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Добірка наукової літератури з теми "Ablation mechanism"

Автор: Grafiati
Опубліковано: 14 березня 2023

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Статті в журналах з теми "Ablation mechanism"

1

Han, Qiuchen, Lei Chang, Zhaoqun Sun, Jiaqi Sun, Zengyan Wei, Pingping Wang, Ziyang Xiu, Huasong Gou, Pengchao Kang, and Gaohui Wu. "Ablation Mechanism of AlSiB-C/C Composites under an Oxy-Acetylene Torch." Metals 13, no. 1 (January 12, 2023): 160. http://dx.doi.org/10.3390/met13010160.

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In order to improve the ablation resistance of C/C composites, an AlSiB alloy (mass ratio of Al/Si/B = 2:4:1) was used as a dissipative agent to fill the pores of a C/C composites matrix by reactive melt infiltration to prepare AlSiB-C/C composites. The microstructure evolution and ablation behavior of the obtained AlSiB-C/C composites (mass ratio of Al/Si/B = 2:4:1) under oxy-acetylene flame were investigated by SEM after ablating for 25 s, 50 s, 100 s and 150 s. At the beginning of the ablation process, thermal chemical erosion played a leading part. By using the heat-absorption effect of sweating and the sealing protection effect of the oxide layer, AlSiB-C/C composites significantly reduced the ablation surface temperature, and the linear ablation rate was 4.04 μm/s. With the process of ablation, thermal mechanical erosion tended to dominate. The specimen surface could not form a continuous covering of oxide film to slow down the flame scour, resulting in non-uniform ablation and further expansion of the ablation pit. The self-transpiration cooling behavior and the self-sealing of the ablation products of the dissipative agent played an important role in reducing the extent of thermal chemical erosion and preventing matrix ablation.
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2

Girin, Oleksandr G. "A hydrodynamic mechanism of meteor ablation." Astronomy & Astrophysics 621 (December 21, 2018): A3. http://dx.doi.org/10.1051/0004-6361/201629566.

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Aims. We aim to obtain an approximate analytical solution to the equations of meteoroid dynamics within the frames of the suggested mechanism of ablation due to meteoroid melt spraying. Methods. We have described the droplet breakaway of the melt in terms of hydrodynamic instability theory for the case of a shallow angle of meteoroid entry. The differential equation of meteoroid spraying was derived, together with the equation for the distribution function of sprayed particles by sizes. The latter was obtained considering two different frameworks for meteoroid motion law: empirical and theoretical. Results. The trinal problem of an ablating meteoroid is solved analytically. The approximate solution is found for the system of equations of motion, ablation and number of sprayed droplets. The latter yields the equation for the distribution function of breakaway droplets by sizes, for which the approximate solution is obtained by providing the intermediate and final number distributions. The meteoroid ablation–deceleration balance remains in the regime of dynamic ablation, when the meteoroid velocity deficit due to aerodynamic drag is negligible until the instant of almost total meteoroid destruction. The responsible “h”-criterion is found, which depends only on the physical properties of the media, so that for melts of materials with lower viscosity such as iron the balance is closer to dynamic ablation than for the stony melt. The differential equation for meteoroid spraying is derived and integrated, showing a near-linear decrease of the meteoroid radius with time. Conclusions. The proposed spraying model allows us to obtain approximate laws of meteoroid dynamics, which can serve as a base of a comprehensive study of meteor formation and evolution. The model provides intermediate and final number distributions of the breakaway droplets by sizes through direct numerical integration of the governing equations, or, alternatively, in the form of approximate relationships. The theory can be extended to the general case of a molten meteoroid entering atmosphere at an arbitrary angle.
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3

Yang, Liangjing, Chee-Kong Chui, and Stephen Chang. "Design and Development of an Augmented Reality Robotic System for Large Tumor Ablation." International Journal of Virtual Reality 8, no. 1 (January 1, 2009): 27–35. http://dx.doi.org/10.20870/ijvr.2009.8.1.2710.

