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https://www.readbyqxmd.com/read/27910698/laser-induced-fluorescence-measurements-of-axial-velocity-velocity-shear-and-parallel-ion-temperature-profiles-during-the-route-to-plasma-turbulence-in-a-linear-magnetized-plasma-device
#1
S Chakraborty Thakur, K Adriany, J J Gosselin, J McKee, E E Scime, S H Sears, G R Tynan
We report experimental measurements of the axial plasma flow and the parallel ion temperature in a magnetized linear plasma device. We used laser induced fluorescence to measure Doppler resolved ion velocity distribution functions in argon plasma to obtain spatially resolved axial velocities and parallel ion temperatures. We also show changes in the parallel velocity profiles during the transition from resistive drift wave dominated plasma to a state of weak turbulence driven by multiple plasma instabilities...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910678/first-results-from-the-thomson-scattering-diagnostic-on-proto-mpex
#2
T M Biewer, S Meitner, J Rapp, H Ray, G Shaw
A Thomson scattering (TS) diagnostic has been successfully implemented on the prototype Material Plasma Exposure eXperiment (Proto-MPEX) at Oak Ridge National Laboratory. The diagnostic collects the light scattered by plasma electrons and spectroscopically resolves the Doppler shift imparted to the light by the velocity of the electrons. The spread in velocities is proportional to the electron temperature, while the total number of photons is proportional to the electron density. TS is a technique used on many devices to measure the electron temperature (Te) and electron density (ne) of the plasma...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910670/alignment-and-absolute-wavelength-calibration-of-imaging-bragg-spectrometers
#3
G Bertschinger, O Marchuk, R Barnsley
In the present and the next generation of fusion devices, imaging Bragg spectrometers are key diagnostics to measure plasma parameters in the hot core, especially ion temperature and plasma rotation. The latter quantities are routinely obtained using the Doppler-width and -shift of the emitted spectral lines, respectively. Line shift measurements require absolute accuracies Δλ/λ of about 10 ppm, where λ-is the observed wavelength. For ITER and the present fusion devices, spectral lines of He-and H-like argon, iron, and krypton as well as Ne-like tungsten are foreseen for the measurements...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910526/measurement-of-helium-like-and-hydrogen-like-argon-spectra-using-double-crystal-x-ray-spectrometers-on-east
#4
B Lyu, J Chen, R J Hu, F D Wang, Y Y Li, J Fu, Y C Shen, M Bitter, K W Hill, L F Delgado-Aparicio, N Pablant, S G Lee, M Y Ye, Y J Shi, B N Wan
A two-crystal assembly was deployed on the tangential X-ray crystal spectrometer to measure both helium-like and hydrogen-like spectra on EAST. High-quality helium-like and hydrogen-like spectra were observed simultaneously for the first time on one detector for a wide range of plasma parameters. Profiles of line-integrated core ion temperatures inferred from two spectra were consistent. Since tungsten was adopted as the upper divertor material, one tungsten line (W XLIV at 4.017 Å) on the short-wavelength side of the Lyman-α line (Lα1) was identified for typical USN discharges, which was diffracted by a He-like crystal (2d = 4...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910516/plasma-rotation-in-the-peking-university-plasma-test-device
#5
Chijie Xiao, Yihang Chen, Xiaoyi Yang, Tianchao Xu, Long Wang, Min Xu, Dong Guo, Yi Yu, Chen Lin
Some preliminary results of plasma rotations in a linear plasma experiment device, Peking University Plasma Test (PPT) device, are reported in this paper. PPT has a cylindrical vacuum chamber with 500 mm diameter and 1000 mm length, and a pair of Helmholtz coils which can generate cylindrical or cusp magnetic geometry with magnitude from 0 to 2000 G. Plasma was generated by a helicon source and the typical density is about 10(13) cm(-3) for the argon plasma. Some Langmuir probes, magnetic probes, and one high-speed camera are set up to diagnose the rotational plasmas...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910481/measurement-of-the-electron-and-ion-temperatures-by-the-x-ray-imaging-crystal-spectrometer-on-joint-texas-experimental-tokamak
#6
W Yan, Z Y Chen, W Jin, S G Lee, Y J Shi, D W Huang, R H Tong, S Y Wang, Y N Wei, T K Ma, G Zhuang
An x-ray imaging crystal spectrometer has been developed on joint Texas experimental tokamak for the measurement of electron and ion temperatures from the Kα spectra of helium-like argon and its satellite lines. A two-dimensional multi-wire proportional counter has been applied to detect the spectra. The electron and ion temperatures have been obtained from the Voigt fitting with the spectra of helium-like argon ions. The profiles of electron and ion temperatures show the dependence on electron density in ohmic plasmas...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27903032/-interventional-left-atrial-appendage-closure-in-a-patient-with-gave-syndrome
#7
Christian Fastner, Sebastian Belle, Ibrahim Akin
History and findings | A 56-year-old female with a gastric antral vascular ectasia (GAVE) suffered from recurrent episodes of upper gastrointestinal bleeding. Because of a history of a permanent atrial fibrillation (CHA2DS2-VASc score 3 points) an oral anticoagulation therapy with phenprocoumon was carried out which even worsened the bleeding frequency and intensity. A change of medication to low-molecular weight heparin did not lead to success. The frequent periods in hospital limited the patient's quality of life...
