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Search Results: 1 - 10 of 910 matches for " Shamsuddin Shahid "
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Geographic Information System for the Evaluation of Groundwater Pollution Vulnerability of the Northwestern Barind Tract of Bangladesh
Shamsuddin Shahid,Manzul Kumar Hazarika
Environmental Research Journal , 2012,
Abstract: Groundwater is the main source of drinking in the northwestern Barind region of Bangladesh. Therefore, prevention of this resource to pollution is crucial to avoid probable health and environmental hazards. An attempt has been taken in this study to map the vulnerability of the groundwater resource to contamination based on a multi-criteria approach known as DRASTIC within a geographic information system. Seven thematic maps of DRASTIC parameters are developed from available soil, borehole litholog, groundwater fluctuations and elevation model data of the region. The maps are integrated within geographic information system to generate the maps of groundwater vulnerability to both agricultural pollutants and general pollutants. The pollution vulnerability maps are validated with existing groundwater quality data. The result shows that almost 38.1% of the area is highly vulnerable to agricultural pollutants and 29.8% to general pollutants. Some management strategies are proposed for the protection of groundwater resource from pollution.
Effects of El Nino Southern Oscillation on the Discharge of Kor River in Iran
Morteza Mohsenipour,Shamsuddin Shahid,M. J. Nazemosadat
Advances in Meteorology , 2013, DOI: 10.1155/2013/846397
Abstract: The objective of the study was to investigate the El Nino forcing on the discharge of Kor River located in Maharloo-Bakhtegan basin in the Fars province of Iran. Thirty-one-year (1965–1995) and twenty-year (1975–1995) monthly mean river discharge data recorded at two stations, namely, Chamriz and Dehkadeh-Sefid, respectively, were chosen in the present study. Fourier analysis was used to extract harmonic information of time series data such as amplitude and phase angle to show the maximum effect and the time of effect of El Nino on river discharge. The study revealed that El Nino events caused increase of discharge in Kor River by 15% to 20% and the maximum influence was in the months of February and March in El Nino years. 1. Introduction In normal condition, the temperature of ocean surface in the east of southern Pacific Ocean is lower than the temperature of surface water in the west of southern Pacific Ocean. Therefore, a high pressure zone and a low pressure zone dominate in the east and the west of the southern Pacific Ocean, respectively [1]. The difference between high and low pressure zones causes wind blowing, namely, trade wind or easterlies. The direction of wind is from the east to the west of Pacific Ocean. Therefore, trade wind causes the movement of surface warm water in equatorial region from the east to the west. During El Nino period, the temperature of surface water in the west is lower than the temperature of surface water in the east of southern Pacific Ocean. This large-scale pressure seesaw in Pacific Ocean is called Southern Oscillation (SO). Therefore, the direction of trade wind and also warm water changes from the west to the east. Existing warm water pool in the coast of Peru and Southern Ecuador is the sign of El Nino [1, 2]. The two phenomena, El Nino and Southern Oscillation, together are known as ENSO. The relationship between El Nino and some parameters such as temperature, rainfall, and discharge was investigated in different parts of the world. Their results have showed that El Nino causes floods and droughts on different parts around the world [3, 4]. Cayan and Peterson [5], Kahya and Dracup [6], Zhang et al. [7], Ward et al. [8], Cahoon [9], Osman and Abdellatif [10], Mu?oz-Salinas and Castillo [11], Wang and Eltahir [12], Simpson et al. [13], Kahya, and Karab?rk, [14], and many other researchers conducted the impact of El Nino on the discharge. Cayan and Peterson [5] predicted discharge anomalies in the Western United States in two seasons by using Southern Oscillation Index (SOI). Zubair [15] investigated the
Comparison of different methods in estimating potential evapotranspiration at Muda Irrigation Scheme of Malaysia
Nurul Nadrah Aqilah Tukimat,Sobri Harun,Shamsuddin Shahid
Journal of Agriculture and Rural Development in the Tropics and Subtropics , 2012,
Abstract: Evapotranspiration (ET) is a complex process in the hydrological cycle that influences the quantity of runoff and thus the irrigation water requirements. Numerous methods have been developed to estimate potential evapotranspiration (PET). Unfortunately, most of the reliable PET methods are parameter rich models and therefore, not feasible for application in data scarce regions. On the other hand, accuracy and reliability of simple PET models vary widely according to regional climate conditions. The objective of the present study was to evaluate the performance of three temperature-based and three radiation-based simple ET methods in estimating historical ET and projecting future ET at Muda Irrigation Scheme at Kedah, Malaysia. The performance was measured by comparing those methods with the parameter intensive Penman-Monteith Method. It was found that radiation based methods gave better performance compared to temperature-based methods in estimation of ET in the study area. Future ET simulated from projected climate data obtained through statistical downscaling technique also showed that radiation-based methods can project closer ET values to that projected by Penman-Monteith Method. It is expected that the study will guide in selecting suitable methods for estimating and projecting ET in accordance to availability of meteorological data.
