Thematische Bibliographien / Snow gun

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Auswahl der wissenschaftlichen Literatur zum Thema „Snow gun“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 11. Februar 2022

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Zeitschriftenartikel zum Thema "Snow gun"

Lilienfeld, David E. „John Snow: The First Hired Gun?“ American Journal of Epidemiology 152, Nr. 1 (01.07.2000): 4–9. http://dx.doi.org/10.1093/aje/152.1.4.

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Prentice, M. L., und R. K. Matthews. „Tertiary ice sheet dynamics: The Snow Gun Hypothesis“. Journal of Geophysical Research: Solid Earth 96, B4 (10.04.1991): 6811–27. http://dx.doi.org/10.1029/90jb01614.

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Sunwall, David A., Marvin A. Speece und Stephen F. Pekar. „Advances in on-sea-ice seismic reflection methods using an air gun: McMurdo Sound, Antarctica“. GEOPHYSICS 77, Nr. 1 (Januar 2012): S19—S30. http://dx.doi.org/10.1190/geo2011-0127.1.

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During the austral spring of 2008, 48 km of multichannel seismic reflection data were collected on a sea-ice platform east of New Harbor, Southern McMurdo Sound, Antarctica. These seismic data were collected to support the Antarctic Geological Drilling Program whose goal is to recover sedimentary rock cores from the continental margin of Antarctica and to better understand the climatic, cryospheric, and tectonic history of Antarctica. A Generator-Injector air gun, deployed through holes drilled in the sea ice, was used for a seismic source, and reflected energy was recorded on a snow streamer consisting of 60 gimbaled geophones. The Offshore New Harbor seismic system has increased the rate of data acquisition by 53% compared to previous Antarctic air-gun/snow-streamer seismic systems. In addition to conventional on-sea-ice seismic data processing, new processing steps were used to correct problems associated with the use of a Generator-Injector air gun in a sea-ice environment. Source timing errors, caused by miscommunications between the Generator-Injector air gun and air-gun controller, were corrected. Newly discovered bubble-plume static errors and bubble-plume wavelet distortions degraded seismic data quality and are attributed to bubble plumes created by the Generator-Injector air-gun blast. Our investigation shows that these bubble plumes were preserved for at least 40 hours beneath the sea ice and created isolated low-velocity zones. Using finite-element methods, we reproduced static errors and wavelet distortions by incorporating the effects of bubble plumes into the finite-element model. The results of finite-element modeling confirmed our hypothesis that bubble-plume static errors and bubble-plume wavelet distortions were caused by near-surface low-velocity features. Therefore, we incorporated new processing steps which remove bubble-plume effects and improve the quality of final seismic sections.

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Heil, Jamie, Behrouz Mohammadian, Mehdi Sarayloo, Kevin Bruns und Hossein Sojoudi. „Relationships between Surface Properties and Snow Adhesion and Its Shedding Mechanisms“. Applied Sciences 10, Nr. 16 (05.08.2020): 5407. http://dx.doi.org/10.3390/app10165407.

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Understanding the mechanisms of snow adhesion to surfaces and its subsequent shedding provides means to search for active and passive methods to mitigate the issues caused by snow accumulation on surfaces. Here, a novel setup is presented to measure the adhesion strength of snow to various surfaces without altering its properties (i.e., liquid water content (LWC) and/or density) during the measurements and to study snow shedding mechanisms. In this setup, a sensor is utilized to ensure constant temperature and liquid water content of snow on test substrates, unlike inclined or centrifugal snow adhesion testing. A snow gun consisting of an internal mixing chamber and ball valves for adjusting air and water flow is designed to form snow with controlled LWC inside a walk-in freezing room with controlled temperatures. We report that snow adheres to surfaces strongly when the LWC is around 20%. We also show that on smooth (i.e., RMS roughness of less than 7.17 μm) and very rough (i.e., RMS roughness of greater than 308.33 μm) surfaces, snow experiences minimal contact with the surface, resulting in low adhesion strength of snow. At the intermediate surface roughness (i.e., RMS of 50 μm with a surface temperature of 0 °C, the contact area between the snow and the surface increases, leading to increased adhesion strength of snow to the substrate. It is also found that an increase in the polar surface energy significantly increases the adhesion strength of wet snow while adhesion strength decreases with an increase in dispersive surface energy. Finally, we show that during shedding, snow experiences complete sliding, compression, or a combination of the two behaviors depending on surface temperature and LWC of the snow. The results of this study suggest pathways for designing surfaces that might reduce snow adhesion strength and facilitate its shedding.

