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International Journal of Advances in Applied Sciences

IJAAS
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Published by Institute of Advanced Engineering and Science

ISSN : 22528814 EISSN : 27222594 DOI : http://doi.org/10.11591/ijaas

Core Subject : Science, Education, Social,

Earth & Planetary Sciences Environmental Science Materials Science & Nanotechnology Mathematics Physics

International Journal of Advances in Applied Sciences (IJAAS) is a peer-reviewed and open access journal dedicated to publish significant research findings in the field of applied and theoretical sciences. The journal is designed to serve researchers, developers, professionals, graduate students and others interested in state-of-the art research activities in applied science areas, which cover topics including: chemistry, physics, materials, nanoscience and nanotechnology, mathematics, statistics, geology and earth sciences.

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Articles 680 Documents

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INVESTIGATION OF SUBSURFACE STRUCTURES WITHIN PARTS OF NIGER DELTA, NIGERIA, VIA AEROMAGNETIC DATA Ekpa, Moses M; Ibuot, Johnson Cletus; Okeke, Francisca N.; Obiora, Daniel N.
International Journal of Advances in Applied Sciences Vol 10, No 1: March 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijaas.v9.i4.pp%p

Geophysical study involving aeromagnetic method was carried out to investigate partsof Niger Delta in Nigeria, aimed at investigating the cause and nature of anomalous bodies within the study area. Spectral analysis technique was employed in quantitative interpretation to determine depth/thickness of the sedimentary basin, basement topography, structural trends,curie point depth, thermal gradient and heat flow in the area. The total magnetic intensity (TMI) anomalies had values of between -53.7nT and 119.5nT while the residual magnetic intensity ranged from -52.5 to 58.0nT. The spectral analysis revealedthe depth to magnetic sources varying from 2.5 to 5.5km while the shallow magnetic sources varied from 0.89 to 1.47km. The geothermal analysis revealed the curie point depth between 11.782 and 18.048km while the calculated geothermal gradient ranged lie between 32.137 and 49.231o . The heat flow values ranged from 80.343 to 123.080 . The results from this study have thrown more light to the understanding of the variation of subsurface structures in the study area. These will enhance the development of the resources and will be of economic benefit to the country if well harnessed. However, possible future research work on this active area is proposed for more robust results.

Critical Impact Energy of Flat Nose Hard Projectile Causing Early Scabbing in Concrete Slab Dr. Qadir Bux alias Imran Latif; Assoc. Prof. Dr. Ali Al Nuaimi; Prof. Dr. Ismail Abdul Rahman; Prof. Dr. Ahmad Mujahid Ahmad Zaidi
International Journal of Advances in Applied Sciences Vol 3, No 3: September 2014
Publisher : Institute of Advanced Engineering and Science

In this paper, 2D numerical simulation finite element analysis has been carried out for critical impact energy of flat nose hard projectile causing early scabbing in concrete slab, based on reflected stress wave propagation with elastic assumption of the classic wave equation, using ABAQUS software. Numerical simulation predictions were compared with experimental data and with the well established UMIST, NDRC, Li and Reid formulae and found comparable and reliable. The influence of hard projectile diameter with flat nose, and concrete wall thickness on critical impact energy was also investigated. It was found that the effect of critical impact energy is directly proportional to the thickness of concrete target and inversely proportional to the diameter of flat nose hard projectile.

A model free dissolved oxygen controller for industry effluent using hybrid variables measuring technique P. Kingston Stanley; Sanjeevi Gandhi A.; D. Abraham Chandy
International Journal of Advances in Applied Sciences Vol 8, No 2: June 2019
Publisher : Institute of Advanced Engineering and Science

The present scenario of the world relays on water scarcity, enormous amount of water is needed for people but the world has pollution which makes a great effect. Water is polluted due to various reasons such as industrial waste, sewage, and global warming and oil pollution and mainly polluted due to industrial effluent waste water. The main objective of this paper is to control the dissolved oxygen of the industrial waste water by measuring turbidity and dissolved oxygen (DO). Turbidity is measured through the intensity of the light through the medium in Nephelometric unit (NTU) and dissolved oxygen is measured in PPM through amperometic electrode method. The controller is designed to improve the quality of the effluent water through the aeration process. The very low concentration of dissolved oxygen (DO) level is too harmful to the aquatic ecosystem and it pollutes the water to the maximum extent. This measurement method of turbidity has an enhanced idea which processed with the software and it is monitored. The controller is designed as such with the condition of inverse proportionality of water turbidity and dissolved oxygen, which contributes an additive advantage to the concept design.

