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OALib Journal期刊

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Effect of Cadmium Repartition on Nitrogen Metabolism in Tobacco Seedlings  [PDF]
Houda Maaroufi Dguimi, Khulud Alshehri, Chokri Zaghdoud, Ali Khalaf Albaggar, Mohamed Debouba
Open Access Library Journal (OALib Journal) , 2019, DOI: 10.4236/oalib.1104000
Abstract:
Thirty-day-old tobacco seedlings (Nicotiana tabaccum, Bureley v) were subjected during one week to increasing cadmium (Cd) concentrations (0, 10, 20, 50 and 100 μM CdCl2). Increasing Cd stress led to a gradual decrease of dry weight (DW) production, water and nitrate contents. More than the half of Cd accumulated per plant was sequestered in the oldest leaf stage (S1 leaves). Leaves from S1 were the least affected by Cd stress. The activities of nitrate reductase (NR, EC 1.6.1.6), nitrite reductase (NiR, EC 1.7.7.1) were the least reduced in S1 leaves despite of the high presence of Cd ions. At 100 μM Cd, glutamine synthetase activity (GS, EC 6.3.1.2) from S1 leaves rose to become 2 times more important than control. Western Blot analysis showed that S1 GS activity induction was correlated to the GS1 and GS2 protein accumulation. Young leaves (S3 leaves) were more affected by Cd stress than old leaves. The GS activity reduction in S3 leaves was correlated to GS2 protein decrease detected by western-blot analysis. So, tobacco plant accumulated Cd ions in old leaves (S1 leaves) to protect younger leaves which are more sensitive to Cd effects. Leaves from S1 are a target organ to verify an eventual soil contamination per cadmium. This leaves may evolve adaptive process to partially inactivate Cd ions and maintain stable rate of nitrogen metabolism.
Preparation and Characterization of Oligomer from Recycled PET and Evaluated as a Corrosion Inhibitor for C-Steel Material in 0.1 M HCl  [PDF]
Ali H. Yasir, Alaa S. Khalaf, Moayad N. Khalaf
Open Journal of Organic Polymer Materials (OJOPM) , 2017, DOI: 10.4236/ojopm.2017.71001
Abstract: Polyethylene terephthalate waste (PET) was depolymerized by thiodiglycol into thioglycolyzed product. The product was characterized by FTIR and 1HNMR spectroscopy and the thermal properties (TGA, DTA) showed that the prepared compound was thermally stable until 250°C. The efficiency of the prepared corrosion inhibitor for carbon steel was measured by using acid media (0.1 HCl) as corrosive environment and the inhibitor concentration was (0, 10, 20, 30, 40 and 50 ppm). The electrochemical technique used Tafel plot to measure the efficiency of inhibitor. Factors effect on the rate of corrosion like temperature (298, 308, 318, 328 K) and concentration (10, 20, 30, 40, 50 ppm) of inhibitor were studied. From the obtained results many factors were calculated that determined the efficiency of the inhibitor like corrosion rate, charge transfer resistance and inhibitor efficiency. It was observed that the corrosion rate and charge transfer of the carbon steel for the inhibitor increase with increase of temperature and decrease with increase of the inhibitor concentration in the same temperature. The results showed that the inhibitor had high inhibition in reducing the corrosion rate. The inhibition efficiency (% IE) reached 97.1% for the 40 ppm concentration at 308 K.
Influence of Land Degradation on the Local Rate of Dust Fallout in Kuwait  [PDF]
Jasem M. Al-Awadhi, Ali M. Al-Dousari, Fikry I. Khalaf
Atmospheric and Climate Sciences (ACS) , 2014, DOI: 10.4236/acs.2014.43042
Abstract:

The rate of dust fallout was monitored during a period from August 2009 to July 2011 in protected (closed) and non-protected/open (unenclosed) areas in the northern desert of Kuwait. The dust fallout rates on degraded and protected sites were on average 18.8 and 44.1 g·m-2·month-1, respectively. Higher rate of dust fallout in protected area may be attributed to biologic factors that are responsible for relative abundance of fine-grained sediment accumulations (Mostly silty sand). Wind deflation of fine grained sediment fractions and development of coarse-grained surface lag deposits in degraded area may be accountable for the reduction of its potentiality for suspended dust. The study indicates the importance of the vegetation cover in regulating sediment availability for atmospheric dust emission.

