Effect of Performance of A DC Motor by Replacing Ferrite Magnet with Melt Spun NdFeB Magnet

Permanent magnets have been used in many applications and industries a long time ago since earlier 20th century. It has been used for consumer electronics, appliances and tools, factories automation and also for medical and educational purposes. Nowadays, peoples are coming with researches to produce permanent magnet with greater strength for heavy applications and also to reduce the volume of the magnet without compromising the magnetic properties. One of its applications is in Permanent Magnet DC Motor (PMDC motor). The author studied the effect of performance of a DC motor by replacing a ferrite magnet with the melt spun NdFeB Magnet. In this project the author fabricated a bonded NdFeB for a DC motor from NdFeB alloy powders which are produced from melt spinning process. The magnet is fabricated by using compression moulding technique and using epoxy as its binder. The fabricated magnet is then magnetised by using magnetizer. Besides, microstructure and chemical properties of the magnet is checked by using optical microscope and also Scanning Electron Microscopy (SEM) with chemical analysis. Magnetic properties of the magnet is also analysed by using Vibrating Sample Magnetometer (VSM). Physical properties of the magnet such as the density is also will be analysed. After all the work done, the DC motor speed increased for 38.3%. This result shows that by replacing ferrite magnet with bonded NdFeB magnet able to build a more efficient motor

On the Convergence of the Homotopy Analysis Method for Inner-Resonance of Tangent Nonlinear Cushioning Packaging System with Critical Components

Homotopy analysis method (HAM) is applied to obtain the approximate solution of inner-resonance of tangent cushioning packaging system based on critical components. The solution is obtained in the form of infinite series with components which can be easily calculated. Using a convergence-control parameter, the HAM utilizes a simple method to adjust and control the convergence region of the infinite series solution. The obtained results show that the HAM is a very accurate technique to obtain the approximate solution

Spousal Age Gap and Its Effects on Reproductive Health Decision Making Process in Nigeria

The paper explores Spousal age gap and its effects on Reproductive Health Decision Making Process in Nigeria using  Ankpa Local Government of Kogi State  as a unit of analysis.  Qualitative research was carried out using in-depth interviews. 20 couples were interviewed in Ankpa local government area of Kogi State and the findings revealed that age gap Narrow spousal communication and has  implication for the younger bride’s ability to communicate very well and freely in qualitative manner with her husband, age gap provide them with experience and resources, the wider the age gap the more the respect, if the woman is of the same age with the husband there is a tendency for disrespect and as women grow older chances that they will find husbands.The paper suggest, educating women as well as creation of jobs opportunities. Keywords: Age, Health, Reproductive, Rights    and Women

Cholera and household water treatment why communities do not treat water after a cholera outbreak: a case study in Limpopo Province

Background: Cholera is one of the common diseases in developing countries caused by consumption of contaminated and untreated drinking water. A study was conducted 7 months after a cholera outbreak in Vhembe district, Limpopo, South Africa. The aim of the study was to assess if the communities were still conforming to safe water practices after an outbreak of cholera. Methodology: One hundred and fifty-two (152) participants from 11 villages were recruited to form 21 focus groups, with a mean of 7. The interview transcripts were coded and arranged based on the study themes. Results: Of the 21 groups in 11 villages, three villages were using water from boreholes, six were using river water and three were using mixed sources which included river, canal and spring water, three depended on municipal tanks and only six were using tap water. Only 19% of the respondents treated their water, even though the majority of communities reported treatment of water as a priority. Four villages claimed they never received environmental health education at all, while most of the villages confirmed they received education during a cholera outbreak. Conclusion: Regardless of the outbreak and health education efforts done, communities continued using unprotected water sources without any form of treatment, as they perceived it to be unimportant. Sustainable water supplies and environmental health education should be continued after an outbreak as it is important for public health gains

Effect of Performance of A DC Motor by Replacing Ferrite Magnet with Melt Spun NdFeB Magnet

