2,785 research outputs found
Polymer multimode waveguide optical and electronic PCB manufacturing
No full textThe paper describes the research in the £1.3 million IeMRC Integrated Optical and Electronic Interconnect PCB Manufacturing (OPCB) Flagship Project in which 8 companies and 3 universities carry out collaborative research and which was formed and is technically led by the author. The consortium’s research is aimed at investigating a range of fabrication techniques, some established and some novel, for fabricating polymer multimode waveguides from several polymers, some formulations of which are being developed within the project. The challenge is to develop low cost waveguide manufacturing techniques compatible with commercial PCB manufacturing and to reduce their alignment cost. The project aims to take the first steps in making this hybrid optical waveguide and electrical copper track printed circuit board disruptive technology widely available by establishing and incorporating waveguide design rules into commercial PCB layout software and transferring the technology for fabricating such boards to a commercial PCB manufacturer. To focus the research the project is designing an optical waveguide backplane to tight realistic constraints, using commercial layout software with the new optical design rules, for a demonstrator into which 4 daughter cards are plugged, each carrying an aggregate of 80 Gb/s data so that each waveguide carries 10 Gb/s
The Chance and Probability Concepts Project
No full textThis article, created by D.R. Green, describes an investigation of what concepts and intuitions concerning random processes are present in the minds of children of varying abilities across the 11-16 age range. The ability to list permutations, combinations and arrangements is also being investigated. The author states, "Over the past two decades the topic of 'Probabilityâ has been brought into the mathematics curriculum but it may be that this is more an empty gesture rather than a sound strategy." This article can help to alleviate many of the struggles in teaching probability concepts. The article is pitched at a more elementary audience, but is still a perfect resource for almost anyone teaching in the field
Achieving 10 ps coincidence time resolution in TOF-PET is an impossible dream
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.RST/Radiation, Science and TechnologyRST/Medical Physics & Technolog
Bepalen van het massatraagheidsmoment met behulp van een bifilar pendulum: Determining the moments of inertia using a bifilar pendulum
No full textThe aim of this thesis is to investigate the use of a bifilar pendulum for determining the moments of inertia of the TU Delft solar boat and to quantitatively predict the estimates. In the first part, several methods are discussed which can be applied in deriving the equations of motion of the pendulum. A new method, Kane's method, will be introduced. In the second part, this method will be used to derive the actual equations of motion. These equations are linearized around of the the pendulum's stationary positions to obtain expressions which link the moment of inertia about an axis to the period of oscillation of the pendulum about that axis. These equations are subsequently applied to the solar boat to derive estimates for the moments of inertia about the principle axis of the boat. The results of this thesis considers three different configurations of the bifilar pendulum with the solar boat suspended. One of these configurations results in the most accurate estimates for the moments of inertia, however, these have not been quantitatively predicted. The author suggests a modification in the definition of the bifilar pendulum such that this might be possible.Electrical Engineering, Mathematics and Computer ScienceNumerical analysi
