the main objective of the present work was to synthesis polyamide 6 through anionic polymerization of ε-caprolactam in an internal mixer. the reaction time and the rheological properties of samples during the polymerization were studied. the samples were characterized by thermo gravimetry analysis (tga), differential scanning calorimeter (dsc) and ft-ir spectrometer. the melt flow behavior and ...

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 ...

Freeze-fracture has been used to examine the effects of gentamicin on membrane structure in liposomes of different anionic phospholipids combined with a neutral phospholipid, phosphatidylcholine. The molar ratios of neutral: anionic lipid were 1:1 (high anionic lipid ratio) and 4:1 (low anionic lipid) and the liposomes were incubated with 0.1 mM (low) and 1 mM (high) gentamicin. With the anioni...