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https://www.readbyqxmd.com/read/28804874/high-frequency-jet-ventilation-for-motion-management-during-ablation-procedures-a-narrative-review
#1
REVIEW
K Galmén, P Harbut, J Freedman, J G Jakobsson
BACKGROUND: High frequency jet ventilation (HFJV) is a method of ventilation that has gained renewed interest over the recent years as it can reduce organ movement to near static conditions, thus enhancing surgical precision in minimal invasive procedures, for example, ablation procedures for atrial fibrillation and solid organ tumours. The aim of this review was to create a summary of the current evidence concerning the clinical use of HFJV for ablative procedures. METHOD: PubMed was searched for the key words high frequency ventilation and ablation January 1990-December 2016...
August 13, 2017: Acta Anaesthesiologica Scandinavica
https://www.readbyqxmd.com/read/28774059/effects-of-acoustic-modulation-and-mixed-fuel-on-flame-synthesis-of-carbon-nanomaterials-in-an-atmospheric-environment
#2
Wei-Chieh Hu, Shanti Kartika Sari, Shuhn-Shyurng Hou, Ta-Hui Lin
In this study, methane-ethylene jet diffusion flames modulated by acoustic excitation in an atmospheric environment were used to investigate the effects of acoustic excitation frequency and mixed fuel on nanomaterial formation. Acoustic output power was maintained at a constant value of 10 W, while the acoustic excitation frequency was varied (f = 0-90 Hz). The results show that the flame could not be stabilized on the port when the ethylene volume concentration (ΩE) was less than 40% at f = 10 Hz, or when ΩE = 0% (i...
November 18, 2016: Materials
https://www.readbyqxmd.com/read/28733016/interaction-between-cavitation-microbubble-and-cell-a-simulation-of-sonoporation-using-boundary-element-method-bem
#3
Xiasheng Guo, Chenliang Cai, Guangyao Xu, Yanye Yang, Juan Tu, PinTong Huang, Dong Zhang
Sonoporation has been widely accepted as a significant tool for gene delivery as well as some bio-effects like hemolysis, bringing in high demands of looking into its underlying mechanism. A two-dimensional (2D) boundary element method (BEM) model was developed to investigate microbubble-cell interaction, especially the morphological and mechanical characteristics around the close-to-bubble point (CP) on cell membrane. Based on time evolution analysis of sonoporation, detailed information was extracted from the model for analysis, including volume expansion ratio of the bubble, areal expansion ratio of the cell, jet velocity and CP displacement...
November 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28720845/pulsation-of-electrified-jet-in-capillary-microfluidics
#4
Xiong Li, Shanshan Wei, Liucheng Chen, Gang Qu, Huisheng Zhang, Zhou Liu, Liqiu Wang, Tiantian Kong, Tianfu Wang
In this work, we investigate the pulsation of an electrically charged jet surrounded by an immiscible dielectric liquid in flow-focusing capillary microfluidics. We have characterized a low-frequency large-amplitude pulsation and a high-frequency small-amplitude pulsation, respectively. The former, due to the unbalanced charge and fluid transportation is responsible for generating droplets with a broad size distribution. The latter is intrinsic and produces droplets with a relatively narrow size distribution...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28682620/new-biotechnological-microencapsulating-methodology-utilizing-individualized-gradient-screened-jet-laminar-flow-techniques-for-pancreatic-%C3%AE-cell-delivery-bile-acids-support-cell-energy-generating-mechanisms
#5
Armin Mooranian, Rebecca Negrulj, Ryu Takechi, Emma Jamieson, Grant Morahan, Hani Al-Salami
In previous studies, we developed a new technique (ionic gelation vibrational jet flow; IGVJF) in order to encapsulate pancreatic β-cells, for insulin in vivo delivery, and diabetes treatment. The fabricated microcapsules showed good morphology but limited cell functions. Thus, this study aimed to optimize the IGVJF technique, by utilizing integrated electrode tension, coupled with high internal vibration, jet-flow polymer stream rate, ionic bath-gelation concentrations, and gelation time stay. The study also utilized double inner/outer nozzle segmented-ingredient flow of microencapsulating dispersion, in order to form β-cell microcapsules...
