Bidirectional Synchronization of Two Identical Jerk Oscillators with Memristor

In this paper, the case of introducing memristor as a coupling component when synchronizing two identical simple chaotic oscillator (3-D Jerk equations) were observed. Also, the numerical simulation of the phase portraits are in good agreement with the MultiSIM and experimental simulations. Due to the complex chaotic dynamics of this oscillator, the realization of the electronic circuit involving two identical Jerk oscillator with memristor as coupling component were synchronized via bidirectional coupling and further applied to secure communication

Exploring STEM Kit Diagrams for braille readers in inclusive classrooms

Diagrams appears in many school subjects but more prominent in science and mathematics taught in schools. Accessing these diagrams in an inclusive classroom has been identified to be problematic for blind students partly due to the teaching resources available and personnel type, support and sufficiency. Diagrams are mostly omitted by teachers leaving the blind person out in such classroom to access portion of education received by their peers. In many instances, questions with diagrams are treated as bonus for blind students in some countries which is not fair to them. This study explored the efficacy of STEM Kit diagrams on participation and inclusion of blind students in science lessons in two case schools in Nigeria. Data were collected through classroom observations and teacher and student interviews. The accessible diagrams in the STEM Kit were found to provide relevant solutions to problems militating against adequate accessibility of diagrams to blind students in inclusive classrooms

Impacts of latency on throughput of a corporate computer network

This paper addressed the impacts of latency on good throughputs of a computer network. The networks latency contributed largely on the performance of Covenant University network. Experiment using the University network were carried out with the channel capacity, the file sizes with the distance varies to suit the performed experiment. The Mathlab/Simulink and Netcracker Professional systems were used to simulate the model network, throughput and latency. The results from simulated hypothetical corporate computer network were validated and compared to those obtained from some websites traffic, which indicated the impact of latency on good throughput of a corporate computer network decreases the efficiency of data exchange with increase in the number of users. Thus, poor data exchange in a network with constant and good throughput was better resolved through detailed knowledge of the latency

Some Physical Characteristics of Microcrystalline Cellulose Obtained from Raw Cotton of Cochlospermum planchonii

Purpose: The microcrystalline cellulose is an important ingredient in pharmaceutical, food, cosmetic and other industries. This study aimed at evaluating the physical characteristics of microcrystalline cellulose (CP-MCC), obtained from the raw cotton of Cochlospermum planchonii. Methods: CP-MCC was obtained from the raw cotton by a two-stage sodium hydroxide treatment process followed by sodium hypochlorite bleaching and acid hydrolysis. It was examined for its physicochemical and powder properties. The powder properties of CP-MCC were compared to those of the well-known commercial microcrystalline cellulose grade, Avicel PH 101. Results: The extraction yield of CP-MCC was approximately 21%. The cellulose material was composed of irregularly shaped fibrous cellulose particles with a moisture content of 7.2% and total ash of 0.12%. The true density was 1.38. The flow indices showed that CP-MCC has poor flow. The hydration, swelling and moisture sorption capacities were 4.7, 83.3 and 22%, respectively. Conclusion: The cellulose product, CP-MCC, obtained from the raw cotton of Cochlospermum planchonii conformed to the official specifications in the British Pharmacopoeia (2004). The flow properties of a powder are critical in direct compression tableting; consequently, for the materials to be used for this purpose, it would require the addition of a glidant. Furthermore, the swelling parameters indicate that CP-MCC would be a better disintegrant than Avicel PH 101. Keywords: Cochlospermum planchonii, microcrystalline cellulose, physical characteristics, pharmacopoeial requirements> Tropical Journal of Pharmaceutical Research Vol. 4 (2) 2005: pp. 501-50

Fan Speed Control of Processor Based On Environmental Temperature

Temperature is a physical property that is an essential part of life and Maintaining control of it is of paramount importance to man. Temperature is measured with various types of measuring instruments. But beyond the need to measure temperature, it must also be controlled and monitored. In an industrial setting with heavy equipment that need a round the clock cooling system so as to perform optimally without breakdown, it is important to have a mechanism that monitors the temperature situation, one that can detect the slightest threat to the condition of the systems as regards temperature change. Also temperature control can be used in personal computers to prevent overheating of the processor. This work involves sensing the temperature level of an environment and if a temperature out of range is detected, the fan speed increases to maximum. W hen the temperature drops below a threshold again, the fans are turned back off. The circuit is designed using a temperature sensor that is a thermistor. The temperature transducer is used to sense the temperature of the environment at that point in time and an indication shown on an LED

