Relevant bibliographies by topics / Chemical and thermal ablation

Academic literature on the topic 'Chemical and thermal ablation'

Author: Grafiati
Published: 14 March 2023

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Journal articles on the topic "Chemical and thermal ablation"

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Xiao, Jie, Lin Jiang, and Qiang Xu. "Insight into chemical reaction kinetics effects on thermal ablation of charring material." Thermal Science, no. 00 (2021): 85. http://dx.doi.org/10.2298/tsci201010085x.

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Thermal ablation plays an important role in the aerospace field. In this paper, to study the chemical kinetics effects on heat transfer and surface ablation of the charring ablative material during aerodynamic heating, a charring ablation model was established using the finite element method. AVCOAT5026-39H/CG material, one typical thermal protection material used in thermal protection system, was employed as the ablative material and heated by aerodynamic heating condition experienced by Apollo 4. The finite element model considers the decomposition of the resin within the charring material and the removal of the surface material, and uses Darcy?s law to simulate the fluid flow in the porous char. Results showed that the model can be used for the ablation analysis of charring materials. Then effects of chemical kinetics on ablation were discussed in terms of four aspects, including temperature, surface recession, density distribution, and mass flux of pyrolysis gas. The pre-exponential factor and activation energy have different effects on ablation, while the effect of the reaction order is little. This paper is helpful to understand the heating and ablation process of charring ablative materials and to provide technical references for the selection and design of thermal protection materials.
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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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Zhang, Hao, Jinfeng Tian, Liwei Yan, Shengtai Zhou, Mei Liang, and Huawei Zou. "Improving the Ablation Properties of Liquid Silicone Rubber Composites by Incorporating Hexaphenoxycyclotriphosphonitrile." Nanomaterials 13, no. 3 (January 30, 2023): 563. http://dx.doi.org/10.3390/nano13030563.

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The ablative properties of epoxy-modified vinyl silicone rubber (EMVSR) composites containing hexaphenoxycyclotriphosphonitrile (HPCTP) have been systematically studied. The strength of the ablation char layer was greatly enhanced with the addition of HPCTP, which induced the formation of a more complete, denser, and thicker char during oxyacetylene ablation tests. Moreover, the HPCTP-containing EMVSR composites demonstrated lower thermal conductivity and pyrolysis rate when compared with those without HPTCP. At the same time, the thermal insulation properties of HPCTP-filled composites were improved under low heat flow ablation scenarios. The reduction of graphitic carbon content, the formation of phosphate-like crystals as well as the increase of SiC content contributed to strengthening the char layer, which was critical for improving the ablation properties. The optimum char layer strength and thermal insulation properties were achieved when the content of HPCTP was 15 phr, whereas an optimum ablation resistance was achieved at 25 phr HPCTP. This suggests that HPCTP-modified EMVSR composites can be used for thermal protection purposes, especially in the fields of aerospace and aeronautics.
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Gorskiy, V. V., M. G. Kovalsky, and V. G. Resh. "Method of Calculating Carbon Ablation in the Jet of Liquid Rocket Engine Combustion Products." Herald of the Bauman Moscow State Technical University. Series Mechanical Engineering, no. 5 (128) (October 2019): 4–21. http://dx.doi.org/10.18698/0236-3941-2019-5-4-21.

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Nowadays carbon materials are widely used as ablating thermal protection for high-temperature structural elements in aerospace technology. Prediction of changes in the shape of the external surfaces of these elements, due to the burning of thermal protection, is closely related to the use of computational-theoretical methods describing the flow of various physicochemical and mechanical processes associated with the occurrence of the phenomenon under consideration. At the same time, it is crucial to test such methods on the results of experimental studies conducted under conditions which are implemented during the process of testing thermal protection in jets of aerodynamic units. The main elements of ablation of carbon materials include their erosion, i.e., mechanical ablation of mass, observed in high-pressure gas flows. In the process of experimental development, it is necessary to carry out research on large-scale models, which has led to widespread use of underexpanded jets of combustion products of liquid rocket engine combustion products for modeling the erosion process of thermal protection. The theoretical model of ablation of thermal protection in such jets requires taking into account the complex chemical composition of the gas mixture flowing into the model; physical and chemical interaction of this gas with thermal protection, which causes gasification of the latter; use of mathematical models describing the process of material erosion due to mechanical impact of high-pressure gas flow. The paper describes the development of the carbon material ablation calculating and theoretical methodology which could be used to determine the material erosion characteristics on the basis of solving a complex problem of circumfluence, heating, heat penetration and ablation of thermal protection.
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Asghar, Muhammad, Nadeem Iqbal, Sadia Sagar Iqbal, Mohsin Farooq, and Tahir Jamil. "Ablation and thermo-mechanical tailoring of EPDM rubber using carbon fibers." Journal of Polymer Engineering 36, no. 7 (September 1, 2016): 713–22. http://dx.doi.org/10.1515/polyeng-2015-0337.

