Letteratura scientifica selezionata sul tema "SANS data point"
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Articoli di riviste sul tema "SANS data point"
1
Carsughi, F., D. Bellmann, J. Kulda, M. Magnani e M. Stefanon. "Absolute Calibration of Small-Angle Neutron Scattering Data of a Double-Crystal Diffractometer". Journal of Applied Crystallography 30, n. 5 (1 ottobre 1997): 857–61. http://dx.doi.org/10.1107/s0021889897001179.
Testo completoAbstract (sommario):
Small-angle neutron scattering (SANS) experiments generally provide the absolute SANS cross sections and this allows quantitative results to be obtained; however, data collected at double-crystal diffractometers are frequently not normalized to absolute cross sections and they are used only for qualitative analysis. In point-geometry diffractometers, the normalization is done by comparing the scattered intensities to those of samples of known cross sections or by measuring the direct-beam intensity; in the double-crystal diffractometer, the incident flux information is contained in the rocking curve measured without a sample and this feature can therefore be used to normalize the scattered intensities to the SANS cross sections. A sample of thickness 1 mm of the Ni-based superalloy UDIMET 520 was analyzed at a double-crystal diffractometer; the SANS cross section obtained by the proposed procedure compares well with the SANS cross section found for similar materials by using conventional point-geometry diffractometers and calibrated by light water.
2
Roos, J. L. "Primary health care psychiatry". South African Journal of Psychiatry 14, n. 1 (1 marzo 2008): 1. http://dx.doi.org/10.4102/sajpsychiatry.v14i1.85.
Testo completoAbstract (sommario):
<div style="left: 73.788px; top: 351.428px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.886868);" data-canvas-width="406.22999999999996">Much needs to be done to improve psychiatric care in South</div><div style="left: 73.788px; top: 374.757px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.905417);" data-canvas-width="406.16999999999996">Africa. Resources need to be developed, particularly in rural</div><div style="left: 73.788px; top: 398.087px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.914111);" data-canvas-width="406.16999999999985">areas, and psychiatric services need to be better integrated</div><div style="left: 73.788px; top: 421.416px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.855137);" data-canvas-width="406.2899999999999">into primary health care services. This process will include the</div><div style="left: 73.788px; top: 444.746px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.905584);" data-canvas-width="406.24499999999995">intensive training of mental health care workers. If we look at the</div><div style="left: 73.788px; top: 468.075px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.893698);" data-canvas-width="406.27500000000015">training of primary care physicians, their rotation during the 2-year</div><div style="left: 73.788px; top: 491.405px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.9028);" data-canvas-width="406.21500000000003">internship falls short in psychiatry. It is not seen as a mainstream</div><div style="left: 73.788px; top: 514.734px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.886965);" data-canvas-width="406.21500000000015">rotation point like disciplines such as surgery or internal medicine.</div><div style="left: 73.788px; top: 538.064px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.921503);" data-canvas-width="406.26000000000005">This fact, as well as a more student-centred approach and</div><div style="left: 73.788px; top: 561.393px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.923528);" data-canvas-width="406.26">emphasis on self-learning in medical curricula, make the search</div><div style="left: 73.788px; top: 584.723px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.910728);" data-canvas-width="406.20000000000005">for an appropriate prescribed textbook in psychiatry an important</div><div style="left: 73.788px; top: 608.052px; font-size: 15.45px; font-family: sans-serif; transform: scaleX(0.845747);" data-canvas-width="34.14000000000001">issue.</div>
3
Romer, Sara, Claus Urban, Vladimir Lobaskin, Frank Scheffold, Anna Stradner, Joachim Kohlbrecher e Peter Schurtenberger. "Simultaneous light and small-angle neutron scattering on aggregating concentrated colloidal suspensions". Journal of Applied Crystallography 36, n. 1 (21 gennaio 2003): 1–6. http://dx.doi.org/10.1107/s0021889802016291.
Testo completoAbstract (sommario):
A new sample environment has been developed in order to perform light and small-angle neutron scattering (SANS) simultaneously on colloidal systems. The combination of SANS and diffusing wave spectroscopy (DWS) is of particular use in the high-concentration regime. DWS provides information on the local dynamic properties of the individual particles, whereas SANS gives access to the structural properties on similar length scales. The combination of both methods thus allows one to obtain structural and dynamic information over a very large range of length and time scales. Using this new setup, the onset of aggregation and the sol–gel transition in concentrated destabilized polystyrene sphere suspensions have been investigated. At the gel point, a dramatic change of the particle dynamics from diffusion to a subdiffusive arrested motion is observed. However, while the DWS measurements indicate that dramatic changes in the local dynamics occur over a long period, the SANS pattern quickly reaches its final appearance. The SANS experiments thus indicate that a fluid-like structure is arrested in the course of the gel formation. The data are found to be in good qualitative agreement with computer simulations.
4
HOBBIE, E. K., G. MERKLE, B. J. BAUER e C. C. HAN. "SPINODAL DECOMPOSITION IN HYDROGEN-BONDED POLYMER BLENDS". Modern Physics Letters B 10, n. 25 (30 ottobre 1996): 1219–26. http://dx.doi.org/10.1142/s0217984996001383.
Testo completoAbstract (sommario):
Time-resolved small-angle neutron-scattering (SANS) studies of spinodal decomposition in hydrogen-bonded blends of polystyrene and poly(butylmethacrylate) reveal extremely slow kinetics of phase separation in the vicinity of the critical point. The experimental data are interpreted within the context of a mean-field model that predicts energetic barriers to extended composition fluctuations. The scenario bears a resemblance to dynamic critical phenomena in Ising systems with coupling to a set of mobile impurities.
5
Dewhurst, C. D., e I. Grillo. "Neutron imaging using a conventional small-angle neutron scattering instrument". Journal of Applied Crystallography 49, n. 3 (12 aprile 2016): 736–42. http://dx.doi.org/10.1107/s1600576716003940.
Testo completoAbstract (sommario):
Neutron imaging has enjoyed a flurry of activity and application in recent years. The construction of dedicated beamlines at various neutron sources has demonstrated the significant interest among the science and engineering communities, with particular relevance to industrial applications, the nondestructive testing of components and imaging of precious archaeological artefacts. Here two methods are demonstrated of how neutron imaging can be performed using a conventional small-angle neutron scattering (SANS) instrument, such as D33 at the Institut Laue–Langevin, with spatial resolutions down to about 100 µm. The first is a magnified imaging technique from a quasi-point-like source with the magnified image recorded on the usual low-resolution SANS detector. The second method uses a fine beam in a raster-scan measurement over the area of interest. Images can be reconstructed either using the transmitted beam, as in conventional radiographic imaging, or from scattering data, giving access to transmission radiographic images as well as the dark-field or scattering contrasts and phase-contrast images.
6
Balbi, J. H., P. A. Santoni e J. L. Dupuy. "Dynamic modelling of fire spread across a fuel bed". International Journal of Wildland Fire 9, n. 4 (1999): 275. http://dx.doi.org/10.1071/wf00005.