Design and Implementation of Iris Pattern Recognition Using Wireless Network System  [PDF]
Ali Abdulhafidh Ibrahim, Thura Ali Khalaf, Bashar Mudhafar Ahmed
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.47003
Abstract: The goal of this paper is to propose a fast and accurate iris pattern recognition system by using wireless network system. This paper consists of three parts: the first part includes two methods of the iris pattern recognition system: Libor Masek and genetic algorithms, the second part includes the compression-decompression process of iris image using Principal Component Analysis (PCA) as a data reduction method, in order to reduce image size, and the third part talks about wireless network. In this work, an iris image is transferred across wireless network which contains two independent-parallel lines connected to the central Personal Computer (PC) in order to be recognized at the end of each line, then the results of recognition are sent back to the central PC. The proposed genetic algorithm, which is used in this paper is more accurate than Masek algorithm and has low computational time and complexity, which makes this method better than Masek method in recognizing iris patterns.
Dose-dependent relationship between serum metformin levels and glycemic control, insulin resistance and leptin levels in females newly diagnosed with type 2 diabetes mellitus  [PDF]
Kadhim Ali Kadhim, Dowser Khalil Ismael, Ban Hoshi Khalaf, Khalid Ibrahim Hussein, Munaf Hashim Zalzala, Saad Abdulrahman Hussain
Journal of Diabetes Mellitus (JDM) , 2012, DOI: 10.4236/jdm.2012.22028
Abstract: Despite the extensive clinical experience with the use of metformin worldwide, no formal dose-ranging study has been conducted because the current dosing strategy of metformin was determined empirically, rather than by an understanding of its dose-response relationship in patients with type 2 diabetes. The present study was designed to evaluate the correlation between serum metformin levels and glycemic control, insulin resistance and leptin levels in females newly diagnosed with type 2 diabetes. Sixty type 2 diabetic females were recruited for the study and were allocated into 3 groups; each receiving metformin 1000, 1500 and 2000 mg/day respectively for 3 months. Blood samples withdrawn from each patient at zero time and after 3 months is used to evaluate serum levels of HbA1c, glucose, leptin and insulin, in addition, the measurement of serum level of metformin in blood after 3 months by HPLC. The results demonstrated that all the treated groups with different doses of metformin showed significant improve in all parameters; the use of increased metformin doses was only correlated with plasma leptin levels in the highest dose. In conclusion, serum metformin levels are not good predictors for correlating improvement in clinical and biochemical parameters with increasing the dose in newly diagnosed non-insulin resistant females with type 2 diabetes.
Dielectric Properties and a.c. Conductivity of Epoxy/Alumina Silicate NGK Composites  [PDF]
Waleed A. Hussain, Abdullah A. Hussein, Jabar M. Khalaf, Ali H. Al-Mowali, Abdullwahab A. Sultan
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.53028
Abstract: Alumina silicate powder which is extracted from the obsolete spark plug NGK (insulator part as a filler) has been used to produce epoxy/alumina silicate composite. The dielectric behavior of the composite materials (epoxy resin-alumina silicate NGK) is analyzed as a function of the filler content, temperature and frequency. AC conductivity and impedance are also studied. The results show that the permittivity, dielectric loss and loss tangent for all composites increase with increasing alumina silicate NGK filler content.
