152 results on '"Sauder C"'
Search Results
2. Experimental characterisation of damage in SiC/SiC minicomposites
- Author
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Sauder C., Boller E., Caldemaison D., Crepin J., Bornert M., Chateau C., Gélébart L., Langer M., and Ludwig W.
- Subjects
Physics ,QC1-999 - Abstract
SiC/SiC composites are studied for their potential use in the next generation of nuclear reactors. A multiscale approach is under development to construct a predictive modelling of their complex damageable mechanical behaviour due to their heterogeneous microstructure. This paper focuses on the damage characterisation of the composite at the scale of the tow at room temperature, both in terms of its spatial distribution and its chronology. Such observations are necessary to validate a multiscale damage modelling at the microscopic scale. The nonlinear behaviour is related to the accumulation of damages such as matrix cracking, fibre/matrix debonding and finally fibre breaking. Therefore, in-situ tensile tests were carried out on SiC/SiC minicomposites using scanning electron microscopy. Specific procedures could be used to get statistical data on the crack evolution. The first results especially show that the growth of the crack openings over the global strain is related to inter-crack distance. This test was complemented by a microtomographic investigation, conducted at the ESRF, performed on a minicomposite submitted to a tensile load. An analysis conducted on the 3D image of a crack shows a slow propagation of the matrix cracking through the minicomposite section.
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- 2010
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3. Impact of ex-PAN carbon fibers thermal treatment on the mechanical behavior of C/SiC composites and on the fiber/matrix coupling
- Author
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Fellah, C., Braun, J., Sauder, C., Sirotti, F., and Berger, M.H.
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- 2021
- Full Text
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4. Mechanical behavior of SiC/SiC composites after exposure in high temperature liquid sodium for Sodium Fast Reactors applications
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Braun, J., Sauder, C., Rouillard, F., and Balbaud-Célérier, F.
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- 2021
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5. Influence of the carbon interface on the mechanical behavior of SiC/SiC composites
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Fellah, C., Braun, J., Sauder, C., Sirotti, F., and Berger, M.-H.
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- 2020
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6. 3D Detection and Quantitative Characterization of Cracks in a Ceramic Matrix Composite Tube Using X-Ray Computed Tomography
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Chen, Y., Gélébart, L., Chateau, C., Bornert, M., King, A., Aimedieu, P., and Sauder, C.
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- 2020
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7. The potential impact of the M1/M4 muscarinic receptor agonist karXT on cognitive impairment in schizophrenia
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Horan, W., Harvey, P.D., Sauder, C., Ramsay, I., Miller, A.C., Paul, S.M., and Brannan, S.K.
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- 2023
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8. Influence of surface fibre properties and textural organization of a pyrocarbon interphase on the interfacial shear stress of SiC/SiC minicomposites reinforced with Hi-Nicalon S and Tyranno SA3 fibres
- Author
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Buet, E., Sauder, C., Sornin, D., Poissonnet, S., Rouzaud, J.-N., and Vix-Guterl, C.
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- 2014
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9. Modeling of damage in unidirectional ceramic matrix composites and multi-scale experimental validation on third generation SiC/SiC minicomposites
- Author
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Chateau, C., Gélébart, L., Bornert, M., Crépin, J., Caldemaison, D., and Sauder, C.
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- 2014
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10. Influence of chemical and physical properties of the last generation of silicon carbide fibres on the mechanical behaviour of SiC/SiC composite
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Buet, E., Sauder, C., Poissonnet, S., Brender, P., Gadiou, R., and Vix-Guterl, C.
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- 2012
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11. In situ X-ray microtomography characterization of damage in SiC f/SiC minicomposites
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Chateau, C., Gélébart, L., Bornert, M., Crépin, J., Boller, E., Sauder, C., and Ludwig, W.
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- 2011
- Full Text
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12. Transverse and longitudinal coefficient of thermal expansion of carbon fibers at high temperatures (300–2500 K)
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Pradere, C. and Sauder, C.
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- 2008
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13. Young's modulus, thermal expansion coefficient and fracture behavior of selected Si–B–C based carbides in the 20–1200 °C temperature range as derived from the behavior of carbon fiber reinforced microcomposites
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Michaux, A., Sauder, C., Camus, G., and Pailler, R.
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- 2007
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14. Susceptibility of Borna disease virus to the antiviral action of gamma-interferon: Evidence for species-specific differences
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Sauder, C., Herpfer, I., Hässler, C., and Staeheli, P.
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- 2004
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15. Identification of differentially expressed genes in brains of newborn Borna disease virus-infected rats in the absence of inflammation
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Jehle, C., Herpfer, I., Rauer, M., Schwemmle, M., and Sauder, C.
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- 2003
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16. The tensile properties of carbon matrices at temperatures up to 2200 °C
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Sauder, C., Lamon, J., and Pailler, R.
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- 2005
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17. Prediction of elastic properties of carbon fibers and CVI matrices
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Sauder, C. and Lamon, J.
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- 2005
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18. OPTIMIZATION OF THE SIC/SIC COMPOSITES FIBER/MATRIX INTERFACES FOR NUCLEAR APPLICATIONS
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Braun, J., Fellah, C., Buet, E., Sauder, C., Lorrette, C., Berger, M-H., CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon] (LGL-TPE), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon), Centre des Matériaux (MAT), MINES ParisTech - École nationale supérieure des mines de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Centre des Matériaux (CDM), and Mines Paris - PSL (École nationale supérieure des mines de Paris)
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[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,COMPOSITES ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,OPTIMIZATION ,SIC/SIC ,FIBER/MATRIX - Abstract
International audience; SiC/SiC composites have aroused interest for nuclear applications thanks to their high decomposition temperature, strong thermomechanical properties, neutron transparency and low swelling under irradiation. Given these properties, SiC/SiC composites are mainly considered as cladding material either for generation IV systems (such as Gas-cooled Fast Reactors) or current nuclear power plant (Light Water Reactors). Two types of fibers are currently available to manufacture nuclear grade composites Hi-Nicalon S (HNS) and Tyranno SA3 (TSA3). Unfortunately, CVI matrix composites made of each fiber do not exhibit similar mechanical behavior. The HNS-based highlight higher ultimate tensile strains and stresses than the TSA3-based ones. Thus, both fibers have similar properties and identical interphase and matrix, which should have lead to similar behavior. The fiber/matrix coupling must have a strong influence on the final mechanical behavior. Hypotheses were made that those differences came from discrepancies in the fibers surface roughness but its decrease is not the only factor at stake. The understanding of the mechanisms controlling the fiber/matrix were then conducted in order to improve the mechanical properties of SiC/SiC composites made of TSA3 fibers. The fiber/matrix interface was characterized by a combination of mechanical testing and TEM investigations. The differences in the composition of the fiber surface were quantified by XPS and IGC. Results have pointed out that the carbonaceous structure of the fiber extreme surface has to be responsible of those mechanical behaviors.
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- 2019
19. Macroscopic Fibers and Ribbons of Oriented Carbon Nanotubes
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Vigolo, Brigitte, P[eacute]nicaud, Alain, Coulon, Claude, Sauder, C[eacute]dric, Pailler, Ren[eacute], Journet, Catherine, Bernier, Patrick, and Poulin, Philippe
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- 2000
20. P.0794 KarXT treatment improves cognitive performance in cognitively impaired patients with schizophrenia: a post-hoc analysis of the phase 2 EMERGENT-1 study
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Sauder, C., Allen, L., Baker, E., Granger, K., Brier, A., Kavanagh, S., Marcus, R., Paul, S., Miller, A., and Brannan, S.