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van der Wel, L. G., H. A. Been, R. S. W. van de Wal, C. J. P. P. Smeets und H. A. J. Meijer. „Constraints on the δ<sup>2</sup>H diffusion rate in firn from field measurements at Summit, Greenland“. Cryosphere 9, Nr. 3 (22.05.2015): 1089–103. http://dx.doi.org/10.5194/tc-9-1089-2015.

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Abstract. We performed detailed 2H isotope diffusion measurements in the upper 3 m of firn at Summit, Greenland. Using a small snow gun, a thin snow layer was formed from 2H-enriched water over a 6 × 6 m2 area. We followed the diffusion process, quantified as the increase of the δ2H diffusion length, over a 4-year period, by retrieving the layer once per year by drilling a firn core and slicing it into 1 cm layers and measuring the δ2H signal of these layers. We compared our experimental findings to calculations based on the model by Johnsen et al. (2000) and found substantial differences. The diffusion length in our experiments increased much less over the years than in the model. We discuss the possible causes for this discrepancy and conclude that several aspects of the diffusion process in firn are still poorly constrained, in particular the tortuosity.

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van der Wel, L. G., H. A. Been, R. S. W. van de Wal, C. J. P. P. Smeets und H. A. J. Meijer. „Constraints on the δ<sup>2</sup>H diffusion rate in firn from field measurements at Summit, Greenland“. Cryosphere Discussions 9, Nr. 1 (11.02.2015): 817–59. http://dx.doi.org/10.5194/tcd-9-817-2015.

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Abstract. We performed detailed 2H isotope diffusion measurements in the upper 3 m of firn at Summit, Greenland. Using a small snow gun, a thin snow layer was formed from 2H-enriched water over a 6 m × 6 m area. We followed the diffusion process, quantified as the increase of the δ2H diffusion length, over a four years period, by retrieving the layer once per year by drilling a firn core and slicing it into 1 cm layers and measuring the δ2H-signal of these layers. We compared our experimental findings to calculations based on the model by Johnsen et al. (2000), and found substantial differences. The diffusion length in our experiments increased much less over the years than in the model. We discuss the possible causes for this discrepancy, and conclude that several aspects of the diffusion process in firn are still poorly constrained, in particular the tortuosity.

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De Pablo, M. A., M. Ramos, A. Molina, G. Vieira, M. A. Hidalgo, M. Prieto, J. J. Jiménez et al. „Frozen ground and snow cover monitoring in the South Shetland Islands, Antarctica: Instrumentation, effects on ground thermal behaviour and future research“. Cuadernos de Investigación Geográfica 42, Nr. 2 (13.09.2016): 475. http://dx.doi.org/10.18172/cig.2917.

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The study of the thermal behavior of permafrost and active layer on the South Shetland Islands, in the western side of the Antarctic Peninsula (Antarctica), has been our research topic since 1991, especially after 2006 when we established different active layer thickness and ground thermal monitoring sites of the CALM and GTN-P international networks of the International Permafrost Association. Along this period, the snow cover thickness did not change at those sites, but since 2010, we observed an elongation on the snow cover duration, with similar snow onset, but a delay on the snow offset. Due to the important effects of snow cover on the ground thermal behavior, we started in late 2015 a new research project (PERMASNOW) focused on the accurate monitoring of the snow cover (duration, density, snow water equivalent and distribution), from very different approaches, including new instrumentation, pictures analysis and remote sensing on optical and radar bands. Also, this interdisciplinary and international research team intends to compare the snow cover and ground thermal behavior with other monitoring sites in the Eastern Antarctic Peninsula where the snow cover is minimum and remains approximately constant.