Review of Biochemical and Nutritional Constituents in Different Green Leafy Vegetables in Oman  [PDF]
Vijaya Saradhi Settaluri, Kholood Mohammed Khalaf Al-Mamari, Salwa Ibrahim Mohammed Al-Balushi, Moza Khamis Zayid Al-Risi, Muhammad Behjat Ali
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.69079
Abstract: Green leafy vegetables are very nutrient-dense and incredibly healthy. They are vital sources of antioxidants and they are the best which are very beneficial to providing weight loss and maintenance, because it keeps you feeling full and helps control your hunger. Also, leafy vegetables are full of fiber, vitamins; minerals and substances that help protect you from disease [1] [2]. For this we choose five types of vegetables which are lettuce, cabbage, parsley, spinach and arugula to estimate some nutritional values present on them such as: carbohydrate (sucrose, fructose, glucose and starch), protein, amino acids (lysine and phenyl alanine), vitamin C (ascorbic acid) and lipid. The results obtained were analyzed and the relative percentages of these compounds were tabulated. Among the five green leafy vegetables the glucose content was highest in lettuce and was least in arugula. Among the five green leafy vegetables the fructose content was highest in parsley and was least in cabbage. Among the five green leafy vegetables the sucrose content was highest in parsley and was least in cabbage. Among the five green leafy vegetables the starch content was highest in lettuce and was least in spinach. Among the five green leafy vegetables the ascorbic acid content was highest in lettuce and was least in parsley and arugula. Among the five green leafy vegetables the protein content was highest in parsley and was least in cabbage. Among the five green leafy vegetables the lysine content was highest in cabbage and was least in arugula. Among the five green leafy vegetables the phenyl alanine content was highest in cabbage and was least in spinach. Among the five green leafy vegetables the lipid content was highest in lettuce and was least in cabbage.
Record Values from the Inverse Weibull Lifetime Model: Different Methods of Estimation  [PDF]
Khalaf S. Sultan
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.211072
Abstract: In this paper, we use the lower record values from the inverse Weibull distribution (IWD) to develop and discuss different methods of estimation in two different cases, 1) when the shape parameter is known and 2) when both of the shape and scale parameters are unknown. First, we derive the best linear unbiased estimate (BLUE) of the scale parameter of the IWD. To compare the different methods of estimation, we present the results of Sultan (2007) for calculating the best linear unbiased estimates (BLUEs) of the location and scale parameters of IWD. Second, we derive the maximum likelihood estimates (MLEs) of the location and scale parameters. Further, we discuss some properties of the MLEs of the location and scale parameters. To compare the different estimates we calculate the relative efficiency between the obtained estimates. Finally, we propose some numerical illustrations by using Monte Carlo simulations and apply the findings of the paper to some simulated data.
Programmable OTA-Based Multifunction Active Filter
Abdulrahman Khalaf Al-Ali,Muhammad Taher Abuelma'atti,Rizwan Ali Tiwana
Active and Passive Electronic Components , 1994, DOI: 10.1155/1994/10413
Abstract:
E-banking Functionality and Outcomes of Customer Satisfaction: An Empirical Investigation
Ala`Eddin Mohd Khalaf Ahmad,Hasan Ali Al-Zu’bi
International Journal of Marketing Studies , 2011, DOI: 10.5539/ijms.v3n1p50
Abstract: Purpose – The purpose of this paper is to explore the adoption of e-banking functionality and investigates the impact of e-banking on the outcomes of customer satisfaction namely, loyalty and positive WOM within the Jordanian Commercial Banks. Design/methodology/approach – A purposive sampling technique was employed to recruit 179 customers representing the desired range of demographic characteristics (e.g. gender, age, and computer use), previous internet experience levels and product-related knowledge. Findings – This research showed that adoption of e-banking (accessibility, convenience, security, privacy, content, design, speed, fees and charges) had a positive effect on Jordanian Commercial Bank customers' satisfaction, loyalty, and positive WOM. Originality/value – The paper contributes to previous research by adding to existing knowledge regarding what constitutes e-banking service. The paper makes key recommendations towards enhancing current online financial services delivery.
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