Synthesis of Stable Iron Oxide Nanoparticle Dispersions in High Ionic Medi

A novel one-pot method was developed in this work to synthesize and disperse nanoparticles in a binary base fluid. As an example, stable magnetite iron oxide (Fe3O4) dispersions, i.e., nanofluids, were produced in a high ionic media of binary lithium bromide-water using a microemulsion-mediated method. The effects of temperature and precursor concentration on morphology and size distribution of produced nanoparticles were evaluated. An effective steric repulsion force was provided by the surface functionalization of nanoparticles during the phase transfer, supported by the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The formed nanoparticles exhibited a superior stability against agglomeration in the presence of high concentrations of lithium bromide, i.e., from 20 to 50 wt.%, which make them good candidates for a range of novel applications

La theorie des systemes appliquee a l'analyse du partage des flux thermiques a l'interface de deux milieux en regime variable

SIGLECNRS T 57257 / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc

Ureteroscopy in a Resource Limited Setting: The Tikur Anbessa General Specialized Hospital Experience in Addis Ababa, Ethiopia

Background: Ureteroscopy (URS) is defined as retrograde instrumentation performed with an endoscope passed through the lower urinary tract directly into the ureter and calyceal system. However, ureteroscopy has gradually become a major diagnostic and therapeutic technique for lesions of both the ureter and intrarenal collecting system. Complications of URS range from minor complications such as colic, fever and haematuria to major complications like ureteric perforation and avulsion Methods: This was a cross sectional study of patients who underwent URS at TAGSH from 11th September 2010 to 10th September 2011. Medical records of patients were reviewed and data retrieved by a preset questionnaire. The clinical notes and imaging studies were examined. After the data was collected, it was analyzed using the statistical software SPSS version 16. Results: The main indications for ureteroscopy in our study were ureteric stones (64.3%), ureteric stricture (7.1%), ureteric obstruction of unknown cause (11.9%) and others such as pelviureteric junction (PUJ) obstruction and non-excreting kidney (16.7%). At ureteroscopy, 38 (45.3%) patients had stone disease confirmed during ureteroscopy, 20 (23.9%) were diagnosed normal and 16 (19.1%) had ureteric stricture. Most patients 56 (66.7%) had no post-operative complications. The overall complication rate of the procedure was 33.3% (n=28). Fourteen (16.7%) patients had abdominal colic, 7 (8.3%) reported haematuria, 3 (3.6%) had post-operative fever while 4 (4.8%) patients had both colic and haematuria. Only a single (1.2%) patient had ureteric perforation. Conclusion: Ureteroscopy is an indispensible diagnostic and interventional procedure. Our study shows we have a long ways to go to improve our therapeutic ureteroscopic ureteric stone lithotripsy. We can also conclude that ureteroscopy is a very safe procedure

Ureteroscopy in a Resource Limited Setting: The Tikur Anbessa General Specialized Hospital Experience in Addis Ababa, Ethiopia

Background: Ureteroscopy (URS) is defined as retrograde instrumentation performed with an endoscope passed through the lower urinary tract directly into the ureter and calyceal system. However, ureteroscopyhas gradually become a major diagnostic and therapeutic technique for lesions of both the ureter and intrarenal collecting system. Complications of URS range from minor complications such as colic, fever andhaematuria to major complications like ureteric perforation and avulsionMethods: This was a cross sectional study of patients who underwent URS at TAGSH from 11th September 2010 to 10th September 2011. Medical records of patients were reviewed and data retrieved by a presetquestionnaire. The clinical notes and imaging studies were examined. After the data was collected, it was analyzed using the statistical software SPSS version 16.Results: The main indications for ureteroscopy in our study were ureteric stones (64.3%), ureteric stricture (7.1%), ureteric obstruction of unknown cause (11.9%) and others such as pelviureteric junction (PUJ) obstruction and non-excreting kidney (16.7%). At ureteroscopy, 38 (45.3%) patients had stone disease confirmed during ureteroscopy, 20 (23.9%) were diagnosed normal and 16 (19.1%) had ureteric stricture. Most patients 56 (66.7%) had no post-operative complications. The overall complication rate of the procedure was 33.3% (n=28). Fourteen (16.7%) patients had abdominal colic, 7 (8.3%) reported haematuria, 3 (3.6%) had  post-operative fever while 4 (4.8%) patients had both colic and haematuria. Only a single (1.2%) patient had ureteric perforation.Conclusion: Ureteroscopy is an indispensible diagnostic and interventional procedure. Our study shows we have a long ways to go to improve our therapeutic ureteroscopic ureteric stone lithotripsy. We can also conclude that ureteroscopy is a very safe procedure

Ureteroscopy in a Resource Limited Setting: The Tikur Anbessa General Specialized Hospital Experience in Addis Ababa, Ethiopia

Background: Ureteroscopy (URS) is defined as retrograde instrumentation performed with an endoscope passed through the lower urinary tract directly into the ureter and calyceal system. However, ureteroscopy has gradually become a major diagnostic and therapeutic technique for lesions of both the ureter and intrarenal collecting system. Complications of URS range from minor complications such as colic, fever and haematuria to major complications like ureteric perforation and avulsion Methods: This was a cross sectional study of patients who underwent URS at TAGSH from 11th September 2010 to 10th September 2011. Medical records of patients were reviewed and data retrieved by a preset questionnaire. The clinical notes and imaging studies were examined. After the data was collected, it was analyzed using the statistical software SPSS version 16. Results: The main indications for ureteroscopy in our study were ureteric stones (64.3%), ureteric stricture (7.1%), ureteric obstruction of unknown cause (11.9%) and others such as pelviureteric junction (PUJ) obstruction and non-excreting kidney (16.7%). At ureteroscopy, 38 (45.3%) patients had stone disease confirmed during ureteroscopy, 20 (23.9%) were diagnosed normal and 16 (19.1%) had ureteric stricture. Most patients 56 (66.7%) had no post-operative complications. The overall complication rate of the procedure was 33.3% (n=28). Fourteen (16.7%) patients had abdominal colic, 7 (8.3%) reported haematuria, 3 (3.6%) had post-operative fever while 4 (4.8%) patients had both colic and haematuria. Only a single (1.2%) patient had ureteric perforation. Conclusion: Ureteroscopy is an indispensible diagnostic and interventional procedure. Our study shows we have a long ways to go to improve our therapeutic ureteroscopic ureteric stone lithotripsy. We can also conclude that ureteroscopy is a very safe procedure