Neuropharmacognosy as an Emerging Multidisciplinary Science Abdelaziz Ghanemi; Besma Boubertakh
International Journal of Advances in Applied Sciences Vol 3, No 1: March 2014
Publisher : Institute of Advanced Engineering and Science

Neuropharmacognosy represents the field that combines neuroscience and pharmacognosy. It allows us to better understand and use the data that pharmacognosy provides and apply them in neurosciences which may lead to new therapeutic approaches.The existence of both pharmacological and toxicological aspects of neuropharmacognosy creates more challenges. However, the methodsprovided by the related fields, such as chemistry and biology, let us expect more advances and hopefully new perspective that would overcome the current challenges

Medical Documentation Practice of Health Professionals and Attitude towards it at University of Gondar Hospital, Gondar, North West Ethiopia Adinew Belay; Y. Narasimha Rao
International Journal of Advances in Applied Sciences Vol 5, No 4: December 2016
Publisher : Institute of Advanced Engineering and Science

Medical documentation is believed as pertinent facts of medicalcare plan. It is a warehouse for patient’s information and interaction with theircaregivers in particular. However, there are lack of completeness, consistency,proper recoding and other constraints regarding the current medical recordpractice. The main objective of this study was to assess the current medicaldocumentation practice of health professionals and attitude towards it atUniversity of Gondar Hospital, Gondar, North West Ethiopia, 2016.Institution based cross sectional quantitative study was conductedfrom March 15 to April 30, 2016 at University of Gondar Hospital. About 260health professionals who work in different wards were participated. Data werecollected using structured self-administered questionnaires of professionals andreviewed their recorded medical documentation (chart). Logistic regressions;both bi-variable and multi-variable logistic regressions analyses models werefitted. The odds ratio with 95 % CI was computed and these variables which havea (p-value < 0.05) in the multi-variable logistic regression analysis model weretaken as statistically significant and interpreted accordingly. Good medical documentation practice by health professionals was 45.4% (n=118). Documentation for all patients using documentation standard toolswith AOR=1.799(95%CI [1.065, 3.040]), working area with AOR=2.522(95%CI[1.264, 5.033]), and favourable attitude towards medical documentation withadjusted OR=1.182(95% CI [1.039, 3.169]) were significantly associated withgood medical documentation practice.Medical documentation practice at University of Gondar Hospital was found low.Documentation using standard tools, working area (setting) and attitude ofprofessionals were important factors associated with medical documentationpractice. Organizational support needs to be strengthening, ensure procedure,format and documentation type (including documentation tools and forms); etcneeds emphasis to improve documentation practice.

Percentiles of Range: Pareto Type Model R. Subba Rao; G. Prasad; R. R. L. Kantam
International Journal of Advances in Applied Sciences Vol 2, No 3: September 2013
Publisher : Institute of Advanced Engineering and Science

Statistical quality control relates heavily on the goodness of control chart limits. The more accurate those limits are, the more likely are to detect whether a process is in control. Various procedures have been developed to compute good control limits. This paper proposes construction of Range chart by considering a Pareto distribution of IV kind. The cumulative distribution function of sample range from their distribution is derived. The percentiles of the distribution of range are worked out and are used to construct the control limits. The performance of the control chart is compared with that of gamma based control chart. Interval estimation for the scale parameter is also worked out.

A Fuzzy GA Based STATCOM for Power Quality Improvement S. Deepa; K. P. Nithya; C. S. Ajin Sekar; V. Deepalakshmi
International Journal of Advances in Applied Sciences Vol 6, No 3: September 2017
Publisher : Institute of Advanced Engineering and Science

This paper deals with various power issues such as voltage sag, swell, harmonics, and surges using static synchronous compensator (STATCOM).The conventional controller suffers from uncertain parameters and non-linear qualities. However they are computationally inefficient extending to optimize the fuzzy controller (FC) parameters, since they exhaustively search the optimal values to optimize the objective functions. To overcome this drawback, a genetic algorithm (GA) based Fuzzy controller parameter optimization is presented in this paper. The GA algorithm is used to find the optimal fuzzy parameters for minimizing the objective functions. The feasibility of the proposed GA technique for distribution systems to improve the sag and total harmonic Distortion (THD) as major power quality indices in sensitive loads at fault conditions has been simulated and tested. Therefore, the multi-objective optimization algorithm is considered in order to attain a better performance in solving the related problems.

