International Journal of Non-Linear Mechanics, 2005
A mathematical formulation for the contact of rough surfaces is presented. The derivation of the ... more A mathematical formulation for the contact of rough surfaces is presented. The derivation of the contact model is facilitated through the definition of plastic asperities that are assumed to be embedded at a critical depth within the actual surface asperities. The surface asperities ...
Diffusion and Defect Data Solid State Data Part B Solid State Phenomena, 2009
Page 1. The Effect of Controlled Frequency and Amplitude of Vibration on Friction Jamil Abdo 1, a... more Page 1. The Effect of Controlled Frequency and Amplitude of Vibration on Friction Jamil Abdo 1, a , Amer Al-Yhmadi 1, b 1Mechanical Engineering Dept., Sultan Qaboos University, PO Box 33, AlKhod 123, Oman ajdabdo@squ.edu.om, bamery@squ.edu.om ...
Journal of Environmental Science and Health Part a Toxic Hazardous Substances Environmental Engineering, Feb 1, 2007
Data on the concentrations of non-methane hydrocarbons (NMHC), nitrogen oxide (NO), nitrogen diox... more Data on the concentrations of non-methane hydrocarbons (NMHC), nitrogen oxide (NO), nitrogen dioxide (NO2), carbon monoxide (CO), and meteorological parameters (air temperature and solar radiation) were used to predict the concentration of tropospheric ozone using the Design-Ease software. These data were collected on hourly basis over a 12-month period. Sampling of the data was conducted automatically. The effect of the NMHC, NO, NO2,CO, temperature and solar radiation variables in predicting ozone concentrations was examined under two scenarios: (i) when NO is included with the absence of NO2; and (ii) when NO2 is addressed with the absence of NO. The results of these two scenarios were validated against ozone actual data. The predicted concentration of ozone in the second scenario (i.e., when NO2 is addressed) was in better agreement with the real observations. In addition, the paper indicated that statistical models of hourly surface ozone concentrations require interactions and non-linear relationships between predictor variables in order to accurately capture the ozone behavior.
Page 1. 1 15th ASCE Engineering Mechanics Conference June 2-5, 2002, Columbia University, New Yor... more Page 1. 1 15th ASCE Engineering Mechanics Conference June 2-5, 2002, Columbia University, New York, NY Theoretical Modeling and Experimental Technique to Study of Contact Load Ratio Friction Function Jamil A. Abdo 1 and Kambiz Farhang 2 ...
Annals of hepatology: official journal of the Mexican Association of Hepatology
Background & aim: Despite treatment with glucocorticoids, mortality remains high in patients with... more Background & aim: Despite treatment with glucocorticoids, mortality remains high in patients with severe alcoholic hepatitis. Oxidative stress and depletion of mitochondrial glutathione are implicated factors in liver injury. The aim of this study was to evaluate the impact of the addition of metadoxine, a drug which possesses a multifactorial mechanism of action, including antioxidant properties, to standard treatment with glucocorticoids in patients with severe alcoholic hepatitis. Material and methods: This randomized open label clinical trial was performed in Mexico's General Hospital (Registry Key DIC/10/107/03/043). We randomized 70 patients with severe alcoholic hepatitis. The first group received prednisone (40 mg/day), and the second group received prednisone (40 mg/day) plus metadoxine tablets (500 mg three times daily). The duration of treatment in both groups was 30 days. Survival at 30 and 90 days, development of complications, adverse events and response to treatme...
Attapulgite (ATT) is purified, synthesized, characterized, functionalized, and tested in nano-for... more Attapulgite (ATT) is purified, synthesized, characterized, functionalized, and tested in nano-form (10–25 nm diameter) for its effectiveness to tailor the rheology of drilling fluids swiftly to reduce friction, discourage use of other expensive additives, and improve functionality. A schematic procedure for purification and synthesis of ATT to nano-level for uniform dispersion is established. X-ray diffraction and scanning electron microscopy (SEM) are utilized to analyze the nano-attapulgite (NATT) structure. The effects of NATT-modified drilling fluids on the tribological properties mainly the coefficient of friction (COF) between the drillstring and the wellbore are established. OFITE Lubricity Tester is used to measure the COF values of the test samples. To test for the performance of the NATT-modified drilling fluids, an in-house experimental setup that imitates the wellbore being drilled in the presence of surrounding drilling fluid was developed and utilized to investigate th...
