Sample records for lumboperitoneal lp shunt

  1. Spinal Intradural Hematoma and Permanent Paraparesis after a Lumboperitoneal Shunt Operation: An Unusual Complication

    PubMed Central

    Efendioglu, Mustafa; Bolukbasi, Fatih Han; Aslan, Sahin; Isik, Nejat; Kaner, Tuncay

    2014-01-01

    Pseudotumor cerebri is a condition of increased intracranial pressure in the absence of clinical, laboratory or radiological pathology. Spinal intradural hematoma formation after lumboperitoneal shunt (LPS) implantation is very rare, but it can cause sudden and serious deterioration. In this report, we present a patient who developed an intradural hematoma following LPS operation. A 27-year-old male patient suffering from headaches and progressive vision loss was diagnosed with pseudotumor cerebri. He underwent LPS operation in January 2009. Four hours after the operation, he developed urinary and fecal incontinence with paraparesis (1/5). Lumbar magnetic resonance imaging identified an intradural hematoma at the level of L2-L3, and he was reoperated. The intradural hematoma was removed. Physical therapy was started because of paraparesis. Two months later, the patient's muscle strength had increased to 3/5. Surgeons must remember that, LPS implantation can cause a spinal intradural hematoma in a small percentage of patients, with catastrophic results. PMID:25187872

  2. Frameless Stereotactic Ventricular Shunt Placement for Idiopathic Intracranial Hypertension

    Microsoft Academic Search

    Graeme F. Woodworth; Matthew J. McGirt; Peter Elfert; Daniel M. Sciubba; Daniele Rigamonti

    2005-01-01

    Introduction: Cerebrospinal fluid (CSF) shunting effectively reverses symptoms of idiopathic intracranial hypertension (IIH). Lumboperitoneal (LP) shunts have traditionally been used in patients with IIH due to a frequently undersized ventricular system. However, the advent of image-guided stereotaxis has enabled effective ventricular catheter placement in patients with IIH. We describe the first large series of frameless stereotactic ventriculoperitoneal (VP) shunting for

  3. [Shunt passer clamp: a new device to prevent rotation of CSF-shunt passer].

    PubMed

    Mashiko, Toshihiro; Anno, Takayuki; Arai, Fumihiro; Watanabe, Eiju

    2015-04-01

    Cerebrospinal fluid shunting is a surgical treatment alternative for hydrocephalus. In general, ventriculoperitoneal (VP) and lumboperitoneal (LP) shunts have been widely practiced as standard procedures. However, these procedures are difficult because the shunt passer often rotates unintentionally. Therefore, we developed a simple device that prevents shunt passer rotation and termed it a "shunt passer-clamp"(SP-C). This device consists of two parts: the first part is the body with a hole through which the passer goes and a "female" screw perpendicular to the hole. The second part is a "male" screw set to the body. The surgeon can attach the SP-C to the shunt passer without the requirement for remodeling. We employed a SP-C for 14 consecutive shunt surgeries and received favorable feedback from the surgeons. Handling was considered "easy" in all cases. The surgical duration was significantly shorter than that if the SP-C was not employed. We conclude that our specially designed SP-C is relatively effective. PMID:25838302

  4. Laboratory Testing of Hydrocephalus Shunts – Conclusion of the U.K. Shunt Evaluation Programme

    Microsoft Academic Search

    Z. Czosnyka; M. Czosnyka; H. K. Richards; J. D. Pickard

    2002-01-01

    Summary.  \\u000a ?16 models of valves, currently in use in the U.K., have been tested long-term in the U.K. Shunt Evaluation Laboratory according\\u000a to the protocol based on the new ISO 7197 standard. Valves tested were:\\u000a \\u000a \\u000a \\u000a ?Medtronic PS Medical: Delta Valve, Flow Control and Lumbo-Peritoneal Shunt\\u000a \\u000a \\u000a \\u000a ?Heyer-Schulte Nero-Care: In-line, Low Profile and Pudenz Flushing Valve\\u000a \\u000a \\u000a \\u000a ?Codman: Codman-Hakim Programmable, Hakim Precision, Accu-Flo,

  5. Distal splenorenal shunt

    MedlinePLUS

    ... splenic venous shunt; Warren shunt; Cirrhosis - distal splenorenal; Liver failure - distal splenorenal ... the intestine, spleen, pancreas, and gallbladder to the liver. When blood flow is blocked, the pressure in ...

  6. Shunt Dependency in Shunted Arachnoid Cyst: A Reason to Avoid Shunting

    Microsoft Academic Search

    Seung-Ki Kim; Byung-Kyu Cho; You-Nam Chung; Hee-Soo Kim; Kyu-Chang Wang

    2002-01-01

    Cystoperitoneal (CP) shunting is minimally invasive and achieves a high rate of resolution on neuroimaging. However, in the absence of definite symptoms, shunting should be reconsidered, because some patients can experience shunt dependency after CP shunting. In this study, the risk of shunt dependency in patients with arachnoid cysts treated with CP shunting and the management of these patients are

  7. Impact of Cerebrospinal Fluid Shunting for Idiopathic Normal Pressure Hydrocephalus on the Amyloid Cascade

    PubMed Central

    Moriya, Masao; Miyajima, Masakazu; Nakajima, Madoka; Ogino, Ikuko; Arai, Hajime

    2015-01-01

    The aim of this study was to determine whether the improvement of cerebrospinal fluid (CSF) flow dynamics by CSF shunting, can suppress the oligomerization of amyloid ?-peptide (A?), by measuring the levels of Alzheimer’s disease (AD)-related proteins in the CSF before and after lumboperitoneal shunting. Lumbar CSF from 32 patients with idiopathic normal pressure hydrocephalus (iNPH) (samples were obtained before and 1 year after shunting), 15 patients with AD, and 12 normal controls was analyzed for AD-related proteins and APLP1-derived A?-like peptides (APL1?) (a surrogate marker for A?). We found that before shunting, individuals with iNPH had significantly lower levels of soluble amyloid precursor proteins (sAPP) and A?38 compared to patients with AD and normal controls. We divided the patients with iNPH into patients with favorable (improvement ? 1 on the modified Rankin Scale) and unfavorable (no improvement on the modified Rankin Scale) outcomes. Compared to the unfavorable outcome group, the favorable outcome group showed significant increases in A?38, 40, 42, and phosphorylated-tau levels after shunting. In contrast, there were no significant changes in the levels of APL1?25, 27, and 28 after shunting. After shunting, we observed positive correlations between sAPP? and sAPP?, A?38 and 42, and APL1?25 and 28, with shifts from sAPP? to sAPP?, from APL1?28 to 25, and from A?42 to 38 in all patients with iNPH. Our results suggest that A? production remained unchanged by the shunt procedure because the levels of sAPP and APL1? were unchanged. Moreover, the shift of A? from oligomer to monomer due to the shift of A?42 (easy to aggregate) to A?38 (difficult to aggregate), and the improvement of interstitial-fluid flow, could lead to increased A? levels in the CSF. Our findings suggest that the shunting procedure can delay intracerebral deposition of A? in patients with iNPH. PMID:25821958

  8. Impact of cerebrospinal fluid shunting for idiopathic normal pressure hydrocephalus on the amyloid cascade.

    PubMed

    Moriya, Masao; Miyajima, Masakazu; Nakajima, Madoka; Ogino, Ikuko; Arai, Hajime

    2015-01-01

    The aim of this study was to determine whether the improvement of cerebrospinal fluid (CSF) flow dynamics by CSF shunting, can suppress the oligomerization of amyloid ?-peptide (A?), by measuring the levels of Alzheimer's disease (AD)-related proteins in the CSF before and after lumboperitoneal shunting. Lumbar CSF from 32 patients with idiopathic normal pressure hydrocephalus (iNPH) (samples were obtained before and 1 year after shunting), 15 patients with AD, and 12 normal controls was analyzed for AD-related proteins and APLP1-derived A?-like peptides (APL1?) (a surrogate marker for A?). We found that before shunting, individuals with iNPH had significantly lower levels of soluble amyloid precursor proteins (sAPP) and A?38 compared to patients with AD and normal controls. We divided the patients with iNPH into patients with favorable (improvement ? 1 on the modified Rankin Scale) and unfavorable (no improvement on the modified Rankin Scale) outcomes. Compared to the unfavorable outcome group, the favorable outcome group showed significant increases in A?38, 40, 42, and phosphorylated-tau levels after shunting. In contrast, there were no significant changes in the levels of APL1?25, 27, and 28 after shunting. After shunting, we observed positive correlations between sAPP? and sAPP?, A?38 and 42, and APL1?25 and 28, with shifts from sAPP? to sAPP?, from APL1?28 to 25, and from A?42 to 38 in all patients with iNPH. Our results suggest that A? production remained unchanged by the shunt procedure because the levels of sAPP and APL1? were unchanged. Moreover, the shift of A? from oligomer to monomer due to the shift of A?42 (easy to aggregate) to A?38 (difficult to aggregate), and the improvement of interstitial-fluid flow, could lead to increased A? levels in the CSF. Our findings suggest that the shunting procedure can delay intracerebral deposition of A? in patients with iNPH. PMID:25821958

  9. residue and shunting pinholes

    NASA Astrophysics Data System (ADS)

    Gorji, Nima E.

    2014-09-01

    The present work considers two observable phenomena through the experimental fabrication and electrical characterization of the rf-sputtered CdS/CdTe thin film solar cells that extremely reduce the overall conversion efficiency of the device: CdCl2 residue on the surface of the semiconductor and shunting pinholes. The former happens through nonuniform treatment of the As-deposited solar cells before annealing at high temperature and the latter occurs by shunting pinholes when the cell surface is shunted by defects, wire-like pathways or scratches on the metallic back contact caused from the external contacts. Such physical problems may be quite common in the experimental activities and reduce the performance down to 4-5 % which leads to dismantle the device despite its precise fabrication. We present our electrical characterization on the samples that received wet CdCl2 surface treatment (uniform or nonuniform) and are damaged by the pinholes.

  10. Mevalonate shunt pathway revisited

    SciTech Connect

    Watson, J.A.; Gonzalez-Pacanowska, D.; Havel, C.M.

    1987-05-01

    Full suppression of mammalian HMG-CoA reductase (HMGR) activity requires regulatory sterol and non-sterol products derived from mevalonate (MVA). The regulatory products identities are unknown. They have taken advantage of an established insect cell line (K/sub c/ cells) to identify the non-sterol isoprenoid regulatory signal (NSRS) molecule(s). Since K/sub c/ cells shunt minimally 40% of their MVA carbon, to non isoprenoid products, it is possible that the NSRS molecule(s) are also generated by this pathway. They report on investigations to elucidate the MVA shunt pathway. Intact K/sub c/ cells accumulate farnesol and geranylgeraniol with increasing exogenous MVA concentration. Supplemented K/sub c/ cells extracts rapidly convert (/sup 14/C) farnesol to ..cap alpha..,omega-dibasic prenoic acids (DCA) plus further degradation products. Two of the DCA products are 3,7-dimethyl 2,6-decadien 1,10-dioic acid and 3,7,11-trimethyl 2,6,10-dodecatrien 1,12-dioic acid. Similar acids are isolated from identical incubations with rat liver homogenates. Their results support MVA carbon being converted to non-isoprenoid products via polyprenols which in turn, are oxidatively catabolized, as DCAs, from the w-terminus. This metabolic capacity, exists in both mammalian and invertebrate cells and offers an alternative to shunt pathways proposed by other investigators.

  11. Coagulopathy post peritoneovenous shunt.

    PubMed Central

    LeVeen, H H; Ip, M; Ahmed, N; Hutto, R B; LeVeen, E G

    1987-01-01

    In 1942, 53% of medically treated patients with cirrhosis were dead 6 months after the onset of ascites. Only 30% survived 1 year. This dismal outlook has improved only slightly with advances in medicine. Yet, some internists reject the peritoneovenous shunt (PVS) for this fatal condition even if they are aware that a diminished blood volume causes the abnormal sodium retention responsible for ascites. Their objections are based on life-threatening complications of PVS, especially post shunt coagulopathy (PSC). Blood shed into the peritoneal cavity becomes incoagulable. Such blood is immediately coagulated by a protocoagulant (soluble collagen) and concurrently lysed by tissue plasminogen activator (TPA) secreted by the peritoneal serosa. Wide zones of lysis surround peritoneal tissue placed on fibrin plates. Large volumes of ascitic fluid infused into circulating blood simulates the fate of blood shed into the peritoneal cavity with lysis playing the major role. Addition of ascitic fluid to normal platelet-rich plasma in vitro initiates clot lysis on thromboelastogram (TEG). Epsilon-aminocaproic acid (EACA) counteracts this lysis. EACA and clotting factors normalize the TEG and arrest PSC. Disposal of ascitic fluid at surgery prevents or ameliorates PSC. Mild PSC was encountered only twice in 150+ consecutive patients (1.3%) with only one case being clinically significant (0.6%). Severe PSC occurred seven times in 98 early shunt patients whose ascitic fluid was not discarded. Severe PSC requires shunt interruption and control of bleeding with clotting factors and EACA. Peritoneal lavage with saline prevents the recurrence of PSC on reopening the shunt. In four patients, EACA and clotting factors were adequate to arrest coagulopathy. Three earlier patients died of PSC before its cause and treatment were understood. Proper management eliminates this life-threatening complication, and PSC cannot be considered a deterrent to PVS. Disseminated intravascular coagulopathy (DIC) is produced in experimental animals only by the injection of thrombin or thromboplastin. PSC is a distinct entity differing from DIC; EACA and not heparin is the antidote for PSC. Images Fig. 1. Fig. 2. Fig. 4. Fig. 5. Fig. 6. PMID:3103556

  12. Over-shunting associated myelopathy.

    PubMed

    Howard, Brian M; Sribnick, Eric A; Dhall, Sanjay S

    2014-12-01

    Intracranial hypotension typically presents following cerebrospinal fluid (CSF) leak, but can be induced by CSF diversion. Classically, patients present with positional headache, but less common symptoms include neck pain and cranial nerve palsies. To our knowledge, the neurosurgical literature contains six reports of patients with symptomatic cervical, epidural venous plexus engorgement as the result of CSF shunting. The patient presented herein is a 26-year-old woman with shunt-dependent, congenital hydrocephalus. She presented with rapidly progressive cervical myelopathy following ventriculoperitoneal shunt revision. Imaging revealed engorgement of the cervical epidural venous plexus and mass effect on the cervical spinal cord. "Over-shunting associated myelopathy" is a rare complication of CSF diversion that should be familiar to physicians who routinely evaluate patients with intracranial shunts. PMID:25070631

  13. LP Field, 2010

    USGS Multimedia Gallery

    Rivers in middle Tennessee crested May 2-3,2010, breaking records at many USGS-operated streamgages. The flood peak on the Cumberland River in downtown Nashville ranks as the highest observed during the past 73 years. Flooding on the Cumberland River damaged the Grand Ole Opry House, LP Field (shown...

  14. POWER HARVESTING PIEZOELECTRIC SHUNT DAMPING 1

    E-print Network

    Fleming, Andrew J.

    POWER HARVESTING PIEZOELECTRIC SHUNT DAMPING 1 A. J. Fleming ¤ S. O. R. Moheimani ¤ ¤ School piezoelectric transducer. Typical shunt networks require inductance values of up to thousands of Henries introduces an e±cient, light weight, and small-in-size technique for implementing piezoelectric shunt damping

  15. Registration of LP1-2581, LP1-2163H, LP3-1159, and LP640-1304 low phytate spring barley germplasm lines

    Technology Transfer Automated Retrieval System (TEKTRAN)

    The Agricultural Research Service, U.S. Dept. of Agriculture (USDA-ARS) has developed and released four low-phytate spring barley (Hordeum vulgare L.) germplasm lines: LP1-2581 (Reg. No._____, PI 658245), LP1-2163H (Reg. No._____, PI 658248 ), LP3-1159 (Reg. No._____, PI 658247), and LP640-1304 (...

  16. Ventriculoperitoneal shunt perforations of the gastrointestinal tract.

    PubMed

    Thiong'o, Grace Muthoni; Luzzio, Christopher; Albright, A Leland

    2015-07-01

    OBJECT The purposes of this study were to evaluate the frequency with which children presented with ventriculoperitoneal (VP) shunt perforations of the gastrointestinal (GI) tract, to determine the type of shunts that caused the perforations, and to compare the stiffness of perforating catheters with the stiffness of catheters from other manufacturers. METHODS Medical records were reviewed of 197 children who were admitted with VP shunt malfunction. Catheter stiffness was evaluated by measuring relative resistance to cross-sectional compression, resistance to column buckling, and elasticity in longitudinal bending. Catheter frictional force was measured per unit length. RESULTS Six children were identified whose VP shunts had perforated the GI tract; 2 shunts subsequently protruded through the anal orifice, 1 protruded through the oral cavity, and 3 presented with subcutaneous abscesses that tracked upward from the intestine to the chest. All perforating shunts were Chhabra shunts. Catheter stiffness and resistance to bending were greatest with a Medtronic shunt catheter, intermediate with a Codman catheter, and least with a Chhabra catheter. Frictional force was greatest with a Chhabra catheter and least with a Medtronic catheter. CONCLUSIONS The frequency of perforations by Chhabra shunts appears to be higher than the frequency associated with other shunts. The increased frequency does not correlate with their stiffness but may reflect their greater frictional forces. PMID:25837887

  17. Subdivision Schemes in Lp Spaces

    Microsoft Academic Search

    Rong-Qing Jia

    1995-01-01

    Subdivision schemes play an important role in computer graphics and wavelet analysis. In this paper we are mainly concerned with convergence of subdivision schemes inLp spaces (1 p 1 ). We characterize the Lp-convergence of a subdivision scheme in terms of the p-norm joint spectral radius of two matrices associated with the corresponding mask. We also discuss various properties of

  18. Arteriovenous shunts involving the liver.

    PubMed

    Adler, J; Goodgold, M; Mitty, H; Gordon, D; Kinkhabwala, M

    1978-11-01

    Arteriovenous shunting in the liver is a rare angiographic finding. Review of the literature shows that most cases are related to trauma or neoplasm. The authors discuss several entities which should also be included in the differential diagnosis, among them congenital arteriovenous malformations or hemangiomas of the liver and pancreas, cirrhosis with rearterialization of the liver, hepatic abscess, hypervascular liver metastases, and primary tumors with invasion of the portal and hepatic veins by arterial neovasculature. PMID:704843

  19. WEIGHTED Lp -BOUNDEDNESS OF FOURIER SERIES

    E-print Network

    Pérez, Mario

    Jacobi weight on the interval [-1, 1] and, for each function f, let Snf denote the n-th partial sum with respect to dµ. The study of the boundedness Snf Lp(updµ) C f Lp(vpdµ), (1) where u(x) = (1 - x)a (1 + x, . . . , N) (3) and A a, B b, Gi gi (4) hold, then C > 0 such that Snf Lp(updµ) C f Lp(vpdµ) f Lp (vp dµ

  20. Arterioportal shunts on dynamic computed tomography

    SciTech Connect

    Nakayama, T.; Hiyama, Y.; Ohnishi, K.; Tsuchiya, S.; Kohno, K.; Nakajima, Y.; Okuda, K.

    1983-05-01

    Thirty-two patients, 20 with hepatocelluar carcinoma and 12 with liver cirrhosis, were examined by dynamic computed tomography (CT) using intravenous bolus injection of contrast medium and by celiac angiography. Dynamic CT disclosed arterioportal shunting in four cases of hepatocellular carcinoma and in one of cirrhosis. In three of the former, the arterioportal shunt was adjacent to a mass lesion on CT, suggesting tumor invasion into the portal branch. In one with hepatocellular carcinoma, the shunt was remote from the mass. In the case with cirrhosis, there was no mass. In these last two cases, the shunt might have been caused by prior percutaneous needle puncture. In another case of hepatocellular carcinoma, celiac angiography but not CT demonstrated an arterioportal shunt. Thus, dynamic CT was diagnostic in five of six cases of arteriographically demonstrated arterioportal shunts.

  1. Safety of Laparoscopy in Ventriculoperitoneal Shunt Patients

    PubMed Central

    Sankpal, Rajendra; Chandavarkar, Abhishek; Chandavarkar, Madhura

    2011-01-01

    There has been an increasing trend in Laparoscopic surgeries. There is also a higher incidence of patients with ventriculoperitoneal (VP) shunts due to the advances in the techniques of cerebral shunts. Surgeons may come across patients of VP shunts presenting with an indication for laparoscopic surgery. Although there is no absolute contraindication for laparoscopy in VP shunts, there is always a risk of raised intracranial pressure. We describe a case of VP shunt presenting with an ectopic pregnancy and undergoing laparoscopic salpingectomy. Patient withstood the procedure well and had an uneventful recovery. Reviewing the literature, we found that laparoscopy is safe in VP shunts. However, there should always be accompanied by good monitoring facilities.

  2. Magnetoresistance of Metal-Shunted Graphene Devices

    Microsoft Academic Search

    Paul Campbell; Adam Friedman; F. Keith Perkins; Jeremy Robinson

    2011-01-01

    Graphene, a single atomic layer of hexagonally arranged carbon atoms, presents the optimal platform to study magnetoresistance (MR) effects because of its temperature-independent mobility and linear band structure with zero band gap. Extraordinary magnetoresistance (EMR) can be realized in metal-shunted graphene devices. Here, due to the different magnetic-field-dependent resistances of the metallic shunt, graphene, and shunt-graphene interface, current flows easily

  3. Shunt types in multicrystalline solar cells

    Microsoft Academic Search

    O. Breitenstein; J. P. Rakotoniaina; S. Neve; M. H. Al Rifai; M. Werner

    2003-01-01

    Nine different types of shunts have been found in state of the art multicrystalline solar cells by lock-in thermography and identified by SEM-investigation (incl. EBIC), TEM and EDX. These shunts differ by the type of their I-V characteristic (linear or non-linear) and by their physical origin. Six shunt types are process-induced, and three are caused by grown-in defects of the

  4. Radiological Insertion and Management of Peritoneovenous Shunt

    SciTech Connect

    Bratby, M. J. [St George's Hospital, Radiology Department (United Kingdom); Hussain, F. F., E-mail: fhussain@doctors.org.uk; Lopez, A. J. [Royal Surrey County Hospital and St. Luke's Cancer Centre, Radiology Department (United Kingdom)

    2007-06-15

    The purpose of the study was to report our experience of the management of complications following the insertion of a peritoneovenous shunt for intractable malignant ascites. From June 1999 to January 2006, 26 patients underwent insertion of a peritoneovenous shunt for ascites by interventional radiologists. We have used ultrasound and shuntography to assist in the diagnosis of the cause of shunt blockage. Successful techniques for the restoration of the shunt function include port- pumping, stripping of any fibrin sheath, and revision of either the venous or peritoneal catheter. The procedure was initially successful in all patients with continued patency until death in 17. A further four patients are still alive with a functioning shunt. There was one rapid postprocedure death resulting from pulmonary edema. Two patients developed pneumothorax, managed successfully with either a chest drain or aspiration. Shunt dysfunction occurred eight times in seven patients. There were five successful revisions in four patients. Overall, shunt patency has been maintained in 80.1% of patients. Shunt dysfunction is seen in a significant number of patients, but successful revision of the shunt can be achieved in the majority.

  5. Scintisplenoportography in assessing patency of distal splenorenal shunts

    SciTech Connect

    Teres, J.; Herranz, R.; Visa, J.; Lomena, F.; Pera, C.; Rodes, J.

    1983-06-01

    Scintisplenoportography was performed on 33 occasions in 28 cirrhotic patients who had bled from esophagogastric varices. In 17 cases scintisplenoportography was carried out after a retroperitoneal distal splenorenal shunt procedure and in the remaining 16 instances in patients without any surgical shunt. In four patients scintisplenoportography was performed before and after a surgical shunt procedure, and in one case, before and after the shunt thrombosed. Gammagraphic patterns and spleen-heart times helped determine which patients did not have a surgical shunt, which had a patent shunt, and which patients had a thrombosed shunt. A patent shunt pattern and a thrombosed shunt pattern have been defined. It is concluded that scintisplenoportography is a useful, reproducible, and safe method to assess the patency of distal splenorenal shunts.

  6. Magnetoresistance of Metal-Shunted Graphene Devices

    NASA Astrophysics Data System (ADS)

    Campbell, Paul; Friedman, Adam; Perkins, F. Keith; Robinson, Jeremy

    2011-03-01

    Graphene, a single atomic layer of hexagonally arranged carbon atoms, presents the optimal platform to study magnetoresistance (MR) effects because of its temperature-independent mobility and linear band structure with zero band gap. Extraordinary magnetoresistance (EMR) can be realized in metal-shunted graphene devices. Here, due to the different magnetic-field-dependent resistances of the metallic shunt, graphene, and shunt-graphene interface, current flows easily through the shunt in zero and low magnetic field, while in high magnetic field, more current flows around the shunt and is redistributed in the graphene. Devices made from chemical vapor deposition (CVD) graphene grown on copper and transferred to a Si O2 /Si substrate with Ti/Au shunts display gate-tunable longitudinal MR of ~ 600 % at 12 T and also show promise for use as Hall sensors. Graphene magnetoresistance devices have many possible applications including magnetic field sensors and magnetic read-heads. In contrast with the many proposed electronic uses for graphene, which necessitate the creation of a band-gap, graphene magnetoresistance devices that exploit LMR or EMR provide a use for as-grown or deposited graphene.

  7. A description of (Cp[Lp(M)], Rp[Lp(M)])?

    Microsoft Academic Search

    Quanhua Xu

    2005-01-01

    We give a simple explicit description of the norm in the complex interpolation space (Cp(Lp(M)), Rp(Lp(M)))? for any von Neumann algebra M and any 1 ? p ? 1. Let M be a semifinite von Neumann algebra equipped with a normal semifinite faithful trace ?. Let Lp(M) be the associated noncommutative Lp-space. Given an integer n let Cn(M) (resp. Rn(M))

  8. Radionuclide demonstration of intrapulmonary shunting in cirrhosis

    SciTech Connect

    Bank, E.R.; Thrall, J.H.; Dantzker, D.R.

    1983-05-01

    The association of hepatic cirrhosis and severe arterial hypoxemia has been well described. Although alterations in ventilatory function may partially account for the hypoxemia, the principal mechanism is thought to be a microangiopathic change in the pulmonary vasculature resulting in intrapulmonary arteriovenous shunting with resultant systemic desaturation. Whole-body radionuclide scans with technetium-99m macroaggregated albumin labeling have been diagnostic of right-to-left shunting by their demonstration of tracer accumulation within the extrapulmonary circulation. A case of severe pulmonary arteriovenous shunting in an alcoholic patient in whom hepatic disease had not been of apparent clinical significance before radionuclide scanning is reported. He did not have cuntaeous angiomata as have all other patients with alcoholic cirrhosis and hypoxemia.

  9. Radionuclide demonstration of intrapulmonary shunting in cirrhosis

    SciTech Connect

    Bank, E.R.; Thrall, J.H.; Dantzker, D.R.

    1983-05-01

    The association of hepatic cirrhosis and severe arterial hypoxemia has been well described. Although alterations in ventilatory function may partially account for the hypoxemia, the principal mechanism is thought to be a microangiopathic change in the pulmonary arteriovenous shunting with resultant systemic desaturation. Whole-body radionuclide scans with technetium-99m macroaggrregated albumin (/sup 99m/Tc MAA) labeling have been diagnostic of right-to-left shunting by their demonstration of tracer accumulation within the extrapulmonary circulation. A case of severe pulmonary arteriovenous shunting in an alcoholic patient in whom hepatic disease had not been of apparent clinical significance before radionuclide scanning is reported. He did not have cutaneous angiomata as have all other patients with alcoholic cirrhosis and hypoxemia.

  10. Laparoscopically assisted ventriculoperitoneal shunt placement using 2-mm instrumentationrid=\\

    Microsoft Academic Search

    P. R. Reardon; T. K. Scarborough; B. D. Matthews; J. L. Marti; A. Preciado

    2000-01-01

    Background: Laparoscopy has potential benefit in the placement of ventriculoperitoneal shunts. In patients who have undergone multiple\\u000a shunt revisions or other abdominal operations, laparoscopy may be particularly beneficial when finding of a suitable area\\u000a in which to place the shunt is a concern. The purpose of this study was to evaluate the safety and effectiveness of laparoscopically\\u000a assisted ventriculoperitoneal shunt

  11. Postoperative Assessment of Splenorenal Shunts with MRI: Preliminary Investigation

    Microsoft Academic Search

    Jesse M. Cohen; Jeffrey C. Weinreb; Helen C. Redman

    Magneticresonanceimaging (MRI) was performed on nine patients with hepatic cirrhosis and portal hypertension after selective distal splenorenal shunt for decompres- sion of bleeding esophageal varices. MRI demonstrated the splenorenal anastomosis and patency of the shunt, splenic vein, and left renal vein in each case. Imaging in the transverse plane provided optimal visualization of the shunts. The authors conclude that MRI

  12. VAGAL REGULATION OF INTRACARDIAC SHUNTING IN THE TURTLE PSEUDEMYS SCRIPTA

    Microsoft Academic Search

    JAMES W. HICKS

    1994-01-01

    Summary Two principal hypotheses account for intracardiac shunting in reptiles. The 'pressure shunting' hypothesis proposes that there is no fuctional separation between the ventricular cava during systole. The 'washout shunting' hypothesis suggests that the cavum pulmonale is functionally separated from the rest of the ventricle during systole. The purpose of this study was to test the two principal hypotheses in

  13. Fabrication of capacitively-shunted superconducting qubits

    NASA Astrophysics Data System (ADS)

    Yoder, Jonilyn L.; Gudmundsen, Theodore J.; Bolkhovsky, Vladimir; Welander, Paul B.; Gustavsson, Simon; Hover, David; Kerman, Andrew J.; Sears, Adam P.; Oliver, William D.

    2014-03-01

    Improvements in superconducting qubit coherence times and reproducibility have been demonstrated using capacitive shunting. In this study, we present methods for the preparation of both capacitively-shunted charge qubits (transmons) and capacitively-shunted flux qubits. Hybrid fabrication techniques were employed to combine high-quality-factor aluminum capacitive shunts with shadow-evaporated Josephson junctions, and the Josephson junctions were prepared using suspended-bridge germanium masks. We also will describe process testing results that were acquired to assess wafer-to-wafer reproducibility of our fabrication protocols. This research was funded in part by the Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA); and by the Assistant Secretary of Defense for Research and Engineering under Air Force Contract number FA8721-05-C-0002. All statements of fact, opinion or conclusions contained herein are those of the authors and should not be construed as representing the official views or policies of IARPA, the ODNI, or the U.S. Government.

  14. Optimal shunt compensators at nonsinusoidal busbars

    Microsoft Academic Search

    I. M. El-Amin; S. O. Duffuaa; A. U. Bawah

    1995-01-01

    A model for determining an optimal shunt capacitor value at nonsinusoidal busbars combining three basic criteria maximizing the power factor, minimizing the line losses, and maximizing the transmission efficiency is developed. The choice of the capacitor value is constrained by the values that may cause resonance. This model was solved employing the penalty function approach and the golden Section Search

  15. Ventriculoperitoneal shunt infection caused by Bifidobacterium breve.

    PubMed

    Suwantarat, Nuntra; Romagnoli, Mark; Wakefield, Teresa; Carroll, Karen C

    2014-08-01

    Bifidobacterium breve is a rare cause of human infections. Previously, bacteremia and meningitis caused by this organism linked to probiotic use have been reported in a neonate. We report the first case of a ventriculoperitoneal shunt infection caused by B. breve in an adult without a history of probiotic use. PMID:24755114

  16. Atlantoaxial rotatory fixation after ventriculoperitoneal shunting.

    PubMed

    Heary, R F; Reid, P; Carmel, P W

    2011-10-01

    Ventriculoperitoneal (VP) shunting is a common neurosurgical procedure in the pediatric population. Atlantoaxial rotatory fixation (AARF) is not uncommon in this same group. We present the first reported case of AARF following a VP shunt procedure. A 10-year-old boy, with hydrocephalus and a left temporal arachnoid cyst since birth, underwent a revision of his VP and cystoperitoneal shunts. A second operation was performed 2 days later to optimize catheter placement. Postoperative neck pain was attributed to tunneling of the subcutaneous catheter. 2 months after surgery, the child had minimal neck discomfort but maintained his head in a "cock-robin" position. Plain radiographs and computed tomographic (CT) images confirmed AARF. The child was admitted and placed in halo traction. After 3 days of traction, analgesics, sedation, and muscle relaxants, anatomic re-alignment of the C1-C2 vertebral complex was confirmed on CT scan. Following 3 months of immobilization in a halo-vest apparatus, the halo was removed. At 8-year follow-up, the clinical examination is normal and repeat imaging studies remain normal. Due to surgical positioning, and postoperative signs attributed to normal postoperative pain, an AARF was not initially recognized. This case represents the first time that AARF has been reported following a VP shunt procedure. PMID:21959746

  17. Passively Shunted Piezoelectric Damping of Centrifugally-Loaded Plates

    NASA Technical Reports Server (NTRS)

    Duffy, Kirsten P.; Provenza, Andrew J.; Trudell, Jeffrey J.; Min, James B.

    2009-01-01

    Researchers at NASA Glenn Research Center have been investigating shunted piezoelectric circuits as potential damping treatments for turbomachinery rotor blades. This effort seeks to determine the effects of centrifugal loading on passively-shunted piezoelectric - damped plates. Passive shunt circuit parameters are optimized for the plate's third bending mode. Tests are performed both non-spinning and in the Dynamic Spin Facility to verify the analysis, and to determine the effectiveness of the damping under centrifugal loading. Results show that a resistive shunt circuit will reduce resonant vibration for this configuration. However, a tuned shunt circuit will be required to achieve the desired damping level. The analysis and testing address several issues with passive shunt circuit implementation in a rotating system, including piezoelectric material integrity under centrifugal loading, shunt circuit implementation, and tip mode damping.

  18. Kernel Lattice Parallelism (KeLP)

    NSDL National Science Digital Library

    KeLP (Kernel Lattice Parallelism) is a framework for implementing portable scientific applications on distributed memory parallel computers. It is intended for applications with special needs, in particular, that adapt to data-dependent or hardware dependent conditions at run time. KeLP is currently used in full-scale applications including subsurface modeling, turbulence studies, and first principles simulation of real materials.

  19. Shunt posts in microstrip transmission lines

    NASA Astrophysics Data System (ADS)

    Finch, Kevin L.; Alexopoulos, Nicolaos G.

    1990-11-01

    Shunt posts in microstrip transmission lines are analyzed by employing the planar waveguide model. A multiple expansion method with greatly enhanced efficiency and accuracy has been achieved with the development of very fast algorithms for the computation of Schloemilch-type series. The method applies to perfectly conducting, imperfectly conducting, and composite shunt posts. This approach is compared with the standard point matching technique for perfectly conducting posts. The two methods are found to be in excellent agreement in regions of overlapping applicability. A fairly wide range of computed data is utilized to develop the tools needed to incorporate the post into various microstrip circuit applications (e.g., to obtain effective short-circuiting qualities over a broad frequency range). A Chebyshev filter was constructed using a four-post structure in a Duroid substrate, and the resulting characteristics were found to be in general agreement with theoretical predictions.

  20. Endolymphatic mastoid shunt: A reevaluation of efficacy

    Microsoft Academic Search

    D. BRADLEY WELLING; H. N. NAGARAJA

    2000-01-01

    Objectives : The main goal of this paper was to statistically reevaluate the efficacy of the endolymphatic shunt procedure for Meniere’s disease. Methods : Thomsen et al (Arch Otolaryngol 1981;107:271-7) reported on the placebo effect in surgery for Meniere’s disease in a controlled double-blind study. Thirty patients with typical Meniere’s disease in whom medical treatment failed participated in the study.

  1. Active shunt capacitance cancelling oscillator circuit

    DOEpatents

    Wessendorf, Kurt O.

    2003-09-23

    An oscillator circuit is disclosed which can be used to produce oscillation using a piezoelectric crystal, with a frequency of oscillation being largely independent of any shunt capacitance associated with the crystal (i.e. due to electrodes on the surfaces of the crystal and due to packaging and wiring for the crystal). The oscillator circuit is based on a tuned gain stage which operates the crystal at a frequency, f, near a series resonance frequency, f.sub.S. The oscillator circuit further includes a compensation circuit that supplies all the ac current flow through the shunt resistance associated with the crystal so that this ac current need not be supplied by the tuned gain stage. The compensation circuit uses a current mirror to provide the ac current flow based on the current flow through a reference capacitor that is equivalent to the shunt capacitance associated with the crystal. The oscillator circuit has applications for driving piezoelectric crystals for sensing of viscous, fluid or solid media by detecting a change in the frequency of oscillation of the crystal and a resonator loss which occur from contact of an exposed surface of the crystal by the viscous, fluid or solid media.

  2. Spontaneous portohepatic venous shunt: ultrasonographic aspect.

    PubMed

    Iliescu, Laura; Ioanitiescu, Simona; Toma, Letitia; Orban, Carmen

    2015-06-01

    We aimed to describe the imaging findings of a spontaneous portohepatic venous shunt. This is a rare entity, especially when it is not associated with risk factors such as portal hypertension or liver trauma. We report the case of a 67-year-old woman admitted to our clinic for progressive asthenia, loss of appetite, and progressive upper abdominal pain. We performed several blood tests, abdominal ultrasonography, contrast-enhanced abdominal ultrasonography, and abdominal computed tomographic scan to establish and confirm the diagnosis. Findings of ultrasound revealed a cystic mass in the right liver lobe. Liver enzymes were normal, and viral hepatitis markers as well as serology for Echinococcus granulosus were negative. There were no signs of liver cirrhosis or portal hypertension. Abdominal ultrasound and contrast-enhanced ultrasound established the diagnosis of portohepatic venous shunt; this was also confirmed by abdominal computed tomographic scan. Because the patient did not present any risk factors, the diagnosis was of spontaneous portohepatic venous shunt. PMID:25734334

  3. Bobble-head doll syndrome associated with subduroperitoneal shunt malfunction.

    PubMed

    Ahn, Y; Cho, B K; Wang, K C

    1997-04-01

    Bobble-head doll syndrome is known to be associated with aqueductal stenosis or cystic lesions of the III ventricle. The direction of movement is usually vertical. In the literature, only five cases of purely horizontal movement have been reported. Bobble-head doll syndrome manifested as a sign of shunt malfunction has been described in one case with a ventriculoperitoneal shunt. The authors report on a 10-year-old boy who showed subduroperitoneal shunt malfunction associated with horizontal bobble-head doll syndrome. The head bobbing disappeared immediately after shunt revision. Unlike the previously reported cases, in the present case the lesion was asymmetric, though the significance of this for the lateral movement is not clear. This case also showed more marked ventricular dilatation on subduroperitoneal shunt malfunction than in the pre-shunt state. The underlying mechanism of the ventricular dilatation is unknown. PMID:9202861

  4. Peritoneovenous shunt occlusion. Etiology, diagnosis, therapy.

    PubMed Central

    LeVeen, H H; Vujic, I; d'Ovidio, N G; Hutto, R B

    1984-01-01

    Electronic pressure testing of every LeVeen valve has practically eliminated mechanical malfunction as a cause of shunt failure. Nonetheless, failures do occur and in a series of 240 cases, early or late shunt failure occurred in 29 patients. Thirty-five additional cases of failures were either referred by other physicians over a period of 6 years or information and x-rays were accumulated by direct contact. Shunt failure becomes manifest by a sudden reaccumulation of ascites in patients with a previously functioning shunt. In immediate failure, the ascites may fail to disappear after surgery or reaccumulate if removed. Ideally, caval clotting should be first excluded by x-ray visualization of the superior vena prior to injection of the shunt with contrast agent. Shuntograms are done with fine-bore needles. The venous pressure is also measured. The entry of contrast into the vena cava without pooling indicates a patent venous limb. The contrast will empty from the venous tubing with forceful inspiration if the entire system is patent. The venous tube will not clear if the valve or peritoneal collecting tubes are blocked. Only the valve and collecting tube need then be replaced if contrast enters the cava but does not leave the venous tubing. Occluded valves must not be flushed to restore patency since inflammatory exudate and cellular debris are erroneously identified as "fibrin flecks." Histology and culture are mandatory. Immediate and early failure are often caused by malposition of the venous tubing. Malplacements can often be diagnosed simply by chest x-rays. Intraoperative injection of methylene blue into the venous tubing establishes a satisfactory washout prior to wound closure. Fresh clots in the vena cava can be dissolved by the slow injection of streptokinase into the venous tubing. Other patent veins are chosen for access. Patients having repeat surgery after clotting must be heparinized to prevent a similar recurrence. Flushing blood clots from the cava can be fatal. Images FIG. 1. FIG. 2. FIGS. 3A and B. FIG. 4. FIG. 5. FIG. 6. FIG. 7. FIG. 8. FIG. 10. FIG. 11. FIG. 12. FIG. 13. FIGS. 14A and B. FIG. 15. FIG. 16. FIG. 17. FIG. 18. FIGS. 19A and B. FIGS. 20A and B. PMID:6465977

  5. Controlling hysteresis in superconducting constrictions with a resistive shunt

    NASA Astrophysics Data System (ADS)

    Kumar, Nikhil; Winkelmann, C. B.; Biswas, Sourav; Courtois, H.; Gupta, Anjan K.

    2015-07-01

    We demonstrate control of the thermal hysteresis in superconducting constrictions by adding a resistive shunt. In order to prevent thermal relaxation oscillations, the shunt resistor is placed in close proximity to the constriction, making the inductive current-switching time smaller than the thermal equilibration time. We investigate the current–voltage characteristics of the same constriction with and without the shunt-resistor. The widening of the hysteresis-free temperature range is explained on the basis of a simple model.

  6. Asymptomatic shunt malfunction detected fortuitously by observation of papilloedema

    Microsoft Academic Search

    K. Arnell; E. Eriksson; L. Olsen

    2003-01-01

    Summary ¶Significant shunt malfunction is nearly always followed by headache, nausea, vomiting, lethargy and\\/or visual disturbances. In many cases there are also signs of raised intracranial pressure on computed tomography (CT). In six hydrocephalic, shunt dependent children (8–14,5 years) with no or slight symptoms shunt malfunction was detected because of papilloedema. The oedema was detected in three children at routine

  7. Mesenterico-caval shunt in rats. Technique and results.

    PubMed

    Wendling, P; Grönniger, J; Rudigier, J

    1980-01-01

    A microsurgical technique for mesenterico-caval shunting in the rat is described. The method results in a partial blood drainage from the upper abdominal content whereas the blood of the mesenteric vein is shunted to the inferior caval vein. Controls were undertaken after 1 and 3 weeks, either visually or radiologically. Twenty-two of 26 surviving animals showed patency of the shunt. All animals had undisturbed blood supply to the portal stump. PMID:7403689

  8. Intratumoral abscess: an unusual complication of ventriculoperitoneal shunt infection

    Microsoft Academic Search

    A. Shankar; G. Chacko; A. G. Chacko

    2004-01-01

    IntroductionVentriculoperitoneal shunts were routinely used in the past in children with posterior fossa tumors and hydrocephalus. They can, however, cause a multitude of problems.Case reportThis report highlights a previously unencountered phenomenon of a pyogenic abscess forming within a posterior fossa ependymoma as a result of shunt infection. The shunt was exteriorized and the child treated with antibiotics before surgery was

  9. Semi-shunt field emission in electronic devices

    NASA Astrophysics Data System (ADS)

    Karpov, V. G.; Shvydka, Diana

    2014-08-01

    We introduce a concept of semi-shunts representing needle shaped metallic protrusions shorter than the distance between a device electrodes. Due to the lightening rod type of field enhancement, they induce strong electron emission. We consider the corresponding signature effects in photovoltaic applications; they are: low open circuit voltages and exponentially strong random device leakiness. Comparing the proposed theory with our data for CdTe based solar cells, we conclude that stress can stimulate semi-shunts' growth making them shunting failure precursors. In the meantime, controllable semi-shunts can play a positive role mitigating the back field effects in photovoltaics.

  10. Semi-shunt field emission in electronic devices

    SciTech Connect

    Karpov, V. G., E-mail: victor.karpov@utoledo.edu [Department of Physics and Astronomy, University of Toledo, Toledo, Ohio 43606 (United States); Shvydka, Diana, E-mail: diana.shvydka@utoledo.edu [Department of Radiation Oncology, University of Toledo, Toledo, Ohio 43606 (United States)

    2014-08-04

    We introduce a concept of semi-shunts representing needle shaped metallic protrusions shorter than the distance between a device electrodes. Due to the lightening rod type of field enhancement, they induce strong electron emission. We consider the corresponding signature effects in photovoltaic applications; they are: low open circuit voltages and exponentially strong random device leakiness. Comparing the proposed theory with our data for CdTe based solar cells, we conclude that stress can stimulate semi-shunts' growth making them shunting failure precursors. In the meantime, controllable semi-shunts can play a positive role mitigating the back field effects in photovoltaics.

  11. Superconducting fault current-limiter with variable shunt impedance

    DOEpatents

    Llambes, Juan Carlos H; Xiong, Xuming

    2013-11-19

    A superconducting fault current-limiter is provided, including a superconducting element configured to resistively or inductively limit a fault current, and one or more variable-impedance shunts electrically coupled in parallel with the superconducting element. The variable-impedance shunt(s) is configured to present a first impedance during a superconducting state of the superconducting element and a second impedance during a normal resistive state of the superconducting element. The superconducting element transitions from the superconducting state to the normal resistive state responsive to the fault current, and responsive thereto, the variable-impedance shunt(s) transitions from the first to the second impedance. The second impedance of the variable-impedance shunt(s) is a lower impedance than the first impedance, which facilitates current flow through the variable-impedance shunt(s) during a recovery transition of the superconducting element from the normal resistive state to the superconducting state, and thus, facilitates recovery of the superconducting element under load.

  12. Portosystemic shunt syndrome and endovascular management of hepatic encephalopathy.

    PubMed

    Saad, Wael E

    2014-09-01

    The term "portosystemic shunt syndrome" was coined by Kumamoto et al referring to reduction of the hepatic reserve (reflected by progression of the Child-Pugh score) over 5 years compared with portal hypertensive cirrhotics without gastrorenal shunts or with prior history of obliterated gastrorenal shunts. Saad et al elaborated on this term further by describing a complete syndrome with clinical findings (including worsening liver failure and hepatic encephalopathy [HE]) and imaging findings (including hepatic atrophy, portal vein thrombosis, and paucity of intrahepatic portal vein radicles). This article discusses the syndrome in detail. In addition, the article describes the types of HE and the endovascular management of shunt-related HE. PMID:25177088

  13. The Retrograde Ventriculovenous Shunts: The El-Shafei Retrograde Ventriculojugular and Ventriculosinus Shunts

    Microsoft Academic Search

    Ismail L. El-Shafei; Hassan I. El-Shafei

    2010-01-01

    Retrograde ventriculovenous (RVV) shunts utilize the impact pressure of the venous bloodstream to maintain the intraventricular pressure more than the pressure in the draining venous channel and to maintain a continuous flow of cerebrospinal fluid (CSF) to the venous circulation at a rate equal to and dependent upon the rate of its formation regardless of changes in posture or intrathoracic

  14. Interaction of ventriculoperitoneal shunt and baclofen pump

    Microsoft Academic Search

    Daniel H. Fulkerson; Joel C. Boaz; Thomas G. Luerssen

    2007-01-01

    Objective  The authors present three cases of children with shunted hydrocephalus and intrathecal delivery of baclofen via an implanted\\u000a pump. Each case illustrates a potential interaction of these devices.\\u000a \\u000a \\u000a \\u000a Materials and methods  A review of the pertinent charts, operative notes, and discharge summaries was performed, along with examination of the pertinent\\u000a literature.\\u000a \\u000a \\u000a \\u000a Conclusion  The first case illustrates that a change in the pharmacology

  15. Development of Pulmonary Hypertension in Adults after Ventriculoatrial Shunt Implantation

    Microsoft Academic Search

    Stefan Kluge; Hans Jörg Baumann; Jan Regelsberger; Uwe Kehler; Barbara Koziej; Hans Klose; Ulf Greinert; Georg Kreymann; Andreas Meyer

    2009-01-01

    Background: The insertion of ventriculoatrial (VA) shunts for the treatment of hydrocephalus is thought to be associated with the development of pulmonary hypertension in adults. Objectives: It was the aim of this study to describe the frequency and the clinical spectrum of pulmonary hypertension in adults with VA shunts. Methods: Patients with pulmonary hypertension were retrospectively evaluated from January 1999

  16. INEQUALITIES FOR Lp-DUAL AFFINE SURFACE AREA

    Microsoft Academic Search

    WANG WEI; Y UAN JUN; HE BINWU

    According to the notion of Lp-affine surface area which was defined by Lutwak, in this paper, we introduce the concept of Lp-dual affine surface area. Further, we establish the affine isoperimetric inequality and the Blaschke-Santalo inequality for Lp-dual affine surface area. Besides, the dual Brunn-Minkowski inequality for Lp-dual affine surface area is presented.

  17. LARGE INEQUALITIES FOR Lp-DUAL AFFINE SURFACE AREA

    Microsoft Academic Search

    WANG WEI; Y UAN JUN; HE BINWU

    According to the notion of Lp-affine surface area which was defined by Lutwak, in this paper, we introduce the concept of Lp-dual affine surface area. Further, we establish the affine isoperimetric inequality and the Blaschke-Santalo inequality for Lp-dual affine surface area. Besides, the dual Brunn-Minkowski inequality for Lp-dual affine surface area is presented.

  18. Shunt attachment and method for interfacing current collection systems

    DOEpatents

    Denney, P.E.; Iyer, N.C.; Hannan, W.F. III.

    1992-12-08

    A composite brush to shunt attachment wherein a volatile component of a composite but mostly metallic brush, used for current collection purposes, does not upon welding or brazing, adversely affect the formation of the interfacial bond with a conductive shunt which carries the current from the zone of the brush. The brush to shunt attachment for a brush material of copper-graphite composite and a shunt of copper, or substituting silver for copper as an alternative, is made through a hot isostatic pressing (HIP). The HIP process includes applying high pressure and temperature simultaneously at the brush to shunt interface, after it has been isolated or canned in a metal casing in which the air adjacent to the interface has been evacuated and the interfacial area has been sealed before the application of pressure and temperature. 6 figs.

  19. Production of extracellular slime by coryneforms colonizing hydrocephalus shunts.

    PubMed Central

    Bayston, R; Compton, C; Richards, K

    1994-01-01

    Corynebacterium spp. are responsible for an important minority of cases of colonization of cerebrospinal fluid shunts used for the treatment of hydrocephalus. In common with coagulase-negative staphylococci, they present a serious therapeutic problem because they are often resistant to multiple antibiotics. We studied the morphologies of coryneforms in colonized hydrocephalus shunts removed from patients and observed extracellular slime similar in appearance to that seen in coagulase-negative staphylococci. We also studied a series of such isolates from other cases of hydrocephalus shunt colonization using an established laboratory model and consistently observed slime production in these shunts as well. We propose that this might be a further reason for failure to eradicate these organisms without shunt removal as well as a factor in their pathogenesis in device-related infections. Images PMID:7929761

  20. Lp-based combinatorial problem solving

    Microsoft Academic Search

    K. Hoffman; M. Padberg

    1985-01-01

    A tutorial outline of the polyhedral theory that underlies linear programming (LP)-based combinatorial problem solving is given. Design aspects of a combinatorial problem solver are discussed in general terms. Three computational studies in combinatorial problem solving using the polyhedral theory developed in the past fifteen years are surveyed: one addresses the symmetric traveling salesman problem, another the optimal triangulation of

  1. MAXIMAL FUNCTION ON GENERALIZED LEBESGUE SPACES Lp(·)

    Microsoft Academic Search

    L. DIENING

    We prove the boundedness of the Hardy-Littlewood maximal function on the general- ized Lebesgue space Lp(·)(Rd) under a continuity assumption on p that is weaker than uniform H¨ older continuity. We deduce continuity of mollifying sequences and density of C?(?) in W1,p(·)(?).

  2. Fast LP method for the Schrödinger equation

    NASA Astrophysics Data System (ADS)

    Ixaru, L. Gr.

    2007-12-01

    The LP and CP methods are two versions of the piecewise perturbation methods to solve the Schrödinger equation. On each step the potential function is approximated by a constant (for CP) or by a linear function (for LP) and the deviation of the true potential from this approximation is treated by the perturbation theory. This paper is based on the idea that an LP algorithm can be made faster if expressed in a CP-like form. We obtain a version of order 12 whose two main ingredients are a new set of formulae for the computation of the zeroth-order solution which replaces the use of the Airy functions, and a convenient way of expressing the formulae for the perturbation corrections. Tests on a set of eigenvalue problems with a very big number of eigenvalues show that the proposed algorithm competes very well with a CP version of the same order and is by one order of magnitude faster than the LP algorithms existing in the literature. We also formulate a new technique for the step width adjustment and bring some new elements for a better understanding of the energy dependence of the error for the piecewise perturbation methods.

  3. LP Daac Product Lifecyle Plan in Action

    NASA Astrophysics Data System (ADS)

    Bennett, S. D.

    2014-12-01

    The Land Processes Distributed Active Archive Center (LP DAAC) is a NASA Earth Observing System (EOS) Data and Information System (EOSDIS) DAAC that supports selected EOS Community non-standard data products such as the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) Global Emissivity Database (GED), and also supports NASA Earth Science programs such as Making Earth System Data Records for Use in Research Environments (MEaSUREs) to contribute in providing long-term, consistent, and mature data products. To support and deliver excellence for NASA data stewardship, and to accommodate long-tail data preservation with Community and MEaSUREs products, the LP DAAC introduces a Product Lifecycle Plan that features a phased project framework to facilitate long-term product preservation. The first phase, Inception, captures all artifacts applied by the Product Developer(s) and develops Earth Science Data Records based on product artifacts. The second phase, Active Archive, distributes, promotes and provides services for the matured products to the science community. The third and final phase, Long-term Archive, establishes a permanent preservation location for all project artifacts. This poster depicts the LP DAAC Product Lifecycle Plan in action using the LP DAAC recently released NASA WELD Version 1.5 artifacts and phased objectives.

