Autor: Nelson, A. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Bruno Schulz - parabola komety
Autorzy:: Nelson, Marilyn A.
Współwytwórcy:: Olszowy, Anna. Tłumaczenie
Tematy:: Schulz, Bruno (1892-1942) twórczość.; Pokaż więcej
Cytata wydawnicza:: Kresy 1996, nr 3, s. 121-127
Dostawca treści:: Bibliografia

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Skocz do pozycji: 2.

Tytuł:: Udręka porzuconego dziecka
Autorzy:: Nelson, Charles A.
Współwytwórcy:: Fox, Nathan A.
Zeanah, Charles H.
Tematy:: Ceauşescu, Nicolae (1918-1989).
Sieroctwo psychologia
Wychowankowie domów dziecka socjologia Rumunia od 1944 r.
Rozwój psychofizyczny dziecka; Pokaż więcej
Cytata wydawnicza:: Świat Nauki 2013, nr 5, s. 48-53
Dostawca treści:: Bibliografia

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Skocz do pozycji: 3.

Tytuł:: A calculation model for liquid-liquid extraction of protactinium by 2,6-dimethyl-4-heptanol
Autorzy:: Knight, A. W.
Eitrheim, E. S.
Nelson, A. W.
Schultz, M. K.
Tematy:: design of experiments
protactinium
solvent extraction; Pokaż więcej
Wydawca:: Instytut Chemii i Techniki Jądrowej
Powiązania:: https://bibliotekanauki.pl/articles/146380.pdf Link otwiera się w nowym oknie
Opis:: Reprocessing of spent nuclear fuel usually employs the solvent extraction technique to recover fissile material, isolate other valuable radionuclides, recover precious metals, and remove contaminants. Effi cient recovery of these species from highly radioactive solutions requires a detailed understanding of reaction conditions and metal speciation that leads to their isolation in pure forms. Due to the complex nature of these systems, identification of ideal reaction conditions for the efficient extraction of specific metals can be challenging. Thus, the development of experimental approaches that have the potential to reduce the number of experiments required to identify ideal conditions are desirable. In this study, a full-factorial experimental design was used to identify the main effects and variable interactions of three chemical parameters on the extraction of protactinium (Pa). Specifi cally we investigated the main effects of the anion concentration (NO3 –, Cl–) extractant concentration, and solution acidity on the overall extraction of protactinium by 2,6-dimethyl-4-heptanol (diisobutylcarbinol; DIBC) from both HCl and HNO3 solutions. Our results indicate that in HCl, the extraction of protactinium was dominated by the solution acidity, while in nitric acid the extraction was strongly effected by the [DIBC]. Based on our results, a mathematical model was derived, that describes the relationship between concentrations of anions, extractant, and solution acidity and the expected values of Pa distribution coefficients in both HCl and HNO3. This study demonstrates the potential to predict the distribution coefficient values, based upon a mathematical model generated by a full-factorial experimental design.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Growth and characterisation of LWIR T2SL on (100)-, (211)- and (311)-oriented GaSb substrates
Autorzy:: Lubyshev, Dmitri
Fastenau, Joel M.
Kattner, Michael
Frey, Philip
Nelson, Scott A.
Flick, Ryan
Wu, Ying
Liu, Amy W. K.
Szymanski, Dennis E.
Martinez, Becky
Furlong, Mark J.
Dennis, Richard
Bundas, Jason
Sundaram, Mani
Tematy:: focal plane arrays
InAs/InAsSb
photodetectors
long wavelength infrared type-II superlattice
metamorphic buffers
superlattice period reduction; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Powiązania:: https://bibliotekanauki.pl/articles/2204213.pdf Link otwiera się w nowym oknie