Testo completoAbstract (sommario):
The analysis of laboratory fire experiments led to the development of a reaction-diffusion model for the spread of fire across a fuel bed in windless and slopeless conditions. A method for the determination of coefficients in this model based on the dynamic features of a spreading fire is given. The numerical study of the mathematical problem proposed allows us to predict the rate of spread, the fire front perimeter and the temperature distribution for line-ignition and point-ignition fires. These results are compared with success to experimental data. Furthermore, the model allows us to estimate the acceleration of spread for a point-ignition fire in its initial stage and in the steady-state phase. Résumé Une analyse menée sur des expériences de laboratoires nous a permis de proposer un modèle de réaction-diffussion pour la propagation du feu sans vent et sans pente au travers d’une litière. Une méthode d’identification des coefficients du modèle, à partir des caractéristiques dynamiques de la propagation du feu, est donnée. L’étude numérique du problème mathématique nous permet de prédire la vitesse de propagation, le périmètre du front de feu et la température dans le domaine d’étude pour des allumages en ligne et pour des allumages ponctuels. Ces résultats sont comparés avec succés à des données expérimentales. De plus, nous sommes aussi en mesure de décrire l’accélération du front de feu dans les premiers instants suivant un allumage ponctuel.
7
Koizumi, Satoshi, Satoru Ueda, Takumi Inada, Yohei Noda e Robert A. Robinson. "Microstructure and water distribution in catalysts for polymer electrolyte fuel cells, elucidated by contrast variation small-angle neutron scattering". Journal of Applied Crystallography 52, n. 4 (22 luglio 2019): 791–99. http://dx.doi.org/10.1107/s1600576719008343.
Testo completoAbstract (sommario):
By using small-angle neutron scattering (SANS) reinforced by scanning electron microscopy, the fine structure of catalysts for polymer electrolyte fuel cells has been investigated. The experimental data resulting from contrast variation with mixed light and heavy water (H2O/D2O) are well described by a core–shell model with fluctuations in concentration between water and Nafion. In particular, SANS obtained with the mixed water ratio 30/70, which corresponds to a matching point between mixed water and Nafion, shows a broad scattering maximum, which is attributed to a 5 nm-thick Nafion shell on the surface of the larger carbon particles. After swelling by water, the ionomer layer absorbs water at the 17 wt% level. By changing the H2O/D2O ratio, it was further confirmed that the catalyst with the ionomer exhibits water repellence, whereas the bare catalyst without the ionomer is wetted by water. Because it is very difficult to extract more information, for instance regarding the Pt–Nafion interactions, by means of small-angle scattering, reflectometry and grazing-incidence scattering experiments with neutrons should be attempted on a model catalyst prepared on a flat substrate.
8
Kim, Man-Ho, Jeong-Mann Doh, Seong Chul Han, Keun Hwa Chae, Byung-Yong Yu, Kyung Tae Hong, Andrew Jackson e Lawrence M. Anovitz. "The pore wall structure of porous semi-crystalline anatase TiO2". Journal of Applied Crystallography 44, n. 6 (4 ottobre 2011): 1238–45. http://dx.doi.org/10.1107/s0021889811037447.
Testo completoAbstract (sommario):
The structure of porous TiO2prepared by electrochemical anodization in a fluoride-containing ethylene glycol electrolyte solution was quantitatively studied using small-angle neutron scattering (SANS) and ultra-small-angle neutron scattering (USANS). The cylindrical pores along the coaxial direction were somewhat irregular in shape, were widely distributed in diameter, and seemed to have a broadly pseudo-hexagonal arrangement. The scattering from the pore wall showed a negative deviation from Porod scattering, indicating that the interface between TiO2and the pore was not sharp. A density gradient of around 40–60 Å at the pore wall (i.e.the interface between the pore and the TiO2matrix) was estimated using both constant and semi-sigmoidal interface models. This gradient may be due to the presence of fluorine and carbon partially absorbed by the pore wall from the fluoride-containing electrolyte or to sorbed water molecules on the wall. The neutron contrast-matching point between the TiO2matrix and the pores filled with liquid H2O/D2O mixtures was 51/49%(v/v) H2O/D2O, yielding an estimated mass density of 3.32 g cm−3. The specific surface area of the sample derived from the (U)SANS data was around 939–1003 m2 cm−3(283–302 m2 g−1).
9
Anovitz, Lawrence Michael, David Robert Cole, Julia Meyer Sheets, Alexander Swift, Harold William Elston, Susan Welch, Steve James Chipera, Kenneth Charles Littrell, David Francis Raymond Mildner e Matthew John Wasbrough. "Effects of maturation on multiscale (nanometer to millimeter) porosity in the Eagle Ford Shale". Interpretation 3, n. 3 (1 agosto 2015): SU59—SU70. http://dx.doi.org/10.1190/int-2014-0280.1.
Testo completoAbstract (sommario):
Porosity and permeability are key variables that link the thermal-hydrologic, geomechanical, and geochemical behavior in rock systems and are thus important input parameters for transport models. Neutron scattering studies indicate that the scales of pore sizes in rocks extend over many orders of magnitude from nanometer-sized pores with huge amounts of total surface area to large open fracture systems (multiscale porosity). However, despite considerable efforts combining conventional petrophysics, neutron scattering, and electron microscopy, the quantitative nature of this porosity in tight gas shales, especially at smaller scales and over larger rock volumes, remains largely unknown. Nor is it well understood how pore networks are affected by regional variation in rock composition and properties, thermal changes across the oil window (maturity), and, most critically, hydraulic fracturing. To improve this understanding, we have used a combination of small- and ultrasmall-angle neutron scattering (U)SANS with scanning electron microscope (SEM)/backscattered electron imaging to analyze the pore structure of clay- and carbonate-rich samples of the Eagle Ford Shale. This formation is hydrocarbon rich, straddles the oil window, and is one of the most actively drilled oil and gas targets in the United States. Several important trends in the Eagle Ford rock pore structure have been identified using our approach. The (U)SANS results reflected the connected (effective) and unconnected porosity, as well as the volume occupied by organic material. The latter could be separated using total organic carbon data and, at all maturities, constituted a significant fraction of the apparent porosity. At lower maturities, the pore structure was strongly anisotropic. However, this decreased with increasing maturity, eventually disappearing entirely for carbonate-rich samples. In clay- and carbonate-rich samples, a significant reduction in total porosity occurred at (U)SANS scales, much of it during initial increases in maturity. This apparently contradicted SEM observations that showed increases in intraorganic porosity with increasing maturity. Organic-rich shales are, however, a very complex material from the point of view of scattering studies, and a more detailed analysis is needed to better understand these observations.
10
Taufiq, Ahmad, Sunaryono, Nurul Hidayat, Arif Hidayat, Edy Giri Rachman Putra, Atsushi Okazawa, Isao Watanabe, Norimichi Kojima, Suminar Pratapa e Darminto. "Studies on Nanostructure and Magnetic Behaviors of Mn-Doped Black Iron Oxide Magnetic Fluids Synthesized from Iron Sand". Nano 12, n. 09 (settembre 2017): 1750110. http://dx.doi.org/10.1142/s1793292017501107.
