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1

Enantioselective Hydroformylation of Aniline Derivatives  

PubMed Central

We have developed a ligand that reversibly binds to aniline substrates allowing for the control of regioselectivity and enantioselectivity in hydroformylation. In this paper we address how the electronics of the aniline ring affect both binding of the substrate to the ligand and the enantioselectivity in this reaction. PMID:21842847

Joe, Candice L.; Tan, Kian L.

2011-01-01

2

Evaluation of Polymer-Supported Rhodium Catalysts in 1-Octene Hydroformylation in Supercritical Carbon Dioxide  

E-print Network

, reactivity, and stabil- ity. Hydroformylation (the oxo reaction) is usually carried out in the liquid phase, eliminating problems associated with mass-transfer limitations when the reaction is carried in a liquid. There has been an increasing interest in homogeneous catalysis using scCO2 as an environ- mentally benign

Abdou, Hanan E.

3

Greener Hydroformylation with Nanofilterable Rhodium Catalysts in A Stirred Membrane Reactor  

E-print Network

involving gas-expanded liquids and nanofilterable catalysts with potential for practical viability. It has been shown by previous researchers in our group that the use of simple homogeneous Rh/TPP catalyst for 1-octene hydroformylation in CO2-expanded liquid...

Xie, Zhuanzhuan

2013-05-31

4

SOLUBILITIES OF CO AND H2 IN NEAT AND CO2-EXPANDED HYDROFORMYLATION REACTION MIXTURES CONTAINING 1-OCTENE AND NONANAL UP TO 80 °C AND 90 BARS  

E-print Network

Accurate knowledge of the phase equilibria of CO2-expanded hydroformylation reaction mixtures is essential to rational process design and development. Vapor liquid equilibria of the following systems were measured in a variable volume view cell...

Xie, Zhuanzhuan

2009-01-01

5

Rh-catalyzed linear hydroformylation of styrene.  

PubMed

Usually the Rh-catalyzed hydroformylation of styrene predominantly yields the branched, chiral aldehyde. An inversion of regioselectivity can be achieved using strong ?-acceptor ligands. Binaphthol-based diphosphite and bis(dipyrrolyl-phosphorodiamidite) ligands were applied in the Rh-catalyzed hydroformylation of styrene. High selectivities up to 83% of 3-phenylpropanal were obtained with 1,1-bi-2-naphthol-based bis(dipyrrolyl-phosphorodiamidite) with virtually no hydrogenation to ethyl benzene. The coordination chemistry of those ligands towards Rh(I) was investigated spectroscopically and structurally. PMID:23104326

Boymans, Evert; Janssen, Michèle; Müller, Christian; Lutz, Martin; Vogt, Dieter

2013-01-01

6

Highly regioselective hydroformylation with hemispherical chelators.  

PubMed

The hemispherical diphosphites (R,R)- or (S,S)-5,11,17,23-tetra-tert-butyl-25,27-di(OR)-26,28-bis(1,1'-binaphthyl-2,2'-dioxyphosphanyloxy)calix[4]arene (R=OPr, OCH(2)Ph, OCH(2)-naphtyl, O-fluorenyl; R=H, R'=OPr) (L(R)), all with C(2) symmetry, have been synthesised starting from the appropriate di-O-alkylated calix[4]arene precursor. In the presence of [Rh(acac)(CO)(2)], these ligands straightforwardly provide chelate complexes in which the metal centre sits in a molecular pocket defined by two naphthyl planes related by the C(2) axis and the two apically situated R groups. Hydroformylation of octene with the L(Pr)/Rh system turned out to be highly regioselective, the linear-to-branched (l:b) aldehyde ratio reaching 58:1. The l:b ratio significantly increased when the propyl groups were replaced by -CH(2)Ph (l:b=80) or -CH(2)naphthyl (l:b=100) groups, that is, with substituents able to sterically interact with the apical metal sites, but without inducing an opening of the cleft nesting the catalytic centre. The trend to preferentially form the aldehyde the shape of which fits with the shape of the catalytic pocket was further confirmed in the hydroformylation of styrene, for which, in contrast to catalysis with conventional diphosphanes, the linear aldehyde was the major product (up to ca. 75 % linear aldehyde). In the hydroformylation of trans-2-octene with the L(benzyl)/Rh system, combined isomerisation/hydroformylation led to a remarkably high l:b aldehyde ratios of 25, thus showing that isomerisation is more effective than hydroformylation. Unusually large amounts of linear products were also observed with all the above diphosphites in the tandem hydroformylation/amination of styrene (l:b of ca. 3:1) as well as in the hydroformylation of allyl benzyl ether (l:b ratio up to 20). PMID:18686280

Sémeril, David; Matt, Dominique; Toupet, Loïc

2008-01-01

7

Hydroformylation: An Old Yet New Industrial Route to Alcohols.  

ERIC Educational Resources Information Center

Discusses trends in hydroformylation chemistry, considering these catalysis and ligands: (1) cobalt, (2) cobalt-phosphine, and (3) rhodium-phosphine. Indicates that rhodium technology will grow in domination of hydroformylation practice. In addition, processes adapted to special cases of functional olefins and to higher olefins can be expected.…

Pruett, Roy L.

1986-01-01

8

Self-regulation effect in the hydroformylation reaction of olefins  

Microsoft Academic Search

It has been demonstrated that under the conditions of vigorous olefin hydroformylation, stabilization and even partial regeneration of the activity of the rhodium carbonyl catalyst, deactivated by the formation of the polynuclear carbonyl clusters, are observed. The accumulation of a superequilibrium concentration of active rhodium carbonyl catalyst species, which are labile and thermodynamically unstable outside of the catalysis conditions, is

Yu. B. Kagan; A. Ya. Rozovskii; E. V. Slivinskii; G. A. Korneeva; V. I. Kurkin; S. M. Loktev

1988-01-01

9

A Hybrid Phosphorus Ligand for Highly Enantioselective Asymmetric Hydroformylation  

E-print Network

with relatively low reaction rate and low conversion. This limits the utilities of this important transformation derivatives and vinyl acetate. Introduction Hydroformylation is the reaction of alkenes with carbon monoxide an acceptable reaction rate. However, high enantioselectivities are generally observed at low temperature

Zhang, Xumu

10

SPECTRE DES FLUCTUATIONS THERMIQUES A LA SURFACE LIBRE D'UN CRISTAL LIQUIDE NMATIQUE  

E-print Network

liquide. Abstract. 2014 We derive the power spectrum for thermal fluctuations of the free surface of a nematic liquid crystal in a magnetic field, using the fluctuation-dissipation theorem and the Eriksen101 SPECTRE DES FLUCTUATIONS THERMIQUES A LA SURFACE LIBRE D'UN CRISTAL LIQUIDE NÃ?MATIQUE D

Paris-Sud XI, Université de

11

TUDE EXPRIMENTALE DES COURANTS DE CONVECTION DANS UNE NAPPE LIQUIDE. 2014 RGIME PERMANENT : TOURBILLONS CELLULAIRES;  

E-print Network

513 �TUDE EXP�RIMENTALE DES COURANTS DE CONVECTION DANS UNE NAPPE LIQUIDE. 2014 R�GIME PERMANENT convection dans une nappe liquide horizontale : seulement ce sera dans toute l'étendue de la surface de vertical uniforme. Quant à la surface de niveau supérieure de la nappe liquide, on est obligé, pour pouvoir

Paris-Sud XI, Université de

12

Chemical transformations during rectification of products of hydroformylation of propylene  

SciTech Connect

The occurrence of reactions related to losses of the target products, aldehydes and alcohols, was established in continuous rectification of the products of hydroformylation of propylene. The sections of the zone of primary occurrence of the reactions of aldol condensation, formation of acetals, and esterification of butyl alcohols with butyric acids were determined in the rectification column. It was shown that with increase in temperature in the rectification column still the degree of aldehyde and alcohol conversion in the overall rectification system decreases with respect to aldol condensation and acetal formation, while increasing with respect to alcohol esterification.

Kuz'mina, L.S.; Maiorova, L.V.; Kharisov, M.A.

1988-09-10

13

Hydroformylation of naphthas with a rhodium complex in biphasic medium  

Microsoft Academic Search

The chlorocarbonyl bis-[butylphenyl (meta-sulfonate-phenyl)phosphine] rhodium (I) complex shows catalytic hydroformylation\\u000a activity in toluene\\/water biphasic medium for 1-hexene, cyclohexene, 2,3-dimethyl-2-butene and 2-methyl-2-pentene, their binary\\u000a mixtures and a real Venezuelan naphtha, under standardized reaction conditions (1000 psi of syngas (1:1 H2\\/CO), 100C, substrate\\/catalyst molar ratio (600:1) and 4 h reaction time), obtaining high percent conversion to oxygenated\\u000a products.

Marisela Reyes; Daniel Mercades; Bernardo Fontal; Trino Suárez; Fernando Bellandi; Ricardo R. Contreras; Isolda Romero; Yuraima Fonseca; Pedro Cancines

2007-01-01

14

Enantioselective Hydroformylation of N-Vinyl Carboxamides, Allyl Carbamates and Allyl Ethers Using Chiral Diazaphospholane Ligands  

PubMed Central

Rhodium complexes of diazaphospholane ligands catalyze the asymmetric hydroformylation of N-vinyl carboxamides, allyl ethers and allyl carbamates; products include 1,2- and 1,3-amino aldehydes and 1,3-alkoxy aldehydes. Using glass pressure bottles, short reaction times (generally less than 6 hours), and low catalyst loading (commonly 0.5 mol %), 20 substrates are successfully converted to chiral aldehydes with useful regioselectivity and high enantioselectivity (up to 99% ee). Chiral Roche aldehyde is obtained with 97% ee from the hydroformylation of allyl silyl ethers. Commonly difficult substrates such as 1,1- and 1,2-disubstituted alkenes undergo effective hydroformylation with greater than 89% ee and complete conversion for six examples. Palladium-catalyzed aerobic oxidative amination of allyl benzyl ether followed by enantioselective hydroformylation yields the ?3-aminoaldehyde with 74% ee. PMID:20845958

McDonald, Richard I.; Wong, Gene W.; Neupane, Ram P.; Stahl, Shannon S.; Landis, Clark R.

2010-01-01

15

Rhodium/phospholane-phosphite catalysts give unusually high regioselectivity in the enantioselective hydroformylation of vinyl arenes.  

PubMed

Using the phospholane-phosphite ligand, BOBPHOS, almost perfect regioselectivities and high enantioselectivities (up to 92% ee) are observed in Rh catalysed enantioselective hydroformylation of vinyl arenes. This can be achieved under solvent-free conditions. PMID:24362887

Noonan, Gary M; Cobley, Christopher J; Mahoney, Thomas; Clarke, Matthew L

2014-02-11

16

Novel synthesis of modified tetraphosphine ligands for bimetallic hydroformylation catalysis  

SciTech Connect

Bimetallic rhodium complexes based on the novel binucleating tatraphosphine ligand system racemic-Et{sub 2}PCH{sub 2}CH{sub 2}P(Ph)CH{sub 2}P(Ph)CH{sub 2}CH{sub 2}PEt{sub 2}, et,ph-P4, are highly active and selective hydroformylation catalysts that make use of bimetallic cooperativity to operate. The versatility of the previously reported hydroformylation ligand (et,ph-P4) has been expanded by changing the substituents on the internal phosphorus atoms. This was made possible by the ability to synthesize a variety of substituted methylene bridges of the type (H)RPCH{sub 2}PR(H). These were made by employing a new Grignard-like synthesis with bis(dichlorophosphine)methane (Cl{sub 2}PCH{sub 2}PCl{sub 2}). This new Grignard-like chemistry has also allowed us to synthesize, cleanly and quantitatively, previously unattainable disubstituted alkyl phosphines of the type P(H)R{sub 2} and P(Cl)R{sub 2}.

Koch, H.F.; Misquitta, B.J.; Stanley, G.G. [Louisiana State Univ., Baton Rouge, LA (United States)

1996-10-01

17

Confining phosphanes derived from cyclodextrins for efficient regio- and enantioselective hydroformylation.  

PubMed

Two confining phosphane ligands derived from either ?- or ?-cyclodextrin produce singly P(III) -ligated metal complexes with unusual coordination spheres. High-pressure NMR studies have revealed that rhodium hydride complexes of the same type are also formed under hydroformylation conditions. This unique feature strongly favors the formation of the branched aldehyde at the expense of the linear one with high enantioselectivity in the rhodium-catalyzed hydroformylation of styrene. PMID:24590681

Jouffroy, Matthieu; Gramage-Doria, Rafael; Armspach, Dominique; Sémeril, David; Oberhauser, Werner; Matt, Dominique; Toupet, Loic

2014-04-01

18

Capsule-controlled selectivity of a rhodium hydroformylation catalyst  

NASA Astrophysics Data System (ADS)

Chemical processes proceed much faster and more selectively in the presence of appropriate catalysts, and as such the field of catalysis is of key importance for the chemical industry, especially in light of sustainable chemistry. Enzymes, the natural catalysts, are generally orders of magnitude more selective than synthetic catalysts and a major difference is that they take advantage of well-defined cavities around the active site to steer the selectivity of a reaction via the second coordination sphere. Here we demonstrate that such a strategy also applies for a rhodium catalyst; when used in the hydroformylation of internal alkenes, the selectivity of the product formed is steered solely by changing the cavity surrounding the metal complex. Detailed studies reveal that the origin of the capsule-controlled selectivity is the capsule reorganization energy, that is, the high energy required to accommodate the hydride migration transition state, which leads to the minor product.

Bocoki?, Vladica; Kalkan, Ayfer; Lutz, Martin; Spek, Anthony L.; Gryko, Daniel T.; Reek, Joost N. H.

2013-10-01

19

L'ionisation des carbures d'hydrogne liquides1 Par TchesJas BIALOBJESKI  

E-print Network

293 L'ionisation des carbures d'hydrogène liquides1 Par TchesJas BIALOBJESKI [Laboratoire de physique de l'Université de Kiew.] 1. Introduction. - Les carbures d'hydrogène, dont: nous nous occtapcrons

Boyer, Edmond

20

Facile catalyst separation without water: fluorous biphase hydroformylation of olefins.  

PubMed

A novel concept for performing stoichiometric and catalytic chemical transformations has been developed that is based on the limited miscibility of partially or fully fluorinated compounds with nonfluorinated compounds. A fluorous biphase system (FBS) consists of a fluorous phase containing a dissolved reagent or catalyst and another phase, which could be any common organic or nonorganic solvent with limited or no solubility in the fluorous phase. The fluorous phase is defined as the fluorocarbon (mostly perfluorinated alkanes, ethers, and tertiary amines)-rich phase of a biphase system. An FBS compatible reagent or catalyst contains enough fluorous moieties that it will be soluble only or preferentially in the fluorous phase. The most effective fluorous moieties are linear or branched perfluoroalkyl chains with high carbon number; they may also contain heteroatoms. The chemical transformation may occur either in the fluorous phase or at the interface of the two phases. The application of FBS has been demonstrated for the extraction of rhodium from toluene and for the hydroformylation of olefins. The ability to separate a catalyst or a reagent from the products completely at mild conditions could lead to industrial application of homogeneous catalysts or reagents and to the development of more environmentally benign processes. PMID:17814001

Horváth, I T; Rábai, J

1994-10-01

21

Hydroformylation of olefins with formaldehyde in the presence of RhHCO(PPh 3) 3  

Microsoft Academic Search

Olefins, such as allyl alcohol, propylene, 1-hexene, styrene, methyl acrylate and acrolein, were hydroformylated with formaldehyde to form corresponding aldehydes. Allyl alcohol and methyl acrylate which have oxygen at ? position to double bond showed higher reactivities and selectivities to n-products than those of olefins without oxygen such as propylene, 1-hexene and styrene. 4-Hydroxybutanal was formed as a major product

Hong Sang Ahn; Sung Hwan Han; Sung Jin Uhm; Won Kyung Seok; Heung Nae Lee; G. A. Korneeva

1999-01-01

22

Domino hydroformylation/aldol condensation/hydrogenation catalysis: highly selective synthesis of ketones from olefins.  

PubMed

A general and highly chemo- and regioselective synthesis of ketones from olefins by domino hydroformylation/aldol condensation/hydrogenation reaction has been developed. A variety of olefins are efficiently converted into various ketones in good to excellent yields and regioselectivities in the presence of a specific rhodium phosphine/base-acid catalyst system. PMID:25331557

Fang, Xianjie; Jackstell, Ralf; Börner, Armin; Beller, Matthias

2014-11-24

23

Application de la topologie moléculaire à la prédiction de la viscosité liquide des composés organiques  

NASA Astrophysics Data System (ADS)

Molecular Topology has been applied to search for a mathematical model able to predict liquid viscosity values for an extensive group of organic compounds with C, H, O, N, S and halogenous atoms. The topological descriptors we have used are the connectivity indices from Kier et Hall -up to fourth order-, and the electrotopological indices. Quality of regression equation finally selected has been evaluated by a crossvalidation study. Viscosity of all compounds excepted 1,1,2-trichlorotrifluoro etane is correctly predicted by the model proposed. Nous avons appliqué la topologie moléculaire à la recherche d'un modèle mathématique capable de prédire la viscosité liquide d'un large groupe de composés organiques contenant C, H, O, N, S et des halogènes. Les descripteurs topologiques utilisés pour cette étude des relations quantitatives structure-propiété, R.Q.S.P., sont les indices de connectivité de Kier et Hall -jusqu'à l'ordre quatre- ainsi que les indices atomiques électrotopologiques. La qualité de l'équation de régression multilinéaire obtenue (aussi dite “fonction de connectivité") a été évaluée par une étude de validation croisée. Tous les composés excepté le 1,1,2-trichlorotrifluoréthane s'ajustent au modèle proposé.

García-Domenech, R.; Villanueva, A.; Gálvez, J.; Gozalbes, R.

1999-07-01

24

Promoting effects of Se on Rh/ZrO sub 2 catalysis for ethene hydroformylation  

SciTech Connect

The positive effects of Se added to Rh/ZrO{sub 2} catalysts in ethene hydroformylation were studied from the viewpoints of promoter effects of electronegative atoms usually regarded as poisoning atoms as well as electronic interactions with both substrate metal and adsorbed species. Se-modified Rh/ZrO{sub 2} catalysts prepared by the reactive deposition of (CH{sub 3}){sub 2}Se or coimpregnation method using SeO{sub 2} were found to be active and selective for ethene hydroformylation. The Se addition promoted the formation of propanol rather than propanal, the propanol formation being increased more than 70 times at an optimum {number sign} Se/Rh ratio. The propanoyl intermediates were observed at ca. 1770 cm{sup {minus}1} and converted reversibly to propionate species (bridge and digentate) observed at 1425-1575 cm{sup {minus}1}. The ensemble of Se{sup 2{minus}}/Rh was suggested to promote CO adsorption and the insertion of CO to ethyl species, where there is an electronic interaction between Se{sup 2{minus}} and CO or propanoyl species. The isotope effects of D{sub 2} and {sup 13}C{sup 18}O showed the switchover of the rate-determining step for hydroformylation from the CO insertion on the Rh/ZrO{sub 2} catalysts to the dissociative adsorption of H{sub 2} on the Se-Rh/ZrO{sub 2} catalysts. The role of Se is discussed in relation with the reaction mechanism.

Izumi, Y.; Asakura, K.; Iwasawa Y. (Univ. of Tokyo (Japan))

1991-02-01

25

Small bite-angle P-OP ligands for asymmetric hydroformylation and hydrogenation.  

PubMed

A series of small bite-angle phosphine-phosphite (P-OP) ligands have been synthesized by a two-step method. The key intermediate was prepared by an unprecedented asymmetric carbonyl reduction of a phosphamide using the CBS (Corey-Bakshi-Shibata) catalyst. The topology of these ligands (a configurationally stable stereogenic carbon with two heteroatom substituents) and their small bite-angle (created by the close proximity of the two ligating groups to the metal center) together provide a rigid asymmetric environment around this center, enabling high stereoselectivity in hydroformylations and hydrogenations of standard substrates. PMID:23815635

Fernández-Pérez, Héctor; Benet-Buchholz, J; Vidal-Ferran, Anton

2013-07-19

26

Domino-Hydroformylation/Aldol Condensation Catalysis: Highly Selective Synthesis of ?,?-Unsaturated Aldehydes from Olefins.  

PubMed

A general and highly chemo-, regio-, and stereoselective synthesis of ?,?-unsaturated aldehydes by a domino hydroformylation/aldol condensation reaction has been developed. A variety of olefins and aromatic aldehydes were efficiently converted into various substituted ?,?-unsaturated aldehydes in good to excellent yields in the presence of a rhodium phosphine/acid-base catalyst system. In view of the easy availability of the substrates, the high atom-efficiency, the excellent selectivity, and the mild conditions, this method is expected to complement current methodologies for the preparation of ?,?-unsaturated aldehydes. PMID:25179918

Fang, Xianjie; Jackstell, Ralf; Franke, Robert; Beller, Matthias

2014-10-01

27

Notes sur les recherches de M. T. Bialobjeski: L'ionisation des carbures d'hydrogne liquides  

E-print Network

153 Notes sur les recherches de M. T. Bialobjeski: « L'ionisation des carbures d'hydrogène liquides carbures d'hydrogène. Il se sert pour cela de résultats relatifs à une épaisseur de 2 min. J'ai essayé d

Boyer, Edmond

28

Homogeneous, single-phase hydroformylation of olefins using ionic phosphines and novel catalyst/product separation  

SciTech Connect

A high efficiency low pressure hydroformylation process for higher molecular weight olefins has been developed using rhodium/ionic phosphine catalyst. Catalyst solubilization in the non-polar reactants and products is achieved using specialized solubilizing agents, such as N-methyl pyrrolidone (NMP), yielding single-phase systems. Separation of catalyst from product is induced by the addition of small amounts of water outside the hydroformylation reactor. Under the two-phase conditions, most of the catalyst components are found in the polar NMP/water phase, and the products (aldehydes, olefins, reaction byproducts) in a separate, non-polar, phase. The catalyst phase is recycled to the reactors after thorough drying to ensure a single homogeneous phase at reaction conditions. Traces of catalyst and solubilizing agent are effectively recovered from the product and recycled. A major advantage of this process, over water-based two-phase systems, is the high catalytic reactivities and concomitant high olefin efficiencies (>90%) which are achieved with olefins of low, water solubility.

Abatjoglou, A.G.; Peterson, R.R.; Bryant, D.R. [Union Carbide Technical Center, South Charleston, WV (United States)

1995-12-01

29

Aqueous biphasic olefin hydroformylation catalyzed by water-soluble rhodium complexes  

Microsoft Academic Search

Catalysis with water-soluble rhodium complexes, RhCl(CO)(TPPMS)2, [TPPMS = P(C6H5)2(C6H4SO3)] (1), RhCl(CO)(TPPDS)2, [TPPDS = P(C6H5)(C6H4SO3)2] (2) and RhCl(CO)(TPPTS)2, [TPPTS = P(C6H4SO3)3] (3) in hydroformylation of 1-hexene, 2-pentene, 2,3-dimethyl-1-butene, cyclohexene and several mixtures of these olefins have\\u000a been studied, under moderate reaction conditions (T: 50–150 C; pCO\\/pH2 = 1; total p: 14–68 bar; Substrate\\/Catalyst: 600\\/1) in biphasic toluene\\/water media. The catalytic system shows high activity\\u000a but low selectivity. The linear and branched

Trino Suárez; Bernardo Fontal; Gustavo León; Marisela Reyes; Fernando Bellandi; Ricardo R. Contreras; Pedro Cancines

2006-01-01

30

Expanded scope of supported aqueous phase catalysis: Efficient rhodium-catalyzed hydroformylation of {alpha},{beta}-unsaturated esters  

SciTech Connect

The use of supported aqueous-phase (SAP) catalysts for the rhodium-based hydroformylation of methyl acrylate leads under optimal conditions to much higher activities than those observed under comparable homogeneous and biphasic conditions. The results obtained with a series of acrylic esters are found to be dependent on the water content of the solid support and on the solubility of the functionalized olefin in water. For soluble organic reactants, like methyl acrylate, optimal activities are obtained for fully filled pore volume materials. For less soluble organic reactants, like butyl acrylate, hydroformylations are best achieved with a lower degree of pore filling, strictly dependent on the nature of the functionalized olefin. It is assumed that the reaction of hydrophilic olefins occurs mainly in the homogeneous water film dispersed over the solid support, whilst that of lipophilic olefins takes place at the interface between the organic phase and the aqueous film. The effects of temperature and the nature of the solid support are reported. Experiments are described that indicate that the surface area and the chemical nature of the solid play a major role on the activity of the SAP catalyst, whilst the pore diameter has almost no influence. However, a decrease in the activity of methyl acrylate hydroformylation was observed upon recycling of the SAPC materials, which was attributed to the leaching of rhodium into the organic phase and the gradual dehydration of silica. 24 refs., 8 figs., 3 tabs.

Fremy, G.; Carpentier, J.F.; Mortreux, A. [Laboratoire de Catalyse Heterogene et Homogene, Villeneuve d` Ascq (France)] [and others] [Laboratoire de Catalyse Heterogene et Homogene, Villeneuve d` Ascq (France); and others

1996-09-01

31

Th`ese de Doctorat de l'Universite Paris 6 Specialite : Physique des Liquides  

E-print Network

soutenance de th`ese. Comme toute histoire a un d´ebut, je dois mon int´er^et pour la science des int´er^et pour la science des milieux granulaires. J'emprunte le r´ecit suivant `a un autre t. Lorsque l'amplitude des oscillations d´epassa un certain seuil, le sable s'anima et forma spontan´ement un

Paris-Sud XI, Université de

32

Development of a ruthenium/phosphite catalyst system for domino hydroformylation-reduction of olefins with carbon dioxide.  

PubMed

An efficient domino ruthenium-catalyzed reverse water-gas-shift (RWGS)-hydroformylation-reduction reaction of olefins to alcohols is reported. Key to success is the use of specific bulky phosphite ligands and triruthenium dodecacarbonyl as the catalyst. Compared to the known ruthenium/chloride system, the new catalyst allows for a more efficient hydrohydroxymethylation of terminal and internal olefins with carbon dioxide at lower temperature. Unwanted hydrogenation of the substrate is prevented. Preliminary mechanism investigations uncovered the homogeneous nature of the active catalyst and the influence of the ligand and additive in individual steps of the reaction sequence. PMID:24811949

Liu, Qiang; Wu, Lipeng; Fleischer, Ivana; Selent, Detlef; Franke, Robert; Jackstell, Ralf; Beller, Matthias

2014-06-01

33

Towards a Benign and Viable Rhodium Catalyzed Hydroformylation of Higher Olefins: Economic and Environmental Impact Analyses, Solvent Effects and Membrane-based Catalyst Separation  

E-print Network

analysis, were on the order of a few tens of ppb. During continuous 1-octene hydroformylation studies in the membrane reactor at a syngas pressure of 0.6 MPa and 60 °C, the 1-octene conversion and product (mostly aldehydes) concentrations reached a steady...

Fang, Jing

2009-04-28

34

Process for the hydroformylation of sulfur-containing thermally cracked petroleum residue and novel products thereof  

SciTech Connect

This patent describes a hydroformylation-hydrogenation process comprising reacting an olefinic cracked petroleum distillate feed, produced from petroleum residue by high temperature thermal cracking, and containing C{sub 5} to C{sub 35}-1-n-alkyl olefins as the major type of olefin components, and organic sulfur compounds in concentrations exceeding 0.1% sulfur. It comprises at first with carbon monoxide and hydrogen at temperatures between about 50 and 250{degrees} C and pressures in the range of 50 to 6000 psi; in the presence of a Group VIII transition metal carbonyl complex catalyst in effective amounts to produce aldehydes of a semilinear character having an average of less than one alkyl branch per molecule and 20% by weight or more linear isomers, then with molecular hydrogen at temperatures between 100 and 250{degrees} C and pressures between 200 psi and 5000 psi (13.6 and 340 atm) in the presence of a hydrogenation catalyst in effective amounts the catalyst being sulfur resistant cobalt, molybdenum, nickel, or tungsten or a sulfide thereof to produce the corresponding alcohols of a semilinear character having an average of less than one alkyl branch per molecule and 20% by weight or more linear isomers, then with molecular hydrogen at temperatures between 100 and 250{degrees} C and pressures between 200 psi and 5000 psi (13.6 and 340 atm) in the presence of a hydrogenation catalyst in effective amounts the catalyst being sulfur resistant cobalt, molybdenum, nickel, or tungsten or a sulfide thereof to produce the corresponding alcohols of a semilinear character having an average of less than one alkyl branch per molecule.

Oswald, A.A.; Bhatia, R.N.; Mozeleski, E.J.; Glivicky, A.P.; Brueggeman, B.G.; Hooten, J.R.; Smith, C.M.; Hsu, C.S.

1991-07-09

35

Enantiopure Narrow Bite-Angle P?OP Ligands: Synthesis and Catalytic Performance in Asymmetric Hydroformylations and Hydrogenations.  

PubMed

Herein is reported the preparation of a set of narrow bite-angle P-OP ligands the backbone of which contains a stereogenic carbon atom. The synthesis was based on a Corey-Bakshi-Shibata (CBS)-catalyzed asymmetric reduction of phosphomides. The structure of the resulting 1,1-P-OP ligands, which was selectively tuned through adequate combination of the configuration of the stereogenic carbon atom, its substituent, and the phosphite fragment, proved crucial for providing a rigid environment around the metal center, as evidenced by X-ray crystallography. These new ligands enabled very good catalytic properties in the Rh-mediated enantioselective hydrogenation and hydroformylation of challenging and model substrates (up to 99?%?ee). Whereas for asymmetric hydrogenation the optimal P-OP ligand depended on the substrate, for hydroformylation, a single ligand was the highest-performing one for almost all studied substrates: it contains an R-configured stereogenic carbon atom between the two phosphorus ligating groups, and an S-configured 3,3'-diphenyl-substituted biaryl unit. PMID:25335770

Fernández-Pérez, Héctor; Benet-Buchholz, Jordi; Vidal-Ferran, Anton

2014-11-17

36

Les proprits cristal-liquides des argiles et d'autres systmes de feuillets minraux  

E-print Network

).) Exemples de cristaux liquides minéraux #12;7 Suspensions aqueuses de nanoparticules d'argiles - Laponite laponite Capillaire optique de suspension de laponite 0.034 g.cm-3 Gabriel JCP et al, J. Phys. Chem. 100 polarisée Bentonite 0.044 g.cm-3 Bentonite 0.053 g.cm-3 Laponite 0.065 g.cm-3 Laponite 0.034 g.cm-3 J

Paris-Sud 11, Université de

37

An operando FTIR spectroscopic and kinetic study of carbon monoxide pressure influence on rhodium-catalyzed olefin hydroformylation.  

PubMed

The influence of carbon monoxide concentration on the kinetics of the hydroformylation of 3,3-dimethyl-1-butene with a phosphite-modified rhodium catalyst has been studied for the pressure range p(CO)=0.20-3.83?MPa. Highly resolved time-dependent concentration profiles of the organometallic intermediates were derived from IR spectroscopic data collected in situ for the entire olefin-conversion range. The dynamics of the catalyst and organic components are described by enzyme-type kinetics with competitive and uncompetitive inhibition reactions involving carbon monoxide taken into account. Saturation of the alkyl-rhodium intermediates with carbon monoxide as a cosubstrate occurs between 1.5 and 2?MPa of carbon monoxide pressure, which brings about a convergence of aldehyde regioselectivity. Hydrogenolysis of the acyl intermediate is fast at 30?°C and low pressure of p(CO)=0.2?MPa, but is of minus first order with respect to the solution concentration of carbon monoxide. Resting 18-electron hydrido and acyl complexes that correspond to early and late rate-determining states, respectively, coexist as long as the conversion of the substrate is not complete. PMID:25081298

Kubis, Christoph; Sawall, Mathias; Block, Axel; Neymeyr, Klaus; Ludwig, Ralf; Börner, Armin; Selent, Detlef

2014-09-01

38

Hydroformylation reactions of the trans Mo(CO) 4 ( p -C 5 NH 4 SO 3 NA) 2 complex in biphasic medium  

Microsoft Academic Search

Trans-bis(sodium pyridine-p-sulphonate)tetracarbonylmolybdenum(0) complex, (trans-Mo(CO)4(p-PySO3Na)2, (1)) was used as a catalytic precursor for the 1-hexene hydroformylation reaction, in biphasic toluene\\/water medium (T =\\u000a 100°C, syngas total pressure = 600 psi, pH2\\/pCO = 1). Complex (1) showed good activity favoring the linear aldehyde. Likewise as other organic olefin substrates and\\u000a with synthetic and real naphtha, good conversions to oxygenated products were obtained.

Trino Suárez; Bernardo Fontal; Ghery Zambrano; Marisela Reyes; Fernando Bellandi; Ricardo R. Contreras; Juan C. Diaz; Pedro Cancines; Yuraima Fonseca; Isolda Romero

2008-01-01

39

Asymmetric Hydroformylation Catalyzed by RhH(CO)2[(R,S)-Yanphos]: Mechanism and Origin of Enantioselectivity.  

PubMed

Asymmetric hydroformylation (AHF) catalyzed by transition metal (TM) complexes bearing chiral phosphorus ligands is one of the most powerful synthetic ways that could provide chiral aldehydes directly from alkenes and syngas in one step. Experiments have proved the efficiency of Rh catalyst with hybrid phosphorus ligands owning two different phosphorus moieties in AHF. Herein the origin of enantioselectivity of AHF catalyzed by RhH(CO)2[(R,S)-Yanphos] was studied at M06/BSI level using the density functional theory (DFT) method to unveil a fundamental understanding on factors contributing to the efficiency in AHF. The alkene insertion step is supposed to be the chirality-determining step in the whole catalytic cycle of the Rh-Yanphos system. Four possible pathways of styrene (Sub1) insertion step (pathways R1, S1, R2, and S2) were discussed; the calculated results indicate that pathways R1 and S2 are proposed to be two dominant alkene insertion pathways and that styrene tends to adopt apical coordination mode (A mode) to Rh center in pathways R1 and S2 compared to equatorial coordination mode (E mode) in pathways R2 and S1. The enantioselectivity of AHFs of ten alkene substrates (CH2?CH-R, R?Ph, C(?O)OCH3, Ph-(p)-Me, Ph-(p)-OMe, Ph-(p)-(i)Bu, Ph-(p)-F, Ph-(p)-Cl, Ph-(o)-F, OC(?O)-Ph and O-Ph, corresponding alkenes are abbreviated as Sub1 to Sub10, respectively) were also investigated. The predicted chiralities agree well with experimental results. The present work suggests that the relative stabilities of coordination modes (A/E mode) of alkene to 2 (RhH(CO)[(R,S)-Yanphos]) might be of importance in the enantioselectivity of AHF catalyzed by Rh-Yanphos. PMID:24735053

Lei, Ming; Wang, Zhidong; Du, Xiaojie; Zhang, Xin; Tang, Yanhui

2014-10-01

40

Revue et discussion à propos des diverses techniques de préparation des colonnes pour la chromatographie en phase liquide à haute performance  

Microsoft Academic Search

The use of columns packed with small particles (diameters between 5 and 20 ?m) has become widespread in liquid chromatography. These columns allow the achievement of remarkably high performances. They cannot be packed by the old conventional, dry-packing methods because the small particles agglomerate to larger ones, which has a catastrophic effect on the efficiency. It becomes necessaryto use wet

M. Martin; G. Guiochon

1977-01-01

41

Bis-phosphites and bis-phosphinites based on distally-functionalised calix[4]arenes: coordination chemistry and use in rhodium-catalysed, low-pressure olefin hydroformylation.  

PubMed

Six calix[4]arenes each bearing two non-cyclic PR2 units attached at distal phenolic oxygen atoms, p-Bu t-calix[4]arene-25,27-(OPR2)2-26,28-(OR')2(R = OPh; R'= Prn, L1; R = OPh; R'= CH2CO2Et, L2; R= OPh; R'= CO2 cholesteryl, L3; R = Ph; R'= Prn, 4; R = Ph; R'= CH2CO2Et, L5; R = Ph; R'= CO2cholesteryl, L6) have been synthesized and their coordinative properties investigated. The diphosphites L1-L3, where the P centres are separated by 12 bonds, readily form chelate complexes provided the complexation reaction is achieved either by using a starting complex that possesses good leaving groups or by operating under high dilution in order to avoid oligomer formation. Thus, the cationic complexes [Rh(COD)L1]BF4 and [Rh(COD)L3]BF4 were both formed in high yield by reacting the appropriate diphosphite with either [Rh(COD)(THF)2]BF4 or [Rh(COD)2]BF4. At high dilution, reaction of L3 with the neutral complex [PdCl2(COD)] afforded the chelate complex [PdCl2L3] in 90% yield. The reaction of one equiv. of L1 with [Rh(acac)(CO)2] resulted in the formation of [Rh(acac)L1] without requiring high dilution conditions. When the latter reaction was carried out with 0.5 equiv. of L1, the bimetallic complex [{Rh(acac)(CO)}2(eta]1-P,eta1-P'-L1)] was formed instead. Reaction at high dilution of with the cyclometallated complex [Pd(o-C6H4CH2NMe2)(THF)2]BF4 gave the expected chelate complex [Pd(o-C6H4CH2NMe2)]BF4. The latter slowly converts in solution to an oligomer in which the ligand behaves as a (eta1-P,eta1-P') bridging ligand, thus leading to a less strained structure. All six ligands, when mixed with [Rh(acac)CO2], effectively catalyse the hydroformylation of octene and styrene. In the hydroformylation of octene, the linear aldehyde selectivities observed with L2 and L3 are significantly higher (linear : branched =ca. 10) than those obtained with the other 4 ligands of this study and also with respect to PPh3. Molecular modelling shows that the lower rim substituents of and form tighter pockets about the metal centre than do the other ligands and so sterically favour the formation of Rh(n-alkyl) intermediates over that of Rh(i-alkyl) ones. In styrene hydroformylation, all ligands result in the formation of unusually high amounts of the linear aldehyde, the b : l ratios being all close to 65 : 35. The highest activities were found when using an L/Rh ratio of 1/1. PMID:15782268

Steyer, Stephane; Jeunesse, Catherine; Harrowfield, Jack; Matt, Dominique

2005-04-01

42

Les réformes des retraites de 1993 et 2003 vont-elles conduire à un allongement des carrières professionnelles ?  

