Bibliografías temáticas / SiC

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Literatura académica sobre el tema "SiC"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 7 de julio de 2024

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Artículos de revistas sobre el tema "SiC"

1

Verma, Ajay, J. Singh, V. Kumar, A. S. Kharab y G. P. Singh. "Non parametric measures to estimate GxE interaction of dual purpose barley genotypes for grain yield under multi-location trials". Journal of Applied and Natural Science 9, n.º 4 (1 de diciembre de 2017): 2332–37. http://dx.doi.org/10.31018/jans.v9i4.1532.

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GxE interaction of seventeen dual purpose barley genotypes evaluated at ten major barley locations of the country by non parametric methods. Non parametric measures had been well established and expressed ad-vantages over their counter parts i.e. parametric measures. Simple descriptive measures based on the ranks of gen-otypes i.e. Mean of ranks (MR) pointed towards RD2925 and BH1008 and standard deviation of ranks (SD) for KB1401 and UPB1054 whereas Coefficient of variation (CV) for JB322 and RD2925 as stable genotypes. Nonpara-metric measures based on original values (Si1, Si2, Si3, Si4, Si5, Si6, Si7) indicated the stable performance of NDB1650, JB322 and UPB1054 while UPB1053, RD2715, RD2927 and RD2035 were observed of unstable nature. CSi1, CSi2, CSi3, CSi4, CSi5, CSi6 and CSi7 measures based on the ranks of corrected grain yield identified JB322, RD2552, RD2925 and NDB1650 as stable genotypes. Spearman’s rank correlation established highly significant positive correlation of yield with SD (0.67), Si1(0.65), Si2(0.59), Si5(0.68), Si7(0.67) whereas negative association observed for CMR (Mean of corrected ranks) (-0.62), CMed (Median of corrected ranks) (-0.60). NPi(2) expressed negative correlation with CV(-0.32), Si6 (-0.30), CMR(-0.34) and CMed(-0.48). More over NPi(3) maintained negative correlation with most of the measures though the magnitude was of low magnitude.
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Verma, Ajay, RPS Verma RPS Verma, J. Singh J Singh, Lokendra Kumar y Gyanendra Pratap Singh. "Genotype X Environment Interactions of Fodder Barley Genotypes as Estimated by Ammi, Blup and Non Parametric Measures". Current Agriculture Research Journal 10, n.º 2 (10 de septiembre de 2022): 46–54. http://dx.doi.org/10.12944/carj.10.2.02.

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Field experiments were carried out at six locations in Northern Hill Zone to evaluate twenty three promising fodder barley genotypes in a randomized complete block design (RCBD) during 2020-21 cropping seasons . Using analytic methods Additive Main Effects and Multiplicative Interactions (AMMI), Best Linear Unbiased Predictor (BLUP) along with Non Parametric compared to decipher the GxE interactions under multi environment trials. Highly significant about 67.5% variations accounted by environments, 14.1% of GxE interactions and marginally 3.2% by the genotypes in the total sum square of variations for yield the present study. AMMI1 explained 53.7%, 32.1% by AMMI2, 6.9% for AMMI3, AMMI4 accounted for 4.8% respectivelyof a total variation. ASV and ASV1 measures considered 85.9% of the total variation identified G4, G5, G9 genotypes. MASV1 exploited 97.7% of interactions favoured for G18, G15, G8 genotypes. BLUP-based settled for G6, G11, G5 genotypes. Non parametric measures found G9, G8, G1 as suitable genotypes. Further non parametric composites measures selected G9, G4, G8 as suitable genotypes. Measures Si1, Si2, Si3, Si4, Si5,Si6 ,Si7, HMPRVG, ASV1, ASV, accounted more in first principal component whereas NPi (1), NPi (2), NPi (3), NPi (4), PRVG, Si1, GM, Mean, Average were major contributors in second principal component. Very tight positive relationships observed for IPC3, IPC1with BLUP based measures GM, HM, PRVG, HMPRVG, Average in one quadrant. CV closely related to Stdev, IPC2, IPC4 in opposite quadrant. ASV, ASV1 expressed very tight association with Si6,Si7 whereas NPi(1) , exhibited close affinity with Si1 , Si4, Si2 ,Si5 values. Methods utilized in study showed high to moderate degree of association among themselves, however non parametric measures would be recommended for multi environment trials.
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Verma, Ajay y Gyanendra Pratap Singh. "Emulations of AMMI, BLUP and non-parametric measures to decipher GXE interaction of wheat genotypes evaluated in CZ". INTERNATIONAL JOURNAL OF AGRICULTURAL SCIENCES 18, n.º 2 (15 de junio de 2022): 666–74. http://dx.doi.org/10.15740/has/ijas/18.2/666-674.

