International journal of Adolescence and Youth, 1998
Search. Advanced Search Within current journal Entire site. Home > List of Issues > Table o... more Search. Advanced Search Within current journal Entire site. Home > List of Issues > Table of Contents > The Satisfaction with Life Scale (SWLS): Psychometric Properties in an Arabic-speaking Sample. ...
Abstract: It can be difficult for military planners to assess potential sites when establishing f... more Abstract: It can be difficult for military planners to assess potential sites when establishing forward facilities for deployed military units in austere environments. They must consider many parameters; eg, geographic elevation and contiguous flat terrain, proximity to ...
We introduce the uncapacitated closed-loop location inventory model, which captures the interdepe... more We introduce the uncapacitated closed-loop location inventory model, which captures the interdependency between location inventory decisions in the forward and reverse supply chains. We consider a supply chain network in which a single plant ships ...
A closed-loop location-inventory problem is considered. Forward supply chain consists of a single... more A closed-loop location-inventory problem is considered. Forward supply chain consists of a single echelon where the distribution centers (DCs) have to distribute a single product to different retailers with random demands. Reverse supply chain also contains only one echelon where the remanufacturing centers (RCs) collect the returns from the retailers, remanufacture them as spare parts and then push them back to the retailers assigned to the DCs through the forward supply chain. The problem is to choose which DCs and RCs are to be opened and to associate the retailers with them. The problem is formulated using a mixed integer nonlinear location allocation model. An exact two-phase Lagrangian relaxation algorithm is developed to solve it. The computational results and sensitivity analysis are presented.
This is a retrospective study to evaluate the results of laparoscopic cholecystectomy after 2000 ... more This is a retrospective study to evaluate the results of laparoscopic cholecystectomy after 2000 cases at a single center. Between June 1992 and February 2000, 2000 patients (1458 females and 542 males, mean age 39.8 years) with symptomatic gallstones underwent laparoscopic cholecystectomy. All cases were diagnosed by abdominal ultrasonography. Preoperative endoscopic retrograde cholangiopancreatography was done for 31 patients. Four trocars were used for all except 20 cases. The mean operative time was 45 +/- 15 minutes. Conversion to open cholecystectomy occurred in 147 patients (7.35%). Adhesions were the commonest cause of conversion (2.9%). There was no technique-related mortality. Bile duct injury occurred in 7 cases (0.35%), reconstruction by Rouxen-Y hepaticojejunostomy was necessary in 5 cases and the injury was successfully managed by endoscopic stent in 2 cases. Bile leakage occurred in 11 cases (0.55%), peritonitis in 5 cases (0.25%), internal hemorrhage in 9 cases (0.45%), cystic artery injury in 17 cases (0.85%), pneumothorax in one case (0.05%) and subcutaneous emphysema in 3 cases (0.15%). Laparoscopic cholecystectomy is a good alternative to open cholecystectomy with an acceptable morbidity. Conversion to open cholecystectomy at the proper time will prevent major complications.
In many centers hepatic resection is still the treatment of choice for hepatocellular carcinoma i... more In many centers hepatic resection is still the treatment of choice for hepatocellular carcinoma in cirrhotic liver. Several factors affect the prognosis; one of them is the extent of resection. This study retrospectively evaluates outcome after different types of hepatic resection in cirrhotic liver. Hepatectomy was performed in 245 patients. From them, 140 patients were subjected to hepatic resection for hepatocellular carcinoma in cirrhotic liver. According to the type of resection the patients were divided into three groups (A, B and C), major resection (group A) in 79 (56.3%), segmental resection (group B) 31 (22.1%) and localized resection (group C) in 30 (21.4%). Early postoperative mortality and morbidity as well as long-term survival and recurrence were assessed. The overall hospital mortality rate was (8.6%) with total complications 26%, recurrence rate 32.8% and median survival was 24 months (3-120). Group A showed high incidence rate of hospital mortality, total complications and hepatic cell failure than the other two types (p>0.05). On the other hand, group C patients showed high incidence of wound infection and recurrence rate after hepatic resection than the other two types (p>0.05). At the end of the study, the median survival was 18 months (4-120), 24 months (3-48) and 24 months (3-120) for the three groups respectively without significant difference. The overall 5-year survival rate was 20%, 0% and 15.3% for the three groups respectively (p>0.05). Although major liver resection in cirrhotic liver has high incidence of early mortality and morbidity, it gives low incidence of recurrence and better survival in comparison with segmental and localized resection. However it has to be reserved for large tumor in good liver and early cirrhosis.