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Abstract Carbon fibers (CFs) are incorporated into ethylene propylene diene monomer (EPDM) rubber to fabricate charring elastomeric ablative composites for ultrahigh temperature applications. Ablation characteristics of the ablative composites were evaluated using ASTM E285-08. Variant content incorporation of short CFs in the basic composite formulation reduced the backface temperature acclivity and the ablation rate rose up to 48% and 78%, correspondingly. Thermal stability and endothermic capability were improved with increasing short fiber contents in the rubber matrix. Experimental thermal conductivity measurement results elucidate that thermal conductivity reduces 60% at 473 K with 6 wt% addition of the fibers. A remarkable improvement was scrutinized in the tensile strength and rubber hardness with increasing fiber to matrix ratio. Scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDS) analysis of the composite specimens revealed the uniform dispersion of CFs within the host matrix, formation of voids during ablation, char-reinforcement interaction and composition of the charred ablators and the impregnated fibers.
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Moskvicheva, L. I., D. V. Sidorov, M. V. Lozhkin, L. O. Petrov, and M. V. Zabelin. "Modern methods of ablation of malignant tumors of the liver." Research'n Practical Medicine Journal 5, no. 4 (December 22, 2018): 58–71. http://dx.doi.org/10.17709/2409-2231-2018-5-4-6.

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The purpose of this review is to demonstrate the possibility of performing various methods of thermal and non-thermal ablation in patients with primary and metastatic liver tumors on the basis of data available in the world medical literature.As conservative variants of local action in patients with non-resectable primary and secondary liver tumors and inoperable patients, various ablative techniques have been developed and used to achieve local control over the disease and increase the life expectancy of this group of patients. These include: radiofrequency ablation, microwave ablation, HIFU therapy, laser ablation, cryotherapy, chemical destruction of the tumor, irreversible electroporation, stereotactic radiation therapy.The effectiveness of these ablation methods depends on the size and localization of the tumor focus, and for thermal techniques — also on its location relative to large vessels. Ablative techniques have the maximum efficiency (in some cases, similar to surgical intervention) when exposed to early forms of primary cancer or secondary tumor formation of the liver in the presence of a solitary node with a maximum size up to 5 cm or 3 and less foci size up to 3 cm. The effectiveness of local destruction of tumor formations of the liver of larger diameter is increased by carrying out ablation by the second stage after performing chemoembolization of the hepatic artery or by combining various techniques of local action.The use of various modern methods of ablation of solid primary and secondary liver tumors in medical practice can expand the possibilities of antitumor treatment of this category of patients.
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Li, Weijie, Haiming Huang, and Xiaoliang Xu. "A coupled thermal/fluid/chemical/ablation method on surface ablation of charring composites." International Journal of Heat and Mass Transfer 109 (June 2017): 725–36. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.02.052.

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PENG, YAJING, YINGHUI WANG, BRUNO PALPANT, XING HE, XIANXU ZHENG, and YANQIANG YANG. "MODELING HEAT-INDUCED CHEMICAL REACTION IN NANOTHERMITES EXCITED BY PULSE LASER: A HOT SPOT MODEL." International Journal of Modern Physics B 24, no. 03 (January 30, 2010): 381–95. http://dx.doi.org/10.1142/s0217979210055135.

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A hot spot model, involving interaction of pulse laser with nanoparticles where heat diffusion and exothermic chemical reaction are considered and spread out of heat and chemical reaction, is developed to model the thermal reaction dynamic process of Al/NC (nitrocellulose) nanothermites excited by pulse laser for the purpose of verifying the experimental ablation criterion proposed recently and providing a microscopic insight into different physical pathways leading to ablation. In this model, the spatial position and conversion of matters taking place in chemical reactions are regarded as the functions of time, space, and temperature. An exact expression of power density absorbed by nanoparticles in matrix is incorporated to calculate the diameters of chemical reaction region. Calculation results justify experimental ablation criterion, and show that thermal decomposition mechanism predominates the nanosecond pulse-excited process before ablation but it is not suitable for the 100 ps regime which is qualitatively attributed to shock pressure. The effects of pulse duration and nanoparticle size on ablation threshold are examined.
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Willard, Johnson M. "Low-Density Resin-Based Ablative Heat Protection Materials." Science Insights 40, no. 6 (May 30, 2022): 541–44. http://dx.doi.org/10.15354/si.22.re063.