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AMMI analysis observed highly significant variations due to environments, GxE interactions, and genotypes with,respective 63.2% 18.3% 5.5% towards the total sum square of variations. Absolute IPCA-1 scores pointed for G 2, G4, G7 as per IPCA-2, genotypes G8, G2 G7 would be of choice. ASV and ASV1 measures utilized 54.5% of interaction sum of squares recommended (G2, G7, G3). 96.9% of interaction effects utilized by MASV and MASV1 settled for G7, G2, G13 genotypes. BLUP-based HMGV RPGV HMRPGV measures pointed for G3, G13, G8 genotypes. Non parametric measures NPi(1) observed suitability of G13, G9 whereas NPi(2), NPi(3) NPi(4) identified G7, G10 wheat genotypes. First two significant principal components accounted for 68.5% of the total variation in the AMMI, BLUP and non-parametric measures in biplot analysis. Measures BLHM, MHPRVG, BLGM,PRVG, HM, Average, BLAvg accounted more of share in first component whereas NPi(2), NPi(3), NPi(4) Si1 ,Si2 BLStdev Si4 were major contributors for second component. Clustering analysis observed the group of average, GAI, HM and BLAvg, BLHM, BLGM, PRVG, MHPRVG measures along with second cluster of CV, BLCV, Stdev, BLStdev , IPC1 placed in one quadrant. AMMI based measures ASV, ASV1, MASV, MASV1 clustered with non-parametric measures NPi(1), Si1, Si2, Si3, Si4, Si5, Si6, Si7 in bigger cluster.
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Verma*, Ajay, Bhudev Singh Tyagi y Gyanendra Singh. "Experimental and Biological Approaches for Genotype X Environment Interactions Estimation for Wheat Genotypes Evaluated Under Multi Locational Trials". Current Agriculture Research Journal 12, n.º 1 (20 de abril de 2024): 242–52. http://dx.doi.org/10.12944/carj.12.1.20.

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Genotypes VL907, HS562, HPW484 were ranked as topped three in comparison to the other during the evaluation of nine wheat genotypes at major locations of the north hills zone of the country under rain fed conditions. The least values of AMMI stability measure (ASV) had expressed the desirability of HPW484, HS562, VL2041 genotypes whereas the genotypes HS562, HPW484, VL2041 had been identified by least values of Modified Ammi Stability Value (MASV). The minimum value of simultaneous selection index measure based on the MASV (ssiMASV) had selected HS562, HPW484, VL2041 wheat genotypes while values of ssiWAASB measure found the suitability of HPW484, HS562, HS691 wheat genotypes. The composite non parametric measure NPi (2) had favoured the VL892, HS562 genotypes and values of NPi (3) measure had settled for VL892, HS562 genotypes while VL892, HPW349 wheat genotypes had been pointed by the last composite measure NPi (4). The Ward’s method of Hierarchical Clustering had placed the VL907 genotype in a separate group as compared to others. The shorter rays of measures IPC2, IPC5, IPC3, SD had reflected the less contribution of the joint effects of genotypes and measures in the biplot analysis. Non parametric composite measure NPi (1) had expressed tight direct relation with Si1,Si3,Si4,Si5,Si6,Si7 values. The values of IPC6 & IPC4 had maintained the direct association with BLUP based analytic measures HMGV, RPGV, HMPRVG*Meanb, GAI, Meanb, RPGV*Meanb values. Moreover the values of CV measure had clustered with Si2, Si3, Si4,Si5, Si7 measures of this study.
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Meena, R. P., Ajay Verma y S. C. Tripathi. "Wheat Yield and Important Traits Influenced by Interaction of Potassium and Irrigation Levels Evaluated at Number of Locations in the Country by AMMI Analysis and Non-Parametric Measures". Environment and Ecology 41, n.º 3D (septiembre de 2023): 2089–98. http://dx.doi.org/10.60151/envec/pwpy1898.

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AMMI analysis of treatments consisted of levels of potassium with irrigations observed highly significant effects of locations, treatments, and T×L interactions for wheat yield. About 53.4% of the total variations in yield values was due to locations followed by 26.3% and 10.8% by treatments and interactions effects. Further analysis found 59.7% contributed by AMMI1 while 17.2% and 9.4% by AMMI2 and AMMI3 components for thousands grain weight as total of first two components cumulative to 76.9% of the total variation. The sums of squares for G×E signal and noise were 56.7% and 43.3% of interaction effects for grains per spike as the sum of squares of T×L signal was 2.58 times of treatments effects and IPC1 alone was 3.54 times the treatments effects. Measures ASV and ASV1 recommended T6, T5, T4 for wheat yield while measures utilized 81.6% of interaction sum of squares whereas MASV and MASV1 measures based on 98.4% identified T3, T5, T8, T4 treatments. Maximum average for thousands grains weight; GAI selected T8, T9, T6 whereas as per HM values treatments T5, T2, T8 would be more desirable. Grains per spike found the measures RPGV and HMRPGV settled for T8, T9, T5 treatments. Non parametric measures for yield observed Si1 selected T3, T2, T5 as opposed to T6, T4, T1 by Si2 values. T6, T4, T1 genotypes considered by Si3 Si4 measure considered T6, T4, T1 next Si5 for T6, T3, T4 and Si6 pointed towards T6, T4, T8 genotypes while Si7 favored T6, T1, T4 genotypes. Composite measures for thousands grains weight found NPi(1) for T3,T4,T7 while as per NPi(2) for T4,T3,T7, NPi(3) T4,T3,T2, NPi (4) found T4, T5, T7 as suitable treatment combinations. Multivariate hierarchical clustering as per Ward’s method for wheat yield observed first irrigation level with three potassium levels formed a cluster and other irrigation levels with potassium application remained in other one. At the first node of demarcation for thousands grains weight IPC5 exhibited MASV with MASV1, ASV1, IPC4, ASV, Si1 Si2 Si3 Si4 Si5 Si6 Si7 NPi(1), CV in one side and mean, GAI, PRVG, IPC1, HM, IPC1, NPi(2) NPi(3) NPi (4) on other side. The performance of treatments based on AMMI and non-parametric measures would be more meaningful for identification of suitable irrigation and potassium levels for wheat sustainable production.
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Naghma, Rahla y Bobby Antony. "Electron impact ionization cross-section of C2, C3, Si2, Si3, SiC, SiC2and Si2C". Molecular Physics 111, n.º 2 (11 de septiembre de 2012): 269–75. http://dx.doi.org/10.1080/00268976.2012.718807.

