Journal articles: 'Angle of Treitz'

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Ammari Smail and Taieb M. "Adenocarcinoma of the duodenojejunal angle (The Angle of Treitz): Diagnostic and therapeutic difficulties: About 02 cases." World Journal of Advanced Research and Reviews 21, no. 1 (2024): 2851–56. http://dx.doi.org/10.30574/wjarr.2024.21.1.0348.

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The adenocarcinoma of the Treitz angle is extremely rare. Its symptoms are not specific, hence its often late diagnosis. In addition, this anatomical location is difficult to access to standard endoscopy, so it is very difficult to obtain a biopsy. The surgical procedure for adenocarcinoma of the angle of Treitz remains controversial. It’s hard to get a carcinological resection of this cancer. We report two new cases of adenocarcinoma from the Treitz angle with a literature review. Our objective is to discuss the clinical manifestations and circumstances of diagnosis, as well as the therapeutic modalities for adenocarcinomas of this location.

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Ammari, Smail, and M. Taieb. "Adenocarcinoma of the duodenojejunal angle (The Angle of Treitz): Diagnostic and therapeutic difficulties: About 02 cases." World Journal of Advanced Research and Reviews 21, no. 1 (2024): 2851–56. https://doi.org/10.5281/zenodo.13382170.

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The adenocarcinoma of the Treitz angle is extremely rare. Its symptoms are not specific, hence its often late diagnosis. In addition, this anatomical location is difficult to access to standard endoscopy, so it is very difficult to obtain a biopsy. The surgical procedure for adenocarcinoma of the angle of Treitz remains controversial. It’s hard to get a carcinological resection of this cancer. We report two new cases of adenocarcinoma from the Treitz angle with a literature review. Our objective is to discuss the clinical manifestations and circumstances of diagnosis, as well as the therapeutic modalities for adenocarcinomas of this location.

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Fronticelli, Carlo M. "Primary Adenocarcinoma of the Angle of Treitz." Archives of Surgery 131, no. 10 (1996): 1109. http://dx.doi.org/10.1001/archsurg.1996.01430220103025.

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Monib, Sherif, Mohamed Elkorety, Edward Renaudon-Smith, and Hany Habashy. "Primary adenocarcinoma of the angle of Treitz: A case report." International Journal of Case Reports and Images 11 (2020): 1. http://dx.doi.org/10.5348/101173z01sm2020cr.

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Xie, Yi-Bin. "Tumors of the angle of Treitz: A single-center experience." World Journal of Gastroenterology 20, no. 13 (2014): 3628. http://dx.doi.org/10.3748/wjg.v20.i13.3628.

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Beltran Miranda, P., J. A. Gonzalez Minchon, M. Alba Valmorisco, J. Candon Vazquez, D. Bejarano Gonzalez-Serna, and R. Balongo Garcia. "Management of Tumors of the 3rd-4th Duodenal Portion and Treitz Angle." HPB 24 (2022): S437. http://dx.doi.org/10.1016/j.hpb.2022.05.932.

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Miranda, P. Beltran, J. A. Gonzalez Minchon, M. Alba Valmorisco, D. Bejarano Gonzalez Serna, J. Candon vazquez, and R. Balongo Garcia. "Management of tumours of the 3rd–4th duodenal portion and Treitz angle." HPB 23 (2021): S965. http://dx.doi.org/10.1016/j.hpb.2021.08.633.

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Tursunov, Kapan T., S. A. Myrzakhmet, U. B. Alseitov, and E. G. Nasirova. "A CLINICAL OBSERVATION OF THE COMBINATION OF OMPHALOCELE WITH ATRESIA OF THE SMALL INTESTINE OF TYPE 3A IN A NEWBORN." Russian Journal of Pediatric Surgery 23, no. 5 (2019): 285–87. http://dx.doi.org/10.18821/1560-9510-2019-23-5-285-287.

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The authors present a clinical case of an extremely rare combination of the congenital defect of the front abdominal wall as omphalocele, congenital evolution defect of the small intestine - atresia of the small intestine type III, agenesis of the ileum with ileocecal angle and malrotation syndrome. Surgical treatment was as follows: T-shaped ileocolic «end-to-side» anastomosis with an unloading colostomy by the Bishop-Koop technique and intestinal intubaton till the Treitz ligament. Outcomes of such surgical correction are good.

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Dewoolkar, VV, U. Butale, and Pushpa Koli. "Adenocarcinoma at angle of treitz: A report of two cases with review of literature." Indian Journal of Cancer 45, no. 4 (2008): 179. http://dx.doi.org/10.4103/0019-509x.44669.

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Martinez, Luis R., Pablo Valsangiacomo, Gabriela Espinosa, Gabriela Wagner, and Roberto Taruselli. "Diverticulization Duodenal Distal Technique for Injury Angle Duodenojejunal." Open Medicine Journal 3, no. 1 (2016): 265–68. http://dx.doi.org/10.2174/1874220301603010265.

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Duodenojejunal injuries region at the angle of Treitz are rare, variable etiology and often associated with other serious injuries. In trauma situations with perforations and bleeding, his approach is often difficult. The primary suture, resection / anastomosis and duodenal exclusion are the usual for trauma management techniques in this region. The aim of this paper is to show the initial results of an alternative for injuries duodenojejunal angle (IDJA) by filling a retrospective, descriptive and observational technique, 12 patients operated were analyzed over a period of 15 years, carriers IDJA, age: 34, 11 gunshot wound. 92% of the cases had other associated visceral injuries. The average for the ISS was 29. In all cases located in duodenum duodenojejunoanastomosis II, via the right lateromesenterica upon closing section and duodenum level III was performed. 58% of cases were complicated. Mortality case series were 1 (8%) digestive suture failure colon. Average Hospital stay 26 days. Conclusion: A simple, safe and maintaining gut physiology is proposed technique; with a single anastomosis, located in well-vascularized area and away from bruising and contaminated areas. The complications were pancreatic fistula and digestive suture failure.

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Aroudam, Y., S. Zahraoui, M. Salihoun, et al. "Aorto-Duodenal Fistula: A Rare Cause of Upper Gastrointestinal Haemorrhage." Saudi Journal of Medicine 10, no. 03 (2025): 135–38. https://doi.org/10.36348/sjm.2025.v10i03.011.

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Digestive haemorrhage (HD) is a frequent reason for consultation at the Emergency Department. Approximately 80% of GI haemorrhages are upper GI, i.e. related to a lesion located above the angle of Treitz. The main causes are ulcer disease, portal hypertension, gastritis and ulcerated lesions of the stomach, and reflux oesophagitis. In approximately 10% of cases, a rarer cause (Mallory-Weiss, acquired vascular malformations, Dieulafoy, primary PAEF or secondary aortodigestive fistulas, biliary or pancreatic tract anomalies, tumours,...) is responsible. We report the case of a patient with high HD in whom aortoduodenal fistula was the cause diagnosed on abdominal CT.

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Ruso, Luis, Roberto Taruselli, Matthew Metcalfe, and Guy Maddern. "Resection of the Angle of Treitz and Distal Diverticulization of the Duodenum in Penetrating Abdominal Injuries." Digestive Surgery 21, no. 3 (2004): 177–81. http://dx.doi.org/10.1159/000079342.