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- 2021
- Full Text
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21. Thermomechanical(physical) performances of SiC/SiC composites for nuclear applications
- Author
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Bourlet, F., Lorrette, C., Guilbert, T., Sauder, C., Vignoles, G., CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire des Composites Thermostructuraux (LCTS), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Snecma-SAFRAN group-Centre National de la Recherche Scientifique (CNRS), amplexor, amplexor, CEA-Direction de l'Energie Nucléaire (CEA-DEN), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Sciences et Technologies - Bordeaux 1-Snecma-SAFRAN group
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[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,composites nuclear applications ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,oxidation ,SiC/SiC ,Thermomechanical (physical) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,ATF ,quench ,performances SiC/SiC ,performances ,ComputingMilieux_MISCELLANEOUS ,Thermomechanical(physical) - Abstract
International audience; The interest of SiC/SiC composites as structural materials for nuclear applications has grown over the past decade. Due to their high thermomechanical properties over a wide range of temperature as well as their stability under neutron irradiation, SiC/SiC were initially considered for both the fuel cladding element and the hexagonal sub-assembly body for the fast fission neutron reactors. In 2011, the major accident at Fukushima Daiichi highlighted the need to improve the safety of current facilities and future planned designs of light water reactors (LWRs). The use of a refractory and less reactive material under oxidizing conditions such as a SiC-based fuel cladding could be an alternative solution to the conventional zirconium alloys to improve the accident tolerance.The present work primarily focuses on the thermomechanical performances of SiC/SiC composites under severe environments including high temperature (> 1000DC) in neutral then steam atmospheres. A first objective is to specify the relevant and suitable working range for using the composites under normal operating conditions. The determination of temperature limits before occurring significant degradation, as well as the underlying causes of such a decrease were investigated on representative composite structures. A second objective addresses the thermal shock tolerance of SiC/SiC composites to demonstrate their ability to remain structurally sound after water quenching during the re-flooding phase in situation of accidents for LWRs. Preservation of the geometry which maintain core coolability up to very high temperature are very positive results. Close examinations of the oxidized surfaces evidence the efficiency of the passivation layer in protecting substrate. Finally, a correlation between the observations and the residual mechanical properties was developed to propose a mechanism.
- Published
- 2017
22. quench behavior of sic/sic cladding after a high temperature ramp under steam conditions
- Author
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Lorrette, C., Guilbert, T., Bourlet, F., Sauder, C., Briottet, L., Palancher, H., Bischoff, J., Pouillier, E., CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), AREVA, Groupe AREVA, EDF R&D (EDF R&D), EDF (EDF), and amplexor, amplexor
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[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,quench ,stomatognathic system ,Accident Tolerant Fuel ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,SiC/SiC composite ,oxidation ,Silicon carbide ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
International audience; The present work reports the results from experiments on SiC/SiC clad segments demonstrating their outstanding ability to preserve a coolable geometry during the reflood phase of a postulated design basis Loss Of Coolant Accident (LOCA) and beyond. Experimental assessments of thermal shock performance were investigated for this purpose by quenching specimens from 1400DC and 1500DC under steam environment into room temperature water. SiC/SiC composites remain structurally sound and retain their mechanical properties. Post-quenched SiC/SiC tubes were subjected to internal helium gas pressure to test the permeation of the structures. These tests established the link between the leak-tightness measurements and damages in the microstructure through micro crack initiation. Close examinations of the oxidized surfaces evidence the efficiency of the passivation layer in protecting substrates. Finally, a correlation of the observations with the oxide growth rate is developed to support a better understanding of the mechanisms as well as the prediction of the acceptable limits of application. These positive results reinforce the interest of a SiC-based fuel cladding concept to enhance the accident tolerance of fuel for future reactors.
- Published
- 2017
23. Quench Behavior Of Sic/Sic Cladding After High Temperature Ramp Under Steam Conditions
- Author
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Lorrette, C., Guilbert, T., Bourlet, F., Sauder, C., Briottet, L., Bischoff, J., Pouillier, E., CEA-Direction de l'Energie Nucléaire (CEA-DEN), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), CEA Tech en régions (CEA-TECH-Reg), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), AREVA, Groupe AREVA, EDF R&D (EDF R&D), EDF (EDF), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), This work was supported by the French Nuclear Joint Program (I3P), and amplexor, amplexor
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[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,Accident Tolerant Fuel ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,SiC/SiC composite ,silicon carbide ,Oxidation ,SiCf/SiC composites ,Quench ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
International audience; Silicon carbide based continuous fiber ceramic matrix composite materials (SiCf/SiC) are considered by the French Nuclear Institute as a long-term option for Gen III/III+ light water reactor cladding to improve the accident tolerance of the fuel (ATF). Consistent with this ambition, the extensive RetD activities over the post-Fukushima period has resulted in significant progress in the fabrication of representative and functional specimen, removing some of technological barriers that prevent such advanced ceramics materials from using in a nuclear environment. In addition to on-going basic research, a collaborative program was launched to assess the thermo-mechanical performances of SiC/SiC composites produced at CEA and to collect the required data for a preliminary conceptual design.The present work reports the results from experiments on SiC/SiC clad segments demonstrating their outstanding ability to preserve a coolable geometry during the reflood phase of a postulated design basis Loss of Coolant Accident (LOCA) and beyond. Experimental assessments of thermal shock performance were investigated for this purpose by quenching specimens from 1200DC to 1500DC under steam environment into room temperature water. SiC/SiC composites remain structurally sound and exhibit a slightly affected residual mechanical behavior depending on the oxidation time and the quenching temperature. Post-quenched SiC/SiC tubes were subjected to internal helium gas pressure to test the permeation of the structures. These tests clearly established the link between the leak-tightness retention and damages in the microstructure through micro crack initiation. Close examinations of the oxidized surfaces evidence the efficiency of the passivation layer in protecting substrates. Finally, a correlation of the observations with the oxide growth rate is developed to support a better understanding of the mechanisms as well as the prediction of the acceptable limits of application. These positive results reinforce the interest of a SiC-based fuel cladding concept to enhance the accident tolerance of fuel for future reactors.
- Published
- 2017
24. Effects of braiding angle on damage mechanisms in SiC/SiC composite tubes characterized by X-ray computed tomography
- Author
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chen, yang, Gélébart, L., Bornert, Michel, Chateau, Camille, Sauder, C., King, A, chen, yang, Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Navier (navier umr 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), and Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[SPI.MECA.MEMA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] ,[SPI.MAT] Engineering Sciences [physics]/Materials ,[SPI.MECA.MEMA] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanics of materials [physics.class-ph] ,[SPI.MAT]Engineering Sciences [physics]/Materials - Abstract
International audience; The mechanical behavior of 2D-braided SiC/SiC composite tubes depends strongly on the braiding angle. Tubes of three different braiding angles (30°, 45°, 60°) have been observed during in situ tensile tests using synchrotron X-ray tomography. In order to detect the slightly open cracks from heterogeneous microstructures, various image processing techniques have been used and developed. Digital Volume Correlation (DVC) allows the 3D displacement field within the material under loading to be estimated. The crack networks are extracted by a DVC-based image subtraction. The detected cracks are first classified into two groups according to their orientations, and then are characterized in qualitative and quantitative ways. The crack analyses on the three different tubes provide not only a study on the braiding angle effects but also a better understanding on the damage mechanisms of the composite.
