Improved ab-initio calculation method for GexSi-x alloys

Abstract

GexSi1-x alloy, a complete solid-solution semiconductor with a diamond structure which contains two face-centred cubic (fcc) sublattices shifted by one quarter along the body diagonal, is one of the most promising material systems in the field of high performance Thermoelectric (TE) materials, having a series of TE applications. Also, due to its excellent potential in energy gap engineering and lattice parameter engineering, GexSi1-x is widely used in preparation of microelectronics, optoelectronic devices and various functional materials, such as making photoconductive detectors and integrated optoelectronic devices.

Syngas Fermentation to Alcohols: Reactor Technology and Application Perspective

“…Sun et al provide a description of patents in the field of synthesis gas fermentation with focus on microorganisms and gene manipulation, process development and control as well as reactor design . Selected examples for reactor design and process development are , , , , , . Reports on synthesis gas fermentation with a reactor scale > 5 L can be found almost exclusively in patent examples (Tab.…”

“…The required power input is determined by the flow rate of the pump and the substrate gas volume flow. In order to avoid high energy costs, GLMT should be optimized not by the conventional increase of gas or liquid flow rates but, e.g., by installing internal packings , improved gas delivery systems , or using other supporting technologies . An increased mass transfer driving force by moderate pressurization is additionally advisable , , as the enhanced solubility at higher pressure improves substrate gas availability for the biocatalyst.…”