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An augmented reality based robotic system is proposed for treatment of large liver tumor using multiple overlapping ablations technique. Radiofrequency ablation is a non-resection interventional procedure that minimizes invasiveness and reduces trauma. A single ablation is however limited by the ablation volume coverage. In treatment of tumor with diameter that could be 150mm or more, a single needle insertion will not create sufficient ablation coverage to destroy the entire tumor. As such, multiple insertions are required. The precision and consistency associated with robot assisted surgery coupled with direct augmented reality projection system can better facilitate such treatment. The projection system is equipped with manipulator mechanism and robotic needle insertion arm for multiple insertions and needle deployment. The prototype augmented reality surgical system was evaluated on its abilities in ablating large tumor. Virtual models of the rectangular robot for projector manipulation and robotic needle insertion device were also used to assess the effectiveness of the proposed AR design.
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4

Lippert, Thomas, J. T. Dickinson, S. C. Langford, H. Furutani, H. Fukumura, H. Masuhara, T. Kunz, and A. Wokaun. "Photopolymers designed for laser ablation – photochemical ablation mechanism." Applied Surface Science 127-129 (May 1998): 117–21. http://dx.doi.org/10.1016/s0169-4332(97)00620-x.

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Liu, Gui Min, and Bin Li. "Study on the Electrical Arc Ablation Performance of Nano-SiCW Reinforced Cu-Matrix Composites." Advanced Materials Research 228-229 (April 2011): 509–13. http://dx.doi.org/10.4028/www.scientific.net/amr.228-229.509.

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The nano-SiC whisker reinforced Cu-matrix composites (SiCw/Cu) were obtained by powder metallurgy processes. The electrical arc ablation performance of composite SiCw/Cu was compared with copper H62 through stagnation-point ablation experiments. The results indicated that the qualities of copper H62 samples decreased with the increasing of ablating current; and the qualities of SiCw/Cu samples firstly increased and then decreased with the increasing of ablating current. Ablation mechanism research indicates the ablation hole of SiCw/Cu is smaller than copper H62, but it produced micro cracks because of different thermal expansion coefficients between nano-SiC whisker and Cu-matrix. At the same time, nano-SiC whisker happens to intricate oxidation reaction during arc ablation, it can reduce Cu-matrix smelts and sprays by absorbing arc energy. The anchoring effect and protection for the copper matrix of the uniformly dispersing nano-SiC whiskers have been considered to contribute the excellent arc ablation performance of composite SiCw/Cu.
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6

Xu, Xiao Liang, and Hai Ming Huang. "A New Viewpoint on Ablation Mechanism Discrimination." Applied Mechanics and Materials 29-32 (August 2010): 1680–85. http://dx.doi.org/10.4028/www.scientific.net/amm.29-32.1680.

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The ablation is coupled with chemistry, heat and mass transfer. Based on multidisciplinary theories, the heat flow field and the ablation loss are studied with the given gaseous mixture and assumed activation energy of H2; Furthermore, the formula for impaction effect of a single particle are deduced with an elastic impact theory, by which the most dangerous attack angle can be obtained. As results prove, the most fragile part may be the convergence region in front of the throat, and then the concentration and the activation energy of H2 determine the ablation mechanism discrimination in the most fragile part.
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Dam, B., J. H. Rector, J. Johansson, J. Huijbregtse, and D. G. De Groot. "Mechanism of incongruent ablation of SrTiO3." Journal of Applied Physics 83, no. 6 (March 15, 1998): 3386–89. http://dx.doi.org/10.1063/1.367106.

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Fan, C.-M., and R. Rox-Anderson. "Endovenous laser ablation: mechanism of action." Phlebology: The Journal of Venous Disease 23, no. 5 (October 2008): 206–13. http://dx.doi.org/10.1258/phleb.2008.008049.

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Objectives The objective of this study is to review the basics of laser and established tissue response patterns to thermal injury, with specific reference to endovenous laser ablation (EVLA). This study also reviews the current theories and supporting aspects for the mechanism of action of EVLA in the treatment of superficial venous reflux. Methods The method involves the review of published literature and original investigation of histological effects of 810 nm and 980 nm wavelength EVLA on explanted blood-filled bovine saphenous vein in an in vitro system. Results The existing histological reports confirm that EVLA produces a transmural vein wall injury, typically associated with perforations and carbonization. The pattern of injury is eccentrically distributed, with maximum injury occurring along the path of laser contact. Intravenous temperature monitoring studies during EVLA have confirmed that the peak temperatures at the fibre tip exceed 1000°C, and continuous temperatures of at least 300°C are maintained in the firing zone for the majority of the procedure. Steam production during EVLA, which occurs early in the photothermolytic process when temperatures reach 100°C, accounts for only 2% of applied energy dose, and is therefore unlikely to be the primary mechanism of action of thermal injury during the procedure. Conclusion EVLA causes permanent vein closure through a high-temperature photothermolytic process at the point of contact between the vein and the laser.
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Dieleman, J., E. van de Riet, and J. C. S. Kools. "Laser Ablation Deposition: Mechanism and Application." Japanese Journal of Applied Physics 31, Part 1, No. 6B (June 30, 1992): 1964–71. http://dx.doi.org/10.1143/jjap.31.1964.

