Develop Job Finder Portal

The Internet has dramatically changed the ways both employees and employers think about job opportunities. The major benefits of Careers Online is the ability to reach a large number of job seekers at low costs, resumes can be checked and matches made more quickly. This study focused on development of a job search portal, a poor link between job portals frustrates job seekers in their job search and this project aimed at developing an easy to use portal. The applied design software engineering methodology was adopted and the job Finder was made of a simple design, high quality graphics and basic functionality and easy to use by users. The result from the development of the prototype portal was also discussed using screenshots from the prototype that was developed

A Study and Estimation a Lost Person Behavior in Crowded Areas Using Accelerometer Data from Smartphones

As smartphones become more popular, applications are being developed with new and innovative ways to solve problems in the day-to-day lives of users. One area of smartphone technology that has been developed in recent years is human activity recognition (HAR). This technology uses various sensors that are built into the smartphone to sense a person\u27s activity in real time. Applications that incorporate HAR can be used to track a person\u27s movements and are very useful in areas such as health care. We use this type of motion sensing technology, specifically, using data collected from the accelerometer sensor. The purpose of this study is to study and estimate the person who may become lost in a crowded area. The application is capable of estimating the movements of people in a crowded area, and whether or not the person is lost in a crowded area based on his/her movements as detected by the smartphone. This will be a great benefit to anyone interested in crowd management strategies. In this paper, we review related literature and research that has given us the basis for our own research. We also detail research on lost person behavior. We looked at the typical movements a person will likely make when he/she is lost and used these movements to indicate lost person behavior. We then evaluate and describe the creation of the application, all of its components, and the testing process

Modeling Of Structural And Environmental Effects On Microelectromechanical (Mems) Vibratory Gyroscopes

In this paper we investigate the effects of stiffness, damping and temperature on the performance of a MEMS vibratory gyroscope. The stiffness and damping parameters are chosen because they can be appropriately designed to synchronize the drive and sense mode resonance to enhance the sensitivity and stability of MEMS gyroscope. Our results show that increasing the drive axis stiffness by 50% reduces the sense mode amplitude by ~27% and augments the resonance frequency by ~21%. The stiffness and damping are mildly sensitive to typical variations in operating temperature. The stiffness increases by 1.25%, while the damping decreases by 3.81%, when the temperature is raised from 0C to 45C. Doubling the damping reduces the oscillation amplitude by 80%, but ~1% change in the frequency. The predicted effects of stiffness, damping and temperature can be utilized to design a gyroscope for the desired operating condition

Spectroscopy and control of ultrafast energy dynamics in natural light-harvesting complexes

Coherent control and transient absorption spectroscopy techniques have been used widely in biophysics to manipulate and study ultrafast molecular dynamics such as excitation energy transfer, internal conversion and photoprotection mechanisms. In this thesis, we investigate how excitation energy transfer pathways originating from the S2 state of carotenoids in the light-harvesting complex of plants and green algae can be manipulated through coherent control; moreover, we investigate energy dissipation mechanisms in the nonameric fucoxanthinchlorophyll- a,c-binding protein of the centric diatom Cyclotella meneghiniana, using the transient absorption spectroscopy technique. By manipulating the temporal amplitude and phase of the excitation pulse (through the use of blind phase functions on a spatial light modulator) we were able to optimize the energy transfer channel over the internal conversion channel by a factor of 24% compared to the initial pulse. The optimized pulse exhibited a shape that consists of 7 sub-pulses with a separation time of 178 fs between every two consecutive sub-pulses, and a FWHMof 92 fs for each sub-pulse. We propose that the main mechanism responsible for the optimization is the enhancement of specific vibrational modes via impulsive stimulated Raman scattering in order to facilitate energy transfer. In order to investigate the energy dissipation mechanisms in the nonameric fucoxanthinchlorophyll- a,c-binding protein FCPb of the centric diatom Cyclotella meneghiniana, we performed transient absorption (pump-probe) spectroscopy on this complex. FCPb complexes in their unquenched state were compared with those in two types of quenching environments, namely aggregation induced quenching by detergent removal, and clustering via incorporation into liposomes. Through the application of global and target analysis, in combination with a fluorescence lifetime study and annihilation calculations, we were able to resolve two quenching channels for FCPb in both quenching environments. Both quenching channels involve chlorophyll-a pigments. The faster quenching channel operates on a timescale of tens of picoseconds and exhibits similar spectral signatures as the unquenched state. The slower quenching channel operates on a timescale of tens to hundreds of picoseconds, depending on the degree of quenching, and is characterized by enhanced population of low-energy states between 680 and 710 nm. These results indicate that FCPb is, in principle, able to function as a dissipater of excess energy and can do this in vitro even more efficiently than the homologous FCPa complex, which is the only complex involved in fast photoprotection in these organisms. This indicates that when a complex displays photoprotection-related spectral signatures in vitro it does not imply that the complex participates in photoprotection in vivo. We suggest that FCPa is favored over FCPb as the sole energy-regulating complex in diatoms because its composition can more easily establish the balance between light-harvesting and quenching required for efficient photoprotection.Thesis (PhD)--University of Pretoria, 2018.PhysicsPhDUnrestricte

