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1

Myelography in lumboperitoneal shunts  

Microsoft Academic Search

Lumboperitoneal shunts have become more prevalent since the introduction of Silastic tubing. One disadvantage of this procedure is the difficulty in obtaining a subsequent myelogram. In the presence of a lumboperitoneal shunt, it may be advisable to modify the usual technique in obtaining a satisfactory myelogram. Use a low lumber puncture for a lumbar study, a C1-2 puncture for the

A. Wand

1982-01-01

2

Percutaneous lumboperitoneal shunt. Technical note.  

PubMed

The authors describe a new catheter for use in percutaneous lumboperitoneal shunting, designed to overcome the problem of kinking. They present their experience with the catheter in 14 patients. PMID:1194948

Spetzler, R F; Wilson, C B; Grollmus, J M

1975-12-01

3

Percutaneous lumboperitoneal shunt: review of 130 cases.  

PubMed

One hundred thirty consecutive cases of percutaneous lumboperitoneal shunting are reviewed. The efficacy of this procedure in the management of cerebrospinal fluid fistulas and bulging craniotomies is documented. The place of lumboperitoneal shunts in the management of communicating hydrocephalus, with particular emphasis on "normal pressure" hydrocephalus, is discussed. PMID:7383288

Selman, W R; Spetzler, R F; Wilson, C B; Grollmus, J W

1980-03-01

4

Acquired Chiari I Malformation and Syringomyelia after Valveless Lumboperitoneal Shunt in Infancy  

Microsoft Academic Search

The authors present the case of a 13-year-old boy who experienced frequent disabling episodes of typical postural induced headaches, which revealed a Chiari I malformation, syringomyelia and cervical spinal cord edema. This boy had received a valveless lumboperitoneal (LP) shunt at the age of 18 months for macrocephaly. At this time, cranial CT scan showed moderate enlargement of the subarachnoid

Laurent Riffaud; Carolina Moughty; Pierre-Louis Henaux; Claire Haegelen; Xavier Morandi

2008-01-01

5

A new mechanism of cerebrospinal fluid leakage after lumboperitoneal shunt: a theory of shunt side hole-case report.  

PubMed

Cerebrospinal fluid (CSF) overdrainage after lumboperitoneal (LP) shunt placement for the patients with idiopathic normal pressure hydrocephalus (iNPH) is mainly caused by insufficient management of pressure settings of the shunt valve and/or siphon effect of shunt systems induced by the patient's postural changes. We here report a unique case of intracranial hypotension (IH) due to CSF leakage after LP shunt placement in which another mechanism leads to the CSF leakage. A 67-year-old man suffered from persistent headache worsening with postural change 2 months after LP shunt reconstruction for iNPH. Brain computed tomography scan showed bilateral chronic subdural hematomas (CSDH). Lumbar images including shuntography and magnetic resonance imaging showed the tip of the lumbar catheter was spontaneously pulled out close to the dura mater with expansion of the epidural space due to CSF leakage from a shunt side hole of the lumbar catheter to the epidural space. Shunt removal and subsequent irrigation of CSDH improved his headache. CSF leakage in our case differs from those in previous reports, because early and enormous CSF leakage into the epidural space can be explained only by a different mechanism through a side hole just located in the epidural space in our case. We must pay attention to the possibility of this rare cause of IH due to CSF leakage in patients suffering from postural headache after LP shunt placement. PMID:24305015

Matsubara, Teppei; Ishikawa, Eiichi; Hirata, Koji; Matsuda, Masahide; Akutsu, Hiroyoshi; Masumoto, Tomohiko; Zaboronok, Alexander; Matsumura, Akira

2014-07-15

6

Use of blunt scalp hooks for abdominal procedure in lumboperitoneal shunt placement: technical note.  

PubMed

In obese patients, we often find difficulty in laparotomy for placing a lumboperitoneal shunt catheter. The authors introduced an easy technique to get a sufficiently wide and shallow operative field through small abdominal incision in obese people. Four blunt scalp hooks and rubber bands, commonly used in craniotomy, were prepared. The fat layer and the rectus abdominis muscle layer were retracted and pulled up using these hooks. Blunt scalp hooks were useful for safe and effective retraction of abdominal wall, which made a sufficient and shallow operative field. PMID:24759096

Kawahara, Takashi; Higashi, Takuichiro; Tokimura, Hiroshi; Arita, Kazunori; Atsuchi, Masamichi; Takasaki, Koji

2014-07-15

7

[Improvement of cerebral hemodynamic and metabolic parameters in a patient who presented intracranial hypertension due to superior sinus thrombosis after lumbo-peritoneal shunt: case report].  

PubMed

Cerebral hemodynamic and metabolic changes in intracranial hypertension associated with sinus thrombosis have not been well documented. We report pre- and post-treatment changes in cerebral hemodynamic and metabolic parameters in a 50-year-old male who presented intracranial hypertension due to sinus thrombosis, using single-photon emission computed tomography (SPECT) and positron emission tomography (PET). He complained of headache, nausea and double vision and was admitted to our hospital. Neurological examinations on admission revealed papilledema on both sides. Cerebrospinal fluid pressure was 28 mmHg. Cerebral angiography showed occlusion of the superior sagittal sinus and retrograde filling of the ascending cortical veins in the bilateral frontal lobes. 123I-IMP SPECT and 15O-gas PET showed a reduction of cerebral blood flow and oxygen metabolism and an extreme elevation of cerebral blood volume in the bilateral cerebral hemispheres. His complaints resolved after lumbo-peritoneal shunt. Postoperative SPECT/PET studies demonstrated improvement of hemodynamic and metabolic parameters. Intracranial hypertension and associated venous congestion were most likely related to hemodynamic and metabolic abnormalities. PMID:15773319

Hokari, Masaaki; Kuroda, Satoshi; Ishikawa, Tatsuya; Iwasaki, Yoshinobu

2005-03-01

8

Ventriculoperitoneal shunting  

MedlinePLUS

Risks of anesthesia are: Reactions to medications Problems breathing Changes in blood pressure or breathing rate Risks of ventriculoperitoneal shunt placement are: Blood clot or bleeding in the brain Brain swelling Hole in the intestines (bowel ...

9

LP Summer Student Program  

Cancer.gov

D  CCR Home   About CCR   CCR Intranet        Laboratory of Pathology LP Home Clinical Services Basic Sciences Training LP Staff Accessibility of Web Site LP Summer Student Program 2003/2004 Poster Day Images Past Student Images Summer Student Home About

10

Childhood lichen planus (LP).  

PubMed

In adults, lichen planus (LP) is relatively more common than in children. Among 222 cases of LP, there were 25 (11.2%) children in our study. The majority of the cases were females in the age group of 8-14; the youngest child was 3 years old. Papular and linear types of LP were common in children. There was no familial history of LP in any of the cases. The patients with classic LP lesions responded well to dapsone therapy. This study supports the suggestion of Ramsay and Hurley that childhood LP is more common in the tropics. PMID:8478497

Kumar, V; Garg, B R; Baruah, M C; Vasireddi, S S

1993-03-01

11

Polytetrafluoroethylene sponge syringosubarachnoid shunt.  

PubMed

Syringomyelia is condition in which a cyst or cavity forms inside the spinal cavity. Its management always remains a difficult. A variety of surgical techniques have been used in management of syringomyelia. Syringosubarachnoid shunt remains an effective method in management of syringomyelia. Shunt tube obstruction remains an important complication of shunt procedure. We describe a novel technique of use of polytetrafluoroethylene sponge shunt for syringosubarachnoid shunt in patient with large syrinx and Chiari 1 malformation. Polytetrafluoroethylene sponge is a non irritant material with multiple porosities that is less susceptible to blockages or kinking. It could provide a good alternative technique in syringosubarachnoid shunting. PMID:21845589

Chagla, Aadil S; Kansal, Ritesh; Srikant, Balasubramaniam

2011-01-01

12

Complications of Denver Shunt  

PubMed Central

Hepatic hydrothorax secondary to transdiaphragmatic spread of peritoneal fluid can cause respiratory discomfort to the patient. Draining of hydrothorax helps relieve these symptoms. Pleurovenous shunt (Denver shunt) is a relatively non-invasive method of shunting the pleural fluid to the central venous system. Reported complications of pleurovenous shunts are shunt failure, pulmonary edema, post shunt coagulopathy, deep vein thrombosis, and infection. We report a rare case of a leak at the venous end of the catheter that was placed within the right internal jugular vein, resulting in a large collection in the neck.

Perera, Eranga; Bhatt, Shweta; Dogra, Vikram S.

2011-01-01

13

LP Past Summer Student Images  

Cancer.gov

D  CCR Home   About CCR   CCR Intranet        Laboratory of Pathology LP Home Clinical Services Basic Sciences Training LP Staff Accessibility of Web Site LP Past Summer Student Images Coming Soon Back to Summer Student Home About CCR | Clinical

14

Adaptive piezoelectric shunt damping  

Microsoft Academic Search

Piezoelectric shunt damping systems reduce structural vibration by shunting an attached piezoelectric transducer with an electrical impedance. Current impedance designs result in a coupled electrical resonance at the target modal frequencies. In practical situations, variation in structural load or environmental conditions can result in significant changes in the structural resonance frequencies. This variation can severely reduce shunt damping performance as

Andrew J. Fleming; S. O. Reza Moheimani

2002-01-01

15

Adaptive piezoelectric shunt damping  

Microsoft Academic Search

Piezoelectric shunt damping systems reduce structural vibration by shunting an attached piezoelectric transducer with an electrical impedance. Current impedance designs result in a coupled electrical resonance at the target modal frequencies. In practical situations, variation in structural load or environmental conditions can result in significant changes in the structural resonance frequencies. This variation can severely reduce shunt damping performance as

A. J. Fleming; S. O. R. Moheimani

2003-01-01

16

Electromagnetic shunt damping  

Microsoft Academic Search

A method for electromagnetic shunt damping (EMSD) is presented in this paper. Compared to piezoelectric shunt damping, the proposed EMSD vibration controller has a number of benefits. It requires small shunt voltages, can provide large stroke and can dampen larger mechanical structures. A passive control strategy is validated through experimentation on a simple electromagnetic mass-spring-damper system. Theoretical results are also

S. Behrens; A. J. Fleming; S. O. Reza Moheimani

2003-01-01

17

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

Microsoft Academic Search

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

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

2002-01-01

18

Cerebrospinal Fluid Shunts  

PubMed Central

Cerebrospinal fluid (CSF) shunt technology has undergone rapid advances in the past two decades. As a result, pediatricians and other primary care physicians are being asked with increasing frequency to provide care for persons with CSF shunts. Familiarity with the more common shunts is a prerequisite to intelligent management of shunt related problems. Physicians providing daily care must have carefully documented hospital records and operative notes available to them as well as information detailing the safe evaluation of shunt patency and function if they are to manage patients with CSF shunts properly. In addition, parents and guardians must be alerted to signs and symptoms related to shunt malfunction. ImagesFigure 1.Figure 2.Figure 3.Figure 4.Figure 7.Figure 8.

Sells, Clifford J.; Shurtleff, David B.

1977-01-01

19

Adaptive electromagnetic shunt damping  

Microsoft Academic Search

This paper presents a new type of passive vibration control: adaptive electromagnetic shunt damping. We propose a single-mode resonant shunt controller that adapts to environmental conditions using two different adaptation strategies. The first technique is based on minimizing the root mean square (RMS) vibration, while the second minimizes the phase difference between two measurable signals. An experimental comparison shows that

Dominik Niederberger; Sam Behrens; Andrew J. Fleming; S. O. R. Moheimani; Manfred Morari

2006-01-01

20

Infections in cerebrospinal fluid shunts  

Microsoft Academic Search

Bacterial colonization of cerebrospinal fluid shunts is a cause of significant morbidity, causing not only shunt malfunction\\u000a and chronic ill-health but has also been implicated in an immune-complex glomerulonephritis. Almost all shunt colonizations\\u000a involve Staphylococcus albus which gains access to the shunt during surgery and grows in microcolonies inside the shunt. The\\u000a most reliable means of diagnosis at present is

Prashant Upadhyaya

1985-01-01

21

Evaluation of Shunt Malfunction Using Shunt Site Reservoir  

Microsoft Academic Search

Objective: To determine the usefulness of a separate reservoir placed at the site of the shunt in evaluation of shunt malfunction. Methods and Materials: A ventricular catheter was placed alongside the proximal catheter of the shunt and connected to a subgaleal reservoir in 17 patients, in 9 a double-lumen catheter with integrated reservoir and in 13 patients a dual catheter

S. Sood; A. I. Canady; Steven D. Ham

2000-01-01

22

Alternatives to shunting.  

PubMed

The growing awareness of mechanical and infectious complications related to the implantation of extracranial CSF shunts and the rapid developments in neuroendoscopic surgery have given pediatric neurosurgeons the possibility of choosing between the two types of treatment. The decision will depend on a number of factors, such as whether it is possible to identify the etiology of the hydrocephalus on the preoperative examinations, the surgeon's familiarity with the endoscopic technique, and his or her personal opinions about the efficacy of the alternative techniques to shunt implantation. The history and the state of the art of the alternatives to shunting are briefly reviewed for each of the main pathophysiological groups of pediatric hydrocephalus: aqueductal stenosis, posterior fossa tumors, meningomyelocele, Dandy-Walker malformation, posthemorrhagic hydrocephalus and others. PMID:10603013

Cinalli, G

1999-11-01

23

LP 2003 - 2004 Summer Student Poster Day  

Cancer.gov

D  CCR Home   About CCR   CCR Intranet        Laboratory of Pathology LP Home Clinical Services Basic Sciences Training LP Staff Accessibility of Web Site LP 2003 - 2004 Summer Student Poster Day Click on an image to enlarge Back to Summer Student

24

LP-80 IMU program status  

NASA Astrophysics Data System (ADS)

Development history, system design features, performance, and hardware status are reviewed for the fourth-generation LP-80 strapdown inertial measurement unit (IMU) which is currently in full-scale development to meet the design objectives required for missiles, torpedoes, drones, and range instrumentation system applications. The LP-80 is fully self-contained and operates at all attitudes, providing digital processed outputs of angular rate and linear acceleration measured in the body axis frame. For range applications, the LP-80 is designed to provide linear velocities with respect to a space stabilized coordinate frame.

Jackson, Edward N.

25

Mevalonate shunt pathway revisited  

SciTech Connect

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.

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

1987-05-01

26

Subdivision Schemes in Lp Spaces  

Microsoft Academic Search

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

Rong-Qing Jia

1995-01-01

27

Shunt Nephritis: Histological Dynamics following Removal of the Shunt  

Microsoft Academic Search

Diffuse crescentic glomerulonephritis was observed in a 40-year-old male patient who had a ventriculoatrial shunt implanted after a traffic accident 10 years previously. Immediately after treatment with immunosuppressants and plasma pheresis, signs of meningitis and septicemia developed. The responsible organism isolated was Staphylococcus albus. After the shunt was removed, clinical signs and renal function improved, associated with normalization of hypocomplementemia

Yasuhisa Wakabayashi; Yutaka Kobayashi; Hidekazu Shigematsu

1985-01-01

28

Ventricular Anatomy and Shunt Catheters  

Microsoft Academic Search

A functioning shunt must have a patent proximal catheter within the cerebrospinal fluid space. Occlusion with choroid plexus or ependymal tissue might be expected if these tissues are in contact with the proximal inlets. This study was undertaken to define the intraventricular distances available for a standard-placement shunt cather and to compare the available distances with actual ventricular catheter inlets.

Bruce A. Kaufman; T. S. Park

1999-01-01

29

Robust Passive Piezoelectric Shunt Dampener  

Microsoft Academic Search

This paper introduces a new multiple mode passive piezoelectric shunt damping technique. The robust pas- sive piezoelectric shunt controller is capable of damping multiple structural modes and maybe less susceptible to variations in environmental conditions that can severely eect the performance of other controllers. The proposed control scheme is validated experimentally on a piezoelectric laminated plate structure.

S. Behrens; A. J. Fleming; S. O. R. Moheimani

30

Robust passive piezoelectric shunt dampener  

Microsoft Academic Search

This paper introduces a new multiple mode passive piezoelectric shunt damping technique. The robust passive piezoelectric shunt controller is capable of damping multiple structural modes and maybe less susceptible to variations in environmental conditions that can severely effect the performance of other controllers. The proposed control scheme is validated experimentally on a piezoelectric laminated plate structure.

Sam Behrens; Andrew J. Fleming; S. O. R. Moheimani

2003-01-01

31

Controlled switching of shunt capacitors  

Microsoft Academic Search

During field measurements on shunt capacitor banks several characteristics were investigated. For these measurements Eskom utilised its mobile transient measuring facility which is equipped with a 12 bit, Nicolet 500 system, a fibre optic system for measurement signal transmission and resistive\\/capacitive voltage dividers. For inrush current limitation during shunt capacitor bank energising a series damping network or a pre-insertion impedance

M. H. B. de Grijp; R. A. Hopkins

1996-01-01

32

Outcome in shunted hydrocephalic children  

Microsoft Academic Search

The purpose of the present study was to identify the main risk factors for poor outcome in children with shunted hydrocephalus, including the timing of the operation. The medical records of patients born between 1984 and 1992, who had undergone shunt operation for hydrocephalus before 1994, were analysed retrospectively. The following data were collected: aetiology of hydrocephalus, other pathology in

INA HEINSBERGEN; JAN ROTTEVEEL; NEL ROELEVELD; ANDREE GROTENHUIS

2002-01-01

33

Hydrodynamic properties of hydrocephalus shunts: United Kingdom Shunt Evaluation Laboratory.  

PubMed Central

BACKGROUND: Although about 80% of properly diagnosed patients with hydrocephalus improve after implantation of any model of shunt, the remaining 20% may develop further complications because of inadequate shunt performance. Therefore, hydrocephalus shunts require careful independent laboratory evaluation. METHOD: Computer supported shunt testing, based on the new International Standard Organisation directives, characterises various aspects of pressure-flow performance of shunts such as variability with time, susceptibility to reflux, siphoning, temperature related behaviour, external pressure, the influence of a strong magnetic field (for example, MRI), presence of pulsation in differential pressure, particles in drained fluid, etc. RESULTS: Seven different models of valves, representing most common constructions, have been tested so far. Most contemporary valves have a hydrodynamic resistance which is too low. This may result in overdrainage both related to posture and during nocturnal cerebral vasogenic waves. A long distal catheter increases the resistance of these valves by 100%-200%. Most shunts are very sensitive to the presence of air bubbles and small particles in drained fluid. Few shunt models offer reasonable resistance to negative outlet pressure, preventing complications related to overdrainage. Valves with an antisiphon device may be blocked by raised subcutaneous pressure. All programmable valves are susceptible to overdrainage in an upright position. CONCLUSION: The behaviour of a valve during such testing is of immediate relevance to the surgeon and may not be adequately described in the manufacturer's product information. Images

Czosnyka, M; Czosnyka, Z; Whitehouse, H; Pickard, J D

1997-01-01

34

An Autonomous Piezoelectric Shunt Damping System  

Microsoft Academic Search

Passive shunt damping involves the connection of an electrical shunt network to a structurally attached piezoelec- tric transducer. In recent years, a large body of research has focused on the design and implementation of shunt circuits capable of significantly reducing structural vibration. This paper introduces an efficient, light weight, and small-in-size technique for implementing piezoelectric shunt damping circuits. A MOSFET

Andrew J. Fleming; Sam Behrens; S. O. Reza Moheimani

35

An autonomous piezoelectric shunt damping system  

Microsoft Academic Search

Passive shunt damping involves the connection of an electrical shunt network to a structurally attached piezoelectric transducer. In recent years, a large body of research has focused on the design and implementation of shunt circuits capable of significantly reducing structural vibration. This paper introduces an efficient, light weight, and small-in-size technique for implementing piezoelectric shunt damping circuits. A MOSFET half

Andrew J. Fleming; Sam Behrens; S. O. R. Moheimani

2003-01-01

36

Analytic approximation of matrix functions in Lp  

Microsoft Academic Search

We consider the problem of approximation of matrix functions of class Lp on the unit circle by matrix functions ana- lytic in the unit disk in the norm of Lp, 2 p < 1. For an m n matrix function in Lp, we consider the Hankel operator H : Hq(Cn) ! H2 (C m), 1=p + 1=q = 1=2. It

Laurent Baratchart; F. L. Nazarov; V. V. Peller

2009-01-01

37

Outcome analysis of shunt surgery in hydrocephalus  

PubMed Central

Aim: To study the clinical outcome of shunt surgeries in children suffering from hydrocephalus. Methods: A prospective study of 50 children with hydrocephalus who underwent a ventriculo-peritoneal shunt insertion over a period of two years. These patients were then followed up for shunt related complications, shunt revisions and outcome. Results: Twenty six of the 50 patients (52%) suffered from complications. The most common complications were shunt blockage (n=7) and shunt infection (n=6). These complications necessitated repeated shunt revisions. Conclusions: Infective complications of hydrocephalus are more likely to leave behind an adverse neurological outcome in the form of delayed milestones and mental retardation.

Ahmed, Ashraf; Sandlas, Gursev; Kothari, Paras; Sarda, Dinesh; Gupta, Abhaya; Karkera, Parag; Joshi, Prashant

2009-01-01

38

Quadrupole shunt experiments at SPEAR  

SciTech Connect

As part of a program to align and stabilize the SPEAR storage ring, a switchable shunt resistor was installed on each quadrupole to bypass a small percentage of the magnet current. The impact of a quadrupole shunt is to move the electron beam orbit in proportion to the off-axis beam position at the quadrupole, and to shift the betatron tune. Initially, quadrupole shunts in SPEAR were used to position the electron beam in the center of the quadrupoles. This provided readback offsets for nearby beam position monitors, and helped to steer the photon beams with low-amplitude corrector currents. The shunt-induced tune shift measurements were then processed in MAD to derive a lattice model.

Corbett, W.J.; Hettel, R.O.; Nuhn, H.-D.

1996-05-01

39

A Guide to LP, the Larch Prover  

Microsoft Academic Search

This guide provides an introduction to LP (the Larch Prover), Release 2.2. It describes how LP can beused to axiomatize theories in a subset of multisorted first-order logic and to provide assistance in provingtheorems. It also contains a tutorial overview of the equational term-rewriting technology that provides, alongwith induction rules and other user-supplied nonequational rules of inference, part of LP's

Stephen J. Garland; John V. Guttag

1991-01-01

40

Bizarre complications of peritoneovenous shunts.  

PubMed Central

Implantable peritoneovenous shunts have facilitated the management of patients with medically intractable ascites. The more commonly reported complications occur with an incidence of 20-50%. Rare and problematic complications are becoming increasingly frequent. Two unusual complications, 1) progressive respiratory insufficiency and death secondary to pulmonary embolization of ascites fluid containing cholesterol crystals, and 2) shunt malfunction caused by the formation of a fibrous envelope around the venous catheter are presented. Pathogenesis, diagnosis and therapy of each of these unusual complications is discussed. Images Fig. 1a. Fig. 1b. Fig. 2a.

Eckhauser, F E; Strodel, W E; Girardy, J W; Turcotte, J G

1981-01-01

41

Broadband piezoelectric shunts for passive structural vibration control  

Microsoft Academic Search

This paper reports an advanced passive piezoelectric shunt damping technique called broadband piezoelectric shunting. The shunt circuit for the broadband shunting is built with a reactance neutralizing circuit, which is designed with operational amplifier circuits to maximize the parallel reactance of the shunt circuit over a wide frequency band. It is different from the earlier shunt circuits, either used for

Shu-yau Wu

2001-01-01

42

Paradoxical embolism, migraine, and cardiac shunt closure  

Microsoft Academic Search

A cardiac right-to-left shunt through a patent foramen ovale (PFO) or an atrial septal defect (ASD) allows paradoxical embolism and seems to be associated with cryptogenic stroke and migraine. The transcatheter closure of inter-atrial shunts with an “umbrella” device is nowadays widely practised in the treatment of patients with symptomatic shunts. Shunt closure has also been associated with a decrease

J. G. L. M. Luermans

2010-01-01

43

Modeling of AC\\/DC current shunts  

Microsoft Academic Search

This paper describes mathematical modeling of squirrel cage design AC current shunts. These shunts are designed to have a flat frequency response up to 100 kHz. Model was made using lumped element modeling and then analytical transfer function and input impedance of the shunt were derived from the model. Then these functions have been used in excel where frequency response

B. Pinter; M. Lindic?; B. Voljc?; Z. Svetik; R. Lapuh

2010-01-01

44

Cerebrospinal Fluid Shunt Infections in Children  

Microsoft Academic Search

Infections of cerebrospinal fluid shunts continue to be a substantial source of mortality and morbidity in children with hydrocephalus. Although several therapeutic modalities are currently used for the treatment of shunt infections, there are no clear guidelines for treatment. The purpose of this study was to determine the common pathogens of cerebrospinal fluid shunt infections and evaluate the success of

M. Turgut; D. Alabaz; F. Erbey; E. Kocabas; T. Erman; E. Alhan; N. Aksaray

2005-01-01

45

Passive vibration control via electromagnetic shunt damping  

Microsoft Academic Search

This work will present a new type of passive vibration control technique based on the concept of electromagnetic shunt damping. The proposed technique is similar to piezoelectric shunt damping, as an appropriately designed impedance is shunted across the terminals of the transducer. Theoretical and experimental results are presented for a simple electromagnetic mass spring damper system.

Sam Behrens; Andrew J. Fleming; S. O. Reza Moheimani

2005-01-01

46

Parameter identification method for piezoelectric shunt damping  

Microsoft Academic Search

Piezoelectric shunt damping is a method to reduce structural vibration by shunting a piezoelectric element with an electrical circuit. This paper proposes a method to identify the physical parameters that are required to design piezoelectric shunt damping systems. Employing self-sensing actuator methodology, the proposed method requires no additional sensor or actuator other than a simple bridge circuit. The parameters can

Kentaro Takagi; Kenji Nagase; Kazuhiko Oshima; Yoshikazu Hayakawa; Zhi-Wei Luo

2004-01-01

47

Cystoventricular Shunting of Intracranial Arachnoid Cysts  

Microsoft Academic Search

Ten patients with intracranial arachnoid cysts were treated with direct shunting of the cyst to a lateral ventricle. The strategic goal of cystoventricular shunting is to establish physiologically normal intracranial pressure relationships, rather than cyst obliteration. Cystoventricular shunts were successful in treating single and multiple intracranial cysts in supratentorial and infratentorial locations and in patients with normal and enlarged lateral

Lori A. McBride; Ken R. Winston; Jane E. Freeman

2003-01-01

48

Interactions of Liquid Propellant/LP XM46 With Soils.  

National Technical Information Service (NTIS)

Development of an effective spill response plan for liquid propellant/LP XM46 (LP) required an understanding of the potential interactions between soil and the propellant. Studies were designed to characterize potential hazards of initial contact of LP wi...

J. C. Pennington C. B. Price D. Gunnison D. W. Rathburn T. E. Myers

1994-01-01

49

75 FR 39680 - Houston Pipe Line Company LP, Worsham-Steed Gas Storage, L.P., Energy Transfer Fuel, LP, Mid...  

Federal Register 2010, 2011, 2012, 2013

...PR10-50-000] Houston Pipe Line Company LP, Worsham-Steed Gas Storage, L.P., Energy Transfer Fuel, LP, Mid Continent Market Center, L.L.C., Oasis Pipeline, LP (Not Consolidated); Notice of Baseline Filings July 2, 2010. Take...

2010-07-12

50

Shunt regulation electric power system  

NASA Technical Reports Server (NTRS)

A regulated electric power system having load and return bus lines is described. A plurality of solar cells interconnected in a power supplying relationship and having a power shunt tap point electrically spaced from the bus lines is provided. A power dissipator is connected to the shunt tap point and provides for a controllable dissipation of excess energy supplied by the solar cells. A dissipation driver is coupled to the power dissipator and controls its conductance and dissipation and is also connected to the solar cells in a power taping relationship to derive operating power therefrom. An error signal generator is coupled to the load bus and to a reference signal generator to provide an error output signal which is representative of the difference between the electric parameters existing at the load bus and the reference signal generator. An error amplifier is coupled to the error signal generator and the dissipation driver to provide the driver with controlling signals.

Wright, W. H.; Bless, J. J. (inventors)

1971-01-01

51

Arterioportal shunts on dynamic computed tomography  

SciTech Connect

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.

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

1983-05-01

52

Unusual complications of ventriculo peritoneal shunt surgery  

PubMed Central

Ventriculo peritoneal (VP) shunt surgery is one of the common neurosurgical procedures employed in the management of hydrocephalus. Numerous complications related to this procedure are reported in the literature. Peritoneal catheter-related complications are the usual causes of the shunt malfunction. We report three unusual cases of peritoneal shunt catheter migration in children. Two cases are of anal and one vaginal extrusion. Possible mechanisms of migration and management strategies were discussed.

Teegala, Ramesh; Kota, Laxmi Prasanna

2012-01-01

53

Complications of Fourth-Ventricular Shunts  

Microsoft Academic Search

Fourth-ventricular shunting is commonly used to treat symptomatic posterior fossa cysts of the Dandy-Walker malformation and trapped fourth ventricle. Although the benefits of this procedure have been widely reported, there is a paucity of data on the pitfalls of posterior fossa shunting in the neurosurgical literature. During the 4-year period from July 1989 to June 1993, we placed fourth-ventricular shunts

Mark Lee; Diana Leahu; Howard L. Weiner; Rick Abbott; Jeffrey H. Wisoff; Fred J. Epstein

1995-01-01

54

Asymptomatic Bowel Perforation by Abandoned Ventriculoperitoneal Shunt  

PubMed Central

We report a case of an abandoned abdominal ventriculoperitoneal shunt that migrated into the gastric antrum, colonic hepatic flexure, and liver parenchyma, which was discovered incidentally on an abdominal CT obtained for renal stones. In regards to the migrated abandoned VP shunt, the patient was asymptomatic. Upon review of prior CT scans, these findings had progressed over approximately 7 years. We describe the case and discuss the clinical and radiologic findings, complications resulting from ventriculoperitoneal shunts, and possible approaches to their management.

Rinker, Eric K; Osborn, Daniel A.; Williams, Todd R.; Spizarny, David L.

2013-01-01

55

Therapy of Hyper-Lp(a)  

Microsoft Academic Search

Lipoprotein (a) [Lp(a)] appears to be one of the most atherogenic lipoproteins. It consists of a low-density lipoprotein (LDL) core in addition to a covalently bound glycoprotein, apolipoprotein (a) [apo(a)]. Apo(a) exists in numerous polymorphic forms. The size polymorphism is mediated by the variable number of kringle-4 Type-II repeats found in apo(a). Plasma Lp(a) levels are determined to more than

K. M. Kostner; G. M. Kostner

56

Radiological Insertion and Management of Peritoneovenous Shunt  

SciTech Connect

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.

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

57

Distal Splenorenal Shunt Versus Transjugular Intrahepatic Portal Systematic Shunt for Variceal Bleeding: A Randomized Trial  

Microsoft Academic Search

Background & Aims: Variceal bleeding refractory to medical treatment with -blockers and endoscopic ther- apy can be managed by variceal decompression with either surgical shunts or transjugular intrahepatic portal systemic shunts (TIPS). This prospective randomized trial tested the hypothesis that patients receiving distal splenorenal shunts (DSRS) would have significantly lower rebleeding and encephalopathy rates than TIPS in management of refractory

J. MICHAEL HENDERSON; THOMAS D. BOYER; MICHAEL H. KUTNER; JOHN R. GALLOWAY; LAYTON F. RIKKERS; LENNOX J. JEFFERS; KAREEM ABU-ELMAGD; JASON CONNOR

2006-01-01

58

Nonlinear piezoelectric shunting for structural damping  

Microsoft Academic Search

The electromechanical coupling behavior of piezoelectric materials allows their use as damping elements in dynamic structural systems. By shunting the electrical terminals of piezoelectric element bonded to a structure, electrical components can be used to change the apparent dynamic response of the structure. Linear shunting components such as resistive elements or inductive-resistive-capacitive circuits, respectively, have been used to produce behavior

David J. Warkentin; Nesbitt W. Hagood

1997-01-01

59

Multifocal dural arteriovenous shunts in children  

Microsoft Academic Search

The authors present four consecutive cases of multiple dural arteriovenous (AV) shunts in children. This entiry represents a rare but severe clinical situation. the edology of the shunts is not known. There is clinical and radiological evidence that they are evolutionary lesions. The clinical presentation in this series was usually by cardiac manifestations (one case), cerebrospinal fluid disorders (two cases),

Ricardo Garcia-Monaco; Georges Rodesch; Karel Terbrugge; Patricia Burrows; Pierre Lasjaunias

1991-01-01

60

Non-shaved ventriculoperitoneal shunt in Thailand.  

PubMed

The objective of this study was to determine whether non-shaved patients undergoing ventriculoperitoneal shunt operations would experience a significantly increased shunt infection rate as compared to shaved patients. Clinical trials of non-shaved scalp preparation were performed in ventriculoperitoneal shunt procedures at Songklanagarind Hospital from January 1994 to December 1999. Exclusion criteria were poor scalp condition, previous shunt procedures and immunocompromised hosts. Statistical analysis using univariate, multivariate and logistic regression was used. One hundred and nineteen patients were included in the study. Thirty-six cases were in the non-shaved group. Thirty-eight of 119 cases were less than one year of age and congenital hydrocephalus was the most common problem. The only notable risk factor for shunt infection was an operation lasting more than 59 min. The shunt infection rate in the non-shaved and shaved groups was 6.25% and 14.94%, respectively (p>0.05). In conclusion, leaving the hair intact for ventriculoperitoneal shunt surgery is safe and not associated with increased risk of shunt infection. The non-shaved method may encourage quicker restoration of the patients' self-image and facilitate their early return to normal life. PMID:15749415

Ratanalert, Sanguansin; Musikawat, Paphan; Oearsakul, Thakul; Saeheng, Sakchai; Chowchuvech, Vorapong

2005-02-01

61

Performance of piezoelectric shunts for vibration reduction  

NASA Astrophysics Data System (ADS)

This work addresses passive reduction of structural vibration by means of shunted piezoelectric patches. The two classical resistive and resonant shunt solutions are considered. The main goal of this paper is to give closed-form solutions to systematically estimate the damping performances of the shunts, in the two cases of free and forced vibrations, whatever the elastic host structure is. Then it is carefully demonstrated that the performance of the shunt, in terms of vibration reduction, depends on only one free parameter: the so-called modal electromechanical coupling factor (MEMCF) of the mechanical vibration mode to which the shunts are tuned. Experiments are proposed and an excellent agreement with the model is obtained, thus validating it.

Thomas, O.; Ducarne, J.; Deü, J.-F.

2012-01-01

62

[Delayed intracerebral hemorrhage following VP shunt operation].  

PubMed

Three cases of communicating hydrocephalus after subarachnoid hemorrhage are reported that underwent ventriculoperitoneal shunt and suffered from delayed intracerebral hemorrhage along the ventricular catheter. Ventricular catheters were inserted into the posterior horn with minimal brain damage by our method, in case 1 and 2, 3 times try of ventriculostomy, in case 3, replacement along the same route on the shunt revision. Blood pressure control after the operation was good and bleeding tendency was not observed. Vascular anomaly was not found in preoperative angiography in any case. In case 1, 60 year-old man, intracerebral hemorrhage occurred on the 7th-9th postoperative day as the result of respiratory acidosis and generalized convulsion which needed assisted ventilation for two days. In case 2, 54 year-old man and case 3, 59 year-old woman, headache and hemiparesis suddenly developed immediately after micturition 4 days after operation. Postoperative CT scan revealed that cranioplasty, performed at the same time as shunt operation, caused mass effect on the shunted side of the brain in case 2. In case 3, VP shunt system revised did not seem to function so well. These conditions might predispose the shunted brain to bleed, in addition to the increased intracranial pressure or blood pressure probably produced by Valsalva effect at micturition. These cases indicate that the small surgical wound in the brain induced by shunt procedure could cause progressive degenerative vascular change and bring about delayed intracranial hemorrhage under some predisposing factors. PMID:3399007

Kubokura, T; Nishimura, T; Koyama, S; Sanno, N; Tsubone, K

1988-01-01

63

MAXIMAL FUNCTION ON GENERALIZED LEBESGUE SPACES Lp(·)  

Microsoft Academic Search

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(·)(?).

L. DIENING

64

Lp-based combinatorial problem solving  

Microsoft Academic Search

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

K. Hoffman; M. Padberg

1985-01-01

65

76 FR 63915 - DCP Midstream, LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. CP11-549-000] DCP Midstream, LP; Notice of Application Take notice that on September 23, 2011, DCP Midstream, LP (DCP), filed an application pursuant to Section...

2011-10-14

66

78 FR 43190 - DCP Midstream, LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...ENERGY Federal Energy Regulatory Commission [Docket No. CP13-509-000] DCP Midstream, LP; Notice of Application Take notice that on July 1, 2013, DCP Midstream, LP (DCP), filed an application pursuant to Section 7(c) of the Natural...

2013-07-19

67

Infection of a shunt by Mycobacterium fortuitum: case report.  

PubMed

Mycobacterium fortuitum is a rare cause of central nervous system infection; however, shunt infection caused by this organism has not been reported. We report a case of shunt infection subsequent to insertion of a ventriculoatrial shunt for obstructive hydrocephalus caused by a cerebellar hematoma. The shunt infection was controlled by removal of the shunt and a combination of systemic and intraventricular administration of amikacin, and oral administration of ofloxacin. The case is discussed and the pertinent literature reviewed. PMID:1922723

Chan, K H; Mann, K S; Seto, W H

1991-09-01

68

49 CFR 236.56 - Shunting sensitivity.  

Code of Federal Regulations, 2013 CFR

...in its most restrictive state if, when track circuit is dry, a shunt of 0.06 ohm resistance is connected across the track rails of the circuit, including fouling sections of turnouts. [49 FR 3383, Jan. 26,...

2013-10-01

69

Bilateral pneumothorax during subdural-peritoneal shunting.  

PubMed

Pneumothorax is a very rare complication of ventriculoperitoneal shunting in children. We report a case of an iatrogenic bilateral tension pneumothorax during the placement of a subdural-peritoneal shunting. After the placement of peritoneal catheter, oxygen saturation of the patient quickly decreased, hypotension and bradycardia occurred. Intraoperative x-rays showed the pneumothorax. A thoracostomy tube was inserted and attached to an underwater seal. Vital signs improved in a short time period. The radiological improvement had been achieved in four days. Early diagnosis and prompt intervention are life-saving for this complication. To avoid this complication, the tip of the shunt tunneler should be always palpable during the placement of the peritoneal catheter, especially in children's shunt surgery. PMID:21845583

Solmaz, Ilker; Tehli, Ozkan; Kaya, Serdar; Erdogan, Ersin; Izci, Yusuf

2011-01-01

70

The somatic shunt cable model for neurons.  

PubMed Central

The derivation of the equations for an electrical model of nerve cells is presented. The model consists of an equivalent cylinder, a lumped somatic impedance, and a variable shunt at the soma. This shunt was introduced to take into account the fast voltage decays observed following the injections of current pulses in some motoneurons and hippocampal granule cells that could not be explained by existing models. The shunt can be interpreted either by penetration damage with the electrode or by a lower membrane specific resistance at the soma than in the dendrites. A solution of the model equations is presented that allows the estimation of the electrotonic length L, the membrane time constant tau m, the dendritic dominance ratio rho, and the shunt parameter epsilon, based only on the measurement of the first two coefficients and time constants in the multiexponential voltage response to injected current pulses.

Durand, D

1984-01-01

71

Complications after shunting isolated IV ventricles  

Microsoft Academic Search

An isolated IV ventricle in chronically shunted patients is being reported with increasing frequency. Complications associated\\u000a with posterior fossa shunting, however, have seldom been described. Between January 1986 and December 1995, we treated 292\\u000a children younger than 16 years for hydrocephalus: 7 (2.4%) developed an isolated IV ventricle, and 5 of these were symptomatic\\u000a with posterior fossa signs. These 5

Hans G. Eder; Klaus A. Leber; Wilfried Gruber

1997-01-01

72

Infections of Scribner and Brescia Arteriovenous Shunts  

PubMed Central

The incidence of infections of Scribner shunts and Brescia fistulae in patients receiving intermittent haemodialysis was compared. In both groups infection was most commonly due to Staphylococcus aureus and was associated especially with carriage of this organism on the skin of the limb where the shunt or fistula was sited. The incidence of local infection was much less with the Brescia fistula but this was accompanied by a relatively higher incidence of septicaemia.

