Sintering behavior, microstructure, and microwave dielectric properties of Ca0.66Ti0.66Sm0.34Al0.34O3 ceramics
CERAMICS INTERNATIONAL
Authors: Xu, Yue; Fu, Renli; Agathopoulos, Simeon; Yang, Yang; Cai, Junde; Xie, Xiaotong
Abstract
Ca0.66Ti0.66Sm0.34Al0.34O3 (CTSA) ceramics were produced using a solid-state reaction method, and their sintering behavior, microwave dielectric properties, and microstructure were investigated. Sintering temperature affected the unit cell volume and the lattice parameters of the CTSA ceramics as well as the grain size distribution, the Gibbs free energy, the thermal expansion coefficient (CTE), and the dielectric properties (epsilon(r), Qxf, tau(f)). The samples sintered at 1500 degrees C displayed the best dielectric constant and Qxf, as 42.49 and 46069.86 GHz, respectively.
Eulogy for the clinical research center
JOURNAL OF CLINICAL INVESTIGATION
Authors: Nathan, David G.; Nathan, David M.
Abstract
The extramural General Clinical Research Center (GCRC) program has been funded for more than 50 years, first by the National Center for Research Resources, NIH, and more recently as part of the Clinical Translational Science Award (CTSA) program through the newly formed National Center for Advancing Translation Sciences (NCATS). The GCRCs represent the federally funded laboratories that employ a highly trained cadre of research nurses, dietitians, and other support staff and in which generations of clinical investigators trained and performed groundbreaking human studies that advanced medical science and improved clinical care. Without the opportunity for adequate discussion, NCATS has now stopped funding these Research Centers. In this "eulogy," we review the origins and history of the GCRCs, their contributions to the advancement of medicine, and the recent events that have essentially defunded them. We mourn their loss.
COA
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