- Published
- 2017
25. HRTEM investigation of local damage mechanisms at fiber/matrix interface of SiC/SiC composites
- Author
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Fellah, C., Berger, Marie-Hélène, Braun, J., Sauder, C., Poissonnet, S., CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre des Matériaux (CDM), Mines Paris - PSL (École nationale supérieure des mines de Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Centre des Matériaux (MAT), and MINES ParisTech - École nationale supérieure des mines de Paris
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SiC ,matrix interface ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,pyrocarbon local damage mechanisms ,SiC composite ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,fiber - Abstract
International audience; The behavior of fiber/matrix bonding leading to poor/fair damage tolerance of SiC/SiC composites was investigated through the observation of the local damage mechanisms in this interface region.SiCf/SiCm composites reinforced with last generation small diameter SiC fibers are promising candidates for thermomechanical applications in nuclear environments. The ability of these SiCf/SiCm composites to sustain damage is dictated by the fiber/matrix coupling mode, achieved through a pyrolytic carbon (PyC) interphase. In this study, opposite coupling behaviors were compared. Push-out tests were conducted on SiC/SiC composites. Indented fibers were extracted by FIB (Focused Ion Beam) and the microstructural organization of the carbon interface around a dislodge fiber were analyzed by HRTEM (High Resolution Transmission Electronic Microscopy).The experimental results have demonstrated the key role of the characteristics of SiC fibers surface and of its structure of carbon rich multi-layers on the macroscopic mechanical behavior of the SiC/SiC composite. It has also been proved that crack deflection occurred near the fiber/PyC region rather than near the matrix/PyC one. This technique is promising for the understanding and the improvement of the interfacial properties of the ceramic composite materials.
- Published
- 2016
26. Investigation of tailored SiC/SiC composites for Sodium-cooled Fast Reactors
- Author
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Braun, J., Sauder, C., Balbaud-Celerier, F., Rouillard, F., Guéneau, C., Lamon, J., CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Mécanique et Technologie (LMT), and École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
International audience; Increasing the sustainability and the safety ofnuclear reactors require the development of new types ofreactors (GEN-IV systems) which can work as breeder(producing more fuel that it consumes) and can offer thepossibility of burning minor actinides to reduce the waste,such as the Sodium- (SFR) or the Gas-cooled (GFR) FastReactors. Therefore, there is a need to assess materialswhich can withstand these very harsh core conditions. Inthis aim, SiC/SiC composites are promising candidatesthanks to their high decomposition temperature(> 2000°C), low swelling and creep under irradiation andgood neutron transparency. A recent CEA patent hashighlighted that SiC/SiC-based hexagonal tubes wouldincrease the resistance to melting and, as a consequence,the safety of the SFR core. In this way, techniques havebeen developed to manufacture a SiC/SiC hexagonal tubewith given dimensions, which has a relatively low level ofporosities and a pseudo-ductile mechanical behavior(tolerance to deformation). Besides, the chemicalcompatibility between SiC and SiC/SiC compositestowards liquid sodium and its impurities (in particularoxygen) was investigated. For this purpose, two sets ofexperiments were conducted in the CORRON$^2$facility(CEA). On the one hand, immersions up to 2000h in anoxygen-purified ([O]
- Published
- 2016
27. SiC/SiC composite behavior in LWR conditions and under high temperature steam environment
- Author
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Lorrette, C., Sauder, C., Billaud, P., Hossepied, C., Loupias, G., Braun, J., Michaux, A., Torres, E., Rebillat, F., Bischoff, J., Ambard, A., CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire des Composites Thermostructuraux (LCTS), Université de Bordeaux (UB)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Snecma-SAFRAN group-Centre National de la Recherche Scientifique (CNRS), AREVA NP Lyon, EDF R&D (EDF R&D), EDF (EDF), AREVA NP - Centre Technique (FRANCE), amplexor, amplexor, CEA-Direction de l'Energie Nucléaire (CEA-DEN), and Université Sciences et Technologies - Bordeaux 1-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Snecma-SAFRAN group-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,SiC ,corrosion ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,composite ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,ComputingMilieux_MISCELLANEOUS ,ATF - Abstract
International audience; Tubular nuclear-grade SiC/SiC composites produced by CEA were investigatedin the present work as cladding material to enhance the accident tolerance ofLight Water Reactors (LWRs). A first part reports a preliminary assessment of thebehavior of SiC/SiC composite tubes in simulated relevant LWR conditionsrelated with the manufacturing parameters. The dependence of the corrosion rateon the chemical composition of water is also investigated for a betterunderstanding of the hydrothermal SiC corrosion mechanisms. Additionally, theability of SiC/SiC composite tubes to preserve their geometry and maintaincoolability under high temperature steam environment is examined. Oxidationtests are performed to confirm the favorable behavior and to evaluate theoxidation kinetics of the composite exposed to high-temperature steam (up to1400°C) under pressure and under dynamic gas flow conditions.
- Published
- 2015
28. On the role of in-plane damage mechanisms on the macroscopic behavior of SiC/SiC composites from complementary 2D and 3D in-situ investigations
- Author
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chen, yang, Bernachy-Barbe, F, Gélébart, L, Bornert, Michel, Chateau, Camille, Sauder, C, Service des Recherches Métallurgiques Appliquées (SRMA), Département des Matériaux pour le Nucléaire (DMN), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Navier (navier umr 8205), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS), UTT France, and Chen, Yang
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[SPI.GCIV.MAT]Engineering Sciences [physics]/Civil Engineering/Matériaux composites et construction ,[SPI.GCIV.MAT] Engineering Sciences [physics]/Civil Engineering/Matériaux composites et construction ,[SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing ,[SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing - Abstract
International audience; The mechanical behavior of architectured SiC/SiC composites is driven by different damage mechanisms whose understanding is required for building micromechanics-based models able to reproduce and predict its complexity. The kinematics of the surface, precisely analyzed using DIC at the textile pattern scale, exhibit a fiber realignment unexplained by the cracks observed at the surface. The missing mechanism, tracked by tomography in-situ testing (SOLEIL synchrotron), appears to be in-plane microcracking which does not emerge at the free surface of the composite.
- Published
- 2015
29. Evaluation of the chemical compatibility of SiC/SiC composite materials in nuclear environments
- Author
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Sauder, C., Guéneau, C., Balbaud-Celerier, F., Braun, J., CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), and amplexor, amplexor
- Subjects
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th] ,SiC ,tantale ,[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] ,[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] ,diffusion ,cinetique ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,niobium ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2015
30. Non-parametric approaches to the impact of Holstein heifer growth from birth to insemination on their dairy performance at lactation one.
- Author
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SAUDER, C., CARDOT, H., DISENHAUS, C., and LE COZLER, Y.