Testo completoAbstract (sommario):
Manganese (Mn)-doped black iron oxide (Fe3O4) magnetic fluids in the system of MnxFe[Formula: see text]O4 were successfully synthesized from natural magnetite (iron sand) by using co-precipitation method at room temperature. The analyses of the small angle neutron scattering (SANS) data by applying a log-normal sphere with a mass fractal models for [Formula: see text] and [Formula: see text] and two log-normal spheres with a single mass fractal models for [Formula: see text], 0.75 and 1 revealed that the primary particles of the MnxFe[Formula: see text]O4 fluids tended to decrease from 3.8[Formula: see text]nm to 1.5[Formula: see text]nm along with the increasing fraction of Mn contents. The fractal dimension ([Formula: see text]) increased from about 1.2 to 2.7 as the Mn contents were increasing; which physically represents an aggregation of the MnxFe[Formula: see text]O4 particles in the fluids growing up from 1 to 3 dimensions to consolidate a more compact structure. The magnetization curves of the fluids exhibited an increasing saturation magnetization from [Formula: see text] to [Formula: see text], and a decreasing on [Formula: see text] and 0.75, with the maximum achievement of [Formula: see text]. These phenomena may probably be due to the combined effects, arising from cationic and dopant distributions, aggregation and its size, and also fractal dimension. Furthermore, the decrease of blocking temperature of the MnxFe[Formula: see text]O4 magnetic fluids could be associated with the reduced particle sizes, while the freezing temperature had its highest peak intensity when it collectively occurred with the blocking temperature at a similar point of about 270[Formula: see text]K.
Tesi sul tema "SANS data point"
1
Orire, Endurance. "The techno-economics of bitumen recovery from oil and tar sands as a complement to oil exploration in Nigeria / E. Orire". Thesis, North-West University, 2009. http://hdl.handle.net/10394/5704.
Testo completoAbstract (sommario):
The Nigeria economy is wholly dependent on revenue from oil. However, bitumen has been discovered in
the country since 1903 and has remained untapped over the years. The need for the country to
complement oil exploration with the huge bitumen deposit cannot be overemphasized. This will help to
improve the country's gross domestic product (GDP) and revenue available to government. Bitumen is
classifled as heavy crude with API (American petroleum Institute) number ranging between 50 and 110
and occurs in Nigeria, Canada, Saudi Arabia, Venezuela etc from which petroleum products could be
derived.
This dissertation looked at the Canadian experience by comparing the oil and tar sand deposit found in Canada with particular reference to Athabasca (Grosmont, Wabiskaw McMurray and Nsiku) with
that in Nigeria with a view of transferring process technology from Canada to Nigeria. The Nigeria and Athabasca tar sands occur in the same type of environment. These are the deltaic, fluvial marine deposit in an incised valley with similar reservoir, chemical and physical properties. However, the Nigeria tar sand is more asphaltenic and also contains more resin and as such will yield more product volume during
hydro cracking albeit more acidic. The differences in the components (viscosity, resin and asphaltenes
contents, sulphur and heavy metal contents) of the tar sands is within the limit of technology adaptation.
Any of the technologies used in Athabasca, Canada is adaptable to Nigeria according to the findings of this research.
The techno-economics of some of the process technologies are. x-rayed using the PTAC (petroleum
technology alliance Canada) technology recovery model in order to obtain their unit cost for Nigeria
bitumen. The unit cost of processed bitumen adopting steam assisted gravity drainage (SAGD), in situ
combustion (ISC) and cyclic steam stimulation (CSS) process technology is 40.59, 25.00 and 44.14
Canadian dollars respectively. The unit cost in Canada using the same process technology is 57.27, 25.00
and 61.33 Canadian dollars respectively. The unit cost in Nigeria is substantively lesser than in Canada.
A trade off is thereafter done using life cycle costing so as to select the best process technology for the
Nigeria oil/tar sands. The net present value/internal rate of return is found to be B$3,062/36.35% for
steam assisted gravity drainage, B$I,570124.51 % for cyclic steam stimulation and B$3,503/39.64% for in
situ combustion. Though in situ combustion returned the highest net present value and internal rate of
return, it proved not to be the best option for Nigeria due to environmental concern and response time to
production. The best viable option for the Nigeria tar sand was then deemed to be steam assisted gravity
drainage.
An integrated oil strategy coupled with cogeneration using MSAR was also seen to considerably amplify
the benefits accruable from bitumen exploration; therefore, an investment in bitumen exploration in
Nigeria is a wise economic decision.Thesis (M.Ing. (Development and Management))--North-West University, Potchefstroom Campus, 2010.
2
Fenollosa, Artés Felip. "Contribució a l'estudi de la impressió 3D per a la fabricació de models per facilitar l'assaig d'operacions quirúrgiques de tumors". Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667421.
Testo completoAbstract (sommario):
La present tesi doctoral s’ha centrat en el repte d’aconseguir, mitjançant Fabricació Additiva (FA), models per a assaig quirúrgic, sota la premissa que els equips per fer-los haurien de ser accessibles a l’àmbit hospitalari. L’objectiu és facilitar l’extensió de l’ús dels prototips com a eina de preparació d’operacions quirúrgiques, transformant la pràctica mèdica actual de la mateixa manera que en el seu moment ho van fer tecnologies com les que van facilitar l’ús de radiografies. El motiu d’utilitzar FA, en lloc de tecnologies més tradicionals, és la seva capacitat de materialitzar de forma directa les dades digitals obtingudes de l’anatomia del pacient mitjançant sistemes d’escanejat tridimensional, fent possible l’obtenció de models personalitzats. Els resultats es centren en la generació de nou coneixement sobre com aconseguir equipaments d’impressió 3D multimaterials accessibles que permetin l’obtenció de models mimètics respecte als teixits vius. Per facilitar aquesta buscada extensió de la tecnologia, s’ha focalitzat en les tecnologies de codi obert com la Fabricació per Filament Fos (FFF) i similars basades en líquids catalitzables. La recerca s’alinea dins l’activitat de desenvolupament de la FA al CIM UPC, i en aquest àmbit concret amb la col·laboració amb l’Hospital Sant Joan de Déu de Barcelona (HSJD). El primer bloc de la tesi inclou la descripció de l’estat de l’art, detallant les tecnologies existents i la seva aplicació a l’entorn mèdic. S’han establert per primer cop unes bases de caracterització dels teixits vius -sobretot tous- per donar suport a la selecció de materials que els puguin mimetitzar en un procés de FA, a efectes de millorar l’experiència d’assaig dels cirurgians. El caràcter rígid dels materials majoritàriament usats en impressió 3D els fa poc útils per simular tumors i altres referències anatòmiques. De forma successiva, es tracten paràmetres com la densitat, la viscoelasticitat, la caracterització dels materials tous a la indústria, l’estudi del mòdul elàstic de teixits tous i vasos, la duresa d’aquests, i requeriments com l’esterilització dels models. El segon bloc comença explorant la impressió 3D mitjançant FFF. Es classifiquen les variants del procés des del punt de vista de la multimaterialitat, essencial per fer models d’assaig quirúrgic, diferenciant entre solucions multibroquet i de barreja al capçal. S’ha