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The severe aerodynamic heating that occurs when a spacecraft reenters the atmosphere takes place. The material used for thermal protection is an essential part of the system used for thermal protection. A number of chemical and physical transformations take place in the ablation heat-resistant material that is based on resin. This material is an organic polymer. We herein briefly review the status quo of low-density resin-based ablative heat protection materials.
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Li Gan, Cheng Mou-Sen, and Li Xiao-Kang. "Thermal-chemical coupling model of laser induced ablation on polyoxymethylene." Acta Physica Sinica 63, no. 10 (2014): 107901. http://dx.doi.org/10.7498/aps.63.107901.

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Dissertations / Theses on the topic "Chemical and thermal ablation"

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Durand, Thibaut. "Stratégies analytiques pour la caractérisation physico-chimique des particules ultrafines métalliques. Application aux aérosols ultrafins générés lors de procédés thermiques (fonderie, projection thermique)." Thesis, Pau, 2014. http://www.theses.fr/2014PAUU3057/document.

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Dans l’industrie, les sources d’expositions aux particules ultrafines (PUF) sont nombreuses et connues depuis longtemps. Ces particules quelles soient manufacturées ou non intentionnelles (générées au cours de procédés industriels) présentent des propriétés singulières qui impliquent des effets sur la santé différents de ceux induits par des particules de plus grande taille (micrométrique). L’étude spécifique des PUF nécessite donc le développement de méthodes de prélèvement et d’analyse adaptées permettant d’obtenir des informations pertinentes complémentaires à la masse totale de poussières prélevées. Cette métrique semblerait insuffisante pour caractériser correctement les effets toxiques des PUF. La thèse a donc été menée dans l’optique de disposer de méthodes dédiées à l’analyse des nanoparticules et en particulier sur la caractérisation chimique des particules en fonction de leur taille (couplage entre dispositifs de prélèvement en fonction de la taille des particules et méthode d’analyse). Les méthodes développées ont ensuite été testées sur des échantillons provenant soit de sites et/ou procédés industriels (fonderie, projection thermique) soit d’essais en laboratoire par prélèvement sur banc de génération de PUF
Expositions to nanoparticles (NPs) are known in industrial hygiene for a long time. Either from primary or secondary sources (industrial processes), these particles have specific properties which imply different toxicities compared to larger particles (micrometric) from the same material. Therefore NPs study requires adapted sampling and analytical technique development and more specifically methods allowing to access relevant information other than total dust mass. The latter seems not be sufficient for toxic effect assessment. Thus, this work has been conducted in order to dispose of analytical methods dedicated to NPs and especially on size-dependent particle chemical analysis. Then, the developed methods have been applied on samples collected either from industrial sites and/or processes (smelter, thermal projection), either from NP generation bench
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Pešina, Zbyněk. "APLIKACE NANOMATERIÁLŮ PRO VÝVOJ PÁJEK BEZ OLOVA." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-234001.

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The present dissertation is motivated by the search for alternatives of lead-free soldering by nanoparticles of metals and their alloys. The research focuses on the possibility of replacing lead-free solders by nanoparticles. This issue is currently being addressed by the use of lead-free solders but their properties are not entirely equivalent to properties of lead-tin based alloys. The theoretical part of the dissertation first summarizes up-to date knowledge on the development of lead-free alloys currently used for soldering in the electronics. The work compares these lead-free solder candidates with previously used Pb-Sn alloys. The second section of the theoretical part is devoted to nanotechnology that offers possible solutions of problems associated with the use of lead-free solders. The text contains a description of the properties of nanocrystalline materials in comparison with those of compact alloys having the same chemical composition. The possibility of preparation of nanoparticles and potential problems associated with small particle sizes are also presented. Introduction of the experimental part focuses on the preparation of nanoparticles of pure metals and alloys by chemical and physical ways as well as on an instrumentation for characterisation and analysis. Attention is focused on the silver in nanoparticle form that exhibits the low temperature sintering effect, which is thermally activated by decomposition of oxide envelope covering the Ag nanoparticles. This factor is critical for low-temperature sintering and thus also for possible future applications. The thermal effects of the low sintering process were studied by methods of thermal analysis. The preparation of the Cu / Ag nano / Cu joints was carried out in-situ in inert atmosphere and under the action of atmospheric oxygen. In both cases varying conditions of thermal treatment were used. The cross sections of the prepared joints were then used for the metallographic analysis of the local mechanical properties of the resulting silver layer, for the chemical composition evaluation of the resulting layers of the joint, and for the microstructure study. Strength characteristics are represented by testing shear strength of individual joints.
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Walter, Aaron Joseph. "Approximate Thermal Modeling of Radiofrequency Cardiac Ablation." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1002.pdf.

