35,630 research outputs found
Investigation on the chemical, structural and mechanical properties of carbon-germanium films deposited by dc-magnetron sputtering
No full textAmorphous carbon-germanium films were deposited by de-magnetron sputtering onto Si substrates leading to a set of films with GejC ratios ranging from 0 to 2. Nuclear techniques. Rutherford backscattering spectrometry and elastic recoil detection analysis, provided both the composition and the atomic density of the films. Raman results suggest that carbon and germanium atoms are segregated into distinct amorphous domains. X-ray diffraction analysis was also performed and the results confirmed the amorphous character of the films. already determined by Raman spectroscopy. The internal stress of the films was obtained by measuring the bending of the substrates and the hardness was measured by a nanoindentation technique. These mechanical properties were correlated to the Ge content of the films; an important reduction in both hardness and internal stress with the Ge incorporation was observed
sj-docx-1-saj-10.1177_08897077231198971 – Supplemental material for Association of MOUD ECHO Participation on Expansion of Buprenorphine Prescribing in Rural Primary Care
No full textSupplemental material, sj-docx-1-saj-10.1177_08897077231198971 for Association of MOUD ECHO Participation on Expansion of Buprenorphine Prescribing in Rural Primary Care by Julie G. Salvador, Orrin B. Myers, Snehal R. Bhatt, Vanessa Jacobsohn, Larissa Lindsey, Rana S. Alkhafaji, Heidi Rishel Brakey and Andrew L. Sussman in Substance Abuse</p
Raman spectroscopy and scanning electron microscopy investigation of annealed amorphous carbon-germanium films deposited by d.c. magnetron sputtering
No full textThe precipitation of germanium nanocrystals in amorphous carbon–germanium films allows for the development of innovative
devices, but the accurate control of both size and size distribution of Ge quantum dots in these matrices still constitutes a
challenging step. In this paper, both the structure and morphology of amorphous carbon–germanium films (a-Ge1−xCx), deposited by d.c. magnetron sputtering onto silicon substrates and annealed in vacuum at temperatures up to 550 °C, are investigated by Raman spectroscopy and scanning electron microscopy. The main features of Raman spectra obtained from carbon-rich films (x>0.43) are the D and G bands, characteristic of graphitic carbon films. The ratio between the intensities of the bands, ID/IG, increases with the annealing temperature, suggesting a progressive increase of the graphitic domains within the films. Raman spectra obtained in the low frequency region from both as-deposited and annealed germanium-rich films (x<0.43) show broad bands associated with transverse acoustic and transverse optic Ge–Ge modes. Ge–Ge optic modes merge up into a well-shaped peak at 300 cm−1 in the germanium-richest sample, and underwent annealing treatment at 550 °C, thus indicating the precipitation
of crystalline Ge. Scanning electron microscopy analysis shows an apparently uniform nucleation of Ge crystallites at the sample
surface. Microprobe Raman scattering results suggest the formation of a nearly homogeneous distribution of Ge nanocrystals in germanium-rich films annealed at 550 °C
Spectral engineering of LaF3:Ce3+ nanoparticles: The role of Ce3+ in surface sites
No full textDue to the high surface-to-volume ratio, luminescence centers on the surface have relative dominance in the overall spectral response of nanoparticles. The luminescence of LaF3:Ce3+ nanoparticles was investigated in the spectral and temporal domains with a particular focus on the role of Ce3+ on the surface. These nanoparticles present two luminescence bands at 4.10eV and 4.37 eV attributed to Ce3+ transitions from the 5d level to the spin-orbit split 4f ground levels F-2(5/2) and F-2(7/2), in addition to a low-energy band at 3.62 eV that has been attributed to Ce3+ ions residing in perturbed sites. The growth of up to three undoped shells, ca. 0.9 nm thick each, around the core promoted a progressive enhancement of luminescence output, concomitant with an increase in the fluorescence lifetime due to the weakening of energy transfer through multipolar interaction between Ce3+ in the core and quenching defects on the surface. Also, the growth of the first shell led to a decrease in the relative intensity of the low-energy band and a 0.23 eV shift to higher energies. These results were interpreted as being due to the existence of two types of perturbed sites, one on the surface that is eliminated by the growth of the first shell, and another within the volume of the nanoparticle, similar to observations in bulk single crystals. This work demonstrates how surface engineering can affect and control the luminescence behavior of this nanomaterial. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3700343
Growth kinetics and relationship between structure and mechanical properties of a-C(N): H films deposited in acetylene-nitrogen atmospheres
No full textAmorphous hydrogenated carbon–nitrogen films, a-C~N!:H, were deposited by plasma enhanced chemical vapor deposition using acetylene–nitrogen mixtures. Film composition and density were
