IOSR-JESTFT   Volume-3 ~ Issue-2 ~ Jan–Feb 2013

Abstract: Hardware complexity of a motor drive can be reduced by estimating controls rather than measuring using sensors. In this way the corresponding sensors are eliminated and the system becomes more robust. This article is about speed control of a sensor less induction motor with predictive current controller technique. This particular speed control technique does not require direct measurements of motor speed or motor flux. The PCC is based on a closed loop observer, which is insensitive to parameter variations. This closed loop observer calculates the required state variables over wide frequency range. This technique is more reliable even at very low frequency due to its insensitive nature against changes of motor parameters. It is proved that the drive system is applicable to the high dynamic performance and wide range of rotor speed. The obtained simulation results confirm the good properties of the proposed speed sensor less induction motor drive.

Keywords- predictive current control, closed loop observer, sensorless induction motor.

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Abstract: Water is life. This simple statement embodies the central role water plays to individuals, families, communities, nations and regions. The study was carried out for the bacteriological quality assessment of drinking water and identifies the problems related to water quality, impact of the microbiological quality of water from house hold sources (hand pumps) on public health indicators. The scope of work is limited to private water sources and their specific microbiological quality in three union councils of Nowshera including Tarrujabba, AmanKot and Akbar Purra. With a little variance in percentage of Other acute Diarrhea reported from the BHUs in these union councils it is concluded that Bacteriological contamination of the water sources has significant impact on the public health in these union councils, causing huge number of water born morbidities and posing continuous threat to develop in to potential water born disease alerts and outbreaks.

Key Words: Bacteria, Diarrhea, Disease, House Hold, Water sources.

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Abstract: Utilization of plant extracts in pest management is a cheap, environmentally friendly alternative to chemical pesticides. This study was designed to investigate the effects of aqueous extracts of Piper guineensis, Allium sativum and Myristica fragrans on field insect pest damage to leaves of cowpea, prior to flowering. Ife brown cowpea seeds were cultivated on beds assigned to four treatment groups (including a control), in a completely randomized design. 200g/litre of each plant material was used to prepare the stock solution. Field application of extracts was done in the evenings, thrice a week for two months, and data on leaf parameters was collected monthly. Analysis of variance revealed significant differences between the treatment groups at 5% probability level. Only Piper guineensis treated cowpea plants had significantly higher total number of leaves and total leaf area than the control, as well as significantly lower number of damaged leaves, percentage leaf damage, and damaged leaf area, in both months. Piper guineensis was more effective in controlling insect pest damage to leaves of cowpea than Allium sativum and Myristica fragrans.

Key words: Leaf damage, Cowpea, Piper guineensis, Allium sativum, Myristica fragrans..

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Abstract: Spermatotoxicity of aqueous leaf extract of guava (P. guajava) was accessed on the weight of testes and epididymes, sperm parameters and fertility in albino rat as a model. The male rats were divided into four groups of six rats each. The rats were administered with guava leaf extract at 0, 100, 200 and 300 mg/kg BW respectively for 70 days. The results showed dose-dependent significant (P<0.01) increases in weight of testes and epididymes, sperm count, sperm motility and sperm viability. Dose-dependent increases were also observed in conception rate of female rats sired by treated male rats from 41.67 to 83.33%, as well as the number of offspring from 17 to 42 respectively. The profound positive effects of aqueous leaf extract of guava on sperm parameters amongst others are not indications of spermatotoxicity.

Key words: Guava, toxicity, sperm parameters, conception rate, fertility,

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