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resume samples on welding

Prevalence of HBV and HIV among students and staff at  the University of Jos, Nigeria: Results from

Human immunodeficiency (HIV) and hepatitis B virus (HBV) are both of great concern in Nigeria. This study was conducted to understand the HIV and HBV prevalence among students and staff at the University of Jos (Jos, Nigeria) through a medical outreach program in which free screening was offered to voluntary participants at the university. Serum samples from 180 individuals were assayed for the presence of HBV surface antigen, HIV-1 p24 antigen, and HIV-1/2 antibodies. HIV prevalence was 3.88% and HBV prevalence was 7.22%. In sum, the prevalence of HBV and HIV among young Nigerian adults reflects the need for establishment of clear health policy for this risk group.

Estimation of Caffeine in Different Brands of Soft Drinks  by Ultraviolet Spectroscopy

this study was undertaken for the purpose to determine the concentration of caffeine in eight brands of soft drinks with the use of an Ultraviolet spectroscopy. This told us about the best brand among the different brands containing caffeine. The highest concentration of caffeine was found in Sting 500mL (560.29 µg/mL), so it is strongest CNS (central nervous system) stimulant among all samples and it is harmful for health. The lowest concentration of caffeine was found in 7up 500mL (29.71 µg/mL). So it is a weakest stimulant among all samples and can be sold in market

Effect of some factors on lipase production by Bacillus  cereus isolated from diesel fuel polluted s

Optimization the production of extracellular lipase in culture of Bacillus cereus has been investigated. From 10 samples of diesel fuel polluted soil it was found that 3 samples was positive for the presence of B. cereus. Lipase production by B. cereus isolated from diesel fuel polluted soil was investigated and optimized. The enzyme production was increased with increasing time and maximum enzyme activity was obtained after 72 hrs of incubation. Effect of pH and temperature indicated that, the lipase production was maximum at pH 8.0 (60.2 U/ml) and at 35°C (55.25 U/ml). The lipase production was optimized in shake flask experiments. With a selected carbon sources, maltose (65.5 U/mL) and nitrogen source, peptone (66.25 U/mL) was suitable substrates for accelerating lipase production. The present study indicates that the various factors influenced enzyme production by the bacteria, it appears that the nature of the supplements had significantly influenced on the produc

Effect of Force Control during Spot Welding on Weld  Properties

Resistance Spot Welding (RSW) is a process that is widely used in the automotive industries. The parameters that are used to develop a spot weld are the welding current, weld time and electrode force. Electrode force was not used as a control parameter due to the use of pneumatic system to actuate the welding electrode. The pneumatic system does not allow the development of closed loop control system; therefore electrode force was not used to control the growth of the spot weld nugget. This reported work looks into the ability to control electrode force dynamically during welding by using servomechanism. Force profiles were introduced in this work and the electrode force during welding was controlled to follow these force profiles. Based on the findings, the developed controller was able to control the electrode force during welding to follow the given force profiles. Decreasing the electrode force during welding facilitates the initiation of spot weld growth earlier in

Effect of Force Control during Spot Welding on Weld  Properties

Resistance Spot Welding (RSW) is a process that is widely used in the automotive industries. The parameters that are used to develop a spot weld are the welding current, weld time and electrode force. Electrode force was not used as a control parameter due to the use of pneumatic system to actuate the welding electrode. The pneumatic system does not allow the development of closed loop control system; therefore electrode force was not used to control the growth of the spot weld nugget. This reported work looks into the ability to control electrode force dynamically during welding by using servomechanism. Force profiles were introduced in this work and the electrode force during welding was controlled to follow these force profiles. Based on the findings, the developed controller was able to control the electrode force during welding to follow the given force profiles. Decreasing the electrode force during welding facilitates the initiation of spot weld growth

Determination  of  Cd,  Hg,  As,  Cr  and  Pb levels  in  meat  from the  Kumasi  Central  Abattoir

The purpose of this study was to determine the concentrations of toxic metals (Cd, Hg, Cr, Pb, As) in meat at the Kumasi Central Abattoir, Ghana by using a Varian 220 Atom Absorption Spectrophotometer. The levels of toxic metals in meat (cow, pig, sheep, goat, grass cutter, deer) varied in concentration. The concentration of lead was above the tolerance level in all the meat samples with the highest concentration recorded in beef at 1.154 mg/kg and the lowest at 0.037 mg/kg in pork. The amount of mercury, Hg observed in the various meat samples fell within the range of 0.059 mg/kg to 0.012 mg/kg, a little over the tolerable level of 0.05 mg/kg. The highest mercury, Hg concentration was observed in grasscutter meat (0.071 mg/kg) and the lowest concentration in pork, which was observed at 0.012 mg/kg, with the former above the permissible limit and

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Variability of pollutant build-up parameters in different  land uses of Guwahati City, Assam, India

Urban stormwater runoff carries pollutants that collect on impervious surfaces such as oil, dirt, chemicals, and lawn fertilizers directly to receiving water bodies (surface water, seepage water and ground water), where they seriously harm water quality. This study investigated the variability of pollutant build-up parameters in five different land use types. For this purpose stormwater samples were collected from five different land use types; residential, commercial, recreational, heavy traffic and industrial, around Guwahati city, Assam (India) and analysed to measure different build-up parameter. It was found that distribution of stormwater pollutants is highly influenced by the surrounding land use type. Coefficient of variation (CV) is derived for each of the selected build-up parameters for the different land uses. Industrial land uses showed relatively higher values of CV, indicating the highly variable nature of the pollutant build-up parameters within the sa

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