Microsoft Academic Search

Ce papier vise à estimer l'effet des hausses de la durée requise de cotisation des réformes 1993 et 2003 des retraites sur l'allongement de la durée des carrières en France. L'utilisation des données administratives et exhaustives de la CNAV (1994-2003) nous permet de rendre compte empiriquement de l'élasticité de l'âge de liquidation de la retraite à la durée requise de

Antoine Bozio

2006-01-01

43

poids du liquide organique volatilis s'levant 20 ou 30gr dans la plupart des cas. On teint alors le feu, on enlve la fiole, on la  

E-print Network

'est-à-dire que les parties les plus éloignées semblent plus grandes que les parties les plus rap- prochées conclusions seront les mêmes. La longueur focale de l'objectif et celle de l'oculaire étant F etf, soit ( F côtés AP = A et BP, i B au foyer de l'objectif; p' et p étant dans l'instrument les distances des images

Boyer, Edmond

44

Oligomerization of n-butenes catalyzed by nickel complexes dissolved in organochloroaluminate ionic liquids  

SciTech Connect

The industrial synthesis of higher olefins is generally performed via oligomerization of lower olefins by transition metal complexes or acidic catalysts. The broad variety of olefins that are nowadays produced by these reactions are used as polyethylene co-monomers or as intermediates in the synthesis of detergents, surface active compounds, lubricating oils, and plasticizers. Thus, in the Dimersol{reg_sign} process, butenes are dimerized into C{sub 8} olefins which are usually further hydroformylated giving C{sub 9} alcohols used in the manufacture of plasticizers. In spite of important research efforts devoted to these homogeneous phase oligomerization reactions, activity and conversion still need to be improved. In a more general sense, the separation of the products from the catalyst and the solvent is a major drawback, which leads to increased operational costs and environmental impact. Organochloroaluminate ionic liquids have been envisioned as solvents of nickel catalysts in oligomerization reactions to overcome this technical limitation. The solubility of nickel complexes and the poor solubility of olefins in polar and non-coordinating ionic liquids make possible the separation of the reaction products by simple decantation, with low costs and absence of by-products. In the present article, the authors report the use of 1-butyl-3-methylimidazolium chloro-ethyl-aluminate ionic liquids as solvents in butene oligomerization catalyzed by nickel complexes in a two-phase system. 24 refs., 2 figs., 2 tabs.

Chauvin, Y.; Olivier, H. [Institut Francais du Petrole, Rueil-Malmaison (France)] [Institut Francais du Petrole, Rueil-Malmaison (France); Wyrvalski, C.N. [Universidade Federal do Rio, Porto Alegre (Brazil)] [Universidade Federal do Rio, Porto Alegre (Brazil)

1997-01-15

45

Liquid-Liquid Extraction Processes  

E-print Network

Liquid-liquid extraction is the separation of one or more components of a liquid solution by contact with a second immiscible liquid called the solvent. If the components in the original liquid solution distribute themselves differently between...

Fair, J. R.; Humphrey, J. L.

1983-01-01

46

FEMININ, MASCULIN : ANTHROPOLOGIE DES  

E-print Network

#12;#12;FEMININ, MASCULIN : ANTHROPOLOGIE DES CAT�GORIES ET DES PRATIQUES MEDICALES 2007 #12;AUX;FEMININ, MASCULIN. ANTHROPOLOGIE DES CAT�GORIES ET DES PRATIQUES MEDICALES Sous la direction de Virginie, en France, du paradoxe d'une surmortalité masculine et d'une surmor- bidité féminine. Cette apparente

Boyer, Edmond

47

PHARMA -Rglement des examens et des jurys 2013-2014 Rglement des examens -Pharma 2013  

E-print Network

PHARMA - Règlement des examens et des jurys 2013-2014 Règlement des examens - Pharma 2013 1 missions décrites dans ce règlement. #12;PHARMA - Règlement des examens et des jurys 2013-2014 Règlement des examens - Pharma 2013 2 UNIVERSITE LIBRE DE BRUXELLES DEPARTEMENT ENSEIGNEMENT SERVICE D

Cerf, Nicolas

48

Des Programmes de recherche  

E-print Network

'aléa sismique. La cartographie du risque de tsunami obtenue - véritable photographie instantanée de l chercheurs expliquent certains modes de propagation du tsunami le long des côtes thaïlandaises. Ainsi, la'élaboration des plans d'urbanisation des zones côtières et le maintien ou la réimplan- tation des protections

49

Die Entwicklung des Universums  

E-print Network

/= =AbstandzwischenzweientferntenGalaxien Evolution des Universums (Einstein) Alter des Universums ~ 15 Milliarden Jahre Urknall Beobachtungen+ = Hintergrundstrahlung Rotverschiebung Alter ~ Jahre Chemie : 75% H, 25% He 10 1015 #12;T.Hebbeker Evolution des Universums (a la Einstein) == krit m 3 /3 mAtomeH - · Hubble-Konstante (kinetische Energie

Hebbeker, Thomas

50

Bisamino(diphosphonite) with dangling olefin functionalities: synthesis, metal chemistry and catalytic utility of Rh(I) and Pd(II) complexes in hydroformylation and Suzuki-Miyaura reactions.  

PubMed

Bisamino(diphosphonite), p-C6H4{N{P(OC6H4C3H5-o)2}2}2 (1), was prepared by reacting p-C6H4{N(PCl2)2}2 with four equivalents of o-allylphenol in 85% yield. Compound 1 on treatment with [M(CO)4(HNC5H10)2] (M = Mo or W) gave cis-[{M(CO)4}2{p-C6H4{N(P(OC6H4C3H5-o)2)2}2}] (2, M = Mo; 3, M = W). The reaction of 1 with [Fe(?(5)-C5H5)(CO)2]2 yielded the complex [{Fe(?(5)-C5H5)(?-CO)}2{p-C6H4{N(P(OC6H4C3H5-o)2)2}2}] (4). Treatment of 1 with Fe(CO)5 furnished a mononuclear complex, [{Fe(CO)3}2{p-C6H4{N{P(OC6H4C3H5-o)2}2}2}] (5). The ruthenium(II) complex, [{(?(6)-p-cymene)Ru(?-Cl)3RuCl}2{p-C6H4{N(P(OC6H4C3H5-o)2)2}2}] (6), was obtained on treatment of ligand 1 with [(?(6)-p-cymene)Ru(Cl)2]2. The reaction between 1 and [Rh(COD)Cl]2 (COD = 1,5-cyclooctadiene) in dichloromethane resulted in the formation of a dinuclear complex [{RhCl}2{p-C6H4{N(P(OC6H4C3H5-o)2)2}2}] (7), in which the allyl double bond of one of the phenoxy groups coordinates to the metal center. When ligand 1 was reacted with two equivalents of [Pd(COD)Cl2], a dinuclear complex [{PdCl2}2{p-C6H4{N(P(OC6H4C3H5-o)2)2}2}] (8) was obtained. With copper(I) halides, ligand 1 afforded tetranuclear complexes, [{(Cu(?-X)(NCCH3))2}2{p-C6H4{N(P(OC6H4C3H5-o)2)2}2}] (9, X = Cl; 10, X = Br; 11, X = I). Reaction of 1 with four equivalents of [AuCl(SMe2)] produced a tetranuclear complex, [(AuCl)4{p-C6H4{N{P(OC6H4C3H5-o)2}2}2}] (12). Complex 8 shows excellent catalytic activity in the Suzuki-Miyaura cross-coupling reaction under microwave conditions and complex 7 catalyzes hydroformylation of styrenes with good TONs. PMID:24165930

Naik, Susmita; Kumaravel, Maruthai; Mague, Joel T; Balakrishna, Maravanji S

2014-01-21

51

DTERMINATION CALORIMTRIQUE DU COEFFICIENT D'ABSORPTION DU SON DANS LES COMPOSS ORGANIQUES LIQUIDES  

E-print Network

'un liquide est proportionnel à l'intensité des vibrations en ce point. Donc, en mesurant la chaleur dégagée""' liquide suffisante pour que toutes les vibrations ultrasonores qui traversent la fenêtre soient absorbées LIQUIDES Par S. PARTHASARATHY, S. S. CHARI et P. P. MAHENDROO, National Physical Laboratory of India, New

Boyer, Edmond

52

Do liquidity measures measure liquidity?  

Microsoft Academic Search

Given the key role of liquidity in finance research, identifying high quality proxies based on daily (as opposed to intraday) data would permit liquidity to be studied over relatively long timeframes and across many countries. Using new measures and widely employed measures in the literature, we run horseraces of annual and monthly estimates of each measure against liquidity benchmarks. Our

Ruslan Y. Goyenko; Craig W. Holden; Charles A. Trzcinka

2009-01-01

53

Sealing liquids with magnetic liquids  

Microsoft Academic Search

The stability and durability of magnetic liquid seals have been tested under the condition of sealing other liquids. The results show that the deterioration of the magnetic fluid depends on the nature and combination of magnetic and nonmagnetic liquids as well as on the shaft speed, the temperature of the seal and the gradient of the magnetic field. Seal life

J. Kurfess; H. K. Müller

1990-01-01

54

Dépistage et typage des infections à HPV par technique INNO-LiPA sur milieu liquide Easyfix Labonord après extraction QIAamp DNA Blood Mini Kit ® Qiagen et Nuclisens easyMAG ® Biomérieux  

Microsoft Academic Search

ObjectivesThe objective of this study is to validate the use of test INNO-LIPA HPV Genotyping Extra (Innogenetics) on liquid cytology media EasyFix Labonord by comparing the extraction kit QIAamp DNA Blood Mini Kit® (Qiagen) and an automated method, Nuclisens easyMAG® (Biomérieux).

S. Hantz; M. Goudard; V. Marczuk; J. Renaudie; C. Dussartre; D. Bakeland; F. Denis; S. Alain

2010-01-01

55

PREFACE: Functionalized Liquid Liquid Interfaces  

NASA Astrophysics Data System (ADS)

Most natural processes take place at interfaces. For this reason, surface science has been a focal point of modern research. At solid-liquid interfaces one can induce various species to adsorb or react, and thus may study interactions between the substrate and adsorbates, kinetic processes, optical properties, etc. Liquid-liquid interfaces, formed by immiscible liquids such as water and oil, have a number of distinctive features. Both sides of the interface are amenable to detailed physical and chemical analysis. By chemical or electrochemical means, metal or semiconductor nanoparticles can be formed or localised at the interface. Surfactants can be used to tailor surface properties, and also to place organic molecular or supermolecular constructions at the boundary between the liquids. Electric fields can be used to drive ions from one fluid to another, or even change the shape of the interface itself. In many cases, both liquids are optically transparent, making functionalized liquid-liquid interfaces promising for various optical applications based on the transmission or reflection of light. An advantage common to most of these systems is self-assembly; because a liquid-liquid interface is not mechanically constrained like a solid-liquid interface, it can easily access its most stable state, even after it has been driven far from equilibrium. This special issue focuses on four modes of liquid-liquid interfacial functionalization: the controlled adsorption of molecules or nanoparticles, the formation of adlayers or films, electrowetting, and ion transfer or interface-localized reactions. Interfacial adsorption can be driven electrically, chemically, or mechanically. The liquid-liquid interface can be used to study how anisotropic particles orient at a surface under the influence of a field, how surfactants interact with other adsorbates, and how nanoparticles aggregate; the transparency of the interface also makes the chirality of organic adsorbates amenable to optical study. Film formation goes a step beyond adsorption; some surfactants form monolayers or multilayers at the interface. A polymer microfilm or a polymer-particle matrix can be synthesized at the liquid-liquid boundary. Such films exhibit unique adsorption and ion-intercalation properties of their own. Electrowetting refers broadly to the phenomenon in which an applied voltage modulates the shape of a liquid-liquid interface, essentially by altering the surface tension. Electric fields can be used to induce droplets on solid substrates to change shape, or to affect the structure of liquid-liquid emulsions. Various chemical reactions can be performed at the liquid-liquid boundary. Liquid-liquid microelectrodes allow detailed study of ion-transfer kinetics at the interface. Photochemical processes can also be used to control the conformations of molecules adsorbed at the interface. But how much precise control do we actually have on the state of the interfacial region? Several contributions to this issue address a system which has been studied for decades in electrochemistry, but remains essentially unfamilar to physicists. This is the interface between two immiscible electrolytic solutions (ITIES), a progressing interdisciplinary field in which condensed-matter physics and physical chemistry meet molecular electrochemistry. Why is it so exciting? The reason is simple. The ITIES is chargeable: when positioned between two electrodes it can be polarized, and back- to-back electrical double layers form on both sides of the liquid-liquid interface. Importantly, the term immiscible refers not only to oil and water but also to the electrolytes. Inorganic electrolytes, such as alkali halides, tend to stay in water, whereas organic electrolytes, such as tetrabutylammonium tetraphenylborate, stay in oil. This behaviour arises because energies of the order of 0.2-0.3 eV are needed to drive ions across the interface. As long as these free energies of transfer are not exceeded by the external potential bias, the ITIES works as an 'electrode'; there is no traffic of ions

Girault, Hubert; Kornyshev, Alexei A.; Monroe, Charles W.; Urbakh, Michael

2007-09-01

56

PROGRAMMES DES LYCES MATHMATIQUES  

E-print Network

8 Le B.O. N°7 1ER SEPT. 2005 PROGRAMMES DES LYC�ES MATH�MATIQUES CLASSE TERMINALE - S�RIE LITT�RAIRE HORS-S�RIE Annexe #12;9Le B.O. N°7 1ER SEPT. 2005 PROGRAMMES DES LYC�ES MATH�MATIQUES CLASSE TERMINALE - S�RIE LITT�RAIRE HORS-S�RIE #12;10 Le B.O. N°7 1ER SEPT. 2005 PROGRAMMES DES LYC�ES

Menichi, Luc

57

Galaxy clusters in DES  

NASA Astrophysics Data System (ADS)

Galaxy clusters are one of the four key cosmic acceleration probes used by the Dark Energy Survey (DES) to measure cosmological parameters with unprecedented precision. DES has recently completed commissioning of its instrument and accomplished a successful science verification data taking phase. The survey proper started in Aug 31, 2013. In this talk, I review the motivation for using clusters of galaxies in cosmology, discuss the DES expected performance and present the prospects to improve our understanding of dark energy by constraining cosmological models using galaxy clusters found by the Voronoi Tesselation galaxy cluster finding algorithm. We show results of our galaxy cluster analysis based on the early DES data sets.

Soares-Santos, Marcelle; DES Collaboration

2014-01-01

58

Market Liquidity and Funding Liquidity  

Microsoft Academic Search

We provide a model that links an asset's market liquidity (i.e., the ease with which it is traded) and traders' funding liquidity (i.e., the ease with which they can obtain funding). Traders provide market liquidity, and their ability to do so depends on their availability of funding. Conversely, traders' funding, i.e., their capital and margin requirements, depends on the assets'

Markus K. Brunnermeier; Lasse Heje Pedersen

2009-01-01

59

LA GESTION DES RESULTATS COMPTABLES LORS DES FUSIONS  

E-print Network

in the year preceding the takeover. Key Words: Earnings management; Mergers and Acquisitions; InternationalLA GESTION DES RESULTATS COMPTABLES LORS DES FUSIONS ET ACQUISITIONS: UNE ANALYSE DANS LE CONTEXTE des résultats comptables lors des fusions et acquisitions: Une analyse dans le contexte Suisse Résumé

Paris-Sud XI, Université de

60

MIGRATION DES JOINTS DE GRAINS LA MIGRATION DES JOINTS INTERGRANULAIRES  

E-print Network

MIGRATION DES JOINTS DE GRAINS LA MIGRATION DES JOINTS INTERGRANULAIRES O. DIMITROV Centre d nombre de faits fondamentaux concernant la migration des joints de grains sont brièvement rappelés considérant les forces qui provoquent ou qui freinent la migration. L'évolution des modèles proposés pour

Boyer, Edmond

61

Elimination des noeuds dans le probleme newtonien des quatre corps  

Microsoft Academic Search

Résumé Nous appliquons la méthode des transformations canoniques à variables imposées à la réduction du problème newtonien des quatre corps. L'élimination du centre de gravité étant supposée faite, le problème est ramené à celui des trois corps fictifs. Alors nous menons à bien la réduction dûe aux intégrales des aires explicitement sous forme Hamiltonienne en tenant compte de l'aspect géométrique

Françoise Boigey; M. Curie

1982-01-01

62

Facult des arts et des sciences Dpartement de communication  

E-print Network

Faculté des arts et des sciences Département de communication Plans de cours cadre Cours des programmes de premier cycle en sciences de la communication Comité des études de premier cycle Adopté par l..................................................................................................................................3 COM 1150 Rédaction en communication 1

Parrott, Lael

63

Vincent Manet Mthode des  

E-print Network

Vincent Manet Méthode des éléments finis Vulgarisation des aspects mathématiques et illustration de la méthode Version 3 du 20 août 2013 cel-00763690,version3-22Aug2013 #12;Vincent Manet -- 2013 (Ceci

64

Low-frequency conductivity of a nondegenerate two-dimensional electron liquid in strong magnetic fields  

E-print Network

for a nondegenerate 2DES ( F kBT) W 130.4 For W 1, a 2DES is still strongly correlated, but it forms an electronLow-frequency conductivity of a nondegenerate two-dimensional electron liquid in strong magnetic the energy of a photon goes to the interaction energy of the many-electron system, whereas the involved

Dykman, Mark

65

Video-microscopic observation of ionic liquid/alcohol interface and the corresponding molecular simulation study  

NASA Astrophysics Data System (ADS)

This research is aimed at studying the ionic liquid/n-pentanol interface via video-microscopy and molecular dynamic simulations. Understanding the interfacial phenomena and interfacial transport between ionic liquids and other liquids is of interest to the development and application of ionic liquids in a number of areas. One such area is the biphasic hydroformylation of alkenes to obtain alcohol and aldehyde, in which case ionic liquid is the reaction medium where a catalyst resides. The dissolution of an ionic liquid into an alcohol was studied by microscopically observing and measuring the shrinking of a micropipette-produced droplet in real time. Although microscopic investigation of droplet dissolution has been studied before, no attempt had been made to measure the diffusion coefficient D of the droplet species in the surrounding medium. A key finding of this work is that the Epstein-Plesset mathematical model, which describes the dissolution of a droplet/bubble in another fluid medium, can be used to measure D. Other experimental studies of the ionic liquid/alcohol system include electrical conductivity and UV-visible spectroscopy measurements of solutions of 1-hexyl-3-methylimidazolium tetrafluoroborate in n-pentanol. Those experiments were done in order to understand the molecular state of the particular ionic liquid in n-pentanol, as well as obtaining the dissociation constant K of such weak electrolyte solution. The experimental results provide an entry to the assessment of ionic liquid interaction with n-pentanol at molecular scale. Subsequently, molecular dynamics simulation was implemented for the investigation of such interaction. The computation started with simulation of the bulk phase of 1-butyl-3-methylimidazolium tetrafluoroborate, an affine ionic liquid on which molecular simulations had already been reported. A generalized probability based on Fuoss approximation for the closest ion to a distinguished countercharge ion was developed. In addition to 1-butyl-3-methylimidazolium tetrafluoroborate, the generalization was tested also on tetraethyl ammonium tetrafluoroborate in propylene carbonate from low to high concentrations, and on the corresponding primitive model. Such generalization helps us understand paring of ions in electrolyte solution, especially for elevated concentrations. Two cases of 1-hexyl-3-methylimidazolium tetrafluoroborate ionic liquid/n-pentanol system were studied, which are (i) liquid-liquid interface; and (ii) solution of the former in the latter. Computation of biphasic interface revealed interaction at the liquid-liquid junction, e.g., the transport of molecules from one phase to another, and lead to evaluation of diffusion coefficient that has good agreement with experimental measurement. The simulation of dilute electrolyte solution, i.e., an ionic liquid pair in n-pentanol, gives free energy change as a function of ion separation distance. The dissociation constant K was evaluated and found to be closed to experimental value that was obtained from solution conductivity measurement. The investigation of ion dynamics, especially the memory function transformed from velocity autocorrelation function, lead to the finding of dielectric friction in the system. Furthermore, precise evaluation of D gives satisfied agreement with experimental measurement from micropipette technique.

Zhu, Peixi

66

Liquid penetrants  

NASA Technical Reports Server (NTRS)

Liquid-penetrant inspection is discussed for surface defects in solids. The principle advantages are considered to be its simplicity and economy. The techniques and penetrants are described along with the developers. Commercially available equipment is also described.

Pasley, R. L.

1973-01-01

67

Exploring Liquids  

NSDL National Science Digital Library

Young learners investigate and observe the properties of three liquids -- water, vegetable oil, and corn syrup. They use their senses to collect data and ask and answer questions. This lesson for young learners introduces the scientific process.

Janulaw, Sharon

2010-01-01

68

Dmographie Facult des arts et des sciences  

E-print Network

� sera maintenue). Professeur: LACHAUD, James Courriel: james.lachaud@umontreal.ca Local: C-5031'analyse explicative: les causes et cons�quences des ph�nom�nes. Le cours ciblera les r�gressions lin�aires et non-lin

Parrott, Lael

69

PHARMA -Rglement des examens et des jurys 2013-2014 Rglement des examens -Pharma juin 2013 1 / 16  

E-print Network

PHARMA - Règlement des examens et des jurys 2013-2014 Règlement des examens - Pharma juin 2013 1 missions décrites dans ce règlement. #12;PHARMA - Règlement des examens et des jurys 2013-2014 Règlement des examens - Pharma juin 2013 2 / 16 2 UNIVERSITE LIBRE DE BRUXELLES DEPARTEMENT ENSEIGNEMENT SERVICE

Cerf, Nicolas

70

PROCDURE DE DCLARATION DES ACCIDENTS, DES INCIDENTS ET DES SITUATIONS DANGEREUSES EN MILIEU DE TRAVAIL Novembre 2013  

E-print Network

PROC�DURE DE D�CLARATION DES ACCIDENTS, DES INCIDENTS ET DES SITUATIONS DANGEREUSES EN MILIEU DE de déclaration des accidents, des incidents et des situations dangereuses en milieu de travail. Ce, tout accident ou incident doit faire l'objet d'une déclaration officielle auprès de l'employeur. Selon

Meunier, Michel

71

Liquid Crystals  

NASA Technical Reports Server (NTRS)

Thermochromic liquid crystals, or TLCs, are a type of liquid crystals that react to changes in temperature by changing color. The Hallcrest/NASA collaboration involved development of a new way to visualize boundary layer transition in flight and in wind tunnel testing of aircraft wing and body surfaces. TLCs offered a new and potentially better method of visualizing the boundary layer transition in flight. Hallcrest provided a liquid crystal formulation technique that afforded great control over the sensitivity of the liquid crystals to varying conditions. Method is of great use to industry, government and universities for aerodynamic and hydrodynamic testing. Company's principal line is temperature indicating devices for industrial use, such as non-destructive testing and flaw detection in electric/electronic systems, medical application, such as diagnostic systems, for retail sale, such as room, refrigerator, baby bath and aquarium thermometers, and for advertising and promotion specials. Additionally, Hallcrest manufactures TLC mixtures for cosmetic applications, and liquid crystal battery tester for Duracell batteries.

1990-01-01

72

Plan de cours Facult des arts et des sciences  

E-print Network

Powerpoint sont en anglais tandis que je parle surtout en fran�ais et la plupart des discussions en classe se �tudiants devront pr�parer des diapositives en utilisant le logiciel PowerPoint. Les �tudiants doivent donc l'enseignement du fonctionnement des logiciels tels que PowerPoint, QuarkXPress, InDesign ou autre

Parrott, Lael

73

SURVEILLANCE ET CONTROLE DES ACTIVITES DES NAVIRES EN MER  

E-print Network

, clandestine immigrants, piracy, toxic waste pollution, accidents, etc.). Key words: Maritime border security1 SURVEILLANCE ET CONTROLE DES ACTIVITES DES NAVIRES EN MER ScanMaris Michel MOREL (DCNS), Aldo produits illicites, l'immigration clandestine, la sur exploitation des ressources halieutiques, les

Boyer, Edmond

74

La modelisation mathematique des plasmas au service des technologies spatiales  

E-print Network

1 La mod�elisation math�ematique des plasmas au service des technologies spatiales C. Besse (1) P'activit�e solaire sur l'environnement terrestre . . . . . . . . . . 13 2.3 Qu'est ce qu'un plasma.3.2 Plasmas froids et plasmas chauds . . . . . . . . . . . . . . . . . . . . . . 14 2.3.3 Autres aspects des

Vignal, Marie-Hélène

75

Qualit des composts et des digestats Fabienne MULLER  

E-print Network

Qualité des composts et des digestats Fabienne MULLER Direction consommation durable et déchets organiques se construit, avec aujourd'hui le développement important de la méthanisation. Les composts actuellement produits, peuvent l'être avec des digestats ou non. Les quantités de compost produit ne cessent d

Boyer, Edmond

76

The DES Story: Lessons Learned  

Cancer.gov

Dr. Robert Hoover discusses the DES followup study, which follows diethylstilbestrol (DES) exposed and unexposed mothers, daughters and sons, and granddaughters for adverse health effects resulting from this exposure.

77

Liquid Hydrogen  

Microsoft Academic Search

THE letter of W. Hampson, which appears in your issue of May 26, can only mean by implication to charge me with having utilised without acknowledgment an idea of his, conveyed through a third party, in my paper on the liquid hydrogen jet, published in 1895. Such a suggestion is absolutely without any foundation in fact. My results would have

J. Dewar

1898-01-01

78

Des conflits toutes les chelles  

E-print Network

Des conflits à toutes les échelles Des conflits à toutes les échelles La ressource en eau se raréfie et la demande s'accroît. Cette situation peut être source de tensions ou raviver des conflits déjà ayant droits d'amont et ceux d'aval, - différends entre deux rives d'un même canal, - conflits entre des

79

Die pharmakologische Wirkung des Ephedrins  

Microsoft Academic Search

Zusammenfassung 1.Die pharmakologische Wirkung des Ephedrins wurde zu analysieren versucht durch Studium der Beeinflussung des Blutdrucks, der Herzaktion und der Gefäße, des Effekts am Atemzentrum und an den Bronchien, der Wirkung auf die Pupillenweite, auf den Darm und den Uterus, auf die Sekretion verschiedener Drüsen und den Blutzuckerspiegel.2.Es wurden folgende Wirkungen gefunden: Der Blutdruck wird erhöht durch kleine Dosen, erniedrigt

H. Kreitmair

1927-01-01

80

SYNTHSE DES RUNS AVEC RAPPEL  

E-print Network

SYNTH�SE DES RUNS ORCA05 AVEC RAPPEL Octobre 2009 Patrice Bellec et Thierry Huck Laboratoire de Physique des Océans (UMR 6523 CNRS IFREMER IRD UBO) #12;Sommaire DESCRIPTION DES RUNS ORCA05 ........................................................................................3 ORCA05-BPB14 : run libre de 1958 à 2008

Huck, Thierry

81

NOTE TECHNIQUE RECHERCHE DES SALMONELLA  

E-print Network

NOTE TECHNIQUE RECHERCHE DES SALMONELLA PAR IMMUNOFLUORESCENCE M. CATSARAS J. ANANI Laboratoire Salmonella, 366 prélèvements, dans 125 boucheries, pour lesquels nous avons comparé les techniques d, dus à des coliformes. Ses avantages et ses inconvénients pour la recherche des Salmonella sont

Paris-Sud XI, Université de

82

INFLUENCE DES AGENTS CHIMIQUES SUR LES PROPRITS SUPERFICIELLES DU MERCURE;  

E-print Network

2I3 INFLUENCE DES AGENTS CHIMIQUES SUR LES PROPRI�T�S SUPERFICIELLES DU MERCURE; PAR M. G. LIPPMANN différence électrique d'une surface de mercure mouillée, soit au moyen d'un courant élec- trique, soit en. La forme de cette fonction a été déterminée dans le cas où le liquide qui mouille le mercure est de l

Paris-Sud XI, Université de

83

Une charte pour scuriser la pratique des stages charte des stages des tudiants en entreprise  

E-print Network

Une charte pour sécuriser la pratique des stages charte des stages des étudiants en entreprise Le 26 avril 2006, une charte, dont l'objectif est de sécuriser la pratique des stages, a été conclue parcours pédagogique. Un stage ne peut être considéré comme un emploi. Cette charte, rédigée par les

Di Girolami, Cristina

84

Historic Des Moines  

NSDL National Science Digital Library

The early 20th century was a bustling time for many cities in the Midwest, and Des Moines was no exception. During this time, the city added streetcars, built many new public schools, and welcomed thousands of new residents. This digital collection from Drake University's Cowles Library offers hundreds of images of the city from 1904 through 1914. First-time visitors should read the introductory essay by John Zeller titled "From the Real to the Ideal; Images of Des Moines in the Progressive Era." After reading this piece, visitors will have a sense of the historical context of the images in the archive and Des Moines's history during this period. Visitors can browse at their leisure, and they can also use the interactive map to wander virtually around the city. Visitors should use the map to look at some of the wonderful homes around Union Park, including the L. Aulmann residence at 1712 Pennsylvania Avenue.

2012-02-24

85

Liquid electrode  

DOEpatents

A dropping electrolyte electrode for use in electrochemical analysis of non-polar sample solutions, such as benzene or cyclohexane. The liquid electrode, preferably an aqueous salt solution immiscible in the sample solution, is introduced into the solution in dropwise fashion from a capillary. The electrolyte is introduced at a known rate, thus, the droplets each have the same volume and surface area. The electrode is used in making standard electrochemical measurements in order to determine properties of non-polar sample solutions.

Ekechukwu, Amy A. (Augusta, GA)

1994-01-01

86

The electromechanics of liquids electrowetting (EWOD) & liquid  

E-print Network

as the energy storage mechanism. Why does virtual work method work? dielectric liquid z We´ C #12;11 Pellat-emulsion droplets #12;4 The original experiment of Pellat 1895 Paris h + V - gravity dielectric liquid: , air: =1 ! h " (#liquid $1)%o Eo 2 2&liquid g #12;5 Quincke bubble method (1883) air bubble trapped between 2

Jones, Thomas B.

87

Des Vents et des Jets Astrophysiques  

NASA Astrophysics Data System (ADS)

Plasma outflows from a central gravitating object are a widespread phenomenon in astrophysics. They include the solar and stellar winds, jets from Young Stellar Objects, jets from compact stellar objects and extra-galactic jets associated with Active Galactic Nuclei and quasars. Beyond this huge zoology, a common theoretical ground exists. The aim of this review is to present qualitatively the various theories of winds (Part 1) and how different astrophysical domains interplay. A more or less complete catalog of the ideas proposed for explaining the acceleration and the morphologies of winds and jets is intended. All this part avoids getting into any mathematical formalism. Some macroscopic properties of such outflows may be described by solving the time-independent and axisymmetric magnetohydrodynamic equations. This formalism, underlying most of the theories, is presented in Part 2. It helps to introduce quantitatively the free integrals that such systems possess. Those integrals play an important role in the basic physics of acceleration and collimation, in particular the mass loss rate, the angular momentum loss rate and the energy of the magnetic rotator. Most of the difficulty in modelling flows lies in the necessity to cross critical points, characteristic of non linear equations. The physical nature and the location of such critical points is debated because they are the clue towards the resolution. We thus introduce the notions of topology and critical points (Parts 3 and 4) from the simplest hydrodynamic and spherically symmetric case to the most sophisticated, MHD and axisymmetric cases. Particular attention is given to self-similar models which allows to give some general and simple ideas on the problem due to their semi-analytical treatment. With the use of these notions, a more quantitative comparison of the various models is given (Parts 3 and 4), especially on the shape of the flows. It is thus shown that magnetic collimation of winds into jets is a well expected result from the theory. Although, collimation may be conical, paraboloidal or cylindrical (Part 4), cylindrical collimation is the more likely to occur. The shape of outflows may then be used as a tool to predict physical conditions on the flows or on their source. L'éjection continue de plasma autour d'objets massifs est un phénomène largement répandu en astrophysique, que ce soit sous la forme du vent solaire, de vents stellaires, de jets d'étoiles en formation, de jets stellaires autour d'objets compacts ou de jets extra-galactiques. Cette zoologie diversifiée fait pourtant l'objet d'un commun effort de modélisation. Le but de cette revue est d'abord de présenter qualitativement le développement, depuis leur origine, des diverses théories de vents (Partie 1) et l'inter disciplinarité dans ce domaine. Il s'agit d'une énumération, plus ou moins exhaustive, des idées proposées pour expliquer l'accélération et la morphologie des vents et des jets, accompagnée d'une présentation sommaire des aspects observationnels. Cette partie s'abstient de tout aspect faisant appel au formalisme mathématique. Ces écoulements peuvent être décrits, au moins partiellement, en résolvant les équations magnétohydrodynamiques, axisymétriques et stationnaires. Ce formalisme, à la base de la plupart des théories, est exposé dans la Partie 2. Il permet d'introduire quantitativement les intégrales premières qu'un tel système possède. Ces dernières sont amenées à jouer un rôle important dans la compréhension des phénomènes d'accélération ou de collimation, en particulier le taux de perte de masse, le taux de perte de moment angulaire ou l'énergie du rotateur magnétique. La difficulté de modélisation réside dans l'existence de points critiques, propres aux équations non linéaires, qu'il faut franchir. La nature physique et la localisation de ces points critiques fait l'objet d'un débat important car ils sont la clef de voute de la résolution. Nous introduisons donc la notion de topologie des points critiques (Parties 3 et 4

Sauty, C.

88

Conservation des Textiles  

E-print Network

Conservation des Textiles Les 22 et 23 mai 2013 Soit 2 jours - 14 heures OBJECTIFS DE LA FORMATION essentielles dans la gestion de collections textiles, depuis leur identification jusqu'à leur conservation conservation d'éléments et de collections textiles, et toutes personnes travaillant dans le domaine du

Brest, Université de

89

Therapiestrategien des fortgeschrittenen Nierenkarzinoms  

Microsoft Academic Search

Die Therapie des metastasierten Nierenkarzinoms hat in den letzten Jahren eine grundlegende Wandlung erfahren. Galt diese Entität früher als infaust und inoperabel, so gilt mittlerweile als gesichert, dass die Tumornephrektomie auch bei metastasierten Primärtumoren als urologisch-onkologischer Standard gilt, sofern im individuellen Fall vertretbar und technisch machbar. Auch die operative Entfernung von Metastasen, sofern eine komplette Resektion möglich ist, gilt als

M. Staehler; N. Haseke; G. Schöppler; T. Stadler; C. Adam; C. G. Stief

2006-01-01

90

DTERMINATION DU COEFFICIENT D'AUTODIFFUSION DU MERCURE PAR LA MTHODE DES CHANGES ISOTOPIQUES  

E-print Network

611 D�TERMINATION DU COEFFICIENT D'AUTODIFFUSION DU MERCURE PAR LA M�THODE DES �CHANGES ISOTOPIQUES'autodiffusion du mercure liquide � 20� C est voisin de 7.10-8 cm2 : s. L'�nergie d'activitation du processus est 3�tallique, mercure liquide. Nous avons repris ces exp�riences sur le syst�me Hg/Hg, (NO3)2 afin de d�terminer le

Boyer, Edmond

91

Liquid Rainbow  

NSDL National Science Digital Library

In this density activity, students determine the relative densities of five liquids and layer them atop one another in a straw. Directions for conducting the activity are included in addition to lists of the science process skills, complex reasoning strategies, and National Science Education Standards that relate to it. A brief explanation of the activity's science content and an assessment idea are also provided. This activity is part of a set called Whelmers that were designed to inspire students to think about science concepts.

Mid-continent Research for Education and Learning (McREL); Jacobs, Steve

2004-01-01

92

Apprendre dialoguer avec des lves : le cas des dialogues philosophiques  

E-print Network

.*, & Daniel, M.-F. (2009). Apprendre à dialoguer > avec des élèves : le cas des dialogues philosophiques Daniel Laboratoire P.A.E.D.I. Iufm d'Auvergne, JE2432 & Laboratoire de psychologie cognitive et clinique maître qu'aux élèves ? Du côté du maître, existe-t-il des gestes professionnels susceptibles d'amener

Paris-Sud XI, Université de

93

Expos de synthse Etude immunochimique des molcules du CMH des  

E-print Network

Exposé de synthèse Etude immunochimique des molécules du CMH des bovins (BoLA) D. Levy, J'histocompatibilité - réunion scientifique - structure - fonction Bovine CMH (BoLA) molecules : immunochemical study major'histocom- patibilité (CMH) des bovins (BOLA) pré- sente un triple intérêt : - sur le plan économique, les bovins

Boyer, Edmond

94

charnues, des sauges, et des cosmos peine sor-  

E-print Network

°39 L'hebdo de l'�cole normale supérieure NOUVELLES DES SERVICES ELLES se nomment Lili Marlen, Queen'esprit de l'as- sidu du snack vers des nourritures moins terrestres, distraire le candidat au concours de des savoirs [cf. normale sup' info n°4] qui a pour vocation de mettre à la disposition de tous les

Gutkin, Boris

95

UNIVERSIT DE MONTRAL Facult des arts et des sciences  

E-print Network

UNIVERSIT� DE MONTR�AL Faculté des arts et des sciences Département d'informatique et de recherche'étudiant :_____________________________________________________________ (en caractère d'imprimerie) Code permanent : ________________________________________ Programme : M.Sc. Maîtrise (2-175-1-0) Informatique Ph.D. Doctorat (3-175-1-0) Informatique Trimestre/Année du début des

Montréal, Université de

96

Die Kommerzialisierung des Kinderfernsehens unter besonderer Berücksichtigung des Merchandising.  