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Imamura, Hajime, Tomohiko Adachi, Mampei Yamashita, et al. "Laparoscopic Segmental Resection for a Tumor in the Angle of Treitz: A Case Report and Surgical Video." Videoscopy 34, no. 1 (2024): 1–3. http://dx.doi.org/10.1089/vor.2024.0005.

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Salih, Abdesslam, Maria Lahlali, Asmae Lamine, et al. "VOMITING AND EPIGASTRALGIA: IS IT BOUVERET SYNDROME? ABOUT A CASE." International Journal of Advanced Research 12, no. 09 (2024): 513–16. http://dx.doi.org/10.21474/ijar01/19480.

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Bouverets syndrome is defined by a pyloroduodenal obstruction due to a blockage of a gallstone that has migrated through a cholecystoduodenal fistula. It is a rare entity from which the case of a 50-year-old patient presenting with vomiting with epigastralgia is reported, in whom abdominal ultrasound objectified an aerobic cholecystitis with cholecysto-duodenal fistula CT confirmed the ultrasound data and showed an enclosed gallstone at the duodenal level as well as oesogastroduodenalfibroscopy. The laparotomy objectified: a gallbladder attached to the genus superius with a stone measuring 4 cm which migrated at the level of the Treitz angle, the gesture consisted in the extraction of the stone and retrograde cholecystectomy as well as the resection of the fistulous path.

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Crema, Eduardo, Eliane Anrain Trentini, and Juan Carlos Llanos. "Proposal of a new technique for bile duct reconstruction after iatrogenic injury: study in dogs and review of the literature." Acta Cirurgica Brasileira 22, no. 3 (2007): 162–67. http://dx.doi.org/10.1590/s0102-86502007000300002.

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PURPOSE: Interposition of a jejunal tube between the common bile duct and duodenum. METHODS: Five adult mongrel dogs of both sexes, weighing on average 22.3 kg (18 to 26.5 kg), were used. Obstructive jaundice was induced by ligation of the distal common bile duct. After one week, a 2.5-cm long jejunal tube was fabricated from a segment of the loop removed 15 cm from the Treitz angle and interposed between the common bile duct and duodenum. RESULTS: The animals presented good clinical evolution and no complications were observed. After 6 weeks, complete integration was noted between the bile duct mucosa, tube and duodenum and a significant reduction in total bilirubin and alkaline phosphatase was observed when compared to the values obtained one week after ligation of the common bile duct. CONCLUSION: The jejunal tube interposed between the dilated bile duct and duodenum showed good anatomic integration and reduced total bilirubin and alkaline phosphatase levels in the animals studied.

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Kirby, GC, ER Faulconer, SJ Robinson, A. Perry, and R. Downing. "Superior mesenteric artery syndrome: a single centre experience of laparoscopic duodenojejunostomy as the operation of choice." Annals of The Royal College of Surgeons of England 99, no. 6 (2017): 472–75. http://dx.doi.org/10.1308/rcsann.2017.0063.

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INTRODUCTION The superior mesenteric artery (SMA) syndrome, or Wilkie’s syndrome, is a rare cause of postprandial epigastric pain, vomiting and weight loss caused by compression of the third part of the duodenum as it passes beneath the proximal superior mesenteric artery. The syndrome may be precipitated by sudden weight loss secondary to other pathologies, such as trauma, malignancy or eating disorders. Diagnosis is confirmed by angiography, which reveals a reduced aorto-SMA angle and distance, and contrast studies showing duodenal obstruction. Conservative management aims to increase intra-abdominal fat by dietary manipulation and thereby increase the angle between the SMA and aorta. Where surgery is indicated, division of the ligament of Treitz, anterior transposition of the third part of the duodenum and duodenojejunostomy have been described. METHODS We present four cases of SMA syndrome where the intention of treatment was laparoscopic duodenojejunostomy. The procedure was completed successfully in three patients, who recovered quickly with no short-term complications. A fourth patient underwent open gastrojejunostomy (complicated by an anastomotic bleed) when dense adhesions prevented duodenojejunostomy. CONCLUSIONS The superior mesenteric artery syndrome should be considered in patients with epigastric pain, prolonged vomiting and weight loss. Laparoscopic duodenojejunostomy is a safe and effective operation for management of the syndrome. A multi-speciality team approach including gastrointestinal, vascular and radiological specialists should be invoked in the management of these patients.

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Caruso, Francesco, Marco Nencioni, Arianna Zefelippo, Giorgio Rossi, and Lucio Caccamo. "Is Duodenojejunal Anastomosis to the Left of the Superior Mesenteric Vessels a Feasible Option for Tumors of the Angle of Treitz?" Tumori Journal 102, no. 2_suppl (2016): S71—S73. http://dx.doi.org/10.5301/tj.5000391.

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Diallo, AC, A. Ndong, I. Niang, et al. "Giant jejunal gasto-intestinal stromal tumor: A rare cause of abdominal mass in an elderly female." African Journal of Oncology 1, no. 2 (2021): 65–67. http://dx.doi.org/10.54266/ajo.1.2.65.xvep9876.

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OBJECTIVE: We report the case of a patient presenting an abdominal mass whose final diagnosis is a gastrointestinal stromal tumor (GIST). CLINICAL OBSERVATION: It was a 61-year-old patient with no pathological history received for a progressive increase in the volume of the abdomen evolving for one year and painless. On examination, the patient was in good general condition, with normal patterns. There was an abdomino-pelvic mass of about 20 cm long axis, mobile. The rest of the exam was unremarkable. The biological assessment was normal. Abdominopelvic computed tomography revealed a tissue mass with necrosis. During the surgical exploration, a mass developed on the mesenteric border 45 cm from the Treitz angle was noted. It is not associated with ascites or peritoneal carcinoma. Bowel resection removing the mass was performed followed by end-to-end anastomosis. Pathological examination of the surgical specimen diagnosed GIST. The postoperative course at three months was excellent both clinically and radiologically. CONCLUSION: The case that we report underlines the possible jejunal localization of GIST and the clinical presentation may be usual. It also shows the difficulty of obtaining a preoperative diagnosis and the central role of surgery in management.

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Rocha, Mércia Maria Braga, José Luiz Martins, Paulo Tubino, and Andréa Bischoff. "Viability of a jejunal segment after neovascularization by omentoenteropexy." Acta Cirurgica Brasileira 17, no. 6 (2002): 377–80. http://dx.doi.org/10.1590/s0102-86502002000600004.

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Omentoenteropexy was developed as an alternative technique to promote neovascularization in an isolated bowel segment. OBJECTIVE: The aim of the present protocol was to study the long-term viability of an isolated jejunal segment following neovascularization by omentoenteropexy. Long-term survival of a neovascularized bowel segment is an indication that the utilization of this segment as an intestinal graft can be successful. METHODS: To test the proposed surgical technique, 13 Wistar rats were subjected to laparotomy, the jejunum was exposed at 20 cm from the angle of Treitz and a pedicle of greater omentum was isolated. An incision of 6 cm was made along the antimesenteric jejunal border, exposing the submucosa. Omentoenteropexy was performed between the incision of the jejunum and the pedicle of the greater omentum. After seven weeks, the mesentery of the jejunal segment subjected to omentoenteropexy was ligated and isolated from the rest of the jejunum by a complete proximal and distal transversal section. Subsequently, an end-to-end anastomosis was performed to restore the continuity of the bowel. RESULTS: At 10 weeks from the first surgical intervention, the isolated jejunal segment subjected to omentoenteropexy was completely neovascularized and viable. CONCLUSION: No evidence of anatomical or functional intestinal obstruction was observed.