- Abstract
Parametric approaches have been used widely to model animal growth and study the impact of growth profile on performance. Individual variation is often not considered in such approaches. However, non-parametric modelling allows this. Such an approach, based on spline functions, was used to study the importance of growth profiles from age 0 to 15 months (i.e. insemination) on milk yield and composition in primiparous cows. A dataset of 447 heifers was used for analysis of growth performance; 296 of them were also used to study impact on lactation. All of them originated from a French experimental herd and were born between 1986 and 2006. Clustering methods were also tested. Comparison of spline methods showed that a cubic spline interpolation method, with no smoothing parameter, was best suited to studying heifer growth. Similarly, partitioning around medoids proved the most accurate clustering method for classifying heifer growth into groups. The results of these analyses agreed with those previously published, supporting the utility of these methods. A final study on the impact of breakdowns in the growth curves was performed. A breakdown was considered only when the derivative of the interpolation function was negative or zero. Of the 447 heifers initially used, 125 (Gr0), 175 (Gr1) and 147 (Gr2) had no, one, or two or more breakpoints during the 0–15 months of age period. Milk yield on a 305 d basis was significantly reduced with an increased number of breakpoints (6548 v. 6828 and 6905 kg for Gr2, Gr1 and Gr0 animals, respectively). Fat content was also higher in Gr2 than in Gr0 groups, but overall, no difference in total fat or protein-corrected milk production was noted. The intersection between groups for growth and groups for breakdowns confirmed that animals with two or more breakdowns belonged more frequently to the group with the lowest growth performance. These results offer the possibility of analysing large databases, originating from an automatic collecting system (e.g. milking robots) or from different herds, breeds, genetics, etc. These approaches could also be used for studies on body score index, girth development, lactation profiles, etc. and in other species, such as dairy goats or beef cattle. They could find use in the development of new models of prediction, e.g. the probability of heat appearance on an animal basis, which could be included among useful management tools. [ABSTRACT FROM PUBLISHER]
- Published
- 2013
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31. Influence of Interface Characteristics on the Mechanical Properties of Hi-Nicalon type-S or Tyranno-SA3 Fiber-Reinforced SiC/SiC Minicomposites.
- Author
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Sauder, C., Brusson, A., and Lamon, J.
- Subjects
- *
MECHANICAL behavior of materials , *COMPOSITE materials , *MICROSTRUCTURE , *SHEAR (Mechanics) , *STRAINS & stresses (Mechanics) , *SURFACE roughness - Abstract
The tensile behavior of CVI SiC/SiC composites with Hi-Nicalon type-S (Hi-NicalonS) or Tyranno-SA3 (SA3) fibers was investigated using minicomposite test specimens. Minicomposites contain a single tow. The mechanical behavior was correlated with microstructural features including tow failure strength and interface characteristics. The Hi-NicalonS fiber-reinforced minicomposites exhibited a conventional damage-tolerant response, comparable to that observed on composites reinforced by untreated Nicalon or Hi-Nicalon fibers and possessing weak fiber/matrix interfaces. The SA3 fiber-reinforced minicomposites exhibited larger interfacial shear stresses and erratic behavior depending on the fiber PyC coating thickness. Differences in the mechanical behavior were related to differences in the fiber surface roughness. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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32. An in vivo model of external superior laryngeal nerve paralysis: laryngoscopic findings.
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Roy N, Barton ME, Smith ME, Dromey C, Merrill RM, and Sauder C
- Published
- 2009
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33. Effects of posture on shear rates in human brachial and superficial femoral arteries.
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Newcomer, S. C., Sauder, C. L., Kuipers, N. T., Laughlin, M. H., and Ray, C. A.
- Subjects
- *
POSTURE , *BRACHIAL artery , *FEMORAL artery , *HUMAN body , *ARTERIES - Abstract
Shear rate is significantly lower in the superficial femoral compared with the brachial artery in the supine posture. The relative shear rates in these arteries of subjects in the upright posture (seated and/or standing) are unknown. The purpose of this investigation was to test the hypothesis that upright posture (seated and/or standing) would produce greater shear rates in the superficial femoral compared with the brachial artery. To test this hypothesis, Doppler ultrasound was used to measure mean blood velocity (MBV) and diameter in the brachial and superficial femoral arteries of 21 healthy subjects after being in the supine, seated, and standing postures for 10 mm. MBV was signifi- cantly higher in the brachial compared with the superficial femoral artery during upright postures. Superficial femoral artery diameter was significantly larger than brachial artery diameter. However, posture had no significant effect on either brachial or superficial femoral artery diameter. The calculated shear rate was significantly greater in the brachial (73 ± 5, 91 ± 11, and 97 ± 13 s') compared with the superficial femoral (53 ± 4, 39 ± 77, and 44 ± 5 s~) artery in the supine, seated, and standing postures, respectively. Contrary to our hypothesis, our current findings indicate that mean shear rate is lower in the superficial femoral compared with the brachial artery in the supine, seated, and standing postures. These findings of lower shear rates in the superficial femoral artery may be one mechanism for the higher propensity for atherosclerosis in the arteries of the leg than of the arm. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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34. MECHANICAL PROPERTIES OF Hi-NICALON S AND SA3 FIBER REINFORCED SiC/SiC MINICOMPOSITES.
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Sauder, C., Brusson, A., and Lamon, J.
- Subjects
STRENGTH of materials ,SILICON carbide ,FIBERS ,COMPOSITE materials ,SILICON - Abstract
The article focuses on a study that examined the tensile behavior of Chemical Vapor Infiltration (CVI) silicon carbide/silicon carbide (SiC/SiC) reinforced with Hi-Nicalon S or SA3 fibers. The results indicate that the Hi-Nicalon S fiber reinforced minicomposites exhibited a conventional response, comparable to that one observed on composites reinforced with as-received Nicalon or Hi-Nicalon S fibers and possessing weak fiber and matrix interfaces.
- Published
- 2008
35. Food cravings, depression, and premenstrual problems.
- Author
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Smith, Stuart L., Sauder, Cynthia, Smith, S L, and Sauder, C
- Published
- 1969
36. Innovative SiC/SiC Composite for Nuclear Applications
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Le Flem Marion, Zabiego Maxime, Coupé Aurélie, Gélébart Lionel, Michaux Aurore, Briottet Laurent, Lorrette Christophe, Sauder Cédric, Chaffron Laurent, and Séran Jean-Louis
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Physics ,QC1-999 - Published
- 2013
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37. Stimulation of the otolith organs by ultrasonic bone stimulation of the mastoid increases muscle sympathetic nerve activity in humans.
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Ray, C. A. and Sauder, C. L.