inclòs l’estudi de materials (filaments i líquids) que serien més útils per mimetitzar teixits tous. Es constata com en els líquids, en comparació amb els filaments, la complexitat del treball en processos de FA és més elevada, i es determinen formes d’imprimir materials molt tous. Per acabar, s’exposen sis casos reals de col·laboració amb l’HJSD, una selecció d’aquells en els que el doctorand ha intervingut en els darrers anys. L’origen es troba en la dificultat de l’abordatge d’operacions de resecció de tumors infantils com el neuroblastoma, i a la iniciativa del Dr. Lucas Krauel. Finalment, el Bloc 3 té per objecte explorar nombrosos conceptes (fins a 8), activitat completada al llarg dels darrers cinc anys amb el suport dels mitjans del CIM UPC i de l’activitat associada a treballs finals d’estudis d’estudiants de la UPC, arribant-se a materialitzar equipaments experimentals per validar-los. La recerca ampla i sistemàtica al respecte fa que s’estigui més a prop de disposar d’una solució d’impressió 3D multimaterial de sobretaula. Es determina que la millor via de progrés és la de disposar d’una pluralitat de capçals independents a fi de capacitar la impressora 3D per integrar diversos conceptes estudiats, materialitzant-se una possible solució. Cloent la tesi, es planteja com seria un equipament d’impressió 3D per a models d’assaig quirúrgic, a fi de servir de base per a futurs desenvolupaments.La presente tesis doctoral se ha centrado en el reto de conseguir, mediante Fabricación Aditiva (FA), modelos para ensayo quirúrgico, bajo la premisa que los equipos para obtenerlos tendrían que ser accesibles al ámbito hospitalario. El objetivo es facilitar la extensión del uso de modelos como herramienta de preparación de operaciones quirúrgicas, transformando la práctica médica actual de la misma manera que, en su momento, lo hicieron tecnologías como las que facilitaron el uso de radiografías. El motivo de utilizar FA, en lugar de tecnologías más tradicionales, es su capacidad de materializar de forma directa los datos digitales obtenidos de la anatomía del paciente mediante sistemas de escaneado tridimensional, haciendo posible la obtención de modelos personalizados. Los resultados se centran en la generación de nuevo conocimiento para conseguir equipamientos de impresión 3D multimateriales accesibles que permitan la obtención de modelos miméticos respecto a los tejidos vivos. Para facilitar la buscada extensión de la tecnología, se ha focalizado en las tecnologías de código abierto como la Fabricación por Hilo Fundido (FFF) y similares basadas en líquidos catalizables. Esta investigación se alinea dentro de la actividad de desarrollo de la FA en el CIM UPC, y en este ámbito concreto con la colaboración con el Hospital Sant Joan de Déu de Barcelona (HSJD). El primer bloque de la tesis incluye la descripción del estado del arte, detallando las tecnologías existentes y su aplicación al entorno médico. Se han establecido por primera vez unas bases de caracterización de los tejidos vivos – principalmente blandos – para dar apoyo a la selección de materiales que los puedan mimetizar en un proceso de FA, a efectos de mejorar la experiencia de ensayo de los cirujanos. El carácter rígido de los materiales mayoritariamente usados en impresión 3D los hace poco útiles para simular tumores y otras referencias anatómicas. De forma sucesiva, se tratan parámetros como la densidad, la viscoelasticidad, la caracterización de materiales blandos en la industria, el estudio del módulo elástico de tejidos blandos y vasos, la dureza de los mismos, y requerimientos como la esterilización de los modelos. El segundo bloque empieza explorando la impresión 3D mediante FFF. Se clasifican las variantes del proceso desde el punto de vista de la multimaterialidad, esencial para hacer modelos de ensayo quirúrgico, diferenciando entre soluciones multiboquilla y de mezcla en el cabezal. Se ha incluido el estudio de materiales (filamentos y líquidos) que serían más útiles para mimetizar tejidos blandos. Se constata como en los líquidos, en comparación con los filamentos, la complejidad del trabajo en procesos de FA es más elevada, y se determinan formas de imprimir materiales muy blandos. Para acabar, se exponen seis casos reales de colaboración con el HJSD, una selección de aquellos en los que el doctorando ha intervenido en los últimos años. El origen se encuentra en la dificultad del abordaje de operaciones de resección de tumores infantiles como el neuroblastoma, y en la iniciativa del Dr. Lucas Krauel. Finalmente, el Bloque 3 desarrolla numerosos conceptos (hasta 8), actividad completada a lo largo de los últimos cinco años con el apoyo de los medios del CIM UPC y de la actividad asociada a trabajos finales de estudios de estudiantes de la UPC, llegándose a materializar equipamientos experimentales para validarlos. La investigación amplia y sistemática al respecto hace que se esté más cerca de disponer de una solución de impresión 3D multimaterial de sobremesa. Se determina que la mejor vía de progreso es la de disponer de una pluralidad de cabezales independientes, a fin de capacitar la impresora 3D para integrar diversos conceptos estudiados, materializándose una posible solución. Para cerrar la tesis, se plantea cómo sería un equipamiento de impresión 3D para modelos de ensayo quirúrgico, a fin de servir de base para futuros desarrollos.
3
Sullivan, John. "The practical application of Vectar Processed densities in proving the lateral continuity of coal Zones and Samples in the Ellisras Basin, South Africa in support of effective Mineral Resource adjudication". Thesis, 2014. http://hdl.handle.net/2263/43256.
Testo completoAbstract (sommario):
The Ellisras Basin, with huge coal resources, is fault-bounded along its southern and northern margins and is a graben-type deposit. The study area is situated in the south-western part of the Limpopo Province of the Republic of South Africa and is geologically located in the Ellisras Basin. In this area the basin is influenced by three major fault zones, the Eenzaamheid Fault delineating its southern limit, the Zoetfontein Fault near its northern limit and the Daarby Fault, with a down-throw of approximately 350 m towards the north-east. Sedimentological facies changes also influence the continuity of the coal zones, with deterioration in coal development.
The exploration project was a collaboration between two of the large role players in the South African coal mining industry Sasol and Exxaro, for the purpose of identifying whether the coal in the Ellisras Basin could be used for gasification purposes in the Sasol process, and that enough resources exist on the farms on which the two companies have the exploration rights.. The prospecting method used at the Project area, situated 50 kilometer west of the town of Lephalale in the Limpopo Province of South Africa, comprises the drilling of cored exploration boreholes on a random spacing of ± 1 000 m x 1 000 m, together with infill percussion drilling.
The use of slimline geophysical methods to log lithologies is a technique which has been used extensively in the mining industry over a number of years. At the Project area the correlation between the measured densities derived from the traditional method of air and water measurement and those derived from Vectar processed derived densities from geophysical logging is better than 95%. As a method of “fingerprinting” the various coal zones and samples it was decided to calculate the distribution of relative densities in the chosen geological intersection. The data was then used to portray geophysically derived relative density cumulative distribution line diagrams (GDCDD) of the various lithotypes on either a sample-by-sample or zone-by-zone basis.