An introduction to management science: quantitative approaches to decision making
No full textRetaining the accessible application-driven approach for which An Introduction to Management Science is highly regarded, adapting author Mik Wisniewski has carefully reworked the existing US textbook to benefit students across the UK, Europe, Middle East and Africa. Packed with diverse realistic examples from Scotland to Saudi Arabia, the landmark text from the ASW team is now available in a truly internationalised version for students studying Management Science and Operations Research at postgraduate and undergraduate level
Immunotherapy
No full textA chapter covering metastasis immunotherapy in multi-author volume devoted to all aspects of cancer metastasis
Nitric Oxide As An Activation Agent For Nucleophilic Attack In Trans-[ru(no)(nh3)4{p(oet)3}](pf 6)3
No full textThe complex trans-[Ru(NO)(NH3)4{P(OEt) 3}](PF6)3 undergoes nucleophilic attack on the phosphorus ester ligand in the solid state yielding trans-[Ru(NO)(NH 3)4{P(OH)(OEt)2}](PF6)3. The reaction was monitored and the products analyzed using nuclear magnetic resonance spectroscopy (31P{1H} CP-MAS NMR and 31P{1H} NMR), infrared spectroscopy (FTIR), electron paramagnetic resonance spectroscopy (EPR), cyclic voltammetry (CV), electronic spectroscopy (UV-Vis) and elemental analysis. According to experimental data and quantum mechanical calculations (DFT), the reaction proceeds in the solid state by the nucleophilic attack on the phosphorus ligand, promoted by the strong polarization along the PIII-RuII-NO+ axis induced by the nitrosyl ligand, and takes place following the Michaelis-Arbusov type mechanism for phosphorus ester hydrolysis. In solution, the nucleophilic attack occurs simultaneously at the nitrosyl and triethylphosphite ligands, yielding trans-[Ru(H2O)(NH3)4{P(OEt) 3}]2+ and trans-[Ru(NO)(H2O)(NH 3)4]3+ in comparable amounts.21712661273Lundberg, J.O., Weitzberg, E., Gladwin, M.T., (2008) Nat. Rev. Drug Discovery, 7, p. 156Li, H., Igarashi, J., Jamal, J., Yang, W., Poulos, T.L., (2006) J. Biol. Inorg. Chem., 11, p. 753Cullota, E., Koshland, J.D.E., (1992) Science, 258, p. 1862Toledo, J.C., Silva, H.A.S., Scarpellini, M., Mori, V., Camargo, A.J., Bertotti, M., Franco, D.W., (2004) Eur. J. Inorg. Chem., 9, p. 1879Tfouni, E., Krieger, M., McGarvey, B.R., Franco, D.W., (2003) Coord. Chem. Rev., 236, p. 57Clarke, M.J., (2003) Coord. Chem. Rev., 236, p. 209McCleverty, J.A., (2004) Chem. Rev., 104, p. 403Franco, D.W., Taube, H., (1978) Inorg. Chem., 17, p. 571Lopes, L.G.F., Castellano, E.E., Ferreira, A.G., Davanzo, C.U., Clarke, M.J., Franco, D.W., (2005) Inorg. Chim. Acta, 358, p. 2883Silva, J.J.N., Osakabe, A.L., Pavanelli, W.R., Silva, J.S., Franco, D.W., (2007) Br. J. Pharmacol., 152, p. 112Ishmaeva, E.A., Popova, E.V., Mironov, V.F., Aminova, R.M., Vereshchagina, Y.A., Galkin, V.I., Moeller, K., Schmutzler, R., (2004) Russ. J. Org. Chem., 40, p. 1076Doak, G.O., Freedman, L.D., (1961) Chem. Rev., 61, p. 31Corbridge, D.C.E., (1990) Phosphorus: An Outline of its Chemistry, Biochemistry and Technology, , 4th ed., Elsevier: AmsterdamKirby, A.J., Warren, S.G., (1967) The Organic Chemistry of Phosphorus, , 1st ed., Elsevier: New YorkToledo, J.C., Lima-Neto, B.S., Franco, D.W., (2005) Coord. Chem. Rev., 249, p. 419Caramori, G.F., Frenking, G., (2007) Organometalics, 26, p. 5815Bezerra, C.W.B., Silva, S.C., Gambardella, M.T.P., Santos, R.H.A., Plicas, L.M.A., Tfouni, E., Franco, D.W., (1999) Inorg. Chem., 