443 research outputs found
Co film stretching induced by lattice mismatch and annealing : The role of Graphene
No full textThin Co films intercalated between a Graphene capping layer and the Ir(111) surface are of interest for spintronics applications due to their peculiar magnetic properties and to their chemical stability. The structure, and then the magnetic properties, of the Co films depend on the intercalation process which is strongly influenced by the temperature, total amount of Cobalt and quality of the capping Graphene layer. In order to identify and disentangle the effects of these contributions, we report on the structural characterisation of four Co films as a function of thickness, annealing temperature, and Graphene capping. From the structural point of view, the deposition of Co on a hot Ir substrate mimics quite well the intercalation process proving the validity of the colander model describing the Graphene role during the process
Bull Threshers and Bindlestiffs: Harvesting and Threshing on the North American Plains
No full textThomas D. Isern is Professor of History & University Distinguished Professor of History at North Dakota State University. He is the author and coauthor of six books, including Dakota Circle: Excursions on the True Plains and Custom Combining on the Great Plains.This Kansas Open Books title is funded by a grant from the National Endowment for the Humanities and the Andrew W. Mellon Foundation Humanities Open Book Program.Bull Threshers and Bindlestiffs is a panorama on a continental canvas: the Great Plains of North America, stretching from Texas to Alberta. Onto this surface the author lays the large features of regional practice in the harvesting and threshing of wheat during the days before the combined harvester harvesting with binder and header, threshing with bull thresher and steam engine. Into the picture he places the key figures who accomplished the task of gathering the grain the farm men and women, the custom threshermen, and the bindlestiffs, or itinerant laborers. Affectionately he sketches the small details of folklife that comprised the everyday work and culture of the wheat belt building shocks, loading racks, constructing stacks, pitching bundles into the separator, hauling water to the engine, drinking deep from the crockery water jug. Bull Threshers and Bindlestiffs is a profusely illustrated study of a complex, vigorous regional culture concerned with the production of wheat a culture that centered around the annual harvest and declined with the advent of the combine. This is an examination of the interaction of culture, environment, and technology with import for the fields of agricultural history and regional history. More than that, with its grassroots research, its descriptions of tools and customs, and its lavish illustrations, it is a re-creation of a proud phase of regional life previously captured only in yellowed albumen photographs
Gypsum from soils of chesas, NE Spain [Dataset]
No full textDocuments:
Chesas_Thin_sections_scans.zip
Chesas_Fig.captions1991-01.xlsxWe show data of soils developed on the outcropping gypseous nucleus of the Barbastro-Balaguer anticline, NE Spain. Chesas is the local name for the lands of this outcrop that stand out by their whitish tones. The data collected here come from soils of the municipalities —from West to East— of Peraltilla, Almunia de San Juan, Tamarite, Torá, and Iborra. The analytical methods plus details of the landscape and sampling sites can be found in: (i) the book entitled “Morfología y génesis de suelos sobre yesos” (http://hdl.handle.net/10261/84695), and (ii) the article entitled “Salada Farrachuela, a saline wetland in Tamarite de Litera, Spain” (DOI: 10.29077/bol.114.ce05.herrero).
Here we present a compressed zip file with 302 TIFF images corresponding to 151 thin sections of these soils. Most of the sections —with the prevalent size of 13.5 × 5.7 cm— were manufactured by the first author in the Institut National Agronomique de Paris-Grignon under the technical supervision of Mr. P. Guilloré, in the context of a scholarship granted by the Government of France for working in the lab of Dr. N. Fédoroff. The surviving thin sections from chesas are archived and scanned at the EEAD-CSIC in Zaragoza, Spain. Their scans are compiled in the file “Chesas_Thin_sections_scans.zip”.