Permanent magnets have been used in many applications and industries a long time ago since earlier 20th century. It has been used for consumer electronics, appliances and tools, factories automation and also for medical and educational purposes. Nowadays, peoples are coming with researches to produce permanent magnet with greater strength for heavy applications and also to reduce the volume of the magnet without compromising the magnetic properties. One of its applications is in Permanent Magnet DC Motor (PMDC motor). The author studied the effect of performance of a DC motor by replacing a ferrite magnet with the melt spun NdFeB Magnet. In this project the author fabricated a bonded NdFeB for a DC motor from NdFeB alloy powders which are produced from melt spinning process. The magnet is fabricated by using compression moulding technique and using epoxy as its binder. The fabricated magnet is then magnetised by using magnetizer. Besides, microstructure and chemical properties of the magnet is checked by using optical microscope and also Scanning Electron Microscopy (SEM) with chemical analysis. Magnetic properties of the magnet is also analysed by using Vibrating Sample Magnetometer (VSM). Physical properties of the magnet such as the density is also will be analysed. After all the work done, the DC motor speed increased for 38.3%. This result shows that by replacing ferrite magnet with bonded NdFeB magnet able to build a more efficient motor

Emphysematous pyelonephritis

Emphysematous pyelonephritis is an acute necrotizing infection of the renal parenchyma, prompt diagnosis and early treatment is crucial because of the high rate of mortality. We report a case of a 55-year-old female patient with ten-year history of diabetes mellitus presented with pain in right flank, fever and malaise. She was diagnosed as a case of emphyse­matous pyelonephritis, and was successfully treated in our department. The case is presented along with a literature review

Development Of A River Water Quality Management Information System.

Rivers provide water for domestic consumption, agriculture, industry and recreation. Thus, to ensrue consistent high quality, river water quality should be monitored on a regular and systematic basis

The One Step Optimal Homotopy Analysis Method to Circular Porous Slider

An incompressible Newtonian fluid is forced through the porous of a circular slider which is moving laterally on a horizontal plan. In this paper, we introduce and apply the one step Optimal Homotopy Analysis Method one step OHAM to the problem of the circular porous slider where a fluid is injected through the porous bottom. The effects of mass injection and lateral velocity on the heat generated by viscous dissipation are investigated by solving the governing boundary layer equations using one step optimal homotopy technique. The approximate solution for the coupled nonlinear ordinary differential equations resulting from the momentum equation is obtained and discussed for different values of the Reynolds number of the velocity field. The solution obtained is also displayed graphically for various values of the Reynolds number and it is shown that the one step OHAM is capable of finding the approximate solution of circular porous slider

Synthesis, spectral characterization and crystal structure of a novel trinuclear di-n-butyltin(IV) complex with pyruvic acid-N(4)-cyclohexylthiosemicarbazone (H2PACT)

A new trinuclear di-n-butyltin(IV) complex with pyruvic acid-N(4)-cyclohexylthiosemicarbazone (H2PACT) ligand was synthesized and characterized by elemental analyses, molar conductivity, UVeVis, FT-IR, 1H, 119Sn NMR spectroscopy and single crystal X-ray study. Single crystal X-ray diffraction data revealed that this complex was trinuclear cyclic fashion with the pyruvic acid-N(4)-cyclohexylthiosemicarbazone ligand. In the trinuclear di-n-butyltin(IV) complex, the ligand (H2PACT) is coordinated to the central tin(IV) atoms via the carboxylato-O, the azomethine-N and the thiolato-S atoms. The trinuclear tin system is formed by the bridges through the carbonyl oxygen atom of the carboxylate moieties and making the tin atom of seven coordinated in distorted pentagonal bipyramidal geometry. Single crystal X-ray data indicates that the complex (1) crystallized in cubic system with space group I-43d, a ¼ b ¼ c ¼ 30.3273(17) Å, a ¼ b ¼ g ¼ 90�, Z ¼ 16, m(MoKa) ¼ 1.209 mm�1, F(000) ¼ 12,144, and final R1 ¼ 0.0390, wR2 ¼ 0.0843 for observed reflections 4582(I > 2s(I))