Opis:: Ga-free InAs/InAsSb type-II superlattice structures grown on GaSb substrates have demonstrated high performance for mid-wave infrared applications. However, realisation of long wavelength infrared photodetectors based on this material system still presents challenges, especially in terms of reduced quantum efficiency. This reduction is due, in part, to the increased type-II superlattice period required to attain longer wavelengths, as thicker periods decrease the wave-function overlap for the spatially separated quantum wells. One way to improve long wavelength infrared performance is to modify the type-II superlattice designs with a shorter superlattice period for a given wavelength, thereby increasing the wave-function overlap and the resulting optical absorption. Long wavelength infrared epitaxial structures with reduced periods have been realised by shifting the lattice constant of the type-II superlattice from GaSb to AlSb. Alternatively, epitaxial growth on substrates with orientations different than the traditional (100) surface presents another way for superlattice period reduction. In this work, the authors evaluate the performance of long wavelength infrared type-II superlattice detectors grown by molecular beam epitaxy using two different approaches to reduce the superlattice period: first, a metamorphic buffer to target the AlSb lattice parameter, and second, structures lattices matched to GaSb using substrates with different orientations. The use of the metamorphic buffer enabled a ~30% reduction in the superlattice period compared to reference baseline structures, maintaining a high quantum efficiency, but with the elevated dark current related to defects generated in the metamorphic buffer. Red-shift in a cut-off wavelength obtained from growths on highindex substrates offers a potential path to improve the infrared photodetector characteristics. Focal plane arrays were fabricated on (100), (311)A- and (211)B-oriented structures to compare the performance of each approach.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Protocols for x-ray transient grating pump/optical probe experiments at x-ray free electron lasers
Autorzy:: Lima, Frederico
Feurer, Thomas
Biednov, Mykola
Zalden, Peter
Serrat, Carles
Dhanalakshmi-Veeraraj, Mano R
Mincigrucci, Riccardo
Staub, Urs
Madsen, Anders
Vila-Comamala, Joan
Knoll, Martin
Bañares, Luis
Cucini, Riccardo
Chergui, Majed
Torre, Renato
Paltanin, Ettore
Ardana-Lamas, Fernando
Frankenberger, Paul
Heder, Siti
Khatu, Nupur N
Rossi, Giorgio
Masciovecchio, Claudio
Szlachetko, Jakub
Gessini, Alessandro
Ferrari, Eugenio
Maznev, Alexei A
Cannizzo, Andrea
Nelson, Keith A
Carrara, Pietro
Milne, Christopher
Berndt, Nadia
Bonetti, Stefano
Beye, Martin
Huang, Xinchao
Bencivenga, Filippo
Fainozzi, Danny
Brioschi, Marta
David, Christian
Mamyrbayev, Talgat
Scholz, Markus
Xu, Han
Gawelda, Wojciech M
Bargheer, Matias
Svetina, Cristian
Engel, Robin Y.
Opis:: Transient grating spectroscopy is a specialized application of the four-wave-mixing methodology and constitutes a versatile technique for investigating the dynamics of vibrational, magnetic and electronic degrees of freedom of matter in a background-free fashion. Recent developments in free-electron laser sources have enabled the extension of this technique into the extreme ultraviolet range. Ongoing efforts to expand transient grating spectroscopy into the x-ray regime promise numerous advantages: (1) substantial penetration depths that allow for probing bulk material properties, (2) element specificity via specific core-excited states, and (3) short wavelengths that allow for excitation gratings with higher momentum transfer and improved spatial resolution. In this study, we comprehensively outline the procedures for conducting x-ray transient grating pump/optical probe experiment. The process encompasses the design and alignment of the experimental setup, as well as the subsequent steps involved in data acquisition and analysis. This paper is intended as a comprehensive guide for researchers interested in implementing x-ray transient grating spectroscopy, providing valuable insights into the intricacies of the experimental workflow required for this novel technique. Furthermore, we discuss the potential for extending this methodology to an x-ray pump/x-ray probe scheme, envisioning a future direction that holds promise for enhancing the capabilities and scope of x-ray transient grating spectroscopy, opening new opportunities for studying ultrafast processes with unprecedented temporal and spatial resolutions.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego