Luminescence and defect centres in MgSrAl(10)O(17):Sm(3+) phosphor

An efficient reddish orange emission MgSrAl(10)O(17):Sm(3+) phosphor was prepared by the combustion method. The phosphor has been characterized by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis measurements. Photoluminescence spectrum revealed that samarium ions are present in trivalent oxidation states. The phosphor exhibits two thermally stimulated luminescence (TSL) peaks at 210 degrees C and 450 degrees C. Electron spin resonance studies were carried out to identify the defect centres responsible for the TSL process in MgSrAl(10)O(17):Sm(3+) phosphor. Three defect centres have been identified in irradiated phosphor and these centres are tentatively assigned to an O(-) ion and F(+) centres. O(-) ion (hole centre) correlates with the 210 degrees C TSL peak while one of the F+ centres (electron centre) appears to relate to the 450 degrees C TSL peak. (C) 2010 Elsevier B.V. All rights reserved.

Intralamellar structural modifications related to the proton exchanging in K(4)Nb(6)O(17) layered phase

Basic structural aspects about the layered hexaniobate of K(4)Nb(6)O(17) composition and its proton-exchanged form were investigated mainly by spectroscopic techniques. Raman spectra of hydrous K(4)Nb(6)O(17) and H(2)K(2)Nb(6)O(17)center dot H(2)O show significant modifications in the 950-800 cm(-1) region (Nb-O stretching mode of highly distorted NbO(6) octahedra). The band at 900 cm(-1) shifts to 940 cm(-1) after the replacement of K(+) ion by proton. Raman spectra of the original materials and the related deuterated samples are similar suggesting that no isotopic effect occurs. Major modifications were observed when H(2)K(2)Nb(6)O(17) was dehydrated: the relative intensity of the band at 940 cm(-1) decreases and new bands seems to be present at about 860-890 cm(-1). The H(+) ions should be shielded by the hydration sphere what preclude the interaction with the layers. Removing the water molecules, H(+) ions can establish a strong interaction with oxygen atoms, decreasing the bond order of Nb-O linkage. X-ray absorption near edge structure studies performed at Nb K-edge indicate that the niobium coordination number and oxidation state remain identical after the replacement of potassium by proton. From the refinement of the fine structure, it appears that the Nb-Nb coordination shell is divided into two main contributions of about 0.33 and 0.39 nm, and interestingly the population, i.e., the number of backscattering atoms is inversed between the two hexaniobate materials. 2009 Elsevier Ltd. All rights reserved.

Sociologförbundet har ordet : Världskongress i Sverige nästa år. Internationella sociologförbundets XVII kongress i Göteborg den 11-17 juli 2010

Sociologisk Forsknings digitala arkiv

Rosenthal, Bob, interviewed by Becky Muller on January 17, 2009: Audio

Some of the themes discussed are: • Civic engagement (2) • The Levine family (2) • High school—private (3) • Colby (4) • Colby—student interaction with Waterville Jews (5) • Dating (6, 7, 18-20) • Life in Waterville (8, 10) • Life in Waterville—movies (12-13) • Colby—Greek life (9) • Colby—administration (9-10) • Occupation—real estate development (10-12, 13, 17) • Camp—Arcadia (13-14) • Military service (16) • Civic engagement (22) • Jewish education (23) • Holidays (23-24)

Rosenthal, Bob, interviewed by Becky Muller on January 17, 2009: Audio Part Two

Some of the themes discussed are: • Civic engagement (2) • The Levine family (2) • High school—private (3) • Colby (4) • Colby—student interaction with Waterville Jews (5) • Dating (6, 7, 18-20) • Life in Waterville (8, 10) • Life in Waterville—movies (12-13) • Colby—Greek life (9) • Colby—administration (9-10) • Occupation—real estate development (10-12, 13, 17) • Camp—Arcadia (13-14) • Military service (16) • Civic engagement (22) • Jewish education (23) • Holidays (23-24)

Shiro, Burt and Phyllis, interviewed by Sam Levine on January 17, 2010: Audio Recording

Some of the themes discussed are: • Occupation—store, The Jefferson Hotel (2, 4-6, 11, 17-18) • Food (2) • Colby—Greek life (3, 7) • Military service (3-4) • Bar Mitzvah (6, 12) • Life in Waterville—Circus (6) • Anti-semitism (10-12) • Occupation—law (8-9) • Occupation—legislature (14) • Jewish education (12) • Synagogue (13) • Civic engagement—United Way (15) • Civic engagement (26-28) • Camp—Modin (18) • College—attendance (19) • Colby—football (20-21, 23, 30)

Rosenthal, Bob, interviewed by Becky Muller on January 17, 2009: Transcript

Some of the themes discussed are: • Civic engagement (2) • The Levine family (2) • High school—private (3) • Colby (4) • Colby—student interaction with Waterville Jews (5) • Dating (6, 7, 18-20) • Life in Waterville (8, 10) • Life in Waterville—movies (12-13) • Colby—Greek life (9) • Colby—administration (9-10) • Occupation—real estate development (10-12, 13, 17) • Camp—Arcadia (13-14) • Military service (16) • Civic engagement (22) • Jewish education (23) • Holidays (23-24)

Shiro, Burt, and Phyllis, interviewed by Sam Levine on January 17, 2010: Transcript

Some of the themes discussed are: • Occupation—store, The Jefferson Hotel (2, 4-6, 11, 17-18) • Food (2) • Colby—Greek life (3, 7) • Military service (3-4) • Bar Mitzvah (6, 12) • Life in Waterville—Circus (6) • Anti-semitism (10-12) • Occupation—law (8-9) • Occupation—legislature (14) • Jewish education (12) • Synagogue (13) • Civic engagement—United Way (15) • Civic engagement (26-28) • Camp—Modin (18) • College—attendance (19) • Colby—football (20-21, 23, 30)