Open Access Short Research Article

Influence of Higher Volumes of Clay Pozzolana Replacement Levels on Some Technical Properties of Cement Pastes and Mortars

Mark Bediako, Eugene Atiemo

Journal of Scientific Research and Reports, Page 3018-3030
DOI: 10.9734/JSRR/2014/9046

Most of the investigations on the utilization of clay pozzolana are limited to about 30% of the material consideration in Portland cement. In this study clay pozzolana was used to replace cement between 30% and 50%. Clay pozzolana was analyzed to determine their chemical and mineralogical composition. Both binder paste and mortar were formulated and results compared to unblended cement system. Some selected technical properties such as water demand, setting times and strength determination were performed. The work also determined the economic benefits of the optimum pozzolana mortars and compared with the unblended mortar mix. Test results indicated that cement-pozzolana system demanded high water, caused an extended setting times as well as strength reduction. Although the strength values were reduced, optimum mix proportions were very good for the formulation of ASTM type M and type S mortar class.

Open Access Original Research Article

The Impact of Closed-circuit Television System on Crime in Korea

Sungmin Bang, Jinsung Kim, Seok Lee

Journal of Scientific Research and Reports, Page 2934-2942
DOI: 10.9734/JSRR/2014/13377

The current research investigated whether open-street CCTV (Closed Circuit Television) system reduces crime or not. Crime data and open-street CCTV data from a Korean city were used to find the answer to the research question. The research designated all crime, serious crime, and disorder crime variables as response variables, and camera, length of month, trend, and seasonal effect variables as predictor variables. Multiple linear regression and Possion regression model were used for analyzing the data. Appropriate model was developed for each response variables after checking various methods. The findings showed that open-street CCTV had mixed effects on crime depending on crime types.

Open Access Original Research Article

Variability of Characteristics and Productive Potential of Some Pedons on the Basement Complex of Southwestern Nigeria

G. E. Akinbola, M. O. Adigun, O. H. Ajimoh

Journal of Scientific Research and Reports, Page 2943-2959
DOI: 10.9734/JSRR/2014/12689

The objective of this study is to assess variability of land quality and soil characteristics of some of the pedons on the basement complex of southwestern Nigeria. Variation in soil properties and their relationship with crop production must be studied and understood to ensure sustainability of soil. Soil characteristics can vary significantly across most fields used for crop production. Interaction among the parent materials, topography, vegetation, tillage, fertilization, make variation across fields the norm rather than the exception. Some soil chemical parameters of pedons on two locations (Alaho-Olokutaand Ajibode) were assessed.
Coefficient of variation was used to evaluate the level of variability of the parameters. The coefficient of variability for pH (Top and Subsoil) for both sites was <15%; for site 1 top soil most of the pH falls below 15%, likewise for site 2 except Balogun series with CV 22.94%. Total N and Organic carbon were extremely variable among the pedons and between the two sites. Organic C in site 1(167, 160, 125, 90.35, 235, 20.9, 134 and 107, 96.41, 40.0, 53, 89, 120, 78%), site 2(102, 105, 133, 71.39, 164, 11.1 and 111, 48.4, 68.26%) respectively.
In site 1, potassium has the least variability while in site 2 it was moderately variable except for Balogun series. ECEC, topsoil and subsoil; (15.78, 14.19, 10.04, 12.55, 19.78, 35.14 and 13.16, 5.15, 5.16, 2.05, 7.94, 3.60, 12.10, 3.69%) was least for site 1, it varied for site 2 topsoil and subsoil ranges from least to moderately variable (25.5, 4.7, 4.6, 7.1, 18.6, 21.9, 15.2, 0.01, 7.5, 4.4, 26.5 and 16.6%) respectively. Results from this investigation showed that the key knowledge of soil chemical and physical properties could influence organic and inorganic fertilizer application at the appropriate time to ensure sustainable crop production on the soils.

Open Access Original Research Article

Application of Data Mining Techniques to Audiometric Data among Professionals in India

J. Majumder, L. K. Sharma

Journal of Scientific Research and Reports, Page 2960-2971
DOI: 10.9734/JSRR/2014/12700

Aims: Noise induced hearing loss (NIHL) is among the principal occupational health hazard. To illustrate that, in order to enrich the database on audiometric status and fast dissemination of knowledgebase, data mining techniques are imperative tools.
Study Design: A cross sectional study design was used.
Place and Duration of Study: Pure tone audiometric data of both ears of drivers that have 10 years working experience and office workers from Kolkata City, India were recorded.
Methodology: The data were subjected to both unsupervised and supervised learning techniques, in turn, in order to train the classifier that determines the clusters for newly generated cases. Expectation Maximization (EM), k-means, Linear Vector Quantization (LVQ), and Self Organization Map (SOM) unsupervised learning techniques were utilized.
Results: Silhouette Plot (SP) validation showed that 93.3% of the considered cases for the left ear and 85.8% for the right ear were correctly classified. These metadata were further subjected to supervised learning algorithm to achieve a high level correctly classified result, in which, each cluster bears its class label. Naïve Bays Classifier (NBC) recorded, as accurate (98.8%) for both left and right ears. The high accuracy of supervised learning algorithms, cross validated with 10-fold cross validation tends to predict the class of audiometric data whenever a newly generated data are introduced.
Conclusion: This feasibility of using machine learning and data classification models on the audiometric data would be an effective tool in the hearing conservation program for individuals exposed to noisy environments in their respective workplaces.