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Verma, Ajay, B. S. Tyagi y Gyanendra Singh. "Analysis of the Phenotypic Adaptability and Stability of Wheat Genotypes through the Biplot Approach". International Journal of Bio-resource and Stress Management 15, Mar, 3 (26 de marzo de 2024): 01–09. http://dx.doi.org/10.23910/1.2024.5042.

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The present study was conducted during the cropping season during October to April in the year 2022–23. Highly significant effects of environments, genotypes×environments interactions and genotypes had been observed as per the AMMI analysis of twelve wheat genotypes evaluated under advanced varietal trials at eleven major locations and Environments effects had augmented about 49% of the total sum of squares. ASV measure had utilized the 51.7% of the interaction effects had pointed for DBW296, HI1654, PBW899 while MASV measure had exploited nearly 98% of total interaction effects had selected the DBW296, WH1311, UP3111 genotypes as Superiority index measure also the suitability of same genotypes. The simultaneous selection index based on yield and ASV had pointed towards the HI1653, HI1654, HD3369 and genotypes HI1653, DBW397, WH1311 were identified by ssi MASV and genotypes HI1654, HD3369, HI1653 genotypes settled by ssi WAASB measure. Non parametric Si1 had pointed for DBW296, HD3369, NIAW3170 and the values of Si2 and Si3 had pointed towards DBW296, WH1311, HD3369. Composite non parametric measures First measure NPi(1) had favoured the DBW296, HI1653, HD3369 while as per NPi(2) values the DBW296, NIAW3170, PBW899 would be suitable genotypes. Out of the five clusters in the biplot analysis the ASV & WAASB had clustered with NPi(1), Si2, Si3, Si4, Si5, Si6, Si7 non parametric measures as placed in the first quadrant.
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Umeda, T., Nguyen Tien Son, Junichi Isoya, Norio Morishita, Takeshi Ohshima, Hisayoshi Itoh y Erik Janzén. "Electron Paramagnetic Resonance Study of the HEI4/SI5 Center in 4H-SiC". Materials Science Forum 527-529 (octubre de 2006): 543–46. http://dx.doi.org/10.4028/www.scientific.net/msf.527-529.543.

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We present new electron-paramagnetic-resonance (EPR) data on the HEI4/SI5 center in 4H-SiC. So far, the SI5 (SI-5) center has been observed only in as-grown SiC substrates; however, we found that it can be created by electron irradiation to commercial n-type 4H-SiC. The artificially created SI5 center, which we had preliminary called HEI4, was found to be identical with the SI5 center in as-grown SiC. A high-intensity HEI4/SI5 spectrum of irradiated SiC revealed clear hyperfine structures of 29Si and 13C, which enabled us to identify the origin of this center as a carbon antisite-vacancy pair in the negative charge state (CSi-VC –). We assessed its electronic levels using photo-EPR.
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Yu, Hyun-Woo, Kati Raju, Ji Yeon Park y Dang-Hyok Yoon. "Effects of Al2O3-RE2O3Additive for the Sintering of SiC and the Fabrication of SiCf/SiC Composites". Journal of the Korean Ceramic Society 50, n.º 6 (30 de noviembre de 2013): 364–71. http://dx.doi.org/10.4191/kcers.2013.50.6.364.

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Wu, Suhui, Lijian Shi, Bin Zou, Tao Zeng, Zhaoqing Dong y Dunwang Lu. "Daily Sea Ice Concentration Product over Polar Regions Based on Brightness Temperature Data from the HY-2B SMR Sensor". Remote Sensing 15, n.º 6 (21 de marzo de 2023): 1692. http://dx.doi.org/10.3390/rs15061692.

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Polar sea ice profoundly affects atmospheric and oceanic circulation and plays a significant role in climate change. Sea ice concentration (SIC) is a key geophysical parameter used to quantify these changes. In this study, we determined SIC products for the Arctic and Antarctic from 2019 to 2021 using data from the Chinese marine satellite Haiyang 2B (HY-2B) with an improved bootstrap algorithm. Then the results were compared with similar operational SIC products and ship-based data. Our findings demonstrate the effectiveness of the improved algorithm for accurately determining SIC in polar regions. Additionally, the results of the study demonstrate that the SIC product obtained through the improved bootstrap algorithm has a high correlation with other similar SIC products. The daily average SIC of the different products showed similar inter-annual trends for both the Arctic and Antarctic regions. Comparison of the different SIC products showed that the Arctic BT-SMR SIC was slightly lower than the BT-SSMIS and BT-AMSR2 SIC products, while the difference between Antarctic SIC products was more pronounced. The lowest MAE was between the BT-SSMIS SIC and BT-SMR SIC in both regions, while the largest MAE was between the NT-SMR and BT-SMR in the Arctic, and between the NT-SSMIS and BT-SMR in the Antarctic. The SIE and SIA time series showed consistent trends, with a greater difference in SIA than SIC and a slight difference in SIA between the BT-AMSR2 and BT-SMR in the Arctic. Evaluation of the different SIC products using ship-based observation data showed a high correlation between the BT-SMR SIC and the ship-based SIC of approximately 0.85 in the Arctic and 0.88 in the Antarctic. The time series of dynamic tie-points better reflected the seasonal variation in sea ice radiation characteristics. This study lays the foundation for the release of long-term SIC product series from the Chinese autonomous HY-2B satellite, which will ensure the continuity of polar sea ice records over the past 40 years despite potential interruptions.
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Tesis sobre el tema "SiC"

1

Russell, Laura M. "Thermal conductivity/diffusivity of SiC-Mullite and SiC-SiC composites". Thesis, Virginia Tech, 1987. http://hdl.handle.net/10919/40981.

