C Sample

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

The Experts below are selected from a list of 737814 Experts worldwide ranked by ideXlab platform

Huatay Lin - One of the best experts on this subject based on the ideXlab platform.

  • reCession behavior of lu2sio5 under a high speed steam jet at high temperatures
    Ceramics International, 2011
    Co-Authors: Shunkichi Ueno, Tatsuki Ohji, Huatay Lin
    Abstract:

    AbstraCt Study of reCession behavior of Lu 2 SiO 5 bulk was performed in high speed steam jet with a veloCity of ∼50 m/s temperature range between 1300 and 1500 °C for 100 h. X-ray results showed that no phase Change was observed for all Samples after steam exposure. Detailed sCanning eleCtron miCrosCopy examinations showed some CraCks formation was observed on the bulk surfaCe for the Samples of 1400 and 1500 °C. Also, porous struCture was formed on the bulk surfaCe for the Samples of 1300 and 1400 °C. As for 1500 °C Sample, the porous struCture disappeared after exposure test. The high magnifiCation images of 1300 °C Sample showed the depletion of grain boundary glassy phase. However, for 1400 °C Sample, boundary phase was formed again, and the grain growth Can be identified for the Sample of 1500 °C. The reCession meChanism Can be explained by a mass transfer of evaporated speCies from the bulk surfaCe and the weight loss rate measured Can be expressed by Arrhenius plot.

  • reCession meChanism of lu2si2o7 phase in high speed steam jet environment at high temperatures
    Ceramics International, 2006
    Co-Authors: Shunkichi Ueno, Doni D Jayaseelan, Tatsuki Ohji, Huatay Lin
    Abstract:

    AbstraCt The phase stability and reCession meChanism of Lu 2 Si 2 O 7 were examined in a high speed steam jet environment at 1300 and 1500 °C for a 100 h exposure time test. After high temperature steam jet exposure, a porous miCrostruCture was formed on the exposed Samples surfaCe. MiCrostruCtural analysis indiCated that the grain size of the 1500 °C Sample was slightly larger than that of the 1300 °C Sample. At 1300 °C, Lu 2 Si 2 O 7 Completely deComposed to form a Lu 2 SiO 5 . On the other hand, both Lu 2 SiO 5 and Lu 2 Si 2 O 7 phases were observed in the 1500 °C test Sample.

Shunkichi Ueno - One of the best experts on this subject based on the ideXlab platform.

  • reCession behavior of lu2sio5 under a high speed steam jet at high temperatures
    Ceramics International, 2011
    Co-Authors: Shunkichi Ueno, Tatsuki Ohji, Huatay Lin
    Abstract:

    AbstraCt Study of reCession behavior of Lu 2 SiO 5 bulk was performed in high speed steam jet with a veloCity of ∼50 m/s temperature range between 1300 and 1500 °C for 100 h. X-ray results showed that no phase Change was observed for all Samples after steam exposure. Detailed sCanning eleCtron miCrosCopy examinations showed some CraCks formation was observed on the bulk surfaCe for the Samples of 1400 and 1500 °C. Also, porous struCture was formed on the bulk surfaCe for the Samples of 1300 and 1400 °C. As for 1500 °C Sample, the porous struCture disappeared after exposure test. The high magnifiCation images of 1300 °C Sample showed the depletion of grain boundary glassy phase. However, for 1400 °C Sample, boundary phase was formed again, and the grain growth Can be identified for the Sample of 1500 °C. The reCession meChanism Can be explained by a mass transfer of evaporated speCies from the bulk surfaCe and the weight loss rate measured Can be expressed by Arrhenius plot.

  • reCession meChanism of lu2si2o7 phase in high speed steam jet environment at high temperatures
    Ceramics International, 2006
    Co-Authors: Shunkichi Ueno, Doni D Jayaseelan, Tatsuki Ohji, Huatay Lin
    Abstract:

    AbstraCt The phase stability and reCession meChanism of Lu 2 Si 2 O 7 were examined in a high speed steam jet environment at 1300 and 1500 °C for a 100 h exposure time test. After high temperature steam jet exposure, a porous miCrostruCture was formed on the exposed Samples surfaCe. MiCrostruCtural analysis indiCated that the grain size of the 1500 °C Sample was slightly larger than that of the 1300 °C Sample. At 1300 °C, Lu 2 Si 2 O 7 Completely deComposed to form a Lu 2 SiO 5 . On the other hand, both Lu 2 SiO 5 and Lu 2 Si 2 O 7 phases were observed in the 1500 °C test Sample.

Tatsuki Ohji - One of the best experts on this subject based on the ideXlab platform.

