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1. Comparative study of the crystallization behavior within the Na 2 O–Y 2 O 3 –ZrO 2 –SiO 2 system... 2022

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwjV1LSwMxEA7iSQ--wTcBew1189htoBSkDwTBCvail5LX2kJppejBm_9B8Af6S5zJdu32oHhKlskmy06YmWTyfSGkZmHtrzNhmfLCM-l5xqwyGdOZz0UwVpvMrm7mkNovGXyh6x3e7qJnzjpoaMFhYUY2vflJFcikoByQKTLrClFykK68WvE6FffR2yZ3JQgnnhrBuwqqx-frkbIw8lRU6Bn__MgdsrUIJelVoftdshame2SzQjC4Tz7bS3Jv2hy1Iplssz5q0VlOIfSjbv4G4eFkskBj0hK1T3F_djyNbW4N5bT_9f7xgCUVFKrQ1-O8H3vi-Hw_7kMFR4jM0FFQICApWnsszdRTN8M7gp4OyKDXHbSv2eImBuaytMPSHBG0nNs0N94FLYVTjYZwhgeI_3RQ1gSprfHGWgXi3GlppeRJbqVJQhCHhEKk6MG4cm8UCD03MDlUYmFB5blwlh-Ri1JDw-eCaGMYE-RCD5d_9_hfrU7IBkeUwmUKRuCUrL_MX8MZWUetnsfJ8w2SgcDo

   Thieme, Christian; Dittmer, Marc; Höche, Thomas; Rampf, Markus...

   Cryst Eng Comm, Vol. 24, Issue 24, pp. 4391 - 4398.

   Phase formation in glasses from the system Na 2 O–Y 2 O 3 –SiO 2 with different concentrations of ZrO 2 were studied concerning phase formation and crystallization behavior. The compositions were n... Read more

   Phase formation in glasses from the system Na 2 O–Y 2 O 3 –SiO 2 with different concentrations of ZrO 2 were studied concerning phase formation and crystallization behavior. The compositions were near the stoichiometry of NaYSi 2 O 6 . A comparison of microstructure and phase content after instant crystallization during slow cooling and after subsequent thermal annealing is given. The phases as well as the microstructure differ depending on thermal history. During cooling, predominantly a phase with apatite structure (NaY 9 Si 6 O 26 ) precipitates and the residual glassy phase is enriched in ZrO 2 . The composition of the glassy phase was quantified and an enrichment of ZrO 2 of slightly above five mol% was measured. ZrO 2 concentrations >5 mol% lead to the precipitation of Y 2 O 3 enriched ZrO 2 . A fast cooling of the melt results in glass formation without instant crystallization. Subsequent heating at temperatures below 1000 °C leads to the precipitation of an unknown phase whereas at higher temperatures NaYSi 2 O 6 crystallizes. Two-step heating in terms of nucleation and crystal growth were performed and small ZrO 2 -particles have been formed homogenously within the sample volume. Those particles do not trigger volume crystallization within the glasses and surface crystallization is the predominant crystallization mechanism. Read less

   Journal Article  |  Full Text Online

2. Mixed-metal amorphous and spinel phase oxidation catalysts: characterization by x-ray... 1992

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwhV3fa9swEBZr-7Duodu6wtKuQw9lTxGJbamqSymUsG6MDTqWwd7M6YeXsjoxVgrJn9v_ZCfJMUkZ3ZONkGXZPvu-s767j5AThbF_LjPFhMkM4yaVTAmQLJemzCyoHKTa_JnTkWger-CnyUBXoSgLoDPZIjspBlWeuXU1-tItFngfGcBiLhmX4rRNw3t0sHc_2m24nx1_JxeeDgkO70gZpSwiETL4l-uX5PsqSyfQSryYwTq_fhBqGoZCFmv1G5--ildkrwWb9Cpax2vyzE73yfPRSuNtn7xYK0f4hjx8u11YwyqLgJxCNcNHMLt3FKaGuhq73dF6gk6Pzha3UYmJhp8_Szd351R3lZ9jYidVS7pgDSyp12BpYv5Ev20C5XD02LIS4qGV5wb6LJllP5wzDo5TpxeTSxf5jheDySWdlaEl1loPLZ5wH6UucLeubdPHrYK7eRypgulv8FKbB-Tn9cfx6DNrJSAYZILPmeD2NEcQAcC5TowWQilheZloSKwZ2qFF-HomQQ59Rm2uEP6qEhGdlVxLjfH3W0IRoxr8rKcGRM6VSQHNUiQKQzmTZlqlPULRMIr23XVFWJZPk2LtkfXIycpqijpWAfl3tw_Boro-0PzxxDkpivHNj2KM4ePw06-b4muPHG-YXHeAXwZHgHD4_ykdkd3IHPZ0t3dke97c22Oy7Q3zfXg9_gIhCw3a

   Wright, Paul A; Natarajan, Srinivasan; Thomas, John M; Gai-Boyes, Pratibha L

   Chemistry Of Materials, Vol. 4, Issue 5, pp. 1053 - 1065.

   Journal Article  |  Full Text Online

3. Case Study: Advanced Placement Calculus in the Age of the Computer Algebra System 2003

   https://ncsu.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwhV1LS8NAEB6kJz34qIq1KnvwGtp9JJuVUojF4kVR6D3sZpNWKVUaPfjvnd1sqj2It0DYSdhJZufx8X0A1wZrfyW5iWLLbSQsk5GJtYyUtBUvtVFamu1mTgOiqQOs0uMC_RQfEySzLLFAT71Mt4u0grsS6_FW_cRbkQ5bYVbMnjfIwu3oysORMT2A5_ZhHini9Al-Q-YHnqbQc1O0lIz_vtgh7If8kWSNw49gp1x1nfRygGl0Ye9hQ8RaH0M-wVOKjBZjhxf8Gg0W4xuShbE_eXItdNcdJBO9dG3AmrysCK4m2bwkb5W_bGUfSLacuyGzN-bpn521E5hN72aT-yhoKkSvQtGIi4LKYZGYpGCsotSmjJZCJwlTLC4MSwtmMSHSwlIjtVVUO4oybqQwFcfki58BwZzPYphkVsdKGMs0ujmmBksjyzja6MGp36j8veHLyNtd6kG_dUge_pQabwpHiTek538t68Nug6BzfY8L6HysP8tL6Dh_Xfkv4RtdK7M2

   Dick, Thomas P.; Dion, Gloria S.; Wright, Craig L.

   The Mathematics Teacher, Vol. 96, Issue 8, pp. 588 - 596.

   Dick et al discuss the implications of computer algebra system (CASs) to mathematical education using the advanced placement (AP) calculus that serves as a case study of a program that has had to c... Read more

   Dick et al discuss the implications of computer algebra system (CASs) to mathematical education using the advanced placement (AP) calculus that serves as a case study of a program that has had to come to grips with a variety of CAS-related issues in curriculum, instruction, and assessment. Allowing students to use CASs has affected the content of the AP calculus courses and the examinations, thereby raising various concerns regarding the use and abuse of such technological system. Read less

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