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The purposes of this study were to determine as a function of temperature the thermal diffusivity and/or thermal conductivity of SiC-Mullite and SiC-SiC, and to explain the observed behavior in terms of changes in temperature, microstructure, composition, and/or orientation.

Materials used in the SiC-Mullite study consisted of single crystal SiC whiskers (prepared from rice hulls or by the vapor-liquid-solid process) dispersed within a polycrystalline mullite matrix. During measurement of thermal diffusivity, the samples were heated to l500°C and cooled back to room temperature. No hysteresis occurred. However, both thermal diffusivity and conductivity exhibited maximum values at room temperatures, perpendicular to the hot pressing direction, at high volume percentages of SiC whiskers, and when VLS whiskers were employed.

The SiC-SiC samples consisted of a crossweave of polycrystalline SiC uÌ bers that were coated with phenolic resin and surrounded by a chemically-vapordeposited matrix of SiC. The two types of samples examined were prepared with different amounts of resin. The matrices of the high resin samples were found to be dominated by the presence of char. Samples were cycled to 1000, 1400, and l800°C; hysteresis occurred on some of the cycles. Thermal diffusivity was highest parallel to one set of fibers.

These results allow the qualitative tailoring of the heat flow properties of these ceramic composites, for particular applications, and set forth limitations on the use of the SiC-SiC composites at high temperatures.


Master of Science
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Josiek, Andrei. "CVD dans le système CH₃SiCl₃/H₂ : cinétiques expérimentales de dépôt de SiC et SiC+Si, modélisation". Bordeaux 1, 1995. http://www.theses.fr/1995BOR10613.

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LE DEPOT CHIMIQUE EN PHASE VAPEUR (CVD) DE CERAMIQUES A BASE DE CARBURE DE SILICIUM (SIC) A PARTIR DU MELANGE CH₃SiCl₃/H₂ A ETE ETUDIE POUR DES PRESSIONS TOTALES ET DES TEMPERATURES RELATIVEMENT BASSES (P0 KPA, T75C). L'INFLUENCE DU TEMPS DE SEJOUR DES GAZ DANS LA ZONE CHAUDE DU REACTEUR SUR LA VITESSE DE DEPOT DE SIC A ETE EXAMINEE. UNE TRANSITION ABRUPTE ENTRE DEUX CINETIQUES DE DEPOT DIFFERENTES (CORRESPONDANT AU DEPOT DE SIC OU DE SIC+SI), INDUITE PAR VARIATION D'UN PARAMETRE EXPERIMENTAL, A ETE DETECTEE. LA LOCALISATION DE L'EXCES DE SI DANS LE DEPOT A ETE ETUDIEE AU PLAN THEORIQUE ET EXPERIMENTAL
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Colombo, Sandro de Miranda. "Glifosato e ácido aminometilfosfônico: desenvolvimento de metodologias de análise por injeção sequencial e investigação sobre processos adsortivos e fisiológicos de interesse ambiental". Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/46/46136/tde-31012012-151946/.

