• 
• 
• 
• Browse by Subjects
• Publications A-Z index

1.

On Irresolute Topological Vector Spaces-II Muhammad Asad Iqbal, Muhammad Maroof Gohar, Moiz ud Din Khan Turkish Journal of Analysis and Number Theory. 2016 4 (2). doi: 10.12691/tjant-4-2-2 Keywords: topological vector space, irresolute topological vector space, irresolute Mapping , semi open set Context: In this paper, we continue the study of Irresolute topological vector spaces. Notions of convex, bounded and balanced set are introduced and studied for Irresolute topological vector spaces. Along with other results, it is proved that: 1. Irresolute topological vector spaces are semi-Hausdorff spaces. 2. Every Irresolute topological vector space is semi-regular space. 3. In Irresolute topological vector spaces, as well as is convex if is convex. 4. In Irresolute topological vector spaces, is bouned if is bounded. 5. In Irresolute topological vector spaces, is balanced if is balanced and 6. In Irresolute topological vector spaces, every semi compact set is bounded. Abstract Full Text (PDF) [Epub] Full Text (HTML)

2.

Effect of Evaporation or Infiltration on the Free Surface of Groundwater in Certain Problems of Underground Hydromechanics E. N. Bereslavskii American Journal of Applied Mathematics and Statistics. 2017 5 (5). doi: 10.12691/ajams-5-5-1 Keywords: filtration, infiltrations, evaporation, groundwater, free surface, tongue of Zhukovsky, Polubarinova-Cochina’s method, complex velocity, conformal Mapping s, Fuchsian equation Context: Within the framework of the theory of plane steady filtration of an incompressible fluid according to Darcy’s law, two limiting schemes modeling the filtration flows under the Joukowski tongue through a soil massive spread over an impermeable foundation or strongly permeable confined water bearing horizon are considered. Abstract Full Text (PDF) [Epub] Full Text (HTML)

3.

Contribution to the Assessment of the Quality of the Drilling Waters of the Regions of Lobaye and Ombella - Mpoko in the South - West of the Central African Republic Foto Eric, Allahdin Oscar, Biteman Olga, Akpekabou Brandon, Poumaye Nicole Journal of Environment Pollution and Human Health. 2022 10 (1). doi: 10.12691/jephh-10-1-3 Keywords: drilling water, Mapping , water quality, chemical facies Context: Drilling water consumed in the South-West of the Central African Republic is the main source of drinking water. However, the chemical and bacteriological quality of these resources remains unclear. This study allowed us to classify the boreholes in the region according to their chemical and bacteriological quality in order to assess the risks associated with their consumption. The results obtained showed that the boreholes have an acidic pH and are weakly mineralized. Three chemical facies have been identified from the piper diagram which are calcium and magnesium bicarbonate, chloride and calcium sulfate, finally magnesium and sodium and potassium chloride. The mineralization of these boreholes is influenced by the nature of the rocks, in particular the carbonates, granites, clays and shales present in the region and also the external inputs due to the leaching of the soil. The results of bacteriological analyzes show the presence of fecal contamination germs in certain boreholes. The study revealed three quality classes: first class for good quality drilling water, which meets WHO standards, second class for acceptable quality water and third class for poor quality water. Abstract Full Text (PDF) [Epub] Full Text (HTML)

4.

A Unique Common Fixed Point Theorem for a Metric Space with the Property (E.A) K. Prudhvi American Journal of Applied Mathematics and Statistics. 2023 11 (1). doi: 10.12691/ajams-11-1-2 Keywords: fixed point, common fixed point, property (E. A), weakly compatible Mapping s Context: In this paper, we prove a unique common fixed point theorem for metric space with (E.A) property. Our result is a generalization and improvement of some recent results existing in the literature [1]. Abstract Full Text (PDF) [Epub] Full Text (HTML)

5.