Intelligent Dynamic Aging Approaches in Web Proxy Cache Replacement  [PDF]
Waleed Ali, Siti Mariyam Shamsuddin
Journal of Intelligent Learning Systems and Applications (JILSA) , 2015, DOI: 10.4236/jilsa.2015.74011
Abstract: One of commonly used approach to enhance the Web performance is Web proxy caching technique. In Web proxy caching, Least-Frequently-Used-Dynamic-Aging (LFU-DA) is one of the common proxy cache replacement methods, which is widely used in Web proxy cache management. LFU-DA accomplishes a superior byte hit ratio compared to other Web proxy cache replacement algorithms. However, LFU-DA may suffer in hit ratio measure. Therefore, in this paper, LFU-DA is enhanced using popular supervised machine learning techniques such as a support vector machine (SVM), a naive Bayes classifier (NB) and a decision tree (C4.5). SVM, NB and C4.5 are trained from Web proxy logs files and then intelligently incorporated with LFU-DA to form Intelligent Dynamic- Aging (DA) approaches. The simulation results revealed that the proposed intelligent Dynamic- Aging approaches considerably improved the performances in terms of hit and byte hit ratio of the conventional LFU-DA on a range of real datasets.
Solution of Some Integral Equations Involving Confluent k-Hypergeometric Functions  [PDF]
Shahid Mubeen
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.47A003
Abstract: The principle aim of this research article is to investigate the properties of k-fractional integration introduced and defined by Mubeen and Habibullah [1],and secondly to solve the integral equation of the form\"\"
, for k > 0, β > 0, y > 0, 0 < x < t < ∞,  where \"\" is the confluent k-hypergeometric functions, by using k-fractional integration.
Symmetrical Palladium (II) N,N,O,O-Schiff Base Complex: Efficient Catalyst for Heck and Suzuki Reactions  [PDF]
Wan Nazihah Wan Ibrahim, Mustaffa Shamsuddin
Crystal Structure Theory and Applications (CSTA) , 2012, DOI: 10.4236/csta.2012.13005
Abstract: Palladium is arguably the most versatile and most widely applied catalytic metal in the field of fine chemicals due to its high selectivity and activity. Palladium catalyst offers an abundance of possibilities of carbon-carbon bond formation in organic synthesis. In this research, three different Schiff base ligands have been prepared by condensation reaction between appropriate aldehyde or ketone with amine namely 2,2-dimethyl-1,3-propanediamine in the molar ratio of 2:1. The corresponding palladium (II) Schiff base complexes were prepared through the reaction between the Schiff base ligand with palladium (II) acetate in a molar ratio 1:1. FTIR, 1H-NMR and 13C-NMR spectroscopic data revealed that the ligands are N,N,O,O-tetradentate coordinated to the Pd atom through both the azomethine N atoms and phenolic O atoms. From X-ray Crystallographic analysis, it showed that the complex exists as square planar geometry. The synthesized palladium (II) Schiff base complexes were then subjected in catalytic Heck and Suzuki reaction of iodobenzene.
Retinal Muller Glia Initiate Innate Response to Infectious Stimuli via Toll-Like Receptor Signaling
Ashok Kumar, Nazeem Shamsuddin
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0029830
Abstract: Ocular surgeries and trauma predispose the eye to develop infectious endophthalmitis, which often leads to vision loss. The mechanisms of initiation of innate defense in this disease are not well understood but are presumed to involve retinal glial cells. We hypothesize that retinal Muller glia can recognize and respond to invading pathogens via TLRs, which are key regulators of the innate immune system. Using the mouse retinal sections, human retinal Muller cell line (MIO-M1), and primary mouse retinal Muller cells, we show that they express known human TLR1-10, adaptor molecules MyD88, TRIF, TRAM, and TRAF6, and co-receptors MD2 and CD14. Consistent with the gene expression, protein levels were also detected for the TLRs. Moreover, stimulation of the Muller glia with TLR 2, 3, 4, 5, 7 and 9 agonists resulted in an increased TLR expression as assayed by Western blot and flow cytometry. Furthermore, TLR agonists or live pathogen (S. aureus, P. aeruginosa, & C. albicans)-challenged Muller glia produced significantly higher levels of inflammatory mediators (TNF-α, IL-1β, IL-6 and IL-8), concomitantly with the activation of NF-κB, p38 and Erk signaling. This data suggests that Muller glia directly contributes to retinal innate defense by recognizing microbial patterns under infectious conditions; such as those in endophthalmitis.