  4. Vibration control via shunted embedded piezoelectric fibers

    NASA Astrophysics Data System (ADS)

    Belloli, Alberto; Niederberger, Dominik; Kornmann, Xavier; Ermanni, Paolo; Morari, Manfred; Pietrzko, Stanislaw

    2004-07-01

    The scientific community has put significant efforts into the manufacturing of sensors and actuators made of piezoceramic fibers with interdigitated electrodes. These allow for increased conformability, integrability in laminate structures and offer high coupling factors. They are of particular interest for damping applications. This paper presents a comparison between piezoceramic monolithic actuators and Active Fiber Composites (AFCs) for shunt damping. For this purpose, the different actuators were bonded on aluminum cantilever plates, respectively embedded in a glass fiber composite cantilever plate. The vibration suppression was attained by converting the electric charge by means of the converse piezoelectric effect and dissipated through robust resonant shunt circuits. A new circuit topology was used, which enables efficient damping even with low piezoelectric capacitance. An integrated FE model was implemented for prediction of the natural frequencies, the optimum values for the electric components and the resulting damping performance. Patches working in the direct 3-3 mode show much better specific damping performance than the 3-1 actuated patch. The comparison between monolithic and AFC actuators shows that AFCs fulfill integrability and performance requirements for the planned damping applications.

  5. J. Gondzio IPMs for L IPM for LP: Motivation

    E-print Network

    Hall, Julian

    J. Gondzio IPMs for L Part 1: IPM for LP: Motivation NATCOR, Edinburgh, June 2014 J. Gondzio IPMs)! vertices. NATCOR, Edinburgh, June 2014 J. Gondzio IPMs for LP School of Mathematics THE U N I V E RS ITY.Gondzio@ed.ac.uk URL: http://www.maths.ed.ac.uk/~gondzio NATCOR, Edinburgh, June 2014 1 J. Gondzio IPMs for LP Outline

  6. Laparoscopy for ventriculoperitoneal shunt implantation and revision surgery.

    PubMed

    Pinto, Fernando Campos Gomes; de Oliveira, Matheus Fernandes

    2014-09-16

    Ventriculoperitoneal shunting (VPS) is a widely accepted technique for the treatment of hydrocephalus. The probability of shunt dysfunction is pretty high throughout life. Laparoscopy has become a valuable tool to perform VPS and treat abdominal complications. An electronic literature search was performed to reveal the published data relating laparoscopy and ventriculoperitoneal shunt in Medline, Embase, Scielo and Lilacs databases. The keywords employed were "laparoscopy" OR "laparoscopic surgery" AND "ventriculoperitoneal shunt" OR "shunt" AND "surgery" OR "implantation" OR "revision" OR "complication". No high quality trials were developed comparing conventional laparotomic incision vs laparoscopic approach. Both approaches have evolved and currently there are less invasive options for laparotomy, like periumbilical small incisions; and for laparoscopy, like smaller and less incisions. Operating room time, blood loss and hospital stay may be potentially smaller in laparoscopic surgery and complications are probably the same as laparotomy. In revision surgery for abdominal complications after VPS, visualization of whole abdominal cavity is fundamental to address properly the problem and laparoscopic approach is valuable once it is safe, fast and much less invasive than laparotomy. Ventriculoperitoneal shunting is a widely accepted technique for the treatment of hydrocephalus. Laparoscopy assisted shunt surgery in selected cases might be a less invasive and more effective option for intrabdominal manipulation. The laparoscopic approach allows a better catheter positioning, lysis of fibrotic bundles and peritoneal inspection as well, without any additional complication. PMID:25228943

  7. Shunt malfunction presenting with symptomatic syringomyelia: Demonstrated on contrast ventriculogram

    PubMed Central

    Aniruddha, T. J; Pruthi, Nupur

    2014-01-01

    Ventriculoperitoneal (VP) shunt malfunction commonly presents as raised intracranial pressure. Rarely, when the central canal of the spinal cord communicates with the 4th ventricle, shunt malfunction can present as an expanding syrinx. The diagnosis is often delayed, resulting in severe morbidity. Some of these patients undergo repeated syrinx surgeries without much benefits. We report a case of chronic tuberculous meningitis with shunt malfunction presenting as an expanding spinal canal syrinx and quadriparesis. Fourth ventricular communication with syrinx was demonstrated with the help of a contrast ventriculogram. After shunt revision, syrinx resolved completely and the patient made significant improvement in his neurological deficits. The present case illustrates that a historical and rarely used investigation like contrast ventriculogram aids in the diagnosis and management even in the current neurosurgical practice. All patients with late onset syrinx and a previous VP shunt need to be investigated for shunt malfunction before considering syrinx surgery. A simple shunt revision resolves the syrinx in such conditions and avoids more complex procedures like Foramen magnum decompression. Relevant literature has been reviewed; pathophysiology and management options have been discussed. PMID:25250067

  8. The hydrokinetic parameters of shunts for hydrocephalus might be inadequate

    PubMed Central

    Sotelo, Julio

    2012-01-01

    Long-term treatment of hydrocephalus continues to be dismal. Shunting is the neurosurgical procedure more frequently associated with complications, which are mostly related with dysfunctions of the shunting device, rather than to mishaps of the rather simple surgical procedure. Overdrainage and underdrainage are the most common dysfunctions; of them, overdrainage is a conspicuous companion of most devices. Even when literally hundreds of different models have been proposed, developed, and tested, overdrainage has plagued all shunts for the last 60 years. Several investigations have demonstrated that changes in the posture of the subject induce unavoidable and drastic differences of intraventricular hydrokinetic pressure and cerebrospinal fluid (CSF) drainage through the shunt. Of all the parameters that participate in the pathophysiology of hydrocephalus, the only invariable one is cerebrospinal fluid production at a constant rate of approximately 0.35 ml/min. However, this feature has not been considered in the design of currently available shunts. Our experimental and clinical studies have shown that a simple shunt, whose drainage capacity complies with this unique parameter, would prevent most complications of shunting for hydrocephalus. PMID:22530174

  9. The hydrokinetic parameters of shunts for hydrocephalus might be inadequate.

    PubMed

    Sotelo, Julio

    2012-01-01

    Long-term treatment of hydrocephalus continues to be dismal. Shunting is the neurosurgical procedure more frequently associated with complications, which are mostly related with dysfunctions of the shunting device, rather than to mishaps of the rather simple surgical procedure. Overdrainage and underdrainage are the most common dysfunctions; of them, overdrainage is a conspicuous companion of most devices. Even when literally hundreds of different models have been proposed, developed, and tested, overdrainage has plagued all shunts for the last 60 years. Several investigations have demonstrated that changes in the posture of the subject induce unavoidable and drastic differences of intraventricular hydrokinetic pressure and cerebrospinal fluid (CSF) drainage through the shunt. Of all the parameters that participate in the pathophysiology of hydrocephalus, the only invariable one is cerebrospinal fluid production at a constant rate of approximately 0.35 ml/min. However, this feature has not been considered in the design of currently available shunts. Our experimental and clinical studies have shown that a simple shunt, whose drainage capacity complies with this unique parameter, would prevent most complications of shunting for hydrocephalus. PMID:22530174

  10. Perforation of the Distal End of the Ventriculoperitoneal Shunt into the Bladder with Calculus Formation

    Microsoft Academic Search

    K. V. Ramana Murthy; S. Jayaram Reddy; D. V. S. R. K. Prasad

    2009-01-01

    The placement of a ventriculoperitoneal (VP) shunt is the most common form of treatment for hydrocephalus.The distal end of the VP shunt is commonly placed in the peritoneal cavity. Various complications of the distal end of the shunt have been described in the literature.We report an unusual case of perforation of the distal end of the VP shunt into the

  11. Baseline Neuropsychological Profile and Cognitive Response to Cerebrospinal Fluid Shunting for Idiopathic Normal Pressure Hydrocephalus

    Microsoft Academic Search

    George Thomas; Matthew J. McGirt; Graeme Woodworth; Jennifer Heidler; Daniele Rigamonti; Argye E. Hillis; Michael A. Williams

    2005-01-01

    Objective: To evaluate neurocognitive changes and predict neurocognitive outcome after ventriculoperitoneal shunting for idiopathic normal pressure hydrocephalus (INPH). Background: Reports of neurocognitive response to shunting have been variable and studies that predict cognitive outcomes after shunting are limited. We reviewed our experience with cognitive outcomes for INPH patients who were selected for shunting based on abnormal cerebrospinal fluid (CSF) pressure

  12. Spontaneous intrahepatic portosystemic shunt managed by laparoscopic hepatic vein closure

    PubMed Central

    Kwon, Jung-Nam; Jeon, Yong Sun; Cho, Soon-Gu; Lee, Keon-Young; Hong, Kee Chun

    2014-01-01

    Intrahepatic portosystemic shunt (IPSS) is uncommon and usually follows trauma or iatrogenic injury, but spontaneous shunts may also occur, in patients without the evidence of chronic liver disease. Although interventional endovascular management of the shunts is the treatment of choice, a surgical approach can be used when the percutaneous approach fails. We report here a case of symptomatic spontaneous IPSS between the posteroinferior branch of right portal vein and the right inferior hepatic vein, which was successfully managed with laparoscopic closure of the hepatic vein. To the best of our knowledge, this is the first case report of laparoscopic management of spontaneous IPSS. PMID:25336823

  13. Ion beam sputter-etched ventricular catheter for hydrocephalus shunt

    NASA Technical Reports Server (NTRS)

    Banks, B. A. (inventor)

    1983-01-01

    A cerebrospinal fluid shunt in the form of a ventricular catheter for controlling the condition of hydrocephalus by relieving the excessive cerebrospinal fluid pressure is described. A method for fabrication of the catheter and shunting the cerebral fluid from the cerebral ventricles to other areas of the body is also considered. Shunt flow failure occurs if the ventricle collapse due to improper valve function causing overdrainage. The ventricular catheter comprises a multiplicity of inlet microtubules. Each microtubule has both a large openings at its inlet end and a multiplicity of microscopic openings along its lateral surfaces.

  14. 21 CFR 876.5955 - Peritoneo-venous shunt.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

  15. 21 CFR 876.5955 - Peritoneo-venous shunt.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

  16. 21 CFR 876.5955 - Peritoneo-venous shunt.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

  17. 21 CFR 876.5955 - Peritoneo-venous shunt.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

  18. 21 CFR 876.5955 - Peritoneo-venous shunt.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

    ...FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) MEDICAL DEVICES GASTROENTEROLOGY-UROLOGY DEVICES Therapeutic Devices § 876.5955 Peritoneo-venous shunt. (a) Identification. A...

  19. Fatal intratumoral hemorrhage in posterior fossa tumors following ventriculoperitoneal shunt.

    PubMed

    Santhanam, R; Balasubramaniam, Anandh; Chandramouli, B A

    2009-01-01

    We report on two patients with rare major intratumoral hemorrhage following ventriculoperitoneal shunt in posterior fossa tumors. A 28-year-old woman with a midline posterior fossa lesion, whose imaging features suggested a fourth ventricular ependymoma with obstructive hydrocephalus, was subjected to a right ventriculoperitoneal shunt. Her consciousness deteriorated, and she experienced massive intratumoral hemorrhage and later died. An eight-year-old girl presented with raised intracranial pressure and ataxia caused by vermian astrocytoma with obstructive hydrocephalus. She also developed a massive tumor bleed following a ventriculoperitoneal shunt and was subjected to emergency decompression of the tumor with the bleeding. She remained vegetative at discharge and died 18 months later. Intratumoral hemorrhage is a rare but important cause of morbidity and mortality in patients with posterior fossa tumors who undergo ventriculoperitoneal shunt. PMID:19013806

  20. 6. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    6. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

  1. 8. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    8. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

  2. 5. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    5. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

  3. 4. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    4. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

  4. 7. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    7. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

  5. 9. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    9. VIEW OF SHUNT LOCOMOTIVE NO. 9072 POSITIONING ELECTRIC DIESEL LOCOMOTIVE NO. 6734 ON TURNTABLE, adjacent to Erecting Shop and Machine Shop - Juniata Shops, Turntable, South of Sixth Street at Third Avemue, Altoona, Blair County, PA

  6. Assessment of shunt volumes in children with ventricular septal defects

    Microsoft Academic Search

    Anoosh Esmaeili; Rene Höhn; Arne Koch; Thomas Josef Vogl; Roland Hofstetter; Nasreddin Abolmaali

    2006-01-01

    Summary  The aim of this study was to compare the results of magnetic resonance based shunt volume measurements with the results of\\u000a the invasive method by the principle of Fick. In 14 children (median age: 16.5 months) with ventricular septal defects the\\u000a shunt volume was quantified by magnetic resonance flow measurements under spontaneous breathing conditions as well as with\\u000a invasive angiography

  7. Bobble-head doll syndrome associated with subduroperitoneal shunt malfunction

    Microsoft Academic Search

    Yong Ahn; Byung-Kyu Cho; Kyu-Chang Wang

    1997-01-01

    Bobble-head doll syndrome is known to be associated with aqueductal stenosis or cystic lesions of the III ventricle. The\\u000a direction of movement is usually vertical. In the literature, only five cases of purely horizontal movement have been reported.\\u000a Bobble-head doll syndrome manifested as a sign of shunt malfunction has been described in one case with a ventriculoperitoneal\\u000a shunt. The authors

  8. Ventriculoperitoneal shunt infection with Mycobacterium fortuitum: a rare offending organism.

    PubMed

    Cadena, Gilbert; Wiedeman, Jean; Boggan, James E

    2014-12-01

    Postsurgical infection is one of the greatest potential morbidities of ventriculoperitoneal shunt surgery. The majority of infections can be linked to contamination with skin flora at the time of surgery, a phenomenon that has been well described. However, there is a paucity of literature regarding infection with nontuberculous mycobacteria. The authors report a case of postoperative ventriculoperitoneal shunt infection with Mycobacterium fortuitum and review the available neurosurgical literature and treatment strategies. PMID:25325413

  9. Fatal intratumoral hemorrhage in posterior fossa tumors following ventriculoperitoneal shunt

    Microsoft Academic Search

    R. Santhanam; Anandh Balasubramaniam; B. A. Chandramouli

    2009-01-01

    We report on two patients with rare major intratumoral hemorrhage following ventriculoperitoneal shunt in posterior fossa tumors. A 28-year-old woman with a midline posterior fossa lesion, whose imaging features suggested a fourth ventricular ependymoma with obstructive hydrocephalus, was subjected to a right ventriculoperitoneal shunt. Her consciousness deteriorated, and she experienced massive intratumoral hemorrhage and later died. An eight-year-old girl presented

  10. Aberrant Gene Expression in Dogs with Portosystemic Shunts

    PubMed Central

    Grinwis, Guy C. M.; Kummeling, Anne; van Gils, Ingrid H. M.; Koerkamp, Marian J. A. Groot.; van Leenen, Dik; Holstege, Frank C. P.; Penning, Louis C.; Rothuizen, Jan; Leegwater, Peter A. J.; Spee, Bart

    2013-01-01

    Congenital portosystemic shunts are developmental anomalies of the splanchnic vascular system that cause portal blood to bypass the liver. Large-breed dogs are predisposed for intrahepatic portosystemic shunts (IHPSS) and small-breed dogs for extrahepatic portosystemic shunts (EHPSS). While the phenotype resulting from portal bypass of the liver of the two types of shunt is identical, the genotype and molecular pathways involved are probably different. The aim of this study was to gain insight into the pathways involved in the different types of portosystemic shunting. Microarray analysis of mRNA expression in liver tissue from dogs with EHPSS and IHPSS revealed that the expression of 26 genes was altered in either IHPSS or EHPSS samples compared with that in liver samples from control dogs. Quantitative real-time PCR of these genes in 14 IHPSS, 17 EHPSS, and 8 control liver samples revealed a significant differential expression of ACBP, CCBL1, GPC3, HAMP, PALLD, VCAM1, and WEE1. Immunohistochemistry and Western blotting confirmed an increased expression of VCAM1 in IHPSS but its absence in EHPSS, an increased WEE1 expression in IHPSS but not in EHPSS, and a decreased expression of CCBL1 in both shunt types. Regarding their physiologic functions, these findings may indicate a causative role for VCAM1 in IHPSS and WEE1 for IHPSS. CCBL1 could be an interesting candidate to study not yet elucidated aspects in the pathophysiology of hepatic encephalopathy. PMID:23451256

  11. Tracheo-esophageal shunt speech: report of an unusual case.

    PubMed

    Sakakura, A; Yamamoto, Y; Imanaka, M; Saka, T; Makimoto, K; Takahashi, H

    1995-01-01

    A rare case of laryngectomee who acquired TE shunt speech is reported. Our patient was a 64-year-old woman with laryngeal cancer (glottic type T3N0M0). She underwent laryngectomy in 1990, and a Komorn tracheo-esophageal shunt operation was performed simultaneously. A voice prosthesis (BIVONA) was inserted into the shunt, but the voice valve was not used. She acquired shunt speech soon after the operation, and there was no need to close the tracheostoma during phonation. Fiberoptic, X-ray and aerodynamic findings of the shunt and esophagus were as follows: (i) The one-way valve of the voice prosthesis was open during inspiration and closed during phonation. (ii) Swallowing of air, as seen in esophageal speech, was not observed. (iii) The neoglottis was in the upper part of the esophagus. It was concluded that the air for the vibration of the neoglottis entered the esophagus through the T-E shunt during inspiration. PMID:8561703

  12. HARDY-LITTLEWOOD MAXIMAL OPERATOR ON Lp(x)(R)

    Microsoft Academic Search

    ALES NEKVINDA

    We consider Hardy-Littlewood maximal operator on the general Lebesgue space Lp(x)(Rn) with variable exponent. A sufficient condition on the function p is known for the boundedness of the maximal operator on Lp(x)(?) with an open bounded ? .O ur main aim is to find an additional condition to p to guarantee the boundedness of the maximal operator on Lp(x)(Rn). From

  13. Lp-PLA2: A New Kid on the Block

    Microsoft Academic Search

    Andrew Zalewski; Jeanenne J. Nelson; Lisa Hegg; Colin Macphee

    2006-01-01

    Background: Atherosclerosis is a systemic disease with focal rupture of vulnerable plaque responsible for ma- jor clinical events. Several population-based studies indicate an association between lipoprotein-associated phospholipase A2 (Lp-PLA2) and cardiovascular events. Lp-PLA2 is emerging as a biomarker that may be a potential link between oxidized LDL cholesterol and multifocal plaque vulnerability. Content: Lp-PLA2 is produced by inflammatory cells of

  14. Laparoscopic treatment of abdominal complications following ventriculoperitoneal shunt

    PubMed Central

    Grigorean, VT; Onose, G; Popescu, M; Strambu, V; Sandu, AM

    2009-01-01

    The aim of this study is the evaluation of laparoscopic treatment in abdominal complications following ventriculoperitoneal (VP) shunt. Methods: We report a retrospective study including 17 patients with abdominal complications secondary to VP shunt for hydrocephalus, laparoscopically treated in our department, between 2000 and 2007. Results: Patients' age ranged from 1 to 72 years old (mean age 25.8 years old). Male: female ratio was 1.4. Abdominal complications encountered were: shunt disconnection with intraperitoneal distal catheter migration 47.05% (8/17), infections 23.52% (4/17) such as abscesses and peritonitis, pseudocysts 11.76% (2/17), CSF ascites 5.88% (1/17), inguinal hernia 5.88% (1/17), and shunt malfunction due to excessive length of intraperitoneal tube 5.88% (1/17). Free–disease interval varies from 1 day to 21 years, depending on the type of complication, short in peritoneal irritation syndrome and abscesses (days) and long in ascites, pseudocysts(months– years). Laparoscopic treatment was: extraction of the foreign body in shunt disconnection with intraperitoneal distal catheter migration, evacuation, debridement, lavage and drainage for pseudocysts, abscess and peritonitis, shortening of the tube in shunt malfunction due to excessive length of intraperitoneal tube a nd hernioraphy. One diagnostic laparoscopy was performed in a peritoneal irritation syndrome, which found only CSF ascites. There were no conversions to open surgery. The overall mortality was of 5.88% and postoperative morbidity was of 11.76%. In 7 patients operated for abscesses, peritonitis, pseudocysts, and CSF ascites the shunting system was converted in to a ventriculocardiac shunt. Conclusions: Abdominal complication following VP shunt can be successfully performed laparoscopically. Abdominal surgery required, in selected cases, the repositioning of the distal catheter, frequently as a ventriculocardiac shunt. There are abdominal complications with no indication of surgery, like peritoneal irritation syndrome and CSF ascites. Free– disease interval varies from days (peritoneal irritation syndrome, abscesses) to month–years (pseudocyst, ascites), according to type of complication. PMID:20108757

  15. [A case of repeated shunt malfunctions with eosinophilic meningitis caused by silicone allergy].

    PubMed

    Kambara, Mizuki; Miyazaki, Takeshi; Yoshikane, Tsutomu; Sugimoto, Keiji; Akiyama, Yasuhiko

    2014-12-01

    The ventricular-peritoneal shunt for hydrocephalus is a well-known and established method but is sometimes complicated by shunt malfunction due to several causes. Eosinophilic meningitis is a rare disease, but has occasionally been reported as a cause of shunt malfunction. Here, we report the case of a 74-year-old woman with repeated shunt malfunction and eosinophilic meningitis due to a silicone allergy. Originally, the patient received a ventricular-peritoneal shunt for normal pressure hydrocephalus secondary to subarachnoid hemorrhage. However, shunt malfunction was identified 6 weeks later, and the first shunt revision was performed using a new shunt system from a different company. Further evaluation to identify the cause of the shunt malfunction revealed no abnormal findings, except for eosinophilia in the serum and cerebrospinal fluid. A second shunt malfunction was identified 16 weeks after the first shunt revision. We therefore concluded that eosinophilic meningitis caused by a silicone allergy might be the real culprit and a second shunt revision was performed using a silicone "extracted" tube. Since then, the patient's course has been free from shunt malfunction. In this case, the serum and cerebrospinal fluid eosinophilia were useful markers for identifying the cause of repeated shunt malfunctions. The silicone "extracted" tube may be helpful for diagnosis and therapy. PMID:25433060

  16. Growth of the pulmonary arteries after systemic-pulmonary shunt.

    PubMed

    Ishikawa, S; Takahashi, T; Sato, Y; Suzuki, M; Murakami, J; Hasegewa, Y; Mohara, J; Oshima, K; Ohtaki, A; Morishita, Y

    2001-12-01

    Pulmonary artery growth after a systemic-pulmonary shunt was angiographically evaluated in 19 out of 35 patients. The mean age of the subjects at the time of the initial operation was 18+/-18 months including 12 patients under a year old. The preoperative diagnosis was tetralogy of Fallot (TOF) in 10 patients, TOF plus pulmonary atresia in five and transposition of great arteries in four. A Blalock-Taussig shunt (BTS) operation was performed in 16 patients (15 classical and 1 modified) and a central shunt was performed in three patients as an initial operation. The preoperative pulmonary artery index (PAI) was 129+/-42 in all patients and there were no significant differences between patients under or over a year old (139+/-42 vs. 115+/-49). Postoperative angiography was performed 32+/-13 months after the surgery. Room air arterial O2 pressure increased significantly from 29+/-5 mmHg to 42+/-5 mmHg just after an initial palliative shunt operation. PAI change in patients under a year old was 214+/-73%, which was higher than 145+/-27% in patients over a year old after a palliative shunt operation. On the ipsilateral side, PAI change was almost the same between patients under and over a year old. On the contralateral side, PAI change in patients under a year old was 216+/-68%, which was significantly higher than the 116+/-21% in patients over one year old. There was a significant negative correlation (r=-0.65, p<0.05) between PAI change and arterial O2 pressure as measured just after a palliative shunt operation. In conclusion, a palliative shunt operation prior to a year old is desirable in order to produce sufficient and bilateral pulmonary artery growth. PMID:11888472

  17. Attenuation of Congenital Portosystemic Shunt Reduces Inflammation in Dogs

    PubMed Central

    Tivers, Michael S.; Handel, Ian; Gow, Adam G.; Lipscomb, Victoria J.; Jalan, Rajiv; Mellanby, Richard J.

    2015-01-01

    Liver disease is a major cause of morbidity and mortality. One of the most significant complications in patients with liver disease is the development of neurological disturbances, termed hepatic encephalopathy. The pathogenesis of hepatic encephalopathy is incompletely understood, which has resulted in the development of a wide range of experimental models. Congenital portosystemic shunt is one of the most common congenital disorders diagnosed in client owned dogs. Our recent studies have demonstrated that the pathophysiology of canine hepatic encephalopathy is very similar to human hepatic encephalopathy, which provides strong support for the use of dogs with a congenital portosystemic shunt as a naturally occurring model of human hepatic encephalopathy. Specifically, we have demonstrated an important role for ammonia and inflammation in the development of hepatic encephalopathy in dogs with a congenital portosystemic shunt. Despite the apparent importance of inflammation in driving hepatic encephalopathy in dogs, it is unclear whether inflammation resolves following the successful treatment of liver disease. We hypothesized that haematological and biochemical evidence of inflammation, as gauged by neutrophil, lymphocyte and monocyte concentrations together with C-reactive protein concentrations, would decrease following successful treatment of congenital portosystemic shunts in dogs. One hundred and forty dogs with a congenital portosystemic shunt were enrolled into the study. We found that the proportion of dogs with a monocyte concentration above the reference range was significantly greater in dogs with hepatic encephalopathy at time of initial diagnosis. Importantly, neutrophil and monocyte concentrations significantly decreased following surgical congenital portosystemic shunt attenuation. We also found a significant decrease in C-reactive protein concentrations following surgical attenuation of congenital portosystemic shunts. Our study demonstrates that haematological and biochemical indices of inflammation reduce following successful treatment of the underlying liver disorder. PMID:25658922

  18. Coherence properties of a capacitively-shunt flux qubit

    NASA Astrophysics Data System (ADS)

    Birenbaum, Jeffrey; Sears, Adam; Nugroho, Christopher; Gudmundsen, Ted; Welander, Paul; Yoder, Jonilyn; Kamal, Archana; Gustavsson, Simon; Kerman, Jamie; Oliver, William; Clarke, John

    2014-03-01

    Coherence times for typical flux qubits have plateaued at 5 - 10 ? s for T1 and 1 - 3 ? s for TRamsey. To achieve longer coherence times we study capacitively-shunted flux qubits using high-Q capacitors to individually shunt all four Josephson junctions (JJs). The additional shunt capacitance moves 90 + % of the qubit energy from the lossy capacitance of the JJs into the high-Q shunts while preserving an anharmonicity greater than 100 % and maintaining f01 shunted flux qubit inductively coupled to a lumped-element readout resonator. The qubit junctions are deposited via aluminum e-beam evaporation using a bridgeless mask. We characterize the influence of qubit design parameters such as capacitance and geometry on the coherence time of the device. This research was funded in part by the Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA), through the Army Research Office.

  19. 76 FR 11446 - Erie Boulevard Hydropower, LP; Notice of Application Accepted for Filing, Soliciting Motions to...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-02

    ...Project No. 2047-049] Erie Boulevard Hydropower, LP; Notice of Application Accepted...2011. d. Applicant: Erie Boulevard Hydropower, LP. e. Name of Project: Stewarts...Compliance Specialist, Erie Boulevard Hydropower, LP, Hudson River Operations,...

  20. 78 FR 7442 - Accreditation and Approval of Chemical and Petrochemical Inspections, LP, as a Commercial Gauger...

    Federal Register 2010, 2011, 2012, 2013, 2014

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    ...Accreditation and Approval of Chemical and Petrochemical Inspections, LP, as a Commercial...accreditation and approval of Chemical and Petrochemical Inspections, LP, as a commercial...CBP regulations, that Chemical and Petrochemical Inspections, LP, has been...

  1. Spine proofs for Lp -convergence of branching-diffusion

    E-print Network

    Harris, Simon Colin

    Spine proofs for Lp -convergence of branching-diffusion martingales Robert Hardy and Simon C spine proofs of the Lp -convergence of some key additive martingales for three distinct models of branching diffusions, including branching Brownian motion. The spine techniques we develop give clear

  2. Parallel solution of block angular LP problems using Kaul's algorithm

    E-print Network

    Hall, Julian

    ­474 · Achieved linear speed-up Remarkable numerical stability · Applied to data mining problems ParallelParallel solution of block angular LP problems using Kaul's algorithm Ilkay Boduro~glu1 , Julian, University of Edinburgh November 7th 2007 Parallel solution of block angular LP problems using Kaul

  3. Proceedings of the symposium on LP-gas odorization technology

    SciTech Connect

    Not Available

    1989-01-01

    This book presents the proceedings of a symposium of LP-gas odorization technology. Topics include ethyl mercaptan odorant stability in stored liquid propane gas, characterization of LP-gas odorant fade, and a solid-state gas sensor and its applications.

  4. Tunable-Delay Shunts for Paper Microfluidic Devices

    PubMed Central

    Toley, Bhushan J.; McKenzie, Brittney; Liang, Tinny; Buser, Joshua R.; Yager, Paul; Fu, Elain

    2014-01-01

    We demonstrate a novel method for controlling fluid flow in paper-based devices. The method delays fluid progress through a porous channel by diverting fluid into an absorbent pad-based shunt placed into contact with the channel. Parameters to control the delay include the length and the thickness of the shunt. Using this method, reproducible delays ranging from 3 to 20 minutes were achieved. A simple electrical circuit model was presented and used to predict the delays in a system. Results from the model showed good agreement with experimental observations. Finally, the shunts were used for the sequential delivery of fluids to a detection zone in a point-of-care compatible folding card device using biochemical reagents for the amplified detection of the malaria protein PfHRP2. PMID:24245747

  5. In Vitro and In Vivo Comparison of Two Suprachoroidal Shunts

    PubMed Central

    Oatts, Julius T.; Zhang, Ze; Tseng, Harry; Shields, M. Bruce; Sinard, John H.; Loewen, Nils A.

    2013-01-01

    Purpose. To compare fibrosis, aqueous humor dynamics, and intraocular pressure (IOP) of two suprachoroidal shunts as part of a new class of glaucoma drainage devices. Methods. Following proliferation analysis in vitro, 20 rabbits were implanted with either a gold shunt (GS, GMSplus+, SOLX) or a polypropylene shunt (PS, Aquashunt, OPKO). Ten eyes received mitomycin C (MMC) and triamcinolone. Peak and trough IOP were monitored with a pneumatonometer and tono-pen for 15 weeks. Aqueous humor dynamics were evaluated fluorophotometrically and tonographically. Fibrosis was quantified. Results. In vitro proliferation was similar. In vivo, both shunts were devoid of foreign body reaction but exhibited fibrosis, and GS showed vascularization. There was no significant difference in aqueous or uveoscleral flow. Preoperative morning IOP was 23.7 ± 2 mm Hg, and evening IOP was 26.5 ± 2 mm Hg (P = 0.000). Morning IOP was decreased through 15 weeks and evening IOP through 8 weeks in all groups. The morning IOP decrease was most profound at 15 weeks in PS (41%) compared to GS (18%). Antifibrotics initially enhanced but eventually diminished shunt performance. At 15 weeks, thickness of scleral fibrosis was greater in GS (246 ± 47 ?m) and PS (188 ± 47 ?m, P = 0.285) compared with GS+MMC (109 ± 26 ?m, P = 0.023 to GS) and PS+MMC (48 ± 30 ?m, P = 0.028 to PS). Conclusions. In a rabbit model, suprachoroidal polypropylene and gold shunts allow access to a new drainage pathway with different IOP profiles that can be modified with antifibrotics. PMID:23847318

  6. Shunted Piezoelectric Vibration Damping Analysis Including Centrifugal Loading Effects

    NASA Technical Reports Server (NTRS)

    Min, James B.; Duffy, Kirsten P.; Provenza, Andrew J.

    2011-01-01

    Excessive vibration of turbomachinery blades causes high cycle fatigue problems which require damping treatments to mitigate vibration levels. One method is the use of piezoelectric materials as passive or active dampers. Based on the technical challenges and requirements learned from previous turbomachinery rotor blades research, an effort has been made to investigate the effectiveness of a shunted piezoelectric for the turbomachinery rotor blades vibration control, specifically for a condition with centrifugal rotation. While ample research has been performed on the use of a piezoelectric material with electric circuits to attempt to control the structural vibration damping, very little study has been done regarding rotational effects. The present study attempts to fill this void. Specifically, the objectives of this study are: (a) to create and analyze finite element models for harmonic forced response vibration analysis coupled with shunted piezoelectric circuits for engine blade operational conditions, (b) to validate the experimental test approaches with numerical results and vice versa, and (c) to establish a numerical modeling capability for vibration control using shunted piezoelectric circuits under rotation. Study has focused on a resonant damping control using shunted piezoelectric patches on plate specimens. Tests and analyses were performed for both non-spinning and spinning conditions. The finite element (FE) shunted piezoelectric circuit damping simulations were performed using the ANSYS Multiphysics code for the resistive and inductive circuit piezoelectric simulations of both conditions. The FE results showed a good correlation with experimental test results. Tests and analyses of shunted piezoelectric damping control, demonstrating with plate specimens, show a great potential to reduce blade vibrations under centrifugal loading.

  7. Portacaval Shunt Established in Six Dogs Using Magnetic Compression Technique

    PubMed Central

    Yan, Xiaopeng; Fan, Chao; Ma, Jia; Li, Jianhui; Dong, Dinghui; Wang, Haohua; Ma, Feng; Zheng, Xinglong; Lv, Yi

    2013-01-01

    Background and Aims Installing the transjugular intrahepatic portosystemic shunt for portal hypertension is relatively safe, but complications are still high. To explore a new method of portacaval shunt, the magnetic compression technique was introduced into the shunting procedure. Methods A portal-inferior vena cava shunt was performed on 6 male mongrel dogs by two hemocompatible Nd-Fe-B permanent magnets, parent and daughter. The parent magnet was applied to the inferior vena cava guided by a catheter through the femoral vein. The daughter magnet was moved to the anastomosis position on the portal vein with a balloon catheter through the splenic vein. After the daughter magnet reached the target position, the two magnets acted to compress the vessel wall and hold it in place. Five to 7 days later, under X-ray guidance, the magnets were detached from the vessel wall with a rosch-uchida transjugular liver access set. One month later, histological analysis and portal venography were performed. Results 5-7 days after the first surgery, a mild intimal hyperplasia in the portal vein and the inferior vena cava, and continuity of the vascular adventitia from the portal vein to the inferior vena cava as observed. During the second surgery, the contrast media could be observed flowing from the portal vein into the inferior vena cava. Portal venography revealed that the portosystemic shunt was still present one month after the second surgery. Conclusions Magnamosis via a device of novel design was successfully used to establish a portacaval shunt in dogs. PMID:24098809

  8. Detailed study of modal gain in a multimode EDFA supporting LP01 and LP11 mode group amplification

    E-print Network

    Quartly, Graham

    Detailed study of modal gain in a multimode EDFA supporting LP01 and LP11 mode group amplification modes in a MM-EDFA. The differential modal gains are reduced by fiber design and control of the pump optics amplifiers and oscillators. 1. Introduction There are concerns that radically new fiber designs

  9. 75 FR 8322 - EPIC Merchant Energy NJ/PA, LP, SESCO Enterprises, LLC, Coaltrain Energy, LP, Complainants, v...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-02-24

    ...Energy Regulatory Commission [Docket No. EL10-40-000] EPIC Merchant Energy NJ/PA, LP, SESCO Enterprises, LLC, Coaltrain...Rules of Practice and Procedure, 18 CFR 385.206 (2009), EPIC Merchant Energy NJ/PA, LP, SESCO Enterprises, LLC,...

  10. Comparison of transient phenomena when switching shunt reactors on the line's two terminals and station busbar

    Microsoft Academic Search

    Ching-Yin Lee; Chang-Jhih Chen; Chao-Rong Chen; Yen-Feng Hsu

    2004-01-01

    This paper investigates the transient phenomena when switching high voltage shunt reactors on the operation of Tai-power system. Two cases that shunt reactors were installed respectively at 345 kV line's two terminals and 161 kV station busbar were studied and compared. When shunt reactor was closing, high unsymmetrical currents could be occurred with long time constant; when shunt reactor was

  11. Transjugular intrahepatic portosystemic stent-shunt (TIPSS) occlusion and the role of biliary venous fistulae

    Microsoft Academic Search

    Rajiv Jalan; David J. Harrison; Doris N. Redhead; Peter C. Hayes

    1996-01-01

    Background\\/Aim: The aim of this study was to assess the pathology and pathogenic mechanisms involved in the occlusion of transjugular intrahepatic portosystemic stent-shunts.Methods: Thirty-four patients with transjugular intrahepatic portosystemic stent-shunt who had at least two portographic assessments of shunt function were the subjects of this study. The contents of any shunt demonstrating >70% stenosis were biopsied before balloon dilatation. Further

  12. Syringomyelia with quadriparesis in CSF shunt malfunction: a case illustration

    Microsoft Academic Search

    Juan F. Martínez-Lage; Fernando Alarcón; Antonio López López-Guerrero; Matías Felipe-Murcia; Antonio Ruíz-Espejo Vilar; María-José Almagro

    2010-01-01

    Background  Shunt malfunction typically presents with headaches, vomiting, and impaired consciousness. Paraparesis has been rarely reported\\u000a as the initial manifestation of valve dysfunction.\\u000a \\u000a \\u000a \\u000a \\u000a Case illustration  A 17-year-old boy was admitted with invalidating quadriparesis that after neuroimaging evaluation was found to be produced\\u000a by communicating syringomyelia attributed to shunt malfunction.\\u000a \\u000a \\u000a \\u000a \\u000a Discussion and conclusion  Persistence of the central canal in association with communicating hydrocephalus may

  13. Potts Shunt in Patients with Primary Pulmonary Hypertension

    PubMed Central

    Kim, Sue Hyun; Jang, Woo-Sung; Lim, Hong-Gook; Kim, Yong-Jin

    2015-01-01

    Idiopathic pulmonary arterial hypertension eventually leads to right-sided heart failure and sudden death. Its mortality rate in children is still high, despite improvements in pharmacological therapy, and therefore novel treatments are necessary. The Potts shunt, which creates an anastomosis between the left pulmonary artery and the descending aorta, has been proposed as a theoretically promising palliative surgical technique to decompress the right ventricle. We report the case of a 12-year-old girl with suprasystemic idiopathic pulmonary hypertension and right ventricular failure who underwent a Potts shunt for palliation with good short-term results. PMID:25705598

  14. CS2104 2003-2004, Semester 1 Assignment 1, CS2104: Train Shunting

    E-print Network

    Bonaventure, Olivier

    . It has a "main" track and two shunt- ing tracks "one" and "two". A situation in the shunting station is called state. A move describes how wagons move from one track to another. main one two Figure 1: Train shunting station. Goal. Our ultimate goal in this assignment is to find a short sequence of moves that turn

  15. New and improved ways to treat hydrocephalus: Pursuit of a smart shunt.

    PubMed

    Lutz, Barry R; Venkataraman, Pranav; Browd, Samuel R

    2013-01-01

    The most common treatment for hydrocephalus is placement of a cerebrospinal fluid shunt to supplement or replace lost drainage capacity. Shunts are life-saving devices but are notorious for high failure rates, difficulty of diagnosing failure, and limited control options. Shunt designs have changed little since their introduction in 1950s, and the few changes introduced have had little to no impact on these long-standing problems. For decades, the community has envisioned a "smart shunt" that could provide advanced control, diagnostics, and communication based on implanted sensors, feedback control, and telemetry. The most emphasized contribution of smart shunts is the potential for advanced control algorithms, such as weaning from shunt dependency and personalized control. With sensor-based control comes the opportunity to provide data to the physician on patient condition and shunt function, perhaps even by a smart phone. An often ignored but highly valuable contribution would be designs that correct the high failure rates of existing shunts. Despite the long history and increasing development activity in the past decade, patients are yet to see a commercialized smart shunt. Most smart shunt development focuses on concepts or on isolated technical features, but successful smart shunt designs will be a balance between technical feasibility, economic viability, and acceptable regulatory risk. Here, we present the status of this effort and a framework for understanding the challenges and opportunities that will guide introduction of smart shunts into patient care. PMID:23653889

  16. Clinical outcome after near-fatal late shunt complication in hydrocephalus

    Microsoft Academic Search

    Ingrid Emanuelson; Lennart von Wendt; Mgtrten Kyllerman; Jerry Larsson

    1994-01-01

    Shunt revision is inevitable in most shunted hydrocephalic children but the revisions rarely affect the prognosis markedly. This report presents the case of an otherwise healthy boy who, after an uneventful gestation and birth, manifested hydrocephalus in the neonatal period and was shunted at the age of 3 months. His subsequent development and school performance were normal until the age

  17. Piezoelectric shunts with a parallel RL circuit for structural damping and vibration control

    Microsoft Academic Search

    Shu-Yau Wu

    1996-01-01

    A study has been made of piezoelectric shunts using a piezoelectric element shunted with a parallel resistor and inductor circuit for passive structural damping and vibration control. It is found that under the optimum tuning condition, the peak amplitude of the displacement versus frequency curve of a structural mode decreases with the increase of the shunt resistance. It becomes a

  18. New and improved ways to treat hydrocephalus: Pursuit of a smart shunt

    PubMed Central

    Lutz, Barry R.; Venkataraman, Pranav; Browd, Samuel R.

    2013-01-01

    The most common treatment for hydrocephalus is placement of a cerebrospinal fluid shunt to supplement or replace lost drainage capacity. Shunts are life-saving devices but are notorious for high failure rates, difficulty of diagnosing failure, and limited control options. Shunt designs have changed little since their introduction in 1950s, and the few changes introduced have had little to no impact on these long-standing problems. For decades, the community has envisioned a “smart shunt” that could provide advanced control, diagnostics, and communication based on implanted sensors, feedback control, and telemetry. The most emphasized contribution of smart shunts is the potential for advanced control algorithms, such as weaning from shunt dependency and personalized control. With sensor-based control comes the opportunity to provide data to the physician on patient condition and shunt function, perhaps even by a smart phone. An often ignored but highly valuable contribution would be designs that correct the high failure rates of existing shunts. Despite the long history and increasing development activity in the past decade, patients are yet to see a commercialized smart shunt. Most smart shunt development focuses on concepts or on isolated technical features, but successful smart shunt designs will be a balance between technical feasibility, economic viability, and acceptable regulatory risk. Here, we present the status of this effort and a framework for understanding the challenges and opportunities that will guide introduction of smart shunts into patient care. PMID:23653889

  19. Acute ventriculoperitoneal shunt malfunction following opening of the spinal subarachnoid space

    Microsoft Academic Search

    Matthew D. Smyth

    2009-01-01

    Tubbs et al. present a case series of five patients who experienced ventriculoperitoneal shunt malfunction with intraspinal subarachnoid surgical manipulation implicated as the pivotal factor in conversion of a stable, suboptimally functioning, cerebrospinal fluid (CSF) shunt system into an acutely obstructed one. They conjecture a “siphoning” effect in the subarachnoid cranial–spinal subarachnoid space as causative in proximal shunt obstruction; a

  20. A Retrospective Analysis of Ventriculoperitoneal Shunt Revision Cases of a Single Institute

    PubMed Central

    Park, Man-Kyu; Kim, Myungsoo; Park, Ki-Su; Park, Seong-Hyun; Hwang, Jeong-Hyun

    2015-01-01

    Objective Ventriculoperitoneal (VP) shunt complication is a major obstacle in the management of hydrocephalus. To study the differences of VP shunt complications between children and adults, we analyzed shunt revision surgery performed at our hospital during the past 10 years. Methods Patients who had undergone shunt revision surgery from January 2001 to December 2010 were evaluated retrospectively by chart review about age distribution, etiology of hydrocephalus, and causes of revision. Patients were grouped into below and above 20 years old. Results Among 528 cases of VP shunt surgery performed in our hospital over 10 years, 146 (27.7%) were revision surgery. Infection and obstruction were the most common causes of revision. Fifty-one patients were operated on within 1 month after original VP shunt surgery. Thirty-six of 46 infection cases were operated before 6 months after the initial VP shunt. Incidence of shunt catheter fracture was higher in younger patients compared to older. Two of 8 fractured catheters in the younger group were due to calcification and degradation of shunt catheters with fibrous adhesion to surrounding tissue. Conclusion The complications of VP shunts were different between children and adults. The incidence of shunt catheter fracture was higher in younger patients. Degradation of shunt catheter associated with surrounding tissue calcification could be one of the reasons of the difference in facture rates. PMID:26113963

  1. Optimization of electric shunt resonant circuits for electroacoustic absorbers

    E-print Network

    Paris-Sud XI, Université de

    Optimization of electric shunt resonant circuits for electroacoustic absorbers H. Lissek, R issue is to properly design an electrical matching circuit which, when connected across the transducer as an absorber/reflector of sound, and the electric terminals of which are connected to a dedicated electric load

  2. Focally spared area of fatty liver caused by arterioportal shunt

    SciTech Connect

    Arita, Takeshi; Matsunaga, Naofumi [Yamaguchi Univ. School of Medicine (Japan)] [Yamaguchi Univ. School of Medicine (Japan); Honma, Yutaka [Shimonoseki City Hospital, Yamaguchi (Japan)] [and others] [Shimonoseki City Hospital, Yamaguchi (Japan); and others

    1996-05-01

    We describe a case with a focally spared area in fatty liver caused by arterioportal shunt. Furthermore, we discuss the cause of the focally spared area related to a localized dilution or reduction in portal blood flow. 13 refs., 1 fig.

  3. Intraluminal 192Ir brachytherapy following transjugular intrahepatic portosystemic shunt revision

    Microsoft Academic Search

    B. Pokrajac; M. Cejna; J. Kettenbach; S. Schamp; C. Fellner; W. Seitz; J. Lammer; R. Poetter

    2001-01-01

    Purpose: The stenosis or occlusion of transjugular intrahepatic portosystemic shunt (TIPS) occurs in up to 75% of patients within 12 months after treatment. The aim of our investigation was to evaluate the feasibility, safety and efficacy of intraluminal high-dose rate brachytherapy (HDRBT) with Iridium-192 following TIPS revision to prevent restenosis due to pseudointimal hyperplasia. Materials and methods: Between September and

  4. Sudden Deafness and Right-to-Left Shunts

    Microsoft Academic Search

    Yasuyuki Iguchi; Kazumi Kimura; Kazuto Kobayashi; Toshihiro Tachi; Teruhito Aihara; Tamotsu Harada

    2008-01-01

    Purpose: One of the etiologies for idiopathic sudden deafness is considered to be ischemia of the inner ear. Cryptogenic stroke is caused by a right-to-left shunt (RLS). The present study investigated whether RLS is associated with the occurrence of sudden deafness. Methods: Contrast saline transcranial Doppler ultrasonography was performed to detect RLS. Subjects comprised 23 consecutive sudden deafness patients and

  5. Simplified model predictive control for a shunt active power filter

    Microsoft Academic Search

    Wang Xiao-gang; Xie Yun-xiang; Shuai Ding-xin

    2008-01-01

    This paper presents a simplified model predictive control (MPC) method for a shunt active power filter. The difference equation is accepted as predictive model, feedback correction and dynamic optimization in conventional MPC are reserved, and the optimal control law is deduced. A comparison between predictive current control and the proposed controller is made; a conclusion that predictive current control with

  6. PROOF-MASS INERTIAL VIBRATION CONTROL USING A SHUNTED

    E-print Network

    Fleming, Andrew J.

    PROOF-MASS INERTIAL VIBRATION CONTROL USING A SHUNTED ELECTROMAGNETIC TRANSDUCER Andrew J. Fleming-mass dampers utilize a suspended mass to reduce the vibration experienced by a host structure. Active vibration vibration absorbtion. An electrical impedance is designed and connected to an electromagnetic coil

  7. Microvascular Arteriovenous Shunting is a Probable Pathogenetic Mechanism in Erythromelalgia

    Microsoft Academic Search

    Cato Mørk; Claes L. Asker; E. Goran Salerud; Knut Kvernebo

    2000-01-01

    Erythromelalgia is a condition consisting of red, warm, and burning painful extremities. Symptoms are relieved by cold and aggravated by heat. A wide variety of etiologic conditions can cause erythromelalgia, but one common pathogenetic mechanism, microvascular arteriovenous shunting, has been hypothesized. The aim of this study was to test this hypothesis. Quantification of skin microvascular perfusion using laser Doppler perfusion

  8. A DC to 100 GHz high performance ohmic shunt switch

    Microsoft Academic Search

    D. Mercier; Pierre Louis Charvet; P. Berruyer; C. Zanchi; Luc Lapierre; Olivier Vendier; Jean Louis Cazaux; Pierre Blondy

    2004-01-01

    This paper presents a wideband ohmic shunt switch implemented on a coplanar waveguide (CPW). The switch is fabricated using a dielectric membrane with patterned metallic contacts that short the CPW line when it is electrostatically actuated. The switch has been extrapolated from measurements. It exhibits low insertion loss, good matching, high isolation from DC to W band (>20 dB up

  9. An adaptive feedback linearizing controller for a shunt DC motor

    Microsoft Academic Search

    J. C. Tafur Sotelo; M. Velez-Reyes

    2002-01-01

    This paper presents the design and implementation of an adaptive feedback: linearizing controller for a shunt DC motor. Experimental evaluation of the proposed scheme is presented. A nonlinear observer for load torque with linear error dynamics is developed. Experimental results illustrate that good performance is obtained when the system operates outside amplifier saturation. The adaptive approach adds robustness to the

  10. Integrated fuel cell stack shunt current prevention arrangement

    Microsoft Academic Search

    R. P. Roche; M. P. Nowak

    1992-01-01

    This patent describes a fuel cell stack with shunt current barriers at a periphery thereof. It comprises fuel cells juxtaposed with one another in the stack and each including a pair of plate-shaped anode and cathode electrodes facing one another and each having a circumferentially complete outer peripheral region consisting of respective marginal portions, and a quantity of liquid electrolyte

  11. Analysis of prognostic variables in the prediction of mortality, shunt failure, variceal rebleeding and encephalopathy following the transjugular intrahepatic protosystemic stent-shunt for variceal haemorrhage

    Microsoft Academic Search

    Rajiv Jalan; Robert A. Elton; Doris N. Redhead; Niall D. C. Finlayson; Hayes Peter C

    1995-01-01

    Background\\/Aims: The aim of this study was to analyse prognostic variables predicting mortality, shunt insufficiency, variceal rebleeding and encephalopathy following transjugular intrahepatic portosystemic stent-shunt for variceal haemorrhage.Methods: Sixty-eight patients with cirrhosis who successfully underwent transjugular intrahepatic portosystemic stent-shunt for variceal haemorrhage were studied. Mean age was 54.8 years (s.e. 1.5); 41 were males and 27 were females. Mean Child score

  12. A case of antiphospholipid antibody syndrome diagnosed after thrombosis of an arteriovenous shunt.

    PubMed

    Naito, T; Yorioka, N; Kyuden, Y; Yamashita, K; Ueda, C; Usui, K; Shigemoto, K; Harada, S; Yamakido, M

    1999-08-01

    A 32-year-old male dialysis patient with lupus nephritis was admitted because of shunt obstruction. The arteriovenous fistula was reconstructed, but obstruction recurred twice within several hours after surgery. A high blood level of anticardiolipin beta2-glycoprotein I antibody suggested that shunt obstruction was caused by a thrombotic tendency related to the antiphospholipid antibody syndrome. Accordingly, for the third shunt procedure, antiplatelet therapy (which had been commenced for systemic lupus erythematosus) was combined with dalteparin sodium from before surgery and warfarin was added postoperatively. This regimen prevented shunt obstruction. In conclusion, hemodialysis patients who suffer repeated shunt obstruction should be examined for antiphospholipid antibody syndrome. PMID:10533910

  13. Spatially Resolved Electroluminescence Imaging of Shunt Sources in Crystalline Silicon Solar Cells

    NASA Astrophysics Data System (ADS)

    Sugimura, Emi; Takamoto, Sohichiroh; Tsujii, Shinichiro; Hirata, Kenji; Tani, Ayumi; Fuyuki, Takashi

    2012-10-01

    Electroluminescence (EL) under forward bias represents the total excess minority carrier density in cells. In contrast, EL under reverse bias can be detected as hot spots, which are closely related to harmful current shunt paths. In this study, we detected the shunt position using two kinds of EL. Additionally, we analyzed by the positions and origins of shunt sources using electron-beam-induced-current, lock-in thermography, and an electron-probe-micro analyser. We found two kinds of shunt and we detected a defect located in the depletion layer. We proposed shunt models in the depletion layer using the band model.

  14. Shunt implantations and peritoneal catheters: Do not cut beyond 20 cm

    PubMed Central

    Maset, Angelo Luiz; Suriano, ?talo Capraro; Monteiro, Ruy; Pinto, José Ricardo Camilo; de Andrade, José Ricardo; Mancini, Bruna Monieli; Ramin, Sérgio Luiz; Moraes, Dionei Freitas; Cavalheiro, Sérgio

    2014-01-01

    Background: Ventriculoperitoneal shunts are supplied with long peritoneal catheters, most commonly between 80 and 120 cm long. ISO/DIS 7197/2006[15] shunt manufacturing procedures include peritoneal catheter as an integrate of the total resistance. Cutting pieces of peritoneal catheters upon shunt implantation or revision is a common procedure. Methods: We evaluated five shunts assembled with different total pressure resistances and variable peritoneal catheter lengths in order to clarify the changes that occurred in the hydrodynamic profile when peritoneal catheters were cut upon shunt implantation or shunt revision. Results: Originally, all shunts performed within the operational range. Shunt 1 performed in a lower pressure range at 200 mm cut off peritoneal catheter and as a low-pressure shunt with –300 mm cut off. Shunt 2 was manufactured to run at the higher border pressure range, and it went out of specification with a 300 mm cut off. Shunt 3 was manufactured to run close to the lower border pressure range, and at 100 mm cutoff, it was already borderline in a lower resistive category. Other shunts also responded similarly. Conclusion: The limit to maintain a shunt in its original pressure settings was 20 cm peritoneal catheter cutting length. By cutting longer pieces of peritoneal catheter, one would submit patients to a less-resistive regimen than intended and his reasoning will be compromised. The pediatric population is more prone to suffer from the consequences of cutting catheters. Shunt manufacturers should consider adopting peritoneal catheters according to the age (height) of the patient. PMID:25250184

  15. 94 5 Metrics on Normed Structures lp-metric

    E-print Network

    Fitelson, Branden

    system by the formula x, y = n i=1 xiyi. In a standard coordinate system #12;5 Metrics on Normed94 5 Metrics on Normed Structures · lp-metric The lp-metric dlp , 1 p , is a norm metric on Rn p . For p = , we obtain ||x|| = limp p n i=1 |xi|p = max1in |xi|. The metric space (Rn , dlp

  16. Immunochemical quantification of human plasma Lp(a) lipoprotein

    Microsoft Academic Search

    John J. Albers; William R. Hazzard

    1974-01-01

    The Lp(a) lipoprotein was purified from human plasma by ultracentrifugation and gel filtration on 6% agarose. It contained\\u000a 27% protein, 65% lipid, and 8% carbohydrate. Quantification of the Lp(a) lipoprotein was performed by radial immunodiffusion.\\u000a Both within-assay and between-assay coefficients of variation were inversely concentration dependent, decreasing from 20%\\u000a and 27%, respectively, at 3 mg\\/100 ml to 7% and 12%,

  17. LP as a Global Search Heuristic Across Different Constrainedness Regions

    Microsoft Academic Search

    Lucian Leahu; Carla P. Gomes

    2005-01-01

    \\u000a Recent years have witnessed the emergence of a new area involving hybrid solvers integrating CP- and OR-based methods. The\\u000a LP relaxation provides bounds on overall solution quality and can be used for pruning in a branch-and-bound approach, especially\\u000a in domains where we have a combination of linear constraints, well-suited for linear programming (LP) formulations, and discrete\\u000a constraints, suited for constraint

  18. Smell of Danger: An Analysis of LP-Gas Odorization

    Microsoft Academic Search

    WILLIAM S. CAIN; AMOS TURK

    1985-01-01

    LP-gas derives warning properties from the odorants ethyl mercaptan or thiophane. Laboratory tests have implied that the average person has the ability to smell the odors before leaking LP-gas reaches one-fifth its lower limit of flammability. Generally, however, laboratory tests ignore or discard persons with a poor sense of smell, especially the elderly and persons with certain types of hyposmia.