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De Pablo, M. A., J. J. Jiménez, M. Ramos, M. Prieto, A. Molina, G. Vieira, M. A. Hidalgo et al. „Frozen ground and snow cover monitoring in Livingston and Deception islands, Antarctica: preliminary results of the 2015-2019 PERMASNOW project“. Cuadernos de Investigación Geográfica 46, Nr. 1 (24.06.2020): 187–222. http://dx.doi.org/10.18172/cig.4381.

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Since 2006, our research team has been establishing in the islands of Livingston and Deception, (South Shetland archipelago, Antarctica) several monitoring stations of the active layer thickness within the international network Circumpolar Active Layer Monitoring (CALM), and the ground thermal regime for the Ground Terrestrial Network-Permafrost (GTN-P). Both networks were developed within the International Permafrost Association (IPA). In the GTN-P stations, in addition to the temperature of the air, soil, and terrain at different depths, the snow thickness is also monitored by snow poles. Since 2006, a delay in the disappearance of the snow layer has been observed, which could explain the variations we observed in the active layer thickness and permafrost temperatures. Therefore, in late 2015 our research group started the PERMASNOW project (2015-2019) to pay attention to the effect of snow cover on ground thermal This project had two different ways to study the snow cover. On the first hand, in early 2017 we deployed new instrumentation, including new time lapse cameras, snow poles with high number of sensors and a complete and complex set of instruments and sensors to configure a snow pack analyzer station providing 32 environmental and snow parameters. We used the data acquired along 2017 and 2018 years with the new instruments, together with the available from all our already existing sensors, to study in detail the snow cover. On the other hand, remote sensing data were used to try to map the snow cover, not only at our monitoring stations but the entire islands in order to map and study the snow cover distribution, as well as to start the way for future permafrost mapping in the entire islands. MODIS-derived surface temperatures and albedo products were used to detect the snow cover and to test the surface temperature. Since cloud presence limited the acquisition of valid observations of MODIS sensor, we also analyzed Terrasar X data to overcome this limitation. Remote sensing data validation required the acquirement of in situ ground-true data, consisting on data from our permanent instruments, as well as ad hoc measurements in the field (snow cover mapping, snow pits, albedo characterization, etc.). Although the project is finished, the data analysis is still ongoing. We present here the different research tasks we are developing as well as the most important results we already obtained about the snow cover. These results confirm how the snow cover duration has been changing in the last years, affecting the ground thermal behavior.

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Ali Umud Aliyev, Ali Umud. „National calendar, some historical days, our traditions and spiritual values“. SCIENTIFIC WORK 62, Nr. 01 (10.02.2021): 37–42. http://dx.doi.org/10.36719/2663-4619/62/37-42.

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It is the people who make the history live, the people is the living history. The ancient inhabitants of the universe, our ancestors, our great ancestors created separate calendars on the basis of their experimental knowledge about the change of the year, month and day. The folk calendar, the lunar calendar, the solar calendar, and the lunar-solar calendar are the meanings that human beings have discovered by studying the mysteries of nature. As a result of man's connection with nature in every field, his observation and comparison, a folk calendar was formed. According to the folk calendar, our ancient ancestors, depending on the movement of celestial bodies, falling leaves from above or below in autumn, the position of clouds in the sky, the redness of the horizon in the morning or evening, the behavior of animals, birds flying close to the ground, weather, rain or snow predicted hurricanes and storms, earthquakes, hot and dry summers, and harsh winters.

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McCartney, M. R., und David J. Smith. „Electron beam induced modifications of SnO2 and SrTiO3“. Proceedings, annual meeting, Electron Microscopy Society of America 48, Nr. 4 (August 1990): 800–801. http://dx.doi.org/10.1017/s0424820100177131.