November 2016: Deutsche Medizinische Wochenschrift
https://www.readbyqxmd.com/read/27894604/evaluation-of-the-efficacy-of-therapeutic-endoscopy-in-gastrointestinal-bleeding-secondary-to-angiodysplasias
#8
J Arribas Anta, C Zaera de la Fuente, R Martín Mateos, J A González Martín, A Cañete Ruiz, D Boixeda de Miquel, A Albillos Martínez
INTRODUCTION: Gastrointestinal angiodysplasias are defined as vascular dilations that communicate capillaries and veins in the walls of the digestive tract. The clinical presentation of these lesions varies from chronic occult bleeding to severe gastrointestinal hemorrhage. AIM: The primary aim of our study was to analyze lesion location, the efficacy of therapeutic endoscopy with argon plasma coagulation, and the factors associated with rebleeding in patients with gastrointestinal angiodysplasias...
November 25, 2016: Revista de Gastroenterología de México
https://www.readbyqxmd.com/read/27866907/radiofrequency-ablation-for-intraductal-extension-of-ampullary-neoplasms
#9
Tarun Rustagi, Shayan Irani, D Nageshwar Reddy, Barham K Abu Dayyeh, Todd H Baron, Christopher J Gostout, Michael J Levy, John Martin, Bret T Petersen, Andrew Ross, Mark D Topazian
BACKGROUND AND AIMS: Extension of ampullary adenomas into the common bile duct (CBD) or pancreatic duct (PD) may be difficult to treat endoscopically. We evaluated the feasibility, safety, and efficacy of endoscopic radiofrequency ablation (RFA) in management of ampullary neoplasms with intraductal extension. METHODS: Multicenter, retrospective analysis of all patients with intraductal extension of ampullary neoplasms treated with endoscopic RFA between February 2012 and June 2015...
November 17, 2016: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/27864873/hereditary-haemorrhagic-telangiectasia-to-transplant-or-not-to-transplant-is-there-a-right-time-for-liver-transplantation
#10
Yannick D Muller, Roland Oppliger, Romain Breguet, Philippe Meyer, Laura Rubbia-Brandt, Pierre-Auguste Petignat, Thomas Harr, Eric Dayer, Jörg D Seebach
BACKGROUND & AIMS: Hereditary haemorrhagic telangiectasia is characterized by arterio-venous malformations (AVM). It frequently involves the liver without clinical symptoms, but may lead to biliary ischaemia, portal hypertension, or fatal high-output heart failure. The indication of liver transplantation is controversial. METHODS: Herein, we report the case of a 65-year-old female patient with a 'double Osler syndrome' consisting of hereditary haemorrhagic telangiectasia (HHT) and type I hereditary angioedema diagnosed at the age of 25 and 22 years respectively...