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Descreve-se o desenvolvimento de um método de análise por injeção sequencial para determinação de glifosato em formulações comerciais por voltametria de onda quadrada em eletrodo de gota de mercúrio. O glifosato foi derivatizado em modo estacionário com ácido nitroso para produção de N-nitroso glifosato, que é eletroativo. Os limites de detecção (LD) e quantificação (LQ) foram 0,7 e 2,4 mg L-1 (4 e 14 µmol L-1), respectivamente. O método foi aplicado a três formulações, obtendo resultados que diferiram do valor indicado pelo fabricante por -2,6, -0,8 e -28%. Em seguida descreve-se o desenvolvimento de um método de injeção seqüencial para a determinação fluorimétrica de glifosato, Esse método baseou-se em uma primeira etapa de conversão de glifosato a glicina por reação com hipoclorito de calcio, seguida por reação com o-ftaldialdeído na presença de 2-mercaptoetanol (OPA-MCE) em tampão borato (pH> 9) para produzir o composto fluorescente (2\'-hidroxietiltio)-2-N-alkilisoindol (excitação em 340 nm e emissão em 450 nm). O método apresentou resposta linear para concentrações entre 0,25 e 25,0 µmol L-1, com LD e LQ de 0,08 e 0,25 µmol L-1 (14 e 42 µg L-1), respectivamente, e frequência de amostragem de 18 análises por hora. O método foi aplicado para estudar as propriedades de adsorção / dessorção em um solo e em uma amostra de sedimento. Os dados das isotermas de adsorção e dessorção foram tratados pelas equações de Freundlich e Langmuir, que permitiram estimar uma capacidade de adsorção de 1384 ± 26 e 295 ± 30 mg kg-1 para as amostras de solo e sedimento, respectivamente. A determinação de glifosato e AMPA em amostras de água foi realizada por cromatografia por injeção sequencial com detecção fluorimétrica explorando as mesmas reações com hipoclorito e OPA-MCE. A solução transportadora com papel de fase móvel foi composta por mistura metanol: tampão fosfato 10 mmol L-1 (pH 6,8) na proporção 25:75 (v v-1). A frequência de amostragem foi de 6 análises por hora, com LD e LQ de 0,14 e 0,42 µmol L-1 para AMPA e 0,11 e 0,33 µmol L-1 para glifosato, respectivamente. Testes de adição e recuperação em amostras de águas naturais enriquecidas com 0,50 µmol L-1 desses compostos levaram a taxas de recuperação de 82 a 140% para AMPA e de 84 a 96% para glifosato. Investigou-se o efeito do herbicida em cultivos de duas espécies de microalgas marinhas - a Chlorophyta, Tetraselmis gracilis e a diatomácea, Phaeodactilum tricornutum. Para isso adicionou-se diferentes concentrações de glifosato (2 a 1000 mg L-1) a cultivos crescendo em fase exponencial. Doses de 2 e 50 mg L-1 provocaram leve aumento de crescimento algal quando comparados com o cultivo controle sem glifosato. O rendimento quântico da fotossíntese aumentou levemente em alguns dias no cultivo de P. tricornutum em concentrações baixas de glifosato. Na concentração de glifosato de 200 mg L-1 houve declínio do crescimento e acentuada queda do rendimento quântico da fluorescência da fotossíntese. Perfis dos aminoácidos aromáticos, tirosina, triptofano e fenilalanina apresentaram diferenças nas algas.
We describe a development of a voltammetric method for determination of glyphosate in commercial formulations using sequential injection analysis to carry the sample to a flow cell adapted to the capillary of a mercury drop electrode. Glyphosate is batch-derivatized with nitrous acid in hydrochloric acid to produce N-nitroso glyphosate, which is electroactive. The limits of detection (LOD) and quantification (LOQ) were 0.7 and 2.4 mg L-1, respectively. The method was applied to three formulations, obtaining results that differed from the value indicated by the manufacturer by -2.6, -0.8 and -28%. Next, the thesis describes the development of a sequential injection method to automate the fluorimetric determination of glyphosate based on a first step of oxidation to glycine by hypochlorite, followed by reaction with o-phthaldialdehyde in presence of 2-mercaptoethanol (OPA-MCE) in borate buffer (pH>9) to produce a fluorescent 1-(2´-hydroxyethylthio)-2-N-alkylisoindole. The proposed method exhibited a linear response for glyphosate concentrations between 0.25 and 25.0 µmol L-1, with LOD and LOQ of 0.08 and 0.25 µmol L-1, respectively. The sampling rate of the method was 18 samples per hour. The method was applied to study adsorption/desorption properties in a soil and in a sediment sample. Adsorption and desorption isotherms were properly fitted by Freundlich and Langmuir equations, leading to adsorption capacities of 1384 ± 26 and 295 ± 30 mg kg-1 for the soil and sediment samples, respectively. Determination of glyphosate and AMPA in water samples was performed by sequential injection chromatography (SIC) with fluorimetric detection by exploiting the same reactions with hypochlorite and OPA-MCE. The carrier solution plays a role of mobile phase, being composed of 25:75 (v v-1) methanol : 10 mmol L-1 phosphate buffer (pH 6.8). The chromatographic step enhanced the method selectivity. The sampling throughput was 6 analyzes per hour with LOD and LOQ of 0.14 and 0.42 µmol L-1 for AMPA and 0.11 and 0.33 µmol L-1 for glyphosate, respectively. Recovery tests in natural water samples enriched with 0.50 µmol L-1 in the compounds led to recovery rates from 82 to 140% for AMPA and 84 to 96% for glyphosate. We investigated the effect of the herbicide on cultivation of two species of marine microalgae - the Chlorophyta, Tetraselmis gracilis and the diatomaceous Phaeodactilum tricornutum. To achieve this goal, different concentrations of glyphosate (2 to 1000 mg L-1) were added to cultures growing in exponential phase. Doses between 2 and 50 mg L-1 caused a slight increase in algal growth compared to the control culture without glyphosate. The quantum yield of photosynthesis increased slightly in some days in the cultivation of P. tricornutum at low concentrations of glyphosate. The glyphosate concentration of 200 mg L-1 decreases the cell growth and caused a marked decline in the fluorescence quantum yield of photosynthesis. Profiles of aromatic amino acids, tyrosine, tryptophan and phenylalanine differed in the algae
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Bertrand, Sébastien. "Amélioration de la durée de vie de composites SiC/Sic à interphases nanoséquencées (PyC/SiC)n et (BN/SiC)n". Bordeaux 1, 1998. http://www.theses.fr/1998BOR10607.

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Des minicomposites et des composites 2d tisses sic/sic avec des interphases multicouches nanosequencees pyrocarbone / carbure de silicium (pyc/sic)#n ou nitrure de bore / carbure de silicium (bn/sic)#n ont ete elabores par infiltration chimique en phase vapeur pulsee (p-cvi). Ces materiaux presentent une resistance a l'oxydation, sous charge en temperature, bien superieure a celle que confere une interphase monocouche de pyc ou de bn ; tout en ayant des caracteristiques mecaniques a l'ambiante comparables. Des traitements specifiques de la fibre hi-nicalon ont egalement permis d'augmenter (i) la thermostabilite de la fibre, (ii) sa resistance a la fissuration sous-critique, (iii) l'intensite de la liaison fibre / matrice des composites et (iv) la resistance a l'oxydation, sous charge, des fibres et des composites.
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SUH, Min-Soo. "Wear Mechanisms on SiC and SiC/SiC Composites under Sliding Friction and Erosive Wear". Kyoto University, 2010. http://hdl.handle.net/2433/126768.

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Bergerat, Jean-Michel. "Etude du comportement à la rupture de composites ALO/ALO.AlO/SiC et SiC/SiC". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376118559.