Spatial Distribution of Food Poverty Incidence in Juba Town: A geo-statistical Assessment David Lomeling, Rita Nyoka Wani Journal of Food Security. 2015 3 (1). doi: 10.12691/jfs-3-1-3 Keywords: daily calorie intake, dietary diversity, food security, food poverty Mapping , Gini coefficient, isotropic variogram Context: Food and nutrition security survey based on a representative sample of the population of Juba Town was conducted from October to November 2010. The survey covered four localities: Gudele, Juba na Bari, Kator and Munuki. Daily calorie intake using a one day 24-hour diet recall varied between 500 to 3,500 Kcal as a function of monthly income. Spatial distribution of food poverty incidence as well as daily calorific values were geo-statistically analyzed using a GS+TM Version 9 software. Results showed that about 13.2% of the households with incomes less than 500 SDG/month were severely food insecure with constant hunger,41.5% of the households with incomes between 350-800 SDG/month were food insecure with moderate hunger; 35.8% of the households with incomes between 850-1850 SDG/month were food insecure but without hunger; and 9.4% of the households with incomes between 1,850 and 4,000 SDG/month were food secure. Isotropic variogram of food poverty incidence showed a 46.6% moderate spatial dependency with a relatively low correlation coefficient of r2=0.15 and a range A0 of 8.8 km suggesting a wide radius of even food poverty levels across much of Juba Town. Meanwhile the estimated daily per capita calorific values also showed moderate spatial dependency of 60.3% and a small range A0at 2.3 km. Food poverty incidence at low correlation coefficient r2=0.02 positively correlated with family size and negatively correlated at r2=0.17 with the per capita food consumption. Monetary indicator was used to assess food poverty with the Gini coefficient at 0.32. This unequal income distribution suggested the vulnerability of most households to food insecurity. However, most low income households with less freedom of choice easily compensated their dietary diversity and calorific values through appropriate food preparation methods. Abstract Full Text (PDF) [Epub] Full Text (HTML)

6.

Spatial Assessment of Heat Stress Impact on Rice Production in Two Districts of Andhra Pradesh, India T. D. Setiyono, M. Barbieri, P. Prasadini, A. Maunahan, L. Gatti World Journal of Agricultural Research. 2018 6 (1). doi: 10.12691/wjar-6-1-3 Keywords: rice, heat stress, Mapping , rice production, remote sensing, crop simulation model Context: Physiological studies have provided clear evidence of heat-induced spikelet sterility in rice, which can cause significant yield reductions. However, it is rather difficult to evaluate such yield losses in real world situations in farmers’ fields, especially across large areas. State-of-the-art technologies, such as remote sensing and crop modeling, can offer solutions for evaluating the heat-induced yield penalty in rice across a spatial area. Remote-sensing technologies, especially Synthetic Aperture Radar (SAR), can provide spatial detection of the start of the rice-growing season. This information, combined with time-series temperature data, can be assimilated into a crop simulation model, which can provide a thorough assessment of any heat-induced yield penalty over a specific geographic region. In this paper, we demonstrate how SAR can be used to assess the effects of heat stress in rice in two districts of Andhra Pradesh, India, during the 2017 rabi (dry) season. The accumulated data suggest that 53,623 and 21,436 ha of rice fields in Nellore and West Godavari districts, respectively, had yield losses due to heat stress. Rice fields in Nellore suffered higher yield and production losses due to heat stress because of steeper trend of increasing temperatures during the rice plants’ reproductive stage. Abstract Full Text (PDF) [Epub] Full Text (HTML)

7.

g-reciprocal Continuity in Symmetric Spaces Arvind Bhatt American Journal of Mathematical Analysis. 2013 1 (3). doi: 10.12691/ajma-1-3-3 Keywords: fixed point theorems, symmetric spaces, g-reciprocal continuity, noncompatible Mapping s, g-compatible Context: In this paper, we obtain a common fixed point theorem by employing the notion of g-reciprocal continuity in symmetric spaces. We demonstrate that g-reciprocal continuity ensures the existence of common fixed point under strict contractive conditions, which otherwise do not ensure the existence of fixed points. Abstract Full Text (PDF) [Epub] Full Text (HTML)

8.

