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Search Results: 1 - 10 of 549421 matches for " A. F. "
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Variations in the Water Quality of an Urban River in Nigeria  [PDF]
F. A. Oginni
Computational Water, Energy, and Environmental Engineering (CWEEE) , 2013, DOI: 10.4236/cweee.2013.22B014
Abstract: Sango-Ota is the industrial nerve centre of Ogun State in Nigeria. River Atuara is an urbanized river in this town. The aim of this study is to assess the quality of water in the river along its 13 km urbanized stretch within Owode – Ota and Gbenga quarters of Sango – Ota in Ogun State, Nigeria. A study of some physical and chemical analysis was carried out to determine the level of pollution in the river. Total Dissolved Solids, TDS, pH, Colour and Temperature measurements were obtained for nine locations on the 21 km river stretch. Laboratory analyses were carried out at 4 locations along the water course for the following parameters: pH, Conductivity, Turbidity, DO, BOD, COD, TDS, TSS. Others include Phosphate, Chloride, Nitrate, Sulphate, Cadmium, Lead, Iron, Copper, Zinc, and Nickel. Results indicate that the water quality reduces downstream of the urbanized stretch. Some of the level of heavy metals in the river calls for concern. At Owode, the lead content of 0.11 mg/L is too high compared to a maximum of 0.01 mg/l permissible, which can cause cancer. This can interfere with Vitamin D metabolism, and can affect mental development in infants. It is toxic to the central and peripheral nervous systems. Cadmium is below 0.002 which is just below the 0.003 mg/l permitted in Nigeria. Nickel content was 0.046 mg/l between Owode and Ewupe and this is above the maximum permissible level of 0.02 for Nigeria. This has the possibility of carcinogenic health impact. Owode and Ewupe have greater industrial impacts than the other two locations, Igboloye and Gbenga. The trends of each of the 21 parameters from the urbanized stretch of the river have been observed to follow a pattern that can be categorized as similar, mirrored, somersault and composite of mirrored and somersault. More studies were recommended in this direction as well as in determining the locations of factories and industries contributing to the pollution level around Ewupe and their effluent disposal programs will need to be ascertained.
The use of natural cold in the processing and storage of food in the extreme conditions of Yakutia  [PDF]
A. F. Abramov
Agricultural Sciences (AS) , 2013, DOI: 10.4236/as.2013.49B001
Abstract:

The basic directions of development on the use of natural cold in the processing and storage of food in the extreme conditions of Yakutia are discussed in this paper.

The Scope and Future of Local Government Autonomy in Nigeria  [PDF]
F. A. Olasupo
Advances in Applied Sociology (AASoci) , 2013, DOI: 10.4236/aasoci.2013.35028
Abstract:

The crisis of Local Government autonomy in Nigeria is a recurrent issue. How much autonomy this third tier of government possesses is unclear and uncertain to the extent that it engenders the problem of measurement. In other words, what are the defining characteristics of Local Government autonomy? How can it be evaluated and measured?