August 7, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28667960/a-model-combustor-for-studying-a-reacting-jet-in-an-oscillating-crossflow
#6
Christopher A Fugger, Rohan M Gejji, J Enrique Portillo, Yen Yu, Robert P Lucht, William E Anderson
This paper discusses a novel model combustion experiment that was built for studying the structure and dynamics of a reacting jet in an unsteady crossflow. A natural-gas-fired dump combustor is used to generate and sustain an acoustically oscillating vitiated flow that serves as the crossflow for transverse jet injection. Unlike most other techniques that are limited in operating pressure or acoustic amplitude, this method of generating an unsteady flow field is demonstrated at a pressure of 10 atm with peak-to-peak oscillation amplitudes approaching 20% of the mean pressure...
June 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28646006/high-frequency-jet-ventilation-in-preterm-infants-is-there-still-room-for-it
#7
EDITORIAL
Mário Ferreira Carpi
No abstract text is available yet for this article.
July 2017: Respiratory Care
https://www.readbyqxmd.com/read/28607397/oscillatory-bursting-of-gel-fuel-droplets-in-a-reacting-environment
#8
Ankur Miglani, Purushothaman Nandagopalan, Jerin John, Seung Wook Baek
Understanding the combustion behavior of gel fuel droplets is pivotal for enhancing burn rates, lowering ignition delay and improving the operational performance of next-generation propulsion systems. Vapor jetting in burning gel fuel droplets is a crucial process that enables an effective transport (convectively) of unreacted fuel from the droplet domain to the flame zone and accelerates the gas-phase mixing process. Here, first we show that the combusting ethanol gel droplets (organic gellant laden) exhibit a new oscillatory jetting mode due to aperiodic bursting of the droplet shell...
June 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28588405/aeroacoustic-catastrophes-upstream-cusp-beaming-in-lilley-s-equation
#9
J T Stone, R H Self, C J Howls
The downstream propagation of high-frequency acoustic waves from a point source in a subsonic jet obeying Lilley's equation is well known to be organized around the so-called 'cone of silence', a fold catastrophe across which the amplitude may be modelled uniformly using Airy functions. Here we show that acoustic waves not only unexpectedly propagate upstream, but also are organized at constant distance from the point source around a cusp catastrophe with amplitude modelled locally by the Pearcey function. Furthermore, the cone of silence is revealed to be a cross-section of a swallowtail catastrophe...
May 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28587141/lem-characterization-of-synthetic-jet-actuators-driven-by-piezoelectric-element-a-review
#10
Matteo Chiatto, Francesco Capuano, Gennaro Coppola, Luigi de Luca
In the last decades, Synthetic jet actuators have gained much interest among the flow control techniques due to their short response time, high jet velocity and absence of traditional piping, which matches the requirements of reduced size and low weight. A synthetic jet is generated by the diaphragm oscillation (generally driven by a piezoelectric element) in a relatively small cavity, producing periodic cavity pressure variations associated with cavity volume changes. The pressured air exhausts through an orifice, converting diaphragm electrodynamic energy into jet kinetic energy...
