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Debye-hckel solution for steady electro-osmotic flow of micropolar fluid in cylindrical microcapillary

Applied Mathematics and Mechanics(English Edition) 2013年第11期34卷 1305-1326页

作者： A. A. SIDDIQUI A. lakhtakia Department of Basic Sciences Bahauddin Zakariya University Nanoengineered Metamaterials Group Department of Engineering Science and MechanicsPennsylvania State University University Park

Analytic expressions for speed, flux, microrotation, stress, and couple stress in a micropolar fluid exhibiting a steady, symmetric, and one-dimensional electro-osmotic flow in a uniform cylindrical microcapillary were derived under the constraint of the Debye-hiickel approximation, which is applicable when the cross-sectional radius of the microcapillary exceeds the Debye length, provided that the zeta potential is sufficiently small in magnitude. Since the aciculate particles in a micropolar fluid can rotate without translation, micropolarity affects the fluid speed, fluid flux, and one of the two non-zero components of the stress tensor. The axial speed in a micropolar fluid intensifies when the radius increases. The stress tensor is confined to the region near the wall of the mi- crocapillary, while the couple stress tensor is uniform across the cross-section.

关键词： couple stress electro-osmosis microcapillary micropolar fluid microrota-tion steady flow

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Endoscopic ultrasound guided radiofrequency ablation,for pancreatic cystic neoplasms and neuroendocrine tumors

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World Journal of Gastrointestinal Surgery 2015年第4期7卷 52-59页

作者： Madhava Pai Nagy habib hakan Senturk Sundeep lakhtakia Nageshwar Reddy Vito R Cicinnati Iyad Kaba Susanne Beckebaum Panagiotis Drymousis Michel Kahaleh William Brugge hPB Unit Hammersmith HospitalImperial College Emcision Limited Department of Gastroenterology Bezmi Alem University Asian Institute of Gastroenterology Department of Transplant Medicine University Hospital Münster Division of Gastroenterology and hepatology Department of MedicineWeill Cornell Medical College Massachusetts General hospital Harvard Medical School

AIM: To outline the feasibility, safety, adverse events and early results of endoscopic ultrasound(EUS)-radiofrequency ablation(RFA) in pancreatic neoplasms using a novel probe. METhODS: This is a multi-center, pilot safety feasibility study. The intervention described was radiofrequency ablation(RF) which was applied with an innovative monopolar RF probe(1.2 mm habib EUS-RFA catheter) placed through a 19 or 22 gauge fine needle aspiration(FNA) needle once FNA was performed in patients with a tumor in the head of the pancreas. The habibTM EUSRFA is a 1 Fr wire(0.33 mm, 0.013") with a working length of 190 cm, which can be inserted through the biopsy channel of an echoendoscope. RF power is applied to the electrode at the end of the wire to coagulate tissue in the liver and ***: Eight patients [median age of 65(range 27-82) years; 7 female and 1 male] were recruited in a prospective multicenter trial. Six had a pancreatic cysticneoplasm(four a mucinous cyst, one had intraductal papillary mucinous neoplasm and one a microcystic adenoma) and two had a neuroendocrine tumors(NET) in the head of pancreas. The mean size of the cystic neoplasm and NET were 36.5 mm(SD ± 17.9 mm) and 27.5 mm(SD ± 17.7 mm) respectively. The EUSRFA was successfully completed in all cases. Among the 6 patients with a cystic neoplasm, post procedure imaging in 3-6 mo showed complete resolution of the cysts in 2 cases, whilst in three more there was a 48.4% reduction [mean pre RF 38.8 mm(SD ± 21.7 mm) vs mean post RF 20 mm(SD ± 17.1 mm)] in size. In regards to the NET patients, there was a change in vascularity and central necrosis after EUS-RFA. No major complications were observed within 48 h of the procedure. Two patients had mild abdominal pain that resolved within 3 d. CONCLUSION: EUS-RFA of pancreatic neoplasms with a novel monopolar RF probe was well tolerated in all cases. Our preliminary data suggest that the procedure is straightforward and safe. The response ranged from com

关键词： Endoscopic ultrasound Radiofrequencyablation Pancreas Cystic neoplasms Neuroendocrinetumors

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