8, p. 5660Nakamoto, K., (1986) Infrared and Raman Spectra of Inorganic and Coordination Compounds, , 4th ed., John Wiley &Sons: New YorkSocrates, G., (2001) Infrared and Raman Characteristic Group Frequencies, , 3rd ed., John Wiley &Sons: New YorkSchreiner, A.F., Lin, S.W., Hausser, P.J., Hopcus, E.A., Hamm, D.J., Gunter, J.D., (1972) Inorg. Chem., 11, p. 880Gorelsky, S.I., Silva, S.C., Lever, A.B.P., Franco, D.W., (2000) Inorg. Chim. Acta, 300, p. 698Verdake, J.G., Quin, L.D., (1987) Phophorus-31 NMR Spectroscopy on Stereochemical Analysis, , VCH Paublishers: Deerfield BeachAguiar, M.R.M.P., Gemal, A.L., Gil, R.A.S.S., (1999) Quim. Nova, 22, p. 553Penner, G.H., Wasylishen, R.E., (1989) Can. J. Chem., 67, p. 1909Moynihan, H.A., O'Hare, I.P., (2002) Int. J. Pharmam, 247, p. 179Sernaglia, R.L., Franco, D.W., (1989) Inorg. Chem., 28, p. 3485Truzzi, D.R., Franco, D.W., (2008) Abstracts of the XIV Brazilian Meeting in Inorganic Chemistry, , Foz de Iguaçu, BrazilXi, C., Liu, Y., Lai, C., Zhou, L., (2004) Inorg. Chem. Commun., 7, p. 1202Han, L.B., Tanaka, M., (1996) J. Am. Chem. Soc., 118, p. 1571Brill, T.E., Landon, S.J., (1984) Chem. Rev., 84, p. 577Bezerra, C.W.B., Silva, S.C., Gambardella, M.T.P., Santos, R.H.A., Plicas, M.L., Tfouni, E., Franco, D.W., (1999) Inorg. Chem., 38, p. 5660Koleva, G., Galabov, B., Wu, J.I., Schaefer, H.F., Schleyer, P.R., (2009) J. Am. Chem. Soc., 131, p. 14772Mazzetto, S.E., Gambardella, M.T.P., Santos, R.H.A., Lopes, L.G.F., Franco, D.W., (1999) Polyhedron., 18, p. 979Perrin, D.D., Armarego, W.L.F., (1983) Purification of Laboratory Chemicals, , 3rd ed., Pergamon Press: New YorkKolthoff, I.M., (1969) Quantitative Chemical Analysis, , 4th ed., Macmillan: New YorkShriver, D.F., Drezdzon, M.A., (1986) The Manipulation of Air-Sensitive Compounds, , 2nd ed., Wiley: New YorkFrisch, M.J., Trucks, G.W., Schlegel, H.B., Scuseria, G.E., Robb, M.A., Cheeseman, J.R., Montgomery Jr., J.A., Pople, J.A., (2004), Gaussian 03 Revision C.02WallingfordBecke, A.D., (1993) J. Chem. Phys., 98, p. 5648Farkas, O., Schlegel, H.B., (1999) J. Chem. Phys., 111, p. 10806Cances, E., Mennucci, B., Tomasi, J., (1997) J. Chem. Phys., 107, p. 3032Reed, A.E., Weinhold, F., (1985) J. Chem. Phys., 83, p. 1736Reed, A.E., Curtiss, L.A., Weinhold, F., (1988) Chem. Rev., 88, p. 899Glendening, E.D., Badenhoop, J.K., Reed, A.E., Carpenter, J.E., Weinhold, F., (1999) NBO4. MNBO Analysis Programs, , University of Wisconsin, US
Comparison Between Cachaça And Rum Using Pattern Recognition Methods
No full textThe differentiation between cachaça and rum using analytical data referred to alcohols (methanol, propanol, isobutanol, and isopentanol), acetaldehyde, ethyl acetate, organic acids (octanoic acid, decanoic acid, and dodecanoic acid), metals (Al, Ca, Co, Cu, Cr, Fe, Mg, Mn, Ni, Na, and Zn), and polyphenols (protocatechuic acid, sinapaldehyde, syringaldehyde, ellagic acid, syringic acid, gallic acid, (-)-epicatechin, vanillic acid, vanillin, p-coumaric acid, coniferaldehyde, coniferyl alcohol, kaempferol, and quercetin) is described. The organic and metal analyte contents were determined in 18 cachaça and 21 rum samples using chromatographic methods (GC-MS, GC-FID, and HPLC-UV-vis) and inductively coupled plasma atomic emission spectrometry, respectively. The analytical data of the above compounds, when treated by principal component analysis, hierarchical cluster analysis, discriminant analysis, and K-nearest neighbor analysis, provide a very good discrimination between the two classes of beverages.521134293433Vancocelos, Y., Cachaça sem mistério (2003) Pesquisa FAPESP, 87, pp. 74-77Decreto FederalBrasil