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In addition to providing information about the interaction of ionizing radiation with solids, a knowledge of the changes induced in the specimen by the electron beam is important when interpreting high-resolution electron micrographs of surfaces. Beam-induced modifications to the surfaces of several maximally-valent transition-metal oxides (TMO) have been previously reported. It was found that irradiation at 400keV within a high-resolution electron microscope (HREM) caused TiO2, V2O5, Nb2O5, and WO3 to reduce epitaxially to their respective monoxide phases. Because of their ionicity and relatively deep core levels, these materials should be susceptible to electron-stimulated desorption (ESD) of oxygen due to a radiolytic damage mechanism proposed by Knotek and Feibelman (K-F) involving inter-atomic Auger decay of core holes on the metal ions. Reduction of these oxides to the (metallic) monoxide phases within the HREM is consistent with this mechanism. When these oxides were exposed to the extreme current densities available in a 100keV electron microscope equipped with a field emission gun (FEG) they developed pits at the probe position . Electron energy loss spectroscopy (EELS) studies established that they had suffered mass loss and a reduction in the oxygen/metal ratio. HREM imaging occasionally revealed lattice fringes corresponding to the bare metal in the amorphous contrast of these pits.

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Dissertationen zum Thema "Snow gun"

Křepela, Radim. „Energetická náročnost výroby umělého sněhu“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443196.

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The presented diploma thesis informs about the origin, history, and benefits of technical snowmaking. It introduces what snow equipment consists of and what processes artificial snow is produced. It also shows the price of tons of snow produced from individual commercially available equipment. In the experimental part, the work deals with the calculation of droplet freezing for various input parameters of water, environment, and equipment. A sample calculation was performed for a falling water droplet from a snow lances. The droplet of discharged water was 0.3 mm in size and had a temperature of 2 ° C. The temperature of the environment was chosen to be -10 ° C. Furthermore, the trajectory of the droplet from a snow gun was determined. In the design, a specific snow pole was designed for the specified parameters, including the speed of the environment. The results were then compared with snow poles available on the market.

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Gon?alves, Ismael Carneiro. „Desenvolvimento de eletrodos difusores de fluido para aplica??es direcionadas ao tratamento de ?gua“. UFVJM, 2012. http://acervo.ufvjm.edu.br/jspui/handle/1/815.