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Cukier, Celso, Dan L. Waitzberg, Viviane Chaer Borges, Maria de Lourdes T. Silva, Joaquim Gama-Rodrigues, and Henrique Walter Pinotti. "Clinical use of growth hormone and glutamine in short bowel syndrome." Revista do Hospital das Clínicas 54, no. 1 (1999): 29–34. http://dx.doi.org/10.1590/s0041-87811999000100007.

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Growth hormone (GH) and glutamine (GLN) are considered bowel trophic factors and are used experimentally after bowel resection. Their clinical uses in short bowel syndrome (SBS) are still not standardized. It is of interest to verify metabolic, nutritional and side effects of the association of GH and GLN in SBS. Three patients, 39 (A), 33 (B), and 01 years old (C) underwent bowel resection with jejunum anastomosis 15 cm (A) and 60 cm (B) distant from the Treitz angle, and 40 cm (C) preserving the ileo cecal valve. GH Saizen (Serono - A), Genotropin (Pharmacia - B), and Norditropin (Novonordisk C) were administered in doses of 0.14 mg /kg/day. GLN (0.4 g/kg/day) was given orally for 10 days (A), 30 days (B) and 60 days to patient C (0.28 g/kg/day). Central TPN and adequate oral diet was administered according to the bowel adaptation phase. On the first day after beginning treatment patient A exhibited symptoms of hypoglycemia. There were no other side effects. After treatment, body weight was higher and analysis by bioelectrical impedance showed more lean mass and less fat mass compared to pre-treatment measurements. Nitrogen retention was progressively higher with treatment. Simultaneous treatment with GH and GLN does not cause significant side effects, and is associated with a favorable distribution of the body compartments and nitrogen retention in patients with the short bowel syndrome.

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Nantes, Alvaro Gastaldi, Glenda Maria Abreu, Guilherme Henrique Pereira de Ávila Borges, et al. "Main Characteristics of Lower Gastrointestinal Bleeding in Patients Treated at a Reference Hospital." Journal of Coloproctology 45, no. 01 (2025): e1-e7. https://doi.org/10.1055/s-0045-1804895.

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AbstractLower gastrointestinal bleeding (LGB) originates below the angle of Treitz and can result from vascular, inflammatory, neoplastic, or traumatic causes. This study analyzed the clinical and epidemiological profiles of LGB patients treated at Hospital Regional do Mato Grosso do Sul from 2017 to 2022, exploring the relationship between LGB etiology and colonoscopy performance. A retrospective analysis of 303 patients examined variables such as year of service, management approach, hospital stay, Oakland score, age, sex, and race. Most patients were hospitalized between 2018 and 2019, with hospitalization being the primary management strategy. The majority were male (59.4%), over 60 years old (55.1%), and mixed race (53.5%). The mean length of hospital stay was 10.6 days, and the average Oakland score was 20.28. Clinical findings showed 64.7% had no prior LGB history, with an average systolic blood pressure of 91.24 mmHg and a heart rate of 129.61 bpm. Colonoscopy revealed diverticular disease as the most common finding (39.6%), and the most frequent bleeding types were enterorrhagia (47.5%) and melena (37.0%). Significant associations were found between bleeding type, hemoglobin levels, and outcomes, with melena linked to lower hemoglobin levels and higher mortality. Colonoscopy results were also associated with outcomes, showing higher mortality in colitis patients. These findings emphasize the impact of clinical and demographic factors in LGB management and suggest further research into targeted interventions.

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Azevedo, João Luiz Moreira Coutinho, Octávio Hypólito, Otávio Cansanção Azevedo, Otávio Monteiro Becker Jr., and Dalmer Faria Freire. "Comparative study of hand sewn single layer anastomosis of dog's bowel." Arquivos de Gastroenterologia 45, no. 4 (2008): 319–22. http://dx.doi.org/10.1590/s0004-28032008000400011.

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BACKGROUND: Two-layer intestinal anastomosis increases the inflammatory response while single-layer anastomosis results in a better wound healing. However the four main kinds of stitches which may be chosen in performing single layer intestinal sutures never before had been comparatively studied. AIM: To compare the four more commonly used types of single layer surgical anastomosis sutures of the digestive tract. METHODS: Six mongrel dogs were operated, each one receiving two anastomosis: one at 30 cm from de Treitz angle - sero-submucosal technique, and the other at 60 cm - total technique. This placement was alternatively inverted. The four more commonly used types of single layer surgical anastomosis sutures of the digestive tract, namely: sero-submucosal stitches tied in the lumen, over the submucosa; sero-submucosal stitches tied in the exterior of the organ, over the serosa; total stitches tied in the lumen, over the mucosa; and total sutures tied in the exterior, over the serosa (Gambee's stitches) were tested. After euthanasia (7th post-operative day) macro and microscopic features were evaluated. Friedman's test was applied for morphometry and for evaluation of the peritoneal adhesions. RESULTS: Statistical significance was demonstrated through major residual acute inflammation and proliferation in total sutures and more profuse adhesions with the sero-submucosal stitches tied in the lumen. The sero-submucosal stitches tied in the exterior over the serosa, had excellent realignment and regeneration of the layers. CONCLUSION: The sero-submucosal stitches tied in the exterior, over the serosa, were the best ones.

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Gramática (h), Luis, Andrés Mercado Luna, Diego Bono, et al. "Yeyunostomía de alimentación en cirugía. Contribución técnica y experiencia." Revista de la Facultad de Ciencias Médicas de Córdoba 58, no. 1 (2001): 87–92. http://dx.doi.org/10.31053/1853.0605.v58.n1.37035.

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The necessity to maintain the nutritional integrity in patients subjected to major surgery of the superior digestive tract has been broadly accepted. The enteral nutrition for yeyunostorny is accepted as more physiologic, sure and effective than the parenteral one. Materials ami Method: 171 yeyunostomies were indicated in: 151 patients with rnahignant neoplasm of the superior digestivelract, 15 with infected pancreatíc necrosis, 3 hi le-duodenum-pancreatic traumatisms and in 1 stenosis for gastroesophagic reflux.Depending on the pathological type, a yeyunostorny using the Witzell technique was carried out with either local or generalanesthesia ata 15 to 20 cm. of the Treitz angle. To facihitate the fixation of the catheter and to avoid the stenosis of the jejunum we have incorporated, as an original technical detail, the proximal serous section with cold scalpel in about 4 cm, that is to say in the sector to be tunneled. Results: There was not mortality in relation to the yeyunostomy. Among the minor complications we crnphasize the abdominal distension, cohic pain and diarrhea, situations that were reverted, controlling the debit and the feedi ng characteri sties. This approach could be maintained for period of 2 months and in sorne cases at home.Conclusions: Wc emphasize the great importance of the enteral feeding for yeyunostomy, for its of easy handling, securityand low cost that, together with the suggested technical detail, has allowed us to obtain a deeding road almost without inherentcomplications.