Ralston, A. J.; Harlow, G. R.; Jones, D. M.; Davis, P.

1971-01-01

73

Comparison of shunt infection incidence in high-risk subgroups receiving antibiotic-impregnated versus standard shunts  

Microsoft Academic Search

Background  Shunt infection is a morbid complication of CSF shunting. Though antibiotic-impregnated shunt (AIS) systems decrease shunt\\u000a infections by preventing bacterial colonization following device implantation, their effectiveness in populations at high\\u000a risk for infection has recently been disputed. We set out to determine whether the categorical switch to AIS systems at our\\u000a institution has resulted in a decreased incidence of shunt

Scott L. Parker; Frank J. Attenello; Daniel M. Sciubba; Giannina L. Garces-Ambrossi; Edward Ahn; Jon Weingart; Benjamin Carson; George I. Jallo

2009-01-01

74

Endoscopic third ventriculostomy in previously shunted children.  

PubMed

Endoscopic third ventriculostomy (ETV) is a routine and safe procedure for therapy of obstructive hydrocephalus. The aim of our study is to evaluate ETV success rate in therapy of obstructive hydrocephalus in pediatric patients formerly treated by ventriculoperitoneal (V-P) shunt implantation. From 2001 till 2011, ETV was performed in 42 patients with former V-P drainage implantation. In all patients, the obstruction in aqueduct or outflow parts of the fourth ventricle was proved by MRI. During the surgery, V-P shunt was clipped and ETV was performed. In case of favourable clinical state and MRI functional stoma, the V-P shunt has been removed 3 months after ETV. These patients with V-P shunt possible removing were evaluated as successful. In our group of 42 patients we were successful in 29 patients (69%). There were two serious complications (4.7%)-one patient died 2.5 years and one patient died 1 year after surgery in consequence of delayed ETV failure. ETV is the method of choice in obstructive hydrocephalus even in patients with former V-P shunt implantation. In case of acute or scheduled V-P shunt surgical revision, MRI is feasible, and if ventricular system obstruction is diagnosed, the hydrocephalus may be solved endoscopically. PMID:23984061

Brichtova, Eva; Chlachula, Martin; Hrbac, Tomas; Lipina, Radim

2013-01-01

75

Endoscopic Third Ventriculostomy in Previously Shunted Children  

PubMed Central

Endoscopic third ventriculostomy (ETV) is a routine and safe procedure for therapy of obstructive hydrocephalus. The aim of our study is to evaluate ETV success rate in therapy of obstructive hydrocephalus in pediatric patients formerly treated by ventriculoperitoneal (V-P) shunt implantation. From 2001 till 2011, ETV was performed in 42 patients with former V-P drainage implantation. In all patients, the obstruction in aqueduct or outflow parts of the fourth ventricle was proved by MRI. During the surgery, V-P shunt was clipped and ETV was performed. In case of favourable clinical state and MRI functional stoma, the V-P shunt has been removed 3 months after ETV. These patients with V-P shunt possible removing were evaluated as successful. In our group of 42 patients we were successful in 29 patients (69%). There were two serious complications (4.7%)—one patient died 2.5 years and one patient died 1 year after surgery in consequence of delayed ETV failure. ETV is the method of choice in obstructive hydrocephalus even in patients with former V-P shunt implantation. In case of acute or scheduled V-P shunt surgical revision, MRI is feasible, and if ventricular system obstruction is diagnosed, the hydrocephalus may be solved endoscopically.

Chlachula, Martin; Hrbac, Tomas; Lipina, Radim

2013-01-01

76

Performance of self-excited single-phase induction generators with shunt, short-shunt and long-shunt excitation connections  

Microsoft Academic Search

The influence of three capacitor excitation topologies (shunt, short-shunt and long-shunt) on the steady-state and dynamic performance of a single-phase, self-excited induction generator is explored in this paper. Attention is focused on the influence of the different capacitor connections on the generator overloaded and output power capabilities. The generator voltage with shunt excitation connection collapses when overloaded, while with either

O. Ojo

1996-01-01

77

Performance of self-excited single-phase induction generators with shunt, short-shunt and long-shunt excitation connections  

SciTech Connect

The influence of three capacitor excitation topologies (shunt, short-shunt and long-shunt) on the steady-state and dynamic performance of a single-phase, self-excited induction generator is explored in this paper. Attention is focused on the influence of the different capacitor connections on the generator overload and output power capabilities. The generator voltage with shunt excitation connection collapses when overloaded while with either the long or short-shunt excitation connection the generator is able to sustain the load at a lower operating voltage and larger load current.

Ojo, O. [Tennessee Technological Univ., Cookeville, TN (United States). Dept. of Electrical Engineering] [Tennessee Technological Univ., Cookeville, TN (United States). Dept. of Electrical Engineering

1996-09-01

78

Clinical Evaluation of Microporous Tissue Interface Dialysis Shunts and Catheters.  

National Technical Information Service (NTIS)

The purpose of the study was to evaluate new types of hemodialysis shunts and peritoneal dialysis catheters whose outer surfaces are coated with a microporous tissue interface (MTI) to obtain tissue fixation and reduce shunt infections. These new cannulas...

T. C. Robinson

1976-01-01

79

Laser isolation of shunted regions in industrial solar cells  

Microsoft Academic Search

This paper provides proof of concept for atechnique thatuses laser-ablated grooves to locally isolate shunted regions in industrial silicon solar cells. The shunted regions are located using photoluminescence imaging and then isolated from the active cell area with a Nd:YAG laser. By applying this shunt isolation technique, we demonstrate that a strongly shunted 9? 6% efficient industrial screen-printed solar cell

M. D. Abbott; T. Trupke; H. P. Hartmann; R. Gupta; O. Breitenstein

2007-01-01

80

Compact vs. Exponential-Size LP Relaxations  

SciTech Connect

In this paper we introduce by means of examples a new technique for formulating compact (i.e. polynomial-size) LP relaxations in place of exponential-size models requiring separation algorithms. In the same vein as a celebrated theorem by Groetschel, Lovasz and Schrijver, we state the equivalence of compact separation and compact optimization. Among the examples used to illustrate our technique, we introduce a new formulation for the Traveling Salesman Problem, whose relaxation we show equivalent to the subtour elimination relaxation.

Carr, R.D.; Lancia, G.

2000-09-01

81

Percutaneous Placement of Ventriculoatrial Shunts in the Pediatric Population  

Microsoft Academic Search

The percutaneous placement of ventriculoatrial (VA) shunts has been previously described, usually in adults. We report a series of 7 pediatric cases ranging from 6 to 17 years. Five patients were female and 2 were male. All patients had prior ventriculoperitoneal (VP) shunts for hydrocephalus, of which 1 had been subsequently converted to a ventriculopleural shunt. Indications for conversion to

Gavin W. Britz; Anthony M. Avellino; Robert Schaller; John D. Loeser

1998-01-01

82

49 CFR 236.57 - Shunt and fouling wires.  

Code of Federal Regulations, 2010 CFR

...2009-10-01 2009-10-01 false Shunt and fouling wires. 236.57 Section 236.57...Track Circuits § 236.57 Shunt and fouling wires. (a) Except as provided in...b) of this section, shunt wires and fouling wires hereafter installed or...

2009-10-01

83

49 CFR 236.104 - Shunt fouling circuit.  

Code of Federal Regulations, 2010 CFR

...2009-10-01 2009-10-01 false Shunt fouling circuit. 236.104 Section 236.104 Transportation...Inspections and Tests; All Systems § 236.104 Shunt fouling circuit. Shunt fouling circuit shall be inspected and tested at least...

2009-10-01

84

49 CFR 236.57 - Shunt and fouling wires.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Shunt and fouling wires. 236.57 Section 236.57...Track Circuits § 236.57 Shunt and fouling wires. (a) Except as provided in...b) of this section, shunt wires and fouling wires hereafter installed or...

2010-10-01

85

49 CFR 236.104 - Shunt fouling circuit.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Shunt fouling circuit. 236.104 Section 236.104 Transportation...Inspections and Tests; All Systems § 236.104 Shunt fouling circuit. Shunt fouling circuit shall be inspected and tested at least...

2010-10-01

86

49 CFR 236.104 - Shunt fouling circuit.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Shunt fouling circuit. 236.104 Section 236.104 Transportation...Inspections and Tests; All Systems § 236.104 Shunt fouling circuit. Shunt fouling circuit shall be inspected and tested at least...

2013-10-01

87

Shunt attachment and method for interfacing current collection systems  

Microsoft Academic Search

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

Paul E. Denney; Natraj C. Iyer; Hannan; William F

1992-01-01

88

Vibration damping with shunted piezoceramics: Fundamentals and technical applications  

Microsoft Academic Search

This paper describes the damping performance of shunted piezoceramics for passive LR-networks, negative capacitance shunts (LRC) and the SSDI-switching technique. The calculations are based on a general description for mechanical structures with piezoelectric elements. Normalized parameters are introduced and the damping performance described by the generalized electromechanical coupling coefficient. For every electrical shunting the optimal network parameters are determined and

Marcus Neubauer; Jörg Wallaschek

89

Structural vibration damping experiments using improved piezoelectric shunts  

Microsoft Academic Search

The theoretical analysis of an improved piezoelectric shunt using a piezoelectric PZT element shunted with a parallel resistor and inductor circuit for passive structural damping and vibration control was studied. In this paper, we report results of the experiments of the improved shunting technique which were performed and demonstrated successfully for passive vibration control in the ARPA consortium SPICES program

Shu-Yau Wu; Andrew S. Bicos

1997-01-01

90

Multiple mode current flowing passive piezoelectric shunt controller  

Microsoft Academic Search

A method for multiple mode piezoelectric shunt damping will be presented in this paper. The proposed ``current flowing'' shunt controller has a number of benefits compared to previous shunt damping schemes; it is simpler to implement and requires small number of passive circuit elements. The passive control strategy is validated through experimentation on two piezoelectric laminated structures.

S. Behrens; S. O. R. Moheimani; A. J. Fleming

2003-01-01

91

Dynamics modelling of beams with shunted piezoelectric elements  

Microsoft Academic Search

General modelling of a resonant shunting damper has been made from piezoelectric sensor\\/actuator equations. It is found that an additional damping, which is augmented to a system, is generated by the shunt damping effect. The transfer function of the tuned electrical absorber is derived for both series and parallel shunt circuit. The governing equations and associated boundary conditions are derived

C. H. Park

2003-01-01

92

A new control approach for switching shunt damping  

Microsoft Academic Search

This paper presents a new control approach for piezoelectric switching shunt damping. Recently, semi-active controllers have been used to switch piezoelectric materials in order to damp vibration. These switching shunt circuits allow a small implementation and require only little power supply. However, the control laws to switch these shunts are derived heuristically and therefore it remains unclear, if a better

Dominik Niederberger; Manfred Morari; Stanislaw Pietrzko

2004-01-01

93

Vibration damping with piezoceramics shunted to negative capacitance networks  

Microsoft Academic Search

Piezoelectric shunt damping is a well known technique to damp the mechanical vibrations of structures. Due to the piezoelectric effect, the piezoceramics converts mechanical energy into electrical energy. Connecting electrical networks to the electrodes of the piezoceramics allows to dissipate a part of this energy in the electrical shunt. Linear resonant shunts consisting of inductance and resistance (LR) are broadly

Marcus Neubauer; J. Wallaschek

2009-01-01

94

Multiple mode current flowing passive piezoelectric shunt controller  

Microsoft Academic Search

A method for multiple mode piezoelectric shunt damping will be presented in this paper. The proposed “current flowing” shunt controller has a number of benefits compared to previous shunt damping schemes; it is simpler to implement and requires small number of passive circuit elements. The passive control strategy is validated through experimentation on two piezoelectric laminated structures.

S Behrens; S. O. R Moheimani; A. J Fleming

2003-01-01

95

Rescue endoscopic third ventriculostomy for repeated shunt blockage  

PubMed Central

The role of endoscopic third ventriculostomy (ETV) is getting more popular for all types of hydrocephalus. It has several advantages and is also being considered for malfunctioning of ventriculo-peritoneal shunt. A 16-year-old child had fourteen shunt revisions in his life. He was eventually treated with ETV with successful result. Repeated shunt failure can be an additional indication of ETV.

Goyal, Puneet K.; Meher, Sujit K.; Singh, Daljit; Singh, Hukum; Tandon, Monica

2011-01-01

96

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

Microsoft Academic Search

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

ALES NEKVINDA

97

Lp-PLA2: A New Kid on the Block  

Microsoft Academic Search

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

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

2006-01-01

98

Microsoft Word - LP_Fire_drill_2003.doc  

Cancer.gov

NCI/CCR/LP CLINICAL SERVICES Make-up Fire & Emergency Evacuation Drill Evaluation Name: ________________________ Lab Section: _____________________ Position: ______________________ Supervisor: ______________________ Room Location: _________________

99

Vibration control via shunted embedded piezoelectric fibers  

Microsoft Academic Search

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.

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

2004-01-01

100

New method of negative capacitance shunt tuning for vibration control  

NASA Astrophysics Data System (ADS)

The control of vibrating structures using piezoelectric elements connected to simple control circuits, known as shunts, is a widely studied field. Many different shunts have been researched that haven been shown to obtain strong performance in both narrow and broadband frequency ranges. Yet, the choice for the exact parameters of these shunts can be found different ways. In this work, a new method of selecting the components of a negative capacitance shunt is presented. An impedance model of a piezoelectric patch is developed and used to predict the control of a vibrating structure. The model predicts the magnitude of the strain induced voltage caused by the vibrating substrate through the computation of two voltage readings within the shunt. It is then confirmed experimentally, that it is possible to obtain experimentally the shunt parameters that produce maximum control through measurement of the shunt response.

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

2012-03-01

101

Late calcification and rupture: a rare complication of ventriculoperitoneal shunting.  

PubMed

A 10-year old boy who had undergone a ventriculoperitoneal (V/P) shunt because of hydrocephalus at 10 days of age was doing well until 20 days ago, when he began to experience headache and seizures. CT scan revealed dilated lateral ventricles and calcification at the shunt site. X-rays showed an unusual calcification pattern around the shunt tube and rupture of the tube between the mastoid bone and clavicle. The patient underwent surgery and the shunt was changed completely. The ventricles became small in the follow-up. Even though V/P shunts may induce fibrous tissue formation and calcification around the tube, there are a few cases of shunt rupture and calcification of shunts in the literature. Possible mechanisms of the rupture and calcification are discussed in this paper. PMID:23208915

Kural, Cahit; Kirik, Alparslan; Pusat, Serhat; Senturk, Tolga; Izci, Yusuf

2012-01-01

102

Passively Shunted Piezoelectric Damping of Centrifugally-Loaded Plates  

NASA Technical Reports Server (NTRS)

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.

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

2009-01-01

103

Proceedings of the symposium on LP-gas odorization technology  

SciTech Connect

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.

Not Available

1989-01-01

104

78 FR 45592 - DeltaPoint Capital IV, LP;  

Federal Register 2010, 2011, 2012, 2013

...is hereby given that DeltaPoint Capital IV, L.P., 45 East Avenue...13 CFR 107.730). DeltaPoint Capital IV, L.P. provided financing...financing was contemplated for working capital. The financing is brought...

2013-07-29

105

Ocean noise triggering of LP events at Deception Island volcano  

NASA Astrophysics Data System (ADS)

During the austral winter 2009, swarms of long-period (LP) events with astonishingly regular interevent times were recorded at Deception Island volcano, Antarctica. Swarm events have similar waveforms, indicating the repeated activation of a non-destructive source process. These swarms may last up to a few hours, and characteristic inter-event times range from ~10 s to ~20 s for individual swarms. The amplitudes of the periodic LPs vary significantly over a short time scale, which makes an association with a steady state internal process complicate. On the other hand, we observe that LP inter-event times are approximate integer multiples of the dominant periods of the oceanic microseism, and propose that the periodicity observed in the occurrence times of LP events is the result of dynamic triggering of the LP source process by the effect of oceanic microtremors. A positive correlation between microseism amplitude and LP periodicity supports this idea. We attribute LP periodicity to the coincidence of sustained LP activity in an unstable hydrothermal system and external forcing by ocean noise that introduces periodic pressure variations in volcano fluids. We estimate the volumetric strain change generated by the oceanic microseism at the source location and conclude that strain of order 10-7 is sufficient to introduce clear periodicity in the LP sequences.

Stich, D.; Almendros, J.; Jiménez, V.; Mancilla, F.; Carmona, E.

2012-04-01

106

Lp-vanishing results for conformally flat manifolds and submanifolds  

NASA Astrophysics Data System (ADS)

In this paper, we first obtain an Lp-vanishing result for solutions of Simons type equations under spectral assumptions on the relevant Schrödinger operators, and then get some applications to locally conformally flat Riemannian manifolds with constant nonnegative scalar curvature. Furthermore, we get some Lp-vanishing results for submanifolds.

Lin, He-Zi

2013-11-01

107

76 FR 68745 - Seneca Power Partners, L.P.  

Federal Register 2010, 2011, 2012, 2013

...Energy Regulatory Commission [Docket No. EL12-6-000] Seneca Power Partners, L.P. v. New York Independent System Operator...Commission) Rules of Practice and Procedures, 18 CFR 385.206, Seneca Power Partners, L.P. (Complainant) filed a complaint...

2011-11-07

108

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

Federal Register 2010, 2011, 2012, 2013

...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...

2013-02-01

109

77 FR 59393 - Jordan Cove Energy Project LP; Pacific Connector Gas Pipeline LP; Notice of Additional Public...  

Federal Register 2010, 2011, 2012, 2013

...PF12-7-000; Docket No. PF12-17-000] Jordan Cove Energy Project LP; Pacific Connector...Additional Public Scoping Meetings for the Jordan Cove Liquefaction and Pacific Connector...public scoping meetings to take comments on Jordan Cove Energy Project LP's (Jordan...

2012-09-27

110

Nitrogen heat pipe for cryocooler thermal shunt  

SciTech Connect

A nitrogen heat pipe was designed, built and tested for the purpose of providing a thermal shunt between the two stages of a Gifford-McMahan (GM) cryocooler during cooldown. The nitrogen heat pipe has an operating temperature range between 63 and 123 K. While the heat pipe is in the temperature range during the system cooldown, it acts as a thermal shunt between the first and second stage of the cryocooler. The heat pipe increases the heat transfer to the first stage of the cryocooler, thereby reducing the cooldown time of the system. When the heat pipe temperature drops below the triple point, the nitrogen working fluid freezes, effectively stopping the heat pipe operation. A small heat leak between cryocooler stages remains because of axial conduction along the heat pipe wall. As long as the heat pipe remains below 63 K, the heat pipe remains inactive. Heat pipe performance limits were measured and the optimum fluid charge was determined.

Prenger, F.C.; Hill, D.D.; Daney, D.E.; Daugherty, M.A. [Los Alamos National Lab., NM (United States); Green, G.F.; Roth, E.W. [Naval Surface Warfare Center, Annapolis, MD (United States)

1995-09-01

111

Ventriculoperitoneal Shunt Failure as a Complication of Laparoscopic Surgery  

PubMed Central

Objective: The authors report the first documented case of laparoscopically induced Ventriculoperitoneal (VP) shunt failure. Summary Background Data: Laparoscopic surgery has become a preferred method of accessing and treating a variety of intraperitoneal pathology. Surgeons can expect to encounter patients who have previously under-gone placement of cerebrospinal fluid (CSF) shunts who present as candidates for laparoscopic procedures. Currently, the presence of a CSF shunt is not considered to be a contraindication to laparoscopy. We report the first documented case of laparoscopically induced VP shunt failure. Clinical History: A patient with shunt-dependent hydrocephalus underwent laparoscopic placement of a feeding jejunostomy. Postoperatively, clinical and radiographic evidence of shunt failure was noted. The patient under-went emergent shunt revision. Intraoperatively, an isolated distal shunt obstruction was encountered. Gentle irrigation cleared the occlusion. We believe that this shunt dysfunction was secondary to impaction of either soft tissue or air within the distal catheter as a consequence of peritoneal insufflation. Conclusions: It is concluded that laparoscopic surgery may represent a potential danger in patients with pre-existing CSF shunts. The risk of neurological injury faced by this patient population during laparoscopy is derived from peritoneal insufflation and relates to two primary concerns. The first is impaired CSF drainage due to a sustained elevated distal pressure gradient or, as in our case, an acute distal catheter obstruction. The second concern relates to the potential for retrograde insufflation of the CSF spaces through an incompetent shunt valve mechanism. Distal shunt catheter externalization performed in conjunction with a neurosurgeon during the laparoscopic procedure would prevent these complications. Internalization of the distal shunt catheter would then be performed at the completion of the laparoscopic procedure.

Baskin, Jonathan J.; Vishteh, A. Giancarlo; Wesche, Daniel E.; Carrion, Carlos A.

1998-01-01

112

Syringoperitoneal shunt for treatment of cord cavitation.  

PubMed Central

A series of twenty-nine patients with cord cavitation were treated by syringoperitoneal shunt. Twenty-two of them showed improvement after operation, five were unchanged and two worsened. Operation was performed in patients with post-traumatic cystic myelopathy, idiopathic syringomyelia, intramedullary tumours associated with cysts, and patients who had developed cystic myelopathy in association with spinal arachnoiditis. Pain improved in twenty patients, sensory symptoms and signs in eleven and weakness in ten. Images

Suzuki, M; Davis, C; Symon, L; Gentili, F

1985-01-01

113

Association of intraventricular hemorrhage secondary to prematurity with cerebrospinal fluid shunt surgery in the first year following initial shunt placement  

PubMed Central

Object The neurosurgical literature has conflicting findings regarding the association between indications for CSF shunt placement and subsequent shunt surgery. The object of this study was to identify baseline factors at the time of initial CSF shunt placement that are independently associated with subsequent surgery. Methods This was a retrospective cohort study of children ages 0–18 years who underwent initial CSF shunt placement between January 1, 1997, and October 12, 2006, at a tertiary care children’s hospital. The outcome of interest was CSF shunt surgery (either for revision or infection) within 12 months after initial placement. Associations between subsequent CSF shunt surgery and indication for the initial shunt, adjusting for patient age and surgeon factors at the time of initial placement, were estimated using multivariate logistic regression. Medical and surgical decisions, which varied according to surgeon, were examined separately in a univariate analysis. Results Of the 554 children in the study cohort, 233 (42%) underwent subsequent CSF shunt surgery, either for revision (167 patients [30%]) or infection (66 patients [12%]). In multivariate logistic regression modeling, significant risk factors for subsequent CSF shunt surgery included (compared with aqueductal stenosis) intraventricular hemorrhage (IVH) secondary to prematurity (adjusted odds ratio [AOR] 2.2, 95% CI 1.1–4.5) and other unusual indications (AOR 3.7, 95% CI 1.0–13.6). The patient’s age at initial CSF shunt placement was not significantly associated with increased odds of subsequent surgery after adjusting for other associated factors. Conclusions The occurrence of IVH is associated with increased odds of subsequent CSF shunt surgery within 12 months after shunt placement. Families of and care providers for children with IVH should be attuned to their increased risk of shunt failure.

Simon, Tamara D.; Whitlock, Kathryn B.; Riva-Cambrin, Jay; Kestle, John R. W.; Rosenfeld, Margaret; Dean, J. Michael; Holubkov, Richard; Langley, Marcie; Mayer-Hamblett, Nicole

2012-01-01

114

Transient arthritis with positive tests for rheumatoid factor as presenting sign of shunt nephritis  

Microsoft Academic Search

Shunt nephritis is a rare complication of a chronically infected ventriculoatrial shunt. A 17 year old boy is described, with arthritis in both ankles and positive rheumatoid factor tests, who presented with symptoms of shunt nephritis. Blood cultures were positive for Staphylococcus epidermidis. The patient recovered completely after removal of the shunt and antibiotic treatment. Shunt nephritis should be considered

E J ter Borg; M H Van Rijswijk; C G Kallenberg

1991-01-01

115

Efficacy of Seprafilm® in Abdominal Surgery for Ventriculoperitoneal Shunt Malfunction: A Report of Two Pediatric Cases  

Microsoft Academic Search

Temporary external drainage with adequate antibiotic treatment followed by ventriculoperitoneal (VP) shunt reinsertion is necessary to treat VP shunt malfunction with infection. In surgeries for VP shunt reinsertion, the key factors that determine whether the reinserted VP shunt will function sufficiently are adequate adhesiolysis and safe placement of the VP shunt within a satisfactory peritoneal location. Based on these factors,

Kohei Otake; Keiichi Uchida; Mikihiro Inoue; Kohei Matsushita; Kiyoshi Hashimoto; Shozo Ide; Toshio Matsubara; Kouji Tanaka; Yasuhiko Mohri; Masato Kusunoki

2011-01-01

116

Peritoneovenous shunt occlusion. Etiology, diagnosis, therapy.  

PubMed Central

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.

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

1984-01-01

117

Ventriculoperitoneal shunt infection following uterine instrumentation for dysfunctional uterine bleeding.  

PubMed

Shunt infections are most common within the first 6months following implantation. A shunt infection 19years after implantation secondary to uterine ablation has not been reported to our knowledge. Office hysteroscopic procedures have become commonplace in gynecologic practice. Infectious complication rates are low, but peritonitis has been described. We present a patient with a ventriculoperitoneal shunt infection following a uterine ablation for dysfunctional uterine bleeding. Three days following the ablation she developed abdominal pain. CT scan of the abdomen 5months after the procedure revealed a pseudocyst. She then underwent removal of her shunt with intra-operative cultures revealing Streptococcus agalactiae. Definitive treatment consisted of shunt explantation and antibiotic treatment with complete resolution of her pain and pseudocyst. Consideration for prophylactic antibiotics should be made when a patient with a ventriculoperitoneal shunt undergoes any transvaginal procedure. PMID:24656752

Shaw, Andrew B; Marlin, Evan S; Ikeda, Daniel S; Ammirati, Mario

2014-08-01

118

Reducing the inductance requirements of piezoelectric shunt damping systems  

Microsoft Academic Search

Structural vibration can be reduced by shunting an attached piezoelectric transducer (PZT) with an electrical impedance. Current shunt circuit designs, e.g. a single-mode inductor–resistor network, typically require large inductance values of up to thousands of henries. In practice, discrete inductors are limited in size to around 1 H. By placing an additional capacitance across the terminals of the PZT, shunt

A J Fleming; S Behrens; S O R Moheimani

2003-01-01

119

Vibration Suppression of Flexible Beam Using Electromagnetic Shunt Damper  

Microsoft Academic Search

In this paper, the electromagnetic shunt damper was newly developed to passively suppress the vibration of the flexible cantilever beams. The electromagnetic shunt damper, which is electro-mechanically coupled with the flexible structures, simply consists of a coil, a permanent magnet, and an R-C circuit. The ends of the conductive coil are connected to the R-C series shunt circuit. The vibration

Tai-Hong Cheng; Il-Kwon Oh

2009-01-01

120

Reducing the inductance requirements of piezoelectric shunt damping systems  

Microsoft Academic Search

Structural vibration can be reduced by shunting an attached piezoelectric transducer (PZT) with an electrical impedance. Current shunt circuit designs, e.g. a single-mode inductor-resistor network, typically require large inductance values of up to thousands of henries. In practice, discrete inductors are limited in size to around 1 H. By placing an additional capacitance across the terminals of the PZT, shunt

A. J. Fleming; S. Behrens; S. O. R. Moheimani

2003-01-01

121

Image-guided placement of ventricular shunt catheter  

Microsoft Academic Search

The position of the ventricular shunt catheter is by far most important factor in the long-term patency of a cerebrospinal fluid shunt. However, standard technique, which relies on surface anatomic landmarks and the surgeon’s sense of spatial orientation, is not consistently accurate in the positioning the ventricular shunt catheter. Image guidance provides not only a three-dimensional reconstruction of the ventricular

Yong Bae Kim; Jae Whan Lee; Kyu Sung Lee; Kyu Chang Lee

2006-01-01

122

Spontaneous Portoazygos Shunt in a Patient with Portal Hypertension  

PubMed Central

We present a case of spontaneous portoazygos shunt in a patient with liver cirrhosis and portal hypertension. The shunt was incidentally detected by abdominal magnetic resonance imaging for routine evaluation of liver cirrhosis. Multiplanar reconstruction images demonstrated the portal vein communicating with the azygos vein that was dilated and tortuous along its course to the mediastinum. Although there has been a case of congenital portoazygos shunt reported in a neonate with multiple congenital anomalies, to the best of our knowledge, this is the first case of spontaneous portoazygos shunt developed in an adult with portal hypertension.

Gebrael, Jacob; Yu, Hyeon; Hyslop, William Brian

2013-01-01

123

Huge Thrombosis as a Consequence of VA-Shunts  

Microsoft Academic Search

\\u000a \\u000a Objective  Thrombosis is a rare but serious consequence of VA-shunts. We present two cases of near fatal thrombosis and its successful\\u000a (but in case 2, atypical) management.\\u000a \\u000a \\u000a \\u000a \\u000a Results  Case 1: A 38-year-old woman with VA-shunt suffered from rapidly progressing heart failure and later from progressing underdrainage\\u000a signs nine years after shunting due to a thrombus on the atrial shunt catheter that occluded

Michael Kiefer; Regina Eymann

124

Mitra shunt (spleen preserving, side to side lieno-renal shunt) for portal hypertension with hypersplenism in early infancy.  

PubMed

Extrahepatic portal vein obstruction (EHPVO) is the commonest cause of portal hypertension presenting with gastrointestinal bleeding and splenomegaly. Medical management of this condition may provide relief, but involves repeated hospital visits and endoscopic procedures. Surgery is an effective curative solution by lowering portal venous pressure with effective shunting of venous blood from splanchnic to systemic circulation. Shunt surgery for such a small baby has not been previously reported and splenectomy has its own problems. Similarly, banding or sclerotherapy in such babies is not without risk. Among the various shunt options, Mitra shunt (spleen preserving, side-to-side lienorenal shunt), developed and standardized in our own country, stands out as the most optimum surgical treatment for EHPVO in early infancy. We report a 4-month-old baby, youngest recipient of Mitra shunt reported in literature with successful outcome. PMID:24741213

Shinde, Sangram; Gopalan, Sarath; Kandpal, Deepak K; Chowdhary, Sujit K

2014-04-01

125

Mitra shunt (spleen preserving, side to side lieno-renal shunt) for portal hypertension with hypersplenism in early infancy  

PubMed Central

Extrahepatic portal vein obstruction (EHPVO) is the commonest cause of portal hypertension presenting with gastrointestinal bleeding and splenomegaly. Medical management of this condition may provide relief, but involves repeated hospital visits and endoscopic procedures. Surgery is an effective curative solution by lowering portal venous pressure with effective shunting of venous blood from splanchnic to systemic circulation. Shunt surgery for such a small baby has not been previously reported and splenectomy has its own problems. Similarly, banding or sclerotherapy in such babies is not without risk. Among the various shunt options, Mitra shunt (spleen preserving, side-to-side lienorenal shunt), developed and standardized in our own country, stands out as the most optimum surgical treatment for EHPVO in early infancy. We report a 4-month-old baby, youngest recipient of Mitra shunt reported in literature with successful outcome.

Shinde, Sangram; Gopalan, Sarath; Kandpal, Deepak K.; Chowdhary, Sujit K.

2014-01-01

126

LP/POMDP Marriage: Optimization with Imperfect Information.  

National Technical Information Service (NTIS)

A new technique for solving large-scale allocation problems with partially observable states and constrained action and observation resources is introduced. The technique uses a master linear program (LP) to determine allocations among a set of control po...

A. R. Washburn K. A. Yost

2000-01-01

127

Exhaust Emissions from Seven LP Gas Powered Vehicles.  

National Technical Information Service (NTIS)

An evaluation was undertaken of seven LP gas powered, standard sized American cars. The cars were equipped with V-8 engines, automatic transmissions and Algas Industries dual fuel carburetion systems. Each car was tested according to the proposed 1972 Fed...

H. A. Ashby

1970-01-01

128

Policy Manual - Patient Privacy - Information Life Cycle for LP  

Cancer.gov

The information life cycle describes how information is collected, used, and disseminated in the LP and is generally the same throughout the pathology industry, with the exception that we do not bill for services.

129

Smell of Danger: An Analysis of LP-Gas Odorization  

Microsoft Academic Search

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.

WILLIAM S. CAIN; AMOS TURK

1985-01-01

130

Oxidized Phospholipids, Lp(a) Lipoprotein, and Coronary Artery Disease  

Microsoft Academic Search

background Lp(a) lipoprotein binds proinflammatory oxidized phospholipids. We investigated whether levels of oxidized low-density lipoprotein (LDL) measured with use of mono- clonal antibody E06 reflect the presence and extent of obstructive coronary artery dis- ease, defined as a stenosis of more than 50 percent of the luminal diameter. methods Levels of oxidized LDL and Lp(a) lipoprotein were measured in a

Sotirios Tsimikas; Emmanouil S. Brilakis; Elizabeth R. Miller; Joseph P. McConnell; Ryan J. Lennon; Kenneth S. Kornman; Joseph L. Witztum; Peter B. Berger

2010-01-01

131

Immunochemical quantification of human plasma Lp(a) lipoprotein  

Microsoft Academic Search

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%,

John J. Albers; William R. Hazzard

1974-01-01

132

Huge splenic artery aneurysm after portocaval shunt.  

PubMed

A 64-year-old man with cirrhosis of the liver had a palpable, pulsatile palm-size mass over the upper abdomen. Splenic artery aneurysm was diagnosed by sonography, computed tomography scan, and celiac angiography. Operative findings showed a huge splenic artery aneurysm (20 X 30 X 20 cm) over the middle portion of the splenic artery. Such a huge splenic artery aneurysm may develop because changes in splenic circulatory dynamics after a portocaval shunt, resulting in compression of the splenic vein and congestive splenomegaly. PMID:3183329

Tam, T N; Lai, K H; Tsai, Y T; Lee, S D; Lay, C S; Ng, W W; Lo, G H; Lin, H J; Lee, F Y; Yu, T J

1988-10-01

133

Shunting branch of portal vein and stent position predict survival after transjugular intrahepatic portosystemic shunt  

PubMed Central

AIM: To evaluate the effect of the shunting branch of the portal vein (PV) (left or right) and the initial stent position (optimal or suboptimal) of a transjugular intrahepatic portosystemic shunt (TIPS). METHODS: We retrospectively reviewed 307 consecutive cirrhotic patients who underwent TIPS placement for variceal bleeding from March 2001 to July 2010 at our center. The left PV was used in 221 patients and the right PV in the remaining 86 patients. And, 224 and 83 patients have optimal stent position and sub-optimal stent positions, respectively. The patients were followed until October 2011 or their death. Hepatic encephalopathy, shunt dysfunction, and survival were evaluated as outcomes. The difference between the groups was compared by Kaplan-Meier analysis. A Cox regression model was employed to evaluate the predictors. RESULTS: Among the patients who underwent TIPS to the left PV, the risk of hepatic encephalopathy (P = 0.002) and mortality were lower (P < 0.001) compared to those to the right PV. Patients who underwent TIPS with optimal initial stent position had a higher primary patency (P < 0.001) and better survival (P = 0.006) than those with suboptimal initial stent position. The shunting branch of the portal vein and the initial stent position were independent predictors of hepatic encephalopathy and shunt dysfunction after TIPS, respectively. And, both were independent predictors of survival. CONCLUSION: TIPS placed to the left portal vein with optimal stent position may reduce the risk of hepatic encephalopathy and improve the primary patency rates, thereby prolonging survival.

Bai, Ming; He, Chuang-Ye; Qi, Xing-Shun; Yin, Zhan-Xin; Wang, Jian-Hong; Guo, Wen-Gang; Niu, Jing; Xia, Jie-Lai; Zhang, Zhuo-Li; Larson, Andrew C; Wu, Kai-Chun; Fan, Dai-Ming; Han, Guo-Hong

2014-01-01

134

LP1845 Liquid Gun Propellant Dermal Toxicity Studies: CHO/HGPRT Gene Mutation Assay of LP1846 Liquid Gun Propellant.  

National Technical Information Service (NTIS)

The purpose of this study was to evaluate LP1846 Liquid Gun Propellant for toxicity and mutagenic activity at the hypoxanthine-guanine phosphoribosyl transferase (HGPRT) locus in Chinese hamster ovary (CHO) cells. Mutant (HGPRT-) cells were identified by ...

C. J. Rudd, P. S. Lee

1990-01-01

135

Late ventriculoperitoneal shunt infection caused by Shewanella algae.  

PubMed

We present a case of ventriculitis and peritonitis in a child with ventriculoperitoneal shunt, which occurred 5 years after the surgery. The infection developed after contact with seawater and began as otitis. For the first time, Shewanella algae, a marine microorganism, was identified as the cause of ventriculoperitoneal shunt infection. PMID:19952978

Sardelic, Sanda; Karanovic, Jakica; Rubic, Zana; Polic, Branka; Ledenko, Vlatko; Markic, Josko; Mestrovic, Julije

2010-05-01

136

49 CFR 236.724 - Circuit, shunt fouling.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Circuit, shunt fouling. 236.724 Section 236.724 Transportation... Definitions § 236.724 Circuit, shunt fouling. The track circuit in the fouling section of a turnout, connected in multiple...

2013-10-01

137

49 CFR 236.724 - Circuit, shunt fouling.  

Code of Federal Regulations, 2010 CFR

...2009-10-01 2009-10-01 false Circuit, shunt fouling. 236.724 Section 236.724 Transportation... Definitions § 236.724 Circuit, shunt fouling. The track circuit in the fouling section of a turnout, connected in multiple...

2009-10-01

138

49 CFR 236.724 - Circuit, shunt fouling.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Circuit, shunt fouling. 236.724 Section 236.724 Transportation... Definitions § 236.724 Circuit, shunt fouling. The track circuit in the fouling section of a turnout, connected in multiple...

2010-10-01

139

Gastro-portal shunt for portal hypertension in children  

Microsoft Academic Search

Purpose Extra-hepatic portal venous obstruction (EHPVO) is the most common cause of portal hypertension in children. The Rex shunt has been employed successfully to treat patients with extra-hepatic portal hypertension. In the conventional Rex shunt, the internal jugular vein is used as a venous graft. Inevitably, such a procedure requires neck exploration and sacrifice of internal jugular vein. The authors

Jin-Shan Zhang; Long Li; Shu-Li Liu; Wei Cheng; Mei Diao; Wen-Ying Hou; Jun Zhang; Sheng-Li Li; Yao Liu; Hai-Bin Wang; An-Xiao Ming

140

Glaucoma associated with epithelial downgrowth controlled with Molteno tube shunts.  

PubMed

We report two histopathologically proven cases of epithelial downgrowth in which the secondary glaucoma was controlled by a double-plate Molteno tube shunt and useful vision restored with a penetrating keratoplasty. The combination of a tube shunt and penetrating keratoplasty may be indicated to maintain useful vision in advanced cases of epithelial downgrowth associated with secondary glaucoma. PMID:1494431

Costa, V P; Katz, L J; Cohen, E J; Raber, I M

1992-12-01

141

Portacaval shunt in a calf: Clinical, pathologic, and ultrasonographic findings  

PubMed Central

A calf with a previous history of lameness was presented for weakness and anorexia. Increased liver enzymes and difficulty in assessing the portal system by ultrasonography were compatible with liver disease. Doppler ultrasonography revealed an extrahepatic portacaval shunt. This is the first ultrasonographic description of extra-hepatic portacaval shunt in a ruminant.