N 4.072, Jan 3, 2002, Art. 91Boscolo, M., Bezerra, C.W.B., Cardoso, D.R., Lima-Neto, B.S., Franco, D.W., Identification and dosage by HRGC of minor alcohols and esters in Brazilian sugar-cane spirit (2000) J. Braz. Chem. Soc., 11, pp. 86-90Nascimento, R.F., Cardoso, D.R., Lima-Neto, B.S., Franco, D.W., Determination of acids in Brazilian sugar cane spirits and other alcoholic beverages by HRGC-SPE (1998) Chromatographia, 48 (11-12), pp. 751-758Nascimento, R.F., Cardoso, D.R., Keukeleire, D., Lima-Neto, B.S., Franco, D.W., Quantitative HPLC analysis of acids in Brazilian cachaça and various spirits using fluorescence detection of their 9-anthrylmethyl esters (2000) J. Agric. Food Chem., 48, pp. 6070-6073Bettin, S.M., Isique, W.D., Franco, D.W., Andersen, M.L., Knudsen, S., Skibsted, L.H., Phenols and metals in sugar-cane spirits. Quantitative analysis and effect on radical formation and radical scavenging (2002) Eur. Food Res. Technol., 215, pp. 169-175Nascimento, R.F., Bezerra, C.W., Furuya, S.M.B., Schultz, M.S., Polastro, L.R., Lima-Neto, B.S., Franco, D.W., Metal profiles of Brazilian cachaças and other international spirits (1999) J. Food Compos. Anal., 12, pp. 17-25Nicol, D.A., Chapter rum (2003) Fermented Beverage Production, 2nd Ed., pp. 263-287. , Lea, A. G. H., Piggott, J. R., Eds.Kluwer Academic/Plenum Plubishers: New WorkFernández, P.L., Pablos, F., Martín, M.J., González, A.G., Multi-element analysis of tea beverages by inductively coupled plasma atomic emission spectrometry (2002) Food Chem., 76, pp. 483-489Bellido-Milla, D., Moreno-Perez, J.M., Hernández-Artiga, M.P., Differentiation and classificafion of beers with flame atomic spectrometry and molecular absorption spectrometry and sample preparation assisted by microwaves (2000) Spectrochim. Acta, Part B, 55, pp. 855-864Arvanitoyannis, I.S., Katsota, M.N., Psarra, E.P., Soufleros, E.H., Kallithraka, S., Application of quality control methods for assessing wine authenticity: Use of multivariate analysis (chemometrics) (1999) Trends Food Sci. Technol., 10, pp. 321-336Pozo-Bayón, M.A., Pueyo, E., Martín-Álvarez, P.J., Polo, M.C., Polydimethylsiloxane solid-phase microextraction-gas chromatography method for the analysis of volatile compounds in wines Its application to the characterization of varietal wines (2001) J. Chromatogr., A, 922, pp. 267-275Martin, M.J., Pablos, F., González, G., Valdenebro, M.S., León-Camacho, M., Fatty acids profiles as discriminant parameters for coffee varieties differentiation (2001) Talanta, 54, pp. 291-297Valera, P., Pablos, F., González, G., Classification of tea samples by their chemical composition using discriminant analysis (1996) Talanta, 43, pp. 415-419Pet'ka, J., Mocàk, J., Farkas, P., Balla, B., Kovac, M., Classification of Slovak varietal white wines by volatile compounds (2001) J. Sci. Food Agric., 81, pp. 1533-1539Aylott, R.I., Clyne, A.H., Fox, A.P., Walker, D.A., Analytical strategies to confirm Scotch whisky authenticity (1994) Analyst, 119, pp. 1741-1746González-Arjona, D., González-Gallero, V., Pablos, F., González, A.G., Authentication and differentiation of Irish whiskeys by higher-alcohol congener analysis (1999) Anal. Chim. Acta, 381, pp. 257-264Saxberg, B.E., Duewer, D.L., Booker, J.L., Pattern recognition blind assay applied to forensic separation of whiskies (1978) Anal. Chim. Acta, 103, pp. 201-212Herranz, A., Serna, P., Barro, C., Multivariete statistical methods applied to the differentiation of rum brands (1990) J. Sci. Food Agric., 51, pp. 555-560Etiévant, P., Schlich, P., Cantagrel, R., Bertrand, A., Bouvier, J.C., Varietal and geographic classification of french red wines in terms of