December 2016: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/27862273/effects-of-argon-plasma-coagulation-on-human-stomach-tissue-an-ex-vivo-study
#11
Eun Jeong Gong, Ji Yong Ahn, Hwoon-Yong Jung, Young Soo Park, Hee Kyong Na, Kee Wook Jung, Do Hoon Kim, Jeong Hoon Lee, Kee Don Choi, Ho June Song, Gin Hyug Lee, Jin-Ho Kim
BACKGROUND AND AIM: Argon plasma coagulation (APC) is a safe alternative treatment for gastrointestinal neoplasms and precancerous lesions. However, the extent of thermal damage after APC is difficult to predict. We investigated the effects of APC on human stomach tissue. METHODS: APC was performed on 10 freshly resected human stomachs which were obtained after total gastrectomy. The effects on tissue were compared across power settings (40, 60, and 80 W), durations (5, 10, 15, 20, and 25 s), and between injection (submucosal injection of normal saline) and control (without injection) groups...
November 14, 2016: Journal of Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/27858275/energy-recovery-from-waste-glycerol-by-utilizing-thermal-water-vapor-plasma
#12
Andrius Tamošiūnas, Pranas Valatkevičius, Dovilė Gimžauskaitė, Mejdi Jeguirim, Vladas Mėčius, Mindaugas Aikas
Glycerol, considered as a waste feedstock resulting from biodiesel production, has received much attention in recent years due to its properties, which offer to recover energy. The aim of this study was to investigate the use of a thermal water vapor plasma for waste (crude) glycerol conversion to synthesis gas, or syngas (H2 + CO). In parallel of crude glycerol, a pure glycerol (99.5%) was used as a reference material in order to compare the concentrations of the formed product gas. A direct current (DC) arc plasma torch stabilized by a mixture of argon/water vapor was utilized for the effective glycerol conversion to hydrogen-rich synthesis gas...
November 17, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27847061/endoscopic-repair-of-recurrent-tracheoesophageal-fistula-with-an-atrial-septal-occluder-device
#13
Alessandro Vivacqua, Dhananjay Malankar, Jay J Idrees, Thomas W Rice, Daniel P Raymond, Eric E Roselli
A 32-year-old woman presented with recurrent trachea-esophageal fistula. Although she had undergone open repair three times in her first year of life, a residual small leak was left. In the past 2 years she had experienced several lower respiratory tract infections and she had lost 5 kilograms in the past 2 months. Recent argon plasma coagulation cauterization and clipping of the fistula had failed, so an alternative technique with placement of an atrial septal occluder device was used to obliterate the fistula...
December 2016: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/27843428/a-rare-case-of-gastric-variceal-hemorrhage-secondary-to-infiltrative-b-cell-lymphoma
#14
Adrienne Lenhart, Juan Fernandez-Castillo, Keith Mullins, Reena Salgia
Portal hypertension commonly arises in the setting of advanced liver cirrhosis and is the consequence of increased resistance within the portal vasculature. Less commonly, left-sided noncirrhotic portal hypertension can develop in a patient secondary to isolated obstruction of the splenic vein. We present a rare case of left-sided portal hypertension and isolated gastric varices in a patient with large B-cell lymphoma, who was treated with splenic artery embolization. The patient is a 73-year-old male with no previous history of liver disease, who presented with coffee ground emesis and melena...
September 2016: Case Reports in Gastroenterology
https://www.readbyqxmd.com/read/27842831/effect-of-microwave-argon-plasma-on-the-glycosidic-and-hydrogen-bonding-system-of-cotton-cellulose
#15
S Prabhu, K Vaideki, S Anitha
Cotton fabric was processed with microwave (Ar) plasma to alter its hydrophilicity. The process parameters namely microwave power, process gas pressure and processing time were optimized using Box-Behnken method available in the Design Expert software. It was observed that certain combinations of process parameters improved existing hydrophilicity while the other combinations decreased it. ATR-FTIR spectral analysis was used to identify the strain induced in inter chain, intra chain, and inter sheet hydrogen bond and glycosidic covalent bond due to plasma treatment...
January 20, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/27836207/primary-debulking-surgery-of-the-upper-abdomen-and-the-diaphragm-with-a-plasma-device-surgery-system-for-advanced-ovarian-cancer
#16
Gloria Cordeiro Vidal, Guillaume Babin, Denis Querleu, Frédéric Guyon
OBJECTIVE: Electrically neutral argon plasma (PlasmaJet™) technology is a surgical option that helps to get an aggressive cytoreduction in selected patients with ovarian cancer because it can be directly applied by the surgeon to treat the tissue surface [1,2]. Upper abdominal surgical procedures are an important part of the surgery in these patients [3], there is a 22% complications rate when they are performed [4]. We present a surgical approach to ovarian cancer debulking using PlasmaJet™...