Buczinski, Sebastien; Duval, Julie; d'Anjou, Marc-Andre; Francoz, David; Fecteau, Gilles

2007-01-01

142

Multimode shunt damping of piezoelectric smart panel for noise reduction  

Microsoft Academic Search

Multimode shunt damping of piezoelectric smart panel is studied for noise reduction. Piezoelectric smart panel is a plate structure on which a piezoelectric patch is attached with an electrical shunt circuit. When an incidence sound is impinged on the panel structure, the structure vibrates and the attached piezoelectric patch produces an electrical energy, which can be effectively dissipated as heat

Jaehwan Kim; Joon-Hyoung Kim

2004-01-01

143

Noise reduction performance of smart panels incorporating piezoelectric shunt damping  

Microsoft Academic Search

Performance test for transmitted noise reduction of smart panels is experimentally studied. Smart panel is a panel that is utilized a passive material at high frequencies and piezoelectric shunt damping at low frequencies. A multi-mode shunt damping is investigated by using the tuning method based on measured electrical impedance. Three configurations of smart panels are tested: single panel, single panel

Jaehwan Kim; Jin-Young Choi; Ran H. Cabell

2002-01-01

144

A broadband controller for shunt piezoelectric damping of structural vibration  

Microsoft Academic Search

In this paper a broadband active shunt technique for controlling vibration in piezoelectric laminated structures is proposed. The effect of the negative capacitance controller is studied theoretically and then validated experimentally on a piezoelectric laminated simply supported plate. The 'negative capacitance controller' is similar in nature to passive shunt damping techniques, as a single piezoelectric transducer is used to dampen

S. Behrens; A. J. Fleming; S. O. R. Moheimani

2003-01-01

145

Adaptive multi-mode resonant piezoelectric shunt damping  

Microsoft Academic Search

Multiple-modes of structural vibration can be suppressed through the connection of an electrical impedance to the terminals of a bonded piezoelectric transducer. The so-called resonant shunts, one commonly used class of shunt impedances, provide good nominal damping performance but they are highly sensitive to variations in transducer capacitance and structural resonance frequencies. This paper introduces a new technique for the

Dominik Niederberger; Andrew Fleming; S. O. Reza Moheimani; Manfred Morari

2004-01-01

146

On the feedback structure of wideband piezoelectric shunt damping systems  

Microsoft Academic Search

This paper studies the feedback structure associated with piezoelectric shunt damping systems and introduces a new impedance structure for multi-mode piezoelectric shunt damping. The impedance is shown to be realizable using passive circuit components and digital implementation of the associated admittance transfer function is discussed.

S. O. Reza Moheimani; Andrew J. Fleming; Sam Behrens

2003-01-01

147

Piezo shunt power flow optimization for composite beam stabilization  

Microsoft Academic Search

Numerical and technological tools have been developed for complete electromechanical integration of innovative shunting damping strategies for piezoelectric composite beam stabilization to realize a new type of hybrid piezo-composite smart structure. The approach enhances the performance of fully passive configurations to control mechanical power flow in a beam by using negative capacitance elements. In contrast to passive shunted components that

Manuel Collet; Kenneth A. Cunefare; Benjamin Beck

2008-01-01

148

A broadband controller for shunt piezoelectric damping of structural vibration  

Microsoft Academic Search

In this paper a broadband active shunt technique for controlling vibration in piezoelectric laminated structures is proposed. The effect of the negative capacitance controller is studied theoretically and then validated experimentally on a piezoelectric laminated simply supported plate. The ‘negative capacitance controller’ is similar in nature to passive shunt damping techniques, as a single piezoelectric transducer is used to dampen

S Behrens; A J Fleming; S O R Moheimani

2003-01-01

149

Noise reduction using smart panel with shunt circuit  

Microsoft Academic Search

In this paper, piezoelectric smart panels featuring shunt damping are designed and tested for broadband noise reduction. Electrical admittance is introduced to represent electro-mechanical characteristics of piezoelectric smart structures and to predict the performance of piezoelectric shunt damping as a design index of the system. The location and size of piezoelectric patches on the host panel are optimized by taking

Li Jie Zhao; Heung Soo Kim; Jaehwan Kim

2006-01-01

150

Development of Pulmonary Hypertension in Adults after Ventriculoatrial Shunt Implantation  

Microsoft Academic Search

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

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

2009-01-01

151

Linezolid treatment of ventriculoperitoneal shunt infection without implant removal.  

PubMed

Ventriculoperitoneal shunt infection is a serious clinical problem for which implant removal is considered the treatment of choice. However, surgery is sometimes associated with considerable risks that may outweigh the benefits. Presented here is a case of ventriculoperitoneal shunt infection treated successfully with linezolid without implant removal. This case shows linezolid could be a therapeutic alternative when surgery is contraindicated. PMID:16187055

Castro, P; Soriano, A; Escrich, C; Villalba, G; Sarasa, M; Mensa, J

2005-09-01

152

Thermography – a valuable tool to test hydrocephalus shunt patency  

Microsoft Academic Search

Introduction. Shunt-function in hydrocephalic patients is verified by clinical examination and repeated cranial computed tomography (CCT) in most cases. Because of the disadvantages of multiple radiation especially in children it was our aim to introduce video-thermography as a simple and non-invasive methodology to evaluate shunt function.

C. Goetz; D. Foertsch; J. Schoenberger; E. Uhl

2005-01-01

153

Ventriculosubgaleal Shunts for Posthemorrhagic Hydrocephalus in Premature Infants  

Microsoft Academic Search

Objective: The early management of posthemorrhagic hydrocephalus in premature infants is challenging and controversial. These infants need a temporary cerebrospinal fluid (CSF) diversion procedure until they gain adequate weight, and the blood and protein levels in CSF are reasonably low before permanent shunt can be placed. Various options are available with their associated advantages and disadvantages. Ventriculosubgaleal shunts have been

Brian K. Willis; Cherukuri Ravi Kumar; Esther L. Wylen; Anil Nanda

2005-01-01

154

Hepatic cerebrospinal fluid pseudocyst: A rare complication of ventriculoperitoneal shunt  

PubMed Central

Background: Ventriculoperitoneal (VP) shunts are among the most frequently performed operations in the management of hydrocephalus. Hepatic cerebrospinal fluid (CSF) pseudocyst is a rare but important complication in patients with a VP shunt insertion. In addition to presenting our own case, we performed a PubMed search to comprehensively illustrate the predisposing factors, clinical picture, diagnostic methods, and surgical treatment. This article represents an update for this condition. Case Description: A 40-year-old male was admitted to a hospital complaining of fever, abdominal distention, and pain. He had undergone a VP shunt for communicating hydrocephalus caused by a head trauma one year earlier. Laboratory studies showed liver enzymes alterations, and imaging studies demonstrated a well-defined intraaxially hepatic cyst with the shunt catheter placed inside. Staphylococcus epidermis was cultured via CSF. After removing the VP shunt and an adequate antibiotic treatment, the complication of hepatic CSF pseudocyst was resolved. Conclusion: Hepatic CSF pseudocyst is a rare complication of a VP shunt. Once the diagnosis is verified and if the CSF is sterile, just simply remove the peritoneal catheter and reposition a new one in the abdomen. We believe that it is not necessary to remove or aspirate the hepatic intraaxial pseudocyst, because of the risk of bleeding. In case of CSF infection, the VP shunt can be removed and/or an external derivation can be made, and after treatment with antibiotics, a new VP shunt is placed in the opposite side of the peritoneum.

Dabdoub, Carlos B.; Fontoura, Emilio A.; Santos, Egmond A.; Romero, Paulo C.; Diniz, Cristiano A.

2013-01-01

155

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

...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...

2012-09-20

156

Shunt attachment and method for interfacing current collection systems  

DOEpatents

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.

Denney, Paul E. (State College, PA) [State College, PA; Iyer, Natraj C. (Columbia, SC) [Columbia, SC; Hannan, III, William F. (Monroeville Boro, PA)

1992-01-01

157

Repeated cannulation of umbilical hernia with Ventriculoperiotoneal shunt catheter  

PubMed Central

Ventriculoperitoneal (VP) shunts are commonly used to manage hydrocephalus in both adult and paediatric populations. Whilst infection remains by far the most common complication leading to shunt revision other causes need to be considered. Our case report examines a 62-year-old female who presents for operative management of a Choroid Plexus Papilloma. Post-operatively she develops hydrocephalus and is managed with a VP shunt. Interestingly the distal end of the catheter cannulated an unknown umbilical hernia twice creating diagnostic dilemma. Issues around shunt insertion in the morbidly obese population and the basic science behind cerebrospinal fluid reabsorption are explored. Although this is a rare complication it should be considered in any post-operative shunt patient is slow to recover particularly if they are obese.

Laidlaw, R.S.; Little, N.

2014-01-01

158

Vibration damping with negative capacitance shunts: theory and experiment  

NASA Astrophysics Data System (ADS)

This paper analyzes in detail the enhancement of piezoelectric stack transducers by means of the well known 'negative' capacitive shunting. The stability is thoroughly studied: starting from the electrical admittance curve of the transducer, a method is introduced that quantifies the stability margins of the shunted structure. Two different implementations (series vs parallel) are investigated, and the lack of robustness of the parallel one is demonstrated. Next, this technique is experimentally applied on a truss structure. Its performances are compared with those of passive shunt circuits and with those of an active control law, the so-called Integral Force Feedback or IFF. As expected, the damping introduced by the negative capacitance shunt is larger than the damping obtained with the passive shunts; it remains, however, one order of magnitude smaller than that obtained with the IFF.

de Marneffe, B.; Preumont, A.

2008-06-01

159

Shunt attachment and method for interfacing current collection systems  

DOEpatents

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.

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

1992-12-08

160

Repeated cannulation of umbilical hernia with Ventriculoperiotoneal shunt catheter.  

PubMed

Ventriculoperitoneal (VP) shunts are commonly used to manage hydrocephalus in both adult and paediatric populations. Whilst infection remains by far the most common complication leading to shunt revision other causes need to be considered. Our case report examines a 62-year-old female who presents for operative management of a Choroid Plexus Papilloma. Post-operatively she develops hydrocephalus and is managed with a VP shunt. Interestingly the distal end of the catheter cannulated an unknown umbilical hernia twice creating diagnostic dilemma. Issues around shunt insertion in the morbidly obese population and the basic science behind cerebrospinal fluid reabsorption are explored. Although this is a rare complication it should be considered in any post-operative shunt patient is slow to recover particularly if they are obese. PMID:24903026

Laidlaw, R S; Little, N

2014-01-01

161

Syringomyelia Regression after Shunting of a Trapped Fourth Ventricle  

PubMed Central

We describe a case of progressive syringomyelia following post-infectious trapped fourth ventricle (TFV), which resolved after shunting of the fourth ventricle. A 28-year-old female who had previously undergone treatment of intracerebral hemorrhage and meningitis developed a hydrocephalus with TFV. After 3 years she developed disturbance of walking and coordination. Cranial-CT revealed an enlargement of the shunted fourth ventricle as a result of shunt dysfunction. Furthermore a cervical syringomyelia developed. The patient underwent a revision of a failed fourth ventriculo-peritoneal shunt. Postoperatively, syringomyelia resolved within 6 months and the associated neurological deficits improved significantly. An insufficiency of cerebrospinal fluid draining among patients with TFV can be associated with communicating syringomyelia. An early detection and treatment seems important on resolving syringomyelia and avoiding permanent neurological deficits. Ventriculo-peritoneal shunt in trapped fourth ventricles can resolve a secondary syringomyelia.

Morina, Dukagjin; Petridis, Athanasios K.; Fritzsche, Friederike S.; Ntoulias, Georgios; Scholz, Martin

2013-01-01

162

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

...79-0452] Montreux Equity Partners II SBIC, L.P.; Montreux Equity Partners III SBIC, L.P.; Notice Seeking Exemption Under Section 312...hereby given that Montreux Equity Partners II SBIC, L.P. and Montreux Equity Partners III SBIC,...

2010-04-21

163

LP DAAC and MEaSUREs - Optimizing Collection Inception  

NASA Astrophysics Data System (ADS)

The Land Processes Distributed Active Archive Center (LP DAAC) is a selected NASA Earth Observing System (EOS) Data and Information System (EOSDIS) DAAC supporting the Making Earth System Data Records for Use in Research Environments (MEaSUREs) Program to contribute in providing long-term, consistent, and mature data products. The LP DAAC has identified three essential components for the MEaSUREs collection inception. The first component includes a framework of LP DAAC's data lifecycle including overall inception of products, curation of products, and long-term archiving of products. The second component fuses data producer and data provider operations, interleaving key personnel into key processes throughout the project. The third component integrates and evolves stakeholder elements into a standard methodology, alongside affording an overall homogeneous data delivery system for MEaSUREs collections. As an active participant on the Metadata Evolution for NASA Data Systems (MENDS) Tiger Team, the LP DAAC is working to categorize all data model elements into the ISO 19115 international metadata standard. This poster depicts how each of these three components optimizes the LP DAAC MEaSUREs collection inception process.

Bennett, S.

2013-12-01

164

The hydrokinetic parameters of shunts for hydrocephalus might be inadequate  

PubMed Central

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.

Sotelo, Julio

2012-01-01

165

The hydrokinetic parameters of shunts for hydrocephalus might be inadequate.  

PubMed

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

Sotelo, Julio

2012-01-01

166

Research on spark discharge of floating roof tank shunt  

NASA Astrophysics Data System (ADS)

In order to quantitatively analyze the spark discharge risk of floating roof tank shunts, the breakdown voltage of shunt has been calculated by Townsend theory, the shunt spark discharge experiment is carried out by using 1.2/50 ?s impulse voltage wave, and the relationship between breakdown voltage of shunt spark discharge and air gap is analyzed. It has been indicated by theoretical analysis and experimental study that the small gap is more easily cause spark discharge than the big gap when the contact between shunt and tank shell is poor. When air gap distance is equal to 0.1 cm, average breakdown voltage is 5280 V. When the air gap distance is less than 0.3 cm, experiment data agree well with Townsend theory. Therefore, in the condition of small gap, Townsend theory can be used to calculated breakdown voltage of shunt. Finally, based on the above conclusions, improvements for avoiding the spark discharge risk of shunt of floating roof tanks have been proposed.

Bi, Xiaolei; Liu, Quanzhen; Liu, Baoquan; Gao, Xin; Hu, Haiyan; Liu, Juan

2013-03-01

167

Multimode shunt damping of piezoelectric smart panel for noise reduction.  

PubMed

Multimode shunt damping of piezoelectric smart panel is studied for noise reduction. Piezoelectric smart panel is a plate structure on which a piezoelectric patch is attached with an electrical shunt circuit. When an incidence sound is impinged on the panel structure, the structure vibrates and the attached piezoelectric patch produces an electrical energy, which can be effectively dissipated as heat via the electrical shunt circuit. Since the energy dissipation strongly depends on the vibration mode of the panel structure, many patches are required for multiple vibration modes. Instead of using multiple piezoelectric patches, a single piezoelectric patch is used in conjunction with a blocked shunt circuit for multimode shunt damping. Modeling, shunt parameter tuning, and implementation of the blocked shunt circuit along with an acoustic test of the panel are explained. A remarkable reduction of the transmitted noise was achieved for multiple modes of the panel. Since this technology has many merits in terms of compactness, low cost, robustness, and ease of installation, practical applications in many noise problems can be anticipated. PMID:15376660

Kim, Jaehwan; Kim, Joon-Hyoung

2004-08-01

168

Current status of transjugular intrahepatic portosystemic shunts.  

PubMed Central

The use of the transjugular intrahepatic portosystemic shunt (TIPS) has emerged as an important nonoperative modality for variceal bleeding, intractable ascites, and for selected cases of hepatic venous obstruction. We believe that TIPS should be viewed as a 'bridge' to liver transplantation and should be carried out only in experienced centres. The adverse haemodynamic changes on the cardiopulmonary system after TIPS should be borne in mind. Prospective trials to evaluate the role of TIPS versus sclerotherapy in variceal bleeding will be watched with interest. There is, however, an urgent need to improve long-term results of TIPS as stent thrombosis and stenosis occur frequently. We advocate routine surveillance to detect these problems at an early stage.

Patel, N. H.; Chalasani, N.; Jindal, R. M.

1998-01-01

169

Tikhonov regularization in Lp applied to inverse medium scattering  

NASA Astrophysics Data System (ADS)

This paper presents Tikhonov- and iterated soft-shrinkage regularization methods for nonlinear inverse medium scattering problems. Motivated by recent sparsity-promoting reconstruction schemes for inverse problems, we assume that the contrast of the medium is supported within a small subdomain of a known search domain and minimize Tikhonov functionals with sparsity-promoting penalty terms based on Lp-norms. Analytically, this is based on scattering theory for the Helmholtz equation with the refractive index in Lp, 1 < p < ?, and on crucial continuity and compactness properties of the contrast-to-measurement operator. Algorithmically, we use an iterated soft-shrinkage scheme combined with the differentiability of the forward operator in Lp to approximate the minimizer of the Tikhonov functional. The feasibility of this approach together with the quality of the obtained reconstructions is demonstrated via numerical examples.

Lechleiter, Armin; Kazimierski, Kamil S.; Karamehmedovi?, Mirza

2013-07-01

170

Postnatal Chest Wall Deformities after Fetal Thoracoamniotic Shunting for Congenital Cystic Adenomatoid Malformation  

Microsoft Academic Search

Objectives: Large macrocystic congenital cystic adenomatoid malformations (CCAMs) can be treated with thoracoamniotic (TA) shunting to reduce CCAM volume. Two CCAM fetuses treated with TA shunt had postnatal radiographic rib deformities. Study Design: Retrospective review of prenatal TA shunting for large macrocystic CCAMs evaluated for the presence of rib deformities. Comparison groups not eligible for TA shunting included nonshunted CCAMs

Aziz M. Merchant; William Peranteau; R. Douglas Wilson; Mark P. Johnson; Michael W. Bebbington; Holly L. Hedrick; Alan W. Flake; N. Scott Adzick

2007-01-01

171

Transforming Growth Factor-?1 May Be Involved in Shunt Obstruction in Patients on Chronic Hemodialysis  

Microsoft Academic Search

Obstructed shunt vessels were studied immunohistochemically to clarify the mechanism of shunt obstruction in hemodialysis patients. The subjects were 12 hemodialysis patients with shunt obstruction, and 8 patients newly started on hemodialysis were used as the controls. Cryosections of shunt tissue were prepared and stained for thrombomodulin as well as transforming growth factor-?1 using the enzyme antibody method. In the

Yoshihiko Taniguchi; Noriaki Yorioka; Kazuomi Yamashita; Takao Masaki; Michio Yamakido

1999-01-01

172

Ion beam sputter-etched ventricular catheter for hydrocephalus shunt  

NASA Technical Reports Server (NTRS)

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.

Banks, B. A. (inventor)

1983-01-01

173

Transfemoral vein placement of a ventriculoatrial shunt. Technical note.  

PubMed

Acceptable cavities for the distal portion of a cerebrospinal fluid diversion shunt include the peritoneal, pleural, and atrial cavities. The authors report on a patient in whom placement into the peritoneal cavity failed, the pleural cavity was not an option, and access to the right atrium was not technically possible via standard cannulation techniques into the veins of the neck and shoulder regions. A right ventriculoatrial shunt was thus placed into the right atrium via the ipsilateral femoral vein. Eight months postoperatively, the patient's condition was at baseline and there were no signs of shunt malfunction. This technique may prove useful when other measures have failed. PMID:17233318

Tubbs, R Shane; Barnhart, Douglas; Acakpo-Satchivi, Leslie

2007-01-01

174

Rotationally symmetric solutions to the Lp-Minkowski problem  

NASA Astrophysics Data System (ADS)

In this paper we study the Lp-Minkowski problem for p=-n-1, which corresponds to the critical exponent in the Blaschke-Santalo inequality. We first obtain volume estimates for general solutions, then establish a priori estimates for rotationally symmetric solutions by using a Kazdan-Warner type obstruction. Finally we give sufficient conditions for the existence of rotationally symmetric solutions by a blow-up analysis. We also include an existence result for the Lp-Minkowski problem which corresponds to the super-critical case of the Blaschke-Santalo inequality.

Lu, Jian; Wang, Xu-Jia

175

Efficacy of Seprafilm® in abdominal surgery for ventriculoperitoneal shunt malfunction: a report of two pediatric cases.  

PubMed

Temporary external drainage with adequate antibiotic treatment followed by ventriculoperitoneal (VP) shunt reinsertion is necessary to treat VP shunt malfunction with infection. In surgeries for VP shunt reinsertion, the key factors that determine whether the reinserted VP shunt will function sufficiently are adequate adhesiolysis and safe placement of the VP shunt within a satisfactory peritoneal location. Based on these factors, the prevention of postoperative adhesions after surgery for VP shunt malfunction is very important. We present two cases of shunt malfunction related to infection and report their successful treatment using Seprafilm®. Seprafilm may improve the safety of VP shunt reinsertion and preserve the function of the reinserted VP shunt after VP shunt malfunction with infection. PMID:22041544

Otake, Kohei; Uchida, Keiichi; Inoue, Mikihiro; Matsushita, Kohei; Hashimoto, Kiyoshi; Ide, Shozo; Matsubara, Toshio; Tanaka, Kouji; Mohri, Yasuhiko; Kusunoki, Masato

2011-01-01

176

Ventriculoperitoneal Shunt with Communicating Peritoneal & Subcutaneous Pseudocysts Formation  

PubMed Central

A case of cerebrospinal fluid (CSF) pseudocysts in a patient with a ventriculoperitoneal (VP) shunt is reported to describeacute unusual location of developmentof pseudocyst. In the setting of a VP shunt, the frequency of abdominal CSF pseudocyst formation is approximately 4.5%, often being precipitated by a recent inflammatory/infective process or recent surgery. Larger pseudocysts tend to be sterile, whereas smaller or multiloculated pseudocysts are more often infected. Computed tomography (CT) and ultrasound (US) has characteristic findings. This is an uncommon presentation of VP shunt with no evidence of infection. The objective of this case report is to create awareness about imaging findings of complications of VP shunt at an unusual location.

Sharifa, Al-Duraibi

2014-01-01

177

Energy relaxation mechanisms in capacitively shunted flux qubits  

NASA Astrophysics Data System (ADS)

Energy losses in superconducting qubits remain a major object of study in the road towards scalable, highly coherent qubit devices. The current understanding of the loss mechanisms in these devices is far from being complete and it is sometimes difficult to experimentally separate the different contributions to decoherence. Here we compare a traditional three Josephson-junction flux qubit to the recently implemented capacitively shunted flux qubit [1], whose energy decay is thought to be limited by dielectric losses arising from native oxides in the shunting capacitor. Keeping all parameters identical except for the shunting capacitance, we obtain energy relaxation times that are comparable for both types of qubit. This suggests that the energy relaxation time is not limited by junction losses in capacitively shunted flux qubits. We discuss some other possible loss mechanisms present in these devices. [4pt] [1] M. Steffen et al. Phys. Rev. Lett. 105, 100502 (2010)

Corcoles, Antonio; Rozen, Jim; Rothwell, Mary Beth; Keefe, George; di Vincenzo, David; Ketchen, Mark; Chow, Jerry; Rigetti, Chad; Rohrs, Jack; Borstelmann, Mark; Steffen, Matthias

2011-03-01

178

Hepatic Arterioportal Shunts: Dynamic CT and MR Features  

PubMed Central

With the increased temporal resolution available in dynamic computed tomography (CT) and magnetic resonance imaging (MRI), hepatic arterioportal shunts are now more frequently encountered than in the past. The condition occurs in various hepatic diseases in which portal or hepatic venous flow is compromised. The underlying mechanism and the degree of shunt affect its appearance at dynamic imaging. The dynamic CT and MRI findings have been summarized as early enhancement of peripheral portal veins, and wedge-shaped transient parenchymal enhancement during the hepatic arterial phase. Recognition of arterioportal shunt can suggest the presence of a previously unsuspected disorder and avoids false-positive diagnosis or overestimation of a hepatic disease. Familiarity with the pathophysiology of arterioportal shunt also allows investigation of the hepatic hemodynamic changes occurring in various hepatic diseases.

Lee, Kyoung Ho; Han, Joon Koo; Lee, Jeong Min

2002-01-01

179

Vibration damping with shunted piezoceramics: Fundamentals and technical applications  

NASA Astrophysics Data System (ADS)

This paper describes the damping performance of shunted piezoceramics for passive LR-networks, negative capacitance shunts (LRC) and the SSDI-switching technique. The calculations are based on a general description for mechanical structures with piezoelectric elements. Normalized parameters are introduced and the damping performance described by the generalized electromechanical coupling coefficient. For every electrical shunting the optimal network parameters are determined and the resulting maximum damping is compared. Additionally, a squealing disc brake and a bladed disc model are studied as technical applications. Practical realizations for the inclusion of the piezoelements and measurements are presented which validate the calculated damping performance. In particular, it is shown that the shunted piezoceramics are capable to suppress the brake squealing.

Neubauer, Marcus; Wallaschek, Jörg

2013-03-01

180

Bifrontal epidural haematoma after shunt operation and posterior fossa exploration  

Microsoft Academic Search

A case of bifrontal epidural haematoma secondary to ventriculocardiac (Spitz-Holter) shunt operation and posterior fossa exploration is reported. The relevant literature has been reviewed. The diagnosis of this complication was made by CT scan.

T. G. Tjan; N. J. M. Aarts

1980-01-01

181

An Examination of Applying Shunted Piezoelectrics to Reduce Aeroelastic Response  

NASA Technical Reports Server (NTRS)

Several analytical and experimental studies clearly demonstrate that piezoelectric materials (piezoelectrics) can be used as actuators to actively control vibratory response, including aeroelastic response. However, two important issues in using piezoelectrics as actuators for active control are: 1) the potentially large amount of power required to operate the actuators, and 2) the complexities involved with active control (added hardware, control law design, and implementation). Active or passive damping augmentation using shunted piezoelectrics may provide a viable alternative. This approach requires only simple electrical circuitry and very little or no electrical power. The current study examines the feasibility of using shunted piezoelectrics to reduce aeroelastic response using a typical-section representation of a wing and piezoelectrics shunted with a parallel resistor and inductor. The aeroelastic analysis shows that shunted piezoelectrics can effectively reduce aeroelastic response below flutter and may provide a simple, low-power method of subcritical aeroelastic control.

McGowan, Anna-Maria Rivas

1999-01-01

182

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

183

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

184

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

185

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

186

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

187

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

188

Expanding septum pellucidum cyst due to a traumatic ventriculoperitoneal shunt  

Microsoft Academic Search

A rare complication of a ventriculoperitoneal (VP) shunt is reported. Serial imaging studies demonstrated the formation of\\u000a an expanding septum pellucidum cyst after an indwelling shunt tube penetrated the wall of the septum pellucidum. This complication\\u000a should be borne in mind if patients have symptoms of intermittent obstructive hydrocephalus or related to pressure effects\\u000a from the septum pellucidum after VP

C. J. Chen

1999-01-01

189

Fatal intratumoral hemorrhage in posterior fossa tumors following ventriculoperitoneal shunt  

Microsoft Academic Search

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

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

2009-01-01

190

Vibration control efficiency of piezoelectric shunt damping system  

Microsoft Academic Search

The piezoelectric shunt damping technique based on the direct piezoelectric effect has been known as a simple, low-lost, lightweight,\\u000a and easy to implement method for passive damping control of structural vibration. In this technique, a piezoelectric material\\u000a is used to transform mechanical energy to electrical energy. When applying the piezoelectric shunt damping technique to passively\\u000a control structural vibration, the piezoelectric

Dan Wu; Zhichun Yang; Hao Sun

2009-01-01

191

Glomerulonephritis associated with (infected) ventriculo-atrial shunt  

Microsoft Academic Search

Diffuse glomerulonephritis with the nephrotic syndrome was observed in two patients aged 3 years 8 months and 27 years, both of whom had ventriculo-atrial shunts. Removal of the shunts resulted in marked improvement in the first and complete recovery in the second patient. Serum ß1C-globulin concentrations were initially low and returned to normal values. Cultures taken from cerebrospinal fluid and

Werner Wegmann; Ernst P. Leumann

1973-01-01

192

Linezolid treatment of ventriculoperitoneal shunt infection without implant removal  

Microsoft Academic Search

Ventriculoperitoneal shunt infection is a serious clinical problem for which implant removal is considered the treatment of\\u000a choice. However, surgery is sometimes associated with considerable risks that may outweigh the benefits. Presented here is\\u000a a case of ventriculoperitoneal shunt infection treated successfully with linezolid without implant removal. This case shows\\u000a linezolid could be a therapeutic alternative when surgery is contraindicated.

P. Castro; A. Soriano; C. Escrich; G. Villalba; M. Sarasa; J. Mensa

2005-01-01

193

Treatment of refractory chylothorax with externalized pleuroperitoneal shunts in children  

Microsoft Academic Search

Background. Traditional therapy for refractory chylothorax in the pediatric population has included pleurodesis and thoracic duct ligation. These procedures are associated with high morbidity and questionable success rates.Methods. We retrospectively reviewed our experience with 15 patients who underwent treatment for chylous effusions using pleuroperitoneal shunts with exteriorized pump chambers. Mean patient age at time of shunt placement was 2.1 (0.1

Andrew B Wolff; Mark L Silen; Evan R Kokoska; Bradley M Rodgers

1999-01-01

194

Cerebrospinal fluid ascites: a complication of a ventriculoperitoneal shunt  

PubMed Central

A 1 year old Caucasian male born with an omphalocoele, malrotation of the large bowel, and Ladd's bands developed an E. coli wound infection and subsequent meningitis-ventriculitis which responded to antibiotic therapy. Aqueductal stenosis and obstructive hydrocephalus initially was treated with a ventriculoperitoneal shunt. After a routine diphtheria-pertussis-tetanus immunization, the child developed a CSF ascites which resolved following a ventriculoatrial shunt. Images

Dean, David F.; Keller, Irvin B.

1972-01-01

195

77 FR 30589 - SteelRiver Infrastructure Partners LP, SteelRiver Infrastructure Associates LLC, SteelRiver...  

Federal Register 2010, 2011, 2012, 2013

...SteelRiver Infrastructure Fund North America LP, and Patriot Funding LLC...SteelRiver Infrastructure Fund North America LP (SRIFNA LP), and Patriot...Company (TSRR); (2) Rarus Railway Company; (3) Utah Central Railway Company; (4)...

2012-05-23

196

Sparse Logistic Regression with Lp Penalty for Biomarker Identification  

Microsoft Academic Search

In this paper, we propose a novel method for sparse logistic regression with non-convex regularization Lp (p <1). Based on smooth approximation, we develop several fast algorithms for learning the classifier that is applicable to high dimensional dataset such as gene expression. To the best of our knowledge, these are the first algorithms to perform sparse logistic regression with an

Zhenqiu Liu; Feng Jiang; Guoliang Tian; Suna Wang; Fumiaki Sato; Stephen J. Meltzer; Ming Tan

2007-01-01

197

A piecewise linear approximation procedure for Lp norm curve fitting  

Microsoft Academic Search

There are numerous applications of fitting a linear function to a set of observed points using an objective of minimizing the norm of the error vector in some sense. This paper is concerned with the Lp norm criterion, which for p greater than 1 is equivalent to an unconstrained nonlinear convex minimization problem. Many standard nonlinear algorithms exist to solve

Michael G. Sklar; Ronald D. Armstrong

1995-01-01

198

Tetris: Experiments with the LP Approach to Approximate DP  

Microsoft Academic Search

We study the linear programming (LP) approach to approximate dynamic programming (DP) through experiments with the game of Tetris. Our empirical results suggest that the performance of policies generated by the approach is highly sensitive to how the problem is formulated and the discount factor. Furthermore, we find that, using a state-sampling scheme of the kind proposed in (7), the

Vivek F. Farias; Benjamin Van Roy

199

Pleuroperitoneal shunts in the management of persistent chylothorax.  

PubMed

Between June 1981 and June 1988, we placed pleuroperitoneal shunts in 16 patients for the management of refractory chylothorax on the Pediatric Surgical Service, University of Virginia. The cause of the chylothorax was caval thrombosis from central venous catheters in 5 patients, idiopathic in 3, and mediastinal lymphangioma in 2, and in 6, it developed after a cardiac procedure. Chylothorax in each patient was unresponsive to thoracentesis, tube thoracostomy, and dietary manipulations. A Denver double-valved shunt system is currently employed and is implanted using general anesthesia. Manual pumping is required postoperatively for several months. Twelve (75%) of the 16 patients had excellent results with complete elimination of the chylothorax and resolution of symptoms. In 10 of these 12, the shunt has been removed. Four had an unsatisfactory result: 3 had inferior vena cava hypertension, and 3 were low-birth-weight premature infants. Four patients seen early in this series required revision of the position of the pleural catheter, with successful drainage in each instance. Pleuroperitoneal shunting is a safe, simple, and effective treatment of chylothorax in infants and children. In view of our success in treating chylothorax with these shunts, we recommend early shunting before the development of nutritional or immunological depletion. PMID:2764611

Murphy, M C; Newman, B M; Rodgers, B M

1989-08-01

200

Design of an intelligent and personalised shunting system for hydrocephalus.  

PubMed

Hydrocephalus is a neurological disease that manifests itself in an elevated fluid pressure within the brain, and if left untreated, may be fatal. It is currently treated using shunt implants, which consist of a mechanical valve and tubes that regulate the pressure of cerebrospinal fluid (CSF) by draining excess fluid into the abdomen. Hydrocephalus shunting systems are no longer expected simply to regulate the intracranial pressure (ICP), but also to offer the option of regaining independence of the shunt. Additionally, they could offer personalised valve management which is one of the main limitations of current shunts. This paper describes the design of a multi-agent system for an intelligent and personalised CSF management system. Patient feedback and intracranial pressure readings will play important roles in the process of CSF regulation and weaning, introduces an element of personalisation to the treatment. The new shunting system would deliver both reactive and goal-driven solutions for the treatment, at the same time the intelligent part of the system will be monitoring how well the shunt is performing. These tasks can be achieved by implementing an agent approach in designing this system. Such system would help us to understand more about the dynamics of hydrocephalus. PMID:19162771

Momani, Lina; Alkharabsheh, Abdel Rahman; Al-Nuaimy, Waleed

2008-01-01

201

Aberrant Gene Expression in Dogs with Portosystemic Shunts  

PubMed Central

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.

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

202

Portacaval Shunt Established in Six Dogs Using Magnetic Compression Technique  

PubMed Central

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.

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

2013-01-01

203

Spontaneous bacterial peritonitis in patients with ventriculoperitoneal shunts.  

PubMed

Spontaneous bacterial peritonitis (SBP) is an infection of the peritoneal fluid in the absence of an obvious intra-abdominal source. It is most commonly diagnosed in patients with cirrhotic ascites, although it has been described in other syndromes as well. The organisms most frequently cultured from the peritoneum are those of intestinal flora; however, there are cases which have all the features of SBP, but remain culture negative. This article discusses 7 cases of SBP in patients with ventriculoperitoneal shunts; a combination which has previously not been described. The most significant features of these cases include: a remote history of shunt revision (mean 3.4 years), and cultures consistent with normal intestinal flora. None had a history of recent abdominal surgery, gastrostomy or wire-impregnated catheters. Cerebrospinal fluid cultures are often negative, and when positive, suggest SBP with an ascending shunt infection. While SBP is clearly differentiated from pseudocyst of the abdomen, it may represent a point on the continuum of intra-abdominal processes in the shunted patient. The precise etiology of SBP is unclear. A number of suggested theories are reviewed. It is proposed that patients with shunts may be predisposed to develop SBP because spinal fluid can behave as an ascitic fluid even in the absence of a peritoneal accumulation. Recommendations for the recognition and management of SBP in the shunted patient are discussed in detail. PMID:9419027

Gaskill, S J; Marlin, A E

1997-03-01

204

75 FR 61480 - Gulf South Pipeline Company, LP; Notice of Request Under Blanket Authorization  

Federal Register 2010, 2011, 2012, 2013

...2010, Gulf South Pipeline Company, LP (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, filed a prior...Regulatory Affairs, Gulf South Pipeline Company, LP, 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, telephone...

2010-10-05

205

75 FR 40819 - Gulf South Pipeline Company, LP; Notice of Request Under Blanket Authorization  

Federal Register 2010, 2011, 2012, 2013

...June 23, 2010, Gulf South Pipeline Company, LP (Gulf), 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, filed a prior...of Regulatory Affairs, Boardwalk Pipeline Partners, LP, 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, by telephone...

2010-07-14

206

76 FR 22698 - Gulf South Pipeline Company, LP; Notice of Request Under Blanket Authorization  

Federal Register 2010, 2011, 2012, 2013

...2011, Gulf South Pipeline Company, LP (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, pursuant to its...Regulatory Affairs, Gulf South Pipeline Company, LP, 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, at (713)...

2011-04-22

207

76 FR 44902 - Gulf South Pipeline Company, LP; Notice of Request Under Blanket Authorization  

Federal Register 2010, 2011, 2012, 2013

...2011, Gulf South Pipeline Company, LP (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, TX 77046, filed in Docket No...Regulatory Affairs, Gulf South Pipeline Company, LP, 9 Greenway Plaza, Suite 2800, Houston, TX 77046 at telephone...

2011-07-27

208

76 FR 2370 - Gulf South Pipeline Company, LP; Notice of Request Under Blanket Authorization  

Federal Register 2010, 2011, 2012, 2013

...2010, Gulf South Pipeline Company, LP (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, filed in Docket...and General Counsel, Boardwalk Pipeline Partners, LP, 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, or call...

2011-01-13

209

78 FR 17193 - Gulf South Pipeline Company, LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...2013, Gulf South Pipeline Company, LP (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, filed in Docket...Regulatory Affairs, Gulf South Pipeline Company, LP, 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, or call...

2013-03-20

210

77 FR 65680 - Gulf South Pipeline Company, L.P.; Notice of Request Under Blanket Authorization  

Federal Register 2010, 2011, 2012, 2013

...Gulf South Pipeline Company, L.P. (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, pursuant to the...Kyle Stephens, Gulf South Pipeline Company, L.P., 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, (713)...

2012-10-30

211

78 FR 1850 - Gulf South Pipeline Company, LP; Notice of Application for Abandonment  

Federal Register 2010, 2011, 2012, 2013

...2012, Gulf South Pipeline Company, LP (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, TX 77046, filed in Docket No...Regulatory Affairs, at Boardwalk Pipeline Partners, LP, 9 Greenway Plaza, Suite 2800, Houston, TX 77046, telephone...

2013-01-09

212

77 FR 69449 - Gulf South Pipeline Company, LP; Notice of Request Under Blanket Authorization  

Federal Register 2010, 2011, 2012, 2013

...2012, Gulf South Pipeline Company, LP (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, TX 77046, filed in Docket No...Regulatory Affairs, Boardwalk Pipeline Partners, LP, 9 Greenway Plaza, Suite 2800, Houston, TX 77046 at telephone...

2012-11-19

213

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

Federal Register 2010, 2011, 2012, 2013

...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...

2012-12-13

214

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

Federal Register 2010, 2011, 2012, 2013

...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...

2013-02-20

215

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

Federal Register 2010, 2011, 2012, 2013

...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...

2012-04-11

216

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

Federal Register 2010, 2011, 2012, 2013

...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...

2012-08-21

217

76 FR 57087 - Stone Harbor Investment Partners LP, et al.; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...Release No. 29784; File No. 812-13931] Stone Harbor Investment Partners LP, et al.; Notice...certain financial instruments. Applicants: Stone Harbor Investment Partners LP (``Stone Harbor'') and Stone Harbor Investment...

2011-09-15

218

Criteria of cyclic compactness of the sets from Lp - spaces, associated with vector measure  

NASA Astrophysics Data System (ADS)

We study the conditional expectations in the Lp-modules associated with a partition of unity of a Boolean algebra. Cyclic compactness criteria of the subsets of Lp found in terms of convergent nets of conditional expectations.

Chilin, V.; Rakhimov, B.; Rakhimov, A.

