LCS Tool : A Computational Platform for Lagrangian Coherent Structures

We give an algorithmic introduction to Lagrangian coherent structures (LCSs) using a newly developed computational engine, LCS Tool. LCSs are most repelling, attracting and shearing material lines that form the centerpieces of observed tracer patterns in two-dimensional unsteady dynamical systems. LCS Tool implements the latest geodesic theory of LCSs for two-dimensional flows, uncovering key transport barriers in unsteady flow velocity data as explicit solutions of differential equations. After a review of the underlying theory, we explain the steps and numerical methods used by LCS Tool, and illustrate its capabilities on three unsteady fluid flow examples

Cellular Planning of GSM Network in Rivers State, Nigeria

Global system for mobile communication has witnessed tremendous growth. This is due largely to the fact that it enables people to make quality calls, send messages, browse the internet etc. at any time and for any period. The huge number of GSM subscribers has resulted in the system being over-loaded. This research work is aimed at optimizing Global System for Mobile Communication (GSM) network in Rivers State. The behavior of GSM network under four different conditions were examined. The work also aimed to determine the number of base stations required to provide adequate GSM network coverage in Rivers State. Erlang B technique was employed to achieve the aim of this research work. This research work found that when the traffic load is greater than, or too close to, the voice channels (in magnitude), the system denied many callers access from making calls. However, when the voice channels are greater than traffic load, the system performed well. But voice channels must not be far greater than traffic load and should not be too close to it, to avoid under-utilization or over-utilization of the channels. The work also revealed that the number of base stations required in any given place varies inversely proportional to the square of the cell radius. Hence, for Rivers State, the number of base stations to provide 100% network coverage for a cell radius of 3km was found to be 474

DANGERS ASSOCIATED WITH POLARITY REVERSAL ON DC APPLIANCES AND IT REMEDY

Direct current (DC) appliances have already become an important source used in many appliances across a wide range of generating alternative power supply. Reverse polarity has destroyed so many inverters, cause fire out breaks and so on. This work is mainly concerned with dangers associated with of polarity reversal on electronics appliances and how they can cheaply be prevented and protected as the case of an inverter. This is achieved by incorporating a load relay between the battery and the inverter and a diode in series with the relay coil terminal such that a unidirectional flow of dc source is allowed

Schlieren visualisation and measurement of axisymmetric disturbances

International audienceSynthetic schlieren is a new technique that allows one easily and inexpensively to visualise density variations, such as those caused by internal waves propagating in a density stratified fluid. In the special case of two-dimensional internal waves (for example, those created by an oscillating cylinder), synthetic schlieren allows one to measure non-intrusively the wave amplitudes everywhere in space and time. The technique works by measuring the apparent displacement of points in a digitised image (such as a grid of horizontal lines), which is observed by a CCD camera through the experimental test section. Synthetic schlieren is sufficiently sensitive that it can measure sub-pixel-scale disturbances. In this work, we report on the first step toward measuring fully three-dimensional disturbances. We perform laboratory experiments in which internal waves are generated in a uniformly salt-stratified fluid by a vertically oscillating sphere. Theory predicts that the resulting wave-field is in the form of two cones emanating above and below the sphere. Using inverse tomographic techniques, we exploit the axisymmetry of the wave-field to relate the apparent displacement of pixels in an image to the wave amplitudes

Effect of Information Technology Investment on Organisational Productivity and Growth of Small and Medium Scale Enterprises in Developing Countries: A Case of Sachet and Table Water Industries in Lagos State, Nigeria

The objective of this paper is to determine the effect of information technological investment on employee’s output performance. Subject for the study consisted of seventy employees of sachet and table water manufacturing industries, Lagos, Nigeria. Data for the study were collected through a well-structured questionnaire delivered to the workers of the sachet and table water companies. We used F test, T test, regression and correlation to test our hypotheses whether information technology usage in production processes , work environment and management style boost up  the output performance  of an employees. The findings of the study showed that there exist strong positive relationship and significant effect between aggregate output, technology usage, work environment, and management style and that the technological usage in production processes has the highest contribution to boost aggregate output performance of an employees in sachet and table water manufacturing companies. Keywords: Information Technology, Output, Performance, Manufacturing Companies, Work Environment, Management Style

DANGERS ASSOCIATED WITH POLARITY REVERSAL ON DC APPLIANCES AND IT REMEDY

Direct current (DC) appliances have already become an important source used in many appliances across a wide range of generating alternative power supply. Reverse polarity has destroyed so many inverters, cause fire out breaks and so on. This work is mainly concerned with dangers associated with of polarity reversal on electronics appliances and how they can cheaply be prevented and protected as the case of an inverter. This is achieved by incorporating a load relay between the battery and the inverter and a diode in series with the relay coil terminal such that a unidirectional flow of dc source is allowed

