background: essential oils, as secondary plant compounds, present a safer alternative to conventional insecticides in insect control programs. so five essential oils including eucalyptus, mint, yarrow, oregano and rosemary oils were evaluated against the brown-banded cockroach supella longipalpa . methods : evaluation was done against the 3 rd and 4 th instar nymphs using three bioassay methods...

The application of Micro Electro Mechnical Switch (MEMS) technology to Electronically Scanned Arrays (ESAs) provides the potential for significantly reducing the volume, weight, cost, and power consumption of antennas for both radar and communications systems. This paper addresses the current and projected status of Radio Frequency (RF) MEMS technology and assesses the potential benefits of MEM...

Certain postulates are posited as a basis for the orientation and organization of research in mechanical translation. They are the following: 1. The essential problem of mechanical translation is the establishment of acceptable correlation between the signs of one system (the source language) and those of another (the target language). 2. The signs of natural language, unlike the symbols of suc...

According to the spring’s failures in the tools storage and mechnical tools locking, the thesis will discuss the reliability optimization design for spring. With the known probability characteristics of basic random parameters, the random perturbation method, the reliability theory and optimal design technology are used to give the spring reliability design problems in locking knife spring in t...