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Wang, Xiangzhi, Zhidong Liu, Mingbo Qiu, Zhiguang Hui, Zongjun Tian, and Yinhui Huang. "Mechanism of Electrical Discharge Machining Ablation." Materials and Manufacturing Processes 29, no. 11-12 (October 7, 2014): 1367–73. http://dx.doi.org/10.1080/10426914.2014.912310.

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Дисертації з теми "Ablation mechanism"

1

Lo, Ka Ming. "Laser ablation of aqueous samples at 193-nm : mechanism and applications." HKBU Institutional Repository, 2000. http://repository.hkbu.edu.hk/etd_ra/224.

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Kolloch, Mihai Andreas Jonas [Verfasser]. "Plasmon Resonances for Sub-100 nm Silicon Ablation : Quantitative Measurement and Nanometer-Scale Ablation Mechanism / Mihai Andreas Jonas Kolloch." Konstanz : Bibliothek der Universität Konstanz, 2012. http://d-nb.info/1037311949/34.

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Intini, Marques Rodrigo. "A mechanism to accelerate the late ablation in pulsed plasma thrusters." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/67314/.

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Pulsed Plasma Thrusters (PPTs) are long standing electric propulsion thrusters that are reliable, relatively simple and low cost. One of the main issues with the PPT is its poor utilization of the propellant and low efficiency. Typically only 40-60% of the propellant contributes to the production significant impulse and the efficiency is around 8%. The cause of the PPT’s poor propellant utilization is the late time ablation (LTA), which has a major impact on the efficiency. LTA is the sublimation of propellant that takes place after the main discharge, due to the propellant, usually Polytetrafluoroethylene (Teflon®), being at a temperature above its sublimation point. The LTA produces a low speed gas and macro particles that do not contribute significantly to the thrust. This work presents a way of accelerating the late time ablation by employing an additional discharge after the main discharge, in a separate pair of electrodes. A new thruster, called the two-stage pulsed plasma thruster (TS-PPT) was built and tested. This thruster has two pair of electrodes: primary and secondary. The primary is placed in contact with the propellant surface, as in a regular PPT. The secondary is placed downstream, relatively far from the propellant. A new approach, dividing the PPT thrust generation in two phases, was envisioned. The first phase is responsible for the ablation process and takes place in the first pair of electrodes. The second phase takes place in the second pair of electrodes and is responsible for the acceleration process. The phase division allowed for propellant metering and better propellant utilization. Evidence was found that a pair of electrodes placed downstream, further from the propellant surface is able to discharge in the late ablation portion of the propellant and can impart extra energy into the exhaust and improve propellant utilization. A simple analytical model was developed to predict trends. A prototype of a TS-PPT was designed and built. A vacuum facility was modified, adapted, partially designed and built. An average mass bit consumption test was carried out. A simple time-of-flight experiment revealed that the fastest portions of the plasma from the primary electrodes discharge were travelling at around 33 km/s. Several current measurements were performed and calculations of the total electrical resistance, total inductance, electromagnetic impulse bit, specific impulse, efficiency, and other parameters were calculated based on experimental data. Experimental results indicated that significant improvements in the specific impulse and efficiency are possible by utilising a two-stage PPT. Specific impulses as high as 4000s were calculated based on experimental results, indicating a better propellant utilization.
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4

Lappalainen, J. (Jyrki). "Laser-ablation deposition and characterization of polycrystalline Nd-modified Pb(Zr,Ti)O3 thin films." Doctoral thesis, University of Oulu, 1999. http://urn.fi/urn:isbn:9514254317.

