kocho and bula are fermented product of enset (ensete ventricosum). it is the staple food for 20 million people in ethiopia. the aim of study was to isolate, identify and characterize yeast species from fermented kocho and bulla by using biolog micro station. 300 kocho samples were collected from angacha district. 0.1ml of serially diluted samples were streaked on yeast pepton dextrose agar and...

Ultrasound wave is a kind of waves with the frequency higher than the human audible frequency. Although ultrasound was first used for military identification purposes, it has been used for decades for various other applications, especially medical applications. Medical applications of ultrasound include diagnostic and therapeutic applications, such as for the treatment of cancer. In this paper,...

Introduction: Micro-perforated absorbents are one of the structures that are widely used nowadays. The sound absorption mechanism is performed by viscous energy losses in the cavities on the plate. In this study, the acoustic properties of non-flat perforated panels in oblique angle was investigated in numerical method. Material and Methods: This paper examined the effect of the surface shape ...

Background and Objectives: Furfural (F) and hydroxymethyl furfural (HMF) are cyclic aldehydes, which are formed during the heat processing of foods. These chemical contaminants have received much attention due to their suspected health hazards and heat damage indicators. The aim of the present study was extraction and determination of F and HMF in baby-foods using dispersive liquid-liquid micro...

In this paper, the modified couple stress theory is used to study vibration analysis of functionally graded rectangular micro-plates. Considering classical and first order plate theories, the couple governing equations of motion are obtained by using the Hamilton’s principle. Considering an assumed mode method, the accurate size dependent natural frequencies are established for simply supported...

Using a discourse analytic qualitative approach, we investigated the naturally-occurring discourse that arose as part of two kinds of regular course activities, synchronous and asynchronous computer-mediated discussions. The messages contributed by members of a graduate course were analyzed for the kind of discourse functions and the kind of politeness strategies they displayed. Results indicat...

Recent advances in the fabrication of microflow devices using micro-electromechanical systems (MEMS) technology are described. Passive and active liquid flow control and particle-handling methods in micrometer-scale channels are reviewed. These methods are useful in micro total analysis systems (μTAS) and laboratory-on-a-chip systems. Multiple flow control systems (i.e., arrayed microvalves) fo...

This paper shows firm level micro analysis of information network use and its impact on firm’s productivity. New evidences on economic impacts of IT by type of its application are provided, based on METI’s firm level data of Japanese manufacturers and distributors. It is found that productivity impact of information network use is different, depending on application of network. In addition, due...