Open Access Original Research Article

The Coupling Conduction Effects on Natural Convection Flow along a Vertical Flat Plate with Joule Heating and Heat Generation

Md. M. Alam, Md. Saddam Hossain, M. M. Parvez, Irin Rahman

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/CJAST/2018/40125

The out-turn of heat generation and Joule heating on natural convection flow through a vertical flat plate have been investigated in the given article. Joule heating and heat conduction due to wall thickness ‘b’ are esteemed as well in this analysis. With the intent to obtain similarity solutions to the problem being constituted, the evolved equations are made dimensionless employing appropriate transformations. The non-dimensional equations are then modified into non-linear equations by bringing into being a non-similarity transformation. The out-turn non-linear alike equations confine with their commensurate boundary conditions formed on conduction and convection are solved numerically applying the finite difference method accompanied by Newton’s linearization approximation. The numerical outcomes in terms of the skin friction coefficient, velocity, temperature, and surface temperature profiles are shown both graphically and in tabular forms for the different values of the parameters correlated with the problem.

 

Open Access Original Research Article

Optimum Selection of a Lattice Central’s Tower for a Heliostat’s Field

A. Vera Murillo, Jaime Horta Rangel, Luz Perez Rea, Teresa Lopez Lara, Juan Hernandez Zaragoza, Eduardo Rojas Gonzalez

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/CJAST/2018/40586

The lattice structure optimization is based on the modification of three parameters: sizing, configuration and topology. Sizing is about the cross-sectional area of each element, configuration delimits the position of each node and topology is the structural shape that can be made by the position of the elements. The topology is essential in order to obtain not only a minimum weight, but also a structure with an efficient use of its free spaces, with an easy way to be built, with minor costs of production and transportation and with a modular construction. Before the use of a sizing and configuration optimization, the election of the best topology is useful as a pre-optimization.

Thinking about the factors before mentioned, three structural shapes (topologies) were used in mathematical models of steel towers. These three were elaborated with the same requests and total loads. The model “A” has the same topology than experimental Solar-Plant in Sonora. The model “B” has a hexagonal shape simulating a double spatial grid. Model “C” has a hexagonal shape with a structure based in lateral restricted frames. The topologies were analyzed by the Mexican constructive steel standards. All models were compare in terms of their solar efficiency, building time, weight, displacement allowed, quantity and length of members, capability of been a modular structure and their characteristics to be optimized. The better topology is the one that uses the hexagonal shape with lateral restricted frames. It has the minimum weight, this has better characteristics to be optimized, members easily of being transportable and better behavior in solar efficiency.

Open Access Original Research Article

Forecasting Currency in Circulation in Malaysia Using ARCH and GARCH Models

Nur Azreen Abdul Razak, Azme Khamis, Mohd Asrul Affendi Abdullah, Suliadi Firdaus Sufahani

Current Journal of Applied Science and Technology, Page 1-5
DOI: 10.9734/CJAST/2018/40358

The monthly economic time series commonly contains the volatility periods and it is suitable to apply the Heteroscedastic model to it where the conditional variance is not constant throughout the time trend. The aim of this study is to model and forecast the currency in circulation (CIC) in Malaysia over the time period, from January 1998 to January 2016. Two methods are considered, which are Autoregressive Conditional Heteroscedastic (ARCH) and Generalized Autoregressive Conditional Heteroskedasticity (GARCH). Using the Root Mean Square Error (RMSE) as the forecasting performance measure, this study concludes that GARCH is a more appropriate model compared to ARCH.

Open Access Original Research Article

Evaluation of Serum Mercury and Microalbuminuria in Sudanese Traditional Gold Miners in Northern State

Khalid Khaber Khalid, Mariam Abass Ibrahim, M. A. Fattah, Shoeb Qureshi, Tarig Karar

Current Journal of Applied Science and Technology, Page 1-8
DOI: 10.9734/CJAST/2018/41119

Traditional (Artisanal) gold mining is of global health concern; there is little available information about the health problems in gold traditional mining in Sudan. This study aimed to evaluate of serum mercury and microalbuminuria in Sudanese traditional gold miners. A total of 60 male miners (30 workers used or exposed to mercury and 30 workers used cyanide and exposed briefly to the mercury mixture with soil) as well as 30 male controls, in northern state of Sudan during March to May 2016. Mercury was analyzed by using standard technique atomic absorption spectrophotometer, and microalbuminuria was analyzed by semi-quantitative chromatographic immunoassay. The result we found significant increase in mercury levels in traditional gold miners, when compared with their control group but no significant difference when compared age between traditional miners and control group P Value=0.90, we also  found significant increase in mercury levels in traditional gold miners compared with company gold miners but no significant difference when compared age between traditional miners and company gold miners P Value=0.070, there was significant increase in mercury levels in company gold miners, when compared with their control group, also no significant difference when compared age between company gold miners and control group P Value =0.131), there were significant increase in mercury levels in inhalation route traditional miners, when compared with skin contact route traditional miners, there is significant increase in mercury levels in abnormal renal function of traditional gold miners compared with mercury levels in normal renal function of traditional gold miners. This study concludes that, serum mercury levels are significantly increased in traditional gold miners, working in Kodorma area in comparison to non-exposed subjects and mining company workers used cyanide.