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Arjona Bojórquez, Rashid I., Isidro R. Puerto Serrano, Aron Cervantes Sanchez, et al. "Grade V small bowel injury after blunt abdominal trauma: a case report." International Journal of Research in Medical Sciences 10, no. 8 (2022): 1778. http://dx.doi.org/10.18203/2320-6012.ijrms20221995.

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Injury of the small intestine or mesentery that requires surgical intervention is relatively uncommon, presenting less than 1% of all trauma. Unstable hemodynamically patients with peritoneal irritation signs and stable hemodynamically patients with radiological signs of intestine or mesentery lesions need an exploratory laparotomy. A 33-year-old male patient, suffered a car accident in which he had a frontal impact collision and was between two structures for 30 minutes, and rescued by the fire department. Physical examination of the abdomen presents generalized pain on palpation of moderate intensity and rebound sign. An exploratory laparotomy was performed, the findings were: hemoperitoneum of 1500 ml was found, lesion in the bucket loop of 1.2 meters, 1.8 meters from the Treitz angle and 70 cm from the ileocecal valve. We managed with drainage, vascular control, resection of the devascularized intestinal loop and small bowel shotgun stoma were. The patient was transferred to the intensive care unit for hemodynamic management and a second look was performed 5 days after surgery where cavity lavage, stoma dismantling and end-to-end anastomosis of the small intestine in two planes were performed. On post-operative day 7 drains were removed, and the patient was discharged from the surgical service due to improvement, without complications. We recommend a multidisciplinary approach to patients with polytrauma, since they lead to a better and faster recovery, in the same way it allows us to detect and treat any abnormality that impacts the quality of life of patients early.

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Șoitu, M. A., Elena Neștian, C. Botezatu, and B. Mastalier. "RARE PRIMARY SMALL BOWEL TUMOR IN THE FORM OF CLASSIC KAPOSI’S SARCOMA: CASE PRESENTATION." Journal of Surgical Sciences 5, no. 3 (2018): 153–60. http://dx.doi.org/10.33695/jss.v5i3.229.

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The small bowel represents a rare site for primary neoplasms, with an incidence of less than 2% ofall that are located in the digestive tract. The early diagnosis of these tumors is often difficult due tothe lack of specificity of the clinical presentation, but it can make a difference in matters of 5-yearsurvival rates: 83% (early detection) versus 14% (late detection). We present the case of a malepatient, aged 66, with an apparently benign jejunal ulcer diagnosed endoscopically. Clinicalpresentation: diffuse abdominal pain, fatigability, melena; paraclinical evaluation: anemia,positive occult gastrointestinal bleeding test, superior and inferior endoscopy withouthemorrhagic lesions. The surgical exploration guided by intramucosal dye discovers a 2 cmtumor, 250 cm distal to the angle of Treitz with multiple mesenteric adenopathies. Segmentalresection is performed keeping oncological safety margins with the removal of the lymphaticdrainage elements. The postoperative evolution is favorable and leads to complete healing. Thehistopathological assay finds pathological changes consistent for Kaposi’s sarcoma and confirmsthe presence of HHV-8 in the nuclei of the tumor cells by means of immunohistochemistry. At theexamination of the skin, multiple purple patches were discovered. The particularity of this case isthat the Kaposi’s sarcoma manifests itself in the absence of an immunosuppressive treatment or animmunodeficiency state induced by an HIV infection. Although rare, the small intestine tumorsshould be considered when non-specific abdominal pain is accompanied by positive occult bleedingtest, with scarce endoscopic evidence. Since the Kaposi’s sarcoma is a highly angiogenic tumor, itis prudent to include it in the differential diagnosis when suspecting a source of gastrointestinalbleeding.

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Sergio, Susmallian, Adler Samuel, Barnea Royi, and Paran Haim. "Endoscopic Polypectomy: An Option to Treat Small Bowel Bleeding. A Case-Report." International Journal of Case Studies 5, no. 6 (2016): 09–14. https://doi.org/10.5281/zenodo.3531344.

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Background: Bleeding of the digestive tract in elderlies must provoke a significant deterioration to patient in a crisp stable condition. Capsule endoscopy provides excellent visualization of the small intestine, is well tolerated by patients, and is safe. Our interest is to present the use of well-known techniques that exist today in every hospital used in combination to treat cases that otherwise would need a greater and extensive surgical intervention. Methods: A patient was admitted to the surgery department from the emergency room with symptoms of melena for the last two days. After 48 hours enteroscopy and colonoscopy were performed and no pathology was found. Under general anesthesia and supine position, insufflation of the abdomen was performed trough a Veress needle inserted in the upper left quadrant. Three trocars were inserted in the right abdomen in the same time, from the abdomen were movilizated the omentum and the transverse colon to the upper abdomen, when the scope entered to the Treitz the gastroenterologist placed the scope curved in a right angle. Results: After recognizing the polyp, we kept the intestine with the graspers without any movement to facilitate the excision of the polyp by the gastroenterologist. The polyp was more than 7 millimeters and was excise using hot snare. After 6 month follow-up the patient doesn't suffer from bleeding and remains with stable hemoglobin. Conclusions: Using the laparoscopy as a method of roll up the gut to bring the pathology to the endoscope eye appears as an excellent tool for treatment.

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Lambertini, Nathalia Ribeiro, Priscila Alves da Silva, and Ângelo Flávio Adami. "Tumor Estromal Gastrointestinal na Transição Duodeno-Jejunal em Idoso - Relato de Caso / Gastrointestinal Stromal Tumor in Transition Duodenum-Jejunal in Elderly - Case Report." REVISTA CIÊNCIAS EM SAÚDE 6, no. 3 (2016): 152–61. http://dx.doi.org/10.21876/rcsfmit.v6i3.586.

