In this paper, we report the development of a high breakdown voltage InGaP/GaAs HBT process for low-to-mid power and high-voltage power amplifier operation. To achieve the high-breakdown InGaP HBT, two different collector designs and collector-etch processes were investigated. The first device process approach uses a thick GaAs collector with low n doping. The process challenges and considerati...

A four stage asymmetric type depressed collector has been designed for the Israeli mm-wave FEM that is driven by a 1.4MeV, 1.5A electron beam. After leaving the interaction section the spent beam has an energy spread of 120 keV and 75pmmmrad normalized beam emittance. Simulations of the beam transport system from the undulator exit through the decelerator tube into the collector have been carri...

The shape of a solar collector is an important factor in solar-to-thermal energy conversion. Conical shape is one of the stationary and symmetric shapes that can be employed as a solar water heater. Flow rate of working fluid on the solar collector has an important effect on the efficiency of the collector. The present study is an experimentally investigated of the performance of the solar coni...

PURPOSE To determine the composition and investigate the elastin fiber system in the juxtacanalicular tissue adjacent to and between collector channel orifices in normal human eyes. METHODS Normal human eyes (71.0 ± 8.6 years; mean ± SD; n = 4) were perfusion fixed at low (10 mm Hg) and high pressure (20 mm Hg) with 3% paraformaldehyde/0.1 M phosphate buffer. Frontal serial sections were cut ...

Garbage Collection (GC) is a process of automatic memory reclamation from the objects that are no longer required by the mutator. The execution time of the application and memory reclaimed by garbage collector are important factors that influence the selection of a specific garbage collector while selecting a specific one. The current research paper selects a suitable garbage collector on the b...

In this study, the possibility of producing coal with less than 11% ash from tailings of flotation process was investigated. The effect of six flotation parameters: collector type, collector consumption, frother type, frother consumption, pulp density and mixing rate were studied on a sample from a tailing dam. A software based experimental design approach (DX7) was applied to determine and mod...

Reference counting is a classical garbage collection method. Recently, a series of papers have extended the basic method to drastically reduce its notorious overhead and extend the basic method to run concurrently and efficiently on a modern computing platform. In this paper we investigate the use of prefetching to further improve the efficiency of the reference-counting collector. We propose p...

BACKGROUND To define the benefits of different methods for diagnosis of pediatric appendicitis in Taiwan, a nationwide cohort study was used for analysis. METHODS We identified 44,529 patients under 18 years old who had been hospitalized with a diagnosis of acute appendicitis between 2003 and 2012. We analyzed the percentages of cases in which ultrasound (US) and/or computed tomography (CT) w...

early detection of free air in the peritoneal cavity is vital in diagnosis of life-threatening emergencies, and can play a significant role in expediting treatment. we present a series of cases in which bedside ultrasound (us) in the emergency department accurately identified evidence of free intra-peritoneal air and echogenic (dirty) free fluid consistent with a surgical final diagnosis of a p...

The maximum equipment power density (e.g. in power/rack or power/area) that may be deployed in a typical raised-floor data center is limited by perforated tile airflow. In the design of a data center cooling system, a simple estimate of mean airflow per perforated tile is typically made based on the number of CRAC’s and number of perforated tiles (and possibly a leakage airflow estimate). Howev...