5 results on '"Son S"'
Search Results
2. Observations on the Mechanism of Reaction Propagation in Metastable Intermolecular Composites.
- Author
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Asay, B. W., Son, S. F., Busse, J. R., and Oschwald, D. M.
- Subjects
- *
COMPOSITE materials , *OXIDIZING agents , *FUEL , *PARTICLE size determination , *NANOSTRUCTURED materials , *HIGH-speed photography , *ALUMINUM - Abstract
Metastable Intermolecular Composite (MIC) materials are comprised of a mixture of oxidizer and fuel with particle sizes in the nanometer range. They are a subclass of materials known as thermites. The mechanism responsible for the propagation of reaction in loose compacts is not well understood. We have conducted a series of experiments using high-speed photography and pressure transducers in an attempt to identify the dominant mechanism. We studied a mixture of aluminum and molybdenum trioxide. Of the four possible candidates (radiation, convection, conduction, and acoustic/compaction), these preliminary studies identify convection as the most likely. However, the extent of contribution of the other modes is not yet known and this will receive further study. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]
- Published
- 2004
- Full Text
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3. [Prevalence of hepatitis A, B, C and E virus markers among patients with elevated levels of Alanine aminotransferase and Aspartate aminotransferase in Phnom Penh (Cambodia) and Nha Trang (Central Vietnam)].
- Author
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Buchy P, Monchy D, An TT, Srey CT, Tri DV, Son S, Glaziou P, and Chien BT
- Subjects
- Adolescent, Adult, Biomarkers blood, Cambodia epidemiology, Child, Female, Hepatitis, Viral, Human blood, Hepatitis, Viral, Human epidemiology, Humans, Male, Middle Aged, Prevalence, Vietnam epidemiology, Alanine Transaminase blood, Aspartate Aminotransferases blood, Hepatitis A virus immunology, Hepatitis B Surface Antigens blood, Hepatitis C Antibodies blood, Hepatitis E immunology, Immunoglobulin G blood, Immunoglobulin M blood
- Abstract
In order to describe the respective part of viral hepatitis in liver diseases observed in Cambodia and Vietnam, ninety consecutive patients with Aspartate aminotransferase (AST) and Alanine aminotransferase (ALT) > or = 100 Ul/l were tested for hepatitis A, B, C and E markers in Phnom Penh and Nha Trang. The markers were IgM antibodies to hepatitis A virus (anti-HAV IgM), hepatitis B surface antigen (HBsAg), antibodies to hepatitis C virus (anti-HCVAb) and IgG antibodies to hepatitis E virus (anti-HEV IgG). Recruited patients were predominantly adults and male (sex ratio 76%). Among these patients, 81% were tested positive to at least one marker in Nha Trang and 79% in Phnom Penh. In Nha Trang, HBsAg was more frequent (73%) than anti-HCV Ab (9%) while in Phnom Penh both markers were closely similar (HBsAg: 41%, anti-HCV Ab: 39%). In both population samples, HBsAg was more prevalent among young people whereas anti-HCV Ab were only detected in adults. No case of acute HAV infection was diagnosed in Nha Trang while anti-HAV IgM were detected in 20% of Cambodian patients. Anti-HEV IgG were infrequent (2% in Nha Trang, 5.5% in Phnom Penh). Only one case was notified, a male Vietnamese patient probably suffering from acute hepatitis E. More studies would be useful to improve the control measures against viral hepatitis in the public health programs.
- Published
- 2004
4. [Mini-invasive surgery of the retroperitoneal space in children].