EXAMINING THE EFFECT OF NETWORKING ON ORGANIZATIONAL PERFORMANCE IN THE BANKING INDUSTRY: EVIDENCE FROM NIGERIA

This study was on the networking and organisational performance of deposit money banks in Nigeria. The purpose was to determine how networking capability influences organisational performance of deposit money banks in Nigeria. The design of the study was a survey and the population was 2,413 low, medium, and senior-level managers of five selected deposit money banks in Nigeria licensed by Central Bank of Nigeria (CBN) for commercial banking. The sample was 463 determined using Krejcie and Morgan (1970) formula in addition to an attrition rate of 40%. The study used the stratified proportionate random sampling technique. Primary data were collected using the structured validated questionnaire from the specified units of measurement with instruments assessed for reliability using the Cronbach alpha coefficient. Results demonstrated all constructs to be highly reliable, Cronbach’s alpha coefficients for the constructs ranged from 0.783 to 0.842. The response rate was 86.9%. Data collected were analyzed using multiple linear regression analysis. The finding revealed that networking through ATMs, branches, phones, and the Internet as introduced by Nigerian deposit money banks improved organisational performance (β = 0.139, t = 3.281, p < 0.05). The study recommended that It is also recommended that executive management should spend more on current technology and financial innovation. This will improve bank efficiency and cut expenses. Through financial innovations, the bank may expand its products and services, improving sales and bank performance.  Article visualizations

Learning domain-invariant classifiers for infant cry sounds

The issue of domain shift remains a problematic phenomenon in most real-world datasets and clinical audio is no exception. In this work, we study the nature of domain shift in a clinical database of infant cry sounds acquired across different geographies. We find that though the pitches of infant cries are similarly distributed regardless of the place of birth, other characteristics introduce peculiar biases into the data. We explore methodologies for mitigating the impact of domain shift in a model for identifying neurological injury from cry sounds. We adapt unsupervised domain adaptation methods from computer vision which learn an audio representation that is domain-invariant to hospitals and is task discriminative. We also propose a new approach, target noise injection (TNI), for unsupervised domain adaptation which requires neither labels nor training data from the target domain. Our best-performing model significantly improves target accuracy by 7.2%, without negatively affecting the source domain

Kinetics and Mechanism of the Oxidation of Orange II by Chlorate Ion in Aqueous Hydrochloric Acid

Communication in Physical Sciences 2020, 5(2):165-170 Authors: B. Myek, S. O. Idris, A. D. Onu and M. K. Yakubu Received 05 March 2020/Accepted 03 May 2020 The kinetics of the oxidation of orange II (OR-) by ClO3-was studied in aqueous hydrochloric acid where the ionic strength and other parameters of the reaction mixture was, I = 0.50 mol dm-3 (NaCl), [H+] = 5.0 10-2 mol dm-3 (HCl) and T = 21 +/_ 1o C. The redox reaction displayed a stoichiometry of 1:2 and obeys the rate law given as,−????[????????−]/???????? = ????[????][????????][???????????? ]. The observed second order rate constant was found to increases with increase in hydrogen ion concentration. The rates of reaction displayed a zero salt effect and was inhibited by some added cations and anions. From the Michaelis-Menton Buck plot, there was no evidence for the formation of intermediate during the course of the reaction. Based on the results obtained, the outersphere mechanism was proposed for the reaction.&nbsp

Assessment of Micro Flora, Deoxynivalenol (Don) and Fumonisin Contamination of Grains sold in Local Markets, Nigeria

Fusarium the major deoxynivalenol (DON) and fumonisin producing species of fungi grow as a corn endophyte often without causing disease symptoms in plant. Climate changes resulting in appropriate weather conditions helps in Fusarium growth causing seedling blight, stalk rot and ear rot. Thus most grain contamination of Fusarium comes from the farm. This study was carried out to assess the micro flora and level of DON and fumonisin contamination in Zea mays, Sorghum bicolor, Triticum aestivum and Pennisetum americanum sold in Ota. Forty samples comprising ten of each grain type was analyzed, Fumonisin at concentration ≥4.0 mg/kg (ppm) was detected in eight samples of Zea mays and two samples of Triticum aestivum while DON at concentrations ≥1.25mg/kg (ppm) was detected in all the wheat samples using the Rida® Quick Fumonisin and DON test kits. The total aerobic plate count for the samples ranged from 2.0×104 to 8.4×106 cfu/g, fungal count ranged from 1.0×104 to 6.0×106 cfu/g while coliform count ranged from < 10 to 2.0×103 cfu/g. The predominant microbial isolates from the grains included species of Fusarium, Aspergillus, Mucor, Penicillium, Bacillus, Klebsiella, and Pseudomonas. Infection of grains by fungal species and contamination with mycotoxins can generally be influenced by favourable weather conditions. Measures to address climate changes, effective hazard analysis and critical control point (HACCP) and good storage system are advocated to prevent mould contamination and deleterious mycotoxin production in grains