major acids (1989) J. Sci. Food Agric., 46, pp. 421-438Aguilar-Cisnero, B.O., López, M.G., Richling, E., Heckel, F., Schreier, P., Tequila authenticity assessment by headspace SPME-HRCG-IRMS analysis of 13C/ 12C and 18O 16O ratios of ethanol (2002) J. Agric. Food Chem., 50, pp. 7520-7523Beebe, K.R., Pell, R.J., Seasholtz, M.B., Pattern recognition (1998) Chemometrics: A Practical Guide, pp. 62-125. , Wiley: New YorkFerreira, M.M.C., Multivariate QSAR (2002) J. Braz. Chem. Soc., 13, pp. 742-753Wold, S., Josephson, M., Multivariate calibration of analytical data (2000) Encyclopedia of Analytical Chemistry, pp. 9710-9736. , Wiley: Chichester, U.
Olfactory responses of the omnivorous generalist predator Dicyphus hesperusto plant and prey odours
No full textResponses of female Dicyphus hesperus Knight (Heteroptera: Miridae) to the odours of plants and prey were tested in the laboratory using a Y-tube olfactometer. Females were attracted to the odour of tomato leaves infested with nymphs of the greenhouse whitefly, Trialeurodes vaporariorum Westwood (Homoptera: Aleyrodidae), compared to uninfested leaves. No such attraction occurred to tomato leaves infested with two-spotted spider mites, Tetranychus urticae Koch (Acari: Tetranychidae). When females were simultaneously presented with the odours of whitefly and mite-infested leaves, no preference for either odour was recorded. Similarly, females were attracted to the odour of pepper leaves infested with green peach aphids [Myzus persicae (Sulzer) (Homoptera: Aphididae)] compared to uninfested leaves, but were not attracted to the odour of pepper leaves infested with eggs of cabbage loopers, Trichoplusia ni (Hübner) (Lepidoptera: Noctuidae). When aphid-infested and looper-egg-infested pepper leaves were presented simultaneously, no preference for either odour was detected. The results are discussed as they relate to the evolution of infochemical use in generalist omnivorous predators. [ABSTRACT FROM AUTHOR]Peer reviewedfinal article publishedTrialeurodes vaporariorumMiridaeHeteropterabiological controlpeppertomatoTrichoplusia niMyzus persicaeTetranychus urtica
Prey feeding increases water stress in the omnivorous predator Dicyphus hesperus
No full textThe effects of water stress (produced by water deprivation and prey feeding) on plant feeding were investigated in the omnivorous predator Dicyphus hesperus Knight (Hemiptera: Miridae). The objective was to determine if prey feeding aggravated water deficits and thus increased plant feeding. We measured plant feeding in a factorial experiment where female D. hesperus were prepared for experiments by providing or withholding water and/or prey for 24 h. We then evaluated the amount of plant feeding on Nicotiana tabacum seedlings by the direct observation of insects at three different densities of the prey, Ephestia kuehniella eggs. The amount of plant feeding, as measured by frequency of plant feeding bouts and time spent plant feeding during observation, was significantly greater for water-deprived individuals than for those that had been provided with water. Individuals that had been provided with prey fed on plants at a significantly higher frequency than prey-deprived individuals at two of the prey densities used in the experiment. These results support the hypothesis that plant feeding in zoophytophagous Hemiptera facilitates prey feeding by providing water that is essential for predation. [ABSTRACT FROM AUTHOR]Peer reviewedFinal article publishedMiridaezoophytophagous predatortomatoplant feedingomnivorygeneralist predatorDicyphus hesperusbiological controlHeteropter
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