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Subramanian, Swetha. "Thermal Ablation Monitoring Using Ultrasound Echo Decorrelation Imaging." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1428068754.

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Andres, Matthias [Verfasser]. "Improving thermal ablation of liver tumors / Matthias Andres." München : Verlag Dr. Hut, 2021. http://d-nb.info/1235279383/34.

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Phipps, Jeffrey Howard. "Radiofrequency induced thermal endometrial ablation : invention and primary assessment." Thesis, University of Leicester, 1991. http://hdl.handle.net/2381/33169.

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The invention and development of Radiofrequency Endometrial Ablation (RaFEA) has been, by turns, exciting, frustrating and anxiety - provoking. Although one of the major motives for developing an alternative means of effective endometrial ablation to the hysteroscopically directed modalities was to improve safety, it seems that in using RaFEA, one set of potential dangers may have been exchanged for another set. Whilst the potentially fatal risks of uterine penetration and fluid toxicity are not encountered with RaFEA, the charging of the patient with an electric field for the duration of therapy brings its own risks, requiring very special precautions of their own (see section 2 - safety). At the time of writing, the future role of the technique is still being decided. It may be that the technique requires such specialist monitoring that it is unsuitable for general use, and may be restricted to one or two specialist centres for the treatment of certain patients who cannot be treated easily any other way. What is certain is that safety is of paramount importance, and the adequate training of those concerned and a basic knowledge of RF physics are both essential to safe practice. Practiced safely, the technique is highly successful, and has proved of considerable benefit to hundreds of patients. However, there have been a number of serious complications in other centres, each of which has been analysed in very great detail. These are considered in section 2 - safety.
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Kolen, Alexander Franciscus. "Elasticity imaging for monitoring thermal ablation therapy in liver." Thesis, Institute of Cancer Research (University Of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404968.

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Breen, Michael Scott. "TISSUE RESPONSE TO INTERVENTIONAL MRI-GUIDED THERMAL ABLATION THERAPY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1080938405.

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TUCCI, Claudio. "Modelling heat transfer in tissues treated with thermal ablation." Doctoral thesis, Università degli studi del Molise, 2021. http://hdl.handle.net/11695/100845.