Open Access Original Research Article

In vitro Callussing of Carnation (Dianthus caryophyllus L.) cv. Scania and Indios

Z. A. Qadri, N. H. Masoodi, Ambreena Din, Muneeb Ahmad Wani

Current Journal of Applied Science and Technology, Page 1-10
DOI: 10.9734/CJAST/2018/39618

An experiment was conducted to standardize the protocol for in vitro callusing of two carnation (Dianthus caryophyllus L.) cultivars viz., ‘Scania’ and ‘Indios’. Different explants tried were leaf segments, nodal segments, shoot tips and apical shoots. Apical shoots were also used with or without leaves, besides nodal segments from two environments i.e., open field and polyhouse. Among all explants leaf segments and nodal segments proved best for callusing in both the cultivars. MS  medium supplemented with BAP 1.00 + 2, 4-D 2.00 mg l-1 resulted in best callusing of leaf and nodal segment explants in terms of minimum days to callus initiation, maximum callus induction and callus weight per explant in both the cultivars. Minimum time (10.50  and 8.33 days) to callus initiation , highest callus induction of 91.66 and 91.00 per cent and significantly maximum mean callus weight 2.15 and 2.52 g explant-1  was recorded in media fortified with BAP 1.00 + 2, 4-D 2.00 mg l-1 in case of leaf  and nodal segment explant of scania while as BAP 1.00 mg l-1 + 2,4-D 2.00 mg l-1 took lowest (12.00 and 8.00) days for initiation of callusing , 85.00 and 89.00 per cent for callus induction , and significantly maximum mean callus weight 1.93 and 2.14 g explant-1in leaf and nodal segment explants of cv. ‘Indios’.

Open Access Original Research Article

Thermal Stress Induced Alterations in Tissue Protein, Lipid Peroxidation and Activities of Lactate Dehydrogenase, Acetylcholinesterase and Catalase in the Earthworm Eudrilus eugeniae (Kinberg)

C. S. K. Mishra, Soumya Sucharita Parida, Kumari Poornima Mohanta, Suryasikha Samal

Current Journal of Applied Science and Technology, Page 1-8
DOI: 10.9734/CJAST/2018/41230

Aim: To evaluate the effects of different temperatures exposures on tissue protein and certain stress indicating enzymes of the earthworm Eudrilus eugeniae.

Methodology: The tissue protein content, lipid peroxidation (LPX) level and activities of lactate dehydrogenase (LDH), acetylcholinesterase (AChE), catalase were studied in the earthworms exposed to 4°C, 30°C, 35°C and 40°C for 15 and 30 minutes durations using a standard protocol.

Results: The highest tissue protein (216.64 mg/g tissue) was recorded at 35°C with 30 min exposure and the lowest (123.19 mg/g tissue) at 4°C with 15 min exposure. LDH activity was the highest (0.14 U/mg protein) at 35°C with 15min exposure and the lowest (0.006 U/mg protein) at 30°C. The maximum AChE activity (0.029 U/mg protein) was observed at 30°C with 15min exposure and the minimum (0.005 U/mg protein) at 35°C with 30 min exposure respectively. LPX level was the highest (0.15 nmol/mg protein) at 4°C with 30min exposure and lowest (0.07 nmol/mg protein) at 35°C with 30 min exposure. Catalase activity was the maximum (0.11 U/mg protein) at 30°C with 15 min exposure and minimum (0.02 U/mg protein) at 35°C with 15 min exposure.

Conclusion: The study indicated that tissue protein; LPX level and enzyme activities could be useful biomarkers to study the organismal impact of thermal stress due to climate change.

Open Access Review Article

Image Analysis: A Modern Approach to Seed Quality Testing

Hemender ., Sushma Sharma, V. S. Mor, Axay Bhuker

Current Journal of Applied Science and Technology, Page 1-11
DOI: 10.9734/CJAST/2018/40945

Image analysis is a state-of-the-art technique for seed quality testing. This tool provides vast usage in evaluation of various physiological and morphological characteristics of the seed with a more comprehensive perception. It is based on the extraction of numerical data from a captured image for characteristics like colour, size, shape of seed and seedlings and their subsequent processing with the help of suitable computer software. Speedy analyses, cost-effectiveness, automatic nature and user-friendly environment for work are some important advantages of Image Analysis over other conventional techniques. Numerous software have been developed for application in different fields of seed science research like germination studies, vigour estimation, varietal identification and purity testing etc. and most of these showed their potential adoption in the future as such or with some required transformations.