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Abstract Nd-modified lead-zirconate-titanate (PNZT) thin films were deposited on MgO(100), Si(100) and Al2O3(1102) single-crystal substrates using the pulsed-laser-ablation technique with a XeCl excimer laser. The post-annealing heat-treatment technique was used for the crystallisation of the films. The structural characterization, microstructure and the chemical composition of the thin films and of the ceramic Pb0.97Nd0.02(Zr0.55Ti0.45)O3 targets after ablation were studied using x-ray diffraction, scanning electron microscopy and energy-dispersive x-ray spectroscopy, respectively. The formation of the particulates on the target surface during the ablation process and the effect of the particulates on the quality of the thin films were studied. Typically, the ferroelectric PNZT thin films for the capacitor structures were deposited at the laser-beam fluence of around 1.0 J/cm2 and annealed at the temperatures from 600 to 700 °C. The dielectric and, especially, the polarization properties and the residual macroscopic stress state of the PNZT thin films were studied. The relationship between the electrical properties of the films and the nature of the stress state was also investigated. The average growth rate of the PNZT films increased linearly with increasing laser-beam fluence above the threshold value of around 0.4 J/cm2. The composition of the PNZT films varied strongly with the deposition laser-beam fluence and annealing temperature. The phase structure of PNZT films ablated from Pb0.97Nd0.02(Zr0.55Ti0.45)O3 targets could be adjusted between tetragonal and rhombohedral structures by changing the incident laser-beam fluence on the target surface. The surface of the target after ablation was covered by the laser-cone structure and the topmost layer of the target was amorphous having TiO2 and ZrO2 structures with separate segregated lead droplets. On MgO substrates, values of the relative dielectric constant er from 430 to 560 and of the remanent polarization εr of the order of 18 μC/cm2 were achieved in PNZT films which were under a compressive stress of the order of 300 MPa. On silicon substrates, εr was around 100 and the polarization properties of the films were modest due to a strong tensile stress of the order of 400 MPa. The Poole-Frenkel conduction mechanism with the activation energy of around 0.2 eV was found responsible for the leakage conductivity in the capacitor structures with PNZT films.
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Tamura, Ayaka. "Mechanism of laser-plasma formation in water and the application to in-situ elemental analysis." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/199322.

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6

Lippert, Thomas. "Photopolymers designed for laser ablation ablation mechanisms and applications /." Zürich : ETH, Eidgenössische Technische Hochschule Zürich, Paul Scherrer Institut, Materials Development and Characterization Group, 2002. http://e-collection.ethbib.ethz.ch/show?type=habil&nr=8.

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7

Albagli, D. (Douglas). "Fundamental mechanisms of pulsed laser ablation of biological tissue." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/33521.

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Allen, Matthew Robert. "Mechanisms of impaired osteoblast function during disuse." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1056.

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Prolonged periods of non-weightbearing activity result in a significant loss of bone mass which increases the risk of fracture with the initiation of mechanical loading. The loss of bone mass is partially driven by declines in bone formation yet the mechanisms responsible for this decline are unclear. To investigate the limitations of osteoblasts during disuse, marrow ablation was superimposed on hindlimb unloaded mice. Marrow ablation is a useful model to study osteoblast functionality as new cancellous bone is rapidly formed throughout the marrow of a long bone while hindlimb unloading is the most common method used to produce skeletal unloading. The specific hypotheses of this study were aimed at determining if changes in osteoblast functionality, differentiation, and/or proliferation were compromised in non-weightbearing bone in response to a bone formation stimulus. Additionally, the influence of having compromised osteoblast functionality at the time of stimulation was assessed in non-weightbearing bones. Key outcome measures used to address these hypotheses included static and dynamic cancellous bone histomorphometry, bone densitometry, and real-time polymerase chain reaction (PCR) analyses of gene expression. The results document similar ablation-induced increases of cancellous bone in both weightbearing and unloaded animals. Similarly, there was no influence of load on ablation-induced increases in cancellous bone forming surface or mineral apposition rate. Unloading did significantly attenuate the ablation-induced increase in bone formation rate, due to reduced levels of total surface mineralization. When osteoblast functionality was compromised prior to marrow ablation, bone formation rate increases were also attenuated in ablated animals due to reduced mineralization. Additionally, increases in forming surface were attenuated as compared to unloaded animals having normal osteoblast function at the time of ablation. Collectively, these data identify mineralization as the limiting step in new bone formation during periods of disuse. The caveat, however, is that when bone formation is stimulated after a period of unloading sufficient to compromise osteoblast functionality, increases in osteoblast recruitment to the bone surface are compromised.
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9

VIDAL, JOSE T. "Desenvolvimento de um sistema opto-mecanico para micro usinagem com laser de fentossegundos." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9563.

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Made available in DSpace on 2014-10-09T12:28:05Z (GMT). No. of bitstreams: 0
Made available in DSpace on 2014-10-09T14:01:23Z (GMT). No. of bitstreams: 0
Dissertacao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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Molto, Cécile. "Understanding reaction mechanisms of electrochemical metallization processes used for silicon photovoltaic cells." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASV016.