E-print Network

??Die vorliegende Arbeit thematisiert die Kommerzialisierungsentwicklungen im Kinderfernsehprogramm im deutschsprachigen Raum unter besonderer Berücksichtigung der Praxis des Merchandising. Die Beobachtung, dass uns Figuren aus dem… (more)

Nigl, Andrea

2009-01-01

97

Les protéines des corps d'inclusion des Baculovirus  

Microsoft Academic Search

Résumé  La comparaison des granules ou des protéines de granules desBaculovirus dePieris brassicae, Pygaera anastomosis, Hyphantria cunea, Carpocapsa pomonella, Mythimna unipuncta, Mamestra oleracea a été entreprise par les techniques d'électrophorèse, d'agglutination, d'immunofluorescence et de précipitation en gel. L'électrophorèse\\u000a fait apparaître l'étroite ressemblance qui existe entre les protéines des six sortes de corps d'inclusion. L'analyse immunochimique\\u000a montre que chaque granule est bien

G. Croizier; G. Meynadier

1973-01-01

98

Die Theorie des Radikalen Konstruktivismus im Kommunikationsmodell des NLP.  

E-print Network

??Der Radikale Konstruktivismus setzt sich mit dem Verhältnis von Wissen und Wirklichkeit auseinander. In der Theorie des Radikalen Konstruktivismus ist die Wirklichkeit keine objektive Voraussetzung,… (more)

Brezna, Christa

2009-01-01

99

Guidance Document Cryogenic Liquids  

E-print Network

Guidance Document Cryogenic Liquids [This is a brief and general summary. Read the full MSDS for more details before handling.] Introduction: All cryogenic liquids are gases at normal temperature liquefies them. Cryogenic liquids are kept in the liquid state at very low temperatures. Cryogenic liquids

100

Ionic liquids as electrolytes  

Microsoft Academic Search

Salts having a low melting point are liquid at room temperature, or even below, and form a new class of liquids usually called room temperature ionic liquids (RTIL). Information about RTILs can be found in the literature with such key words as: room temperature molten salt, low-temperature molten salt, ambient-temperature molten salt, liquid organic salt or simply ionic liquid. Their

Maciej Gali?ski; Andrzej Lewandowski; Izabela St?pniak

2006-01-01

101

Weak anchoring energy and pretilt of a nematic liquid crystal (+) G. Barbero (*), N. V. Madhusudana (**) and G. Durand  

E-print Network

'extrapolation L caractérisant l'énergie de surface. Pour des lames traitées au silane et frottées, les valeurs liquid crystal oriented on a suitably treated glass surface. The liquid crystal is placed in a wedge. The transition thickness 010F is comparable with the extra- polation length L associated with the surface energy

Paris-Sud XI, Université de

102

Programmation des activits pdagogiques  

E-print Network

Programmation des activités pédagogiques B.Sc. Biochimie de la santé Version 9 S'adresse aux 411 *Enzymologie de la cellule humaine (BCM 318).....................2 BCM 420 *Bio-informatique (BCL dans le programme. 22 mai 2014 Activités pédagogiques à option (16 crédits) Automne CHM 400 Biochimie

Spino, Claude

103

Liquid-liquid-solid transition in viscoelastic liquids  

PubMed Central

Liquid-liquid-solid transitions (LLST) are known to occur in confined liquids, exist in supercooled liquids and emerge in liquids driven from equilibrium. Molecular dynamics (MD) simulations claim many successes in forecasting the phenomena. The transitions are also studied in the framework of thermodynamics based methods and minimalistic models. In here, the proposed approach is derived in the framework of continuum and includes spatial and temporal dynamic heterogeneities; the approach is meant to capture the material behavior at small scales. We conjecture that the liquid-like and solid-like behaviors are dissimilar enough for the two to be governed by different constitutive relations. In this way, we gain additional degree of freedom, which is found essential when predicting the transitional phenomena. As a result, we derive the LLST criteria for liquids in equilibrium, during steady flow and at transient conditions. Lastly, we forecast short-lived LLSTs in human blood during cardiac cycle. PMID:23429528

Zubelewicz, Aleksander

2013-01-01

104

Liquid foams of graphene  

E-print Network

Liquid foams are dispersions of bubbles in a liquid. Bubbles are stabilized by foaming agents that position at the interface between the gas and the liquid. Most foaming agents, such as the commonly used sodium dodecylsulfate, ...

Alcazar Jorba, Daniel

2012-01-01

105

Lacerations - liquid bandage  

MedlinePLUS

... medical attention. If the cut is minor, a liquid bandage (liquid adhesive) can be used on the cut to ... the wound and help stop bleeding. Using a liquid bandage is quick and painless to apply. Skin ...

106

Liquid Crystal Institute  

NSDL National Science Digital Library

The Liquid Crystal Institute website provides information on the interdisciplinary research and development of liquid crystal optoelectronic materials, technology, and consumer products. It provides basic information on what liquid crystals are as well as how they are made and used.

Institute, Liquid C.

2003-10-10

107

ORGANISATION DES ETUDES La licence professionnelle Gestion des  

E-print Network

: · coordinateur(trice) du Personnel. · assistant(e) Ressources Humaines. · assistant(e) gestion du personnel. · gestionnaire de paie / collaborateur (trice) de paie. I U T La licence professionnelle forme des coordinateurs/trices, projets RH, ...). Licence Professionnelle Gestion des ressources humaines Spécialité Coordinateur/trice du

Pellier, Damien

108

Liquid annulus  

NASA Technical Reports Server (NTRS)

It is shown that the specific impulse varies with the square root of the temperature and inversely with the square root of the molecular weight of the propellant. Typical values for specific impulse corresponding to various rocket concepts are shown. The Liquid Annulus core concept consists of a fuel element which will be arranged in a moderator block. The advantages as seen for the system are: high specific impulse; structural material will all run at low temperature; and lower fission product inventory because of evaporation. It is felt that this concept is worth at least a first look because of the promise of very high specific impulse. Because of the low thrust, one would probably need a cluster of engines. This is not necessarily bad because there would be some redundancy, but because of the low thrust one might have to refuel while running. Depending on the fuel vaporization, material can be included in the uranium that is injected as one is running along.

Ludewig, Hans

1991-01-01

109

LABORATOIRE DE PHYSIQUE DES SOLIDES  

E-print Network

LABORATOIRE DE PHYSIQUE DES SOLIDES UMR 8502 Centre Universitaire, Bât. 510 91405 Orsay cedex) 212503. #12;LABORATOIRE DE PHYSIQUE DES SOLIDES UMR 8502 Centre Universitaire, Bât. 510 91405 Orsay cedex fundamental fine particle magnetism utilizing colloidal dispersions or ferrofluids as the medium for study

Paris-Sud 11, Université de

110

Mensch, Kepler! von Studierenden des  

E-print Network

Mensch, Kepler! von Studierenden des Europaeum und des Lehrstuhls für Vergleichende.europaeum.de vom 10.05. bis 05.10. im Kepler Gedächtnishaus Regensburg Alt bekannt neu entdeckt Mensch, Kepler,wieso bist du überallbekannt? Mensch, Kepler, hattest du eigentlich Kinder? Mensch, Kepler, wie hast du das

Schubart, Christoph

111

Über die Rotationswärme des Wasserstoffs  

Microsoft Academic Search

Zusammenfassung Die neuere Entwicklung der Bandentheorie macht bei zweiatomigen Molekülen ein Elektronenimpulsmoment 1\\/2 senkrecht zur Kernverbindungslinie wahrscheinlich. Der Einfluß hiervon auf die Theorie der Rotationswärme besteht hauptsächlich darin, das berechnete Trägheitsmoment des Moleküls auf 2\\/3 des früheren Wertes herabzudrücken, das ist auf 1,4. 10-41 beim Wasserstoff, was zu anderweitigen Schätzungen (Konstante der Dampfdruckformel, Viellinienspektrum) besser stimmt.

Erwin Schrödinger

1924-01-01

112

RACTIONS DES POPULATIONS ANIMALES ET MICROBIENNES DU SOL A LA PRIVATION DES APPORTS ANNUELS DE LITIRE  

E-print Network

1 R�ACTIONS DES POPULATIONS ANIMALES ET MICROBIENNES DU SOL A LA PRIVATION DES APPORTS ANNUELS DE entraînera des désordres au sein des populations animales et microbiennes et donc retentira sur la structure des friches nitrophiles. Secondairement ce phénomène va retentir sur les populations animales et

Paris-Sud XI, Université de

113

Novelties of liquid–liquid–liquid phase transfer catalysis  

Microsoft Academic Search

Liquid–liquid–liquid phase transfer catalysis (L–L–L PTC) offers orders of magnitude intensification of rates of reaction and better selectivities than the biphasic PTC. The catalyst-rich middle phase is the main reaction phase. The etherification or alkoxylation of p-chloronitrobenzene (PCNB) was conducted by using alkanol and alkali instead of the metal alkoxide. A kinetic model is presented and validated.

G. D Yadav; Suguna S Naik

2001-01-01

114

Electrokinetics over liquid/liquid interfaces  

NASA Astrophysics Data System (ADS)

Since liquid-liquid interfaces flow in response to an applied stress, one might expect electrokinetic flows at liquid-liquid interfaces to be significantly higher than over liquid-solid interfaces. The earliest predictions for the electrophoretic mobility of charged mercury drops -- distinct approaches by Frumkin and Levich (1946), and Booth (1951) -- differed by O(a/?D), where a is the radius of the drop and ?D is the Debye screening length. Seeking to reconcile this rather striking discrepancy, Levine (1973) showed double-layer polarization to be the key ingredient. Without a physical mechanism by which electrokinetic effects are enhanced, however, it is difficult to know how general the enhancement is -- whether it holds only for liquid metal surfaces, or more generally, for all liquid/liquid surfaces. By considering a series of systems in which a planar metal strip is coated with either a liquid metal or liquid dielectric, we show that the central physical mechanism behind the enhancement predicted by Frumkin and Levich (1946) is the presence of an unmatched electrical stress upon the electrolyte-liquid interface, which establishes a Marangoni stress on the droplet surface and drives it into motion. The source of the unbalanced electrokinetic stress on a liquid metal surface is clear -- metals represent equipotential surfaces, so no field exists to drive an equal and opposite force on the surface charge. This might suggest that liquid metals represent a unique system, since dielectric liquids can support finite electric fields, which might be expected to exert an electrical stress on the surface charge that balances the electric stress. We demonstrate, however, that electrical and osmotic stresses on relaxed double-layers internal to dielectric liquids precisely cancel, so that internal electrokinetic stresses generally vanish in closed, ideally polarizable liquids. The enhancement for liquid mercury drops can thus be expected quite generally over clean, ideally polarizable liquid drops. More broadly, the ability to reliably engineer liquid interfaces in microfluidic systems, then, may provide a path to significantly enhanced electrokinetic flows.

Squires, Todd M.

2011-11-01

115

NEUROMARKETING ET NEUROSCIENCES AU SERVICE DES PUBLICITAIRES  

E-print Network

1 NEUROMARKETING ET NEUROSCIENCES AU SERVICE DES PUBLICITAIRES : QUESTIONNEMENTS ETHIQUES Didier neuromarketing et des neurosciences au service des publicitaires soulève immanquablement des questions éthiques débats éthiques entre les personnes adeptes du neuromarketing (les "pro-neuromarketing") et les "anti-neuromarketing

Paris-Sud XI, Université de

116

Die „cortinähnliche“ Wirkung des g-Strophanthins  

Microsoft Academic Search

An normalen Kaninchen bewirkten höhere Dosen des Strophanthins eine Steigerung des Blutchlorid-, Natrium- und Zuckerspiegels und eine Erniedrigung der Plasmakaliumkonzentration. An normalen Hunden wird der Chlorid- und Natriumgehalt des Blutes auf Strophanthin erhöht, der Kaliumgehalt des Plasmas gesenkt. Die mit dem Harn ausgeschiedenen Natriummengen sanken nach Strophanthinbehandlung ab und gleichzeitig nahm die Kaliumausscheidung stark zu. Im Lichte dieser auf den

E. Varga; D. Bagdy; L. Kesztyüs

1949-01-01

117

Service social des tudiants Les Assistantes Sociales  

E-print Network

Service social des étudiants Les Assistantes Sociales : * vous informent sur la vie à l'Université et ses conditions matérielles : bourses, logement, budget, prêt, législation sociale social * effectuent, avec votre accord, des interventions, des liaisons auprès des organismes (CROUS

Di Girolami, Cristina

118

Le microscope des mathmaticiens Tribune du Net  

E-print Network

Le microscope des mathématiciens Tribune du Net Guillaume Theyssier Laboratoire de Mathématiques chercheur TIC = Technologies de l'Information et de la Communication 2 ordinateur : le microscope des des articles : web Démonstration... #12;Ordinateur : Le microscope des mathématiciens Rappels

Theyssier, Guillaume

119

CHRONIQUE: RGLEMENT ALTERNATIF DES CONFLITS Note prliminaire  

E-print Network

CHRONIQUE: R�GLEMENT ALTERNATIF DES CONFLITS Note pr�liminaire Les m�thodes alternatives de r�glement des conflits sont de plus en plus jug�es int�ressantes tant pour les justiciables que pour le syst�judiciaris� des conflits�. Ce forum, multidisciplinaire, regroupait des participants provenant du droit, de la

Spino, Claude

120

Look-alike Liquids  

NSDL National Science Digital Library

Learners add drops of four liquids (water, alcohol, salt water, and detergent solution) to different surfaces and observe the liquids' behavior. Learners will see that liquids have characteristic properties which can be used for identification. In the related activity, " Developing Tests to Distinguish Between Similar-Looking Liquids" (see related resources), learners identify an unknown based on these properties.

Kessler, James H.; Galvan, Patricia M.

2007-01-01

121

Ionic Liquids Database- (ILThermo)  

National Institute of Standards and Technology Data Gateway

SRD 147 Ionic Liquids Database- (ILThermo) (Web, free access)   IUPAC Ionic Liquids Database, ILThermo, is a free web research tool that allows users worldwide to access an up-to-date data collection from the publications on experimental investigations of thermodynamic, and transport properties of ionic liquids as well as binary and ternary mixtures containing ionic liquids.

122

Traveling Through Different Liquids  

NSDL National Science Digital Library

Learners observe and record what happens when they manipulate bottles containing a liquid (water or corn syrup) and one or more objects (screw, nail, paper clip). They should observe differences in how quickly the objects fall in the different liquids. This lesson builds on what learners have studied in previous lessons, Exploring Liquids and Exploring How Liquids Behave.

Janulaw, Sharon

2010-01-01

123

Des Moines Water Works  

NSDL National Science Digital Library

Users can access information about educational programs and materials for teachers and students, including tours, traveling exhibits and presentations by the staff of the Des Moines Water Works. "Water Trunks", which contain water-related literature, books, science experiments, videos, games, CD-ROMs, hands-on activities, picture cards, career information, and a teacher resource book, are available to order. There are also links to other water websites, a teachers' newsletter and pollution prevention tips for classroom use and for the general public.

2001-01-01

124

Thermally conductive of nanofluid from surfactant doped polyaniline nanoparticle and deep eutectic ionic liquid  

NASA Astrophysics Data System (ADS)

Nanofluid is a colloidal suspension of nano-size particles in a fluid. Spherical shape dodecylbenzenesulfonic acid doped polyaniline (DBSA-PANI) nanoparticles were synthesized via reverse micellar polymerization in isooctane with average size of 50 nm- 60 nm. The aim of study is to explore the possibility of using deep eutectic ionic liquid (DES) as a new base fluid in heat transfer application. DES was prepared by heating up choline chloride and urea with stirring. DES based nanofluids containing DBSA-PANI nanoparticles were prepared using two-step method. Thermal conductivity of nanofluids was measured using KD2 Pro Thermal Properties Analyzer. When incorporated with DBSA-PANI nanoparticles, DES with water was found to exhibit a bigger increase in thermal conductivity compared to that of the pure DES. The thermal conductivity of DES with water was increased by 4.67% when incorporated with 0.2 wt% of DBSA-PANI nanoparticles at 50°C. The enhancement in thermal conductivity of DES based nanofluids is possibly related to Brownian motion of nanoparticles as well as micro-convection of base fluids and also interaction between dopants and DES ions.

Siong, Chew Tze; Daik, Rusli; Hamid, Muhammad Azmi Abdul

2014-09-01

125

Liquids intermediate between "molecular" and "ionic" liquids: liquid ion pairs?  

PubMed

Ionic liquids comprised of tetradecyltrihexyl- and tetrabutyl-phosphonium cations paired with chloride or sulfonyl amide anions exhibit properties that reflect strong ion association, including comparatively low viscosity as well as a degree of volatility, and hence exemplify an interesting intermediate state between true ionic and true molecular liquids. PMID:18217657

Fraser, Kevin J; Izgorodina, Ekaterina I; Forsyth, Maria; Scott, Janet L; MacFarlane, Douglas R

2007-10-01

126

Introduction to DES Overview of the DES Algorithm  

E-print Network

Encryption Standard (DES) encrypts blocks of size 64 bit. � Developed by IBM based on the cipher Lucifer;! The Permutation P 4.Permutation P � Bitwise permutation. � Introduces diffusion. � Output bits of one S-Box effect

127

Fiabilité des structures mécaniques adaptatives: effet de la panne des actionneurs ou des capteurs sur la stabilité  

NASA Astrophysics Data System (ADS)

Ces dernières décennies, des activités significatives dans le monde étaient dirigées autour du contrôle actif. Le but de ces recherches était essentiellement d'améliorer les performances, la fiabilité et la sécurité des systèmes. Notamment dans le cas des structures soumises à des vibrations aléatoires. D'importants travaux ont été consacré à l'utilisation des “matériaux intelligents” comme capteurs et actionneurs. Cette article propose l'analyse de la fiabilité des systèmes mécaniques en étudiant les pannes des actionneurs ou des capteurs. L'effet de ces pannes sur la stabilité et la performance du système y est démontré. Les méthodologies de conception y sont rappelées. Des exemples numériques sont fournis à travers le contrôle d'un panneau sous chargement dynamique pour illustrer la méthode proposée.

Fall, H.; Charon, W.; Kouta, R.

2002-12-01

128

L'EFFET THERMOLECTRIQUE HOMOGNE, EN PARTICULIER DANS LE MERCURE ET L'INFLUENCE DES IONS TRANGERS (1)  

E-print Network

L'EFFET THERMO�LECTRIQUE HOMOG�NE, EN PARTICULIER DANS LE MERCURE ET L'INFLUENCE DES IONS �TRANGERS Magnus et d'autres sur le mercure liquide amènent à la conclusion, que les résultats antérieurs n'asymétrie nécessaire est facilement obtenue au moyen d'un étranglement du circuit métallique. Dans le mercure liquide

Boyer, Edmond

129

L'IMPLANTATION DES DIFICES CULTUELS DES TMOINS DE  

E-print Network

), Oyonnax, Rodez, Montceau-les-Mines, Bruay-en-Artois (Pas-de-Calais). Le mouvement des �tudiants de la dans le prosélytisme en France. Mais le russellisme s'est tout de même développé dans le Nord-Pas-de-Calais. Russell attribuait ce fait à l'influence « néfaste » des catholiques et il n'investissait pas beaucoup

Paris-Sud XI, Université de

130

BOURSE MUSODOC Facult des arts et des sciences  

E-print Network

BOURSE MUS�ODOC Faculté des arts et des sciences Doctorat La bourse Muséodoc est offerte chaque muséologie. La bourse vise à encourager le développement et la réalisation de projets de recherche créatifs candidature plusieurs années de suite. Toutefois, la bourse ne peut être attribuée qu'une seule fois à la même

Parrott, Lael

131

Caractrisation des systmesCaractrisation des systmes industriels  

E-print Network

Chapitre 3 Caractérisation des systèmesCaractérisation des systèmes industriels Aymeric Histace 1 Plan 1. Performances d'un système industriel 2. Etude temporelle 3. Etude fréquentielleq Aymeric comment concrètement les prévoir ou les mesurer pratiquement pour un système industriel donné. Aymeric

Histace, Aymeric

132

Liquid level detector  

DOEpatents

A liquid level detector for low pressure boilers. A boiler tank, from which vapor, such as steam, normally exits via a main vent, is provided with a vertical side tube connected to the tank at the desired low liquid level. When the liquid level falls to the level of the side tube vapor escapes therethrough causing heating of a temperature sensitive device located in the side tube, which, for example, may activate a liquid supply means for adding liquid to the boiler tank. High liquid level in the boiler tank blocks entry of vapor into the side tube, allowing the temperature sensitive device to cool, for example, to ambient temperature.

Grasso, A.P.

1984-02-21

133

Liquid level detector  

DOEpatents

A liquid level detector for low pressure boilers. A boiler tank, from which apor, such as steam, normally exits via a main vent, is provided with a vertical side tube connected to the tank at the desired low liquid level. When the liquid level falls to the level of the side tube vapor escapes therethrough causing heating of a temperature sensitive device located in the side tube, which, for example, may activate a liquid supply means for adding liquid to the boiler tank. High liquid level in the boiler tank blocks entry of vapor into the side tube, allowing the temperature sensitive device to cool, for example, to ambient temperature.

Grasso, Albert P. (Vernon, CT)

1986-01-01

134

Kinetics and Control of Liquid-Liquid Transition  

NASA Astrophysics Data System (ADS)

Recently it was revealed that even a single-component liquid can have more than two liquid states. The transition between these liquid states is called "liquid-liquid transition". This phenomenon has attracted a considerable attention because of its counter-intuitive character and the fundamental importance for our understanding of the liquid state of matter. The connection between the liquid-liquid transition and polyamorphism is also an interesting issue. In many cases, liquid-liquid transitions exist in a region which is difficult to access experimentally. Because of this experimental difficulty, the physical nature and kinetics of the transition remains elusive. However, a recent finding of liquid-liquid transition in molecular liquids opens up a possibility to study the kinetics in detail. Here we report the first detailed comparison between experiments and a phenomenological theory for the liquid-liquid transition of a molecular liquid, triphenyl phosphite. Both nucleation-growth-type and spinodal-decomposition-type liquid-liquid transformation are remarkably well reproduced by a two-order-parameter model of liquid that regards the liquid-liquid transition as the cooperative formation of locally favored structures. This may shed new light on the nature and the dynamics of the liquid-liquid transition. We also show evidence that this second order parameter controls the fragility of the liquid. We also discuss a possibility of controlling liquid-liquid transition by spatial confinement. Remaining open questions on the nature of the transition are also discussed.

Tanaka, Hajime; Kurita, Rei; Murata, Ken-ichiro

2008-02-01

135

Titel des Moduls: Schallmesstechnik und  

E-print Network

Titel des Moduls: Schallmesstechnik und Signalverarbeitung (Measurement Technique and Signal. Fortgeschrittene" und/oder mit Modulen TA 2 und TA 6 "Noise and Vibration Control", "Advanced Noise and Vibration

Berlin,Technische Universität

136

Vecteurs Singuliers des Theories des Champs Conformes Minimales  

NASA Astrophysics Data System (ADS)

En 1984 Belavin, Polyakov et Zamolodchikov revolutionnent la theorie des champs en explicitant une nouvelle gamme de theories, les theories quantiques des champs bidimensionnelles invariantes sous les transformations conformes. L'algebre des transformations conformes de l'espace-temps presente une caracteristique remarquable: en deux dimensions elle possede un nombre infini de generateurs. Cette propriete impose de telles conditions aux fonctions de correlations qu'il est possible de les evaluer sans aucune approximation. Les champs des theories conformes appartiennent a des representations de plus haut poids de l'algebre de Virasoro, une extension centrale de l'algebre conforme du plan. Ces representations sont etiquetees par h, le poids conforme de leur vecteur de plus haut poids, et par la charge centrale c, le facteur de l'extension centrale, commune a toutes les representations d'une meme theorie. Les theories conformes minimales sont constituees d'un nombre fini de representations. Parmi celles-ci se trouvent des theories unitaires dont les representation forment la serie discrete de l'algebre de Virasoro; leur poids h a la forme h_{p,q}(m)=[ (p(m+1) -qm)^2-1] (4m(m+1)), ou p,q et m sont des entiers positifs et p+q<= m+1. L'entier m parametrise la charge centrale: c(m)=1 -{6over m(m+1)} avec n>= 2. Ces representations possedent un sous-espace invariant engendre par deux sous-representations avec h_1=h_{p,q} + pq et h_2=h_{p,q} + (m-p)(m+1-q) dont chacun des vecteurs de plus haut poids portent le nom de vecteur singulier et sont notes respectivement |Psi _{p,q}> et |Psi_{m-p,m+1-q}>. . Les theories super-conformes sont une version super-symetrique des theories conformes. Leurs champs appartiennent a des representation de plus haut poids de l'algebre de Neveu-Schwarz, une des deux extensions super -symetriques de l'algebre de Virasoro. Les theories super -conformes minimales possedent la meme structure que les theories conformes minimales. Les representations sont elements de la serie h_{p,q}= [ (p(m+2)-qm)^2-4] /(8m(m+2)) ou p,q et m sont des entiers positifs, p et q etant de meme parite, et p+q<= m+2. La charge centrale est donnee par c(m)={3over 2}-{12over m(m+2)} avec m >= 2. Les vecteurs singuliers | Psi_{p,q}> et |Psi_{m-p,m+2-q} > sont respectivement de poids h _{p,q}+pq/2 et h_ {p,q}+(m-p)(m+2-q)/2.. Les vecteurs singuliers ont une norme nulle et on doit les eliminer des representations pour que celles -ci soient unitaires. Cette elimination engendrent des equations (super-)differentielles qui dependent directement de la forme explicite des vecteurs singuliers et auxquelles doivent obeir les fonctions de correlations de la theorie. Ainsi la connaissance de ces vecteurs singuliers est intimement reliee au calcul des fonctions de correlation. Les equations definissant les vecteurs singuliers forment un systeme lineaire surdetermine dont le nombre d'equations est de l'ordre de N(pq), le nombre de partitions de l'entier pq. Puisque les vecteurs singuliers jouent un role capital en theorie conforme, il est naturel de chercher des formes explicites pour les vecteurs (ou pour des familles infinies de ceux -ci). Nous donnons ici la forme explicite pour la famille infinie de vecteurs singuliers ayant un de ses indices egal a 1, pour les algebres de Virasoro et de Neveu-Schwarz. Depuis ces decouvertes, d'autres techniques de construction des vecteurs singuliers ont ete developpees, dont celle de Bauer, Di Francesco, Itzykson et Zuber pour l'algebre de Virasoro qui reproduit directement l'expression explicite des vecteurs singuliers |Psi _{1,q}> et |Psi_{p,1}>. Ils ont utilise l'algebre des produits d'operateurs et la fusion entre representations irreductibles pour engendrer des relations de recurence produisant les vecteurs singuliers. Dans le dernier chapitre de cette these nous adaptons cet algorithme a la construction des vecteurs singuliers de l'algebre de Neveu-Schwarz.

Benoit, Louis

137

JOURNAL DE PHYSIQUE Collogue C2, supplement au n 3, Tome 40, mars 1979, page C2-26 CONVERSION ELECTRON MOSSBAUER SPECTROSCOPY DOWN TO LIQUID HELIUM TEMPERATURE  

E-print Network

measurements to be performed down to liquid helium temperature. The conversion electron detector operates under ELECTRON MOSSBAUER SPECTROSCOPY DOWN TO LIQUID HELIUM TEMPERATURE 0. Massenet Groupe des Transitions de electrons uses a gas counter filled with a mixture of helium and methane /1-2/. This method, convenient

Boyer, Edmond

138

Note technique Rgionalisation des scnarios  

E-print Network

dépasser les 35 °C selon les données fournies par notre scénario. Mots clés : cataclysme ; climat ; effet: climate; environment monitoring; France; greenhouse effect; models, theoratical; natural disasters Les de concentration des gaz à effet de serre et des aérosols pour le XXIE siècle [1]. Ces scénarios sont

Ribes, Aurélien

139

Liquid-liquid phase separation in biology.  

PubMed

Cells organize many of their biochemical reactions in non-membrane compartments. Recent evidence has shown that many of these compartments are liquids that form by phase separation from the cytoplasm. Here we discuss the basic physical concepts necessary to understand the consequences of liquid-like states for biological functions. PMID:25288112

Hyman, Anthony A; Weber, Christoph A; Jülicher, Frank

2014-10-11

140

Un accumulateur echangeur de chaleur hybride pour la gestion simultanee des energies solaire et electrique  

NASA Astrophysics Data System (ADS)

Cette etude porte sur la conception d'un accumulateur echangeur de chaleur hybride (AECH) pour la gestion simultanee des energies solaire et electrique. Un modele mathematique reposant sur les equations de conservation de la quantite d'energie est expose. Il est developpe pour tester differents materiaux de stockage, entre autres, les materiaux a changement de phase (solide/liquide) et les materiaux de stockage sensible. Un code de calcul est mis en eeuvre sur ordinateur, puis valide a l'aide des resultats analytiques et numeriques de la litterature. En parallele, un prototype experimental a echelle reduite est concu au laboratoire afin de valider le code de calcul. Des simulations sont effectuees pour etudier les effets des parametres de conception et des materiaux de stockage sur le comportement thermique de l'AECH et sur la consommation d'energie electrique. Les resultats des simulations sur quatre mois d'hiver montrent que la paraffine n-octadecane et l'acide caprique sont deux candidats souhaitables pour le stockage d'energie destine au chauffage des habitats. L'utilisation de ces deux materiaux dans l'AECH permet de reduire la consommation d'energie electrique de 32% et d'aplanir le probleme de pointe electrique puisque 90% de l'energie electrique est consommee durant les heures creuses. En plus, en adoptant un tarif preferentiel, le calcul des couts lies a la consommation d'energie electrique montre que le consommateur adoptant ce systeme beneficie d'une reduction de 50% de la facture d'electricite.

Ait Hammou, Zouhair

141

Liquid medication administration  

MedlinePLUS

... easily. Oral syringes have some advantages for giving liquid medications. They are accurate. They are easy to ... cups are also a handy way to give liquid medications. However, dosing errors have occurred with them. ...

142

Zero gravity liquid mixer  

NASA Technical Reports Server (NTRS)

An apparatus for mixing liquids under conditions of zero gravity is disclosed. The apparatus is comprised of a closed reservoir for the liquids, with a means for maintaining a positive pressure on the liquids in the reservoir. A valved liquid supply line is connected to the reservoir for supplying the reservoir with the liquids to be mixed in the reservoir. The portion of the reservoir containing the liquids to be mixed is in communication with a pump which alternately causes a portion of the liquids to flow out of the pump and into the reservoir to mix the liquids. The fluids in the reservoir are in communication through a conduit with the pump which alternately causes a portion of the fluids to flow out of the pump and into the sphere. The conduit connecting the pump and sphere may contain a nozzle or other jet-forming structure such as a venturi for further mixing the fluids.

Booth, F. W.; Bruce, R. A. (inventors)

1973-01-01

143

Frustration in bilayers and topologies of liquid crystals of amphiphilic molecules  

E-print Network

683 Frustration in bilayers and topologies of liquid crystals of amphiphilic molecules J. F. Sadoc dicembre 1985) Résumé. - Les molécules amphiphiles construisent des films fluides symétriques, bicouches. - Amphiphilic molecules are well-known for their ability to build symmetric fluid films, or bilayers, most often

Paris-Sud XI, Université de

144

Altération des sulfures des granulats dans les chaussées  

NASA Astrophysics Data System (ADS)

Sulfides present in hornsfeld aggregates, used in light pavanent construction in contact with humid air alter rapidly. Crystallisation of sulfates at the interface of bitumastic material and sub-base creates serious problems (intumescence and crazing) that can lead to a total reconstruction of the project (roads, sidewalks, sports areas, etc). The sulfides in the aggregates and the sulfates produced due to alteration are studied by SEM and XRD. The results show that the intensity of this phenomenon is linked to the nature and the crystallinity of the sulfides. The evolution of the sulfates formed during this alteration process is slow and complex. In new pavements (3 years) the sulfates have a pulverised appearance and consist mostly of epsomite, associated with pickeringite and halotrichite. In older pavements (20 years) the sulfates form a fibrous concretion consisting of pickeringite and small quantities of halotrichite. Les sulfures présents dans les granulats élaborés à partir de cornéen nes s'altèrent rapidement dans les chaussées légères en présence d'air humide. La cristallisation des sulfates à l'interface enrobé-couche de fondation crée des désordres si importants (intumescences, faiençage) qu'il est bien souvent nécessaire d'assurer la réfection totale des ouvrages (routes, trottoirs, plateaux sportifs...). Les sulfures des granulats et les sulfates issus du processus d'altération ont été étudiés par diffractométrie X et examen su Microscope Electronique à Balayage équipé de microanalyse X. Les résultats montrent que !intensité des désordres est liée à la nature et à la cristallinité des sulfures. Les sulfates formés évoluent su cours du processus d'altération qui est long et complexe. Dans les chaussées récentes (3 ans) ils ont un aspect pulvérulent et sont constitués d'epsomite dominante associée à de la pickeringite et à de l'halotrichite. Dans les chaussées plus anciennes (20 ans) ils forment des concrétions fibreuses constituées de pickeringite et d'une faible quantité d'halotrichite.

Jigorel, A.; Jauberthie, R.

2002-07-01

145

ANALYSE DES DETERMINANTS DE LA GESTION DES RESULTATS : CAS DES FIRMES CANADIENNES FRANCAISES ET TUNISIENNES  

Microsoft Academic Search

L'objectif de cet article est d'analyser l'impact des déterminants de la gestion des résultats en référence aux modèles comptables Anglo-américain et Euro-continental. La France et le Canada sont, respectivement, issus de deux environnements sociaux-économiques différents. La Tunisie a procédé à la réforme de son système comptable pour passer du modèle comptable Euro-continental au modèle comptable Anglo-américain. Néanmoins les traits de

Hakim Ben Othman; Daniel Zéghal

2006-01-01

146

High Performance Liquid Chromatography  

E-print Network

HPLC - 1 High Performance Liquid Chromatography HPLC MEASUREMENT OF POLYCYCLIC AROMATIC HYDROCARBONS IN CIGARETTE SMOKE Last updated: June 17, 2014 #12;HPLC - 2 High Performance Liquid Chromatography identify as many PAH as possible in cigarette smoke using high performance liquid chromatography (HPLC

Nizkorodov, Sergey

147

Liquid detection circuit  

DOEpatents

Herein is a circuit which is capable of detecting the presence of liquids, especially cryogenic liquids, and whose sensor will not overheat in a vacuum. The circuit parameters, however, can be adjusted to work with any liquid over a wide range of temperatures.

Regan, Thomas O. (North Aurora, IL)

1987-01-01

148

Nr. 057 / 2014 // 3. April 2014 Knstlerische Darstellung des ,,Giant impact", des Aufpralls eines kleineren  

E-print Network

Nr. 057 / 2014 // 3. April 2014 1/7 Künstlerische Darstellung des ,,Giant impact", des Aufpralls freundlicher Genehmigung des NASA/Jet Propulsion Labors am California Institute of Technology. In ,,Nature- zeichnet. Der ,,Giant impact" und seine Folgen: Die Entstehung des Mondes und Veränderungen im Erdmantel

Ullmann, G. Matthias

149

Radiation monitor for liquids  

DOEpatents

A radiation monitor for use with liquids that utilizes air ions created by alpha radiation emitted by the liquids as its detectable element. A signal plane, held at an electrical potential with respect to ground, collects these air ions. A guard plane or guard rings is used to limit leakage currents. In one embodiment, the monitor is used for monitoring liquids retained in a tank. Other embodiments monitor liquids flowing through a tank, and bodies of liquids, such as ponds, lakes, rivers and oceans.

Koster, James E. (Los Alamos, NM); Bolton, Richard D. (Los Alamos, NM)

1999-01-01

150

Radiation monitor for liquids  

DOEpatents

A radiation monitor for use with liquids that utilizes air ions created by alpha radiation emitted by the liquids as its detectable element. A signal plane, held at an electrical potential with respect to ground, collects these air ions. A guard plane or guard rings is used to limit leakage currents. In one embodiment, the monitor is used for monitoring liquids retained in a tank. Other embodiments monitor liquids flowing through a tank, and bodies of liquids, such as ponds, lakes, rivers and oceans. 4 figs.

Koster, J.E.; Bolton, R.D.

1999-03-02

151

Absorption des substances dissoutes dans le milieu, des particules et des produits de la digestion extracellulaire chez Actinia equina  

E-print Network

Absorption des substances dissoutes dans le milieu, des particules et des produits de la digestion. Absorption of substances dissolved in the sea-environment, particles and extra- cellular digestion products with the prey. The transfer (in both directions) of the different absorbed substances between the ecto- derm

Paris-Sud XI, Université de

152

Responsables des Services Administratifs et Financiers  

E-print Network

­ 24 avenue des Landais ­ BP 80026 ­ 63711 Aubière cedex Personnel enseignant et HC (70.11) Marie-Jo BERTHOLET / Suzanne HERNANDEZ Responsable Dominique BESSE (70.16) Gestion des salles, Examens, ADE (70

Sart, Remi

153

FACULT DES SCIENCES HUMAINES ET SOCIALES -SORBONNE  

E-print Network

FACULT� DES SCIENCES HUMAINES ET SOCIALES - SORBONNE LICENCE EN SCIENCES HUMAINES ET SOCIALES ANN�E UNIVERSITAIRE 2013-2014 MENTION SCIENCES DU Vaillant 92100 Boulogne-Billancourt L3, M1 et M2 Faculté des Sciences

Pellier, Damien

154

FACULT DES SCIENCES HUMAINES ET SOCIALES -SORBONNE  

E-print Network

FACULT� DES SCIENCES HUMAINES ET SOCIALES - SORBONNE LICENCE EN SCIENCES HUMAINES ET SOCIALES ANN�E UNIVERSITAIRE 2013-2014 MENTION SCIENCES DE L'�DUCATION L3 Faculté des Sciences humaines et sociales

Pellier, Damien

155

Liquid/Gas Vortex Separator  

NASA Technical Reports Server (NTRS)

Liquid/gas separator vents gas from tank of liquid that contains gas randomly distributed in bubbles. Centrifugal force separates liquid and gas, forcing liquid out of vortex tube through venturi tube. Gas vented through exhaust port. When liquid detected in vent tube, exhaust port closed, and liquid/gas mixture in vent tube drawn back into tank through venturi.