November 8, 2016: Gynecologic Oncology
https://www.readbyqxmd.com/read/27830096/hemorrhage-from-extra-antral-gastric-antral-vascular-ectasia-in-a-patient-with-duodenal-heterotopic-gastric-mucosa
#17
John Gubatan, Nathan Raines, Hasan Khosravi, Tracy L Challies, Tyler M Berzin
Gastric antral vascular ectasias (GAVE) have been increasingly recognized as an uncommon cause of chronic gastrointestinal bleeding and anemia, although their underlying pathogenesis is not completely well understood. Heterotopic gastric mucosa (HGM) has been reported to occur at various sites along the gastrointestinal tract and although relatively common, it is often asymptomatic. We report a case of a 60-year-old woman with a prior history of GAVE who developed melena and symptomatic anemia during her hospitalization following cardiac catheterization...
2016: Case Reports in Gastrointestinal Medicine
https://www.readbyqxmd.com/read/27812446/successful-hemostasis-and-resection-of-a-bleeding-gastric-polyp-by-endoscopic-banding-ligation-in-a-uremic-patient-taking-antiplatelet-agent
#18
Ping-I Hsu, Kwok-Hung Lai, Feng-Woei Tsay, Jin-Shiung Cheng, E-Ming Wang, Rong-Jer Lai, Tsair-Fwu Lee
The modalities to treat bleeding polyps include electrocautery snare polypectomy, adrenaline injection, clipping, argon plasma coagulation and surgery. We hereby describe an endoscopic banding ligation method for the management of bleeding gastric polyp in a patient receiving antiplatelet therapy. A 66-year-old man presented with a five month-history of intermittent tarry stool passage, nausea and fatigue. He had a past history of peripheral arterial occlusive disease and non-insulin dependent diabetes mellitus with end stage renal disease, and regularly took antiplatelet agent (ticlopidine 100 mg thrice daily) for cardiovascular prophylaxis...
2016: SpringerPlus
https://www.readbyqxmd.com/read/27811622/therapeutic-endoscopy-for-the-control-of-non-variceal-upper-gastrointestinal-bleeding-in-children-a-case-series
#19
Anna M Banc-Husu, Nuzhat A Ahmad, Vinay Chadrasekhara, Gregory G Ginsberg, David L Jaffe, Michael L Kochman, Michael Rajala, Petar Mamula
INTRODUCTION: Gastrointestinal bleeding is one of the most common indications for urgent endoscopy in the pediatric setting. The majority of these procedures are performed for control of variceal bleeding, with very few performed for non-variceal upper gastrointestinal (NVUGI) bleeding. The data on therapeutic endoscopy for NVUGI are very sparse. The aims of our study were to review our experience with NVUGI bleeding, describe technical aspects and outcomes of therapeutic endoscopy, and determine gastroenterology fellows' training opportunities according to the national training guidelines...
November 2, 2016: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/27809887/successful-endoscopic-treatment-of-stapled-j-pouch-ileoanal-canal-anastomotic-hemorrhage-by-argon-plasma-coagulation-a-case-report
#20
Takeshi Nishikawa, Keisuke Hata, Shuntaro Yoshida, Koji Murono, Koji Yasuda, Kensuke Otani, Toshiaki Tanaka, Tomomichi Kiyomatsu, Kazushige Kawai, Hiroaki Nozawa, Soichiro Ishihara, Kazuhiko Koike, Toshiaki Watanabe
BACKGROUND: Continuous lower gastrointestinal hemorrhage is a rare condition, but it often requires proper management. We report a case of a patient with gastrointestinal hemorrhage 18 years after stapled J-pouch ileoanal canal anastomosis who was successfully treated with argon plasma coagulation. CASE PRESENTATION: Our patient was a 54-year-old Japanese man who had developed ulcerative colitis 28 years ago. A J-shaped ileal pouch-anal anastomosis with a double-staple technique was indicated 18 years ago when the patient became refractory to the conventional medication...
November 3, 2016: Journal of Medical Case Reports
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