Using the classification method proposed, the various coal seams and zones can be correlated to a high degree and discrepancies easily identified. The lateral correlation between lithologies can be accurately described and substantiated, and this would convince a Competent Person that the method proposed is invaluable in classifying coal resources in the coal basins.Thesis (PhD)--University of Pretoria, 2014.
lk2014
Geology
PhD
Unrestricted
Libri sul tema "SANS data point"
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Taylor, Lisa A. Digital elevation models of Sand Point, Alaska: Procedures, data sources and analysis. Boulder, Colo: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service, National Geophysical Data Center, 2008.
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Hagerman, James R. Sand Mountain/Guntersville Reservoir aerial inventory of land uses and nonpoint pollution sources data report. Chattanooga, Tenn: Tennessee Valley Authority, River Basin Operations, Water Resources, 1990.
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Smoothing point data into maps using SAS/GRAPH software. [Ogden, UT]: U.S. Dept. of Agriculture, Forest Service, Intermountain Research Station, 1996.
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Chandler, Daniel, e Rod Munday. A Dictionary of Media and Communication. Oxford University Press, 2020. http://dx.doi.org/10.1093/acref/9780198841838.001.0001.
Testo completoAbstract (sommario):
Over 3,600 entries ‘…not only a dictionary of communication and media but also a liberal education that enables users to see interesting relationships between many of the concepts it discusses.’ Professor Arthur Asa Berger, San Francisco State University This authoritative and up-to-date A–Z offers points of connection between communication and media and covers all aspects of interpersonal, mass, and networked communication, including digital and mobile media, advertising, journalism, social media, and nonverbal communication. In this new edition, over 2,000 entries have been revised and more than 500 have been newly added to include current terminology and concepts such as artificial intelligence, cisgender, fake news, hive mind, use theory, and wikiality. It bridges the gap between theory and practice and contains many technical terms that are relevant to the communication industry, including dialogue editing, news aggregator and primary colour correction. Additional material includes a biographical notes appendix, and entries are complemented by approved web links which guide further reading. This is an indispensable guide for undergraduate students of media and communication studies and also for those taking related subjects such as television studies, video production, communication design, visual communication, marketing communications, semiotics, and cultural studies.
Capitoli di libri sul tema "SANS data point"
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Anonymous. "Long Beach to Borrego Springs: Signal Hill-Dana Point-Lake Elsinore-Salton Trough". In The San Andreas Transform Belt: Long Beach to San Francisco, California July 20–29, 1989, 52–58. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft309p0052.
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Smith, Molly E., Donna Selch e Caiyun Zhang. "Applying Point Spectroscopy Data to Characterize Sand Properties". In Multi-sensor System Applications in the Everglades Ecosystem, 195–210. CRC Press, 2020. http://dx.doi.org/10.1201/9780429075872-11.
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"Early Life History of Fishes in the San Francisco Estuary and Watershed". In Early Life History of Fishes in the San Francisco Estuary and Watershed, a cura di Heather M. Brown, Frederick J. Griffin, Eric J. Larson e Gary N. Cherr. American Fisheries Society, 2004. http://dx.doi.org/10.47886/9781888569599.ch1.
Testo completoAbstract (sommario):
<em>Abstract.</em>—San Francisco Bay provides spawning and rearing habitat for California’s largest population of Pacific herring <em>Clupea pallasi</em>. This population provides a food source for other species and supports a valuable fishery for Pacific herring roe. Since the inception of the roe fishery in 1973, the California Department of Fish and Game has conducted annual surveys of spawning in San Francisco Bay as part of an ongoing assessment of population status and management of the fishery. The purpose of this paper is to document (1) regions of San Francisco Bay used by Pacific herring as spawning grounds over time, and (2) time periods in which spawning took place. Spawn data were analyzed by geographic region in the bay and by month for the period 1973–2000. During this period, we documented 269 spawning events from Point San Pablo south to Redwood City. Estimates of spawning adult biomass (fish that were not harvested by the fishery) ranged from 80,813 metric tons in 1981–1982 to 3,199 metric tons in 1997– 1998 (mean = 34,688 ± 19,325 SD). January was the peak spawning month, followed by December and February; small variations in this pattern occurred during some years. Overall, the majority of spawning took place in the north-central bay region (Point Bonita to Richmond-San Rafael Bridge, Angel Island, Point San Pablo, Berkeley flats; 55%) and the San Francisco region (Golden Gate Bridge to Candlestick Point; 34%), although it alternated between these two regions over time. In some years, considerable spawning took place in the Oakland–Alameda region (San Francisco–Oakland Bay Bridge to Bay Farm Island). The largest spawns and peak periods of spawning may not contribute most toward the next generation of Pacific herring, due to differential mortality within the season. For this reason, all regions documented in this study are important spawning grounds for Pacific herring from November through March each year. A number of recent studies have furthered our understanding of Pacific herring early life history and the forces that drive year-class formation in San Francisco Bay. However, studies are especially needed that will improve our ability to adequately address the potential impacts of human activities on Pacific herring in this highly urbanized estuary.
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Falcolini, Corrado. "Algorithms for Geometrical Models in Borromini's San Carlino alle Quattro Fontane". In Advances in Media, Entertainment, and the Arts, 642–65. IGI Global, 2016. http://dx.doi.org/10.4018/978-1-5225-0029-2.ch026.
Testo completoAbstract (sommario):
Construction of mathematical models of the vault of Borromini's San Carlino alle Quattro Fontane based on parametric curves and surfaces, including the shape of the vault and rules for its tessellation with crosses and octagonal coffers. Several models of different complexity are optimized and tested measuring their distance from the point cloud of a very accurate 3D survey and the analysis of such measured data is proposed to validate hypothesis of construction procedures by checking symmetries of coffers shape, scale and position in different levels and sectors. Some original algorithms are discussed to produce regular tessellations on a surface with a generic base curve and to construct regular parametric curves section out of simple point cloud data.
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Elicegui, Javier Martínez, Lei Xu e Emilio García Escobar. "Business Models and Billing Challenges". In Data Intensive Storage Services for Cloud Environments, 47–59. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-3934-8.ch004.
Testo completoAbstract (sommario):
The advent of the Cloud has leveraged a number of challenges, both for customers and service providers. Companies willing to embrace the new paradigm must face some entrance barriers, such as security, privacy and trust concerns, vendor locking risk, legal issues, etc. While service providers may work to minimize these barriers, they must be especially careful when defining what may constitute the most crucial aspect for the success of their offerings: the business model. Different incarnations of the cloud (IaaS, PaaS, and SaaS) add to the possibility of offering public or private solutions, or even federated models. On top of this is the billing strategy: the ubiquitous pay-per-use approach (either in its most common post-paid incarnation, or in a novel pre-paid version) is only the starting point for a wide range of innovative solutions, including bundling or QoS considerations, which European project VISION Cloud is tackling as part of its research efforts. This chapter aims to provide a comprehensive discussion on the most relevant business factors that the Cloud confronts.