Morris, B. G.

1986-01-01

156

Liquid Wall Chambers  

SciTech Connect

The key feature of liquid wall chambers is the use of a renewable liquid layer to protect chamber structures from target emissions. Two primary options have been proposed and studied: wetted wall chambers and thick liquid wall (TLW) chambers. With wetted wall designs, a thin layer of liquid shields the structural first wall from short ranged target emissions (x-rays, ions and debris) but not neutrons. Various schemes have been proposed to establish and renew the liquid layer between shots including flow-guiding porous fabrics (e.g., Osiris, HIBALL), porous rigid structures (Prometheus) and thin film flows (KOYO). The thin liquid layer can be the tritium breeding material (e.g., flibe, PbLi, or Li) or another liquid metal such as Pb. TLWs use liquid jets injected by stationary or oscillating nozzles to form a neutronically thick layer (typically with an effective thickness of {approx}50 cm) of liquid between the target and first structural wall. In addition to absorbing short ranged emissions, the thick liquid layer degrades the neutron flux and energy reaching the first wall, typically by {approx}10 x x, so that steel walls can survive for the life of the plant ({approx}30-60 yrs). The thick liquid serves as the primary coolant and tritium breeding material (most recent designs use flibe, but the earliest concepts used Li). In essence, the TLW places the fusion blanket inside the first wall instead of behind the first wall.

Meier, W R

2011-02-24

157

The Liquid Crystal Institute  

NSDL National Science Digital Library

The homepage of the Liquid Crystal Institute (LCI) presents gorgeous color images produced from liquid crystal, research overviews, technology invention abstracts, news and conference links, and more. LCI is part of a consortium, selected by the National Science Foundation, based at the Center for Advanced Liquid Crystalline Optical Materials (ALCOM) at Kent State University. The consortium includes Kent State University, Case Western Reserve University, and the University of Akron. ALCOM focuses on interdisciplinary research and development of liquid crystal optoelectronic materials, technology, and consumer products. A few of the liquid crystal studies featured here are fine structure and oily streak defects, magneto-optic response, text display applications, and organic synthesis. One of LCI's projects, the Polymers and Liquid Crystals Textbook, was featured in the December 13, 1996 Scout Report for Science & Engineering The LCI Website is not especially well-organized, but it contains lots of information about liquid crystal technology.

158

Liquid Propellant Manipulated Acoustically  

NASA Technical Reports Server (NTRS)

Fluids are difficult to manage in the space environment. Without gravity, the liquid and gas do not always remain separated as they do in the 1g environment of Earth. Instead the liquid and gas volumes mix and migrate under the influence of surface tension, thermodynamic forces, and external disturbances. As a result, liquid propellants may not be in a useable location or may even form a chaotic mix of liquid and gas bubbles. In the past, mechanical pumps, baffles, and a variety of specialized passive devices have been used to control the liquid and gas volumes. These methods need to be carefully tuned to a specific configuration to be effective. With increasing emphasis on long-term human activity in space there is a trend toward liquid systems that are more flexible and provide greater control. We are exploring new methods of manipulating liquids by using the nonlinear acoustic effects achieved by using beams of highly directed high-intensity acoustic waves.

Oeftering, Richard C.; Chato, David J.; Mann, Adin, III

2003-01-01

159

Nanowire liquid pumps  

NASA Astrophysics Data System (ADS)

The ability to form tiny droplets of liquids and control their movements is important in printing or patterning, chemical reactions and biological assays. So far, such nanofluidic capabilities have principally used components such as channels, nozzles or tubes, where a solid encloses the transported liquid. Here, we show that liquids can flow along the outer surface of solid nanowires at a scale of attolitres per second and the process can be directly imaged with in situ transmission electron microscopy. Microscopy videos show that an ionic liquid can be pumped along tin dioxide, silicon or zinc oxide nanowires as a thin precursor film or as beads riding on the precursor film. Theoretical analysis suggests there is a critical film thickness of ~10 nm below which the liquid flows as a flat film and above which it flows as discrete beads. This critical thickness is the result of intermolecular forces between solid and liquid, which compete with liquid surface energy and Rayleigh-Plateau instability.

Huang, Jian Yu; Lo, Yu-Chieh; Niu, Jun Jie; Kushima, Akihiro; Qian, Xiaofeng; Zhong, Li; Mao, Scott X.; Li, Ju

2013-04-01

160

Liquid Metal Transformers  

E-print Network

The room temperature liquid metal is quickly emerging as an important functional material in a variety of areas like chip cooling, 3D printing or printed electronics etc. With diverse capabilities in electrical, thermal and flowing behaviors, such fluid owns many intriguing properties that had never been anticipated before. Here, we show a group of unconventional phenomena occurring on the liquid metal objects. Through applying electrical field on the liquid metals immersed in water, a series of complex transformation behaviors such as self-assembling of a sheet of liquid metal film into a single sphere, quick mergences of separate metal droplets, controlled self-rotation and planar locomotion of liquid metal objects can be realized. Meanwhile, it was also found that two accompanying water vortexes were induced and reliably swirled near the rotating liquid metal sphere. Further, effects of the shape, size, voltage, orientation and geometries of the electrodes to control the liquid metal transformers were clar...

Sheng, Lei; Liu, Jing

2014-01-01

161

LE BULLETIN DE L'EPI N 58 DES SECONDES ET DES PC EN HISTOIRE-GOGRAPHIE DES "SECONDES" ET DES "PC"  

E-print Network

allumer le PC, mettre la disquette système, mettre la disquette du programme. Avec la multiplication de l : comprendre) ses erreurs (cf. La vie du lac sur PC, ou Esporif sur Nanoréseau). D'autres programmes permettent129 LE BULLETIN DE L'EPI N° 58 DES SECONDES ET DES PC EN HISTOIRE-G�OGRAPHIE DES "SECONDES" ET DES

Paris-Sud XI, Université de

162

Des volcans et des hommes depuis le dernier interglaciaire en Basse Auvergne (Massif Central, France)  

E-print Network

of volcanic activity . In the Massif Central, selected case- studies allow us to discuss the effect of local climatiques quaternaires ont rythmé la différenciation des biotopes. Le volcanisme a brutalement perturbé l et provoqué des modifications brutales des versants et des tracés des cours d'eau : c'est le cas en

Paris-Sud XI, Université de

163

DOSAGE DES LIPIDES DES FCES EXTRACTION SPARE, IMPORTANCE ET COMPOSITION EN ACIDES GRAS  

E-print Network

DOSAGE DES LIPIDES DES F�CES EXTRACTION S�PAR�E, IMPORTANCE ET COMPOSITION EN ACIDES GRAS DES ce travail a été la mise au point d'une méthode de dosage des lipides des fèces qui permette d nécessaire d'en tenir compte dans les calculs de digestibilité. Cependant, dans certains cas, il importe de

Paris-Sud XI, Université de

164

Intensification of Liquid-Liquid Contacting Processes  

E-print Network

different energy sources and were investigated in this dissertation. They include electrostatic liquid spraying based on electric field and a two-disc spinning disc reactor based on high gravity field. Interfacial turbulence plays an important role...

Qiu, Zheyan

2010-09-01

165

Die Gestaltungen des Wahnsinns bei William Shakespeare  

Microsoft Academic Search

Zusammenfassung  Shakespeare gilt als der groe Menschenbeschreiber am Beginn der Neuzeit. Wie bei vielen seiner Zeitgenossen war der Wahnsinn ein ganz zentrales Thema seines Schaffens. Diese Arbeit geht der Frage des kulturgeschichtlichen und gesellschaftlichen Umfeldes nach, aus dem heraus Shakespeare Figuren entwickelt hat, die aus diesem Kontext weit herausragen. Dabei liegt ein wesentlicher Schwerpunkt auf der historischen Semantik des Wortfelds des

Thomas Stompe; Kristina Ritter; Alexander Friedmann

2006-01-01

166

UNIVERSIT DE SHERBROOKE SERVICE DES IMMEUBLES  

E-print Network

UNIVERSIT� DE SHERBROOKE SERVICE DES IMMEUBLES GUIDE DE L'ENTREPRENEUR POUR LES TRAVAUX DE CONSTRUCTION 9 JANVIER 2013 #12;Table des matières Guide de l'entrepreneur ­ Université de Sherbrooke 2 1. PROC�DURE DE CADENASSAGE DES �QUIPEMENTS PAR LE MA�TRE D'OEUVRE (ENTREPRENEUR G�N�RAL

Spino, Claude

167

Lipodystrophies : perceptions et souffrance des personnes atteintes,  

E-print Network

Lipodystrophies : perceptions et souffrance des personnes atteintes, réponses collectives 117 Alice Desclaux, Sokhna Boye 1. INTRODUCTION Les lipodystrophies sont définies par la médecine comme des ailleurs il existe actuellement un débat sur la prévalence des lipodystrophies dans les pays du Sud. Elles

Paris-Sud XI, Université de

168

Comores (Union des) Admission 1 er  

E-print Network

#12;2014-02-25 Secteur mathématiques et informatique Liste complète des programmes en sciences pures demandés Administration des systèmes informatiques Multimédia Programmation2014-02-25 Comores (Union des) Admission 1 er cycle Programmes à capacité d'accueil limitée

Montréal, Université de

169

Alfred Adler: Der Sinn des Lebens  

Microsoft Academic Search

Die Meinung des Individuums vom Sinn des Lebens ist in letzter Linie die Richtschnur für sein Denken, Fühlen und Handeln.\\u000a Der wahre Sinn des Lebens aber zeigt sich in dem Widerstand, der sich dem unrichtig handelnden Individuum entgegensetzt“ (S.\\u000a 39).

Dorit Hejze

170

LE JOURNAL DE PHYSIQUE L'ARRANGEMENT DES PARTICULES FLOTTANT SUR DU MERCURE,  

E-print Network

LE JOURNAL DE PHYSIQUE i - ET LE RADIUM . L'ARRANGEMENT DES PARTICULES FLOTTANT SUR DU MERCURE-dessus ou au-dessous du champ induc- teur. Si le mercure lui même est électrisé, il n'y a un arrangement que quelconques, grains de poussière ou semences d'une plante, sur la surface d'un liquide comme le mercure, sans

Boyer, Edmond

171

Monogroove liquid heat exchanger  

NASA Technical Reports Server (NTRS)

A liquid supply control is disclosed for a heat transfer system which transports heat by liquid-vapor phase change of a working fluid. An assembly (10) of monogroove heat pipe legs (15) can be operated automatically as either heat acquisition devices or heat discharge sources. The liquid channels (27) of the heat pipe legs (15) are connected to a reservoir (35) which is filled and drained by respective filling and draining valves (30, 32). Information from liquid level sensors (50, 51) on the reservoir (35) is combined (60) with temperature information (55) from the liquid heat exchanger (12) and temperature information (56) from the assembly vapor conduit (42) to regulate filling and draining of the reservoir (35), so that the reservoir (35) in turn serves the liquid supply/drain needs of the heat pipe legs (15), on demand, by passive capillary action (20, 28).

Brown, Richard F. (Inventor); Edelstein, Fred (Inventor)

1990-01-01

172

DEVELOPPEMENT DES MARCHES FINANCIERS ET EVALUATION DES ACTIFS BANCAIRES  

E-print Network

du système financier, nous nous appuyons sur l'hypothèse des coûts politiques (Watts et Zimmerman, 1986). 1.1 Les asymétries d'information L'évaluation au sein du secteur bancaire revêt un caractère

Paris-Sud XI, Université de

173

Facult des arts et des sciences Dpartement de littrature compare  

E-print Network

, supports, modes de production des textes, modes de stockage et de distribution, moyens et techniques d aborder les transformations techniques qui surgissent actuellement tout autour de nous et qui contribuent et offre même la possibilité d'interroger l'avenir proche. Ce long détour historique permet donc de

Parrott, Lael

174

CROISSANCE DES TISSUS DU RAT ET QUALIT DES PROTINES ALIMENTAIRES;  

E-print Network

(gluten de blé), les autres avec des protéines de bonne qualité (farine de hareng), a été étudiée en mauvaise qualité (gluten de blé). Nous entendons par « carcasse » l'ensemble du corps de l'animal, moins le

Paris-Sud XI, Université de

175

Caractrisation des scheresses des sols en France et changement climatique.  

E-print Network

over France by using a climatological reanalysis of the Safran/Isba/Modcou Isba suite (SIM) since 1958 hydrométéorologique Safran-Isba-Modcou (SIM) depuis 1958. Des indices standardisés « Standardized Precipitation Index monitoring and used to assess the exceptional drought of spring 2011. These indices were also calculated

Paris-Sud XI, Université de

176

LA SPECTRORADIOMTRIE, OUTIL D'TUDE DES IMPACTS DES REJETS  

E-print Network

and wastes are oxidized thus generating acid mining drainage (AMD) capable to mobilize and release heavy à stériles sont soumis à une oxydation générant ainsi des eaux acides (Drainage Minier Acide ou DMA contamination probable du lac Ichkeul. Mots clés : rejets miniers, drainage minier acide, spectroradiométrie

Boyer, Edmond

177

Amlioration des plantes Evolution des caractristiques de la graine  

E-print Network

'évolution de l'humidité du capitule et des graines de 25 variétés de tournesol (Helianthus annuus L.), de la of 25 sunflower (Helianthus annuus L.) varieties were followed from flowering to maturity, the oil

Paris-Sud XI, Université de

178

FACULT DES ARTS ET DES SCIENCES DPARTEMENT DE COMMUNICATION  

E-print Network

) 400-2578 Courrier électronique : carole.groleau@umontreal.ca Coordonnateur des stages : Frédéric Truax Bureau B-415 Téléphone : (514) 343-6111 poste 2763 Télécopieur : (514) 400-2578 Courrier électronique bidisciplinaire en Bureau B-426 communication et politique Courrier électronique : odette

Parrott, Lael

179

FACULT DES ARTS ET DES SCIENCES DPARTEMENT DE COMMUNICATION  

E-print Network

) 400-2578 Courrier électronique : carole.groleau@umontreal.ca Coordonnateur des stages : Frédéric Truax Bureau B-415 Téléphone : (514) 343-6111 poste 2763 Télécopieur : (514) 400-2578 Courrier électronique communication organisationnelle Gabrielle C. Poirier Bureau : B-428 Courrier électronique : gabrielle

Parrott, Lael

180

FACULT DES ARTS ET DES SCIENCES DPARTEMENT DE COMMUNICATION  

E-print Network

) 400-2578 Courrier électronique : carole.groleau@umontreal.ca Coordonnateur des stages : Frédéric Truax Bureau B-415 Téléphone : (514) 343-6111 poste 2763 Télécopieur : (514) 400-2578 Courrier électronique communication organisationnelle Magali Demers Bureau : B-427 Courrier électronique : magali

Parrott, Lael

181

Facult des arts et des sciences Dpartement de science politique  

E-print Network

(r�)imagin�s Ukraine, Moldova Cours 7 Notre langue... et le statut des russophones Estonie, Ukraine. Gagaouzes (Moldova), Russes et Tatars de Crim�e (Ukraine) Cours 12 S�paratisme sur les territoires 13 Les acteurs externes et les conflits Transnistrie (Moldova et la Russie, la Roumanie, l

Parrott, Lael

182

Trouver des solutions cratives des problmes de toutes  

E-print Network

'offre l'informatique. Informatique Au-delà de la programmation > Vous souhaitez travailler dans l'un des. Ce programme, qui combine la génomique et l'informatique, est le seul offert aux quatre cycles d de l'informatique, qui lui sont de plus en plus indissociables. L'approche numérique de ce programme

Montréal, Université de

183

Modification of liquid hydrocarbons  

SciTech Connect

Improved rate of dissolution in liquid hydrocarbon fuels, of specified tert-butylstyrene copolymers capable of imparting anti-misting characteristics to the fuel, is obtained when the copolymer, following its production by aqueous emulsion polymerization of the monomers, is isolated from the resulting latex by a process of flocculation, separation, washing and drying at moderate temperatures. The copolymer thus isolated is advantageously incorporated in the liquid fuel in the form of a slurry with a hydroxylic liquid and an amine.

Roberts, T. S.; Waite, F. A.

1985-09-24

184

Icosahedral order in liquids  

SciTech Connect

The possibility of icosahedral order in liquids and its role in glass transition is discussed in a broad context of statistical mechanics of liquid. It is pointed out that the structures of glasses and liquids are described both in terms of the topology of atomic bond networks as well as the local distortion of the atomic bonds. While topology plays a dominant role in covalent glasses, local distortion is likely to be more important for metallic glasses.

Egami, Takeshi [ORNL

2007-01-01

185

Transport quantique dans des nanostructures  

NASA Astrophysics Data System (ADS)

Quantum transport in nanostructures This work is devoted to the design, fabrication and magnetotransport investigations of mesoscopic devices. The sample are obtain by e-beam lithography and the measurements are performed at low temperature in a dilution refrigerator in the presence of a magnetic field. We have used MBE grown AlGaAs/GaAs heterojonctions as starting material to fabricate a bipartite tiling of rhombus called mathcal{T}3 lattice. We observe for the first time large amplitude h/e oscillations in this network as compared to the one measured in square lattices of similar size. These oscillations are the signature of a recently predited localization phenomenon induced by Aharonov-Bohm interferences on this peculiar topology. For particular values of the magnetic field the propagation of the electron wave function is bounded in a small number of cells, called Aharonov-Bohm cages. More strikingly, at high magnetic field, h/2e oscillations appear whose amplitude can be much higher than the fundamental period. Their temperature dependence is similar to that of the h/e signal. These observations withdraw a simple interpretation in terms of harmonics generation. The origin of this phenomenon is still unclear and needs more investigations. The influence electrical width of the wire defining the network and so the rule of the number of channels can be studied using a gate deposited over the lattice. In particular we have measured the amplitude dependence of the h/e and h/2e signal versus the gate voltage. Ce travail est consacré à la réalisation d'échantillons mésoscopiques à partir de la lithographie électronique ainsi qu'à leur caractérisation à très basse température en magnétotransport. Nous avons pour cela exploité le gaz bidimensionnel d'électrons situé à l'interface d'une hétérojonction AlGaAs/GaAs pour réaliser un réseau de boucle d'une géométrie particulière baptisée la géométrie mathcal{T}3. Nous avons observé sur cette structure des oscillations de conductance en fonction du flux du champ magnétique de période h/e dont l'amplitude est beaucoup plus importante que celle mesurée sur un réseau carré de même dimension. Cette différence constitue une signature d'un effet de localisation induit par le champ magnétique sur la topologie mathcal{T}3. Pour des valeurs spécifiques du champ magnétique, du fait des interférences destructives Aharonov-Bohm, la propagation des fonctions d'ondes est limitée à un ensemble fini de cellule du réseau appelé cage. De la dépendance en température des oscillations de période h/e mesurées sur le réseau mathcal{T}3 nous avons tiré une longueur caractéristique qui peut être rattachée au périmètre des cages. Un phénomène inattendu fut l'observation, pour des champs magnétiques plus importants, d'un doublement de fréquence des oscillations. Ces oscillations de période h/2e pouvant avoir une amplitude supérieure aux oscillations de période h/e, une interprétation en terme d'harmonique n'est pas possible. Enfin, l'influence de la largeur électrique des fils constituant le réseau et donc celle du nombre de canaux par brin a été étudiée en réalisant des grilles électrostatique. Les variations de l'amplitude des signaux en h/e et h/2e en fonction de la tension de grille ont été mesurés.

Naud, C.

2002-09-01

186

Liquid level detector  

SciTech Connect

A liquid level sensor having a pair of upright conductors spaced by an insulator defining a first high resistance path between the conductors. An electrically conductive path is interposed between the upright conductors at a discrete location at which liquid level is to be measured. It includes a liquid accessible gap of a dimension such that the electrical resistance across the conductor when the gap is filled with the liquid is detectably less than when the gap is emptied. The conductor might also be physically altered by temperature changes to serve also as an indicator of elevated temperature.

Tokarz, Richard D. (West Richland, WA)

1982-01-01

187

Liquid Crystal Optofluidics  

SciTech Connect

By employing anisotropic fluids and namely liquid crystals, fluid flow becomes an additional degree of freedom in designing optofluidic devices. In this paper, we demonstrate optofluidic liquid crystal devices based on the direct flow of nematic liquid crystals in microfluidic channels. Contrary to previous reports, in the present embodiment we employ the effective phase delay acquired by light travelling through flowing liquid crystal, without analysing the polarisation state of the transmitted light. With this method, we demonstrate the variation in the diffraction pattern of an array of microfluidic channels acting as a grating. We also discuss our recent activities in integrating mechanical oscillators for on-chip peristaltic pumping.

Vasdekis, Andreas E.; Cuennet, J. G.; Psaltis, D.

2012-10-11

188

Liquid Metal Transformers  

E-print Network

The room temperature liquid metal is quickly emerging as an important functional material in a variety of areas like chip cooling, 3D printing or printed electronics etc. With diverse capabilities in electrical, thermal and flowing behaviors, such fluid owns many intriguing properties that had never been anticipated before. Here, we show a group of unconventional phenomena occurring on the liquid metal objects. Through applying electrical field on the liquid metals immersed in water, a series of complex transformation behaviors such as self-assembling of a sheet of liquid metal film into a single sphere, quick mergences of separate metal droplets, controlled self-rotation and planar locomotion of liquid metal objects can be realized. Meanwhile, it was also found that two accompanying water vortexes were induced and reliably swirled near the rotating liquid metal sphere. Further, effects of the shape, size, voltage, orientation and geometries of the electrodes to control the liquid metal transformers were clarified. Such events are hard to achieve otherwise on rigid metal or conventional liquid spheres. This finding has both fundamental and practical significances which suggest a generalized way of making smart soft machine, collecting discrete metal fluids, as well as flexibly manipulating liquid metal objects including accompanying devices.

Lei Sheng; Jie Zhang; Jing Liu

2014-01-30

189

Facile Catalyst Separation Without Water: Fluorous Biphase Hydroformylation of Olefins  

Microsoft Academic Search

A novel concept for performing stoichiometric and catalytic chemical transformations has been developed that is based on the limited miscibility of partially or fully fluorinated compounds with nonfluorinated compounds. A fluorous biphase system (FBS) consists of a fluorous phase containing a dissolved reagent or catalyst and another phase, which could be any common organic or nonorganic solvent with limited or

Istvan T. Horvath; Jozsef Rabai

1994-01-01

190

Exploration des effets d’un programme de réadaptation visant l’amélioration des activités et la participation des personnes cérébrolésées. Application à l’activité cuisine.  

E-print Network

??Les troubles cognitifs et comportementaux après une lésion cérébrale peuvent entraîner des limitations d’activité sévères et des restrictions de participation. Les personnes cérébrolésées acquises nécessitent… (more)

Poncet, Frédérique

2014-01-01

191

DES o Digital Encryption Standard  

E-print Network

DES o Digital Encryption Standard o 56-bit secret keys o.S. government o U.S. government non-classified standard (and standard for many other governments?) o small keys (not good enough for state secrets!) o fairly standard secret-key algorithm

Biagioni, Edoardo S.

192

Factorisation des polynômes de Poncelet  

Microsoft Academic Search

La condition pour qu’il existe des n-gones de Poncelet, inscrits dans un cercle, et circonscrits à un autre cercle, est polynomiale\\u000a en les paramètres définissant ces deux cercles. Nous décomposons ces polynômes “de Poncelet” en facteurs irréductibles que\\u000a nous interprétons géométriquement.

Dominique Hulin

2007-01-01

193

Implantation des Espaces de Travail I. Introduction.............................................................. 82  

E-print Network

Chapitre 5 Implantation des Espaces de Travail I. Introduction : Implantation des Espaces de Travail - 82 - I. Introduction L'implantation des Espaces de Travail est basée sur l'utilisation des mécanismes récents des systèmes d'exploitation, comme le Memory-Mapping et le

Donsez, Didier

194

Chiral separation by enantioselective liquid-liquid extraction.  

PubMed

The literature on enantioselective liquid-liquid extraction (ELLE) spans more than half a century of research. Nonetheless, a comprehensive overview has not appeared during the past few decades. Enantioselective liquid-liquid extraction is a technology of interest for a wide range of chemists and chemical engineers in the fields of fine chemicals, pharmaceuticals, agrochemicals, fragrances and foods. In this review the principles and advances of resolution through enantioselective liquid-liquid extraction are discussed, starting with an introduction on the principles of enantioselective liquid-liquid extraction including host-guest chemistry, extraction and phase transfer mechanisms, and multistage liquid-liquid extraction processing. Then the literature on enantioselective liquid-liquid extraction systems is reviewed, structured on extractant classes. The following extractant classes are considered: crown ether based extractants, metal complexes and metalloids, extractants based on tartrates, and a final section with all other types of chiral extractants. PMID:21107491

Schuur, Boelo; Verkuijl, Bastiaan J V; Minnaard, Adriaan J; de Vries, Johannes G; Heeres, Hero J; Feringa, Ben L

2011-01-01

195

Precision liquid level sensor  

DOEpatents

A precision liquid level sensor utilizes a balanced R. F. bridge, each arm including an air dielectric line. Changes in liquid level along one air dielectric line imbalance the bridge and create a voltage which is directly measurable across the bridge. 2 figs.

Field, M.E.; Sullivan, W.H.

1985-01-29

196

Liquid Impact Simulator.  

National Technical Information Service (NTIS)

The liquid impact simulator is capable of shooting single jets of water of diameters varying from .020 inch to .100 inch at speeds up to 3000 feet per second. Minor adaptations of the apparatus could produce even higher velocity jets. These liquid jets ar...

M. P. Scher

1966-01-01

197

Enhancing liquid jet erosion  

Microsoft Academic Search

Process and apparatus for enhancing the erosive intensity of a high velocity liquid jet when the jet is impacted against a surface for cutting, cleaning, drilling or otherwise acting on the surface. A preferred method comprises the steps of forming a high velocity liquid jet, oscillating the velocity of the jet at a preferred Strouhal number, and impinging the pulsed

Johnson V. E. Jr

1984-01-01

198

Liquid Chromatography in 1982.  

ERIC Educational Resources Information Center

Reviews trends in liquid chromatography including apparatus, factors affecting efficient separation of a mixture (peak sharpness and speed), simplified problem-solving, adsorption, bonded phase chromatography, ion selectivity, and size exclusion. The current trend is to control chemical selectivity by the liquid phase. (Author/JN)

Freeman, David H.

1982-01-01

199

Cloud Liquid Water Measurements  

E-print Network

Liquid Water Content? Determines the Potential of Enhancing Precipitation using Cloud Seed TechniquesCloud Liquid Water Measurements By David Delene University of North Dakota #12;Why Measure Cloud (Mali, Saudi Arabia) Basic Cloud Parameter (MPACE) Icing Studies (WISP04, Sikorsky) Comparison

Delene, David J.

200

Advanced proteomic liquid chromatography  

SciTech Connect

Liquid chromatography coupled with mass spectrometry is the predominant platform used to analyze proteomics samples consisting of large numbers of proteins and their proteolytic products (e.g., truncated polypeptides) and spanning a wide range of relative concentrations. This review provides an overview of advanced capillary liquid chromatography techniques and methodologies that greatly improve separation resolving power and proteomics analysis coverage, sensitivity, and throughput.

Xie, Fang; Smith, Richard D.; Shen, Yufeng

2012-10-26

201

Liquid Crystal Thermometers  

NSDL National Science Digital Library

In this activity, learners explore liquid crystal thermometers to observe how heat flows by conduction, convection, radiation, and evaporation. This resource includes five mini-explorations in which learners use basic materials and observe color changes on a liquid crystal thermometer card.

Doherty, Paul

1999-01-01

202

An organocatalytic ionic liquid.  

PubMed

The carbene concentration in 1-ethyl-3-methylimidazolium-acetate ionic liquid is sufficiently high to act as a catalyst in benzoin condensation, hydroacylation and also in oxidation of an alcohol by using CO(2) and air. This observation reveals the potential of ionic liquid organocatalysts, uniting the beneficial properties of these two families of compounds. PMID:21701727

Kelemen, Zsolt; Hollóczki, Oldamur; Nagy, József; Nyulászi, László

2011-08-01

203

Practical animation of liquids  

Microsoft Academic Search

We present a general method for modeling and animating liquids. The system is specifically designed for computer animation and handles viscous liquids as they move in a 3D environment and interact with graphics primitives such as parametric curves and moving polygons. We combine an appropriately modified semi-Lagrangian method with a new approach to calculating fluid flow around objects. This allows

Nick Foster; Ronald Fedkiw

2001-01-01

204

LIGHT NONAQUEOUS PHASE LIQUIDS  

EPA Science Inventory

Nonaqueous phase liquids (NAPLS) are hydrocarbons that exist as a separate, immiscible phase when in contact with water and/or air. ifferences in the physical and chemical properties of water and NAPL result in the formation of a physical interface between the liquids which preve...

205

Natural-gas liquids  

Microsoft Academic Search

Casinghead gasoline or natural gasoline, now more suitably known as natural-gas liquids (NGL), was a nuisance when first found, but was developed into a major and profitable commodity. This part of the petroleum industry began at about the turn of the century, and more than 60 yr later the petroleum industry recovers approx. one million bbl of natural-gas liquids a

W. B. Blackstock; G. W. McCullough; R. C. McCutchan

1968-01-01

206

INEEL Liquid Effluent Inventory  

SciTech Connect

The INEEL contractors and their associated facilities are required to identify all liquid effluent discharges that may impact the environment at the INEEL. This liquid effluent information is then placed in the Liquid Effluent Inventory (LEI) database, which is maintained by the INEEL prime contractor. The purpose of the LEI is to identify and maintain a current listing of all liquid effluent discharge points and to identify which discharges are subject to federal, state, or local permitting or reporting requirements and DOE order requirements. Initial characterization, which represents most of the INEEL liquid effluents, has been performed, and additional characterization may be required in the future to meet regulations. LEI information is made available to persons responsible for or concerned with INEEL compliance with liquid effluent permitting or reporting requirements, such as the National Pollutant Discharge Elimination System, Wastewater Land Application, Storm Water Pollution Prevention, Spill Prevention Control and Countermeasures, and Industrial Wastewater Pretreatment. The State of Idaho Environmental Oversight and Monitoring Program also needs the information for tracking liquid effluent discharges at the INEEL. The information provides a baseline from which future liquid discharges can be identified, characterized, and regulated, if appropriate. The review covered new and removed buildings/structures, buildings/structures which most likely had new, relocated, or removed LEI discharge points, and at least 10% of the remaining discharge points.

Major, C.A.

1997-06-01

207

Sensitive Determination of the Binding of Antidepressants to Synthetic Melanin by Liquid Chromatography After Pre?column Derivatization with Dansyl Chloride  

Microsoft Academic Search

Desipramine (DES), nortriptyline (NOR), amoxapine (AMO), and maprotiline (MAP) are clinically used as antidepressants that contain a secondary amino group and are commercially available. We investigated high performance liquid chromatographic (HPLC) analysis of DES, NOR, AMO, and MAP by derivatization with dansyl chloride (Dns?Cl) in phosphate?buffered saline (PBS). These samples were immediately mixed with Dns?Cl at 50°C for 30 min and

Yasuhiko Higashi; Youichi Fujii

2004-01-01

208

GESTION DES PRESQUE ACCIDENTS ET ACCIDENTS MAJEURS : PREMIER BILAN D'UNE ENQUETE SUR DES SITES SEVESO  

E-print Network

GESTION DES PRESQUE ACCIDENTS ET ACCIDENTS MAJEURS : PREMIER BILAN D'UNE ENQUETE SUR DES SITES sur la gestion des presque accidents. Les presque accidents sont associés à la thématique des précurseurs et des signaux faibles, ces signaux qui sont rendus évident seulement une fois que l'accident est

Boyer, Edmond

209

Une technologie invisible - L'impact des instruments de gestion sur l'évolution des systèmes humains  

Microsoft Academic Search

Des instruments de gestion plus ou moins complexes sont mobilisés dans la gestion des organisations. Ils sont généralement considérés comme des auxiliaires discrets et fidèles au service du pouvoir, comme les indications du tableau de bord et des dispositifs de commande d'un pilote d'avion. Ceci est cohérent avec la vision selon laquelle la conduite des organisations est essentiellement affaire de

Michel Berry

1983-01-01

210

Contribution des éléments de gestion des réclamations à la satisfaction : les apports de la théorie de la justice  

Microsoft Academic Search

La gestion des réclamations revêt une importance toute particulière dans le secteur des services. Cette recherche se propose de présenter les apports des théories de la justice pour la gestion des réclamations dans le cadre d'une expérience de service. Le modèle tétraclasse est mobilisé afin d'étudier la contribution des éléments de justice à la satisfaction. Cette étude montre que, dans

William Sabadie; Isabelle Prim-Allaz; Sylvie Llosa

2006-01-01

211

Tunable liquid crystal lasers  

NASA Astrophysics Data System (ADS)

Liquid crystal lasers are dye-doped distributed feedback lasing systems. Fabricated by coupling the periodic structure of a liquid crystal medium with a fluorescent dye, the emission from these systems is tunable by controlling the liquid crystal system---be it through electric or thermal field effects, photochemical reactions, mechanical deformations, etc. The laser action arises from an extended interaction time between the radiation field, the laser emission, and the matter field, the periodic liquid crystal medium, at the edge of the photonic band gap. In this thesis, several tunable liquid crystal laser systems are investigated: cholesteric liquid crystals, holographic-polymer dispersed liquid crystals and liquid crystal polarization gratings. The primary focus has been to fabricate systems that are tunable through electrical means, as applications requiring mechanical or thermal changes are often difficult to control. Cholesteric liquid crystal lasers are helical Bragg reflectors, with a band gap for circularly polarized light of equivalent handedness to their helix. These materials were doped with a laser dye and laser emission was observed. The use of an in-plane electric field tends to unwind the helical pitch of the film and in doing so tunable emission was demonstrated for ˜15 nm. Holographic-polymer dispersed liquid crystals (H-PDLCs) are grating structures consisting of alternating layers of polymer and liquid crystal, with different indices of refraction. The application of an electric field index matches these layers and switches off the grating. Thus, laser emission can be switched on and off through the use of an electric field. Spatially tunable H-PDLC lasers were fabricated by creating chirped gratings, formed by divergent beams. The emission was shown to tune ˜5 nm as the pump beam was translated across a 1 inch film. Liquid crystal polarization gratings use photo-patterned alignment layers, through a polarization holography exposure, to induce an alignment in a liquid crystal film. Electrically tunable emission was demonstrated in these systems. Applications of liquid crystal lasers include emissive substrates or backplanes for displays or tunable emission sources for biology and medicine. The potential for such applications are discussed.

Woltman, Scott J.

212

Polymers and Liquid Crystals  

NSDL National Science Digital Library

This newly enhanced site is the result of a cooperative effort between the Department of Physics and the Department of Macromolecular Science and Engineering at Case Western Reserve University in conjunction with the Center for Advanced Liquid Crystalline Optical Materials (ALCOM) at Kent State University. The project aims to demonstrate the potential of the hypertext multimedia medium for instructional use, and is still under development (occasionally users will come across an "under construction" notice). Topics covered include polymers, liquid crystals, polymer liquid crystals, polymer dispersed liquid crystals, polymer stabilized cholesterics, and liquid crystal displays. The previous version, which debuted in January 1996, has been enhanced with more video and audio, frames, and a glossary. Throughout the text, users are invited to enter the Virtual Laboratory, in which browser applets allow control of experiments demonstrating the principles under discussion. A CD-ROM version of the textbook is planned.

1996-01-01

213

Les cristaux considrs comme des graphes ou des 2-complexes ; le cas des cristaux apriodiques  

E-print Network

de donner une image simple de la topologie de la « surface atomique » d'un cristal apériodique (quasi-cristal) : nous montrons en effet que cette topologie est équivalente à la topologie des chemins sur un cristal

Boyer, Edmond

214

Die Unabhängigkeit des morphologischen Farbwechsels vom physiologischen Farbwechsel bei der Entstehung des Hochzeitskleides des männlichen Bitterlings  

Microsoft Academic Search

Die Zahl der Erythrophoren beim männlichen Bitterling läßt sich durch Hodenextrakte, Hypophysenvorderlappen- und Hypophysenhinterlappenextrakte vermehren und durch Adrenalin vermindern, in allen Fällen ohne Veränderung ihres Expansionsgrades. Diese Befunde zeigen, daß der morphologische Farbwechsel direkt durch Hormone bedingt ist und nicht eine Folge des physiologischen ist.

Gertraut Brantker

1956-01-01

215

Aimant PS: controle de l'etat des sertissages internes des PFW mesures effectues surl'ensemble des aimants du PS pendant le grand arret 2004/2006  

E-print Network

Les sertissages (douilles), utilisés pour raccorder les méplats du circuit principal des PFW à leurs câbles d’alimentation, présentent parfois des défauts de réalisation qui entraînent une résistance électrique anormale. Pour mettre en évidence ces défauts, la résistance des 4 sertissages des nappes polaires est mesurée. Les nappes sont alimentées avec un courant efficace nominal de 80A.Les mesures sont effectuées entre le bornier de connexions des 4 câbles d’alimentation des PFW et les circuits auxiliaires correspondants (Pick-ups brasés sur les enroulements). De ces mesures (câble d’alimentation et une courte partie du circuit principal) est déduite la valeur de la résistance du sertissage qui en assure la liaison. A la mesure des résistances des sertissages des nappes polaires supérieures s’ajoute la résistance des câbles qui assurent la liaison entre borniers. Dans le cadre de la rénovation des aimants du PS, les 100 unités on été mesurées.