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Objetivo: relatar um caso de Tumor Estromal Gastrointestinal (GIST), localizado na parede da transição duodeno-jejunal, em paciente idoso, acima de 80 anos. Relato do Caso: paciente de 84 anos, com histórico de epigastralgia e anemia a esclarecer, realizou ecografia e tomografia computadorizada de abdome total, que evidenciaram uma massa na altura do ângulo de Treitz. Na tentativa de se biopsiar a massa, foi realizada uma endoscopia digestiva alta, mas por risco de sangramento iminente da paciente, o exame foi interrompido e posteriormente, a paciente foi submetida à pancreatoduodenectomia com linfoadenectomia para a ressecção do tumor e análise anatomopatológica do mesmo. Discussão: o tratamento preconizado desta neoplasia é geralmente cirúrgico. A massa apresentava 8,0 cm em seu maior eixo, com áreas focais necróticas/hemorrágicas e índice mitótico de 02/50 HPF. Essas características foram determinantes para a classificação do tumor, com risco intermediário para agressividade biológica ou malignidade. Como a massa foi completamente ressecável, não houve a necessidade da terapia medicamentosa específica para esta patologia, o mesilato de imatinibe. Conclusão: por se tratar de um tumor em idoso acima de 80 anos, com localização rara e pela consequente escassez de informações disponíveis, essa afecção se torna subdiagnosticada no Brasil. Portanto, este caso é relevante na medida em que, visa colaborar para o conhecimento mais detalhado da doença, direcionamento do tratamento e prognóstico da mesma.Palavras-Chave: Tumores do Estroma Gastrointestinal, Intestino Delgado, Idosos de 80 anos ou maisABSTRACTObjective: to report a case of Gastrointestinal Stromal Tumor (GIST) located on the wall of duodenal-jejunal transition in elderly patient, above 80 years of age. Case Report: a patient, 84 years old, with epigastric pain history and anemia to be enlightened, was submitted to an ultrasound and CT scan of the abdomen which showed a mass in the height of the angle of Treitz. In an attempt to biopsy the mass, upper gastrointestinal endoscopy was performed, but because of imminent risk of patient’s bleeding, the exam was stopped. The patient was then submitted to a pancreatic duodectomy with limphoadenectomy for resection of the tumor and histopathological analysis of the same. Discussion: the recommended treatment of this neoplasia is usually surgical. The mass showed 8.0 cm in its greatest shaft with necrotic/ hemorrhagic focal areas and mitotic index of 02/50 HPF. These features were decisive for the classification of the tumor in a intermediate risk to biological aggression or malignancy. As the mass was completely resectable, there was no need for drug therapy for this pathology, imatinib mesylate. Conclusion: because it is a tumor in elderly over 80 years, with rare location and the consequent lack of available information, this disease becomes under-diagnosed in Brazil. Therefore, this case is relevant for in aims to collaborate for more detailed knowledge of the disease, targeting the treatment and prognosis.Keywords: Gastrointestinal Stromal Tumors, Small Intestine, Elderly 80 and over

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Solís-Reyna, Víctor Hugo. "Segmental Mesenteric Thrombosis as the Initial Manifestation of Primary Thrombophilia: Clinical Case." Journal of Biomedical Engineering and Medical Imaging 11, no. 5 (2024): 225–30. https://doi.org/10.14738/bjhmr.115.17687.

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Introduction: Acute mesenteric ischemia is caused by interruption of the blood supply to the intestine, leading to cell damage, intestinal necrosis, and often death of the patient if untreated. AMI can be occlusive or non-occlusive, with primary etiology defined as mesenteric arterial embolism (50%), mesenteric arterial thrombosis (15-25%) or venous thrombosis (5-15%). Clinical case: A 54-year-old male presented to the emergency room with abdominal pain, vomiting, and hypotension. Important history: Systemic arterial hypertension 2 years after diagnosis, without pharmacological treatment, without other important history upon admission. His Current Condition begins: 24 hours prior to admission, with diffuse abdominal pain, of moderate intensity that partially subsides to the administration of NSAIDs, subsequently he presents fever and general malaise, vomiting of gastro-alimentary content is added and he goes to a rural clinic where he is evaluated and referred to a second level hospital. Exploratory Laparotomy reported the following findings: necrotic area of 5 cm that covers the entire circumference located at 20 cm from the Angle of Treitz, Total necrosis of the small intestine that involves approximately 70 cm located at 40 cm of the ileocecal valve. Generalized Peritonitis; Resection and manual anastomosis were performed in two planes, resection of 70 cm of terminal ileum, closure of the ileal stump and terminal ileostomy. He had an adequate post-surgical evolution and was discharged due to improvement. Discussion: Surgical intervention aims to evaluate and remove any unsalvageable intestine, prevent further intestinal infarctions with urgent revascularization, and preserve the small intestine. This often involves a midline laparotomy, which allows direct visualization of the intestine to evaluate blood flow through the mesenteric vessels, observe abnormalities of color or appearance of the intestinal serosa, and monitor peristalsis. Additional techniques such as intravenous fluorescein, Doppler, or intraoperative laser angiography may also be used. used to evaluate perfusion.

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Chajai, Salim, Rihab Ziyat, Hicham Ziani, et al. "Upper Gastrointestinal Bleeding in the Emergency Department of Ibn Sina Hospital in Rabat: Etiological, Endoscopic, Therapeutic and Evolutive Aspects." SAS Journal of Medicine 12, no. 05 (2024): 390–93. http://dx.doi.org/10.36347/sasjm.2024.v10i05.021.

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Introduction: Upper gastrointestinal bleeding (UGIB) is defined as a bleeding from a lesion in the digestive tract located upstream of the duodenojejunal angle of Treitz. It is a medical emergency with a mortality ranging from 2 to 10%. The aim of the study is to investigate the main etiologies of upper gastrointestinal bleeding in our setting, and specify the main endoscopic findings, therapeutic approaches, and evolutive aspects. Materials and methods: A prospective, descriptive study conducted over an eight month period from May 1st to December 1st, including 50 adult patients admitted for UGIB who underwent conclusive esophagogastroduodenoscopy (EGD). We collected data about patients demographics, comorbidities, clinical presentaiton, physical examination findings, laboratory data, EGD results, therapeutic procedures and patient outcomes. Results: UGD represented 0.5% of emergency admissions, with a mean age of 61.22 years and no gender predominance. The main risk factors were related to the use of anticoagulants and/or antiplatelet agents, a history of chronic liver disease, chronic gastritis, and alcohol and tobacco use. Patients presented with hematemesis, melena, or both. EGD was performed in all patients, the main etiologies were peptic ulcer disease, vatical pathology and peptic pathology. Endoscopic treatment was performed in 38% patients, surgery was required in one case. Red blood cell transfusion was necessary in 83% patients. A favorable outcome was observed in 84% patients, while 16% patients died because of hemorrhagic shock, cardiogenic shock, and one case of multiple myeloma. Conclusion: UGIB remans a common medical and surgical emergency in our setting. The etiologies are dominated by peptic ulcer disease. EGD is the key investigation, with a diagnostic, therapeutic, and prognostic interest. The outcome was generally favorable in our study, except for 16% of cases who resulted in death. Preventive measures are essential.

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Ahbala, Tariq, Mohamed Benchouk, Momamed Lamine Elmansouri, WafaeAit Belaid, Khalid Rabbani, and Abdelouahed Louzi. "SMALL BOWEL OBSTRUCTION DUE TO MECKELS DIVERTICULUM IN ADULTS: CASE REPORT." International Journal of Advanced Research 12, no. 11 (2024): 10–15. https://doi.org/10.21474/ijar01/19810.

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Meckels diverticulum is the partial persistence of the omphalomesenteric duct during the seventh week of gestation [1]. It is the most common congenital anomaly of the gastrointestinal tract with a slight male predominance [1]. It is rare and is encountered in 2 to 4% of the population [2]. Meckels diverticulum is usually, but it can be revealed by complications such as: intestinal obstruction, perforation, fistula and tumor degeneration [3].We report in this work the clinical case and management of small bowel volvulus on Meckels diverticulum, observed in theUniversity Hospital center of Marrakech in a 19-year-old adult in March 2023, this is a patient without medical history admitted to the emergency with acute abdomen made up of abdominal pain, vomiting and fever. The physical examination aimed abdominal bloating and generalized defense. Biology shows an inflammatory syndrome.Abdominal Computed tomography scan in the emergency shows a distension of the small bowel measuring 36mm, with hydroaeric levels, no disparity in caliber, associated with moderate peritoneal effusion.The patient was operated by median laparotomy. Surgical exploration revealed distension of the bowel upstream of a flange taking up an inflamed Meckels diverticulum, 6cm long and 2cm in diameter, situated on the anti-mesenteric edge, 2.30 meters from the Treitz angle and 70cm from the ileo-caecal junction, adhering to the root of the mesentery. It was around this diverticulum that the small intestine had volvulated but was viable. The appendix was normal size. The surgical procedure consisted of a losangicdiverticulectomy preserving the supporting loop of bowel and transverse suture of the loop of bowel using separate stitches.Postoperative recovery was straightforward. Discharge was authorized on the 6th day.Histo-pathological examination showed fibrous tissue with a dense, diffuse inflammatory infiltrate, compatible with a lesion of non-specific gastric diverticulitis.It is important to be aware of the complications of Meckels diverticulum in the presence of acute abdominal pain, to guide surgical management as effectively as possible.