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Woods, Christopher Huia. "Masqueulinities [sic] an [sic] MA thesis by practice /". Click here to access this resource online, 2007. http://repositoryaut.lconz.ac.nz/theses/1368/.

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Vine, Wendy Jane. "Electron microscopy of SiC and SiC related composites". Thesis, University of Bristol, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333867.

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Carrere, Philippe. "Comportement thermomécanique d'un composite de type SiC/SiC". Bordeaux 1, 1996. http://www.theses.fr/1996BOR10703.

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Dans les composites sic/pyc/sic, initialement developpes pour des applications structurales a hautes temperatures, l'interface de pyrocarbone est sensible a l'oxydation. L'addition de bore dans la matrice favorise la formation d'un verre qui permet la cicatrisation des fissures. Le comportement thermomecanique de ce materiau sic/sibc a donc ete etudie a des temperatures comprises entre 700c et 1200c, sous atmosphere inerte ou oxydante en traction uniaxiale, en fatigue statique ou cyclique. Ce travail a permis de determiner la contribution des contraintes residuelles sur la fissuration matricielle, l'influence de l'etat d'endommagement initial de la matrice sur la vitesse de fluage et enfin les mecanismes de comportement et de rupture a chaud sous air qui dependent de la vitesse de mise en place de la protection vitreuse et de son etancheite
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ABBE, FRANCOIS. "Fluage en flexion d'un composite sic-sic 2d". Caen, 1990. http://www.theses.fr/1990CAEN2029.

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Un composite bidirectionnel a matrice de carbure de silicium renforcee par des fibres longues de carbure de silicium a fait l'objet d'une etude de comportement et resistance en fluage dans le domaine de temperature 1273 k-1773 k par des essais en flexion 3 points sous vide. Un marquage lithographique de la surface d'eprouvette, supportant des hautes temperatures, a permis de developper une methodologie de deconvolution de l'essai de flexion donnant acces aux lois de comportement en traction et en compression dans le domaine stationnaire. Une modelisation du stade transitoire a ete effectuee conduisant a la validation de l'approche menee. La description de l'evolution de l'endommagement au cours du fluage semble pouvoir etre decrite par les concepts de la mecanique des milieux continus endommages. Le lien avec l'approche precedente consiste a introduire la valeur non nulle de la zone endommagee au stade stationnaire obtenue lors de l'utilisation de la methode de deconvolution. Le seuil de contrainte, a partir duquel cette zone endommagee apparait, est directement correle aux mesures par micro-indentation du cisaillement interfacial fibre/matrice que nous avons effectuees. Les valeurs des parametres morphologiques fondamentaux necessaires aux differentes approches ont ete obtenues a l'aide des techniques d'analyse d'images. La microscopie electronique a trans-mission nous a apporte les complements d'informations dont nous avions besoin pour justifier l'interpretation du comportement mecanique observe experimentalement. Le role fondamental de l'interface et des proprietes thermomecaniques de la fibre dans un environnement particulier (vide) ont ete clairement mis en evidence
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Libros sobre el tema "SiC"

1

Landers, Sean. [Sic] =: Sic. New York: Riverhead Books, 1995.

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Islam, Fatima S. Canned and frozen foods industry (SIC 2032, SIC 2033, SIC 2034, SIC 2035, SIC 2037, and SIC 2038). Oklahoma City, Okla: Oklahoma Dept. of Commerce, Research and Planning Division, 1990.

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Cook, Janae Dalene. Scandinvaian [sic] ancestory [sic]. Palos Verdes Estates, Calif: Cobblestone Enterprises, 1996.

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[Sic]. New York: Riverhead Books, 1995.

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Landers, Sean. [Sic]. New York: Publicsfear Press, 1993.

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Gibson, Melissa James. [Sic]. New York: Dramatists Play Service, 2004.

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[Sic]. New York: W.W. Norton, 2011.

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Sic. Firenze: Vallecchi, 1985.

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Freitas, Manuel de. [Sic]. Lisboa: Assírio & Alvim, 2002.

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sauteruisseau, Gentil, ed. Le Genti porteu [sic] d'fantasque: A ces messieur [sic] les acheteux et a ces dame [sic] les acheteuse [sic] de c'te Gazette qu'est pour tou [sic] l'mond' [sic] sam [sic] distinxion [sic] d'cesque [sic]. [S.l: s.n., 1986.

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Capítulos de libros sobre el tema "SiC"

1

Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "SiC". En Landolt-Börnstein - Group III Condensed Matter, 711. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_597.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "SiC". En Landolt-Börnstein - Group III Condensed Matter, 728. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_614.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "SiC". En Landolt-Börnstein - Group III Condensed Matter, 737–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_623.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "SiC". En Landolt-Börnstein - Group III Condensed Matter, 745. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_628.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "SiC". En Landolt-Börnstein - Group III Condensed Matter, 770. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_653.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "SiC". En Landolt-Börnstein - Group III Condensed Matter, 787. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_670.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "SiC". En Landolt-Börnstein - Group III Condensed Matter, 830–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_695.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, N. Melnichenko-Koblyuk et al. "SiC". En Landolt-Börnstein - Group III Condensed Matter, 832–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-44752-8_696.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, O. Pavlyuk, I. Savysyuk y S. Stoyko. "SiC". En Structure Types. Part 7: Space Groups (160) R3m - (156) P3m1, 257–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-69949-1_113.

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Villars, P., K. Cenzual, J. Daams, R. Gladyshevskii, O. Shcherban, V. Dubenskyy, V. Kuprysyuk, O. Pavlyuk, I. Savysyuk y S. Stoyko. "SiC". En Structure Types. Part 7: Space Groups (160) R3m - (156) P3m1, 299–301. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-69949-1_130.