Ottaviani, J

2005-01-01

216

Analyse des relations entre plasticité architecturale des buissons et prolifération de leurs populations.  

E-print Network

??L'étude qualitative et quantitative du mode de développement des plantes envahissantes est actuellement considérée comme une étape clef dans la compréhension des phénomènes d'invasion. L'objectif… (more)

Charles-Dominique, Tristan

2011-01-01

217

Analyse des relations entre plasticité architecturale des buissons et prolifération de leurs populations.  

E-print Network

??L’étude qualitative et quantitative du mode de développement des plantes envahissantes est actuellement considérée comme une étape clef dans la compréhension des phénomènes d’invasion. L’objectif… (more)

Charles-Dominique, Tristan

2011-01-01

218

lments pour une histoire des politiques publiques en faveur des "musiques amplifies"  

E-print Network

domaine des "musiques amplifiées"1 (rock, rap, techno, etc.), la multiplication des lieux musicaux la politique culturelle3 tournant le dos à ses objectifs initiaux et faisant le lit de la barbarie.4

Paris-Sud XI, Université de

219

Photonique des Morphos  

NASA Astrophysics Data System (ADS)

Part I. DM in Cosmology: 1. Particle dark matter G. Bertone and J. Silk; 2. Simulations of CDM haloes B. Moore and J. Diemand; 3. MW substructures J. Bullock, M. Kaplinghat and L. Strigari; 4. Gravitational lensing and dark matter Y. Mellier; 5. Dark matter at the centers of galaxies D. Merritt; 6. Modified gravity as an alternative to DM J. Bekenstein; Part II. Candidates: 7. DM production mechanisms G. Gelmini and P. Gondolo; 8. Supersymmetric DM candidates J. Ellis and K. Olive; 9. DM at the EW scale: non-SUSY candidates G. Servant; 10. Non-WIMP candidates J. L. Feng; 11. Axions P. Sikivie; 12. Sterile neutrinos M. Shaposhnikov; Part III. Colliders Searches: 13. SUSY searches at the LHC T. Plehn and G. Polesello; 14. SUSY DM at colliders M. Battaglia and M. E. Peskin; 15. Extra dimensions at the LHC K. Kong, K. Matchev and G. Servant; 16. SUSY tools F. Boudjema, J. Edsjö and P. Gondolo; Part IV. Direct Detection: 17. Direct detection of WIMPs D. G. Cerdeño and A. Green; 18. Annual modulation with NaI(Tl) R. Bernabei and P. Belli; 19. Particle DM and DAMA N. Fornengo; 20. Cryogenic detectors G. Gerbier and J. Gascon; 21. Liquid noble gases E. Aprile and L. Baudis; 22. Directional detectors N. Spooner; 23. Axion searches S. Asztalos; Part V. Indirect Detection and Astrophysical Constraints: 24. Gamma-rays L. Bergström and G. Bertone; 25. Neutrinos F. Halzen and D. Hooper; 26. Antimatter P. Salati, F. Donato and N. Fornengo; 27. Multi-wavelength S. Profumo and P. Ullio; 28. Dark matter and BBN K. Jedamzik and M. Pospelov; 29. Dark matter and stars G. Bertone; Appendix; References; Index.

Bertone, Gianfranco

2010-01-01

220

Partager : des technologies de pointe au service de la société  

SciTech Connect

Médecine, climatologie, métrologie et informatique, les techniques utilisées par le LHC trouvent déjà des répercussions dans d’autres domaines scientifiques. Utilisant des techniques inédites, la physique des particules en fait bénéficier la société toute entière.

None

2011-02-14

221

Plan de cours Facult des arts et des sciences  

E-print Network

, Klaus et al. Protistology. 3e éd. 379 p. 2003. Kudo, R.R. 1971. Protozoology. 5e éd. Thomas Book. Lee, J.J. éd. 1985. The Illustrated Guide to the Protozoa. Society of protozoologists. Lee, J.J. et al. éd Reviers, B. de. 2002. Biologie et phylogénie des algues. Tome 1 et 2. Belin, Paris Sze, P. 1998. A b

Parrott, Lael

222

Facult des arts et des sciences Dpartement de sociologie  

E-print Network

'inférence statistique, test chi-carré, test t, ANOVA, corrélation et régression. Initiation au logiciel d'analyse statistique SPSS et utilisation du tableur Excel. OBJECTIFS D'APPRENTISSAGE Le présent cours vise à initier) Effectuer ces analyses usuelles à l'aide des logiciels Excel et SPSS; 5) Savoir émettre une critique

Parrott, Lael

223

FACULT DES ARTS ET DES SCIENCES DPARTEMENT DE COMMUNICATION  

E-print Network

-2578 Courrier électronique : carole.groleau@umontreal.ca Coordonnateur des stages : Frédéric Truax Bureau B-415 Téléphone : (514) 343-6111 poste 2763 Télécopieur : (514) 400-2578 Courrier électronique : frederic communication et politique Courrier électronique : odette.langlois@umontreal.ca Téléphone : (514) 343-6111 poste

Parrott, Lael

224

FACULT DES ARTS ET DES SCIENCES DPARTEMENT DE COMMUNICATION  

E-print Network

-2578 Courrier électronique : carole.groleau@umontreal.ca Coordonnateur des stages : Frédéric Truax Bureau B-415 Téléphone : (514) 343-6111 poste 2763 Télécopieur : (514) 400-2578 Courrier électronique : frederic (temporaire) Bureau : B-428 Courrier électronique : amelie.hudon@umontreal.ca Téléphone : (514) 343-6111 poste

Parrott, Lael

225

Facult des arts et des sciences Dpartement de science politique  

E-print Network

� l'analyse politique, en amenant ceux-ci � analyser un conflit de leur choix, � partir des concepts'analyse politique (50%). Le travail d'analyse porte sur un conflit politique s'�tant d�roul� en 2013 ou au d�but de-32). 14 janvier L'analyse politique d'un conflit � No�l et Th�rien, avant-propos, introduction et chapitre

Parrott, Lael

226

TUDE DES PROPRITS PHYSIQUES DES COUCHES MINCES PHOTOSENSIBLES DE SULFURE DE CADMIUM  

E-print Network

757 �TUDE DES PROPRI�T�S PHYSIQUES DES COUCHES MINCES PHOTOSENSIBLES DE SULFURE DE CADMIUM Par G. - Pour reconnaître si les cellules au sulfure de cadmium étaient aptes à la photométrie des petits flux substances photo- conductrices, le sulfure de cadmium est l'une des plus sensibles. On entend par là d

Paris-Sud XI, Université de

227

La culture en action des enseignants LA CULTURE EN ACTION DES ENSEIGNANTS  

E-print Network

La culture en action des enseignants 1 LA CULTURE EN ACTION DES ENSEIGNANTS REVUE DES SCIENCES DE L'action située, cet article propose une analyse de la cognition et de la culture en action des enseignants. La en classe et la possibilité d'une culture partagée ; la troisième sur les processus de transmission

Paris-Sud XI, Université de

228

Electroactive liquid lens driven by an annular membrane.  

PubMed

Unlike traditional focalization that recruits multiple moving lens elements to adjust focus, liquid lenses deliver adaptive focusing by simply tuning the surface profile of liquid or the elastomer that encloses liquid. Its simple and compact configuration, low cost, and actuation efficiency promise wide industrial, medical, and consumer applications. Dielectric elastomers (DEs), one type of commercially available soft active material, have been a good fit for creating adaptive optics. In this Letter, we present an adaptive, membrane-sealed liquid lens hydrostatically coupled to a concentric annular DE actuator. Electric actuation deforms the annular DE, which induces fluid transmission between the lens part and the actuation part for lens actuation. The maximum measured focal range was from 25.4 to 105.2 mm within 1.0 kV, which significantly outperforms the existing DE-actuated liquid lenses and eliminates the need for prestraining. The lens also enables varied focal ranges by simply adjusting its initial surface sagitta, providing flexibility for practical imaging applications. PMID:24690736

Wei, Kang; Domicone, Nicholas Wade; Zhao, Yi

2014-03-01

229

Liquid sampling system  

DOEpatents

A conduit extends from a reservoir through a sampling station and back to the reservoir in a closed loop. A jet ejector in the conduit establishes suction for withdrawing liquid from the reservoir. The conduit has a self-healing septum therein upstream of the jet ejector for receiving one end of a double-ended cannula, the other end of which is received in a serum bottle for sample collection. Gas is introduced into the conduit at a gas bleed between the sample collection bottle and the reservoir. The jet ejector evacuates gas from the conduit and the bottle and aspirates a column of liquid from the reservoir at a high rate. When the withdrawn liquid reaches the jet ejector the rate of flow therethrough reduces substantially and the gas bleed increases the pressure in the conduit for driving liquid into the sample bottle, the gas bleed forming a column of gas behind the withdrawn liquid column and interrupting the withdrawal of liquid from the reservoir. In the case of hazardous and toxic liquids, the sample bottle and the jet ejector may be isolated from the reservoir and may be further isolated from a control station containing remote manipulation means for the sample bottle and control valves for the jet ejector and gas bleed. 5 figs.

Larson, L.L.

1984-09-17

230

Liquid sampling system  

DOEpatents

A conduit extends from a reservoir through a sampling station and back to the reservoir in a closed loop. A jet ejector in the conduit establishes suction for withdrawing liquid from the reservoir. The conduit has a self-healing septum therein upstream of the jet ejector for receiving one end of a double-ended cannula, the other end of which is received in a serum bottle for sample collection. Gas is introduced into the conduit at a gas bleed between the sample collection bottle and the reservoir. The jet ejector evacuates gas from the conduit and the bottle and aspirates a column of liquid from the reservoir at a high rate. When the withdrawn liquid reaches the jet ejector the rate of flow therethrough reduces substantially and the gas bleed increases the pressure in the conduit for driving liquid into the sample bottle, the gas bleed forming a column of gas behind the withdrawn liquid column and interrupting the withdrawal of liquid from the reservoir. In the case of hazardous and toxic liquids, the sample bottle and the jet ejector may be isolated from the reservoir and may be further isolated from a control station containing remote manipulation means for the sample bottle and control valves for the jet ejector and gas bleed.

Larson, Loren L. (Idaho Falls, ID)

1987-01-01

231

Nanowire liquid pumps.  

PubMed

The ability to form tiny droplets of liquids and control their movements is important in printing or patterning, chemical reactions and biological assays. So far, such nanofluidic capabilities have principally used components such as channels, nozzles or tubes, where a solid encloses the transported liquid. Here, we show that liquids can flow along the outer surface of solid nanowires at a scale of attolitres per second and the process can be directly imaged with in situ transmission electron microscopy. Microscopy videos show that an ionic liquid can be pumped along tin dioxide, silicon or zinc oxide nanowires as a thin precursor film or as beads riding on the precursor film. Theoretical analysis suggests there is a critical film thickness of ?10 nm below which the liquid flows as a flat film and above which it flows as discrete beads. This critical thickness is the result of intermolecular forces between solid and liquid, which compete with liquid surface energy and Rayleigh-Plateau instability. PMID:23542904

Huang, Jian Yu; Lo, Yu-Chieh; Niu, Jun Jie; Kushima, Akihiro; Qian, Xiaofeng; Zhong, Li; Mao, Scott X; Li, Ju

2013-04-01

232

Liquid crystalline conducting polymers  

SciTech Connect

Recently we developed side chain liquid crystalline polyacetylene derivatives and achieved a substantial enhancement of electrical conductivity through magnetically forced alignment of the side chain of the polymer. When an electric field is employed as an alternative external force instead of the magnetic force, a ferroelectric liquid crystal should the more favorable than usual liquid crystals. This is because the former can respond more smoothly to the electric field owing to its spontaneous polarization than the latter. Here, in order to develop a novel liquid crystalline conducting polymer, we have synthesized a chiroptical liquid crystalline polyacetylene derivative. The liquid crystalline side chain of the polymer consists of a chiral alkyl moiety as a terminal group and a biphenyl moiety as a mesogenic core and a trimethylene segment as a spacer. The polymerization was carried out using a metathesis catalyst of MoCl{sub 5}-SnPh{sub 4}. Both the monomer and polymer showed the same signs in CD (circular dichroism) bands, indicating that the chirality of the monomer is maintained in the polymer. Measurements of DSC (differential scanning calorimeter) and polarizing microscope indicated that the polymer has a chiral smectic C (S{sub m} C*) phase assignable to the ferroelectric liquid crystal. Electrical and chemical properties of the polymer, including dielectric constant, electrical conductivity upon iodine doping and morphological alignment under an external force, are to be presented.

Akagi, K.; Goto, H.; Shirakawa, H. [Univ. of Tsukuba, Ibaraki (Japan)

1996-10-01

233

Liberalisierung des internationalen Dienstleistungshandels: Analyse des GATS und Perspektiven für die zukünftige Handelsliberalisierung  

Microsoft Academic Search

Die vorliegende Untersuchung stellt die Probleme des internationalen Dienstleistungshandels dar; sie analysiert und bewertet die derzeit gültigen Regelungen des GATS. Sowohl die konzeptionelle Problematik der Definition von Dienstleistungen und Dienstleistungshandel, als auch die sich aus der Struktur des GATS heraus ergebenden Probleme für eine weiterführende, erfolgreiche Handelsliberalisierung werden untersucht. Darauf aufbauend werden verschiedene Optionen für die Konzeption zukünftiger Liberalisierungsverhandlungen diskutiert.

Jan Krancke

1999-01-01

234

De l'Utilisation des VPNs pour l'Administration et la Scurit des Services Web  

E-print Network

VPNs (et les protocoles de sécurité associés tels IPsec et SSL) dans une architecture des services web basée sur des tunnels IPsec entre des sites distri- bués sur l'Internet, ces sites pouvant être un

Castelluccia, Claude

235

De l'Utilisation des VPNs pour l'Administration et la Scurit des Services Web  

E-print Network

VPNs (et les protocoles de sécurité associés tels IPsec et SSL) dans une architecture des services web basée sur des tunnels IPsec entre des sites distri­ bués sur l'Internet, ces sites pouvant être un

Castelluccia, Claude

236

Electronique organique: Emission de lumire bleue dans des OLEDs via des excimres intramolculaires.  

E-print Network

Electronique organique: Emission de lumi�re bleue dans des OLEDs via des excim�res intramol ces nouvelles mol�cules comme couche active dans des diodes organiques �lectroluminescentes (OLEDs OLEDs. Ces travaux s'int�grent dans la th�matique "Compos�s 3-2spiro pour l'�lectronique organique

Rennes, Université de

237

Caractrisation hydrodynamique des sols : analyse simplifie des essais de drainage interne  

E-print Network

Caractérisation hydrodynamique des sols : analyse simplifiée des essais de drainage interne Michel-Martin-d'Hères R�SUM� On présente une méthode simple d'analyse des essais de drainage interne classiquement utilisés au Determination of soil hydraulic properties : simplified analysis of internal drainage experiments. A simple

Boyer, Edmond

238

LA GESTION DES RESULTATS LORS DES INTRODUCTIONS EN BOURSE EST ELLE  

E-print Network

1 LA GESTION DES RESULTATS LORS DES INTRODUCTIONS EN BOURSE EST ELLE INFORMATIVE ? Auteur résultats et la performance boursière à long terme des introductions en bourse dans un pays européen notamment la France. Nous examinons les `accruals' discrétionnaires avant et après l'introduction en bourse

Boyer, Edmond

239

Rsum du projet de Thse "Utilisation des eaux uses en irrigation : survie des pathognes"  

E-print Network

Résumé du projet de Thèse "Utilisation des eaux usées en irrigation : survie des pathogènes éclairer les décisions publiques en matières de réglementations (traitements des eaux, irrigations, modes

Naud Frédéric

240

Activit parasitaire des Trichoderma vis--vis des champignons sclrotes ; corrlation avec  

E-print Network

Activité parasitaire des Trichoderma vis-à-vis des champignons à sclérotes ; corrélation avec l Montpellier Cedex R�SUM�� Une vingtaine de clones de Trichoderma, comparés pour leur aptitude à détruire des saprophytique. SUMMARYY Parasitic activity of Trichoderma clones against sclerotial fungi ; correlation

Paris-Sud XI, Université de

241

Etude des Seuils de Poursuite et de Dmodulation des Signaux Galileo pour  

E-print Network

Etude des Seuils de Poursuite et de Démodulation des Signaux Galileo pour l'Aviation Civile Lieu'utilisation de Galileo par l'aviation civile. D'autre part, dans le cadre de discussions bilatérales entre les signaux GPS et Galileo, et, en particulier, afin de s'assurer que la co-existence des signaux GPS et

Dobigeon, Nicolas

242

Modélisation conjointe des données et des processus pour l’implantation de schémas d’entrepôts  

Microsoft Academic Search

Au cours de ces dernières années, plusieurs approches ont abordé la modélisation et le développement des Entrepôts de Données (ED). La plupart de ces approches fournit des solutions partielles qui traitent soit la modélisation multidimensionnelle, soit la modélisation des processus d’Extraction-Transformation-Chargement. Toutefois, peu de travaux ont visé à unifier ces deux problématiques dans un cadre structuré ou à automatiser le

Faten Atigui; Franck Ravat; Olivier Teste; Gilles Zurfluh

2012-01-01

243

Liquid metal drop ejection  

NASA Technical Reports Server (NTRS)

The aim of this project was to demonstrate the possibility of ejecting liquid metals using drop on demand printing technology. The plan was to make transducers for operation in the 100 MHz frequency range and to use these transducers to demonstrate the ability to eject drops of liquid metals such as gallium. Two transducers were made by indium bonding piezoelectric lithium niobate to quartz buffer rods. The lithium niobate plates were thinned by mechanical polishing to a thickness of 37 microns for operation at 100 MHz. Hemispherical lenses were polished in the opposite ends of the buffer rods. The lenses, which focus the sound waves in the liquid metal, had an F-number equals 1. A mechanical housing was made to hold the transducers and to allow precise control over the liquid level above the lens. We started by demonstrating the ability to eject drops of water on demand. The drops of water had a diameter of 15 microns which corresponds to the wavelength of the sound wave in the water. A videotape of this ejection was made. We then used a mixture of Gallium and Indium (used to lower the melting temperature of the Gallium) to demonstrate the ejection of liquid metal drops. This proved to be difficult because of the oxide skin which forms on the surface of the liquid. In some instances, we were able to eject metal drops, however, this was not consistent and reproducible. An experiment was set up at NASA-Lewis to stabilize the process of drop on demand liquid metal ejection. The object was to place the transducer and liquid metal in a vacuum station so that no oxide would form on the surface. We were successful in demonstrating that liquid metals could be ejected on demand and that this technology could be used for making sheet metal in space.

Khuri-Yakub, B. T.

1993-01-01

244

Rsum des travaux ric Colin de Verdire  

E-print Network

topologique. En termes de communau- tés, mon principal domaine est celui de la géométrie et de la topologie courbes, utilisant des notions de topologie algébrique. Dans le domaine de l'optimisation combinatoire, j cadre homologique, en utili- sant des outils avancés de topologie algébrique, avec des conséquences en

Gutkin, Boris

245

Evaluation de la complexité des filtres numériques  

Microsoft Academic Search

\\u000a Analyse  En filtrage numérique, il est important de pouvoir évaluer la complexité des calculs à mettre en œuvre pour réaliser une fonction\\u000a à partir des spécifications du système. Des expressions simplifiées sont données dans le présent article pour les principales\\u000a techniques de filtrage, les filtres à réponse impulsionnelle finie, les filtres à réponse impulsionnelle infinie, les filtres\\u000a de type multicadence. Les

Maurice Bellanger

1982-01-01

246

Imagerie des azoospermies d’origine excrétoire  

Microsoft Academic Search

Resume  L’hypofertilité d’origine excrétoire représente de 10 à 15% des azoospermies ou des oligozoospermies sévères (<1 million de\\u000a spermatozoïdes\\/ml) à FSH normale. Les azoospermies avec normospermie sont liées à un obstacle proximal. L’ échographie du\\u000a contenu scrotal peut mettre en évidence, quand l’examen clinique n’est pas concluant, une augmentation de volume des épididymes\\u000a qui ont un aspect hypoéchogène ou une dilatation

F. Cornud; X. Belin; D. Delafontaine; T. Amar; O. Hélénon; J. F Moreau

1996-01-01

247

Projet EPINES: production, distribution et analyse des  

E-print Network

, plusieurs modèles (3 pour l'IPSL) ­ Environ 900 variables de sorties, avec des fréquences de sorties de tri'un gros volume le plus rapidement possible �critures avec des outils et des formats « standards d'un message => MPI_Iprobe. Réception : MPI_Irecv / MPI_Test. On reçoit en priorité les messages

Canet, Léonie

248

Solids, Liquids, and Gases  

NSDL National Science Digital Library

In this project you will research solids, liquids, and gases. By the end of this project you will be able to answer the question: Can you tell what is alike and different between solids, liquids, and gases? Read the song about matter. song with music about matter Record your observations on the organizer provided by the teacher. On the diagram write the word solid in one of the circles. Write liquid in one of the circles and write gas in the last circle. As you collect your information write your information under ...

Sibley, Ms.

2009-10-22

249

Liquid-level detector  

DOEpatents

Aliquid level sensor is described which has a pair of upright conductors spaced by an insulator defining a first high resistance path between the conductors. An electrically conductive path is interposed between the upright conductors at a discrete location at which liquid level is to be measured. It includes a liquid accessible gap of a dimension such that the electrical resistance across the conductor when the gap is filled with the liquid is detectably less than when the gap is emptied. The conductor might also be physically altered by temperature changes to serve also as an indicator of elevated temperature.

Not Available

1981-01-29

250

Liquid propellant rockets.  

NASA Technical Reports Server (NTRS)

A brief overview of the state of knowledge in liquid rocket technology is presented and examples are provided of instances where some fundamental principles of chemistry, fluid mechanics, and mathematics can be applied. A liquid propellant rocket classification is discussed together with rocket system performance, applications for liquid propellants, the effective exhaust velocity, aspects of simplified nozzle expansion, questions about theoretical propellant performance, the effect of chamber pressure on equilibrium performance, and the kinetic recombination in nozzles. Details of propellant combustion are examined, giving attention to propellant injection, evaporation-controlled combustion, combustion instability, and monopropellant decomposition.

Dipprey, D. F.

1972-01-01

251

Liquid metal electric pump  

DOEpatents

An electrical pump for pumping liquid metals to high pressures in high temperature environments without the use of magnets or moving mechanical parts. The pump employs a non-porous solid electrolyte membrane, typically ceramic, specific to the liquid metal to be pumped. A DC voltage is applied across the thickness of the membrane causing ions to form and enter the membrane on the electrically positive surface, with the ions being neutralized on the opposite surface. This action provides pumping of the liquid metal from one side of the non-porous solid electrolyte membrane to the other.

Abbin, Joseph P. (Albuquerque, NM); Andraka, Charles E. (Albuquerque, NM); Lukens, Laurance L. (Albuquerque, NM); Moreno, James B. (Albuquerque, NM)

1992-01-01

252

Extremely Correlated Fermi Liquids  

E-print Network

We present the theory of an extremely correlated Fermi liquid (ECFL) with $U\\to \\infty$. This liquid has an underlying Fermi liquid (FL) Greens function that is further caparisoned. The theory leads to two parallel hierarchies of equations that permit iterative approximations in a certain parameter. Preliminary results for the spectral functions display a broad background and a distinct $T$ dependent left skew. An important energy scale $\\Delta(\\vec{k},x)$ emerges as the average inelasticity of the FL Greens function, and influences the photoemission spectra profoundly. A duality is identified wherein an apparent loss of coherence of the ECFL results from an excessively sharp FL.

B. Sriram Shastry

2011-02-14

253

Electrically Deformable Liquid Marbles  

E-print Network

Liquid marbles, which are droplets coated with a hydrophobic powder, were exposed to a uniform electric field. It was established that a threshold value of the electric field, 15 cgse, should be surmounted for deformation of liquid marbles. The shape of the marbles was described as a prolate spheroid. The semi-quantitative theory describing deformation of liquid marbles in a uniform electric field is presented. The scaling law relating the radius of the contact area of the marble to the applied electric field shows a satisfactory agreement with the experimental data.

Edward Bormashenko; Roman Pogreb; Tamir Stein; Gene Whyman; Marcelo Schiffer; Doron Aurbach

2011-02-17

254

Publi dans Kirat T. et Torre A. (2008), "Les territoires des conflits : origines, formes et volutions des conflits d'usage des territoires", Paris, L'Harmattan.  

E-print Network

Publié dans Kirat T. et Torre A. (2008), "Les territoires des conflits : origines, formes et évolutions des conflits d'usage des territoires", Paris, L'Harmattan. 1 DROIT DE PROPRIETE ET GESTION DES CONFLITS AGRICULTURE - ENVIRONNEMENT François Facchini INTRODUCTION La nouvelle Politique Agricole Commune

Paris-Sud XI, Université de

255

Duftmarketing – Eine spezielle Form des Neuromarketings.  

E-print Network

??Duftmarketing ist als Teil des Neuromarketings eine junge wissenschaftliche Disziplin. Durch den Einsatz von Duftmarketing sollen Kauf- und Wahlentscheidungen im menschlichen Gehirn zum Zwecke der… (more)

Bartzos, Franziska

2008-01-01

256

PROPRITS DES PROTINES B. GODON L. PETIT  

E-print Network

V. - PROPRI�T�S DES PROT�INES B. GODON L. PETIT Alice de PASTORS, �léonore HUDZIK Jeanine OOGHE de Biochimie et Physicochimie des Céréales, I. N. R. A., C. B. R. D. I. A, 91 - Massy R�SUM� L'étude de l'évolution des protéines au cours des traitements de préstockage et de séchage a été entreprise

Boyer, Edmond

257

Zusammensetzung und Nährwert des Krebsfleisches von Astacus leptodactylus  

Microsoft Academic Search

Zusammenfassung Es wurde die chemische Zusammensetzung des Krebsfleisches des SumpfkrebsesAstacus leptodactylus Esch, getrennt für Männchen und Weibchen, untersucht und das Verhältnis von Längenklasse und Fleischausbeute festgestellt.

Teofil Dabrowski; Edward Ko?akowski; Eugeniusz Soko?owski

1966-01-01

258

Über die Wirkung des Strophanthins auf das Zentralnervensystem  

Microsoft Academic Search

Zusammenfassung Strophanthin übt bei der Injektion in den Hirnventrikel des nichtnarkotisierten Tieres eine intensive Reizwirkung aus, die besonders durch eine starke Beeinflussung des Herznervensystems gekennzeichnet ist.

C. Korth; H. Marx; S. Weinberg

1937-01-01

259

Stoffwechselwirkung des Strophanthins am Warmblüterherzen  

Microsoft Academic Search

Zusammenfassung Untersuchungen über das Verhalten der Tätigkeitssubstanzen im freischlagenden Warmblüterherzen nach Zusatz wirksamer Strophanthingaben ergeben:1.Konstanz sämtlicher Phosphorsäurefraktionen im optimal tätigen Herzen nach therapeutischen Strophanthingaben.2.Zerfall des Phosphagens, der Adenylpyrophosphorsäure und der freien Adenylsäure in der toxischen Strophanthinkontraktur.3.Die mit der leistungssteigernden Strophanthinwirkung am insuffizienten Herzen, bei dem die Tätigkeitssubstanzen zunehmend zerfallen, aerob erfolgende Resynthese der Tätigkeitssubstanzen betrifft in erster Linie das Phosphagen,

Bruno Weicker

1935-01-01

260

DIVISION INFORMATIQUE Facult des lettres  

E-print Network

courrier électronique est un canal de communication officiel, qui est utilisé pour les inscriptions en://redirection.unige.ch/ · testez à l'avance le fonctionnement de votre courrier électronique UniGe ! #12;DIVISION INFORMATIQUE 19 première inscription IEL en Faculté des lettres doit être formulé officiellement par courrier , manuscrit

Halazonetis, Thanos

261

Date limite dpt des dossiers  

E-print Network

. LEBEURRE KOENIG) 20 juin 2014 17 juillet 2014 M2 Droit de la Banque (Mme DOUCHY-OUDOT - Mme ROMANI) 20 juin 2014 M2 Droit et Gestion des Personnes du SSS (M. PEDROT - Mme DORVAUX) 20 juin 2014 17 juillet 2014 M1 Fondamentaux (M. DI MANNO - Mme SEVERINO) 23 juin 2014 17 juillet 2014 M1 Carrières Publiques (Mme BAUDREZ

Chamroukhi, Faicel

262

ISSN18310850 COUR DES COMPTES  

E-print Network

-cadre de recherche? 5 7e PC: le septième programme-cadre pour des actions de recherche, de développement UNE MISE EN OEUVRE EFFICIENTE DU SEPTI�ME PROGRAMME-CADRE DE RECHERCHE? #12;#12;LA COMMISSION A-T-ELLE ASSUR� UNE MISE EN OEUVRE EFFICIENTE DU SEPTI�ME PROGRAMME-CADRE DE RECHERCHE? Rapport spécial n° 2 2013

Pouyanne, Nicolas

263

Programmation python Utilisation des listes  

E-print Network

TD 3 - Programmation python Utilisation des listes Informatique MPSI1 - Lyc´ee Thiers 2013/2014 #12 : Chiffrement de C´esar Enonc´e Solution Informatique MPSI1 - Lyc´ee Thiers TD 3 - Programmation python'ex´ecution est du m^eme ordre de grandeur. Informatique MPSI1 - Lyc´ee Thiers TD 3 - Programmation python

Préaux, Jean-Philippe

264

Phase Inversion in a Batch Liquid - Liquid Stirred System  

Microsoft Academic Search

Phase inversion phenomenon occurs in many industrial processes including liquid- liquid dispersions. Some parameters such as energy input or the presence of mineral compounds in the system affect this phenomenon. The aim of this research is to study the speed of rotation or energy input at a range of 400 to 800 rpm in a batch liquid-liquid system containing toluene

M. Amouei; P. Khadiv-Parsi; M. M. Moosavian; N. Hedayat; A. A. Davoodi

265

Liquidity facilities and signaling  

E-print Network

This dissertation studies the role of signaling concerns in discouraging access to liquidity facilities like the IMF contingent credit lines (CCL) and the Discount Window (DW). In Chapter 1, I analyze the introduction of ...

Arregui, Nicolás

2010-01-01

266

Rock drilling, cooling liquids  

NSF Publications Database

Title : Rock drilling, cooling liquids Type : Antarctic EAM NSF Org: OD / OPP Date : October 23 ... antifreeze agents at Linneaus Terrace, Wright Valley (Site of Special Scientific Interest No. 19 ...

267

Liquid sample processor  

NASA Technical Reports Server (NTRS)

Processor is automatic and includes series of extraction tubes packed with fibrous absorbent material of large surface area. When introduced into these tubes, liquid test samples become completely absorbed by packing material as thin film.

Jahnsen, V. J.; Campen, C. F., Jr.

1975-01-01

268

Liquid Crystal IR Detector  

NSDL National Science Digital Library

This is a student activity on the detection of a warm object with a liquid crystal sheet. This activity also can be a simulation of the detection of infrared radiation. The "For Further Research" section includes questions for the student.

2012-10-30

269

Liquid Assets: Wastewater  

NSDL National Science Digital Library

This video segment from a WPSU documentary Liquid Assets describes the progression of wastewater management from its early days to present day wastewater treatment systems. The development of Boston’s first-ever waste management system is described.

Wpsu

2008-11-20

270

Liquid rocket engine injectors  

NASA Technical Reports Server (NTRS)

The injector in a liquid rocket engine atomizes and mixes the fuel with the oxidizer to produce efficient and stable combustion that will provide the required thrust without endangering hardware durability. Injectors usually take the form of a perforated disk at the head of the rocket engine combustion chamber, and have varied from a few inches to more than a yard in diameter. This monograph treats specifically bipropellant injectors, emphasis being placed on the liquid/liquid and liquid/gas injectors that have been developed for and used in flight-proven engines. The information provided has limited application to monopropellant injectors and gas/gas propellant systems. Critical problems that may arise during injector development and the approaches that lead to successful design are discussed.

Gill, G. S.; Nurick, W. H.

1976-01-01

271

Liquid Assets: Public Health  

NSDL National Science Digital Library

This video segment from a WPSU documentary Liquid Assets connects public health to the availability of clean and safe drinking water and elaborates on the threats our bodies face due to increasing kinds and quantities of pollutants.

Wpsu

2008-11-19

272

Liquid Crystal Sensor  

NSDL National Science Digital Library

This is a classroom activity to explain liquid crystal sensors for middle school students. A list of activity materials and .pdf handouts are included. Objectives: -Understand how liquid crystals (LCs) relate to other phases of matter (liquid, solid, gas) -Observe that liquid crystals reflect many different colors (wavelengths) of light -Learn that thermally sensitive LCs twist and turn (change pitch & orientation) at different temperatures, which changes the particular color of light that they reflect -Learn that just like some LCs can measure temperature, others can 'sense' particular chemicals and biological agents -Explore how LC sensors can be used to detect changes that cannot be seen with the naked eye -Brainstorm particular applications of LC sensors.

2012-08-09

273

Basic Liquid Chromatography  

NSDL National Science Digital Library

This online textbook offers a variety of information on high performance liquid chromatography (HPLC). Topics covered include instruments, detectors, theory, column selection, and pH effect. This website also contains links to a glossary, useful links, and manufacturer websites.

Kazakevich, Yuri; Mcnair, Harold; Chemistry, Seton H.

274

Liquid-Cooled Garment  

NASA Technical Reports Server (NTRS)

A liquid-cooled bra, offshoot of Apollo moon suit technology, aids the cancer-detection technique known as infrared thermography. Water flowing through tubes in the bra cools the skin surface to improve resolution of thermograph image.

1977-01-01

275

Liquid Phase Heating Systems  

E-print Network

Liquid phase heating systems involve sensible heat transfer in a closed loop wherein a pumped fluid's temperature is raised in a heater, then lowered in a heat user and returned for reheating. No formation and condensation of vapor occurs. High...

Mordt, E. H.

1979-01-01

276

Liquid blocking check valve  

DOEpatents

A liquid blocking check valve useful particularly in a pneumatic system utilizing a pressurized liquid fill chamber. The valve includes a floatable ball disposed within a housing defining a chamber. The housing is provided with an inlet aperture disposed in the top of said chamber, and an outlet aperture disposed in the bottom of said chamber in an offset relation to said inlet aperture and in communication with a cutaway side wall section of said housing.

Merrill, John T. (Pleasant Hill, CA)

1984-01-01

277

Advanced proteomic liquid chromatography  

PubMed Central

Liquid chromatography coupled with mass spectrometry is the predominant platform used to analyze proteomics samples consisting of large numbers of proteins and their proteolytic products (e.g., truncated polypeptides) and spanning a wide range of relative concentrations. This review provides an overview of advanced capillary liquid chromatography techniques and methodologies that greatly improve separation resolving power and proteomics analysis coverage, sensitivity, and throughput. PMID:22840822

Xie, Fang; Smith, Richard D.; Shen, Yufeng

2012-01-01

278

Liquid scintillator sampling calorimetry  

E-print Network

LIQUID SCINTILLATOR SAMPLING CALORIMETRY A Thesis by R. GREG DUDGEON Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1994 Major... Subject: Physics LIQUID SCINTILLATOR SAMPLING CALORIMETRY A Thesis by R. GREG DUDGEON Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved...

Dudgeon, R. Greg

2012-06-07

279

Applications of ionic liquids.  

PubMed

Ionic liquids have recently gained popularity in the scientific community owing to their special properties and characteristics. One of the reasons why ionic liquids have been termed "green solvents" is due to their negligible vapour pressure. Their use in electrochemical, biological and metal extraction applications is discussed. Wide research has been carried out for their use in batteries, solar panels, fuel cells, drug deliveries and biomass pretreatments. This work aims to consolidate the various findings from previous works in these areas. PMID:22711528

Patel, Divia Dinesh; Lee, Jong-Min

2012-06-01

280

Control of fluidity and miscibility of a binary liquid mixture by the liquid-liquid transition  

NASA Astrophysics Data System (ADS)

Matter in its liquid state is convenient for processing and controlling chemical reactions, owing to its fluidity. Recently much evidence has been accumulated for the existence of a liquid-liquid transition (LLT) in single-component liquids. Here, we report that we can control, by the LLT of a molecular liquid, triphenyl phosphite (TPP), the fluidity and miscibility of its mixture with another molecular liquid. For a mixture of TPP with toluene or aniline, we find that both liquid I and II mix well and liquid II remains in a `liquid' state, in contrast to pure TPP, where liquid II is a non-ergodic amorphous state. This is the first example of a `true' LLT in a molecular liquid. Furthermore, we find demixing induced by the LLT for a mixture of TPP with diethyl ether or ethanol. These findings will open a new phase of research towards various applications of the LLT.

Kurita, Rei; Murata, Ken-Ichiro; Tanaka, Hajime

2008-08-01

281

Annonceur/DJ pour les matchs de hockey des Carabins Prsentation des joueurs des deux quipes avant le dbut de la rencontre  

E-print Network

Annonceur/DJ pour les matchs de hockey des Carabins T�ches : Pr�sentation des joueurs des deux�r�t fort pour le hockey f�minin, particuli�rement les �quipes des Carabins �tre dynamique et d�montrer de l'aisance au micro. �tre disponible pour tous les matchs � domicile de hockey f�minin des Carabins

Charette, André

282

The mechanics of liquid jets  

Microsoft Academic Search

Conservation laws for a liquid are considered along with aspects of jet instability, jet geometry, drop size upon jet breakup, the driven jet, and the sol-gel process and other applications of liquid jets. Macroscopic conservation equations for a liquid are examined and stability analyses of cylindrical liquid jets are conducted, taking into account an inviscid and a viscous free cylindrical

J. N. Anno

1977-01-01

283

Transmitting Electromagnetic Energy into Liquids  

NASA Technical Reports Server (NTRS)

Rough liquid surface enhances coupling. Agitating surface of liquid nitrogen bath with periodic or aperiodic excitation enhances electromagnetic coupling between microwave horn and blackbody temperature standard immersed in liquid. Useful in interfaces between electromagnetic radiation and liquids. Biomedical, radar, and meteorological applications.

