The HAMP domain is present in a large number of transmembrane proteins in prokaryotes including histidine kinases, adenylyl cyclases, chemotaxis receptors, and phosphatases. In this issue of Cell, Hulko et al. (2006) report the NMR structure of a HAMP domain and present data suggesting that it transduces signals through a simple rotation of its four-helix parallel coiled coil.

Earlier this year, Sydney officially opened its new water desalination plant, the largest so far in Australia and driven by renewable wind power. It is the third to open in the country but will soon be overtaken by further new desalination plants. Australia's response to the growing demand for water and the increasing scarcity and unpredictability of conventional supplies is being echoed around...

In order to give high expertise the computer aided design of mechanical systems involves specific activities focused on processing two type of information: knowledge and data. Expert rule based knowledge is generally processing qualitative information and involves searching for proper solutions and their combination into synthetic variant. Data processing is based on computational models and it...

Oil pump in diesel engine has significant effect on energy consumption and environment pollution. In this paper, the modeling and simulation of a gear oil pump used in a diesel engine and its fluid flow analysis by a solver has been explained. Also the optimization and redesign of it has been discussed and then the outcomes have been compared with the experimental and previous results. The t...

Nowadays, magnetic gears (MGs) have become an alternative choice for mechanical gears because of their low maintenance, improved durability, indirect contact between inner and outer rotors, no lubrication, and high efficiency. Generally, although these advantages, MGs suffer from inherent issues, mainly the cogging torque. Therefore, cogging torque mitigation has become an active research area....

The temperature of the bevel gear tooth surface will increase greatly because its special structure. Modal is characteristic reaction In order to design and manufacture higher quality aerial gears, it necessary study modal gears under action field. Firstly, a field calculation model established according heat transfer theory. Then, based on traditional linear theory, analysis influence was cons...

Abstract Worm gears with wheels of harder materials, such as cast iron or steel, are often prone to the damage type scuffing, which can cause a sudden and rapid failure gear box. Contact temperature is suitable criterion determine scuffing safety for other types gears. However, worm gears, load capacity calculation not available at moment. This paper presents numerical simulation that considers...