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Linhares, Glauber Kazuo, José Luiz Martins, Fernanda Fontanezzi, Francy dos Reis Patrício, and Edna Frasson de Souza Montero. "Do lesions of the enteric nervous system occur following intestinal ischemia/reperfusion?" Acta Cirurgica Brasileira 22, no. 2 (2007): 120–24. http://dx.doi.org/10.1590/s0102-86502007000200008.

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PURPOSE: To evaluate tissue lesions, especially those of the intestinal innervation, in an excluded jejunal loop subjected to ischemia and reperfusion in rats. METHODS: To evaluate the role of ischemia and reperfusion lesions in an excluded intestinal loop, four groups of 20 rats were set up: control group (GCEI7) and three experimental groups (GIREI7, GIREI14 and GIREI28). They were all subjected to exclusion of an intestinal segment of six centimeters in length, at a distance of 10 centimeters from the Treitz angle. The 60 animals in the three experimental groups were additionally subjected to ischemia of the vascular pedicle for 30 minutes. The control group and the experimental group GIREI7 were evaluated on the 7th day after the operation. The groups GIREI14 and GIREI28 (which also underwent ischemia) were utilized to evaluate the evolution of the lesion over time, on the 14th and 28th days after the operation, respectively. From the intestinal excluded loop, we take one ring of 0,5 cm distal and proximal, that were fixed in formaline 10% solution in order to do histological (HE) and immuno-hystochemial (PS-100) evaluation (enteric nervous system.) The distal loop was exteriorized in stoma and the proximal part closed with polipropilene 6-0. RESULTS: It was observed a decrease in the number of ganglionic cells in the myenteric plexus in the group subjected to ischemia and reperfusion (GIREI7), in relation to the control group (GCEI7) at the 7th post-operative day (Mann-Whitney test: p = 0.0173 *. Comparing the numbers of ganglionic cells in the myenteric plexus before and after jejunal loop exclusion GCEI7 - (Wilcoxon test: p = 0.0577). GIREI7 - Comparing the numbers of ganglionic cells in the myenteric plexus before and after ischemia (*p = 0.0399). Comparing the percentage variations in ganglionic cells in the myenteric plexus on the 7th, 14th and 28th days after the procedure, in the groups GIREI7, GIREI14 and GIREI28, it was observed that there were no significant alterations. Kruskal-Wallis test: p = 0.6501. CONCLUSION: There was a decrease in the number of ganglionic cells in the myenteric plexus due to ischemia and reperfusion that did not recover in the late post-operative period.

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Nathan, P. J., and S. N. Singh. "Sliding Mode Control and Elastic Mode Stabilization of a Robotic Arm With Flexible Links." Journal of Dynamic Systems, Measurement, and Control 113, no. 4 (1991): 669–76. http://dx.doi.org/10.1115/1.2896473.

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This paper treats the question of control of an elastic robotic arm of two links based on variable structure system (VSS) theory and pole assignment technique for stabilization. A discontinuous joint angle control law, based on VSS theory, is designed which accomplishes asymptotic decoupled joint angle trajectory tracking. In the closed-loop system, the trajectories are attracted toward a chosen hypersurface in the state space and then slide along it. Although, joint angles are controlled using variable structure control (VSC) law, the flexible modes of the links are excited. Using center manifold theory, it is shown that the closed-loop system, including the sliding mode controller, is stable. Based on a linearized model about the terminal state, a stabilizer is designed using pole assignment technique to control the elastic oscillations of the links. A control logic is included which switches the stabilizer at the instant when the joint angle trajectory enters a specified neighborhood of the terminal state. Simulation results are presented to show that in the closed-loop system, accurate joint angle trajectory tracking, and elastic mode stabilization are accomplished in the presence of payload uncertainty.

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Natriashvili, Tamaz, Paata Dolidze, Roman Kenkishvili, and Vakhtang Mamaladze. "Research of the International Experience of Arrangement of Proving Grounds Passable Terrain for Wheeled and Tracked Military Vehicles." თავდაცვა და მეცნიერება 1 (April 25, 2022): 18–24. http://dx.doi.org/10.61446/ds.1.2022.6453.

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The article presents the project data of construction designs for an estimation of passability of wheeled and tracked military vehicles for checking the parameters that are accepted as obligatory within the North Atlantic Treaty Organization (NATO). In particular, the constructions for determining the following parameters of passability are considered: ground clearance; angles of approach and departure; angle of climb; minimum turning radius; corridor width while turning with minimum radius; maximum angles of overcome gradients and side slope; maximum width of overcome vertical-sided ditch; maximum heights of overcome vertical wall and step; drawbar pull, speed and acceleration during mobility on the soft soil; and maximum depth of overcome water during fording. The project data is selected from the data of proving grounds for wheeled and tracked military vehicles and the relevant documents of the USA and the Russian Federation so that they don’t come in a contradiction with publications of the NATO.

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Zweiri, Y. H., J. F. Whidborne, and L. D. Seneviratne. "Detailed analytical model of a single-cylinder diesel engine in the crank angle domain." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 215, no. 11 (2001): 1197–216. http://dx.doi.org/10.1243/0954407011528734.

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A detailed analytical non-linear dynamic model for single-cylinder diesel engines is developed. The model describes the dynamic behaviour between fuelling and engine speed and includes models of the non-linear engine and dynamometer dynamics, the instantaneous friction terms and the engine thermodynamics. The model operates in the crank angle domain. The dynamometer model enables the study of the engine behaviour under loading. The instantaneous friction model takes into consideration the viscosity variations with temperature. Inertia variations with piston pin offset are presented. In-cycle calculations are performed at each crank angle, and the correct crank angles of ignition, speed variations, fuel supply and air as well as fuel burning rate are predicted. The model treats the cylinder strokes and the manifolds as thermodynamic control volumes by using the filling and emptying method. The model is validated using experimentally measured cylinder pressure and engine instantaneous speeds, under transient operating conditions, and gives good agreement. The model can be used as an engine simulator to aid diesel engines control system design and fault diagnostics.

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Harefa, Jesslyn Elisandra, Muhammad Rafie Akbar, Ari Ghazy Putra Asto, and Muhammad Abdul Aziz Bin Ibrahim. "Legacy of the Anglo-Dutch Treaty 1824." Neoclassical Legal Review: Journal of Law and Contemporary Issues 3, no. 1 (2024): 28–39. http://dx.doi.org/10.32734/nlr.v3i1.15583.