- Subjects
- *
SYMPATHETIC nervous system , *OTOLITH organs , *VESTIBULAR apparatus - Abstract
Muscle sympathetic nerve activity (MSNA) is altered by stimulation of the vestibular system. Studies indicate that the otolith organs mediate increases in MSNA when engaged by head-down rotation (HDR). These findings are important with regards to postural blood pressure regulation on earth and post-spaceflight orthostatic intolerance. It is currently unknown if nongravitational activation of the otolith organs can mediate increases in MSNA. One method believed to stimulate the otolith organs is ultrasonic bone stimulation (UBS) of the mastoid. To test the hypothesis that UBS can augment MSNA we measured leg MSNA, heart rate, and arterial blood pressure during gravitational stimulation of the otolith organs by HDR and during stimulation of the mastoid via UBS in 14 healthy subjects (4 men and 10 women; age: 25 ± 4 yr; BMI: 24 ± 4 kg/m2). UBS of the mastoid elicited a significant increase in leg MSNA (3 ± 1 bursts/min, 31 ± 10% total activity; P < 0.05). This increase in MSNA via UBS was comparable to HDR (4 ± 1 bursts/min, 35 ± 8% total activity; P < 0.05). UBS of the clavicle (n=10), which served as a control, did not increase MSNA. In all studies, HDR and UBS did not change heart rate or mean arterial blood pressure. These results indicate that UBS stimulation can elicit sympathetic outflow and may assist in maintaining peripheral resistance and arterial blood pressure during orthostatic challenges. [ABSTRACT FROM AUTHOR]
- Published
- 2013
38. Astrocytes play a key role in activation of microglia by persistent Borna disease virus infection
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Sauder Christian, Moldovan Krisztina, Wolbert Candie, Ayhan Yavuz, Ovanesov Mikhail V, and Pletnikov Mikhail V
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Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Abstract Neonatal Borna disease virus (BDV) infection of the rat brain is associated with microglial activation and damage to certain neuronal populations. Since persistent BDV infection of neurons is nonlytic in vitro, activated microglia have been suggested to be responsible for neuronal cell death in vivo. However, the mechanisms of activation of microglia in neonatally BDV-infected rat brains remain unclear. Our previous studies have shown that activation of microglia by BDV in culture requires the presence of astrocytes as neither the virus nor BDV-infected neurons alone activate microglia. Here, we evaluated the mechanisms whereby astrocytes can contribute to activation of microglia in neuron-glia-microglia mixed cultures. We found that persistent infection of neuronal cells leads to activation of uninfected astrocytes as measured by elevated expression of RANTES. Activation of astrocytes then produces activation of microglia as evidenced by increased formation of round-shaped, MHCI-, MHCII- and IL-6-positive microglia cells. Our analysis of possible molecular mechanisms of activation of astrocytes and/or microglia in culture indicates that the mediators of activation may be soluble heat-resistant, low molecular weight factors. The findings indicate that astrocytes may mediate activation of microglia by BDV-infected neurons. The data are consistent with the hypothesis that microglia activation in the absence of neuronal damage may represent initial steps in the gradual neurodegeneration observed in brains of neonatally BDV-infected rats.
- Published
- 2008
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39. In situ X-ray microtomography characterization of damage in SiCf/SiC minicomposites
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Chateau, C., Gélébart, L., Bornert, M., Crépin, J., Boller, E., Sauder, C., and Ludwig, W.
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- *
CERAMIC-matrix composites , *TOMOGRAPHY , *X-rays , *CONTINUUM damage mechanics , *COMPOSITE materials - Abstract
Abstract: The purpose of the present study is to characterize matrix crack propagation and fiber breaking occurrences within SiC/SiC minicomposite in order to validate later on a multiscale damage model at the local scale. An in situ X-ray microtomography tensile test was performed at the European Synchrotron Radiation Facility (ESRF, ID19 beamline) in order to obtain 3-dimensional (3D) images at six successive loading levels. Results reveal a slow and discontinuous propagation of matrix cracks, even after the occurrence of matrix crack saturation. A few fiber failures were also observed. However, radiographs of the whole length (14mm) of the minicomposites under a load and after the failure were more appropriate to get statistical data about fiber breaking. Thus, observations before the ultimate failure revealed only a few fibers breaking homogeneously along the minicomposite. In addition, an increase in fiber breaking density in the vicinity of the fatal matrix crack was observed after failure. These experimental results are discussed in regards to assumptions used in usual 1-dimensional (1D) models for minicomposites. [Copyright &y& Elsevier]
- Published
- 2011
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40. Assessing Silicon Carbide Ceramics and Composites for Energy-Related Applications
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Martin Steinbrueck, Antonio Rinaldi, Matteo Scafè, Cédric Sauder, Karsten Klemens Hansen, Claudio Mingazzini, James Braun, Mingazzini, C., Sauder, C., Braun, J., Scafe, M., Rinaldi, A., Hansen, K. K., and Steinbrueck, M.
- Subjects
Process (engineering) ,Computer science ,020209 energy ,02 engineering and technology ,Silicon carbide ,SiCf/SiC composites ,Raw material ,chemistry.chemical_compound ,SiCf/SiC composite ,Reliability (semiconductor) ,Concentrated solar power ,0202 electrical engineering, electronic engineering, information engineering ,helium Gas-cooled Fast Reactor (GFR) ,Ceramic ,Process engineering ,business.industry ,Concentrated Solar Power (CSP) ,Renewable energy ,chemistry ,Chemical Vapour Infiltration (CVI) ,Chemical Vapour Deposition (CVD) ,visual_art ,Sustainability ,visual_art.visual_art_medium ,business - Abstract
Silicon carbide ceramics are really appreciated in energy applications, especially when extreme environments are involved. Their reliability and thermomechanical performances beyond 1000°C are higher than that of superalloys, therefore they may significantly contribute to the reduction of Critical Raw Materials use, which is a crucial point for sustainability issues. The examples discussed in the present paper are taken from European projects, in the field of nuclear energy (IV gen fission nuclear reactors) and renewable energy production (Concentrated Solar Power) and demonstrate a common approach based on optimizing and assessing the ceramic materials, considering current international standards, but also prenormative research and accelerated ageing tests in expected working environments. In this way, together with a simultaneous process implementation for the production of components in the size and geometry required for the applications, high target TRL (5-7) can be demonstrated, creating the competencies, the methods and the results needed for subsequent industrialisation. İ 2018 IEEE.
- Published
- 2018
41. "Normal" tissue adjacent to breast cancer is not normal.
- Author
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Clare, S. E., Pardo, I., Mathieson, T., Lillemoe, H. A., Blosser, R. J., Choi, M., Sauder, C. A. M., Doxey, D. K., Badve, S., Storniolo, A. M. V., Atale, R., and Radovich, M.
- Subjects
- *
GENE expression , *PANCREATIC cancer , *BREAST cancer , *TUMORS , *CARCINOGENESIS - Abstract
Background: Gene expression data from pancreatic cancer, histologically normal tissue adjacent to the cancer and normal pancreas reveals that adjacent normal has already acquired a number of transcriptional alterations and is not, therefore, an appropriate baseline for comparison with cancers. (Gadaleta et al., 2011) The purpose of this study was to determine if this is also the case for breast cancer and, if so, to identify the differences in gene expression between adjacent normal and normal breast. Methods: RNA-Seq data from breast cancer and adjacent normal was downloaded from the TCGA (The Cancer Genome Atlas) data portal. The epithelia from 20 frozen tissue cores from healthy premenopausal donors to the Susan G. Komen for the the Cure® Tissue Bank at the IU Simon Cancer Center were microdissected and the RNA isolated. RNA-seqeuncing was carried out using the Life Technologies SOLiD Platform. RPKM gene expression values from TCGA and sequencing of the Komen normal tissues were merged, quantile normalized, and batch effect corrected. Normalization and differential gene expression was performed using Partek Genomics Suite. Results: Principal component analysis (PCA) reveals complete separation between adjacent normal and healthy normal breast tissue. Setting a maximum FDR (false discover rate) of 5%, 2239 genes are differentially expressed between adjacent normal and healthy normal. Ingenuity pathway analysis reveals that the Fos, Jun and TGFbeta pathways are active in the adjacent normal. Conclusions: Tissue adjacent to a primary breast cancer is not normal when using healthy breast tissue as a comparator. As RNA-Seq data is digital, it is possible to quantify the changes in gene expression starting from healthy normal to normal adjacent to tumor to tumor. Increasing and decreasing gene expression values provide clues to the fundamental molecular changes occurring in histologically normal appearing adjacent tissue. The differences in gene expression we have identified are some of the earliest changes in breast carcinogenesis and provide insight into the etiology of this disease and, potentially, its prevention. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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42. The Impact of Xanomeline and Trospium Chloride on Cognitive Impairment in Acute Schizophrenia: Replication in Pooled Data From Two Phase 3 Trials.