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Submitted by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-01-06T17:51:26Z No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) Disserta??o Completa Times New Roman - Com Assinatura da Ban.pdf: 4476480 bytes, checksum: 309e034f51cd7605224651743ecee1cd (MD5)
Approved for entry into archive by Rodrigo Martins Cruz (rodrigo.cruz@ufvjm.edu.br) on 2016-01-07T12:06:06Z (GMT) No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) Disserta??o Completa Times New Roman - Com Assinatura da Ban.pdf: 4476480 bytes, checksum: 309e034f51cd7605224651743ecee1cd (MD5)
Made available in DSpace on 2016-01-07T12:06:06Z (GMT). No. of bitstreams: 2 license_rdf: 22974 bytes, checksum: 99c771d9f0b9c46790009b9874d49253 (MD5) Disserta??o Completa Times New Roman - Com Assinatura da Ban.pdf: 4476480 bytes, checksum: 309e034f51cd7605224651743ecee1cd (MD5) Previous issue date: 2012
Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (Capes)
Filmes finos de di?xido de estanho dopados com antim?nio foram confeccionados pelo m?todo de deposi??o t?rmica sobre micro tela de a?o ASTM 316 objetivando a confec??o de anodos perme?veis a fluido para uso em reatores filtro-prensa. Os ?xidos nas formas de filmes suportados e de p? foram investigados pelas t?cnicas de energia dispersiva de raios-X (EDX), difratometria de raios-X (DRX) e microscopia eletr?nica de varredura (MEV). O estudo de EDX revelou que a raz?o efetiva Sb/Sn nos filmes ? maior que a nominal, enquanto que o DRX revelou que o SnO2 est? presente na forma da estrutura da cassiterita, que n?o h? presen?a de picos relacionados a ?xidos de antim?nio e que o aumento da concentra??o de Sb leva a uma diminui??o da cristalinidade dos filmes. O estudo de MEV revelou que os filmes apresentam estrutura compacta e n?o-porosa. A caracteriza??o eletroqu?mica dos anodos 316/Sb-SnO2 conduzida numa c?lula do tipo eletr?lito polim?rico s?lido (EPS) empregando-se a membrana Nafion? 117 da Dupont revelou a partir da voltametria c?clica e das curvas de polariza??o que o sobrepotencial para a rea??o de desprendimento de oxig?nio (RDO) aumenta com a concentra??o de antim?nio. O estudo envolvendo a an?lise da durabilidade dos anodos conduzido em condi??es galvanost?ticas (20 mA cm-2) revelou que a vida ?til do anodo aumenta com a concentra??o de Sb passando por um ponto de m?ximo. O anodo 316/Sb-SnO2 alojado em c?lula do tipo EPS na condi??o de ?zero-gap? e na aus?ncia de eletr?litos l?quidos foi aplicado na degrada??o eletroqu?mica do corante t?xtil Cibacron? Marinho F-4G considerado como poluente modelo. A cin?tica de descolora??o seguiu o modelo de pseudo-primeira ordem representativo do controle difusional atrav?s da microestrutura do ?nodo sob influ?ncia da turbul?ncia causada pelo desprendimento de oxig?nio. Foi verificada uma descolora??o superior a 90% e uma degrada??o do composto parental maior que 50% ap?s 3,5 h de eletr?lise. A an?lise das curvas cronopotenciom?tricas indicou que a desativa??o dos anodos ? fortemente influenciada pela disponibilidade dos radicais hidroxilas adsorvidos na superf?cie do eletrodo.
Disserta??o (Mestrado) ? Programa de P?s-Gradua??o em Qu?mica, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 2012.
ABSTRACT Thin films of tin dioxide doped with antimony were prepared by the thermal decomposition method onto a stainless steel fine mesh (ASTM 316) in order to obtain a fluid permeable anode for application in filter-press reactors. Films and powders of Sb-SnO2 were investigated using the energy dispersive X-ray (EDX), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The EDX revealed that the effective Sb/Sn molar ratio in films is greater than the nominal composition, while the XRD has revealed that SnO2 is present in the crystalline form of the cassiterite structure. In addition, it was verified the absence of peaks accounted for the antimony oxides even for higher amounts of Sb, while the addition of Sb lead to a decrease in the film crystallinity. SEM images showed that the thin films are rather compact. The electrochemical characterization of the fluid permeable anode composed of 316/Sb-SnO2 was carried out in an SPE cell using the Nafion? 117 membrane as the electrolyte. Cyclic voltammograms and polarization curves showed the overpotential for the oxygen evolution reaction (OER) increases upon increasing the antimony concentration. The endurance test carried out under galvanostatic conditions (20 mA cm-2) has revealed that the anode service life increases upon increasing the Sb concentration passing through a maximum. The 316/Sb-SnO2 anode housed in an SPE cell in the zero-gap condition and in the absence of liquid electrolytes was applied on degradation of the Cibacron? Marinho F-4G dye, considered as the pollutant model. Discoloration kinetics was described by the pseudo-first order model describing the diffusion control across the anode microstructure under the influence of the turbulence caused by the OER. A discoloration percentage higher than 90% and a degradation percentage of the parental compound greater than 50% were both achieved after 3.5 h of electrolysis. Analysis of the chronopotentiometric curves indicated the anode deactivation is considerable effected by the availability of the hydroxyl radicals adsorbed on the anode surface.

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Arnold, Amanda Suzanne. „Shift“. Digital Archive @ GSU, 2007. http://digitalarchive.gsu.edu/english_theses/26.