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The Anglo-Dutch Treaty of 1824 is a pivotal historical milestone, delineating territorial boundaries and shaping the trajectories of British and Dutch colonial empires in Southeast Asia. Beyond its geopolitical implications, this treaty exerted profound and enduring social effects on the indigenous populations of Indonesia and Malaysia. This article endeavors to elucidate the nuanced social consequences of the treaty, emphasizing its role in molding the fabric of societal life and legal frameworks in these two nations. Through a comprehensive analysis of the treaty's stipulations, subsequent legal evolutions, and their ramifications on local communities, this study aims to unravel the intricate tapestry of influence that emanated from colonial decisions. Specifically, we delve into how the Anglo-Dutch Treaty of 1824 was pivotal in shaping the formation and development of social structures and legal systems in Indonesia and Malaysia. By scrutinizing the long-term effects on indigenous societies, this research contributes to a deeper understanding of the enduring impact of colonial legacies on the contemporary legal landscape of these nations. This article offers valuable insights into the lasting repercussions of a historical agreement that extended beyond mere territorial delineation. By exploring the intricate interplay between the treaty's provisions and the subsequent socio-legal developments, we gain a nuanced understanding of the enduring ramifications of colonial decisions on the present-day legal frameworks in Indonesia and Malaysia.

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Benham, Jenny. "The earliest arbitration treaty? A reassessment of the Anglo-Norman treaty of 991*." Historical Research 93, no. 260 (2020): 189–204. http://dx.doi.org/10.1093/hisres/htaa001.

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Abstract Concluded at Rouen in March 991, the Anglo-Norman treaty has traditionally occupied a very small corner of the huge historiography for King Æthelred’s reign as one of the first of the king’s failures to deal with the threat of renewed viking raids. This article is an attempt to rethink the place and importance of this treaty in the scholarly literature by looking at it from the perspective of how diplomacy was practised in the earlier middle ages. It reveals the treaty as the earliest arbitration treaty in the medieval West and offers alternative ways of viewing the immediate context and circumstances of the negotiations, as well as the persistence of important diplomatic practices across a long period.

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Chung, W.-Y. "Type determination and analysis of mobility region for bimodal linkages." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 12 (2008): 2495–503. http://dx.doi.org/10.1243/09544062jmes960.

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A bimodal linkage has two potential output angles for any given input angle and vice versa. The analysis treats all bimodal linkages as a common problem. A conic curve is derived from the general input—output equation. The mobility regions of any concerned link are then attained from the intersection points between the conic curve and a unit circle with the aid of corresponding differentiation. The linkages with one axis of the conic curve passing through the origin are classified as a selective group. The concise criteria for type determination exist for this group, and the strategies to derive them straightforwardly are developed. Unlike Grashof's rule, which is only applicable to planar four-bar, the criteria developed can be used to determine the type efficiently for all linkages belonging to this selective group and are certainly preferable. The linkages with prismatic output are also considered. Several examples including RPSPR, RPSC, RSSR, and RSSP linkages are given for illustration.

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Ciuclea, Mihaela, Dumitru Sirbu, Stanislav Strisca, Stanislav Eni, and Daniel Sirbu. "Surgical treatm ent of dento maxillary anomalies class III angle. Clinical case." Journal of Stomatological Medicine 3, no. 59 (2021): 26–34. http://dx.doi.org/10.53530/1857-1328.21.59.04.

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Dento-maxillary anomalies are relatively widespread among the population, eventually leading to serious psychological and lifestyle deterioration. The purpose of this paper is to evaluate the complex orthodontic-surgical treatment in the dento-maxillary anomaly class III Angle. We aim to present the clinical case of a female patient suffering from skeletal third-class, gnathic form, who came to „Omni Dent” clinic in order to complete the second stage of associate orthodontic and surgical treatment. Medical investigations: OPG, CBCT, TRG, digital scanning, dental photography, digital programs, used at collecting data for virtual planning, establishing a complex diagnosis and choosing the best surgical technique for this case, subsequently, with the transfer of the virtual plan in the operating room through surgical guides and occlusal splints. Postoperatively, there was an obvious improvement of the facial appearance, supported by the comparison of pre- and postoperative cephalometric indices: SNA (from 76,6° to 84°), SNB (from 80,6° to 78,8°), ANB (from -4° to 5,2°), Wits (from -9,6° to 0°). Early diagnosis and detailed planning by using modern methods of examination may ensure an efficient rehabilitation of patients suffering from dento-maxillary anomalies.

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Mohr, Thomas. "George Gavan Duffy and the legal consequences of the Anglo Irish Treaty, 1921–1923." Northern Ireland Legal Quarterly 73, AD2 (2022): 55–93. http://dx.doi.org/10.53386/nilq.v73iad2.964.

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George Gavan Duffy (1882–1951) was a signatory of the 1921 ‘Anglo Irish Treaty’. In the 1930s he enjoyed a notable judicial career and would rise to the position of President of the High Court of Ireland. This article examines a more neglected period of Gavan Duffy’s career. It focuses on his brief parliamentary career as a TD in the early 1920s and, in particular, his involvement in the creation of the Constitution of the Irish Free State. This analysis also examines the reasons for the divergence of Gavan Duffy’s position from that held by other signatories and supporters of the 1921 Treaty. By late 1922 Gavan Duffy had emerged as a determined critic of the Provisional Government and of the draft Constitution of the Irish Free State that emerged from negotiations in London. This analysis focuses on Gavan Duffy’s attempts to amend provisions of the draft Constitution that he believed went further than the strict legal demands of the 1921 Treaty. The conclusion assesses Gavan Duffy’s attitude towards the legal consequences of the 1921 Treaty and his attempts to mitigate their impact on the 1922 Constitution of the Irish Free State.

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Mohr, Thomas. "George Gavan Duffy and the legal consequences of the Anglo Irish Treaty, 1921–1923." Northern Ireland Legal Quarterly 74, no. 2 (2023): 323–61. http://dx.doi.org/10.53386/nilq.v74i2.1098.

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George Gavan Duffy (1882–1951) was a signatory of the 1921 ‘Anglo Irish Treaty’. In the 1930s he enjoyed a notable judicial career and would rise to the position of President of the High Court of Ireland. This article examines a more neglected period of Gavan Duffy’s career. It focuses on his brief parliamentary career as a TD in the early 1920s and, in particular, his involvement in the creation of the Constitution of the Irish Free State. This analysis also examines the reasons for the divergence of Gavan Duffy’s position from that held by other signatories and supporters of the 1921 Treaty. By late 1922 Gavan Duffy had emerged as a determined critic of the Provisional Government and of the draft Constitution of the Irish Free State that emerged from negotiations in London. This analysis focuses on Gavan Duffy’s attempts to amend provisions of the draft Constitution that he believed went further than the strict legal demands of the 1921 Treaty. The conclusion assesses Gavan Duffy’s attitude towards the legal consequences of the 1921 Treaty and his attempts to mitigate their impact on the 1922 Constitution of the Irish Free State.

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STEPHEN, JEFFREY. "National Fasting and the Politics of Prayer: Anglo-Scottish Union, 1707." Journal of Ecclesiastical History 60, no. 2 (2009): 294–316. http://dx.doi.org/10.1017/s0022046908006994.