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Thermal ablation is more and more recognized as an important alternative in cancer treatments, for which the most common procedures followed are surgery, chemotherapy, and radiotherapy. Nevertheless, these common techniques pose critical issues such as: they are too invasive for human body, they can reveal serious side effects and are expensive in terms of financial costs for the national health service. Thermal ablation of tumors, instead, is a minimally invasive treatment option for cancer, with certain advantages such as minor side effects, shorter hospital stays and consequently lower costs. It consists in focusing an energy source (commonly radiofrequency or microwave) in the target zone (the tumoral tissue) by means of a probe, that causes the tumor destruction. Generally, the complete necrosis of tissue happens instantaneously at temperatures over about 60 °C, but lower temperatures with longer exposure times can be achieved. The most common approach is a percutaneous treatment performed with the aid of imaging techniques. On the other hand, the main shortcoming of performing a thermal ablation is to not achieve the complete tissue ablation, so the risk of a tumor recurrence becomes higher. In this context, an in-depth knowledge of thermal therapy physics has a key role in modelling heat transfer in thermal therapies, in order to develop more and more accurate bioheat models for clinical applications, predicting the final necrotic tissue diameters and volumes. Moreover, the lack of experimentation in this field, makes bioheat models even more significant. The first simple bioheat model was developed in 1948 by Harry H. Pennes and it is still widely used, but it has some shortcomings that make the equation not so accurate. For this reason, over the years it has been modified and more complex models have been developed. In this thesis work, a general overview of the different employed techniques in hyperthermia treatments of biological tissues and in particular tumors is first of all introduced, together with techniques used to estimate thermal damage. Next, in the second chapter, a wide state-of-the-art of how the distinct bioheat models have been modified over the years when applied in various hyperthermia treatments of cancer, is described. In chapter three, transient bioheat equations based on different bioheat models, such as Pennes’ model, and three porous media-based model are compared, where the porosity is the volume fraction of blood in the entire tissue domain. The considered porous media-based models are the Local Thermal Non-Equilibrium equations (LTNE), the Local Thermal Equilibrium equation (LTE), and the three-energy equations model. The models are implemented to a biological tissue modelled as a sphere with liver tissue properties. The effects of thermal ablation on the living tissue are included with a spherical energy source at the sphere center. Governing equations with the appropriate boundary conditions are solved with the finite-element software COMSOL Multiphysics®. Results are presented in terms of temperature profiles in the biological tissue, to appreciate differences due to the various bioheat models, concluding that LTNE model is preferable because it is a good compromise between accuracy and complexity. Thus, in the next chapter, the LTNE model is applied to the same spherical biological model with tumoral properties, to investigate the pulsating energy source effects modeled with references to a cosine function with different frequencies, and such different heating protocols are compared at equal delivered energy, namely, different heating times at equal maximum power. The results are shown in terms of tissue temperature and percentage of necrotic tissue obtained. The most powerful result achieved using a pulsating heat source instead of a constant one is the decreasing of maximum temperature in any considered case, even reaching about 30% lower maximum temperatures. Furthermore, the evaluation of tissue damage at the end of treatment shows that pulsating heat allows to necrotize the same tumoral tissue area of the non-pulsating heat source. In addition, a more complex model is developed to study a pulsating protocols application for radiofrequency ablation (RFA) of in vivo liver tissue using a cooled electrode and three different voltage levels. Three distinct heat transfer models coupled to the electrical problem are compared: the simplest but less realistic Pennes’ equation and two porous media-based models, i.e., the LTNE and LTE models, both modified to take into account two-phase water vaporization (tissue and blood). Moreover, different blood volume fractions in liver are considered and the blood velocity is modeled to simulate a vascular network. The results in terms of coagulation transverse diameters and temperature fields at the end of the application show significant differences, especially between Pennes and the modified LTNE and LTE models at high voltage level. The new modified porous media-based models cover the ranges found in the few in vivo experimental studies in the literature and are closer to the published results with similar in vivo protocol. The same model is applied considering tumoral tissue surrounded by healthy tissue and the outcomes show relevant differences when the tumor is included in the model. Thus, the different electrical conductivity and thermal properties between the two types of tissues play a fundamental role in the outcomes. In the final chapter five, the previous LTNE modified model is applied to a spherical tumoral tissue, in order to investigate the effects of different antennas configurations in thermal ablation. Single, double, and triple antennas arrangements are modelled in order to simulate the hepatic cancer treatment, which often requires the destruction of large volume lesions. Furthermore, different blood volume fractions and blood vessels are considered. The results show that using multiple antennas instead of a single antenna offers a potential solution for creating ablation zones with larger dimensions and to allow at the same time to have lower maximum tissue temperatures in all the cases compared to the single antenna configuration.
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Adams, Jacob James. "A coupled electromagnetic-thermal model of heating during radiofrequency ablation." Connect to resource, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1191454972.

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Books on the topic "Chemical and thermal ablation"

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Insight, LLC Medtech. U.S. markets for electrosurgical and thermal ablation products. Newport Beach, CA: Medtech Insight, 2006.

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Grewer, Theodor. Thermal hazards of chemical reactions. Amsterdam: Elsevier, 1994.

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Camberos, Jose A. Analysis of internal ablation for the thermal control of aerospace vehicles. Stanford, CA: Stanford University, Dept. of Aeronautics and Astronautics, 1989.

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Materials thermodynamics: With emphasis on chemical approach. Singapore: World Scientific, 2012.

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A, Rushing R., Thornton C. P, and United States. National Aeronautics and Space Administration., eds. Interim report on chemical and thermal analysis. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Côme, Guy-Marie. Gas-phase thermal reactions: Chemical engineering kinetics. Boston: Kluwer Academic Publishers, 2001.

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A, Rushing R., Thornton C. P, and United States. National Aeronautics and Space Administration., eds. Interim report on chemical and thermal analysis. [Washington, DC: National Aeronautics and Space Administration, 1996.

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Gas-phase thermal reactions: Chemical engineering kinetics. Boston: Kluwer Academic Publishers, 2001.

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Wood modification: Chemical, thermal and other processes. Chichester, England: John Wiley & Sons, 2006.

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V, Bridgwater A., and Boocock D. G. B, eds. Science in thermal and chemical biomass conversion. Speen: CPL Press, 2006.

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Book chapters on the topic "Chemical and thermal ablation"

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Garnon, Julien, Georgia Tsoumakidou, Iulian Enescu, Xavier Buy, and Afshin Gangi. "Overview of Thermal Ablation Devices: HIFU, Laser Interstitial, Chemical Ablation." In Interventional Radiology Techniques in Ablation, 29–41. London: Springer London, 2012. http://dx.doi.org/10.1007/978-0-85729-094-6_5.