Nanocrystals (NC) alloyed composite CdSxSe1-x(x=0 to 1) have been prepared using the chemical sol... more Nanocrystals (NC) alloyed composite CdSxSe1-x(x=0 to 1) have been prepared using the chemical solution deposition technique. The energy band gap of these alloyed nanocrystals of approximately the same size, have been determined by scanning tunneling spectroscopy (STS) technique at room temperature. The values of the energy band gap obtained directly using STS are compared to those measured by optical spectroscopy. Increasing the molar fraction ratio x from 0 to 1 causes clearly observed increase in the band gap of the alloyed composite nanocrystal. Vegard’s law was applied to calculate the parameters of the effective mass approximation (EMA) model and the dimension obtained were compared to the values measured by STM. The good agreement of the calculated and measured values is a direct result of applying Vegard's law in the nanocomposites. Keywords—Alloy semiconductor nanocrystals, STM.
Composite nanostructures of metal core/semiconductor shell (Au/CdS) configuration were prepared u... more Composite nanostructures of metal core/semiconductor shell (Au/CdS) configuration were prepared using organometalic method. UV-Vis spectra for the Au/CdS colloids show initially two well separated bands, corresponding to surface plasmon of the Au core, and the exciton of CdS shell. The absorption of CdS shell is enhanced, while the Au plasmon band is suppressed as the shell thickness increases. The shell sizes were estimated from the optical spectra using the effective mass approximation model (EMA), and compared to the sizes of the Au core and CdS shell measured by high resolution transmission electron microscope (HRTEM). The changes in the absorption features are discussed in terms of gradual increase in the coupling strength of the Au core surface plasmon and the exciton in the CdS. leading to charge transfer and modification of electron oscillation in Au core.
Photoacoustic (PA) spectra were obtained for CdSe nanorods (NRs) of different aspect ratios, prep... more Photoacoustic (PA) spectra were obtained for CdSe nanorods (NRs) of different aspect ratios, prepared via the organometallic synthesis. The second derivative spectra were used to have an accurate determination of the different excitonic transitions. Using the lowest ...
The energy band gap of a series of different sizes of CdSe quantum rods have been determined by S... more The energy band gap of a series of different sizes of CdSe quantum rods have been determined by STM technique at room temperature. The results confirm that the band gap of CdSe quantum rods (QRs) depends mainly on the width (the dimension of the electron confinement) and only slightly on the length as shown previously in the literatures. The experimental
Photoacoustic (PA) technique has been used to study the optical and thermal properties of core/sh... more Photoacoustic (PA) technique has been used to study the optical and thermal properties of core/shell (Ag/CdSe) nanostructure. Core shell Ag/CdSe nanostructure particles were prepared using organometalic method, having a core of (12-14 nm) and CdSe shell ...
International journal of Adolescence and Youth, 1998
Search. Advanced Search Within current journal Entire site. Home > List of Issues > Table o... more Search. Advanced Search Within current journal Entire site. Home > List of Issues > Table of Contents > The Satisfaction with Life Scale (SWLS): Psychometric Properties in an Arabic-speaking Sample. ...
Abstract: It can be difficult for military planners to assess potential sites when establishing f... more Abstract: It can be difficult for military planners to assess potential sites when establishing forward facilities for deployed military units in austere environments. They must consider many parameters; eg, geographic elevation and contiguous flat terrain, proximity to ...
We introduce the uncapacitated closed-loop location inventory model, which captures the interdepe... more We introduce the uncapacitated closed-loop location inventory model, which captures the interdependency between location inventory decisions in the forward and reverse supply chains. We consider a supply chain network in which a single plant ships ...
A closed-loop location-inventory problem is considered. Forward supply chain consists of a single... more A closed-loop location-inventory problem is considered. Forward supply chain consists of a single echelon where the distribution centers (DCs) have to distribute a single product to different retailers with random demands. Reverse supply chain also contains only one echelon where the remanufacturing centers (RCs) collect the returns from the retailers, remanufacture them as spare parts and then push them back to the retailers assigned to the DCs through the forward supply chain. The problem is to choose which DCs and RCs are to be opened and to associate the retailers with them. The problem is formulated using a mixed integer nonlinear location allocation model. An exact two-phase Lagrangian relaxation algorithm is developed to solve it. The computational results and sensitivity analysis are presented.
This is a retrospective study to evaluate the results of laparoscopic cholecystectomy after 2000 ... more This is a retrospective study to evaluate the results of laparoscopic cholecystectomy after 2000 cases at a single center. Between June 1992 and February 2000, 2000 patients (1458 females and 542 males, mean age 39.8 years) with symptomatic gallstones underwent laparoscopic cholecystectomy. All cases were diagnosed by abdominal ultrasonography. Preoperative endoscopic retrograde cholangiopancreatography was done for 31 patients. Four trocars were used for all except 20 cases. The mean operative time was 45 +/- 15 minutes. Conversion to open cholecystectomy occurred in 147 patients (7.35%). Adhesions were the commonest cause of conversion (2.9%). There was no technique-related mortality. Bile duct injury occurred in 7 cases (0.35%), reconstruction by Rouxen-Y hepaticojejunostomy was necessary in 5 cases and the injury was successfully managed by endoscopic stent in 2 cases. Bile leakage occurred in 11 cases (0.55%), peritonitis in 5 cases (0.25%), internal hemorrhage in 9 cases (0.45%), cystic artery injury in 17 cases (0.85%), pneumothorax in one case (0.05%) and subcutaneous emphysema in 3 cases (0.15%). Laparoscopic cholecystectomy is a good alternative to open cholecystectomy with an acceptable morbidity. Conversion to open cholecystectomy at the proper time will prevent major complications.