  19. The Emory prospective randomized trial: selective versus nonselective shunt to control variceal bleeding. Ten year follow-up.

    PubMed Central

    Millikan, W J; Warren, W D; Henderson, J M; Smith, R B; Salam, A A; Galambos, J T; Kutner, M H; Keen, J H

    1985-01-01

    From 1971 to 1975, 55 patients with variceal bleeding secondary to cirrhosis were entered into a prospective randomized trial comparing distal splenorenal (selective) and H-graft interposition (nonselective) shunt. This 10-year follow-up documents that selective shunt is better (p less than 0.05) in four of the five variables monitored. Control of bleeding: selective shunt prevented variceal bleeding better than interposition shunt due to the higher (0.05 less than p less than 0.1) occlusion rate (30%) of interposition shunt. Selective shunt maintained postoperative portal perfusion better (p less than 0.01) than patent interposition shunt. Seventy-five per cent of selective shunt survivors have portal perfusion at 10 years: no patient with a patent nonselective shunt perfuses the liver. Quantitative liver function was better preserved (p less than 0.01) 10 years after selective shunt than nonselective shunt. Postoperative encephalopathy occurred in fewer (p less than 0.01) selective (27%) than nonselective (75%) shunt patients over the 10 years. Survival: in the randomized population, the improved survival in the selective shunt subgroup did not reach statistical significance. However, improved survival was confirmed in nonalcoholics. Five of eight nonalcoholics operated with selective shunt are alive at 10 years with patent shunts. No nonalcoholic, of seven total, operated with nonselective shunt survived 10 years with a patent shunt. These data show that selective shunt was superior to nonselective shunt. There was less rebleeding and encephalopathy after distal splenorenal shunt; postoperative portal perfusion and hepatic function were maintained. Images FIG. 4. PMID:3890781

  20. 77 FR 58371 - Allegheny Hydro No. 8, L.P., Allegheny Hydro No. 9, L.P., and U.S. Bank National Association...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-20

    ...Energy Regulatory Commission [Project No. 3021-088] Allegheny Hydro No. 8, L.P., Allegheny Hydro No. 9, L.P., and U.S. Bank National Association Allegheny Hydro, LLC; Notice of Application for Transfer of License, and...

  1. Cholesterol efflux from cells to immunopurified subfractions of human high density lipoprotein: LP-AI and LP-AI\\/AII

    Microsoft Academic Search

    William J. Johnson; Elisabeth P. C. Kilsdonk; Arie van Tol; Michael C. Phillips; George H. Rothblat

    Using immunoaffinity chromatography, we sepa- cells, there is little or no oxidative degradation of rated human high density lipoprotein (HDL) into two subfrac- cholesterol, and sterol homeostasis requires that excess tions: LP-AI, in which all particles contain apolipoprotein A-I cholestero~ be removed and transported to the liver. These (apoA-I) but no apoA-11, and LP-AI\\/AII, in which all particles removal and

  2. Temporary intraoperative porto-caval shunt: useless or beneficial in piggy back liver transplantation?

    PubMed

    Pratschke, Sebastian; Meimarakis, Georgios; Bruns, Christiane J; Kaspar, Michael; Prix, Niclas; Zachoval, Reinhart; Guba, Markus; Jauch, Karl-Walter; Loehe, Florian; Angele, Martin K

    2013-01-01

    The role of intraoperative porto-caval shunts in orthotopic liver transplantation (OLT) is controversial. Aim of this study was to analyze the effects of an intraoperative, porto-caval catheter-shunt on graft function and survival following cava sparing OLT. Four hundred and forty-eight piggy back liver transplantations with or without a temporary spontaneous porto-caval shunt between 1997 and 2010 were analyzed (shunt n = 274 vs. no shunt n = 174). Lab MELD scores and donor risk indices (DRI) were calculated. Hepatic injury (ALT, AST), -function (bilirubin, prothrombin ratio), postreperfusion liver blood flow and graft survival were registered [mean follow-up: 50.5 (0-163.0) months]. The impact of a shunt on graft survival was determined using multivariate analysis. Usage of a porto-caval shunt was associated with reduced hepatic injury (ALT, AST), whereas graft function was not affected. The shunt group showed a significantly increased portal venous blood flow after reperfusion. Retransplantation rate was decreased (7.7% vs. 20.1%, P = 0.001) and long-term graft survival was significantly increased with a porto-caval shunt (hazard ratio 2.1, P < 0.001). This effect was even more pronounced for marginal organs. Usage of intraoperative porto-caval catheter-shunts is beneficial in cava sparing OLT and is associated with reduced ischemia-reperfusion injury and improved organ survival in particular for recipients of marginal organs. PMID:23237579

  3. Assessment of surgical portosystemic shunts and associated complications: The diagnostic and therapeutic role of radiologists.

    PubMed

    Taslakian, Bedros; Faraj, Walid; Khalife, Mohammad; Al-Kutoubi, Aghiad; El-Merhi, Fadi; Saade, Charbel; Hallal, Ali; Haydar, Ali

    2015-08-01

    Surgical portosystemic shunting, the formation of a vascular connection between the portal and systemic venous circulation, has been used as a treatment to reduce portal venous pressure. Although the use of portosystemic shunt surgery in the management of portal hypertension has declined during the past decade in favour of alternative therapies, and subsequently surgeons and radiologists became less familiar with the procedure, it remains a well-established treatment. Knowledge of different types of surgical portosystemic shunts, their pathophysiology and complications will help radiologists improve communication with surgeons and enhance their understanding of the diagnostic and therapeutic role of radiology in the assessment and management of these shunts. Optimal assessment of the shunt is essential to determine its patency and allow timely intervention. Both non-invasive and invasive imaging modalities complement each other in the evaluation of surgical portosystemic shunts. Interventional radiology plays an important role in the management of complications, such as shunt thrombosis and stenosis. This article describes the various types of surgical portosystemic shunts, explains the anatomy and pathophysiology of these shunts, illustrates the pearls and pitfalls of different imaging modalities in the assessment of these shunts and demonstrates the role of radiologists in the interventional management of complications. PMID:25963504

  4. Neurodevelopmental Outcome of Extremely Low Birth Weight Infants With Posthemorrhagic Hydrocephalus Requiring Shunt Insertion

    PubMed Central

    Adams-Chapman, Ira; Hansen, Nellie I.; Stoll, Barbara J.; Higgins, Rose

    2009-01-01

    OBJECTIVE We aimed to evaluate neurodevelopmental and growth outcomes among extremely low birth weight infants who had severe intraventricular hemorrhage that required shunt insertion compared with infants without shunt insertion. METHODS Infants who were born in 1993–2002 with birth weights of 401 to 1000 g were enrolled in a very low birth weight registry at medical centers that participate in the National Institute of Child Health and Human Development Neonatal Research Network, and returned for follow-up at 18 to 22 months’ corrected age were studied. Eighty-two percent of survivors completed follow-up, and 6161 children were classified into 5 groups: group 1, no intraventricular hemorrhage/no shunt (n = 5163); group 2, intraventricular hemorrhage grade 3/no shunt (n = 459); group 3, intraventricular hemorrhage grade 3/shunt (n = 103); group 4, intraventricular hemorrhage grade 4/no shunt (n = 311); and group 5, intraventricular hemorrhage grade 4/shunt (n = 125). Group comparisons were evaluated with ?2 and Wilcoxon tests, and regression models were used to compare outcomes after adjustment for covariates. RESULTS Children with severe intraventricular hemorrhage and shunts had significantly lower scores on the Bayley Scales of Infant Development IIR compared with children with no intraventricular hemorrhage and with children with intraventricular hemorrhage of the same grade and no shunt. Infants with shunts were at increased risk for cerebral palsy and head circumference at the <10th percentile at 18 months’ adjusted age. Greatest differences were observed between children with shunts and those with no intraventricular hemorrhage on these outcomes. CONCLUSIONS This large cohort study suggests that extremely low birth weight children with severe intraventricular hemorrhage that requires shunt insertion are at greatest risk for adverse neurodevelopmental and growth outcomes at 18 to 22 months compared with children with and without severe intraventricular hemorrhage and with no shunt. Long-term follow-up is needed to determine whether adverse outcomes persist or improve over time. PMID:18390958

  5. Exploration of nonlinear shunting strategies as effective vibration absorbers

    NASA Astrophysics Data System (ADS)

    Viguié, R.; Kerschen, G.; Ruzzene, M.

    2009-03-01

    The tuned mass damper (TMD) is a simple and efficient device, but it is only effective when it is precisely tuned to the frequency of a particular vibration mode. In order to overcome this limitation, the nonlinear energy pumping phenomenon from a main mechanical structure to a local, passive nonlinear energy sink (NES) is investigated. Unlike the TMD, an NES has no preferential resonant frequency, which makes it a good candidate for vibration mitigation of MDOF linear and nonlinear vibrating structures. However, in addition to the rattle space requirements, the mechanical implementation of the nonlinear absorber poses serious challenges. This is why piezoelectric shunting is considered in this study. Specifically, the objective of the paper consists in developing a suitable association of piezoelectric patches and nonlinear shunted electrical circuits so that the effects of the NES would be electrically reproduced.

  6. Modernisation Issues of Diesel-Electric Shunting Locomotive Power Units

    NASA Astrophysics Data System (ADS)

    Hoimoja, Hardi; Jalakas, Tanel; Rosin, Argo; Rassylkin, Anton

    2010-01-01

    The research concentrates on the modernisation issues of inefficient diesel-electric shunting locomotives, produced in the former Soviet Union. The existing diesel-generator unit, serving as an onboard power plant can be replaced by hybridised units, with an energy storage unit acting as a peaking power source for dynamic modes. By integrating an energy storage unit into the power plant, the locomotive traction drive becomes hybridised, consuming less fuel during transients and idling.

  7. High-isolation CPW MEMS shunt switches. 1. Modeling

    Microsoft Academic Search

    Jeremy B. Muldavin; Gabriel M. Rebeiz

    2000-01-01

    This paper, the first of two parts, presents an electromagnetic model for membrane microelectromechanical systems (MEMS) shunt switches for microwave\\/millimeter-wave applications. The up-state capacitance can be accurately modeled using three-dimensional static solvers, and full-wave solvers are used to predict the current distribution and inductance of the switch. The loss in the up-state position is equivalent to the coplanar waveguide line

  8. High Isolation CPW MEMS Shunt Switches Part 1: Modeling

    Microsoft Academic Search

    Jeremy B. Muldavin; Gabriel M. Rebeiz

    1999-01-01

    This paper, the first of two parts, presents an electromagnetic model for membrane CPW MEMS shunt switches for microwave\\/mm-wave applications. The up- state capacitance can be accurately modeled using 3-D static solvers, and full-wave solvers are used to predict the current distribution and the inductance of the switch. The loss in the up-state position is equivalent to the CPW line

  9. Extremely rare complications in cerebrospinal fluid shunt operations.

    PubMed

    Surchev, J; Georgiev, K; Enchev, Y; Avramov, R

    2002-06-01

    The cerebrospinal fluid shunt operation, from its first realization in 1908 by Kausch till our days, is still of a significant importance for the long-term treatment of the internal hydrocephalus. Well known are many complications connected with the use of the valve systems (malfunction, infectious, overdrainage, secondary craniosynostosis and etc.). For a period of 17 years (1984-2000) at the Clinic of Pediatric Neurosurgery, Department of Neurosurgery, Sofia Medical University, 414 cerebrospinal fluid shunt operations were performed on children. 216 were drained to the right atrium of the heart, 198 to the peritoneal cavity. They were followed up by catamnesis until the year 2001. The authors describe 2 extremely rare cases with post-shunt complication as a result of a malfunction of the valve system, owing to a migration of the distal catheter: 1) in the anus; 2) in the urethra. In the first case the distal catheter perforated the colon transversum and by the way of the intestines went out through the anus. In the second case the distal catheter protruded out of the body through the bladder and the urethra. Their clinical appearance, the diagnostic examinations and the operative treatment are shown. PMID:12232559

  10. Turbomachinery blades damping thanks to optimized shunted piezoelectric circuits

    NASA Astrophysics Data System (ADS)

    Livet, S.; Collet, M.; Berthillier, M.; Jean, P.; Cote, J. M.

    2008-03-01

    Dynamics of gas-turbine blades are particularly aero-elastic coupling sensitive. These aerodynamic limits can be pushed away by adding extra damping to the structure in order to reach even better compressor performance. However nowadays design and manufacturing techniques in aero-mechanics are achieving their maximum of state-of-the-art. As in many fields active control would solve easily this kind of instability. But the diffculty remains in the needed energy supply for actuators whereas these components are aimed to be bonded on rotating structures. The capacity of different auto-supplied devices using shunted piezoelectric circuits had been studied here to prevent turbomachine bladed from fluttering. Before realizing the study on complex turbomachine geometries, the presented technique uses a numerical development thanks to a 1D Euler-Bernoulli beam model combining both mechanical and electrical coupling parameters. A second development thanks to a 3D model had been made using a commercial tool, Comsol software. These approximate models are used to optimize electrically the shunted piezoelectric element and its localization. The results, verified experimentally, let suppose that vibrations can be reduced signiffcantly when shunted piezoelectric circuits are mounted on a real structure.

  11. Post Blalock-Taussig shunt mediastinal mass - a single shadow with two different destinies.

    PubMed

    Rohit, Manoj Kumar; Vadivelu, Ramalingam; Khandelwal, Niranjan; Krishna, Satheesh

    2014-01-01

    The modified Blalock-Taussig shunt is a synthetic shunt between the subclavian and pulmonary artery, used in the treatment of congenital cyanotic heart diseases with pulmonary hypoperfusion. Delayed complications include progressive failure of the shunt, serous fluid leak, and pseudoaneurysm formation. We report two different and rare mediastinal vascular complications following modified BT shunt surgery in this case report. The first one is a seroma, due to serous fluid leakage through the shunt graft, which is a relatively benign complication. The second one is a pseudoaneurysm, arising from the shunt, a frequently fatal complication. Generally, X-ray chest is used for screening in these patients. CT angiography plays a vital role in the diagnosis of both these conditions. Management in pseudoaneurysm should be aggressive, as timely intervention may be life saving, while in seroma the management is most often conservative occasionally requiring surgical intervention. PMID:24814123

  12. Causative role of infection in chronic non-thromboembolic pulmonary hypertension following ventriculo-atrial shunt.

    PubMed

    Amelot, Aymeric; Bouazza, Schaharazad; George, Bernard; Bresson, Damien

    2014-08-01

    A severe complication of ventriculo-atrial (VA) shunt placement for treatment of hydrocephalus is chronic thromboembolic pulmonary hypertension (CTEPH). We report here a patient with a VA shunt for treatment of hydrocephalus who presented two consecutive episodes of VA shunt-induced infection by Staphylococcus epidermidis and who rapidly developed chronic PH. Extensive radiological investigations and normal ventilation/perfusion lung scan allowed us to rule out CTEPH. To our knowledge, no other case of chronic pulmonary hypertension (PH) related to VA shunt insertion has been reported so far. PH in this patient with VA shunt is clinically distinct from CTEPH and has been caused by VA shunt-induced S. epidermidis infection per se. PMID:24175581

  13. Ascending transaqueductal cystoventriculoperitoneal shunting in Dandy-Walker malformation: technical note.

    PubMed

    Unal, Omer Faruk; Aras, Yavuz; Aydoseli, Aydin; Akcakaya, Mehmet Osman

    2012-01-01

    The optimal treatment for Dandy-Walker malformation is still controversial. Ventriculoperitoneal shunting, cystoperitoneal shunting or combinations are the most common surgical options in the management of this clinical entity. Endoscopic procedures like ventriculocystostomy, 3rd ventriculostomy or endoscopy-assisted shunt surgeries have become the focus of recent publications. We describe a new transcystic endoscopic technique, with the usage of a single ascending transaqueductal shunt catheter with additional holes, whereby both the posterior fossa cyst and supratentorial ventricular compartments are drained effectively. By using this new technique complications associated with combined shunting can be avoided. In addition, by equalizing the pressure within the supra- and infratentorial compartments, the upward or downward herniations associated with single-catheter shunting can be prevented. PMID:23941970

  14. Reversibility of intrapulmonary arteriovenous shunts in liver cirrhosis documented by serial radionuclide perfusion lung scans

    SciTech Connect

    Chen, N.S.; Barnett, C.A.; Farrer, P.A.

    1984-05-01

    Using serial perfusion lung scans, the opening up and closure of right-to-left intrapulmonary arteriovenous shunts has been documented over a period of several weeks in a patient with chronic alcoholic liver disease. The presence of the shunts correlates well with the severity of hypoxemia and the presence of nodular mottling on chest radiographs. The time course of these changes with clinical status suggests lability and the functional nature of these shunts.

  15. Exclusion of infected pseudoaneurysm of modified Blalock Taussig shunt using a covered stent.

    PubMed

    Srivastava, Anurakti; Radha, Anil Sivadasan

    2012-05-01

    A pseudoaneurysm due to infection after a modified Blalock-Taussig shunt is a rare but potentially fatal complication that can rupture, compress mediastinal structures, produce shunt occlusion, and bacteremia. In these patients, medical management of endocarditis is often incomplete because of the presence of prosthetic material and requires the take down of the shunt, most often by surgery, which can be technically challenging. We outline the use of a covered stent to exclude pseudoaneurysm from circulation. PMID:22562929

  16. 1. RN p R 1 p g1,...,gN Lp()

    E-print Network

    Ishii, Hitoshi

    22080119 : 1. RN p R 1 p W1,p() W1,p() = u Lp() ; g1,...,gN Lp() u xi dx = - gidx for C c () i = 1,...,N u W1,p() u xi = gi u = grad u = ( u x1 ,..., u xN ) W1,p() u W1,p()= u Lp() + N i=1 u xi Lp() ( ( u p Lp() +N i=1 u xi p Lp() ) 1 p ) 1 = B1 = {x R2 ; |x| 1} , p = 1 u

  17. Cellophane banding of congenital intrahepatic portosystemic shunts in two Irish wolfhounds.

    PubMed

    Connery, N A; McAllister, H; Skelly, C; Pawson, P; Bellenger, C R

    2002-08-01

    Two three-month-old, male Irish wolfhound siblings were diagnosed with breed-typical left divisional congenital intrahepatic portosystemic shunts consistent with patent ductus venosus. The shunts were amenable to surgical dissection at a posthepatic location. Both dogs had cellophane banding for shunt attenuation. One dog was euthanased after developing post-ligation neurological dysfunction, which was refractory to treatment. The other dog survived and demonstrated shunt attenuation. Successful surgical management using cellophane banding of a patent ductus venosus has not been previously described in a large-breed dog. PMID:12201443

  18. Embolization of portal-systemic shunts in cirrhotic patients with chronic recurrent hepatic encephalopathy

    SciTech Connect

    Sakurabayashi, Shin; Sezai, Shuichi; Yamamoto, Yoshihiro; Hirano, Masanori; Oka, Hiroshi [Tokyo Metropolitan Police Hospital, Division of Gastroenterology (Japan)

    1997-03-15

    Purpose. To evaluate the efficacy of embolization of portal-systemic shunts in cirrhotic patients with chronic recurrent hepatic encephalopathy (CRHE). Methods. Seven cirrhotic patients with CRHE refractory to medical treatment (3 men and 4 women, mean age 66 years) were studied. Five patients had splenorenal shunts, 1 had a gastrorenal shunt, and 1 had an intrahepatic portal vein-hepatic vein shunt. Shunt embolization was performed using stainless steel coils, with a percutaneous transhepatic portal vein approach in 4 patients and a transrenal vein approach in 3 patients. Results. After embolization, the shunt disappeared in 4 patients on either ultrasound pulsed Doppler monitoring or portography. Complications observed in the 7 patients were fever, transient pleural effusion, ascites, and mild esophageal varices. For 3-6 months after embolization, the 4 patients whose shunts disappeared showed minimal or no reappearance of a shunt, and had no recurrence of encephalopathy. The serum ammonia levels decreased and electroencephalograms also improved. One of the 4 patients, who developed mild esophageal varices, required no treatment. Treatment was effective in 3 of the 4 patients (75%) who underwent embolization via a transhepatic portal vein. Conclusion. Transvascular embolization of shunts improved the outcome in 4 of 7 patients. The most effective embolization was achieved via the percutaneous transhepatic portal vein approach.

  19. Stent graft closure of a high flow splenorenal shunt after liver transplantation.

    PubMed

    Litvin, Sergey; Atar, Eli; Knizhnik, Michael; Bruckheimer, Elchanan; Belenky, Alexander

    2010-12-01

    We describe a patient after liver transplantation with a preexisting surgical splenorenal shunt close to the confluence of the splenic and superior mesenteric veins and a wide, short communication between the splenic and renal veins. To close the shunt, an inferior vena cava filter was inserted in the shunt and a vascular plug was placed in the splenic vein inside the filter. When this failed to stop the flow through the shunt, a covered stent was deployed at the superior mesenteric vein-portal vein junction. PMID:19784918

  20. 77 FR 50492 - Notice of Petition for Declaratory Order; Shell Pipeline Company LP

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-21

    ...Docket No. OR12-23-000] Notice of Petition for Declaratory Order; Shell Pipeline Company LP Take notice that on August 10, 2012, pursuant to Rule 207(a)(2), Shell Pipeline Company LP submitted a petition requesting that the...

  1. 77 FR 21764 - Shell Pipeline Company LP; Notice of Petition for Declaratory Order

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-11

    ...Energy Regulatory Commission [Docket No. OR12-11-000] Shell Pipeline Company LP; Notice of Petition for Declaratory Order...that on March 30, 2012, pursuant to Rule 207(a)(2), Shell Pipeline Company LP (SPLC) submitted a petition...

  2. 75 FR 13644 - TORP Terminal LP, Bienville Offshore Energy Terminal Liquefied Natural Gas Deepwater Port License...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-22

    ...Administration [USCG-2006-24644] TORP Terminal LP, Bienville Offshore Energy Terminal Liquefied Natural Gas Deepwater Port License...Environmental Impact Statement (FSEIS) for the TORP Terminal LP, Bienville Offshore Energy Terminal...

  3. 77 FR 38128 - Withdrawal of TORP Terminal LP, Bienville Offshore Energy Terminal Liquefied Natural Gas (LNG...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-26

    ...USCG-2006-24644] Withdrawal of TORP Terminal LP, Bienville Offshore Energy Terminal Liquefied Natural Gas (LNG) Deepwater Port...Maritime Administration (MARAD) announces TORP Terminal LP's (TORP) withdrawal of the...

  4. 78 FR 11965 - Agency Information Collection (Learner's Perception (LP) Survey) Activities Under OMB Review

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-20

    ...Information Collection (Learner's Perception (LP) Survey) Activities Under OMB...SUPPLEMENTARY INFORMATION: Title: Learner's Perception (LP) Survey, VA Form 10-0439...be use to obtain health care trainees perception of their clinical experience with...

  5. 77 FR 74280 - Proposed Information Collection (Learner's Perception (LP) Survey); Comment Request

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-13

    ...Information Collection (Learner's Perception (LP) Survey); Comment Request AGENCY...information technology. Title: Learner's Perception (LP) Survey, VA Form 10-0439...be use to obtain health care trainees perception of their clinical experience with...

  6. What is a lumbar puncture? Lumbar puncture (LP), also called a spinal

    E-print Network

    Baloh, Bob

    giving blood. A post-LP headache can also occur. Less than 10% of those receiving an LP report a headache. Such headaches are usually mild and last 0-2 days. More severe headaches can occur in rare instances

  7. 76 FR 81925 - Freeport LNG Development, L.P.; Notice of Application

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-29

    ...Commission [Docket No. CP12-29-000] Freeport LNG Development, L.P.; Notice of Application Take notice that on December 9, 2011, Freeport LNG Development, L.P. (Freeport LNG), filed an application pursuant to Section...

  8. Shunting arc plasma source for pure carbon ion beama)

    NASA Astrophysics Data System (ADS)

    Koguchi, H.; Sakakita, H.; Kiyama, S.; Shimada, T.; Sato, Y.; Hirano, Y.

    2012-02-01

    A plasma source is developed using a coaxial shunting arc plasma gun to extract a pure carbon ion beam. The pure carbon ion beam is a new type of deposition system for diamond and other carbon materials. Our plasma device generates pure carbon plasma from solid-state carbon material without using a hydrocarbon gas such as methane gas, and the plasma does not contain any hydrogen. The ion saturation current of the discharge measured by a double probe is about 0.2 mA/mm2 at the peak of the pulse.

  9. Shunting arc plasma source for pure carbon ion beam.

    PubMed

    Koguchi, H; Sakakita, H; Kiyama, S; Shimada, T; Sato, Y; Hirano, Y

    2012-02-01

    A plasma source is developed using a coaxial shunting arc plasma gun to extract a pure carbon ion beam. The pure carbon ion beam is a new type of deposition system for diamond and other carbon materials. Our plasma device generates pure carbon plasma from solid-state carbon material without using a hydrocarbon gas such as methane gas, and the plasma does not contain any hydrogen. The ion saturation current of the discharge measured by a double probe is about 0.2 mA?mm(2) at the peak of the pulse. PMID:22380206

  10. Piezoelectric vibration damping using resonant shunt circuits: an exact solution

    NASA Astrophysics Data System (ADS)

    Soltani, P.; Kerschen, G.; Tondreau, G.; Deraemaeker, A.

    2014-12-01

    The objective of this paper is to propose an exact closed-form solution to the {{H}? } optimization of piezoelectric materials shunted with inductive-resistive passive electrical circuits. Realizing that Den Hartog?s method which imposes fixed points of equal height in the receptance transfer function is approximate, the parameters of the piezoelectric tuned vibration absorber are calculated through the direct minimization of the maxima of the receptance. The method is applied to a one-degree-of-freedom primary oscillator considering various values of the electromechanical coupling coefficients.

  11. Proteoglycans Contribution to Association of Lp(a) and LDL With Smooth Muscle Cell Extracellular Matrix

    Microsoft Academic Search

    Ulf Lundstam; Eva Hurt-Camejo; Gun Olsson; Peter Sartipy; Germa n Camejo; Olov Wiklund

    2010-01-01

    Abstract—Lp(a) interference with fibrinolysis could contribute to atherothrombosis. Additionally, accumulation of Lp(a) and LDLs, could lead to cholesterol deposition and foam cell formation in atherogenesis. The interactions between Lp(a) and LDL could cause their entrapment,in the extracellular matrix of lesions. We found that association of Lp(a) with matrix secreted by cultured human,arterial smooth,muscle cells increased 2 to 3 times the

  12. Name: dhr. prof. dr. L.P. Regli Neurosurgery

    E-print Network

    Utrecht, Universiteit

    Name: dhr. prof. dr. L.P. Regli Profile Teaching commitment Neurosurgery Faculty Medicine Department Neuroscience / Neurology and Neurosurgery Contact details Telephone (+31) 88 755 7059 E vitae · 2008: Professor & Head of Dept of Neurosurgery, University Medical Center, Utrecht-NL · 2006

  13. Further developments in LP-based optimal power flow

    Microsoft Academic Search

    O. Alsac; J. Bright; M. Prais; B. P Stott

    1990-01-01

    The authors describe developments that have transformed the LP (linear programming) approach into a truly general-purpose OPF (optimal power flow) solver, with computational and other advantages over even recent nonlinear programming (NLP) methods. it is pointed out that the nonseparable loss-minimization problem can now be solved, giving the same results as NLP on power systems of any size and type.

  14. LP engine and fluidized bed gas producer performance

    SciTech Connect

    Lamorey, G.W.; Jenkins, B.M.; Goss, J.R.

    1986-01-01

    Performance data is presented for operation of a fluidized bed gasifier fueling a 75 kW, LP gas engine with almond shell screenings, alfalfa seed straw and screenings, corn and cotton stalks, rice and wheat straw. Gasifier operation was satisfactory. Engine operation was marginal.

  15. Signed Lp-distance Fields Alexander Belyaev a

    E-print Network

    Frey, Pascal

    are supported by numerical experiments which reveal high practical potential of our approach. 1. Introduction potential fields and applied them for shape skele- tonisation and 3D texture modeling, respectively and their corresponding signed Lp- distance fields are easy to analyze; (iv) our generalized double-layer potentials can

  16. Fire Service Training. LP and Compressed Gas Emergencies.

    ERIC Educational Resources Information Center

    North Carolina State Dept. of Community Colleges, Raleigh.

    Part of a series of instructional outlines intended for use in a training program for firemen with no previous formal training, this curriculum guide discusses safety precautions for liquefied petroleum (LP) and compressed gas emergencies. During its twelve hours of instruction it covers (1) terminology; (2) the chemical composition of the gases;…

  17. Lp JOHN ELLIPSOIDS Erwin Lutwak, Deane Yang, and Gaoyong Zhang

    E-print Network

    Zhang, Gaoyong

    Lp JOHN ELLIPSOIDS Erwin Lutwak, Deane Yang, and Gaoyong Zhang Department of Mathematics Polytechnic University Brooklyn, NY 11201 Abstract. It is shown that the classical John ellipsoid, the Petty body K is a unique ellipsoid JK of maximal volume contained in K. The ellipsoid is called the John

  18. Electromagnetic Shunt Damping S. Behrens A. J. Fleming S. O. Reza Moheimani

    E-print Network

    Fleming, Andrew J.

    Electromagnetic Shunt Damping S. Behrens A. J. Fleming S. O. Reza Moheimani School of Electricalqhzfdvwoh1hgx1dx Abstract A method for electromagnetic shunt damping (EMSD) will be presented in this paper. A passive control strategy is validated through experi- mentation on a simple electromagnetic mass

  19. Finite element-based analysis of shunted piezoelectric structures for vibration damping

    Microsoft Academic Search

    Jens Becker; Oliver Fein; Matthias Maess; Lothar Gaul

    2006-01-01

    Piezoelectric patches shunted with passive electrical networks can be attached to a host structure for reduction of structural vibrations. This approach is frequently called “shunted piezo damping” and has the advantage of guaranteed stability and low complexity in implementation. For numerical treatment of such structures, a finite element modelling methodology is presented that incorporates both the piezoelectric coupling effects of

  20. Uniform model for series RL and parallel RL shunt circuits and power consumption

    Microsoft Academic Search

    Chul H. Park; Daniel J. Inman

    1999-01-01

    A simple impedance based analysis is presented for resonant shunt circuits. The formulation is compatible with arrangement of shunt electronics and is used to clarify previously published resonance condition and to examine power. Since our resonance condition is contrary to previously published results, experimental verification is also presented. The experiments consist of both a series and parallel second mode absorber

  1. Interatrial septal mobility predicts larger shunts across patent foramen ovales: An analysis with transmitral Doppler scanning

    Microsoft Academic Search

    Ervin R. Fox; Michael H. Picard; Chi-Ming Chow; Robert A. Levine; Lee Schwamm; Andrew J. Kerr

    2003-01-01

    Background The association of patent foramen ovale (PFO) with cryptogenic stroke is strongest in patients with larger shunts and patients with atrial septal aneurysms (ASAs). We postulated that the potency of ASA as a risk factor for stroke relates to the size of shunt across PFOs associated with mobile atrial septae. The purpose of this study was to investigate the

  2. RAPID COMMUNICATION GABAA-Receptor-Mediated Rebound Burst Firing and Burst Shunting

    E-print Network

    Huguenard, John R.

    RAPID COMMUNICATION GABAA-Receptor-Mediated Rebound Burst Firing and Burst Shunting in Thalamus-receptor-medi- tions between relay and perigeniculate nucleus cells (von ated rebound burst firing and burst shunting rebound burst firing and 2) burst inhibition experiments in vivo (Ahlse´n and Lindstro¨m 1982)inhibition

  3. Rationale and methodology of the multicenter pediatric cerebrospinal sluid shunt design trial

    Microsoft Academic Search

    James M. Drake; John Kestle

    1996-01-01

    Cerebrospinal fluid shunt failure remains a common and at times overwhelming problem in pediatric patients with hydrocephalus. Two new shunt valve designs, the Orbis-Sigma (Cordis Corporation, Miami, Florida) and the Delta valve (PS Medical, Goletta, California), have flow\\/pressure characteristics dramatically different from those of standard differential pressure valves which have been used for over three decades. Both new designs reduce

  4. Shunt currents in vanadium flow batteries: Measurement, modelling and implications for efficiency

    NASA Astrophysics Data System (ADS)

    Fink, H.; Remy, M.

    2015-06-01

    Shunt currents are an important factor which must be considered when designing a stack for flow batteries. They lead to a reduction of the coulombic efficiency and can cause furthermore a critical warming of the electrolyte. Shunt currents inevitably appear at bypass connections of the hydraulic system between the single cells of a stack. In this work the shunt currents of a five-celled mini stack of a vanadium flow battery with external hydraulic system and their effects are investigated directly. The external hydraulic system allows the implementation of current sensors for direct measurement of the shunt currents; moreover, the single bypass channels can be interrupted by clamping the tube couplings and with it the shunt currents between the cells when the pumps are off. Thus the shares of losses by cross contamination and by shunt currents are quantified separately by charge conservation measurements. The experimentally gained data are compared to a shunt current model based on a equivalent circuit diagram and the linear equation system derived from it. Experiments and model data are in good agreement. The effects of shunt currents for different flow frame geometries and number of cells in a stack are simulated and presented in this work.

  5. FPGA-based fully digital controller for three-phase shunt active filters

    Microsoft Academic Search

    S. Karimi; P. Poure; S. Saadate; E. Gholipour

    2008-01-01

    This article presents a fully digital controller for a three-phase shunt active filter. The harmonic isolator and the current controller both have been implemented in only one Field Programmable Gate Array (FPGA). This article discusses the design and implementation of digital hybrid modulated hysteresis current controller and multi-variable filters for shunt active filter controlling. Simulation and experimental results based on

  6. A modification of Winter's shunt in the treatment of pediatric low-flow priapism

    Microsoft Academic Search

    Venkatachalam Raveenthiran

    2008-01-01

    PurposeCavernous shunt operations available for treating priapism are frequently unsuitable for children owing to high chances of persistent venous leak that results in postoperative erectile dysfunction. In this article, a modification of Winter's shunt, which is suitable for treating low-flow priapism in children, is described.

  7. Electromagnetic multi-mode shunt damper for flexible beams based on current flowing circuit

    NASA Astrophysics Data System (ADS)

    Cheng, T. H.; Wang, X. L.; Oh, I. K.

    2009-07-01

    In this paper, the multiple current flowing electromagnetic shunt damper was newly employed for the semi-active vibration suppression of the flexible structures. The electromagnetic shunt damper consists of a coil and a permanent magnet. The ends of the coil were connected to the multimode current flowing electromagnetic shunt circuit for vibration reduction of the cantilever beam employing energy dispersion method. The system was electro-magneto-mechanically coupled between the electrical circuit and mechanical vibrating cantilever beam with a electromagnetic transducer. The circuits were designed for first two mode control of the cantilever. The vibration and damping characteristics of the flexible beams with the electromagnetic shunt damper were investigated by tuning the circuit parameters. The effect of the magnetic intensity on the shunt damping was studied with the variation of the gap between the aluminum beam and the permanent magnet. The resistances of the shunt circuit were used to investigate vibration damping effect of cantilever. The theoretical prediction of frequency response of the beam under multiple mode electromagnetic shunt damping method has a good agreement with experimental results. Present results show that the magnet shunt damper can be successfully applied to reduce the vibration of the flexible structures.

  8. 29 CFR 1926.153 - Liquefied petroleum gas (LP-Gas).

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 2014-07-01 false Liquefied petroleum gas (LP-Gas). 1926.153 Section...Prevention § 1926.153 Liquefied petroleum gas (LP-Gas). (a) Approval of...for transportation or storing liquefied petroleum gases. (b) Welding on LP-Gas...

  9. 29 CFR 1926.153 - Liquefied petroleum gas (LP-Gas).

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 2013-07-01 false Liquefied petroleum gas (LP-Gas). 1926.153 Section...Prevention § 1926.153 Liquefied petroleum gas (LP-Gas). (a) Approval of...for transportation or storing liquefied petroleum gases. (b) Welding on LP-Gas...

  10. 29 CFR 1926.153 - Liquefied petroleum gas (LP-Gas).

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... 2011-07-01 false Liquefied petroleum gas (LP-Gas). 1926.153 Section...Prevention § 1926.153 Liquefied petroleum gas (LP-Gas). (a) Approval of...for transportation or storing liquefied petroleum gases. (b) Welding on LP-Gas...

  11. 29 CFR 1926.153 - Liquefied petroleum gas (LP-Gas).

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 2012-07-01 false Liquefied petroleum gas (LP-Gas). 1926.153 Section...Prevention § 1926.153 Liquefied petroleum gas (LP-Gas). (a) Approval of...for transportation or storing liquefied petroleum gases. (b) Welding on LP-Gas...

  12. Note on Implementing the New IPM for LP Without Matrix Inversions

    E-print Network

    Murty, Katta G.

    Note on Implementing the New IPM for LP Without Matrix Inversions Katta G. Murty Department: Linear programming (LP), interior point methods (IPMs), solving LPs without matrix inversions. 1 Introduction In [9, 10] a new predictor-corrector type interior point method (IPM) for linear programming (LP

  13. Prevention of Arteriovenous Shunt Occlusion Using Microbubble and Ultrasound Mediated Thromboprophylaxis

    PubMed Central

    Kutty, Shelby; Wu, Juefei; Hammel, James M.; Abraham, Joseph R.; Venkataraman, Jeeva; Abdullah, Ibrahim; Danford, David A.; Radio, Stanley J.; Lof, John; Porter, Thomas R.

    2014-01-01

    Background Palliative shunts in congenital heart disease patients are vulnerable to thrombotic occlusion. High mechanical index (MI) impulses from a modified diagnostic ultrasound (US) transducer during a systemic microbubble (MB) infusion have been used to dissolve intravascular thrombi without anticoagulation, and we sought to determine whether this technique could be used prophylactically to reduce thrombus burden and prevent occlusion of surgically placed extracardiac shunts. Methods and Results Heparin?bonded ePTFE tubular vascular shunts of 4 mm×2.5 cm (Propaten; W.L Gore) were surgically placed in 18 pigs: a right?sided side?to?side arteriovenous (AV, carotid?jugular) shunt, and a left?sided arterio?arterial (AA, carotid?carotid) interposition shunt in each animal. After shunt implantation, animals were randomly assigned to one of 3 groups. Transcutaneous, weekly 30?minute treatments (total of 4 treatments) of either guided high MI US+MB (Group 1; n=6) using a 3% MRX?801 MB infusion, or US alone (Group 2; n=6) were given separately to each shunt. The third group of 6 pigs received no treatments. The shunts were explanted after 4 weeks and analyzed by histopathology to quantify luminal thrombus area (mm2) for the length of each shunt. No pigs received antiplatelet agents or anticoagulants during the treatment period. The median overall thrombus burden in the 3 groups for AV shunts was 5.10 mm2 compared with 4.05 mm2 in AA (P=0.199). Group 1 pigs had significantly less thrombus burden in the AV shunts (median 2.5 mm2) compared with Group 2 (median 5.6 mm2) and Group 3 (median 7.5 mm2) pigs (P=0.006). No difference in thrombus burden was seen between groups for AA shunts. Conclusion Transcutaneous US with intravenous MB is capable of preventing thrombus accumulation in arteriovenous shunts without the need for antiplatelet agents, and may be a method of preventing progressive occlusion of palliative shunts. PMID:24518555

  14. Design and measurement of improved capacitively-shunted flux qubits

    NASA Astrophysics Data System (ADS)

    Sears, Adam; Birenbaum, Jeffrey; Hover, David; Gudmundsen, Theodore; Kerman, Andrew; Welander, Paul; Yoder, Jonilyn L.; Gustavsson, Simon; Jin, Xiaoyue; Kamal, Archana; Clarke, John; Oliver, William

    2014-03-01

    The addition of a capacitive or inductive shunt across one of the junctions can alter the coherence properties of a classic flux or RF-SQUID qubit. We have studied the performance of capacitively shunted flux qubits fabricated with MBE aluminum, starting from a 2D coplanar waveguide geometry used in similar high-performance transmon qubits, and measured dispersively. We will detail the importance of design parameters that preserve the flux qubit's anharmonicity and discuss conclusions about materials quality based on calculations of the participation of junction, dielectric, and superconductor components. This research was funded in part by the Office of the Director of National Intelligence (ODNI), Intelligence Advanced Research Projects Activity (IARPA); and by the Assistant Secretary of Defense for Research & Engineering under Air Force Contract number FA8721-05-C-0002. All statements of fact, opinion or conclusions contained herein are those of the authors and should not be construed as representing the official views or policies of IARPA, the ODNI, or the U.S. Government Present address: SLAC National Accelerator Laboratory, Menlo Park, CA.

  15. Hepatic focal nodular hyperplasia with congenital portosystemic shunt.

    PubMed

    Cho, Yuki; Shimono, Taro; Morikawa, Hiroyasu; Shintaku, Haruo; Tokuhara, Daisuke

    2014-12-01

    Hepatic focal nodular hyperplasia (FNH) is a rare benign tumor in children. Vascular anomalies have been identified as pathological features of FNH, but the etiology remains unclear. We describe a rare case including the time course of formation of hepatic FNH in response to congenital portosystemic shunt (PSS). A 4-month-old girl was identified on newborn mass screening to have hypergalactosemia, but no inherited deficiencies in galactose-metabolizing enzymes were found. Ultrasonography and per-rectal portal scintigraphy showed intrahepatic PSS of the right lobe as a cause of the hypergalactosemia. At age 12 months, the patient had elevated hepatic enzymes and small hypoechoic hepatic lesions around the shunt. On abdominal contrast-enhanced ultrasonography spoke-wheel sign and central stellate scar were seen, which are typical features of hepatic FNH without biopsy. Congenital intrahepatic PSS should be evaluated on abdominal contrast-enhanced ultrasonography and observed over time because of its potential to develop into hepatic FNH. PMID:25521987

  16. 77 FR 58366 - Dominion South Pipeline Company, L.P.; Gulf Shore Energy Partners, LP; Notice of Applications

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-20

    ...Gulf Shore, 333 Clay Street, Suite 4500, Houston, Texas 77002, file an application in Docket No. CP12-520-000 pursuant...Shore Energy Partners, LP, 333 Clay Street, Houston, Texas 77002, by telephone at (713) 308-8117 or by email at...

  17. Hepatic Arterial Infusion Chemotherapy Combined with Venous Embolization in a Patient with Hepatic Metastases with an Arteriovenous Shunt

    SciTech Connect

    Nishiofuku, Hideyuki; Tanaka, Toshihiro, E-mail: toshihir@bf6.so-net.ne.j [Nara Medical University, Department of Radiology (Japan); Sakaguchi, Hiroshi [Nara Prefectural Mimuro Hospital, Department of Radiology (Japan); Yamamoto, Kiyosei; Inoue, Masayoshi; Sueyoshi, Satoru [Nara Medical University, Department of Radiology (Japan); Shinnkai, Takayuki; Hasegawa, Masatoshi [Nara Medical University, Department of Nuclear Medicine and Oncoradiology (Japan); Kichikawa, Kimihiko [Nara Medical University, Department of Radiology (Japan)

    2009-07-15

    We describe herein a patient who had hepatic metastases with an arteriovenous shunt and was treated by hepatic arterial infusion chemotherapy. The arteriovenous shunt was diagnosed by {sup 99m}Tc-macroaggregated albumin scintigraphy and hepatic venous embolization was performed to reduce shunt flow.

  18. Cerebral regional oxygen saturation monitoring in pediatric malfunctioning shunt patients?,??,?

    PubMed Central

    Abramo, Thomas J.; Zhou, Chuan; Estrada, Cristina; Drayna, Patrick C.; Locklair, Matthew R.; Miller, Renee; Pearson, Matthew; Tulipan, Noel; Arnold, Donald H.

    2014-01-01

    Background Shunt malfunction produces increased intracranial pressure causing decreased cerebral regional perfusion and tissue O2sat. Cerebral regional oxygen saturation (rSO2) by near-infrared spectroscopy represents tissue perfusion and oxygen saturation. Cerebral rSO2 is used to detect cerebral ischemia in pediatric clinical settings. Objective The objective of the study was to determine the reliability of cerebral rSO2 in pediatric malfunctioning shunt. Methods A prospective observational study of pediatric patients presented to the pediatric emergency department was conducted. Confirmed malfunctioning shunt subjects had cerebral rSO2 monitoring. Results A total of 131 malfunctioning shunt subjects had cerebral rSO2 monitoring. Patient's central trend and intrasubject variability of cerebral rSO2 readings for left and right probe and malfunction sites (n = 131) are as follows: VariableOverall, mean SO2Distal, mean SO2Proximal, mean rSO2PLeft cerebral rSO2 trend69.1 (10.7)67.7 (9.81)70.0 (11.17).23Right cerebral rSO2 trend71.3 (9.6)70.5 (8.13)71.8 (10.40).42Left cerebral rSO2 variability3.57 (2.04)4.72 (2.55)2.88 (1.24)<.001Right cerebral rSO2 variability3.46 (1.95)3.77 (2.20)3.28 (1.77).19 Intrasubject left and right rSO2 Pearson correlation was ?0.46 to 0.98 (mean ± SD, 0.35 ± 0.34; median, 0.34; interquartile range, 0.06–0.61). The correlation coefficients of 99 subjects between left and right rSO2 was significantly different (P < .001), suggesting that intrasubjects' left and right rSO2 are highly correlated. Sample mean difference between left and right rSO2 were ?1.7% (95% confidence interval [CI], ?1.8 to ?1.6; P < .001) supporting overall left lower than right. Intraclass correlation for left rSO2 was 87.4% (95% CI, 87.2%?87.6%), and that for right rSO2 was 83.8% (95% CI, 83.8%?84%), showing intersubject differences accounting for the variation, and relative to intersubject variation, intrasubjects readings are consistent. Intrasubjects, left and right rSO2 highly correlate and are asymmetrical. Left and right rSO2 are consistent in intrasubject with large rSO2 variations in trend and variability across subjects. Conclusion This study demonstrates reliable cerebral rSO2 readings in subjects with malfunctioning shunts, with asymmetrical cerebral rSO2 hemispheric dynamics within subjects. PMID:23154102

  19. Left ventricular to right atrial shunt (Gerbode defect): congenital versus acquired

    PubMed Central

    2014-01-01

    Introduction Congenital left ventricular to right atrial (LV-RA) shunt (Gerbode defect) is rare, while acquired LV-RA shunt has been increasingly reported. As yet, systematically incorporated data of the LV-RA shunt have not been presented. Aim To present the clinical features, diagnostic challenge and management strategies of congenital and acquired LV-RA shunts. Material and methods The data source was based on a comprehensive literature retrieval of the LV-RA shunt in the period 1990–2013. Results In comparison with the acquired Gerbode defect, the congenital Gerbode defect group of patients were younger and were associated more often with additional congenital disorders. Previous cardiac surgery and infective endocarditis were the two major aetiologies of the occurrence of the acquired shunts. Paravalvular abscess was associated in 10.2% and atrioventricular block in 13.6% of the acquired group patients. Transoesophageal echocardiography showed a higher diagnostic accuracy, lower missed diagnosis and lower inclusive diagnosis rates, in comparison to transthoracic echocardiography, but the misdiagnosis rates of the two modalities did not differ from each other. Four (4.5%) of the acquired group patients were complicated by atrioventricular block following surgical or interventional closure of the shunt. Eight (9.1%) patients died in the acquired group, but no patient died in the congenital group. Conclusions The diagnosis of an LV-RA shunt is quite challenging, especially in the context of coexisting abnormalities including an additional intracardiac shunt, tricuspid regurgitation, pulmonary artery hypertension and infective endocarditis, which have to be carefully differentiated from the shunt by further investigations. A better control of infective complications and careful manoeuvres during surgery may help to keep the LV-RA-sensitive septum intact. PMID:25489305

  20. Relationship between right-to-left shunts and cutaneous decompression illness.

    PubMed

    Wilmshurst, P T; Pearson, M J; Walsh, K P; Morrison, W L; Bryson, P

    2001-05-01

    The presence of a large right-to-left shunt is associated with neurological decompression illness after non-provocative dives, as a result of paradoxical gas embolism. A small number of observations suggest that cutaneous decompression illness is also associated with a right-to-left shunt, although an embolic aetiology of a diffuse rash is more difficult to explain. We performed a retrospective case--control comparison of the prevalence and sizes of right-to-left shunts determined by contrast echocardiography performed blind to history in 60 divers and one caisson worker with a history of cutaneous decompression illness, and 123 historical control divers. We found that 47 (77.0%) of the 61 cases with cutaneous decompression illness had a shunt, compared with 34 (27.6%) of 123 control divers (P<0.001). The size of the shunts in the divers with cutaneous decompression illness was significantly greater than in the controls. Thus 30 (49.2%) of the 61 cases with cutaneous decompression illness had a large shunt at rest, compared with six (4.9%) of the 123 controls (P<0.001). During closure procedures in 17 divers who had cutaneous decompression illness, the mean diameter of the foramen ovale was 10.9 mm. Cutaneous decompression illness occurred after dives that were provocative or deep in subjects without shunts, but after shallower and non-provocative dives in those with shunts. The latter individuals are at increased risk of neurological decompression illness. We conclude that cutaneous decompression illness has two pathophysiological mechanisms. It is usually associated with a large right-to-left shunt, when the mechanism is likely to be paradoxical gas embolism with peripheral amplification when bubble emboli invade tissues supersaturated with nitrogen. Cutaneous decompression illness can also occur in individuals without a shunt. In these subjects, the mechanism might be bubble emboli passing through an 'overloaded' lung filter or autochthonous bubble formation. PMID:11294694

  1. Comparison of Shunt Types in the Norwood Procedure for Single-Ventricle Lesions

    PubMed Central

    Ohye, Richard G.; Sleeper, Lynn A.; Mahony, Lynn; Newburger, Jane W.; Pearson, Gail D.; Lu, Minmin; Goldberg, Caren S.; Tabbutt, Sarah; Frommelt, Peter C.; Ghanayem, Nancy S.; Laussen, Peter C.; Rhodes, John F.; Lewis, Alan B.; Mital, Seema; Ravishankar, Chitra; Williams, Ismee A.; Dunbar-Masterson, Carolyn; Atz, Andrew M.; Colan, Steven; Minich, L. LuAnn; Pizarro, Christian; Kanter, Kirk R.; Jaggers, James; Jacobs, Jeffrey P.; Krawczeski, Catherine Dent; Pike, Nancy; McCrindle, Brian W.; Virzi, Lisa; Gaynor, J. William

    2010-01-01

    BACKGROUND The Norwood procedure with a modified Blalock–Taussig (MBT) shunt, the first palliative stage for single-ventricle lesions with systemic outflow obstruction, is associated with high mortality. The right ventricle–pulmonary artery (RVPA) shunt may improve coronary flow but requires a ventriculotomy. We compared the two shunts in infants with hypoplastic heart syndrome or related anomalies. METHODS Infants undergoing the Norwood procedure were randomly assigned to the MBT shunt (275 infants) or the RVPA shunt (274 infants) at 15 North American centers. The primary outcome was death or cardiac transplantation 12 months after randomization. Secondary outcomes included unintended cardiovascular interventions and right ventricular size and function at 14 months and transplantation-free survival until the last subject reached 14 months of age. RESULTS Transplantation-free survival 12 months after randomization was higher with the RVPA shunt than with the MBT shunt (74% vs. 64%, P = 0.01). However, the RVPA shunt group had more unintended interventions (P = 0.003) and complications (P = 0.002). Right ventricular size and function at the age of 14 months and the rate of nonfatal serious adverse events at the age of 12 months were similar in the two groups. Data collected over a mean (±SD) follow-up period of 32±11 months showed a nonsignificant difference in transplantation-free survival between the two groups (P = 0.06). On nonproportional-hazards analysis, the size of the treatment effect differed before and after 12 months (P = 0.02). CONCLUSIONS In children undergoing the Norwood procedure, transplantation-free survival at 12 months was better with the RVPA shunt than with the MBT shunt. After 12 months, available data showed no significant difference in transplantation-free survival between the two groups. (ClinicalTrials.gov number, NCT00115934.) PMID:20505177

  2. Universality of Non-Ohmic Shunt Leakage in Thin-Film Solar Cells

    SciTech Connect

    Dongaonkar, S.; Servaites, J. D.; Ford, G. M.; Loser, Stephen; Moore, J.; Gelfand, R. M.; Mohseni, H. W.; Agrawal, R.; Ratner, Mark A.; Marks, Tobin J.; Lundstrom, M. S.; Alam, M. A.