2013-09-01

219

Vibration control of an HDD disk-spindle system utilizing piezoelectric bimorph shunt damping: I. Dynamic analysis and modeling of the shunted drive  

Microsoft Academic Search

This work proposes a new piezoelectric shunt damping methodology to control the vibration of a computer hard disk drive (HDD) disk-spindle system. The first part of this work (part I) deals with dynamic modeling of the piezoelectric shunted drive, while the second part of this work (part II) covers experimental implementation of the proposed shunt circuits. In the modeling, a

S. C. Lim; S. B. Choi

2007-01-01

220

Vibration control of an HDD disk-spindle system using piezoelectric bimorph shunt damping: II. Optimal design and shunt damping implementation  

Microsoft Academic Search

This paper presents the experimental implementation of piezoelectric shunt damping for an HDD disk-spindle system. Prior to evaluating the shunt damping performance of the drive, the piezoelectric bimorph designed in part I is optimally redesigned so as to satisfy desirable shunt damping performance. The electrical admittance of the bimorph is derived from the piezoelectric constitutive equation and stress-strain relationship. Subsequently,

S. C. Lim; S. B. Choi

2007-01-01

221

Vibration control of an HDD disk-spindle system using piezoelectric bimorph shunt damping: II. Optimal design and shunt damping implementation  

Microsoft Academic Search

This paper presents the experimental implementation of piezoelectric shunt damping for an HDD disk-spindle system. Prior to evaluating the shunt damping performance of the drive, the piezoelectric bimorph designed in part I is optimally redesigned so as to satisfy desirable shunt damping performance. The electrical admittance of the bimorph is derived from the piezoelectric constitutive equation and stress–strain relationship. Subsequently,

S C Lim; S B Choi

2007-01-01

222

Seismo-Acoustic LP Swarms at Tungurahua Volcano, Ecuador  

NASA Astrophysics Data System (ADS)

A massive swarm of seismo-acoustic events interrupted a long period of quiescence at Tungurahua Volcano, Ecuador, in May 2010. We present here details of moment tensor solutions to 84 of the event that occurred over the five day crises that include vulcanian explosions, sustained ash emissions, and pyroclastic flows. Long-peroid seismicity at volcanoes have long been considered related to activity of magmatic and hydrothermal fluids. The LP events of Tungurahua were characterized by: 1) an initial vent explosion, 2) an emergent, dilatational first motion seismic arrival, 3) followed by quasi-harmonic coda and volcanic tremor. During the May swarm period, both infrasound and seismic waves exhibited significant, non-isotropic radiation patterns. Wave analysis of the infrasound band acoustic waves showed considerable asymmetry, most likely associated with the truncated bowl shape of the 300 m vent. Acoustic wave propagation was explained using combinations of acoustic monopole and dipole sources to illuminate the explosion dynamics. Seismic moment tensors of LP first motions were estimated by waveform inversion, accounting for the considerable topographic relief of Tungurahua. Particle motion analysis indicates that the LP waves, in the 2-5 s band, are body waves. Although the LP sources cluster at 2 km depth below the vent, the station array does not allow for tight bounds on the depth, and vertical uncertainty is large. The strong association of acoustic blasts and LP waves suggests a shallow source for these events. We present the relation between the acoustic and seismic source mechanisms with time over the period.

Kim, K.; Lees, J. M.; Ruiz, M. C.

2012-12-01

223

Black-white differences in serum Lp(a) lipoprotein levels.  

PubMed

Serum Lp(a) lipoprotein was determined in 81 black and 81 white healthy men and women matched for sex and age. The results show a highly significant increase of Lp(a) concentrations in blacks as compared to whites, and confirm the notion that Lp(a) lipoprotein levels are race-dependent. Whether high values of Lp(a) play an atherogenic role in blacks remains to be established in further studies. PMID:3665103

Parra, H J; Luyéyé, I; Bouramoué, C; Demarquilly, C; Fruchart, J C

1987-09-15

224

Analysis And Localization of the Water-Deficit Stress-Induced Gene ( lp3 )  

Microsoft Academic Search

LP3 is a water-deficit-induced protein, which is highly homologous to ASR (ABA, stress and ripening) proteins. Homology was\\u000a found in the C-terminal region of the putative LP3 protein while lower homologies were found in the N-terminal region. The\\u000a goal of this study was to investigate the function of the LP3 protein and the mechanism of the lp3 promoter in response

Jau-Tay Wang; Jean H. Gould; Veera Padmanabhan; Ronald J. Newton

2002-01-01

225

Otogenic Pneumocephalus Associated with a Ventriculoperitoneal Shunt  

PubMed Central

Otogenic pneumocephalus is a condition of intracranial air originating from the middle ear or mastoid air cells. This communication between the intracranial cavity and the pneumatic cavities is usually associated with trauma after cranial fractures or iatrogenic trauma. We present a rare case of otogenic pneumocephalus arising in the left posterior fossa from wellpneumatized mastoid air cells. The patient complained of roaring tinnitus that developed 29 months after ventriculoperitoneal shunt insertion due to brain tumor surgery. High resolution computed tomography scan of the temporal bones revealed a large pneumocephalus below the left tentorium, and a bony dehiscent route was clearly identified in a sagittal view. A left mastoidectomy with preservation of the posterior wall of the external auditory canal was performed, and the expected bony dehiscent site was identified in the posterior fossa dura plate, just posterior to the posterior semicircular canal, below the Donaldson's line. This communication was sealed with a temporalis muscle plug from the deep temporalis muscle fascia and bone dust. Pneumocephalus may be caused by negative intracranial pressure in a patient with very well-pneumatized mastoid bone, and it can be a possible cause of 'wind-like' sound in the ear.

Kim, Young Hoon; Lee, Won Il; Park, Mi-Na; Choi, Hyun Seung; Kim, Na Hyun

2009-01-01

226

Improved quality of life after distal splenorenal shunt. A prospective comparison with side-to-side portacaval shunt.  

PubMed

The distal splenorenal shunt (DSRS) was compared with the side-to-side portacaval shunt (PCS) in 93 prospectively matched patients with portal hypertension. After 38 months mean follow-up the two shunts had a different incidence of acute encephalopathy (22% in PCS group and 33% in DSRS group) and chronic encephalopathy (35% in PCS group and 17% in DSRS group), but the difference was not statistically significant. However, the only cases of severe and disabling chronic encephalopathy arose after PCS (p = 0.049). Actuarial curves of chronic encephalopathy showed that the maximum rate of encephalopathy (18%) in the DSRS group was reached 27 months after shunt surgery, whereas this value was reached and passed in PCS group only 4 months after shunt. Chronic encephalopathy occurred for a total duration of 20.1 months after PCS and only 11.1 months afer DSRS (p = 0.003) and occupied 46.3% of the follow-p of PCS patients, as contrasted to 18.7% of the follow-up of DSRS patients (p = 0.0001). DSRS is associated with a lower global incidence of chronic HE without severe forms and provides a better quality of life than does a nonselective shunt. PMID:3389941

Spina, G; Santambrogio, R; Opocher, E; Galeotti, F; Cucchiaro, G; Strinna, M; Pezzuoli, G

1988-07-01

227

78 FR 53745 - Gulf South Pipeline Company, LP; Petal Gas Storage, L.L.C.; Gulf South Pipeline Company, LP...  

Federal Register 2010, 2011, 2012, 2013

...application may be directed to J. Kyle Stephens, Vice President of Regulatory Affairs, Boardwalk Pipeline Partners, LP, 9 Greenway Plaza, Houston, Texas, 77046; by fax 713-479- 1846 or email to kyle.stephens@bwpmlp.com. There are two ways...

2013-08-30

228

78 FR 14778 - Application to Export Electric Energy; Shell Energy North America (US), L.P.  

Federal Register 2010, 2011, 2012, 2013

...Shell Energy North America (US), L.P. AGENCY: Office of Electricity Delivery...Shell Energy North America (US), L.P. (Shell Energy) has applied to renew its...Shell Energy North America (US), L.P., 1000 Main, Level 12, Houston, TX...

2013-03-07

229

78 FR 14779 - Application to Export Electric Energy; Shell Energy North America (US), L.P.  

Federal Register 2010, 2011, 2012, 2013

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2013-03-07

230

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

Code of Federal Regulations, 2013 CFR

... 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...

2013-07-01

231

Laparoscopic treatment of abdominal complications following ventriculoperitoneal shunt  

PubMed Central

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.

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

2009-01-01

232

Temporary arterial shunts to maintain limb perfusion after arterial injury: an animal study  

NASA Technical Reports Server (NTRS)

BACKGROUND: Temporary shunt placement can quickly restore perfusion after extremity arterial injury. This study examined the adequacy of limb blood flow with shunt use, non-heparin-bonded shunt patency over prolonged periods, and the safety of this technique. METHODS: Common iliac arteries were divided and 4.0-mm Silastic Sundt shunts placed in 16 anesthetized pigs. Eight (group I) had shunts placed immediately; eight others (group II) were shunted after an hour of limb ischemia and hemorrhagic shock. Physiologic parameters and femoral artery blood flow in both hindlimbs were continuously monitored. Limb lactic acid generation, oxygen utilization, and hematologic and metabolic effects were serially evaluated for 24 hours. RESULTS: Shunts remained patent in 13 of 16 pigs. Shunts thrombosed in two group I animals because of technical errors, but functioned well after thrombectomy and repositioning. Patency could not be maintained in one animal that died from shock. Flow in group I shunted limbs was 57 (+/-11 SD) % of control. For group II animals in shock, shunted limb flow initially averaged 46 +/- 15% of control, but 4 hours after shunt placement, the mean limb blood flow was the same as in group I. Increased oxygen extraction compensated for the lower flow. Lactic acid production was not increased in comparison to control limbs. CONCLUSION: Shunts provided adequate flow in this model of extremity trauma. Correctly placed shunts stayed patent for 24 hours, without anticoagulation, if shunt placement followed resuscitation.

Dawson, D. L.; Putnam, A. T.; Light, J. T.; Ihnat, D. M.; Kissinger, D. P.; Rasmussen, T. E.; Bradley, D. V. Jr

1999-01-01

233

Cost of preventing variceal rebleeding with transjugular intrahepatic portal systemic shunt and distal splenorenal shunt  

PubMed Central

Background and aims We examined the cost and cost effectiveness of distal splenorenal shunt (DSRS) and transjugular intrahepatic portosystemic shunt (TIPS) in the prevention of variceal rebleeding. Subjects Participants in randomized controlled trial comparing DSRS to TIPS. Methods Quality of life (QOL) measured using SF-36 preceding randomization and yearly thereafter. Cost utility analysis was performed using Data Treeage ®. Costs for both in- and out-patient events and interventions were obtained for each patient. Costs using coated stents were estimated using different rates of stenosis. Incremental cost effectiveness ratios (ICERs) were determined at 1, 3 and 5 years. Results The average yearly costs of managing patients after TIPS and DSRS over 5 years were similar, $16,363 and $13,492 respectively. Cost of TIPS for surviving patients exceeded the cost of DSRS at years 3 and 5 but not significantly. ICERs per life saved favored TIPS at year 5 ($61,000). If coated rather than bare stents were used the cost-effectiveness of TIPS increased slightly. Conclusions TIPS is as effective as DSRS in preventing variceal rebleeding and may be more cost effective. TIPS, in all aspects, is equal to DSRS in the prevention of variceal rebleeding in patients who are medical failures.

Boyer, Thomas D; Henderson, J Michael; Heerey, Adrienne M; Arrigain, Susana; Konig, Vicky; Jason, Connor; Abu-Elmagd, Kareem; Galloway, John; Rikkers, Layton F; Jeffers, Lennox

2009-01-01

234

Comparisons Between a Hybrid Shunt Active Filter and a Pure Shunt Active Filter  

NASA Astrophysics Data System (ADS)

This paper deals with a hybrid shunt active filter for harmonic compensation of a three-phase diode rectifier in a 480-V adjustable-speed motor drive system. The hybrid filter is formed by a three-phase LC filter tuned around the 7-th harmonic frequency and a small-rated three-phase voltage-source PWM inverter. The LC filter and PWM inverter are directly connected in series. As a result, the dc capacitor voltage of the PWM inverter in the hybrid filter is much lower than that of a conventional pure shunt active filter. This results in higher efficiency, less switching ripple and less EMI emission. Computer simulation is carried out to compare the hybrid filter with the pure filter in terms of circuit configuration and filtering performance. Simulation results indicate that the hybrid filter is superior in effectiveness and viability to the pure filter. In addition, theoretical analysis based on vector loci confirms the validity of the simulation results.

Tamai, Yasuhiro; Srianthumrong, Sunt; Akagi, Hirofumi

235

Carotid Endarterectomy with Contralateral Carotid Occlusion: Is Shunting Necessary?  

PubMed Central

Background?Controversy exists about the effect of contralateral carotid stenosis on the perioperative risks of carotid endarterectomy (CEA). Despite increased perioperative risk, the long-term outcome is improved in patients who undergo ipsilateral CEA with significant contralateral carotid stenosis. Traditionally, this involved shunting the ipsilateral carotid artery during the procedure. It was believed that this minimized the risk for cerebral ischemia. We believe selective shunting can be employed while still avoiding cerebral ischemia. This requires a reliable method of monitoring for ischemia. Intraoperative EEG monitoring has been proven to be a reliable method for monitoring for ischemic changes during a case. Methods?A standard operative technique involving continuous EEG monitoring was used. We reviewed the records of carotid endarterectomies in the past 3 years. We present a series of 8 cases of CEA with contralateral occlusion in which shunting was selective based on EEG. Results?Of eight patients, seven (87.5%) tolerated the procedure without EEG changes and thus did not requiring intraluminal shunting. There were no long-term complications in our series of patients. Conclusion?We found that intraluminal carotid shunting during CEA with contralateral occlusion is not mandatory but neuroprotection methods need to be added to the operative procedure to ensure safety.

Ward, Austin; Ferraris, Victor; Saha, Sibu

2012-01-01

236

Fiber-optic bend sensor using LP21 mode operation.  

PubMed

A novel fiber-optic bending sensor based upon the propagation of LP21 mode is demonstrated. The sensor, comprised of an S-bend fiber on an elastic film, measures LP21 mode specklegram rotation, which increments linearly with bending angle by the stress-optic effect. The sensor is capable of experimentally achieving a sensitivity as high as 4.13 rad/m(-1). The theoretical analysis of the sensor, which is a combination of fiber coupled-mode theory and elastic-optic theory, validates the accuracy of the sensor. The sensor is also shown to be temperature-immune, and can detect both bending direction and bending angle with a large dynamic range. Furthermore, the sensor implementation incorporates inexpensive single-mode fiber at 650 nm for few-mode operation, enabling low-loss transmission and compatibility with existing interfaces. PMID:23187468

Fan, Yuqiang; Wu, George; Wei, Wanting; Yuan, Yufeng; Lin, Feng; Wu, X

2012-11-19

237

Lp-PLA 2 : A New Target for Statin Therapy  

Microsoft Academic Search

Inflammation plays an important role in atherogenesis and plaque vulnerability. Inflammatory-type markers have been evaluated\\u000a for their association with atherosclerotic vascular disease and their ability to improve cardiovascular disease (CVD) risk\\u000a stratification. Lipoprotein-associated phospholipase A2 (Lp-PLA2) is a vascular-specific inflammatory enzyme that increases the risk of CVD events and stroke approximately twofold. A consensus\\u000a panel recently recommended the measurement of

Lynne T. Braun; Michael H. Davidson

2010-01-01

238

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

PubMed

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

Cain, W S; Turk, A

1985-03-01

239

Peritoneovenous shunting for intractable chylous ascites complicated with lymphangioleiomyomatosis.  

PubMed

A 38-year-old woman was admitted due to lymphangioleiomyomatosis (LAM)-associated massive chylous ascites and progressive cachexia. She was incidentally diagnosed to have ascites during her regular physical check-up two years previously and LAM was revealed as its underlying cause. Periodic paracentesis was required to ameliorate ascites-associated symptoms, but resulted in lymphocytopenia, malnutrition, and deterioration of general status. Ascites was refractory to diuretics and fat-restricted diet. Peritoneovenous shunt (Denver shunt) was placed and thereafter ascites has been managed successfully without any complications for one year after the placement. Peritoneovenous shunt should be considered in LAM patients whose chylous ascites can not be managed with conservative treatments. PMID:18277030

Makino, Yuko; Shimanuki, Yuri; Fujiwara, Noriko; Morio, Yoshiteru; Sato, Koichi; Yoshimoto, Jiro; Gunji, Yoko; Suzuki, Tsutomu; Sasaki, Shin-ichi; Iwase, Akihiko; Kawasaki, Seiji; Takahashi, Kazuhisa; Seyama, Kuniaki

2008-01-01

240

Treatment of Hydrocephalus Associated with Neurosarcoidosis by Multiple Shunt Placement  

PubMed Central

A 31-year-old man was admitted to our hospital due to hydrocephalus with neurosarcoidosis. Ventriculo-peritoneal shunting was performed in the right lateral ventricle with intravenous methylprednisolone. Subsequently, after 4 months, additional ventriculo-peritoneal shunting in the left lateral ventricle was performed due to the enlarged left lateral ventricle and slit-like right lateral ventricle. After 6 months, he was re-admitted due to upward gaze palsy, and magnetic resonance image showed an isolated fourth ventricle with both the inlet and outlet of fourth ventricle obstructed by recurrent neurosarcoidosis. Owing to the difficulty of using an endoscope, we performed neuronavigator-guided ventriculo-peritoneal shunting via the left lateral transcerebellar approach for the treatment of the isolated fourth ventricle with intravenous methyl prednisolone. The patient was discharged with improved neurological status.

Kim, Sung Hoon; Sung, Soon Ki; Son, Dong Wuk

2012-01-01

241

Infantile Dural Arteriovenous Shunt Draining into a Developmental Venous Anomaly  

PubMed Central

Summary A three-year-old girl with an incidentally discovered infantile type of dural arteriovenous shunts (DAVs) along the superior sagittal sinus during investigation of a minor head trauma is presented. The DAVs drained into a developmental venous anomaly of the right cerebral hemisphere. In addition, there was a small cavernoma within the territory drained by the DVA. The patient underwent multiple transarterial embolizations to decrease the shunt flow and thus the constrained venous drainage of the DVA and right cerebral hemisphere. Pediatric dural arteriovenous shunts are a different entity from the adult type DAVs and should be managed according to the growth and development of the child. DVAs are extreme variations of the venous system with reduced flexibility to increased venous drainage. Regardless of the type of treatment employed, the DVA and its drainage pathway must be preserved.

Geibprasert, S.; Krings, T.; Pereira, V.; Lasjaunias, P.

2007-01-01

242

Predicting shunt currents in stacks of bipolar plate cells  

SciTech Connect

A method is presented for predicting shunt currents in stacks of undivided and divided bipolar plate cells. The method is an efficient way of solving the coupled sets of algebraic equations that arise from using circuit analog models to represent the current paths in stacks of undivided or divided bipolar plate cells. These algebraic equations can be either linear or nonlinear depending upon the current-potential relationships used in the model (i.e., nonlinear circuit elements can be included). The method is used to show the importance of including nonsymmetrical resistances and nonlinear circuit elements in the models. Also, the method is used to predict the shunt currents for a nine cell stack of pilot plant scale bipolar plate, membrane chlor-alkali cells. It is shown that these predictions agree qualitatively with measured values. Finally, the method is used to predict the shunt currents for stacks of 60 and 120 of these cells.

White, R.E.; Walton, C.W.; Burney, H.S.; Beaver, R.N.

1986-03-01

243

Endovascular occlusion of high-flow intracranial arteriovenous shunts: technical note  

PubMed Central

Endovascular closure of high-flow arteriovenous (AV) shunts in intracranial AV malformations or pial fistulas is technically challenging. In this paper, we illustrate two simple methods to occlude large high-flow AV shunts in a controlled manner.

Sluzewski, Menno

2007-01-01

244

Upward Migration of a Peritoneal Catheter Following Ventriculoperitoneal Shunt  

PubMed Central

We present an unusual case of peritoneal catheter migration following a ventriculoperitoneal shunt operation. A 7-month-old infant, who had suffered from intraventricular hemorrhage at birth, was shunted for progressive hydrocephalus. The peritoneal catheter, connected to an 'ultra small, low pressure valve system' (Strata®; PS Medical,Gola, CA, USA) at the subgaleal space, was placed into the peritoneal cavity about 30 cm in length. The patient returned to our hospital due to scalp swelling 21 days after the surgery. Simple X-ray images revealed total upward migration and coiling of the peritoneal catheter around the valve. Possible mechanisms leading to proximal upward migration of a peritoneal catheter are discussed.

Cho, Kyung Rae; Yeon, Je Young

2013-01-01

245

Endoscopic management of brainstem injury due to ventriculoperitoneal shunt placement  

Microsoft Academic Search

Introduction  We report a patient who suffered from brainstem injury following ventriculoperitoneal (VP) shunt placement in the fourth ventricle.\\u000a \\u000a \\u000a \\u000a Discussion  A 20-year-old man with complex hydrocephalus and trapped fourth ventricle underwent a subocciptal placement of a VP shunt.\\u000a Postprocedure patient developed double vision. Magnetic resonance imaging showed that the catheter was penetrating the dorsal\\u000a brainstem at the level of the pontomedullary junction.

J. Torrez-Corzo; R. Rodriguez-Della Vecchia; J. C. Chalita-Williams; L. Rangel-Castilla

2009-01-01

246

Dynamic actuation methods for capacitive MEMS shunt switches  

NASA Astrophysics Data System (ADS)

We develop dynamic actuation methods for capacitive MEMS shunt switches. We show that the dynamic actuation voltage is significantly less than the static actuation voltage and demonstrate 60% reduction in the actuation voltage. We also show that this reduction in the actuation voltage depends on the specific dynamic switching technique adopted. For a given operating condition, the minimum realizable switching time is that obtained using static switching. However, we developed a dynamic switching method that yields comparable switching time to that minimum. We also found that squeeze-film damping is the dominant damping mechanism for a shunt switch with a relatively slender bridge (aspect ratio of 11:1).

Khater, M. E.; Vummidi, K.; Abdel-Rahman, E. M.; Nayfeh, A. H.; Raman, S.

2011-03-01

247

A late complication of CSF shunting: acquired Chiari I malformation  

Microsoft Academic Search

Purpose  Acquired Chiari I malformation developing after cerebrospinal fluid (CSF) shunting is an intriguing late complication of CSF\\u000a shunt surgery and not only raises questions as to its pathogenesis but also poses many queries about the possible adverse\\u000a effects on the subsequent child development as well as on the indications and possibilities of surgical correction.\\u000a \\u000a \\u000a \\u000a Materials and methods  We report a series

Massimo Caldarelli; Federica Novegno; Concezio Di Rocco

2009-01-01

248

Infected pseudoaneurysm following a modified Blalock-Taussig shunt procedure.  

PubMed

A 3-year-old boy with pulmonary atresia with ventricular septal defect, who had undergone placement of a modified Blalock-Taussig shunt, presented with a 1-week history of high fever. Computed tomography showed a pseudoaneurysm at the anastomosis between the right brachiocephalic artery and the graft. After intravenous antibiotic therapy, the pseudoaneurysm and infected graft were resected through a median sternotomy. This report describes successful management of a potentially fatal complication following placement of a modified Blalock-Taussig shunt. PMID:24771741

Nakai, Yosuke; Nomura, Norikazu; Ukai, Tomohiko; Asano, Miki; Mishima, Akira

2014-05-01

249

Treatment of portosystemic shunt myelopathy with a stent graft deployed through a transjugular intrahepatic route.  

PubMed

A case of surgically created splenorenal shunt complicated with shunt myelopathy was successfully managed by placement of a stent graft within the splenic vein to close the portosystemic shunt and alleviate myelopathy. To our knowledge, this is the first report of a case of shunt myelopathy in a patient with noncirrhotic portal fibrosis without cirrhosis treated by a novel technique wherein a transjugular intrahepatic route was adopted to deploy the stent graft. PMID:22996588

Jain, Deepak; Arora, Ankur; Deka, Pranjal; Mukund, Amar; Bhatnagar, Shorav; Jindal, Deepti; Kumar, Niteen; Pamecha, Viniyendra

2013-08-01

250

CSF shunt infections in children: experiences from a population-based study  

Microsoft Academic Search

Summary.  \\u000a ?The objective was to identify risk factors for shunt infections, and establish the rate of infection for shunt procedures\\u000a carried out under standardized conditions in a well-defined population. All (407) paediatric shunt operations (primary and\\u000a revisions) performed within a total population of 630000 inhabitants between January 1, 1986 and December 31, 1996, were analysed\\u000a retrospectively. 11 shunt infections were

P. Ø. Enger; F. Svendsen; K. Wester

2003-01-01

251

Increased concentrations of serum Lp(a) lipoprotein in patients with primary gout.  

PubMed Central

OBJECTIVES--To investigate if serum Lp(a) lipoprotein (Lp(a)), a risk factor for atherosclerotic diseases, increases in patients with gout, who frequently also have atherosclerotic disease. METHODS--Fasting blood samples were taken for measurement of Lp(a) and other variables in 175 male patients with primary gout. Serum concentrations of Lp(a) were measured by enzyme linked immunosorbent assay. The median value and frequency distribution of Lp(a) in gout patients were compared with those in 172 control male subjects. In addition, we examined the effect of niceritorol on serum Lp(a) values in gout patients in whom the Lp(a) concentration was greater than 20 mg/dl. RESULTS--Serum Lp(a) was significantly higher in patients with gout than control subjects (median 15.5 mg/dl upsilon 8.6 mg/dl; p < 0.01). The frequency distribution of Lp(a) in gout was significantly shifted towards greater concentrations compared with control, although skewed distribution was noted in both groups. Serum Lp(a) concentration was not related to age, body mass index, alcohol intake, creatinine, fasting blood sugar or uric acid in patients with gout. Niceritorol decreased the serum concentrations of Lp(a) in gout. CONCLUSIONS--These observations suggest that serum Lp(a) concentrations are increased in patients with gout and may play a role as one of the risk factors for atherosclerotic diseases in gout. Niceritorol seems effective in decreasing high levels of Lp(a) in patients with gout without detrimental influence on serum uric acid concentration.

Takahashi, S; Yamamoto, T; Moriwaki, Y; Tsutsumi, Z; Higashino, K

1995-01-01

252

Intrathoracic Displacement of Pleuroamniotic Shunt after Successful in utero Treatment of Fetal Hydrops Secondary to Hydrothorax  

Microsoft Academic Search

Background: Primary fetal pleural effusion can be associated with high perinatal morbidity and mortality, especially when it is associated with the presence of fetal hydrops. Pleuroamniotic shunting results in effective drainage and lung expansion which prolong the pregnancy and improve neonatal survival. Intrathoracic displacement of the shunt is a rare but a known complication of shunt insertion and can cause

Fawaz Alkazaleh; Mohamed Saleem; Eman Badran

2009-01-01

253

Treatment of Staphylococcus epidermidis Ventriculo–Peritoneal Shunt Infection with Linezolid  

Microsoft Academic Search

Gram-positive bacterial meningitis frequently complicates ventriculo-peritoneal (VP) shunts used for hydrocephalus. Linezolid, an oxazolidinone, is active against Gram-positive cocci, and has excellent CSF penetration. We present a 22-year-old woman who was cured of a Staphylococcus epidermidis VP shunt infection via shunt removal and intravenous linezolid.

C. J. Gill; M. A. Murphy; D. H. Hamer

2002-01-01

254

Treatment of Occluded Distal Splenorenal Shunts with Endovascular Stents: A Report of Two Cases  

SciTech Connect

Surgical treatment of an occluded or stenotic portosystemic shunt is difficult and carries a high risk of mortality. We report two cases of early thrombosis of distal splenorenal shunt (DSRS) successfully treated by transcatheter recanalization and stent placement. At 18-month follow-up, the patients remained asymptomatic and control venograms showed continued patency of the shunt with no evidence of stenosis or collaterals.

Lopez-Medina, Antonio; Peiro, Javier; Gonzalez de Garay, Miguel [Department of Radiology, Hospital de Basurto, Avenida de Montevideo 18, Bilbao 48013, Vizcaya (Spain); Antonana, Miguel A. [Department of Radiology, Hospital de Cruces, Baracaldo 48903, Vizcaya (Spain); Sustacha, Jon [Department of Surgery, Hospital de Basurto, Avenida de Montevideo 18, Bilbao 48013, Vizcaya (Spain); Grande, Domingo [Department of Radiology, Hospital de Basurto, Avenida de Montevideo 18, Bilbao 48013, Vizcaya (Spain)

2001-05-15

255

ELIMINATING SHUNTS FROM INDUSTRIAL SILICON SOLAR CELLS BY SPATIALLY RESOLVED ANALYSIS  

Microsoft Academic Search

In this work a easy-to-use system was built and used for fast shunt analysis of Industrial silicon solar cells using liquid crystal thermal foils. With this method, shunt detection is possible trough the visualization of the local power dissipation under an external bias. Six main shunt types where identified. After a detailed characterization their causes could be partially overcome. The

S. A. Correia; J. Lossen; M. Bähr

256

Outcome Analysis of Initial Neonatal Shunts: Does the Valve Make a Difference?  

Microsoft Academic Search

Objective: Ventriculoperitoneal shunts have one of the highest complication rates of all neurosurgical procedures. The purpose of this study was to identify factors associated with malfunction of shunts placed in infants with neonatal hydrocephalus, with the goal of maximizing long-term shunt survival. Methods: We performed a retrospective chart review of 200 consecutive patients less than 1 year old who underwent

Shenandoah Robinson; Bruce A. Kaufman; T. S. Park

2002-01-01

257

The use of the ASET in the diagnosis of ventriculoatrial shunt infection  

PubMed Central

A 38-year-old man with a ventriculoatrial shunt presented with non-specific symptoms (headache, back pain, night sweats) and inconclusive laboratory results. He showed an extremely high titre of antibody to Staphylococcus epidermidis which proved diagnostic of shunt infection. This was confirmed on shunt removal and he was successfully treated.

Reaper, Jacqueline; Collins, Sally Ann; Bayston, Roger

2012-01-01

258

Clinical Experience with Carotid Stump Pressure and EEG Monitoring to Determine Shunt Placement During Carotid Endarterectomy  

PubMed Central

The authors' experience with selective shunting during carotid endarterectomy utilizing electroencephalographic and stump pressure measurements is reported. No postoperative neurological deficits occurred in this group of selectively shunted patients. EEG appeared to offer no significant benefit in the management of the patients. Carotid stump pressures alone were reliable in providing the basis for selective shunting.

Sweezer, William P.; Hayes, Dennis F.; Organ, Claude H.

1983-01-01

259

Design and test of a novel isolator with negative resistance electromagnetic shunt damping  

Microsoft Academic Search

This paper proposes a negative resistance electromagnetic shunt damping vibration isolator and investigates the effectiveness of the isolator. The isolator consists of a shunt circuit and a pair of electromagnet and permanent magnets that are pasted onto a box-shaped spring. A kind of negative resistance shunt impedance is proposed to cancel the inherent resistance of the electromagnet. The electromechanical coupling

Bo Yan; Xinong Zhang; Hongpan Niu

2012-01-01

260

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

Microsoft Academic Search

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.

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

2009-01-01

261

Performance test for transmitted noise reduction of smart panels using piezoelectric shunt damping  

Microsoft Academic Search

The performance for the transmitted noise reduction of smart panels is experimentally tested. A smart panel is a plate on which piezoelectric patches are bonded with electrical shunt circuits so as to absorb the acoustic energy at the circuit. Four piezoelectric patches are bonded on the host panel along with resonant shunt circuits. The resonant shunt circuit is composed of

Jaehwan Kim; Jin-Young Choi

2005-01-01

262

Experimental analysis of the benefits of shunted piezoceramics for damped and undamped structures  

Microsoft Academic Search

The application of electrically shunted piezoceramic materials (PZTs), commonly known as 'smart damping materials,' for reducing noise and vibrations in damped and undamped structures is examined, using a specially designed test stand. The 'smart damping' technique used in this study involves attaching PZTs that are shunted with electrical circuits, consisting of resistors, capacitors, and inductors. The shunted PZTs are simple,

Mehdi Ahmadian; Kristina M. Jeric; Daniel J. Inman

2001-01-01

263

ONLINE-TUNED MULTIMODE RESONANT PIEZOELECTRIC SHUNT FOR BROADBAND VIBRATION SUPPRESSION  

Microsoft Academic Search

Broadband structural vibration can be suppressed through the connection of an electrical impedance to the terminals of a bonded piezoelectric transducer. This is referred to as piezoelectric shunt damping. Good nominal damping performance has been obtained with resonant shunts, but these shunts are highly sensitive to variations in structural resonance frequencies. In this paper, we present an online tuned multi-mode

Dominik Niederberger; Andrew Fleming; S. O. Reza Moheimani; Manfred Morari

264

Dandy-Walker syndrome: posterior fossa craniectomy and cyst fenestration after several shunt revisions  

Microsoft Academic Search

Ventriculoperitoneal or cyst-peritoneal shunts are the usual treatment for children with Dandy-Walker syndrome. A combined ventricular and cyst shunt is often necessary and, in some cases, multiple revisions have to be done. Two patients with this syndrome were treated with posterior fossa exploration and cyst fenestration after several shunt revisions. The procedure was well tolerated with good results in both

G. M. Almeida; H. Matushita; L. C. Mattosinho-França; M. K. Shibata

1990-01-01

265

The Radiation Dose Accumulated by Blood Diverted Through a Shunt.  

National Technical Information Service (NTIS)

Modern techniques have made it possible to divert a portion of the circulating blood through a shunt outside the body--for example in heart-lung machines, artificial kidneys, and coiled tubes where the blood may be exposed to radiation without danger to b...

G. Marsaglia

1964-01-01

266

Intrauterine Shunt for Obstructive Hydrocephalus – Still Not Ready  

Microsoft Academic Search

Objective: To determine the safety and efficacy of ventriculoamniotic shunt placement through a hysterotomy in the second trimester of pregnancy as treatment for isolated obstructive hydrocephalus. Methods: Between 1999 and 2003, four pregnancies with isolated fetal obstructive hydrocephalus in the second trimester were treated at Vanderbilt University Medical Center. Preoperatively, all fetuses underwent serial ultrasonographic examinations and an ultrafast magnetic

Joseph P. Bruner; George Davis; Noel Tulipan

2006-01-01

267

Hydrocephalus and Shunts in the Person with Spina Bifida  

MedlinePLUS

... with the water on and a partially clogged drain, this fluid on the brain can’t drain fast enough. This fluid is made by special ... to insert a tube, called a shunt, to drain excess fluid from the head to another place ...

268

Four-Terminal Current Shunt with Calculable AC Response.  

National Technical Information Service (NTIS)

The design of a 0.1 Omega, four-terminal current shunt with calculable frequency dependence up to 1 MHz is described. It is intended for use as a standard for current measurements up to 10 A rms with the primary purpose of being able to tie alternating-cu...

O. B. Laug T. M. Souders B. C. Waltrip

2004-01-01

269

Solar cell Edge shunt isolation : A simplified approach  

Microsoft Academic Search

Edge shunts are among the main factors causing reduction in solar cell open circuit voltage that is why their isolation is one of the main steps in solar cell manufacturing. Many techniques have been employed to achieve this goal, e.g. plasma etching, grinding, wet etching, etc. Unfortunately, these methods have the disadvantages of being very expensive, single cell process and

I. M. Hamammu; K. Ibrahim

2007-01-01

270

Solar cell edge shunt isolation: a simplified approach  

Microsoft Academic Search

Edge shunts are among the main factors causing reduction in solar cell open circuit voltage that is why their isolation is one of the main steps in solar cell manufacturing. Many techniques have been employed to achieve this goal, e.g. plasma etching, grinding, wet etching, etc. Unfortunately, these methods have the disadvantages of being very expensive, single cell process and

I. M. Hamammu; K. Ibrahim

2002-01-01

271

Shunt choice in single right ventricle patients: an update.  

PubMed

Hypoplastic left heart syndrome, the most common complex congenital heart malformation, is characterized by underdeveloped left-sided heart structures. The Norwood procedure followed by two-staged operations has permitted the extended survival of many of these patients. Survival, however, remains suboptimal with most of the morbidity and mortality occurring during the Norwood procedure hospitalization. The modified Blalock-Taussig shunt has been implicated in contributing to the mortality risk due to decreased systemic diastolic blood pressure and coronary perfusion. Therefore, the right ventricle-to-pulmonary artery shunt was recently reevaluated as a lower-risk source of pulmonary blood flow in the Norwood procedure. The Pediatric Heart Network Single Ventricle Reconstruction trial, sponsored by the NIH National Heart, Lung and Blood Institute, evaluated the two types of shunts during the Norwood procedure. This randomized clinical trial has yielded important insight into the effects of shunt selection on morbidity, mortality, hemodynamics and overall current outcomes for hypoplastic left heart syndrome. PMID:24215198

Si, Ming-Sing; Pearson, Gail D; Ohye, Richard G

2013-12-01

272

Occlusion of modified Blalock-Taussig shunt after clopidogrel cessation.  

PubMed

It has been suggested previously that rebound hypercoagulability may be responsible for morbidity and mortality following clopidogrel cessation in adults with acute coronary syndrome. We report a case of acute occlusion of a modified Blalock-Taussig shunt in an infant after clopidogrel discontinuation. PMID:22269735

Avlonitis, Vassilios Spiridon; Planas, Silvia; Hayes, Alison M; Parry, Andrew

2012-02-01

273

Embolization of nonvariceal portosystemic collaterals in transjugular intrahepatic portosystemic shunts  

SciTech Connect

Percutaneous embolization of large portosystemic collaterals was performed in three patients following placement of a transjugular intrahepatic portosystemic shunt in order to improve hepatopetal portal flow. Improved hepatic portal perfusion was achieved in these cases, thereby theoretically reducing the risk of chronic hepatic encephalopathy.

Bilbao, Jose Ignacio; Arias, Mercedes; Longo, Jesus Maria; Alejandre, Pedro Luis [Universidad de Navarra, Department of Radiology, Clinica Universitaria, Facultad de Medicine (Spain); Betes, Maria Teresa [Universidad de Navarra, Department of Gastroenterology, Clinica Universitaria, Facultad de Medicina (Spain); Elizalde, Arlette Maria [Universidad de Navarra, Department of Radiology, Clinica Universitaria, Facultad de Medicine (Spain)

1997-03-15

274

Piezo shunt power flow optimization for composite beam stabilization  

NASA Astrophysics Data System (ADS)

Numerical and technological tools have been developed for complete electromechanical integration of innovative shunting damping strategies for piezoelectric composite beam stabilization to realize a new type of hybrid piezo-composite smart structure. The approach enhances the performance of fully passive configurations to control mechanical power flow in a beam by using negative capacitance elements. In contrast to passive shunted components that target discrete modes, negative capacitance shunted piezoelectric transducers offer the potential for broadband control from the low Hertz into the kilohertz range. This paper presents an original approach to tune vibration power flow dispersion in a piezocomposite beam to obtain total wave absorption by only optimizing the electrical circuit configuration shunting a single piezopatch. The numerical study considers the power flow efficiency of the strategy and the stability and robustness difficulties observed when a single device is considered. The simplicity of the proposed electromechanical controlling device affords the possibility to define and realize distributed configurations and also lends itself to integrated distributed smart composite structures.

Collet, Manuel; Cunefare, Kenneth A.; Beck, Benjamin

2008-05-01

275

Passive shunt damping of a piezoelectric stack nanopositioner  

Microsoft Academic Search

The speed and accuracy of nanopositioning systems is heavily influenced by the presence of lightly damped mechanical resonances. In this work, an electrical impedance is connected in series with the driving piezoelectric stack actuator to damp the first mechanical resonance. The electrical shunt is shown to act equivalently to an output feedback controller except that no sensor is required. A

Arnfinn Aas Eielsen; Andrew J. Fleming

2010-01-01

276

Suppression of common torsional mode interactions using shunt reactor controllers  

SciTech Connect

The paper presents the results of a study on the utilization of shunt reactors for the damping of common torsional mode interactions of a power system containing series-capacitor compensation. The IEEE Second Benchmark Model, system-2, which has two sets of nonidentical turbine-generators connected to an infinite bus via a common series--capacitor compensated transmission line, is employed to investigate the possible unstable Subsynchronous Resonance (SSR) modal interactions can be suppressed by using reactive power compensation. A set of shunt reactors are proposed and connected to the studied system and a unified approach based on modal control theory is employed to design shunt reactor controllers in order that all SSR modes in the system can be stabilized. For clearly demonstrating the effectiveness of the proposed scheme, SSR mode eigenvalues under different loading conditions and sensitivity analysis of shunt reactor controllers' parameters are performed. Dynamic responses of the nonlinear system simulation under a torque disturbance on generator shaft and a severe three-phase short-circuit fault at infinite bus are also carried out.