Open Access Original Research Article

Job Satisfaction and Job Performance, A Study on Colleges of Saudi Arabia

Taslim Khan

Journal of Scientific Research and Reports, Page 2972-2981
DOI: 10.9734/JSRR/2014/9931

Aims: The purpose of this current study is to examine the relation between job satisfaction and job performance among the employees who are currently working for colleges in eastern region of Saudi Arabia.
Study Design: Research Study was based on MSQ, The Employees were from Non -Teaching Background the data was collected from three different colleges and 91 samples were collected as completely filled for this study.
Place and Duration of Study: Kingdom of Saudi Arabia, the duration was of 2 months, from November to January (2013-2014).
Methodology: The Sample of the present study is drawn from non - teaching employees from different colleges of Saudi Arabia mainly from the eastern province. 125 questionnaires were distributed among the employees of 5 colleges. Simple random sampling technique was used and 91 responses were returned with a response rate of 75.8%. The researcher distributed the questionnaire in person.
Results: The result indicates that there is a positive significant association between job performance and job satisfaction. The result also reveals that job satisfaction affects job performance. The present study suggests that the management should pay more attention onto non - teaching employees’ job satisfaction in order to enhance job performance.
Conclusion: The key purpose of the current study was to observe the relation among satisfaction of job and job performance, mainly the employees, who are working at various colleges of Saudi Arabia. The outcome of the current study reveals a significant positive association between job satisfaction and job performance.

Open Access Original Research Article

Retrospective Analysis of Incidental Duodenal Diverticulum: CT and MRI Findings

Melike Rusen Metin, Hasan Aydin, Idil Gunes Tatar, Oktay Algin, Ozlem Sarici, Mehmet Kilin

Journal of Scientific Research and Reports, Page 2982-2997
DOI: 10.9734/JSRR/2014/11984

Purpose and Objective: To detect retrospectively the duodenal diverticula in the routine abdominal CT and MRI.
Materials and Methods: Between March 2005 to June 2013, 151 incidental duodenal diverticulas were found out through 120.000 abdominal CT and/or MRI. Two abdominal radiologists evaluated the suspicious diverticula cases together with consensus. CT examinations were performed at 16 and 64 detector, Philips multislice CT and MR imaging was performed at 1.5 T Intera- Achievva, Philips Medical systems.
Results: Incidence of duodenal diverticula in this research was about 0.013%,112 diverticulas along the second part of duodenum, 3 at duodenal bulbus, 5 diverticulas at jejenum, 2 along fourth part of the duodenum, 37 along third part were discovered. 16 diverticula patients regarded complications, Urgent laparatomy was performed for 3 patients with perforated diverticulum, other complicated diverticulas were treated conservatively
Conclusion: Duodenal diverticula may lead to severe complications like perforation and/or diverticulitis, Multislice CT may show diverticulum in most cases, along with inflammatory exudates and surrounding extraluminal gas and contrast agent accumulation.

Open Access Original Research Article

Inflation Correlation with Commercial Real Estate’ Investment Returns in Akure, Nigeria

Daniel Ibrahim Dabara

Journal of Scientific Research and Reports, Page 2998-3017
DOI: 10.9734/JSRR/2014/12918

This study aims at investigating the relationship between inflation and commercial real estate’ investment returns with a view to determining the inflation-hedging characteristics of commercial property investments in Akure metropolis, Nigeria. Questionnaire survey was conducted to obtain primary data on rental and capital values of commercial properties from branch managers of Estate Surveying and Valuation Firms in the study area. This was subsequently translated to the income, capital and total returns. Similarly, secondary data with respect to the Nigerian Consumer Price Index (CPI) which was used as a proxy for actual inflation and the 90-day Treasury bill rates (used as proxy for unexpected inflation) for the period between 2002 and 2012 were also collected from the National Bureau of Statistics (NBS) and the Central Bank of Nigeria (CBN), respectively. The unexpected inflation was calculated as the difference between the actual and expected inflation. The 3 groups of data sets obtained for the study were subjected to the Phillip-Perron unit root test as well as the Odinary Least Square Regression analysis. The study revealed that the inflation-hedging characteristics of commercial property investments in Akure metropolis vis-à-vis the actual inflation provides a perverse hedge (with betas -0.464,-0.360 and -0.609 for the income, capital, and total returns, respectively), similarly, vis-à-vis the expected inflation also provides a perverse hedge (with betas -0.595,-0.147 and -0.597 for the income, capital, and total returns, respectively). However, vis-à-vis the unexpected inflation component provides a partial hedge (with betas 0.183, 0.134 and 0.079 for the income, capital, and total returns, respectively). The results of this study can be useful for investment forecasts as well as investment decisions on asset types to include in portfolios as a measure for protecting investors’ earnings from erosion by inflation most especially in an emerging property market like Akure, Nigeria.

Open Access Review Article

A Review on the Use of Stress Absorbing Membrane Inter Layers (SAMIs) as Remedy for Reflective Cracks in Pavement

J. O. Aribisala, O. M. Ogundipe, O. O. Akinkurolere, O. L. Oke

Journal of Scientific Research and Reports, Page 2923-2933
DOI: 10.9734/JSRR/2014/13166

This paper looks at the need for Nigeria to adopt innovative road maintenance strategy to reduce the colossal amount expended on construction and maintenance of roads. Federal government budget to Federal Ministry of Works in 2012 is N199, 032, 816, 621 (199 billion). Federal roads account for only 17% of total roads in Nigeria with Local government roads being 67% of the total. It highlights the defects in road pavement in general with emphasis on reflective cracking, which is the major problem of overlaid pavement, its causes and mechanism. The paper reviews successes recorded in the use of Stress Absorbing Membrane Interlayers (SAMIs) which is the use of stress-relieving interlayer at the interface between the overlay and the old pavement. Its use for both road and airport pavements has been largely successful based on the series of laboratory and field examinations.