Several dozen micrographs of the chesas thin sections appeared in the abovementioned book published in 1991 (http://hdl.handle.net/10261/84695). The file “Chesas_Fig.captions1991-01.xlsx” presents a tentative English translation of the 154 Figure captions for the micrographs and the other figures in the book.We acknowledge the grant PID2021-127170OB-I00 funded by MCIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”, and the grant TED2021-130303B-I00 funded by MCIN/AEI/10.13039/501100011033 and by the “European Union NextGeneration EU/PRTR”.Peer reviewe
Ground composition data for the southernmost area of Lérida province, NE Spain [Dataset]
No full textMore than 3000 physical, chemical and morphological data of soils described between December 1980 and July 1981 in the southernmost part of the province of Lérida, NE Spain, are collected in this dataset. The soils are located between the coordinates 41.62°N 1.06°E, and 41.28°N 0.34°E.
Most of the soil samples were taken in backhoe dug pits where their profiles were described. The data —presented here in an Excel spreadsheet— come from the book by J. Porta & R. Julià (eds.) published in 1982 with I.S.B.N. 84-5008771-6. Moreover, two chapters were scanned from this book and included in this dataset as “Description.pdf” and “FormationClassification.pdf”. The author did not proofread the galley proofs of these chapters. The data contained in “Description.pdf” were manually transcribed in 2025 to the excel file “ProfilesLerida04clas.xlsx”.
Care must be taken with the location coordinates given the non-correction of the galley proofs and because the resources available to us 45 years ago were quite rudimentary. The excel file “ProfilesLerida04clas.xlsx” incorporates the correction of obvious errors in the coordinates and their transformation to ETRS89 from the notations used in 1980-81. The help of Ms. Rosa Gómez-Báguena with the coordinates is greatly appreciated.
We also present the file "1989 XVI Reun.SECS Lérida suelos secano", a report including discussion and data about the studied soils.This research was possible thanks to the grant PID2021-127170OB-I00 funded by
MCIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe”, and the grant
TED2021-130303B-I00 funded by MCIN/AEI/10.13039/501100011033 and by the “European Union NextGeneration EU/PRTR”.Peer reviewe
Late Quaternary Paleoceanography of the Central Equatorial Pacific:A Quantitative Record of Planktic Foraminiferal, Isotopic, Organic Carbon and Calcium Carbonate Changes
No full textThe Type Ia Supernova Rate at z 0.4
No full text9 pages, 3 Postscript figures, uuencoded uses crckapb.sty and psfig.sty. To appear in Thermonuclear Supernovae (NATO ASI), eds. R. Canal, P. Ruiz-LaPuente, and J. Isern. Postscript version is also available at http://www-supernova.lbl.gov/We present the first measurement of the rate of Type Ia supernovae at high redshift. The result is derived using a large subset of data from the Supernova Cosmology Project as described in more detail at this meeting by Perlmutter et al. (1996). We present our methods for estimating the numbers of galaxies and the number of solar luminosities to which the survey is sensitive, the supernova detection efficiency and hence the control time. We derive a rest-frame Type Ia supernova rate at z~0.4 of 0.82^+0.54_-0.37 ^+0.42_-0.32 h^2 SNu where the first uncertainty is statistical and the second includes systematic effects
Wederopbouw Managua Centrum; Reconstruction del area central: Differentiatie ontwikkelingslanden studenten projekten tussen 1983 en 1985
No full textArchitectur
Polyhydroxyalkanoates production by an advanced food-on-demand strategy: The effect of operational conditions
No full textDespite the increasing number of studies related to the polyhydroxyalkanoate (PHA) production from sewage sludge of wastewater treatment plants, there is still a gap in the correlation between the operational conditions, such as the organic loading rate (OLR), and the intracellular polyhydroxyalkanoate (PHA) content, productivity and final recovery of the polymer. Therefore, this work aims to provide experimental data on PHA productivity and purity in view of scaling up the process to an industrial level taking into account process parameters. In view of that, three OLR were applied during the selection of PHA-accumulating bacteria in sewage sludge. Then, the biomass was harvested and subjected to batch accumulation experiments at two organic