Quasi-keyhole is a novel approach proposed to operate the keyhole arc welding process. Because the method’s effectiveness depends on the amperage of the peak current used to establish the keyhole, this paper proposes adjusting the amperage based on the duration of the peak current, which equals the keyhole establishment time. A nominal model structure has been selected from those identified usi...

Glucose-excess cultures of Streptococcus bovis consumed glucose faster than the amount that could be explained by growth or maintenance, and nongrowing chloramphenicol-treated cells had a rate of glucose consumption that was 10-fold greater than the maintenance rate. Because N,N-dicyclohexylcarbodiimide, an inhibitor of the membrane-bound F1F0 ATPase, eliminated the nongrowth energy dissipation...

UNLABELLED Attenuation correction is recommended to optimize the performance of cardiac SPECT. The 2.5-mA CT commonly used for this purpose in myocardial perfusion SPECT is generally considered "nondiagnostic" in quality. In other areas of cardiac and hybrid imaging, diagnostically relevant abnormal findings on higher-quality CT studies have been described. The purpose of this study was to esta...

Reduction of energy consumption and rise of cooling is a major concern in the air conditioning system especially in the area with very hot weather conditions. In hot weather conditions, the air conditioner takes more electrical power consumption to bring the comfort in specified area. In many Middle East countries, the atmospheric temperature approaches 40°C to 50°C or sometimes higher. During ...

Vibrio parahaemolyticus, the cause of gastroenteritis in humans, was inactivated by alternating low-amperage electricity. In this study, the application of alternating low-amperage electric treatment to effluent seawater was investigated for the large-scale disinfection of seawater. This method was able to overcome the problem of chlorine generation that results from treatment with continuous d...

Paper-based batteries are an alternative to traditional batteries due to their low cost, portability, and simplicity to operate. In the present work, we demonstrate an improved and inexpensive paper-based aluminum-air battery employing KOH as the electrolyte with sufficient energy to power small devices. The dimensions of the device, electrode size, and electrolyte concentration were optimized ...

Welding is a very important part in the development and growth of industry because it has role engineering, repair construction. Shielded metal arc welding (SMAW) process joining two or more materials using wrapped electrode as heat energy to melt material. The purpose this study was determine effect defects that arise with current variations so optimal results obtained from 3 amperes were test...

A parametric study was carried out on a novel carbon nanotube (CNT) synthesis using 'arc-discharge in solution' (ADS). The carbon nanostructure yield as a function of time, the rate of erosion of the anode, and the rate of deposition of carbonaceous materials on the cathode electrode were investigated. Amperage dependent normalized kinetic parameters were evaluated. The production rate of carbo...

Analogies are often theoretically useful. Important principles of electricity are suggested by an analogy between water flowing through a pipe and electricity “flowing” through a wire, with voltage corresponding to pressure, amperage corresponding to the current, and so on. A basic theory of sound is suggested by an analogy between waves caused by a stone being dropped into a still lake and “so...

This paper addresses the development of an adaptive control system for keyhole arc welding process. The system developed adjusts the amperage of the peak current to achieve the desired peak current period under varying manufacturing conditions. A nominal model is selected from models identified using experimental data and is used as the a prior model of the controlled process. A predictive cont...