    2010-01-01

    We compare the dark current-voltage (IV) characteristics of three different thin-film solar cell types: hydrogenated amorphous silicon (a-Si:H) p-i-n cells, organic bulk heterojunction (BHJ) cells, and Cu(In,Ga)Se{sub 2} (CIGS) cells. All three device types exhibit a significant shunt leakage current at low forward bias (Vshunt current exhibits non-Ohmic behavior, as opposed to the traditional constant shunt resistance model for photovoltaics. We show here that this shunt leakage (I{sub sh} ) , across all three solar cell types considered, is characterized by the following common phenomenological features: (a) voltage symmetry about V=0 , (b) nonlinear (power law) voltage dependence, and (c) extremely weak temperature dependence. Based on this analysis, we provide a simple method of subtracting this shunt current component from the measured data and discuss its implications on dark IV parameter extraction. We propose a space charge limited (SCL) current model for capturing all these features of the shunt leakage in a consistent framework and discuss possible physical origin of the parasitic paths responsible for this shunt current mechanism.

  3. Universality of non-Ohmic shunt leakage in thin-film solar cells

    NASA Astrophysics Data System (ADS)

    Dongaonkar, S.; Servaites, J. D.; Ford, G. M.; Loser, S.; Moore, J.; Gelfand, R. M.; Mohseni, H.; Hillhouse, H. W.; Agrawal, R.; Ratner, M. A.; Marks, T. J.; Lundstrom, M. S.; Alam, M. A.

    2010-12-01

    We compare the dark current-voltage (IV) characteristics of three different thin-film solar cell types: hydrogenated amorphous silicon (a-Si:H) p-i-n cells, organic bulk heterojunction (BHJ) cells, and Cu(In,Ga)Se2 (CIGS) cells. All three device types exhibit a significant shunt leakage current at low forward bias (V <˜0.4) and reverse bias, which cannot be explained by the classical solar cell diode model. This parasitic shunt current exhibits non-Ohmic behavior, as opposed to the traditional constant shunt resistance model for photovoltaics. We show here that this shunt leakage (Ish), across all three solar cell types considered, is characterized by the following common phenomenological features: (a) voltage symmetry about V =0, (b) nonlinear (power law) voltage dependence, and (c) extremely weak temperature dependence. Based on this analysis, we provide a simple method of subtracting this shunt current component from the measured data and discuss its implications on dark IV parameter extraction. We propose a space charge limited (SCL) current model for capturing all these features of the shunt leakage in a consistent framework and discuss possible physical origin of the parasitic paths responsible for this shunt current mechanism.

  4. Flexural wave band-gaps in phononic metamaterial beam with hybrid shunting circuits

    NASA Astrophysics Data System (ADS)

    Zhang, Hao; Wen, Ji-Hong; Chen, Sheng-Bing; Wang, Gang; Wen, Xi-Sen

    2015-03-01

    Periodic arrays of hybrid-shunted piezoelectric patches are used to control the band-gaps of phononic metamaterial beams. Passive resistive-inductive (RL) shunting circuits can produce a narrow resonant band-gap (RG), and active negative capacitive (NC) shunting circuits can broaden the Bragg band-gaps (BGs). In this article, active NC shunting circuits and passive resonant RL shunting circuits are connected to the same piezoelectric patches in parallel, which are usually called hybrid shunting circuits, to control the location and the extent of the band-gaps. A super-wide coupled band-gap is generated when the coupling between RG and the BG occurs. The attenuation constant of the infinite periodic structure is predicted by the transfer matrix method, which is compared with the vibration transmittance of a finite periodic structure calculated by the finite element method. Numerical results show that the hybrid-shunting circuits can make the band-gaps wider by appropriately selecting the inductances, negative capacitances, and resistances. Project supported by the National Natural Science Foundation of China (Grant Nos. 51275519 and 51175501).

  5. 78 FR 77770 - Ironwood Equity Fund, LP; Notice Seeking Exemption Under Section 312 of the Small Business...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-24

    ...Section 107.730, Financings which Constitute...730). Ironwood Equity Fund, LP proposes...Fund II, LP. The financing is brought within...because Ironwood Equity Fund, LP proposes...Fund II, LP has an equity interest of at least...effect the proposed Financing requires prior...

  6. Correlation of experimental rCBF determinations in goats with flow measurements from a Doppler-modified carotid artery shunt

    SciTech Connect

    Loftus, C.M.; Silvidi, J.A.; Becker, J.A.; Miller, B.V.; Bernstein, D.D.

    1989-01-01

    A carotid artery shunt system has been developed that continuously monitors blood flow rates by embedding a Doppler crystal in the shunt wall. The crystal ranges through a liquid lens that enables it to be placed without violation of the shunt lumen. Because the crystal is at a fixed angle (45 degrees) to the axis of blood flow and the diameter of the lumen remains constant, a linear relationship exists between flow rates and the Doppler velocity signal. This shunt system was previously tested in vitro using a pulsatile pump and was found to be accurate to within 4.7% of the actual flow rate. In the present study, animal (goat) experiments were performed consisting of simultaneous carotid shunt flow and bilateral rCBF measurements by the radiolabeled microsphere technique to determine in vivo the accuracy of this Doppler modified shunt and to ascertain the ability of shunt flow to increase in the face of acute contralateral carotid occlusion. Data from five animals show that in vivo shunt flow can be recorded to within 13% of control rCBF and that shunt flow increases nearly 50% under conditions of distal demand (contralateral carotid occlusion). This device may prove useful in laboratory studies of carotid shunt dynamics and in clinical practice to quickly detect correctable shunt flow abnormalities.

  7. LP turbine retrofit modernization: Improvements in performance and operation

    SciTech Connect

    Groenedaal, J.C.; Fowls, L.G.; Subbiah, R.; Maxwell, B.P. [Westinghouse Electric Corp., Orlando, FL (United States); Persson, B. [Vattenfall AB, Varobacka (Sweden)

    1996-11-01

    Westinghouse Electric Corporation retrofitted six low pressure (LP) nuclear turbine rotors and associated blade path components at Ringhals 1, a 1960`s vintage English Electric (GEC) unit located near Varobacka, Sweden, and operated by Vattenfall AB. This achieved significant performance improvements and provided improved mechanical features over the original equipment. This paper, discusses design, manufacture, installation, operation and project coordination. The retrofit processes employed for these units can be applied to any potential customers units.

  8. Lp Bounds for Spectral Clusters for Lipschitz Metrics

    E-print Network

    Smith, Hart F.

    flow for |t| > -1/3 Problem: bi-characteristic flow not well-posed x = p(t, x, ) Lipx , = px (t, x after time 1/3 Hart F. Smith Lp Bounds for Spectral Clusters #12;First use of energy flow arguments On each interval, where Aa,m = 2m-overlap region, ua L8(I Aa,m) 5/24 23m/8 a1/2 . Sum over I, ua L8(Aa

  9. Algorithms for infinite quadratic programming in Lp spaces

    NASA Astrophysics Data System (ADS)

    Chen, Shen-Yu; Wu, Soon-Yi

    2008-04-01

    We study infinite dimensional quadratic programming problems of an integral type. The decision variable is taken in the Lp space where 1

  10. The effects of dobutamine and dopamine on intrapulmonary shunt and gas exchange in healthy humans

    PubMed Central

    Bryan, Tracey L.; van Diepen, Sean; Bhutani, Mohit; Shanks, Miriam; Welsh, Robert C.

    2012-01-01

    The development of intrapulmonary shunts with increased cardiac output during exercise in healthy humans has been reported in several recent studies, but mechanisms governing their recruitment remain unclear. Dobutamine and dopamine are inotropes commonly used to augment cardiac output; however, both can increase venous admixture/shunt fraction (Qs/Qt). It is possible that, as with exercise, intrapulmonary shunts are recruited with increased cardiac output during dobutamine and/or dopamine infusion that may contribute to the observed increase in Qs/Qt. The purpose of this study was to examine how dobutamine and dopamine affect intrapulmonary shunt and gas exchange. Nine resting healthy subjects received serial infusions of dobutamine and dopamine at incremental doses under normoxic and hyperoxic (inspired O2 fraction = 1.0) conditions. At each step, alveolar-to-arterial Po2 difference (A-aDo2) and Qs/Qt were calculated from arterial blood gas samples, intrapulmonary shunt was evaluated using contrast echocardiography, and cardiac output was calculated by Doppler echocardiography. Both dobutamine and dopamine increased cardiac output and Qs/Qt. Intrapulmonary shunt developed in most subjects with both drugs and paralleled the increase in Qs/Qt. A-aDo2 was unchanged due to a concurrent rise in mixed venous oxygen content. Hyperoxia consistently eliminated intrapulmonary shunt. These findings contribute to our present understanding of the mechanisms governing recruitment of these intrapulmonary shunts as well as their impact on gas exchange. In addition, given the deleterious effect on Qs/Qt and the risk of neurological complications with intrapulmonary shunts, these findings could have important implications for use of dobutamine and dopamine in the clinical setting. PMID:22700799

  11. Percutaneous Transjugular Direct Porto-caval Shunt in Patients with Budd-Chiari Syndrome

    SciTech Connect

    Quateen, A. [Charite Campus Virchow Clinic, Universitaetsmedizin Berlin, Department of Diagnostic and Interventional Radiology (Germany); Pech, M. [University of Magdeburg, Department of Radiology and Nuclear Medicine (Germany); Berg, T.; Bergk, A. [Charite Campus Virchow Clinic, Universitaetsmedizin Berlin, Department of Hepatogastroenterology (Germany); Podrabsky, P.; Felix, R. [Charite Campus Virchow Clinic, Universitaetsmedizin Berlin, Department of Diagnostic and Interventional Radiology (Germany); Ricke, J. [University of Magdeburg, Department of Radiology and Nuclear Medicine (Germany)], E-mail: jens.ricke@medizin.uni-magdeburg.de

    2006-08-15

    The purpose of the study was to evaluate the feasibility and effectiveness of direct porto-caval shunts in patients with Budd-Chiari syndrome (BCS) in whom there is no access to the hepatic veins during transjugular intrahepatic portosystemic shunt (TIPSS). We included six consecutive patients with fulminant/acute Budd-Chiari syndrome (mean age: 35 years) in whom a conventional TIPSS was not possible due to inaccessible hepatic veins. We performed a direct porto-caval shunt via a transhepatic approach. Patients were followed up by means of clinical examination, laboratory investigations, and Doppler ultrasound. TIPSS implantation from the inferior vena cava (IVC) was successful in all six patients (100%). The median transhepatic shunt length was 9 cm (8-10 cm). No procedure-related complications were observed in our patients. Early shunt occlusion occurred in three out of six patients (50%). In all three of these patients, the stent used to stabilize the shunt ended 1-2 cm before reaching the IVC. All occlusions were successfully recanalized. One of these patients developed recurrent early shunt as well as mesenteric and splenic vein occlusions. She died 7 days after TIPSS placement due to an unmanageable coagulation disorder. The remaining five patients were followed up by planned clinical examination and laboratory investigations (mean follow-up time was 15 months; patient 1 was followed up for 13 months, patient 2 for 14 months, patient 3 for 15 months, and patients 4 and 5 for 16 months) and all displayed a complete and durable resolution of liver failure and ascites without reintervention. In patients with acute liver failure originating from BCS and inaccessible hepatic veins, a direct transhepatic porto-caval shunt can be performed safely and effectively under ultrasound guidance. Future studies in larger patient groups should investigate if the patency of transcaval TIPSS with long transhepatic shunt segments is similar compared to conventional TIPSS via the hepatic vein.

  12. Staged Transcatheter Treatment of Portal Hypoplasia and Congenital Portosystemic Shunts in Children

    SciTech Connect

    Bruckheimer, Elchanan, E-mail: elchananb@bezeqint.net; Dagan, Tamir [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel)] [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel); Atar, Eli; Schwartz, Michael [Schneider Children's Medical Center Israel, Section of Radiology (Israel)] [Schneider Children's Medical Center Israel, Section of Radiology (Israel); Kachko, Ludmila [Schneider Children's Medical Center Israel, Section of Anesthesiology (Israel)] [Schneider Children's Medical Center Israel, Section of Anesthesiology (Israel); Superina, Riccardo; Amir, Gabriel [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel)] [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel); Shapiro, Rivka [Schneider Children's Medical Center Israel, Section of Gastroenterology (Israel)] [Schneider Children's Medical Center Israel, Section of Gastroenterology (Israel); Birk, Einat [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel)] [Schneider Children's Medical Center Israel, Section of Pediatric Cardiology (Israel)

    2013-12-15

    Purpose: Congenital portosystemic shunts (CPSS) with portal venous hypoplasia cause hyperammonemia. Acute shunt closure results in portal hypertension. A transcatheter method of staged shunt reduction to afford growth of portal vessels followed by shunt closure is reported. Methods: Pressure measurements and angiography in the CPSS or superior mesenteric artery (SMA) during temporary occlusion of the shunt were performed. If vessels were diminutive and the pressure was above 18 mmHg, a staged approach was performed, which included implantation of a tailored reducing stent to reduce shunt diameter by {approx}50 %. Recatheterization was performed approximately 3 months later. If the portal pressure was below 18 mmHg and vessels had developed, the shunt was closed with a device. Results: Six patients (5 boys, 1 girl) with a median age of 3.3 (range 0.5-13) years had CPSS portal venous hypoplasia and hyperammonemia. Five patients underwent staged closure. One patient tolerated acute closure. One patient required surgical shunt banding because a reducing stent could not be positioned. At median follow-up of 3.8 (range 2.2-8.4) years, a total of 21 procedures (20 transcatheter, 1 surgical) were performed. In all patients, the shunt was closed with a significant reduction in portal pressure (27.7 {+-} 11.3 to 10.8 {+-} 1.8 mmHg; p = 0.016), significant growth of the portal vessels (0.8 {+-} 0.5 to 4.0 {+-} 2.4 mm; p = 0.037), and normalization of ammonia levels (202.1 {+-} 53.6 to 65.7 {+-} 9.6 {mu}mol/L; p = 0.002) with no complications. Conclusion: Staged CPSS closure is effective in causing portal vessel growth and treating hyperammonemia.

  13. Microwave power heterojunction bipolar transistors fabricated with thermal shunt bathtub

    SciTech Connect

    Bozada, C.A.; Barlage, D.W.; Barrette, J.P. [and others

    1995-12-31

    Heterojunction bipolar transistor devices and circuits were fabricated using thermal shunt and bathtub thermal management techniques. Broadband cascode MMICs exhibited 10 - 14 dB gain at an output power of 2.5 - 3.0 Watts across 7 - 11 GHz. A 200 {mu}m{sup 2} common-emitter unit cell achieved 7 - 8 dB linear power gain and 40% power-added efficiency at a noise power ratio (NPR) of 18 dBc at 12 GHz. Under single tone measurements at 12 GHz, the unit cell achieved 52% power-added efficiency, with 9.5 dB linear gain, 8 dB power gain and 240 mW output power at 5 V bias.

  14. Smell of danger: an analysis of LP-gas odorization

    SciTech Connect

    Cain, W.S.; Turk, A.

    1985-03-01

    LP-gas derives warning properties from the odorants ethyl mercaptan or thiophane. Laboratory tests have implied that the average person has the ability to smell the odors before leaking LP-gas reaches one-fifth its lower limit of flammability. Generally, however, laboratory tests ignore or discard persons with a poor sense of smell, especially the elderly and persons with certain types of hyposmia. Some persons who apparently can smell the warning agents when directed may otherwise fail to notice or identify them. Elderly men seem particularly vulnerable to instances of incidental anosmia and olfactory agnosia. Psychophysical testing of the warning agents has been rather unsophisticated. There exists neither a standard protocol for testing nor adequate specification of the perceptual properties that might make one warning agent better than another. Without such developments, improvement in warning agents will fail to occur. Possible improvements include increases in concentration, the use of blends to insure more uniform delivery of agent and, to decrease the perceptual vulnerability of relatively insensitive people, use of agents with favorable psychophysical (stimulus-response) functions and use of agents with favorable adaptation characteristics. Even without a change in existing products, it seems advisable to learn more about the vulnerability of LP-gas users and to employ educational means to reduce risks.

  15. Smell of danger: an analysis of LP-gas odorization.

    PubMed

    Cain, W S; Turk, A

    1985-03-01

    LP-gas derives warning properties from the odorants ethyl mercaptan or thiophane. Laboratory tests have implied that the average person has the ability to smell the odors before leaking LP-gas reaches one-fifth its lower limit of flammability. Generally, however, laboratory tests ignore or discard persons with a poor sense of smell, especially the elderly and persons with certain types of hyposmia. Some persons who apparently can smell the warning agents when directed may otherwise fail to notice or identify them. Elderly men seem particularly vulnerable to instances of incidental anosmia and olfactory agnosia. Psychophysical testing of the warning agents has been rather unsophisticated. There exists neither a standard protocol for testing nor adequate specification of the perceptual properties that might make one warning agent better than another. Without such developments, improvement in warning agents will fail to occur. Possible improvements include increases in concentration, the use of blends to insure more uniform delivery of agent and, to decrease the perceptual vulnerability of relatively insensitive people, use of agents with favorable psychophysical (stimulus-response) functions and use of agents with favorable adaptation characteristics. Even without a change in existing products, it seems advisable to learn more about the vulnerability of LP-gas users and to employ educational means to reduce risks. PMID:3887879

  16. A new method for measuring cerebrospinal fluid flow in shunts.

    PubMed

    Hara, M; Kadowaki, C; Konishi, Y; Ogashiwa, M; Numoto, M; Takeuchi, K

    1983-04-01

    An implantable device for measurement of cerebrospinal fluid (CSF) flow in a ventriculoperitoneal shunt tube has been developed. The unit is energized by an extracorporeal high-frequency generator (200 KHz), and electrolysis creates bubbles in the shunt tube. Velocity of bubble flow is detected by a pair of ultrasonic Doppler probes placed a certain distance apart on the skin surface and in parallel with the implanted tube. The CSF flow rate is calculated taking into account velocity and tube diameter, and is expressed in ml/min. The unit consists of a coil with a capacitor, a silicon diode to rectify the high frequency, and a Zener diode to regulate maximum output voltage of 20 V. The output is fed to a pair of platinum electrodes placed inside the unit's tunnel through which the CSF flows. These components are molded in epoxy resin and coated with medical-grade silicone rubber. In animal experiments, CSF flow rates ranging from 0.033 to 1.0 ml/min could be measured by this flowmeter. Clinically, CSF flow has been measured to date in several cases. In two cases of communicating hydrocephalus occurring after the onset of cerebrovascular disease, and in which the CSF flow was continuously monitored for 24 hours, the flow rate ranged between 0.05 and 0.78 ml/min. The CSF flow rate fluctuates in a 24-hour period, increasing in the morning, especially between 12 midnight and 6 a.m., which suggests a circadian rhythm. PMID:6219190

  17. 75 FR 20870 - Montreux Equity Partners II SBIC, L.P.; Montreux Equity Partners III SBIC, L.P.; Notice Seeking...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-21

    ...III SBIC, L.P. proposes to sell part of its equity interest in Renal CarePartners, Inc., 4000 Hollywood Blvd., Suite 300N, Hollywood, FL 33021 to Montreux Equity Partners II SBIC, L.P. The financing is brought within the...

  18. Transjugular intrahepatic portosystemic stent-shunt: technical factors and new developments.

    PubMed

    Tripathi, Dhiraj; Redhead, Doris

    2006-11-01

    The introduction of expandable metal stents in the mid 1980s led to the development of transjugular intrahepatic portosystemic stent-shunt (TIPSS) as we know it today. Short-lived detrimental effects on the hyperdynamic circulation in cirrhosis accompany the acute reduction in portal pressure following TIPSS creation. Caution is needed in patients with cardiac dysfunction or pulmonary hypertension. With increasing expertise and careful patient selection, fatal procedural complications are rare and TIPSS can even be safely used as a bridge to liver transplantation. Shunt insufficiency and hepatic encephalopathy are more common following TIPSS. Currently, however, novel approaches to tackling both these limitations exist. These include the combination of uncovered TIPSS with variceal band ligation, and the introduction of polytetrafluoroethylene covered stents. Despite the lack of controlled studies, covered stents are now widely used and have the potential to drastically reduce shunt insufficiency, the need for long-term shunt surveillance and even hepatic encephalopathy. PMID:17033430

  19. Noninvasive prediction of shunt operation outcome in idiopathic normal pressure hydrocephalus

    PubMed Central

    Aoki, Yasunori; Kazui, Hiroaki; Tanaka, Toshihisa; Ishii, Ryouhei; Wada, Tamiki; Ikeda, Shunichiro; Hata, Masahiro; Canuet, Leonides; Katsimichas, Themistoklis; Musha, Toshimitsu; Matsuzaki, Haruyasu; Imajo, Kaoru; Kanemoto, Hideki; Yoshida, Tetsuhiko; Nomura, Keiko; Yoshiyama, Kenji; Iwase, Masao; Takeda, Masatoshi

    2015-01-01

    Idiopathic normal pressure hydrocephalus (iNPH) is a syndrome characterized by gait disturbance, cognitive deterioration and urinary incontinence in elderly individuals. These symptoms can be improved by shunt operation in some but not all patients. Therefore, discovering predictive factors for the surgical outcome is of great clinical importance. We used normalized power variance (NPV) of electroencephalography (EEG) waves, a sensitive measure of the instability of cortical electrical activity, and found significantly higher NPV in beta frequency band at the right fronto-temporo-occipital electrodes (Fp2, T4 and O2) in shunt responders compared to non-responders. By utilizing these differences, we were able to correctly identify responders and non-responders to shunt operation with a positive predictive value of 80% and a negative predictive value of 88%. Our findings indicate that NPV can be useful in noninvasively predicting the clinical outcome of shunt operation in patients with iNPH. PMID:25585705

  20. Urethral protrusion of the abdominal catheter of ventriculoperitoneal shunt: Case report of extremely rare complication.

    PubMed

    Yazar, Ugur; Kanat, Ayhan; Akca, Nezih; Gazioglu, Gurkan; Arda, Irfan S; Kazdal, Hizir

    2012-05-01

    Hydrocephalus in its various forms constitutes one of the major problems in pediatric neurosurgical practice. The placement of a ventriculoperitoneal (VP) shunt is the most common form of treatment for hydrocephalus, so that all neurosurgeons struggle with shunt malfunctions and their complications. Well-known complications are connected with the use of the valve systems (malfunction, infectious, overdrainage, secondary craniosynostosis, etc.). We report an unusual case of protruding abdominal catheter from the urethra. This girl had received a VP shunt for hydrocephalus following surgery of posterior fossa medulloblastoma 4 years ago. After admission, the entire system was removed, antibiotic treatment was administered for 2 weeks, and a new VP shunt was placed. The postoperative course was uneventful. This complication is extremely rare. PMID:23248688

  1. Experiences with the tracheoesophageal shunt method for vocal rehabilitation after total laryngectomy.

    PubMed

    Saito, H; Matsui, T; Tachibana, M; Nishimura, H; Mizukoshi, O

    1977-12-20

    The tracheoesophageal (T-E) shunt technique reported by Komorn et al. (1973) was used for vocal rehabilitation in 8 laryngectomized patients including one case of hypopharyngeal cancer. It was proved that this technique was a simple one-stage procedure with a low incidence of complication. Four out of 7 patients, excluding one patient who died of another disease, acquired excellent speech without symptomatic aspiration. Two patients developed fairly good speech. One shunt was closed by aspiration. The shunt constructed by a flap measuring 2 x 4 cm, opened 1 cm below the distal end of the trachea, showed good results. The T-E shunt speech exceeds esophageal speech in duration and intelligibility. PMID:579987

  2. Unusual Gross Pneumocephalus and Pneumoperitoneum after VP Shunt Surgery: A Case Report

    PubMed Central

    A, Khanolkar; YK, Sarin

    2015-01-01

    We report an unusual case where a two-month infant developed a simultaneous and spontaneous pneumocephalus and gross pneumoperitoneum along with progressive surgical emphysema after VP shunt procedure. PMID:26034715

  3. Vibration and wave propagation attenuation for metamaterials by periodic piezoelectric arrays with high-order resonant circuit shunts

    NASA Astrophysics Data System (ADS)

    Zhou, Wanlu; Wu, You; Zuo, Lei

    2015-06-01

    Beam or plate metamaterials with periodic piezoelectric arrays have attracted more and more attention in recent years for wave propagation attenuation and the corresponding vibration reduction. Conventional designs use resistive shunt (R-shunt) and resistor-inductor shunt (RL-shunt). An innovative metamaterial with a high-order resonant shunt circuit is proposed and investigated for vibration and wave propagation attenuation in this paper. The proposed high-order resonant shunt circuit can introduce two local resonances in series around the tuning frequency to broaden the attenuation bandwidth, or can create two separate resonances to achieve two separate bandgaps. Finite element modeling of the beam metamaterial with wave propagation and vibration in the transverse direction is established. Simulations have been conducted to compare the vibration attenuation performances among R-shunt, RL-shunt, and the proposed high-order shunt. An impedance-based method has been presented for the parameter design of electrical components in the proposed high-order shunt for bandgaps at two desired frequencies.

  4. Elevation of intracranial pressure following transjugular intrahepatic portosystemic stent-shunt for variceal haemorrhage

    Microsoft Academic Search

    Rajiv Jalan; Kostas Dabos; Doris N. Redhead; Alistair Lee; Peter C. Hayes

    1997-01-01

    Increased intracranial pressure and cerebral oedema in patients with chronic liver disease is rare and is more typical of acute liver failure. Transjugular intrahepatic portosystemic stent-shunt is being increasingly used in the management of uncontrolled variceal haemorrhage in patients with cirrhosis. In our institution, a total of 160 patients has undergone transjugular intrahepatic porto-systemic stent-shunt for variceal haemorrhage; 56 of

  5. Experimental Percutaneous Extrahepatic Portacaval Shunt Creation by Transjugular Approach in Swine

    SciTech Connect

    Seong, Chang Kyu; Pavcnik, Dusan, E-mail: pavcnikd@ohsu.edu; Uchida, Barry T.; Anai, Hiroshi; Timmermans, Hans; Niyyati, Mahtab [Oregon Health and Science University, L342, Dotter Interventional Institute (United States); Corless, Christopher L. [Oregon Health and Science University, L342, Department of Pathology (United States); Correa, Luiz O.; Keller, Frederick S.; Roesch, Josef [Oregon Health and Science University, L342, Dotter Interventional Institute (United States)

    2005-06-15

    The purpose of the study was to evaluate the feasibility of the creation of a percutaneous extrahepatic portacaval shunt (PEPS) in swine by a transjugular approach and to find a suitable stent-graft to use in PEPS. In 12 swine, the extrahepatic portal vein (PV) was entered from the inferior vena cava (IVC) by a needle system introduced from the transjugular approach. A catheter introduced through the transhepatic approach served as a target. Five types of stent-graft consisting of homemade Z stents and a polytetrafluoethylene cover were explored for PEPS creation. Eight animals had follow-up venograms up to 6 weeks or until the shunt became severely stenotic. Gross and histologic examinations were performed after the final follow-up venography. The PV punctures and stent-graft placement were difficult, but the PEPS was established in all animals. In four animals, the stent-graft failed to adequately cover the tract, causing severe hemorrhage. Only two shunts remained patent up to 6 weeks. The other shunts exhibited severe stenosis or occlusion. At gross examination, all shunts traversed the liver parenchyma of the caudate lobe surrounding the IVC. The extravascular PEPS portion was 4 mm to 2 cm long. All shunts entered the PV close to the splenomesenteric junction and exhibited neointimal formation. Shunt stenoses were caused by neointimal hyperplasia and occlusions by a superimposed thrombus. PEPS can be created by the transjugular approach in swine, but only the PV shunt entrance is extrahepatic. None of the tested rigid stent-grafts were suitable for PEPS creation. A short flexible stent-graft with flanged ends is suggested for further exploration.

  6. Impact of shunt capacitor banks on substation surge environment and surge arrester applications

    SciTech Connect

    NONE

    1996-10-01

    The introduction of high voltage shunt capacitor banks on a power system can result in a number of overvoltage problems that tend to be associated with capacitor switching. Proper application of surge arresters near a shunt capacitor bank requires careful analysis of the power system, the switching devices and their arrangements, the insulation level of nearby equipment, the type of grounding, and the arrester energy dissipation duty.

  7. Spontaneous expectoration of a Blalock-Taussig shunt a decade after operation

    PubMed Central

    Kothari, Shyam S; Murugan, Madhan Kumar; Chowdhury, Ujjwal Kumar

    2015-01-01

    An eleven-year-old boy expectorated a foreign body in cough that was identified as the prosthetic graft used for a Blalock-Taussig shunt. The shunt procedure was done 10 years earlier, and a definitive repair for tetralogy of Fallot was done a year later. He had no other symptoms, and a computed tomography (CT) angiogram did not reveal any other significant anomaly. The reason for this extremely rare event is unclear. PMID:25684887

  8. Right-to-Left-Shunts Detected by Transesophageal Echocardiography and Transcranial Doppler Sonography

    Microsoft Academic Search

    Dirk W. Droste; Carsten Schmidt-Rimpler; Thomas Wichter; Ralf Dittrich; Martin Ritter; Jörg Stypmann; E. Bernd Ringelstein

    2004-01-01

    Background: Transesophageal echocardiography (TEE) and transcranial Doppler sonography (TCD) can identify right-to-left-shunts that predispose to paradoxical embolism. In a large cohort we compared the results of both techniques. Methods: 222 patients were investigated by both techniques using the contrast agent Echovist®-300 and performing each test once without and once with the Valsalva maneuver (VM). Results: TEE-proven right-to-left-shunts were detected by

  9. In vitro hydrodynamic properties of the Miethke proGAV hydrocephalus shunt

    Microsoft Academic Search

    David M Allin; Zofia H Czosnyka; Marek Czosnyka; Hugh K Richards; John D Pickard

    2006-01-01

    BACKGROUND: Adjustable shunts are very popular in the management of hydrocephalus and are believed to help in minimizing the number of surgical revisions. The drawback with almost all constructions is that they may be accidentally readjusted in relatively weak magnetic fields (around 30–40 mTesla) MATERIALS AND METHODS: The ProGav Miethke shunt is composed of an adjustable ballon-spring valve unit and

  10. Multiple PZT transducers implemented with multiple-mode piezoelectric shunting for passive vibration damping

    NASA Astrophysics Data System (ADS)

    Wu, Shu-yau

    1999-06-01

    In an earlier paper we reported a method for multiple-mode shunt-damping of structural vibration modes. It was successfully demonstrated in experiments on a two-wing cantilever beam to reduce three structural vibration modes simultaneously using a single piezoelectric PZT transducer. This multiple-mode shunting method is particularly useful for reduction of several vibration modes on structures that are limited in surface area and must be lightweight. To obtain a better overall damping performance for some structures, we have extended this shunting technique by employing multiple PZT transducers; each is implemented with a multiple-mode shunt circuit. This paper reports the reason why multiple transducers are needed and how we design the multiple-mode shunt circuits for them. This is described with experiments performed on two structures: one, a simple cantilever beam and the other, a cut-out panel from an F-15 fighter aircraft. Both of the structures are bonded with several PZT transducers implemented with multiple-mode shunt circuits. In the cantilever beam structure, we show the advantage of using a different transducer for controlling modes that are otherwise not controllable with the first transducer alone. For the F-15 panel, five PZT transducers were bonded on the inner surface of the panel. During the shunting experiment, the panel was excited with an acoustic load. We report how we determined the locations and the number of the transducers, and how we designed and implemented them with multiple-mode shunt circuits to control the two high-structural-vibration modes. Detailed experimental results are presented.

  11. Cranial disjunction and visual failure in a slit ventricle syndrome with patent shunt

    Microsoft Academic Search

    P. Van Bogaert; C. Raftopoulos; M. Cordonnier; C. Chaskis; H. B. Szliwowski

    1996-01-01

    A 6.5-year-old child who received a shunt at 3 weeks of age for triventricular hydrocephalus related to his congenital toxoplasmosis developed symtoms of intracranial hypertension and papilloedema. Computed tomographic scan demonstrated slit ventricles. The shunt device was shown to be patent on isotope transit study. Spontaneously the cranial sutures widened and headaches disappeared, but loss of vision occurred and did

  12. Accuracy of the transpulmonary ultrasound dilution method for detection of small anatomic shunts.

    PubMed

    Saxena, R; Krivitski, N; Peacock, K; Durward, A; Simpson, J M; Tibby, S M

    2015-06-01

    The purpose of this study was to investigate the qualitative and quantitative accuracy of transpulmonary ultrasound dilution (UD) (COstatus™, Transonic Systems) for the detection of small anatomic shunts. It was a prospective, observational study in a multi-disciplinary pediatric intensive care unit. Seventy-three critically ill children (67 post cardiac surgery), with a median (IQR) age of 10 (3-50.3) months and a median (IQR) weight of 8 (3.43-13) kg were enrolled. Ultrasound dilution (UD) measurements were performed on patients within 1 h of undergoing two-dimensional echocardiography, which was used as the comparator technique. Shunt was diagnosed by characteristic changes on the UD curve shape, and was considered "test-positive" only if two or more measurements suggested the presence of the shunt. The UD technology also provided an estimate of pulmonary to systemic blood flow ratio (Qp:Qs). 12/73 (16.4 %) patients had a shunt identified by both UD and echocardiography. The overall accuracy (95 % CI) was 86.1 % (75.6-96.6 %), with a sensitivity of 85.7 % (57.2-98.2 %) and specificity of 86.4 % (75.0-94.0 %). The estimated Qp:Qs ranged from 0.7 to 1.4, which was consistent qualitatively with the echocardiographic findings on color flow doppler. Shunt was detected by UD alone in eight children; six of these had clinical conditions known to compromise dilution curve analysis (valve regurgitation, asymmetric pulmonary blood flow). Shunt was detected by echocardiography alone in two children; in both cases the shunt was tiny. UD is an accurate method for the detection of small anatomical shunts, both qualitatively and quantitatively. PMID:25240251

  13. Capstone Low Pressure Grid-connect Tests Capstone LP Stand-alone Tests

    E-print Network

    Appendix B Capstone Low Pressure Grid-connect Tests 10/25/2000 #12;Capstone LP Stand-alone Tests 10) Figure B-1: Power and Shaft Speed ­ 10 kW Steps #12;Capstone LP Stand-alone Tests 10/25/2000 0 5000 10000) Figure B-2: Power and Turbine Exit Temperature ­ 10 kW Steps #12;Capstone LP Stand-alone Tests 10

  14. z=0 z=0 z=0 Steam-turbin Condenser LP-pump

    E-print Network

    Skogestad, Sigurd

    ¡ ¢£ ¤ ¥§¦ ¨ © ¥£ ¡ £ ¨ © ¦ ¦ ¡ £ ¨ © ¦ ¦ ¥ ¦ © © ¡ ¥ ¥ £ ¦ ¡ ! ¦ " ©# £ $ ¤ #12; 4 ¡ 3 @ ¢ 2 6 3 F 4 9 7 LC LC PC z=0 z=0 z=0 z=1 z=1 TC TC z=0 HP-pump Steam-turbin Condenser LP-pump Air compressor Deaerator HP-pump Steam-turbin Condenser LP-pump Air compressor Deaerator HP-pump Condenser LP-pump Air compressor Deaerator Pre-heaterSuper-heater Evaporator Economizer Condenser drum Gas

  15. Effects of twisting and bending on LP21 mode propagation in optical fiber.

    PubMed

    Yuan, Yufeng; Wu, George; Li, Xian; Fan, Yuqiang; Wu, Xingkun

    2011-11-01

    Twisting and bending characteristics of low-multimode LP21 mode propagation in optical fibers is presented for the first time. Theoretical fiber mode modeling, combining geometrical rotation with opto-elastic effects, demonstrates that the propagation of the LP21 mode is bending-effect-immune. Experimental testing verifies that the LP21 mode specklegram rotates 0.9112 of the fiber twist angle in a fused silica fiber, independent of any fiber bending. This characteristic allows for the LP21 mode to be highly applicable in fiber specklegram sensors. PMID:22048380

  16. Delipidation of insect lipoprotein, lipophorin, affects its binding to the lipophorin receptor, LpR: implications for the role of LpR-mediated endocytosis.

    PubMed

    Roosendaal, Sigrid D; Van Doorn, Jan M; Valentijn, Karine M; Van der Horst, Dick J; Rodenburg, Kees W

    2009-02-01

    The insect lipophorin receptor (LpR), an LDL receptor (LDLR) homologue that is expressed during restricted periods of insect development, binds and endocytoses high-density lipophorin (HDLp). However, in contrast to LDL, HDLp is not lysosomally degraded, but recycled in a transferrin-like manner, leaving a function of receptor-mediated uptake of HDLp to be uncovered. Since a hallmark of circulatory HDLp is its ability to function as a reusable shuttle that selectively loads and unloads lipids at target tissues without being endocytosed or degraded, circulatory HDLp can exist in several forms with respect to lipid loading. To investigate whether lipid content of the lipoprotein affects binding and subsequent endocytosis by LpR, HDLp was partially delipidated in vitro by incubation with alpha-cyclodextrin, yielding a particle of buoyant density 1.17g/mL (HDLp-1.17). Binding experiments demonstrated that LpR bound HDLp-1.17 with a substantially higher affinity than HDLp both in LpR-transfected Chinese hamster ovary (CHO) cells and isolated insect fat body tissue endogenously expressing LpR. Similar to HDLp, HDLp-1.17 was targeted to the endocytic recycling compartment after endocytosis in CHO(LpR) cells. The complex of HDLp-1.17 and LpR appeared to be resistant to endosomal pH, as was recently demonstrated for the LpR-HDLp complex, corroborating that HDLp-1.17 is recycled similar to HDLp. This conclusion was further supported by the observation of a significant decrease with time of HDLp-1.17-containing vesicles after endocytosis of HDLp-1.17 in LpR-expressing insect fat body tissue. Collectively, our results indicate that LpR favors the binding and subsequent endocytosis of HDLp-1.17 over HDLp, suggesting a physiological role for LpR in selective endocytosis of relatively lipid-unloaded HDLp particles, while lipid reloading during their intracellular itinerary might result in decreased affinity for LpR and thus allows recycling. PMID:19049873

  17. Effects of isradipine and other calcium antagonists on arteriovenous-shunt flow in anesthetized rabbits and cats

    SciTech Connect

    Hof, R.P.

    1989-04-17

    The effects of vasodilators on arteriovenous (AV)-shunt flow was investigated in anesthetized cats and rabbits, using the tracer microsphere method. In cats, the calcium antagonist isradipine reduced AV-shunt flow; verapamil showed a similar tendency and nicardipine was without effect. Dihydralazine strongly increased, but nitroglycerin and dipyridamole decreased AV-shunt flow. In rabbits, the effects of isradipine and verapamil were similar to those seen in cats. Sodium nitroprusside had no effect, whereas prazosin, minoxidil, and the potassium-channel activator cromakalim increased AV-shunt flow. The contrasting effects of drugs sharing the same mechanism of action suggest that target-tissue selectivity is more important than the mechanism of action. An increase of AV-shunt flow is unlikely to be beneficial but could be associated with a number of undesirable side effects. It might negatively affect migraine sufferers and, if AV-shunt dilatation shows no tolerance development, it represents an unnecessary hemodynamic burden for the heart.

  18. Scaling of electromagnetic transducers for shunt damping and energy harvesting

    NASA Astrophysics Data System (ADS)

    Elliott, Stephen J.; Zilletti, Michele

    2014-04-01

    In order for an electromagnetic transducer to operate well as either a mechanical shunt damper or as a vibration energy harvester, it must have good electromechanical coupling. A simple two-port analysis is used to derive a non-dimensional measure of electromechanical coupling, which must be large compared with unity for efficient operation in both of these applications. The two-port parameters for an inertial electromagnetic transducer are derived, from which this non-dimensional coupling parameter can be evaluated. The largest value that this parameter takes is approximately equal to the square of the magnetic flux density times the length of wire in the field, divided by the mechanical damping times the electrical resistance. This parameter is found to be only of the order of one for voice coil devices that weigh approximately 1 kg, and so such devices are generally not efficient, within the definition used here, in either of these applications. The non-dimensional coupling parameter is found to scale in approximate proportion to the device's characteristic length, however, and so although miniaturised devices are less efficient, greater efficiency can be obtained with large devices, such as those used to control civil engineering structures.

  19. Integrated fuel cell stack shunt current prevention arrangement

    DOEpatents

    Roche, Robert P. (Cheshire, CT); Nowak, Michael P. (Bolton, CT)

    1992-01-01

    A fuel cell stack includes a plurality of fuel cells juxtaposed with one another in the stack and each including a pair of plate-shaped anode and cathode electrodes that face one another, and a quantity of liquid electrolyte present at least between the electrodes. A separator plate is interposed between each two successive electrodes of adjacent ones of the fuel cells and is unified therewith into an integral separator plate. Each integral separator plate is provided with a circumferentially complete barrier that prevents flow of shunt currents onto and on an outer peripheral surface of the separator plate. This barrier consists of electrolyte-nonwettable barrier members that are accommodated, prior to the formation of the integral separator plate, in corresponding edge recesses situated at the interfaces between the electrodes and the separator plate proper. Each barrier member extends over the entire length of the associated marginal portion and is flush with the outer periphery of the integral separator plate. This barrier also prevents cell-to-cell migration of any electrolyte that may be present at the outer periphery of the integral separator plate while the latter is incorporated in the fuel cell stack.

  20. Geometric Studies of Shunt and Lead Orientation in EEC Devices

    NASA Astrophysics Data System (ADS)

    Werner, F. M.; Solin, S. A.

    2014-03-01

    Electric field sensors are ubiquitous in modern technology, from field effect transistors (FETs) in circuit boards to point-of-care testing (POCT) devices used in detecting the presence of specific protein markers in blood. The transport properties of these devices are limited by two general categories: intrinsic material properties and extrinsic geometric effects. Devices with a maximum electric field resolution of 3.05V/cm were previously reported. The metal semiconductor hybrid (MSH) devices are constructed by forming a Schottky interface between a mesa of nGaAs and Ti, while four ohmic leads surround the perimeter of the mesa and are used for four point resistance measurements. These devices exhibit extraordinary electroconductance (EEC) and make it possible to correlate measured four point resistance to changes in the local electric field. While maximizing the EEC response by optimizing the intrinsic material properties has been theoretically investigated, we present a phenomenological study of the impact of lead orientation and shunt geometry in the sensing capabilities of these devices. S.A.S. is a co-founder of and has a financial interest in PixelEXX, a start-up company whose mission is to market imaging arrays.

  1. Hyperglucagonemia and hyperkinetic circulation after portocaval shunt in the rat

    SciTech Connect

    Kravetz, D.; Arderiu, M.; Bosch, J.; Fuster, J.; Visa, J.; Casamitjana, R.; Rodes, J.

    1987-02-01

    The study was aimed at investigating whether increased portal venous inflow (PVI) after portocaval shunt (PCS) in the rat is the result of selective splanchnic vasodilatation or whether it is part of a generalized circulatory disturbance. Rats with PCS and sham-operated controls were studied 2 wk after surgery by measuring cardiac output (CO), PVI, and hepatic artery flow (HAF) with radioactive microspheres (V Cr and UC). Plasma glucagon (GL) was measured by radioimmunoassay. PCS rats had increased CO and reduced arterial pressure and total peripheral resistance. PVI was markedly increased, but this appeared to be part of a generalized circulatory disturbance, since when PVI is expressed as percent of CO no difference is observed between PCS and sham-operated rats, indicating the absence of a preferential splanchnic vasodilatation. GL increased after PCS, and significant correlations were observed between GL and CO and between GL and PVI. HAF increased after PCS but did not compensate the loss of portal flow, evidence by a lower total hepatic flow in PCS rats. These results suggest that PCS induces a hyperkinetic circulatory state in which increased PVI represents its splanchnic manifestation and that increased GL release may be in part responsible for these hemodynamic changes.

  2. T1-201 per rectum: A noninvasive method for evaluating portosystemic shunt

    SciTech Connect

    Verdickt, X.; Reding, P.; Tshiamala, P.; Ham, H.R.

    1984-01-01

    Portosystemic shunt is one of the most important complications of liver cirrhosis. Unfortunately, current methods for detecting and quantifying this shunt are either non-specific or associated with significant morbidity. The aim of this work was to evaluate the clinical value of a new non-traumatic method which consisted of administrating T1-201 per rectum and monitoring the absorbed activity using a camera and a computer system. The method assumes that in the absence of portosystemic shunt, most of the absorbed activity will be fixed in the liver while in the presence of this shunt, some of the activity will be fixed in the myocardium. The ratio of heart to liver activity can therefore be used to evaluate the importance of the portosystemic shunt. 34 subjects have been studied. The ratio of heart to liver activity at the 25th minute after the tracer administration is higher in patients with liver cirrhosis (n=22, m=.9, s.d.=.37) than in patients with steatosis (n=10, m=.28, s.d.=.03). In two healthy subjects investigated the H/L ratio was .27 and .30. The reproducibility of the test was evaluated in 8 subjects and showed a good reproducibility (mean of difference =.03, range=.01 to .07). Patients with esophageal varices had always a high H/L ratio while some patients with liver cirrhosis without esophageal varices had also high H/L ratio, probably due to the presence of intrahepatic shunt. The authors' results showed the value of this new non-traumatic test for detecting and quantifying extra- as well as intrahepatic portosystematic shunt.

  3. Cerebrospinal fluid shunt dynamics in patients with idiopathic adult hydrocephalus syndrome.

    PubMed Central

    Malm, J; Kristensen, B; Fagerlund, M; Koskinen, L O; Ekstedt, J

    1995-01-01

    The objective was to assess CSF dynamics of different shunt constructions in patients with adult hydrocephalus syndrome and correlate these findings to clinical outcome, neuroradiology, and the specifications of the shunts provided by the manufacturer. Thirty four patients with idiopathic adult hydrocephalus (normal pressure hydrocephalus) syndrome were included in a prospective, consecutive case series. A differential pressure valve (Cordis Hakim standard system) was used in 28 patients and a variable resistance valve (Cordis Orbis-Sigma) in six. A constant pressure infusion method was used; CSF pressure and conductance were determined before surgery. Three months after shunt placement CSF pressure, the "pressure v flow" curve, and gravity induced flow were measured. There was no difference between mean preoperative and postoperative resting CSF pressures in patients with Hakim shunts. The opening pressures of the Hakim shunts were higher than the value proposed by the manufacturer. A pronounced gravity effect induced CSF flow and decrease of the CSF pressure. In functioning variable resistance valves, CSF dynamics normalised postoperatively. There was no gravity effect and the characteristics shaped "pressure v flow" curve was sometimes seen. Six patients (three differential pressure valves, three variable resistance valves) had non-functioning shunts. Four of these patients were improved after the operation but improvement was transient in three. In all patients, there was no relation between the width of the ventricles and clinical improvement or CSF pressure. In conclusion, the differential pressure valve system does not behave according to the specifications provided by the manufacturer. A decrease in CSF pressure in patients with this shunt was solely due to the effect of gravity. Eleven percent of the differential pressure valves and 50% of the variable resistance valves were non-functioning. In the functioning variable resistance valves, the antisiphon system seems to be effective. Images PMID:7608674

  4. Post-TIPS Hepatic Encephalopathy Treated by Occlusion Balloon-Assisted Retrograde Embolization of a Coexisting Spontaneous Splenorenal Shunt

    SciTech Connect

    Shioyama, Yasukazu; Matsueda, Kiyoshi; Horihata, Koushi; Kimura, Masashi [Department of Radiology, Central Hospital and Cancer Center of Ibaraki Prefecture, 6528 Koibuchi Tomobe-machi, Nishiibaraki-gun, Ibaraki, Japan 309-17 (Japan); Nishida, Norifumi; Kishi, Kazushi; Terada, Masaki; Sato, Morio; Yamada, Ryusaku [Department of Radiology, Wakayama Medical College, 27 7-bancho, Wakayama-shi, Wakayama, Japan 640 (Japan)

    1996-11-15

    A 51-year-old man with posthepatitis cirrhosis underwent a transjugular intrahepatic portosystemic shunt (TIPS) for bleeding of recurrent esophageal varices. The patient had a coexisting, spontaneous, splenorenal shunt. He subsequently developed hepatic encephalopathy, presumably due to excessive portosystemic shunting. Since medical management resulted in no significant improvement, the splenorenal shunt was embolized from the jugular vein approach via renal vein access during temporary balloon occlusion. Within a few days, the patient's hepatic encephalopathy resolved. Twelve months later the patient showed no recurrence of encephalopathy and had maintained a patent TIPS.

  5. LP as a Global Search Heuristic Across Difierent Constrainedness Regions? Extended Abstract

    Microsoft Academic Search

    Lucian Leahu; Carla Gomes

    We study the behavior of heuristics based on the LP re- laxation with respect to the underlying constraindness of the problem. Our study focuses on the Latin square (or quasigroup) completion prob- lem (1))1 as a prototype for highly combinatorial problems. We flnd that simple techniques based on the LP relaxation of the problem provide satisfactory guidance for under- and

  6. 75 FR 74029 - Sabine Pass LNG, L.P.; Notice of Application

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-30

    ...CP11-32-000] Sabine Pass LNG, L.P.; Notice of Application...November 12, 2010, Sabine Pass LNG, L.P. (Sabine Pass...operate a redundant high pressure boil off gas compressor at its existing Sabine Pass LNG Terminal, located in...

  7. 78 FR 26358 - TransCanada Keystone Pipeline, LP; Notice of Petition for Declaratory Order

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-06

    ...Commission [Docket No. OR13-17-000] TransCanada Keystone Pipeline, LP; Notice of Petition for Declaratory Order Take...CFR 385.207(a)(2)(2012), TransCanada Keystone Pipeline, LP filed a petition seeking a declaratory...

  8. 76 FR 28026 - TransCanada Keystone Pipeline, LP; Notice of Request for Waiver

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-13

    ...Docket No. OR11-7-000] TransCanada Keystone Pipeline, LP; Notice of Request for Waiver Take notice that on May 2, 2011, TransCanada Keystone Pipeline, LP (TransCanada Keystone) filed a request for waiver of the...

  9. 75 FR 28485 - Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-21

    ...Mike Borfitz, Aerospace Engineer, International...Closure and MED Inflatable Seal Failure...adjacent fuselage structure may be damaged...2010-11-02 Gulfstream Aerospace LP (Type Certificate...to Gulfstream Aerospace LP (Type Certificate...Closure and MED Inflatable Seal Failure...adjacent fuselage structure may be...

  10. 78 FR 71601 - Shell Pipeline Company LP; Notice of Petition for Declaratory Order

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-29

    ...Energy Regulatory Commission [Docket No. OR14-9-000] Shell Pipeline Company LP; Notice of Petition for Declaratory Order...Practices and Procedure, 18 CFR 385.207(a)(2)(2013), Shell Pipeline Company LP (SPLC) filed a petition requesting a...

  11. 78 FR 69078 - Houston Pipe Line Company LP; Notice of Application

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-18

    ...Line Company LP (HPL), 1300 Main Street, Houston, Texas 77002, filed an application in Docket No. CP14-13-000 under...Houston Pipe Line Company LP, 1300 Main Street, Houston, TX 77002, or by calling (713) 989-7010 (telephone) or...

  12. 77 FR 29624 - Cheniere Creole Trail Pipeline, L.P.; Notice of Application

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-05-18

    ...L.P. (Cheniere), 700 Milam, Suite 800, Houston, TX 77002, filed an application in Docket No. CP12-351-000 pursuant...Trail Pipeline, L.P., 700 Milam, Suite 800, Houston, TX 77002, (713) 375-5000 (phone),...

  13. 76 FR 12103 - Erie Boulevard Hydropower, L.P; Notice of Settlement Agreement and Soliciting Comments

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-03-04

    ...Project No. 2713-082] Erie Boulevard Hydropower, L.P; Notice of Settlement Agreement...2011. d. Applicant: Erie Boulevard Hydropower, L.P. e. Location: The existing...Contact: Daniel Daoust, Erie Boulevard Hydropower, 33 West 1st Street, South,...

  14. 78 FR 23552 - Dominion Cove Point LNG, LP; Notice of Application

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-04-19

    ...PF12-16-000] Dominion Cove Point LNG, LP; Notice of Application Take notice that on April 1, 2013, Dominion Cove Point LNG, LP (Dominion Cove Point), 120 Tredegar...for the export at its existing Cove Point LNG terminal in Calvert County,...

  15. 76 FR 40723 - Dominion Cove Point LNG, LP; Notice of Technical Conference

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-11

    ...RP11-2136-000; RP11-2137-000] Dominion Cove Point LNG, LP; Notice of Technical Conference On May 27, 2011, pursuant...section 4 of the Natural Gas Act (NGA), Dominion Cove Point LNG, LP (Cove Point) filed revised tariff records in Docket...

  16. 77 FR 71585 - Brookfield Energy Marketing LP v. ISO New England Inc.; Notice of Complaint

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-03

    ...Docket No. EL13-23-000] Brookfield Energy Marketing LP v. ISO New England Inc.; Notice of Complaint Take notice that on November...Marketing LP (Complainant) filed a formal complaint against ISO New England Inc. (Respondent) alleging that the...

  17. 76 FR 81360 - Special Conditions: Gulfstream Aerospace LP (GALP) Model G280 Airplane, Operation Without Normal...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-12-28

    ...Conditions: Gulfstream Aerospace LP (GALP) Model G280 Airplane, Operation Without Normal...for the Gulfstream Aerospace LP (GALP) Model G280 airplane. This airplane will have...applied for a type certificate for their new Model G280 airplane. The Model G280 will...

  18. "Espacios Lp no conmutativos " Fecha: 9 y 11 de septiembre, a las 10.00 horas.