May 26, 2017: Sensors
https://www.readbyqxmd.com/read/28527463/sub-doppler-infrared-spectroscopy-of-ch2oh-radical-in-a-slit-supersonic-jet-vibration-rotation-tunneling-dynamics-in-the-symmetric-ch-stretch-manifold
#11
Michael D Schuder, Fang Wang, Chih-Hsuan Chang, David J Nesbitt
The sub-Doppler CH-symmetric stretch (ν3) infrared absorption spectrum of a hydroxymethyl (CH2OH) radical is observed and analyzed with the radical formed in a slit-jet supersonic discharge expansion (Trot = 18 K) via Cl atom mediated H atom abstraction from methanol. The high sensitivity of the spectrometer and reduced spectral congestion associated with the cooled expansion enable first infrared spectroscopic observation of hydroxymethyl transitions from both ± symmetry tunneling states resulting from large amplitude COH torsional motion...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28433021/to-kink-or-not-a-search-for-long-chain-cumulenones-using-microwave-spectral-taxonomy
#12
Michael C McCarthy, Luyao Zou, Marie-Aline Martin-Drumel
A systematic search for carbon-chain cumulenones beyond H2C4O has been undertaken using microwave spectral taxonomy in combination with a pulsed jet discharge source. No evidence was found for the C2υ isomer of H2C5O or its longer derivatives, but HC(O)C4H, the longer variant of propynal, HC(O)CCH, was identified instead. Its rotational and leading centrifugal distortion constants have been derived to high accuracy from detection of both a- and b-type lines; those below 40 GHz were measured using a Fabry-Perot cavity, while lines between 40 and 72 GHz were recorded by double resonance techniques...
April 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28377402/assessing-initial-response-to-high-frequency-jet-ventilation-in-premature-infants-with-hypercapnic-respiratory-failure
#13
Craig R Wheeler, Craig D Smallwood, Iris O'Donnell, Daniel Gagner, Martha C Sola-Visner
BACKGROUND: High-frequency jet ventilation (HFJV) has been used in conjunction with conventional ventilation for infants with respiratory failure. We sought to identify parameters that were associated with successful application of HFJV in patients with hypercapnic respiratory failure. METHODS: A single-center, retrospective review of infants who received HFJV was conducted. Subjects were enrolled if birthweight was ≤2,000 g and capillary PCO2 was ≥55 mm Hg...
April 4, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28347790/key-considerations-on-nebulization-of-antimicrobial-agents-to-mechanically-ventilated-patients
#14
J Rello, J J Rouby, C Sole-Lleonart, J Chastre, S Blot, C E Luyt, J Riera, M C Vos, A Monsel, J Dhanani, J A Roberts
Nebulized antibiotics have an established role in patients with cystic fibrosis or bronchiectasis. Their potential benefit to treat respiratory infections in mechanically ventilated patients is receiving increasing interest. In this consensus statement of the European Society of Clinical Microbiology and Infectious Diseases, the body of evidence of the therapeutic utility of aerosolized antibiotics in mechanically ventilated patients was reviewed and resulted in the following recommendations: Vibrating-mesh nebulizers should be preferred to jet or ultrasonic nebulizers...
March 25, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28319401/using-sound-to-study-the-effect-of-frothers-on-the-breakaway-of-air-bubbles-at-an-underwater-capillary
#15
Pengbo Chu, Randolph Pax, Ronghao Li, Ray Langlois, James A Finch
Frothers, a class of surfactants, are widely employed in froth flotation to aid the generation of small bubbles. Their action is commonly explained by their ability to hinder coalescence. There are occasional references suggesting that the frother may also play a role in the initial breakup of the injected air mass. This work investigates the possible effect of the frother on breakup by monitoring air bubbles produced quasi-statically at an underwater capillary. Under this condition, breakup is isolated from coalescence and an impact of frothers on the detached bubble can be ascribed to an impact on breakup...