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The following is a collection of original poetry. The manuscript consists of an introduction explaining influences and style, and four chapters of poems categorized by subject matter: object/nature, writing/creativity, relationships, and family/figures. INDEX WORDS: Poetry, Poem

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A, PanimayaSelvi Isabel, und 安玫. „GaN Based LED’s Grown on Patterned Sapphire Substrate and The Comparison of SnO2 and Ti-doped SnO2 Sensing Membrane Applied for EIS Based Bio-Sensing Applications“. Thesis, 2017. http://ndltd.ncl.edu.tw/handle/a36h45.

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博士
國立交通大學
材料科學與工程學系所
106
The thesis includes two themes: First part is a detailed study of Crystal quality and light output power of GaN LED on micro-concave patterned sapphire substrate. The second part is a comparative study of SnO2 and SnTiO2 sensing membrane applied for EIS based biosensing applications. Brief description of the study is as follows. First Theme: The crystal quality and light output power of GaNbased LEDs grown on micro-concave patterned sapphire substrate (CPSS) were investigated. It was found that the crystal quality of GaN-based LEDs grown on CPSS improved with the decrease of the pattern space (percentage of C-plane). However, when the pattern space decreased to 0.41 μm (S0.41-GaN), the GaN crystallinity dropped. On the other hand, the light output power of GaN-based LEDs was increased with the pattern space due to the change of the light extraction efficiency. Second Theme: We investigated the effect of rapid thermal annealing (RTA) on the sensing and structural characteristics of Tidoped SnO2 based electrolyte-insulator-semiconductor (EIS) pH sensors. Ti-doped Tin oxide (SnO2) EIS sensor with 700 °C post deposition annealing exhibited the best sensing characteristics in terms of sensitivity, linearity, hysteresis and drift rate. This is because Ti incorporation can improve the thin-film stoichiometry by reducing dangling bonds on the dielectric surface and improve the temperature stability. We further studied the structural, compositional, and morphological characteristics of the deposited thin-film. RTA treatment increases the sensitivity and linearity by creating larger grain size with larger grain boundaries and higher number of surface sites. Sodium (Na+ ) and potassium (K+ ) sensing performance also measured using fabricated EIS sensors.

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Bücher zum Thema "Snow gun"

Gu shi gun xue qiu: Da xiang cai fu zeng zhi bao wei zhan = Snow ball in stock market. Beijing Shi: Zhongguo gong ren chu ban she, 2011.

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Conan, Doyle Arthur. Fei cui huang guan an. Xianggang: Xiao shu miao jiao yu chu ban she you xian gong si, 2004.

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Meili xue shan zi ran guan cha shou ce: A field guide to the wildlife of Meili snow mountain national park. Beijing: Zhongguo da bai ke quan shu chu ban she, 2011.

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WWF Attitude, Official Acclaim Strategy Guide. Glen Cove, NY: Acclaim Entertainment, Incorporated, 1999.

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Conan, Doyle Arthur. The Mysteries of Sherlock Holmes. New York, USA: Grosset & Dunlap, 1996.

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Short stories for students: Presenting analysis, context, and criticism on commonly studied short stories. Detroit, Mich: Gale, 2010.

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Short stories for students: Presenting analysis, context, and criticism on commonly studied short stories. Detroit, Mich: Gale, 2009.

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Short stories for students: Presenting analysis, context, and criticism on commonly studied short stories. Detroit, Mich: Gale, 2010.

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Constantakis, Sara. Short stories for students: Presenting analysis, context, and criticism on commonly studied short stories. Detroit, Mich: Gale, 2010.

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Conan, Doyle Arthur. The Classic Illustrated Sherlock Holmes: Thirty Seven Short Stories Plus a Complete Novel. Stamford, CT, USA: Longmeadow Press, 1987.

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Buchteile zum Thema "Snow gun"

„Snow Blind: translated by Foster Robertson and Lee Yu“. In Running Mother and Other Stories, 163–208. Columbia University Press, 2008. http://dx.doi.org/10.7312/guo-14734-007.