    E-print Network

    Tradacete, Pedro

    Seminario "Espacios Lp no conmutativos " Fecha: 9 y 11 de septiembre, a las 10.00 horas. Seminario DEPARTAMENTO DE ANÁLISIS MATEMÁTICO Abstract: Los espacios Lp no conmutativos son una herramienta básica en campos como la probabilidad cuántica, el análisis armónico no conmutativo, los espacios de operadores o

  19. Evaluation of the new automated ELISA Vidas Lp(a) assay. Comparison with an immunonephelemetric method.

    PubMed

    Mesli, S; Demailly, S; Le Moigne, F; Derache, P; Jouzier, E

    1998-04-27

    Lipoprotein (a) [Lp(a)] is a lipoprotein which has a plasma concentration that is highly correlated with cardiovascular disease. In this study, the new Lp(a) assay for the Vitek Immuno-Diagnostic Assay System (VIDAS) developed by bioMérieux was evaluated. This method uses an enzyme linked fluorescent immunoassay (ELFIA) technique. Within-run and between-run reproducibility of the Vidass Lp(a) assay are characterized by coefficients of variation (CV) of 3 to 5.9% and 3.9 to 5.9%, respectively. Using analysis of variance, no statistical difference was shown between ELFIA and immunonephelometric assay (INA). When comparing results of the Vidas Lp(a) test with the INA, a highly significant correlation of r = 0.9708 and regression line equation y = 0.963x-0.037 was found. Interference of lipemia was studied: no influence was observed up to 12.3 mmol l(-1) triglycerides. No interference of haemoglobin was noted for Lp(a) > 0.20 g l(-1). Hyperbilirubinemia ( > 120 micromol l(-1)) led to results being underestimated for concentrations of Lp(a) which were < 0.20 g l(-1). No pre-analytical interference of citrate was measured but pre-analytical interference of EDTA was found. In conclusion, this new fully automated immunofluorimetric Lp(a) assay enables to the rapid, accurate and reliable determination of Lp(a) in blood samples. PMID:9641359

  20. AMSC 607 / CMSC 764 Advanced Numerical Optimization Renegar's LP IPM Convergence Analysis

    E-print Network

    O'Leary, Dianne P.

    AMSC 607 / CMSC 764 Advanced Numerical Optimization Fall 2010 Renegar's LP IPM Convergence Analysis Dianne P. O'Leary c 2010 Renegar's approach to IPMs James Renegar's book, A Mathematical View of Interior for a particular IPM for LP. Here we summarize the argument. Our starting point Our starting point

  1. External lumbar drain: A pragmatic test for prediction of shunt outcomes in idiopathic normal pressure hydrocephalus

    PubMed Central

    Chotai, Silky; Medel, Ricky; Herial, Nabeel A.; Medhkour, Azedine

    2014-01-01

    Background: The consensus on most reliable supplemental test to predict the shunt responsiveness in patients with idiopathic normal pressure hydrocephalus (iNPH) is lacking. The aim of this study is to discuss the utility of external lumbar drain (ELD) in evaluation of shunt responsiveness for iNPH patients. Methods: A retrospective review of 66 patients with iNPH was conducted. All patients underwent 4-day ELD trial. ELD-positive patients were offered ventriculoperitoneal shunt (VPS) surgery. The primary outcome evaluation parameters were gait and mini mental status examination (MMSE) assessment. The family and patient perception of improvement was accounted for in the outcome evaluation. Results: There were 38 male and 28 female with mean age of 74 years (range 45-88 years). ELD trial was positive in 86% (57/66) of patients. No major complications were encountered with the ELD trial. A total of 60 patients (57 ELD-positive, 3 ELD-negative) underwent VPS insertion. The negative ELD trial (P = 0.006) was associated with poor outcomes following shunt insertion. The positive ELD trial predicted shunt responsiveness in 96% patients (P < 0.0001, OR = 96.2, CI = 11.6-795.3). A receiver operating characteristic (ROC) curve analysis revealed that the ELD trial is reasonably accurate in differentiating shunt responder from non-responder in iNPH patients (area under curve = 0.8 ± 0.14, P = 0.02, CI = 0.52-1.0). The mean follow-up period was 12-months (range 0.3-3 years). The significant overall improvement after VPS was seen in 92% (55/60). The improvement was sustained in 76% of patients at mean 3-year follow-up. The number of comorbid conditions (P = 0.034, OR = 4.15, CI = 1.2-9.04), and a history of cerebrovascular accident (CVA) (P = 0.035, OR = 4.4, CI = 1.9-14.6) were the predictors of poor outcome following shunt surgery. Conclusion: The positive ELD test predicted shunt responsiveness in 96% of patients. With adequate technique, maximal results with minimal complications can be anticipated. The number of comorbidities, history of CVA and negative ELD test were significantly associated with poor shunt outcomes. PMID:24678428

  2. Transjugular intrahepatic portosystemic shunts and portal hypertension-related complications.

    PubMed

    Siramolpiwat, Sith

    2014-12-01

    Portal hypertension (PH) plays an important role in the natural history of cirrhosis, and is associated with several clinical consequences. The introduction of transjugular intrahepatic portosystemic shunts (TIPS) in the 1980s has been regarded as a major technical advance in the management of the PH-related complications. At present, polytetrafluoroethylene-covered stents are the preferred option over traditional bare metal stents. TIPS is currently indicated as a salvage therapy in patients with bleeding esophageal varices who fail standard treatment. Recently, applying TIPS early (within 72 h after admission) has been shown to be an effective and life-saving treatment in those with high-risk variceal bleeding. In addition, TIPS is recommended as the second-line treatment for secondary prophylaxis. For bleeding gastric varices, applying TIPS was able to achieve hemostasis in more than 90% of patients. More trials are needed to clarify the efficacy of TIPS compared with other treatment modalities, including cyanoacrylate injection and balloon retrograde transvenous obliteration of gastric varices. TIPS should also be considered in bleeding ectopic varices and refractory portal hypertensive gastropathy. In patients with refractory ascites, there is growing evidence that TIPS not only results in better control of ascites, but also improves long-term survival in appropriately selected candidates. In addition, TIPS is a promising treatment for refractory hepatic hydrothorax. However, the role of TIPS in the treatment of hepatorenal and hepatopulmonary syndrome is not well defined. The advantage of TIPS is offset by a risk of developing hepatic encephalopathy, the most relevant post-procedural complication. Emerging data are addressing the determination the optimal time and patient selection for TIPS placement aiming at improving long-term treatment outcome. This review is aimed at summarizing the published data regarding the application of TIPS in the management of complications related to PH. PMID:25493012

  3. Kidney plays a major role in ammonia homeostasis after portasystemic shunting in patients with cirrhosis.

    PubMed

    Olde Damink, Steven W M; Dejong, Cornelis H C; Deutz, Nicolaas E P; Redhead, Doris N; Hayes, Peter C; Soeters, Peter B; Jalan, Rajiv

    2006-08-01

    The kidney plays an important role in ammonia metabolism. In this study the hypothesis was tested that the kidney can acutely diminish ammonia release after portacaval shunting. Thirteen patients with cirrhosis (6 female/7 male, age 54.4 +/- 3.3 yr) were studied. Blood was sampled prior to and 1 h after transjugular intrahepatic stent-shunt (TIPSS) insertion from the portal vein, a hepatic vein, the right renal vein, and the femoral vein, and renal and liver plasma flow were measured. Prior to TIPSS, renal ammonia release was significantly higher than ammonia release from the splanchnic region, which was not significantly different from zero. TIPSS insertion did not change arterial ammonia concentration or ammonia release from the splanchnic region but reduced renal ammonia release into the circulation (P < 0.05) to values that were not different from zero. TIPSS resulted in a tendency toward increased venous-arterial ammonia concentration differences across leg muscle. Post-TIPSS ammonia efflux via portasystemic shunts was estimated to be seven times higher than renal efflux. Kidneys have the ability to acutely diminish systemic ammonia release after portacaval shunting. Diminished renal ammonia release and enhanced muscle ammonia uptake are important mechanisms by which the cirrhotic patient maintains ammonia homeostasis after portasystemic shunting. PMID:16455791

  4. Barry shunt for treatment of a 76-hour stuttering priapism without subsequent erectile dysfunction

    PubMed Central

    Osmonov, Daniar Kurmanbekovich; Aksenov, Aleksey; Guerra Sandoval, Andrea Nathaly; Kalz, Almut; Juenemann, Klaus Peter

    2014-01-01

    Introduction This paper reports treatment of a 76-hour low-flow priapism with a shunting procedure that was first described by Barry in 1976. We were able to observe the preservation of erectile function despite the long period of ischemia. A review of the literature shows that there are few reports of erectile function recovery after a priapism of similar duration. Materials and methods A 42-year-old patient presented with a 76-hour priapism, probably caused by consumption of alcohol and illegal drugs. A Barry Shunt procedure was performed. The erectile function of the patient was assessed by means of International Index of Erectile Function score over a follow-up period of 30 months. Moreover, we reviewed different surgical options for treatment of priapism in the literature. Results Partial return of erection without sexual arousal occurred on two occasions during the 10-day hospitalization, but was treated by manipulation of the penis, ie, by milking the tumescence into the shunt. After 3 months, the shunt was still palpable as a subcutaneous swelling. Six months postoperatively, the residual swelling had disappeared. The International Index of Erectile Function score was of 21 without phosphodiesterase type 5 inhibitors after a follow-up of 2.5 years. Conclusion Barry shunt is an effective alternative surgical option for the treatment of low-flow priapism. In the case of our patient, it was also effective after a 76-hour-lasting priapism. PMID:25157340

  5. The C57BL/6J Mouse Exhibits Sporadic Congenital Portosystemic Shunts

    PubMed Central

    Lei, Hongxia; Duarte, Joao M. N.; Rougemont, Anne-Laure; Oldani, Graziano; Terraz, Sylvain; Toso, Christian; Gruetter, Rolf

    2013-01-01

    C57BL/6 mice are the most widely used strain of laboratory mice. Using in vivo proton Magnetic Resonance Spectroscopy (1H MRS), we have repeatedly observed an abnormal neurochemical profile in the brains of both wild-type and genetically modified mice derived from the C57BL/6J strain, consisting of a several fold increase in cerebral glutamine and two fold decrease in myo-inositol. This strikingly abnormal neurochemical “phenotype” resembles that observed in chronic liver disease or portosystemic shunting and appeared to be independent of transgene, origin or chow and was not associated with liver failure. As many as 25% of animals displayed the abnormal neurochemical profile, questioning the reliability of this model for neurobiology. We conducted an independent study to determine if this neurochemical profile was associated with portosystemic shunting. Our results showed that 100% of the mice with high brain glutamine displayed portosystemic shunting by concomitant portal angiography while all mice with normal brain glutamine did not. Since portosystemic shunting is known to cause alterations in gene expression in many organs including the brain, we conclude that portosystemic shunting may be the most significant problem associated with C57BL/6J inbreeding both for its effect on the central nervous system and for its systemic repercussions. PMID:23936100

  6. Few Patient, Treatment, and Diagnostic or Microbiological Factors, Except Complications and Intermittent Negative Cerebrospinal Fluid (CSF) Cultures During First CSF Shunt Infection, Are Associated With Reinfection

    PubMed Central

    Simon, Tamara D.; Mayer-Hamblett, Nicole; Whitlock, Kathryn B.; Langley, Marcie; Kestle, John R. W.; Riva-Cambrin, Jay; Rosenfeld, Margaret; Thorell, Emily A.

    2014-01-01

    Background The relationship between first and subsequent cerebrospinal fluid (CSF) shunt infections is poorly understood. By understanding the factors associated with increased risk of reinfection, researchers may provide optimal treatment strategies at the time of first infection. The objective of this study was to describe and compare children with and without CSF shunt reinfection. Methods A retrospective cohort study was performed among 118 children who underwent initial CSF shunt placement and developed first CSF shunt infection. The primary outcome variable was CSF shunt reinfection. Patient risk factors and medical and surgical management of initial CSF shunt placement and first CSF shunt infection were compared between children with and without reinfection. Results Of 118 children with first infection, 31 (26%) developed a reinfection during the study period (overall median follow-up, 2096 days). Factors associated with reinfection in this cohort included ventriculoatrial or complex shunt at initial CSF shunt placement, complications after first CSF shunt infection, and intermittent negative CSF cultures. Conclusions Few patient or treatment factors were associated with reinfection. Factors associated with difficult-to-treat first CSF shunt infection, including complications after first CSF shunt infection and intermittent negative CSF cultures, were associated with reinfection. Clinicians who treat patients with unusual CSF shunts or more difficult first infections should have a high index of suspicion for reinfection after treatment is completed. PMID:24567841

  7. 77 FR 25133 - Foreign-Trade Zone 126, Temporary/Interim Manufacturing Authority, Brightpoint North America L.P...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-27

    ...Manufacturing Authority, Brightpoint North America L.P. (Cell Phone Kitting and Distribution); Notice of Approval On March...on behalf of Brightpoint North America L.P., to produce cell phone kits under FTZ procedures within FTZ 126--Site...

  8. 77 FR 33716 - Foreign-Trade Zone 70-Detroit, MI; Expansion of Subzone; Marathon Petroleum Company LP, (Oil...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-06-07

    ...Foreign-Trade Zone 70--Detroit, MI; Expansion of Subzone; Marathon Petroleum Company LP, (Oil Refinery) Detroit, MI An application...70, requesting an expansion of Subzone 70T, on behalf of Marathon Petroleum Company LP in Detroit, Michigan. The...

  9. 76 FR 67017 - Praesidian Capital Opportunity Fund III, LP License No. 02/02-0647; Notice Seeking Exemption...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-28

    ...and Section 107.730, Financings which Constitute Conflicts...LP proposes to provide debt financing to JPB Marketing Enterprises...Fund III, LP, holds a debt investment and warrant...transaction is considered as financing to discharge an...

  10. 76 FR 35263 - Founders Equity SBIC I, L.P.; Notice Seeking Exemption Under Section 312 of the Small Business...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-06-16

    ...107.730). Founders Equity SBIC I, L.P. proposes to provide equity security financing to Richardson Foods...for debt repayment. The financing is brought within the...Regulations because Founders Equity NY, L.P., an...

  11. 78 FR 43188 - Erie Boulevard Hydropower, L.P.; Notice of Application Tendered for Filing With the Commission...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-19

    ...Regulatory Commission [Project No. 7320-042] Erie Boulevard Hydropower, L.P.; Notice of Application Tendered for Filing With...Date Filed: July 1, 2013. d. Applicant: Erie Boulevard Hydropower, L.P. e. Name of Project: Chasm Hydroelectric...

  12. 76 FR 66710 - Erie Boulevard Hydropower, L.P.; Notice of Application Accepted for Filing, Soliciting Comments...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-27

    ...Regulatory Commission [Project No. 5984-063] Erie Boulevard Hydropower, L.P.; Notice of Application Accepted for Filing, Soliciting...Date Filed: May 10, 2011. d. Applicant: Erie Boulevard Hydropower, L.P. (dba Brookfield Renewable Power). e. Name...

  13. 78 FR 68044 - Erie Boulevard Hydropower, L.P.; Notice of Scoping Meetings and Environmental Site Review and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-13

    ...Regulatory Commission [Project No. 7320-042] Erie Boulevard Hydropower, L.P.; Notice of Scoping Meetings and Environmental Site...Date filed: July 1, 2013. d. Applicant: Erie Boulevard Hydropower, L.P. e. Name of Project: Chasm Hydroelectric...

  14. 78 FR 62348 - Erie Boulevard Hydropower, L.P.; Notice of Application Accepted for Filing and Soliciting Motions...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-18

    ...Regulatory Commission [Project No. 7320-042] Erie Boulevard Hydropower, L.P.; Notice of Application Accepted for Filing and...Date filed: July 1, 2013. d. Applicant: Erie Boulevard Hydropower, L.P. e. Name of Project: Chasm Hydroelectric...

  15. 77 FR 63290 - Foreign-Trade Zone 74-Baltimore, MD, Authorization of Production Activity, J.D. Neuhaus LP...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-16

    ...D. Neuhaus LP, (Overhead Lifting Equipment Production), Sparks, MD On June 13, 2012, the Baltimore Development Corporation...production activity on behalf of J.D. Neuhaus LP, located in Sparks, Maryland. The notification was processed in accordance...

  16. 78 FR 77118 - Skylar Energy LP; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-12-20

    ...DEPARTMENT OF ENERGY Federal Energy Regulatory Commission...ER14-612-000] Skylar Energy LP; Supplemental Notice That Initial Market-Based Rate Filing Includes...proceeding of Skylar Energy LP's application for market-based rate...

  17. 75 FR 19643 - Crestwood Energy LP; Supplemental Notice That Initial Market-Based Rate Filing Includes Request...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-15

    ...DEPARTMENT OF ENERGY Federal Energy Regulatory Commission...ER10-1031-000] Crestwood Energy LP; Supplemental Notice That Initial Market- Based Rate Filing Includes...proceeding of Crestwood Energy LP's application for market-based rate...

  18. 78 FR 34371 - Magnolia Energy LP; Supplemental Notice That Initial Market-Based Rate Filing Includes Request...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-07

    ...DEPARTMENT OF ENERGY Federal Energy Regulatory Commission...ER13-1578-000] Magnolia Energy LP; Supplemental Notice That Initial Market-Based Rate Filing Includes...proceeding, of Magnolia Energy LP's application for market-based rate...

  19. LP turbine retrofit of Encina 4 and 5

    SciTech Connect

    Trimble, L.; Smiarowski, M.

    1995-12-31

    Power producers are faced with the ever increasing challenge of providing cost effective and reliable power to their customers. Having reliable generating equipment is a prime concern. In 1992, San Diego Gas and Electric (SDG&E) contracted with Siemens Power Corporation (SPC) to provide a low pressure (LP) turbine rotor and inner casing replacement for its units 4 and 5 at the Encina Power Station in Carlsbad, California. These units were doubleflow single casing LP turbines originally manufactured by Westinghouse Electric and installed in 1972 (Unit 4) and 1978 (Unit 5). The original configuration was the building block (BB) 72 model, which included 6 rows of blades per flow path and a nominal 28.5 inch last stage blade length. This design had suffered from continued problems including loss of tenons, rotor steeple cracking, and blade cracking exacerbated by high back-end loading. Siemens designed a replacement steam path that would best meet the existing steam conditions and fit into the confines of the original exhaust casing, so modification work would be kept to a minimum. The replacement turbine utilized an additional stage, or 7 stages per flow path, with a 32 inch last stage blade. By using this longer last stage blade, the higher back-end loading was significantly reduced. The blading consisted of Siemens T-4 integrally shrouded drum blading on the first three stages, twisted integrally shrouded blades on stages 4 and 5, and free standing-blades for the last two rows. In addition, the last stage stationary blading utilizes a curved forward design, or {open_quotes}banana{close_quotes} blade, that distributes steam flow across the airfoil more evenly. The retrofit outages of the units had a duration of approximately 6 weeks each. Unit 4 and 5 returned to service in May and December 1994, respectively. The low pressure sections were retrofitted with the reliable Siemens design and achieved unit heat rate improvements of 2.3% and 2.7%, respectively.

  20. 75 FR 6414 - Cardinal Growth, L.P.; Notice Seeking Exemption Under Section 312 of the Small Business...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-02-09

    ...License No. 05/75-0257] Cardinal Growth, L.P.; Notice Seeking Exemption Under...Interest Notice is hereby given that Cardinal Growth, L.P., 311 South Wacker Driver...Regulations (13 CFR 107.730). Cardinal Growth, L.P. provided financing to...

  1. 75 FR 22435 - Pharos Capital Partners II, L.P.; Notice Seeking Exemption Under Section 312 of the Small...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-28

    ...ADMINISTRATION [License No. 06/76-0329] Pharos Capital Partners II, L.P.; Notice...of Interest Notice is hereby given that Pharos Capital Partners II, L.P., 1 Burton...and Regulations (13 CFR 107.730). Pharos Capital Partners II, L.P....

  2. 75 FR 64306 - Shell Energy North America (US), LP; Notice of Institution of Proceeding and Refund Effective Date

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-10-19

    ...ER08-656-007; EL10-83-000] Shell Energy North America (US), LP; Notice...concerning the justness and reasonableness of Shell Energy North America (US), LP's market...and Southwest balancing authority area. Shell Energy North America (US), LP,...

  3. 75 FR 57505 - Dell Products LP, Winston-Salem (WS-1) Division, Including On-Site Leased Workers From Adecco...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-21

    [Federal Register Volume...TA-W-72,575] Dell Products LP, Winston-Salem...applicable to workers of Dell Products LP, Winston...published in the Federal Register on April...published in the Federal Register on April...Carolina location of Dell Products LP,...

  4. 75 FR 55614 - Dell Products LP, Winston-Salem (WS-1) Division, Including On-Site Leased Workers From Adecco...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-13

    [Federal Register Volume...TA-W-72,575] Dell Products LP, Winston-Salem...applicable to workers of Dell Products LP, Winston...published in the Federal Register on April...published in the Federal Register on April...Carolina location of Dell Products LP,...

  5. 75 FR 56564 - Dell Products LP, Winston-Salem (WS-1) Division Including On-Site Leased Workers From Adecco...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-16

    [Federal Register Volume...TA-W-72,575] Dell Products LP, Winston-Salem...applicable to workers of Dell Products LP, Winston...published in the Federal Register on April...published in the Federal Register on April...Carolina location of Dell Products LP,...

  6. 78 FR 3495 - Claritas Capital Specialty Debt II, L.P.; Application No. 99000779; Notice Seeking Exemption...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-01-16

    ...Claritas Capital Specialty Debt Fund, L.P. The financing is brought within the...Claritas Capital Specialty Debt II, L.P. proposes...Claritas Capital Specialty Debt Fund, L.P. has an...effect the proposed Financing requires prior SBA...

  7. 75 FR 76001 - Erie Boulevard Hydropower L.P.; Notice of Intent To File License Application, Filing of Pre...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-12-07

    ...Project No. 7518-012] Erie Boulevard Hydropower L.P.; Notice of Intent To File License...d. Submitted By: Erie Boulevard Hydropower L.P. e. Name of Project: Hogansburg...we are designating Erie Boulevard Hydropower L.P. as the Commission's...

  8. 75 FR 51451 - Erie Boulevard Hydropower, L.P.; Notice of Intent To File License Application, Filing of Pre...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-08-20

    ...Project No. 7320-040] Erie Boulevard Hydropower, L.P.; Notice of Intent To File...d. Submitted By: Erie Boulevard Hydropower, L.P. e. Name of Project: Chasm...mudre@ferc.gov. j. Erie Boulevard Hydropower, L.P. (Erie) filed its...

  9. Use of percutaneous endoscopy to place syringopleural or cystoperitoneal cerebrospinal fluid shunts: technical note.

    PubMed

    Guest, James D; Silbert, Lisa; Casas, Carlos E

    2005-04-01

    The authors describe a technique for percutaneous endoscopic shunt placement to treat clinically symptomatic spinal cysts. Seven patients underwent the procedure--five with syringomyelia, one with a symptomatic perineurial cyst, and one with a large arachnoid cyst. In all patients the shunt was successfully placed, and clinical improvement occurred in six. In four patients the entire procedure was performed endoscopically, whereas in three conversion to an open surgical exposure was required for safe access of a syrinx cavity. Overall, however, the pleural or peritoneal catheter was successfully placed endoscopically in all seven patients. There were two cases of postoperative positional headaches of which one required valve revision. In one case the catheter migrated and required repositioning. Percutaneous endoscopic shunt placement appears feasible in appropriately selected patients. PMID:15871494

  10. A case of pulmonary arterial hypertension associated with congenital extrahepatic portocaval shunt.

    PubMed

    Yi, Jeong-Eun; Jung, Hae-Ok; Youn, Ho-Joong; Choi, Jong Young; Chun, Ho Jong; Lee, Jae Young

    2014-04-01

    Congenital extrahepatic portocaval shunt (CEPS) is a rare anomaly of the mesenteric vasculature in which the intestinal and splenic venous drainage bypasses the liver and drains directly into the inferior vena cava, the left hepatic vein or the left renal vein. This uncommon disease is frequently associated with other malformations and mainly affects females. Here we report a case of pulmonary arterial hypertension associated with CEPS (Abernethy type 1b shunt) in a 20-yr-old man who was incidentally diagnosed during evaluation of multiple nodules of the liver. The patient was treated by inhalation of iloprost (40 µg/day) with improved condition and walking test. Physicians should note that congenital portocaval shunt may cause pulmonary hypertension. PMID:24753712

  11. Resistance to Diet-Induced Obesity in Mice with Synthetic Glyoxylate Shunt

    PubMed Central

    Dean, Jason T.; Tran, Linh; Beaven, Simon; Tontonoz, Peter; Reue, Karen; Dipple, Katrina M.; Liao, James C.

    2014-01-01

    Summary Given the success in engineering synthetic phenotypes in microbes and mammalian cells, constructing non-native pathways in mammals has become increasingly attractive for understanding and identifying potential targets for treating metabolic disorders. Here we introduced the glyoxylate shunt into mouse liver to investigate mammalian fatty acid metabolism. Mice expressing the shunt showed resistance to diet-induced obesity on a high fat diet despite similar food consumption. This was accompanied by a decrease in total fat mass, circulating leptin levels, plasma triglyceride concentration, and a signaling metabolite in liver, malonyl-CoA, that inhibits fatty acid degradation. Contrary to plants and bacteria, in which the glyoxylate shunt prevents the complete oxidation of fatty acids, this pathway when introduced in mice increases fatty acid oxidation such that resistance to diet-induced obesity develops. This work suggests that using non-native pathways in higher organisms to explore and modulate metabolism may be a useful approach. PMID:19490907

  12. [The assessment of the ventilation function of the eustachian tubes after shunting of the tympanic cavity].

    PubMed

    Magomedov, M M; Levina, Iu V; Nikitkin, A Iu

    2013-01-01

    The objective of the present work was to study specific features of the eustachian tube after the insertion of the shunt into the tympanic membrane and to measure the pressure necessary to ensure passive opening of the tube in the patients presenting with exudative otitis medium (EOM). The study included 87 patients with this pathology who underwent shunting of the tympanic cavity following a course of conservative treatment. Threshold audimetry and acoustic impedancemetry were performed in all the patients to estimate the patency of the eustachian tube with the perforated tympanic membrane. It is concluded that the shunting of the tympanic cavity resulted in markedly disturbed dynamic function of the Eustachian tube in the majority of the patients (59%) regardless of the severity of hearing impairment. PMID:23715483

  13. Minimally invasive external mini-glaucoma shunt implantation without conjunctival dissection.

    PubMed

    Hoffman, Richard S; Crandall, Alan S; Crandall, David A; Fine, I Howard; Packer, Mark; Sims, Annette C

    2014-01-01

    The current method for implantation of the Ex-PRESS Glaucoma Filtration Device requires a conjunctival peritomy and shunt insertion under the guarded protection of a scleral flap. This technique requires suture closure of the flap and conjunctiva. A new minimally invasive technique for Ex-PRESS shunt implantation allows for insertion through a scleral tunnel originating from a grooved clear corneal incision. This new method avoids the need for conjunctival dissection and closure and offers the advantages of eliminating conjunctival wound leaks while maintaining the protection of a partial thickness scleral covering. This new technique may offer a faster safer means for shunt implantation with the potential for less conjunctival scarring. PMID:22922664

  14. Percutaneous vesicoamniotic shunting versus conservative management for fetal lower urinary tract obstruction (PLUTO): a randomised trial

    PubMed Central

    Morris, Rachel K; Malin, Gemma L; Quinlan-Jones, Elisabeth; Middleton, Lee J; Hemming, Karla; Burke, Danielle; Daniels, Jane P; Khan, Khalid S; Deeks, Jon; Kilby, Mark D

    2013-01-01

    Summary Background Fetal lower urinary tract obstruction (LUTO) is associated with high perinatal and long-term childhood mortality and morbidity. We aimed to assess the effectiveness of vesicoamniotic shunting for treatment of LUTO. Methods In a randomised trial in the UK, Ireland, and the Netherlands, women whose pregnancies with a male fetus were complicated by isolated LUTO were randomly assigned by a central telephone and web-based randomisation service to receive either the intervention (placement of vesicoamniotic shunt) or conservative management. Allocation could not be masked from clinicians or participants because of the invasive nature of the intervention. Diagnosis was by prenatal ultrasound. The primary outcome was survival of the baby to 28 days postnatally. All primary analyses were done on an intention-to-treat basis, but these results were compared with those of an as-treated analysis to investigate the effect of a fairly large proportion of crossovers. We used Bayesian methods to estimate the posterior probability distribution of the effectiveness of vesicoamniotic shunting at 28 days. The study is registered with the ISRCTN Register, number ISRCTN53328556. Findings 31 women with singleton pregnancies complicated by LUTO were included in the trial and main analysis, with 16 allocated to the vesicoamniotic shunt group and 15 to the conservative management group. The study closed early because of poor recruitment. There were 12 livebirths in each group. In the vesicoamniotic shunt group one intrauterine death occurred and three pregnancies were terminated. In the conservative management group one intrauterine death occurred and two pregnancies were terminated. Of the 16 pregnancies randomly assigned to vesicoamniotic shunting, eight neonates survived to 28 days, compared with four from the 15 pregnancies assigned to conservative management (intention-to-treat relative risk [RR] 1·88, 95% CI 0·71–4·96; p=0·27). Analysis based on treatment received showed a larger effect (3·20, 1·06–9·62; p=0·03). All 12 deaths were caused by pulmonary hypoplasia in the early neonatal period. Sensitivity analysis in which non-treatment-related terminations of pregnancy were excluded made some slight changes to point estimates only. Bayesian analysis in which the trial data were combined with elicited priors from experts suggested an 86% probability that vesicoamniotic shunting increased survival at 28 days and a 25% probability that it had a large, clinically important effect (defined as a relative increase of 55% or more in the proportion of neonates who survived). There was substantial short-term and long-term morbidity in both groups, including poor renal function—only two babies (both in the shunt group) survived to 2 years with normal renal function. Seven complications occurred in six fetuses from the shunt group, including spontaneous ruptured membranes, shunt blockage, and dislodgement. These complications resulted in four pregnancy losses. Interpretation Survival seemed to be higher in the fetuses receiving vesicoamniotic shunting, but the size and direction of the effect remained uncertain, such that benefit could not be conclusively proven. Our results suggest that the chance of newborn babies surviving with normal renal function is very low irrespective of whether or not vesicoamniotic shunting is done. Funding UK National Institute of Health Research, Wellbeing of Women, Hannah Eliza Guy Charity (Birmingham Children's Hospital Charity). PMID:23953766

  15. Active vibration control of a stiffened panel through application of negative capacitance shunts

    NASA Astrophysics Data System (ADS)

    Beck, Benjamin S.; Cunefare, Kenneth A.; Collet, Manuel; Ruzzene, Massimo

    2011-03-01

    Shunted piezoelectric patches form an effective control mechanism for reducing vibrations of a mechanical system. One type of shunt, a negative capacitance circuit, is capable of suppressing vibration amplitude over a broad frequency range. Most previous work has focused on control of simple test structures such as beams and plates. This work studies the performance of the negative capacitance shunt connected to piezoelectric patches attached to a stiffened aircraft panel. The placement of the piezoelectric transducers is determined using a simplified finite element model of one bay of the panel. The numerical predictions are compared to experimental results for spatial average vibration for a point force input. The amount of control for increasing number of patches is also investigated. These results give a more accurate representation of the achievable performance in real world application.

  16. A 100 GHz Josephson mixer using resistively-shunted Nb tunnel junctions

    NASA Technical Reports Server (NTRS)

    Schoelkopf, R. J.; Phillips, T. G.; Zmuidzinas, J.

    1993-01-01

    The authors describe preliminary mixer results using resistively shunted Nb/AlO(x)/Nb tunnel junctions in a 100-GHz waveguide mixer mount. The mixer utilizes robust, lithographically defined devices which have nonhysteretic I-V curves. A receiver temperature of 390 K (DSB) has been obtained with a conversion loss of -6.5 dB. The receiver's behavior agrees qualitatively with the behavior predicted by the resistively shunted junction model. Substantial improvements in performance are expected with the use of better-optimized shunted junctions, and numerical simulations suggest that, if devices with higher ICRN (critical current-normal state resistance) products can be obtained, Josephson effect mixers could be competitive with SIS mixers at high frequencies.

  17. Pure pancreaticocutaneous fistula shunted into the urinary bladder. Lesson learned by an incomplete, original attempt.

    PubMed

    Violi, Vincenzo; Salvemini, Carlo; Darecchio, Antonio; Detullio, Paolo; Costi, Renato

    2014-01-01

    Because pancreaticocystostomy is a method of exocrine secretion management in pancreas transplantation, a legitimate question is whether a pure pancreatic fistula could be shunted into the bladder. After duodenopancreatectomy for cancer, a pancreaticojejunostomy leakage was treated by pancreas-saving anastomosis disconnection. The resulting pure pancreaticocutaneous fistula was later diverted into the bladder using a Denver valved-pump device. Technical problems necessitated redoing the shunt using a modified technique and device. Although the system did work, catheter displacement outside the bladder finally caused device takedown and external fistula restoration. Our attempt did not succeed mostly because of our inexperience in dealing with an altogether novel issue without appropriate technology. Supposing its feasibility, a pancreatic-bladder shunt might have a role in treating pure pancreatic fistulas or creating an external fistula whenever the pancreatic remnant is unreliable for an anastomosis, or when a leaked anastomosis' disconnection is preferable to completion pancreatectomy. PMID:24833149

  18. Systemic metastasis of medulloblastoma through ventriculoperitoneal shunt: report of a case and critical analysis of the literature.

    PubMed

    Jamjoom, Z A; Jamjoom, A B; Sulaiman, A H; Naim-Ur-Rahman; al Rabiaa, A

    1993-11-01

    An unusual case of medulloblastoma metastasizing through a ventriculoperitoneal shunt to the scrotum in a child with a hydrocele is presented. A review of the literature disclosed 160 cases of medulloblastoma with systemic metastases, 30 (18.7%) of them having undergone systemic shunts. Analysis of the distribution patterns of the metastases in relation to the shunt type revealed that shunts had probably provided the route of systemic spread in no more than 11 cases (6.9%). Only one of these cases had no intracranial tumor at autopsy, suggesting that the outcome was probably worsened by the systemic metastases through the shunt. In contrast, five patients had intraaxial tumor recurrence that largely determined the outcome. In the remaining five cases, information concerning the tumor within the central nervous system was not available, and it remains speculative whether these patients could have survived longer without the shunts. It is concluded that the chance of medulloblastoma metastasizing through cerebrospinal fluid shunt is quite small and has an even smaller chance of adversely affecting the final outcome of the medulloblastoma patient. Consequently, in our opinion there should be no contraindication to precraniotomy shunting if required in such patients. PMID:8211658

  19. Effect of Shunts on Thin-Film CdTe Module Performance. Galymzhan T. Koishiyev, James R. Sites

    E-print Network

    Sites, James R.

    Effect of Shunts on Thin-Film CdTe Module Performance. Galymzhan T. Koishiyev, James R. Sites circuit model is used to analyze the impact of shunts on basic performance parameters of a CdTe thin with each other in their effect on the module. To address these questions, a 2-D circuit model of a CdTe

  20. Control and performance of a fully-digital-controlled shunt active filter for installation on a power distribution system

    Microsoft Academic Search

    Pichai Jintakosonwit; Hideaki Fujita; Hirofumi Akagi

    2002-01-01

    This paper presents a fully-digital-controlled shunt active filter for harmonic termination of a power distribution system. The main purpose of the active filter based on voltage detection is not to compensate for current harmonics but to damp out harmonic propagation caused by line inductors and shunt capacitors for power factor correction. However, time and phase delays inherent in digital controllers

  1. A 6.6kV transformerless shunt hybrid active filter for installation on a power distribution system

    Microsoft Academic Search

    R. Inzunza; H. Akagi

    2005-01-01

    This paper presents a fully-digital-controlled shunt hybrid filter for damping of harmonic propagation in power distribution systems. The harmonic propagation is caused by resonance between line inductances and power capacitors installed for power factor correction. A possible solution to damping out harmonic propagation is based on installation of a shunt pure active filter at the end of a feeder. This

  2. Pseudocysts of the Abdomen Associated with Ventriculoperitoneal Shunts: A Report of Twelve Cases and a Review of the Literature

    Microsoft Academic Search

    Sarah J. Gaskill; Arthur E. Marlin

    1989-01-01

    Shunt complications are reported to occur at a rate of approximately 26%. One of the less frequent but important complications is that of the pseudocyst. Since Harsh’s first mention of a periumbilical cyst associated with a shunt in 1954, 44 cases have been reported in the literature. These are reviewed in addition to 12 cases of our own. From the

  3. GAS CHROMATOGRAPHY-MASS SPECTROMETRY (GC-MS) TECHNIQUES FOR METABOLIC FLUX ANALYSIS OF THE BIFIDO SHUNT PATHWAY

    Technology Transfer Automated Retrieval System (TEKTRAN)

    The presence of the Bifido shunt in Bifidobacterium is predicted to lead to the uptake and metabolic conversion of fructose to acetate. We propose an approach to quantifying the carbon flux through the Bifido shunt by measuring specific **13C-labeled carbohydrate-derived isotopomers by gas chromato...

  4. Electrospun polyurethane as an alternative ventricular catheter and in vitro model of shunt obstruction.

    PubMed

    Suresh, Supraja; Black, Richard A

    2015-02-01

    Intracranial pressure and volume vary considerably between hydrocephalic patients, and with age, health and haemodynamic status; if left untreated, intracranial pressure rises and the ventricular system expands to accommodate the excess cerebrospinal fluid, with significant morbidity and mortality. Cerebrospinal fluid shunts in use today have a high incidence of failure with shunt obstruction being the most serious. Conventional proximal shunt catheters are made from poly(dimethyl)siloxane, the walls of which are perforated with holes for the cerebrospinal fluid to pass through. The limited range of catheters, in terms of material selection and flow distribution, is responsible in large part for their poor performance. In this study, we present an alternative design of proximal catheter made of electrospun polyether urethane, and evaluate its performance in the presence of glial cells, which are responsible for shunt blockage. The viability and growth of cells on catheter materials such as poly(dimethyl)siloxane and polyurethane in the form of cast films, microfibrous mats and porous sponges were studied in the presence of proteins present in cerebrospinal fluid after 48?h and 96?h in culture. The numbers of viable cells on each substrate were comparable to untreated poly(dimethyl)siloxane, both in the presence and absence of serum proteins found in cerebrospinal fluid. A cell culture model of shunt obstruction was developed in which cells on electrospun polyether urethane catheters were subjected to flow during culture in vitro, and the degree of obstruction quantified in terms of hydraulic permeability after static and perfusion culture. The results indicate that a catheter made of electrospun polyether urethane would be able to maintain cerebrospinal fluid flow even with the presence of cells for the time period chosen for this study. These findings have implications for the design and deployment of microporous shunt catheter systems for the treatment of hydrocephalus. PMID:25245779

  5. Coagulation profiles in dogs with congenital portosystemic shunts befoere and after surgical attenuation

    Microsoft Academic Search

    Anne. Kummeling; Erik Teske; Jan Rothuizen; Frederik J. Van Sluijs

    2006-01-01

    Background: Serious postoperative hemorrhage has been reported in dogs after closure of congenital portosystemic shunts\\u000a(CPS).\\u000aHypothesis: In dogs with portosystemic shunting, low coagulation factor activity is responsible for coagulopathy, which can\\u000acause complications after surgery.\\u000aAnimals: Thirty-four dogs with CPS and 39 healthy dogs.\\u000aMethods: In a prospective study, coagulation times, platelet count, and the activity of 8 coagulation

  6. Pancreaticoportal Fistula and Disseminated Fat Necrosis After Revision of a Transjugular Intrahepatic Portosystemic Shunt

    SciTech Connect

    Klein, Seth J., E-mail: kleins@mir.wustl.edu; Saad, Nael [Washington University School of Medicine, Interventional Radiology Section, Mallinckrodt Institute of Radiology (United States)] [Washington University School of Medicine, Interventional Radiology Section, Mallinckrodt Institute of Radiology (United States); Korenblat, Kevin [Washington University School of Medicine, Division of Gastroenterology, Department of Internal Medicine (United States)] [Washington University School of Medicine, Division of Gastroenterology, Department of Internal Medicine (United States); Darcy, Michael D. [Washington University School of Medicine, Interventional Radiology Section, Mallinckrodt Institute of Radiology (United States)] [Washington University School of Medicine, Interventional Radiology Section, Mallinckrodt Institute of Radiology (United States)

    2013-04-15

    A 59-year old man with alcohol related cirrhosis and portal hypertension was referred for transjugular intrahepatic portosystemic shunt (TIPS) to treat his refractory ascites. Ten years later, two sequential TIPS revisions were performed for shunt stenosis and recurrent ascites. After these revisions, he returned with increased serum pancreatic enzyme levels and disseminated superficial fat necrosis; an iatrogenic pancreaticoportal vein fistula caused by disruption of the pancreatic duct was suspected. The bare area of the TIPS was subsequently lined with a covered stent-graft, and serum enzyme levels returned to baseline. In the interval follow-up period, the patient has clinically improved.

  7. Prevention of hydrocephalus shunt catheter colonisation in vitro by impregnation with antimicrobials.

    PubMed Central

    Bayston, R; Grove, N; Siegel, J; Lawellin, D; Barsham, S

    1989-01-01

    A process is described by which hydrocephalus shunt catheters can be impregnated with antimicrobials. The processed catheters showed antimicrobial activity at their surfaces for long periods and could be sterilised by autoclaving. When tested in vitro in a model of catheter colonisation using large challenge doses of Staphylococcus epidermidis and prolonged perfusion, some antimicrobials failed to protect against colonisation whereas others protected against one or two challenges. A combination of rifampicin and clindamycin gave best results, protecting against three successive challenges over a 28 day perfusion period. Resistant organisms did not develop. The process is likely to be useful in prevention of hydrocephalus shunt infection. Images PMID:2732730

  8. Risk factors for first cerebrospinal fluid shunt infection: findings from a multi-center prospective cohort study

    PubMed Central

    Simon, Tamara D.; Butler, Jerry; Whitlock, Kathryn B.; Browd, Samuel R.; Holubkov, Richard; Kestle, John R.W.; Kulkarni, Abhaya V.; Langley, Marcie; Limbrick, David D.; Mayer-Hamblett, Nicole; Tamber, Mandeep; Wellons, John C.; Whitehead, William E.; Riva-Cambrin, Jay

    2014-01-01

    Objective To quantify the extent to which revision(s) of cerebrospinal fluid (CSF) shunt are associated with increased risk of CSF shunt infection, after adjusting for patient factors that may contribute to infection risk. Study design We used the HCRN registry to assemble a large prospective six center cohort of 1,036 children undergoing initial CSF shunt placement between April 2008 and January 2012. The primary outcome of interest was first CSF shunt infection. Data for initial CSF shunt placement and all subsequent CSF shunt revisions prior to first CSF shunt infection, where applicable, were obtained. The risk of first infection was estimated using a multivariable Cox proportional hazard model accounting for patient characteristics and CSF shunt revisions, and is reported using hazard ratios (HR) with 95% confidence intervals (CI). Results Of the 102 children who developed first infection within 12 months of placement, 33 (32%) followed one or more CSF shunt revisions. Baseline factors independently associated with risk of first infection included: gastrostomy tube (HR 2.0, 95% CI: 1.1, 3.3), age 6–12 months (HR 0.3, 95% CI: 0.1, 0.8), and prior neurosurgery (HR 0.4, 95% CI: 0.2, 0.9). After controlling for baseline factors, infection risk was most significantly associated with the need for revision (1 revision vs. none, HR 3.9, 95% CI: 2.2, 6.5; ?2 revisions, HR 13.0, 95% CI: 6.5, 24.9). Conclusions This study quantifies the elevated risk of infection associated with shunt revisions observed in clinical practice. To reduce risk of infection risk further work should optimize revision procedures. PMID:24661340

  9. Optical manipulation of biological particles using LP21 mode in fiber

    NASA Astrophysics Data System (ADS)

    Chen, Shijie; Huang, He; Zou, Hongmei; Li, Qing; Fu, Jian; Lin, Feng; Wu, X.

    2014-12-01

    We demonstrate the optical manipulation of biological particles using a low-order LP21 fiber mode. The focused four-lobed LP21 mode distribution was theoretically and experimentally found to be effective in optical tweezer applications, including selective cellular pick-up, pairing, grouping or separation, as well as rotation of cell dimers and clusters. Our proposed theoretical model estimates both the translational dragging force and rotational torque in good accordance with experimental data. With a simple all-fiber configuration, and low peak irradiation to target bioparticles, the proposed LP21 ‘optical chuck’ system has great application potential in biological test systems.

  10. Acquired Left Atrial-to-Right Ventricular Shunt with Mitral Valve Incompetence

    PubMed Central

    Mohapatra, Srikant; Minhas, Harpreet Singh; Virmani, Sanjula; Mishra, Bana Bihari; Mukherjee, Kaushik; Banerjee, Amit

    2009-01-01

    Acquired left ventricular-to-right atrial communication is encountered periodically. This condition is chiefly attributable to surgical mishaps, trauma, endocarditis, or endomyocardial biopsy. In a few instances, a Gerbode-like defect develops after the repair of an atrioventricular septal defect. Our search of the worldwide medical literature revealed just 1 report of a “mirror” occurrence of a Gerbode-like defect: a shunt between the left atrium and the right ventricle. Herein, we present the case of a 22-year-old woman who had severe mitral valve incompetence accompanying an acquired shunt between the left atrium and the right ventricle—a late sequela of the earlier repair of an atrioventricular septal defect. After surgical correction of the shunt and the associated mitral incompetence, the patient experienced a good outcome. Echocardiographic and intraoperative findings are presented, along with a plausible explanation for the mechanism and presentation of the condition in our patient. To our knowledge, this is only the 2nd report of an acquired shunt between the left atrium and the right ventricle, and the 1st such case to be accompanied by severe mitral valve incompetence. PMID:19436792

  11. Effect of portacaval shunt on biliary cholesterol and bile salt secretion in normal rats.

    PubMed

    Bützow, G H; Dammann, H G; Czok, G

    1978-12-01

    In order to assess the role of bile secretion in the serum cholestrol lowering effect of a portacaval anastomosis in rats, bile flow rate, bile salt and cholesterol secretion in bile were determined. The study comprised five groups of animals: (1) rats with protacaval shunt cholesterol free food ad libitum. (2) sham-operated and pair-fed controls; (3) unoperated, pair-fed controls; (4) unoperated controls on cholesterol free diet ad libitum; and (5) unoperated controls on normal laboratory rat chow ad libitum. Bile flow rate showed no difference in any of the groups on cholesterol free diet. Bile salt secretion was significantly elevated in shunted animals (87.1 +/- 7.0 nmol/min) as compared with pair-fed sham-operated (64.7 +/- 20.0 nmol/min) and unoperated controls (56.0 +/- 22.3 nmol/min). Biliary cholesterol output tended to be higher in shunted animals but this was not statistically significant. The data indicate that the atrophied rat liver in shunted animals is able to maintain a normal bile flow and to increase bile salt secretion. Thus, the serum cholesterol lowering action of a portocaval anastomosis may be partly due to an increased cholesterol catabolism to bile salts. PMID:105914

  12. FPGA-based real time current sensor failure diagnosis for shunt active power filters

    Microsoft Academic Search

    Shahram Karimi; Philippe Poure; Shahrokh Saadate

    2009-01-01

    The performances of conventional shunt active power filters heavily depend on accurate active filter current sensing. A sudden failure in one of the active filter current sensors decreases the filter performances. Moreover, if the fault is not detected and compensated for quickly, its effect leads to disconnection or hard failure of the active filter. Hence, to reduce the failure rate

  13. Tube shunt coverage with gamma-irradiated cornea allograft (VisionGraft)

    PubMed Central

    Ekici, Feyzahan; Moster, Marlene R; Cvintal, Victor; Hu, Wanda D; Waisbourd, Michael

    2015-01-01

    Purpose To investigate the clinical outcomes of tube shunt coverage using sterile gamma-irradiated cornea allograft. Patients and methods The Wills Eye Hospital Glaucoma Research Center retrospectively reviewed the medical records of 165 patients who underwent glaucoma tube shunt procedures using sterile gamma-irradiated cornea allograft (VisionGraft) between December 2012 and November 2013. Demographic characteristics, type of tube shunt, and position were noted. Complications were recorded at 1 day; 1 week; 1, 3, 6, and 12 months; and on the final postoperative visit. Results One hundred and sixty-nine eyes of 165 patients were included. The mean follow-up time was 4.8±3.5 (ranging from 1 to 16) months. There was no evidence of immunological reaction, infection, or exposure in 166 eyes (98.2%). Three eyes (1.8%) experienced graft or tube exposure within the first 3 postoperative months. Two of the cases had underlying diseases: bullous pemphigoid and chronic allergic conjunctivitis. Conclusion Coverage of tube shunts using gamma-irradiated cornea allograft had a low exposure rate and was well tolerated. The graft can be stored long term at room temperature and has an excellent postoperative cosmetic appearance. PMID:25995612

  14. Evaluation of MR/Fluoroscopyguided Portosystemic Shunt Creation in a Swine Model

    E-print Network

    Atalar, Ergin

    Evaluation of MR/Fluoroscopy­guided Portosystemic Shunt Creation in a Swine Model Aravind Arepally and fluoroscopy guidance in a swine model. MATERIALS AND METHODS: In stage 1 of the experiment, an active MR (IVC)/superior mesenteric vein (SMV)/portal vein (PV) punctures were performed in 10 swine (weight, 40

  15. Variable hysteresis current control applied in a shunt active filter with constant switching frequency

    Microsoft Academic Search

    H. Vahedi; A. Sheikholeslami

    2010-01-01

    Presence of harmonics in power networks makes it inevitable to use power filters. Shunt active power filters (APF) are widely used in power systems to eliminate the current harmonics and to compensate reactive power due to their accurate and fast operation. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band

  16. Transjugular Intrahepatic Portosystemic Shunt Placement in Patients with Cirrhosis and Concomitant Portal Vein Thrombosis

    SciTech Connect

    Ha, Thuong G. Van, E-mail: tgvanha@radiology.bsd.uchicago.edu; Hodge, Justin; Funaki, Brian; Lorenz, Jonathan; Rosenblum, Jordan; Straus, Christopher; Leef, Jeff [University of Chicago, Department of Radiology, Section of Interventional Radiology (United States)

    2006-10-15

    Purpose. To determine the safety and efficacy of transjugular intrahepatic portosystemic shunt (TIPS) creation in patients with liver cirrhosis complicated by thrombosed portal vein. Methods. This study reviewed 15 cases of TIPS creation in 15 cirrhotic patients with portal vein thrombosis at our institution over an 8-year period. There were 2 women and 13 men with a mean age of 53 years. Indications were refractory ascites, variceal hemorrhage, and refractory pleural effusion. Clinical follow-up was performed in all patients. Results. The technical success rate was 75% (3/4) in patients with chronic portal vein thrombosis associated with cavernomatous transformation and 91% (10/11) in patients with acute thrombosis or partial thrombosis, giving an overall success rate of 87%. Complications included postprocedural encephalopathy and localized hematoma at the access site. In patients with successful shunt placement, the total follow-up time was 223 months. The 30-day mortality rate was 13%. Two patients underwent liver transplantation at 35 days and 7 months, respectively, after TIPS insertion. One patient had an occluded shunt at 4 months with an unsuccessful revision. The remaining patients had functioning shunts at follow-up. Conclusion. TIPS creation in thrombosed portal vein is possible and might be a treatment option in certain patients.

  17. Mass screening of Irish wolfhound puppies for portosystemic shunts by the dynamic bile acid test.

    PubMed

    Kerr, M G; van Doorn, T

    1999-06-19

    Five hundred and sixty-six Irish wolfhound puppies aged six to 15 weeks were tested for congenital portosystemic shunts by the dynamic bile acid method. Plasma ammonia concentration was also measured in 165 of the puppies both fasting and postprandially. Nineteen puppies (3.4 per cent), nine males and 10 females, had portosystemic shunts. Smaller litters appeared to be more likely to contain affected puppies. The postprandial bile acid concentration was a reliable predictor of the presence of a shunt, with the highest concentration in a normal puppy being 38 mumol/litre and the lowest in an affected puppy being 43 mumol/litre. In contrast, fasting bile acid concentrations were normal in the majority of the affected puppies. There was considerable overlap in fasting plasma ammonia concentrations between normal and affected puppies (26 puppies, 15.8 per cent of those tested). Postprandial ammonia concentration appeared to give better separation between the two groups, apart from two individuals which produced bizarre results. It was concluded that the postprandial or dynamic bile acid test is an appropriate test for the mass screening of Irish wolfhound puppies for portosystemic shunts, and guidelines are proposed for the interpretation and follow-up of the test. PMID:10420483

  18. Laser restoration of flow in occluded ventricular shunts for pediatric neurosurgery

    NASA Astrophysics Data System (ADS)

    Christens-Barry, William A.; Guarnieri, Michael; Carson, Benjamin S.

    1998-01-01

    We have investigated the use of short pulses of infrared ((lambda) equals 2.09 micrometers ) light from a Ho:YAG laser to photofragment occlusions and restore flow in ventricular shunts, which provide the sole means of maintaining proper intracranial pressure in hydrocephalus patients. These experiments employed model tissues, a polymeric model compound, and patient explants in order to determine appropriate pulse energies and delivery rates for removal of occlusions material. Laser energy doses and rates of occlusion removal were established for these materials. Laser energy doses that do not damage the shunt device or surrounding tissue were identified. Optical fibers (25 ga. or smaller) can be introduced through the dome of current shunt devices and threaded to the occlusion site. Clinical application will require the continued development of an introducer tool for the transcutaneous insertion of the optical fiber into the shunt device and irrigation techniques for removing the occlusion detritus generated by photofragmentation treatment. Using this approach, a minimally invasive and benign procedure for in situ restoration of flow in occluded neurological implant devices becomes possible.

