Transistor bandwidths are approaching terahertz frequencies. Paramount to high speed transistor operation is submicron device scaling. High bandwidths are obtained with heterojunction bipolar transistors by thinning the base and collector layers, increasing emitter current density, decreasing emitter contact resistivity, and reducing the emitter and collector junction widths. In mesa HBTs, mini...

Concentrating collectors are also known as focusing collectors. A parabolic trough is a type of concentrating collector in which the energy from the sunlight is reflected and focused on the absorber tube. This paper focused on the performance of parabolic trough collector which has a ceramic-Metal coating on the absorber tube. A comparison of performance has made between with and without coatin...

Data gathering is a key operator for applications in wireless sensor networks; yet it is also a challenging problem in mobile sensor networks when considering that all nodes are mobile and the communications among them are opportunistic. This paper proposes an efficient data gathering scheme called ADG that adopts speedy mobile elements as the mobile data collector and takes advantage of the mo...

It is well accepted that Garbage Collection simpliies programming, promotes modularity, and reduces development eeort. However it is commonly believed that these advantages do not counteract the price that has to be paid: excesive overheads, possible long pause times, and the need of modifying existing code. Even though there exist publically available garbage collectors that can be used in exi...

Abstract This article introduces the first of what will ultimately be two collections case studies in archaeologist–responsible/responsive artifact collector collaboration. Focused on United States, articles this issue Advances Archaeological Practice share thoughts and experiences archaeologists representing diverse employment sectors (compliance, agency, museum, university), collectors, membe...

As the complexity of computer networks increases to accommodate demand for massive connectivity and cloud services, so does probability fault occurrence surface attacks. Hence need constant monitoring network devices accurate analysis traffic patterns ensure highest performance maximum security. This requires collecting processing telemetry data from many sources in which leads extra bandwidth ...

Research into solar absorption chillers despite their environmental benefits has been limited to date mainly larger systems whilst ignoring smaller building-scale units, which can significantly benefit from the use of optimally designed, low concentrating, non-imaging optical reflectors. A chiller system designed provide year-round space cooling for a typical primary health care facility in Cai...

This work reports experimental data comparing the low frequency noise spectrum of InP based HBTs. Double heterojunction device structures are examined with and without surface passivation ledges. INTRODUCTION Compound semiconductor InP heterojunction bipolar transistors (HBTs) hold great promise for ultra high-speed analog microwave circuit applications. The low frequency noise characteristics ...