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Actas de conferencias sobre el tema "SiC"

1

Boyle, Robert J. "Reducing Fuel Burn Using SiC/SiC CMC HPT Vanes and Rotor Blades". En ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82669.

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Abstract Issues with using High Pressure Turbine SiC/SiC CMC vanes and rotor blades for future commercial aircraft engines to reduce fuel burn, and CO2 emissions are explored. The higher temperature capability of SiC/SiC CMC vanes and rotor blades enables higher values of T40 and OPR, which leads to smaller engine cores and lower SFC. Decreasing engine weight, especially for long range flights, can be as significant as decreasing cruise SFC in terms of reduced fuel burn. Specific work increases as T40 increases, and. engine core weight decreases. The work focuses on the first stage vane, and shows that film cooled SiC/SiC vanes are highly desirable. Otherwise, excessive vane thermal stresses are likely. Increases in T40 have accompanied increases in engine OPRs. This leads to small spans in the high pressure components. The effect of decreased spans on blade row efficiency is examined. Cycle analyses are presented which show the effects of changes in blade row efficiency on SFC and specific work.
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Lan, Weiping, Dachao Lin, Zulong Hao y Fenglei Niu. "Stress Analysis of Three-Layer SiC Cladding for PWRs". En 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66814.

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Silicon carbide (SiC) and SiC matrix composites (SiCf/SiC) are being investigated as potential fuel cladding materials for advanced PWRs in order to improve the safety of nuclear power plants. The conceptual design of multi-layered SiC cladding (consisting of a monolithic SiC layer, SiCf/SiC composite layer and a monolithic SiC coating layer) has been investigated to meet the fuel requirements of both the strength and impermeability. A stress distribution model of the triple-layered SiC is developed on the basis of the theory of thermo-elasticity mechanics, taking radial temperature gradient and swelling effects into account as well. The heat transferring behavior of the cladding is investigated by analyzing the temperature distribution under steady conditions. Finite Element Analysis (FEA) code ANSYS is used to obtain the stress and temperature nephogram of multi-layered SiC fuel cladding under simulated steady conditions. Compared with the results of ANSYS, the stress distribution model and temperature distribution is validated.
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Nishio, Kozi, Ken-ichiroh Igashira, Koji Take y Takeshi Suemitsu. "Development of a Combustor Liner Composed of Ceramic Matrix Composite (CMC)". En ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-104.

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The Research Institute of Advanced Materials Gas-Generator (AMG), which is a joint effort by the Japan Key Technology Center and 14 firms in Japan, has, since fiscal year 1992, been conducting technological studies on an innovative gas generator that will use 20% less fuel, weigh 50% less, and emit 70% less NOx than the conventional gas generator through the use of advanced materials. Within this project, there is an R&D program for applying ceramic matrix composite (CMC) liners to the combustor, which is a major component of the gas generator. In the course of R&D, continuous SiC fiber-reinforced SiC composite (SiCF/SiC) was selected as the most suitable CMC for the combustor liner because of its thermal stability and formability. An evaluation of the applicability of the SiCF/SiC composite to the combustor liner on the basis of an evaluation of its mechanical properties and stress analysis of a SiCF/SiC combustor liner was carried out, and trial SiCF/SiC combustor liners, the largest of which was 500mm in diameter, were fabricated by the filament winding and PIP (polymer impregnation and pyrolysis) method. Using a SiCF/SiC liner built to the actual dimensions, a non-cooling combustion test was carried out and even when the gas temperature was raised to 1873K at outlet of the liner, no damage was observed after the test. Through our studies we have confirmed the applicability of the selected SiCF/SiC composite as a combustor liner. In this paper, we describe the present state of the R&D of a CMC combustor liner.
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Huang, C. Z., H. L. Liu, J. Wang y Z. W. Liu. "Study on Mechanical Properties of Multi-Scale and Multi-Phase Nanocomposite Ceramic Tool Materials". En ASME 2006 International Manufacturing Science and Engineering Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/msec2006-21054.

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The single nano-scale and multi-phase nanocomposite ceramic materials including Al2O3/Al2O3n/SiCn and Al2O3/Ti(C0.7N0.3)n/SiCn are successfully fabricated. Their mechanical properties are better than those of the single-phase alumina material and conventional alumina matrix materials. The multi-scale and single-phase nanocomposite ceramic tool material Al2O3/SiCμ/SiCn is also successfully fabricated. Its flexural strength and fracture toughness is higher than those of single-scale materials Al2O3/SiCμ and Al2O3/SiCn. The multi-scale and multi-phase nanocomposite ceramic tool material Al2O3/TiCμ/TiNn is finally developed by incorporation and dispersion of micro-scale TiC particle and nano-scale TiN particle in alumina matrix, which can get higher flexural strength and fracture toughness than those of Al2O3/TiC ceramic tool material without nano-scale TiN particle. The coexistent function of nano-scale Al2O3 or Ti(C0.7N0.3), nano-scale SiC and TiN can reduce the sintering temperature and sintering duration time as well as the grain size, and improve the material densification and mechanical properties. The nano-scale SiC grains locating along the grain boundary and inside the micro-scale alumina can form the hybria intergranular-intragranular microstructure which can result in hybria intergranular-transgranular fracture and improve the mechanical properties of the ceramic material. Crack deflection, forking and bridging effects are the main cause for improving the fracture toughness of the materials including Al2O3/Ti(C0.7N0.3)n/SiCn and Al2O3/TiCμ/TiNn.
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Kowbel, Witold, Rigel Woida y J. C. Withers. "SiC-SiC composites for optical applications". En Optics & Photonics 2005. SPIE, 2005. http://dx.doi.org/10.1117/12.617951.

