Open Access Short Research Article

Simulation of Vibration Resistance and the Ways for Its Improvement on Designing Multistage Constructions

Aleksandr Shayko-Shaykovky, Aleksandr Bogorosh, Algimantas Bubulis, Nikolaj Visniakov, Andzela Sesok

Current Journal of Applied Science and Technology, Page 1-6
DOI: 10.9734/BJAST/2015/17790

The paper considers the possibility of a theoretical definition of the natural frequencies of vibrations of thermoelectric coolers with a different number of stages and different configurations in the design phase. Determination of natural frequencies of vibrations in parallel was carried out for products, taking into account the damping produced by a number of structural elements as well - without taking into account the damping capacity of the solder layers at the ends of thermocouples. The analysis and comparison of the theoretical results were carried out.
The results of the calculation determining the natural vibration frequencies of thermoelectric coolers (TEC) through a system of Lagrange equations of the 2nd kind were compared with the calculated values obtained by using the method of electrodynamic analogies.

Open Access Short Research Article

Control of the Citrus Disease Complex in Iraq

Bassima G. Antoon, Ismail Ibrahim Alyasiri, Sameer Abid Al-Razzak

Current Journal of Applied Science and Technology, Page 1-4
DOI: 10.9734/BJAST/2015/17708

This study was conducted in a citrus orchard in Baghdad province, Iraq. Roots were severely infected with citrus-root nematode Tylenchulus semipenetrans and the fungus Phytophthora citrophthora, die back symptoms were highly observed on the vegetative growth, and the yield of these trees were very poor. The experiment included 16 treatments using three nematicides Rugby (Cadusafos), Mocap and Garland, and three fungicides Previcure, Agrifos and Nando, and the control (untreated) with three replicates/treatments. Each treatment was about 50 m2 and consists of ten citrus trees using complete randomized block design (CRBD). Soil and root samples were taken a week before treatment and six months after treatment for nematode extraction (250 g soil and 1 g roots) and for fungus using potato dextrose agar media (PDA) for germination.
Results indicated that all the fungicides applied had no effect on citrus root nematode, but when they were applied with nematicides simultaneously there was a sharp decline in nematode population. All the nematicides applied in this experiment were highly effective against the nematode and significantly reduced their number compared to the untreated (control) plot. Rugby (Cadusafos) was significantly effective than the other nematicides, where the number of nematodes in 250 g soil and 1 g root reduced from 3833.3 and 1876 juvenile before treatment to 333.3 and 124 juveniles after treatment respectively. Similar effect was found when these nematicides were applied with the fungicides for controlling the disease complex and it was found that Rugby again was highly effective than the other applied nematicides.

Open Access Original Research Article

Arabic Text Summarization Using Latent Semantic Analysis

Fadl Mutaher Ba-Alwi, Ghaleb H. Gaphari, Fares Nasser Al-Duqaimi

Current Journal of Applied Science and Technology, Page 1-14
DOI: 10.9734/BJAST/2015/17678

The main objective of this paper is to address Arabic text summarization using latent semantic analysis technique. LSA is a vectorial semantic form of analyzing relationships between a set of sentences. It is concerned with the word description as well as the sentence description for each concept or topic. LSA creates the word by sentence semantic matrix of a document or documents. Each word in the matrix row is represented by word variations such as root, stem and original word. The root is empirically specified as the most effective word representative, where F-score of 63% is obtained at the same time an average ROUGE of 48.5% is obtained too. LSA is implemented along with root representative and different weighting techniques then the optimal combination is specified and used as a proposed summarizer for Arabic Text Summarization. Then the summarizer is implemented again, where the input documents are pre-processed by POS tagger. The summarizer performance and effectiveness are measured manually and automatically based on the summarization accuracy. Experimental results show that the summarizer obtains higher level of accuracy as compared to human summarizer. When the compression rate is 25% F-scores of 68% is obtained and an average ROUGE score of 59% is obtained as well, in terms of Arabic text summarization.