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From the early Reformation the Scottish Kirk had seen national public fasting as an essential exercise in furthering the spiritual, political and material well-being of the nation. For that reason fasts were held frequently, particularly at times of national crisis in Church and State. In 1706, with parliament about to deliberate on a treaty for an incorporating union with England, a national fast seemed an obvious step. The refusal of the Court party to grant a civil sanction to a fast therefore placed the issue to the forefront of national debate, providing the opposition with a major opportunity to disrupt the progress of the treaty.

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Mani, Smitha, Sahjendra N. Singh, Surya Kiran Parimi, and Woosoon Yim. "Adaptive Servoregulation of a Projectile Fin Using Piezoelectric Actuator." Journal of Dynamic Systems, Measurement, and Control 129, no. 1 (2006): 100–104. http://dx.doi.org/10.1115/1.2397159.

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This brief paper treats the question of adaptive control of a projectile fin using a piezoelectric actuator. The hollow projectile fin is rigid, within which a flexible cantilever beam with a piezoelectric active layer is mounted. The model of the fin-beam system includes the aerodynamic moment, which is a function of angle of attack of the projectile. The rotation angle of the fin is controlled by deforming the flexible beam, which is hinged at the tip of the rigid fin. An adaptive servoregulator is designed for the control of the fin angle using the fin angle and its derivative for feedback. Interestingly, the knowledge of the dimension and parameters of the system is not essenstial for the synthesis of the control law. In the closed-loop system, the fin angle asymptotically converges to the desired set point and the elastic modes converge to their equilibrium values. Computer simulation and laboratory test results are presented to show the performance of the controller.

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Whitehead, J. C. "Rear Wheel Steering Dynamics Compared to Front Steering." Journal of Dynamic Systems, Measurement, and Control 112, no. 1 (1990): 88–93. http://dx.doi.org/10.1115/1.2894144.

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The lateral dynamics of rear wheel steering vehicles are examined using low order linear mathematical models. The response to rear steer angle inputs differs significantly from the front wheel steering response at low speeds. However, both the transient and steady state responses become less dependent on which wheels are steered as vehicle speed increases. This fact indicates that the unusual fixed control response does not alone cause rear wheel steering vehicles to be unsafe at high speeds. The free control instability unique to rear wheel steering vehicles is analyzed using a torque input model which treats steer angle as a degree of freedom. The cause of this unstable weave mode and the stable front wheel steering weave mode is a ratio of tire slip angle to steer angle in excess of unity during high speed cornering.

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KELLY, JAMES. "The Anglo-French Commercial Treaty of 1786: The Irish Dimension." Eighteenth-Century Ireland 4, no. 1 (1989): 93–111. http://dx.doi.org/10.3828/eci.1989.10.

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Efstathiou, Andreas, and Michael Rowan-Robinson. "Radiative transfer in axisymmetric dust clouds." Monthly Notices of the Royal Astronomical Society 245, no. 2 (1990): 275. http://dx.doi.org/10.1093/mnras/245.2.275.

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Summary In this paper we present a method of solution of the equation of radiative transfer for an axisymmetric distribution of dust around a central source. There is abundant observational evidence that points towards the existence of flattened density structures around a wide range of systems of astrophysical interest such as protostars, stars with circumstellar dust shells, reflection nebulae, active galactic nuclei and starburst galaxies. Results obtained with spherically symmetric models are clearly inappropriate in these cases and earlier attempts to solve the axisymmetric problem adopt simplifying assumptions that do not allow realistic modelling. The programme we have developed integrates the equation of radiative transfer exactly in the sense that it does not neglect any terms in the equation and treats multiple anisotropic scattering. The emergent spectral energy and intensity distributions are obtained for different viewing angles for models with different density distributions and optical depths. The method applies to an arbitrary density distribution, but in this paper we are presenting models of clouds in which the thickness of the disc increases linearly with distance from the central source and the disc is symmetric about the equatorial plane. The density is assumed to decline with radius as r−2 and with a power-law dependence on azimuthal angle Θ. We also present a model that gives an excellent fit to the spectrum of VY CMa, a late M supergiant which has long been thought to be surrounded by a circumstellar disc. The model predicts an unusual viewing angle, just inside the surface of the flared disc.

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Wang, H. H. S., and B. Roth. "Position Errors Due to Clearances in Journal Bearings." Journal of Mechanisms, Transmissions, and Automation in Design 111, no. 3 (1989): 315–20. http://dx.doi.org/10.1115/1.3259001.

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The positional errors due to clearances in journal bearings intended to approximate revolute joints are analyzed. Equations are presented which relate joint geometry, external loads, and errors. The paper treats the case common in serial chain manipulators where the revolute joint’s nominal rotational angle is controlled, and it is desired to determine the errors that result from the clearances.

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Ko¨nig, W. M., D. K. Hennecke, and L. Fottner. "Improved Blade Profile Loss and Deviation Angle Models for Advanced Transonic Compressor Bladings: Part I—A Model for Subsonic Flow." Journal of Turbomachinery 118, no. 1 (1996): 73–80. http://dx.doi.org/10.1115/1.2836609.

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New blading concepts as used in modern transonic axial-flow compressors require improved loss and deviation angle correlations. The new model presented in this paper incorporates several elements and treats blade-row flows having subsonic and supersonic inlet conditions separately. In the first part of this paper two proved and well-established profile loss correlations for subsonic flows are extended to quasi-two-dimensional conditions and to custom-tailored blade designs. Instead of a deviation angle correlation, a simple method based on singularities is utilized. The comparison between the new model and a recently published model demonstrates the improved accuracy in prediction of cascade performance achieved by the new model.

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Ward, Margaret. ":Women of the Dáil: Gender, Republicanism and the Anglo-Irish Treaty." American Historical Review 113, no. 1 (2008): 254–55. http://dx.doi.org/10.1086/ahr.113.1.254a.

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Shannon, Timothy J. "In the Bushes: The Secret History of Anglo-Iroquois Treaty Making." New York History 104, no. 1 (2023): 53–78. http://dx.doi.org/10.1353/nyh.2023.a902903.

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Bromley, Hugo. "Political Economy in the Baltic Borderlands: Commercial Interests and the Anglo‑Russian Treaty of Commerce, 1766." Studia Historica Gedanensia 13 (2022): 70–90. http://dx.doi.org/10.4467/23916001hg.22.005.17425.

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Commercial treaties between states played a crucial role in shaping overseas trade and the mercantile communities that lived among in the Baltic borderland. This article takes as its example the Anglo‑Russian treaty of commerce of 1766 between Britain and Russia to explore how Britain in particular negotiated commercial treaties. It shows the crucial role of commercial expertise, and particularly the British Russia Company, in shaping the treaty to best serve British interests. Britain’s reliance on commercial interests for expertise, meanwhile, was crucial to maintaining its supply of naval stores. The article then explores the impact of the treaty on mercantile networks in the Baltic, arguing that the fluidity of citizenship and national affiliation allowed the merchants of the former Hanseatic towns in particular to adapt and benefit from commercial treaties between states, a process that merits further research. The intersection of state and commercial interests was fundamental to commerce in the Baltic borderlands.

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Journal articles on the topic 'Angle of Treitz'

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