An Experimental Investigation on Spot Weld Growth on Dissimilar Joints of 304L Austenitic Stainless Steel and Medium Carbon Steel (Part 1) Nachimani Charde
International Journal of Advances in Applied Sciences Vol 2, No 1: March 2013
Publisher : Institute of Advanced Engineering and Science

Carbon steels and stainless steels are more frequently welded joints than any other materials because of their weldability characteristics. So the spot welded joining characteristic of these two materials are discussed in this paper. The experiment was conducted on medium carbon steel and 304L austenitic stainless by varying the process controlling parameters; such as welding current, welding time and electrode pressing force. As such two sets of data were collected to characterize the formation of spot weld using pneumatic based 75kVA spot welder. The first set was made for the variation of welding time and current whereas the second was made for the variation of welding current and electrode force. The welded specimens are finally underwent the tensile test, hardness test and metallurgical test to characterize the weld growth. The weld nugget growth was noticed for the welding current and weld time increment except the electrode force. By increasing the electrode force, the process resistances were reduced and consequently the weld nugget was reduced. Moreover the effect of heat imbalance was clearly noticed in the weld nuggets due to different electrical and chemical properties.

Study of Absorption Loss Effects on Acoustic Wave Propagation in Shallow Water Using Different Empirical Models Yasin Yousif Al-Alaboosi; Jenan Abdulkhalq Al-Aboosi
International Journal of Advances in Applied Sciences Vol 7, No 1: March 2018
Publisher : Institute of Advanced Engineering and Science

Efficient underwater acoustic communication and target locating systems require detailed study of acoustic wave propagation in the sea. Many investigators have studied the absorption of acoustic waves in ocean water and formulated empirical equations such as Thorp’s formula, Schulkin and Marsh model and Fisher and Simmons formula. The Fisher and Simmons formula found the effect associated with the relaxation of boric acid on absorption and provided a more detailed form of absorption coefficient which varies with frequency. However, no simulation model has made for the underwater acoustic propagation using these models. This paper reports the comparative study of acoustic wave absorption carried out by means of modeling in MATLAB. The results of simulation have been evaluated using measured data collected at Desaru beach on the eastern shore of Johor in Malaysia. The model has been used to determine sound absorption for given values of depth (D), salinity (S), temperature (T), pH, and acoustic wave transmitter frequency (f). From the results a suitable range, depth and frequency can be found to obtain best propagation link with low absorption loss.

Quantitative Structure Property Relationship Modeling for Prediction of Retention Index for a Set of Some Organic Compounds Mehdi Rahimi; Hossein Farahbakhsh; Nasrin Salehi
International Journal of Advances in Applied Sciences Vol 1, No 2: June 2012
Publisher : Institute of Advanced Engineering and Science

One of the most ubiquitous challenges of the scientists is the theoretical evaluation of experimental parameters to validate and improve their ability. Plant essential oils and their extracts have been greatly employed in folk medicine, food flavoring, fragrance and pharmaceutical industries. This work is a part of our comprehensive investigation to correlate the experimental and calculated retention indices (RI) of the some organic compounds from K. Javidnia et al. The structures of all organic compounds were drawn into the HYPERCHEM program and optimized using semi-empirical AM1 method, applying a gradient limit of 0.01 kcal/Å as a stopping criterion for optimized structures prior to geometry optimization step. Then molecular descriptors were calculated for each compound by the DRAGON software on the minimal energy conformations. The Stepwise SPSS was used for the selection of the variables that resulted in the best fitted models. By molecular modeling and calculation of descriptors, four significant descriptors (XMOD, PCD, MATS2e, GATS2e) related to the retention indices values of the essential oils, were identified. After the variables selection, the MLR method used for building the regression models. The statistical figures obtained by the proposed model are R2=0.989, RMSEP=53.08, REP =3.83 and SEP =54.94. In the final step, models generated were used to predict the retention index for a set of test compounds.

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