acceleration of electrons to the higher energy and velocities. Thus the equation of plasma density evolution was obtained considering the electrons ponderomotive force. T...
The Large Hadron Collider, presently in construction at CERN, will be filled through a set of high performance proton accelerators providing the high brightness beam needed to reach the foreseen luminosity. Although this difficult project has top priority and uses most of the CERN resources, it is nevertheless time investigating improvements of the proton accelerator complex for physical cases ...
A new high-energy parity violation (PV) experiment at SLAC as well as particle-physics experiments using future ee colliders (such as NLC) operating at energies above the scale of unification of the electromagnetic and weak interactions require a highly-polarized electron beam with intensities previously unachievable due to a surface charge limit (SCL) effect at the cathode of the polarized ele...
A getter/electrode assembly has been devised to suppress the regeneration mechanism of the electron cloud effect in the arc dipoles of LHC. The assembly consists of a copper foil electrode, supported through an insulating layer on a stainless steel skid, which would rest upon the flat bottom of the beam screen. The electrode is coated with NEG to provide effective pumping of all non-inert gases...
Initially used in the treatment of prostate cancer and uterine fibroids, the role of focused ultrasound has expanded as transcranial acoustic wave distortion and other limitations have been overcome. Its utility relies on focal energy deposition via acoustic wave propagation. The duty cycle and intensity of focused ultrasound influence the rate of energy deposition and result in unique physiolo...
سکته قلبی یکی از دلایل عمده مرگ ومیر در دنیا می باشد. پیشگیری و متدهای افزایش توانایی تحمل استرس از مهم ترین اهداف تمرینات ورزشی است، که نوع تمرینات تجویزی و بهبود شرایط قلب از طریق تمرین هنوز نیازمند مطالعات بیشتری است. هدف از اجرای این تحقیق مقایسه اثر دو شدت تمرینی مختلف (کم و زیاد) بر میزان مقاومت به ایسکمی القایی قلبی با توجه به فاکتورهای عملکردی و شیمیایی قلب در موش های نر بالغ است. در ای...
The KEK electron linac was upgraded to 8 GeV for the KEK B-Factory (KEKB) project. During commissioning of the upgraded linac, even while continuing SOR ring injections, we had achieved a primary electron beam with 10-nC (6:24 10) per bunch up to 3.7-GeV for positron generation. This could be classified as one of the brightest S-band linac’s. Since the KEKB rings were completed in December 1998...
W. Scandale , A. Carnera , G. Della Mea , D. De Salvador , R. Milan , A. Vomiero , S. Baricordi , P. Dalpiaz , M. Fiorini , V. Guidi , G. Martinelli , A. Mazzolari , E. Milan , G. Ambrosi , P. Azzarello , R. Battiston , B. Bertucci , W. J. Burger , M. Ionica , P. Zuccon , G. Cavoto , R. Santacesaria , P. Valente , E. Vallazza , A. G. Afonin , V. T. Baranov , Y. A. Chesnokov , V. I. Kotov , V. A...
background a review of the related medical journals indicates that there is no definite evidence-based option for managing large proximal ureteral stones, although many procedures such as transureteral lithotripsy (tul), shock wave lithotripsy (swl), percutaneous nephrolithotripsy, laparoscopic ureterolithotomy, and open ureterolithotomy are currently used to treat this urological problem. obje...
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