Johnston, E. J.

1984-01-01

284

Liquid crystal lasers Andrii Varanytsia  

E-print Network

Liquid crystal lasers Andrii Varanytsia Class: LC Optics and Photonics, Spring 2012 Instructor crystal laser · Methods of control and tuning liquid crystal laser emission · Methods of emission enhancing and lowering lasing threshold in liquid crystal laser · Potential applications of liquid crystal

Palffy-Muhoray, Peter

285

Reprsentation des connaissances Traitement du langage naturel  

E-print Network

sémantique étudie comment les significations des mots sont combinés dans une structure de phrase pour, le calcul d'une structure de la phrase, habituellement en termes d'expressions, comme les groupes du Langage Naturel. Notre but sera de capturer la signification des phrases en détail. Cela va

Turenne, Nicolas

286

Zur Wirkung des Strophanthins bei Sauerstoffmangel  

Microsoft Academic Search

Zusammenfassung 1.Strophanthin ist nicht imstande, dieauseiner Hypoxämie resultierenden Schädigungen des Herzmuskels hintanzuhalten oder gar rückgängig zu machen.2.Rasche Injektion großer Strophanthindosen vermag sicherlich erhebliche Schädigung des unter Sauerstoffmangel leidenden Herzens hervorzurufen. Kleineren langsam injizierten Strophanthinmengen hingegen scheint kein derartig ungünstiger Effekt zuzukommen.

F. Kisch; H. Schwarz

1936-01-01

287

MOBILITE INTERNATIONALE DES ENSEIGNANTS-CHERCHEURS  

E-print Network

intensifs Erasmus, bourses CURIE, et des conventions bipartites ou multipartites. Dans le cadre de ces�alable entre les deux �tablissements). Financement : l'enseignant-chercheur b�n�ficie d'une bourse Erasmus de�es ci-dessus correspondent aux valeurs des indices en cours au 1er septembre 2012. Les grilles de

Dambrine, Marc

288

TLDTECTION ET GESTION DES CATASTROPHES NATURELLES  

E-print Network

analyse quantitative des facteurs de l'USLE. Le MNT, combiné aux données d'érosivité des pluies et d analysis of the USLE factors (Universal Soil Loss Equation factors). DEM-derived topographic data combined

Paris-Sud XI, Université de

289

Tables des mati`eres Introduction. 3  

E-print Network

groupe des unit'es circulaires, dans les articles [Si 1] et [Si 2].* * Aujourd'hui, celui-ci semble. 3 I Unit'es Cyclotomiques. 7 I.1 La formule d.5. 38 V Cohomologie des unit'es Cyclotomiques. 41 V.1 Quelques

Belliard, Jean-Robert

290

SECRETARIAT GENERAL Direction des ressources humaines  

E-print Network

- Languedoc Roussillon : test d'un nouveau concept Sodexo « Access » 1 #12;- Midi Pyrénées : obtention interministérielle « utilisation des produits Bio en restauration collective » 5. Présentation des solutions

Canet, Léonie

291

Probing liquid surface waves, liquid properties and liquid films with light diffraction  

Microsoft Academic Search

Surface waves on liquids act as a dynamical phase grating for incident light. In this paper, we revisit the classical method of probing such waves (wavelengths of the order of mm) as well as inherent properties of liquids and liquid films on liquids, using optical diffraction. A combination of simulation and experiment is proposed to trace out the surface wave

Tarun Kr Barik; Partha Roy Chaudhuri; Anushree Roy; Sayan Kar

2006-01-01

292

Structure, stability and behaviour of nucleic acids in ionic liquids  

PubMed Central

Nucleic acids have become a powerful tool in nanotechnology because of their conformational polymorphism. However, lack of a medium in which nucleic acid structures exhibit long-term stability has been a bottleneck. Ionic liquids (ILs) are potential solvents in the nanotechnology field. Hydrated ILs, such as choline dihydrogen phosphate (choline dhp) and deep eutectic solvent (DES) prepared from choline chloride and urea, are ‘green’ solvents that ensure long-term stability of biomolecules. An understanding of the behaviour of nucleic acids in hydrated ILs is necessary for developing DNA materials. We here review current knowledge about the structures and stabilities of nucleic acids in choline dhp and DES. Interestingly, in choline dhp, A–T base pairs are more stable than G–C base pairs, the reverse of the situation in buffered NaCl solution. Moreover, DNA triplex formation is markedly stabilized in hydrated ILs compared with aqueous solution. In choline dhp, the stability of Hoogsteen base pairs is comparable to that of Watson–Crick base pairs. Moreover, the parallel form of the G-quadruplex is stabilized in DES compared with aqueous solution. The behaviours of various DNA molecules in ILs detailed here should be useful for designing oligonucleotides for the development of nanomaterials and nanodevices. PMID:25013178

Tateishi-Karimata, Hisae; Sugimoto, Naoki

2014-01-01

293

Critical-Like Phenomena Associated with Liquid-Liquid Transition in a Molecular Liquid  

NASA Astrophysics Data System (ADS)

Contrary to the conventional wisdom that there is only one unique liquid state for any material, recent evidence suggests that there can be more than two liquid states even for a single-component substance. The transition between these liquid states is called a liquid-liquid phase transition. We report the detailed experimental investigation on the kinetics of the continuous spinodal-decomposition-type transformation of one liquid into another for triphenyl phosphite. From the analysis of the linear regime, we found that the correlation length, ?, of fluctuations of the relevant order parameter diverges as ? = ?0[(TSD - T)/TSD]-? (where ?0 = 60 nm and ? = 0.5) while approaching the spinodal temperature, TSD. This is an indication of a critical-like anomaly associated with the liquid-liquid transition. We also revealed that the order parameter governing the liquid-liquid transition must be of a nonconserved nature.

Kurita, Rei; Tanaka, Hajime

2004-10-01

294

Experimental (solid + liquid) or (liquid + liquid) phase equilibria of (amine + nitrile) binary mixtures  

Microsoft Academic Search

(Solid+liquid) phase diagrams have been determined for (hexylamine, or octylamine, or 1,3-diaminopropane+acetonitrile) mixtures. Simple eutectic systems have been observed in these mixtures. (Liquid+liquid) phase diagrams have been determined for (octylamine, or decylamine+propanenitrile, or +butanenitrile) mixtures. Mixtures with propanenitrile and butanenitrile show immiscibility in the liquid phase with an upper critical solution temperature, UCST. (Solid+liquid) phase diagrams have been correlated using

Urszula Doma?ska; Ma?gorzata Marciniak

2007-01-01

295

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Instabilites et rupture d'un rideau liquide par amplifications  

E-print Network

instabilities, free-surface flows 1 Introduction La stabilit´e et la dynamique d'une nappe liquide verticale obstacle ´etant introduit dans la nappe. L'un des points encore non r´esolus, est de pr´edire un crit] ont d´emontr´e qu'il existe deux types d'ondes de surface dans une nappe liquide : les ondes sinueuses

Brunet, Philippe

296

Soyez forms et challengs par des entrepreneurs expriments Des ateliers pratiques pour lancer et faire crotre votre entreprise  

E-print Network

Soyez formés et challengés par des entrepreneurs expérimentés Des ateliers pratiques pour lancer et conçues par des entrepreneurs pour des entrepreneurs. Elles sont l'occasion pour les participants, que ce jalons, non seulement d'apprendre les ficelles pour être un entrepreneur à succès, mais d

Rochaix, Jean-David

297

Conflits autour des ISDND, quelles consquences pour la gouvernance territoriale des dchets ? colloque de l'ASRDLF  

E-print Network

Conflits autour des ISDND, quelles conséquences pour la gouvernance territoriale des déchets ? 4 XLVIème colloque de l'ASRDLF CONFLITS AUTOUR DES ISDND, QUELLES CONSEQUENCES POUR LA GOUVERNANCE et sont font donc souvent l'objet de conflits rendant la gouvernance territoriale des déchets

Paris-Sud XI, Université de

298

Liquid Crystals: LCD Displays  

NSDL National Science Digital Library

In this activity, by the Concord Consortium's Molecular Literacy project, students will learn the history and applications of liquid crystal technology. This interactive presentation will allow students to not only learn about the technology, but it will actually allow them to analyze and work with examples. Everything from flat panel televisions to mood rings are used to show how liquid crystal plays an integral role in many products. The activity itself is a java-based interactive resource built upon the free, open source Molecular Workbench software. In addition, visitors will find an overview of the activity, assessments, and concepts and their correlation to AAAS and NSES standards.

2008-10-08

299

Liquid xenon scintillation spectrometer  

NASA Astrophysics Data System (ADS)

A liquid xenon scintillation detector has been worked out. Liquid xenon fills up a volume 27 mm diameter by 12-30 mm long inside a quartz cylinder with a teflon reflector. Both ends of the cylinder are sealed with photomultipliers with quartz windows. The energy resolution of the detector was found to be of the same order of magnitude as NaI(Tl) crystals for the energy 120 KeV. However, the resolution increases for the higher energies and comes up to 15% for 662 KeV. The reasons of such deterioration of resolution with increasing energy are discussed.

Barabanov, I. R.; Gavrin, V. N.; Pshukov, A. M.

1987-02-01

300

Electroplating Using Ionic Liquids  

NASA Astrophysics Data System (ADS)

Electroplating is a key technology in many large-scale industrial applications such as corrosion-resistant and decorative coatings. Issues with current aqueous processes, such as toxicity of reagents and low current efficiencies, can often be overcome by using ionic liquids, and this approach has turned ionometallurgy into a fast-growing area of research. This review outlines the interactions in ionic liquids that are responsible for the advantageous properties of these solvents in electroplating. It summarizes recent research in which these properties have been analyzed or exploited and highlights fundamental issues in research and technology that need to be addressed.

Abbott, Andrew P.; Frisch, Gero; Ryder, Karl S.

2013-07-01

301

Structure of Liquid Boron  

SciTech Connect

The structure factor S(Q) and the pair distribution function g(r) has been measured for liquid boron in the temperature range 2600{endash}2000thinspthinspK, extending over both the normal and supercooled liquid states. The bond length and coordination number of the first coordination shell are similar to those reported for the crystalline and amorphous solid forms, but the second and third coordination shells are broader and shifted to higher distances. The insulator-metal transition that takes place in boron upon melting is associated with a relatively small change in both volume and short-range order. {copyright} {ital 1998} {ital The American Physical Society}

Krishnan, S.; Felten, J.J. [Containerless Research, Inc., 906 University Place, Evanston, Illinois 60201 (United States)] [Containerless Research, Inc., 906 University Place, Evanston, Illinois 60201 (United States); Ansell, S.; Volin, K.J.; Price, D.L. [Argonne National Laboratory, Argonne, Illinois 60439 (United States)] [Argonne National Laboratory, Argonne, Illinois 60439 (United States)

1998-07-01

302

Structure of Liquid Boron  

NASA Astrophysics Data System (ADS)

The structure factor S\\(Q\\) and the pair distribution function g\\(r\\) has been measured for liquid boron in the temperature range 2600-2000 K, extending over both the normal and supercooled liquid states. The bond length and coordination number of the first coordination shell are similar to those reported for the crystalline and amorphous solid forms, but the second and third coordination shells are broader and shifted to higher distances. The insulator-metal transition that takes place in boron upon melting is associated with a relatively small change in both volume and short-range order.

Krishnan, S.; Ansell, S.; Felten, J. J.; Volin, K. J.; Price, D. L.

1998-07-01

303

Liquid cargo container  

SciTech Connect

A double-tank shipping container for general bulk liquid cargo, the container being constituted by a sea-going vessel having a single hull provided with a hold which defines the outer tank of the container and a prefabricated flexible bladder forming an inner tank received within the outer tank and readily removable therefrom. The inner tank has a configuration roughly conforming to the contours of the outer tank and yet capable of sustaining the liquid cargo in the event of a rupture in the outer tank, thereby to prevent spillage from the vessel and to avoid pollution of the seas.

Kohn, J.; Roberts, W.M.

1980-10-28

304

Improved Capacitive Liquid Sensor  

NASA Technical Reports Server (NTRS)

Improved capacitive sensor used to detect presence and/or measure thickness of layer of liquid. Electrical impedance or admittance of sensor measured at prescribed frequency, and thickness of liquid inferred from predetermined theoretical or experimental relationship between impedance and thickness. Sensor is basically a three-terminal device. Features interdigitated driving and sensing electrodes and peripheral coplanar ground electrode that reduces parasitic effects. Patent-pending because first to utilize ground plane as "shunting" electrode. System less expensive than infrared, microwave, or refractive-index systems. Sensor successfully evaluated in commercial production plants to characterize emulsions, slurries, and solutions.

Waldman, Francis A.

1992-01-01

305

Universality of liquid dynamics  

E-print Network

We investigate the origin of the Stokes-Einstein relation in liquids. The hard-sphere dynamics is analyzed using a new measure of structural relaxation - the minimum Euclidean distance between configurations of particles. It is shown that the universal relation between the structural relaxation and diffusion in liquids is caused by the existence of one dominating length scale imposed by the structural correlations and associated with de Gennes narrowing. We demonstrate that this relation can be described by a model of independent random walkers under the single-occupancy constraint.

Tomas Oppelstrup; Babak Sadigh; Srikanth Sastry; Mikhail Dzugutov

2005-09-16

306

Motor Frame Cooling with Hot Liquid Refrigerant and Internal Liquid.  

National Technical Information Service (NTIS)

This invention presents the device and method for cooling electric machines with hot liquid refrigerant in a floating refrigerant loop and using an internal liquid such as oil for enhancing the cooling effects. The electric machine cooling apparatus has a...

J. S. Hsu, C. W. Ayers, C. Coomer

2005-01-01

307

Mixed Stationary Liquid Phases for Gas-Liquid Chromatography.  

ERIC Educational Resources Information Center

Describes a laboratory technique for use in an undergraduate instrumental analysis course that, using the interpretation of window diagrams, prepares a mixed liquid phase column for gas-liquid chromatography. A detailed procedure is provided. (BT)

Koury, Albert M.; Parcher, Jon F.

1979-01-01

308

138. LIQUID NITROGEN INSTRUMENT PANEL ON EAST WALL OF LIQUID ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

138. LIQUID NITROGEN INSTRUMENT PANEL ON EAST WALL OF LIQUID NITROGEN CONTROL ROOM (115), LSB (BLDG. 770) - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 West, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

309

Spontaneous liquid-liquid phase separation of water  

NASA Astrophysics Data System (ADS)

We report a molecular dynamics simulation demonstrating a fast spontaneous liquid-liquid phase separation of water and a subsequent slow crystallization to ice. It is found that supercooled water separates rapidly into low- and high-density domains so as to reduce the surface energy in the rectangular simulation cell at certain thermodynamic states. The liquid-liquid phase separation, which is about two orders of magnitude faster than the crystallization, suggests a possibility to observe this phenomenon experimentally.

Yagasaki, Takuma; Matsumoto, Masakazu; Tanaka, Hideki

2014-02-01

310

On the instability of liquid jet and liquid curtain  

Microsoft Academic Search

The spatial instability of liquid jets and liquid curtains is investigated by using linear theory. For the case of a viscous liquid jet into an inviscid ambient gas, a unified theory is developed. It is found that the existing theories, including Rayleigh, Keller, Taylor, and Chandrasekhar's modes, are only special cases of the unified theory. Thus, this new theory would

Zhi Wen Lian

1990-01-01

311

Phenomena of liquid drop impact on solid and liquid surfaces  

Microsoft Academic Search

The fluid dynamic phenomena of liquid drop impact are described and reviewed. These phenomena include bouncing, spreading and splashing on solid surfaces, and bouncing, coalescence and splashing on liquid surfaces. Further, cavitation and the entrainment of gas into an impacted liquid may be observed. In order to distinguish properly between the results of different experiments different impact scenarios are discussed.

Martin Rein

1993-01-01

312

Enzymatic catalysis via liquid-liquid interfaces.  

PubMed

Enzymes acting in a biphasic liquid of water and organic solvent may show catalytic activity dependent on the amount of phase interface available. Such an effect may be caused by several mechanisms. For example, for hydroxynitrile lyase from Prunus amygdalus, substrate mass transfer limitation has been advocated, but also adsorption of the enzyme on the interface. In this commentary it is shown that often these two mechanisms will have qualitatively similar consequences. The reaction rate will be influenced by the organic substrate concentration, by the initial enzyme concentration, and by the volume-specific interfacial area, and these influences will be linear at low values but reach a saturation level at high values. To rule out any of the models, their quantitative mathematical descriptions should be compared, taking into account that both models may be valid simultaneously. PMID:12800131

Straathof, Adrie J J

2003-08-20

313

Optimisation des schemas d'ouverture des secteurs de contr^ole aerien par methodes classiques et algorithmes genetiques  

E-print Network

Optimisation des sch´emas d'ouverture des secteurs de contr^ole a´erien par m´ethodes classiques et plusieurs algorithmes construisant des configurations optimales de sec- teurs de contr^ole a´erien, en tenant compte du tra- fic pr´evu, des capacit´es des secteurs, et du nombre de positions de contr^ole

Paris-Sud XI, Université de

314

O-PRODUCTION DES INNOVATIONS ET EMANCIPATION DES ACTEURS : LE CAS DE LA RECHERCHE-ACTION EN PARTENARIAT  

E-print Network

.2.- La gouvernance de la RAP 1.3.- Le CCV : une innovation organisationnelle 1.4.- Le cadre éthique #12-élaboration de la RAP. #12;6 2. L'ELABORATION D'UN LANGAGE COMMUN : LE ROLE DES OBJETS INTERMEDIAIRES sont des même temps elles leur permettent une appropriation réelle des objectifs et des méthodologies des

Paris-Sud XI, Université de

315

La technique des incidents critiques pour cerner l'efficacité des feed-back de correction en danse moderne  

Microsoft Academic Search

Résumé — Les études descriptives en classe de danse ont démontré qu'une des principales habiletés d'intervention des professeurs consiste à corriger les erreurs d'exécutions motrices des étudiants. Les professeurs utilisent à cette fin un vaste éventail de stratégies. Y a-t- il des stratégies plus efficaces que d'autres? Pour répondre à cette question, la méthodologie qualitative des incidents critiques a été

Sylvie Fortin

1988-01-01

316

Modélisation et simulation à topologie variable des convertisseurs statiques et des entraînements électromécaniques  

NASA Astrophysics Data System (ADS)

This paper deals with the automatic modeling with changeable topology of static converters (ideal discret-time modeling of switches), mainly for their own simulation and specifically the one of electric drives. Nous proposons une approche pour synthétiser automatiquement le modèle à topologie variable des convertisseurs statiques (modèle discret idéal des semi-conducteurs), principalement en vue de leur propre simulation et notamment celle des entraînements électromécaniques.

Gerbaud, L.; Lechevalier, C.; Bolopion, A.; Bigeon, J.

1998-06-01

317

Implication des lipides dans la variabilit gn-tique des caractristiques technologiques de la  

E-print Network

farine et du gluten de blé tendre Bernard LAIGNELET Catherine CANTIN LN.R.A., Laboratoire de Technologie viscoélastiques du gluten de farines de blé tendre et la quantité et la répartition des lipides dans le gluten entier ou des fractions de ce gluten. Pour cela 23 échantillons, choisis au hasard parmi des lignées en

Paris-Sud XI, Université de

318

Le pouvoir d'achat des actions, des obligations et de l'or  

Microsoft Academic Search

[fre] L'évolution de la valeur d'un portefeuille représentatif des titres cotés en bourse permet le calcul du taux d'intérêt d'un placement à long terme. Si l'on suppose la capitalisation annuelle des dividendes, le pouvoir d'achat d'un capital formé de valeurs à revenu variable demeure supérieur à celui de la monnaie, pendant la plus grande partie des périodes 1938 à 1969

Pierre Laforest

1969-01-01

319

SPARATION DES SPECTRES DES DIVERS ORDRES DU CADMIUM par M. FLIX ESCLANGON,  

E-print Network

S�PARATION DES SPECTRES DES DIVERS ORDRES DU CADMIUM par M. F�LIX ESCLANGON, Ecole Normale Supérieure, Paris. Sommaire. 2014 Nous avons appliqué au cadmium la méthode de séparation des raies dues aux parcourt quelques spires entourant un tube à cadmium et l'illumine si la température est convenable. Le

Paris-Sud XI, Université de

320

Mesure de la digestibilit des fourrages destins aux chevaux par la technique des sacs de nylon  

E-print Network

Mesure de la digestibilité des fourrages destinés aux chevaux par la technique des sacs de nylon selle adultes et par la technique des sacs de nylon sur 2 poneys mâles, adultes, munis d'une canule heures selon la méthode de TILLEY et TERRY (1963), puis le sac est introduit dans le caecum pour une

Boyer, Edmond

321

Über das Wachstum der Legeröhre des Bitterlings unter dem Einfluß des weiblichen Sexualhormons II  

Microsoft Academic Search

Zusammenfassung 1.Zusatz von 5–8 M.E. Progynon pro Kubikzentimeter zum Aquarienwasser bewirkte innerhalb 48 Stunden ein Wachsen der während der Ruhezeit reduzierten Legeröhre des Bitterlingweibchens bis zu einer Länge von 20 mm; dieses durch Hormonzufuhr während der Ruhezeit hervorgerufene Wachstum entspricht vollkommen dem Wachstum der Legeröhre des Bitterlingweibchens zur Laichzeit.2.Beim kastrierten Männchen des Bitterlings bewirkt Zusatz von Progynon zum Aquarienwasser oder

Walter Fleischmann; Susanne Kann

1934-01-01

322

Über eine Funktion des weiblichen Sexualhormons bei Fischen (Wachstum der Legeröhre des Bitterlings)  

Microsoft Academic Search

Zusammenfassung 1.Injektion von Follikelhormon (Progynon Schering) bewirkte während der Ruhezeit Wachstum der Legeröhre des Bitterlingweibchens, das sonst nur zur Laichzeit auftritt.2.Mit physiologischer Kochsalzlösung oder Hypophysenvorderlappenhormon (Prolan) behandelte Tiere zeigten kein Wachstum der Legeröhre.3.Implantation von Bitterlingsovar auf kastrierte Nagerweibchen rief Auftreten des Oestrus hervor.4.Diese Befunde sprechen für die Auffassung des Wachstums der Legeröhre als einer Wirkung der in den Fischovarien produzierten

Walter Fleischmann; Susanne Kann

1932-01-01

323

Scurit collective et nouvelles menaces Des rsistances dpasser, des chemins ouvrir  

E-print Network

: environment, climate change, public health, technology, social dynamics, geostrategy, violence. 9Sécurité collective et nouvelles menaces Des résistances à dépasser, des chemins à ouvrir Patrick:labecox@poly.polytechnique.fr hal-00242942,version1-6Feb2008 #12;Sécurité collective et nouvelles menaces Des résistances à dépasser

Boyer, Edmond

324

Optimisation de procds de BIOdpollution des eaux souterraines contamines par des hydrocarbures par un monitoring  

E-print Network

BIOPHY est de développer une nouvelle filière de traitement in situ de nappe basée sur : le surveillance (géophysiques et d'analyse de gaz) pour optimiser des bio-traitements de sol et de nappe de la dépollution des nappes d'eau souterraine, contaminées par des mélanges de composés organiques d

Demouchy, Sylvie

325

Implication financière des GES pour le développement des systèmes photovoltaïques de pompage de l'eau  

Microsoft Academic Search

d'eau pompé par des systèmes PV en tenant compte d'une part des réductions de gaz à effet de serre (GES) et des réalités du marché algérien d'autre part. Abstract - In the of the Sahara regions of Algeria the underground water constitutes the only alternative to satisfy the vital needs of inhabitants, consumption and irrigation. For it, the most used

B. Bouzidi; M. Haddadi

326

Energy efficient liquid cooling  

Microsoft Academic Search

The theme of this paper is an investigation of the hydrodynamic performance of liquid pumps for electronics cooling applications, considered in conjunction with a range of primary heat exchangers. Pressure-flow characteristics of a set of geometrically- similar, miniature-scale centrifugal pumps are measured, and reductions in hydrodynamic efficiency are seen to occur below a critical Reynolds number. Six primary heat exchangers

Jeff Punch

2008-01-01

327

Time Sequence Liquid Dominant  

E-print Network

Time Sequence Liquid Dominant Evaporation De-pinning Dryout Progress Formation of Nanoparticle of Nanofluid Droplets on a Microheater Array 2-nm Au 20nm 47-nm Al2O3 Distilled Water 30-nm CuO Microheater to examine the effect of nanoparticle sizes on the dryout characteristics. While the distilled water droplet

Kihm, IconKenneth David

328

Thermodynamics of liquid metal  

SciTech Connect

The thermodynamics of a liquid metal based on quantum-mechanical models of the crystal, electronic, and nuclear structures of the metal are derived in this paper. The models are based on such formulations as the Bohr radius, the Boltzmann constant, the Planck Law, the Fermi surface, and the Pauli principle.

Kushnirenko, A.N.

1988-01-01

329

Realistic Animation of Liquids  

Microsoft Academic Search

We present a comprehensive methodology for realistically animating liquid phenomena. Our ap- proach unifies existing computer graphics techniques for simulating fluids and extends them by incorporating more complex behavior. It is based on the Navier-Stokes equations which couple momentum and mass conservation to completely describe fluid motion. Our starting point is an environment containing an arbitrary distribution of fluid, and

Nick Foster; Dimitris N. Metaxas

1996-01-01

330

Clean room wiping liquids  

SciTech Connect

A water-based liquid containing isopropyl alcohol, ammonium hydroxide, and surfactants was developed to replace 1,1,2-trichlorotrifluoroethane for the dampening of clean room wiping cloths used to wipe clean benches, clean room equipment, and latex finger cots and gloves.

Harding, W.B.

1991-12-01

331

Properties of Liquid Plutonium  

SciTech Connect

Unalloyed polycrystalline Pu displays extreme thermal expansion behavior, i.e., {alpha} {yields} {beta} {yields} {gamma} {yields} {delta} increases by 25% in volume and {delta} {yields} {var_epsilon} {yields} liquid decreases by 4.5% in volume. Thus, making it difficult to measure density into the liquid state. Dilatometer outfitted with CaF molten metal cell offers a proven capability to measure thermal expansion in molten metals, but has yet to be proven for Pu. Historic data from the liquid nuclear fuels program will prove extremely useful as a guide to future measurements. 3.3at% Ga changes Pu molten metal properties: 50% increase in viscosity and {approx}3% decrease in density. Fe may decrease the density by a small amount assuming an averaging of densities for Pu-Ga and Pu-Fe liquids. More recent Boivineau (2009) work needs some interpretation, but technique is being employed in (U,Pu)O{sub 2} nuclear fuels program (Pu Futures, 2012).

Freibert, Franz J. [Los Alamos National Laboratory; Mitchell, Jeremy N. [Los Alamos National Laboratory; Schwartz, Daniel S. [Los Alamos National Laboratory; Saleh, Tarik A. [Los Alamos National Laboratory; Migliori, Albert [Los Alamos National Laboratory

2012-08-02

332

Ferroelectric liquid crystal display  

NASA Technical Reports Server (NTRS)

A ferroelectric liquid crystal display device employs capacitance spoiling layers to minimize unneeded capacitances created by crossovers of X and Y address lines and to accurately define desired capacitances. The spoiler layers comprise low dielectric constant layers which space electrodes from the ferroelectric at crossover points where capacitance is not needed for device operation.

York, Paul K. (Inventor)

1977-01-01

333

Hydrophobic ionic liquids  

Microsoft Academic Search

Ionic liquids having improved properties for application in non-aqueous batteries, electrochemical capacitors, electroplating, catalysis and chemical separations are disclosed. Exemplary compounds have one of the following formulas shown in a diagram wherein Râ, Râ, Râ, Râ, Râ, and Râ are either H; F; separate alkyl groups of from 1 to 4 carbon atoms, respectively, or joined together to constitute a

V. R. Koch; C. Nanjundiah; R. T. Carlin

1998-01-01

334

Liquid rocket valve components  

NASA Technical Reports Server (NTRS)

A monograph on valves for use with liquid rocket propellant engines is presented. The configurations of the various types of valves are described and illustrated. Design criteria and recommended practices for the various valves are explained. Tables of data are included to show the chief features of valve components in use on operational vehicles.

1973-01-01

335

Viscosity Of Liquids - Experiment  

NSDL National Science Digital Library

Classroom experiment to illustrate the viscosity of different liquids by measuring how quickly pebbles sink through them. The site describes all of the required material for the experiment and also gives a detailed chart for recording the results of the experiment. Altogether, the site is a great activity for the classroom.

2008-10-07

336

Schrodinger Fermi Liquids  

E-print Network

A class of strongly interacting many-body fermionic systems in 2+1D non-relativistic conformal field theory is examined via the gauge-gravity duality correspondence. The 5D charged black hole with asymptotic Schrodinger isometry in the bulk gravity side introduces parameters of background density and finite particle number into the boundary field theory. We propose the holographic dictionary, and realize a quantum phase transition of this fermionic liquid with fixed particle number by tuning the background density $\\beta$ at zero temperature. On the larger $\\beta$ side, we find the signal of a sharp quasiparticle pole on the spectral function A(k,w), indicating a well-defined Fermi surface. On the smaller $\\beta$ side, we find only a hump with no sharp peak for A(k,w), indicating the disappearance of Fermi surface. The dynamical exponent $z$ of quasiparticle dispersion goes from being Fermi-liquid-like $z\\simeq1$ scaling at larger $\\beta$ to a non-Fermi-liquid scaling $z\\simeq 3/2$ at smaller $\\beta$. By comparing the structure of Green's function with Landau Fermi liquid theory and Senthil's scaling ansatz, we further investigate the behavior of this quantum phase transition.

Juven Wang

2013-01-09

337

Detonation in Liquid Explosives  

Microsoft Academic Search

DURING the War a general investigation was commenced at the Road Research Laboratory, on the initiative of Dr. A. H. Davis, into the process of detonation in explosives, the programme including a photographic study of the detonation Waves in transparent liquid explosives-the sensitivity of some of which can be varied by adjusting the constitution-and their relation to primers of different

D. Croney

1948-01-01

338

Solid, Liquid or Gas?  

NSDL National Science Digital Library

Students are given a variety of materials and asked to identify if each material as a solid, liquid or gas. They use their five senses â sight, sound, smell, texture and taste â to identify the other characteristics of each item.

Integrated Teaching And Learning Program

339

Liquid Drop Art  

NSDL National Science Digital Library

This collection showcases the work of artist Corrie White, who has combined photographic techniques, use of different liquids, and precise production of drops to produce striking and original images of drops and soap films. Her work has been featured on the APS Division of Fluid Dynamics 2012 Image Gallery. The site includes a link to tutorials that present her methods.

White, Corrie

2013-01-25

340

Transflective liquid crystal displays  

Microsoft Academic Search

In this review paper, a detailed overview of the transflective liquid crystal display (LCD) technology is presented. We first introduce the transflector classifications based on their composition and properties. Then, in reviewing the development history, we investigate the mainstream transflective LCDs, including their operating principles, advantages, and disadvantages. Finally, the image quality issues of transflective LCDs, such as color balance,

Xinyu Zhu; Zhibing Ge; Thomas X. Wu; Shin-Tson Wu

2005-01-01

341

Liquid Scintillation Counting Technique  

Microsoft Academic Search

3 INCDIE ICPE- CA, 313 Splaiul Unirii, 030138, Bucharest, Romania The method applied to the evaluation of radiation activities implies sample preparation, liquid scintillation cocktail choosing, quench standard curve constructing and implementation, and results verification. We have constructed the quench curve using interpolation method by polynomial spline functions of three degree. In order to evaluate the measurement efficiencies of tritium

MAGDALENA DIANU; CORNELIU PODINA; TRAIAN ZAHARESCU

342

Liquid Cooled Garments  

NASA Technical Reports Server (NTRS)

Astronauts working on the surface of the moon had to wear liquid-cooled garments under their space suits as protection from lunar temperatures which sometimes reach 250 degrees Fahrenheit. In community service projects conducted by NASA's Ames Research Center, the technology developed for astronaut needs has been adapted to portable cooling systems which will permit two youngsters to lead more normal lives.

1979-01-01

343

Liquid Rocket Engine Testing  

NASA Technical Reports Server (NTRS)

Comprehensive Liquid Rocket Engine testing is essential to risk reduction for Space Flight. Test capability represents significant national investments in expertise and infrastructure. Historical experience underpins current test capabilities. Test facilities continually seek proactive alignment with national space development goals and objectives including government and commercial sectors.

Rahman, Shamim

2005-01-01

344

The SNS Liquids Reflectometer  

SciTech Connect

The SNS Liquids Reflectometer [1], installed as one of the first instruments at the Spallation Neutron Source, has now been functional for more than a year. This instrument is designed to view liquid and solid surfaces in specular, off specular, and near-surface small angle scattering geometries. The guide system supplies 2 {angstrom} < {angstrom} < 16.5 {angstrom} neutrons at vertical incident angles ranging from 0{sup o} < {alpha}{sub i} < 5.5{sup o} for free liquid surfaces and up to 45{sup o} for solid surfaces. Three bandwidth choppers, synchronized with the spallation source and operating at 15-60 Hz, provide neutrons in bandwidths ranging from 3.5-14 {angstrom} at a fixed incident angle onto a sample. The sample stage enables all of the motions necessary for positioning liquid and solid surfaces, while the detector arm directs a position-sensitive detector to view the sample at specular or off specular angles up to 90{sup o} and can scan out of the specular plane by up to 30{sup o}.

Ankner, John Francis [ORNL; Tao, Xiaodong [ORNL; Halbert, Candice E [ORNL; Browning, Jim [ORNL; Kilbey, II, S Michael [ORNL; Swader, Onome A [ORNL; Dadmun, Mark D [ORNL; Kharlampieva, Dr. Eugenia [Stevens Institute of Technology, Hoboken, New Jersey; Sukhishvili, Prof. Svetlana A. [Stevens Institute of Technology, Hoboken, New Jersey

2008-01-01

345

Black Liquid Solar Collector Demonstrator.  

ERIC Educational Resources Information Center

Describes the details of constructing, and use of, a solar collector. Uses a black liquid to absorb the energy, the thermosyphon effect to drive the liquid through the collector, and a floodlamp as a surrogate sun. (GA)

Weichman, F. L.; Austen, D. J.

1979-01-01

346

Demonstrating Paramagnetism Using Liquid Nitrogen.  

ERIC Educational Resources Information Center

Describes how liquid nitrogen is attracted to the poles of neodymium magnets. Nitrogen is not paramagnetic, so the attraction suggests that the liquid nitrogen contains a small amount of oxygen, which causes the paramagnetism. (MVL)

Simmonds, Ray; And Others

1994-01-01

347

Liquid Crystals - The Mainstream Game  

NSDL National Science Digital Library

A liquid crystal is a substance that flows like a liquid but maintains some of the ordered structure characteristic of crystals. Play this game to see how the crystal moves around in different patterns.

Foundation, Nobel

348

Rockets using Liquid Oxygen  

NASA Technical Reports Server (NTRS)

It is my task to discuss rocket propulsion using liquid oxygen and my treatment must be highly condensed for the ideas and experiments pertaining to this classic type of rocket are so numerous that one could occupy a whole morning with a detailed presentation. First, with regard to oxygen itself as compared with competing oxygen carriers, it is known that the liquid state of oxygen, in spite of the low boiling point, is more advantageous than the gaseous form of oxygen in pressure tanks, therefore only liquid oxygen need be compared with the oxygen carriers. The advantages of liquid oxygen are absolute purity and unlimited availability at relatively small cost in energy. The disadvantages are those arising from the impossibility of absolute isolation from heat; consequently, allowance must always be made for a certain degree of vaporization and only vented vessels can be used for storage and transportation. This necessity alone eliminates many fields of application, for example, at the front lines. In addition, liquid oxygen has a lower specific weight than other oxygen carriers, therefore many accessories become relatively larger and heavier in the case of an oxygen rocket, for example, the supply tanks and the pumps. The advantages thus become effective only in those cases where definitely scheduled operation and a large ground organization are possible and when the flight requires a great concentration of energy relative to weight. With the aim of brevity, a diagram of an oxygen rocket will be presented and the problem of various component parts that receive particularly thorough investigation in this classic case but which are also often applicable to other rocket types will be referred to.

Busemann, Adolf

1947-01-01

349

Microfabricated Liquid Rocket Motors  

NASA Technical Reports Server (NTRS)

Under NASA Glenn Research Center sponsorship, MIT has developed the concept of micromachined, bipropellant, liquid rocket engines. This is potentially a breakthrough technology changing the cost-performance tradeoffs for small propulsion systems, enabling new applications, and redefining the meaning of the term low-cost-access-to-space. With this NASA support, a liquid-cooled, gaseous propellant version of the thrust chamber and nozzle was designed, built, and tested as a first step. DARPA is currently funding MIT to demonstrate turbopumps and controls. The work performed herein was the second year of a proposed three-year effort to develop the technology and demonstrate very high power density, regeneratively cooled, liquid bipropellant rocket engine thrust chamber and nozzles. When combined with the DARPA turbopumps and controls, this work would enable the design and demonstration of a complete rocket propulsion system. The original MIT-NASA concept used liquid oxygen-ethanol propellants. The military applications important to DARPA imply that storable liquid propellants are needed. Thus, MIT examined various storable propellant combinations including N2O4 and hydrazine, and H2O2 and various hydrocarbons. The latter are preferred since they do not have the toxicity of N2O4 and hydrazine. In reflection of the newfound interest in H2O2, it is once again in production and available commercially. A critical issue for the microrocket engine concept is cooling of the walls in a regenerative design. This is even more important at microscale than for large engines due to cube-square scaling considerations. Furthermore, the coolant behavior of rocket propellants has not been characterized at microscale. Therefore, MIT designed and constructed an apparatus expressly for this purpose. The report details measurements of two candidate microrocket fuels, JP-7 and JP-10.