NMR studies of tin hydrides

The proton magnetic resonance spectra of various organo tin hydrides have been studied. Spectra were normally run under conditions of high scale expansion (0.2 Hz or 0.4 Hz cm ) and numerous heteronuclear double resonance experiments performed. The values of chemical shifts and coupling constants were compared with previously reported data. Proton spectra of di-cyclohexyl tin hydride and di-benzyl tin hydride have been reported for the first time. Some of the hydrides were deuterated [(CH3)2SnH2, (C6H5)2SnH2, C6H5H3 and (C6H5CH2SnH2] and the effects of deuterium substitution both on shielding and on spin spin coupling constants have been measured. Sn spectra at 22.37 MHz were obtained by the pulse FT method and values for 119 Sn chemical shift and tin-proton and tin-deuterium coupling constants obtained. Isotopic effects were observed both on shifts and coupling constants as a result of deuterium substitution. A linear dependence for Sn shifts on the number of substituents in methyl and phenyl stannanes has been found. The spin-lattice relaxation times (T1) of the naturally abundant magnetic tin satellites in the proton spectra of these hydrides have been measured and were found to be shorter than the relaxation times of the central feature resulting from molecules containing non-magnetic tin. Correlation times were calculated from the dipolar contribution to the total relaxation time. The temperature dependence of C spin-lattice relaxation time in di-methyl tin hydride has also been studied. The dipole dipole contribution was determined by measurement of the proton nuclear Overhauser enhancement of the methyl carbon. A computer program has been used for the iterative curve fitting of the experimental spectra of deuterated di-phenyl tin hydride to determine the quadrupole relaxation time (Tq) of the deuterium nucleus.<p

Design and Performance of LTE 3GPP Baseband Transceiver Based Wavelet Signals for Different Channel Estimation Algorithms

Long Term Evolution (LTE) 3GPP advanced is a mobile communication standard. It was formally submitted as a candidate 4G system. This paper refers to channel estimation based on time-domain channel statistics. Using a general model for Stanford University Interim (SUI) channel models, the aim of the paper is to find out the most suitable channel estimation algorithms for the modified Long Term Evolution (LTE) 3GPP baseband transceiver based wavelet signals and improvement the bit error rate for this system. Starting with the analysis of channel estimation algorithms, we present the Minimum Mean Square Error (MMSE (and Least Square (LS (estimators and compromising between performances under different channel scenarios. The bit error rate for a 16-QAM and OFDM system based wavelet signals is presented by methods of Matlab simulation results. Keywords: LTE 3GPP, DWT, SUI, OFDM, MMSE, LS, 16-QAM

The Preparation of some New Mannich and Shiff bases derived from 2-Mercaptobenzimidazole

The present work involved two steps: the first step include Mannich reaction was carried out on 2- mercaptobenzimidazole using formaldehyde and different secondary amine or amide to gives the compounds(2-16). The secnd step include preparation of (Ethylbenzimidazoly-2-mercaptoacetate)(17) from the reaction of 2- mercaptobenzimidazole with ethylchloroacetate than prepared hydrazide derivative[18]from reaction of compound(17) with hydrazinehydrate. Followed Preparation of shiff bases(19-24) and there reaction with mercaptoacetic acid to give a new compounds containing thiazolidinderivetives(25-30).Structure confirmation of all prepared compound were proved using FTIR and element analysis (C.H.N.S) and mesurmentedmelting point

Development of a Hybrid Algorithm for efficient Task Scheduling in Cloud Computing environment using Artificial Intelligence

Cloud computing is developing as a platform for next generation systems where users can pay as they use facilities of cloud computing like any other utilities. Cloud environment involves a set of virtual machines, which share the same computation facility and storage. Due to rapid rise in demand for cloud computing services several algorithms are being developed and experimented by the researchers in order to enhance the task scheduling process of the machines thereby offering optimal solution to the users by which the users can process the maximum number of tasks through minimal utilization of the resources. Task scheduling denotes a set of policies to regulate the task processed by a system. Virtual machine scheduling is essential for effective operations in distributed environment. The aim of this paper is to achieve efficient task scheduling of virtual machines, this study proposes a hybrid algorithm through integrating two prominent heuristic algorithms namely the BAT Algorithm and the Ant Colony Optimization (ACO) algorithm in order to optimize the virtual machine scheduling process. The performance evaluation of the three algorithms (BAT, ACO and Hybrid) reveal that the hybrid algorithm performs better when compared with that of the other two algorithms

Comparison of Accuracy in Determining the Root Canal Working Length by Using Two Generations of Apex Locators – An In Vitro Study

AIM: The present in-vitro study aims to compare the accuracy of root canal working length determination between the third generation and fourth generation electronic apex locators. MATERIAL AND METHODS: Fifty extracted single-rooted single canal teeth were selected for the study, and a definite coronal plane was prepared. Actual working length (AL) was measured using a stereomicroscope under 8X magnification. Electronic working length measurements were recorded using Root ZX (EL1) and Elements Diagnostic Unit (EL2) apex locators. One-way ANOVA test was carried out to analyse the data among the experimental groups. RESULTS: The results of the one-way ANOVA test showed that difference in the working length determined by either apex locators (EL1 and EL2) and actual length determined under a stereomicroscope (AL) was statistically not significant. The independent ‘t’ test comparing between groups EL1 and AL; and EL2 and AL showed that working length determined by either of the apex locators (EL1 and EL2) and actual length determined under a stereomicroscope (AL) was statistically not significant. CONCLUSION: In this in vitro study, the Root ZX and Elements Diagnostic Unit apex locators are equally accurate for determination of working length when compared to actual working length