  19. Effects of Quaternary Ammonium Silane Coatings on Mixed Fungal and Bacterial Biofilms on Tracheoesophageal Shunt Prostheses

    Microsoft Academic Search

    Janine J. H. Oosterhof; Kevin J. D. A. Buijssen; Henk J. Busscher; Bernard F. A. M. van der Laan; Henny C. van der Mei

    2006-01-01

    Two quaternary ammonium silanes (QAS) were used to coat silicone rubber tracheoesophageal shunt prostheses, yielding a positively charged surface. One QAS coating ((trimethoxysilyl)-propyldimethylocta- decylammonium chloride) was applied through chemical bonding, while the other coating, Biocidal ZF, was sprayed onto the silicone rubber surface. The sprayed coating lost its stability within an hour, while the chemically bonded coating appeared stable. Upon

  20. Surgical attenuation of congenital portosystemic shunts in dogs. Techniques, complications and prognosis

    Microsoft Academic Search

    A. Kummeling

    2009-01-01

    The general aim of this thesis was to identify factors associated with outcome after surgical attenuation of congenital portosystemic shunts (CPSS) in dogs and to clarify underlying mechanisms of postoperative recovery in this disease. Two surgical techniques used for CPSS attenuation, ligation and cellophane banding, were evaluated in 97 and 106 dogs, respectively. Cellophane banding resulted in less short-term complication

  1. Analysis and design of a three phase sliding mode controller for a shunt active power filter

    Microsoft Academic Search

    V. Cardenas; N. Viizquez; C. Hernandez; S. Horta

    1999-01-01

    In this paper a three-phase sliding mode controller for a shunt active power filter is presented; analysis, design, simulation and experimental results are included. The sliding mode controller proposed is a three phase controller that considers the overall system, and the loop to regulate the capacitor voltage is added to the sliding mode control strategy. The instantaneous reactive power theory

  2. Computer simulation of magnetization-controlled shunt reactors for calculating electromagnetic transients in power systems

    SciTech Connect

    Karpov, A. S. [St Petersburg State Polytechnical University, JSC 'System Operator of the United Power System', Leningradskoe RDU (Russian Federation)] [St Petersburg State Polytechnical University, JSC 'System Operator of the United Power System', Leningradskoe RDU (Russian Federation)

    2013-01-15

    A computer procedure for simulating magnetization-controlled dc shunt reactors is described, which enables the electromagnetic transients in electric power systems to be calculated. It is shown that, by taking technically simple measures in the control system, one can obtain high-speed reactors sufficient for many purposes, and dispense with the use of high-power devices for compensating higher harmonic components.

  3. Detection of Right-to-Left Shunt with Ultrasound Contrast Agent and Transcranial Doppler Sonography

    Microsoft Academic Search

    M. Jauss; E. Zanette

    2000-01-01

    An international Consensus Meeting to determine a standard in the examination technique for the detection of right-to-left shunt (RLS) using contrast transcranial Doppler sonography (TCD) led to the following recommendations to standardize the examination procedure: The patient should be prepared with an 18-gauge needle inserted into the cubital vein and should be in the supine position. Insonation of at least

  4. Negative capacitance shunt damping system with optimized characteristics for use with piezoelectric transducers

    NASA Astrophysics Data System (ADS)

    Pohl, Martin

    2014-03-01

    For ecologic sustainability and decreasing reserves of fossile energy sources, fuel efficiency is a major concern especially for passenger aircraft. Therefore, lightweight structures made from carbon fiber plastics offer great potential. But when used for panel-like structures, they have the disadvantage of lower damping and coincidence frequencies compared to conventional differential metal constructions. Both aspects lead to an increased vibration level and by this a higher noise radiation. Because of this, special noise and vibration treatment is needed to ensure passenger cabin comfort. Besides passive damping and active structural acoustic control (ASAC), piezoelectric shunt damping is investigated. Due to its broadband performance, the negative capacitance shunt can be used for multimode systems with varying eigenfrequencies. These shunts are usually built with operational amplifiers and passive components as resistors and capacitors. This setup is sufficient for laboratory tests at low excitation levels. In fact, it is not capable of accessing the full voltage amplitude of common piezoelectric transducers, because most operational amplifiers only deliver +/-15V maximum output voltage. Therefore an improved setup is presented in this paper, which addresses the specific voltage requirements of a common piezoelectric transducer to achieve best performance. It comprises a tailored power source and an appropriate concept for the negative capacitance shunt hardware. This new hardware only uses standard operational amplifiers together with a high voltage power amplifier to cover the whole operating range of a piezoelectric transducer. A demonstrator board is developed and experimentally investigated at a test structure. Finally, the results are compared to a conventional setup.

  5. Usefulness of central venous oxygen saturation monitoring during bidirectional Glenn shunt.

    PubMed

    Kakuta, Nami; Kawahito, Shinji; Mita, Naoji; Kambe, Noriko; Kasai, Asuka; Wakamatsu, Narutomo; Katayama, Toshiko; Soga, Tomohiro; Tada, Fumihiko; Kitaichi, Takashi; Kitagawa, Tetsuya; Kitahata, Hiroshi

    2013-01-01

    A PediaSat™ oximetry catheter (PediaSat: Edwards Lifesciences Co., Ltd., Irvine, CA, U. S. A.), which facilitates continuous measurement of central venous oxygen saturation (ScvO2), may be useful for surgery for pediatric congenital heart disease. We used PediaSat during a bidirectional Glenn shunt. The patient was a 13-month-old boy. Under a diagnosis of left single ventricle (pulmonary atresia, right ventricular hypoplasia, atrial septal defect) and residual left aortic arch/left superior vena cava, a modified right Blalock-Taussig shunt was performed. Cyanosis deteriorated, so a bidirectional Glenn shunt was scheduled. After anesthesia induction, a 4.5 Fr double-lumen (8 cm) PediaSat was inserted through the right internal jugular vein for continuous ScvO2 monitoring. Furthermore, the probe of a near-infrared, mixed blood oxygen saturation-measuring monitor was attached to the forehead for continuous monitoring of the regional brain tissue mixed blood oxygen saturation (rSO2) (INVOS™ 5100C, Covidien; Boulder, CO, U. S. A.). Blockage of the right pulmonary artery and right superior vena cava decreased the oxygen saturation, ScvO2, and rSO2, but increased the central venous pressure. Although changes in ScvO2 were parallel to those in rSO2, the former showed more marked changes. A combination of ScvO2 and rSO2 for monitoring during Glenn shunt may be safer. PMID:24190047

  6. Bladder calculus formation on the tip of a migrated disused ventriculoperitoneal shunt.

    PubMed

    Butler, Laura; Keys, Charles; Lam, Jimmy P H

    2013-05-01

    Bladder stones in children are rare. They generally occur in children with one or more predisposing risk factors to stone formation. In this unique case report we discuss the formation and successful endoscopic treatment of a large stone in a neuropathic bladder on the tip of a migrated VP shunt. PMID:23701800

  7. Effect of cell phone magnetic fields on adjustable cerebrospinal fluid shunt valves

    Microsoft Academic Search

    Sadahiro Nomura; Hirosuke Fujisawa; Michiyasu Suzuki

    2005-01-01

    The rapid increase in the number of cell phone users has led to the suggestion that electromagnetic waves might affect medical devices. Cerebrospinal fluid shunt valves contain a magnetic device to allow the intracranial pressure setting to be adjusted transcutaneously. Among the valves tested, the settings of the Strata valve, the Hakim valve, and the Sophy valve were affected by

  8. Comparison of models for subtractive and shunting lateral-inhibition in receptor-neuron fields

    Microsoft Academic Search

    G. G. Furman; Murray Hi

    1965-01-01

    Two types of neuronal lateral inhibition in one-dimensional fields of receptors and neurons are considered. The first type, which has been demonstrated in the eye of Limulus, is called subtractive inhibition (SI): it assumes that neuronal activity depends on the difference between the total excitation and inhibition. The second type is called shunting inhibition (SHI): it assumes that inhibitory influences

  9. Thromboembolization associated with sudden increases in flow in a coronary stent ex vivo shunt model.

    PubMed

    Sukavaneshvar, S; Zheng, Y; Rosa, G M; Mohammad, S F; Solen, K A

    2000-01-01

    To observe the dynamics of thromboembolism (TE) in an animal model, a carotid-carotid arterial ex vivo shunt was developed. A coronary stent deployed in a 3.5 mm polyvinylchloride (PVC) tubing segment was used as a model device in the shunt. A light-scattering microemboli detector monitored the embolic content of the blood flowing through the shunt at 50-150 ml/min as determined by a clamp-on ultrasound flow probe. The stent was found to actively develop thrombi and release emboli for 1-3 hours when the activated clotting time (ACT) was maintained between 125 and 150 seconds. The shunt flow rate fluctuated considerably (from 50 to 150 ml/min) depending on the animal's activity. When the time profile of this fluctuating flow rate was super imposed on the time profile of embolization, it was noted that sudden increases in flow rate were associated with incidents of embolization. Statistically, sudden flow rate increases of 100% or more were accompanied by embolic events 95% of the time (p < 0.01). Based on the results of this study, it was postulated that the increased embolization may be due to the fluid forces associated with accelerating flow. To explore this postulate, in vitro studies were conducted to compare the effects of pulsatile flow with steady flow on stent induced TE. Results of this study suggested a significant increase (100%) in both stent thrombosis and embolism during pulsatile flow compared with steady flow. PMID:10826741

  10. Optimum Number, Location, and Size of Shunt Capacitors in Radial Distribution Feeders A Dynamic Programming Approach

    Microsoft Academic Search

    HERNANDO DURAN

    1968-01-01

    A new method is described which determines the optimum number, location, and size of shunt capacitors in a radial distribution feeder with discrete lumped loads so as to maximize overall savings, including the cost of capacitors. The method also determines when capacitors are not economically justified. Dynamic programming techniques are used and several algorithms developed to obtain the optimal solution

  11. Reversed shunting across the ductus arteriosus or atrial septum in utero heralds severe congenital heart disease

    Microsoft Academic Search

    Richard A. Berning; Norman H. Silverman; Maria Villegas; David J. Sahn; Gerard R. Martin; Mary Jo Rice

    1996-01-01

    Objectives. This study was performed to define the significance of Doppler color flow mapping in demonstrating reversal of the direction of the normal physiologic flow across the atrial septum and ductus arteriosus in the human fetus.Background. Reversal of the physiologic shunting across the ductus arteriosus or atrial septum in utero (i.e., left to right) can be readily identified by Doppler

  12. Reduced Skin Capillary Density During Attacks of Erythromelalgia Implies Arteriovenous Shunting as Pathogenetic Mechanism

    Microsoft Academic Search

    Cato Mørk; Knut Kvernebo; Claes L. Asker; E. Goran Salerud

    2002-01-01

    Erythromelalgia is characterized by burning pain, erythema, and increased temperature in acral skin. The pain is aggravated by warming and relieved by cooling. Increased microvascular arteriovenous shunting in deep dermal plexa has been hypothesized as the pathogenetic mechanism of pain in affected skin, inducing hypoxia during pain attacks. The aim of this study was to quantify skin capillary density in

  13. Endolymphatic mastoid shunt versus endolymphatic sac decompression for ménière’s disease

    Microsoft Academic Search

    George M. Brinson; Douglas A. Chen; Moises A. Arriaga

    2004-01-01

    Objectives: This study compares the efficacy of endolymphatic mastoid shunt (EMS) versus endolymphatic sac decompression (ESD) without sac incision.Methods: The AAO-HNS Guidelines for the Diagnosis and Evaluation of Therapy in Ménière’s disease were used to identify suitable candidates for the study. All patients who failed medical management and underwent either EMS (n = 91) or ESD (n = 107) were

  14. Interference of Descemet's Membrane with Aqueous Humor Drainage via an ExPRESS Mini Shunt

    PubMed Central

    Tamaki, Rikiya; Zako, Masahiro

    2014-01-01

    Purpose To describe a case in which Descemet's membrane interfered with aqueous humor drainage through an ExPRESS mini shunt. This problem was successfully solved by Nd:YAG laser membranotomy. Case Report A 70-year-old male, diagnosed with corticosteroid-induced glaucoma in his right eye, presented to our hospital. Topical betamethasone treatment was discontinued, and the patient was treated with intravenous D-mannitol and acetazolamide, followed by oral acetazolamide, oral potassium L-aspartate, topical dorzolamide hydrochloride, topical carteolol hydrochloride, and topical latanoprost. However, his right intraocular pressure (IOP) remained elevated. We performed ExPRESS shunt surgery in the patient's right eye. His postoperative IOP was initially within the normal range, but it reincreased 1 month after surgery. We found that the Descemet's membrane was interfering with both the primary (axial) and reserve orifices at the tip of the ExPRESS mini shunt. Nd:YAG laser membranotomy was performed and the patient's IOP again improved without any other medical treatment. Conclusion Descemet's membrane interfered with aqueous humor drainage via ExPRESS mini shunt, causing an increased IOP, which was resolved by Nd:YAG laser membranotomy. PMID:25473402

  15. Racial and socioeconomic disparities in outcomes following pediatric cerebrospinal fluid shunt procedures.

    PubMed

    Attenello, Frank J; Ng, Alvin; Wen, Timothy; Cen, Steven Y; Sanossian, Nerses; Amar, Arun P; Zada, Gabriel; Krieger, Mark D; McComb, J Gordon; Mack, William J

    2015-06-01

    OBJECT Racial and socioeconomic disparities within the US health care system are a growing concern. Despite extensive research and efforts to narrow such disparities, minorities and economically disadvantaged patients continue to exhibit inferior health care outcomes. Disparities in the delivery of pediatric neurosurgical care are understudied. Authors of this study examine the impact of race and socioeconomic status on outcomes following pediatric CSF shunting procedures. METHODS Discharge information from the 2000, 2003, 2006, and 2009 Kids' Inpatient Database for individuals (age < 21 years) with a diagnosis of hydrocephalus who had undergone CSF shunting procedures was abstracted for analysis. Multivariate logistic regression analyses, adjusting for patient and hospital factors and annual CSF shunt procedure volume, were performed to evaluate the effects of race and payer status on the likelihood of inpatient mortality and nonroutine hospital discharge (that is, not to home). RESULTS African American patients (p < 0.05) had an increased likelihood of inpatient death and nonroutine discharge compared with white patients. Furthermore, Medicaid patients had a significantly higher likelihood of nonroutine discharge (p < 0.05) as compared with privately insured patients. CONCLUSIONS Findings in this study, which utilized US population-level data, suggest the presence of racial and socioeconomic status outcome disparities following pediatric CSF shunting procedures. Further studies on health disparities in this population are warranted. PMID:25791773

  16. Unilateral hearing loss following shunt placement for normal pressure hydrocephalus with a unilateral patent cochlear aqueduct

    Microsoft Academic Search

    Sun-Ho Lee; Seong-Hyun Park; Sung-Kyoo Hwang

    2007-01-01

    Hearing loss in patients who have undergone shunt placement for a hydrocephalus is perhaps an underestimated complication rather than a rare event. There appears to be a correlation between the occurrence of hearing loss and patient characteristics consistent with excessive drainage of cerebrospinal fluid (CSF) and patent cochlear aqueduct (CA). We present the case of a 77-year-old man with unilateral

  17. The C-shunt Flux Qubit: A New Generation of Superconducting Flux Qubit

    NASA Astrophysics Data System (ADS)

    Birenbaum, Jeffrey Scott

    While quantum computation has the potential to revolutionize the scientific community, to date no architecture has been developed which offers the necessary combination of high coherence times and massive scalability. Superconducting flux qubits satisfy the second requirement well but to date useful devices are limited to coherence times of typically only a few mus. In this dissertation we examine the possibilities of improving the coherence performance of the flux qubit to the levels required for fault-tolerant quantum computation. We find that coherence times for many devices are limited by photon-induced quasiparticles and mitigation of these quasiparticles increases coherence times by more than a factor of two. Beyond this, however, we find little improvement in flux qubit performance compared to prior results. Despite improved fabrication techniques and varied device designs we find flux qubit coherence times are still typically below 5 mus. Furthermore, wide device-to-device variations are observed which prevent effective scaling of the flux qubit to quantum information circuits. Based on the proposal by You, et al. we develop of a capacitively-shunted version of the flux qubit called the C-shunt flux qubit. With the addition of a capacitive shunt across the small junction of the flux qubit we are able to reduce the amplitude sensitivity to both charge and flux noise by more than a factor of three. The result is a predicted ten-fold enhancement in the coherence times compared to the unshunted flux qubit. At the same time we preserve much of the anharmonicity of the flux qubit resulting in a device with coherence times comparable to modern transmons but with a factor of four better anharmonicity and more flexible coupling configurations. By using a high-quality MBE aluminum shunt process on an annealed sapphire substrate coupled with a more conventional electron-beam-evaporated aluminum Josephson junction process we fabricate hybrid C-shunt flux qubits. We also incorporate a new bridgeless junction technique which offers more robust and repeatable fabrication processing. This technique enables improved accuracy of the junction sizing, a trait which will become essential as we move to multi-qubit experiments. T1 and T2 times for these C-shunt devices reach in excess of 40 mus at degeneracy, achieving the predicted ten-fold improvement based on the reduced noise sensitivity. At the same time we see decreased device-to-device variation with typical T1 times exceeding 20--25 mus at all bias points. Combined with the high anharmonicity and standard planar fabrication techniques these coherence times make the C-shunt flux qubit a competitive candidate for fault-tolerant quantum computation.

  18. Piezoelectric Shunt Vibration Damping of F-15 Panel under High Acoustic Excitation

    NASA Technical Reports Server (NTRS)

    Wu, Shu-Yau; Turner, Travis L.; Rizzi, Stephen A.

    2000-01-01

    At last year's SPIE symposium, we reported results of an experiment on structural vibration damping of an F-15 underbelly panel using piezoelectric shunting with five bonded PZT transducers. The panel vibration was induced with an acoustic speaker at an overall sound pressure level (OASPL) of about 90 dB. Amplitude reductions of 13.45 and 10.72 dB were achieved for the first and second modes, respectively, using single- and multiple-mode shunting. It is the purpose of this investigation to extend the passive piezoelectric shunt-damping technique to control structural vibration induced at higher acoustic excitation levels, and to examine the controllability and survivability of the bonded PZT transducers at these high levels. The shunting experiment was performed with the Thermal Acoustic Fatigue Apparatus (TAFA) at the NASA Langley Research Center using the same F-15 underbelly panel. The TAFA is a progressive wave tube facility. The panel was mounted in one wall of the TAFA test section using a specially designed mounting fixture such that the panel was subjected to grazing-incidence acoustic excitation. Five PZT transducers were used with two shunt circuits designed to control the first and second modes of the structure between 200 and 400 Hz. We first determined the values of the shunt inductance and resistance at an OASPL of 130 dB. These values were maintained while we gradually increased the OASPL from 130 to 154 dB in 6-dB steps. During each increment, the frequency response function between accelerometers on the panel and the acoustic excitation measured by microphones, before and after shunting, were recorded. Good response reduction was observed up to the 148dB level. The experiment was stopped at 154 dB due to wire breakage from vibration at a transducer wire joint. The PZT transducers, however, were still bonded well on the panel and survived at this high dB level. We also observed shifting of the frequency peaks toward lower frequency when the OASPL was increased. Detailed experimental results will be presented.

  19. 77 FR 26585 - Steel Partners Holdings L.P.; Notice of Application

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-05-04

    ...Steel Partners Holdings L.P. (``SPH'') requests an order under section 6...be deemed to be an investment company. SPH also seeks an order under section 45(a...Supplemental Material''). Applicant: SPH. Filing Dates: The application was...

  20. IMPROVED IDENTIFICATION OF IRIS AND EYELASH FEATURES Richard Youmaran, L.P. Xie and Andy Adler

    E-print Network

    Adler, Andy

    IMPROVED IDENTIFICATION OF IRIS AND EYELASH FEATURES Richard Youmaran, L.P. Xie and Andy Adler Carleton University, Ottawa, Ontario adler@sce.carleton.ca ABSTRACT This paper proposes a novel algorithm

  1. Absence of involvement of nitric oxide in LP-BM5-induced immunodeficiency syndrome.

    PubMed

    Akarid, K; Chenais, B; Chau, F; Sinet, M; Desforges, B; Gougerot-Pocidalo, M A

    1996-09-01

    To examine the role of nitric oxide (NO) in murine AIDS (MAIDS) pathogenesis, we determined NO production and inducible NOS (iNOS) mRNA expression in the macrophages of LP-BM5-infected mice, together with the in vivo effects of L-NAME, a competitive inhibitor of NO synthase. LP-BM5 infection induced neither spontaneous nitrite production nor iNOS mRNA expression. No differences in IFN gamma + LPS-induced nitrite production or iNOS mRNA expression were observed in macrophages, from non-infected or infected mice. Spleen weight, ecotropic MuLV replication, the blood lymphocyte phenotype and proliferative response of splenocytes were not modified by L-NAME. LP-BM5 infection did not increase macrophage NO production and NO production did not appear to protect against LP-BM5-induced immunodeficiency. PMID:8880143

  2. 75 FR 38514 - Application to Export Electric Energy; Brookfield Energy Marketing LP

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-02

    ...EA-368] Application to Export Electric Energy; Brookfield Energy Marketing...applied for authority to transmit electric energy from the United States to Canada...LP for authority to transmit electric energy from the United States to...

  3. 76 FR 65717 - Erie Boulevard Hydropower, L.P.; Notice of Availability of Environmental Assessment

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-24

    ...DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Project No. 2713-082-New York] Erie Boulevard Hydropower, L.P.; Notice of Availability of Environmental Assessment In accordance with the National Environmental Policy Act...

  4. 76 FR 46287 - Erie Boulevard Hydropower, L.P.; Notice of Availability of Environmental Assessment

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-02

    ...DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Project No. 2047-049] Erie Boulevard Hydropower, L.P.; Notice of Availability of Environmental Assessment In accordance with the National Environmental Policy Act...

  5. 78 FR 66758 - Accreditation and Approval of Saybolt, LP, as a Commercial Gauger

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-06

    ...LP, has been approved to gauge petroleum and petroleum products for customs purposes for the next three years as...FL, has been approved to gauge petroleum and petroleum products for customs purposes, in accordance with the...

  6. 77 FR 50145 - Approval of Saybolt LP, as a Commercial Gauger

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-20

    ...19 CFR 151.13, Saybolt LP, 120 West Highway 30, Gonzales, LA 70737, has been approved to gauge petroleum, petroleum products, organic chemicals and vegetable oils for customs purposes, in accordance with the provisions of 19 CFR...

  7. Lp stability of solutions of Boltzmann equation with external force in soft potentials

    NASA Astrophysics Data System (ADS)

    Cheng, Chi Honn

    2010-07-01

    In this paper, we present a uniform Lp stability theory for the solutions to Boltzmann equation with small or large external forces in vacuum in soft potentials. We assume that the initial data are sufficiently small and a fast decay in space and velocity. Our stability analysis is divided into two parts. For small external forces, we first consider the time derivative of the pth power of Lp norm of the distance between two mild solutions f and g, then define nonlinear functionals, and apply the Grönwall's inequality to obtain the Lp stability. For large external forces, we make use of the constructive assumptions on external force, Minkowski's inequality, and Grönwall's inequality to derive the Lp stability estimate.

  8. 77 FR 74658 - Texas Eastern Transmission, LP; Notice of Technical Conference

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-17

    ...LP; Notice of Technical Conference The Commission's November...in the above-captioned proceeding \\1\\ directed that a technical conference be held to address issues...notice that a technical conference will be held on...

  9. Characterization of LpGPAT gene in Lilium pensylvanicum and response to cold stress.

    PubMed

    Sun, Shao-kun; Yang, Ni-na; Chen, Li-jing; Irfan, Muhammad; Zhao, Xing-hua; Li, Tian-lai

    2015-01-01

    LpGPAT was obtained from L. pensylvanicum using RT-PCR and rapid amplification of cDNA ends. The cloned full-length cDNA was 1544?bp; it encoded 410 amino acids and had a molecular size of 46?KDa. The nucleic acid sequence analysis showed that it shared high homology with other known GPATs. SMAT result suggests that there is a PlsC that exists in 176-322 amino acid sequence of LpGAPT; it means LpGPAT protein is a member of the family of acyltransferase and has acyltransferase enzymatic activity. Result of real-time quantitative PCR and semiquantitative PCR support LpGPAT gene is definitely induced by low temperature stress. PMID:25710023

  10. Lp regularization for early gate fluorescence molecular tomography

    PubMed Central

    Zhao, Lingling; Yang, He; Cong, Wenxiang; Wang, Ge; Intes, Xavier

    2014-01-01

    Time domain fluorescence molecular tomography (TD-FMT) provides a unique dataset for enhanced quantification and spatial resolution. The time-gate dataset can be divided into two temporal groups around the maximum counts gate, which are early gates and late gates. It is well established that early gates allow for improved spatial resolution and late gates are essential for fluorophore unmixing and concentration quantification. However, the inverse problem of FMT is ill-posed and typically underdetermined, which makes image reconstruction highly susceptible to data noise. More specifically, photon counts are inherently very low at early gates due to high absorption and scattering of tissue, resulting in a low signal-to-noise ratio and unstable reconstructions. In this work, an Lp regularization-based reconstruction algorithm was developed and tested with our wide-field mesh-based Monte Carlo simulation strategy. We compared the early time-gate reconstructions obtained with the different p (p ? {1/16, 1/8, 1/4, 1/3, 1/2, 1, 2}) from a synthetic murine model simulating the fluorophore uptake in the kidneys and preclinical data. The results from a 3D mouse atlas and a mouse experiment show that our L1/4 regularization methods give the best performance for early time gates reconstructions. PMID:25121675

  11. Global Measurement of Junge Layer Stratospheric Aerosol with OMPS/LP. Scattering Properties and Particle Size

    NASA Astrophysics Data System (ADS)

    Rault, D. F.; Bhartia, P. K.

    2014-12-01

    The OMPS/LP was launched on board the NPP space platform in October 2011. Over the past two years, the OMPS/LP was used to retrieve the global distribution of ozone and aerosol. The paper will describe the aerosol product, which NASA is presently preparing for public release. The current OMPS/LP aerosol product consists of latitude-altitude curtains along the NPP Sun-synchronous orbit, from cloud top to about 40 km. These curtains extend from local sunrise in Southern polar region to local sunset in Northern polar region. Aerosol extinctions are produced at five distinct wavelengths, namely 513, 525, 670, 750 and 870 nm, with a sampling of 1 km in vertical direction and 1 degree latitude in the along-track direction. The OMPS/LP aerosol dataset is fairly large, with 7000 vertical profiles produced each day for each wavelength. The aerosol product will be presented in terms of extinction monthly median values and mean Angstrom coefficient (particle size). Over the past two years, the Junge layer was affected by several events such as volcanic eruptions (Nabro and Kelut) and a meteor (Chelyabinsk), the effects of which are clearly visible in the OMPS/LP dataset. The Asian Tropopause Aerosol Layer (ATAL) can also be observed in the OMPS/LP dataset. Moreover the effect of the Brewer Dobson Circulation (BDC) can be observed at high altitudes: the BDC velocity at 35 km can be estimated from the time variation of iso-density heights and was found to compare well with BDC velocities evaluated with the water vapor tape recorder technique as well as MERRA model values. Finally, aerosol filaments are clearly visible in OMPS/LP aerosol dataset as they appear as distinct "bubbles" on the OMPS/LP curtain files at periodic intervals in both the Southern and Northern hemispheres. These filaments are a main source of transport from tropical to polar region, and OMPS/LP data can therefore be instrumental in quantifying the rate of this transport. The quality of the OMPS/LP aerosol product is being assessed by comparison with correlative measurements made by CALIPSO, OSIRIS and GOMOS. Statistical comparisons between OMPS/LP and other sensors show mean bias of less than 7% with an ensemble variance of 20-30%.

  12. Reduced clearance of proteins labeled with diisopropylfluorophosphate in portacaval-shunted rats.

    PubMed

    Dienel, Gerald A; Cruz, Nancy F

    2014-12-01

    Portacaval shunting is a model for hepatic encephalopathy that causes chronic hyperammonemia, disruption of metabolic, signaling, and neurotransmitter systems, and progressive morphological changes. Exposure of cultured cells to ammonia raises intralysosomal pH and inhibits proteolysis, and the present study tested the hypothesis that proteolytic capacity is diminished in portacaval-shunted rats. Proteins were labeled in vivo with tracer doses of diisopropylfluorophosphate (DFP) and clearance of label was assayed. This approach labeled proteins independent of protein synthesis, which is reported to be altered in shunted rats, and avoided complications arising from re-utilization of labeled amino acids that causes underestimation of degradation rate. Characterization of DFP labeling showed that protein labeling was fast, about 50% of the label was released during a 24 h interval, labeling by DFP metabolites was negligible, inhibition of brain acetylcholinesterase was not detectable, and labeling by [(3)H]- and [(14)C]DFP was equivalent. To assay degradative capacity, proteins were first labeled with [(3)H]DFP, followed by labeling with [(14)C]DFP that was given 24 or 72 h later. The (3)H/(14)C ratio in each animal was used as a relative measure of removal of (3)H-labeled proteins. (3)H/(14)C ratios were generally significantly higher in portacaval-shunted rats than in controls, consistent with reduced proteolytic capacity. Assays of amino acid incorporation into brain protein generally replicated literature reports, supporting the conclusion that protein synthesis unlikely to be markedly inhibited and amino acid recycling influences calculated protein synthesis rates in shunted rats. Therapeutic strategies to reduce ammonia level would help normalize lysosomal functions and protein and lipid turnover. PMID:24154686

  13. Differences in Lp(a) concentrations and apo(a) polymorphs between black and white Americans

    Microsoft Academic Search

    Santica M. Marcovina; John J. Albers; Ellen Wijsmant; ZuHui Zhang; Nicola H. Chapman; Hal Kennedy

    Lp(a) concentrations in nmol\\/L and apo(a) size isoforms, expressed in terms of the relative number of apo(a) kringle 4 (K4) repeats, were determined in 3959 whites and blacks from four US. communities. Plasma Lp(a) analyses were performed by an ELISA method insensitive to apo(a) size heterogeneity and apo(a) size isoforms were determined by high resolution agarose gel electrophoresis. Allele frequen-

  14. Sequence and Functional Analysis of EBNA-LP and EBNA2 Proteins from Nonhuman Primate Lymphocryptoviruses

    Microsoft Academic Search

    RONGSHENG PENG; ALEXEY V. GORDADZE; EZEQUIEL M. FUENTES PANANA; FRED WANG; JIANCHAO ZONG; GARY S. HAYWARD; JIE TAN; PAUL D. LING

    2000-01-01

    The Epstein-Barr virus (EBV) EBNA-LP and EBNA2 proteins are the first to be synthesized during establishment of latent infection in B lymphocytes. EBNA2 is a key transcriptional regulator of both viral and cellular gene expression and is essential for EBV-induced immortalization of B lymphocytes. EBNA-LP is also important for EBV-induced immortalization of B lymphocytes, but far less is known about

  15. Analysis of the Suitability of OMPS LP Ozone Profile Dataset for Extending the Aura MLS Record

    NASA Astrophysics Data System (ADS)

    Kramarova, N. A.; Bhartia, P. K.; Stolarski, R. S.; DeLand, M. T.

    2014-12-01

    The new Ozone Mapping and Profiler Suite (OMPS), launched on 28 October 2011 on the Suomi National Polar-orbiting Partnership satellite, represents the next generation of the US ozone monitoring system. The OMPS Limb Profiler (LP) sensor measures solar radiances scattered from the atmospheric limb in the UV and visible spectral ranges and reconstruct the vertical ozone profiles from the cloud top up to 60 km. The regular LP observations started in early 2012, and now the LP data record exceeds 2.5 years. In this presentation we will demonstrate capability of the new LP sensor to characterize the vertical ozone distribution in different atmospheric regions that are most sensitive to the changes in the stratospheric composition and dynamics. We will consider: a) the seasonal ozone patterns in the lower stratosphere - upper troposphere; b) the vertical ozone distribution inside the Antarctic ozone hole; c) the ozone patterns forced by the Quasi-Biennial Oscillations in the lower tropical stratosphere. The main focus of this study is to perform a comprehensive analysis of ozone patterns obtained from OMPS LP with those observed by Aura MLS to isolate similarities and differences between two sensors in characterizing these processes. We will examine how well LP reproduces the named above natural signals in comparison with MLS in terms of amplitude, phase and vertical structure. One of the key issues is that two instruments measure ozone in different coordinate systems: the LP measures ozone profiles as number density on a regular altitude scale, while Aura MLS retrieves ozone profiles as mixing ratios on pressure vertical grids. The comparison of two measurements requires unit conversion that in turn involves temperature profiles. Thus, the uncertainties related to the unit conversion should be accounted during the analysis. This scientific validation is critical for the further LP algorithm improvement and continuation of the Aura MLS ozone record in the future.

  16. High-resolution linkage map in the vicinity of the Lp locus

    SciTech Connect

    Mullick, A.; Gros, P.; Trasler, D. [McGill Univ., Montreal, Quebec (Canada)] [McGill Univ., Montreal, Quebec (Canada)

    1995-04-10

    Looptail (Lp) is a mutation that profoundly affects neurulation in mouse and is characterized by craniorachischisis, an open neural tube extending from the midbrain to the tail in embryos homozygous for the mutation. Lp maps to the distal portion of mouse chromosome 1, and as part of a positional cloning approach, we have generated a high-resolution linkage map of the Lp chromosomal region. For this, we have carried out extensive segregation analysis in a total of 706 backcross mice informative for Lp and derived from two crosses, (Lp/ + X SJL/J)F1 X SJL/J and (Lp/ + X SWR/J)F1 X SWR/J. In addition, 269 mice from a (Mus spretus X C57BL/6J)F1 X C57BL/6J interspecific backcross were also used to order marker loci and calculate intergene distances for this region. With these mice, a total of 28 DNA markers corresponding to either cloned genes or anonymous markers of the SSLP or SSCP-types were mapped within a 5-cM interval overlapping the Lp region, with the following locus order and interlocus distances (in cM): centromere-D1Mit110 / Atp1{beta}1 / Cd3{zeta} /Cd3{eta} / D1Mit145 - D1Hun14 /D1Mit15 - D1Mit111 / D1Mit112 - D1Mit114 - D1Mit148 / D1Mit205/ D1Mit36 / D1Mit146 / D1Mit147 / D1Mit149 / Spnal1/Fcer1{alpha}-Eph1-Hlx1/D1Mit62. These studies have allowed the delineation of a maximum genetic interval for Lp of 0.5 cM, a size amenable to physical mapping techniques. 58 refs., 4 figs., 2 tabs.

  17. Assessment of shunt volumes in children with ventricular septal defects: comparative quantification of MR flow measurements and invasive oximetry.

    PubMed

    Esmaeili, Anoosh; Höhn, Rene; Koch, Arne; Vogl, Thomas Josef; Hofstetter, Roland; Abolmaali, Nasreddin

    2006-10-01

    The aim of this study was to compare the results of magnetic resonance based shunt volume measurements with the results of the invasive method by the principle of Fick. In 14 children (median age: 16.5 months) with ventricular septal defects the shunt volume was quantified by magnetic resonance flow measurements under spontaneous breathing conditions as well as with invasive angiography during one sedation. A good correlation between both methods was observed (r(2) = 0.8, p <0.0001, CI(95%) = 0.62-1.22). A tendency towards higher values in the noninvasive technique was found in the Bland-Altman plot (bias = 3.79). Magnetic resonance based shunt measurements are a reliable alternative to the invasive shunt measurement by cardiac catheterization. PMID:16830267

  18. Successful management with 2 overlapping bare stents for post-carotid endarterectomy carotid pseudoaneurysm secondary to carotid shunt.

    PubMed

    Varetto, Gianfranco; Castagno, Claudio; Quaglino, Simone; Garneri, Paolo; Benintende, Emilio; Gibello, Lorenzo; Rossato, Denis; Rispoli, Pietro

    2015-04-01

    Pseudoaneurysms are a rare complication of carotid endarterectomy. We successfully excluded with 2 overlapping bare stents a distal carotid artery pseudoaneurysm very likely induced by a Pruitt-Inahara shunt 2 months after carotid endarterectomy. PMID:25637577

  19. Unusual presentation of adult metastatic peritoneal medulloblastoma associated with a ventriculoperitoneal shunt: a case study and review of the literature.

    PubMed Central

    Magtibay, Paul M.; Friedman, Jonathan A.; Rao, Ravi D.; Buckner, Jan C.; Cliby, William A.

    2003-01-01

    Patients with medulloblastoma uncommonly develop extracerebral metastases. We describe an adult patient with the unusual occurrence of intraperitoneal metastases associated with a ventriculoperitoneal (VP) shunt, as well as her subsequent treatment with high-dose chemotherapy and bone marrow transplantation. We review the literature regarding this rare presentation and association of metastatic spread via VP shunt devices. A 37-year-old woman presented with a rapidly enlarging pelvic mass. She had a history of medulloblastoma and had been treated with a combination of surgery, chemotherapy, and radiation 5 years previously, at which time a VP shunt had been placed for cerebrospinal fluid leakage. At laparotomy, she had unresectable intraperitoneal metastatic medulloblastoma. After an excellent response to cyclophosphamide, etoposide, and cisplatin, she underwent a resection of residual disease, followed by high-dose chemotherapy and a bone marrow transplant. We conclude that adult onset medulloblastoma with metastasis to the peritoneal cavity is rare and may be associated with a VP shunt. PMID:12816729

  20. Locally resonant band gaps achieved by equal frequency shunting circuits of piezoelectric rings in a periodic circular plate

    NASA Astrophysics Data System (ADS)

    Dai, Longxiang; Jiang, Shan; Lian, Ziyang; Hu, Hongping; Chen, Xuedong

    2015-02-01

    This work presents an investigation on vibration transmission in a circular thin plate consisting of metal rings and piezoelectric rings arrayed periodically. Each piezoelectric ring is linked to an independent resistive-inductive (RL) resonant shunting circuit. For a periodic rectangular piezoelectric plate, equal inductances are commonly used in resonant shunting circuits. However, for the circular one, the locally resonant (LR) band gap (BG) cannot be formed by shunting circuits with equal inductances, because different periodic cell has a different capacitance. Instead of equivalent inductance circuits, the equal frequency shunting circuits are employed to tune the resonance frequency of each circuit into the same, thus an integrating LR BG is obtained. A transfer matrix method is used to calculate transmission factor in the low frequency range. The theoretical model is verified by finite element method (FEM). The impact of geometric and circuit parameters on the properties of the LR BG and vibration attenuation band (VAB) has also been analyzed.

  1. Coupling of low-order LP modes propagating in cylindrical waveguides into whispering gallery modes in microspheres.

    PubMed

    Adamovsky, G; Wrbanek, S

    2013-01-28

    Whispering gallery modes in microspheres are excited by light delivered to them via optical fibers imbedded in a half-block coupler. The corresponding light intensity resonances in microspheres and coupling of two low-order linearly polarized modes in the fibers, LP?? and LP??, into the microspheres are observed. The LP?? and LP?? modes are delivered to the microsphere via a cylindrical optical fiber carrying light at two operating wavelengths, 1550 and 1300 nm correspondingly. The resonances behavioral differences generated by these fiber modes are also observed and explained. The properties of resonances generated by the LP?? and LP?? modes are analyzed using a linear polarizer inserted in the path of light propagating in optical fibers. PMID:23389207

  2. Lactobacillus paracasei Lp6 favors immune modulation induced by allergoid treatment in ragweed sensitized mice.

    PubMed

    Petrarca, C; Lazzarin, F; Lanuti, P; Marchisio, M; Miscia, S; Rossi, C; Braga, M; Mistrello, G; Di Gioacchino, M

    2011-01-01

    It has been hypothesized that lactic acid bacteria (LAB) could be used as adjuvant for specific immunotherapy (SIT), as various studies conducted on humans and animals converge to define LAB as anti-Th2 modulators and Treg inducers. In the present study we evaluated the effects of LAB, in particular Lactobacillus paracasei Lp6 (Lp6), in a mouse model of ragweed (RW) allergy. Groups of Balb/c mice, experimentally sensitized towards ragweed, were treated by viable Lp6 or by RWallergoid with or without co-administration of Lp6. A control group was sham-sensitized with PBS and sham-treated with water and a group was sensitized with RW and treated with water. Serum IgE, RW-induced release of IFN-gamma, IL-4 and IL-10 from splenocytes and the frequency of CD4CD25 regulatory T cells (Tregs) expressing Foxp3 or IL-10 were evaluated in various groups. RW-allergoid treatment induced a reduction of serum IgE, with a decrease in RW-induced release of IL-4, and an increase in IL-10 and IFN-gamma, along with a significant change in the frequency of Tregs, both CD25+ and -. The joint RWallergoid+ Lp6 treatment induced the highest degree of suppression of allergen-driven IL-4, the greatest reduction of IL-4/IFN-gamma and IL-4/IL-10 ratios and the most significant increase of Foxp3 and IL-10 expressing Tregs. The study shows that Lp6 strengthens the immune modulation induced by allergoid-SIT in RW-sensitized mice, essentially characterized by a differential induction of Tregs associated to a reduction of IL-4; data converge to define a role of SIT adjuvant for Lp6. PMID:22230395

  3. A prospective evaluation of changes in neuropsychological and liver function tests following transjugular intrahepatic portosystemic stent-shunt

    Microsoft Academic Search

    Rajiv Jalan; Rebecca Gooday; Ronan E. O'Carroll; Doris N. Redhead; Robert A. Elton; Peter C. Hayes

    1995-01-01

    Background\\/Aims: This study was designed to assess changes in: (a) neuropsychological tests, measures of memory, quality of life and scores for anxiety and depression; (b) liver function tests; and (c) the relationship between these following transjugular intrahepatic portosystemic stent-shunt.Methods: Twenty-nine patients undergoing transjugular intrahepatic portosystemic stent-shunt for recurrent variceal haemorrhage, 12 matched patients with cirrhosis and variceal haemorrhage manage with

  4. CT stereotaxy guided lateral trans-cerebellar programmable fourth ventriculo–peritoneal shunting for symptomatic trapped fourth ventricle

    Microsoft Academic Search

    Rewati Raman Sharma; Sanjay J. Pawar; R. V. Devadas; Ebenezer J. Dev

    2001-01-01

    A trapped fourth ventricle is a rare clinico-radiological entity producing symptoms suggestive of a progressive posterior fossa mass lesion. It is mainly reported in children as a late complication of lateral ventricular shunting to relieve infantile post-meningitic or post-hemorrhagic hydrocephalus. Optional treatment of the trapped fourth ventricle remains controversial. Placement of fourth ventricular shunting via a conventional midline approach can

  5. Reversal of transjugular intrahepatic portosystemic shunt (TIPS)-induced hepatic encephalopathy using a strictured self-expanding covered stent.

    PubMed

    Cox, Mitchell W; Soltes, George D; Lin, Peter H; Bush, Ruth L; Lumsden, Alan B

    2003-01-01

    Hepatic encephalopathy is a known complication following percutaneous transjugular intrahepatic portosystemic shunt (TIPS) placement. We describe herein a simple and effective strategy of TIPS revision by creating an intraluminal stricture within a self-expanding covered stent, which is deployed in the portosystemic shunt to reduce the TIPS blood flow. This technique was successful in reversing a TIPS-induced hepatic encephalopathy in our patient. PMID:15061178

  6. Reversal of Transjugular Intrahepatic Portosystemic Shunt (TIPS)-Induced Hepatic Encephalopathy Using a Strictured Self-Expanding Covered Stent

    SciTech Connect

    Cox, Mitchell W. [Baylor College of Medicine, Houston, Texas, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery (United States); Soltes, George D. [Baylor College of Medicine, Houston, Texas, Division of Interventional Radiology, Department of Radiology (United States); Lin, Peter H., E-mail: plin@bcm.tmc.edu; Bush, Ruth L.; Lumsden, Alan B. [Baylor College of Medicine, Houston, Texas, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery (United States)

    2003-11-15

    Hepatic encephalopathy is a known complication following percutaneous transjugular intrahepatic portosystemic shunt (TIPS) placement. We describe herein a simple and effective strategy of TIPS revision by creating an intraluminal stricture within a self-expanding covered stent, which is deployed in the portosystemic shunt to reduce the TIPS blood flow. This technique was successful in reversing a TIPS-induced hepatic encephalopathy in our patient.

  7. Pathophysiological role and clinical significance of lipoprotein-associated phospholipase A? (Lp-PLA?) bound to LDL and HDL.

    PubMed

    Tellis, Constantinos C; Tselepis, Alexandros D

    2014-01-01

    Lipoprotein-associated phospholipase A2 (Lp-PLA2), also named as platelet-activating factor (PAF)-acetylhydrolase, exhibits a Ca2+-independent phospholipase A2 activity and catalyzes the hydrolysis of the ester bond at the sn-2 position of PAF and oxidized phospholipids (oxPL). These phospholipids are formed under oxidative and inflammatory conditions, and may play important roles in atherogenesis. The vast majority of plasma Lp-PLA2 mass binds to low-density lipoprotein (LDL) while a smaller amount is associated with high-density lipoprotein (HDL). Lp-PLA2 is also bound to lipoprotein (a) [Lp(a)], very low-density lipoprotein (VLDL) and remnant lipoproteins. Several lines of evidence suggest that the role of plasma Lp-PLA2 in atherosclerosis may depend on the type of lipoprotein particle with which this enzyme is associated. Data from large Caucasian population studies have supported plasma Lp-PLA2 (primarily LDL-associated Lp-PLA2) as a cardiovascular risk marker independent of, and additive to, traditional risk factors. On the contrary, the HDL-associated Lp-PLA2 may express antiatherogenic activities and is also independently associated with lower risk for cardiac death. The present review presents data on the biochemical and enzymatic properties of Lp-PLA2 as well as its structural characteristics that determine the association with LDL and HDL. We also critically discuss the possible pathophysiological and clinical significance of the Lp- PLA2 distribution between LDL and HDL in human plasma, in view of the results of prospective epidemiologic studies on the association of Lp-PLA2 with future cardiovascular events as well the recent studies that evaluate the possible effectiveness of specific Lp-PLA2 inhibitors in reducing residual cardiovascular risk. PMID:24953389

  8. Failure of neural tube closure in the loop-tail ( Lp) mutant mouse: analysis of the embryonic mechanism

    Microsoft Academic Search

    Dianne Gerrelli; Andrew J Copp

    1997-01-01

    Loop-tail (Lp) is unique among mouse mutants in failing to initiate neural tube closure at the cervical\\/hindbrain boundary (so-called `Closure 1'), at the 5–7 somite stage. Lp\\/Lp embryos go on to develop a malformation that closely resembles cranio-rachischisis, the most severe neural tube defect found in humans. We investigated several possible embryological mechanisms that may underlie this failure of neural

  9. Noncirrhotic Extrahepatic Portosystemic Shunt Causing Adult-Onset Encephalopathy Treated with Endovascular Closure

    PubMed Central

    Elnekave, Eldad; Belenky, Eugenia; Van der Veer, Lindsley

    2015-01-01

    A 54-year-old woman presented with a six-month history of episodic confusion and progressive ataxia. A comprehensive metabolic panel was notable for elevated values of alkaline phosphatase (161?U/L), total bilirubin (1.5?mg/dL), and serum ammonia of 300?umol/L (normal range 9–47). Hepatitis panel, relevant serological tests, tumor markers (CA-19-9, CEA), and urea cycle enzyme studies were unrevealing. Lactulose and rifaximin therapy failed to normalize serum ammonia levels. Imaging revealed a structural vascular abnormality communicating between an enlarged inferior mesenteric vein and the left renal vein, measuring 16?mm in greatest diameter. The diagnosis of congenital extrahepatic portosystemic shunt was made and endovascular shunt closure was performed using a 22?mm Amplatzer II vascular plug. Within a day, serum ammonia levels normalized. Lactulose and rifaximin were discontinued, and confusion and ataxia resolved. PMID:26199783

  10. Comparison of 2D transmon coherence for different capacitive shunt fabrication methods

    NASA Astrophysics Data System (ADS)

    Yoder, Jonilyn; Kamal, Archana; Yan, Fei; Gudmundsen, Theodore; Welander, Paul; Gustavsson, Simon; Hover, David; Kerman, Andrew; Sears, Adam; Oliver, William

    2015-03-01

    Improvements in superconducting qubit coherence times and reproducibility have been demonstrated using capacitive shunting. In this study, we present a side-by-side comparison of two distinct methods for preparing the aluminum shunt capacitor material for 2D transmon superconducting qubit devices. The first method involved in situ wafer outgassing prior to molecular beam epitaxy aluminum evaporation. The second method involved ex situ wafer annealing prior to electron gun aluminum evaporation. Materials analysis for each process will be detailed. Experimental results, including qubit coherence times and superconducting coplanar waveguide resonator internal quality factors, will be presented for representative devices prepared using both methods. This work is sponsored by the Assistant Secretary of Defense for Research and Engineering under Air Force Contract FA8721-05-0002. Opinions, interpretations, conclusions, and recommendations are those of the authors and are not necessarily endorsed by the United States Government.

  11. Parkinsonian Symptomatology May Correlate with CT Findings before and after Shunting in Idiopathic Normal Pressure Hydrocephalus

    PubMed Central

    Ishii, Mitsuaki; Kawamata, Toshio; Akiguchi, Ichiro; Yagi, Hideo; Watanabe, Yuko; Watanabe, Toshiyuki; Mashimo, Hideaki

    2010-01-01

    We aimed to investigate the characteristics of Parkinsonian features assessed by the unified Parkinson's disease rating scale (UPDRS) and determine their correlations with the computed tomography (CT) findings in patients with idiopathic normal pressure hydrocephalus (iNPH). The total score and the scores for arising from chair, gait, postural stability, and body hypokinesia in the motor examination section of UPDRS were significantly improved after shunt operations. Stepwise multiple regression analysis revealed that postural stability was the determinant of the gait domain score of the iNPH grading scale. The canonical correlation analysis between the CT findings and the shunt-responsive Parkinsonian features indicated that Evans index rather than midbrain diameters had a large influence on the postural stability. Thus, the pathophysiology of postural instability as a cardinal feature of gait disturbance may be associated with impaired frontal projections close to the frontal horns of the lateral ventricles in the iNPH patients. PMID:20948890

  12. Comparison of Multiple Carrier Disposition PWM Techniques Applied for Multi-Level Shunt Active Filter

    NASA Astrophysics Data System (ADS)

    Kathalingam, Sebasthi Rani; Karantharaj, Porkumaran

    2012-07-01

    This work presents the simulation of a shunt active filter using seven-level cascaded inverter. The ultimate objective is to bring out the influence of multiple carrier level shifted PWM techniques on the performance of a shunt active filter. Classical disposition PWM techniques such as PD, POD and APOD have been used to generate the gating signals for the inverter active switches. A comparison is presented to substantiate the effect of these techniques in filtering. The comparison is made from the perspective of reduction in THD of source currents after filtering. For compensation current extraction synchronous detection method has been used. The harmonic reduction is achieved in source currents as well as source voltages.

  13. Integration of Thermal Energy Harvesting in Semi-Active Piezoelectric Shunt-Damping Systems

    NASA Astrophysics Data System (ADS)

    Lubieniecki, Micha?; Uhl, Tadeusz

    2015-01-01

    The opportunities to energize a broad range of devices by use of energy available almost anywhere and in many forms are almost unlimited. A major advantage of energy harvesting is the manufacture of small autonomous electronic devices with no need for power supply and maintenance. Shunt damping circuits, although unfavorably affected by the size and mass of bulky coil inductors, started to base on synthetic inductors losing their passivity. In this paper we report a study of the feasibility of powering shunt damping circuits by use of thermal energy otherwise irrevocably lost from a bearing. The heat generated in the bearing is converted thermoelectrically into electric energy which is then used to power synthetic inductance circuitry. We show that the power demand of such circuit can be satisfied by use of a thermoelectric generator paired with a moderately loaded bearing.

  14. Portacaval shunt with arterialization of the portal vein by means of a low flow arteriovenous fistula.

    PubMed

    Adamons, R J; Butt, K; Iyer, S; DeRose, J; Dennis, C R; Kinkhabwala, M; Gordon, D; Martin, E

    1978-06-01

    A new operative technique was designed combining an end-to-side portacaval shunt with arterialization of the intrahepatic portal vein by means of a saphenous vein graft between the right gastroepiploic artery and the stump of the portal vein. The objective of this operation is to perfuse the hepatic portion of the portal vein with a low volume of arterial blood to ameliorate the adverse metabolic consequences of portosystemic decompression. The procedure was performed upon 18 patients with one operative mortality. The mean follow-up period is 15.4 months. The benefits of this operation are evident in the prevention of hepatic decompensation and avoidance of encephalophy, thus permiting unrestricted protein intake. The operation is well tolerated, and the operative mortality appears to be less than that following conventional shunting procedures. PMID:653559

  15. Laparoscopic umbilical hernia repair in a cirrhotic patient with a peritoneovenous shunt.

    PubMed

    Umemura, Akira; Suto, Takayuki; Sasaki, Akira; Fujita, Tomohiro; Endo, Fumitaka; Wakabayashi, Go

    2015-05-01

    A 62-year-old Japanese woman who had developed massive cirrhotic ascites was referred to our hospital for a peritoneovenous shunt implant. However, CT examination revealed an umbilical hernia that had not been observed before the peritoneovenous shunt was implanted. We decided to perform laparoscopic umbilical hernia repair to keep carbon dioxide from flowing backward into the central circulatory system. We first clamped the catheter and set the upper limit of the pneumoperitoneum pressure to 6?mmHg. The central venous pressure was also measured simultaneously. Mesh was then applied over the hernia and fixed by the double-crown technique. Finally, 1000-mL physiological saline was infused into the abdominal cavity while the pneumoperitoneum was slowly released. In this case, we safely performed laparoscopic umbilical hernia repair while making some alterations, specifically catheter clamping, reducing pneumoperitoneum pressure, monitoring central venous pressure, and infusing physiological saline. PMID:25418015

  16. Options Studied for Managing Space Station Solar Array Electrical Hazards for Sequential Shunt Unit Replacement

    NASA Technical Reports Server (NTRS)

    Delleur, Ann M.; Kerslake, Thomas W.; Levy, Robert K.

    2004-01-01

    The U.S. solar array strings on the International Space Station are connected to a sequential shunt unit (SSU). The job of the SSU is to shunt, or short, the excess current from the solar array, such that just enough current is provided downstream to maintain the 160-V bus voltage while meeting the power load demand and recharging the batteries. Should an SSU fail on-orbit, it would be removed and replaced with the on-orbit spare during an astronaut space walk or extravehicular activity (EVA) (see the photograph). However, removing an SSU during an orbit Sun period with input solar array power connectors fully energized could result in substantial hardware damage and/or safety risk to the EVA astronaut. The open-circuit voltage of cold solar-array strings can exceed 320 V, and warm solar-array strings could feed a short circuit with a total current level exceeding 240 A.

  17. Rotational and magnetic shunt permanent magnet quadrupoles with variable magnetic strength

    SciTech Connect

    Vladimir Kashikhin et al.

    2002-03-28

    Next Linear Collider (NLC) and Very Large Hadron Collider (VLHC) projects suppose to use permanent magnets as bending, focusing and correcting elements. Prototypes of two permanent magnet quadrupoles with variable strength were built and successfully tested in Fermilab. Quadrupoles have 12.7 mm aperture diameter, 100 T/m gradient with an adjustment range of 0 to -20%. Special designs provide high precision magnetic center stability during strength change. SmCo5 permanent magnet bricks were used in these prototypes. Rotational quadrupole consists of four sections. Two central sections are rotated in counter directions to adjust the strength. Magnetic shunt quadrupole design provides variable shunting of the magnetic flux. The numerical simulation, designs, measuring results are described.