- Author
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Valla JS, Colomb F, Son S, Michelini E, Steyaert H, and Guilloneau B
- Subjects
- Adolescent, Adrenalectomy adverse effects, Adrenalectomy instrumentation, Child, Child, Preschool, Cystectomy adverse effects, Cystectomy instrumentation, Humans, Infant, Length of Stay statistics & numerical data, Minimally Invasive Surgical Procedures adverse effects, Minimally Invasive Surgical Procedures instrumentation, Nephrectomy adverse effects, Nephrectomy instrumentation, Patient Selection, Retrospective Studies, Treatment Outcome, Adrenalectomy methods, Cystectomy methods, Minimally Invasive Surgical Procedures methods, Nephrectomy methods, Retroperitoneal Space surgery
- Abstract
Unlabelled: Although laparoscopic surgery now represents today an essential surgical technique, its use remains limited in urology and especially in pediatric urology for many reasons, main because of the lack of indications. After a large experience acquired in abdominal laparoscopic surgery, and because we were convinced of the advantages offered by this new mini-invasive approach, we have tried to develop it for the retroperitoneal space., Methods: Over a five-year period we performed 88 retroperitoneal procedures in children:--50 nephrectomies (44 total, 10 partial) for the following indications: 15 polycystic dysplastic kidney, 13 kidney destroyed by reflux, 18 by obstruction, hypertensive uropathy 3, pyonephrosis 1.--5 renal cystectomies, 3 pyelolithotomies, 2 pyeloureteral obstructions, 2 adrenalectomies, 1 retrocaval ureter, 25 varicoceles. The age range was 2 months to 16 years (mean: 3.7 years, 25 children under 1 year). The patients were placed in the lateral debubitus. The retroperitoneal space was created by dissection under direct vision, then insufflation was performed directly in the retroperitoneal space without balloon. Three or four ports were used except for varicocelectomy which was performed with only one port and an operating channel telescope., Results: Follow-up range was 6 months to 5 years. The mean operating time was 96 minutes (35 to 210 min.). Average postoperative stay was 2 days. Conversion was needed in 7 cases (8%). Operative incidents consisted of one duodenal perforation, one ureteral burn, 21 peritoneal perforations (24%). There were 5 postoperative complications (2 urinomas after partial nephrectomy, 1 hydrocele, 1 varicocele recurrence, 1 recurrent stones) not related to the technique. 3 cases needed reoperation (ureteral injury, varicocele recurrence, recurrence of cystine stones) with good result., Conclusion: Like other laparoscopic techniques, retroperitoneoscopy requires a training: it remains delicate in children because of the reduced working space and the fragility of the peritoneum. However the advantages seem sufficiently obvious for us to recommend and promote this procedure.
- Published
- 1999
5. [Benign testicular tumors in children. Value of simple tumorectomy].
- Author
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Valla JS, Steyaert H, Leculée R, Colomb F, Breau J, Son S, and Hoffman P
- Subjects
- Adolescent, Algorithms, Biopsy, Child, Child, Preschool, Decision Trees, Follow-Up Studies, Humans, Male, Orchiectomy methods, Patient Selection, Testicular Neoplasms diagnosis, Treatment Outcome, Testicular Neoplasms surgery
- Abstract
From 1984 to 1999, the authors observed 18 intratesticular tumours, 13 of which corresponded to benign lesions. The objective of this study is to define preoperative and intraoperative criteria of benign lesions in order to allow conservative management (simple excision or enucleation) and to analyse the results of this treatment. The 13 boys of this series were between the ages of 5 months and 14 years (mean: 7.1 years). The lesion presented as scrotal swelling in 12 cases and gynaecomastia in 1 case. Tumour markers (alphafoetoprotein, beta HCG) were at the limit of normal for age. Ultrasonography was performed in every case. In each case, treatment consisted of primary exposure of the pediclc with clamping then exteriorization and macroscopic examination of the lesion. Frozen section examination was performed in 11 cases. Treatment consisted of 9 enucleations and 4 orchidectomies. The final histology concluded on epidermoid cyst or simplified teratoma with exclusively ectodermal development in 4 cases, multi-differentiated teratoma in 2 cases, sex cord tumour in 2 cases, simple cyst in 2 cases, rete testis dysplasia in 1 case, cavernous haemangioma in 1 case, and vestigial cyst in 1 case. There was no discordance between the final histological examination and the frozen section examination. The mean follow-up is 4.4 years. No secondary atrophy and no local or distant recurrence was observed in the 9 cases of enucleation. In conclusion, testicular tumours are often benign in children. Selection based on a body of clinical, laboratory, radiological and frozen section histological evidence should allow carcinologically safe conservative surgery with an aesthetic, psychological and functional benefit for the child.
- Published
- 1999
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