Epstein, Alan H.; Joppin, C.; Kerrebrock, J. L.; Schneider, Steven J. (Technical Monitor)

2003-01-01

350

Contrôle des Circuits Auxiliaires des P.F.W. (arrêt machine 2003/2004)  

E-print Network

Les PFW sont des nappes polaires installées sur les pôles des aimants du PS. Elles sont au nombre de 4 par unité d'aimant et constituées d'un circuit principal (dans lequel circule le courant désiré selon le cycle magnétique utilisé) et des circuits auxiliaires. Les circuits auxiliaires sont des enroulements de correction (boucles de tour et "pick-up" brasés sur les enroulements principaux). Pendant la variation du champ magnétique del'aimant PS, on utilise des tensions induites dans ces circuits auxiliaires pour corriger les erreurs de champ dues aux pertes par courants de Foucault dans la chambre à vide. Chaque année, pendant l'arrêt machine, on vérifie si les caractéristiques des circuits auxiliaires correspondent aux normes (mesures de résistances des boucles de tours, résistances entre "pick-up" et isolation des circuits) afin de faire un suivi. Les 404 PFW sont ainsi vérifiées. Dans cette note, on ne relèvera que les PFW ayant des défauts (valeurs hors tolérances, boucles ouvertes ...

Ottaviani, J

2004-01-01

351

Contrôle des Circuits Auxiliaires des PFW (arrêt machines 2002/2003)  

E-print Network

Les PFW sont des nappes polaires installées sur les pôles des aimants du PS. Elles sont au nombre de 4 par unité d aimant et constituées d un circuit principal (dans lequel circule le courant désiré selon le cycle magnétique utilisé) et de circuits auxiliaires. Les circuits auxiliaires sont des enroulements de correction (boucles de tour et pick-up brasés sur les enroulements). Pendant la variation du champ magnétique de l aimant PS, on utilise des tensions induites dans ces circuits auxiliaires pour corriger les erreurs de champ dues aux courants de Foucault dans la chambre à vide. Chaque année, pendant l arrêt machine, on vérifie si les caractéristiques des circuits auxiliaires correspondent aux normes (mesures des résistances des boucles de tours, résistances entre pick-up et isolation des circuits) afin de faire un suivi. Les 404 PFW sont ainsi vérifiées. Dans cette note, on ne relèvera que les PFW ayant des défauts (valeurs hors tolérances, boucles ouvertes ou en court-circuit, déf...

Ottaviani, J

2003-01-01

352

Contrôle des circuits auxiliaires des P.F.W. (arret machine 2004/2006)  

E-print Network

Les PFW sont des nappes polaires installées sur les pôles des aimants du PS. Elles sont au nombre de 4 par unité d’aimant et constituées d’un circuit principal (dans lequel circule le courant désiré selon le cycle magnétique utilisé) et de circuits auxiliaires. Les circuits auxiliaires sont des enroulements de correction (boucles de tour et “pick-up” brasés sur les enroulements principaux). Pendant la variation du champ magnétique de l’aimant PS, on utilise des tensions induites dans ces circuits auxiliaires pour corriger les erreurs de champ dues aux pertes par courants de Foucault dans la chambre à vide. Chaque année, pendant l’arrêt machine, on vérifie si les caractéristiques des circuits auxiliaires correspondent aux normes (mesures des résistances des boucles de tours, résistances entre “pick-up” et isolation des circuits) afin de faire un suivi. Les 404 PFW sont ainsi vérifiées. Dans cette note, on ne relèvera que les PFW ayant des défauts (valeurs hors tolérances, ...

Ottaviani, J

2005-01-01

353

Mise en évidence d'états excités dans les spectres de photoionisation du cyclohexane et du diméthyl 2-2-butane liquides  

NASA Astrophysics Data System (ADS)

Excited states are probably occurring, at an intermediate stage, in the VUV photoionization process of liquid hydrocarbons, as suggested by a Stern-Volmer behaviour when interacting with electron quenchers. They are here detected in the VUV photoionization spectrum of cyclohexane and dimethyl-2-2-butane in liquid phase. Some of the discernable peaks can be assigned as valence and Rydberg states, yet observed in gas phase. Supplementary peaks are observed, the existence of which is to be interpretated. L'existence d'états excités dans le processus de photoionisation VUV des hydrocarbures en phase liquide - précédemment suggérée par l'observation de la loi de Stern-Volmer lors de l'interaction avec des capteurs d'électrons - est ici détectée en traçant le spectre de photoionisation VUV du cyclohexane et du diméthyl-2-2-butane purs en phase liquide. Certains des pics observés coïncident avec les états de valence et de Rydberg de ces mêmes corps en phase gaz. Il apparaît des pics supplémentaires dont la nature doit être précisée.

Casanovas, J.; Guelfucci, J. P.; Caselles, O.

1991-07-01

354

JOURNAL DE PHYSIQUE Colloque C6, supplment au n 8, Tome 39, aot 1978, page C6-1613 "NMR DETECTION WITH THE SQUID -APPLICATION TO LIQUID 3  

E-print Network

DETECTION WITH THE SQUID - APPLICATION TO LIQUID 3 H e " + R.A. Webb+ Argonne National Laboratory, Argonne'expériences de résonnance magnétique utilisant un SQUID. On traite en particulier le cas des mesures de for performing a variety of magnetic resonance expe- riments using a SQUID is presented. In particular

Paris-Sud XI, Université de

355

Liquid metal thermal electric converter  

DOEpatents

A liquid metal thermal electric converter which converts heat energy to electrical energy. The design of the liquid metal thermal electric converter incorporates a unique configuration which directs the metal fluid pressure to the outside of the tube which results in the structural loads in the tube to be compressive. A liquid metal thermal electric converter refluxing boiler with series connection of tubes and a multiple cell liquid metal thermal electric converter are also provided.

Abbin, Joseph P. (Albuquerque, NM); Andraka, Charles E. (Albuquerque, NM); Lukens, Laurance L. (Albuquerque, NM); Moreno, James B. (Albuquerque, NM)

1989-01-01

356

Mise jour concernant les concours des subventions Savoir, des subventions de dveloppement Savoir et des subventions de  

E-print Network

subventions Savoir ont une durée maximale plus longue et une variation de valeur potentielle plus étendue que montant de la valeur moyenne et la valeur médiane des attributions. (La figure 1 résume la distribution des budgets accordés.) Subventions Savoir : concours d'octobre 2011 Durée de la bourse Nombre de

Charette, André

357

Dissolving Different Liquids in Water  

NSDL National Science Digital Library

In this activity, learners add different liquids to water and apply their working definition of âdissolvingâ to their observations. After observing isopropyl rubbing alcohol, vegetable oil, and corn syrup in water, learners can conclude that while some liquids may dissolve in water, different liquids dissolve in water to different extents. Adult supervision recommended.

Kessler, James H.; Galvan, Patricia M.

2007-01-01

358

Liquid diffusion in fibrous insulation  

Microsoft Academic Search

Vapor condensation in insulated structures degrades their physical properties as well as thermal performance. Motion of the condensate within the insulation is a crucial factor in analyzing this phenomenon. The liquid diffusion can be caused by several driving potentials. A model for isothermal liquid transport in fibrous insulation is presented. The model relates liquid diffusion to the characteristics of the

S. Motakef; M. A. El-Masri

1983-01-01

359

Cavitation pressure in liquid helium  

Microsoft Academic Search

Recent experiments have suggested that, at low enough temperature, the homogeneous nucleation of bubbles occurs in liquid helium near the calculated spinodal limit. This was done in pure superfluid helium 4 and in pure normal liquid helium 3. However, in such experiments, where the negative pressure is produced by focusing an acoustic wave in the bulk liquid, the local amplitude

Frederic Caupin; Sebastien Balibar

2001-01-01

360

High temperature liquid level sensor  

DOEpatents

A length of metal sheathed metal oxide cable is perforated to permit liquid access to the insulation about a pair of conductors spaced close to one another. Changes in resistance across the conductors will be a function of liquid level, since the wetted insulation will have greater electrical conductivity than that of the dry insulation above the liquid elevation.

Tokarz, Richard D. (West Richland, WA)

1983-01-01

361

Zero gravity liquid transfer screen  

NASA Technical Reports Server (NTRS)

A liquid transfer device for use in a zero gravity environment, for transferring liquid from one container to another is described. The device includes a spiral shaped screen type member which is carried in the container for collecting the randomly dispersed liquid and transferring such to an exit port.

Howard, F. S. (inventor)

1973-01-01

362

Stimulated brillouin scattering in liquids  

E-print Network

to Dr. C. F. Squire for his wise advice and. patiently re- strained. guidance. TABLE OF CONTENTS Page ACKNOWLEDGEMENT ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 111 LIST OF FIGURES... these experiments, which were ultrasonic velocity and atten- uation measurements on liquid argon, there have arisen further questions about the liquid. state, which could only be answered by studying the velocity and attenuation of hypersonic waves in the liquid...

Hubert, Jay Marvin

2012-06-07

363

46 CFR 151.03-36 - Liquid.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Liquid. 151.03-36 Section 151.03-36...DANGEROUS CARGOES BARGES CARRYING BULK LIQUID HAZARDOUS MATERIAL CARGOES Definitions § 151.03-36 Liquid. In this part liquid includes...

2010-10-01

364

46 CFR 151.03-36 - Liquid.  

...2014-10-01 2014-10-01 false Liquid. 151.03-36 Section 151.03-36...DANGEROUS CARGOES BARGES CARRYING BULK LIQUID HAZARDOUS MATERIAL CARGOES Definitions § 151.03-36 Liquid. In this part liquid includes...

2014-10-01

365

46 CFR 151.03-36 - Liquid.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Liquid. 151.03-36 Section 151.03-36...DANGEROUS CARGOES BARGES CARRYING BULK LIQUID HAZARDOUS MATERIAL CARGOES Definitions § 151.03-36 Liquid. In this part liquid includes...

2013-10-01

366

46 CFR 151.03-36 - Liquid.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Liquid. 151.03-36 Section 151.03-36...DANGEROUS CARGOES BARGES CARRYING BULK LIQUID HAZARDOUS MATERIAL CARGOES Definitions § 151.03-36 Liquid. In this part liquid includes...

2011-10-01

367

46 CFR 151.03-36 - Liquid.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Liquid. 151.03-36 Section 151.03-36...DANGEROUS CARGOES BARGES CARRYING BULK LIQUID HAZARDOUS MATERIAL CARGOES Definitions § 151.03-36 Liquid. In this part liquid includes...

2012-10-01

368

La violence sociale est-elle une violence masculine ?1 En France, 88% des personnes mises en cause par la justice sont des hommes, 94 % des actes  

E-print Network

La violence sociale est-elle une violence masculine ?1 En France, 88% des personnes mises en cause enregistrés suite à des violences conjugales, 166 sont causés par des hommes... Quelles explications peut ou violences sur autrui. L'étude, portant sur 6000 sanctions, a été complétée par des entretiens

Paris-Sud XI, Université de

369

Dpartement des METIERS DE LA CULTURE  

E-print Network

Département des METIERS DE LA CULTURE Tourisme, Livre et Multimédia UFR LLSH DOSSIER DE CANDIDATURE* : Tourisme en espace rural (20 places) Tourisme et patrimoine du quotidien (20 places) * attention : vous

Heurteaux, Yanick

370

The enhancement of existing DES Maplet interface  

NASA Astrophysics Data System (ADS)

This study pertains to the process of Data Encryption Standard, DES. DES consists of encryption and decryption processes linked with mathematical elements such as algebra and number theory. Preliminary, studies revealed that most of mathematics students face a problem in understanding the complicated process of DES. In modern learning methods, learning environment becomes more interesting with the use of computer and a variety of mathematical software packages. Several mathematical softwares such as Maple, Mathematica, Mathlab and Sage were developed in order to fulfill the specific calculation requirements. Correspondingly, motivated from that, this study incorporated with Maple to enhance the existing DES Maplet interface to be more interactive and user-friendly compared to the original version.

Abdullah, Nur Lina; Mutalip, Rasidah Abdull; Abdullah, Kamilah

2014-07-01

371

Ontologiesprachen im Kontext des Semantik Web.  

E-print Network

Hauptseminar " Techniken des Semantic Web" 1 #12;entsprechenden Daten erm¨oglicht. Andererseits sollten die wurde der Name Semantic Web1 gegeben ([TBLL01, Pal01]). Damit eine Maschine die vielf¨altigen Daten

Pfeifer, Holger

372

Mutationen des Frizzled-4Gens  

Microsoft Academic Search

Zusammenfassung\\u000a Hintergrund  Die autosomal-dominante (familiäre) exsudative Vitreoretinopathie (adEVR) ist eine seltene, genetisch bedingte Erkrankung\\u000a des retinalen Gefäßsystems, die in schwer betroffenen Augen zur Blindheit führen kann. Eines der Krankheitsgene liegt auf\\u000a dem Chromosom 11q13–q23 und kodiert für das „frizzled-4-“ (FZD4-)Protein, das an der vaskulären Differenzierung beteiligt ist.\\u000a \\u000a \\u000a \\u000a Methode  Untersuchungen von Mitgliedern zweier Familien mit adEVR über 6 bzw. 4 Generationen und FZD4-Mutationsanalyse. \\u000a \\u000a \\u000a \\u000a Ergebnisse  Familie I

M. Müller; C. Kusserow; U. Orth; U. Klär-Dißars; H. Laqua; A. Gal

2008-01-01

373

Profil ?pid?miologique des tumeurs malignes primitives des glandes salivaires : ? propos de 154 cas  

PubMed Central

Introduction Les tumeurs des glandes salivaires sont des tumeurs rares représentant 3à 5% des tumeurs de la tête et du cou. La classification de l'OMS 2005 distingue les tumeurs épithéliales, les tumeurs mésenchymateuses, les tumeurs hématologiques et les tumeurs secondaires. Méthodes Notre travail consiste en une étude rétrospective réalisée sur une période de 10 ans allant de janvier 2002 à janvier 2012. Les critères d'inclusion étaient: l'âge, le sexe, le siège de la tumeur et le type histologique. Résultats L'incidence annuelle des tumeurs malignes primitives des glandes salivaires dans notre série était de 15 cas par an. Cent cinquante quatre cas de tumeurs malignes primitives des glandes salivaires ont été colligés sans prédominance de sexe (78 femmes (50,6%) et 76 hommes (49,4%)). La moyenne d'âge était de 60 ans avec des extrêmes de 4 et 83 ans et un pic de fréquence entre 51et 70 ans. Deux tiers des cas (65%) avaient une localisation au niveau des glandes principales avec 66 cas au niveau de la parotide (43%) et 34 cas au niveau de la glande sous maxillaire (22%). Cinquante quatre patients avaient une tumeur maligne des glandes salivaires accessoires (35%) dont 61% au niveau du palais. Aucun cas de tumeur maligne de la glande sublinguale n'a été recensé dans notre étude. Le type histologique prédominant dans notre série était le carcinome adénoïde kystique et retrouvé chez 43 patients (27,9%), suivi de l'adénocarcinome sans autre indication chez 37 patients (24%) puis du carcinome mucoépidermoïde chez 16 patients (10,4%) et de l'adénocarcinome polymorphe de bas grade également chez 16 patients (10. 4%). Conclusion Les tumeurs malignes des glandes salivaires représentent un ensemble hétérogène de maladies de caractérisation complexe et de fréquence variable. PMID:25120861

Setti, Khadija; Mouanis, Mohamed; Moumni, Abdelmounim; Maher, Mostafa; Harmouch, Amal

2014-01-01

374

Reprsentation des connaissances Traitement du langage naturel  

E-print Network

ne peuvent pas être étendues en structure de phrase finale. On note, cependant, que le parsing bottom avons généré des faits qui n'ont pas été introduit dans notre structure finale. #12;Diapo LN5 La parsing bottom-up, comme le parsing top- down, génère un travail redondant en ce qu'il génère des structures qui

Turenne, Nicolas

375

Rle communautaire des capitalistes sociaux dans Twitter  

E-print Network

Rôle communautaire des capitalistes sociaux dans Twitter Nicolas Dugué * --- Vincent Labatut sont des utilisateurs de médias sociaux tels que Twitter, ap­ pliquant diverses techniques pour obtenir rôles. Nous appliquons ensuite notre méthode à l'analyse d'un réseau représentant Twitter. Nos résultats

Recanati, Catherine

376

vnements Rares sur des Sries Temporelles Environnementales  

E-print Network

basée sur la théorie des valeurs extrêmes permettant d'estimer des changements globaux (pollution a statistical method based on the theory of extreme values to estimate global changes (pollution, change sont de plus en plus utilisés car ils peuvent se révéler très efficaces par leurs capacités à révéler

Boyer, Edmond

377

Modles de rpartition des populations domestiques animales  

E-print Network

Modèles de répartition des populations domestiques animales après migration par vagues à partir d'un centre d'origine J. J. LAUVERGNE Département de Génétique animale, Centre national de Recherches animales dans le monde, on a imaginé un modèle avec un centre d'origine d'où partent des migrations

Boyer, Edmond

378

COMPOSITION BIOCHIMIQUE DES FRUITS ET PERCEPTION GUSTATIVE  

E-print Network

évolutives dans les forêts tropicales Claude Marcel HLADIK Introduction Les espèces végétales et animales interactions entre espèces animales et végétales se sone produites, est présentée dans ce chapitre en fonc indirect d'aliment des espèces animales qui, à leur tour, constituent des sources d'aliments protéi- ques

Paris-Sud XI, Université de

379

DOSAGE BIOLOGIQUE DES HORMONES GONADOTROPES DE POISSONS  

E-print Network

DOSAGE BIOLOGIQUE DES HORMONES GONADOTROPES DE POISSONS PAR LE TEST DE MATURATION IN VITRO DES de dosages, par référence à l'efficacité d'une préparation gonadotrope standard testée sur les de l'hypophyse d'une truitelle immature. Elle peut être doublée par l'adjonction d'hydrocortisone (0

Paris-Sud XI, Université de

380

Equivalence Asymptotique des Expriences Statistiques Michael Nussbaum  

E-print Network

". Ce cadre théorique est devenu un standard pour la résolution du problème de l' efficacité des tests normality". This theoretical framework has become a standard tool for proving efficiency of tests exhaustives. Ce sont elles qui permettent en général de réduire la dimension des données par une

Nussbaum, Michael

381

Ultramtriques des matrodes M-ultramtriques subdominantes  

E-print Network

liens Géométrie tropicale des éventails de Bergman associés aux matroïdes Daria STEPANOVA CNRS, Université de Montpellier 2 Grenoble, 24 février 2011 Daria STEPANOVA �ventails de Bergman #12;Ultramétriques résultats : arbres philogénétiques ; généralisations. Daria STEPANOVA �ventails de Bergman #12

Pocchiola, Michel

382

Sedimentologie des Lias der Berchtesgadener Kalkalpen  

Microsoft Academic Search

Zusammenfassung  Ausgehend von der herrschenden Vorstellung einer Transgression roter Liaskalke zur Zeit des oberen Unterlias über ein subaerisch verkarstetes Dachsteinkallerelief, untersuchte ich die Liassedimente in den Berchtesgadener Alpen eingehender und unternahm vergleichende Begehungen im östlichen Hagengebirge, im Steinernen Meer und in den Steinbrüchen von Adnet.Die Sedimente des Lias liegen in einer Graukalk- und einer abwechslungsreicheren Rotkalk-Fazies (F.Fabricius 1962) vor. Ammoniten zeigten,

Hermann Jurgan

1968-01-01

383

Dimensionnement des reseaux WDM : Modelisation et approximation  

E-print Network

longueurs d'onde Contrainte wdm des chemins en conflit n'ont pas la m^eme couleur Quelle notion de conflit'onde Contrainte wdm des chemins en conflit n'ont pas la m^eme couleur Quelle notion de conflit ? · Objectif en conflit n'ont pas la m^eme couleur Quelle notion de conflit ? · Objectif : minimiser le co^ut de l

Jeannerod, Claude-Pierre

384

Bestimmung der Körperlänge und des Lebensalters menschlicher Feten auf Grund der ersten Hand und ersten Fußwurzelknochenmaße, sowie der Größe des Atlas und des Epistropheus-Wirbelbogens  

Microsoft Academic Search

Es wurden die Größenmaße des I. Hand- und des I. Fußwurzelknochens und des Atlas- und Epistropheuswirbelbogens von 138 totgeborenen oder wenige Stunden nach der Geburt gestorbenen menschlichen Feten — 71 Knaben und 67 Mädchen mit einer Länge von 9–55 cm — bestimmt.

I. Gy. Fazekas; F. Kósa

1967-01-01

385

Hydrophobic ionic liquids incorporating N-alkylisoquinolinium cations and their utilization in liquid-liquid separations.  

PubMed

The first examples of Room Temperature Ionic Liquids (RTIL) containing fused polycyclic N-alkylisoquinolinium cations ([Cnisoq]+) in combination with the bis(perfluoroethylsulfonyl)imide anion ([BETI]-) have been synthesized, characterized, and utilized in liquid-liquid partitioning from water; these salts have unexpectedly low melting points and give high distribution ratios for aromatic solutes, especially chlorobenzenes, between the RTIL and water. PMID:12240026

Visser, A E; Holbrey, J D; Rogers, R D

2001-12-01

386

Liquid filtration simulation  

SciTech Connect

We have a developed a computer code that simulates 3-D filtration of suspended particles in fluids in realistic filter structures. This code, being the most advanced filtration simulation package developed to date, provides LLNL and DOE with new capabilities to address problems in cleaning liquid wastes, medical fluid cleaning, and recycling liquids. The code is an integrated system of commercially available and LLNL-developed software; the most critical are the computational fluid dynamics (CFD) solver and the particle transport program. For the CFD solver, we used a commercial package based on Navier-Stokes equations and a LLNL-developed package based on Boltzman-lattice gas equations. For the particle transport program, we developed a cod based on the 3-D Langevin equation of motion and the DLVO theory of electrical interactions. A number of additional supporting packages were purchased or developed to integrate the simulation tasks and to provide visualization output.

Corey, I.; Bergman, W.

1996-06-01

387

Disintegration of liquid sheets  

NASA Technical Reports Server (NTRS)

The development, stability, and disintegration of liquid sheets issuing from a two-dimensional air-assisted nozzle is studied. Detailed measurements of mean drop size and velocity are made using a phase Doppler particle analyzer. Without air flow the liquid sheet converges toward the axis as a result of surface tension forces. With airflow a quasi-two-dimensional expanding spray is formed. The air flow causes small variations in sheet thickness to develop into major disturbances with the result that disruption starts before the formation of the main break-up region. In the two-dimensional variable geometry air-blast atomizer, it is shown that the air flow is responsible for the formation of large, ordered, and small chaotic 'cell' structures.

Mansour, Adel; Chigier, Norman

1990-01-01

388

Liquid evaporation light deflector.  

PubMed

A new type of general purpose digital light deflector is described, which is based on the electrically controlled vaporization of a high refractive index transparent liquid at an inclined interface formed by the liquid and a transparent solid. Deflectors operating on this principle can be designed to provide multiposition linear or angular displacement of a light beam in one or two dimensions. Such deflectors can be random accessed, are capable of large angular deflection, are simple and cheap to build, occupy a small volume, and should have a long operating life. Furthermore, they are not limited to deflecting only small diameter, monochromatic, polarized light beams. Millisecond deflection is possible at power levels of 0.3 W/mm(2) of light beam area. The deflectors have high optical transmission efficiency with on-off contrast ratios of 150: 1 and higher. PMID:20111551

Taylor, G W

1972-03-01

389

Electron Liquids in Semiconductor Quantum Structures  

SciTech Connect

The groups led by Stormer and Pinczuk have focused this project on goals that seek the elucidation of novel many-particle effects that emerge in two-dimensional electron systems (2DES) as the result from fundamental quantum interactions. This experimental research is conducted under extreme conditions of temperature and magnetic field. From the materials point of view, the ultra-high mobility systems in GaAs/AlGaAs quantum structures continue to be at the forefront of this research. The newcomer materials are based on graphene, a single atomic layer of graphite. The graphene research is attracting enormous attention from many communities involved in condensed matter research. The investigated many-particle phenomena include the integer and fractional quantum Hall effect, composite fermions, and Dirac fermions, and a diverse group of electron solid and liquid crystal phases. The Stormer group performed magneto-transport experiments and far-infrared spectroscopy, while the Pinczuk group explores manifestations of such phases in optical spectra.

Aron Pinczuk

2009-05-25

390

What constitutes a simple liquid?  

E-print Network

Simple liquids are traditionally defined as many-body systems of classical particles interacting via radially symmetric pair potentials. We suggest that a simple liquid should be defined instead by the property of having strong correlation between virial and potential energy equilibrium fluctuations in the NVT ensemble. There is considerable overlap between the two definitions, but also some notable differences. For instance, in the new definition simplicity is not a property of the intermolecular potential only because a liquid is usually only strongly correlating in part of its phase diagram. Moreover, according to the new definition not all simple liquids are atomic (i.e., with radially symmetric pair potentials) and not all atomic liquids are simple. The main part of the paper motivates the new definition of liquid simplicity by presenting evidence that a liquid is strongly correlating if and only if its intermolecular interactions may be ignored beyond the first coordination shell (FCS). This is demonstrated by NVT simulations of structure and dynamics of 15 atomic and molecular model liquids with a shifted-forces cutoff placed at the first minimum of the radial distribution function. No proof is given that the chemical characterization follows from the strong correlation property, but it is shown to be consistent with the existence of isomorphs in strongly correlating liquids' phase diagram. Finally, we note that the FCS characterization of simple liquids calls into question the basis for standard perturbation theory, according to which the repulsive and attractive forces play fundamentally different roles for the physics of liquids.

Trond S. Ingebrigtsen; Thomas B. Schrøder; Jeppe C. Dyre

2011-11-15

391

Liquid Body Armor  

NSDL National Science Digital Library

In this activity, learners explore how nanotechnology is being used to create new types of protective fabrics. Learners play with samples of âOobleck," a polymer (a long chain of molecules) made of corn starch, food coloring, and water. Oobleck is a non-Newtonian fluid and therefore acts like both a liquid and a solid. Through this activity, learners discover that scientists and engineers are designing new materials to recreate this phenomenon in flexible fabrics.

Network, Nanoscale I.; Houston, Children'S M.

2014-06-18

392

The Liquid Rainbow  

NSDL National Science Digital Library

Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube. Five different solutionsâ3 mixtures of ethyl alcohol, food color and water; red colored water; and pure ethyl alcoholâare used in various combinations. Learners carefully add the solutions to test tubes and observe their relative densities to find the correct order for making a rainbow. Young learners will require adult supervision because of flammable and irritating ingredients.

Sciencenter

2014-08-27

393

Hydrophobic ionic liquids  

Microsoft Academic Search

Ionic liquids having improved properties for application in non-aqueous batteries, electrochemical capacitors, electroplating, catalysis and chemical separations are disclosed. Exemplary compounds have one of the following formulas: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, and R.sub.6 are either H; F; separate alkyl groups of from 1 to 4 carbon atoms, respectively, or joined together to constitute a unitary alkylene radical

Victor R. Koch; Chenniah Nanjundiah; Richard T. Carlin

1998-01-01

394

Olivine-liquid equilibrium  

Microsoft Academic Search

A number of experiments have been conducted in order to study the equilibria between olivine and basaltic liquids and to try and understand the conditions under which olivine will crystallize. These experiments were conducted with several basaltic compositions over a range of temperature (1150–1300° C) and oxygen fugacity (10-0.68–10-12 atm.) at one atmosphere total pressure. The phases in these experimental

P. L. Roeder; R. F. Emslie

1970-01-01

395

Cyclic phosphonium ionic liquids.  

PubMed

Ionic liquids (ILs) incorporating cyclic phosphonium cations are a novel category of materials. We report here on the synthesis and characterization of four new cyclic phosphonium bis(trifluoromethylsulfonyl)amide ILs with aliphatic and aromatic pendant groups. In addition to the syntheses of these novel materials, we report on a comparison of their properties with their ammonium congeners. These exemplars are slightly less conductive and have slightly smaller self-diffusion coefficients than their cyclic ammonium congeners. PMID:24605146

Lall-Ramnarine, Sharon I; Mukhlall, Joshua A; Wishart, James F; Engel, Robert R; Romeo, Alicia R; Gohdo, Masao; Ramati, Sharon; Berman, Marc; Suarez, Sophia N

2014-01-01

396

Basic Liquid Chromatography  

NSDL National Science Digital Library

The online textbook, Basic Liquid Chromatography, is provided by Dr. Yuri Kazakevich and Dr. Harold McNair of Seton Hall University. For those needing review or an introduction to the subject, the well designed and easily read document contains a wealth of information. Sections include an introduction, instrumentation, detectors, theory, adsorbents, reversed phase, gel permeation chromatography, column selection, pH effect, and even an online short course.

Kazakevich, Yuri.; McNair, Harold Monroe, 1933-.

1996-01-01

397

Liquid fuel cells  

PubMed Central

Summary The advantages of liquid fuel cells (LFCs) over conventional hydrogen–oxygen fuel cells include a higher theoretical energy density and efficiency, a more convenient handling of the streams, and enhanced safety. This review focuses on the use of different types of organic fuels as an anode material for LFCs. An overview of the current state of the art and recent trends in the development of LFC and the challenges of their practical implementation are presented.

2014-01-01

398

Living Liquid Crystals  

E-print Network

Collective motion of self-propelled organisms or synthetic particles often termed active fluid has attracted enormous attention in broad scientific community because of it fundamentally non-equilibrium nature. Energy input and interactions among the moving units and the medium lead to complex dynamics. Here we introduce a new class of active matter, living liquid crystals (LLCs) that combine living swimming bacteria with a lyotropic liquid crystal. The physical properties of LLCs can be controlled by the amount of oxygen available to bacteria, by concentration of ingredients, or by temperature. Our studies reveal a wealth of new intriguing dynamic phenomena, caused by the coupling between the activity-triggered flow and long-range orientational order of the medium. Among these are (a) non-linear trajectories of bacterial motion guided by non-uniform director, (b) local melting of the liquid crystal caused by the bacteria-produced shear flows, (c) activity-triggered transition from a non-flowing uniform state into a flowing one-dimensional periodic pattern and its evolution into a turbulent array of topological defects, (d) birefringence-enabled visualization of microflow generated by the nanometers-thick bacterial flagella. Unlike their isotropic counterpart, the LLCs show collective dynamic effects at very low volume fraction of bacteria, on the order of 0.2%. Our work suggests an unorthodox design concept to control and manipulate the dynamic behavior of soft active matter and opens the door for potential biosensing and biomedical applications.

Shuang Zhou; Andrey Sokolov; Oleg D Lavrentovich; Igor S Aranson

2013-12-18

399

Quantum Disentangled Liquids  

E-print Network

We propose and explore a new finite temperature phase of translationally invariant multi-component liquids which we call a "Quantum Disentangled Liquid" (QDL) phase. We contemplate the possibility that in fluids consisting of two (or more) species of indistinguishable quantum particles with a large mass ratio, the light particles might "localize" on the heavy particles. We give a precise, formal definition of this Quantum Disentangled Liquid phase in terms of the finite energy density many-particle wavefunctions. While the heavy particles are fully thermalized, for a typical fixed configuration of the heavy particles, the entanglement entropy of the light particles satisfies an area law; this implies that the light particles have not thermalized. Thus, in a QDL phase, thermal equilibration is incomplete, and the canonical assumptions of statistical mechanics are not fully operative. We explore the possibility of QDL in water, with the light proton degrees of freedom becoming "localized" on the oxygen ions. We do not presently know whether a local, generic Hamiltonian can have eigenstates of the QDL form, and if it can not, then the non-thermal behavior discussed here will exist as an interesting crossover phenomena at time scales that diverge as the ratio of the mass of the heavy to the light species also diverges.

Tarun Grover; Matthew P. A. Fisher

2013-07-08

400

Liquid Crystals in Tribology  

PubMed Central

Two decades ago, the literature dealing with the possible applications of low molar mass liquid crystals, also called monomer liquid crystals (MLCs), only included about 50 references. Today, thousands of papers, conference reports, books or book chapters and patents refer to the study and applications of MLCs as lubricants and lubricant additives and efforts are made to develop new commercial applications. The development of more efficient lubricants is of paramount technological and economic relevance as it is estimated that half the energy consumption is dissipated as friction. MLCs have shown their ability to form ordered boundary layers with good load-carrying capacity and to lower the friction coefficients, wear rates and contact temperature of sliding surfaces, thus contributing to increase the components service life and to save energy. This review includes the use of MLCs in lubrication, and dispersions of MLCs in conventional polymers (PDMLCs). Finally, new lubricating system composed of MLC blends with surfactants, ionic liquids or nanophases are considered. PMID:19865534

Carrion, Francisco-Jose; Martinez-Nicolas, Gines; Iglesias, Patricia; Sanes, Jose; Bermudez, Maria-Dolores

2009-01-01

401

Aging of SRC liquids  

NASA Astrophysics Data System (ADS)

The viscosity of SRC-LL liquid increases when subjected to accelerated aging by bubbling oxygen in the presence of copper strip at 62°C. Precipitates are formed and can be separated from the aged liquid by Soxhlet extraction with pentane. A 30-70 blend of SRC-I with SRC-LL was subjected to oxygen aging in the absence of copper, and the viscosity increased dramatically after 6 days at 62°. The content of preasphaltene and its molecular size increase with time of aging, accompanied by decrease of asphaltene and pentane-soluble contents. For the preasphaltene fraction on aging, gel permeation chromatography shows formation of larger particles. ESR experiments show that with oxygen aging, spin concentration in the preasphaltene fraction decreases. Perhaps some semiquinone, together with di- and tri-substituted phenoxy radicals, generated by oxygen aging of the coal liquid, interact with the free radicals already present in coal to yield larger particles and reduce free radical concentration. We are currently using the very high-field (600-MHz) NMR spectrometer at Mellon Institute to determine changes in structural parameters before and after aging of SRC-II and its chromatographically separated fractions.

Hara, T.; Jones, L.; Tewari, K. C.; Li, N. C.

1981-02-01

402

Comptes Rendus des JNC 17 -Poitiers 2011 Trois approches cohrentes pour modliser la multifissuration des composites  

E-print Network

composites. Nous montrons, dans le cas simplifié du micro-composite, que ces trois approches conduisent à des of a micro-composite. Mots clefs : Composites à Matrice Céramique (CMC), Fissuration, Modélisation, Méthodes multifissuration des composites 1D Three consistent approaches of the multiple cracking process in 1D composites �

Paris-Sud XI, Université de

403

Sur la topologie et l'arithmtique des polynmes Habilitation diriger des recherches  

E-print Network

Sur la topologie et l'arithm�tique des polyn�mes Habilitation � diriger des recherches Arnaud Bodin : application polynomiale Introduction 2 / 34 #12;Topologie et arithm�tique K = C, P : Cn - C Th�or�me (Thom) Il existe BP C fini tel que P : Cn \\ P-1 (BP) - C \\ BP soit une fibration Introduction 3 / 34 #12;Topologie

Bodin, Arnaud

404

Topologie des lignes singulires des smectiques C non chiraux Y. Bouligand  

E-print Network

79 Topologie des lignes singulières des smectiques C non chiraux Y. Bouligand Laboratoire d moléculaires auront fondamentale- ment la même topologie qu'il y ait ou non torsion. Ainsi, il est commode de

Paris-Sud XI, Université de

405

EXTRACTION DE CONNAISSANCES PARTIR DES DONNEES ET DES TEXTES (ECD ET ECT "DATA & TEXT MINING")  

E-print Network

1 EXTRACTION DE CONNAISSANCES � PARTIR DES DONNEES ET DES TEXTES (ECD ET ECT "DATA & TEXT MINING'Extraction de Connaissances à partir de Textes (ECT, "Text Mining") comme un descendant direct de l'Extraction de Connaissances à partir de Données (ECD, "Data Mining"). Le point fondamental qui distingue ces

Spagnolo, Filippo

406

Analysis of the DES and Its Implications for the Design of an Extended DES 1  

Microsoft Academic Search

The Data Encryption standard (DES) has achieve dw ide utilization, especially in the financial industry .W hilst DES is a standard, the design criteria used in its de velopment have b een classified by the US go vernment. This paper reviews what is known about the design criteria for the S-boxes, P-box es, and key s cheduling in the current

Lawrence Brown

407

Polythiophènes substitués par des motifs tétrathiafulvalènes : vers des matériaux électroactifs à conductivité mixte  

NASA Astrophysics Data System (ADS)

Highly electroactive conjugated polymers have been synthesized by electropolymerisation of tetrathiafulvalene-derivatised bithiophenes. We report and discuss the electrochemical and optical properties of these new polymers. Des polymères conjugués fortement électroactifs ont été synthétisés par électropolymérisation de bithiophènes dérivés du tétrathiafulvalène. Nous présentons et discutons des caractéristiques électrochimiques et optiques de ces nouveaux polymères.

Huchet, L.; Roncali, J.