  18. Application of VSC-HVDC with Shunt Connected SMES for Compensation of Power Fluctuation

    NASA Astrophysics Data System (ADS)

    Linn, Zarchi; Kakigano, Hiroaki; Miura, Yushi; Ise, Toshifumi

    This paper describes the application of VSC-HVDC (High Voltage DC Transmission using Voltage Source Converter) with shunt connected SMES (Superconducting Magnetic Energy Storage) for compensation of power fluctuation caused by fluctuating power source such as photovoltaics and wind turbines. The objectives of this proposed system is to smooth out fluctuating power in one terminal side of HVDC in order to avoid causing power system instability and frequency deviation by absorbing or providing power according to the system requirement while another terminal side power is fluctuated. The shunt connected SMES charges and discharges the energy to and from the dc side and it compensates required power of fluctuation to obtain constant power flow in one terminal side of VSC-HVDC system. This system configuration has ability for power system stabilization in the case of power fluctuation from natural energy source. PSCAD/EMTDC simulation is used to evaluate the performance of applied system configuration and control method.

  19. Transcranial Doppler ultrasonography in the detection of venous to arterial shunting in acute stroke and transient ischaemic attacks.

    PubMed Central

    Yeung, M; Khan, K A; Shuaib, A

    1996-01-01

    OBJECTIVES: To prospectively evaluate the prevalence of venous to arterial shunting in patients with acute stroke and transient ischaemic attacks (TIAs) using transcranial Doppler ultrasonography (TCD) with saline contrast. METHODS: A consecutive series of patients with stroke or TIA underwent contrast TCD. Patients were subsequently divided into groups according to causative factors for stroke or TIA. The prevalence of right to left shunt was assessed within these groups. RESULTS: A total of 210 patients underwent contrast TCD. A right to left shunt was detected in 28.6% of patients (60 of 210). Among the patients with cryptogenic stroke or TIA, 37.1% (43 of 116) had a positive contrast TCD whereas only 18% (17 of 94) with another identifiable cause had a positive test (P = 0.0024). When age was used to further classify those patients with cryptogenic stroke, TCD was positive in 59.3% patients (16 of 27) of < or = 50 years of age versus 30.3% of patients (27 of 89) > 50 years of age (P = 0.0058). CONCLUSIONS: There was a significantly higher prevalence of venous to arterial shunting in patients with stroke or TIA of undetermined cause than in stroke patients with identifiable aetiologies, as detected by contrast TCD. The prevalence of a venous to arterial shunt was significantly higher in the younger group with cryptogenic stroke. Saline contrast TCD is a relatively non-invasive bedside procedure useful in the detection of venous to arterial shunting. Images PMID:8937335

  20. A case of anastomosis malposition of the Blalock-Taussig shunt diagnosed using perioperative transesophageal echocardiography monitoring.

    PubMed

    Yamamoto, Tomohiro; Schindler, Ehrenfried

    2014-04-01

    The perioperative transesophageal echocardiography (TEE) is a very useful and minimal invasive monitoring not only for the cardiac anesthesia management, but also for the anesthesia management of the non-cardiac operations of the heart high risk patients. In this case report, we report a case of the urgent Blalock-Taussig shunt (BT shunt) operation for a small patient of Fallot's tetralogy with anoxic spell, which showed an atypical change of hemodynamics and SpO2 with the shunt opening. After the BT shunt anastomosis, the diastolic blood pressure decreased with the shunt opening, however, the expected rise of SpO2 was not provided. By the perioperative TEE monitoring with the single plane TEE transducer for neonate; UST-52110S (Hitachi Aloka Medical, Tokyo, Japan) with 4.5 mm in diameter, the cause of this atypical change of hemodynamics and SpO2 was diagnosed to be an accidental anastomosis malposition of the BT shunt to the right pulmonary vein and reported to the operator during the operation, and the operation was performed correctly. PMID:24046098

  1. Dyspnoea and hypoxaemia after lung surgery: the role of interatrial right-to-left shunt

    Microsoft Academic Search

    C. Marini; M. Miniati; N. Ambrosino; B. Formichi; L. Tonelli; G. Di Ricco; C. Michelassi; S. Giusti; I. Spadoni; Respiratory Pathophysiology

    2006-01-01

    After lung surgery, some patients complain of unexplained increased dyspnoea associated with hypoxaemia. This clinical presentation may be due to an interatrial right-to-left shunt despite normal right heart pressure. Some of these patients show postural dependency of hypoxaemia, whereas others do not. In this article, the pathogenesis and mechanisms involved in this post-surgical complication are discussed, and the techniques used

  2. No evidence for mevalonate shunting in moderately affected children with Smith-Lemli-Opitz syndrome

    PubMed Central

    Roullet, Jean-Baptiste; Merkens, Louise S.; Pappu, Anurhada S.; Jacob, Megan D.; Winter, Rolf; Connor, William E.; Steiner, Robert D.

    2012-01-01

    Summary Smith-Lemli-Opitz syndrome (SLOS) is caused by a genetic deficiency in 7-dehydrocholesterol (7-DHC) reductase (EC 1.3.1.21), the last enzyme of the cholesterol synthetic pathway. In SLOS, plasma cholesterol concentration is reduced and immediate precursor concentration (7-DHC) is elevated. Surprisingly, total sterol synthesis is reduced but HMG-CoA reductase activity, a rate-limiting enzyme in cholesterol synthesis is unaltered as judged by normal urinary excretion of mevalonic acid (MVA) (Pappu, 2002). These findings raise the possibility of increased diversion of MVA into the MVA shunt pathway away from sterol synthesis, by activation of the shunt pathway enzymes. To test this hypothesis, we measured the urinary excretion of 3-methylglutaconic acid (U-3MGC), a by-product of the shunt pathway, in 19 mild-to-moderately severely affected SLOS subjects (10 males, 9 females) receiving either a cholesterol-free or a high cholesterol diet, and in 20 age- and sex-matched controls. U-3MGC was similar in SLOS and controls, and was unaffected by dietary cholesterol intake. Further, no change in U-3MGC was observed in a subset of SLOS subjects (n=9) receiving simvastatin. In contrast, U-MVA was reduced by cholesterol supplementation (~54%, p<0.05) and by simvastatin (~50%, p<0.04). There was no correlation between U-3MGC and either plasma sterol concentrations, urinary isoprenoids, or the subjects’ clinical severity score. However U-3MGC was inversely correlated with age (p<0.04) and body weight (p<0.02), and higher in females than in males (~65%, p<0.025). The data show that DHCR7 deficiency does not result in 3MGC accumulation in SLOS and suggest that the MVA shunt pathway is not activated in patients with the condition. PMID:22391996

  3. Usefulness of Transjugular Intrahepatic Portosystemic Shunt in the Management of Bleeding Ectopic Varices in Cirrhotic Patients

    SciTech Connect

    Vidal, V. [CHUM - Saint-Luc Hospital, Department of Radiology (Canada); Joly, L. [CHUM - Saint-Luc Hospital, Clinical Research Center, Liver Unit (Canada); Perreault, P.; Bouchard, L.; Lafortune, M. [CHUM - Saint-Luc Hospital, Department of Radiology (Canada); Pomier-Layrargues, G. [CHUM - Saint-Luc Hospital, Clinical Research Center, Liver Unit (Canada)], E-mail: hepato.saint-luc@sympatico.ca

    2006-04-15

    Purpose. To evaluate the safety and efficacy of transjugular intrahepatic portosystemic shunt (TIPS) in the control of bleeding from ectopic varices. Methods. From 1995 to 2004, 24 cirrhotic patients, bleeding from ectopic varices, mean age 54.5 years (range 15-76 years), were treated by TIPS. The etiology of cirrhosis was alcoholic in 13 patients and nonalcoholic in 11 patients. The location of the varices was duodenal (n = 5), stomal (n = 8), ileocolic (n = 6), anorectal (n = 3), umbilical (n = 1), and peritoneal (n 1). Results. TIPS controlled the bleeding in all patients and induced a decrease in the portacaval gradient from 19.7 {+-} 5.4 to 6.4 {+-} 3.1 mmHg. Postoperative complications included self-limited intra-abdominal bleeding (n = 2), self-limited hemobilia (n = 1), acute thrombosis of the shunt (n = 1), and bile leak treated by a covered stent (n = 1). Median follow-up was 592 days (range 28-2482 days). Rebleeding occurred in 6 patients. In 2 cases rebleeding was observed despite a post-TIPS portacaval gradient lower than 12 mmHg and was controlled by variceal embolization; 1 patient underwent surgical portacaval shunt and never rebled; in 3 patients rebleeding was related to TIPS stenosis and treated with shunt dilatation with addition of a new stent. The cumulative rate of rebleeding was 23% and 31% at 1 and 2 years, respectively. One- and 2-year survival rates were 80% and 76%, respectively. Conclusion. The present series demonstrates that bleeding from ectopic varices, a challenging clinical problem, can be managed safely by TIPS placement with low rebleeding and good survival rates.

  4. Ductal paucity and Warkany syndrome in a patient with congenital extrahepatic portocaval shunt

    PubMed Central

    Sood, Vikrant; Khanna, Rajeev; Alam, Seema; Rawat, Dinesh; Bhatnagar, Shorav; Rastogi, Archana

    2014-01-01

    An eleven-year-old clinically dysmorphic and developmentally retarded male child presenting with complaints of 5 episodes of recurrent cholestatic jaundice since 3 years of age was evaluated. Imaging revealed features consistent with congenital extrahepatic portocaval shunt (Abernethy type 1b), multiple regenerative liver nodules and intrahepatic biliary radical dilatation. The presence of ductal paucity and trisomy 8 were confirmed on liver biopsy and karyotyping. The explanation for unusual and previously unreported features in the present case has been proposed. PMID:24868329

  5. Combined Effects of Shunt and Luminescence Coupling on External Quantum Efficiency Measurements of Multijunction Solar Cells

    Microsoft Academic Search

    Jing-Jing Li; Swee Hoe Lim; Charles R. Allen; Ding Ding; Yong-Hang Zhang

    2011-01-01

    The combined effects of shunt and luminescence coupling on the measurement artifact of external quantum efficiency (EQE) of multi-junction solar cells are studied. The EQE measurement artifact is modeled using DC and small-signal equivalent circuits under voltage and light bias conditions. The modeling results are verified with EQE measurements of a Ge bottom cell of a triple-junction solar cell. It

  6. Embolization of Hepatic Arteriovenous Shunt with Absolute Ethanol in a Patient with Hepatocellular Carcinoma

    SciTech Connect

    Senokuchi, Terutoshi, E-mail: t-seno@m.kufm.kagoshima-u.ac.jp; Baba, Yasutaka, E-mail: yasutaka@m3.kufm.kagoshima-u.ac.jp; Hayashi, Sadao, E-mail: hayashi@m.kufm.kagoshima-u.ac.jp; Nakajo, Masayuki, E-mail: nakajo@m3.kufm.kagoshima-u.ac.jp [Kagoshima University, Department of Radiology, Graduate School of Medical and Dental Sciences (Japan)

    2011-02-15

    We report a 76-year-old man who had hepatocellular carcinoma (HCC) with arteriovenous shunting (AVS). Transcatheter chemoembolization (TACE) was selected as treatment because of poor pulmonary function. To prevent pulmonary embolism caused by the flow of embolic materials through the AVS, we performed embolization of the AVS with absolute ethanol under flow control by balloon catheters. Subsequently, we could perform TACE for HCC safely.

  7. [Effects of venous splenorenal shunt surgery on the morphofunctional state of the liver, kidneys and spleen].

    PubMed

    Siplivy?, V A; Beresnev, A V; Gubina-Vakulik, G I

    1994-01-01

    In the experiment on 18 mongrel dogs it was demonstrated that in exclusion of the blood of the splenic vein from portal circulation early after splenorenal shunting, the impairment in morphofunctional state of the liver, kidneys and spleen is noted. One month after the operation, incomplete reparation in the liver and left kidney, and complete reparation in the right kidney and spleen was noted. PMID:8078245

  8. Common Carotid Artery Duplex for the Bubble Test to Detect Right-to-Left Shunt

    Microsoft Academic Search

    Bruno Censori; Tania Partziguian; Marco Poloni

    2010-01-01

    We prospectively compared the bubble test with agitated saline for right-to-left shunt using transcranial Doppler (TCD) of the right middle cerebral artery and second harmonic imaging duplex of the right common carotid artery (CCA) in 100 consecutive patients. Microembolic signals (MES) were counted offline. MES were classified into 6 classes: absent (class 0), 1–10 MES (class 1), 11–20 MES (class

  9. Is Transcranial Doppler for the Detection of Venous-to-Arterial Circulation Shunts Reproducible?

    Microsoft Academic Search

    S. Sastry; K. Daly; T. Chengodu; C. McCollum

    2007-01-01

    Background: We investigated the reproducibility of contrast transcranial Doppler (TCD), a safe non-invasive test for investigation of venous-to-arterial circulation shunts (v-aCS), usually patent foramen ovale, in young stroke patients. We also investigated whether microbubble contrast was reproducible and whether the addition of blood to agitated saline contrast affected the number of microbubbles produced. Methods: TCD investigation for v-aCS was repeated

  10. Universality of non-Ohmic shunt leakage in thin-film solar cells

    Microsoft Academic Search

    Sourabh Dongaonkar; Jonathan D Servaites; Grayson M Ford; Stephen Loser; James E Moore; Ryan M Gelfand; H. Mohseni; Hugh W Hillhouse; Rakesh Agrawal; Mark A Ratner; T. J. Marks; M. S. Lundstrom; Muhammad A Alam

    2010-01-01

    We compare the dark current-voltage (IV) characteristics of three different thin-film solar cell types: hydrogenated amorphous silicon (a-Si:H) p-i-n cells, organic bulk heterojunction (BHJ) cells, and Cu(In,Ga)Se2 (CIGS) cells. All three device types exhibit a significant shunt leakage current at low forward bias (V<~0.4) and reverse bias, which cannot be explained by the classical solar cell diode model. This parasitic

  11. Surgical treatment of infantile lobar emphysema in cardiovascular disease with left-to-right shunts

    Microsoft Academic Search

    Akinori Isojima; Hiroshi Yuasa; Minoru Kusagawa; Katsuyuki Kubo; Nobuo Yamaguchi

    1978-01-01

    Serious symptoms associated with the lobar emphysema in congenital heart diseases with left-to-right shunt disappeared after\\u000a radical operation for cardiac lesion. The study of seven autopsied cases revealed that the lobar emphysema resulted from check\\u000a valve mechanism created by compression of the bronchi by distended pulmonary artery. Eight cases of our experience of lobar\\u000a emphysema disappeared shortly after the operation

  12. Modifications of cardiac function in cirrhotic patients treated with transjugular intrahepatic portosystemic shunt (TIPS)

    Microsoft Academic Search

    Manuela Merli; Valentina Valeriano; Stefania Funaro; Adolfo Francesco Attili; Andrea Masini; Cesare Efrati; Stefano De Castro; Oliviero Riggio

    2002-01-01

    OBJECTIVE:The implantation of a transjugular intrahepatic portosystemic shunt (TIPS) has been shown to exacerbate the hyperdynamic circulation and might induce a significant cardiac overload. We investigated cardiac function before and 1, 3, 6, and 12 months after the TIPS procedure in cirrhotic patients.METHODS:Eleven patients with nonalcoholic cirrhosis were evaluated. Cardiovascular parameters were assessed by two-dimensional Doppler echocardiography.RESULTS:After TIPS, the left

  13. Transjugular intrahepatic porto-systemic shunt and variceal embolisation in the management of bleeding stomal varices

    Microsoft Academic Search

    Bassam Alkari; Nabeel M. Shaath; Yesar El-Dhuwaib; Ali Aboutwerat; Thomas W. Warnes; Nicholas Chalmers; Basil J. Ammori

    2005-01-01

    Background and aims: Bleeding from stomal varices is un- common. Local measures to control the bleeding offer short-lived control. Our experience with transjugular in- trahepatic porto-systemic shunt (TIPS) and variceal embolisation is presented and appraised. Patient and methods: Three patients presented with bleeding from stomal varices (Child-Pugh class B, n=2 and class C, n=1) in association with primary sclerosing cholangitis,

  14. Right-to-Left Shunt in CADASIL Patients Prevalence and Correlation With Clinical and MRI Findings

    Microsoft Academic Search

    Enza Zicari; Rossana Tassi; Maria L. Stromillo; Michele Pellegrini; Silvia Bianchi; Gabriele Cevenini; Massimo Gistri; Nicola De Stefano; Antonio Federico; Maria T. Dotti

    Background and Purpose—A high prevalence of right-to-left shunt (RLS) was described in a family of patients with CADASIL, a rare cerebral arteriopathy attributable to Notch3 gene mutations. The aim of this study was to determine the prevalence of RLS in patients with CADASIL and possible relation to clinical phenotype and cerebral MRI lesion load. Methods—Twenty-three CADASIL patients underwent Transcranial Doppler

  15. Multiple-mode structural vibration control using negative capacitive shunt damping

    Microsoft Academic Search

    Chul Hue Park; Hyun Chul Park

    2003-01-01

    This paper deals with a novel shunt circuit, which is capable of suppressing multimode vibration amplitudes by using a pair\\u000a of piezoceramic patches. In order to describe the characteristic behaviors of a piezoelectric damper connected with a series\\u000a and a parallel resistor-negative capacitor branch circuit, the stiffness ratio and loss factor with respect to the non-dimensional\\u000a frequency are considered. The

  16. Norwood procedure for hypoplastic left heart syndrome: BT shunt or RV?PA conduit?

    PubMed Central

    Edwards, Linda; Morris, Kevin P; Siddiqui, Ameen; Harrington, Deborah; Barron, David; Brawn, William

    2007-01-01

    Background The Norwood procedure is the first stage palliative procedure for hypoplastic left heart syndrome (HLHS). Traditionally the pulmonary circulation has been supplied via a modified Blalock Taussig (BT) shunt but a recent modification, adopted in some UK centres, substitutes a conduit between right ventricle and pulmonary arteries (RV?PA conduit). It is argued that this will result in a more favourable balance between pulmonary and systemic circulations. Aim To compare the early postoperative haemodynamic profile between patients undergoing a BT shunt or an RV?PA conduit. Methods Retrospective review in a tertiary referral PICU of 51 children with HLHS undergoing the Norwood procedure with either a BT shunt (Group 1; n?=?23) or an RV?PA conduit (Group 2; n?=?28). Data items were extracted at 10 set time points in the initial 96?h, postoperatively. Results Diastolic BP was significantly lower in Group 1 (p<0.001) with a trend towards a higher systolic BP and no difference in mean BP. No between?group differences were found in markers of pulmonary blood flow (PaO2, PaCO2, PaO2/FiO2 ratio), or in markers of systemic blood flow (blood lactate, oxygen extraction ratio), or in estimated ratio of pulmonary:systemic blood flow (Qp:Qs). Despite lower diastolic blood pressure in Group 1 renal and hepatic function did not differ over five post?operative days between groups. Conclusions With the exception of a higher diastolic blood pressure in the RV?PA conduit group, we found no difference in the early haemodynamic profile between patients undergoing an RV?PA conduit or a BT shunt. PMID:17003058

  17. Pulse-envelope-driven dynamics at Floquet anticrossings of He Rydberg atoms: CP vs. LP

    NASA Astrophysics Data System (ADS)

    Zelazny, S. A.; Koch, P. M.

    1997-04-01

    A fast beam of n^3S He Rydberg atoms prepared with CO2 laser-double-resonance excitation flew through a TE_121 mode cavity, exposing the atoms to about 300 oscillations of a 9.904 GHz electric field (peak amplitude F) with a half-sine pulse envelope. Although the field polarization could be set to any ellipticity, the work presented here focuses on the circular (CP) and linear (LP) cases. Detection of a surviving Rydberg atom signal \\cal S(F) occurred downstream in a voltage-labeled 9.8 GHz cavity whose field amplitude was set empirically to ionize (n,M_l=0) atoms more efficiently than (n,|M_l|>= 1) atoms( W. van de Water et al.), Phys. Rev. A 42, 572 (1990). . The ions were detected with a particle multiplier. For both n=28,29 we found that several sharp dips present in \\cal S(F) for LP were transformed for CP into patterns reminiscent of Stueckelberg oscillations (as observed previously with LP at higher frequencies)( S. Yoakum et al.), Phys. Rev. Lett. 69, 1919 (1992). . Calculations of Floquet quasienergy levels detail how avoided crossings in CP fields differ from those in LP fields. \\cal S(F) for CP and LP will be compared with a model based upon computed Floquet quasienergy levels.

  18. Destruction of LP XM46 using the molten salt destruction process. Revision 1

    SciTech Connect

    Upadhye, R.S.; Watkins, B.E.

    1994-04-01

    The preliminary experimental work done on the destruction of the liquid gun propellant LP XM46 (the new designation for LGP-1846) using the Molten Salt Destruction (MSD) Process at the Lawrence Livermore National Laboratory (LLNL) for the US Army is described in this report. A series of 18 continuous experimental runs were made wherein a solution of LP XM46 and water was injected into a bed of molten salt comprising the carbonates of sodium, potassium and lithium, along with air. The purpose of these initial Phase 1 runs was to collect information on the applicability of the Molten Salt Destruction Process for the destruction of LP XM46, identify the key technical uncertainties, and to plan future runs. The tentative results from these experiments, described in detail in the main body of this report, indicate that: (1) LP XM46 can be safely and completely destroyed in a bed of molten salt at temperatures well below those needed for incineration; and (2) under optimum operating conditions, less than 1% of the chemically bound nitrogen in the LP XM46 is converted to NOx, and less than 1% carbon is converted to CO.

  19. Small quasi-static displacements associated with shallow LP seismic sources

    NASA Astrophysics Data System (ADS)

    Thun, J.; Bean, C. J.; Lokmer, I.

    2014-12-01

    Seismic long-period (LP) events are still not completely understood, in part because our source models are poorly constrained. In particular individual LP events are usually inverted using a very limited bandwidth, which might mask important aspects of the source. Following advances from earthquake seismology where sources are inverted using joint static and dynamic data we investigate the possibility of using seismometers as deformation sensors, where 'static' displacements are hypothesised to be in the micrometre range (Bean et al. 2014). We use data from high-density networks on a variety of volcanoes. The first component of this study focuses on the extraction of small static displacement steps from seismometer data. The main challenges we face include low signal-to-noise ratios and ambiguity of the extracted ground motion due to the tilt-sensitivity of the instruments. We use a combination of laboratory experiments on seismometers and numerical simulations to investigate the processing steps needed to perform the 'step' extraction task and to guide the interpretation of the resulting data. The method is applied to signals recorded near the summits of Turrialba volcano (Costa Rica) and Mt Etna (Italy), which exhibit ramp-like displacement waveforms, coincidently associated by 'dynamic' LP recordings. Our interim conclusion is that these LP sources likely have a measurable static component in the source. Our next step is to use this static component to better constrain LP source inversions.

  20. Structural Basis for the Immunogenic Properties of the Meningococcal Vaccine Candidate LP2086.

    PubMed

    Mascioni, Alessandro; Bentley, Breagh E; Camarda, Rosaria; Dilts, Deborah A; Fink, Pamela; Gusarova, Viktoria; Hoiseth, Susan K; Jacob, Jaison; Lin, Shuo L; Malakian, Karl; McNeil, Lisa K; Mininni, Terri; Moy, Franklin; Murphy, Ellen; Novikova, Elena; Sigethy, Scott; Wen, Yingxia; Zlotnick, Gary W; Tsao, Désirée H H

    2009-03-27

    LP2086 is a family of outer membrane lipoproteins from Neisseria meningitidis, which elicits bactericidal antibodies and are currently undergoing human clinical trials in a bivalent formulation where each antigen represents one of the two known LP2086 subfamilies. Here we report the NMR structure of the recombinant LP2086 variant B01, a representative of the LP2086 subfamily B. The structure reveals a novel fold composed of two domains: a "taco-shaped" N-terminal beta-sheet and a C-terminal beta-barrel connected by a linker. The structure in micellar solution is consistent with a model of LP2086 anchored to the outer membrane bilayer through its lipidated N terminus. A long flexible chain connects the folded part of the protein to the lipid anchor and acts as spacer, making both domains accessible to the host immune system. Antibodies broadly reactive against members from both subfamilies have been mapped to the N terminus. A surface of subfamily-defining residues was identified on one face of the protein, offering an explanation for the induction of subfamily-specific bactericidal antibodies. PMID:19103601

  1. Active inductor shunt peaking in high-speed VCSEL driver design

    E-print Network

    Futian Liang; Datao Gong; Suen Hou; Chonghan Liu; Tiankuan Liu; Da-Shung Su; Ping-Kun Teng; Annie Xiang; Jingbo Ye; Ge Jin

    2013-06-04

    An all transistor active inductor shunt peaking structure has been used in a prototype of 8-Gbps high-speed VCSEL driver which is designed for the optical link in ATLAS liquid Argon calorimeter upgrade. The VCSEL driver is fabricated in a commercial 0.25-um Silicon-on-Sapphire (SoS) CMOS process for radiation tolerant purpose. The all transistor active inductor shunt peaking is used to overcome the bandwidth limitation from the CMOS process. The peaking structure has the same peaking effect as the passive one, but takes a small area, does not need linear resistors and can overcome the process variation by adjust the peaking strength via an external control. The design has been tapped out, and the prototype has been proofed by the preliminary electrical test results and bit error ratio test results. The driver achieves 8-Gbps data rate as simulated with the peaking. We present the all transistor active inductor shunt peaking structure, simulation and test results in this paper.

  2. Controversies in the definition and management of insignificant left-to-right shunts.

    PubMed

    Cantinotti, Massimiliano; Assanta, Nadia; Murzi, Bruno; Lopez, Leo

    2014-02-01

    Haemodynamically insignificant left-to-right shunts are frequently discovered when screening for congenital heart disease, resulting in significant economic and psychosocial impact. A literature search was performed within the National Library of Medicine using the keywords small/insignificant/silent atrial septal defect (ASD), ventricular septal defect (VSD), patent ductus arteriosus (PDA) and patent foramen ovale (PFO). The search was refined by adding the keywords definition, classification and follow-up. Our analysis revealed significant heterogeneity in the evaluation and management of innocent left-to-right shunts. The definitions for small defects vary greatly, making it difficult to distinguish between physiologic and pathologic lesions (eg, a PFO vs a true ASD). Most small defects will partially or completely resolve spontaneously early in life. If spontaneous resolution does not occur, the risk for long-term complications (such as embolic events and endocarditis) is low but poses several practical and ethical issues: immediate discharge versus long-term follow-up, duration and frequency of follow-up, and content and method of discussions with the parents. Additionally, there is controversy pertaining to treatment for PDAs and VSDs, particularly among interventional cardiologists, even though risk/benefit analyses are lacking. Standards and guidelines using consensus opinion for the management of insignificant left-to-right shunts are needed to address the heterogeneity in diagnosis and management as well as use of resources, ethical and psychosocial issues. PMID:23886608

  3. Evaluation of peritoneovenous shunt patency with Tc-99m labeled microspheres

    SciTech Connect

    Madeddu, G.; D'Ovidio, N.G.; Casu, A.R.; Mura, R.; Costanza, C.; Lai, N.; LeVeen, H.H.

    1983-04-01

    The LeVeen peritoneovenous shunt (PVS) was investigated in 40 cirrhotic patients with refractory ascites. Five millicuries of Tc-99m-tagged human albumin microspheres (15-36 microns) were injected into the peritoneal cavity between the umbilicus and the left anterior superior iliac spine. The radiotracer was always detectable by scintigram in the lungs when the shunt was patent. In case of malfunction, by contrast, the radioactivity was either restricted to the venous tube or confined below the diaphragm for at least 4 hr. In the presence of complete obstruction, whereas the tube was not visualized after peritoneal injection, it was outlined by direct injection of 2 mCi of Tc-99m albumin microspheres into its subcutaneous tract, where it crossed the 12th rib, immediately above the valve. This technique sufficed to establish whether the site of obstruction was at the valve or in the tubing itself. In one patient, poor visualization of the tube and a delayed image of the lungs was caused by partial occlusion of the valve with fibrinoid debris. This radiotracer method proved simple, quick, and led to an immediate selective replacement when the shunt was not patent. Therefore, the use of this test is recommended for a definitive diagnosis, since there were neither false negatives nor false positives. No complications such as embolism or bacterial infection were encountered with Tc-99m human albumin microspheres, which are excellent tracers.

  4. Simultaneous Cranioplasty and Subdural-Peritoneal Shunting for Contralateral Symptomatic Subdural Hygroma following Decompressive Craniectomy

    PubMed Central

    Lin, Muh-Shi; Chen, Tzu-Hsuan; Kung, Woon-Man; Chen, Shuo-Tsung

    2015-01-01

    Background. Contralateral subdural hygroma caused by decompressive craniectomy tends to combine with external cerebral herniation, causing neurological deficits. Material and Methods. Nine patients who underwent one-stage, simultaneous cranioplasty and contralateral subdural-peritoneal shunting were included in this study. Clinical outcome was assessed by Glasgow Outcome Scale as well as Glasgow Coma Scale, muscle power scoring system, and complications. Results. Postoperative computed tomography scans demonstrated completely resolved subdural hygroma and reversed midline shifts, indicating excellent outcome. Among these 9 patients, 4 patients (44%) had improved GOS following the proposed surgery. Four out of 4 patients with lethargy became alert and orientated following surgical intervention. Muscle strength improved significantly 5 months after surgery in 7 out of 7 patients with weakness. Two out of 9 patients presented with drowsiness due to hydrocephalus at an average time of 65 days after surgery. Double gradient shunting is useful to eliminate the respective hydrocephalus and contralateral subdural hygroma. Conclusion. The described surgical technique is effective in treating symptomatic contralateral subdural hygroma following decompressive craniectomy and is associated with an excellent structural and functional outcome. However, subdural-peritoneal shunting plus cranioplasty thoroughly resolves the subdural hygroma collection, which might deteriorate the cerebrospinal fluid circulation, leading to hydrocephalus. PMID:25879062

  5. Vaginal extrusion of a ventriculo-peritoneal shunt catheter in an adult

    PubMed Central

    Bonfield, Christopher M.; Weiner, Gregory M.; Bradley, Megan S.; Engh, Johnathan A.

    2015-01-01

    Ventriculo-peritoneal shunts (VPS) are commonly used in the treatment of various neurosurgical conditions, including hydrocephalus and pseudotumor cerebri. We report only the second case of vaginal extrusion of a VPS catheter in an adult, and the first case with a modern VPS silastic peritoneal catheter. A 45-year-old female with a history of VPS for pseudotumor cerebri, Behcet's syndrome, and hysterectomy presented to our institution with the chief complaint of tubing protruding from her vagina after urination. On gynecologic examination, the patient was found to have approximately 15 cm of VPS catheter protruding from her vaginal apex. A computed tomography scan of the abdomen and shunt X-ray series demonstrated no breaks in the tubing, but also confirmed the finding of the VPS catheter extruding through the vaginal cuff into the vagina. The patient had the VPS removed and an external ventricular drain was placed for temporary cerebrospinal fluid diversion. Ventricular catheter cultures were positive for diphtheroids. After an appropriate course of antibiotics, a contralateral ventriculo-pleural shunt was placed one week later. Although vary rare, vaginal extrusion can occur in adults, even with modern VPS catheters. PMID:25552862

  6. On $L^p$ resolvent estimates for Laplace-Beltrami operators on compact manifolds

    E-print Network

    Ferreira, David Dos Santos; Salo, Mikko

    2011-01-01

    In this article we prove $L^p$ estimates for resolvents of Laplace-Beltrami operators on compact Riemannian manifolds, generalizing results of Kenig, Ruiz and Sogge in the Euclidean case and Shen for the torus. We follow Sogge and construct Hadamard's parametrix, then use classical boundedness results on integral operators with oscillatory kernels related to the Carleson and Sj\\"olin condition. Our initial motivation was to obtain $L^p$ Carleman estimates with limiting Carleman weights generalizing those of Jerison and Kenig; we illustrate the pertinence of $L^p$ resolvent estimates by showing the relation with Carleman estimates. Such estimates are useful in the construction of complex geometrical optics solutions to the Schr\\"odinger equation with unbounded potentials, an essential device for solving anisotropic inverse problems.

  7. Lp stability for entropy solutions of scalar conservation laws with strict convex flux

    NASA Astrophysics Data System (ADS)

    Adimurthi; Ghoshal, Shyam Sundar; Veerappa Gowda, G. D.

    Here we consider the scalar convex conservation laws in one space dimension with strictly convex flux which is in C1. Existence, uniqueness and L1 contractivity were proved by Kružkov [14]. Using the relative entropy method, Leger showed that for a uniformly convex flux and for the shock wave solutions, the L2 norm of a perturbed solution relative to the shock wave is bounded by the L2 norm of the initial perturbation. Here we generalize the result to Lp norm for all 1?pLp norm of the perturbed solution relative to the modified N-wave is bounded by the Lp norm of the initial perturbation for all 1?p

  8. Extrahepatic portacaval shunt via a magnetic compression technique: A cadaveric feasibility study

    PubMed Central

    Yan, Xiao-Peng; Liu, Wen-Yan; Ma, Jia; Li, Jian-Peng; Lv, Yi

    2015-01-01

    AIM: To explore the anatomical feasibility of portacaval shunt using a magnetic compression technique (MCT) in cadavers. METHODS: Computed tomography (CT) images of 30 portal hypertensive patients were obtained. The diameters of the portal vein (PV), the inferior vena cava (IVC), and distance between the two structures were measured. Similar measurements were performed on 20 adult corpses. The feasibility of portacaval shunt based on those measurements was analyzed. First stage of the extrahepatic portacaval shunt using MCT was performed on five cadavers. Specifically, the PV and IVC were exposed through an abdominal incision of the cadavers. The parent magnet was introduced from the femoral vein and was delivered into the IVC by an anchor wire and a 5F Cook catheter. The daughter magnet was introduced into the PV through the splenic vein using an interventional guide wire. When the daughter magnet met the parent magnet, they automatically clipped together and the first stage of the portacaval shunt was set up. RESULTS: The average diameters of the PV and the IVC measured from the 30 CT image were 14.39 ± 2.36 mm and 18.59 ± 4.97 mm, respectively, and the maximum and minimum distances between the PV and the IVC were 9.79 ± 4.56 mm and 9.50 ± 4.79 mm, respectively. From 20 cadavers, the average diameters of the PV and the IVC were 14.48 ± 1.47 mm and 24.71 ± 2.64 mm, and the maximum and minimum distances between the PV and the IVC were 10.14 ± 1.70 mm and 8.93 ± 1.17 mm, respectively. The distances between the PV and the IVC from both the CT images and the cadavers were within the effective length of portacaval anastomosis using MCT (30.30 ± 4.19 mm). The PV and IVC are in close proximity to each other with no intervening tissues or structures in between. Simulated surgeries of the first stage using MCT on five cadavers was successfully performed. CONCLUSION: Anatomically, extrahepatic portacaval shunt employing MCT is highly feasible in humans. PMID:26185378

  9. Use of balloon-occluded retrograde transvenous obliteration with ethanolamine oleate for the treatment of hepatic encephalopathy in a cirrhotic patient with a large spontaneous splenorenal shunt

    Microsoft Academic Search

    Kazushi Numata; Katsuaki Tanaka; Takayoshi Kiba; Satoru Saito; Kazuhito Shirato; Takehiko Kitamura; Hisahiko Sekihara

    1998-01-01

    :   We describe a technique for the treatment of hepatic encephalopathy in a cirrhotic patient with a large spontaneous splenorenal\\u000a shunt. This large shunt was successfully occluded without severe complications by retrograde transrenal venous obliteration\\u000a with ethanolamine oleate after balloon occlusion. This procedure may be an effective method to occlude a large spontaneous\\u000a splenorenal shunt for the treatment of hepatic

  10. Beneficial effect on serum apo AI, apo B and Lp AI levels of Ramadan fasting.

    PubMed

    Adlouni, A; Ghalim, N; Saïle, R; Hda, N; Parra, H J; Benslimane, A

    1998-03-23

    In order to investigate for the first time in Morocco the effect of fasting in Ramadan, the ninth lunar month of the muslim year, on lipoprotein metabolism, we determined the levels of serum apolipoproteins; apolipoprotein AI (apo AI), apo B, apo AIV and those of lipoprotein particles; apo AI-containing lipoprotein particles (Lp AI) and also apo AI and apo AII containing lipoprotein particles (Lp AI:AII) in a group of 32 healthy, volunteer adult males. Determination of all these parameters was carried out on each week of the month of Ramadan and the results are compared with the pre-fasting and the post-fasting values. Ramadan fasting reduces significantly serum apo B (P < 0.05), while serum apo AI is significantly increased (P < 0.05) compared with the pre-fasting period. The increase of apo AI occurred on day 29 of Ramadan by 11.8%. Serum apo AIV was unchanged during the fasting period indicating that food intake during Ramadan is not based on lipid diet. The observed diet pattern during Ramadan showed an increase of total energy intake based on carbohydrates (+1.4% of total energy), proteins (+0.4% of total energy) but not on fat (-0.7% of total energy), compared with a usual diet used in the rest of the year. The fat diet is high in monounsaturated (P < 0.05) and polyunsaturated fatty acid in contrast to saturated fatty acid which decreased (P < 0.05) during Ramadan. On the other hand, analysis of serum Lp AI and Lp AI:AII showed that the levels of Lp AI:AII were unchanged but those of Lp AI were significantly increased (P < 0.01) at the end of Ramadan. These findings show that feeding behaviour that occurs during Ramadan beneficially affects serum apolipoprotein metabolism and may contribute to prevention of cardiovascular diseases. PMID:9565333

  11. Effects of topography and crustal heterogeneities on the source estimation of LP event at Kilauea volcano

    USGS Publications Warehouse

    Cesca, S.; Battaglia, J.; Dahm, T.; Tessmer, E.; Heimann, S.; Okubo, P.

    2008-01-01

    The main goal of this study is to improve the modelling of the source mechanism associated with the generation of long period (LP) signals in volcanic areas. Our intent is to evaluate the effects that detailed structural features of the volcanic models play in the generation of LP signal and the consequent retrieval of LP source characteristics. In particular, effects associated with the presence of topography and crustal heterogeneities are here studied in detail. We focus our study on a LP event observed at Kilauea volcano, Hawaii, in 2001 May. A detailed analysis of this event and its source modelling is accompanied by a set of synthetic tests, which aim to evaluate the effects of topography and the presence of low velocity shallow layers in the source region. The forward problem of Green's function generation is solved numerically following a pseudo-spectral approach, assuming different 3-D models. The inversion is done in the frequency domain and the resulting source mechanism is represented by the sum of two time-dependent terms: a full moment tensor and a single force. Synthetic tests show how characteristic velocity structures, associated with shallow sources, may be partially responsible for the generation of the observed long-lasting ringing waveforms. When applying the inversion technique to Kilauea LP data set, inversions carried out for different crustal models led to very similar source geometries, indicating a subhorizontal cracks. On the other hand, the source time function and its duration are significantly different for different models. These results support the indication of a strong influence of crustal layering on the generation of the LP signal, while the assumption of homogeneous velocity model may bring to misleading results. ?? 2008 The Authors Journal compilation ?? 2008 RAS.

  12. Cloning and characterization of a novel LpWRKY1 transcription factor in tomato.

    PubMed

    Hofmann, Markus Georg; Sinha, Alok Krishna; Proels, Reinhard Korbinian; Roitsch, Thomas

    2008-01-01

    The initiation of defence responses in plants is accompanied by fundamental changes in gene expression: the expression of pathogenesis-related genes is co-ordinately regulated with metabolic changes such as down regulation of photosynthesis and induction of sink metabolism. To identify candidate regulators of this co-ordinated regulatory mechanism, the role of WRKY transcription factors in the initiation of defence response was analysed in tomato. A WRKY-type transcription factor (LpWRKY1) from tomato was cloned by a reverse Northern approach. The corresponding mRNA is rapidly and transiently induced after challenging the cells with an elicitor-preparation derived from the wilt inducing fungus Fusarium oxysporum lycopersici (E-FOL) and the fungal elicitor chitosan, whereas the endogenous signals systemin and salicylic acid are inactive. Inhibition of protein biosynthesis by cycloheximide results in sustained induction of mRNA for LpWRKY1. In contrast, the transient induction of the gene encoding LpWRKY1 in response to elicitation by E-FOL is inhibited by the protein-kinase inhibitor staurosporine and may be mimicked by the phosphatase inhibitors endothall and cantharidine indicating the involvement of protein phosphorylation in the regulation of WRKY-type transcription factors. Direct proof of this postranslational modification of LpWRKY1 was obtained by demonstrating in-gel kinase assays using recombinant LpWRKY1 as substrate. A 44kDa and a 67 kDa protein kinase were shown to be transiently activated to phosphorylate LpWRKY1 protein in response to elicitation with E-FOL. PMID:18406156

  13. Sparse-Representation-Based Direct Minimum Lp-Norm Algorithm for MRI Phase Unwrapping

    PubMed Central

    He, Wei; Liu, Feng

    2014-01-01

    A sparse-representation-based direct minimum Lp-norm algorithm is proposed for a two-dimensional MRI phase unwrapping. First, the algorithm converts the weighted-Lp-norm-minimization-based phase unwrapping problem into a linear system problem whose system (coefficient) matrix is a large, symmetric one. Then, the coefficient-matrix is represented in the sparse structure. Finally, standard direct solvers are employed to solve this linear system. Several wrapped phase datasets, including simulated and MR data, were used to evaluate this algorithm's performance. The results demonstrated that the proposed algorithm for unwrapping MRI phase data is reliable and robust. PMID:24790637

  14. Long Period (LP) volcanic earthquake source location at Merapi volcano by using dense array technics

    NASA Astrophysics Data System (ADS)

    Metaxian, Jean Philippe; Budi Santoso, Agus; Laurin, Antoine; Subandriyo, Subandriyo; Widyoyudo, Wiku; Arshab, Ghofar

    2015-04-01

    Since 2010, Merapi shows unusual activity compared to last decades. Powerful phreatic explosions are observed; some of them are preceded by LP signals. In the literature, LP seismicity is thought to be originated within the fluid, and therefore to be representative of the pressurization state of the volcano plumbing system. Another model suggests that LP events are caused by slow, quasi-brittle, low stress-drop failure driven by transient upper-edifice deformations. Knowledge of the spatial distribution of LP events is fundamental for better understanding the physical processes occurring in the conduit, as well as for the monitoring and the improvement of eruption forecasting. LP events recorded at Merapi have a spectral content dominated by frequencies between 0.8 and 3 Hz. To locate the source of these events, we installed a seismic antenna composed of 4 broadband CMG-6TD Güralp stations. This network has an aperture of 300 m. It is located on the site of Pasarbubar, between 500 and 800 m from the crater rim. Two multi-parameter stations (seismic, tiltmeter, S-P) located in the same area, equipped with broadband CMG-40T Güralp sensors may also be used to complete the data of the antenna. The source of LP events is located by using different approaches. In the first one, we used a method based on the measurement of the time delays between the early beginnings of LP events for each array receiver. The observed differences of time delays obtained for each pair of receivers are compared to theoretical values calculated from the travel times computed between grid nodes, which are positioned in the structure, and each receiver. In a second approach, we estimate the slowness vector by using MUSIC algorithm applied to 3-components data. From the slowness vector, we deduce the back-azimuth and the incident angle, which give an estimation of LP source depth in the conduit. This work is part of the Domerapi project funded by French Agence Nationale de la Recherche (https://sites.google.com/site/domerapi2).

  15. 77 FR 45596 - Shell Energy North America (US), L.P. v. California Independent System Operator Corporation...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-01

    ...Energy Regulatory Commission [Docket No. EL12-88 -000] Shell Energy North America (US), L.P. v. California Independent...Commission) Rules of Practice and Procedure, 18 CFR 385.206, Shell Energy North America (US), L.P. (Complainant)...

  16. 75 FR 56093 - Eagle Rock Desoto Pipeline, LP; Notice of Motion for Extension of Rate Case Filing Deadline

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-15

    ...Commission [Docket No. PR09-1-002] Eagle Rock Desoto Pipeline, LP; Notice of Motion for Extension...Take notice that on September 8, 2010, Eagle Rock Desoto Pipeline, L.P. (Eagle Rock) filed a request to extend the date for...

  17. 78 FR 10128 - Expansion/Reorganization of Foreign-Trade Subzone 70T; Marathon Petroleum Company LP; Detroit, MI

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-02-13

    ...Expansion/Reorganization of Foreign-Trade Subzone 70T; Marathon Petroleum Company LP; Detroit, MI Pursuant to its authority...Site 1 of Subzone 70T and remove Site 3 of the subzone at the Marathon Petroleum Company LP refinery in Detroit, Michigan....

  18. Cell cycle stage-specific phosphorylation of the Epstein-Barr virus immortalization protein EBNA-LP.

    PubMed Central

    Kitay, M K; Rowe, D T

    1996-01-01

    EBNA-LP is a viral nuclear oncoprotein implicated in the immortalization of B lymphocytes by Epstein-Barr virus. An analysis of EBNA-LP migration on polyacrylamide gels was performed with protein derived from the X50-7 lymphoblastoid cell line blocked by hydroxyurea or aphidicolin at the G1/S phase of the cell cycle or by nocodazole at the G2/M phase. More slowly migrating species of EBNA-LP were detected in G2/M phase-arrested cell extracts. Release from nocodazole G2/M block or treatment with phosphatase caused the more slowly migrating species of EBNA-LP to disappear. Analyses of 32PO(4)(3-)-labeled EBNA-LP protein immunoprecipitated from the drug-synchronized cells showed that phosphorylated EBNA-LP was present throughout the cell cycle but that phosphorylation increased in G2 and was maximal at G2/M. Phosphoamino acid analysis revealed that all phosphorylation was on serine residues only. The ability of EBNA-LP to be phosphorylated by p34(cdc2) kinase and casein kinase II exclusively on serines implicates these enzymes as being potentially involved in EBNA-LP phosphorylation. PMID:8892911

  19. 77 FR 76586 - Founders Equity SBIC I, L.P.; Notice Seeking Exemption Under Section 312 of the Small Business...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-12-28

    ...Section 107.730, Financings which Constitute Conflicts...107.730). Founders Equity SBIC I, L.P. proposes...provide debt security financing to Richardson Foods...capital requirements. The financing is brought within the...partners of Founders Equity SBIC I, L.P.,...

  20. 77 FR 58118 - Freeport LNG Development, L.P., FLNG Liquefaction, LLC, FLNG Liquefaction 2, LLC, FLNG...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-09-19

    ...CP12-509-000; PF11-2-000] Freeport LNG Development, L.P., FLNG Liquefaction...notice that on August 31, 2012, Freeport LNG Development, L.P., FLNG Liquefaction...constructed adjacent to the existing Freeport LNG Development, L.P.'s liquefied...

  1. 78 FR 66909 - Sabine Pass Liquefaction, LLC; Sabine Pass LNG, L.P.; Notice of Application to Amend...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-07

    ...Sabine Pass Liquefaction, LLC; Sabine Pass LNG, L.P.; Notice of Application to Amend...Pass Liquefaction, LLC and Sabine Pass LNG, L.P. (collectively, Sabine Pass...2013, in order to increase the total LNG production capacity of the...

  2. 77 FR 65546 - Sabine Pass Liquefaction, LLC; Sabine Pass LNG, L.P.; Notice of Petition To Amend Authorizations...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-10-29

    ...Sabine Pass Liquefaction, LLC; Sabine Pass LNG, L.P.; Notice of Petition To Amend...Pass Liquefaction, LLC and Sabine Pass LNG, L.P. (collectively, Sabine Pass...Modification Project) at the existing Sabine Pass LNG Terminal, located in Cameron Parish,...

  3. 76 FR 9573 - Sabine Pass Liquefaction, LLC and Sabine Pass LNG, L.P.; Notice of Application

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-02-18

    ...Pass Liquefaction, LLC and Sabine Pass LNG, L.P.; Notice of Application Take notice...Pass Liquefaction, LLC and Sabine Pass LNG, L.P. (collectively, Sabine Pass...Liquefaction Project) at the existing Sabine Pass LNG Terminal, located in Cameron Parish,...

  4. 78 FR 62344 - Sabine Pass Liquefaction Expansion, LLC, Sabine Pass Liquefaction, LLC, and Sabine Pass LNG, L.P...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-10-18

    ...Pass Liquefaction, LLC, and Sabine Pass LNG, L.P., Cheniere Creole Trail Pipeline...Pass Liquefaction, LLC, and Sabine Pass LNG, L.P. (collectively referred to as...operate additional liquefied natural gas (LNG) export facilities at the Sabine Pass...

  5. Spectral Element simulation of seismic waves propagation for Long Period (LP) events on Etna volcano (2008). Influence of topography

    E-print Network

    Paris-Sud XI, Université de

    2008-01-01

    and geological setting b) LP events case study De Barros (2011) III. Model setting a) EFISPEC3D (Spectral elementSpectral Element simulation of seismic waves propagation for Long Period (LP) events on Etna ­ Results Geological evolution Four main volcanic phases which generated the volcanic edifice (Branca et al

  6. Management of Transjugular Intrahepatic Portosystemic Shunt (TIPS)-associated Refractory Hepatic Encephalopathy by Shunt Reduction Using the Parallel Technique: Outcomes of a Retrospective Case Series

    SciTech Connect

    Cookson, Daniel T., E-mail: danielthomascookson@yahoo.co.uk; Zaman, Zubayr; Gordon-Smith, James; Ireland, Hamish M. [Royal Infirmary, Departments of Radiology (United Kingdom); Hayes, Peter C., E-mail: p.hayes@ed.ac.uk [Royal Infirmary, Departments of Hepatology (United Kingdom)

    2011-02-15

    Purpose: To investigate the reproducibility and technical and clinical success of the parallel technique of transjugular intrahepatic portosystemic shunt (TIPS) reduction in the management of refractory hepatic encephalopathy (HE). Materials and Methods: A 10-mm-diameter self-expanding stent graft and a 5-6-mm-diameter balloon-expandable stent were placed in parallel inside the existing TIPS in 8 patients via a dual unilateral transjugular approach. Changes in portosystemic pressure gradient and HE grade were used as primary end points. Results: TIPS reduction was technically successful in all patients. Mean {+-} standard deviation portosystemic pressure gradient before and after shunt reduction was 4.9 {+-} 3.6 mmHg (range, 0-12 mmHg) and 10.5 {+-} 3.9 mmHg (range, 6-18 mmHg). Duration of follow-up was 137 {+-} 117.8 days (range, 18-326 days). Clinical improvement of HE occurred in 5 patients (62.5%) with resolution of HE in 4 patients (50%). Single episodes of recurrent gastrointestinal hemorrhage occurred in 3 patients (37.5%). These were self-limiting in 2 cases and successfully managed in 1 case by correction of coagulopathy and blood transfusion. Two of these patients (25%) died, one each of renal failure and hepatorenal failure. Conclusion: The parallel technique of TIPS reduction is reproducible and has a high technical success rate. A dual unilateral transjugular approach is advantageous when performing this procedure. The parallel technique allows repeat bidirectional TIPS adjustment and may be of significant clinical benefit in the management of refractory HE.

  7. Association of Lp-PLA2 Mass and Aysmptomatic Intracranial and Extracranial Arterial Stenosis in Hypertension Patients

    PubMed Central

    Wang, Yan; Zhang, Jin; Qian, Yuesheng; Tang, Xiaofeng; Ling, Huawei; Chen, Kemin; Gao, Pingjin; Zhu, Dingliang

    2015-01-01

    Background and Purpose Intracranial arterial stenosis (ICAS) is a common cause of ischemic stroke in Asians, whereas whites tend to have more extracranial lesions. Lipoprotein-associated phospholipase A2 (Lp-PLA2) has been associated with ischemic stroke by a large amount of work. However, there are few studies focusing on the relationship of Lp-PLA2 and asymptomatic ICAS or extracranial arterial stenosis (ECAS). Wehereby sought to explore the relationship of Lp-PLA2 and ICAS, ECAS and concurrent stenosis in stroke-free hypertensive patients in Chinese population. Methods All the subjects were evaluated for the presence and severity of ICAS and ECAS through computerized tomographic angiography (CTA) covered the whole brain down to the level of aortic arch. Lp-PLA2 mass was measured by enzyme linked immunoassay. The association of Lp-PLA2 and vascular stenosis was analyzed through multivariate logistic regression. Results Among 414 participants, 163 (39.4%) had no ICAS or ECAS, 63 (15.2%) had ECAS only, 111 (26.8%) had ICAS only and 77 (18.6%) had concurrent extraintracranial stenosis. Lp-PLA2 mass was significantly associated with isolated ICAS (OR: 2.3; 95% CI: 1.14-4.64), and concurrent stenosis (OR: 3.93; 95% CI: 1.62-9.51), but was not related to isolated ECAS (OR: 1.54; 95% CI: 0.68-3.48). Lp-PLA2 mass was also associated with moderate to severe ICAS no matter how was the ECAS. Moreover, patients with higher Lp-PLA2 mass showed more sever ICAS and had more intracranial arterial lesions. Conclusion This study revealed the association of Lp-PLA2 mass with ICAS in stroke-free hypertensive patients in Chinese population. The further long-term cohort study was warranted to elucidate the concrete effect of Lp-PLA2 on the asymptomatic ICAS. PMID:26098634

  8. Chemotherapy-induced cerebrospinal fluid malabsorption in a shunted child: case report and review of the literature

    PubMed Central

    O'Halloran, Philip J; Kaliaperumal, Chandrasekaran; Caird, John

    2013-01-01

    Ventriculoperitoneal (VP) shunt insertion is one of the most common neurosurgical procedures for the treatment of chronic hydrocephalus. Although regarded as a relatively benign procedure, several complications including obstruction, infection and mechanical failure can be seen during the postoperative stage. Symptomatic sterile cerebrospinal fluid (CSF) ascites and hydrothoracies are rare complications of VP shunt surgery. The paucity of cases makes identifying the aetiological factors difficult, particularly without catheter tip migration. It is most likely that several factors interact to reduce the absorption of CSF. The authors discuss the case of a 5-year-old girl who developed CSF ascites and a pleural effusion after starting chemotherapy for a suprasellar pilocytic astrocytoma, 2?years post-VP shunt insertion, due to a secondary obstructive hydrocephalus. After the initial management of the presenting symptoms, the child's VP shunt was subsequently changed to a ventriculo-atrial shunt and the patient made an unremarkable recovery. We also review the literature pertaining to this rare complication, assessing identifiable risk factors and surgical management options. PMID:23396932

  9. CT stereotaxy guided lateral trans-cerebellar programmable fourth ventriculo-peritoneal shunting for symptomatic trapped fourth ventricle.

