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In this study, a chattering free sliding mode controller (SMC) is designed for the control of PLL based frequency synthesizers. Due to fast locking requirement of PLL based frequency synthesizers in frequency hopping spread spectrum communication and radar applications, a sliding mode control approach is demonstrated to be more suitable with its high gain property, over classical control methods....
Vapours of essential oils extracted from cumin, Cuminum cyminum L., anise, Pimpinella anisum L., oregano, Origanum syriacum var bevanii (Holmes) Ietswaart and eucalyptus, Eucalyptus camaldulensis Dehn., were found to be toxic to two greenhouse pests, viz. the carmine spider mite, Tetranychus cinnabarinus (Boisd.) (Tetranychidae, Tetranychini) and cotton aphid, Aphis gossypii Glov. (Aphididae, Aphidini)...
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