Open Access Original Research Article

Increasing Fruit Set, Yield and Fruit Quality of "Canino" Apricot Trees under Two Different Soil Conditions

Nevine M. Taha, Hanaa M. Sherif

Current Journal of Applied Science and Technology, Page 1-18
DOI: 10.9734/BJAST/2015/18831

The present investigation was carried out during 2012 and 2013 on 'Canino' apricot trees budded on seedling rootstock at two private orchards located at El-Khatatba district (as sand soil ) and El – Neanaaia village, (as clay soil) Menoufia Governorate, Egypt. Trees were sprayed four times at the start of growth in the 3rd week of February(swelling bud stage), at flowering (balloon stage)in the 1st week of March, just after fruit setting in the first week of April and month before harvest with three sources of calcium, Inca (Ca & Zn) at two concentrations (1&2 cm3), Klover Calbora (Ca & B chelated on hepta glouconic acid) at two concentrations (1&2 cm3) and Calciven (soluble CaCl2 chelated on amino and organic acids & 5% B) at two concentrations (1&2 cm3). Results showed that, higher concentration of the studied treatments was mostly more effective than low one. Clay soil supported better fruit set, yield, leaf chlorophyll, Ca, Zn, B and TSS while sand soil encouraged fruit weight, size, dimensions flesh thickness and firmness but also decreased fruit drop.

Open Access Original Research Article

Adoption of eLearning Technology in Nigerian Tertiary Institution of Learning

Olabode Olatubosun, Fasoranbaku A. Olusoga, Oluwadare A. Samuel

Current Journal of Applied Science and Technology, Page 1-15
DOI: 10.9734/BJAST/2015/18434

Recent development in the telecommunication industry in Nigeria has brought about an unprecedented upsurge in the use of Information Technology for teaching and learning in tertiary institutions of most part of the developed countries of the world. However, the adoption and implementation of web-based course management and learning tool (Moodle) in most developing countries like Nigeria is still in the infancy. In this paper, we utilize the modified versions of the unified theory of acceptance and use of technology (UTAUT) model in explaining elearning adoption in higher education in a developing country and evaluate the size and direction of the impacts of the UTAUT factors on behavioral intention and use behavior to adopt elearning in higher education. The data were obtained through a web survey of students of two universities in Nigeria and the models are estimated in a structural equations modelling framework using Lisrel 8.8. The entire UTAUT construct with their relationships are confirmed using the confirmatory test statistics. The results suggest that, it is well established that the latent variables significantly explain the Venkatesh model.

Open Access Original Research Article

A Three Dimensional Finite Element Analysis for Contact Stress and Fatigue near the Fir-Tree Region in a Gas Turbine Blade

Ganesh R. Navad, Narasimha Marakala, K. Vasudeva Karanth, N. Yagnesh Sharma

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/BJAST/2015/17442

In this work an attempt is made to simulate the life of a rotating element subjected to the phenomenon of fatigue fretting using finite element analysis. A numerical model is being proposed to analyse the fretting failure phenomenon. The model explores the physics of the problem with a view to capture micro slip at the interface between the root and the disc. Some of the parameters that affect fretting are dissimilar material component types, kinds of fit, geometry of the mating part etc. The effect of these parameters on the extent of fretting is being analysed using the commercial finite element tool ANSYS. This will enable one to gauge failure criterion of the part to be designed under different cyclic loading conditions subjected to fatigue fretting failure. It is found out from the present analysis that the bottom tooth of the fir tree structure experiences the maximum stress induced at the interface. Also the stress increases non-linearly as the speed increases. As the flank angle is increased, the fatigue life at higher speeds decreases. Also the equivalent stress decreases as the number of teeth increases.

Open Access Original Research Article

Comparative Study of the Leachability of Heavy Metals from Sewage Sludge, Sawdust and Organic Fraction of Municipal Solid Waste

Christopher B. Afangideh, Chidozie C. Nnaji, Chukwuemeka Onuora, Chigozie Okafor

Current Journal of Applied Science and Technology, Page 1-13
DOI: 10.9734/BJAST/2015/17754