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Viswanath, Navin, e Rajshekhar Sunderraman. "A Paraconsistent Relational Data Model". In Handbook of Research on Innovations in Database Technologies and Applications, 18–27. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-242-8.ch003.
Testo completoAbstract (sommario):
Typically, relational databases operate under the Closed World Assumption (CWA) of Reiter (Reiter, 1987). The CWA is a meta-rule that says that given a knowledge base KB and a sentence P, if P is not a logical consequence of KB, assume ~P (the negation of P). Thus, we explicitly represent only positive facts in a knowledge base. A negative fact is implicit if its positive counterpart is not present. Under the CWA we presume that our knowledge about the world is complete i.e. there are no “gaps” in our knowledge of the real world. The Open World Assumption (OWA) is the opposite point of view. Here, we “admit” that our knowledge of the real world is incomplete. Thus we store everything we know about the world – positive and negative. Consider a database which simply contains the information “Tweety is a bird”. Assume that we want to ask this database the query “Does Tweety fly?”. Under the CWA, since we assume that there are no gaps in our knowledge, every query returns a yes/no answer. In this case we get the answer “no” because there is no information in the database stating that Tweety can fly. However, under the OWA, the answer to the query is “unknown”. i.e. the database does not know whether Tweety flies or not. We would obtain a “no” answer to this query under the OWA only if it was explicitly stated in the database that Tweety does not fly.
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Durak, Saliha, Hande Eda Sutova, Abuzer Alp Yetisgin, Ozlem Kutlu e Sibel Cetinel. "Potency of SARS-CoV-2 on Ocular Tissues". In Eye Infections - Recent Advances in Diagnosis and Treatment [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97055.
Testo completoAbstract (sommario):
The current COVID-19 pandemic has affected more than 100 million people and resulted in morbidity and mortality around the world. Even though the disease caused by SARS-CoV-2 is characterized by respiratory tract involvement, previous and recent data also indicates ocular manifestation. Not surprisingly, cell entry point of the virus, ACE2 receptor, is widely expressed in ocular tissues ranging from conjunctiva to retina. Despite the sensibility of ocular tissues, the sophisticated defense mechanism of the eye might eliminate viral transmission. Nevertheless, the potential of systemic transmission through the nasolacrimal duct may not be eliminated. In the case of ocular involvement, the disease outcomes might be as treatable as conjunctivitis or as serious as retinal degeneration and the treatment regimen vary accordingly. Within these contingencies, our aim with this chapter is to shed light on molecular bases of SARS-CoV-2 infection, systemic invasiveness following ocular transmission, manifestation and permanent effects on ocular tissues.
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"IkeWYSe". In A Simplex Approach to Learning, Cognition, and Spatial Navigation, 39–52. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2455-7.ch005.
Testo completoAbstract (sommario):
The first product of the project presented here was a prototype of video games, named IKeWYSE, which constituted the data collection tool for the experimental research project. The videogame prototype realized requires the user to navigate in a three-dimensional space through an avatar. User deals with three different tasks, two of which are designed to measure the skills of perspective taking, while the third task is calibrated on the ability of mental rotation. The default point of view is a semi-subjective view with the camera following the avatar. The player has the option to select other views, going through semi-subjective, subjective and objective point of view. The game was tested between January and March 2015, with a group of 70 children, 35 males and 35 females, from the third, fourth and fifth primary school class and from a first secondary school class of the Istituto Comprensivo San Valentino Torio, in the province of Salerno. Each user performs 10 attempts for each task. The software records the beginning of each game, the user data (age and gender), and, during the game, time for each attempt and the result (success / failure) of the attempt. The present chapter presents the research design, the path for design and development of the videogame, the methods for data collection and discusses the results obtained.
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Mohanasundaram, R., A. Jayanthiladevi e Keerthana G. "Software-Defined Cloud Infrastructure". In Handbook of Research on Cloud and Fog Computing Infrastructures for Data Science, 108–23. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-5972-6.ch006.
Testo completoAbstract (sommario):
Cloud computing suggests that the applications conveyed as services over the internet and frameworks programming in the server that give various services and offers in “pay as you go” trend which means pay only for what you use. The information and services are managed as software as a service (SaaS). Some sellers utilize terms, for example, IaaS (infrastructure as a service) and PaaS (platform as a service). The purpose of cloud computing is quickly expanding in everyday life. Today the use of cloud computing is widespread to the point that it is being utilized even in the medicinal services industry. As the development of cloud computing in healthcare is happening at a fast rate, we can expect a noteworthy piece of the healthcare administrations to move onto the Cloud and along these lines more focus is laid on giving cost-effective and efficient services to the general population all around the world. Cloud these days are turning into the new building pieces of significant organizations spread the world over. They offer assistance in servicing to offer different frameworks. Cloud computing has enhanced its technique and technologies in a better way to provide better services. Existing e-healthcare has many difficulties from advancement to usage. In this chapter, the authors discuss how cloud computing is utilized and the services provided by the Cloud and their models and its infrastructure.
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Sato, Maria Ines Zanoli. "History of Infectious Diseases". In Healthcare Policy and Reform, 1–18. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-6915-2.ch001.
Testo completoAbstract (sommario):
This chapter provides a review of infectious disease to date and the challenges they may present in the future. The main pandemics that have driven the history of humanity are described, from the first to be recorded in 3180 BC to more recent ones such as AIDIS, SARS and others associated with emerging pathogens. The essential role of emerging scientific specialisms (particularly microbiology, public health and sanitary engineering) to our understanding of the causes of these diseases (and how they may be better monitored, controlled and prevented) is presented. Globalization and climate change, determining factors for the ecology of infectious diseases and their emergence and re-emergence, are discussed and point to the urgent need for research to deal with these threats that continue to have a significant impact on human development and wellbeing.
Atti di convegni sul tema "SANS data point"
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Donald A., Anschutz, Wildt Patrick J., Stribling K. Michelle, Craig Jim, Curimbaba Luiz R., Silva Pedro e Abou-sayed Ibrahim S. "An Advanced Proppant Depositional Study with Post-Production Flow Evaluation in a 10' X 20', Transverse Fracture, Slot Flow Configuration". In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206212-ms.