loads per dosage by employing a tailor-made software to adopt an automated feed-on-demand strategy, which allowed for 30–56 h of accumulation tests in stand-alone mode. Finally, an improved protocol for PHA extraction has been applied. Experimental results show that the maximum PHA content (60% w/w) was achieved using the highest organic load per dosage during the accumulation test with the biomass selected at the highest OLR (1.8 g COD L−1 d−1). Also, the extraction protocol efficiency was proven with four samples with different PHA content, achieving recovery yield as high as 78 ± 3 % with a purity of 89 ± 2 %, thus demonstrating that the adopted strategy might be beneficial for industrial use
Characterization of lignin streams during bionic liquid-based tretreatment from grass, hardwood, and softwood
No full textDelignification as a function of ionic liquid (IL) pretreatment has potential in terms of recovering and converting the fractionated lignin streams to renewable products. Renewable biogenic ionic liquids, or bionic liquids (e.g., cholinium lysinate, ([Ch][Lys])), provide opportunities in terms of effective, economic, and sustainable lignocellulosic biomass pretreatment. We have evaluated [Ch][Lys] pretreatment in terms of sugar and lignin yields for three different feedstocks: switchgrass, eucalyptus, and pine. Four lignin streams isolated during [Ch][Lys] pretreatment and enzymatic hydrolysis were comprehensively analyzed, tracking their changes in physical-chemical structures. We observed changes in major lignin linkages and lignin aromatics units (p-hydroxyphenyl (H), guaiacyl (G), and syringil (S)) that occurred during pretreatment. A compositional analysis of the different process streams and a comprehensive mass balance in conjunction with multiple analytical techniques (nuclear magnetic resonance (NMR), mass spectroscopy, gel permeation chromatography (GPC)) is presented. Qualitative and quantitative analyses indicates that there are significantly more lignin-carbohydrate interactions for G-rich lignin in pine. The lignin removal and extent of lignin depolymerization for switchgrass and eucalyptus were higher than pine and follows the order of switchgrass > eucalyptus > pine. The insights gained from this work contribute to better understanding of physiochemical properties of lignin streams generated during [Ch][Lys] pretreatment, offering a starting point for lignin valorization strategies
Influencia de la densidad de siembra en el crecimiento de alevinos de banda negra, Myleus schomburgkii (Pisces, Serrasalmidae) criados en jaulas
No full textEn el presente trabajo investigación, se determinó la influencia de la densidad de siembra
en el crecimiento de alevines de banda negra Myleus schomburgkii {Pisces, Serrasalmidae)
criados en jaulas.
El estudio fue realizado de Agosto a Diciembre del 2011, en uno de los estanques del
Centro de Investigación~ Experimentación y Enseñanza - Piscigranja Quistococha de la
Universidad Nacional de la Amazonia Peruana, ubicado en el km. 6 de la Carretera !quitosNauta.
El diseño experimental que se utilizó fue el DCA {Diseño Completamente al Azar), se
utilizaron 3 tratamientos con 3 repeticiones, dando un total de 9 jaulas experimentales, los
tratamientos utilizados fueron T1: 3 peces/m3
, T2: 9 peces/m3 y T3: 15 peces/m3
.
Se sembraron un total de 81 alevines de (/banda negra" obtenidos del medio natural con
peso y longitud promedio inicial de 2.49 g y 4.64 cm para el T1, 2.32 g y 4.57 cm para el T2
y 2.33 g y 4.56 cm para el T3. El alimento utilizado fue una dieta balanceada peletizada con
30% de proteína bruta, los peces fueron alimentados dos veces por día {07:00 h y 16:00 h),
a razón de 5% de la biomasa.
Vlll
Los datos obtenidos en 158 días de cultivo, con peso y longitud promedio final de: 84.11 g
y 13.98 cm para el T1, 62.22 g y 12.73 cm para el T2 y 54.35 g y 12.33 cm para el T3,
mostrando diferencia significativa en peso (T1 > T2 > T3) y en longitud (T1 > T2 > T3).
El registro de los parámetros limnológicos monitoreados quincenalmente, tuvo los
siguientes valores promedios: TQ: 27.8°C, 0 2 : 4.6mg/l, C02 : 11.4 mg/l, pH: 5.9, Amonio:
0.1mg/L y Transparencia: 60cm. El 100% de sobrevivencia de los peces sometidos al
proceso experimental, indica que esta especie es bastante resistente al manipuleo,
además de soportar cambios moderados en los parámetros físicos y químicos del agua del
estanque.Tesi
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