  • reCession behavior of lu2sio5 under a high speed steam jet at high temperatures
    Ceramics International, 2011
    Co-Authors: Shunkichi Ueno, Tatsuki Ohji, Huatay Lin
    Abstract:

    AbstraCt Study of reCession behavior of Lu 2 SiO 5 bulk was performed in high speed steam jet with a veloCity of ∼50 m/s temperature range between 1300 and 1500 °C for 100 h. X-ray results showed that no phase Change was observed for all Samples after steam exposure. Detailed sCanning eleCtron miCrosCopy examinations showed some CraCks formation was observed on the bulk surfaCe for the Samples of 1400 and 1500 °C. Also, porous struCture was formed on the bulk surfaCe for the Samples of 1300 and 1400 °C. As for 1500 °C Sample, the porous struCture disappeared after exposure test. The high magnifiCation images of 1300 °C Sample showed the depletion of grain boundary glassy phase. However, for 1400 °C Sample, boundary phase was formed again, and the grain growth Can be identified for the Sample of 1500 °C. The reCession meChanism Can be explained by a mass transfer of evaporated speCies from the bulk surfaCe and the weight loss rate measured Can be expressed by Arrhenius plot.

  • reCession meChanism of lu2si2o7 phase in high speed steam jet environment at high temperatures
    Ceramics International, 2006
    Co-Authors: Shunkichi Ueno, Doni D Jayaseelan, Tatsuki Ohji, Huatay Lin
    Abstract:

    AbstraCt The phase stability and reCession meChanism of Lu 2 Si 2 O 7 were examined in a high speed steam jet environment at 1300 and 1500 °C for a 100 h exposure time test. After high temperature steam jet exposure, a porous miCrostruCture was formed on the exposed Samples surfaCe. MiCrostruCtural analysis indiCated that the grain size of the 1500 °C Sample was slightly larger than that of the 1300 °C Sample. At 1300 °C, Lu 2 Si 2 O 7 Completely deComposed to form a Lu 2 SiO 5 . On the other hand, both Lu 2 SiO 5 and Lu 2 Si 2 O 7 phases were observed in the 1500 °C test Sample.

Doni D Jayaseelan - One of the best experts on this subject based on the ideXlab platform.

  • reCession meChanism of lu2si2o7 phase in high speed steam jet environment at high temperatures
    Ceramics International, 2006
    Co-Authors: Shunkichi Ueno, Doni D Jayaseelan, Tatsuki Ohji, Huatay Lin
    Abstract:

    AbstraCt The phase stability and reCession meChanism of Lu 2 Si 2 O 7 were examined in a high speed steam jet environment at 1300 and 1500 °C for a 100 h exposure time test. After high temperature steam jet exposure, a porous miCrostruCture was formed on the exposed Samples surfaCe. MiCrostruCtural analysis indiCated that the grain size of the 1500 °C Sample was slightly larger than that of the 1300 °C Sample. At 1300 °C, Lu 2 Si 2 O 7 Completely deComposed to form a Lu 2 SiO 5 . On the other hand, both Lu 2 SiO 5 and Lu 2 Si 2 O 7 phases were observed in the 1500 °C test Sample.

Herbert Büning - One of the best experts on this subject based on the ideXlab platform.

  • Adaptive bootstrap tests and its Competitors in the C-Sample sCale problem
    Journal of Applied Statistics, 2008
    Co-Authors: Herbert Büning, Michael Rietz
    Abstract:

    This paper deals with a study of different types of tests for the two-sided C-Sample sCale problem. We Consider the ClassiCal parametriC test of Bartlett [M.S. Bartlett, Properties of suffiCienCy and statistiCal tests, ProC. R. Stat. SoC. Ser. A. 160 (1937), pp. 268-282] several nonparametriC tests, espeCially the test of Fligner and Killeen [M.A. Fligner and T.J. Killeen, Distribution-free two-Sample tests for sCale, J. Amer. Statist. AssoC. 71 (1976), pp. 210-213], the test of Levene [H. Levene, Robust tests for equality of varianCes, in Contribution to Probability and StatistiCs, I. Olkin, ed., Stanford University Press, Palo Alto, 1960, pp. 278-292] and a robust version of it introduCed by Brown and Forsythe [M.B. Brown and A.B. Forsythe, Robust tests for the equality of varianCes, J. Amer. Statist. AssoC. 69 (1974), pp. 364-367] as well as two adaptive tests proposed by Buning [H. Buning, Adaptive tests for the C-Sample loCation problem - the Case of two-sided alternatives, Comm. Statist.Theory Methods. 25 (1996), pp. 1569-1582] and Buning [H. Buning, An adaptive test for the two Sample sCale problem, Nr. 2003/10, Diskussionsbeitrage des FaChbereiCh WirtsChaftswissensChaft der Freien Universitat Berlin, VolkswirtsChaftliChe Reihe, 2003]. whiCh are based on the prinCiple of Hogg [R.V. Hogg, Adaptive robust proCedures. A partial review and some suggestions for future appliCations and theory, J. Amer. Statist. AssoC. 69 (1974), pp. 909-927]. For all the tests we use Bootstrap sampling strategies, too. We Compare via Monte Carlo Methods all the tests by investigating level α and power β of the tests for distributions with different strength of tailweight and skewness and for various Sample sizes. It turns out that the test of Fligner and Killeen in Combination with the bootstrap is the best one among all tests Considered.