The Mechanics of Civil –Works Induced Gully Erosion: Applications to Development of Preventive Measures in South Eastern Nigeria Godwin I. Nwankwor, Ubong P. Udoka, Boniface C. Egboka, Alex I. Opara Applied Ecology and Environmental Sciences. 2015 3 (2). doi: 10.12691/aees-3-2-5 Keywords: Mapping , erosion control, risk, flood, gully erosion control, Imo state, road construction, land use land cover mapping Context: Evidence from a comparative analysis of shear strength of surficial sediments and shear stress of runoff for various flow depths and natural slopes in parts of South- Eastern Nigeria indicate that these sediments are really not as highly erodible as it is presently believed. The shear strength of top soils range from 5 to 60kN/m2, and are higher than shear stress of runoff which ranges from 0.07 kN/m2 to 14 kN/m2 for flow depths of up to 5cm and slope angles of about 200 both of which rarely occur in nature. Soil erosion should not constitute a major problem in this region. The problem of soil erosion in our environment is primarily due to the reckless removal of top soil and activities that tend to concentrate runoff. It is thus necessarily due to high erodibleness of soils, but rather as a result of our unwillingness to help these soils sustain our development. It is shown that implementation of simple and cost effective designs in our roads layout, and other related civil engineering works can considerably reduce soil erosion problems in the area. The efficacy of the technique to curb the incidence of erosion is examined within the context of hydrological and runoff- water routing functions of the design components. Implementation of these techniques will not only minimize environmental hazards and keep erosion in near total check, but will also add an aesthetic component to our environment. Abstract Full Text (PDF) [Epub] Full Text (HTML)

9.

Investigation in Adjusting the Parameters of a Diesel Engine Converted to Forced Aspiration Gas Engine Rachid Maamri, Fedor Ivanovitsh Abramtshuk, Alexandre Nikolaevitsh Kabanov, Mekhael Sergeevitsh Lipinsky, Yves Dubé, Lotfi Toubal, Agbossou Kodjo American Journal of Vehicle Design. 2013 1 (1). doi: 10.12691/ajvd-1-1-2 Keywords: combustion, wiebe combustion factor, mathematical model, natural gas, engine Mapping Context: Many cities and countries today have programs to convert older, polluting diesel transit buses and trucks to run on clean, economical natural gas. Properly implemented, this is an excellent way to quickly reduce fuel costs, clean up the air and reduce noise with minimum capital costs. A poorly executed conversion program, however, can lead to higher exhaust emissions, much higher fuel consumption, unacceptable power losses, poor durability and high maintenance costs. This article gives the results of our investigation of a forced aspiration gas engine 6GCHN13/14 converted from diesel. The mathematical model of the combustion process specified for the gas engine uses a variable Wiebe combustion factor. Use of the developed characteristic maps has shown improvement of engine power indicators in comparison with that of a naturally aspirated engine, as well as a decrease in average operational emissions with the use of adjustable forced aspiration. Abstract Full Text (PDF) [Epub] Full Text (HTML)

10.

Generalization of Fixed Point Theorems in Pseudocompact Tichonov Space Mumtaz Ali, Muhammad Arshad Turkish Journal of Analysis and Number Theory. 2017 5 (5). doi: 10.12691/tjant-5-5-3 Keywords: contraction Mapping , fixed point, pseudocompact Tichnovo space. Context: In this paper we study some fixed point results in pseudocompact Tichnovo space using Edelstein type contractive conditions. The results presented in this paper include the generalization of some fixed point theorems established by Fisher and Pathak. Abstract Full Text (PDF) [Epub] Full Text (HTML)