Testo completoAbstract (sommario):
Abstract While the shale revolution flourished prior to the pandemic, the increased supply bubble had already taken a toll on the profitability of horizontal wells with multiple transverse fractures. A significant shift previously occurred to reduce proppant costs by utilizing cheaper, smaller grained, lower strength, and broadly diverse grain sized sands. Due to the extremely low matrix permeability in active unconventional plays, the use of regional 40/70 and 100 mesh sands (50/140, 70/140, etc.) has become commonplace with adequate results. What remains is the need for enhanced conductivity near the wellbore to handle the radial flow convergence loss when the well is brought on-line. Research is being conducted to better understand how to efficiently increase near-wellbore conductivity using lead and tail-in stages with higher permeability (ceramic) proppant when frac sand is the majority of the material pumped into the well. A 10’x20’ Large Slot Flow (LSF) apparatus, equipped with multiple injection points, side-panel ports for leak-off and/or post-test injection, with the ability to be disassembled for sample analysis after testing, was utilized for this project. For this data, the inlet was moved to the centerline of the wall to allow for proppant and fluid to transport into an environment similar to a horizontal wellbore connecting with a transverse fracture. Various tests were conducted to study the depositional characteristics of lead and tail-in stages with ceramic proppant (15% BW-Lead, 5% BW-Tail) and a main stage of 100 mesh sand (80%). Three inlet positions were established in the lower, middle, and upper portion of the apparatus. Tests were recorded to visually capture the efficiency of placing the premium proppants near the wellbore for increased conductivity. A key addition to the study was the innovative, post-production analysis through the side-panel ports. Fluid was injected into the proppant pack to observe the effect of increased near-wellbore conductivity. To improve visibility, the fluid was colored with a fluorescent dye and observed under black lights. The injection front geometry was radial initially, but typically elongated toward the exit point after contacting the ceramic proppant. The amount of time and distance for the fluid to travel through the sand pack, as well as that for the fluid to reach the offtake point once the ceramic bed was reached, were monitored and recorded. The ratio of the velocities should represent a valid qualitative indication of the conductivity contrast of the two proppants. This paper will describe the unique experimental configuration, outline the testing program for both deposition and post-production assessments performed on the deposits, along with results that could provide better design practices leading to improved transverse fracture performance.
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Goodall, Randal K., e Noel S. Poduje. "Data point selection for site qualification of wafers for ULSI lithography". In Microlithography '90, 4-9 Mar, San Jose, a cura di William H. Arnold. SPIE, 1990. http://dx.doi.org/10.1117/12.20051.
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Chen, Xiangyi, Björn Koppe, Martin Lange, Wuli Chu e Ronald Mailach. "Performance of Unsteady Reynolds-Averaged Navier-Stokes and Hybrid Scale-Resolving Simulation Approaches in Simulating a Low-Speed Axial Compressor Rotor". In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59028.
Testo completoAbstract (sommario):
Abstract Aerodynamics phenomena in compressors are highly unsteady and turbulent. Selecting a proper turbulence-modeling method is significant to reveal the complex flow mechanism in turbomachines. In the current paper, the shear stress transport (SST) model as an unsteady Reynolds-averaged Navier-Stokes (RANS) method, the scale-adaptive simulation (SAS) model, and the zonal wall-modeled large eddy simulation (zonal-LES) as two hybrid scale-resolving simulation approaches have been compared. These turbulence-modeling methods were employed to simulate a single rotor of a low-speed research compressor featuring a tip clearance of 1.3% of chord length. Comparisons were made between the simulation results and the experimental data at three operating points, and the flow fields at the design point have been specifically discussed in detail. The results show that the advantage of the zonal-LES model becomes obvious as the compressor throttles. The zonal-LES model brings a significant improvement over both the SST model and the SAS model in capturing the experimental data, especially the velocity distribution in the low-span region, as well as the loss near the endwalls. The SAS model as a scale-resolving method presents no benefits in predicting the relevant flow compared with the SST model, as the activation of the SAS source term is limited for this test case. For the loss prediction, the variation in the upper half-span region is mainly due to the different results in modeling turbulent characteristics of the tip leakage flow, whereas the mechanism behind the higher loss at the lower half-span predicted by the zonal-LES model is a consequence of the complex topology of the corner separation and the intensive mixing.
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Yu, Long, Yuxia Hu e Jun Liu. "Spudcan Penetration in Loose Sand Over Uniform Clay". In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79214.
Testo completoAbstract (sommario):
Punch through failures of spudcan foundations of mobile jack-up rigs have been reported every year. The potential of punch through failure of spudcan foundations on loose sand over uniform clay soils was studied numerically in the present paper. Large deformation finite element analyses were carried out to simulate the load-penetration responses of a 14m diameter spudcan during continuous penetration into this sand over clay soil. The numerical results were compared with existing centrifuge data. The critical penetration depths were derived from the load-penetration responses. The soil flow mechanisms, the shape of sand plug and the distribution of plastic points were also reported.
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Ambrose, Jonathan, Alex Mackie, John Yung Lee, Ovidiu Cristian Bibic, M. Shamir A. Rahim, Nik Zarina Nik Khansani e M. Hafiidz Hassan. "Design, Testing and Field Deployment of an Online Sand Sampling and Particle Size Analysis Package". In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21855-ms.
Testo completoAbstract (sommario):
Abstract Particle Size Analysis (PSA) of formation or produced sand is an important process in oil and gas exploration and production. This information is required to design downhole sand control, surface sand monitoring and removal systems, and to predict erosion in completion and production systems. A major operator in Malaysia required PSA data as well but found it a challenge as their wells, located offshore in Field Z, contain high amounts of contaminants such as TENORM, Mercury and Hydrogen Sulphide (H2S). Manually collecting produced sand samples was deemed too hazardous to people and the asset thus a closed loop Online Sand Sampling and PSA package was developed and deployed offshore. Samples were taken directly off flowline sample points, flowed through an online PSA system and continued its flow path to a closed loop drain line. The system therefore collected liquid, gas, and sand samples without any need for manual handling thereby eliminating exposure of harmful substances to personnel. A field laptop, running propriety software, connected via ethernet cable to the PSA system continuously measure and record the size of sand particles as they flow through the said system. This allowed the offshore execution team to view and record particle size data in real time. Data collated was available for further analysis onshore because the file format of the PSA software allows play back to refine particle images captured during the sampling operation. This was completed for 32 wells with the majority of the sampling providing good clear particle size information. Results were re-run and analysed again onshore by a sand management technical team from both the operator and service provider. The results were comparable to lab analysed samples of commonly used Laser Particle Size Analysis (LPSA). Therefore this first of its kind method provides a novel way for operaters to sample sand and solids in hazardous and also non hazardous environments.
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Lakatos, Istva´n, e Julianna Lakatos-Szabo´. "Potential of Conventional and Unconventional Hydrocarbons: Comparison of Resources, Reserves, Recovery Factors, and Technologies". In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-80157.
Testo completoAbstract (sommario):
The paper deals with the availability of natural hydrocarbons until 2100. Starting point of the evaluation is that the global demand will not be met by production of conventional oil and gas. Basis of the discussion is the comparison of available resources and reserves, recovery factors and technologies. The analysis comprised oil shale, tar sand, gas shale, tight sand gas, coalbed methane and gas hydrates. Taking the data of competent organizations into account, obviously the global resources of unconventional oil and gas significantly exceed the availability of conventional natural hydrocarbons in spite of the fact that their recovery efficiency is extremely low. Although the production cost (operation expenditure) of unconventional hydrocarbons is usually much higher than those of the conventional ones, industrial scale production of tar sand oil, tight sand gas and coalbed methane has started over two decades ago and their contribution to total oil and gas production is already substantial in several countries (US, Canada). The authors stated, however, that wider application of sophisticated technology to recover unconventional hydrocarbons needs more extensive and intensive R&D activity and further, new paradigms are necessary in education, research, production, field management, and governmental regulation.