Li Wang; San Jan Mau; Chieh Chen Chuko (National Cheng Kung Univ., Tainan (Taiwan, Province of China). Dept. of Electrical Engineering)

1993-09-01

277

Stabilizing torsional oscillations using a shunt reactor controller  

SciTech Connect

This paper presents the results of a study on the application of shunt reactors for the damping of torsional oscillations that occur in a power system containing series-capacitor compensation. The IEEE Second Benchmark Model, system-1 is employed to investigate the benefits of the utilization of modulated reactive power in suppressing unstable SSR modal interactions. A set of shunt reactor is connected to the generator bus of the affected synchronous machine whose shaft is directly coupled to the turbine system of the benchmark model. In order to stabilize all the torsional modes, a unified approach based on modal control theory is proposed for the design of a shunt reactor controller, which is essentially a dynamic output compensator. For demonstrating the effectiveness of the damping enhanced by the proposed scheme, eigenvalue analysis for different loading conditions, and sensitivity analysis for controller parameters are performed. In addition, dynamic responses of the nonlinear system under a three-phase short-circuit fault at infinite bus are also carried out. It can be concluded from the simulation results that the proposed shunt reactor control scheme can effectively suppress the torsional oscillations.

Wang, L.; Lee, C.H. (Inst. of Electrical Engineering, National Cheng Kung Univ., Tainan 70101 (TW))

1991-09-01

278

Multimode piezoelectric shunt damping with a highly resonant impedance  

Microsoft Academic Search

This brief paper proposes a novel impedance structure for piezoelectric shunt damping. The impedance has a highly resonant nature and can be considered as a feedback controller applying a high gain at each resonance frequency of the base structure. Closed-loop stability of the system is proved and robustness properties of the associated controller are studied. Experimental results, demonstrating the effectiveness

S. O. R. Moheimani; S. Behrens

2004-01-01

279

Multimode piezoelectric shunt damping with a highly resonant impedance  

Microsoft Academic Search

This paper proposes a novel impedance structure for piezoelectric shunt damping. The impedance has a highly resonant nature and can be considered as a feedback controller applying a high gain at each resonance frequency of the base structure. Closed loop stability of the system is proved and robustness properties of the associated controller are studied. Experimental results, demonstrating the effectiveness

S. R. Moheimani; S. Behrens

2002-01-01

280

Posterior fossa problems in hydrocephalic children treated with shunts  

Microsoft Academic Search

Fourteen hydrocephalic children with functioning lateral ventricular shunts developed posterior fossa problems: posterior fossa cyst (7 patients); isolated fourth ventricle (6 patients), and concomitant dilatation of third and fourth ventricles (1 patient). Posterior fossa symptoms were present in only 2 children; 10 had nonspecific symptoms and 2 were asymptomatic. Computed tomography was the most useful investigation for diagnosis and management.

D. H. Parikh; P. K. H. Tam; H. Carty; R. E. Cudmore

1991-01-01

281

Congenital multiple intrahepatic portosystemic shunt: an autopsy case  

PubMed Central

Multiple intrahepatic portosystemic shunt (IPSS) without portal hypertension, now thought to be congenital in origin, is very rare. The presence of IPSS, unlike other congenital diseases, may not be recognized for several decades due to the time it takes to develop hepatic encephalopathy. In this article, we report an autopsy case of an 80-year-old Japanese woman with a one-month history of hyperammonemic encephalopathy. Radiological examination of the liver revealed some abnormal connections between the branches of the portal veins and the hepatic veins, but the cause of the aberrant blood flow was not found. The cause of death was extensive cerebral infarction due to thromboembolism. At postmortem examination, multiple anomalous blood vessels were identified histologically in both lobes of the non-cirrhotic liver. In comparison with the few similar cases existing in the literature, this case should be diagnosed as congenital IPSS. To our knowledge, this is the first detailed histological study of IPSS, as several autopsy case reports exist but their histological descriptions are poor. Unlike past reports, the shunt vessels were accompanied by clear elastic lamellae that were microscopically observed. In addition to shunt vessels, septal fibrosis, disorder of hepatic acinar structure, and sinusoidal dilatation and capillarization were observed in the liver. We suggest that these histological modifications observed in the circumference of the shunt vessels acted as secondary regenerative/hyperplastic changes based on blood-flow imbalance caused by the IPSS.

Takahashi, Seishiro; Yoshida, Eriko; Sakanishi, Yasushi; Tohyama, Norihiro; Ayhan, Ayse; Ogawa, Hiroshi

2014-01-01

282

Predicting shunt currents in stacks of bipolar plate cells  

Microsoft Academic Search

A method is presented for predicting shunt currents in stacks of undivided and divided bipolar plate cells. The method is an efficient way of solving the coupled sets of algebraic equations that arise from using circuit analog models to represent the current paths in stacks of undivided or divided bipolar plate cells. These algebraic equations can be either linear or

R. E. White; C. W. Walton; H. S. Burney; R. N. Beaver

1986-01-01

283

Arterioportal Shunts in Cirrhotic Patients: Evaluation of the Difference Between Tumorous and Nontumorous Arterioportal Shunts on MR Imaging with Superparamagnetic Iron Oxide  

Microsoft Academic Search

OBJECTIVE . The study objective was to distinguish between the features of tumorous and nontumorous arterioportal shunts on superparamagnetic iron oxide-enhanced MR imag- ing in patients with cirrhosis. SUBJECTS AND METHODS . Ten arterioportal shunts in eight patients, including four tumorous and six nontumorous arterioportal shunts, were evaluated on T2-weighted turbo spin-echo and T2*-weighted gradient-echo sequences before and after administration

Kensaku Mori; Hiroshi Yoshioka; Yuji Itai; Yoshikazu Okamoto; Harushi Mori; Nobuyuki Takahashi; Yukihisa Saida

284

Hepatic osteodystrophy in rats results mainly from portasystemic shunting  

PubMed Central

Background and aims: In chronic liver disease, bone disease frequently develops. The contributions of the different features of liver disease such as parenchymal inflammation, portal hypertension, and portasystemic shunting on bone metabolism have not been systematically studied. The aim of this study was to identify the features of liver disease contributing to bone disease using rat models. Methods: Parenchymal liver disease was induced by carbon tetrachloride administration, portal hypertension by partial portal vein ligation, and portasystemic shunting by end to side anastomosis of the portal vein to the inferior vena cava. Normal and sham operated surgical animals served as controls. Serum calcium, 25-hydroxy vitamin D (25-OH vit D), and osteocalcin levels, and urinary deoxypyridinoline excretion were analysed. Testosterone and oestradiol levels were determined in male and female rats, respectively. Interleukin 1, interleukin 6, and tumour necrosis factor ? (TNF-?) were determined in serum. Bone density was measured in all groups and in addition, in the surgical groups, histomorphometry was performed on undecalcified specimens of the proximal tibia. The calcium content of the femurs, removed at termination and ashed, was determined. Results: Early parenchymal disease and portal hypertension did not affect bone metabolism or body mass. Portasystemic shunting increased bone resorption, decreased bone formation, bone density, and trabecular bone volume which were commensurate with a reduction in body mass. TNF-? levels were elevated and testosterone levels were low in male portasystemic shunted rats. Conclusions: Portasystemic shunting in the rat adversely affects bone metabolism as part of a generalised catabolic state where high TNF-? and low testosterone and 25-OH vit D levels may play a role.

van der Merwe, S W; van den Bogaerde, J B; Goosen, C; Maree, F F; Milner, R J; Schnitzler, C M; Biscardi, A; Mesquita, J M; Engelbrecht, G; Kahn, D; Fevery, J

2003-01-01

285

Expression of adhesion molecules by Lp(a): a potential novel mechanism for its atherogenicity  

Microsoft Academic Search

Lp(a) is a major inherited risk factor for premature atherosclerosis. The mechanism of Lp(a) atherogenicity has not been elucidated, but likely involves both its ability to interfere with plas- minogen activation and its atherogenic potential as a lipoprotein particle after receptor-mediated uptake. We demonstrate that Lp(a) stimulates production of vascular cell adhesion molecule 1 (VCAM-1) and E- selectin in cultured

SEAN ALLEN; SHABEENA KHAN; SHUI-PANG TAM; MARLYS KOSCHINSKY; PATRICIA TAYLOR; MAGDI YACOUB

286

Reduction of Cholesterol and Lp(a) in Regression of Coronary Artery Disease: A Case Study  

Microsoft Academic Search

Data in the literature suggests that elevated Lp(a) contributes to coronary artery disease. This case study documents the use of ascorbic acid, amino acids lysine and proline, an ayurvedic herb gum guggulu, pure crystaline niacin , and guar gum in lowering Lp(a). These natural substances were well tolerated and each lowered Lp(a) significantly. In this study (32 months duration) one

E. A. Katz

287

Enhanced Expression of Lp-PLA2 and Lysophosphatidylcholine in Symptomatic Carotid Atherosclerotic Plaques  

Microsoft Academic Search

Background and Purpose—Circulating lipoprotein-associated phospholipase A2 (Lp-PLA2) has emerged as a novel biomarker for cardiovascular diseases. However, the correlation between the plaque expression of Lp-PLA2 and plaque oxidative stress, inflammation, and stability as well as the clinical presentation remains poorly defined, especially for cerebrovascular disease. Therefore, this study was performed to test the hypothesis that Lp-PLA2 expression is higher in

Dallit Mannheim; Joerg Herrmann; Daniele Versari; Mario Gossl; Fredric B. Meyer; Joseph P. McConnell; Lilach O. Lerman; Amir Lerman

2009-01-01

288

LpA-I levels do not reflect pre ?1HDL levels in human plasma  

Microsoft Academic Search

High-density lipoprotein (HDL) containing apo A-I but no apo A-II (LpA-I) can promote cholesterol efflux from cells, while HDL containing apo A-I and apo A-II can not. Pre?1-HDL, a minor fraction of LpA-I, is the initial acceptor of cellular cholesterol. To determine whether the pre?1-HDL:LpA-I ratio is constant in human plasma, we measured LpA-I levels by differential electroimmunoassay, and HDL

Takashi Miida; Koichi Inano; Toshio Yamaguchi; Takashi Tsuda; Masahiko Okada

1997-01-01

289

LP/WLP Hybrid Scheme for Quality Improvement of TCX Coders Operating at Low Bit Rates  

NASA Astrophysics Data System (ADS)

In this paper, we propose a switchable linear prediction (LP)/warped linear prediction (WLP) hybrid scheme for the transform coded excitation (TCX) coder, which is adopted as a core codec in AMR-WB+ and USAC. The proposed algorithm selects either an LP or WLP filter on a per-frame basis. To provide a smooth transitions between LP and WLP frames, a window switching scheme is developed using sine and rectangular windows. In addition, a Gaussian Mixture Model (GMM)-based classification module is used to determine the prediction mode. Through a subjective listening test it was confirmed that the proposed LP/WLP switching scheme offers improved sound quality.

Lee, Tung-Chin; Park, Young-Cheol; Youn, Dae-Hee

290

Management of surgical splenorenal shunt-related hepatic myelopathy with endovascular interventional techniques  

PubMed Central

We present a case with hepatic myelopathy (HM) due to a surgical splenorenal shunt that was successfully treated by endovascular interventional techniques. A 39-year-old man presented with progressive spastic paraparesis of his lower limbs 14 mo after a splenorenal shunt. A portal venogram identified a widened patent splenorenal shunt. We used an occlusion balloon catheter initially to occlude the shunt. Further monitoring of the patient revealed a decrease in his serum ammonia level and an improvement in leg strength. We then used an Amplatzer vascular plug (AVP) to enable closure of the shunt. During the follow up period of 7 mo, the patient experienced significant clinical improvement and normalization of blood ammonia, without any complications. Occlusion of a surgically created splenorenal shunt with AVP represents an alternative therapy to surgery or coil embolization that can help to relieve shunt-induced HM symptoms.

Wang, Mao-Qiang; Liu, Feng-Yong; Duan, Feng

2012-01-01

291

Computed Tomography Angiography Successfully Used to Diagnose Postoperative Systemic-Pulmonary Artery Shunt Narrowing  

PubMed Central

In recent years, there has been a marked reduction in surgical mortality for many complex forms of congenital heart disease. Treatment or palliative strategies vary but may include systemic-pulmonary central or Blalock-Taussig shunt. These shunts can be complicated by overcirculation, infection, thrombosis, and thromboembolism. Many diagnostic modalities are available to aide in diagnosis of postoperative shunt complications including echocardiography and cardiac catheterization but these may be invasive, inconclusive, or difficult to obtain adequate images. Computed tomography angiography (CTA) has many attributes that make it potentially useful in the evaluation of congenital heart disease and postoperative shunt complications. We report one patient where CTA guided the post-operative algorithm and appropriately identified a shunt narrowing despite repeated echocardiograms showing a patent shunt. These findings along with clinical suspicion appropriately guided us toward cardiac catheterization. To our knowledge, this is the first paper where CTA appropriately suspected a shunt narrowing in the absence of echocardiographic confirmation.

Piggott, Kurt D.; Nykanen, David G.; Smith, Susan

2011-01-01

292

Sidewall shunted overdamped NbN-MgO-NbN Josephson junctions  

NASA Astrophysics Data System (ADS)

A sidewall shunting method is demonstrated to realize overdamped (i.e., nonhysteretic) current-voltage (IV) characteristics in superconductor-insulator-superconductor (SIS) junctions. Unlike the conventional layout of shunted SIS junctions, patterning a normal metal shunt on one of the sides of the junction considerably reduces the parasitic inductive path and leaves more area on a chip for active components. Using a conventional optical lithography route we have fabricated sidewall shunted SIS junctions of various sizes from NbN-MgO-NbN trilayers on MgO and oxidized Si substrates. In our experiment the effective shunting resistance is realized by a tunnel contact between the shunt metal and the base electrode via a thin layer of insulating MgO. The results of our electrical measurements verify the overdamped nature of the junctions shunted in this manner.

Senapati, K.; Barber, Z. H.

2009-04-01

293

Recanalisation of an occluded modified Blalock-Taussig shunt by balloon dilatation.  

PubMed Central

A four year old boy with pulmonary atresia and ventricular septal defect had an acute cyanotic episode three years after undergoing a right-sided, 6 mm diameter, modified Blalock-Taussig shunt. On admission no continuous murmur could be heard from the shunt and the typical high velocity, continuous flow profile of the shunt could not be identified by Doppler echocardiography. At catheterisation a right subclavian artery angiogram confirmed shunt occlusion. From the subclavian artery, an 0.035 inch wire was used to enter the occluded shunt and then the pulmonary artery. Balloon angioplasty of the entire length of the shunt was performed with 6 mm diameter balloon. After angioplasty the arterial oxygen saturation increased from 63% to 83%. The patient was treated with intravenous heparin followed by warfarin. Repeat catheterisation and angiography eight days later confirmed wide patency of the shunt. Images

Sreeram, N; Walsh, K; Peart, I

1993-01-01

294

Transient binocular visual loss: a rare presentation of ventriculoperitoneal shunt malfunction  

PubMed Central

The authors report the case of a 27-year-old male with ventriculoperitoneal shunt (VPS) for hydrocephalus presenting with episodic transient binocular visual loss (TBVL) and headache. Complete physical, bedside shunt examination and funduscopy were unremarkable. Laboratory investigation, shunt series and imaging studies failed to reveal any acute abnormalities. Interrogation of the shunt system identified a valve malfunction which was corrected with resultant symptomatic relief and the patient was discharged home in stable condition. VPS malfunction occurs secondary to infection or mechanical failure such as obstruction, tubing fracture, shunt migration and over drainage. Resultant raised intracranial pressure leads to symptoms of headache, nausea, vomiting and gait abnormalities. Visual defects including blindness has been occasionally reported from shunt malfunction. Rare complications include cerebrospinal fluid oedema, colonic perforation, paraparesis and parkinsonism. TBVL due to shunt malfunction remains an uncommon presentation and requires a high index of clinical suspicion while evaluating these patients.

Sunil, Meena; Payne, Catherine; Panda, Mukta

2011-01-01

295

Systemic-pulmonary artery shunts in infants: modified Blalock-Taussig and central shunt procedures.  

PubMed

Access is gained through a midline sternotomy, the thymus partially excised and the superior part of the pericardium is opened. The innominate vein is retracted and the innominate artery is mobilized up to the bifurcation. The aorta is retracted to the left, the superior vena cavae to the right and the right atrial appendage inferiorly. The adventitia around the right pulmonary artery (PA) is dissected, taking care to incise the bulky pericardial reflection between the superior vena cavae and the trachea. Heparin is administrated. An occlusive clamp is applied to the right PA to test for haemodynamic tolerance prior to proceeding with the interposition of a suitable size artificial vascular prosthesis, based on the weight of the patient, between the innominate artery, or proximal subclavian artery and the right PA. Alternatively, if a sufficient main PA is present and adequate flow from a patent ductus arteriosus an end-to-side interposition shunt may be constructed between the ascending aorta and the main PA, provided the patient is stable with the test occlusion of the main PA. The management of the patent arterial ductus depends on whether or not there is forward flow through the PA. PMID:24941030

Brooks, Andre

2014-06-01

296

Should ventriculoatrial shunting be the procedure of choice for normal-pressure hydrocephalus?  

PubMed

Object Ventriculoatrial (VA) shunting is rarely used for patients with normal-pressure hydrocephalus (NPH), likely due to surgeon technical preference and case reports indicating cardiopulmonary complications. However, these complications have typically been limited to adults in whom VA shunts had been placed when they were children. Few studies have directly compared VA shunting to ventriculoperitoneal (VP) shunting in cases of NPH. Methods The authors retrospectively analyzed all NPH patients treated by a single surgeon at their center from January 2002 through December 2011. Thirty patients were treated with VA shunts (14 male) and 157 with VP shunts (86 male). The patients' mean age (± SD) at surgery was 73.7 ± 9.4 years for VA shunting and 76.0 ± 8.2 years for VP shunting; the median durations of follow-up were 42.0 months (IQR 19.2-63.6 months) and 34.2 months (IQR 15.8-67.5), respectively. Statistical analysis was performed using chi-square tests and Wilcoxon rank-sum tests. Results Perioperative and postoperative complications for VA and VP shunting cohorts, respectively, included distal revision (2.7% vs 6.6%, p = 0.45), proximal revision (2.7% vs 2.5%, p = 0.97), and postoperative seizure (2.7% vs 1.5%, p = 0.62). Shunt drainage-related subdural hematomas/hygromas developed in 8.1%/27.0% of VA shunt-treated patients versus 6.6%/26.4% of VP shunt-treated patients (p = 0.76/0.98) and were nearly always successfully managed with programmable-valve adjustment. Symptomatic intracerebral hemorrhage (1.5%) and shunt infection (2.0%) were only observed in those who underwent VP shunting. Of note, no cardiovascular complications were observed in any patient, and there were no cases of distal occlusion of the VA shunt. Conclusions The authors found no significant differences in complication rates between VA and VP shunting, and VA shunting was not associated with any cardiopulmonary complications. Thus, in the authors' experience, VA shunting is at least as safe as VP shunting for treating NPH. PMID:24605842

McGovern, Robert A; Kelly, Kathleen M; Chan, Andrew K; Morrissey, Nicholas J; McKhann, Guy M

2014-06-01

297

Sib-pair analysis detects elevated Lp(a) levels and large variation of Lp(a) concentration in subjects with familial defective ApoB.  

PubMed Central

Whether or not Lp(a) plasma levels are affected by the apoB R3500Q mutation, which causes Familial Defective apoB (FDB), is still a matter of debate. We have analyzed 300 family members of 13 unrelated Dutch index patients for the apoB mutation and the apolipoprotein(a) [apo(a)] genotype. Total cholesterol, LDL-cholesterol, and lipoprotein(a) [Lp(a)] concentrations were determined in 85 FDB heterozygotes and 106 non-FDB relatives. Mean LDL levels were significantly elevated in FDB subjects compared to non-FDB relatives (P < 0.001). Median Lp(a) levels were not different between FDB subjects and their non-FDB relatives. In contrast, sib-pair analysis demonstrated a significant effect of the FDB status on Lp(a) levels. In sib pairs identical by descent for apo(a) alleles but discordant for the FDB mutation (n = 11) each sib with FDB had a higher Lp(a) level than the corresponding non-FDB sib. Further, all possible sib pairs (n = 105) were grouped into three categories according to the absence/presence of the apoB R3500Q mutation in one or both subjects of a sib pair. The variability of differences in Lp(a) levels within the sib pairs increased with the number (0, 1, and 2) of FDB subjects present in the sib pair. This suggests that the FDB status increases Lp(a) level and variability, and that apoB may be a variability gene for Lp(a) levels in plasma.

van der Hoek, Y. Y.; Lingenhel, A.; Kraft, H. G.; Defesche, J. C.; Kastelein, J. J.; Utermann, G.

1997-01-01

298

Cerebral venous thrombosis after ventriculoperitoneal shunting: a case report.  

PubMed

Ventriculoperitoneal shunting (VPS) is a simple procedure, but there are several potential complications. We describe the first reported case of cerebral venous thrombosis (CVT) after VPS. A 69-year-old man suffering from normal pressure hydrocephalus underwent left VPS. Two months later he developed CVT and cerebral venous hemorrhage in the left frontal lobe. Computed tomography (CT) and magnetic resonance imaging (MRI) revealed the thrombus formation just adjacent to the shunt tube. One possible cause is compression of the cortical vein after brain shift and/or tension of the cortical vein due to intracranial hypotension. A protein C deficiency was also detected. Surgeons should be aware that cerebral venous thrombosis can occur after VPS. PMID:24257484

Matsubara, Teppei; Ayuzawa, Satoshi; Aoki, Tsukasa; Ikeda, Go; Shiigai, Masanari; Matsumura, Akira

2014-07-15

299

The use and misuse of transjugular intrahepatic portasystemic shunts.  

PubMed

Transjugular intrahepatic portasystemic shunts, or TIPS, are used to create a low-resistance channel between the hepatic vein and the intrahepatic portion of the portal vein by deployment of an expandable metal stent. TIPS function like side-to-side surgical portacaval shunts, but their placement does not require anesthesia and major surgery. This article reviews the uses and misuses of TIPS in current practice. The uses include variceal hemorrhage and ascites as well as miscellaneous indications such as Budd-Chiari syndrome, veno-occlusive disease, bleeding ectopic and rectal varices, hepatic hydrothorax, and portal hypertensive gastropathy. TIPS is not indicated for primary prophylaxis of variceal hemorrhage, prehepatic portal hypertension, correction of hypersplenism and thrombocytopenia, pulmonary hypertension and hepatopulmonary syndrome, and portal hypertension associated with polycystic liver disease or Caroli's disease. Also reviewed herein is the management of patients after TIPS placement. PMID:10981005

Sanyal, A J

2000-02-01

300

Unilateral shunt formation with thoracic aortic dissection in a whippet.  

PubMed

A three-year-old neutered male whippet was presented with intermittent, exercise-induced paraparesis. Femoral pulses were bilaterally absent. Neurologic examination was suggestive of a thoracolumbar myelopathy. Blood pressure measurements revealed hypotension in both pelvic limbs, hypertension in the right thoracic limb and it was immeasurable in the left thoracic limb. Echocardiography was within reference limits. A clear vascular pulsation was palpable on the right ventral abdominal wall. Computed tomographic angiography revealed a dissection of the aortic wall between the left subclavian artery and the brachiocephalic trunk with subsequent thrombus formation. A shunt between the right internal thoracic, cranial and caudal epigastric arteries to preserve blood flow to the pelvic limbs was visualized. Necropsy was declined by the owner. This is the first case report describing the formation of a unilateral vascular shunt following a thoracic aortic occlusion, which presented as exercise-induced paraparesis. PMID:24602076

Cornelis, I; Bosmans, T; Doom, M; Binst, D; Van der Vekens, E; Kromhout, K; Cornillie, P; Van Ham, L

2014-06-01

301

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

PubMed

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

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

1998-04-27

302

77 FR 13593 - PowerSmith Cogeneration Project, LP; Notice of Request for Waiver  

Federal Register 2010, 2011, 2012, 2013

...EL12-37-000; QF86-36-006] PowerSmith Cogeneration Project, LP; Notice of Request for...18 CFR 292.205(c), PowerSmith Cogeneration Project, LP (PowerSmith) filed a...Regulations for the topping- cycle cogeneration facility owned and operated by...

2012-03-07

303

76 FR 4648 - PowerSmith Cogeneration Project, LP; Notice of Filing  

Federal Register 2010, 2011, 2012, 2013

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2011-01-26

304

76 FR 35070 - Canexus Chemicals Canada L.P. v. BNSF Railway Company  

Federal Register 2010, 2011, 2012, 2013

...FD 35524] Canexus Chemicals Canada L.P. v. BNSF Railway Company AGENCY: Surface...be held Thursday, June 23, 2011, at 2 p.m., or at a later time that afternoon...INFORMATION: Canexus Chemicals Canada L.P. (Canexus) has filed a complaint...

2011-06-15

305

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

Federal Register 2010, 2011, 2012, 2013

...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...

2011-05-13

306

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

Federal Register 2010, 2011, 2012, 2013

...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...

2013-05-06

307

Analysis of vector LP modes in VCSELs using the effective frequency method  

Microsoft Academic Search

The effective frequency method (EFM) is generalized to the case of vector analysis of LP modes in VCSELs and applied to proton-implanted and oxide-confined VCSEL structures. Resonant wavelengths and mode profiles of a number of vector LP modes are calculated for different values of active region radius. The vector EFM is shown to provide important information about the vertical and

Gennady A. Smolyakov; Peter G. Eliseev; Marek Osinski

2001-01-01

308

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

Federal Register 2010, 2011, 2012, 2013

...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,...

2011-03-04

309

Calling the LP-Solve Linear Program Software From Excel, S-Plus and R.  

National Technical Information Service (NTIS)

We present software that allows Excel, S-Plus and R to call the functions in the lp(underline)solve system. Lp(underline)solve is free software (licensed under the Gnu Lesser GPL) that solves linear and mixed-integer linear programs of moderate size (on t...

S. E. Buttrey

2003-01-01

310

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

Federal Register 2010, 2011, 2012, 2013

...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...

2013-11-29

311

78 FR 34089 - Jordan Cove Energy Project, L.P.; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...Docket Nos. CP13-483-000; PF12-7-000] Jordan Cove Energy Project, L.P.; Notice of Application Take notice that on May 21, 2013, Jordan Cove Energy Project, L.P. (Jordan Cove), 125 Central Avenue, Suite 380,...

2013-06-06

312

EDS Coal Liquefaction Process Development: Phase IIIA. EDS Process Alternatives LP Model. Interim Report.  

National Technical Information Service (NTIS)

This is an Interim Report on the development of the EDS Process Alternatives LP Model (PAM). PAM is a computerized linear programming (LP) Model of the EDS Coal Liquefaction process. The model was developed for use in process engineering and cost evaluati...

B. T. Fant

1978-01-01

313

75 FR 22125 - Trans-Union Interstate Pipeline, L.P.; Notice of Filing  

Federal Register 2010, 2011, 2012, 2013

...Energy Regulatory Commission [Docket No. AC10-73-000] Trans-Union Interstate Pipeline, L.P.; Notice of Filing April 20, 2010. Take notice that on April 9, 2010 Trans-Union Interstate Pipeline, L.P. submitted a request...

2010-04-27

314

76 FR 28221 - Trans-Union Interstate Pipeline, L.P.; Notice of Filing  

Federal Register 2010, 2011, 2012, 2013

...ENERGY Federal Energy Regulatory Commission [Docket No. AC11-52-000] Trans-Union Interstate Pipeline, L.P.; Notice of Filing Take notice that on April 7, 2011 Trans-Union Interstate Pipeline, L.P. submitted a request for a...

2011-05-16

315

77 FR 3762 - Magellan Pipeline Company, L.P.; Notice of Petition for Declaratory Order  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. OR12-7-000] Magellan Pipeline Company, L.P.; Notice of Petition...Procedure, 18 CFR 385.207(a)(2)(2011), Magellan Pipeline Company, L.P. (Magellan) filed a petition for a declaratory...

2012-01-25

316

75 FR 5074 - Oleander Power Project, LP; Southern Company-Florida LLC; Notice of Filing  

Federal Register 2010, 2011, 2012, 2013

...Commission [Docket Nos. ER00-3240-016; ER01-1633-013] Oleander Power Project, LP; Southern Company-Florida LLC; Notice...January 22, 2010. Take notice that on January 14, 2010, Oleander Power Project, LP and Southern Company-Florida LLC...

2010-02-01

317

Further experience with peritoneo-venous shunt for ascites.  

PubMed Central

A specially devised pressure-sensitive valve forms the basis for a new peritoneo-venous shunt operation which delivers ascitic fluid continuously into the venous system. It is effective in ascites attributed to different causes. The procedure is simple and brings a long lasting relief with recovery in strength and nutrition and improved kidney function. Hepatorenal syndrome in ascites is reversed. Images Fig. 6.

LeVeen, H H; Wapnick, S; Grosberg, S; Kinney, M J

1976-01-01

318

Slit ventricles as a cause of isolated ventricles after shunting  

Microsoft Academic Search

In a follow-up study of 164 hydrocephalic children without tumors treated with ventriculoperitoneal shunts, 46 (28.0%) developed slit ventricles, 5 (3.0%) developed isolated fourth ventricles, and 4 (2.4%) developed isolated unilateral hydrocephalus. All of the patients with isolated unilateral hydrocephalus and 3 with isolated fourth ventricles had associated slit ventricles, 2 of whom had enlarged ventricles as double-compartment hydrocephalus. Reopening

Shizuo Oi; Satoshi Matsumoto

1985-01-01

319

High Isolation CPW MEMS Shunt Switches Part 1: Modeling  

Microsoft Academic Search

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

Jeremy B. Muldavin; Gabriel M. Rebeiz

1999-01-01

320

High-isolation CPW MEMS shunt switches. 1. Modeling  

Microsoft Academic Search

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

Jeremy B. Muldavin; Gabriel M. Rebeiz

2000-01-01

321

Modernisation Issues of Diesel-Electric Shunting Locomotive Power Units  

NASA Astrophysics Data System (ADS)

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.

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

2010-01-01

322

Congenital Portosystemic Shunts and AMPLATZER Vascular Plug Occlusion in Newborns  

Microsoft Academic Search

Congenital portosystemic shunts (CPSs) may cause myriad manifestations. They can be detected prenatally, in infancy, or later.\\u000a They may involute, cause acute symptoms, or remain unrecognized and cause chronic disease. As CPSs can require treatment,\\u000a early diagnosis allows close monitoring. In symptomatic patients, interventional catheterization embolization of CPSs can\\u000a be undertaken at any age.

William N. Evans; Alvaro Galindo; Ruben J. Acherman; Abraham Rothman; Dean P. Berthoty

2009-01-01

323

A unique multipurpose damping circuit for shunt capacitor bank switching  

SciTech Connect

Considerations on disturbances related to Shunt Capacitor Bank (SCB) switching are summarized and a unique damping circuit able to cope with all of them is proposed. This damping circuit consists of a reactor in parallel with a resistor which is in series with a Metal Oxide Varistor (MOV), the latter being used to switch on the resistor only during transients. The design parameter of this damping circuit are described and the main tests performed are presented.

Sabot, A.; Morin, C.; Guillaume, C.; Pons, A. (Electricite de France, Les Renardieres (France). Les Renardieres Lab.); Taisne, J.P. (Electricite de France, Les Renardieres (France). Transmission Division); Pizzo, G.L.; Morf, H.U. (Haefely S.A., Saint Louis (France))

1993-07-01

324

Structural Vibration Control via RL Shunted Active Fiber Composites  

Microsoft Academic Search

This article presents a successful extension of passive R-L shunt damping to piezoelectric ceramic elements working in direct 3-3 mode and a performance comparison to elements working in indirect 3-1 mode. A new circuit topology is implemented to synthesize the very large inductances required by the low inherent piezoelectric device capacitance at relatively low frequencies. This allows for efficient tuning

Alberto Belloli; Dominik Niederberger; Stanislaw Pietrzko; Manfred Morari; Paolo Ermanni

2007-01-01

325

Vibration Damping Using Resonant Shunted Shear-Mode Piezoceramics  

Microsoft Academic Search

Vibration damping using shunted piezoceramics was the focus of many researches, in particular during the last decade, as attested\\u000a by the frequent surveys [1–3]. Most investigations have concerned the classical transverse-mode of piezoceramics which uses the material electromechanical coupling coefficient (EMCC) k31. However, the longitudinal-mode, exploiting the highest EMCC k33, has been much less investigated. Both modes provide the so-called

Ayech Benjeddou; Julie A. Ranger

326

A Direct Current Control of Shunt Active Power Filter  

Microsoft Academic Search

This paper presents a direct current control strategy of shunt active power filter system (SAPF) to eliminate harmonics generated by the nonlinear load. The SAPF system is realized using a three-phase voltage source inverter(VSI) with self-supported dc bus. The compensation principles and dynamics of the system are discussed in detail. The proportional- integral (PI) control strategy is adopted to maintain

Hong Qiu; Yin Zhongdong; Liu Qiao; Shan Renzhong

2009-01-01

327

Physiological states and intracardiac shunting in non-crocodilian reptiles  

Microsoft Academic Search

Historically, the evolution of the vertebrate heart was portrayed as a continuous progression from the two-chambered heart of fish to the completely divided, four-chambered heart of birds and mammals. The incompletely divided ventricle of non-crocodilian reptiles and the resulting central mixing of oxygen-rich and oxygen-poor blood (cardiac shunting) was viewed as an intermediate phylogenetic step that was functionally inefficient compared

James W. Hicks; Egle Krosniunas

1997-01-01

328

Silicon single crystalline MEMS shunt contact switch for RF application  

Microsoft Academic Search

A micro-electro-mechanical (MEMS) DC to RF shunt switch was fabricated using a bulk micromachining process for single crystal silicon. The switch was vertically integrated to a microwave circuit using flip-chip bonding technology. The pull-in voltage and switching time were measured. Also, RF characterization of switch states was performed. This new design offers the potential for a high power applications switch.

Oren Aharon; Shai Feldman; Yael Nemirovsky

2004-01-01

329

Modified Blalock-Taussig Shunt with an Umbilical Vein Graft  

PubMed Central

We describe a modification of the Blalock Taussig anastomosis, with the interposition of a glutaraldehyde-tanned umbilical vein graft between the subclavian and pulmonary arteries. This operation was performed in 64 children: 11 were less than 1 month of age (17.2%), and 23 were between 1 and 6 months of age (34.9%). Hospital deaths occurred in six patients—all less than 6 months of age (9.4%). There was no instance of shunt occlusion noted. The clinical course was uneventful among survivors, except for one patient who died of endocarditis in the late postoperative follow-up. The shunt procedure may be performed very rapidly, with minimal dissection, allowing the use of a graft larger than the diameter of the subclavian artery. This modification of the Blalock Taussig operation compares favorably with our previous experience with other shunt procedures and may be considered a valuable alternative in the palliative surgical treatment of several malformations with severe pulmonary oligemia. Images

Leao, Luiz Eduardo V.; Andrade, Jose Carlos S.; Succi, Jose Ernesto; Cueva, Clotario C.; Ribeiro, Expedito E.; Carvalho, Antonio Carlos C.; Buffolo, Enio

1985-01-01

330

Turbomachinery blades damping thanks to optimized shunted piezoelectric circuits  

NASA Astrophysics Data System (ADS)

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.

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

2008-05-01

331

Optical spectroscopy of DPVs and the case of LP Ara  

NASA Astrophysics Data System (ADS)

We present preliminary results of our spectroscopic campaign of a group of intermediate mass interacting binaries dubbed ``Double Periodic Variables'' (DPVs), characterized by orbital light curves and additional long photometric cycles recurring roughly after 33 orbital periods (Mennickent et al. 2003, 2005). They have been interpreted as interacting, semi-detached binaries showing cycles of mass loss into the interstellar medium (Mennickent et al. 2008, Mennickent & Ko?aczkowski 2009). High resolution Balmer and helium line profiles of DPVs can be interpreted in terms of mass flows in these systems. A system solution is given for LP Ara, based on modeling of the ASAS V-band orbital light curve and the radial velocity of the donor star.

Mennickent, Ronald E.; Graczyk, Darek; Ko?aczkowski, Zbigniew; Michalska, Gabriela; Barría, Daniela; Niemczura, Ewa

2011-07-01

332

The runaway binary LP 400-22 is leaving the Galaxy  

NASA Astrophysics Data System (ADS)

We present optical spectroscopy, astrometry, radio and X-ray observations of the runaway binary LP 400-22. We refine the orbital parameters of the system based on our new radial velocity observations. Our parallax data indicate that LP 400-22 is significantly more distant (3? lower limit of 840 pc) than initially predicted. LP 400-22 has a tangential velocity in excess of 830 km s-1; it is unbound to the Galaxy. Our radio and X-ray observations fail to detect a recycled millisecond pulsar companion, indicating that LP 400-22 is a double white dwarf system. This essentially rules out a supernova runaway ejection mechanism. Based on its orbit, a Galactic Centre origin is also unlikely. However, its orbit intersects the locations of several globular clusters; dynamical interactions between LP 400-22 and other binary stars or a central black hole in a dense cluster could explain the origin of this unusual binary.

Kilic, Mukremin; Gianninas, A.; Brown, Warren R.; Harris, Hugh C.; Dahn, Conard C.; Agüeros, M. A.; Heinke, Craig O.; Kenyon, S. J.; Panei, J. A.; Camilo, Fernando

2013-10-01

333

Improvement of image quality of time-domain diffuse optical tomography with lp sparsity regularization  

PubMed Central

An lp (0 < p ? 1) sparsity regularization is applied to time-domain diffuse optical tomography with a gradient-based nonlinear optimization scheme to improve the spatial resolution and the robustness to noise. The expression of the lp sparsity regularization is reformulated as a differentiable function of a parameter to avoid the difficulty in calculating its gradient in the optimization process. The regularization parameter is selected by the L-curve method. Numerical experiments show that the lp sparsity regularization improves the spatial resolution and recovers the difference in the absorption coefficients between two targets, although a target with a small absorption coefficient may disappear due to the strong effect of the lp sparsity regularization when the value of p is too small. The lp sparsity regularization with small p values strongly localizes the target, and the reconstructed region of the target becomes smaller as the value of p decreases. A phantom experiment validates the numerical simulations.

Okawa, Shinpei; Hoshi, Yoko; Yamada, Yukio

2011-01-01

334

78 FR 18329 - Gulf South Pipeline Company, LP; Petal Gas Storage, L.L.C.; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...Pipeline Company, LP (Gulf South), 9 Greenway Plaza, Suite 2800, Houston, Texas...Gas Storage, L.L.C. (Petal), 9 Greenway Plaza, Suite 2800, Houston, Texas...Boardwalk Pipeline Partners, LP, 9 Greenway Plaza, Houston, Texas 77046, by...

2013-03-26

335

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

Federal Register 2010, 2011, 2012, 2013

...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...

2011-10-27

336

76 FR 70717 - DCP Midstream, LP; Notice of Intent To Prepare an Environmental Assessment for the Proposed...  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. CP11-549-000] DCP Midstream, LP; Notice of Intent To Prepare an Environmental...involving construction and operation of facilities by DCP Midstream, LP (DCP) in Weld County, Colorado. This EA will be used...

2011-11-15

337

78 FR 47313 - DCP Midstream, LP; Notice of Intent To Prepare an Environmental Assessment for the Proposed...  

Federal Register 2010, 2011, 2012, 2013

...Regulatory Commission [Docket No. CP13-509-000] DCP Midstream, LP; Notice of Intent To Prepare an Environmental...involving construction and operation of facilities by DCP Midstream, LP (DCP) in Weld County, Colorado. The Commission will...