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Javidi, Giti. „Hyperspectral Microwave Atmospheric Sounder (HyMAS) Graphical User Interface Design“. In Strategic Innovations and Interdisciplinary Perspectives in Telecommunications and Networking, 180–95. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8188-8.ch009.

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The hyperspectral microwave atmospheric sounder (HyMAS), for weather and climate missions, is capable of all-weather sounding equivalent to hyperspectral infrared sounders (in which clouds decrease the accuracy of the results) in clear air with vertical resolution of approximately 1 km. This will improve both the vertical and horizontal resolutions of the atmosphere. Through the use of independent RF antennas that sample the volume of the Earth's atmosphere through various levels of frequencies, thereby producing a set of dense, spaced vertical weighting functions, hyperspectral microwave is achieved. This yields surface precipitation rate and water path retrievals for small hail, soft hail, or snow pellets, snow, rainwater, etc. with high accuracies. One of HyMAS requirements is a graphical user interface (GUI). Hyperspectral measurements allow the user to determine the Earth's temperature with vertical resolution exceeding 1km (1093.61 yards).

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Gaskell, Elizabeth. „Chapter XXXVIII The Recognition“. In Sylvia's Lovers. Oxford University Press, 2013. http://dx.doi.org/10.1093/owc/9780199656738.003.0039.

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Far away, over sea and land, over sunny sea again, great guns were booming on that 7th of May, 1799.* The Mediterranean came up with a long roar on a beach glittering white with snowy sand, and the fragments of innumerable sea-shells, delicate and...

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Kelso, John R. „Federals in Retreat, Refugees in the Snow, and Vengeance in Buffalo“. In Bloody Engagements, herausgegeben von Christopher Grasso. Yale University Press, 2017. http://dx.doi.org/10.12987/yale/9780300210965.003.0004.

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In this chapter, John Russell Kelso talks about the events that transpired between October 1861 and February 1862, highlighted by the retreat of the Federals who then took revenge in Buffalo. Leaving Rolla in the morning, Kelso encountered a large body of cavalry led by Col. Thomas Roe Freeman. Soon a large portion of John C. Frémont's army began to make their way to Springfield. Kelso then left his comrades and went into hiding all alone only a few miles from Buffalo, and in a rebel locality. Kelso narrates how he was captured by Confederate rebels but was able to escape and gave Gen. Samuel R. Curtis a full account of what he had gone through.

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Derbyshire, Edward. „Natural Dust and Pneumoconiosis in High Asia“. In Geology and Health. Oxford University Press, 2003. http://dx.doi.org/10.1093/oso/9780195162042.003.0007.

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High Asia, defined here as that great tract of land from the Himalaya- Karakoram in the south to the Tian Shan in the north and the Pamir in the west to the Qinling Mountains in the east, is a very dusty place. Whole communities of people in this region are exposed to the adverse effects of natural (aerosolic) dusts at exposure levels reaching those encountered in some high-risk industries. Outdooor workers are at particular risk. However, few data are available on the magnitude of the dust impact on human health. The effect of such far-travelled particles on the health of the human population in the Loess Plateau, and including major Chinese cities, has received relatively little attention to date. A combination of the highest known uplift rates, rapid river incision (up to 12 mm/yr: Burbank et al. 1996), unstable slopes, glaciation and widespread rock breakup by crystal growth during freezing (frost action), and by hydration of salts (salt weathering) makes the High Asia region the world’s most efficient producer of silty (defined as between 2 and 63 μm) debris. The earliest written records of the dust hazard come from China, most notably in the “Yu Gong” by Gu Ban (ca 200 BC) (Wang and Song 1983). Here, deposits of wind-blown silt (known as ‘loess’) cover the landscape in a drape that is locally 500 m thick. In North China, the loess covers an area of over 600,000 km², most of it in the Loess Plateau, situated in the middle reaches of the Huang He (Yellow River). The characteristic properties of loess include high porosity and collapsibility on wetting (Derbyshire et al. 1995, Derbyshire and Meng 2000).Thus, it is readily reworked and redistributed by water. This process concentrates silts in large alluvial fans (up to 50 x 50 km) in the piedmont zones of 6,000 m high glacier- and snow-covered mountain ranges of western China, including the Altai Shan (‘shan’ = mountains), Tian Shan, Kunlun Shan, Qilian Shan, and Karakoram. These zones are loci for human populations, and also a major source of wind-blown dust.