Phytoremediation of heavy metals with several efficiency enhancer methods
A Karami, ZH Shamsuddin
African Journal of Biotechnology , 2010,
Abstract: It is no doubt that the contamination of water, air and soil has worsened, and this occurs as a result of the increase in population. However, the need for remediation technologies has to be seriously considered. Phytoremediation is one of the remediation techniques with a relatively slow procedure and low efficiency. This review covers some of the biological, chemical, physical, physico-chemical and genetic methods, which were applied in parallel with phytoremediation, in an attempt to help increase the efficiency in the remediation of air, soil and water. These include lowering the pH and increasing the electrode potential (Eh), as well as using chelating agents and micro-organisms (arbuscular mycorrhizal fungi (AMF) and plant growth promoting rhizobacteria (PGPR)).Among the introduced methods, an appropriate application of the PGPRs is one of the most useful and environmentally friendly techniques which is currently considered as a useful process in phytoremediation. As a result of the discovering of these new methods, multi-approaches have been executed for a faster and higher removal rate of the contaminants, with a consequent increase in the efficiency of phytoremediation, as compared to single techniques.
Resolvent Dan Penggunaannya Dalam Mendapatkan Vektoreigen Dan Nilaieigen Suatu Spektrum Yang Diskrit Dengan Melibatkan Usikan Bagi Masalah Tak Degenerat
Shamsuddin bin Ahmad
Matematika , 1985,
Abstract: Teori asas Resolvent dibentangkan. Dari bentuk perwakilan spektranya ia dikembangkan dalam bentuk siri Laurent sebelum digunakan untuk mencari nilaieigen dan vektoreigen.
Socio-maternal risk factors of ADHD among Iraqi children: A case-control study  [PDF]
Hussain R. Saadi, Khadijah Shamsuddin, Rosnah Sutan, Serene A. Alshaham
Open Journal of Preventive Medicine (OJPM) , 2013, DOI: 10.4236/ojpm.2013.32034
Abstract:

Background: Attention-deficit hyperactivity disorder (ADHD) is a chronic disorder that appears first in childhood at preschool age (4 - 5) years, and is manifested by a symptomatic pattern of difficulties with attention, motor activity and impulsivity. Maternal factors like stress, socio-demographic and maternal life style factors are potential risk factors for ADHD. Methodology: A retrospective case-control study was conducted in Baghdad-Iraq. Cases have been taken from 5 private paediatric clinics. Controls were chosen from kindergartens within the same residential area of the paediatric private clinics. Mothers of cases and controls were investigated for the risk factors of ADHD using a self-administered questionnaire. The total sample size was 260. Number of cases was 130 and number of controls was 130. Results: Five variables were significantly associated with development of ADHD after using a multivariate logistic regression model, maternal war stress (Adjusted OR 9.08, 95% CI 4.70 - 17.52 and P value < 0.001), maternal smoking (Adjusted OR 3.27 95% CI 1.40 - 7.63, P < 0.001), father lost job (Adjusted OR 2.81, 95% CI 1.51 - 5.24, P value < 0.001), and house damaged (Adjusted OR 2.55, 95% CI 1.04 - 6.24, P < 0.05). Family income was also associated with risk of ADHD (OR 1.02 95% CI 1.00 - 3.12, P value < 0.05). Conclusion and suggestion: Maternal exposure to war stress has 9 times higher risk of developing ADHD among offspring. This study aimed to offer to the policy makers a good benchmark to plan more programmes related to women and child health with respect to the fourth and fifth Millennium Development Goals (MDGs) in reduction of child mortality and morbidity and improvement of maternal health. There is a real necessity to address the need of vulnerable pregnant mothers at war and disaster’s time for programmes which will be able to control the stress that those pregnant mothers would encounter during those hard times.

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