2013-08-05

338

78 FR 338 - Buckeye Hammond Railroad, L.L.C.; Acquisition and Operation Exemption; Buckeye Partners, L.P.  

Federal Register 2010, 2011, 2012, 2013

...C.; Acquisition and Operation Exemption; Buckeye Partners, L.P. Buckeye Hammond Railroad, L.L.C. (BHRR), a...under 49 CFR 1150.31 \\1\\ to acquire from Buckeye Partners, L.P., a noncarrier, and to operate...

2013-01-03

339

77 FR 71680 - Buckeye East Chicago Railroad, LLC-Acquisition and Operation Exemption-Buckeye Partners, L.P.  

Federal Register 2010, 2011, 2012, 2013

...Acquisition and Operation Exemption--Buckeye Partners, L.P. Buckeye East Chicago Railroad, LLC (BERR), a noncarrier...exemption under 49 CFR 1150.31 to acquire from Buckeye Partners, L.P., a noncarrier, and to operate...

2012-12-03

340

75 FR 79065 - Emergence Capital Partners SBIC, L.P. License No. 09/79-0454; Notice Seeking Exemption Under...  

Federal Register 2010, 2011, 2012, 2013

...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes...The financing is contemplated for working capital and general operating...

2010-12-17

341

76 FR 25732 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes...The financing is contemplated for working capital and general operating...

2011-05-05

342

75 FR 3502 - KLH Capital, L.P.; Notice Seeking Exemption Under 312 of the Small Business Investment Act...  

Federal Register 2010, 2011, 2012, 2013

...Notice is hereby given that KLH Capital, L.P., 101 East Kennedy Boulevard...CFR 107.730 (2006)). KLH Capital, L.P. proposes to provide financing...expansion, product development, and working capital. The financing is brought...

2010-01-21

343

76 FR 28843 - Emergence Capital Partners SBIC, L.P.; Notice Seeking Exemption Under Section 312 of the Small...  

Federal Register 2010, 2011, 2012, 2013

...is hereby given that Emergence Capital Partners SBIC, L.P., 160 Bovet...13 CFR 107.730). Emergence Capital Partners SBIC, L.P. proposes...The financing is contemplated for working capital and general operating...

2011-05-18

344

78 FR 51706 - Bayer CropScience LP; Determination of Nonregulated Status of Soybean Genetically Engineered for...  

Federal Register 2010, 2011, 2012, 2013

...Inspection Service [Docket No. APHIS-2012-0029] Bayer CropScience LP; Determination of Nonregulated Status...our determination that a soybean line developed by Bayer CropScience LP (Bayer), designated as event FG72, which has been...

2013-08-21

345

77 FR 52018 - Oxy Midstream Strategic Development, LLC, Magellan Midstream Partners, L.P.; Notice of Petition...  

Federal Register 2010, 2011, 2012, 2013

...OR12-25-000] Oxy Midstream Strategic Development, LLC, Magellan Midstream Partners, L.P.; Notice of Petition for Declaratory...2012), Oxy Midstream Strategic Development, LLC and Magellan Midstream Partners, L.P., on behalf of BridgeTex...

2012-08-28

346

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

PubMed Central

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.

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

2014-01-01

347

A multi-stack simulation of shunt currents in vanadium redox flow batteries  

NASA Astrophysics Data System (ADS)

A model for the shunt currents in an all-vanadium redox flow battery consisting of 3 stacks which are electrically connected in series. It is based on an equivalent circuit which treats the shunt current pathways as Ohmic resistors. The conductivity of the vanadium electrolyte has been measured for different state-of-charges in order to implement a dependency of the resistances on the state-of-charge of the system. Published results are used to validate the simulation data of a single stack. Three setups of pipe networks are evaluated using the model. The pipe connections between the stacks give rise to external shunt currents, which also increase the amount of shunt currents within the stacks. These connections also lead to a nonuniform distribution of the shunt currents. The effects of the shunt currents on the Coulombic efficiency and the energy efficiency of the system are studied by the means of the model.

Wandschneider, F. T.; Röhm, S.; Fischer, P.; Pinkwart, K.; Tübke, J.; Nirschl, H.

348

The epidemiology of Lp-PLA 2: Distribution and correlation with cardiovascular risk factors in a population-based cohort  

Microsoft Academic Search

Lipoprotein-associated phospholipase A2 (Lp-PLA2) is an enzyme that is produced by inflammatory cells (macrophages, T-lymphocytes and mast cells) and hydrolyzes oxidized phospholipids in LDL. Several epidemiology studies indicate that Lp-PLA2 appears to be an independent marker of cardiovascular risk. This study was conducted to define the distribution of Lp-PLA2 in a large population-based cohort and to determine associations between Lp-PLA2

Margaretha Persson; Jan-Åke Nilsson; Jeanenne J. Nelson; Bo Hedblad; Göran Berglund

2007-01-01

349

AC-DC current shunts and system for extended current and frequency ranges  

Microsoft Academic Search

This paper describes a new ac-dc current-shunt calibration system with a current range of 1 mA-100 A and a frequency range from 10 Hz to 100 kHz. The new system consists of an ac-dc comparator controlled via a universal serial bus and a set of reference coaxial shunts with dedicated thermal voltage converters. The design of the custom-built shunts has

Piotr S. Filipski; Michael Boecker

2006-01-01

350

AC-DC Current Shunts and System for Extended Current and Frequency Ranges  

Microsoft Academic Search

The paper describes a new ac-dc current shunt calibration system with a testing current range of 1 mA to 100 A and frequency range 10 Hz-100 kHz. The new system consists of a USB controlled ac-dc comparator and a set of reference coaxial shunts with dedicated thermal voltage converters. The design of custom build shunts has been optimized through theoretical

Piotr S. Filipski; Michael Boecker

2005-01-01

351

Method for multiple-mode shunt damping of structural vibration using a single PZT transducer  

Microsoft Academic Search

We report a method for passive piezoelectric shunt-damping of multiple vibration modes using a single piezoelectric transducer (PZT). The method, which is different from other multiple-mode shunting, is to employ a 'blocking' circuit in series with each parallel resistor-inductor shunt circuit designed for one structural mode. The 'blocking' circuit consists of one parallel capacitor-inductor antiresonant circuit or a series of

Shu-Yau Wu

1998-01-01

352

A current-flowing electromagnetic shunt damper for multi-mode vibration control of cantilever beams  

Microsoft Academic Search

In this paper, a multi-mode electromagnetic shunt damper employing the current-flowing method is newly developed for the semi-active vibration control of flexible structures. The electromagnetic shunt damper, which is used for the electromagneto-mechanical coupling transduction between vibrating structures and the electrical shunt circuit, consists of a coil and a permanent magnet. The conducting coil is attached to the cantilever beams

Tai-Hong Cheng; Il-Kwon Oh

2009-01-01

353

Method for Multiple Mode Piezoelectric Shunting with Single PZT Transducer for Vibration Control  

Microsoft Academic Search

We report a method for passive piezoelectric shunt-damping of multiple vibration modes using a single piezoelectric transducer (PZT). The method, which is different from other multiple-mode shunting (Edberg et al., 1992; Hollkamp, 1994), is to employ a blocking circuit in series with each parallel resistor-inductor shunt circuit designed to control one structural mode. The blocking circuit consists of one parallel

Shu-Yau Wu

1998-01-01

354

A new electromagnetic shunt damping treatment and vibration control of beam structures  

Microsoft Academic Search

In this paper a new class of shunted electromagnetic damping treatment is proposed: a non-contact electromagnetic shunt damper (NC-EMSD). The NC-EMSD consists of an electromagnet attached to a host structure, a permanent magnet attached to the fixed boundary and an electrical impedance connected to the terminals of the electromagnet. The electromagnet and the shunt impedance constitute a closed circuit. When

Hongpan Niu; Xinong Zhang; Shilin Xie; Pengpeng Wang

2009-01-01

355

Assessing the role of transition metals in shunting mechanisms using synchrotron-based techniques  

Microsoft Academic Search

Shunts in RGS and BaySix materials have been analyzed using a powerful combination of techniques including lock-in thermography, X-ray beam induced current, and X-ray fluorescence microscopy. Transition metals have been identified at shunt locations in both materials. Titanium and silver were found at a shunt in BaySix material, suggesting a process-induced defect related to faulty metallization grid deposition. Iron and

Tonio Buonassisi; Oleg F. Vyvenkol; Andrei A. Istratov; Eicke R. Weber; Giso Hahn; Detlef Sontag; Jean-Patrice Rakotoniaina; Otwin Breitenstein; Joerg Isenberg; Roland Schindler

2003-01-01

356

Investigating Source Mechanisms of LP Events Recorded on Piton de la Fournaise, La Réunion  

NASA Astrophysics Data System (ADS)

Magmatic and hydrothermal processes play a significant role in generating seismicity at active volcanoes. These signals can be recorded at the surface and can be used to obtain an insight into the volcano's internal dynamics. Long Period (LP) events are of particular interest as the mechanisms of these events are still not well understood. LP events typically have peaked spectra ranging in frequencies between 0.5 to 5 Hz, and often precede or accompany volcanic eruptions. Piton de la Fournaise, La Réunion, is one of the most active volcanoes in the world, however LP events on Piton de la Fournaise are rare. A seismic network of 21 broadband seismometers, funded through the UnderVolc project, has been operational on the volcano since November 2009. Since deployment the volcano has erupted five times, but only 15 LP events were recorded in this period. Three of these eruptions were preceded by LP events, and several LP events were recorded during an intrusive phase. The LP events have dominant frequencies ranging between 2 and 4 Hz and, as typical for LP events, the P- and S-wave phases are difficult to differentiate at stations close to the summit. A family of similar LP events exists within these events. In this work we will attempt to address the important question as to why such an active volcano has so few LP events, and what we can learn about the eruption process from these particular events. The source location of the family of LP events was determined using a double-difference method; the events are located within the summit crater, at a very shallow depth. In this study 3D full-waveform simulations were carried out to determine the source mechanism. Preliminary analysis of the source mechanism can best be described as a crack; constrained inversion will also be performed to determine the crack orientation. This suggests that the LP events may play a role in accommodating the deformation inside the crater. We will also investigate the relationship between LP occurrence and eruptive characteristics (size of the eruption, deformation of the edifice, etc.).

Zecevic, M.; De Barros, L.; O'Brien, G. S.; Bean, C. J.; Brenguier, F.

2011-12-01

357

78 FR 63560 - Notice of Receipt of an Application by Magellan Pipeline Company, L.P., for Issuance of a...  

Federal Register 2010, 2011, 2012, 2013

...Application by Magellan Pipeline Company, L.P., for Issuance of a Presidential Permit...Application by Magellan Pipeline Company, L.P., for Issuance of a Presidential Permit...received from Magellan Pipeline Company, L.P. (``Magellan'') notice that it...

2013-10-24

358

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

Federal Register 2010, 2011, 2012, 2013

...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...

2010-12-07

359

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

Federal Register 2010, 2011, 2012, 2013

...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...

2010-08-20

360

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

Federal Register 2010, 2011, 2012, 2013

...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,...

2010-10-19

361

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

Federal Register 2010, 2011, 2012, 2013

...Training Administration [TA-W-72,575] Dell Products LP, Winston-Salem (WS-1...March 1, 2010, applicable to workers of Dell Products LP, Winston- Salem (WS-1...Winston-Salem, North Carolina location of Dell Products LP, Winston-Salem...

2010-09-16

362

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

Federal Register 2010, 2011, 2012, 2013

...Training Administration [TA-W-72,575] Dell Products LP, Winston-Salem (WS-1...March 1, 2010, applicable to workers of Dell Products LP, Winston- Salem (WS-1...Winston-Salem, North Carolina location of Dell Products LP, Winston-Salem...

2010-09-21

363

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

Federal Register 2010, 2011, 2012, 2013

...Training Administration [TA-W-72,575] Dell Products LP, Winston-Salem (WS-1...March 1, 2010, applicable to workers of Dell Products LP, Winston- Salem (WS-1...Winston-Salem, North Carolina location of Dell Products LP, Winston-Salem...

2010-09-13

364

78 FR 28273 - Alpine Investors IV SBIC, LP; Notice Seeking Exemption Under Section 312 of the Small Business...  

Federal Register 2010, 2011, 2012, 2013

...ADMINISTRATION [License No. 09/09-0461] Alpine Investors IV SBIC, LP; Notice Seeking...of Interest Notice is hereby given that Alpine Investors IV SBIC, LP, 3 Embarcadero...Regulations (13 CFR 107.730). Alpine Investors IV SBIC, LP, proposes to...

2013-05-14

365

76 FR 63278 - Bayer CropScience LP; Determination of Nonregulated Status for Cotton Genetically Engineered for...  

Federal Register 2010, 2011, 2012, 2013

...Service [Docket No. APHIS-2010-0102] Bayer CropScience LP; Determination of Nonregulated...genetically engineered cotton developed by Bayer CropScience LP, designated as TwinLink...on our evaluation of data submitted by Bayer CropScience LP in its petition for a...

2011-10-12

366

77 FR 41351 - Bayer CropScience LP; Availability of a Finding of No Significant Impact and a Preliminary...  

Federal Register 2010, 2011, 2012, 2013

...Service [Docket No. APHIS-2012-0034] Bayer CropScience LP; Availability of a Finding...preliminary decision regarding a request from Bayer CropScience LP to extend to cotton event...118, Riverdale, MD 20737- 1238. The Bayer CropScience LP extension request,...

2012-07-13

367

77 FR 21587 - Bayer Cropscience, LP, Including On-Site Leased Workers From Jacobs PSG, Middough Associates, Inc...  

Federal Register 2010, 2011, 2012, 2013

...Training Administration [TA-W-81,021] Bayer Cropscience, LP, Including On-Site...February 3, 2012, applicable to workers of Bayer Cropscience, LP, including on-site...the Institute, West Virginia location of Bayer CropScience, LP. The Department has...

2012-04-10

368

Characterization of the apoLp-III/LPS complex: insight in the mode of binding interaction  

PubMed Central

Apolipoproteins are able to associate with lipopolysaccharides (LPS), potentially providing protection against septic shock. To gain insight in the molecular details of this binding interaction, apolipophorin III (apoLp-III) from Galleria mellonella was used as a model. The binding of apoLp-III to LPS was optimal around 37–40 °C, close to the LPS phase transition temperature. ApoLp-III formed complexes with LPS from E. coli (serotype O55:B5) with a diameter of 24 nm, a molecular weight of ~390 kDa, containing four molecules of apoLp-III and 24 molecules of LPS. The LPS-bound form of the protein was substantially more resistant to guanidine-induced denaturation compared to unbound protein. The denaturation profile displayed a multiphase character with a steep drop in secondary structure between 0–1 M guanidine, and a slower decrease above 1 M guanidine HCl. In contrast, apoLp-III bound to detoxified LPS was only slightly more resistant to guanidine HCl induced denaturation compared to unbound protein. Analysis of size-exclusion FPLC elution profiles of mixtures of apoLp-III with LPS or detoxified LPS indicated a much weaker binding interaction with detoxified LPS compared to intact LPS. These results indicate that apoLp-III initially interacts with exposed carbohydrate regions, but that the lipid A region is required for a more stable LPS binding interaction.

Oztug, Merve; Martinon, Daisy; Weers, Paul M.M.

2012-01-01

369

Neural Network Based Modeling and Analysis of LP Control Surface Allocation  

NASA Technical Reports Server (NTRS)

This paper presents an approach to interpretive modeling of LP based control allocation in intelligent flight control. The emphasis is placed on a nonlinear interpretation of the LP allocation process as a static map to support analytical study of the resulting closed loop system, albeit in approximate form. The approach makes use of a bi-layer neural network to capture the essential functioning of the LP allocation process. It is further shown via Lyapunov based analysis that under certain relatively mild conditions the resulting closed loop system is stable. Some preliminary conclusions from a study at Ames are stated and directions for further research are given at the conclusion of the paper.

Langari, Reza; Krishnakumar, Kalmanje; Gundy-Burlet, Karen

2003-01-01

370

Fine spectra of upper triangle triple band matrices over the sequence spaces lp, (0 < p < ?)  

NASA Astrophysics Data System (ADS)

The operator A(r, s, t) on sequence space on lp is defined A(r,s,t)x = (rxk-1+sxk+txk+)k = ? where x = (xk)\\isinvlp with (0 < p < 1). The main purpose of this paper is to determine the fine spectrum with respect to the Goldberg's classification of the operator A(r, s, t) defined by a triple sequential band matrix over the sequence space lp. Additionally, we give the approximate point spectrum, defect spectrum and compression spectrum of the matrix operator A(r, s, t) over the space lp.

Ba?ar, Feyzi; Karaisa, Ali

2012-08-01

371

The ventriculo-gallbladder shunt in the treatment of refractory hydrocephalus: a review of the current literature.  

PubMed

The ventriculo-gallbladder (VGB) shunt has been reported on several occasions for the alleviation of ventriculo-peritoneal (VP) -shunt-refractory hydrocephalus. There is little data regarding VGB shunts and a need for delineating appropriate surgical therapy when cerebrospinal fluid drainage to the peritoneum becomes infeasible. We report our experience with VGB shunt placement in three patients with chronic hydrocephalus. All three had a history of prior VP-shunt placements and revisions due to distal obstruction or infection, or contraindications to alternative forms of ventricular drainage. In one patient, the VGB shunt functioned well for 9 years but was revised due to contamination during an unrelated operation. Neither of the other two patients have experienced VGB shunt-related complications. VP shunts are presently regarded as the standard of care for uncomplicated hydrocephalus. When VP shunts fail, the most common alternatives have been ventriculo-atrial and ventriculo-pleural shunts. In five case series involving 59 patients with VGB shunts, the long-term success rate was 62.7 per cent. Infection (10.2%) and obstruction (10.2%) were the most common complications. Based on durability and a low incidence of complications, it is the current consensus that VGB shunts are a viable alternative with good outcomes in the case of failed VP shunts. PMID:19725301

Girotti, Micah E; Singh, R Ramesh; Rodgers, Bradley M

2009-08-01

372

Neuropsychological Assessment of Adult Patients with Shunted Hydrocephalus  

PubMed Central

Objective This study is planned to determine the neurocognitive difficulties of hydrocephalic adults. Methods The research group contained healthy adults (control group, n : 15), and hydrocephalic adults (n : 15). Hydrocephalic group consisted of patients with idiopathic aquaduct stenosis and post-meningitis hydrocephalus. All patients were followed with shunted hydrocephalus and not gone to shunt revision during last two years. They were chosen from either asymptomatic or had only minor symptoms without motor and sensorineural deficit. A neuropsychological test battery (Raven Standart Progressive Matrices, Bender-Gestalt Test, Cancellation Test, Clock Drawing Test, Facial Recognition Test, Line Orientation Test, Serial Digit Learning Test, Stroop Color Word Interference Test-TBAG Form, Verbal Fluency Test, Verbal Fluency Test, Visual-Aural Digit Span Test-B) was applied to all groups. Results Neuropsychological assessment of hydrocephalic patients demonstrated that they had poor performance on visual, semantic and working memory, visuoconstructive and frontal functions, reading, attention, motor coordination and executive function of parietal lobe which related with complex and perseverative behaviour. Eventually, these patients had significant impairment on the neurocognitive functions of their frontal, parietal and temporal lobes. On the other hand, the statistical analyses performed on demographic data showed that the aetiology of the hydrocephalus, age, sex and localization of the shunt (frontal or posterior parietal) did not affect the test results. Conclusion This prospective study showed that adult patients with hydrocephalus have serious neuropsychological problems which might be directly caused by the hydrocephalus; and these problems may cause serious adaptive difficulties in their social, cultural, behavioral and academic life.

Bakar, Emel Erdogan

2010-01-01

373

Exercise-induced Arteriovenous Intrapulmonary Shunting in Dogs  

PubMed Central

Rationale: We have previously shown, using contrast echocardiography, that intrapulmonary arteriovenous pathways are inducible in healthy humans during exercise; however, this technique does not allow for determination of arteriovenous vessel size or shunt magnitude. Objectives: The purpose of this study was to determine whether large-diameter (more than 25 ?m) intrapulmonary arteriovenous pathways are present in the dog, and whether exercise recruits these conduits. Methods: Through the right forelimb, 10.8 million 25-?m stable isotope-labeled microspheres (BioPAL, Inc., Worcester, MA) were injected either at rest (n = 8) or during high-intensity exercise (6– 8 mph, 10–15% grade, n = 6). Systemic arterial blood was continuously sampled during and for 3 minutes after injection. After euthanasia, tissue samples were obtained from the heart, liver, kidney, and skeletal muscle. In addition, 25- and 50-?m microspheres were infused into four isolated dog lungs that were ventilated and perfused at constant pressures similar to exercise. Measurements and Main Results: Blood and tissue samples were commercially analyzed for the presence of microspheres. No microspheres were detected in the arterial blood or tissue samples from resting dogs. In contrast, five of six exercising dogs showed evidence of exercise-induced intrapulmonary arteriovenous shunting, as microspheres were detected in arterial blood and/or tissue. Furthermore, shunt magnitude was calculated to be 1.4 ± 0.8% of cardiac output (n = 3). Evidence of intrapulmonary arteriovenous anastomoses was also found in three of four isolated lungs. Conclusions: Consistent with previous human findings, these data demonstrate that intrapulmonary arteriovenous pathways are functional in the dog and are recruited with exercise.

Stickland, Michael K.; Lovering, Andrew T.; Eldridge, Marlowe W.

2007-01-01

374

Hypoxia-induced intrapulmonary arteriovenous shunting at rest in healthy humans.  

PubMed

Intrapulmonary arteriovenous (IPAV) shunting has been shown to occur at rest in some subjects breathing a hypoxic gas mixture [fraction of inspired oxygen (FI(O(2))) = 0.12] for brief periods of time. In the present study we set out to determine if IPAV shunting could be induced at rest in all subjects exposed to hypoxia for 30 min. Twelve subjects (6 women) breathed four levels of hypoxia (FI(O(2)) = 0.16, 0.14, 0.12, and 0.10) for 30 min each in either an ascending or descending order with a 15-min normoxic break between bouts. Saline contrast echocardiography was used to detect IPAV shunt and a shunt score (0-5) was assigned based on contrast in the left ventricle with a shunt score ? 2 considered significant. Pulmonary artery systolic pressure (PASP) was determined using Doppler ultrasound. The total number of subjects demonstrating shunt scores ? 2 for FI(O(2)) = 0.16, 0.14, 0.12, and 0.10 was 1/12, 7/12, 9/12, and 12/12, respectively. Shunt scores were variable between subjects but significantly greater than normoxia for FI(O(2)) = 0.12 and 0.10. Shunt scores correlated with peripheral measurements of arterial oxygen saturation (SpO(2)) (r(w) = -0.67) and PASP (r(w) = 0.44), despite an increased shunt score but no increase in PASP while breathing an FI(O(2)) = 0.12. It is unknown how hypoxia induces the opening of IPAV shunts, but these vessels may be controlled via similar mechanisms as systemic vessels that vasodilate in response to hypoxia. Despite intersubject variability our results indicate significant IPAV shunting occurs at rest in all subjects breathing an FI(O(2)) = 0.10 for 30 min. PMID:20689088

Laurie, Steven S; Yang, Ximeng; Elliott, Jonathan E; Beasley, Kara M; Lovering, Andrew T

2010-10-01

375

Shunting arc plasma source for pure carbon ion beam.  

PubMed

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

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

2012-02-01

376

Shunting arc plasma source for pure carbon ion beam  

NASA Astrophysics Data System (ADS)

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.

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

2012-02-01

377

Damping subsynchronous resonance using a simo shunt reactor controller  

SciTech Connect

Stabilizing torsional oscillations using a single-input multiple-output (SIMO) shunt reactor controller is investigated in this paper. An eigenstructure assignment technique is applied to design this controller. The designed controller can be easily implemented by a multiple-proportional-integral (MPI) controller using the medium pressure turbine speed, the two low pressure turbine speeds, and the generator shaft speed as feedback signals. Eigenvalue analyses under different operating conditions and a wide range of series compensation degrees, time domain simulations under a pulsed torque disturbance, and Fast-Fourier-Transform (FFT) analyses for system behavior are all performed in order to demonstrate the effectiveness of the proposed controller.

Lee, S.; Liu, C.C. (National Taiwan Univ., Taipei (Taiwan, Province of China). Dept. of Electrical Engineering)

1994-08-01

378

Perturbation theory for a resistivity shunted Josephson element  

NASA Technical Reports Server (NTRS)

We present a systematic perturbation theory, extendable in principle to all orders of magnitude, for the solution of the equations of motion of an ideal Josephson element shunted by a resistance and driven by a dc current source and a small time-dependent source. We present second-order results for the case in which the time dependence is that of a single sinusoid, and these results are compared with other numerical and analytical calculations. Near, but not on, the first constant voltage step where the perturbation theory appears divergent, the current-voltage characteristic is calculated by means of a nonperturbative adiabatic procedure. The impedance and responsivity agree with earlier results.

Thompson, E. D.

1973-01-01

379

The atherogenic lipoprotein Lp(a) is internalized and degraded in a process mediated by the VLDL receptor.  

PubMed Central

Lp(a) is a major inherited risk factor associated with premature heart disease and stroke. The mechanism of Lp(a) atherogenicity has not been elucidated, but likely involves both its ability to influence plasminogen activation as well as its atherogenic potential as a lipoprotein particle after receptor-mediated uptake. We demonstrate that fibroblasts expressing the human VLDL receptor can mediate endocytosis of Lp(a), leading to its degradation within lysosomes. In contrast, fibroblasts deficient in this receptor are not effective in catabolizing Lp(a). Lp(a) degradation was prevented by antibodies against the VLDL receptor, and by RAP, an antagonist of ligand binding to the VLDL receptor. Catabolism of Lp(a) was inhibited by apolipoprotein(a), but not by LDL or by monoclonal antibodies against apoB100 that block LDL binding to the LDL receptor, indicating that apolipoprotein(a) mediates Lp(a) binding to this receptor. Removal of Lp(a) antigen from the mouse circulation was delayed in mice deficient in the VLDL receptor when compared with control mice, indicating that the VLDL receptor may play an important role in Lp(a) catabolism in vivo. We also demonstrate the expression of the VLDL receptor in macrophages present in human atherosclerotic lesions. The ability of the VLDL receptor to mediate endocytosis of Lp(a) could lead to cellular accumulation of lipid within macrophages, and may represent a molecular basis for the atherogenic effects of Lp(a).

Argraves, K M; Kozarsky, K F; Fallon, J T; Harpel, P C; Strickland, D K

1997-01-01

380

Vibration control of an HDD disk-spindle system using piezoelectric bimorph shunt damping: II. Optimal design and shunt damping implementation  

NASA Astrophysics Data System (ADS)

This paper presents the experimental implementation of piezoelectric shunt damping for an HDD disk-spindle system. Prior to evaluating the shunt damping performance of the drive, the piezoelectric bimorph designed in part I is optimally redesigned so as to satisfy desirable shunt damping performance. The electrical admittance of the bimorph is derived from the piezoelectric constitutive equation and stress-strain relationship. Subsequently, in order to maximize the electrical admittance two electrodes of the bimorph are formed on an annular piezoelectric disk by considering the target vibration mode. The sensitivity analysis method is then employed to determine the optimal design parameters. After manufacturing the piezoelectric bimorph with optimally obtained design parameters, the vibration control performance of the proposed shunt damping for the HDD disk-spindle system is empirically evaluated in the frequency domain by changing the impact and measuring points.

Lim, S. C.; Choi, S. B.

2007-06-01

381

76 FR 72191 - Gulf South Pipeline Company, LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...application should be directed to M.L. Gutierrez, Director, Regulatory Affairs, Gulf South Pipeline Company, LP, 9 Greenway Plaza, Suite 2800, Houston, Texas 77046, or by calling (713) 479-8252 (telephone) or (713) 479-1745...

2011-11-22

382

78 FR 16845 - Gulf South Pipeline Company, LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...should be directed to Mr. J. Kyle Stephens, Vice-President, Regulatory Affairs, Gulf South Pipeline Company, LP, 9 Greenway Plaza, Suite 2800, Houston, Texas, 77046, or by calling (713) 479-8033 (telephone) or (713) 479-1846...

2013-03-19

383

75 FR 29466 - Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel...  

Federal Register 2010, 2011, 2012, 2013

...2009-NM-188-AD] RIN 2120-AA64 Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel Aircraft Industries, Ltd.) Model Gulfstream G150 Airplanes AGENCY: Federal Aviation Administration (FAA),...

2010-05-26

384

75 FR 76317 - Airworthiness Directives; Gulfstream Aerospace LP (Type Certificate Previously Held by Israel...  

Federal Register 2010, 2011, 2012, 2013

...LP (Type Certificate Previously Held by Israel Aircraft Industries, Ltd.) Model Astra...Discussion The Civil Aviation Authority of Israel (CAAI), which is the aviation authority for Israel, has issued Israeli Airworthiness...

2010-12-08

385

LP-Gas Tank Explosion Kills Two Volunteer Firefighters, Carthage, Illinois.  

National Technical Information Service (NTIS)

Two Carthage, Illinois Fire Department volunteer firefighters died, one was seriously injured, and another was injured when a horizontal liquefied petroleum gas (LP-Gas) tank BLEVEed (Boiling Liquid Expanding Vapor Explosion).

M. W. Lackman T. H. Miller

1997-01-01

386

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

Code of Federal Regulations, 2010 CFR

...petroleum gases. (b) Welding on LP-Gas containers. Welding is prohibited on...appliances or mechanical ventilation air intakes. ...popularly known in the industry as “skid tanks...weight. (4) Field welding where...

2010-07-01

387

78 FR 53487 - Equinox Funds Trust and Equinox Institutional Asset Management LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...812-14129] Equinox Funds Trust and Equinox Institutional Asset Management LP; Notice of Application...Prezioso, Equinox Fund Management, LLC, 1775 Sherman...provide general management services to each Subadvised Fund, including...

2013-08-29

388

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

Federal Register 2010, 2011, 2012, 2013

...C. 791a--825r. h. Applicant Contact: Timothy Lukas, Compliance Specialist, Erie Boulevard Hydropower, LP, Hudson River Operations, 399 Big Bay Road, Queensbury, NY 12804; telephone (518) 743-2012. i. FERC Contact: John K....

2011-03-02

389

78 FR 38306 - Pacific Connector Gas Pipeline, LP; Notice of Application  

Federal Register 2010, 2011, 2012, 2013

...000 Dekatherms per day of natural gas to the Jordan Cove LNG Export Terminal being developed by Jordan Cove Energy Project, L.P. that separately...June 8, 2012, the Commission staff granted Jordan Cove's request to utilize the...

2013-06-26

390

On resistant Lp-Norm Estimation by means of iteratively reweighted least Squares  

NASA Astrophysics Data System (ADS)

The L1-norm estimation is a resistant estimation method and therefore used for the detection of gross errors in geodetic measurement data. Alternatively, other Lp-norms have been suggested in literature for resistant parameter estimation. A common numerical solution method for Lp-norm estimation is the method of iteratively reweighted least squares. Procedural manners for a successful application of this method are considered. A modification of the method is given, which reduces the number of iterations significantly. By means of a simulation the applicability of the mentioned methods and the success of different Lp-norms in the detection of gross errors are tested. It shows that solving the L1-norm numerically may be unsuccessful and that instead a resistant Lp-norm is to be recommended, which is comparably successful in the detection of gross errors and can successfully be solved numerically by the presented modification of iteratively reweighted least squares.

Marx, Christian

2013-03-01

391

77 FR 12868 - Approval of Saybolt LP, as a Commercial Gauger  

Federal Register 2010, 2011, 2012, 2013

...SUMMARY: Notice is hereby given that, pursuant to 19 CFR 151.13, Saybolt LP, 190 James Drive East, Suite 110, St. Rose, LA 70087, has been approved to gauge petroleum, petroleum products, organic chemicals and vegetable oils for customs...

2012-03-02

392

77 FR 41363 - BASF Plant Science, LP; Availability of Petition for Determination of Nonregulated Status of...  

Federal Register 2010, 2011, 2012, 2013

...DEPARTMENT OF AGRICULTURE Animal and Plant Health Inspection Service [Docket No. APHIS-2012-0028] BASF Plant Science, LP; Availability of Petition...Herbicide Tolerance AGENCY: Animal and Plant Health Inspection Service, USDA....

2012-07-13

393

78 FR 66892 - BASF Plant Science LP; Availability of Plant Pest Risk Assessment and Environmental Assessment...  

Federal Register 2010, 2011, 2012, 2013

...DEPARTMENT OF AGRICULTURE Animal and Plant Health Inspection Service [Docket No. APHIS-2012-0028] BASF Plant Science LP; Availability of Plant Pest Risk Assessment and Environmental Assessment for...

2013-11-07

394

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

Federal Register 2010, 2011, 2012, 2013

...power marketer using existing international transmission facilities for...utilities, Federal power marketing agencies and other entities...United States. The existing international transmission facilities to...Rocheleau, Brookfield Energy Marketing LP, 480 de la Cite...

2010-07-02

395

78 FR 6828 - Accreditation and Approval of Saybolt LP, as a Commercial Gauger and Laboratory  

Federal Register 2010, 2011, 2012, 2013

...to CBP regulations, that Saybolt LP, has been approved to gauge and accredited to test petroleum and petroleum products, organic...Ave., Suite 201, Carson, CA 90810, has been approved to gauge and accredited to test petroleum and petroleum products,...

2013-01-31

396

78 FR 52556 - Accreditation and Approval of Saybolt, LP, as a Commercial Gauger and Laboratory  

Federal Register 2010, 2011, 2012, 2013

...to CBP regulations, that Saybolt, LP, has been approved to gauge and accredited to test petroleum and petroleum products, organic...1123 Highway 43, Saraland, AL 36571, has been approved to gauge and accredited to test petroleum and petroleum products,...

2013-08-23

397

78 FR 66756 - Accreditation and Approval of Saybolt, LP, as a Commercial Gauger and Laboratory  

Federal Register 2010, 2011, 2012, 2013

...to CBP regulations, that Saybolt, LP, has been approved to gauge and accredited to test petroleum and petroleum products, organic...Highway, Ft. Lauderdale, FL 33316, has been approved to gauge and accredited to test petroleum and petroleum products,...

2013-11-06

398

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

Federal Register 2010, 2011, 2012, 2013

...to CBP regulations, that Saybolt, LP, has been approved to gauge petroleum and petroleum products for customs purposes for the...Phyllis St., Unit 100, Jacksonville, FL, has been approved to gauge petroleum and petroleum products for customs purposes, in...

2013-11-06

399

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

Federal Register 2010, 2011, 2012, 2013

...hereby given that, pursuant to 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...

2012-08-20

400

78 FR 57408 - Accreditation and Approval of Saybolt, LP, as a Commercial Gauger and Laboratory  

Federal Register 2010, 2011, 2012, 2013

...to CBP regulations, that Saybolt, LP, has been approved to gauge and accredited to test petroleum and petroleum products, organic...Mill Run Blvd., Pittsburgh, PA 15227, has been approved to gauge and accredited to test petroleum and petroleum products,...

2013-09-18

401

76 FR 65507 - Notice of Petition for Rate Approval; Eagle Ford Midstream, LP  

Federal Register 2010, 2011, 2012, 2013

...Notice of Petition for Rate Approval; Eagle Ford Midstream, LP Take notice that on October 11, 2011, (Eagle Ford) filed a petition for rate approval pursuant...Statement of Operating Conditions. Eagle Ford states that it is an existing...

2011-10-21

402

76 FR 64962 - Accreditation and Approval of SAYBOLT LP, as a Commercial Gauger and Laboratory  

Federal Register 2010, 2011, 2012, 2013

...listing of CBP approved gaugers and accredited laboratories. http://cbp.gov/xp/cgov/import/operations_support/labs_scientific_svcs/commercial_gaugers/ DATES: The accreditation and approval of Saybolt LP, as commercial gauger...

2011-10-19

403

6. ROOF OF TURBINE BUILDING AND OF L.P. BOILER ROOM ...  

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

6. ROOF OF TURBINE BUILDING AND OF L.P. BOILER ROOM FROM NORTH END OF TURBINE BUILDING ROOF - Portland General Electric Company, Turbine Building, 1841 Southeast Water Street, Portland, Multnomah County, OR

404

Delayed spontaneous pneumocephalus in ventriculoperitoneal shunting: Two case reports and literature review.  

PubMed

Spontaneous pneumocephalus following cerebrospinal fluid shunt is a rare complication. In most cases, the air enters in the intracranial cavity via a skull base defect. We report 2 cases of delayed tension pneumocephalus, secondary to ventriculoperitoneal shunt, and review the etiopathogenesis, prevention and treatment of this condition. PMID:23820190

Najera Aguilar, Edinson; Castle Ramirez, Maria; Bollar Zabala, Alicia; Urculo Bareño, Enrique

2014-01-01

405

Two Episodes of Ventriculoperitoneal Shunt Migration in a Patient with Idiopathic Intracranial Hypertension  

PubMed Central

Introduction. Ventriculoperitoneal shunts are often placed as treatment for refractory idiopathic intracranial hypertension. Dislodgement and migration of the distal portion of the shunt are more common in obese patients and can be difficult to detect. We report the case of a woman with two separate episodes of shunt migration into her abdominal wall. Case Presentation. We report a case of a 37-year-old female with history of obesity eventually diagnosed with idiopathic intracranial hypertension (IIH) as the cause. She failed outpatient therapy and, through neurosurgery, had a VP shunt placed for symptom control. She had subsequent development of worsened symptoms that were found to be due to shunt migration. This happened not once but twice to the same patient. Conclusion. Shunt dislodgement, migration, and subsequent failure are common in obese patients who have shunts placed for IIH. The medical provider should maintain a high index of suspicion for shunt malfunction in these patients, particularly because clinical evaluation may be challenging due to habitus.

Balakrishnan, V.; Jeanmonod, R.

2014-01-01

406

Two episodes of ventriculoperitoneal shunt migration in a patient with idiopathic intracranial hypertension.  

PubMed

Introduction. Ventriculoperitoneal shunts are often placed as treatment for refractory idiopathic intracranial hypertension. Dislodgement and migration of the distal portion of the shunt are more common in obese patients and can be difficult to detect. We report the case of a woman with two separate episodes of shunt migration into her abdominal wall. Case Presentation. We report a case of a 37-year-old female with history of obesity eventually diagnosed with idiopathic intracranial hypertension (IIH) as the cause. She failed outpatient therapy and, through neurosurgery, had a VP shunt placed for symptom control. She had subsequent development of worsened symptoms that were found to be due to shunt migration. This happened not once but twice to the same patient. Conclusion. Shunt dislodgement, migration, and subsequent failure are common in obese patients who have shunts placed for IIH. The medical provider should maintain a high index of suspicion for shunt malfunction in these patients, particularly because clinical evaluation may be challenging due to habitus. PMID:24829841

Balakrishnan, V; Jeanmonod, R

2014-01-01

407

Creation of transcatheter aortopulmonary and cavopulmonary shunts using magnetic catheters: feasibility study in swine.  

PubMed

Surgical shunts are the basic form of palliation for many types of congenital heart disease. The Glenn shunt (superior cavopulmonary connection) and central shunt (aortopulmonary connection) represent surgical interventions that could potentially be accomplished by transcatheter techniques. We sought to investigate the efficacy of using neodymium iron boron (NdFeB) magnetic catheters to create transcatheter cavopulmonary and aortopulmonary shunts. NdFeB magnets were machined and integrated into catheters. "Target" catheters were placed in the pulmonary arteries (PAs), and radiofrequency "perforation" catheters were placed in either the descending aorta (DAo) for central shunts or the superior vena cava (SVC) for Glenn shunts. The magnet technique or "balloon target" method was used to pass wires from the DAo or the SVC into the PA. Aortopulmonary and cavopulmonary connections were then created using Atrium iCAST covered stents. Magnet catheters were used to perforate the left pulmonary artery from the DAo, thereby establishing a transcatheter central shunt. Given the orientation of the vasculature, magnetic catheters could not be used for SVC-to-PA connections; however, perforation from the SVC to the right pulmonary artery was accomplished with a trans-septal needle and balloon target. Transcatheter Glenn or central shunts were successfully created in four swine. PMID:19365662

Levi, Daniel S; Danon, Saar; Gordon, Brent; Virdone, Nicky; Vinuela, Fernando; Shah, Sanjay; Carman, Greg; Moore, John W

2009-05-01

408

Pruritus possibly associated with a portosystemic shunt in a bichon frise puppy  

PubMed Central

A bichon frise puppy was presented with generalized pruritus. At 22 weeks, a portosystemic shunt was diagnosed. Correction of the shunt led to resolution of the pruritus. Pruritus associated with hepatobiliary disease is well documented in humans; this case suggests that hepatobiliary disease may be associated with pruritus in dogs.

