Al Tahadi University

Sirte, Libya

Al Tahadi University

Sirte, Libya
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Tashani O.A.,Leeds Beckett University | Tashani O.A.,Leeds Pallium Research Group | Tashani O.A.,University of Benghazi | Alabas O.A.M.,Leeds Beckett University | And 4 more authors.
Gender Medicine | Year: 2010

Background: Studies have suggested that sex/gender, ethnicity, and anxiety toward pain affect pain sensitivity response. However, most studies have been conducted in a developed (Western) country, where the "ethnic" comparison group was in the minority. Objectives: This study measured the responses of Libyan men and women to cold pressor pain, and also examined the effect of anxiety about pain and of body characteristics such as height, weight, and body mass index (BMI) on pain responses. Methods: Students attending Garyounis University, Benghazi, Libya, took part in an experiment in 2007 that consisted of 2 cold pressor pain tests. During each test, participants plunged their nondominant hand into a slurry of ice. Time to pain threshold, time to pain tolerance (removal of the hand from the ice), and pain intensity and unpleasantness were measured using a 100-mm visual analog scale. Participants also completed a 20-item Pain Anxiety Symptoms Scale (PASS-20) questionnaire, with each item scored on a 6-point Likert scale anchored by descriptive phrases (0 = never, 5 = always). Results: Fifty-eight self-declared students (29 men, 29 women; age range, 1938 years) participated in the study. Pain threshold was significantly higher for men (mean difference, 8.2 sec; 95% CI, -1.7 to 18.0; P = 0.04), but there were no significant differences in pain tolerance, intensity, or unpleasantness. Women had significantly higher scores on the PASS-20 total score (P = 0.03), and on the PASS-20 dimensions of escape/avoidance (P = 0.04) and physiological anxiety (P = 0.006). Height, but not weight or BMI, was correlated with pain threshold in women (r = 0.52; P = 0.019) but not in men. Significant predictors of linearity of pain tolerance in women, but not men, were height (r = 0.49; P = 0.028) and the cognitive anxiety dimension score of the PASS-20 (r = -0.69; P = 0.004). Pain intensity rating was significantly higher in both women and men in the presence of an investigator of the opposite sex. Conclusions: Libyan women had higher pain sensitivity response to cold pressor pain than did Libyan men, but both sexes had lower pain responses than their Western counterparts. Height and anxiety may have contributed to the differences between the sexes in this study. © 2010 Excerpta Medica Inc.

Al-Janabi A.I.M.,Al Tahadi University | Orabi A.A.R.,Al Tahadi University | Baqir A.Y.A.,University of Nebraska - Lincoln
Numerical Methods in Geotechnical Engineering - Proceedings of the 7th European Conference on Numerical Methods in Geotechnical Engineering | Year: 2010

In the present study, the upper bound limit analysis theorem of plasticity is applied to plane strain bearing capacity problems for soils under external load with or without self-weight loads. In deriving the upper bound formulation, a continuous velocity field is assumed and the soil is idealized as a rigid-perfectly plastic material obeying the nonlinear Mohr-Coulomb yield criterion with the associated flow rule. As a powerful solution technique, the finite element method is used to discretize the problem domain and a suitable optimization algorithm is used to solve the resulting constrained nonlinear optimization problem to obtain the limit load and the corresponding collapse mechanisms. Numerical solutions for selected case studies showed that the proposed method of analysis which combines the upper bound limit analysis with the finite element method can be efficiently used for predicting the limit load for various bearing capacity problems. © 2010 Taylor & Francis Group, London.

Nasr A.M.A.,Tanta University | Nasr A.M.A.,Al Tahadi University
Journal of Geotechnical and Geoenvironmental Engineering | Year: 2010

This paper presents the results of a series of plain-strain model tests carried out on both clean sand and oil-contaminated sand loaded with a rigid strip footing. The objectives of this study are to determine the influence of oil-contaminated sand on the bearing capacity characteristics and the settlement of the footing. Contaminated sand layers were prepared by mixing the sand with an oil content of 0-5% with respect to dry soil to match the field conditions. The investigations are carried out by varying the depth and the length of the contaminated sand layer and the type of oil contamination. A plain-strain elastoplastic theoretical model with an interface gap element between footing and the soil is carried out to verify the test results of the model. It is shown that the load-settlement behavior and ultimate bearing capacity of the footing can be drastically reduced by oil contamination. The bearing capacity is decreased and the settlement of the footing is increased with increasing the depth and the length of the contaminated sand layer. The agreement between observed and computed results is found to be reasonably good in terms of load-settlement behavior and effect of oil contamination on the bearing capacity ratio. A comparison between the model results and the prototype scale (B=1.0 m) results are also studied. © 2009 ASCE.

Madhavi J.,Acharya Nagarjuna University | Srilakshmi J.,Acharya Nagarjuna University | Raghavendra Rao M.V.,Al Tahadi University | Sambasiva Rao K.R.S.,Acharya Nagarjuna University
International Journal of Bio-Science and Bio-Technology | Year: 2011

Leather processing involves many sequential steps form raw hide to the processed leather. All these steps define the quality of leather in order to perform in the prescribed conditions. Dehairing of raw hide is one of the most important steps which define removal of hair, fat and other unnecessary things form raw hide. The most convenient way to achieve perfect dehairing is use of enzyme and specifically protease which dissolve the hair protein without affecting structure of skin. In this process generally alkaline and neutral proteases have been used extensively since last two decades. Though the conventional protease are efficient for dehairing of raw hide but the stability of these protease in various temperatures and chemical environments hamper their activity. In many instances the process will run for long duration which again reduces the activity of enzymes. Thermostable proteases form microbial sources are the better option to render the problem of stability of conventional protease in the different temperatures and chemical environments. Many of bacterial strains naturally adapted their habitat in higher temperature and the enzymes of such bacterial strains are very stable. Many of thermostable proteases have been isolated, purified and implemented in various industrial processes which have been limited due to stability complication of conventional protease. Here in this article we have summarized the potential role of thermostable proteases in leather industry and more specifically in dehairing of raw hide.

