87 research outputs found
The turbulent dissipation rate from PIV measurements
No full textThe result of a particle-image velocimetry (PIV) measurement is a velocity field averaged over interrogation windows. This severely affects the measurement of small-scale turbulence quantities when the interrogation window size is much larger than the smallest length scale in turbulence. A direct measurement of the dissipation rate demands the measurement of gradients of the velocity field, which are now underestimated because the small-scale motion is not resolved. A popular procedure is to relate the statistical properties of the measured, but underresolved gradients to those of the true ones, invoking a large-eddy argument [3]. We show that the used proportionality constant, the Smagorinsky constant, should depend on the window overlap, on the used elements of the strain tensor, and on the way in which derivatives are approximate
How the dispersion of a droplet cloud depends on its initial size
No full textA cloud of droplets evolves under the influence of strong turbulence. The droplets are made from a phosphorescent fluid. From this cloud we select at t = 0 a narrow line by exciting the droplets with a UV laser, which causes them to glow for a few milliseconds. The dispersion of this line is followed in time using a fast intensified camera. A large range of droplet sizes (Stokes number St) was measured. It appears that lines with St \approx 1 disperse faster than a line of fluid tracers. Lines of droplets which are narrowest initially, spread fastest
Volumetric Properties Of Binary Mixtures Of (water + Organic Solvents) At Temperatures Between T = 288.15 K And T = 303.15 K At P = 0.1 Mpa
No full textIn this work, densities of binary mixtures of {water + formamide (FM), or + N,N-dimethylformamide (DMF), or + dimethylsulfoxide (DMSO), or + N,N-dimethylacetamide (DMA), or + 1,4-dioxane}, have been determined under atmospheric pressure as a function of composition and temperature using a vibrating-tube densimeter. The temperatures studied were T = (288.15, 293.15, 298.15, and 303.15) K. The excess molar volumes ( V m E ), calculated from density data, are negative over the whole mole fraction range for the temperature range studied. The V m E values have been fitted to Redlich-Kister polynomial equation and others volumetric properties were calculated. The partial molar volumes at infinite dilution of each component ( over(V, ̄) i ∞ ) have been determined using three different methods. © 2005 Elsevier Ltd. All rights reserved.385526541Astarita, G., Savage, D.W., Bisio, A., (1983) Gas Treating with Chemical Solvents, , Wiley, New YorkTôrres, R.B., Francesconi, A.Z., Volpe, P.L.O., (2004) J. Mol. Liq., 110, pp. 81-85Tôrres, R.B., Francesconi, A.Z., Volpe, P.L.O., (2003) Fluid Phase Equilibr., 210, pp. 287-306Tôrres, R.B., Pina, C.G., Francesconi, A.Z., (2003) J. Mol. Liq., 107, pp. 127-139Tôrres, R.B., Francesconi, A.Z., (2003) J. Mol. Liq., 103-104, pp. 99-110Tôrres, R.B., Francesconi, A.Z., Volpe, P.L.O., (2003) J. Solution Chem., 32, pp. 417-434Tôrres, R.B., Francesconi, A.Z., (2002) Fluid Phase Equilibr., 200 (2), pp. 317-328Tôrres, R.B., Francesconi, A.Z., Volpe, P.L.O., (2002) Fluid Phase Equilibr., 200 (1), pp. 1-10Scharlin, P., Steinby, K., Domańska, U., (2002) J. Chem. Thermodyn., 34, pp. 927-957Deshwal, B.R., Singh, K.C., (2003) Indian J. Chem., 42, pp. 467-472Zaichikov, A.M., (2001) Russ. J. General Chem., 71, pp. 162-167Jelinska-Kazimierczuk, M., Szydlowski, J., (2001) J. Solution Chem., 30, pp. 623-640Lin, R., Hu, X., Ren, X., (2000) Thermochim. Acta, 352-353, p. 31Sacco, A., Matteoli, E., (1997) J. Solution Chem., 26, pp. 527-535Miyai, K., Nakamura, M., Tamura, K., Murakami, S., (1997) J. Solution Chem., 26, pp. 973-987Singh, P.P., Raj, B., (1993) Thermochim. Acta, 230, pp. 113-122Hynčica, P., Hnedkovský, L., Cibulka, I., (2002) J. Chem. Thermodyn., 34, pp. 861-873Maham, Y., Teng, T.T., Hepler, L.G., Mather, A.E., (2002) Thermochim. Acta, 386, pp. 111-118Lebrette, L., Maham, Y., Teng, T.T., Hepler, L.G., Mather, A.E., (2002) Thermochim. Acta, 386, pp. 119-126Chan, C., Maham, Y., Mather, A.E., Mathonat, C., (2002) Fluid Phase Equilibr., 198, pp. 239-250Zhang, F.Q., Li, H.P., Daí, M., Zhao, J.P., (1995) Thermochim. Acta, 254, pp. 347-357Maham, Y., Teng, T.T., Mather, A.E., Hepler, L.G., (1995) Can. J. Chem., 73, pp. 1514-1519Iloukhani, H., Parsa, J.B., Soltanieh, M., (2001) J. Solution Chem., 30, pp. 807-814Amalendu, P., Kumar, A., (1999) Fluid Phase Equilibr., 161, pp. 153-168Davis, M.I., (1993) Chem. Soc. Rev., 127, pp. 127-134Uosaki, Y., Iwama, F., Moriyoshi, T., (1992) J. Chem. Thermodyn., 24, pp. 797-808Aminabhavi, T.M., Gopalakrishna, B., (1995) J. Chem. Eng. Data, 40, pp. 856-86
Authoring multimedia in the CMIF environment
No full textWe present the user interface to the CMIF authoring
environment for constructing and playing multimedia
presentations. Within the environment an author constructs
a presentation in terms of its structure and additional
synchronization constraints, from which the actual timing
information is derived.