Waisglass, Stephen E.; Gillick, Avery; Cockshutt, Joanne; Hall, Jan A.

2006-01-01

409

PSCAD\\/EMTDC simulation of unified series-shunt compensator for power quality improvement  

Microsoft Academic Search

This paper deals with the simulation of a unified series-shunt compensator (USSC) aimed at examining its capability in improving power quality in a power distribution systems. The USSC simulation model comprises of two 12-pulse inverters which are connected in series and in shunt to the system. A generalized sinusoidal pulse width modulation switching technique is developed in the proposed controller

M. A. Hannan; Azah Mohamed

2005-01-01

410

Comparison of controllers for power quality improvement employing shunt active filter  

Microsoft Academic Search

In this paper, an implementation of shunt active filter for current harmonics compensation in order to achieve power quality improvement under non linear load condition is proposed. Shunt active filter makes the source current almost sinusoidal under non linear load condition by eliminating current harmonics. Controller generates the reference current and it is compared with actual current. PWM current controller

M. Muthazhagi; N. Senthil Kumar

2012-01-01

411

Ac-dc transfer standard shunts for frequencies up to 1 MHz  

Microsoft Academic Search

A new type of coaxial shunt for high frequency ac-dc current transfer standards has been designed. The structure of the shunts with nominal current from 100 mA to 5 A are made of a disk with two coaxial conductive layers in one side. SMD resistors are soldered in parallel between the two layers. Two conductive screens are applied in both

U. Pogliano; C. G. Bosco; M. Lanzillotti; D Serazio

412

The value of colour Doppler imaging in assessing flow through ventriculo-peritoneal shunts.  

PubMed

So far, Doppler ultrasonography has had little application in paediatric neurosurgery. The incidental observation of normally invisible CSF flow from the peritoneal end of a ventriculo-peritoneal (V-P) shunt on colour Doppler during a conventional abdominal ultrasound examination in one of our patients suggested that colour Doppler imaging might be of potential interest. Using a 10-5 MHz broad-band linear array transducer, conventional 2D and Doppler (spectral and colour-coded) ultrasonography was performed in 17 patients with V-P shunts, who were aged 3 months to 12 years. In all, 20 examinations were performed, because 2 patients had repeat examinations before and after shunt revision. In 13 examinations (65%) CSF flow was identified through the shunt tube. Flow velocities between 5 and 7 cm/s were measured. No flow was seen in 7 examinations (35%), 3 of which (15%) were performed before revisions for a blocked shunt. Further in vitro studies with simulated shunt/ventricular system model demonstrated that although clear CSF is not ultrasonically visible, the presence of particulate matter, such as choroid plexus debris, can generate a satisfactory Doppler signal with the probe insonating over the length of the tubing. In the presence of clear CSF, turbulence generated at junction points of the shunt system or at the exit of the peritoneal tube can be visualised well with Doppler ultrasonography, presumably due to generation of microbubbles. The clinical implications for the management of shunt obstruction are discussed. PMID:8891363

Sgouros, S; John, P; Walsh, A R; Hockley, A D

1996-08-01

413

Effect of shunt resistance and reverse saturation current on the performance of solar cells  

Microsoft Academic Search

A study of the solar cell model concerning the effect of shunt resistance (Rsh) and the reverse saturation current (IO ) on the performance of solar cells is presented. It is found that an upper bound for the fill factor determines the maximum attainable efficiency. Also, there is a shunt value after which the model behaves independently of the value

Z. Kamiel; M. Tayel; M. Elbanna; A. Nasser

1996-01-01

414

Electric arc furnace power quality improvement using shunt active filter and series inductor  

Microsoft Academic Search

This paper presents an investigation of power quality problems arising from electric arc furnace (EAF) operation, and the required compensating system capabilities. It also proposes a compensation system using a shunt active filter and a series inductor. A shunt active filter compensates for the reactive power and the current harmonics of the highly varying load. Reference signals for the compensation

Ahmad Esfandiari; Mostafa Parniani

2004-01-01

415

Localization of shunts across the floating junction of DSBC solar cells by lock-in thermography  

Microsoft Academic Search

The passivation that is provided by a floating junction (FJ) is degraded by any shunts that occur across the FJ. In double-sided buried-contact (DSBC) solar cells, shunts have been suspected to occur at various locations of the FJ: at pinholes in the insulating oxide, tunnel currents near the rear fingers, and at the cell edges. However, there has not been

O. Breitenstein; M. Langenkamp; K. R. McIntosh; C. B. Honsberg; M. Rinio

2000-01-01

416

An investigation of the effect and nature of shunts in aSi solar cells  

Microsoft Academic Search

Shunted cell and module segments cause a reduction in initial efficiency and yield, and can also lead to increased degradation. Shunts in small area (0.25 cm2) cells are apparently the result of a number of small defects which are grouped together in fields and are hypothesized to be linked to imperfections in the tin oxide. The defects which are active

M. Bennett; J. Newton; C. Poplawski; T. McMahon

1993-01-01

417

Shunt imaging in solar cells using low cost commercial liquid crystal sheets  

Microsoft Academic Search

A simple low cost set-up to determine the location of shunts in solar cells has been developed. Our manual system can reproducibly detect all major shunts in large area reverse biased solar cells at a rate of 1 cell every 12 seconds and allows therefore the imaging of large numbers of cells in a short time. The system is based

C. Ballif; S. Peters; J. Isenberg; S. Riepe; D. Borchert

2002-01-01

418

Right ventricle–pulmonary artery shunt in first-stage palliation of hypoplastic left heart syndrome  

Microsoft Academic Search

ObjectivePulmonary overcirculation through a systemic-pulmonary shunt has been one of the major causes of early death after the Norwood procedure. To avoid this lethal complication, we constructed a right ventricle–pulmonary shunt in first-stage palliation of hypoplastic left heart syndrome.

Shunji Sano; Kozo Ishino; Masaaki Kawada; Sadahiko Arai; Shingo Kasahara; Tomohiro Asai; Zen-ichi Masuda; Mamoru Takeuchi; Shin-ichi Ohtsuki

2003-01-01

419

EMTP simulation of a STATCOM-Shunts-OLTC coordination for local voltage control  

Microsoft Academic Search

This paper proposes coordinative control method between STATCOM installed within substation and other reactive power resources including shunt reactors and shunt capacitors and OLTC. Voltage\\/reactive power control has various difficult aspects to control because of analysis and system dynamics error. This coordinative control method suggests practical algorithm regarding system voltage and reactive power status which is easy to implement in

K. S. Jeong; Y. S. Baek; J. S. Yoon; B. H. Chang; H. C. Lee; G. J. Lee

2009-01-01

420

Linezolid for the Treatment of a Heteroresistant Staphylococcus aureus Shunt Infection  

Microsoft Academic Search

The emergence of multidrug-resistant bacteria as the cause of ventriculoperitoneal shunt infections is a disconcerting phenomenon that often requires the use of alternative antimicrobials due to resistance against commonly used agents. The following is a case report describing the successful treatment of a ventriculoperitoneal shunt infection caused by a heteroresistant strain of Staphylococcus aureus with linezolid. Linezolid may have utility

Aaron M. Cook; Christian N. Ramsey; Craig A. Martin; Thomas Pittman

2005-01-01

421

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

NASA Astrophysics Data System (ADS)

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.

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

2009-07-01

422

A current-flowing electromagnetic shunt damper for multi-mode vibration control of cantilever beams  

NASA Astrophysics Data System (ADS)

In this paper, a multi-mode electromagnetic shunt damper employing the current-flowing method is newly developed for the semi-active vibration control of flexible structures. The electromagnetic shunt damper, which is used for the electromagneto-mechanical coupling transduction between vibrating structures and the electrical shunt circuit, consists of a coil and a permanent magnet. The conducting coil is attached to the cantilever beams and the two ends of the coil are connected to the current-flowing shunt circuit for the reduction of vibration. For the analytical and experimental validation of the multi-mode electromagnetic shunt damper, the first two modes of the cantilever beam are semi-actively controlled. In light of the frequency responses, the vibration and damping characteristics of the flexible beams with the electromagnetic shunt damper are investigated with reference to changes in the circuit parameters. Also, the time responses of the integrated systems with an initial condition are experimentally examined for validation of the proposed damper. The effect of the magnetic intensity on the shunt damping is studied by varying the gap between the aluminum beam and the permanent magnet. The theoretical prediction of the frequency response of the electromagneto-mechanically coupled beams shows good agreement with the experimental results. The present results show that the current-flowing electromagnetic shunt damper can be successfully applied to reduce the multi-mode vibration of flexible structures.

Cheng, Tai-Hong; Oh, Il-Kwon

2009-09-01

423

A modal strain energy approach to the prediction of resistively shunted piezoceramic damping  

Microsoft Academic Search

The use of piezoceramic materials with resistive shunting circuits has previously been shown to increase passive structural vibration damping. The ability to tailor the frequency dependence of damping is especially attractive when active linear time-invariant control of uncertain structures is to be attempted. A method for predicting the damping performance of resistively shunted piezoceramics based on a variation of the

C. L. Davis; G. A. Lesieutre

1995-01-01

424

THE EFFECT OF ARTIFICIALLY REDUCING THE SIZE OF INDUCTORS IN PIEZOELECTRIC SHUNT DAMPING  

Microsoft Academic Search

Connecting a passive electrical network to a structurally attached piezoelectric transducer is referred to as passive shunt damping. Current shunt circuit designs, e.g. a single mode L¡R network, typically require large inductance values of up to thousands of Henries. In practice, discrete inductors are limited in size to around 1 H: By placing an additional capacitance across the terminals of

A. J. FlemingS; O. R. Moheimani

425

Comparison of low-frequency piezoelectric switching shunt techniques for structural damping  

Microsoft Academic Search

In this paper, the performances of two novel low-frequency piezoelectric switching shunt techniques for structural damping are compared to the traditional passive tuned resonant shunt circuit technique. The first novel technique, state switching, is a semi-active variable stiffness technique in which bonded piezoelectric elements are switched from the short circuit to open circuit states. This technique changes the stiffness of

Lawrence R. Corr; William W. Clark

2002-01-01

426

Multimodal passive vibration control of sandwich beams with shunted shear piezoelectric materials  

Microsoft Academic Search

This work presents a performance analysis of multimodal passive vibration control of a sandwich beam using shear piezoelectric materials, embedded in a sandwich beam core, connected to independent resistive shunt circuits. Shear piezoelectric actuators were recently shown to be more interesting for higher frequencies and stiffer structures. In particular, for shunted damping, it was shown that equivalent material loss factors

M A Trindade; C E B Maio

2008-01-01

427

Vibration suppression of HDD spindle-disk system using piezoelectric shunt damping  

Microsoft Academic Search

This work presents the feasibility of the piezoelectric shunt damping for vibration suppression of the rotating HDD disk-spindle system. A target vibration mode which significantly restricts the recording density increment of the drive is determined through modal analysis and a piezoelectric bimorph is designed to suppress unwanted vibration. The shunt circuit is constructed by considering two-dimensional electromechanical coupling coefficient of

Seung-Bok Choi; Soo-Cheol Lim; Young-Pil Park

2005-01-01

428

Comparison of low-frequency piezoceramic shunt techniques for structural damping  

Microsoft Academic Search

In this paper, the performances of two novel low frequency piezoceramic shunt techniques for structural damping are compared to the traditional passive tuned resonant shunt circuit techinque. The first novel technique, state switching, is a semi-active variable stiffness technique in which bonded piezoceramic actuators are switched from the short circuit to open circuit states. This technique changes the stiffness of

Lawrence R. Corr; William W. Clark

2001-01-01

429

Multimode vibration reduction of a CD-ROM drive base using a piezoelectric shunt circuit  

Microsoft Academic Search

This paper presents a new design methodology for the piezoelectric shunt damping system and applies to the multimode vibration suppression of a CD-ROM drive base. Admittance is introduced to predict the performance of the piezoelectric shunt damping. Numerical admittance obtained by commercial finite element code, ANSYS, is compared with experimentally measured one and the effectiveness of the model is verified.

Seung-Bok Choi; Heung Soo Kim; Jong-Sung Park

2007-01-01

430

Outlet fenestration for isolated fourth ventricle with and without an internal shunt  

Microsoft Academic Search

Conventional shunting of isolated fourth ventricle is notorious for leading to frequent and severe complications. We present four patients with isolated fourth ventricle who have been treated with open posterior fossa surgery together with either outlet fenestration alone or outlet fenestration and a fourth ventricle-spinal subarachnoid space (SSS) shunt. A survey of the relevant literature did not yield any other

Carmen Dollo; Andrew Kanner; Vitaly Siomin; Liat Ben-Sira; Jacob Sivan; Shlomo Constantini

2001-01-01

431

The role of angiography and ventriculovenous shunting in the treatment of posterior fossa tumors  

Microsoft Academic Search

Summary Angiography followed by a ventriculovenous or ventriculoperitoneal shunt is recommended as the initial procedure for patients with hydrocephalus secondary to posterior fossa tumors. With increasing regularity, the angiogram has proven to be of sufficient localizing value to warrant surgery, and the shunt has resulted in easier operative procedures and a smoother postoperative course. If exact localization is not afforded

J. A. Jane; B. Kaufman; F. Nulsen; D. Yashon; H. Young

1973-01-01

432

Infection of Transjugular Intrahepatic Portosystemic Shunt Devices: Three Cases and a Review of the Literature  

Microsoft Academic Search

During the past decade, transjugular intrahepatic portosystemic shunting (TIPS) has become accepted as an alternative to the surgical shunt procedure for controlling the complications of portal hypertension, yet few data exist regarding infectious complications. The records of all patients who underwent a TIPS procedure during 1992-2000 at a single university teaching hospital were analyzed retrospectively to determine the rate and

Paul K. Armstrong; Colin MacLeod

2003-01-01

433

Three-level inverter based shunt active power filter using generalized hysteresis current control method  

Microsoft Academic Search

This paper proposes a generalized hysteresis current controlled three level voltage source inverter (VSI) based single phase shunt active power filter (SAPF). The three level inverter topologies considered in this paper are H-bridge and diode clamped inverters. A generalized hysteresis current control with multiband hysteresis modulation has been used to control the voltage source inverters in the shunt active power

Shweta Gautam; Rajesh Gupta

2010-01-01

434

Surgical repair of partial anomalous pulmonary venous connection shunting from left atrium to innominate vein  

PubMed Central

Partial anomalous pulmonary venous connection (PAPVC) causes a left-to-right shunt from the anomalous pulmonary vein (PV) to a systemic vein. We report an uncommon adult case of PAPVC, in which the left upper PV drained into both the innominate vein and the left atrium (LA), demonstrating retrograde shunting from the LA to the innominate vein. The anomaly was surgically repaired.

2013-01-01

435

Intracardiac Shunt--Use of the Hydrogen-Sensitive Catheter to Clarify False Positive Diagnosis of Left-to-Right Shunt  

PubMed Central

The charts of 142 patients who had diagnostic right heart catheterization with conventional oximetry, oxygen content determinations and hydrogen electrode curve recording for left-to-right shunt were reviewed. A false positive diagnosis of surgical significance would have been made in nine patients if the hydrogen electrode had not been used. In addition, a diagnosis of left-to-right shunt could have been made at the wrong chamber level in three additional cases.

Stoike, Roger; Kuzman, William J.

1967-01-01

436

Differences in Lp(a) concentrations and apo(a) polymorphs between black and white Americans  

Microsoft Academic Search

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-

Santica M. Marcovina; John J. Albers; Ellen Wijsmant; ZuHui Zhang; Nicola H. Chapman; Hal Kennedy

437

High precision locations of LP events on Mt. Etna: Reconstruction of the fluid-filled volume  

Microsoft Academic Search

During 1991–93 at Mount Etna, long-period (LP) events occurring in swarms characterized the evolution of the eruption. The\\u000a presence of multiplets i.e. groups of events with similar waveform signatures, has been recognized within this activity.\\u000a \\u000a Traditional techniques for locating LP events do not allow obtaining reliable hypocenters, which have only succeeded in placing\\u000a earthquakes in a roughly 1 km2 area

S. Gambino

2006-01-01

438

LpA-I levels do not reflect pre beta1-HDL levels in human plasma.  

PubMed

High-density lipoprotein (HDL) containing apo A-I but no apo A-II (LpA-I) can promote cholesterol efflux from cells, while HDL containing apo A-I and apo A-II can not. Pre beta1-HDL, a minor fraction of LpA-I, is the initial acceptor of cellular cholesterol. To determine whether the pre beta1-HDL:LpA-I ratio is constant in human plasma, we measured LpA-I levels by differential electroimmunoassay, and HDL subfraction levels by nondenaturing 2-dimensional gel electrophoresis in 26 subjects. We found that the pre beta1-HDL:LpA-I ratio was higher in hypercholesterolemia (0.21+/-0.09; n = 11, P < 0.05), coronary artery disease (0.26+/-0.13; n = 5, P = 0.08) and hypertriglyceridemia (0.39+/-0.22; n = 3, P = 0.16) than in normolipidemia (0.11+/-0.03, n = 5). LpA-I levels were significantly correlated with HDL2b (r = 0.771, P=0.000001), HDL2a (r = 0.438, P < 0.01), and pre beta2-HDL levels (r = 0.496, P < 0.005) but not with pre beta1-HDL or HDL3 levels. In conclusion, the pre beta1-HDL:LpA-I ratio is not constant in human plasma. These findings strongly suggest that size distribution of LpA-I may change in various disorders. PMID:9298682

Miida, T; Inano, K; Yamaguchi, T; Tsuda, T; Okada, M

1997-09-01

439

Edge shunt passivation in silicon solar cells by chemical etching investigated by lock-in thermography and CELLO  

Microsoft Academic Search

Shunts in solar cells are often localized at the edges. Some of these edge shunts have a linear (ohmic) behavior and some of them have a non-linear (diode-like) one. At least the linear edge shunts, which are the most dangerous ones, can be removed by local etching. Two proven nondestructive techniques for shunt imaging are lock-in thermography and CELLO. Lock-in

M. H. Al Rifai; O. Breitenstein; J. P. Rakotoniaina; J. Carstensen

2003-01-01

440

Catheter interventional treatment of Sano shunt obstruction in patients following modified Norwood palliation for hypoplastic left heart syndrome  

Microsoft Academic Search

Shunts placed between the right ventricle and the pulmonary arteries, called Sano shunts, recently modified Norwood surgery\\u000a for hypoplastic left heart syndrome. Patients with Sano shunts tend to be more stable thus reducing the interstage mortality\\u000a of this still challenging complex cardiac anomaly. However, Sano shunt stenosis may develop and is a life threatening complication.\\u000a We report on our experience

Ingo Dähnert; Frank-Thomas Riede; Vit Razek; Michael Weidenbach; Ardawan Rastan; Thomas Walther; Martin Kostelka

2007-01-01

441

Transjugular Intrahepatic Portosystemic Shunts in Children with Biliary Atresia  

SciTech Connect

Purpose: We retrospectively evaluated the technical and long-term clinical results of transjugularintrahepatic portosystemic shunts (TIPS) in children with portal hypertension and biliary atresia (BA). Methods: Nine children with BA and recurrent bleeding from esophagogastric and/or intestinal varices were treated by TIPS at the age of 34-156 months and followed-up in two centers. Different types of stents were used. Results: Shunt insertion succeeded in all patients, but in two a second procedure was necessary. Seven procedures lasted more than 3 hr, mainly due to difficult portal vein puncture.Variceal bleeding ceased in all patients; however, 16 reinterventions were performed in eight patients for clinical reasons (n =11) and sonographically suspected restenosis (n =5). Four patients underwent successful liver transplantation 4-51 months after TIPS and five are in good clinical conditions 64-75 months after TIPS. Conclusions: TIPS in children with BA is technically difficult, mainly due to periportal fibrosis and small portal veins. Frequency of reinterventions seems to be higher compared with adults.

Huppert, Peter E. [Department of Diagnostic Radiology, Eberhard Karls University of Tuebingen, Hoppe-Seyler-Strasse 3, D-72076 Tuebingen (Germany); Goffette, Pierre [Department of Vascular and Interventional Radiology, St. Luc University Hospital of Brussels, Av. Hippocrate 10 UCL 10/29.42, Brussels (Belgium); Astfalk, Wolfgang [Department ofPediatric Surgery, Eberhard Karls University of Tuebingen, Hoppe-Seyler Strasse 3, D-72076 Tuebingen (Germany); Sokal, Emil M. [Department ofPediatrics, St. Luc University Hospital of Brussels, Av. Hippocrate 10 UCL 10/29.42, Brussels (Belgium); Brambs, Hans-Juergen; Schott, Ullrich; Duda, Stephan H. [Department of Diagnostic Radiology, Eberhard Karls University of Tuebingen, Hoppe-Seyler-Strasse 3, D-72076 Tuebingen (Germany); Schweizer, Paul [Department of Pediatric Surgery, Eberhard Karls University of Tuebingen, Hoppe-Seyler Strasse 3, D-72076 Tuebingen (Germany); Claussen, Claus D. [Department of Diagnostic Radiology, Eberhard Karls University of Tuebingen, Hoppe-Seyler-Strasse 3, D-72076 Tuebingen (Germany)

2002-12-15

442

Nonvascular needle and shunt placements for fetal therapy.  

PubMed Central

The nonvascular placement of needles and shunts for the in utero treatment of fetuses with fluid-filled, space-occupying anomalies has been done for about 10 years. The rationale for this approach is to attempt to prevent progressive impairment of organ function or lethal damage by early decompression. Experience has taught us that the key to success in these cases is the exclusion of associated anomalies and the use of appropriate tests to assess the residual organ function at the time of first diagnosis. In fetuses with hydrothorax, shunts can prevent pulmonary hypoplasia, and in those with obstructive uropathy, they can prevent the development of progressive lung hypoplasia and renal damage before a fetus is fully viable. In fetuses with ovarian cysts, prenatal puncture is occasionally indicated, but in those with hydrocephalus, the beneficial effect of prenatal drainage is more controversial. The catheters used for in utero placement have been improved and carry a smaller risk than open fetal surgical procedures. Images

Holzgreve, W; Evans, M I

1993-01-01

443

A new therapy for refractory partial epilepsy: current shunt.  

PubMed

A large number of epileptic patients suffer from refractory epilepsy, despite optimal treatment; thus these patients require new therapeutic approaches. Focal seizure activity is typically initiated in a fixed and localized region, which subsequently spreads to neighboring regions or more distant areas. At the initial onset of a seizure, the epileptic discharge will generate a relatively high voltage in seizure focus, and the discharge subsequently spreads to other relatively low-voltage regions. However, it is unknown whether seizure can be controlled through current shunt using a conduction microelectrode to conduct the epileptic discharge with a relatively high voltage in the seizure focus outside the brain. The current therapies for epilepsy, including drugs, resective surgery and neuromodulation, focus on inhibiting abnormal excessive or synchronous neuronal activity to control seizures; thus, the basic mechanism underlying these therapies is "inhibition". In contrast, we proposed a "conduction" mechanism, whereby a current shunt with conduction electrode is used to control seizures. To our knowledge, this therapeutic strategy has not been previously reported, and we propose that this approach might be an alternative choice for the treatment of refractory partial epilepsy in the future. PMID:23948600

Zhang, Limin; Liang, Shuli; Zhang, Guojun; Kang, Xixiong

2013-11-01

444

Transjugular Intrahepatic Portosystemic Shunt (TIPS): Current Status and Future Possibilities  

SciTech Connect

Since the insertion of the first TIPS in 1989 much has been learned about this therapeutic procedure. It has an established role for the treatment of some complications of portal hypertension: prevention of recurrent variceal bleeding and rescue of patients with acute uncontrollable variceal bleeding. In addition TIPS is useful for Budd-Chiari syndrome, refractory ascites and hepatorenal syndrome, although its specific role in these indications remains to be definitively established. However, the decrease in sinusoidal blood flow induced by TIPS can lead to the patient developing hepatic encephalopathy and liver failure in some cases. Therefore, TIPS should be used with caution in patients with very poor liver function. From a technical point of view, successful placement of TIPS is achieved in more than 98% of cases by experienced groups. At present, evaluation of TIPS dysfunction based on morphology probably leads to an overdiagnosis of this complication since most of these cases are not associated with clinical manifestations (recurrent bleeding or refractory ascites). The major disadvantage of TIPS remains its poor long-term patency requiring a mandatory surveillance program. The indicator for shunt function/malfunction should be the portosystemic pressure gradient, which is best assessed by intravascular measurements. Shunt obstructions may be prevented or reduced by the use of stent-grafts in the future.

Bilbao, Jose Ignacio [Department of Radiology, Clinica Universitaria, Facultad de Medicina, Universidad de Navarra, Avenida Pio XII no. 36, E-31008 Pamplona (Spain); Quiroga, Jorge; Herrero, Jose Ignacio [Department of Internal Medicine-Hepatology, Clinca Universitaria, Universidad de Navarra, Pamplona (Spain); Benito, Alberto [Department of Radiology, Clinica Universitaria, Facultad de Medicina, Universidad de Navarra, Avenida Pio XII no. 36, E-31008 Pamplona (Spain)

2002-08-15

445

Improved piezoelectric switch shunt damping technique using negative capacitance  

NASA Astrophysics Data System (ADS)

This paper proposes an adaptive shunt damping circuit for improved damping performance. It consists of a switched inductance-resistance network (SSDI), which is connected in parallel to a negative capacitance. This circuit is in the following called 'synchronized switching damping on negative capacitor and inductor' (SSDNCI). It combines the adaptive nature of the SSDI technique and the improved performance of a negative capacitance. By the action of the switch device, the piezoelectric element is periodically held under both states of the nonlinear shunt and therefore adapts to the frequency of excitation. The analysis in this publication is performed based on the typical assumptions of a single degree-of-freedom oscillator. The stationary charge signal and energy dissipation are derived as functions of the ratio between the negative capacitance and piezoelectric capacitance. Calculation results show that the dissipated energy grows with the negative capacitance up to the stability boundary of the system. Measurements are conducted on a clamped beam test rig to validate the theoretical results. In the operative range of the negative capacitance which is used in this research, an increase in nearly 220% in energy dissipation compared to the standard SSDI technique is achieved.

Han, Xu; Neubauer, Marcus; Wallaschek, Jörg

2013-01-01

446

Fabrication and characterization of shunted μ-SQUID  

NASA Astrophysics Data System (ADS)

In order to eliminate hysteresis, we have fabricated and characterized niobium based shunted micron size superconducting quantum interference devices (?-SQUIDs). We find a wide temperature range where these ?-SQUIDs are non-hysteretic in nature and show a very good Ic vs. B oscillations in hysteretic regime and V vs. B oscillations in non-hysteretic regime. Here we report the characteristics of a shunted- ?-SQUID (Wf38LS72D5). In this device we have achieved a large voltage modulation, in non-hysteretic regime, at various temperatures including such as 1.1 mV at 6.62 K with a transfer function V? = 7.2mV/?0. The figures within the original article PDF file, as supplied to AIP Publishing, were affected by a PDF-processing error. Consequently, the article re-flowed and pagination increased from 3 to 4 pages. This article was updated on 14 May 2014 to correct the PDF-processing error, with the scientific content remaining unchanged. Readers are advised that the replacement article PDF file contains an additional blank page to preserve the original pagination.

Kumar, Nikhil; Fournier, T.; Courtois, H.; Gupta, Anjan K.

2014-04-01

447

A High Isolation Series-Shunt RF MEMS Switch  

PubMed Central

This paper presents a wide band compact high isolation microelectromechanical systems (MEMS) switch implemented on a coplanar waveguide (CPW) with three ohmic switch cells, which is based on the series-shunt switch design. The ohmic switch shows a low intrinsic loss of 0.1 dB and an isolation of 24.8 dB at 6 GHz. The measured average pull-in voltage is 28 V and switching time is 47 ?s. In order to shorten design period of the high isolation switch, a structure-based small-signal model for the 3-port ohmic MEMS switch is developed and parameters are extracted from the measured results. Then a high isolation switch has been developed where each 3-port ohmic MEMS switch is closely located. The agreement of the measured and modeled radio frequency (RF) performance demonstrates the validity of the electrical equivalent model. Measurements of the series-shunt switch indicate an outstanding isolation of more than 40 dB and a low insertion loss of 0.35 dB from DC to 12 GHz with total chip size of 1 mm × 1.2 mm.

Yu, Yuan-Wei; Zhu, Jian; Jia, Shi-Xing; Shi, Yi

2009-01-01

448

Multimodal passive vibration control of sandwich beams with shunted shear piezoelectric materials  

NASA Astrophysics Data System (ADS)

This work presents a performance analysis of multimodal passive vibration control of a sandwich beam using shear piezoelectric materials, embedded in a sandwich beam core, connected to independent resistive shunt circuits. Shear piezoelectric actuators were recently shown to be more interesting for higher frequencies and stiffer structures. In particular, for shunted damping, it was shown that equivalent material loss factors of up to 31% can be achieved by optimizing the shunt circuit. In the present work, special attention is given to the design of multimodal vibration control through independent shunted shear piezoelectric sensors. In particular, a parametric analysis is performed to evaluate optimal configurations for a set of modes to be damped. Then, a methodology to evaluate the modal damping resulting from each shunted piezoelectric sensor is presented using the modal strain energy method. Results show that modal damping factors of 1%-2% can be obtained for three selected vibration modes.

Trindade, M. A.; Maio, C. E. B.

2008-10-01

449

Multiple Liver Abscesses Associated with Ventriculoperitoneal Shunt Infection: Case Report and Review of the Literature  

PubMed Central

Liver abscess following ventriculoperitoneal (VP) shunting occurs very rarely. We report an unusual case of multiple liver abscesses caused by Staphylococcus capitis in a 50-year-old compromised woman due to a complicating VP shunt infection. We reviewed the nine cases of VP shunt complications reported in the English literature, and speculated that the most likely pathogenetic mechanism in our case is an infected peritoneal tip that migrated to and penetrated the liver, which subsequently caused the formation of multiple liver abscesses. The patient was successfully treated with percutaneous aspiration, drainage of the abscesses, intravenous antibiotics, and shunt revision. Awareness and vigilance of the possibility of liver abscess formation caused by VP shunt infection will help establish an early accurate diagnosis and therapeutic strategy.

Yang, Tae Ki

2013-01-01

450

Experimental analysis of the benefits of shunted piezoceramics for damped and undamped structures  

NASA Astrophysics Data System (ADS)

The application of electrically shunted piezoceramic materials (PZTs), commonly known as 'smart damping materials,' for reducing noise and vibrations in damped and undamped structures is examined, using a specially designed test stand. The 'smart damping' technique used in this study involves attaching PZTs that are shunted with electrical circuits, consisting of resistors, capacitors, and inductors. The shunted PZTs are simple, do not require any external power, and can be easily and cost-effectively applied in practice. The test results indicate that the shunted PZTs can dissipate vibration energy, much the same way as adding viscoelastic damping materials to the structure, without adding any significant amount of weight to the structure. The results further indicate that the shunt circuits can be tuned to specific vibration frequencies, in the lower frequency ranges. The results presented here include a comparison between smart and passive damping materials, in terms of the noise and vibration reduction performance.

Ahmadian, Mehdi; Jeric, Kristina M.; Inman, Daniel J.

2001-07-01

451

Cavoportal hemitransposition for unrecognized spontaneous mesocaval shunt after liver transplantation: a case report.  

PubMed

Spontaneous portosystemic shunts can steal the blood away from the portal system. This may result in graft dysfunction or even loss following liver transplantation and can be sorted by shunt occlusion based on intraoperative flow measurements. Herein, we present an alternative technique with cavoportal hemitransposition performed for unrecognized spontaneous mesocaval shunt with 'portal steal' syndrome and primary graft nonfunction diagnosed first day following the transplant. This was chosen as a rescue strategy because an attempt to locate the shunt during relaparotomy was unsuccessful. As there was no improvement, emergency liver retransplantation with preservation of the cavoportal hemitransposition was performed on the fourth day after the primary transplant with good long-term outcome. We conclude that cavoportal hemitransposition during or after liver transplantation can be used to provide an adequate inflow into the donor portal vein if the shunting vessels responsible for the steal cannot be located and dealt with at surgery. PMID:23506649

Chmurowicz, Tomasz; Zasada-Cedro, Katarzyna; Wojcicki, Maciej

2013-06-01

452

Elective minimally invasive coronary artery bypass: Shunt or tournique occlusion? Assessment of a protective role of perioperative left anterior descending shunting on myocardial damage. A prospective randomized study  

PubMed Central

Background To determine impact of intraluminal-left anterior descending shunt to prevent myocardial damage in minimally invasive coronary artery bypass. Methods 38 patients were randomly assigned to external tournique occlusion (n?=?19) or intraluminal-left anterior descending shunt group (n?=?19). Blood samples for cardiac troponin T were collected at 30 minutes prior to, 6 and 24 hours after surgery. Results One patient in external tournique occlusion and two patients in intraluminal-left anterior descending shunt group were excluded from futher analysis due to preoperative cardiac troponin T level above the 99th-percentile. Postoperatively, each six patients in external tournique occlusion (33.3%) and intraluminal-left anterior descending shunt (35.3%) group were above the 99th-percentile. Two patients from each group (external tournique occlusion group 11.1% vs. intraluminal-left anterior descending shunt group 11.8%) had peak values above 10-% coeficient of variation cutoff (p?=?1). There were no significant differences in between both groups at all studied timepoints. Conclusion There was no protective effect of intraluminal shunting on myocardial damage compared to short-term tournique occlusion. It is upon the surgeon's discretion which method may preferrably be used to achieve a bloodless field in grafting of the non-occluded left anterior descending in minimally invasive coronary artery bypass.

2012-01-01

453

Vibration control of an HDD disk-spindle system utilizing piezoelectric bimorph shunt damping: I. Dynamic analysis and modeling of the shunted drive  

NASA Astrophysics Data System (ADS)

This work proposes a new piezoelectric shunt damping methodology to control the vibration of a computer hard disk drive (HDD) disk-spindle system. The first part of this work (part I) deals with dynamic modeling of the piezoelectric shunted drive, while the second part of this work (part II) covers experimental implementation of the proposed shunt circuits. In the modeling, a target vibration mode which significantly restricts the recording density increment of the drive is determined by analyzing the dynamic characteristics of the conventional drive. This is achieved by undertaking both modal testing and finite element (FE) analysis. In order to effectively suppress the unwanted vibration of the target mode, a piezoelectric bimorph is then designed and integrated to the drive by considering the mode shapes of the target vibration mode. The mechanical impedance of the shunted bimorph is derived from lamination theory and piezoelectric constitutive equations. In this derivation, the electromechanical coupling coefficient of the shunted drive is analytically incorporated with the mechanical impedance. Using the coupling coefficient, the shunt damping performance for the target vibration mode is predicted and evaluated by presenting the displacement transmissibility.

Lim, S. C.; Choi, S. B.

2007-06-01

454

A color quantization algorithm based on minimization of modified Lp norm error in a CIELAB space  

NASA Astrophysics Data System (ADS)

Color quantization algorithms are used to select a small number of colors that can accurately represent the content of a particular image. In this research, we introduce a novel color quantization algorithm which is based on the minimization of a modified Lp norm rather than the more traditional L2 norm associated with mean square error (MSE). We demonstrate that the Lp optimization approach has two advantages. First, it distributes the colors more uniformly over the regions of the image; and second, the norm's value can be used as an effective criterion for selecting the minimum number of colors necessary to achieve accurate representation of the image. One potential disadvantage of the modified Lp norm criteria is that it could increase the computation of the associated clustering methods. However, we solve this problem by introducing a two stage clustering procedure in which the first stage (pre-clustering) agglomerates the full set of pixels into a relatively large number of discrete colors; and the second stage (post-clustering) performs modified Lp norm minimization using the reduced number of discrete colors resulting from the pre-clustering step. The number of groups used in the post-clustering is then chosen to be the smallest number that achieves a selected threshold value of the normalized Lp norm. This two-stage clustering process dramatically reduces computation by merging together colors before the computationally expensive modified Lp norm minimization is applied.

Xue, Haitao; Bauer, Peter; Depalov, Dejan; Bradburn, Brent; Allebach, Jan P.; Bouman, Charles A.

2012-01-01

455

Lp(a) is not associated with diabetes but affects fibrinolysis and clot structure ex vivo.  

PubMed

Lipoprotein (a) [Lp(a)] is a low density lipoprotein (LDL) with one apolipoprotein (a) molecule bound to the apolipoprotein B-100 of LDL. Lp(a) is an independent risk factor for cardiovascular disease (CVD). However, the relationship of Lp(a) to diabetes and metabolic syndrome, both known for increased CVD risk, is controversial. In a population based study on type two diabetes mellitus (T2DM) development in women, Lp(a) plasma levels showed the well known skewed distribution without any relation to diabetes or impaired glucose tolerance. A modified clot lysis assay on a subset of 274 subjects showed significantly increased clot lysis times in T2DM subjects, despite inhibition of PAI-1 and TAFI. Lp(a) plasma levels significantly increased the maximal peak height of the clot lysis curve, indicating a change in clot structure. In this study Lp(a) is not related to the development of T2DM but may affect clot structure ex vivo without a prolongation of the clot lysis time. PMID:24937703

Månsson, Marianne; Kalies, Inge; Bergström, Göran; Schmidt, Caroline; Legnehed, Anne; Hultén, Lillemor Mattsson; Amrot-Fors, Lena; Gustafsson, David; Knecht, Wolfgang

2014-01-01

456

OMPS-LP Sensor Performance and Highlights of Release 1 Data Products  

NASA Astrophysics Data System (ADS)

The stratospheric limb profiler (LP) is part of the Ozone Mapper and Profiler Suite (OMPS) on the Suomi NPP satellite. Limb profilers provide higher vertical resolution than nadir profilers that are commonly flown on weather satellites, and better spatial sampling than occultation instruments. However, OMPS-LP differs from many limb profilers in that it measures scattered solar radiation in UV and visible to do vertical sounding rather than thermal emission. We will discuss how this creates some unique data interpretation challenges. The first public release of the OMPS-LP scientific products is scheduled for Oct 31, 2012. In this paper we will provide highlights of this dataset, discuss how the instrument has performed against the nominal specs, and how the ozone profiles from LP compare with those from Aura MLS that has been flying on NASA's EOS Aura satellite since July 2004. Though designed primarily for ozone profiles, the instrument has high sensitivity to stratospheric aerosols and ice clouds in the upper troposphere (cirrus), stratosphere (PSC) and mesosphere (PMC). Given its broad wavelength coverage LP can reliably separate aerosols from ice, and its relatively high spatial sampling allows one to capture and track volcanic and deep convective events that periodically inject aerosols into the stratosphere. These capabilities make OMPS-LP potentially an important climate sensor of this decade.

Bhartia, P. K.; Jaross, G.; Rault, D.

2012-12-01

457

Lp(a) is not associated with diabetes but affects fibrinolysis and clot structure ex vivo  

PubMed Central

Lipoprotein (a) [Lp(a)] is a low density lipoprotein (LDL) with one apolipoprotein (a) molecule bound to the apolipoprotein B-100 of LDL. Lp(a) is an independent risk factor for cardiovascular disease (CVD). However, the relationship of Lp(a) to diabetes and metabolic syndrome, both known for increased CVD risk, is controversial. In a population based study on type two diabetes mellitus (T2DM) development in women, Lp(a) plasma levels showed the well known skewed distribution without any relation to diabetes or impaired glucose tolerance. A modified clot lysis assay on a subset of 274 subjects showed significantly increased clot lysis times in T2DM subjects, despite inhibition of PAI-1 and TAFI. Lp(a) plasma levels significantly increased the maximal peak height of the clot lysis curve, indicating a change in clot structure. In this study Lp(a) is not related to the development of T2DM but may affect clot structure ex vivo without a prolongation of the clot lysis time.