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Pour ce travail de thèse, le dépôt électrochimique de Ni/Cu est étudié en tant qu’alternative à la sérigraphie à base de pates d’Ag et Al pour métalliser les cellules solaires en silicium cristallin. Cette technique a le potentiel d’améliorer la qualité des contacts métalliques et d’augmenter l’efficacité des cellules solaires en silicium. Les métaux utilisés étant moins coûteux, une diminution des coûts de production est envisageable. Cependant, le dépôt Ni/Cu doit être amélioré pour une application industrielle dans le domaine photovoltaïque.L’objectif de cette thèse est d’étudier les différentes étapes du procédé de dépôt de Ni/Cu sur des cellules solaires n-PERT bifaciales afin de comprendre les mécanismes physicochimiques impliqués et résoudre les différents verrous relatifs à cette technique.La première étape, qui consiste à ouvrir selectivement les couches dielectriques par ablation laser, a été optimisée en choisissant des paramètres limitant l’endommagement du silicium sous-jacent. Un mécanisme d’ablation a également été proposé. La désoxydation et l’activation au palladium du silicium, ont été étudiés dans deux milieux fluorés (HF et NaHF2). De meilleurs résultats en terme de gravure du SiOx et d’activation ont été obtenus avec NaHF2. L’inhomogénité du dépôt de nickel a soulignée l’importance de réaliser ce dépôt dans l’obscurité. Une mauvaise adhérence sur surface polie a été observée et des axes d’amélioration ont été proposés. L’impact de paramètres de recuit non adaptés sur le rendement des cellules a été étudié. Un procédé de plating Ni/Cu optimisé a été developpé et des rendements similaires aux références sérigraphiées ont été obtenus
In this thesis work, Ni/Cu electrochemical deposition (“plating”) is studied as an alternative to the mainstream screen-printing technique based on Ag and Al metallic pastes to produce industrial c-Si solar cells. Ni/Cu plating has the potential to improve the quality of metallic contacts and increase c-Si solar cell efficiency. The use of cheaper metals is a strong asset to reduce the production costs. However, Ni/Cu plating is still at an introductory phase and there are some issues to deal with.The goal of this thesis is to investigate the successive steps of Ni/Cu plating process for bifacial n-PERT c-Si solar cells and understand the physico-chemical phenomena involved to address the related issues.On the first step, laser ablation parameters have been optimized to selectively ablate the dielectric layers while limiting the impact on the underlying Si. An ablation mechanism has also been proposed. Next steps of deoxidation and Pd activation of Si surface have been studied in two fluoride media (HF and NaHF2). NaHF2 provided higher SiOx etching rates and better Si surface activation. Next, homogeneity issues of Ni electroless deposition have been found, highlighting the need to make the deposition in dark conditions. Poor adherence on polished surface has been observed and areas of improvement have been suggested. The impact of non-optimized annealing parameters on cells conversion efficiencies has been demonstrated. The Ni/Cu plating process has been improved similar efficiencies than those of screen-printed reference cells have been achieved
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Книги з теми "Ablation mechanism"

1

Miller, John C., and Richard F. Haglund, eds. Laser Ablation Mechanisms and Applications. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/bfb0048346.

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2

E, Fogarassy, and Lazare S, eds. Laser ablation of electronic materials: Basic mechanisms and applications. Amsterdam: North-Holland, 1992.

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3

International Conference on Laser Ablation (2nd 1993 Knoxville, Tenn.). Laser ablation: Mechanisms and applications-II : second international conference, Knoxville, TN, April 1993. Edited by Miller J. C. 1949-, Geohegan David B, and American Institute of Physics. New York: American Institute of Physics, 1994.

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4

1949-, Miller J. C., and Haglund R. F. 1942-, eds. Laser ablation: Mechanisms and applications : proceedings of a workshop, held in Oak Ridge, Tennessee, USA, 8-10 April, 1991. Berlin: Springer-Verlag, 1991.

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5

Wang, Paul J., Amin Al-Ahmad, Paul C. Zei, and Henry H. Hsia. Ventricular Arrhythmias and Sudden Cardiac Death: Mechanism, Ablation, and Defibrillation. Wiley & Sons, Incorporated, John, 2009.

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6

Wang, Paul J., Amin Al-Ahmad, Paul C. Zei, and Henry H. Hsia. Ventricular Arrhythmias and Sudden Cardiac Death: Mechanism, Ablation, and Defibrillation. Wiley & Sons, Limited, John, 2009.

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7

Wang, Paul J., Amin Al-Ahmad, Paul C. Zei, and Henry H. Hsia. Ventricular Arrhythmias and Sudden Cardiac Death: Mechanism, Ablation, and Defibrillation. Wiley & Sons, Incorporated, John, 2009.

