نتایج جستجو برای: cathode ray tubes
تعداد نتایج: 339874 فیلتر نتایج به سال:
The acute effect of caffeine on the retinal circulation was studied in 14 healthy volunteers using the blue field simulation technique, which provides measurements of the velocity of leukocytes flowing within the macular capillaries. Subjects adjusted the mean velocity (Vm) of computer-simulated leukocytes moving on a cathode ray tube screen to match that of their own entoptically perceived leu...
OBJECTIVE To present a new stimulation method based on the use of a head-mounted display (HMD) during pattern reversal visual evoked potential (PR-VEP) testing and to compare variables of HMD to those of conventional cathode ray tube (CRT). METHODS Twenty-three normal subjects without visual problems were recruited. PR-VEPs were generated using CRT or HMD stimuli. VEP outcome measures include...
OBJECTIVES The analysis goal was to estimate incremental cost-effectiveness ratios (ICERs) for the Comparison of Medical Therapy, Pacing, and Defibrillation in Heart Failure (COMPANION) trial patients who received cardiac resynchronization therapy (CRT) via pacemaker (CRT-P) or pacemaker-defibrillator (CRT-D) in combination with optimal pharmacological therapy (OPT) relative to patients with OP...
The operation and accumulation of liquid water within the cell structure of a polymer electrolyte membrane fuel cell (PEMFC) with a dead-ended anode is observed using neutron imaging. The measurements are performed on a single cell with 53 square centimeter active area, Nafion 111-IP membrane and carbon cloth Gas Diffusion Layer (GDL). Even though dry hydrogen is supplied to the anode via press...
Carbon Nano Tubes (CNT’s) as field-emitters have been investigated for more than two decades and can produce relatively low emittance electron beams for a given cathode size. Unlike thermionic cathodes, CNT cathodes are able to produce electrons at room temperature and relatively low electric field (a few MV/m). In collaboration with FermiLab, we have recently tested CNT cathodes both with DC a...
During World War I, when it became increasingly difficult for physicians in many European countries to have their defective X-ray tubes repaired or replaced, since most of these tubes were produced by German-based companies, Dutch physicians made an urgent request to Philips, asking the company if they could repair their X-ray tubes. Because Philips had the necessary expertise in glass and vacu...
BACKGROUND Ventricular arrhythmias are common in patients with left ventricular assist devices (LVADs) but are often hemodynamically tolerated. Optimal implantable cardioverter defibrillator (ICD) tachy-programming strategies in patients with LVAD have not been determined. We sought to determine if an ultra-conservative ICD programming strategy in patients with LVAD affects ICD shocks. METHOD...
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