Mansson, Marianne; Kalies, Inge; Bergstrom, Goran; Schmidt, Caroline; Legnehed, Anne; Hulten, Lillemor Mattsson; Amrot-Fors, Lena; Gustafsson, David; Knecht, Wolfgang

2014-01-01

458

20-A to 100-A AC-DC Coaxial Current Shunts for 100 kHz Frequency Range  

Microsoft Academic Search

The paper describes a set of four cylindrical, coaxial, ac current shunts used as the new National Research Council (NRC) working standards in the frequency range up to 100 kHz. They were designed for currents from 20 A to 100 A. At the lower current range the shunts were compared to NRC coaxial shunts built from discrete resistors. At the

P. S. Filipski; M. Boecker; M. Garcocz

2007-01-01

459

20-A to 100-A AC-DC Coaxial Current Shunts for 100kHz Frequency Range  

Microsoft Academic Search

The paper describes a set of four cylindrical coaxial ac current shunts used as the new National Research Council of Canada (NRC) working standards in the frequency range up to 100 kHz. They were designed for currents from 20 to 100 A. At the lower current range, the shunts were compared to NRC coaxial shunts built from discrete resistors. At

Piotr S. Filipski; Michael Boecker; Martin Garcocz

2008-01-01

460

Control strategy and site selection of a shunt active filter for damping of harmonic propagation in power distribution systems  

Microsoft Academic Search

This paper deals with a shunt active filter which will be installed by an electric utility, putting much emphasis on the control strategy and the best point of installation of the shunt active filter on a feeder in a power distribution system. The objective of the shunt active filter is to damp harmonic propagation, which results from harmonic resonance between

H. Akagi; Hirofumi

1997-01-01

461

Endoscopic Transtentorial Ventriculocystostomy and Cystoventriculoperitoneal Shunt in a Neonate with Dandy-Walker Malformation and Associated Aqueductal Obstruction  

Microsoft Academic Search

Objective: Shunting of the lateral ventricle and the posterior fossa cyst is the advocated surgical therapy for children with Dandy-Walker malformation (DWM) and associated aqueductal obstruction. The high rate of complications of combined shunting stimulated the authors to search for an alternative surgical solution. Clinical Presentation\\/Intervention: After transtentorial endoscopic ventriculocystostomy, a cystoventricular catheter, connected to a peritoneal shunt, was placed

Martin R. Weinzierl; Volker A. Coenen; Marcus C. Korinth; Joachim M. Gilsbach; Veit Rohde

2005-01-01

462

Gastrointestinal Cancer Surgery in Patients With a Prior Ventriculoperitoneal Shunt: The Department of Veterans Affairs Experience  

PubMed Central

ABSTRACT BACKGROUND: The estimated prevalence of hydrocephalus in all age groups is between 1% and 1.5%. Placement of a ventriculoperitoneal (VP) shunt in such patients offers them relatively normal lives. There are minimal data concerning the risk of postoperative complications in patients with shunts who undergo subsequent major visceral operations. We hypothesized that healthy adults who had VP shunts placed for acquired conditions and later underwent surgery for gastric or colon cancer would frequently have dense, shunt-related adhesions and high rates of adverse outcomes, particularly infection. METHODS: We assumed that all veterans were healthy on entry into military service. We searched national Department of Veterans Affairs databases from October 1994 through September 2003 to identify all Department of Veterans Affairs patients with shunts for acquired conditions and a curative-intent operation for stomach or colon cancer. We conducted chart reviews to determine their clinical courses. RESULTS: Five patients had codes for VP shunt, gastric cancer, and gastrectomy; 3 met our inclusion criteria. Fourteen had codes for VP shunt, colon cancer, and colectomy; 4 met our criteria. One of the evaluable gastrectomy patients had dense, shunt-related adhesions. None of the colectomy patients had notable adhesions. There were no postoperative complications in any of the seven patients. CONCLUSION: We believe this is the first report analyzing the clinical course of adults with VP shunts who later had major abdominal cancer surgery. The presence of a shunt was associated with dense adhesions in 1 (14%) of the 7 patients in this series, but not with an increased risk of postoperative complications.

Wadhwa, Shilpi; Hanna, George K.; Barina, Andrew R.; Audisio, Riccardo A.; Virgo, Katherine S.

2012-01-01

463

PFO and Right-to-Left Shunting in Patients with Obstructive Sleep Apnea  

PubMed Central

Background: Patent foramen ovale (PFO) with right-to-left shunt has a prevalence of 10% to 34% in the general population. It can cause an ischemic stroke, transient ischemic attack, and paradoxical peripheral or coronary embolization. Its influence on migraine and several other diseases and conditions is currently under debate. Attention has recently been turned to the correlation between PFO and obstructive sleep apnea. Thus far, studies on the prevalence of right-to-left shunts as a surrogate for PFO in these patients were limited by small sample sizes and the results have been conflicting. Here, we evaluate the prevalence of right-to-left shunting (RLS) through transcranial Doppler ultrasound (TCD) in a large patient group with obstructive sleep apnea (OSA). Methods: One hundred consecutive patients (mean age 59.5 y) with OSA underwent TCD with intravenous injection of agitated saline. The grading of right-to-left-shunts was in accordance with the Spencer PFO Grading Scale. Results: RLS was detected in 72 of 100 patients (72%). Thirty-four out of these 72 patients (47%) had a shunt grade I or II; 15 (21%) had a shunt Grade III or IV; and 23 (32%) had a large shunt (Grade V or V+). In 47 of 72 patients (65%), a right-to-left shunt was detectable at rest without Valsalva maneuver. Conclusion: The prevalence of a RLS in patients with OSA is high. Provided other intracardiac or pulmonary shunts were absent, the high prevalence of a RLS suggests a high prevalence of PFO in patients with OSA. Citation: Guchlerner M; Kardos P; Liss-Koch E; Franke J; Wunderlich N; Bertog S; Sievert H. PFO and right-to-left shunting in patients with obstructive sleep apnea. J Clin Sleep Med 2012;8(4):375–380.

Guchlerner, Marina; Kardos, Peter; Liss-Koch, Eva; Franke, Jennifer; Wunderlich, Nina; Bertog, Stefan; Sievert, Horst

2012-01-01

464

Revision Surgeries are Associated with Significant Increased Risk of Subsequent Cerebrospinal Fluid Shunt Infection  

PubMed Central

Background The object of this study was to determine if cerebrospinal fluid (CSF) shunt revision(s) are associated with increased risk of CSF shunt infection, after adjusting for baseline factors that contribute to infection risk. Methods This was a retrospective cohort study of 579 children ages 0 to 18 who underwent initial CSF shunt placement between 1/1/97 and 10/12/06 at a tertiary care children’s hospital. The outcome of interest was CSF shunt infection. Data for all subsequent CSF shunt revisions leading up to and including the initial CSF shunt infection, when applicable, were obtained. The likelihood of infection was determined using a 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 There were 123 children who developed infection. Baseline factors independently associated with hazard of infection included age 0 to <6 months at CSF shunt placement (HR 2.4, 95% CI: 1.02, 6.7) and myelomeningocele (HR 0.4, 95% CI: 0.2, 0.8). Controlling for baseline factors, the risk of infection after shunt revision was significantly greater than at the time of initial placement (HR 3.0, 95% CI: 1.9, 4.7), and this risk increased as numbers of revisions increased (?2 revisions HR 6.5, 95% CI: 3.6, 11.4). Conclusions While younger age is associated with increased hazard of infection, subsequent CSF shunt revision significantly increases infection risk.

Simon, Tamara D.; Whitlock, Kathryn B.; Riva-Cambrin, Jay; Kestle, John RW; Rosenfeld, Margaret; Dean, J. Michael; Holubkov, Richard; Langley, Marcie; Hamblett, Nicole Mayer

2012-01-01

465

Syringo-Subarachnoid-Peritoneal Shunt Using T-Tube for Treatment of Post-Traumatic Syringomyelia  

PubMed Central

Various surgical procedures for the treatment of post-traumatic syringomyelia have been introduced recently, but most surgical strategies have been unreliable. We introduce the concept and technique of a new shunting procedure, syringo-subarachnoid-peritoneal shunt. A 54-year-old patient presented to our hospital with a progressive impairment of motion and position sense on the right side. Sixteen years before this admission, he had been treated by decompressive laminectomy for a burst fracture of L1. On his recent admission, magnetic resonance (MR) imaging studies of the whole spine revealed the presence of a huge syrinx extending from the medulla to the L1 vertebral level. We performed a syringo-subarachnoid-peritoneal shunt, including insertion of a T-tube into the syrinx, subarachnoid space and peritoneal cavity. Clinical manifestations and radiological findings improved after the operation. The syringo-subarachnoid-peritoneal shunt has several advantages. First, fluid can communicate freely between the syrinx, the subarachnoid space, and the peritoneal cavity. Secondly, we can prevent shunt catheter from migrating because dural anchoring of the T-tube is easy. Finally, we can perform shunt revision easily, because only one arm of the T-tube is inserted into the intraspinal syringx cavity. We think that this procedure is the most beneficial method among the various shunting procedures.

Kim, Seon-Hwan; Youm, Jin-Young; Kwon, Hyon-Jo

2012-01-01

466

Evaluation of magnetostrictive shunt damper performance using Iron (Fe)-Gallium (Ga) alloy  

NASA Astrophysics Data System (ADS)

This study presents the possibility of dissipating mechanical energy with a proof-of-concept prototype magnetostrictive based shunt circuit using passive electrical components. The device consists of a polycrystalline galfenol (Fe-Ga alloy) strip bonded to a brass cantilever beam. Two brass pieces, each containing a permanent magnet, are used to mass load each end of the beam and to provide a magnetic bias field through the galfenol strip. The voltage induced in an induction coil closely wound around the cantilever beam captures the time rate of change of magnetic flux within the galfenol strip as the beam vibrates. The first bending-mode resonant frequency of the device was 69.42 Hz. To dissipate the electrical voltage from the device, a shunt circuit is attached. The effective mechanical impedance for the magnetostrictive shunt circuit is derived. The shunted model is specialized for two shunt circuits: the case of a resistor and that of a capacitance. The experimental results for both the resistive and capacitance shunt circuits validate the shunted magnetostrictive damping model for couple of cased of resistance and capacitance.

Yoo, JinHyeong; Murray, Andrew; Flatau, Alison B.

2014-04-01

467

Pediatric hydrocephalus: Does the shunt device pressure selection affect the outcome?  

PubMed Central

Aim: To compare the efficacy of low- versus medium-pressure shunts in pediatric hydrocephalus in a randomized controlled trial. Materials and Methods: Forty patients of pediatric hydrocephalus were randomized into two groups. The Chhabra differential pressure VP shunt (low or medium) was inserted in every patient. Postoperative follow-up was performed for symptomatic improvement and radiological evaluation (by sonography or computed tomography scan) for ventricle hemispheric ratio (VHR). Comparative analysis of pre- and postoperative VHR and need of redo surgery for shunt malformation were carried out to establish outcomes. Results: Nineteen patients had a low-pressure and 21 patients had a medium-pressure shunt inserted. The age of the patients ranged from 1 day to 10 years. The average preoperative VHR in group A was 55.37%, which reduced to 40% postoperatively (P = 0.00005); likewise, the pre- and postoperative VHR in group B were 61.57% and 42%, respectively, which was statistically significant (P = 0.0006). The complications of shunts and incidence of redo shunt surgery in both groups were not found to be statistically significant (P = 0.5614). Conclusions: The study found no significant difference in the outcome of patients with low- or medium-pressure shunt placement in pediatric hydrocephalus.

Sinha, Arvind; Sharma, Anuj; Gupta, Charitesh

2012-01-01

468

Routine Shunting is Safe and Reliable for Cerebral Perfusion during Carotid Endarterectomy in Symptomatic Carotid Stenosis  

PubMed Central

Background The purpose of this report is to describe the perioperative outcomes of standard carotid endarterectomy (CEA) with general anesthesia, routine shunting, and tissue patching in symptomatic carotid stenoses. Materials and Methods Between October 2007 and July 2011, 22 patients with symptomatic carotid stenosis (male/female, 19/3; mean age, 67.2±9.4 years) underwent a combined total of 23 CEAs using a standardized technique. The strict surgical protocol included general anesthesia and standard carotid bifurcation endarterectomy with routine shunting. The 8-French Pruitt-Inahara shunt was used in all the patients. Results During the ischemic time, the shunts were inserted within 2.5 minutes, and 5 patients (22.7%) revealed ischemic cerebral signals (flat wave) in electroencephalographic monitoring but recovered soon after insertion of the shunt. The mean shunting time for CEA was 59.1±10.3 minutes. There was no perioperative mortality or even minor stroke. All patients woke up in the operating room or the operative care room before being moved to the ward. One patient had difficulty swallowing due to hypoglossal nerve palsy, but had completely recovered by 1 month postsurgery. Conclusion Routine shunting is suggested to be a safe and reliable method of brain perfusion and protection during CEA in symptomatic carotid stenoses.

Kim, Tae Yun; Kim, Kyung Hwa; Kim, Min Ho; Shin, Byoung-Soo; Park, Hyun Kyu

2012-01-01

469

Cerebral fat embolism without intracardiac shunt: A novel presentation  

PubMed Central

Fat embolism syndrome (FES) is defined as an uncommon life-threatening disease process consisting of pulmonary, central nervous system (CNS), and cutaneous manifestations. The pathophysiology of this secondary injury is poorly understood. In the setting of the multiply injured patient, the diagnosis of FES is difficult to ascertain. A case report of a posttraumatic death caused by acute dissemination of diffuse fat emboli to the brain and lungs in the absence of a right-to-left heart defect after femur fracture is presented. The transesophageal echo cardiogram with bubble study failed to demonstrate an intracardiac defect or AV malformation in the lung further supporting a biochemical process. The acute decompensation of the patient within 2 h of the injury would favor mechanical emboli. Supportive care continues to be the mainstay of treatment for FES. Cerebral fat embolism should be considered in traumatically injured patients with unexplained decline in their neurologic examination. Cerebral fat embolism may occur without an intracardiac shunt.

Eriksson, Evert A; Schultz, Sarah E; Cohle, Stephen D; Post, Kenneth W

2011-01-01

470

Passively minimizing structural sound radiation using shunted piezoelectric materials.  

PubMed

Two methods are presented to determine optimal inductance and resistance values of the shunt circuit across a piezoceramic material, which is bonded to a simply supported plate in order to minimize sound radiation from the plate. The first method (DH) makes use of den Hartog's damped vibration absorber principle. The second method (SM) uses the Sherman Morrison matrix inversion theorem. The effectiveness of each method is compared with regard to minimizing total acoustic sound-power radiation and acoustic pressure at a point. Optimization algorithms and case studies are presented using a linearized model for the piezoceramic and using a nonlinear model for the piezoceramic that accounts for the inherent dielectric hysteresis. Case studies demonstrate that the second method (SM) results in superior performance, under both linear and nonlinear system assumptions. Studies also illustrate that, if the nonlinearity in the system is significant, it must be incorporated in the optimization process. PMID:14587594

Ozer, M Bulent; Royston, Thomas J

2003-10-01

471

Pregnancies after transjugular intrahepatic portosystemic shunt for noncirrhotic portal hypertension.  

PubMed

With the growing role of transjugular intrahepatic portosystemic shunt (TIPS) in the management of portal hypertension complications, a number of women of childbearing age are now being treated with TIPS. However, if pregnancy is unusual in patients with cirrhosis, it can occur in the case of noncirrhotic portal hypertension. To our knowledge, there are no data on pregnancy safety after TIPS insertion. We report the first case of a patient with noncirrhotic portal hypertension treated by TIPS who had two successful pregnancies. She presented with HIV-associated obliterative portopathy with recurrent variceal bleeding treated by TIPS. Pregnancies occurred later and progressed normally without maternal or fetal morbidity. There was no effect on TIPS patency, but only a moderate increase in the flow velocity in the portal vein, the stent, and the hepatic artery. Thus, TIPS does not seem to impair progression of pregnancy. PMID:24526236

Nicolas, Charlotte; Ferrand, Emma; d'Alteroche, Louis; Ayoub, Jean; Bastides, Frederic; Potin, Jerome; Perarnau, Jean-Marc

2014-04-01

472

Plasma cytokine concentrations in dogs with a congenital portosystemic shunt.  

PubMed

Congenital portosystemic shunts (cPSS) are a well-recognised vascular anomaly in dogs. Recent studies have shown an association between inflammation and hepatic encephalopathy (HE), which is a common clinical syndrome in dogs with a cPSS. Pro-inflammatory cytokines such as interleukin (IL)-6 and tumour necrosis factor (TNF)-? are frequently increased in the plasma of human patients with liver disease and have been implicated in the development of HE. In the current study, plasma concentrations of IL-2, IL-6, IL-8 and TNF-? were measured using a multiplex electrochemiluminescence immunoassay in 36 dogs with a cPSS and compared to 25 healthy dogs. There were no significant differences in plasma IL-2, IL-8 and TNF-? concentrations between the two groups; however, plasma concentrations of IL-6 were significantly higher in dogs with a cPSS compared to healthy dogs (P=0.02). PMID:24518641

Kilpatrick, Scott; Gow, Adam G; Foale, Rob D; Tappin, Simon W; Carruthers, Harvey; Reed, Nicola; Yool, Donald A; Woods, Samantha; Marques, Ana I; Jalan, Rajiv; Mellanby, Richard J

2014-04-01

473

Spinal dural arteriovenous shunt presenting with intramedullary hemorrhage: case report.  

PubMed

The authors report on a 49-year-old man with a thoracic spinal dural arteriovenous shunt (dAVS) in which rupture of a varix caused intramedullary hemorrhage. In the literature, patients with a thoracic dAVS predominantly present with congestive myelopathy; however, the patient featured in this report presented without increased deep tendon reflexes or muscle weakness, but instead with intermittent stabbing chest pain and paresthesia. Magnetic resonance images and angiograms demonstrated tortuous enlargement and the formation of a varix-like structure of the draining veins, features compatible with those of high-flow angiopathy. Recognition of this phenomenon is important in thoracic dAVS because intramedullary hemorrhage dramatically degrades outcome. A high index of clinical suspicion can prevent a similar case of thoracic dAVS from progressing to intramedullary hemorrhage. PMID:24409983

Narisawa, Ayumi; Endo, Toshiki; Sato, Kenichi; Watanabe, Mika; Takahashi, Akira; Tominaga, Teiji

2014-03-01

474

Management of patients with cochlear implants and ventriculoperitoneal shunts.  

PubMed

Objectives The aim of this study is to provide an overview of each device, discuss conditions that may predispose to the requirement of both devices, and consider pre- and post-operative issues arising from the co-existence of advanced technologies. In addition, relevant surgical anatomy and technique in the placement of both cochlear implant (CI) after ventriculoperitoneal shunt (VPS) and VPS after CI are reviewed. Methods Review of literature. Results Issues relevant to CI and VPS include predisposing conditions, magnetic resonance imaging compatibility, infectious risk, surgical technique, complication management, and a host of other issues. Discussion Patients with hydrocephalus and severe-to-profound hearing loss are a unique patient population with unique pre-, intra-, and post-operative issues. Thorough understanding of the indications, radiology, anatomy, technology, and potential complications can allow for these patients to achieve the full benefit of these lifechanging surgeries. PMID:24144174

Chadwick, Keith A; Moore, Jaime; Tye, Gary W; Coelho, Daniel H

2014-07-01

475

Overexpression of human low density lipoprotein receptors leads to accelerated catabolism of Lp(a) lipoprotein in transgenic mice.  

PubMed Central

Lp(a) lipoprotein purified from human plasma bound with high affinity to isolated bovine LDL receptors on nitrocellulose blots and in a solid-phase assay. Lp(a) also competed with 125I-LDL for binding to human LDL receptors in intact fibroblasts. Binding led to cellular uptake of Lp(a) with subsequent stimulation of cholesterol esterification. After intravenous injection, human Lp(a) was cleared slowly from the plasma of normal mice. The clearance was markedly accelerated in transgenic mice that expressed large amounts of LDL receptors. We conclude that the covalent attachment of apo(a) to apo B-100 in Lp(a) does not interfere markedly with the ability of apo B-100 to bind to the LDL receptor and that this receptor has the potential to play a major role in clearance of Lp(a) from the circulation of intact humans. Images

Hofmann, S L; Eaton, D L; Brown, M S; McConathy, W J; Goldstein, J L; Hammer, R E

1990-01-01

476

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

SciTech Connect

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.

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

477

Failure of peritoneal and gallbladder shunts in a child with craniopharyngioma.  

PubMed

A 1-year-old girl with craniopharyngioma required external drainage of 40-50 mL/h of cerebrospinal fluid (CSF) after biopsy and cyst fenestration. She developed CSF ascites following insertion of a ventriculoperitoneal (VP) shunt and a distended painful gallbladder following ventriculogallbladder shunt insertion. Revision to a ventriculoatrial shunt was required. This is the first time a craniopharyngioma has been reported to cause increased CSF production. The potential mechanisms of CSF overproduction and the difficulties managing the large volume of CSF in a young child are discussed. PMID:24470818

Woodfield, Julie; Magdum, Shailendra

2013-09-01

478

Mutual locking, chaos and devils staircase in two Josephson tunnel junctions with a common resistive shunt  

SciTech Connect

The authors have studied the phase-locking in a pair of individually biased, resistively and capacitively shunted Josephson junctions, coupled by a common resistive or capacitive shunt, on an analog computer. Under certain conditions locking is found to occur at all rational frequency ratios. A critical line is found in parameter space along which the steps form a complete devils staircase having a fractal dimension of 0.87. Beyond the critical line bifurcations occur on all steps following the Feigenbaum sequence to chaos. The Feigenbaum constants are recovered to a fair accuracy. Preliminary experiments with two Josephson tunnel junctions shunted on the chip by a gold-indium film are discussed.

Jensen, H.D.; Larsen, A.; Mygind, J.; Levinsen, M.T.

1989-03-01

479

Atrial shunts: presentation, investigation, and management, including recent advances in magnetic resonance imaging.  

PubMed

Atrial shunts are a common finding in both paediatric and adult populations. Recent developments in advanced imaging have widened the options for diagnosis and evaluation of such shunts. This paper reviews the various types of interatrial communications, discusses the features of clinical presentation in adults and children, and provides an overview of the clinical assessment including physical examination, electrocardiography, echocardiography, cardiac catheterisation, computed tomography, and magnetic resonance imaging. Focus will be placed on recent developments in magnetic resonance imaging that may improve the non-invasive evaluation of atrial shunts. PMID:24397877

Zvaigzne, Cheryl G; Howarth, Andrew G; Patton, David J

2014-06-01

480

Lipoprotein(a) in the chimpanzee: relationship of apo(a) phenotype to elevated plasma Lp(a) levels  

Microsoft Academic Search

Several studies have documented the presence of Lp(a) in nonhuman primates. However, data are lacking in great apes such as the chimpanzee. We have studied the quan- titative distribution of Lp(a), as well as the frequency of apo(a) phenotypes, in a population of chimpanzees living in Gabon. Monoclonal antibody 14A12, directed against human apo(a), failed to recognize chimpanzee Lp(a). Therefore,

Chantal Doucet; Thierry Huby; John Chapman; Joelle Thillet

481

Metabolic and anthropometric determinants of serum Lp(a) concentrations and Apo(a) polymorphism in a healthy Arab population  

Microsoft Academic Search

BACKGROUND: Blood lipoprotein(a) Lp(a) concentrations are an important risk factor for atherosclerosis. The basis for this atherogenic property of Lp(a) and the factors that influence its cross-population levels, however, remain poorly understood.OBJECTIVES: To investigate the relationship between serum Lp(a) and metabolic and anthropometric parameters in a healthy Kuwaiti population.DESIGN: Cross-sectional study.SUBJECTS: 177 (72 male, 105 female) randomly recruited healthy Kuwait

AO Akanji; IAR Al-Shayji; P Kumar

1999-01-01

482

Lp-PLA2 activity and PLA2G7 A379V genotype in patients with diabetes mellitus  

Microsoft Academic Search

Lipoprotein associated phospholipase A2 (Lp-PLA2) modulates low-density lipoprotein (LDL) oxidation by hydrolysing oxidised phospholipids present on particle surfaces. We investigated whether Lp-PLA2 activity and PLA2G7 A379V genotype were related to mediators of atherosclerosis in a diabetic study. Plasma Lp-PLA2 activity (taken in men only) and A379V genotype were investigated with regards to metabolic syndrome (MS), UKPDS risk score, and oxidised

P. T. E Wootton; J. W. Stephens; S. J. Hurel; H. Durand; J. Cooper; E. Ninio; S. E. Humphries; P. J. Talmud

2006-01-01

483

Detailed analysis of amplitude and recurrence times of LP activity at Mt. Etna Volcano, Italy.  

NASA Astrophysics Data System (ADS)

Long-Period (LP) events recorded on many volcanoes worldwide are thought to be associated with conduit resonance triggered by fluid flow instabilities throughout the volcano plumbing system. The rate of Long-Period activity, however, varies greatly depending on the particular volcano taken into account. At Piton de la Fournaise, for instance, LP event rate is on the order of 10 events /year, while at Mt. Etna it is not unusual to observe several thousands of events per month. This work is aimed at improving our understanding of the LP source mechanism through a statistical analysis of detailed LP catalogues. The behaviour of LP activity is compared with the empirical laws governing earthquakes recurrence (e.g., Gutenberg-Richter [GR] and Omori's laws), in order to understand what relationships, if any, exist between these two apparently different earthquake classes. In particular, we investigated the amplitude and the recurrence time of LP activity on Mt. Etna, Italy, using data from a temporary network (inter-station distance ~5km ) and a small-aperture array (inter-station distance ~50m) deployed in 2005. Some 13,000 LP events were detected in August 2005 through a short-term average/long-term average (STA/LTA) method. Directional properties of these events were obtained by applying a Plane Wave Fitting (PWF) method to data from the small array. The different directions of propagation measured for such events suggest that at least two different sources are active. From PWF alone we were not able to isolate the contribution of individual sources without ambiguity. LP signals, however, exhibit a high degree of waveform similarity, thus providing a criterion for classification / source separation. Using correlation analysis, we then grouped the events into families containing comparable waveforms. By waveforms stacking, we obtained a representative, template event for each family. These template signals were then used for a Matched-Filtering of the continuous data streams, in order to discriminate small-amplitude events previously undetected by the STA/LTA triggering method. This procedure allowed for a significant enrichment of the catalogues, from which we retrieved amplitudes and inter-event times associated with individual families. The retrieved amplitude distributions differ significantly from the GR law, and there is no clear relationship between events amplitude and recurrence times. Comparison with data from both lab experiments and numerical simulations of (i) brittle-fracturing of high-viscosity materials, and (ii) fluid flow under different regimes, are needed in order to better understand the physics governing the observed distributions. Hopefully, these steps will lead to an improved understanding of LP activity, in turn clarifying their significance in terms of eruption forecasting.

Cauchie, L.; Saccorotti, G.; Bean, C.; de Barros, L.

2012-04-01

484

Destruction of LP XM46 using the molten salt destruction process. Revision 1  

SciTech Connect

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.

Upadhye, R.S.; Watkins, B.E.

1994-04-01

485

Structural Basis for the Immunogenic Properties of the Meningococcal Vaccine Candidate LP2086*S?  

PubMed Central

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 ?-sheet and a C-terminal ?-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.

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, Desiree H. H.

2009-01-01

486

Structural Basis for the Immunogenic Properties of the Meningococcal Vaccine Candidate LP2086.  

PubMed

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

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

487

Analysis of error floor of LDPC codes under LP decoding over the BSC  

SciTech Connect

We consider linear programming (LP) decoding of a fixed low-density parity-check (LDPC) code over the binary symmetric channel (BSC). The LP decoder fails when it outputs a pseudo-codeword which is not a codeword. We propose an efficient algorithm termed the instanton search algorithm (ISA) which, given a random input, generates a set of flips called the BSC-instanton and prove that: (a) the LP decoder fails for any set of flips with support vector including an instanton; (b) for any input, the algorithm outputs an instanton in the number of steps upper-bounded by twice the number of flips in the input. We obtain the number of unique instantons of different sizes by running the ISA sufficient number of times. We then use the instanton statistics to predict the performance of the LP decoding over the BSC in the error floor region. We also propose an efficient semi-analytical method to predict the performance of LP decoding over a large range of transition probabilities of the BSC.

Chertkov, Michael [Los Alamos National Laboratory; Chilappagari, Shashi [UNIV OF AZ; Vasic, Bane [UNIV OF AZ; Stepanov, Mikhail [UNIV OF AZ

2009-01-01

488

Testing of cerebrospinal compensatory reserve in shunted and non-shunted patients: a guide to interpretation based on an observational study.  

PubMed Central

OBJECTIVE--To design a computerised infusion test to compensate for the disadvantages of Katzman's lumbar infusion method: inadequate accuracy of estimation of the resistance to cerebrospinal fluid outflow and poor predictive value in normal pressure hydrocephalus. METHODS--Accuracy was improved by intracranial pressure signal processing and model analysis for measurement of cerebrospinal compensatory variable. These include the CSF outflow resistance, brain compliance, pressure-volume index, estimated sagittal sinus pressure, CSF formation rate, and other variables. Infusion may be made into the lumbar space, ventricles, or, when assessing shunt function in vivo, the shunt chamber. RESULTS AND CONCLUSIONS--The computerised test has been used for five years in a multicentre study in 350 hydrocephalic patients of various ages, aetiologies, and states of cerebrospinal compensation. The principles of using the test to characterise different types of CSF circulatory disorders in patients presenting with ventricular dilatation, including brain atrophy and normal and high pressure hydrocephalus, are presented and illustrated. Previous studies showed a positive correlation between cerebrospinal compensatory variables and the results of shunting, but such a prediction remains difficult in idiopathic normal pressure hydrocephalus, particularly in elderly patients. The technique is helpful in the assessment of shunt malfunction, including posture-related overdrainage, over-drainage related to the nocturnal B wave activity, and proximal or distal shunt obstruction. The appendix presents an introduction of the mathematical modelling of CSF pressure volume-compensation included in computerised infusion test software. Images

Czosnyka, M; Whitehouse, H; Smielewski, P; Simac, S; Pickard, J D

1996-01-01

489

Lp stability for entropy solutions of scalar conservation laws with strict convex flux  

NASA Astrophysics Data System (ADS)

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

Adimurthi; Ghoshal, Shyam Sundar; Veerappa Gowda, G. D.

490

Assessment of the intracardiac left to right shunts with a single scintillation probe  

SciTech Connect

In order to assess the accuracy of pulmonary time-activity curves obtained at bedside with a single scintillation probe and Technetium-99m-labelled erythrocytes, pulmonary to systemic flow ratio (Qp:Qs) was calculated for radionuclide and hemodynamic investigations in 104 patients with suspected intracardiac left to right shunts. Cardiac catheterization confirmed the presence of shunts in 76 patients. Pulmonary time-activity curve was 100% sensitive, 88% specific, and 96% accurate in detecting the shunt. Correlation between the radionuclide and hemodynamic Qp:Qs was excellent (r = 0.93). Results were classified in four quantitative categories according to the Qp:Qs values. In 76 patients (73%) radionuclide and hemodynamic data fell in the same category. We conclude that radionuclide pulmonary time-activity curves generated with a scintillation probe is a reliable method in quantitative assessment of intracardiac left to right shunts.

Tendera, M.; Bartoszewski, A.; Foremny, J.; Salamon, A.; Wodniecki, J.; Malecka-Tendera, E. (Silesian Medical Academy, Zabrze (Poland))

1989-08-01

491

Multi-Mode Blade Damping Control using Shunted Piezoelectric Transducers with Active Feedback Structure.  

National Technical Information Service (NTIS)

The Structural Dynamics and. Mechanics branch (RXS) is developing smart adaptive structures to improve fan blade damping at resonances using piezoelectric (PE) transducers. In this presentation, only one shunted PE transducer was used to demonstrate activ...

B. Choi C. Morrison J. Min

2009-01-01

492

Design and test of a novel isolator with negative resistance electromagnetic shunt damping  

NASA Astrophysics Data System (ADS)

This paper proposes a negative resistance electromagnetic shunt damping vibration isolator and investigates the effectiveness of the isolator. The isolator consists of a shunt circuit and a pair of electromagnet and permanent magnets that are pasted onto a box-shaped spring. A kind of negative resistance shunt impedance is proposed to cancel the inherent resistance of the electromagnet. The electromechanical coupling coefficient and the electromagnetic damping force calculation formula are obtained by Biot-Savart’s law and Ampère’s law, respectively. A single degree of freedom system is employed to verify the performance of the proposed isolator. The governing equation is established. The performance of the proposed isolator under a half-cycle sine pulse is investigated and discussed. Experiments were carried out and the results agreed well with the numerical predictions. Both the results demonstrate that the negative resistance electromagnetic shunt damping vibration isolator could suppress vibration transmitted to the structure effectively.

Yan, Bo; Zhang, Xinong; Niu, Hongpan

2012-03-01

493

Scoliosis and hydrocephalus in myelocele patients. The effects of ventricular shunting.  

PubMed

Developmental scoliosis is a common cause of increasing disability and deformity in long-term myelocele survivors, and is believed to result from a paralytic collapsing spine. The possible etiological role of compensated hydrocephalus and hydromyelia was assessed by determining the effect of ventricular shunting on 11 myelocele patients with developmental scoliosis. After successful shunting, one patient with a 47 degrees curve continued to deteriorate. Three cases with curves greater than 60 degrees were stabilized for short periods, but eventually required spinal fusion. Seven cases with curves less than 55 degrees were improved from a mean scoliosis of 29 degrees to 13 degrees during a 20-month follow-up period. Several patients had pre-existing shunts that were found to be non-functional on shuntogram. These findings suggest that the spinal complications of hydrocephalus may be more common than previously recognized in myelocele patients and that advanced developmental scoliosis may be avoided by early recognition and ventricular shunting. PMID:430129

Hall, P; Lindseth, R; Campbell, R; Kalsbeck, J E; Desousa, A

1979-02-01

494

Use of acetazolamide to decrease cerebrospinal fluid production in chronically ventilated patients with ventriculopleural shunts.  

PubMed

Acetazolamide (ACTZ), a carbonic anhydrase inhibitor, has been shown to decrease cerebrospinal fluid (CSF) production in both in vivo and in vitro animal models. We report two children with hydrocephalus who experienced multiple shunt failures, and who had externalised ventriculostomy drains (EVD) prior to ventriculopleural shunt placement. The effects of increasing doses of ACTZ on CSF production and subsequent tolerance to ventriculopleural shunts were evaluated. The patients had a 48% and a 39% decrease in their EVD CSF output when compared to baseline with maximum ACTZ dose of 75 mg/kg/day and 50 mg/kg/day, respectively (p < 0.05). This is the first report of change in CSF volume in children after extended treatment with ACTZ. ACTZ treatment in mechanically ventilated paediatric patients with hydrocephalus may improve tolerance of ventriculopleural shunts and minimise respiratory compromise. Potassium and bicarbonate supplements are required to correct metabolic disturbances. PMID:11124792

Carrion, E; Hertzog, J H; Medlock, M D; Hauser, G J; Dalton, H J

2001-01-01

495

A Zero-Sequence Modified Admittance Relay for High-Voltage Shunt Reactor Application.  

National Technical Information Service (NTIS)

A solid-state relay designed to rapidly detect internal faults in grounded EHV shunt reactors is described. Detailed descriptions of the theory of operation, functional design, and practical development are presented with the aid of phasor, block, and sch...

L. E. Eilts

1973-01-01

496

Sodium nitroprusside compared with isoflurane-induced hypotension: the effects on brain oxygenation and arteriovenous shunting.  

PubMed

We compared sodium nitroprusside (SNP)-induced hypotension with 3% isoflurane-induced hypotension with regard to brain tissue oxygen pressure (PtO(2)), middle cerebral artery (MCA) blood flow, and cerebral arteriovenous shunting. Eight dogs were anesthetized with 1.5% isoflurane. After a craniotomy, a probe was inserted into the left frontoparietal brain cortex to mea-sure tissue gases and pH. Blood flow was measured in a secondary branch of the MCA by a flowprobe. Measurements were made during baseline 1.5% isoflurane, during 1.5% isoflurane and SNP-induced hypotension or 3% isoflurane-induced hypotension to a mean pressure of 60-65 mm Hg, and during continued treatment with SNP or 3% isoflurane with blood pressure support to baseline levels with phenylephrine. Shunting was calculated from arterial, sagittal sinus, and tissue (indicating capillary) oxygen content. During hypotension with SNP, PtO(2) decreased 50%, and shunting increased 50%. During hypotension with 3% isoflurane, PtO(2) and shunting did not change. Blood pressure support increased PtO(2) and MCA flow during both SNP and 3% isoflurane treatment. These results show that SNP is a cerebrovasodilator but that hypotension will decrease PtO(2), probably because of an increase in arteriovenous shunting and a decrease in capillary perfusion. Implications: We measured brain arteriovenous shunting and tissue oxygen pressure(PtO(2))during a 40% decrease in blood pressure induced by sodium nitroprusside (SNP)or 3% isoflurane. Large-dose isoflurane maintainedPtO(2) with no change in shunting. SNP infusion decreasedPtO(2) 50%and increased shunting 50%. This suggests that SNP-induced hypotension decreases PtO(2) because of a decrease in capillary perfusion. PMID:11429359

Hoffman, W E; Edelman, G; Ripper, R; Koenig, H M

2001-07-01

497

Evaluation of Microbial Bacterial and Fungal Diversity in Cerebrospinal Fluid Shunt Infection  

PubMed Central

Background Cerebrospinal fluid shunt infection can be recalcitrant. Recurrence is common despite appropriate therapy for the pathogens identified by culture. Improved diagnostic and therapeutic approaches are required, and culture-independent molecular approaches to cerebrospinal fluid shunt infections have not been described. Objectives To identify the bacteria and fungi present in cerebrospinal fluid from children with cerebrospinal fluid shunt infection using a high-throughput sequencing approach, and to compare those results to those from negative controls and conventional culture. Methods This descriptive study included eight children ?18 years old undergoing treatment for culture-identified cerebrospinal fluid shunt infection. After routine aerobic culture of each cerebrospinal fluid sample, deoxyribonucleic acid (DNA) extraction was followed by amplification of the bacterial 16S rRNA gene and the fungal ITS DNA region tag-encoded FLX-Titanium amplicon pyrosequencing and microbial phylogenetic analysis. Results The microbiota analyses for the initial cerebrospinal fluid samples from all eight infections identified a variety of bacteria and fungi, many of which did not grow in conventional culture. Detection by conventional culture did not predict the relative abundance of an organism by pyrosequencing, but in all cases, at least one bacterial taxon was detected by both conventional culture and pyrosequencing. Individual bacterial species fluctuated in relative abundance but remained above the limits of detection during infection treatment. Conclusions Numerous bacterial and fungal organisms were detected in these cerebrospinal fluid shunt infections, even during and after treatment, indicating diverse and recalcitrant shunt microbiota. In evaluating cerebrospinal fluid shunt infection, fungal and anaerobic bacterial cultures should be considered in addition to aerobic bacterial cultures, and culture-independent approaches offer a promising alternative diagnostic approach. More effective treatment of cerebrospinal fluid shunt infections is needed to reduce unacceptably high rates of reinfection, and this work suggests that one effective strategy may be reduction of the diverse microbiota present in infection.

Simon, Tamara D.; Pope, Christopher E.; Browd, Samuel R.; Ojemann, Jeffrey G.; Riva-Cambrin, Jay; Mayer-Hamblett, Nicole; Rosenfeld, Margaret; Zerr, Danielle M.; Hoffman, Lucas

2014-01-01