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8

(Editor), John C. Miller, and David B. Geohegan (Editor), eds. Laser Ablation: Mechanism and Applications-II (Aip Conference Proceedings Series ; No 288). American Institute of Physics, 1994.

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9

Ramrakha, Punit, and Jonathan Hill, eds. Invasive electrophysiology. Oxford University Press, 2012. http://dx.doi.org/10.1093/med/9780199643219.003.0011.

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Abbreviations 542Mechanism of tachycardias 544Mechanism of arrhythmias 546The electrophysiology study 548Uses of the electrophysiology study 550Programmed ventricular stimulation 554New technologies 556Catheter ablation 558Complications of catheter ablation 560Trans-septal puncture 562Atrial arrhythmias: mechanism 564Ablation of atrial tachycardias ...
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10

Miller, John C., and Richard F. Haglund Jr. Laser Ablation: Mechanisms and Applications. Springer, 2013.

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Частини книг з теми "Ablation mechanism"

1

Weber, Sharon M., and Fred T. Lee. "Cryoablation: History, Mechanism of Action, and Guidance Modalities." In Tumor Ablation, 250–65. New York, NY: Springer New York, 2005. http://dx.doi.org/10.1007/0-387-28674-8_20.

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2

Vahedifard, Farzan, Mark Malinowski, and Krishnan Chakravarthy. "Mechanism of Action of Radiofrequency Ablation." In Essentials of Radiofrequency Ablation of the Spine and Joints, 7–29. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78032-6_2.

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3

Ilhan, Erkan, L. Brent Mitchell, and F. Russell Quinn. "Post Atrial Fibrillation Ablation Atrial Flutter: What Is the Mechanism?" In Cardiac Electrophysiology, 155–57. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-28533-3_39.

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Ciocan, Andra, Radu Elisei, Florin Graur, Emil I. Mois, Sorana D. Bolboaca, Corina Radu, Calin Vaida, and Nadim Al Hajjar. "Robot-Assisted Ablation of Liver Hepatocellular Carcinoma and Colorectal Metastases: A Systematic Review." In New Trends in Mechanism and Machine Science, 206–18. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-55061-5_24.

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Ambrosini, F., M. Arlotti, and A. Lotto. "Paroxysmal Atrial Flutter: Which Mechanism and Treatment in the Era of Catheter Ablation?" In Cardiac Arrhythmias 1995, 249–54. Milano: Springer Milan, 1996. http://dx.doi.org/10.1007/978-88-470-2223-2_49.

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Williams, Peter, and Randall W. Nelson. "On the Mechanism of Volatilization of Large Biomolecules by Pulsed Laser Ablation of Frozen Aqueous Solutions." In NATO ASI Series, 265–73. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-7926-3_32.

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Nogar, N. S., R. C. Dye, R. C. Estler, S. R. Foltyn, R. E. Muenchausen, and X. D. Wu. "Diagnostic studies of YBa2Cu3O7−δ laser ablation." In Laser Ablation Mechanisms and Applications, 1–11. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/bfb0048347.

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Venkatesan, T., Q. Li, and X. X. Xi. "Pulsed laser deposition of high temperature superconducting thin films and hetero-structure." In Laser Ablation Mechanisms and Applications, 12–15. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/bfb0048348.

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Chen, C. H., R. C. Phillips, P. W. Morrison, D. G. Hamblen, and P. R. Solomon. "In-Situ monitoring of laser ablation of superconductors." In Laser Ablation Mechanisms and Applications, 16–27. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/bfb0048349.

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Geohegan, David B. "Spectroscopic and ion probe characterization of laser produced plasmas used for thin film growth." In Laser Ablation Mechanisms and Applications, 28–37. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/bfb0048350.

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Тези доповідей конференцій з теми "Ablation mechanism"

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Miyamoto, I., T. Ooie, Y. Hirota, and H. Maruo. "Mechanism of laser ablation – Ablation process and debris formation." In ICALEO® ‘93: Proceedings of the Laser Materials Processing Conference. Laser Institute of America, 1993. http://dx.doi.org/10.2351/1.5058573.

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Karlitskaya, Natallia S., Johan Meijer, Dirk F. de Lange, and Henk Kettelarij. "Laser propulsion of microelectronic components: releasing mechanism investigation." In High-Power Laser Ablation 2006, edited by Claude R. Phipps. SPIE, 2006. http://dx.doi.org/10.1117/12.673815.