determined by means of ion beam techniques being the film microstructure studied by infrared and Raman spectroscopies. Films were obtained with nitrogen content up to 22 at. %. As for films -obtained using other gas mixtures, the deposition rate showed a strong decrease upon nitrogen incorporation, although with a smaller rate. The film growth kinetic is discussed and some specific features of acetylene–nitrogen precursor gas mixtures are pointed out. A remarkable decrease on the C atom sp3 fraction was inferred for nitrogen contents higher than 10 at. %, and was correlated to the film density behavior. The mechanical hardness and internal stress were relatively insensitive to
low nitrogen incorporation, with a systematic decreasing behavior for nitrogen contents above 10
at. %
Kritischer Bericht über wichtigere Arbeiten auf dem Gebiete der Physiologie des Centralnervensystems der Wirbelthiere [51 Artikel (1896-1899) von L. Bach, Bikeles, Bunch, R. F. Fuchs, L. Jacobsohn, Kohnstamm, Steinach, Stewart, Wana, Batelli, Kreidl, Lozano y Monzon, M. Sander, A. Stefani, Bernheimer, Panegrossi, H. Pfister, Topolanski, Tümianzew, Lo Monaco, Sellier et Verger, F. Alt, Bary, Bechterew, A. Bickel, Du Bois-Reymond u. Silex, Bonhoeffer, Eckhard, H. E. Hering, Liepmann, Lugaro, Mann, Martin, Münzer u. Wiener, Pugliese, E. A. Schaefer, J. Starke, Stoddart, Ziehen, Biedl u. Reiner, Cyon, Hutchinson, Daddi, Howell, G. Levi, Querton, Sivén, Spina]
No full textKRITISCHER BERICHT ÜBER WICHTIGERE ARBEITEN AUF DEM GEBIETE DER PHYSIOLOGIE DES CENTRALNERVENSYSTEMS DER WIRBELTHIERE [51 ARTIKEL (1896-1899) VON L. BACH, BIKELES, BUNCH, R. F. FUCHS, L. JACOBSOHN, KOHNSTAMM, STEINACH, STEWART, WANA, BATELLI, KREIDL, LOZANO Y MONZON, M. SANDER, A. STEFANI, BERNHEIMER, PANEGROSSI, H. PFISTER, TOPOLANSKI, TÜMIANZEW, LO MONACO, SELLIER ET VERGER, F. ALT, BARY, BECHTEREW, A. BICKEL, DU BOIS-REYMOND U. SILEX, BONHOEFFER, ECKHARD, H. E. HERING, LIEPMANN, LUGARO, MANN, MARTIN, MÜNZER U. WIENER, PUGLIESE, E. A. SCHAEFER, J. STARKE, STODDART, ZIEHEN, BIEDL U. REINER, CYON, HUTCHINSON, DADDI, HOWELL, G. LEVI, QUERTON, SIVÉN, SPINA]
Zeitschrift für Psychologie und Physiologie der Sinnesorgane (-)
Zeitschrift für Psychologie und Physiologie der Sinnesorgane (22) (a0006)
Kritischer Bericht über wichtigere Arbeiten auf dem Gebiete der Physiologie des Centralnervensystems der Wirbelthiere [51 Artikel (1896-1899) von L. Bach, Bikeles, Bunch, R. F. Fuchs, L. Jacobsohn, Kohnstamm, Steinach, Stewart, Wana, Batelli, Kreidl, Lozano y Monzon, M. Sander, A. Stefani, Bernheimer, Panegrossi, H. Pfister, Topolanski, Tümianzew, Lo Monaco, Sellier et Verger, F. Alt, Bary, Bechterew, A. Bickel, Du Bois-Reymond u. Silex, Bonhoeffer, Eckhard, H. E. Hering, Liepmann, Lugaro, Mann, Martin, Münzer u. Wiener, Pugliese, E. A. Schaefer, J. Starke, Stoddart, Ziehen, Biedl u. Reiner, Cyon, Hutchinson, Daddi, Howell, G. Levi, Querton, Sivén, Spina] (22) (p0268
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
I Żywoty Świętych di Łazarz Baranowicz,
No full textThe Author discusses the Polish written work by the Ukrainian writer L. Baranowicz, focusing on the problems of genre, stylistic features, national and religious identity, similaraties or differencies with contemporary European baroque works belonging to analogous genres
Comparative study of anneal-induced modifications of amorphous carbon films deposited by dc magnetron sputtering at different argon plasma pressures
No full textThis work investigates the evolution of the structural, mechanical and tribological properties of amorphous carbon films (a-C )
undergoing thermal annealing. Two different types of a-C film were studied: hard, stressed and dense films, henceforth called
‘diamond-like’, and soft, more relaxed and less dense films, called ‘polymer-like’. The two sets of films were deposited by dc
magnetron sputtering at 0.36 and 1.4 Pa argon plasma pressures, respectively, and both were annealed in vacuum for 1 h at temperatures between 300 and 700°C. Raman results provided indications of a remarkable increase of the sp2 hybridized domains,
that occurs mainly at temperatures higher than 400°C for the diamond-like films and in a continuous way for the polymer-like
films. The friction coefficient of both types of film approaches the same value with increasing temperature, whereas the surface
roughness is nearly constant. For diamond-like films, the hardness and compressive internal stress are nearly constant up to 500°C, and then undergo a fast decrease. In contrast, the hardness of the polymer-like film continuously decreases with temperature,
whereas the compressive stress remains constant
Letter From Nora G. to Alfred L. Shoemaker, March 17, 1948
No full textA handwritten letter from Nora G. addressed to Alfred L. Shoemaker, dated March 17, 1948. Within, the author provides a list of old weather predictions accredited to Peter Derro, as well as information about special Saints\u27 days and agricultural advice.https://digitalcommons.ursinus.edu/shoemaker_documents/1104/thumbnail.jp
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