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Morrison, Nick, and Neil M. Khilnani. "Elimination of Truncal Vein Reflux: Surgery, Thermal Ablation, and Chemical Ablation for Chronic Venous Disorders." In Practical Approach to the Management and Treatment of Venous Disorders, 45–59. London: Springer London, 2012. http://dx.doi.org/10.1007/978-1-4471-2891-5_7.

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Matin, Surena F., and Kamran Ahrar. "Thermal Ablation." In Renal Cell Carcinoma, 155–66. Totowa, NJ: Humana Press, 2012. http://dx.doi.org/10.1007/978-1-62703-062-5_9.

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Taslakian, Bedros, Nadim Muallem, and William Moore. "Thermal Lung Ablation." In Procedural Dictations in Image-Guided Intervention, 59–64. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40845-3_15.

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Menon, Riju Ramachandran. "Endovenous Thermal Ablation." In Chronic Venous Disorders of the Lower Limbs, 69–80. New Delhi: Springer India, 2014. http://dx.doi.org/10.1007/978-81-322-1991-0_8.

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Isaacs, Mark N. "Endovenous Thermal Ablation." In Phlebology, Vein Surgery and Ultrasonography, 135–46. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-01812-6_10.

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Sadek, Mikel, and Lowell S. Kabnick. "Peripheral Venous Diseases: Endovenous Thermal Ablation Endovenous thermal ablation." In PanVascular Medicine, 4425–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-37078-6_166.

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Zhou, Zhongguo, and Minshan Chen. "Percutaneous Radiofrequency Thermal Ablation." In Radiofrequency Ablation for Small Hepatocellular Carcinoma, 39–46. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-7258-7_5.

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Stewart, Camille L., Barish H. Edil, Robert K. Ryu, and M. Reza Rajebi. "Principles of Thermal Ablation." In Radiation Therapy for Liver Tumors, 77–88. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54531-8_8.

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Stern, John M., and Noriko Salamon. "Stereotactic Thermal Ablation – Heterotopia." In Imaging of Epilepsy, 363–65. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-86672-3_81.

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Conference papers on the topic "Chemical and thermal ablation"

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Barr, B. W., and O. A. Ezekoye. "Analysis of the Equilibrium Approximation in Chemical Ablation of Thermal Protective Systems." In ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ht2012-58462.

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A quasi-steady-state ablation model is used to investigate the behavior of thermochemically ablating systems in equilibrium and nonequilibrium surface thermochemistry regimes. The model is simplified to allow extraction of relevant nondimensional parameters and comparison with existing experimental data on solid carbon combustion. Good agreement is found between model predictions and experimental data, and the data and model are collapsed in terms of the B number and surface Damkohler number. A new formulation for the surface Damkohler number is proposed, and a relationship between the B number and this Damkohler number is derived for the surface equilibrium and nonequilibrium regimes. The Damkohler formulation is applied to the reentry scenario, and the behavior of the B number in this context is explored. Nondimensional parameters governing behavior in the nonequilibrium regime are determined for graphite oxidation, and the results are extrapolated to more complex surface thermochemistry conditions.
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Zhong, Jiaqiang, Takashi Ozawa, and Deborah Levin. "Modeling of Stardust Reentry Reacting Thermal and Chemical Ablation Flow." In 39th AIAA Thermophysics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-4551.

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Zhang, Xing, Bo Mao, Rebecca Histed, and Yiliang Liao. "Modeling for Chemical-Etching Enhanced Pulsed Laser Ablation." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2844.

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Abstract Pulsed laser ablation (PLA) under active liquid confinement, also known as chemical etching enhanced pulsed laser ablation (CE-PLA), has emerged as a novel laser processing methodology, which breaks the current major limitation in underwater PLA caused by the breakdown plasma and effectively improves the efficiencies of underwater PLA-based processes, such as laser-assisted nano-/micro-machining and laser shock processing. Despite of experimental efforts, little attention has been paid on CE-PLA process modeling. In this study, an extended two-temperature model is proposed to predict the temporal/spatial evolution of the electron-lattice temperature and the ablation rate in the CE-PLA process. The model is developed with considerations on the temperature-dependent electronic thermal properties and optical properties of the target material. The ablation rate is formulated by incorporating the mutual promotion between ablation and etching processes. The simulation results are validated by the experimental data of CE-PLA of zinc under the liquid confinement of hydrogen peroxide.
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Ali, Arham, and Murali Sundaram. "Experimental Study of Chemo-Thermal Micromachining of Glass." In ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8772.