International Journal of Non-Linear Mechanics, 2005
A mathematical formulation for the contact of rough surfaces is presented. The derivation of the ... more A mathematical formulation for the contact of rough surfaces is presented. The derivation of the contact model is facilitated through the definition of plastic asperities that are assumed to be embedded at a critical depth within the actual surface asperities. The surface asperities ...
Diffusion and Defect Data Solid State Data Part B Solid State Phenomena, 2009
Page 1. The Effect of Controlled Frequency and Amplitude of Vibration on Friction Jamil Abdo 1, a... more Page 1. The Effect of Controlled Frequency and Amplitude of Vibration on Friction Jamil Abdo 1, a , Amer Al-Yhmadi 1, b 1Mechanical Engineering Dept., Sultan Qaboos University, PO Box 33, AlKhod 123, Oman ajdabdo@squ.edu.om, bamery@squ.edu.om ...
Journal of Environmental Science and Health Part a Toxic Hazardous Substances Environmental Engineering, Feb 1, 2007
Data on the concentrations of non-methane hydrocarbons (NMHC), nitrogen oxide (NO), nitrogen diox... more Data on the concentrations of non-methane hydrocarbons (NMHC), nitrogen oxide (NO), nitrogen dioxide (NO2), carbon monoxide (CO), and meteorological parameters (air temperature and solar radiation) were used to predict the concentration of tropospheric ozone using the Design-Ease software. These data were collected on hourly basis over a 12-month period. Sampling of the data was conducted automatically. The effect of the NMHC, NO, NO2,CO, temperature and solar radiation variables in predicting ozone concentrations was examined under two scenarios: (i) when NO is included with the absence of NO2; and (ii) when NO2 is addressed with the absence of NO. The results of these two scenarios were validated against ozone actual data. The predicted concentration of ozone in the second scenario (i.e., when NO2 is addressed) was in better agreement with the real observations. In addition, the paper indicated that statistical models of hourly surface ozone concentrations require interactions and non-linear relationships between predictor variables in order to accurately capture the ozone behavior.
Page 1. 1 15th ASCE Engineering Mechanics Conference June 2-5, 2002, Columbia University, New Yor... more Page 1. 1 15th ASCE Engineering Mechanics Conference June 2-5, 2002, Columbia University, New York, NY Theoretical Modeling and Experimental Technique to Study of Contact Load Ratio Friction Function Jamil A. Abdo 1 and Kambiz Farhang 2 ...
Annals of hepatology: official journal of the Mexican Association of Hepatology
Background & aim: Despite treatment with glucocorticoids, mortality remains high in patients with... more Background & aim: Despite treatment with glucocorticoids, mortality remains high in patients with severe alcoholic hepatitis. Oxidative stress and depletion of mitochondrial glutathione are implicated factors in liver injury. The aim of this study was to evaluate the impact of the addition of metadoxine, a drug which possesses a multifactorial mechanism of action, including antioxidant properties, to standard treatment with glucocorticoids in patients with severe alcoholic hepatitis. Material and methods: This randomized open label clinical trial was performed in Mexico's General Hospital (Registry Key DIC/10/107/03/043). We randomized 70 patients with severe alcoholic hepatitis. The first group received prednisone (40 mg/day), and the second group received prednisone (40 mg/day) plus metadoxine tablets (500 mg three times daily). The duration of treatment in both groups was 30 days. Survival at 30 and 90 days, development of complications, adverse events and response to treatme...
Attapulgite (ATT) is purified, synthesized, characterized, functionalized, and tested in nano-for... more Attapulgite (ATT) is purified, synthesized, characterized, functionalized, and tested in nano-form (10–25 nm diameter) for its effectiveness to tailor the rheology of drilling fluids swiftly to reduce friction, discourage use of other expensive additives, and improve functionality. A schematic procedure for purification and synthesis of ATT to nano-level for uniform dispersion is established. X-ray diffraction and scanning electron microscopy (SEM) are utilized to analyze the nano-attapulgite (NATT) structure. The effects of NATT-modified drilling fluids on the tribological properties mainly the coefficient of friction (COF) between the drillstring and the wellbore are established. OFITE Lubricity Tester is used to measure the COF values of the test samples. To test for the performance of the NATT-modified drilling fluids, an in-house experimental setup that imitates the wellbore being drilled in the presence of surrounding drilling fluid was developed and utilized to investigate th...
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