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Abstract

The ability of parasitoids in locating hosts determines their success in suppressing the pest population. Chemical stimuli emitted from food products and hosts provoke the searching behavior of parasitoids. Anisopteromalus calandrae (Howard) (Hymenoptera: Pteromalidae) is a generalist idiobiont ectoparasitoid of coleopteran pests in stored products. In the current study, the behavioral responses of A. calandrae females were evaluated regarding host food and different life stages of the host, Callosobruchus maculatus F. (Coleoptera: Chrysomelidae), using a Y-tube olfactometer. The parasitoid was offered uninfested chickpea kernels, damaged chickpea without larvae of C. maculatus, damaged chickpea with preferred stage (4th instar) larvae of C. maculatus, uninfested chickpea + C. maculatus adults, and eggs of C. maculatus on chickpea. In another test, the preference of A. calandrae for either damaged chickpea without larva of C. maculatus or damaged chickpea with nonpreferred stage (1st instar) larvae of C. maculatus was studied. The results showed that the females did not prefer uninfested chickpea kernels and adults of C. maculatus. However, they were attracted to damaged kernels with or without larvae, and the kernels containing eggs of C. maculatus. When the female parasitoids had a choice between damaged chickpea without larva of C. maculatus and damaged chickpea with 1st instar larva, they did not prefer one over the other. The results of this investigation can be helpful for using A. calandrae as a biological control agent in stored products.
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Authors and Affiliations

Masoomeh Moosavi
1
Nooshin Zandi-Sohani
1
Ali Rajabpour
1

  1. Plant Protection Department, Agricultural Sciences and Natural Resources University of Khuzestan, Ahvaz, Iran
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Abstract

In industrial processes electrical motors are serviced after a specific number of hours, even if there is a need for service. This led to the development of early fault diagnostic methods. Paper presents early fault diagnostic method of synchronous motor. This method uses acoustic signals generated by synchronous motor. Plan of study of acoustic signal of synchronous motor was proposed. Two conditions of synchronous motor were analyzed. Studies were carried out for methods of data processing: Line Spectral Frequencies and K-Nearest Neighbor classifier with Minkowski distance. Condition monitoring is useful to protect electric motors and mining equipment. In the future, these studies can be used in other electrical devices.

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Authors and Affiliations

Adam Glowacz
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Abstract

MIMO technology has become very popular in a wireless communication system because of the many advantages of multiple antennas at the transmitting end and receiving end. The main advantages of MIMO systems are higher data rate and higher reliability without the need of extra power and bandwidth. The MIMO system provides higher data rate by using spatial multiplexing technique and higher reliability by using diversity technique. The MIMO systems have not only advantages, but also have disadvantages. The main disadvantage of MIMO system is that the multiple antennas required extra high cost RF modules. The extra RF modules increase the cost of wireless communication systems. In this research, the antenna selection techniques are proposed to minimize the cost of MIMO systems. Furthermore, this research also presents techniques for antenna selection to enhance the capacity of channel in MIMO systems.

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Authors and Affiliations

Dalveer Kaur
Neeraj Kumar

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