The comparative study of the leachability of sewage sludge, sawdust and organic fraction of municipal solid (OFMSW) waste was conducted at different rainfall intensities. First, the natural moisture content of the three categories of waste were obtained. Samples of the wastes were air-dried and then subjected to heavy metal tests to determine the initial and overall heavy metal content. Sewage sludge, sawdust and OFMSW were subjected to different rainfall intensities and the concentrations of cadmium (Cd), lead (Pb), chromium (Cr), arsenic (As) and copper (Cu) in the resultant leachates were determined using atomic absorption spectrophotometer. The pH ranges of 6.08 to 6.28, 7.62 to 8.38 and 7.62 to 8.27 were obtained for leachate from saw dust, sewage sludge and OFMSW respectively. The moisture content of sawdust, sewage sludge and OFMSW were 4.58%, 44.4% and 56.06% respectively. Sewage sludge had the highest heavy metal content distributed as follows: Cu (0.4 ppm), As (4.3 ppm), Cr (0.207 ppm), Cd (0.362 ppm) and Pb (2.57 ppm) with arsenic and lead being the highest. There was a good correlation between the concentrations of heavy metals in the waste media. The highest correlation was between Cd and Pb (R =-0.99996). There was no significant difference in the concentrations of the various heavy metals in the waste media at 95% confidence limit. Copper was the most leachable and sawdust was the most susceptible to copper leaching. On the other hand, cadmium, arsenic and lead exhibited the least leachability, suggesting a measure of affinity between these metals and the wastes.

Open Access Original Research Article

Solutions of Sequential Conformable Fractional Differential Equations around an Ordinary Point and Conformable Fractional Hermite Differential Equation

Emrah Ünal, Ahmet Gökdoğan, Ercan Çelik

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/BJAST/2015/18590

In this work, we give the power series solutions around an ordinary point, in the case of variable coefficients, homogeneous sequential linear conformable fractional differential equations of order 2α. Further, we introduce the conformable fractional Hermite differential equations, conformable fractional Hermite polynomials and basic properties of these polynomials.

Open Access Original Research Article

Development and Testing of Sorption Isotherm Equipment for Nigerian Coal

Ojo Tolulope Elizabeth, Adewale Dosunmu, Okoro Emeka Emmanuel, Ekeinde Evelyn Bose

Current Journal of Applied Science and Technology, Page 1-14
DOI: 10.9734/BJAST/2015/18445

Aim: The aim of the study is to investigate the methane content in Nigerian coal.
Study Design: Fabrication of Sorption Isotherm Equipment and Experimental Analysis.
Place and Duration of Study: Department of Petroleum and Gas Engineering, University of Port Harcourt Rivers State, between June, 2014 and January, 2015.
Methodology: This study includes the Fabrication of Isotherm Adsorption Equipment, Methane Sorption test, Proximate Analysis, Ultimate Analysis, and Estimation of Methane Content.
Results: The maximum moisture and fixed carbon was found in Sample D with moisture content of 3.35%, fixed carbon content of 60.41%; and it also has the minimum ash content of 5.61%. The maximum volatile matter was found in Sample B with volatile matter of 33.57%. The estimated methane content from the Meissner’s method differs from those obtained from the adsorption Isotherm equipment by 22%.
Conclusion: The adsorption isotherm models obtained, showed that the total organic carbon content is not a significant factor in the adsorptive and dispersive behaviors exhibited by the shale samples. It was also observed that pressure plays a major role in the adsorption process of methane gas from the coal samples.

Open Access Original Research Article

Application of Ant Colony Optimisation Algorithm on Solid Waste Collection: A Case of University of Port Harcourt

Oghenefejiri Bovwe, Ify L. Nwaogazie

Current Journal of Applied Science and Technology, Page 1-19
DOI: 10.9734/BJAST/2015/18907

Ants are social insects and their behaviour is geared towards the survival of the colony rather than the survival of the individual. Because ants are almost blind, they move along by building chemical trails using a chemical substance called pheromone. These trails are used by ants to find the way to food or back to the colony, using the shortest or otherwise optimised path. This informed the development of The Ant Colony Optimization (ACO) Algorithm. This algorithm was applied to the waste collection system of the University of Port Harcourt so as to optimize the route for solid waste collection within the Institution. University of Port Harcourt has three campuses, namely Choba, Delta and University Park campuses which are networked within a radius of about 1.5 km, separated by two expressed ways. University Park was split into two, Section 1 and Section 2 for this study. The primary data used for this study was gotten with the help of the Global Information System, personal observation and monitoring of waste collection points and tours within the Institution. At the end of the optimization process, the ACO was able to reduce the tour path for Choba Park by 937.66 m, Delta Park by 1255.99 m, Abuja Park section 1 by 3779.89 m and Abuja Park Section 2 by 1875.15 m representing 33.5%, 31.43%, 51.48% and 32.16%, respectively. However, considering the physical nature of the built environment, a Best Tour Path (BTP) rather than the optimized path was chosen. This gave a total distance reduction of about 16% cumulatively.