We consider a replacement problem of n units parallel system, where a component failure is rectified by minimal repairs. We exchanged the system preventively before failure if the number of minimal repairs reaches m r m m − − − ,..., 2, 1 and is preventively replace if the sum of minimal repair reaches threshold value m . Keywords: minimal repairs, parallel system, failure,
Artesunate (AS) plus amodiaquine (AQ) combination is a potent artemisinin-base antimalrial drug is commercially available with different trade names. Several adverse effects including neurotoxic complaints have been ascribed to this combination. This study was to determine the behavioral pattern of rats treated with this drug in an open field. Forty matured male Wistar rats weighing 150-180g were equally grouped into four. Group A was the control and the animals received tap water placebo, while groups B, C and D were the experimental.
A simple and rapid titrimetric method (Back Titration) was used in the assay of Sulphadimidine in commercial tablets. The method involves alkaline hydrolysis of Sulphadimidine to form the corresponding acid. This was followed by back titration of the excess alkali using phenolphthalein as indicator. The results of this assay method were compared with those obtained from the official nitrite titration method. Both methods yielded similar results with high percentage recoveries. The proposed method gave results that agree well with the labeled contents.
This paper addresses the problem of reliability improvement of k -out of - n system. It first looks at how series system is improved through the improvement of individual components with most reliable components.
Some larval fish species do not swim continuously but forage using intermittent locomotion pattern which consist of relatively high speed swimming interspersed by pauses. This type of locomotion is known as pause-travel. In this paper, a mathematical model that examines the advantages of pause-travel over continuous swimming is developed. The results of the present calculations show that pause-travel is an efficient strategy to adopt over certain range of travel speeds.
Although there is increased global concern on sustainable environmental and human health management, the African countries are still unserious which should not be the case considering the potential consequences of harmful chemicals discharge into our environment from domestic and other anthropogenic activities. We are therefore reporting in this paper a spectroscopic assessment of heavy metals in wastewater generated from students’ halls of Usmanu Danfodiyo University Sokoto, Nigeria.
Lipoxygenase (Linoleate: oxygen oxidoreductase EC.1. 13. 11. 12), a dioxygenase catalyzing the hydroperoxidation of fatty acids containing a cis,cis- 1,4-pentadiene structure was isolated from defatted whole and dehulled seeds of Luffa aegyptiaca ,a local plant found growing wildly in waste lands and rubbish dumps. Several properties of the enzyme including effect of pH, substrate concentration and heat treatment were investigated and lipoxygenase activity was determined spectrophotometrically at 234nm.
A field survey was conducted at Jere local government area of Borno state (longitude 110 571N and Latitude 130 951E). The main objective of the study is to investigate the socio-economic factors affecting the adoption of integrated weed management. The cost and return analysis shows high profit that an average of N118.133.50, N25, 725.53 and N92, 406.2 were respectively recorded as total revenue, total variable cost and gross margin by the respondents.
Information is a key resource for agriculture and rural development. Communication of information is a major function of extension aimed at the promotion of Agricultural development. This study is aimed at determining the influence of information communication technologies in dissemination of information to urban farmers in Maiduguri Metropolitan Council (MMC) of Borno State, Nigeria. Primary data for the study was obtained by administering questionnaire to the farmers through random sample of 60 respondents and 10 extension agents from 6 out of 15 wards of the MMC.
The quality of ground water in some selected land fill sites within Kano metropolis were assessed during the wet season for pH, turbidity, conductivity, total solids (TS) suspended solids (SS), total dissolved solids (TDS), Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Dissolved oxygen (DO), chloride, sulphate nitrate, phosphate, Zinc, Lead, Nickel, Cadmium, Iron, Manganese, Copper, and chromium. The analysis revealed that some samples were acidic and some alkaline with a pH range of (6.80 – 7.75) and at the methogenic stage.