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Konferenzberichte zum Thema "Snow gun"

Morency, Franc¸ois, Ste´phane Halle´, Slawomir Dreger und Daniel Jacques. „Design of a Small Snow Gun for Limited Area Using CFD“. In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95157.

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Most of the ski resorts rely on man made snow for early opening of the slope in fall and improve snow cover all winter. This paper present tools and relation useful for conceptual and preliminary sizing of a fan snow gun. Once an initial shape is obtained, design is enhanced using numerical simulation of fluid flow by CFD commercial flow solver. Proposed simple relations are helpful but still need further improvement. As design get more complex and precise, CFD solutions become more attractive. With actual CFD tools, it should be possible to run 3D simulation of a fan snow gun.

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Kobayashi, Yasuyuki, Kazuhide Kumakura, Tetsuya Akasaka, Hideki Yamamoto und Toshiki Makimoto. „Layered boron nitride as a release layer for mechanical transfer of GaN-based devices“. In 2014 Silicon Nanoelectronics Workshop (SNW). IEEE, 2014. http://dx.doi.org/10.1109/snw.2014.7348536.

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Kaushik, Pragyey Kumar, Sankalp Kumar Singh, Ankur Gupta, Ananjan Basu und Edward Yi Chang. „Resistive Approach for Extraction of Bias-Dependent Parasitic Resistance, Mobility and Virtual Gate Length in GaN HEMT“. In 2020 IEEE Silicon Nanoelectronics Workshop (SNW). IEEE, 2020. http://dx.doi.org/10.1109/snw50361.2020.9131661.

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Song, Bo, Mingda Zhu, Zongyang Hu, Meng Qi, X. Yan, Yu Cao, Erhard Kohn, Debdeep Jena und Huili Grace Xing. „AlGaN/GaN MIS-HEMT on silicon with steep sub-threshold swing < 60 mV/dec over 6 orders of drain current swing and relation to traps“. In 2014 Silicon Nanoelectronics Workshop (SNW). IEEE, 2014. http://dx.doi.org/10.1109/snw.2014.7348527.

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Kong, Changduk, Keonwoo Kim und Jihyun Kim. „Development of GUI Type On-Line Condition Monitoring Program for a Turboprop Engine Using LabVIEW®“. In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45337.

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Recently, the health monitoring system has been developed for precaution and maintenance action against faults or performance degradations of the advanced propulsion system which may be occurred in severe environments such as high altitude, foreign object damage particles, hot and heavy rain and snowy atmospheric conditions. However to establish this health monitoring system, the on-line condition monitoring program is firstly required, and the program must monitor the engine performance trend through comparison between measuring engine performance data and base performance results calculated by base engine performance model. This work aims to develop a GUI type on-line condition monitoring program for the PT6A-67 turboprop engine of a high altitude and long endurance operation UAV using LabVIEW. The base engine performance of the on-line condition monitoring program is simulated using component maps inversely generated from the limited performance deck data provided by engine manufacturer. The base engine performance simulation program is evaluated because analysis results by this program are well agreed with the performance deck data. The proposed on-line condition program can monitor the real engine performance as well as the trend through precise comparison between clean engine performance results calculated by the base performance simulation program and measuring engine performance signals. In the development phase of this monitoring system, a signal generation module is proposed to evaluate the proposed on-line monitoring system. For user friendly purpose, all monitoring program are coded by LabVIEW, and monitoring examples are demonstrated using the proposed GUI type on-condition monitoring program.

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