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Chemo-thermal micro-machining is a hybrid method of micro fabrication achieved by integrating laser based thermal ablation and chemical etching. Material removal in this process involves focussing laser beam on a glass specimen submerged in aqueous sodium hydroxide (NaOH) solution that causes chemical degradation of glass along with thermal ablation at the laser target point. Though laser by itself is capable of machining numerous materials, it often causes micro fractures radially along the machined surface, especially when used on glass. In the proposed process, continuous waves of carbon dioxide laser (10.6 μm wavelength) with varying power are irradiated on the surface of borosilicate glass slide immersed in 1M NaOH solution for varying duration of exposure. This resulted in smaller hole diameter and better surface finish in the micro machining of glass, as compared to machining by laser beam alone.
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MUNGIGUERRA, STEFANO, ANSELMO CECERE, and RAFFAELE SAVINO. "AERO-THERMO-DYNAMIC STUDY OF ULTRA-HIGH- TEMPERATURE CERAMIC COMPOSITES FOR THERMAL PROTECTION SYSTEMS AND ROCKET NOZZLES." In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35774.

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The most extreme aero-thermo-dynamic conditions encountered in aerospace applications include those of atmospheric re-entry, characterized by hypersonic Mach numbers, high temperatures and a chemically reacting environment, and of rocket propulsion, in which a combusting, high-pressure, supersonic flow can severely attack the surfaces of the motor internal components (particularly nozzle throats), leading to thermo-chemical erosion and consequent thrust decrease. For these applications, Ultra-High-Temperature Ceramics (UHTC), namely transition metal borides and carbides, are regarded as promising candidates, due to their excellent high-temperature properties, including oxidation and ablation resistance, which are boosted by the introduction of secondary phases, such as silicon carbide and carbon fibers reinforcement (in the so-called Ultra-High- Temperature Ceramic Matrix Composites, UHTCMC). The recent European H2020 C3HARME research project was devoted to development and characterization of new-class UHTCMCs for near-zero ablation thermal protection systems for re-entry vehicles and near-zero erosion rocket nozzles. Within the frame of the project and in collaboration with several research institutions and private companies, research activities at the University of Naples “Federico II” (UNINA) focused on requirements definition, prototypes design and test conditions identification, with the aim to increase the Technology Readiness Level (TRL) of UHTCMC up to 6. Experimental tests were performed with two facilities: an arc-jet plasma wind tunnel, where small specimens were characterized in a relevant atmospheric re-entry environment (Fig.1a), and a lab-scale hybrid rocket engine, where material testing was performed with different setups, up to complete nozzle tests, in conditions representative of real propulsive applications (Fig.1b). The characterization of the aero-thermo-chemical response and ablation resistance of different UHTCMC formulations was supported by numerical computations of fluiddynamic flowfields and materials thermal behavior. The UNINA activities provided a large database supporting the achievement of the project objectives, with development and testing of full-scale TPS assemblies and a large-size solid rocket nozzle.
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Havstad, Mark, and Preston Carter. "Thermo-chemical ablation during reentrant and high altitude skipping flight." In 39th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2001. http://dx.doi.org/10.2514/6.2001-979.

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Jiang, Chunlan, Zhenpeng Qin, Gary Long, and John C. Bischof. "An In Vitro Study on Adjuvant Enhanced Irreversible Electroporation." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80528.

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Recently, irreversible electroporation (IRE) has emerged as a promising tumor ablation technique. IRE induces cell death by irreversibly compromising membrane integrity with a series of short, high voltage electrical pulses [1]. IRE offers many advantages over surgery and thermal ablations including that it 1) is fast and minimally invasive, 2) destroys the tumor while preserving adjacent connective tissues [2], and 3) can be delivered with negligible thermal injury [3]. Here we hypothesize that the thresholds necessary to successfully electroporate cancer cell membranes, and therefore more effectively destroy an entire tumor, can be dramatically improved by careful choice of 1) electroporation parameter, and 2) chemical adjuvants that specifically impact the cell membrane.
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Young, Christopher N., Clive R. Clayton, Jon P. Longtin, and Richard D. Granata. "Depth Profiling of Polymer Composites by Ultrafast Laser Ablation." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11790.