Diurnal Variations and Spikes by the Torsind Registered and Their Impact on the Accuracy of G Measurement  [PDF]
A. F. Pugach
International Journal of Astronomy and Astrophysics (IJAA) , 2015, DOI: 10.4236/ijaa.2015.51005
Abstract: The article reports on the results of an analysis of the torsind behavior long-term observations. The torsind is a species of ultralight disc torsion balance. The data analysis showed that the signal recorded contains the 24-hour periodic component presumably associated with the Sun. Moreover, unpredictable strong impacts, forcing torsind disk to rotate in one or another direction, were revealed. Presumably the reason of these effects is the Sun. This indicates the existence of an unknown radiation that bears a torque which may impact on the mechanical systems dynamics. This fact leads to the need to measure the gravitational constant G overnight and during periods of minimum of the solar activity, provided that the G measurements are carried out using a torsion balance.
Entanglement: A Contrarian View  [PDF]
A. F. Kracklauer
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.613202
Abstract: Entanglement is defined in terms of some kind of instantaneous interaction, contrary to the relativistic principle that all interaction is possible only at a velocity less than that of light. This conflict with an otherwise inviolate principle justifies re-examination of the arguments leading to its (ostensible) rejection. Herein the historically essential notion, namely wave-collapse by measurement or the “Projection Hypothesis” of von Neumann is brought to attention and seen to violate Popper’s Principle of negatability; thereby disqualifying it as a scientific proposition. Further, it is observed that polarization of electromagnetic signals as used in experiments testing Bell Inequalities is described by structure excluding quantum principles. Consequently, most experiments taken to verify Bell’s conclusions cannot in principle do so: a quantum effect cannot be found where there is no quantum structure. Finally, a simple simulation which demonstrates the classical (electromagnetic) generation of the data that violates a Bell Inequality, thereby proving by counterexample that Bell’s so-called theorem is misunderstood, is presented.
Effect of Severe Temperatures and Restraint on Instability and Buckling of Elliptical Steel Columns  [PDF]
F. Ali, A. Nadjai
Open Journal of Civil Engineering (OJCE) , 2018, DOI: 10.4236/ojce.2018.81004
Abstract: This paper presents the findings of an experimental research to investigate the performance of axially restrained elliptical hollow (EHS) steel columns subjected to severe hydrocarbon fire. The test programme involved 12 steel columns presenting 2 oval sections 200×100×8mm and 300×150×8mm and yielding 2 slenderness?λ?= 51 and 33. The 1800mm columns were tested under loading ratios ranging between 0.2 and 0.6 of the ultimate strength determined using EC3 and under axial restraint degree ranging from 0 to 0.16.? The obtained results of axial displacements, lateral displacements, measured restraint forces, and high temperatures are presented in the paper. It was found that introducing restraint to the columns with elliptical section produces high restraint forces which reduce the time to lose lateral stability. This is more evident in cases of lower load ratios than the higher load ratios. The numerical study presented in this paper involved building a finite element model to simulate the columns behaviour in fire. The model was validated using the test results obtained from unrestrained and restrained columns fire tests. The model demonstrated good agreement in the prediction of failure times and failure mechanisms of local and overall buckling. The FEM model was then used to conduct a parametric analysis involving factors of slenderness, restraint and loading. The conclusions drawn for this
Interval Based Analysis of Bell’s Theorem  [PDF]
F. P. Eblen, A. F. Barghouty
Journal of Modern Physics (JMP) , 2019, DOI: 10.4236/jmp.2019.106041
Abstract: This paper introduces the concept and motivates the use of finite-interval based measures for physically realizable and measurable quantities, which we call -measures. We demonstrate the utility and power of -measures by illustrating their use in an interval-based analysis of a prototypical Bell’s inequality in the measurement of the polarization states of an entangled pair of photons. We show that the use of finite intervals in place of real-numbered values in the Bell inequality leads to reduced violations. We demonstrate that, under some conditions, an interval-based but otherwise classically calculated probability measure can be made to arbitrarily closely approximate its quantal counterpart. More generally, we claim by heuristic arguments and by formal analogy with finite-state machines that -measures can provide a more accurate model of both classical and quantal physical property values than point-like, real numbers—as originally proposed by Tuero Sunaga in 1958.
Semiparametric Estimator of Mean Conditional Residual Life Function under Informative Random Censoring from Both Sides  [PDF]
A. A. Abdushukurov, F. A. Abdikalikov
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.62030
Abstract: In this paper we study estimator of mean residual life function in fixed design regression model when life times are subjected to informative random censoring from both sides. We prove an asymptotic normality of estimators.
A Robust Method to Detect Hidden Data from Digital Images  [PDF]
Romany F. Mansour, W. F. Awwad, A. A. Mohammed
Journal of Information Security (JIS) , 2012, DOI: 10.4236/jis.2012.32011
Abstract: Recently, numerous novel algorithms have been proposed in the fields of steganography and visual cryptography with the goals of improving security, reliability, and efficiency. Steganography detection is a technique to tell whether there are secret messages hidden in images. The performance of a steganalysis system is mainly determined by the method of feature extraction and the architecture selection of the classifier. In this paper, we present a new method Visual Pixel Detection VPD for extract data from a color or a grayscale images. Because the human eye can recognize the hidden information in the image after using this detection. The experimental results show that the proposed method provides a better performance on testing images in comparison with the existing method in attacking Steghide, Outguess and F5.
Seed Morphology of Some Species of Indigofera (Fabaceae) from Saudi Arabia (Identification of Species and Systematic Significance)  [PDF]
F. A. Al-Ghamdi
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.23057
Abstract: Seeds of 18 species of Indigofera L. were examined with the scanning electron microscope and the light microscope. Macro- and micromorphological characters, including seed shape, colour, size, surface, epidermal cell shape, anticlinal boundaries, outer periclinal cell wall and relief of outer cell walls, are presented. Two types of basic anticlinal cell wall boundaries and two types of relief outer cell walls are recognized and two different shapes of the outer periclinal cell wall are described. A key for the identification of the investigated taxa based on seed characters is provided.
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