- Author
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Horan WP, Sauder C, Harvey PD, Ramsay IS, Yohn SE, Keefe RSE, Davis VG, Paul SM, and Brannan SK
- Abstract
Objective: Xanomeline and trospium chloride (formerly known as KarXT), a novel M
1 /M4 muscarinic receptor agonist, demonstrated efficacy across phase 2 and 3 trials as monotherapy for the treatment of inpatients with acute schizophrenia on the Positive and Negative Syndrome Scale total score primary endpoint. In the phase 2 trial, xanomeline/trospium improved performance on a cognitive outcome measure in the subgroup of participants with clinically significant baseline cognitive impairment. The authors sought to confirm this finding using data from two phase 3 trials., Methods: Data were pooled from two 5-week inpatient trials of xanomeline/trospium monotherapy in patients with acute schizophrenia. The statistical analysis plan prespecified comparisons of cognitive composite score changes between xanomeline/trospium and placebo in the full sample and the cognitively impaired (≤1 SD below norms at baseline) subgroup., Results: There was no significant xanomeline/trospium effect in the full sample (N=357); however, in the impaired subgroup, xanomeline/trospium (N=71) had a significantly greater benefit for cognition compared with placebo (N=66; least squares mean difference=0.31, SE=0.10; d=0.54). The xanomeline/trospium effect size increased significantly with a more stringent baseline impairment threshold (≤-1.5 SD; d=0.80). Improvements in cognition were minimally correlated with concurrent changes in total, positive, and negative symptoms in both treatment groups., Conclusions: Participants with acute schizophrenia with prespecified impairments demonstrated significant cognitive improvement with xanomeline/trospium compared with placebo. This result directly confirms earlier findings. This benefit is not attributable to changes in symptoms, despite substantial evidence of efficacy for psychosis. Evaluation of xanomeline/trospium's potential for cognitive enhancement in a well-controlled trial of stable patients with cognitive impairment is warranted., Competing Interests: Dr. Horan, Dr. Sauder, Dr. Ramsay, and Dr. Yohn are employees of Bristol Myers Squibb. Dr. Harvey has received consulting fees or travel reimbursement from Alkermes, Boehringer-Ingelheim, Bristol Myers Squibb, Karuna Therapeutics, Merck, Minerva Neuroscience, and Sunovion/DSP; he has received royalties for the Brief Assessment of Cognition in Schizophrenia (owned by WCG); and he is chief scientific officer of i-Function, Inc., and a scientific consultant for EMA Wellness, Inc. Dr. Ramsay holds and is owed restricted stock units at Bristol Myers Squibb. Dr. Keefe has served as a consultant for Biogen, Boehringer-Ingelheim, Bristol Myers Squibb, Gedeon Richter, Neurocrine Pangea, Recognify, Sirtsei, Vandria, and WCG; he has received royalties for the BACS, SCoRS, and VRFCAT; he has received support from Boehringer Ingelheim for attending meetings and/or travel; and he has participated in data safety monitoring boards or advisory boards for Boehringer-Ingelheim, Karuna, Merck, and Neurocrine. Dr. Davis has served as a consultant for Abyrx, Arkana Laboratories, Boehringer Ingelheim, Bristol Myers Squibb, Eikonoklastes Therapeutics, Harm Reduction Therapeutics, LyGenesis, Renerva, University of North Carolina School of Medicine, Division of Nephropathology, and VeraSci. Dr. Paul was an employee of and had a leadership/fiduciary role at Karuna Therapeutics at the time this research was conducted, and he has a leadership/fiduciary role at Sage Therapeutics and Voyager Therapeutics; he holds equity in Eli Lilly, NeuMarker, Rapport Therapeutics, Sage Therapeutics, Seaport Therapeutics, and Voyager Therapeutics. Dr. Brannan was an employee of Karuna Therapeutics at the time this research was conducted and is currently a consultant for Bristol Myers Squibb.- Published
- 2024
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43. Inter-rater and Intra-rater Reliability of Glottal Image Capture: A Mobile Application to Quantify Vocal Fold Bowing.
- Author
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Aboueisha M, Jaleel Z, Baertsch HC, Sauder C, Merati AL, Johns MM, and Bhatt NK
- Abstract
Background: Age-related vocal atrophy (ARVA) causes vocal fold bowing, impacting communication and quality of life. The assessment of vocal fold bowing is largely subjective. Glottal Image Capture (GlottIC) is a new mobile application that helps quantify vocal fold bowing. We aim through this study to assess its reliability, compare it to manual calculation method, and compare differences between visual-perceptual bowing severity ratings., Methods: Ten raters independently quantified Bowing Index (BI) using GlottIC from 10 videostroboscopic images among individuals with ARVA. There was 100% duplication of images to facilitate intra-rater reliability analyses using Pearson's correlation. Inter-rater reliability was quantified using Intraclass Correlation Coefficient (ICC) for experienced and novice raters. The correlation between manual calculations using ImageJ and GlottIC was analyzed., Results: The intra-rater reliability for total BI was strong (r = 0.822, p < 0.001). The inter-rater reliability for BI, calculated using ICC, was (ICC = 0.720; 95% CI: 0.579-0.852), indicating good consistency among the raters. Experts had higher ICC (ICC = 0.808; 95% CI: 0.678-0.906) compared to novice raters (ICC = 0.651; 95% CI: 0.468-0.816). There was a positive correlation between GlottIC and manual BI (r = 0.811, p < 0.001). As the BI increased, the bowing severity, based on visual-perceptual ratings, also increased (p < 0.001)., Conclusion: GlottIC is a reliable mobile application that can quantify vocal fold bowing in patients with ARVA with high intra- and inter-rater reliability. GlottIC BI measurments are highly correlated with manual BI and visual-perceptual ratings of bowing severity. Further improvements in reliability may be achieved with more robust rater training and automated technologies., Level of Evidence: Level 3 Laryngoscope, 2024., (© 2024 The American Laryngological, Rhinological and Otological Society, Inc.)
- Published
- 2024
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44. Efficacy of xanomeline and trospium chloride in schizophrenia: pooled results from three 5-week, randomized, double-blind, placebo-controlled, EMERGENT trials.
- Author
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Kaul I, Sawchak S, Claxton A, Sauder C, Hassman HH, Kakar R, Walling DP, Citrome L, Zhu H, Miller AC, and Brannan SK
- Abstract
In the 5-week, randomized, double-blind, placebo-controlled EMERGENT-1 (NCT03697252), EMERGENT-2 (NCT04659161), and EMERGENT-3 (NCT04738123) trials, xanomeline and trospium chloride (formerly known as KarXT) significantly improved symptoms of schizophrenia and was generally well tolerated. We pooled data from the EMERGENT trials to further characterize the efficacy of xanomeline/trospium and provide sufficient statistical power to analyze responses in participant subgroups. In pooled analyses, xanomeline/trospium significantly improved Positive and Negative Syndrome Scale (PANSS) total score at week 5 versus placebo (least squares mean difference, -9.9; 95% confidence interval, -12.4, -7.3; p < 0.0001; Cohen's d effect size, 0.65). PANSS subscale and Clinical Global Impression-Severity scores also improved significantly with xanomeline/trospium versus placebo. Subgroup analyses consistently favored xanomeline/trospium over placebo regardless of differences in participant age, sex, race, body mass index, and baseline PANSS total score. These results add to existing evidence demonstrating robust and reliable improvements in symptoms with xanomeline/trospium across a broad spectrum of people with schizophrenia., (© 2024. The Author(s).)