Prevalence of food sensitization and helminth infection among primary school children in Ibadan, southwest Nigeria

Background: Food allergy is a problem of the western world, however, cases of food allergy have also been found in developing countries. In Nigeria, the prevalence of food allergy is scarce while the association of food sensitization with helminthiasis is unknown. Objective: This study was designed to determine the prevalence of sensitization to food among Nigerian school children and its relation to intestinal helminthiasis. Methods: A total of 128 participants were recruited from CAC Primary School, Sango, Ibadan, Nigeria. Skin Prick Test using freshly prepared food allergens was carried out. Stool samples were collected from them to screen for ova of parasites using concentration method. Results: A total of 26 (20.3%) out of 128 participants were SPT positive for various food allergens, while 16 (12.5%) had helminthic infection. There was however an equal distribution of helminthic infection among students who were food allergen SPT positive and negative. There was also no association between gender and susceptibility to food allergy. Conclusion: Sensitization to food is common in school children, and intestinal helminthiasis seems to have no influence on its prevalence.Keywords: MPO, inflammatory response, neonates, sepsis

Development Of An SMS Based Alert Systemusing Object Oriented Design Concept

An automated lecture alert management system has been developed using java programming concept knownfor its portability. This backend system was interfaced with the GSM network through USB port of a PC and GSM modem. The desktop SMS application was developed using C# programming language. It generates updates and reminder from a time schedule stored in a database thereby making the system a time triggered application

Electronic Simulation and Hardware Implementation of Two Coupled Periodically Forced Duffing and Van der Pol oscillators and its Application to Secure Communication

Confirmation of the existence of complex behavior and synchronization of non-identical chaotic systems as reported in literature attracts much interest in secure communication, but practical implementation is still challenging. In this work, the dynamics of coupled non-identical circuits comprising periodically forced Duffing and Van der Pol oscillators is investigated via electronic simulation using Multism software and hardware implementation on electronic circuits board. After complete synchronization is achieved between the Duffing (Transmitter) and Van der Pol (receiver) circuits through the variation of the coupling resistor of the controller, its application to secure communication is therefore demonstrated experimentally and via multism. The results from the electronic simulation and hardware implementation on bread board using analog components are in good agreement with the numerical results in literature

Phosphoric Acid-Mediated Depolymerization and Decrystallization of α-Cellulose Obtained from Corn Cob: Preparation of Low Crystallinity Cellulose and Some Physicochemical Properties

Purpose: Low crystallinity celluloses (LCC) are materials that have a substantially reduced degree of crystallinity, typically ranging between 15 and 45%. It is useful as an excipient in preparation of tablets and confectionery products. The aim of this work was to obtain from α-cellulose content of corn cob, a low crystallinity cellulose (LCC-CC), and study its physical properties as well as evaluation of its potential as tablet excipient. Methods: α- cellulose (AC-CC) obtained from corn cob by a delignification process, was depolymerized with 85% phosphoric acid to yield LCC-CC product, whose physical properties were compared with those of AC-CC. Results: The yield of AC-CC and LCC-CC were 14 and 11 %, respectively. The physical properties indicated a good level of purity of the cellulose materials as they conform to British Pharmacopoeia specifications. The flow indices, however, showed that these materials flowed poorly. Conclusion: It was concluded that LCC-CC is a potential disintegrant and filler-diluent, in pharmaceutical tableting. Keywords: Low crystallinity cellulose, α-cellulose, physical properties, corn cob. > Tropical Journal of Pharmaceutical Research Vol. 4 (2) 2005: pp. 509-51

Cost Entropy and Expert System Approach to Modeling Cost Smoothing System in Reinforced Concrete Office Building Projects Procurement

The main aim of this research work is to develop an expert system approach to cost smoothing model in reinforced concrete office building project procurement. An econometric model which incorporates exigency escalator and inflation buffer, with entropy threshold for a typical reinforced concrete office building, useful at tendering and construction stages of building projects was developed in this study. As built and bill of quantity value of twenty (20) building projects initiated and completed within 2008 and 2009 were used at random. Elemental dichotomies within the context of early and late constructible elements with speculated prediction period was used, taken into consideration the present value of cost. This attributes would enable a builder or contactor load cost implication of an unseen circumstance even on occasion of deferred cost reimbursement with the aid of average entropy index developed for each project elements. The model was further validated with new samples and discovered to be of high Eigen and contingency coefficient values. The model could help in cost smoothing at different stages of reinforced concrete office building which could further aid cost overrun prevention