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Haftka, R., H. Nagaraju, J. Nance, B. Sankar y G. Subhash. "Measuring Heterogeneity of SiCf /SiC Tubular Composites". En Tranactions - 2019 Winter Meeting. AMNS, 2019. http://dx.doi.org/10.13182/t30861.

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Xinyuan, Shang, Zhang Shaoyang y Zhang Aimin. "Modeling and Thermal Calculation of Fuel Rod With SiCf/SiC Cladding for LWRs". En 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67078.

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SiC fiber composite material as fuel cladding is proposed to increase the power density and maximum allowable fuel burnup in light water reactors. Empirical models about thermal properties of the SiC material are developed as a function of operating temperature and neutron fluence. A fuel rod modeling code frapcon2-SiC based on frapcon2 is compiled to predict the performance of SiC cladding when operating. Comparison of the behavior between the SiCf/SiC cladding and Zr-4 cladding in different thickness reveals that higher temperature will get due to the poor thermal conductivity of the SiC. As far as the Conclusion shows that Poor thermal performance of SiC cladding makes the design margin becomes smaller.
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Kowbel, Witold y J. C. Withers. "SiC-SiC composites optics for UV applications". En Optical Engineering + Applications, editado por William A. Goodman y Joseph L. Robichaud. SPIE, 2007. http://dx.doi.org/10.1117/12.736725.

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Morscher, Gregory N., John Z. Gyekenyesi y Andrew L. Gyekenyesi. "Mechanical Behavior of Notched SiC/SiC Composites". En ASME Turbo Expo 2001: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/2001-gt-0461.

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Gas turbine components such as combustor liners or turbine vanes are subject to regions of high stress-concentration, e.g. attachment to the frame or at cooling holes. Ceramic matrix composites (CMCs) are potential materials for high temperature applications in gas turbines. They offer some capability to relieve stress at regions of high stress-concentration via matrix damage accumulation. In this study notch sensitivity was examined for woven SiC fiber reinforced, melt-infiltrated SiC matrix composites with a BN interphase, utilizing either Hi-Nicalon™ fibers or the stiffer Sylramic® fibers. The double-edge notched tensile test approach was used for a wide range of notch sizes and specimen widths. Both composite systems exhibited mild notch sensitivity similar to other CMC systems. Acoustic emission, detected during the tensile tests, indicated that matrix cracking occurred around notches at net-section stresses below the stress where matrix cracking first occurs in unnotched specimens. However, thermoelastic stress analysis did not show any measurable stress relief around notches after the specimens were preloaded.
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Ping, Zhu, Wang Li, Ruan Li-gang y Zhang Jian-feng. "Temperature effects on performance of SiC power transistors (SiC JFET and SiC MOSFET)". En 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe). IEEE, 2015. http://dx.doi.org/10.1109/epe.2015.7309249.

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Informes sobre el tema "SiC"

1

Snead, Mary A., Yutai Katoh, Takaaki Koyanagi y Gyanender P. Singh. SiC/SiC Cladding Materials Properties Handbook. Office of Scientific and Technical Information (OSTI), agosto de 2017. http://dx.doi.org/10.2172/1399957.

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Youngblood, G. E., R. H. Jones, Akira Kohyama, Yutai Katoh, Akira Hasegawa, L. Snead y R. Scholz. The HFIR 14J irradiation SiC/SiC composite and SiC fiber collaboration. Office of Scientific and Technical Information (OSTI), septiembre de 1998. http://dx.doi.org/10.2172/330620.

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Lara-Curzio, E. Optimization of Pseudo-Porous SiC Fiber Coatings for SiC/SiC Composites. Office of Scientific and Technical Information (OSTI), enero de 2001. http://dx.doi.org/10.2172/777618.

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Youngblood, G. E. y R. H. Jones. Methods of radiation effects evaluation of SiC/SiC composite and SiC fibers. Office of Scientific and Technical Information (OSTI), marzo de 1998. http://dx.doi.org/10.2172/335383.

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Youngblood, G. E., C. H. Henager y R. H. Jones. Thermochemical instability effects in SiC-based fibers and SiC{sub f}/SiC composites. Office of Scientific and Technical Information (OSTI), agosto de 1997. http://dx.doi.org/10.2172/543691.

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Zinkle, S. J. y L. L. Snead. Thermophysical and mechanical properties of SiC/SiC composites. Office of Scientific and Technical Information (OSTI), septiembre de 1998. http://dx.doi.org/10.2172/330618.

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Stinton, D. P., E. R. Kupp y J. W. Hurley. Oxidation-resistant interface coatings for SiC/SiC composites. Office of Scientific and Technical Information (OSTI), junio de 1996. http://dx.doi.org/10.2172/450753.

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Ghoniem, N. M. Radiation effects and micromechanics of SiC/SiC composites. Office of Scientific and Technical Information (OSTI), enero de 1991. http://dx.doi.org/10.2172/6181622.

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Ghoniem, N. M. Radiation effects and micromechanics of SiC/SiC composites. Office of Scientific and Technical Information (OSTI), enero de 1992. http://dx.doi.org/10.2172/6917051.

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Coon, D. Vitreous joining of SiC fiber reinforced SiC composites. Office of Scientific and Technical Information (OSTI), diciembre de 1989. http://dx.doi.org/10.2172/6973365.

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