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Narayan, Dr S. K. "Re-developing, Of Farm Athenaeum And Materialize Automation: Ultimatum And Occasion". In CONTEMPORARY SCIENTIFIC RESEARCH: CURRENT ISSUES, ACHIEVEMENTS AND INNOVATIONS. The USA Journals, 2020. http://dx.doi.org/10.37547/iscrc-intconf01-01.
Testo completoAbstract (sommario):
The conventional method of running library administrations in horticultural athenaeum is by all accounts over at this point. The principle explanations behind this is by all accounts the mix of negative development in financing, increment in costs of horticultural data assets and important interests in innovation, human asset improvement and expanding desire for the clients. Rural athenaeum of SAUs and ICAR organizations have encountered these issues during last 8-10 years. Working with less financing during these years have prompted the undoing of a portion of the farming assets.
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Klein, Mark, e Gray Simpson. "The Development of Innovative Methods for Erosion Testing a Russian Coating on GE T64 Gas Turbine Engine Compressor Blades". In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54336.
Testo completoAbstract (sommario):
The US Navy became aware of a Russian erosion-resistant compressor coating in 1991. The coating was being applied to compressor airfoils on the TV2-117 engine (MI-8 helicopter). Performance data obtained from the Russian coating company showed greatly improved erosion resistance, leading to better engine performance and longer time-on-wing. A proposal was sent to the Foreign Comparative Testing (FCT) office to evaluate the coating for US Navy engines operating in sandy environments. The project was approved and funded in 1997. It was determined that the high-speed erosion chamber at the University of Cincinnati would provide the optimum testing environment for the program. The test articles consisted of a bare blade and a coated blade. Testing conditions required 10 micron silica sand impinging upon the blades at 700 feet per second (fps). Data was collected until the bare blade reached the chord reject criteria. Testing continued until the coated blade reached failure as well. It was found that the coating improved the overall blade life by 300–500%. A method was developed to measure the eroded blades at certain points to determine the real or “effective” chord at any point during the testing. This project demonstrated the need for innovative gauging techniques in order to understand the actual effects of erosion on compressor blades.
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Booncharoen, Pichita, Thananya Rinsiri, Pakawat Paiboon, Supaporn Karnbanjob, Sonchawan Ackagosol, Prateep Chaiwan e Ouraiwan Sapsomboon. "Pore Pressure Estimation by Using Machine Learning Model". In International Petroleum Technology Conference. IPTC, 2021. http://dx.doi.org/10.2523/iptc-21490-ms.
Testo completoAbstract (sommario):
Abstract In the past few years, over hundreds of wells were drilled in Gulf of Thailand, had faced with the depletion and lost circulation issues resulted from a lack of pressure data. A prior research of reservoir depletion pressure (Fangming, 2009) in oil field, China was obtained from multivariate statistic and regression by using density and neutron porosity log curves in logging-while-drilling data. However, the relative errors are 7.5% from the actual formation pressure. Thus, there are several latent variables in the model like drilling parameters (Rehm, 1971) which part of formation pressure. From 2018 initiative model in Satun-Funan, the classification model was obtained by using mud gas, porosity, water saturation, net sand thickness, net-hydrocarbon-pore thickness and neutron-density separation. However, the limitation is drilling parameters could not account by classifier, and accurate only original pressure category. So, this study has expanded scope to include other reservoir properties and drilling parameters then applied with machine learning on offset well dataset by using three regressors such quantile, ridge and XGBoost regressors. The pore pressure estimation model aims to improve efficiency for making decision in execution phase, increasing confidence in perforation strategy. The model parameters, pay thickness, porosity, water saturation, original pressure from local pressure profile and total gas show are accounted into this model. As of regressor assumption, some facts are conducted to logarithm and perform 2nd polynomial feature for model flexibility. There are three steps for building model such as data manipulation, analysis and deployment. Two purposes of pressure prediction impact algorithm selection, for operational phase, quantile regressor is implemented to provide conservative prediction while Ridge or XGBoost regressors are alternatives for perforation strategy, provide mid case result of pressure prediction. Overall model performance was measured using root mean square error (RMSE) on train & test dataset which show approximately 1.2 and 1.5 ppg range of accuracy respectively from total 12 drilling projects in Pattani basin. Overall model fitting is within reasonable range of generalization capacity to apply with unknown data point (test set). The future model will continue to improve accuracy and manage imbalanced dataset between original pressure and depleted sands.
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Lee, Shih-Nien, e Tzu-Ching Weng. "Choice of Hospital Risk Management Strategy-Comparison between SARS and COVID-19". In Japan International Business and Management Research Conference. RSF Press & RESEARCH SYNERGY FOUNDATION, 2020. http://dx.doi.org/10.31098/jibm.v1i1.223.
Testo completoAbstract (sommario):
This study explored the methods for hospitals to take corresponding measures to implement response measures from the perspective of epidemic crisis management. Through the analysis of the practical experience of each hospital, the crisis situation, the countermeasures, and the review of the hospital's rehabilitation methods. The research method is a case study method. The main sources of research data are interviews, internal hospital file data, and related journal articles and media reports. Research results: 1. This research explored the organizational behavior of the hospital and the strategic emergency points that it showed in the face of crisis. 2. "Transformative" leadership style, with timely and application-oriented management. 3. The implementation of epidemic prevention measures and response methods have gradually embarked on the right path from the chaos. 4. Faced with a shortage of anti-epidemic materials, hospitals have been working hard to deal with risk management. Based on the above findings, this research provides some policy recommendations for hospitals to mobilize and respond to similar viral diseases in the future so as to follow up with medical institutions for learning and reference.
Rapporti di organizzazioni sul tema "SANS data point"
1
Fisk, Charles J., e Bernard C. Cohenour. Tidal and Lunar Data for Point Mugu, San Nicolas Island, and the Barking Sands Area During 1995. Fort Belvoir, VA: Defense Technical Information Center, dicembre 1994. http://dx.doi.org/10.21236/ada289877.
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Fisk, Charles J., e Bernard C. Cohenour. Tidal and Linar Data for Point Mugu, San Nicolas Island, and the Barking Sands Area During 1994. Fort Belvoir, VA: Defense Technical Information Center, dicembre 1993. http://dx.doi.org/10.21236/ada276036.
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Fisk, Charles. Tidal and Lunar Data for Point Mugu, San Nicholas Island, and the Barking Sands Area During 1991. Fort Belvoir, VA: Defense Technical Information Center, dicembre 1990. http://dx.doi.org/10.21236/ada229479.
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Fisk, Charles J., e Bernard C. Cohenour. Tidal and Lunar Data for Point Mugu and San Nicolas Island During 1996. Fort Belvoir, VA: Defense Technical Information Center, dicembre 1995. http://dx.doi.org/10.21236/ada302522.
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