- Published
- 2024
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45. Endoscopic Distance and its Impact on Quantified Age-related Vocal Fold Atrophy Measures.
- Author
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Aboueisha MA, Sauder C, Jaleel Z, Fatahallah Y, Adcock K, Al-Awadi H, Jafari A, and Bhatt NK
- Subjects
- Humans, Aged, Female, Male, Aged, 80 and over, Stroboscopy methods, Video Recording, Vocal Cords pathology, Vocal Cords diagnostic imaging, Laryngoscopy methods, Atrophy pathology
- Abstract
Introduction: The bowing index (BI) and normalized glottal gap area (NGGA) are used to quantify vocal fold morphology in ARVA; however, the influence of the distance between the flexible laryngoscope lens and the target area is not known. The goal is to test whether the endoscopic distance impacts vocal fold morphology measurements in patients with ARVA during flexible video laryngostroboscopy (VLS)., Method: Patients with ARVA who underwent VLS were included. Images were classified into near (close to the petiole of the epiglottis) and far (below nasopharynx, with tongue base and entire epiglottis visible) conditions. BI was calculated using a mobile application, and NGGA was measured using ImageJ., Results: This study included 23 patients; the mean age was 77 ± 7 years. Mean BI measured at the near distance was higher than far distances with a mean difference of 1.94 (95% CI: 0.92-2.96, p = 0.001). NGGA showed difference with changed distance -0.24 (95% CI: -0.48 to 0.01, p < 0.05).When stratifying patients into two groups based on median BI measurement, there was a statistically significant difference between near and far conditions, with increased BI in the near condition for patients above the median (p < 0.05), but no difference between the near and far condition for patients with BI below the median., Conclusion: The BI and NGGA were impacted by the endoscopic distance during flexible VLS. BI was significantly higher in the near condition compared with the far condition. The difference in BI between the near and far conditions was more pronounced when the vocal fold bowing was greater. These findings call for heightened awareness of measurement discrepancies secondary to the endoscopic distance during flexible laryngostroboscopy., Level of Evidence: 2 Laryngoscope, 134:4649-4655, 2024., (© 2024 The American Laryngological, Rhinological and Otological Society, Inc.)
- Published
- 2024
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46. Quantifying Health Utility of Age-related Vocal Atrophy.
- Author
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de Leon JA, Cvancara DJ, Carlson AL, Cheng A, Rizvi ZH, Giliberto JP, Sauder C, and Bhatt NK
- Abstract
Objective: Age-related vocal atrophy (ARVA) negatively impacts voice and quality of life (QOL). This study aims to determine utility-based QOL in ARVA patients, correlate findings with traditional patient-reported outcome measures (PROMs), and generate utility-based inferences., Methods: Forty ARVA patients were prospectively recruited from a tertiary care center. Health utility was measured using standard gamble, time trade-off, and visual analog scale, assessing participants' current health states relative to defined comparison states (blindness/death). Traditional PROMs (Voice Handicap Index-10 [VHI-10] and Voice-Related Quality of Life Scale [V-RQOL]) were also collected. Descriptive and paired statistics were performed to determine health utility, and Pearson correlation assessed the association between PROMs and health utilities., Results: Mean health utility in ARVA was 0.84 ± 0.22, 0.88 ± 0.17, and 0.62 ± 0.25 using standard gamble, time trade-off, and visual analog scale, respectively. There were positive correlations between V-RQOL and time trade-off (r = 0.66; p < 0.0001) as well as with standard gamble (r = 0.47; p = 0.002). Participants with ARVA reported no difference in health utility impact between their voice impairment and monocular blindness (Mean dif 10.9; 95% CI -1.6, 23.5; p = 0.101). Patients with ARVA were willing to part with an average 4.6 ± 6.1 years of life to restore normal voice., Conclusions: ARVA patients view their voice impairment as a significant health decrement, comparable to monocular blindness. These findings underscore the substantial impact of ARVA on QOL and highlight the need for continued research and new therapies., Level of Evidence: 4 Laryngoscope, 2024., (© 2024 The American Laryngological, Rhinological and Otological Society, Inc.)
- Published
- 2024
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47. Clipping the Positive Lymph Node in Patients with Clinically Node Positive Breast Cancer Treated with Neoadjuvant Chemotherapy: Impact on Axillary Surgery in the ISPY-2 Clinical Trial.
- Author
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Switalla KM, Boughey JC, Dimitroff K, Yau C, Ladores V, Yu H, Tchou J, Golshan M, Ahrendt G, Postlewait LM, Piltin M, Reyna CR, Matsen CB, Tuttle TM, Wallace AM, Arciero CA, Lee MC, Tseng J, Son J, Rao R, Sauder C, Naik A, Howard-McNatt M, Lancaster R, Norwood P, Esserman LJ, and Mukhtar RA
- Subjects
- Humans, Female, Middle Aged, Retrospective Studies, Follow-Up Studies, Lymph Nodes pathology, Lymph Nodes surgery, Survival Rate, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Prognosis, Lymphatic Metastasis, Adult, Aged, Sentinel Lymph Node pathology, Sentinel Lymph Node surgery, Chemotherapy, Adjuvant, Surgical Instruments, Breast Neoplasms pathology, Breast Neoplasms surgery, Breast Neoplasms drug therapy, Breast Neoplasms therapy, Neoadjuvant Therapy, Axilla, Lymph Node Excision, Sentinel Lymph Node Biopsy
- Abstract
Background: For patients with clinically node-positive (cN+) breast cancer undergoing neoadjuvant chemotherapy (NAC), retrieving previously clipped, biopsy-proven positive lymph nodes during sentinel lymph node biopsy [i.e., targeted axillary dissection (TAD)] may reduce false negative rates. However, the overall utilization and impact of clipping positive nodes remains uncertain., Patients and Methods: We retrospectively analyzed cN+ ISPY-2 patients (2011-2022) undergoing axillary surgery after NAC. We evaluated trends in node clipping and associations with type of axillary surgery [sentinel lymph node (SLN) only, SLN and axillary lymph node dissection (ALND), or ALND only] and event-free survival (EFS) in patients that were cN+ on a NAC trial., Results: Among 801 cN+ patients, 161 (20.1%) had pre-NAC clip placement in the positive node. The proportion of patients that were cN+ undergoing clip placement increased from 2.4 to 36.2% between 2011 and 2021. Multivariable logistic regression showed nodal clipping was independently associated with higher odds of SLN-only surgery [odds ratio (OR) 4.3, 95% confidence interval (CI) 2.8-6.8, p < 0.001]. This was also true among patients with residual pathologically node-positive (pN+) disease. Completion ALND rate did not differ based on clip retrieval success. No significant differences in EFS were observed in those with or without clip placement, both with or without successful clip retrieval [hazard ratio (HR) 0.85, 95% CI 0.4-1.7, p = 0.7; HR 1.8, 95% CI 0.5-6.0, p = 0.3, respectively]., Conclusion: Clip placement in the positive lymph node before NAC is increasingly common. The significant association between clip placement and omission of axillary dissection, even among patients with pN+ disease, suggests a paradigm shift toward TAD as a definitive surgical management strategy in patients with pN+ disease after NAC., (© 2024. The Author(s).)
- Published
- 2024
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48. Disparities in the Occurrence of Long-Term Effects of Bone Marrow Suppression after Treatment in Adolescent Young Adult Breast Cancer Survivors.