In many centers hepatic resection is still the treatment of choice for hepatocellular carcinoma i... more In many centers hepatic resection is still the treatment of choice for hepatocellular carcinoma in cirrhotic liver. Several factors affect the prognosis; one of them is the extent of resection. This study retrospectively evaluates outcome after different types of hepatic resection in cirrhotic liver. Hepatectomy was performed in 245 patients. From them, 140 patients were subjected to hepatic resection for hepatocellular carcinoma in cirrhotic liver. According to the type of resection the patients were divided into three groups (A, B and C), major resection (group A) in 79 (56.3%), segmental resection (group B) 31 (22.1%) and localized resection (group C) in 30 (21.4%). Early postoperative mortality and morbidity as well as long-term survival and recurrence were assessed. The overall hospital mortality rate was (8.6%) with total complications 26%, recurrence rate 32.8% and median survival was 24 months (3-120). Group A showed high incidence rate of hospital mortality, total complications and hepatic cell failure than the other two types (p>0.05). On the other hand, group C patients showed high incidence of wound infection and recurrence rate after hepatic resection than the other two types (p>0.05). At the end of the study, the median survival was 18 months (4-120), 24 months (3-48) and 24 months (3-120) for the three groups respectively without significant difference. The overall 5-year survival rate was 20%, 0% and 15.3% for the three groups respectively (p>0.05). Although major liver resection in cirrhotic liver has high incidence of early mortality and morbidity, it gives low incidence of recurrence and better survival in comparison with segmental and localized resection. However it has to be reserved for large tumor in good liver and early cirrhosis.
Nanocrystals (NC) alloyed composite CdSxSe1-x(x=0 to 1) have been prepared using the chemical sol... more Nanocrystals (NC) alloyed composite CdSxSe1-x(x=0 to 1) have been prepared using the chemical solution deposition technique. The energy band gap of these alloyed nanocrystals of approximately the same size, have been determined by scanning tunneling spectroscopy (STS) technique at room temperature. The values of the energy band gap obtained directly using STS are compared to those measured by optical spectroscopy. Increasing the molar fraction ratio x from 0 to 1 causes clearly observed increase in the band gap of the alloyed composite nanocrystal. Vegard’s law was applied to calculate the parameters of the effective mass approximation (EMA) model and the dimension obtained were compared to the values measured by STM. The good agreement of the calculated and measured values is a direct result of applying Vegard's law in the nanocomposites. Keywords—Alloy semiconductor nanocrystals, STM.
Composite nanostructures of metal core/semiconductor shell (Au/CdS) configuration were prepared u... more Composite nanostructures of metal core/semiconductor shell (Au/CdS) configuration were prepared using organometalic method. UV-Vis spectra for the Au/CdS colloids show initially two well separated bands, corresponding to surface plasmon of the Au core, and the exciton of CdS shell. The absorption of CdS shell is enhanced, while the Au plasmon band is suppressed as the shell thickness increases. The shell sizes were estimated from the optical spectra using the effective mass approximation model (EMA), and compared to the sizes of the Au core and CdS shell measured by high resolution transmission electron microscope (HRTEM). The changes in the absorption features are discussed in terms of gradual increase in the coupling strength of the Au core surface plasmon and the exciton in the CdS. leading to charge transfer and modification of electron oscillation in Au core.
Photoacoustic (PA) spectra were obtained for CdSe nanorods (NRs) of different aspect ratios, prep... more Photoacoustic (PA) spectra were obtained for CdSe nanorods (NRs) of different aspect ratios, prepared via the organometallic synthesis. The second derivative spectra were used to have an accurate determination of the different excitonic transitions. Using the lowest ...
The energy band gap of a series of different sizes of CdSe quantum rods have been determined by S... more The energy band gap of a series of different sizes of CdSe quantum rods have been determined by STM technique at room temperature. The results confirm that the band gap of CdSe quantum rods (QRs) depends mainly on the width (the dimension of the electron confinement) and only slightly on the length as shown previously in the literatures. The experimental
Photoacoustic (PA) technique has been used to study the optical and thermal properties of core/sh... more Photoacoustic (PA) technique has been used to study the optical and thermal properties of core/shell (Ag/CdSe) nanostructure. Core shell Ag/CdSe nanostructure particles were prepared using organometalic method, having a core of (12-14 nm) and CdSe shell ...
Uploads
Papers by tala abdallah