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Haglund, Jr., R. F., R. J. Belmont, D. M. Bubb, N. L. Dygert, S. L. Johnson, Jr., and K. E. Schriver. "Mechanism of resonant infrared laser vaporization of intact polymers." In High-Power Laser Ablation 2006, edited by Claude R. Phipps. SPIE, 2006. http://dx.doi.org/10.1117/12.674175.

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4

Nastoyashchii, Anatoliy F. "Mechanism of electron thermal conductivity limitation at laser ablation." In High-Power Laser Ablation 2004, edited by Claude R. Phipps. SPIE, 2004. http://dx.doi.org/10.1117/12.547127.

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5

Bazelyan, Eduard M. "Mechanism of lightning attraction and problem of lightning initiation by laser." In High-Power Laser Ablation III. SPIE, 2000. http://dx.doi.org/10.1117/12.407351.

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Murray, Kermit K., and David H. Russell. "Matrix-assisted laser desorption ionization of aerosols: The ionization mechanism." In Laser ablation: mechanisms and applications—II. AIP, 1993. http://dx.doi.org/10.1063/1.44843.

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Johnson, S. L., D. M. Bubb, K. E. Schriver, and R. F. Haglund, Jr. "On the mechanism of resonant infrared polymer ablation: the case of polystyrene." In High-Power Laser Ablation 2008, edited by Claude R. Phipps. SPIE, 2008. http://dx.doi.org/10.1117/12.786387.

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Cheng, Changrui, and Xianfan Xu. "Molecular Dynamics Study of Mechanism of Ablation Induced by a Femtosecond Laser Pulse." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-55236.

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Анотація:
In this work, molecular dynamics (MD) simulations are carried out to study femtosecond laser ablation of a metal, with an emphasis on the understanding of the mechanism of laser ablation. Theoretically, it has been shown that under intense femtosecond laser irradiation, the material can undergo a volumetric phase change process; its temperature can be close to or even above the critical point. MD simulations allow us to determine the transient temperature of the irradiated material as well as the transient thermodynamic state, which explain the mechanisms of femtosecond laser ablation.
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Lidskii, Vladimir V., Mishik A. Kazaryan, and Victor I. Sachkov. "On one mechanism of light ablation of nanostructures." In XIII International Conference on Atomic and Molecular Pulsed Lasers, edited by Andrei M. Kabanov and Victor F. Tarasenko. SPIE, 2018. http://dx.doi.org/10.1117/12.2304603.

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Cross, Peter G., and Iain D. Boyd. "Reduced Reaction Mechanism for Rocket Nozzle Ablation Simulations." In 47th AIAA Thermophysics Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-3682.

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Звіти організацій з теми "Ablation mechanism"

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Coetzee, Gerhard A., Judd Rice, and Li Jia. Androgen Receptor-Mediated Escape Mechanism from Androgen Ablation Therapy. Fort Belvoir, VA: Defense Technical Information Center, October 2008. http://dx.doi.org/10.21236/ada501983.

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2

Pollack, Alan. The Molecular Mechanism of the Supra-Additive Response of Prostate Cancer to Androgen Ablation and Radiotherapy. Fort Belvoir, VA: Defense Technical Information Center, August 1999. http://dx.doi.org/10.21236/ada377922.

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3

Coetzee, Gerhard A., Judd Rice, and Li Jia. Androgen Receptor-Mediated Escape Mechanisms from Androgen Ablation Therapy. Fort Belvoir, VA: Defense Technical Information Center, October 2006. http://dx.doi.org/10.21236/ada461600.

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Gothilf, Yoav, Roger Cone, Berta Levavi-Sivan, and Sheenan Harpaz. Genetic manipulations of MC4R for increased growth and feed efficiency in fish. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7600043.bard.