- Author
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Bellini A, Keegan THM, Li Q, Maguire FB, Lyo V, and Sauder C
- Subjects
- Humans, Female, Adolescent, Young Adult, Adult, Follow-Up Studies, Prognosis, Survival Rate, Anemia epidemiology, Sepsis etiology, Sepsis epidemiology, Incidence, California epidemiology, Bone Marrow Diseases epidemiology, Bone Marrow Diseases etiology, Thrombocytopenia epidemiology, Thrombocytopenia etiology, Breast Neoplasms pathology, Cancer Survivors statistics & numerical data
- Abstract
Background: Many adolescent and young adult (AYA) patients with breast cancer (BC) receive adjuvant therapy as initial treatment, with long-term bone marrow suppression as a potential complication, but no studies have evaluated the impact of race/ethnicity on the development of bone marrow suppression in AYA BC survivors., Patients and Methods: Female patients ages 15-39 years diagnosed with BC (2006-2018) and surviving ≥ 2 years were identified from the California Cancer Registry and linked to statewide hospitalization data. We estimated the cumulative incidence of developing late effects of bone marrow suppression, such as leukopenia, anemia, thrombocytopenia, bleeding, and infection/sepsis, during hospital discharge diagnoses present ≥ 2 years after diagnosis. We examined the impact of sociodemographic and clinical factors on late effects using multivariate Cox proportional hazards regression., Results: Of 11,293 patients, 42.8% were non-Hispanic (nH) White, 28.8% Hispanic, 19.5% nH Asian/Pacific Islander, and 7.5% nH Black. In multivariable analyses, nH Blacks had the highest risk (versus nH Whites) of anemia [hazard ratio (HR) 1.72, 95% confidence interval (CI) 1.47-2.02], leukopenia (HR 1.56, CI 1.14-2.13), thrombocytopenia (HR 1.46, CI 1.08-1.99), major infection/sepsis (HR 1.64, CI 1.4-1.92), and bleeding (HR 1.89, CI 1.39-2.58). Hispanics had a higher risk of developing anemia (HR 1.17, CI 1.04-1.32), bleeding (HR 1.4, CI 1.12-1.76), and major infections/sepsis (HR 1.36, CI 1.21-1.52). Asian/Pacific Islanders had only a higher risk of developing bleeding (HR 1.33, CI 1.03-1.72). Patients from a low neighborhood socioeconomic status had a 20% higher risk of infection/sepsis (HR 1.21, CI 1.1-1.34), but there were no associations for the other late effects., Conclusions: We identified that AYAs of nH Black, Hispanic, and Asian/Pacific Islander race/ethnicity are at an increased risk of several late effects after adjuvant therapy compared with nH White patients. From these data, providers can implement early/frequent screening of hematologic late effects in these high-risk survivors., (© 2024. Society of Surgical Oncology.)
- Published
- 2024
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49. Datopotamab-deruxtecan in early-stage breast cancer: the sequential multiple assignment randomized I-SPY2.2 phase 2 trial.
- Author
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Khoury K, Meisel JL, Yau C, Rugo HS, Nanda R, Davidian M, Tsiatis B, Chien AJ, Wallace AM, Arora M, Rozenblit M, Hershman DL, Zimmer A, Clark AS, Beckwith H, Elias AD, Stringer-Reasor E, Boughey JC, Nangia C, Vaklavas C, Omene C, Albain KS, Kalinsky KM, Isaacs C, Tseng J, Roussos Torres ET, Thomas B, Thomas A, Sanford A, Balassanian R, Ewing C, Yeung K, Sauder C, Sanft T, Pusztai L, Trivedi MS, Outhaythip A, Li W, Onishi N, Asare AL, Beineke P, Norwood P, Brown-Swigart L, Hirst GL, Matthews JB, Moore B, Fraser Symmans W, Price E, Beedle C, Perlmutter J, Pohlmann P, Shatsky RA, DeMichele A, Yee D, van 't Veer LJ, Hylton NM, and Esserman LJ
- Abstract
Among the goals of patient-centric care are the advancement of effective personalized treatment, while minimizing toxicity. The phase 2 I-SPY2.2 trial uses a neoadjuvant sequential therapy approach in breast cancer to further these goals, testing promising new agents while optimizing individual outcomes. Here we tested datopotamab-deruxtecan (Dato-DXd) in the I-SPY2.2 trial for patients with high-risk stage 2/3 breast cancer. I-SPY2.2 uses a sequential multiple assignment randomization trial design that includes three sequential blocks of biologically targeted neoadjuvant treatment: the experimental agent(s) (block A), a taxane-based regimen tailored to the tumor subtype (block B) and doxorubicin-cyclophosphamide (block C). Patients are randomized into arms consisting of different investigational block A treatments. Algorithms based on magnetic resonance imaging and core biopsy guide treatment redirection after each block, including the option of early surgical resection in patients predicted to have a high likelihood of pathological complete response, the primary endpoint. There are two primary efficacy analyses: after block A and across all blocks for the six prespecified breast cancer subtypes (defined by clinical hormone receptor/human epidermal growth factor receptor 2 (HER2) status and/or the response-predictive subtypes). We report results of 103 patients treated with Dato-DXd. While Dato-DXd did not meet the prespecified threshold for success (graduation) after block A in any subtype, the treatment strategy across all blocks graduated in the hormone receptor-negative HER2
- Immune- DNA repair deficiency- subtype with an estimated pathological complete response rate of 41%. No new toxicities were observed, with stomatitis and ocular events occurring at low grades. Dato-DXd was particularly active in the hormone receptor-negative/HER2- Immune- DNA repair deficiency- signature, warranting further investigation, and was safe in other subtypes in patients who followed the treatment strategy. ClinicalTrials.gov registration: NCT01042379 ., (© 2024. The Author(s), under exclusive licence to Springer Nature America, Inc.)- Published
- 2024
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50. Does Implicit Racial Bias Affect Auditory-Perceptual Evaluations of Dysphonic Voices?
- Author
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Norotsky RL, Dahl KL, Cocroft S, Sauder C, Tracy LF, and Stepp CE
- Abstract
Purpose: The purpose of this study was to understand the role of implicit racial bias in auditory-perceptual evaluations of dysphonic voices by determining if a biasing effect exists for novice listeners in their auditory-perceptual ratings of Black and White speakers., Method: Thirty speech-language pathology graduate students at Boston University listened to audio files of 20 Black speakers and 20 White speakers of General American English with voice disorders. Listeners rated the overall severity of dysphonia of each voice heard using a 100-unit visual analog scale and completed the Harvard Implicit Association Test (IAT) to measure their implicit racial bias., Results: Both Black and White speakers were rated as less severely dysphonic when their race was labeled as Black. No significant relationship was found between Harvard IAT scores and differences in severity ratings by race labeling condition., Conclusions: These findings suggest a minimizing bias in the evaluation of dysphonia for Black patients with voice disorders. These results contribute to the understanding of how a patient's race may impact their visit with a clinician. Further research is needed to determine the most effective interventions for implicit bias retraining and the additional ways that implicit racial bias impacts comprehensive voice evaluations., Competing Interests: Declaration of Competing Interest C.E. Stepp has received consulting fees from Altec, Inc. and Delsys, Inc., companies focused on developing and commercializing technologies related to human movement. Stepp's interests were reviewed and are managed by Boston University in accordance with their conflict of interest policies., (Copyright © 2023 The Voice Foundation. Published by Elsevier Inc. All rights reserved.)
- Published
- 2023
- Full Text
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