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Past work has shown femtosecond laser ablation to be a non-thermal process at low fluences in polymer systems. The ablation rate in this low fluence regime is very low, allowing for micro-scale removal of material. We have taken advantage of this fact to perform shallow depth profiling ablation on carbon fiber reinforced polymer (CFRP) composites. Neat resin and composite samples were studied to establish reference ablation profiles. These profiles and the effects of the heterogeneous distribution of carbon fibers were observed through optical and scanning electron microscopy. Weathered materials that have been subjected to accelerated tests in artificial sunlight or high temperature conditions were ablated to evaluate any correlation between exposure and change in ablation characteristics. Preliminary Raman and micro-ATR analysis performed before and after ablation shows no chemical changes indicative of thermal effects. The low-volume-ablation property was utilized in an attempt to expose the sizing-matrix interphase for analysis.
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Mori, Shoji, Rajagopal Aravalli, Jeunghwan Choi, Erik Cressman, and John Bischof. "Importance of Protein Denaturation to Thermochemical Ablation of Liver Tumors." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53950.

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Solid tumors in the liver such as hepatocellular carcinoma, often are not amenable to chemotherapy or surgical therapies. Local “ablation” methods including thermal and chemical ablation are therefore options for treatment. Hyperthermic ablation methods (RF, microwave, HIFU and laser) can potentially accomplish treatment in a single session but are considerably more costly than chemicals. It was therefore of interest to investigate if a known protein denaturant such as urea would destroy liver tumors. Further, we wished to assess whether this destruction occurs by protein denaturation mechanisms similar to hyperthermic destruction. Specifically, Lepock showed that hyperthermic cell destruction occurs for many cells when overall protein denaturation is greater than 5% (i.e. survival drops from 95% to 5% beyond this range). In this study we report on the cytotoxicity of urea on human hepatoma HuH-7. We then quantify the amount of cellular protein denaturation associated with cytotoxicity and show that protein denaturation in excess of 5% of total protein must occur in order for significant cell killing.
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Küper, S., and M. Stuke. "Ablation with Ultrashort UV - Excimer Laser Pulses." In Microphysics of Surfaces, Beams, and Adsorbates. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/msba.1989.mb1.

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Surfaces can be structured by exposure to intense uv laser light1. A wide variety of materials with different penetration depths for uv laser light and different chemical constitution show for certain fluence ranges high removal rates on the order of micrometers per pulse, along with little or no thermal damage to the edges. Thus the surfaces of many solids have been patterned with a resolution down to less than one micrometer2.
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Reports on the topic "Chemical and thermal ablation"

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Shang, Joseph J. Thermo-Chemical Phenomena Simulation for Ablation. Fort Belvoir, VA: Defense Technical Information Center, February 2011. http://dx.doi.org/10.21236/ada563778.

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Cadeddu, Jeffrey, and Igor Sorokin. Management of small renal masses with thermal ablation. BJUI Knowledge, October 2019. http://dx.doi.org/10.18591/bjuik.0116.v2.

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Nelson, Daniel. Noninvasive Thermal Ablation of Osteomyelitis-Causing Bacteria using Functionalized Nanoparticles. Fort Belvoir, VA: Defense Technical Information Center, March 2012. http://dx.doi.org/10.21236/ada562458.

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Nelson, Daniel C. Noninvasive Thermal Ablation of Osteomyelitis-Causing Bacteria Using Functionalized Nanoparticles. Fort Belvoir, VA: Defense Technical Information Center, September 2011. http://dx.doi.org/10.21236/ada554636.

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Ehst, D. A., and A. Hassanein. Thermal ablation of plasma-facing surfaces in tokamak disruptions: Sensitivity to particle kinetic energy. Office of Scientific and Technical Information (OSTI), February 1996. http://dx.doi.org/10.2172/219429.

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P. F. Dobson, T. J. Kneafsey, E. L. Sonnenthal, and Nicolas Spycher. Modeling of Thermal-Hydrological-Chemical Laboratory Experiments. Office of Scientific and Technical Information (OSTI), May 2001. http://dx.doi.org/10.2172/786557.

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Gray, William J., and Evan Scannapieco. Thermal and Chemical Evolution of Collapsing Filaments. Office of Scientific and Technical Information (OSTI), January 2013. http://dx.doi.org/10.2172/1305817.

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Krishnan, G. N., A. Sanjurjo, A. S. Damle, B. J. Wood, and K. H. Lau. Thermal/chemical degradation of inorganic membrane materials. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/10185708.

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Yuan, Fang. A Novel Combination of Thermal Ablation and Heat-Inducible Gene therapy for Breast Cancer Treatment. Fort Belvoir, VA: Defense Technical Information Center, April 2009. http://dx.doi.org/10.21236/ada540198.

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Taylor, P. A. Thermal and Chemical Stability of Crystalline Silicotitanate Sorbent. Office of Scientific and Technical Information (OSTI), October 2000. http://dx.doi.org/10.2172/814206.

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