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Анотація:
The hypothalamic melanocortin system plays a central role in the regulation of food consumption and energy homeostasis in mammals. Accordingly, our working hypothesis in this project was that genetic editing of the mc4r gene, encoding Melanocortin Receptor 4 (MC4R), will enhance food consumption, feed efficiency and growth in fish. To test this hypothesis and to assess the utility of mc4r editing for the enhancement of feed efficiency and growth in fish, the following objectives were set: Test the effect of the mc4r-null allele on feeding behavior, growth, metabolism and survival in zebrafish. Generate mc4r-null alleles in tilapia and examine the consequences for growth and survival, feed efficiency and body composition. Generate and examine the effect of naturally-occurring mc4r alleles found in swordfish on feeding behavior, growth and survival in zebrafish. Define the MC4R-mediated and MC4R-independent effects of AgRP by crossing mc4r- null strains with fish lacking AgRP neurons or the agrpgene. Our results in zebrafish did not support our hypothesis. While knockout of the agrpgene or genetic ablation of hypothalamic AgRP neurons led to reduced food intake in zebrafish larvae, knockout (KO) of the mc4r gene not only did not increase the rate of food intake but even reduced it. Since Melanocortin Receptor 3 (MC3R) has also been proposed to be involved in hypothalamic control of food intake, we also tested the effectofmc3r gene KO. Again, contrary to our hypothesis, the rate of food intake decreased. The next step was to generate a double mutant lucking both functional MC3R and MC4R. Again, the double KO exhibited reduced food intake. Thus, the only manipulation within the melanocortin system that affected food intake in consistent with the expected role of the system was seen in zebrafish larvae upon agrpKO. Interestingly, despite the apparent reduced food intake in the larval stage, these fish grow to be of the same size as wildtype fish at the adult stage. Altogether, it seems that there is a compensatory mechanism that overrides the effect of genetic manipulations of the melanocortin system in zebrafish. Under Aim 3, we introduced the Xna1, XnB1l, and XnB2A mutations from the Xiphophorus MC4R alleles into the zebrafish MC4R gene. We hypothesized that these MC4R mutations would act as dominant negative alleles to increase growth by suppressing endogenous MC4R activity. When we examined the activity of the three mutant alleles, we were unable to document any inhibition of a co-transfected wild type MC4R allele, hence we did not introduce these alleles into zebrafish. Since teleost fish possess two agrpgenes we also tested the effect of KO of the agrp2 gene and ablation of the AgRP2 cells. We found that the AgRP2 system does not affect food consumption but may rather be involved in modulating the stress response. To try to apply genetic editing in farmed fish species we turned to tilapia. Injection of exogenous AgRP in adult tilapia induced significant changes in the expression of pituitary hormones. Genetic editing in tilapia is far more complicated than in zebrafish. Nevertheless, we managed to generate one mutant fish carrying a mutation in mc4r. That individual died before reaching sexual maturity. Thus, our attempt to generate an mc4r-mutant tilapia line was almost successful and indicate out non-obvious capability to generate mutant tilapia.
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Chen, Xiaole, Peng Wang, Yunquan Luo, Yi-Yu Lu, Wenjun Zhou, Mengdie Yang, Jian Chen, Zhi-Qiang Meng, and Shi-Bing Su. Therapeutic Efficacy Evaluation and Underlying Mechanisms Prediction of Jianpi Liqi Decoction for Hepatocellular Carcinoma. Science Repository, September 2021. http://dx.doi.org/10.31487/j.jso.2021.02.04.sup.

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Анотація:
Objective: The aim of this study was to assess the therapeutic effects of Jianpi Liqi decoction (JPLQD) in hepatocellular carcinoma (HCC) and explore its underlying mechanisms. Methods: The characteristics and outcomes of HCC patients with intermediate stage B who underwent sequential conventional transcatheter arterial chemoembolization (cTACE) and radiofrequency ablation (RFA) only or in conjunction with JPLQD were analysed retrospectively. The plasma proteins were screened using label-free quantitative proteomics analysis. The effective mechanisms of JPLQD were predicted through network pharmacology approach and partially verified by ELISA. Results: Clinical research demonstrated that the Karnofsky Performance Status (KPS), traditional Chinese medicine (TCM) syndrome scores, neutropenia and bilirubin, median progression-free survival (PFS), and median overall survival (OS) in HCC patients treated with JPLQD were superior to those in patients not treated with JPLQD (all P<0.05). The analysis of network pharmacology, combined with proteomics, suggested that 52 compounds targeted 80 potential targets, which were involved in the regulation of multiple signaling pathways, especially affecting the apoptosis-related pathways including TNF, p53, PI3K-AKT, and MAPK. Plasma IGFBP3 and CA2 were significantly up-regulated in HCC patients with sequential cTACE and RFA therapy treated with JPLQD than those in patients not treated with JPLQD (P<0.001). The AUC of the IGFBP3 and CA2 panel, estimated using ROC analysis for JPLQD efficacy evaluation, was 0.867. Conclusion: These data suggested that JPLQD improves the quality of life, prolongs the overall survival, protects liver function in HCC patients, and exhibits an anticancer activity against HCC. IGFBP3 and CA2 panels may be potential therapeutic targets and indicators in the efficacy evaluation for JPLQD treatment, and the effective mechanisms involved in the regulation of multiple signaling pathways, possibly affected the regulation of apoptosis.
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