Hander G.M.H.B.,Al Tahadi University
Research Journal of Chemistry and Environment | Year: 2011

A simple and sensitive spectrophotometric method is reported for the determination of manganese(II) based on its catalytic effect on the oxidation of nitrilotriacetatocobalt(II)-benzoate complex by periodate in acetate medium. The increase in absorbance of Co(III)-product was monitored at 580 nm, pH = 4.99, I = 0.5 M and T = 25 °C. The kinetics studied have been investigated under pseudo first order condition by taking large excess of oxidant. The various variables affect on sensitivity were studied and optimized and a study of interfering ions was also carried out. The calibration graph was linear in the range of 0.050-0.50 mol dm -3 acetate and (3.0 - 15.0) × 10 -5 mol dm -3 Mn(II). Mn(I1) in tap water, ground water and an industrial waste water has been successfully determined by the proposed method.

Ewais H.A.,King Abdulaziz University | Habib M.A.,Al Tahadi University | Elroby S.A.K.,King Abdulaziz University
Transition Metal Chemistry | Year: 2010

The oxidation of [CrIII(HNTA)(Hist)(H2O)]- and [CrIII(HNTA)(Asp)(H2O)]- (NTA = nitrilotriacetate, Hist = l-histidinate and Asp = dl-aspartate) by periodate in aqueous medium has been studied spectrophotometrically between 15.0 and 35.0 °C under pseudo-first-order conditions, [IO4 -] ≫ [complex]. The rate increases over the pH range 3.40-4.45 in both cases, but the two complexes give different rate laws. It is proposed that electron transfer proceeds through an inner-sphere mechanism via coordination of IO4 - to chromium(III). A common mechanism for the oxidation of some chromium(III) complexes by periodate is proposed, and this is supported by an excellent isokinetic relationship between ΔH*and ΔS*values for these reactions. © 2009 Springer Science+Business Media B.V.

Ewais H.A.,King Abdulaziz University | Hassun S.M.,Al Tahadi University
Oxidation Communications | Year: 2012

The oxidation of [Co II(nta)(M)(H 2O) 2] 3- by periodate has been studied kinetically in aqueous solution over 20.0∼40.0°C and a variety of pH ranges. The rate of oxidation of [Co II(nta)(M)(H 2O) 2] 3-by periodate, obeys the following equation: d[Co III] T/dt = (k 2K 3 + k 1 K 2 K 1/[H +]) [IO 4 -][Co II] 1(l + (K 1/[H +]) + (K 3 + K 1K 2[H +])[IO 4 -]) Initial cobalt(III) products were formed and slowly converted to final products, fitting an inner-sphere mechanism. Thermodynamic activation parameters have been calculated. A common mechanism for the oxidation of a ternary nitrilotriacetatocobalt(II) complexes by periodate is proposed and supported by an excellent isokinetic relationship between ΔH * and ΔS * values for these reactions.

Ewais H.A.,King Abdulaziz University | Taha M.,National Taiwan University of Science and Technology | Salm H.N.,Al Tahadi University
Journal of Chemical and Engineering Data | Year: 2010

Ternary 1:1:1 complexes of Pd(II) with dipicolinic acid (DPA) or iminodiacetic acid (IDA) as primary ligands and some selected mono-and dicarboxylic amino acids (glycine, α-alanine, leucine, valine, phenylalanine, tryptophan, methionine, histadiene aspartic acid, and glutamic acid), aromatic carboxylic acids (salicylic and phthalic), and aliphatic carboxylic acids (succinic, oxalic, malic, maleic, malonic, and tartaric) as secondary ligands have been investigated by using the potentiometric technique at T = 30 °C and I = 0.1 mol·dm-3. The ternary complexes are formed in a stepwise mechanism. Confirmation of the ternary complexes in solution has been carried out using conductometric measurements. © 2010 American Chemical Society.

Rao S.V.K.,Osmania University | Nasr A.M.,Al Tahadi University
International Journal of Geotechnical Engineering | Year: 2010

The behavior of vertical single piles embedded in reinforced and non-reinforced cohesionless soil has been investigated with the help of small-scale model tests. These piles were installed in sand of different relative densities (Dr = 30 and 60%) and subjected to pullout loads of different inclinations. The model pile pullout tests were conducted using three reinforced concrete circular piles with different surface conditions (smooth, smooth with necking and bulging, and rough). The influence of sand reinforcement with geogrid on the uplift performance of the model piles was investigated. These investigations were carried out by varying the inclination of the pullout load, the embedded depth of reinforcement, the number of reinforcement layers, and the length of the reinforcement layer. The test results show that the pullout resistance increases with the concrete surface roughness, sand density and the inclusion of a reinforcing layer. It was also found that the effectiveness of the reinforced layer is dependent on the concrete surface roughness. This paper also discusses the effects of these parameters on the relative ground movement near the pile surface. J. Ross Publishing, Inc. © 2010

Radwan A.,Al Tahadi University
International Conference on Communications - Proceedings | Year: 2010

The aim of my work is to design the structure of the network, which enables quite large data transmission between one central unit and many movable slave stations (point to multipoint network) and to work out the part of this solution in detail - the communication protocol for the data link layer.

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