March 27, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28298110/near-infrared-overtone-voh-2-%C3%A2-0-spectroscopy-of-ne-h2o-clusters
#16
Michael P Ziemkiewicz, Christian Pluetzer, Michael Wojcik, Jérôme Loreau, Ad van der Avoird, David J Nesbitt
Vibrationally state selective overtone spectroscopy and dynamics of weakly bound Ne-H2O complexes (D0((para)) = 31.67 cm(-1), D0((ortho)) = 34.66 cm(-1)) are reported for the first time, based on near infrared excitation of van der Waals cluster bands correlating with vOH = 2 ← 0 overtone transitions (|02(-)⟩←|00(+)⟩ and |02(+)⟩←|00(+)⟩) out of the ortho (101) and para (000) internal rotor states of the H2O moiety. Quantum theoretical calculations for nuclear motion on a high level ab initio potential energy surface (CCSD(T)/VnZ-f12 (n = 3,4), corrected for basis set superposition error and extrapolated to the complete basis set limit) are employed for assignment of Σ←Σ,Π←Σ, and Σ←Π infrared bands in the overtone spectra, where Σ(K = 0) and Π (K = 1) represent approximate projections (K) of the body angular momentum along the Ne-H2O internuclear axis...
March 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28253647/prediction-of-jet-mixing-noise-with-lighthill-s-acoustic-analogy-and-geometrical-acoustics
#17
Carlos R S Ilário, Mahdi Azarpeyvand, Victor Rosa, Rod H Self, Júlio R Meneghini
A computational aeroacoustics prediction tool based on the application of Lighthill's theory is presented to compute noise from subsonic turbulent jets. The sources of sound are modeled by expressing Lighthill's source term as two-point correlations of the velocity fluctuations and the sound refraction effects are taken into account by a ray tracing methodology. Both the source and refraction models use the flow information collected from a solution of the Reynolds Averaged Navier-Stokes equations with a standard k-epsilon turbulence model...
February 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28195073/effects-of-budesonide-on-the-lung-functions-inflammation-and-apoptosis-in-a-saline-lavage-model-of-acute-lung-injury
#18
D Mokra, P Kosutova, S Balentova, M Adamkov, P Mikolka, J Mokry, M Antosova, A Calkovska
Diffuse alveolar injury, edema, and inflammation are fundamental signs of acute lung injury (ALI) and acute respiratory distress syndrome (ARDS). Whereas the systemic administration of corticosteroids previously led to controversial results, this study evaluated if corticosteroids given intratracheally may improve lung functions and reduce edema formation, migration of cells into the lung and their activation in experimentally-induced ALI. In oxygen-ventilated rabbits, ALI was induced by repetitive saline lung lavage, until PaO2 decreased to < 26...
December 2016: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/28147633/a-low-power-miniaturized-dielectric-barrier-discharge-based-atmospheric-pressure-plasma-jet
#19
G Divya Deepak, N K Joshi, Dharmendra Kumar Pal, Ram Prakash
In this paper, a dielectric barrier discharge plasma based atmospheric pressure plasma jet has been generated in a floating helix and floating end ring electrode configuration using argon and helium gases. This configuration is subjected to a range of supply frequencies (10-25 kHz) and supply voltages (2-6 kV) at a fixed rate of gas flow rate (i.e., 1 l/min). The electrical characterization of the plasma jet has been carried out using a high voltage probe and current transformer. The current-voltage characteristics have been analyzed, and the consumed power has been estimated at different applied combinations for optimum power consumption at maximum jet length...
January 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28103270/cold-atmospheric-plasma-created-at-the-tip-of-an-elongated-flexible-capillary-using-low-electric-current-can-slow-the-progression-of-melanoma
#20
Y Binenbaum, G Ben-David, Z Gil, Ya Z Slutsker, M A Ryzhkov, J Felsteiner, Ya E Krasik, J T Cohen
INTRODUCTION: Cold Atmospheric Plasma Jet (CAPJ), with ion temperature close to room temperature, has tremendous potential in biomedical engineering, and can potentially offer a therapeutic option that allows cancer cell elimination without damaging healthy tissue. We developed a hand-held flexible device for the delivery of CAPJ to the treatment site, with a modified high-frequency pulse generator operating at a RMS voltage of <1.2 kV and gas flow in the range 0.3-3 l/min. The aims of our study were to characterize the CAPJ emitted from the device, and to evaluate its efficacy in elimination of cancer cells in-vitro and in-vivo...
2017: PloS One
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