    PubMed

    Sharma, R R; Pawar, S J; Devadas, R V; Dev, E J

    2001-10-01

    A trapped fourth ventricle is a rare clinico-radiological entity producing symptoms suggestive of a progressive posterior fossa mass lesion. It is mainly reported in children as a late complication of lateral ventricular shunting to relieve infantile post-meningitic or post-hemorrhagic hydrocephalus. Optional treatment of the trapped fourth ventricle remains controversial. Placement of fourth ventricular shunting via a conventional midline approach can be fraught with complications in about 40% of the patients. Authors report a successful CT Stereotaxy guided high pressure (80 mm H(2)O) programmable fourth ventriculo-peritoneal shunting via a lateral trans-cerebellar approach in a 14-year-old girl with a trapped fourth ventricle, which occurred as a late complication of ventriculo-peritoneal shunting in her infancy. Her preoperative symptoms of raised intracranial pressure, bobble-head doll syndrome and bilateral abducens palsies completely improved following the surgery. Lateral trans-cerebellar stereotactic placement of the fourth ventricular catheter and the use of high-pressure (low flow) programmable shunt (to avoid complications associated with over drainage) are beneficial in some patients with trapped fourth ventricle. PMID:11532552

  10. Long Term Results (>5 Years) in Patients With Peritoneovenous Shunting for Intractable Ascites: Liver Function and Cancer Mortality

    PubMed Central

    Meakins, Jonathan L.; Wu, Andrew; Smadja, Claude; Bonnet, Patrick; Gouffier, Etienne; Campillo, Bernard

    1989-01-01

    This report is based on twenty-eight (26%) of 107 patients included in a protocol for prospective evaluation of elective peritoneo-venous shunting for intractable ascites in cirrhosis. These patients had no other procedures and survived more than 5 years after the operation. All patients were free of ascites except one in whom it was mild. One patient refused follow-up. Shunt patency was assessed in 23 patients. In 14 patients (60.9%), the shunt was obstructed and the superior vena cava was occluded in 5 of them. In 9 patients (39.1%), the shunt was still functioning. No clinical or biological parameters differentiated these two groups of patients. Of the 24 patients who were alcoholics, 2 abstained completely and 20 significantly reduced their drinking habits. In 25 patients, the Pugh's score improved and was A at the time of the study. Seven patients (25.9%) developed a malignant tumor of the oro-pharynx or digestive tract, all other patients were alive and in good health. This study suggests that patients with intractable ascites treated by a peritoneo-venous shunt may survive for a long period. In patients abstaining from heavy drinking, it may function as a therapeutic bridge permitting spontaneous improvement of liver function. The risk of supervening neoplasms suggests that a continuous follow-up of these patients is warranted. PMID:2487384

  11. Efficient algorithm for optimal force distribution-the compact-dual LP method

    Microsoft Academic Search

    F.-T. Cheng; D. E. Orin

    1990-01-01

    An efficient algorithm, the compact-dual linear programming (LP) method, is presented to solve the force distribution problem. In this method, the general solution of the linear equality constraints is obtained by transforming the underspecified matrix into row-reduced echelon form; then, the linear equality constraints of the force distribution problem are eliminated. In addition, the duality theory of linear programming is

  12. A time-indexed LP-based approach for min-sum job-shop problems

    E-print Network

    Serafini, Paolo

    A time-indexed LP-based approach for min-sum job-shop problems Giuseppe Lancia, Franca Rinaldi propose two time-indexed IP formulations for job-shop scheduling problems with a min-sum objective- indexed formulation which may heavily slow down the computation. Keywords:job-shop, flow-shop, total

  13. (LP)2, an Adaptive Algorithm for Information Extraction from Web-related Texts

    Microsoft Academic Search

    Fabio Ciravegna

    2001-01-01

    LP) 2 is an algorithm for adaptive Information Extraction from Web-related text that induces symbolic rules by learning from a corpus tagged with SGML tags. Induction is performed by bottom-up generalisation of examples in a training corpus. Training is performed in two steps: initially a set of tagging rules is learned; then additional rules are induced to correct mistakes and

  14. Certifying and Repairing Solutions to Large LPs How Good are LP-solvers?

    E-print Network

    Schömer, Elmar

    Certifying and Repairing Solutions to Large LPs How Good are LP-solvers? Marcel Dhiflaoui Stefan- to large-scale LPs. We present results from the netlib benchmark suite. 1 Introduction Linear programming not claim to solve LPs to opti- mality. In fact, they come with hardly any guarantee. Feasi- ble problems

  15. Interpolation of Lost Speech Segments Using LP-HNM Model With Codebook Post-Processing

    Microsoft Academic Search

    Esfandiar Zavarehei; Saeed Vaseghi

    2008-01-01

    This paper presents a method for interpolation of lost speech segments. The interpolation method can be used for packet loss concealment in voice communication over mobile phones, for voice over IP or for restoration of lost segments in speech recordings. The interpolation method employs a combination of a linear prediction (LP) model of the spectral envelope and a harmonic noise

  16. Cross-mesh array antennas for dual LP and CP waves

    Microsoft Academic Search

    T. Kawano; H. Nakamo

    1999-01-01

    A grid array antenna acts as a radiation element of linear polarization. This paper presents the radiation characteristics of two cross-mesh array antennas each composed of two grid array antennas. It is found that the cross-mesh can radiate a dual linearly polarized (LP) wave and a dual circularly polarized (CP) wave. The frequency responses of the gain and axial ratio

  17. A Guide to LP, The Larch Stephen J. Garland and John V. Guttag

    E-print Network

    Garland, Stephen J.

    of knowledge in all aspects of computer systems research. Our current work includes exploring high Equipment Corporation. c Stephen J. Garland and John V. Guttag 1991. Reprinted by permission of the authors. All rights reserved. iv #12;Abstract This guide provides an introduction to LP (the Larch Prover

  18. Experimental Error Filtration for Quantum Communication Over Highly Noisy Channels L.-P. Lamoureux,1

    E-print Network

    Cerf, Nicolas

    Experimental Error Filtration for Quantum Communication Over Highly Noisy Channels L.-P. Lamoureux) Error filtration is a method for encoding the quantum state of a single particle into a higher applications. An alternative method, called error filtration, allows errors to be filtered out during quantum

  19. Explosive Solutions of Stochastic Reaction-Diffusion Equations in Mean Lp

    E-print Network

    Explosive Solutions of Stochastic Reaction-Diffusion Equations in Mean Lp -Norm Pao-Liu Chow, Parabolic It^o equations, It^o's Formula, Positive Solutions, Blow-up of solutions, Explosions. 1 #12 this phenomenon is manifested as the explosion in combustion, reaction diffusion and branching diffusion problems

  20. 76 FR 63918 - Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of Complaint

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-14

    ...OR12-3-000] Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of...App. 13(1), Tesoro Refining and Marketing Company (Complainant) filed a formal...DC 20426. This filing is accessible on-line at http://www.ferc.gov,...

  1. 76 FR 45246 - Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of Complaint

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-28

    ...OR11-19-000] Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of...1992 (EPAct), Tesoro Refining and Marketing Company (Tesoro) filed a formal complaint...DC 20426. This filing is accessible on-line at http://www.ferc.gov,...

  2. 76 FR 49468 - Tesoro Refining and Marketing Company, SFPP, L.P.; Notice of Complaint

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-10

    ...OR11-20-000] Tesoro Refining and Marketing Company, SFPP, L.P.; Notice of...1992 (EPAct), Tesoro Refining and Marketing Company (Complainant) filed a complaint...DC 20426. This filing is accessible on-line at http://www.ferc.gov,...

  3. 76 FR 45247 - Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of Complaint

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-07-28

    ...OR 11-18-000] Tesoro Refining and Marketing Company v. SFPP, L.P.; Notice of...Policy Act of 1992. Tesoro Refining and Marketing Company (Complainant) filed a formal...DC 20426. This filing is accessible on-line at http://www.ferc.gov,...

  4. Lp-bounds for quasi-geostrophic equations via functional analysis

    NASA Astrophysics Data System (ADS)

    de la Llave, Rafael; Valdinoci, Enrico

    2011-08-01

    We give a proof of Lp-bounds for the quasi-geostrophic equation and other non-local equations. The proof uses mainly tools from functional analysis, notably the product formulas (also known as "operator splitting methods") and the Bochner-Pollard subordination identities, hence it could be applicable to other equations.

  5. THE SQUARE ROOT PROBLEM FOR SECOND ORDER, DIVERGENCE FORM OPERATORS WITH MIXED BOUNDARY CONDITIONS ON Lp

    E-print Network

    Paris-Sud XI, Université de

    THE SQUARE ROOT PROBLEM FOR SECOND ORDER, DIVERGENCE FORM OPERATORS WITH MIXED BOUNDARY CONDITIONS, under very general conditions on the domain and the Dirichlet part D of the boundary, the operator - ·µ +1 1/2 with mixed boundary conditions provides a topological isomorphism between W 1,p D () and Lp

  6. Lp-Lq ESTIMATES FOR FUNCTIONS OF THE LAPLACE-BELTRAMI OPERATOR

    E-print Network

    Cowling, Michael

    Lp-Lq ESTIMATES FOR FUNCTIONS OF THE LAPLACE-BELTRAMI'erat* *eur Laplace-Beltrami, e soit [b, 1) le spectre de L (vu comme op'erateur sur L2(X))* *. Si o 2 C Laplace- Beltrami operator on a symmetric space of the noncompact type. The heat and the Poisson

  7. 77 FR 47428 - Accreditation and Approval of Saybolt LP, as a Commercial Gauger and Laboratory

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-08-08

    ...SUMMARY: Notice is hereby given that, pursuant to 19 CFR 151.12 and 19 CFR 151.13, Saybolt LP, 201 Deerwood Glen Drive, Deer Park, TX 77536, has been approved to gauge and accredited to test petroleum and petroleum products, organic chemicals...

  8. 76 FR 50488 - Accreditation and Approval of Saybolt, LP., as a Commercial Gauger and Laboratory

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-08-15

    ...Saybolt, LP, Road 127 KM 13.4 Bo. Magas Arriba, P.R., has been approved to gauge and test petroleum and petroleum products for customs purposes, in accordance with the provisions of 19 CFR 151.12 and 19 CFR 151.13. Anyone...

  9. 76 FR 25229 - Special Conditions: Gulfstream Aerospace LP (GALP) Model G250 Airplane, Dynamic Test Requirements...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-05-04

    These special conditions are issued for the Gulfstream Aerospace LP (GALP) model G250 airplane. This airplane will have a novel or unusual design feature associated with dynamic test requirements for side-facing, single-occupant seats. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for this design feature. These special conditions contain the......

  10. 76 FR 76802 - Riverside Micro-Cap Fund II, L.P.; Notice Seeking Exemption Under Section 312 of the Small...

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  13. Detection of LP2086 on the cell surface of Neisseria meningitidis and its accessibility in the presence of serogroup B capsular polysaccharide.

    PubMed

    McNeil, Lisa K; Murphy, Ellen; Zhao, Xiao-Juan; Guttmann, Stephen; Harris, Shannon L; Scott, Adrienne A; Tan, Cuiwen; Mack, Michelle; DaSilva, Ida; Alexander, Kristin; Mason, Kathryn; Jiang, Han-Qing; Zhu, Duzhang; Mininni, Terri L; Zlotnick, Gary W; Hoiseth, Susan K; Jones, Thomas R; Pride, Michael W; Jansen, Kathrin U; Anderson, Annaliesa S

    2009-05-26

    The outer membrane protein LP2086, a human factor H binding protein, is undergoing clinical trials as a vaccine against invasive serogroup B meningococcal (MnB) disease. As LP2086 is a surface protein, expression of capsular polysaccharide could potentially limit accessibility of anti-LP2086 antibodies to LP2086 expressed on the surface of bacteria. To determine whether variability in expression levels of the serogroup B capsule (Cap B) might interfere with accessibility of anti-LP2086 antibody binding to LP2086, we evaluated the ability of anti-Cap B and anti-LP2086 antibodies to bind to the surface of 1263 invasive clinical MnB strains by flow cytometry. One of the anti-LP2086 monoclonal antibodies used recognizes virtually all LP2086 sequence variants. Our results show no correlation between the amount of Cap B expressed and the binding of anti-LP2086 antibodies. Furthermore, the susceptibility of MnB bacteria to lysis by anti-LP2086 immune sera was independent of the level of Cap B expressed. The data presented in this paper demonstrates that Cap B does not interfere with the binding of antibodies to LP2086 expressed on the outer membrane of MnB clinical isolates. PMID:19200847

  14. Effects of LC shunting on the Shapiro steps features of Josephson junction

    NASA Astrophysics Data System (ADS)

    Shukrinov, Yu. M.; Rahmonov, I. R.; Kulikov, K. V.; Seidel, P.

    2015-05-01

    We study an effect of external radiation on the dynamics of Josephson junction shunted by an LC circuit. When the Josephson frequency is equal to the frequency of the circuit, additional stable resonant circuit branches appear in the IV-characteristic of the junction. The branches occur on the stable side of a narrow resonance peak, while the other peak side has a negative slope and is unstable. We show that the amplitude dependence of the Shapiro step width crucially changes when the Shapiro step is on the resonant circuit branch. These effects might give very important advantages for methods and technologies that exploit the response of Josephson junctions to microwave fields.

  15. Method of making an ion beam sputter-etched ventricular catheter for hydrocephalus shunt

    NASA Technical Reports Server (NTRS)

    Banks, B. A. (inventor)

    1984-01-01

    The centricular catheter comprises a multiplicity of inlet microtubules. Each microtubule has both a large opening at its inlet end and a multiplicity of microscopic openings along its lateral surfaces. The microtubules are perforated by an ion beam sputter etch technique. The holes are etched in each microtubule by directing an ion beam through an electro formed mesh mask producing perforations having diameters ranging from about 14 microns to about 150 microns. This structure assures a reliable means for shunting cerebrospinal fluid from the cerebral ventricles to selected areas of the body.

  16. Biliary Obstruction After Transjugular Intrahepatic Portosystemic Shunt Placement in a Patient With Budd-Chiari Syndrome

    PubMed Central

    Korrapati, Praneet; Komanduri, Srinadh

    2015-01-01

    A 20-year-old male presented with 2 months of progressive abdominal distension due to ascites and Budd-Chiari syndrome. He underwent transjugular intrahepatic portosystemic shunt (TIPS) placement, but soon after had elevated liver enzymes. MRCP revealed mild left intrahepatic biliary dilatation without stones or obvious stricture. Endoscopic retrograde cholangiopancreatography (ERCP) demonstrated a focal stricture due to compression by the TIPS. The stricture was dilated and a 10 Fr x 15-cm plastic stent was placed with excellent biliary drainage. The patient's symptoms and liver tests normalized within 1 week. This is the first case of biliary obstruction due to TIPS placement effectively managed by ERCP.

  17. A comprehensive theoretical and experimental study of coplanar waveguide shunt stubs

    NASA Technical Reports Server (NTRS)

    Dib, Nihad I.; Ponchak, George E.; Katehi, Linda P. B.

    1993-01-01

    A comprehensive theoretical and experimental study of straight and bent coplanar waveguide (CPW) shunt stubs is presented. In the theoretical analysis, the CPW is assumed to be inside a cavity, while, the experiments are performed on open structures. A hybrid technique was developed to analyze the CPW discontinuities which proved to be accurate since the theoretical and experimental results agree very well. The effect of the cavity resonances on the behavior of the stubs with and without air-bridges is investigated. In addition, the encountered radiation loss due to the discontinuities is evaluated experimentally.

  18. Biliary Obstruction After Transjugular Intrahepatic Portosystemic Shunt Placement in a Patient With Budd-Chiari Syndrome.

    PubMed

    Korrapati, Praneet; Bidari, Kiran; Komanduri, Srinadh

    2015-01-01

    A 20-year-old male presented with 2 months of progressive abdominal distension due to ascites and Budd-Chiari syndrome. He underwent transjugular intrahepatic portosystemic shunt (TIPS) placement, but soon after had elevated liver enzymes. MRCP revealed mild left intrahepatic biliary dilatation without stones or obvious stricture. Endoscopic retrograde cholangiopancreatography (ERCP) demonstrated a focal stricture due to compression by the TIPS. The stricture was dilated and a 10 Fr x 15-cm plastic stent was placed with excellent biliary drainage. The patient's symptoms and liver tests normalized within 1 week. This is the first case of biliary obstruction due to TIPS placement effectively managed by ERCP. PMID:26157927

  19. A single PWM section solar array shunt switching unit with an active ripple filter

    SciTech Connect

    Cho, B.H. [Seoul National Univ. (Korea, Republic of). Dept. of Electrical Engineering; Lee, D.H. [Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Electrical Engineering

    1995-12-31

    A single pulse-width-modulation (PWM) section shunt switching unit (SSU) for multi-kilowatt space power systems is presented. Due to the output capacitance of the solar cell, the PWM section in the array draws a pulsating current, which must be suppressed with a large filter inductor for each section. Proposed design uses a single designated PWM section with an active inductance enhancement filter. This leads to drastic reduction in size and weight of the SSU compared to the existing designs for the Space Station and Earth Observation System (EOS). A prototype has been designed and tested.

  20. Hepatic Veins and Inferior Vena Cava Thrombosis in a Child Treated by Transjugular Intrahepatic Portosystemic Shunt

    SciTech Connect

    Carnevale, Francisco Cesar, E-mail: fcarnevale@uol.com.br; Santos, Aline Cristine Barbosa [Sao Paulo University Medical School, Interventional Radiology Unit, Radiology Institute, Hospital das Clinicas (Brazil); Tannuri, Uenis [Sao Paulo University Medical School, Liver Transplantation Unit, Children's Institute, Hospital das Clinicas (Brazil); Cerri, Giovanni Guido [Sao Paulo University Medical School, Interventional Radiology Unit, Radiology Institute, Hospital das Clinicas (Brazil)

    2010-06-15

    We report the case of a 9-year-old boy with portal hypertension, due to Budd-Chiari syndrome, and retrohepatic inferior vena cava thrombosis, submitted to a transjugular intrahepatic portosystemic shunt (TIPS) by connecting the suprahepatic segment of the inferior vena cava directly to the portal vein. After 3 months, the withdrawal of anticoagulants promoted the thrombosis of the TIPS. At TIPS revision, thrombosis of the TIPS and the main portal vein and clots at the splenic and the superior mesenteric veins were found. Successful angiography treatment was performed by thrombolysis and balloon angioplasty of a severe stenosis at the distal edge of the stent.

  1. Seizure Control of Current Shunt on Rats with Temporal Lobe Epilepsy and Neocortical Epilepsy

    PubMed Central

    Zhang, Limin; Liang, Shuli; Zhang, Guojun; Liu, Zhizhong; Lv, Hong; Fang, Fang; Wang, Yajie; Zhang, Shaohui; Kang, Xixiong

    2014-01-01

    Purpose To examine the effects of current shunt on rats with temporal lobe epilepsy and neocortex epilepsy. Experimental Design A kainic acid (KA)-induced model of temporal lobe seizure and a penicillin-induced model of neocortical partial seizure were used in this study. Rats of each model were randomly allocated into two groups: control and model groups. The model group was further divided into the KA or penicillin group, sham conduction group and conduction group. The current shunt was realized through the implantation of a customized conduction electrode. After surgery, electroencephalogram (EEG) was recorded for two hours for each rat under anesthesia. Subsequently, the rats were video monitored for 72 h to detect the occurrence of behavioral seizures upon awakening. The average number and duration of seizures on EEG and the number of behavioral seizures were measured. Results In KA model, the number of total EEG seizures in conduction group (9.57±2.46) was significantly less than that in sham conduction group (15.13±3.45) (p<0.01). The duration of EEG seizures in conduction group (26.13±7.81 s) was significantly shorter than that in sham conduction group (34.17±7.25 s) (p?=?0.001). A significant reduction of behavioral seizures was observed in the conduction group compared with KA (p?=?0.000) and sham conduction groups (p?=?0.000). In penicillin model, there was a 61% reduction in total EEG seizures in conduction group compared with sham conduction group (p<0.01), and the duration of EEG seizures in conduction group (6.29±2.64 s) was significantly shorter than that in the sham conduction group (12.07±3.81 s) (p?=?0.002). A significant reduction of behavioral seizures was observed in conduction group compared with penicillin (p<0.01) and sham conduction groups (p<0.01). Conclusion Current shunt effectively reduces the onset and severity of seizures. Current shunt therapy could be an effective alternative minimally invasive approach for temporal lobe epilepsy and neocortex epilepsy. PMID:24497949

  2. Periodic solution for state-dependent impulsive shunting inhibitory CNNs with time-varying delays.

    PubMed

    ?ayl?, Mustafa; Y?lmaz, Enes

    2015-08-01

    In this paper, we consider existence and global exponential stability of periodic solution for state-dependent impulsive shunting inhibitory cellular neural networks with time-varying delays. By means of B-equivalence method, we reduce these state-dependent impulsive neural networks system to an equivalent fix time impulsive neural networks system. Further, by using Mawhin's continuation theorem of coincide degree theory and employing a suitable Lyapunov function some new sufficient conditions for existence and global exponential stability of periodic solution are obtained. Previous results are improved and extended. Finally, we give an illustrative example with numerical simulations to demonstrate the effectiveness of our theoretical results. PMID:25965769

  3. Cross-limb vascular shunting as an auxiliary to major limb revascularisation.

    PubMed

    Lee, J W; Pan, S C; Lin, Y T; Chiu, H Y

    2002-07-01

    A 40-year-old male motorcyclist suffered a near-total amputation of his right foot. His limb was successfully salvaged with the aid of a cross-leg vascular shunt. Temporary arterial flow from the contralateral limb was transmitted via a pressure monitor tube to perfuse the avulsed part. This allowed the surgeon to carry out unhurried wound debridement, dissection of vital structures and skeletal fixation. The cannulation port was placed well distal to the proposed definitive anas<$>tomosis, to reduce damage to the endothelium. This procedure could be a valuable adjunct in major limb replantation, particularly in cases of prolonged ischaemia. PMID:12372377

  4. Molecular characterization and structural instability of the industrially important composite metabolic plasmid pLP712.

    PubMed

    Wegmann, Udo; Overweg, Karin; Jeanson, Sophie; Gasson, Mike; Shearman, Claire

    2012-12-01

    The widely used plasmid-free Lactococcus lactis strain MG1363 was derived from the industrial dairy starter strain NCDO712. This strain carries a 55.39 kb plasmid encoding genes for lactose catabolism and a serine proteinase involved in casein degradation. We report the DNA sequencing and annotation of pLP712, which revealed additional metabolic genes, including peptidase F, d-lactate dehydrogenase and ?-keto acid dehydrogenase (E3 complex). Comparison of pLP712 with other large lactococcal lactose and/or proteinase plasmids from L. lactis subsp. cremoris SK11 (pSK11L, pSK11P) and the plant strain L. lactis NCDO1867 (pGdh442) revealed their close relationship. The plasmid appears to have evolved through a series of genetic events as a composite of pGdh442, pSK11L and pSK11P. We describe in detail a scenario by which the metabolic genes relevant to the growth of its host in a milk environment have been unified on one replicon, reflecting the evolution of L. lactis as it changed its biological niche from plants to dairy environments. The extensive structural instability of pLP712 allows easy isolation of derivative plasmids lacking genes for casein degradation and/or lactose catabolism. Plasmid pLP712 is transferable by transduction and conjugation, and both of these processes result in significant molecular rearrangements. We report the detailed molecular analysis of insertion sequence element-mediated genetic rearrangements within pLP712 and several different mechanisms, including homologous recombination and adjacent deletion. Analysis of the integration of the lactose operon into the chromosome highlights the fluidity of the MG1363 integration hotspot and the potential for frequent movement of genes between plasmids and chromosomes in Lactococcus. PMID:23023974

  5. Developmental basis of severe neural tube defects in the loop-tail (Lp) mutant mouse: use of microsatellite DNA markers to identify embryonic genotype.

    PubMed

    Copp, A J; Checiu, I; Henson, J N

    1994-09-01

    Mouse embryos homozygous for the mutation loop-tail (Lp) develop lethal defects in which the neural tube remains open from the hindbrain to the caudal extremity, a condition that closely resembles the human malformation craniorachischisis. Heterozygotes develop tail defects and occasional spina bifida, but are generally viable. In order to study the early development of these defects, it is necessary to determine the genotype of embryos at stages prior to the first appearance of the morphological abnormalities. We used a microsatellite DNA sequence, Crp, that is closely linked to the Lp locus and which segregates polymorphic variants in matings between Lp/+ mice, thus permitting identification of embryos of Lp/Lp, Lp/+ and +/+ genotypes. We found that the severe phenotype craniorachischisis is present at 9.5 and 10.5 days of gestation only in Lp/Lp embryos in utero, whereas Lp/+ and +/+ littermates show neural tube closure throughout most of the body axis. The open neural tube phenotype also develops in Lp/Lp embryos growing in whole embryo culture. A small proportion of Lp/+ embryos were found to develop this phenotype in vitro, but only when culture conditions were suboptimal. Analysis of 8.5-day embryos revealed that the initial defect in Lp/Lp embryos is failure to initiate neural tube closure at the cervical/hindbrain boundary when the embryo has 6-7 somites. Thereafter, the neural tube remains open throughout the body axis, with the exception of the midbrain and forebrain where neural tube closure is initiated independently. Closure at the midbrain/forebrain boundary does not appear to be defective in Lp/Lp embryos. Heterozygous Lp/+ embryos initiate neural tube closure at the cervical/hindbrain boundary with a slight delay compared with +/+ littermates. Moreover, at 10.5 days of gestation, Lp/+ embryos undergo delayed closure of the posterior neuropore. Thus, Lp/+ embryos are defective in several aspects of the neurulation process. The pattern of delayed neuropore closure in Lp/+ embryos resembles that caused by the ct and Sp mutations and is likely to be responsible for the development of tail defects (i.e., looped tails) and spina bifida in Lp/+ mice. The use of microsatellite markers to determine the genotype of mutant embryos has general application: microsatellites are widespread throughout the mouse genome, so that informative sequences are likely to be available with close linkage to the majority of mutant genes. Moreover, polymorphisms can be detected using the polymerase chain reaction, making it possible to determine the genotype of very early embryos when only small amounts of material are available. PMID:8088438

  6. Acute respiratory arrest. A complication of malformation of the shunt in children with myelomeningocele and Arnold-Chiari malformation.

    PubMed

    Tomita, T; McLone, D G

    1983-02-01

    Three children had hydrocephalus associated with myelomeningocele and the Arnold-Chiari malformation. They all experienced neck pain and opisthotonos, followed by the sudden onset of respiratory arrest as a result of the malfunction of a CSF shunt. There were no changes in pupillary response, and each patient remained alert until shortly before the respiratory arrest. Prompt surgical revision of the CSF shunt was carried out, and all three patients recovered. The mechanism of acute respiratory arrest seems to be acute compression of the brainstem as a result of hydrocephalus. The supratentorial pressure is direct on the posterior fossa structures through the enlarged tentorial opening, which is one of the characteristics of the brain in the Arnold-Chiari malformation. Sudden respiratory arrest, a life-threatening complication, is a result of a malfunction of the CSF shunt in children with myelomeningocele and requires prompt surgical decompression. PMID:6849301

  7. Increasing the reliability of the shutdown of 500 - 750-kV overhead lines equipped with shunt reactors in an unsuccessful three-phase automatic repeated closure cycle

    SciTech Connect

    Kuz'micheva, K. I.; Merzlyakov, A. S.; Fokin, G. G. [JSC 'R and D Center at Federal Grid Company of the United Power System' (Russian Federation)

    2013-05-15

    The reasons for circuit-breaker failures during repeated disconnection of 500 - 750 kV overhead lines with shunt reactors in a cycle of unsuccessful three-phase automatic reconnection (TARC) are analyzed. Recommendations are made for increasing the operating reliability of power transmission lines with shunt reactors when there is unsuccessful reconnection.

  8. Study of weakly damped superconducting quantum interference devices operated in different bias modes in presence of external shunt resistance

    NASA Astrophysics Data System (ADS)

    Zeng, Jia; Zhang, Yi; Mück, Michael; Krause, Hans-Joachim; Braginski, Alex I.; Kong, Xiangyan; Xie, Xiaoming; Offenhäusser, Andreas; Jiang, Mianheng

    2013-09-01

    We experimentally studied weakly damped superconducting quantum interference devices (SQUIDs) shunted by an external resistor Rs and operated in either current- or voltage-bias mode. The SQUID parameters, such as the flux-to-voltage transfer coefficient ?V/?? and the dynamic resistance Rd, are reduced due to Rs, while the SQUID intrinsic noise remains unchanged. The reduced parameters can be enhanced again by using voltage feedback circuitry. Furthermore, Rs can be used to damp the SQUID in order to avoid the appearance of hysteresis or oscillation in SQUID characteristics. SQUID shunted by small Rs is always operated in mixed-bias mode.

  9. The results of systems tests of the 500 kV busbar controllable shunting reactor in the Tavricheskaya substation

    SciTech Connect

    Gusev, S. I. [JSC 'FSK EES' (Russian Federation); Karpov, V. N.; Kiselev, A. N.; Kochkin, V. I. [Scientific-Research Institute of Electric Power Engineering (VNIIE) - Branch of the JSC 'NTTs Elektroenergetiki', (Russian Federation)

    2009-09-15

    The results of systems tests of the 500 kV busbar magnetization-controllable shunting reactor (CSR), set up in the Tavricheskaya substation, including measurements of the quality of the electric power, the harmonic composition of the network currents of the reactor for different values of the reactive power consumed, the determination of the regulating characteristics of the reactor, the speed of response of the shunting reactor in the current and voltage stabilization modes, and also the operation of the reactor under dynamic conditions for different perturbations, are presented. The results obtained are analyzed.

  10. Intravascular Ultrasound Guidance for Transjugular Intrahepatic Portosystemic Shunt Procedure in a Swine Model

    SciTech Connect

    Kew, Jacqueline; Davies, Roger P. [North Western Adelaide Health Service, Queen Elizabeth Hospital Campus, 28 Woodville Road, Woodville South, Adelaide, 5011, South Australia, Department of Radiology (Australia)

    2004-01-15

    A new method is described for guiding hepato-portalvenous puncture using a longitudinal side-view intravascular ultrasound(L-IVUS) transducer to assist in the performance of transjugularintrahepatic portosystemic shunt (TIPS) in three Australian swine.Simultaneous L-IVUS with an AcuNav (registered) 5-10 MHz 10 Fr transducer(Acuson Corporation, Mountain View, CA, USA) and fluoroscopy guidance was used to image and monitor the hepatic to portal venous puncture,dilatation of the tract, and deployment of the TIPS stent. Flow through the shunt could be demonstrated with both L-IVUS and angiography. TIPS was successful in all swine. The time for portal vein puncture once the target portal vein was identified was reduced at each attempt. The number of portal vein puncture attempts was 2, 1, and 1. No post-procedural complication was evident. L-IVUS-guided TIPS is practical and has the potential to improve safety by permitting simultaneous ultrasound and fluoroscopic imaging of the needle and target vascular structures. This technique allows for a more streamlined approach to TIPS, decreasing the fluoroscopic time (hence,decreasing the radiation exposure to the staff and patient) and anesthetic time. In addition, there are improved safety benefits obviating the need for wedged portography, facilitating avoidance of bile duct and hepatic arterial puncture, and minimizing hepatic injury by decreasing liver capsular puncture and the attendant risks.

  11. Decreased carbon shunting from glucose toward oxidative metabolism in diet-induced ketotic rat brain.

    PubMed

    Zhang, Yifan; Zhang, Shenghui; Marin-Valencia, Isaac; Puchowicz, Michelle A

    2015-02-01

    The mechanistic link of ketosis to neuroprotection under certain pathological conditions continues to be explored. We investigated whether chronic ketosis induced by ketogenic diet results in the partitioning of ketone bodies toward oxidative metabolism in brain. We hypothesized that diet-induced ketosis results in increased shunting of ketone bodies toward citric acid cycle and amino acids with decreased carbon shunting from glucose. Rats were fed standard (STD) or ketogenic (KG) diets for 3.5 weeks and then infused with [U-(13) C]glucose or [U-(13) C]acetoacetate tracers. Concentrations and (13) C-labeling pattern of citric acid cycle intermediates and amino acids were analyzed from brain homogenates using stable isotopomer mass spectrometry analysis. The contribution of [U-(13) C]glucose to acetyl-CoA and amino acids decreased by ~ 30% in the KG group versus STD, whereas [U-(13) C]acetoacetate contributions were more than two-fold higher. The concentration of GABA remained constant across groups; however, the (13) C labeling of GABA was markedly increased in the KG group infused with [U-(13) C]acetoacetate compared to STD. This study reveals that there is a significant contribution of ketone bodies to oxidative metabolism and GABA in diet-induced ketosis. We propose that this represents a fundamental mechanism of neuroprotection under pathological conditions. PMID:25314677

  12. Common carotid artery duplex for the bubble test to detect right-to-left shunt.

    PubMed

    Censori, Bruno; Partziguian, Tania; Poloni, Marco

    2010-04-01

    We prospectively compared the bubble test with agitated saline for right-to-left shunt using transcranial Doppler (TCD) of the right middle cerebral artery and second harmonic imaging duplex of the right common carotid artery (CCA) in 100 consecutive patients. Microembolic signals (MES) were counted offline. MES were classified into 6 classes: absent (class 0), 1-10 MES (class 1), 11-20 MES (class 2), 21-30 MES (class 3), 31-50 MES (class 4) and >50 MES or "curtain effect" (class 5). For TCD, classes 2-5 combined (i.e., "large" shunts), the sensitivity of duplex with the Valsalva maneuver was 95.3%, the specificity was 100%, the positive predictive 100%, the negative predictive value 96.6% and accuracy 98.0%. Second harmonic imaging duplex of the CCA may substitute TCD for the bubble test when an adequate cranial bone window is not available. This technique may also greatly increase the number of facilities where the bubble test can be carried out. However, tests with few or no MES need to be confirmed by TCD or transesophageal echocardiography. PMID:20350683

  13. Solutions for transients in arbitrarily branching cables: I. Voltage recording with a somatic shunt.

    PubMed Central

    Major, G; Evans, J D; Jack, J J

    1993-01-01

    An analytical solution is derived for voltage transients in an arbitrarily branching passive cable neurone model with a soma and somatic shunt. The response to injected currents can be represented as an infinite series of exponentially decaying components with different time constants and amplitudes. The time constants of a given model, obtained from the roots of a recursive transcendental equation, are independent of the stimulating and recording positions. Each amplitude is the product of three factors dependent on the corresponding root: one constant over the cell, one varying with the input site, and one with the recording site. The amplitudes are not altered by interchanging these sites. The solution reveals explicitly some of the parameter dependencies of the responses. An efficient recursive root-finding algorithm is described. Certain regular geometries lead to "lost" roots; difficulties associated with these can be avoided by making small changes to the lengths of affected segments. Complicated cells, such as a CA1 pyramid, produce many closely spaced time constants in the range of interest. Models with large somatic shunts and dendrites of unequal electrotonic lengths can produce large amplitude waveform components with surprisingly slow time constants. This analytic solution should complement existing passive neurone modeling techniques. PMID:8369447

  14. Effect of heparin-PVA hydrogel on platelets in a chronic canine arterio-venous shunt.

    PubMed

    Cholakis, C H; Zingg, W; Sefton, M V

    1989-04-01

    Polyvinyl alcohol (PVA) hydrogel, with or without heparin, was reactive towards canine platelets in a chronic arteriovenous shunt as demonstrated by an increase in platelet regeneration time, a systemic decrease in platelet count and transient decrease in platelet serotonin content. Immobilized heparin (heparin-PVA) had no effect whereas unmodified polyethylene was found to be unreactive despite similar levels of platelet deposition as measured by SEM and a higher in vitro reactivity (J. Biomed. Mater. Res., this issue). Twenty-centimeter lengths of hydrogel coated polyethylene tubing were inserted between the arterial and venous portions of the shunt and left in place for 4-6 days, without the complicating artifacts of anticoagulation, anesthesia, or surgical intervention. Regeneration time was measured as the return to normal platelet cyclooxygenase (co) activity after a single 240-mg dose of aspirin, with co activity measured in vitro as malondialdehyde production. Although measuring new platelet production, regeneration time is an indirect measure of platelet consumption, so that the reduced regeneration time seen here was presumed to reflect enhanced material associated consumption and thromboembolism. Like other hydrogels, PVA does not appear to be "thromboadherent" but it does appear thrombogenic. Immobilized heparin had no additional effect, presumably because the platelet response was dominated by the reactivity of the underlying substrate. PMID:2708416

  15. Cranial dural arteriovenous shunts. Part 1. Anatomy and embryology of the bridging and emissary veins.

    PubMed

    Baltsavias, Gerasimos; Parthasarathi, Venkatraman; Aydin, Emre; Al Schameri, Rahman A; Roth, Peter; Valavanis, Anton

    2015-04-01

    We reviewed the anatomy and embryology of the bridging and emissary veins aiming to elucidate aspects related to the cranial dural arteriovenous fistulae. Data from relevant articles on the anatomy and embryology of the bridging and emissary veins were identified using one electronic database, supplemented by data from selected reference texts. Persisting fetal pial-arachnoidal veins correspond to the adult bridging veins. Relevant embryologic descriptions are based on the classic scheme of five divisions of the brain (telencephalon, diencephalon, mesencephalon, metencephalon, myelencephalon). Variation in their exact position and the number of bridging veins is the rule and certain locations, particularly that of the anterior cranial fossa and lower posterior cranial fossa are often neglected in prior descriptions. The distal segment of a bridging vein is part of the dural system and can be primarily involved in cranial dural arteriovenous lesions by constituting the actual site of the shunt. The veins in the lamina cribriformis exhibit a bridging-emissary vein pattern similar to the spinal configuration. The emissary veins connect the dural venous system with the extracranial venous system and are often involved in dural arteriovenous lesions. Cranial dural shunts may develop in three distinct areas of the cranial venous system: the dural sinuses and their interfaces with bridging veins and emissary veins. The exact site of the lesion may dictate the arterial feeders and original venous drainage pattern. PMID:25468011

  16. An Auscultaiting Diagnosis Support System for Assessing Hemodialysis Shunt Stenosis by Using Self-organizing Map

    NASA Astrophysics Data System (ADS)

    Suzuki, Yutaka; Fukasawa, Mizuya; Sakata, Osamu; Kato, Hatsuhiro; Hattori, Asobu; Kato, Takaya

    Vascular access for hemodialysis is a lifeline for over 280,000 chronic renal failure patients in Japan. Early detection of stenosis may facilitate long-term use of hemodialysis shunts. Stethoscope auscultation of vascular murmurs has some utility in the assessment of access patency; however, the sensitivity of this diagnostic approach is skill dependent. This study proposes a novel diagnosis support system to detect stenosis by using vascular murmurs. The system is based on a self-organizing map (SOM) and short-time maximum entropy method (STMEM) for data analysis. SOM is an artificial neural network, which is trained using unsupervised learning to produce a feature map that is useful for visualizing the analogous relationship between input data. The author recorded vascular murmurs before and after percutaneous transluminal angioplasty (PTA). The SOM-based classification was consistent with to the classification based on MEM spectral and spectrogram characteristics. The ratio of pre-PTA murmurs in the stenosis category was much higher than the post-PTA murmurs. The results suggest that the proposed method may be an effective tool in the determination of shunt stenosis.

  17. Ex vivo shunt testing of hydrogel-silicone rubber composite materials.

    PubMed

    Vale, B H; Greer, R T

    1982-07-01

    Hydrogel polymers consisting of HEMA (2-hydroxyethyl methacrylate) alone or co-polymerized with NVP N-(vinyl pyrrolidone) were incorporated into silicone rubber tubing to produce hydrophilic composite materials. Polymerization methods of the interpenetrating network (IPN) and radiation-induced type were used to impregnate the silicone rubber substrates. These methods produced materials with varied wettability (contact angle with water ranged from 57 degrees to 95 degrees) but similar texture. The surface morphology as observed in the scanning electron microscope was the same for all the materials. Four types of composite materials and two sizes of silicone rubber control tubing in a total of 19 dogs were used as ex vivo femoral artery-to-vein (A-V) shunts and were sampled at 5, 15, 30, 45, and 60 min. Data obtained by using scanning electron microscopy (SEM) were used to determine the type and amount of adhering blood cells at the time intervals described. Large platelet aggregates and/or a variable initial response were found to be predictors of shunt failure (occlusion). Most samples showed only varied levels of platelet adhesion, but other cell types were seen in some samples. The adhesion was found to peak in all cases by 30 min and to reach lower levels by 60 min, suggesting that an initial phase of reaction was complete. The course of platelet adhesion for a 60-min period is presented. PMID:7107662

  18. Estimates for the error of approximation of functions in L_p^1 by polynomials and partial sums of series in the Haar and Faber-Schauder systems

    NASA Astrophysics Data System (ADS)

    Vakarchuk, S. B.; Shchitov, A. N.

    2015-04-01

    We find exact estimates for the error of approximation of functions in the classes L_p^1 by polynomials in the Haar system and partial sums of the Faber-Schauder series in the metrics of the spaces L_p. The error in approximating a function f\\in L_p^1 is estimated in terms of the norms of the first derivatives \\Vert f(1)\\Vert L_p and \\Vert f(1)-\\overline S(1)_n(f)\\Vert L_p. The resulting bounds are unimprovable for some values of n.

  19. Portacaval shunting

    MedlinePLUS

    ... Cirrhosis and its sequelae. In: Goldman L, Schafer AI, eds. Cecil Medicine . 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 156. Shah VH, Kamath PS. Small intestinal motor and sensory function and dysfunction. In: Feldmn M, Friedman LS, Brandt ...

  20. Characterization of the human lipoprotein lipase (LPL) promoter: Evidence of two cis-regulatory regions, LP-[alpha] and LP-[beta] of importance for the differentation-linked induction of the LPL gene during adipogenesis

    SciTech Connect

    Enerbaeck, S.; Ohlsson, B.G.; Samuelsson, L.; Bjursell, G. (Univ. of Goeteborg (Sweden))

    1992-10-01

    When preadipocytes differentiate into adipocytes, several differentiation-linked genes are activated. Lipo-protein lipase (LPL) is one of the first genes induced during this process. To investigate early events in adipocyte development, we have focused on the transcriptional activation of the LPL gene. For this purpose, we have cloned and fused different parts of intragenic and flanking sequences with a chloramphenicol acetyltransferase reporter gene. Transient transfection experiments and DNase I hypersensitivity assays indicate that several positive as well as negative elements contribute to transcriptional regulation of the LPL gene. When reporter gene constructs were stably introduced into preadipocytes, we were able to monitor and compare the activation patterns of different promoter deletion mutants at selected time points representing the process of adipocyte development. We could delimit two cis-regulatory elements important for gradual activation of the LPL gene during adipocyte development in vitro. These elements, LP-[alpha] (-702 to -666) and LP-[beta] (-468 to -430), contain a striking similarity to a consensus sequence known to bind the transcription factors HNF-3 and fork head. Results of gel mobility shift assays and DNase I and exonuclease III in vitro protection assays indicate that factors with DNA-binding properties similar to those of the HNF-3/fork head family of transcription factors are present in adipocytes and interact with LP-[alpha] and LP-[beta]. We also demonstrate that LP-[alpha] and LP-[beta] were both capable of conferring a differentiation-linked expression pattern to a heterolog promoter, thus mimicking the expression of the endogenous LPL gene during adipocyte differentiation. These findings indicate that interactions with LP-[alpha] and LP-[beta] could be a part of a differentiation switch governing induction of the LPL gene during adipocyte differentiation. 48 refs., 11 figs.

  1. LP 400-22, A Very Low Mass and High-Velocity White Dwarf

    NASA Technical Reports Server (NTRS)

    Kawka, Adela; Vennes, Stephane; Oswalt, Terry D.; Smith, J. Allyn; Silvestri, Nicole M.

    2006-01-01

    We report the identification of LP 400-22 (WD 2234+222) as a very low mass and high-velocity white dwarf. The ultraviolet GALEX and optical photometric colors and a spectral line analysis of LP 400-22 show this star to have an effective temperature of 11,080+/-140 K and a surface gravity of log g = 6.32 +/-0.08. Therefore, this is a helium-core white dwarf with a mass of 0.17 M,. The tangential velocity of this white dwarf is 414+/-43 km/s, making it one of the fastest moving white dwarfs known. We discuss probable evolutionary scenarios for this remarkable object.

  2. The field brown dwarf LP 944-20 and the Castor moving group

    E-print Network

    I. Ribas

    2003-01-06

    A reliable age estimation for the field brown dwarf LP 944-20 is accomplished through the analysis of its kinematic properties. The space velocities of this star strongly suggest its membership in the so-called Castor moving group. LP 944-20 can be sensibly assumed to have the group's age, which is estimated to be ~320 Myr, and metal content, which is found to be roughly solar. With these new constrains and the available photometry and lithium abundance, current brown dwarf models are put to a test. Using the IR magnitudes and the lithium diagnostics, the models are able to provide a reasonable description of the brown dwarf's properties (to within a few sigma) but yield an age which is roughly 50% larger than our estimate. Possible reasons for this discrepancy are discussed.

  3. 76 FR 63278 - Bayer CropScience LP; Determination of Nonregulated Status for Cotton Genetically Engineered for...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-12

    ...Determination of Nonregulated Status for Cotton Genetically Engineered for Insect Resistance...determination that a genetically engineered cotton developed by Bayer CropScience LP, designated as TwinLink TM cotton (events T304-40 and GHB119),...

  4. 75 FR 39244 - Arizona Public Service Company, Sequent Energy Management, L.P.; Notice of Joint Petition for...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-08

    ...Service Company, Sequent Energy Management, L.P...Clarification, or in the Alternative, Request for Limited...Company and Sequent Energy Management, L.P. filed with the Federal Energy Regulatory Commission...Clarification, or in the Alternative, Request for...

  5. Dual-LP11 mode 4×4 MIMO-OFDM transmission over a two-mode fiber.

    PubMed

    Al Amin, Abdullah; Li, An; Chen, Simin; Chen, Xi; Gao, Guanjun; Shieh, William

    2011-08-15

    We report successful transmission of dual-LP(11) mode (LP(11a) and LP(11b)), dual polarization coherent optical orthogonal frequency-division multiplexing (CO-OFDM) signals over two-mode fibers (TMF) using all-fiber mode converters. Mode converters based on mechanically induced long-period grating with better than 20 dB extinction ratios are realized and used for interfacing single-mode fiber transmitter and receivers to the TMF. We demonstrate that by using 4×4 MIMO-OFDM processing, the random coupling of the two LP(11) spatial modes can be successfully tracked and equalized with a one-tap frequency-domain equalizer. We achieve successful transmission of 35.3 Gb/s over 26-km two-mode fiber with less than 3 dB penalty. PMID:21935029

  6. 78 FR 42516 - Iroquois Gas Transmission System, L.P.; Notice of Intent To Prepare an Environmental Impact...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-07-16

    ...Transmission System, L.P. (Iroquois) and Constitution Pipeline Company, LLC (Constitution). On September 7, 2012, the FERC issued...Environmental Impact Statement for the Planned Constitution Pipeline Project, [[Page 42517

  7. 77 FR 24723 - AstraZeneca Pharmaceuticals LP; Withdrawal of Approval of a New Drug Application for IRESSA

    Federal Register 2010, 2011, 2012, 2013, 2014

    2012-04-25

    ...application (NDA) for IRESSA (gefitinib) Tablets held by AstraZeneca Pharmaceuticals LP...INFORMATION: FDA approved IRESSA (gefitinib) Tablets on May 2, 2003, under the Agency's...voluntarily withdraw IRESSA (gefitinib) Tablets from the market, because the...

  8. 76 FR 63823 - Special Conditions: Gulfstream Aerospace LP (GALP) Model G280 Airplane Pilot-Compartment View...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-10-14

    ...Aerospace LP (GALP) Model G280 airplane. This...or appropriate safety standards for this design feature...GALP must show that the Model G280 airplane meets the...or appropriate safety standards for the Model G280 airplane...

  9. 75 FR 54661 - Main Street Capital II, LP; Notice of Exemption Under Section 312 of the Small Business...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-08

    ...13 CFR 107.730), Financings which Constitute Conflicts...LP provided a debt/equity financing to National Trench Safety...of the company. The financing is brought within the...because Main Street Equity Interests,...

  10. 75 FR 54661 - Main Street Mezzanine Fund, LP; Notice of Exemption Under Section 312 of the Small Business...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-09-08

    ...13 CFR 107.730), Financings which Constitute Conflicts...LP provided a debt/equity financing to National Trench Safety...of the company. The financing is brought within the...because Main Street Equity Interests, Inc....

  11. Dual-LP11 mode 4x4 MIMO-OFDM transmission over a two-mode fiber

    NASA Astrophysics Data System (ADS)

    Amin, Abdullah Al; Li, An; Chen, Simin; Chen, Xi; Gao, Guanjun; Shieh, William

    2011-08-01

    We report successful transmission of dual-LP11 mode (LP11a and LP11b), dual polarization coherent optical orthogonal frequency-division multiplexing (CO-OFDM) signals over two-mode fibers (TMF) using all-fiber mode converters. Mode converters based on mechanically induced long-period grating with better than 20 dB extinction ratios are realized and used for interfacing single-mode fiber transmitter and receivers to the TMF. We demonstrate that by using 4x4 MIMO-OFDM processing, the random coupling of the two LP11 spatial modes can be successfully tracked and equalized with a one-tap frequency-domain equalizer. We achieve successful transmission of 35.3 Gb/s over 26-km two-mode fiber with less than 3 dB penalty.

  12. 75 FR 71122 - Erie Boulevard Hydropower L.P.; Notice of Scoping Meetings and Environmental Site Review

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-11-22

    ...DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Project No. 7518-012--New York] Erie Boulevard Hydropower L.P.; Notice of Scoping Meetings and Environmental Site Review November 15, 2010. Commission staff will be...

  13. 76 FR 59682 - Erie Boulevard Hydropower L.P.; Notice of Dispute Resolution Panel Meeting and Technical Conference

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-09-27

    ...DEPARTMENT OF ENERGY Federal Energy Regulatory Commission [Project No. 7518-012] Erie Boulevard Hydropower L.P.; Notice of Dispute Resolution Panel Meeting and Technical Conference On September 16, 2011, Commission...

  14. 75 FR 8921 - Grant of Authority for Subzone Status; Brightpoint North America L.P. (Cell Phone Kitting and...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-02-26

    ...Brightpoint North America L.P. (Cell Phone Kitting and Distribution) Indianapolis...special-purpose subzone at the cell phone kitting and distribution facilities...to the kitting and distribution of cell phones at the facilities of...

  15. Frequency limitation of a high-efficiency class E tuned RF power amplifier due to a shunt capacitance

    Microsoft Academic Search

    Arturo Mediano; Pilar Molina

    1999-01-01

    Class E tuned power amplifiers and converters have been mathematically analysed to obtain equations that govern the circuit behaviour. In this paper, further study is presented leading to concepts such as optimum and maximum susceptances, which deeply analysed, result in an analytical method to determine the maximum frequency of operation for a class E amplifier with a linear shunt capacitance

  16. A shunt active filter based on voltage detection for harmonic termination of a radial power distribution line

    Microsoft Academic Search

    Hirofumi Akagi; Hideaki Fujita; Keiji Wada

    1998-01-01

    This paper is focused on a shunt active filter based on detection of harmonic voltages at the point of installation. The objective of the active filter is to attenuate harmonic propagation resulting from series\\/parallel resonance between capacitors for power factor correction and line inductors in a power distribution line. The active filter acts as a low resistor to the external

  17. Transjugular intrahepatic portasystemic stent shunting for control of acute and recurrent upper gastrointestinal haemorrhage related to portal hypertension

    Microsoft Academic Search

    K J Simpson; N Chalmers; D N Redhead; N D Finlayson; I A Bouchier; P C Hayes

    1993-01-01

    The insertion of a transjugular intrahepatic portasystemic stent shunt (TIPSS) was evaluated in 22 patients with recurrent upper gastrointestinal haemorrhage related to portal hypertension (bleeding from oesophageal varices 10, gastric varices six, portal hypertensive gastropathy six). TIPSS was successfully performed electively in 15 patients and as an emergency in three patients. Twelve patients have had no further admissions with bleeding

  18. Combined effects of shunt and luminescence coupling on external quantum efficiency measurements of multi-junction solar cells

    Microsoft Academic Search

    Jing-Jing Li; Swee H. Lim; Charles R. Allen; Yong-Hang Zhang

    2011-01-01

    The combined effects of shunt and luminescence coupling on the measurement artifacts of external quantum efficiency (EQE) are modeled and analyzed for the top, middle and bottom subcells of multi-junction solar cells. The measurement artifacts of a Ge bottom cell caused by the combined effects are explained with the models.

  19. STABLE ISOTOPES AND MASS SPECTROMETRY. FLUX ANALYSIS OF THE FRUCTOSE-6-P-PHOSPHOKETOLASE SHUNT PATHWAY IN BIFIDOBACTERIUM.

    Technology Transfer Automated Retrieval System (TEKTRAN)

    The enumeration of the human gut bacterium as Bifidobacterium is difficult; the most direct test is based on demonstration of fructose-6 phosphate phosphoketolase (F6PPK) activity in cellular extracts. This is the key enzyme of the so-called "Bifido shunt," a unique metabolic pathway that character...

  20. [Aneurysm of the interatrial septum and right-to-left shunt during biventricular infarction. Diagnosis by transesophageal echocardiography].

    PubMed

    Abassade, P; Lhosmot, J P; Voyer, C; Lebard, C; Gobet, L; Baudouy, P Y

    2000-01-01

    A right-to-left shunt during infarction with right ventricular extension is a rare and recently described complication. It results from opening of a foramen ovale due to increased right heart pressures. The authors describe another case occurring in a patient with an interatrial septal aneurysm, the diagnosis of which was made by transoesophageal echocardiography. PMID:11227724