The CMIF authoring environment presents three main
views of a multimedia presentation: a hierarchy view for
manipulating and viewing a presentation’s hierarchical
structure; a channel view for managing logical resources
and specifying and viewing precise timing constraints; and a
player for playing the presentation
Productiviteitstrends in de sector verpleging, verzorging en thuiszorg: Een empirisch onderzoek naar het effect van regulering op productiviteit 1972-2010
No full textIn its 2011 letter on the subject of the labour market, the Ministry of Health, Welfare and Sports has indicated that it intends to actualize an increase of productivity in the health care sector in order to contribute to a solution for future problems in the labour market. Developing new policy requires insight into policy measures already in place and the effect that they have had on productivity.Innovation SystemsTechnology, Policy and Managemen
Effects of heavy metals on microbial diversity and bacterial resistance in marine sediments
No full textIn North-Western Europe alone more than 200 million cubic meters of contaminated sludge is dredged on an annual basis. Deposition of dredged harbour sediments in relatively undisturbed ecosystems is often considered a viable option, under the assumption that metals are not released into the environment. This research initially focused on the effects of heavy metals on biodiversity: which types of bacteria disappear and which proliferate? Additionally, this research aimed to develop a new method to analyse effects of heavy metals. Conventional chemical analyses only provide information about the total amount of heavy metals. This is not always relevant, as clay particles, for instance, adsorb heavy metals and therewith lower metal toxicity. In this research a biological essay was developed which does not determine the amount of metal but the toxicity of a metal.Applied Science
Productiviteitstrends in de sector verpleging, verzorging en thuiszorg
No full textDe productiviteit in de VVT-sector is in de periode 1972-1996 gedaald met gemiddeld 0,6 procent per jaar. Vanaf 1997 is de productiviteitsdaling gemiddeld 2 procent per jaar. De daling van de productiviteit valt in de periode waarin veel veranderingen van de AWBZ hebben plaatsgevonden en waarin ook meer en meer kwaliteitsbeleid is gevoerd. Tegelijk is de zorgzwaarte toegenomen. Zorgelijk is de autonome toename van de inzet van personeel in de hele periode en (geringe) afname van gebruik van materiaal en kapitaal. De aard van de dienstverlening leent zich misschien niet voor substitutie van personeel voor materiaal en kapitaal. Dieper inzicht in de oorzaken van de productiviteitsdaling kan verkregen worden door systematische bedrijfsvergelijkingen van alle VVT-instellingen op prestatie-indicatoren, waaronder de productie, ingezette middelen, prijzen en productiviteitsontwikkeling, maar ook technologie en innovatiebeleid, inkoopbeleid, personeelsbeleid, governance en managementstructuur. Dergelijke bedrijfsvergelijking kan de basis vormen voor nieuw beleid
Fabriekschema voor de Productie van Furfural
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
Rapid and reversible impairment of episodic memory by a high-fat diet in mice
No full textThe datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request. This work was supported by an EASTBIO BBSRC PhD studentship to F.H.M., L.M.W., C.G., A.C.M., G.W.H. and F.M.C. are supported by Scottish Government’s Rural and Environment Science and Analytical Services Division (RESAS).Peer reviewe
Construction Of A Differential Isothermal Calorimeter Of High Sensitivity And Low Cost [construção De Um Calorímetro Isotérmico Diferencial De Alta Sensibilidade E Baixo Custo]
No full textThe high cost of sensitivity commercial calorimeters may represent an obstacle for many calonmetric research groups. This work describes the construction and calibration of a batch differential heat conduction calorimeter with sample cells volumes of about 400 μL. The calorimeter was built using two small high sensibility square Peltier thermoelectric sensors and the total cost was estimated to be about USS 500. The calorimeter was used to study the excess enthalpy of solution of binary mixtures of liquids, as a function of composition, for the following binary systems of solvents: water + 1,4-dioxane or + dimethylsulfoxide at 298,2 ± 0,5 K.32616511654Miles, R.J., Beezer, A.E., Perry, B.F., (1987) Thermal and Energetic Studies of Cellular Biological Systems, p. 106. , IOP Publishing LTD: BristolVolpe, P.L.O., (1993) Quim. Nova, 16, p. 49Perles, C.E., (2006) Dissertação de Mestrado, , Universidade Estadual de Campinas, BrasilScatchard, G., (1931) Chem. Rev., 8, p. 321Scatchard, G., Hamer, W.J., (1935) J. Am. Chem. Soc., 57, p. 1805Guggenheim, E.A., (1967) Thermodynamics, 5th Ed., , Publishing Company: North-HollandRowlinson, J.S., Swinton, F.J., (1982) Liquid and Liquid Mixtures, 3rd Ed., , Butterworths: LondonSedlaček, V., (1986) Non-Ferrous Metals and Alloys, , Elsevier: New YorkChristensen, J.J., (1982) Handbook of Heats of Mixing, p. 1414. , John Wiley & Sons: USA, 1456, 1468Olofsson, G., Berling, D., Markova, N., Molund, M., (2000) Thermochim. Acta, 347, p. 31Tôrres, R.B., Marchiore, A.C.M., Volpe, P.L.O., (2006) J. Chem. Thermodyn, 38, p. 52
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