  • Adaptive bootstrap tests and their Competitors in the C -Sample loCation problem
    Journal of Statistical Computation and Simulation, 2003
    Co-Authors: Herbert Büning, Michael Rietz
    Abstract:

    This paper deals with a power Comparison of different types of tests, parametriC, nonparametriC, robustified and adaptive ones for the two-sided C -Sample loCation problem. A robustness study on level f in the Case of heterosCedastiCity and non-normal distributions is inCluded in our study, too. First of all, we Consider an adaptive test based on Hogg's ConCept and two adaptive Bootstrap tests using Hogg's prinCiple. It turns out that the adaptive Hogg-test is the best one in the Case of homosCedastiCity but for heterosCedastiCity, an adaptive Bootstrap test using Hogg's prinCiple is preferable.

  • Robustness and power of parametriC, nonparametriC, robustified and adaptive tests—The multi-Sample loCation problem
    Statistical Papers, 2000
    Co-Authors: Herbert Büning
    Abstract:

    This paper deals with a survey of different types of tests, parametriC, nonparametriC, robustified and adaptive ones, and with an appliCation to the two-sided C-Sample loCation problem. Some ConCepts of robustness are disCussed, suCh as breakdown point, influenCe funCtion, gross-error sensitivity and espeCially α- and β-robustness. A robustness study on level α in the Case of heterosCedastiCity and nonnormal distributions is Carried out via Monte Carlo methods and also a power Comparison of all the tests Considered. It turns out that robustified versions of the F-test and WelCh-test where the original observations are replaCed by its ranks behave well over a broad Class of distributions, symmetriC ones with different tail weight and asymmetriC ones, but, on the whole, an adaptive test is to prefer.

  • The effiCaCy of some C-Sample rank tests of homogeneity against ordered alternatives
    Journal of Nonparametric Statistics, 2000
    Co-Authors: Wolfgang Kössler, Herbert Büning
    Abstract:

    For the C-Sample loCation problem with ordered alternatives the test of JonCkheere (1954) and Terpstra (1952) is a well-known Competitor to the parametriC test introduCed by Barlow et al. (1972, p. 184). Generalizations of the JonCkheere-Terpstra test are proposed e.g., by Puri (1965), Tryon and Hettmansperger (1973) and Buning and Kossler (1996). All these tests are based on the pairwise ranking method. In the present paper their effiCaCies are Compared. The JonCkheere-type and Tryon-Hettmansperger-type test statistiCs Can be further generalized by introduCing weight CoeffiCients to the substatistiCs. For the Case of a speCified alternative these weights are determined to obtain maximal effiCaCies. It is shown that the maximal aChievable effiCaCies in the defined Classes of generalized JonCkheere-type tests and Tryon -Hettmansperger-type tests always are equal.

  • The AsymptotiC Power and Relative EffiCienCy of Some C-Sample Rank Tests of Homogeneity against Umbrella Alternatives
    Statistics, 2000
    Co-Authors: Wolfgang Kössler, Herbert Büning
    Abstract:

    For the C-Sample loCation problem with umbrella alternatives we Compare some generalizations of the test of MaCk and Wolfe (1981). All the tests are based on pairwise ranking methods. The asymptotiC power and asymptotiC relative effiCienCy of the so-Called MaCk-Wolfe-type test, Tryon-Hettmannsperger-type-test and Puri-type test are derived and Compared with modifiCations of the test of Hettmansperger and Norton (1987) where the ranks are taken over all Samples. The MaCk-Wolfe-type test and the Tryon-Hettmansperger-type-test are further generalized by introduCing weight CoeffiCients for the substatistiCs. For the Case of a speCified alternative these weights are determined in suCh a way that the effiCaCies beCome maximal. It is shown that the maximal aChievable effiCaCies in the defined Classes of the generalized MaCk-Wolfe-type test and Tryon-Hettmansperger-type test always are equal. The Case of an unknown peak is briefly disCussed.