1998-06-01

408

CONTRIBUTION A L'TUDE ANTIGNIQUE DES VIRUS INFLUENZA DES ANIMAUX  

E-print Network

an additional information for studying and checking the efficiency of equine influenza vaccines. KeyCONTRIBUTION A L'Ã?TUDE ANTIGÃ?NIQUE DES VIRUS INFLUENZA DES ANIMAUX II. - ANTICORPS ANTI STUDY OF INFLUENZA VIRUSUS IN ANIMALS. II. - ANTIBODIES, ANTINUURAMINIDASE IN HORS! :I CONDITIONS

Boyer, Edmond

409

Engagement au respect des rgles dans les laboratoires du Dpartement des sciences animales  

E-print Network

sciences animales Reconnaissant l'importance du respect des règles pour assurer animales; - respecter les règles mises en place dans les laboratoires du Département des sciences animales; - assister à la première rencontre annuelle

Laval, Université

410

Madame, Monsieur, L'organisation "European Youth Press" organise des ateliers pour des jeunes journalistes (ou  

E-print Network

. ______________________________ european youth press - network of young media makers Square de Meeus 25 B-1000 Brussels Belgium httpMadame, Monsieur, L'organisation "European Youth Press" organise des ateliers pour des jeunes journalistes (ou étudiants en journalisme), dans le cadre du "European Youth Event" qui rassemblera 5

Herrmann, Samuel

411

FRQUENCE DES PILI FY ET K99 PARMI DES SOUCHES DE ESCHERICHIA COLI  

E-print Network

FRÃ?QUENCE DES PILI FY ET K99 PARMI DES SOUCHES DE ESCHERICHIA COLI ISOLÃ?ES DE VEAUX DIARRHÃ?IQUES EN IN FRANCE. - Epidemiological study of bovine E. coli shows that the FY E. coli pilus which has previously, eight of them carrying both FY and K99 pili. The K99 E. coli pilus is present in 86 fecal samples

Boyer, Edmond

412

Evolution structurale et nature des liaisons de quelques composés polyanioniques des systèmes IIB-V-VII  

NASA Astrophysics Data System (ADS)

The structural data for known cadmium and mercury polyanionic compounds are reported and classified with respect to the coordination of these atoms with elements of group V. These data are discussed according to the particular characteristics of elements IIB as well as the size of associated halogens. The character of IIB-V, V-V, and IIB-VII bonds in these compounds is also analyzed. Les données structurales des composés polyanioniques connus du cadmium et du mercure sont rassemblées d'aprés les motifs de coordination présentés par ces atomes vis à vis des éléments V. Ces données sont discutées en fonction des caractéristiques propres des éléments IIB ainsi qu'en fonction de la dimension de l'halogène associé. Le caractère des liaisons IIB-V, V-V, et IIB-VII présentes dans ces composés est également analysé.

Rebbah, H.; Rebbah, A.

1994-11-01

413

Developpement des betons semi autoplacants a rheologie adaptee pour des infrastructures  

NASA Astrophysics Data System (ADS)

Au cours des dernières décennies, les infrastructures canadiennes et québécoises comportent plusieurs structures en béton armé présentant des problèmes de durabilité dus aux conditions climatiques sévères, à la mauvaise conception des structures, à la qualité des matériaux, aux types des bétons choisis, aux systèmes de construction ou à l'existence d'événements incontrôlables. En ce qui concerne le choix du béton pour la construction des infrastructures, une vaste gamme de béton divisée en deux principaux types peut être utilisée: le béton conventionnel vibré (BCV) et le béton autoplaçant (BAP). Dans le cas d'un BCV, la consolidation inadéquate par vibration a été un problème récurrent, occasionnant des dommages structuraux. Ceci a conduit à une réduction de la durabilité et à une augmentation du coût d'entretien et de réparation des infrastructures. Rien que l'utilisation d'un BAP a des avantages tels que l'élimination de la vibration, la réduction des coûts de main d'oeuvre et l'amélioration de la qualité des structures, néanmoins, le coût initial d'un BAP par rapport à un BCV ne permet pas encore de généraliser son utilisation dans l'industrie de la construction. Ce mémoire présente la conception d'une nouvelle gamme de béton semi-autoplaçant pour la construction des infrastructures (BSAP-I) exigeant une vibration minimale. Il s'agit de trouver un équilibre optimal entre la rhéologie et le coût initial du nouveau béton pour conférer une bonne performance structurale et économique aux structures. Le programme expérimental établi a premièrement permis d'évaluer la faisabilité d'utilisation des BSAP-I pour la mise en place des piliers d'une infrastructure de pont à Sherbrooke. En plus, l'utilisation d'un plan d'expériences a permis l'évaluation de trois paramètres de formulation sur les propriétés des mélanges de BSAP-I à l'état frais et durci. Finalement, l'évaluation de la performance des BSAP-I optimisés à travers une caractérisation complète des propriétés mécaniques et de la durabilité a été réalisée. A la suite de cette étude, les résultats obtenus nous permettent de conclure que : (1) L'utilisation d'un BSAP-I avec un gros granulat de 5 - 14 mm, des rapports E/L = 0,37 et S/G = 0,52 et une teneur en air de 6 à 9% a été possible en conférant un équilibre optimal fluidité / stabilité à l'état frais, ainsi qu'un niveau de thixotropie adéquate au chantier permettant d'optimiser la conception du coffrage des piliers de pont et de conférer des qualités de surfaces très acceptables de ces infrastructures. (2) La méthode adaptée pour l'essai L-Box contenant 2 barres et une vibration de 5 secondes a permis de bien caractériser la capacité de remplissage d'un BSAP-I. (3) L'utilisation d'un plan factoriel 23 a permis d'obtenir des modèles statistiques fiables, capables de prédire les propriétés rhéologiques à l'état frais et les résistances en compression des BSAP-I avec des dosages en liant entre 370 et 420 kg/m3, des rapports E/L entre 0,34 et 0,40 et S/G entre 0,47 et 0,53. (4) Des mesures de vitesse d'écoulement T40 d'un BSAP-I sont très semblables à celles d'un BAP. En plus, des valeurs T40 montrent une bonne corrélation linéaire avec celles de T400 mesurés dans la boîte L-Box. (5) À la frontière du BAP et du BCV, une bande rhéologique possédant un ?0 entre 30 et 320 Pa et un ? entre 10 et 140 Pa.s a été trouvée pour la conception optimale des BSAP-I. (6) Les BSAP-I optimisés ont également conféré une très bonne performance à l'état frais, en permettant maintenir un bon équilibre entre la rhéologie et la stabilité dans le temps, lorsqu'on utilise une énergie de vibration minimale pour amorcer son écoulement. (7) À l'état durci Les BSAP-I ont conféré une bonne performance présentant des résistances mécaniques élevées et des niveaux négligeables de pénétration aux ions chlores, de perte de masse par écaillage et des attaques par le gel/dégel. (8) L'utilisation des cim

Sotomayor Cruz, Cristian Daniel

414

Liquid nitrogen is very, very cold! (liquid nitrogen demonstration)  

NSDL National Science Digital Library

In this YouTube video, chemistry teacher Aaron Keller demonstrates the amazing properties of liquid nitrogen. He explains each demonstration in an understandable way. The temperature of liquid nitrogen is -196C (-321F). He explains how a dewar flask works. He pulls balloons out of a cooler, showing the expansion of a gas as it warms. He demonstrates the explosive power of the expansion of liquid nitrogen in an enclosed container. Liquid nitrogen is so cold that the floor is like a hot griddle. Liquid nitrogen has a very low viscosity. He demonstrates how brittle a flower becomes when frozen in a liquid nitrogen bath. Finally, he shows how to shatter a racquetball. As a bonus he shows how nitrogen gas can be used to put out a candle flame.

415

A Novel Liquid-Liquid Transition in Undercooled Ti-Zr-Ni Liquids  

NASA Technical Reports Server (NTRS)

If crystallization can be avoided, liquids enter a metastable (undercooled) state below their equilibrium liquidus temperatures, T(sub l), finally 'freezing' into a glass below a characteristic temperature called the glass transition temperature, T(sub g). In rare cases, the undercooled liquid may undergo a liquid-liquid phase transition (liquid polymorphism) before entering the glassy state. This has been suggested from experimental studies of H2O and Si. Such phase transitions have been predicted in some stable liquids, ie. above T(sub l) at atmospheric pressure, for SiO2 and BeF2, but these have not been verified experimentally. They have been observed in liquids of P, Si and C, but only under high pressure. In this letter we present the first experimental evidence for a phase transition in a low viscosity metallic liquid that is driven by an approach to a constant entropy configuration state and correlated with a growing icosahedral order in the liquid. A maximum in the specific heat at constant pressure, similar to what is normally observed near T(sub g), is reported for undercooled liquids of quasicrystal-forming Ti-Zr-Ni alloys. A two-state excitation model that includes cooperativity by incorporating a temperature-dependent excitation energy, fits the specific heat data well, signaling a phase transition. An inflection in the liquid density with decreasing temperature instead of a discontinuity indicates that this is not a typical first order phase transition; it could be a weakly first order or higher order transition. While showing many similarities to a glass transition, this liquid-liquid phase transition occurs in a mobile liquid, making it novel.

Lee, G. W.; Gangopadhyay, A. K.; Kelton, K. F.; Bradshaw, R. C.; Hyers, R. W.; Rathz, T. J.; Rogers, J. R.

2004-01-01

416

Liquid-jet impact on liquid and solid surfaces  

Microsoft Academic Search

Experiments were conducted to investigate the mechanisms of the liquid-jet impact on liquid and solid surfaces associated with cavitation damage and rain erosion. In this work, a liquid jet of 3 mm diameter, generated using a single impact jet apparatus, was impacted at ca. 600 m s?1 on the surface of water and polymethyl-methacrylate (PMMA) placed 15 mm below the

T. Obara; N. K. Bourne; J. E. Field

1995-01-01

417

Liquid-Liquid Critical Point in Heavy Water  

Microsoft Academic Search

According to the liquid-liquid critical-point hypothesis about water, two liquid waters exist at low temperatures and are supposed to be merged at a critical point. The low-temperature metastable melting curves of D2O ices have been measured. It is found that the melting curve of D2O ice III is smoothly curved around 25 MPa and 238 K, whereas the melting curve

Osamu Mishima

2000-01-01

418

Liquid class predictor for liquid handling of complex mixtures  

DOEpatents

A method of establishing liquid classes of complex mixtures for liquid handling equipment. The mixtures are composed of components and the equipment has equipment parameters. The first step comprises preparing a response curve for the components. The next step comprises using the response curve to prepare a response indicator for the mixtures. The next step comprises deriving a model that relates the components and the mixtures to establish the liquid classes.

Seglke, Brent W. (San Ramon, CA); Lekin, Timothy P. (Livermore, CA)

2008-12-09

419

INSTITUT DES SCIENCES ET TECHNOLOGIES cole doctorale n  

E-print Network

'adoucissement cyclique des aciers ferritiques-martensitiques revenus Experimental study and simulation of cyclic aciers martensitiques revenus `a 9 % de chrome. Actuellement utilis´es pour des applications `a haute

420

Éléments d'écologie de la transmission d'Echinococcus multilocularis en Chine (Sichuan) Modélisation des distributions spatiales des communautés et populations des hôtes : des données de terrain aux prédictions.  

E-print Network

??La transmission du parasite Echinococcus multilocularis à l'origine d'une zoonose fatale chez l'homme, l'échinococcose alvéolaire, peut être modulée par des perturbations anthropiques de l'écologie des… (more)

Vaniscotte, Amélie

2009-01-01

421

Die Empfindlichkeit des diphtherietoxingeschädigten Katzenherzens gegen Digitoxin und Strophanthin  

Microsoft Academic Search

Zusammenfassung 1.Die Digitoxinempfindlichkeit des diphtherietoxingeschädigten Katzenherzens ist (am ganzen Tier) um 83% heraufgesetzt.2.Die Quabainempfindlichkeit des diphtherietoxingeschädigten Katzenherzens ist am ganzen Tier um 64%, im HLP. um 74% heraufgesetzt.

Josef Dieckhoff; Ernst Schulze

1936-01-01

422

Universit des Sciences et Technologies de Lille Thse de doctorat  

E-print Network

des N- glycannes dans des cellules Sf9. L'utilisation d'inhibiteurs de la maturation ou du trafic to "humanize" the glycoproteins produced in Lepidopteran cells. Our first concern was to understand the N

Paris-Sud XI, Université de

423

Modlisation du transfert des nitrates couple avec une analyse socioconomique afin de donner les outils pour la gestion des eaux souterraines. Application la nappe alluviale de  

E-print Network

outils pour la gestion des eaux souterraines. Application à la nappe alluviale de la plaine de l hydrogéochimique des eaux et la modélisation du transfert des nitrates dans la nappe et ii) une approche en 2009. Le modèle BICHE de transfert des nitrates des sols vers la nappe au travers

Paris-Sud XI, Université de

424

Une porte optique intensificatrice picoseconde a gain eleve: Caracterisation et application potentielle en imagerie de petits objets places dans des milieux diffusants  

NASA Astrophysics Data System (ADS)

Dans cette etude, nous avons developpe un amplificateur a colorant possedant ces deux caracteristiques. Le colorant choisi, l'iodure de 3,3'-dimethyloxatricarbocyanine (methyl-DOTCI), possede un epaulement dans la bande d'absorption a 620 nm ce qui convient bien a notre pompe femtoseconde. De plus, son maximum de fluorescence est a 720 nm ce qui est particulierement interessant dans le cas des etudes avec des tissus biologiques humains. En effet, la fenetre dite "therapeutique" se situe dans les longueurs d'onde rouge et proche infrarouge. Le phenomene d'amplification, qui se produit dans des conditions experimentales precises, est en fait une emission stimulee du colorant qui est largement favorisee par rapport a sa fluorescence naturelle (emission spontanee). L'arrivee du signal incident, dont la longueur d'onde correspond au saut energetique entre l'etat fondamental et l'etat excite ou se trouvent les molecules, provoque une avalanche coherente de celles-ci vers l'etat fondamental generant ainsi l'emission stimulee. Une des conditions necessaires pour l'obtention d'un gain eleve est que la duree de l'impulsion de pompe soit inferieure au temps de relaxation des molecules ainsi qu'inferieure au temps requis pour effectuer un trajet dans la cellule de colorant. Ceci nous a permis d'amplifier un signal incident par un facteur entre 103 et 104. De plus, ce gain eleve n'est observe qu'a l'interieur d'une fenetre temporelle d'environ 10 picosecondes. Nous avons integre cet amplificateur a notre montage de transillumination afin d'acquerir des images d'un patron de lignes opaques immerge dans un milieu diffusant liquide. Des images de lignes ayant une resolution spatiale de 200 mum ont ete obtenues. La cible etait placee au centre d'un melange contenant des proportions variables de lait et d'eau. Deux longueurs de trajet optique dans la solution ont ete utilisees: 30 et 50 mm. Pour determiner les proprietes optiques de notre milieu diffusant, nous avons mis au point une technique de caracterisation basee sur la distribution radiale des photons transmis a travers le milieu. Deux parametres de transport, les coefficients de diffusion effectif (mus') et d'absorption (mu a), caracterisent la forme et l'amplitude du profil radial. Le fit des courbes experimentales a des courbes simulees nous a permis d'extraire ces coefficients. Les courbes simulees ont ete realisees grace a une simulation Monte Carlo qui incorpore les conditions experimentales de notre montage de caracterisation. (Abstract shortened by UMI.)

Marengo, Stephanie

425

L'ALLOCATION DES RISQUES DANS LES CONTRATS  

Microsoft Academic Search

L'allocation des risques inhérents à l'exécution d'obligations dans des accords dont la temporalité est longue est une question importante, notamment pour l'économie. Or, à cet égard, il est significatif de constater que les entrées consacrées au droit administratif dans l'Encyclopedia of Law and Economics ne font pas mention des contrats administratifs, et que les entrées relatives au droit des contrats

Thierry Kirat

2003-01-01

426

THE TUNIS STOCK EXCHANGE \\/ LA BOURSE DES VALEURS DE TUNIS  

Microsoft Academic Search

L'article concerne la Bourse tunisienne et la première partie comprend une analyse de la période précédant la création de la Bourse des valeurs et notamment des institutions — les chambres de compensation et l'Office Tunisien de Cotation des valeurs mobilières — dont la tâche était de faciliter la négociation des valeurs mobilières à l'époque coloniale. Après avoir tracé l'histoire de

Andrea Calamanti

1979-01-01

427

Contraintes financières et demande d'investissements des entreprises  

Microsoft Academic Search

[fre] Contraintes financières et demande d'investissement des entreprises. . L'objectif principal de cette recherche est d'ordre empirique : il s'agit pour l'essentiel de s'intéresser à la détermination de l'investissement des entreprises, en insistant sur l'étude du rôle des variables financières. Parmi ces variables issues des théories financières de la firme on relève : le coût du capital qui intègre l'effet

Jean-François Malécot; Jacques Hamon

1986-01-01

428

Politique des déchets : l'approche du Royaume-Uni  

Microsoft Academic Search

[fre] Politique des déchets : l'approche du Royaume-Uni . L'évolution récente de la réglementation européenne en dématière de déchets risque d'entraîner des coûts importants pour les États membres. L'exemple britannique est d'autant plus intéressant pour la France que les deux pays présentent des similitudes : quantité presque identique de déchets ménagers (environ 20 millions de tonnes), faible capacité des incinérateurs

David Litvan

1995-01-01

429

UNIVERSIT DE SHERBROOKE FACULT DES SCIENCES Nom : B. Sc. physique  

E-print Network

UNIVERSIT� DE SHERBROOKE ­ FACULT� DES SCIENCES Nom : B. Sc. physique Programmation des cours2 Hiver T0 �T� S3 Automne T1 HIV S4 �té T2 AUT S5 Hiver T3 �T� S6 Automne Ob Op Ch Informatique SHERBROOKE ­ FACULT� DES SCIENCES Nom : B. Sc. physique Programmation des cours ­ coop ­ version 2 224 500

Spino, Claude

430

Water: The Strangest Liquid  

SciTech Connect

Water, H2O, is familiar to everyone - it shapes our bodies and our planet. But despite its abundance, water has remained a mystery, exhibiting many strange properties that are still not understood. Why does the liquid have an unusually large capacity to store heat? And why is it denser than ice? Now, using the intense X-ray beams from particle accelerators, investigations into water are leading to fundamental discoveries about the structure and arrangement of water molecules. This lecture will elucidate the many mysteries of water and discuss current studies that are revolutionizing the way we see and understand one of the most fundamental substances of life.

Nilsson, Anders

2009-02-24

431

Nanorheology of Liquid Alkanes  

SciTech Connect

We report molecular dynamics simulations of liquid alkanes, squalane and tetracosane, confined between moving walls to which butane chains are tethered, effectively screening the details of the wall. As in an experiment, heat is removed by thermostatting the tethered molecules. Results obtained at high strain rates, typical of practical applications, suggest little or no difference between the bulk rheology and confined flow, and the occurrence of a high degree of slip at the wall-fluid interface at the conditions studied. At relatively low velocities and high densities, tetracosane shows the formation of fully-extended chains at certain wall spacings.

Gupta, S.A., Cochran, H.D., Cummings, P.T. [Tennessee Univ., Knoxville, TN (United States). Dept. of Chemical Engineering], [Oak Ridge National Lab., TN (United States)

1997-09-01

432

High Performance Liquid Chromatography  

NSDL National Science Digital Library

The North Carolina Community College System BioNetwork's interactive eLearning tools (IETs) are reusable chunks of training that can be deployed in a variety of courses or training programs. IETs are designed to enhance, not replace hands-on training. Learners are able to enter a hands-on lab experience better prepared and more confident. This particular IET delves into High Performance Liquid Chromatography (HPLC) and its application in discovering the amount of caffeine in two different drinks. Flash is required to participate in this learning module.

2013-08-06

433

Vaporization of kitaev spin liquids.  

PubMed

The quantum spin liquid is an exotic quantum state of matter in magnets. This state is a spin analog of liquid helium that does not solidify down to the lowest temperature due to strong quantum fluctuations. In conventional fluids, the liquid and gas possess the same symmetry and adiabatically connect to each other by bypassing the critical end point. We find that the situation is qualitatively different in quantum spin liquids realized in a three-dimensional Kitaev model; both gapless and gapped quantum spin liquid phases at low temperatures are always distinguished from the high-temperature paramagnet (spin gas) by a phase transition. The results challenge the common belief that the absence of thermodynamic singularity down to the lowest temperature is a symptom of a quantum spin liquid. PMID:25415923

Nasu, Joji; Udagawa, Masafumi; Motome, Yukitoshi

2014-11-01

434

Making a Liquid Crystal Thermometer  

NSDL National Science Digital Library

This lab, presented by the National Nanotechnology Infrastructure Network, introduces students to the temperature response of liquid crystals, and how they respond in different phases of matter. In addition to liquid, solid, and gas, the fourth phase of matter includes liquid crystals which  " have the particles arranged in a helix, and the color reflected from the liquid crystal depends on the pitch of tightness of the helix. The pitch , which changes with temperature, equals the wavelength of the light reflected which creates the color of the liquid." This can be found in nature, and is also in digital displays. In this lab, students will examine the changes in liquid crystal color and behavior when heat is applied. Included in this lab are: teacher preparation guide, student guide, and a student guide with answers.

2014-08-08

435

Positionsbestimmung des Unternehmens: Interne und externe Analyse  

NASA Astrophysics Data System (ADS)

Die Initiierung und Lenkung von Maßnahmen zur integrierten Modernisierung zielen auf die Verbesserung der Wettbewerbsfähigkeit eines Unternehmens ab. Damit diese Maßnahmen zielgerichtet die Wettbewerbsfähigkeit verbessern können, ist Wissen über die bestehende Wettbewerbsfähigkeit sowie über die bestehenden Fähigkeiten eine zentrale Voraussetzung. Eine zielgerichtete Auswahl problemadäquater Maßnahmen zur Verbesserung der Wettbewerbsfähigkeit bedarf daher im Vorfeld einer Bewertung der aktuellen Situation des Unternehmens im Sinne einer Positionsbestimmung. Erst wenn die internen Stärken und Schwächen sowie die externen Chancen und Risiken identifiziert sind, kann ein ganzheitliches Bild von der Position eines Unternehmens in seiner Umwelt gewonnen werden. Auf Basis der Kenntnisse über die Position des Unternehmens können anschließend zielgerichtet Maßnahmen ausgewählt werden, die einen Beitrag zur Verbesserung der Wettbewerbsfähigkeit des Unternehmens haben. Damit kommt der Positionsbestimmung als initialer Schritt des Prozesses der strategischen Unternehmensplanung eine zentrale Bedeutung im Rahmen der integrierten Modernisierung zu. Erfolgt die Auswahl von Maßnahmen ohne eine vorherige Positionsbestimmung, also lediglich auf Basis drängender Probleme, so besteht die Gefahr einer unbedachten und nur auf das "hier und heute“ bezogenen Schwerpunktbildung ohne Berücksichtigung der mittel- und langfristigen Ziele des Unternehmens.

Bergmann, Lars; Crespo, Isabel; Portmann, Stefan

436

Micro-liquid flow sensor  

Microsoft Academic Search

A simple to realise micro-liquid flow sensor with high sensitivity is presented. The sensor is based on well known thermal anemometer principles. An analytical model for the sensor behaviour applicable for gas\\/liquid fluids is presented. The realisation process of the sensor is described. Model and experimental results agree well. The sensor is simple to integrate with other micro-liquid handling components

Theo S. J. Lammerink; Niels R. Tas; Miko Elwenspoek; Jan H. J. Fluitman

1993-01-01

437

Life's Little Essential: Liquid Water  

NSDL National Science Digital Library

Without liquid water, terrestrial life could not exist. All living organisms on Earth depend on water and its unique chemical and physical properties. In the search for life beyond Earth, scientists have focused their efforts on looking for signs of liquid water. This essay discusses the properties of liquid water that are conducive to life, pointing out that the biochemical reactions that sustain life need a fluid in order to operate, and that water is probably the best solvent in the universe.

2011-04-15

438

Supported liquid membrane electrochemical separators  

DOEpatents

Supported liquid membrane separators improve the flexibility, efficiency and service life of electrochemical cells for a variety of applications. In the field of electrochemical storage, an alkaline secondary battery with improved service life is described in which a supported liquid membrane is interposed between the positive and negative electrodes. The supported liquid membranes of this invention can be used in energy production and storage systems, electrosynthesis systems, and in systems for the electrowinning and electrorefining of metals.

Pemsler, J. Paul (Lexington, MA); Dempsey, Michael D. (Revere, MA)

1986-01-01

439

Liquid Rocket Engine Testing Overview  

NASA Technical Reports Server (NTRS)

Contents include the following: Objectives and motivation for testing. Technology, Research and Development Test and Evaluation (RDT&E), evolutionary. Representative Liquid Rocket Engine (LRE) test compaigns. Apollo, shuttle, Expandable Launch Vehicles (ELV) propulsion. Overview of test facilities for liquid rocket engines. Boost, upper stage (sea-level and altitude). Statistics (historical) of Liquid Rocket Engine Testing. LOX/LH, LOX/RP, other development. Test project enablers: engineering tools, operations, processes, infrastructure.

Rahman, Shamim

2005-01-01

440

TOPOLOGIE DES VARITS ALGBRIQUES RELLES DE DIMENSION 3  

E-print Network

TOPOLOGIE DES VARI�T�S ALG�BRIQUES R�ELLES DE DIMENSION 3 par Frédéric Mangolte Table des matières variétés algébriques. . . . . . . . . . . . . . . . . . . . . . . . . 31 Topologie des éclatements

Paris-Sud XI, Université de

441

La théorie des négociations salariales : une revue de la littérature  

Microsoft Academic Search

[fre] La théorie des négociations salariales : Une revue de la littérature, . par Pierre Cahuc.. . Cet article expose les récents développements de la théorie des négociations salariales, qui explique la détermination du salaire et de l'emploi en prenant en considération les interactions stratégiques entre salariés et entreprises. Il montre que malgré les insuffisances de la microéconomie des négociations,

Pierre Cahuc

1990-01-01

442

QUELQUES NOUVEAUX PROBLMES THORIQUES RENCONTRS DANS LA DFORMATION DES OXYDES  

E-print Network

919 QUELQUES NOUVEAUX PROBL�MES TH�ORIQUES RENCONTR�S DANS LA D�FORMATION DES OXYDES B. ESCAIG les effets principaux qui déterminent le caractère particulier de la déformation plastique des oxydes, Classification : Physics Abstracts 16.40, 16.60 Introduction. - La déformation plastique des oxydes est

Boyer, Edmond

443

Prospective des espaces ruraux français à l'horizon 2020  

Microsoft Academic Search

Vu la diversité de leurs usages et fonctions, la physionomie future des campagnes françaises peut revêtir des aspects très contrastés. S'appuyant sur une synthèse et une relecture des connaissances acquises sur les espaces ruraux, le groupe de prospective constitué à la Datar sur ce thème propose quatre scénarios possibles pour les campagnes françaises à l'horizon 2020.

Philippe Perrier-Cornet; Christophe Soulard

2003-01-01

444

Optimisation des relations entre transpiration et photosynthse. Observations propos  

E-print Network

Optimisation des relations entre transpiration et photosynthèse. Observations à propos des 1977 une théorie d'optimisation des relations entre transpiration et photosynthèse chez les végétaux transpiration, F! le taux de photosynthèse nette et g, la conductance stomatiquc pour le CO2. Les études

Paris-Sud XI, Université de

445

La mmoire du voyage : souvenirs et objets des destinations touristiques  

E-print Network

La mémoire du voyage : souvenirs et objets des destinations touristiques ­ APPEL � TEXTES Rédacteur, elle, relève de motivations ancrées dans la culture commune des voyageurs. Or, voyager c'est se voyage, 1991). C'est à l'étude des rapports entre le souvenir et les destinations touristiques que se

Pouliot, Jacynthe

446

0. Informationen zur Vorlesung 0-1 Grundlagen des  

E-print Network

. Stefan Brass Institut f¨ur Informatik ¨Ubungen: Dr. Henning Thielemann Stefan Brass: Grundlagen des World) · Suchmaschinen (kurz) Stefan Brass: Grundlagen des World Wide Web Universit¨at Halle, 2010 #12;0. Informationen Brass: Grundlagen des World Wide Web Universit¨at Halle, 2010 #12;0. Informationen zur Vorlesung 0

Brass, Stefan

447

0. Informationen zur Vorlesung 0-1 Grundlagen des  

E-print Network

. Stefan Brass Institut f¨ur Informatik ¨Ubungen: Dr. Henning Thielemann Stefan Brass: Grundlagen des World) · Suchmaschinen (kurz) Stefan Brass: Grundlagen des World Wide Web Universit¨at Halle, 2009 #12;0. Informationen Brass: Grundlagen des World Wide Web Universit¨at Halle, 2009 #12;0. Informationen zur Vorlesung 0

Brass, Stefan

448

COVENANTS, SOFT LAW ET AUDIT: L'ADOPTION DES NORMES  

E-print Network

1 COVENANTS, SOFT LAW ET AUDIT: L'ADOPTION DES NORMES INTERNATIONALES PAR DEUX ENTREPRISES besoins de financement ont déclenché l'adoption, des pressions normatives, imminence de la septième constitue le catalyseur de l'adoption, le choix effectif des normes de référence traduit une mise en

Paris-Sud XI, Université de

449

PROGRAMME DE MATRISE DES NERGIES DANGEREUSES ET DE  

E-print Network

PROGRAMME DE MAÃ?TRISE DES Ã?NERGIES DANGEREUSES ET DE CADENASSAGE Programme: Version: 01 Publication originale : Page: 1 de 29 Page 1 de 29 PROGRAMME DE MAÃ?TRISE DES Ã?NERGIES DANGEREUSES ET DE CADENASSAGE Polytechnique #12;PROGRAMME DE MAÃ?TRISE DES Ã?NERGIES DANGEREUSES ET DE CADENASSAGE Programme: Version: 01

Skorobogatiy, Maksim

450

AVIS DE POSTE VACANT DIRECTION DES RESSOURCES HUMAINES  

E-print Network

-14-03-02 Titre du poste : Analyste en informatique Secteur de travail : Faculté des Arts et des Sciences (FAS) Département d'informatique et de recherche opérationnelle (DIRO) �chelle de salaire : R2 au projet de recherche. Habiletés ou expertises requises : Maîtrise des languages de programmation

Charette, André

451

Electron Bubbles in Liquid Helium  

E-print Network

When an electron (or positronium atom) is injected into liquid helium with nearly zero energy, a bubble quickly forms around it. This phenomenon (which also occurs in liquid hydrogen, liquid neon and possibly in solid helium) lowers the mobility of the electron to a value similar to that for a positive ion. We estimate the radius of the bubble at zero pressure and temperature based on the zero point energy of the electron. If the liquid is held in a state of negative pressure, the bubble will expand beyond the radius at zero pressure. We also estimate the negative pressure such that a bubble once formed will grow without limit.

Kirk T. McDonald

2003-12-03

452

Vapor-liquid contacting system  

SciTech Connect

A vapor-liquid contacting tray is described wherein a perforated portion of the tray member forms an active surface area for vapor-liquid contact in the interior of the tray member. The active surface area portion of the tray member is circumscribed by an imperforate peripheral portion of the tray member with a width of from 0.05 to 0.35 times the radius of the tray. The disclosed tray provides upwardly directed laminar jetting of liquid over the tray perforation openings for high selectivity vapor-liquid contacting and has particular utility in the absorption of hydrogen sulfide from a gas mixture containing hydrogen sulfide and carbon dioxide.

Butwell, K.F.; Sigmund, P.W.

1981-10-27

453

Wicking of liquids in screens  

NASA Technical Reports Server (NTRS)

An investigation was conducted to determine the magnitude of the wicking rates of liquids in various screens. Evaluation of the parameters characterizing the wicking process resulted in the development of an expression which defined the wicking velocity in terms of screen and system geometry, liquid properties, and gravitational effects. Experiment data obtained both in normal gravity and in weightlessness demonstrated that the model successfully predicted the functional relation of the liquid properties and the distance from the liquid source to the wicking velocity. Because the pore geometry in the screens was complex, several screen geometric parameters were lumped into a single constant which was determined experimentally for each screen.

Symons, E. P.

1974-01-01

454

HPLC- High Performance Liquid Chromatography  

NSDL National Science Digital Library

This primer on High Performance Liquid Chromatography (HCLC) gives a brief history and definition of liquid chromatography (LC), LC techniques, and defines both HPLC and UltraPerformance Liquid Chromatography (UPLC Technology). The other chapters of the primer are available on the left side of the page: How Does High Performance Liquid Chromatography Work?, Identifying and Quantitating Compounds, HPLC Column Hardware, and HPLC Separation Modes. An appendix which defines HPLC nomenclature is also available. Each section is pepper with helpful and clear illustrations to help users visualize the processes and procedures presented.

2011-05-19

455

Performance of the dark energy camera liquid nitrogen cooling system  

NASA Astrophysics Data System (ADS)

The Dark Energy Camera, the Imager and its cooling system was installed onto the Blanco 4m telescope at the Cerro Tololo Inter-American Observatory in Chile in September 2012. The imager cooling system is a LN2 two-phase closed loop cryogenic cooling system. The cryogenic circulation processing is located off the telescope. Liquid nitrogen vacuum jacketed transfer lines are run up the outside of the telescope truss tubes to the imager inside the prime focus cage. The design of the cooling system along with commissioning experiences and initial cooling system performance is described. The LN2 cooling system with the DES imager was initially operated at Fermilab for testing, then shipped and tested in the Blanco Coudé room. Now the imager is operating inside the prime focus cage. It is shown that the cooling performance sufficiently cools the imager in a closed loop mode, which can operate for extended time periods without maintenance or LN2 fills.

Cease, H.; Alvarez, M.; Alvarez, R.; Bonati, M.; Derylo, G.; Estrada, J.; Flaugher, B.; Flores, R.; Lathrop, A.; Munoz, F.; Schmidt, R.; Schmitt, R. L.; Schultz, K.; Kuhlmann, S.; Zhao, A.

2014-01-01

456

Flame Spread Across Liquids  

NASA Technical Reports Server (NTRS)

The principal goal of our recent research on flame spread across liquid pools is the detailed identification of the mechanisms that control the rate and nature of flame spread when the liquid pool is initially at an isothermal bulk temperature that is below the fuel's flash point temperature. In our project, we specialize the subject to highlight the roles of buoyancy-related processes regarding the mechanisms of flame spread, an area of research cited recently by Linan and Williams as one that needs further attention and which microgravity (micro-g) experiments could help to resolve. Toward resolving the effects of buoyancy on this flame spread problem, comparisons - between 1-g and micro-g experimental observations, and between model predictions and experimental data at each of these gravitational levels - are extensively utilized. The present experimental and computational foundation is presented to support identification of the mechanisms that control flame spread in the pulsating flame spread regime for which long-duration, micro-g flame spread experiments have been conducted aboard a sounding rocket.

Ross, Howard D.; Miller, Fletcher J.; Sirignano, William A.; Schiller, David

1997-01-01

457

Modlisation individuelle de la reproduction des vaches Holstein intgrant les effets de la production laitire et des rserves corporelles  

E-print Network

Modélisation individuelle de la reproduction des vaches Holstein intégrant les effets de la R�SUM� - La reproduction est un élément déterminant de la productivité et de la démographie des troupeaux. La dégradation des performances de reproduction au cours des dernières décennies a réduit la

Paris-Sud XI, Université de

458

LA REVUE DE L'EPI N 94 UTILISATION DES NTIC ET DMARCHE HUMANISTE UTILISATION DES NTIC ET  

E-print Network

91 LA REVUE DE L'EPI N° 94 UTILISATION DES NTIC ET D�MARCHE HUMANISTE UTILISATION DES NTIC ET D�MARCHE HUMANISTE OBSERVATIONS ET SUGGESTIONS POUR LA FORMATION DES MA�TRES Jean-Pierre LEVET Une partie'attention ici est lié à des éléments de réflexion humaniste appliquée aux NTIC. Le rapport préliminaire et les

Paris-Sud XI, Université de

459

La diffusion des sciences et des techniques l'Universit de Lige socit botANiqUe de Lige  

E-print Network

, floristique des plantes supérieures et des champignons, conservation de la nature, problèmes écologiques et'intéresse plus particulièrement aux sujets en rapport avec la conservation de la nature, à la vulgarisation récoltes des visiteurs par des spécialistes. - Animations enfants. Balade en forêt (pour les familles) à 11

Liège, Université de

460

Proprits en hautes frquences des transistors MOS canal court. Analyse thorique des proprits de la zone active  

E-print Network

763 Propriétés en hautes fréquences des transistors MOS à canal court. Analyse théorique des méthodes de détermination des paramètres hautes fréquences de la zone active du transistor MOS. Les effets de réduction de la mobilité des porteurs, particulièrement sensibles dans les transistors à canaux

Paris-Sud XI, Université de

461

Vitrification and levitation of a liquid droplet on liquid nitrogen.  

PubMed

The vitrification of a liquid occurs when ice crystal formation is prevented in the cryogenic environment through ultrarapid cooling. In general, vitrification entails a large temperature difference between the liquid and its surrounding medium. In our droplet vitrification experiments, we observed that such vitrification events are accompanied by a Leidenfrost phenomenon, which impedes the heat transfer to cool the liquid, when the liquid droplet comes into direct contact with liquid nitrogen. This is distinct from the more generally observed Leidenfrost phenomenon that occurs when a liquid droplet is self-vaporized on a hot plate. In the case of rapid cooling, the phase transition from liquid to vitrified solid (i.e., vitrification) and the levitation of droplets on liquid nitrogen (i.e., Leidenfrost phenomenon) take place simultaneously. Here, we investigate these two simultaneous physical events by using a theoretical model containing three dimensionless parameters (i.e., Stefan, Biot, and Fourier numbers). We explain theoretically and observe experimentally a threshold droplet radius during the vitrification of a cryoprotectant droplet in the presence of the Leidenfrost effect. PMID:20176969

Song, Young S; Adler, Douglas; Xu, Feng; Kayaalp, Emre; Nureddin, Aida; Anchan, Raymond M; Maas, Richard L; Demirci, Utkan

2010-03-01

462

Waves at surfactant-laden liquid-liquid crystal interface  

Microsoft Academic Search

A theoretical study is presented of surface waves at a monomolecular surfactant film between an isotropic liquid and a nematic liquid crystal for the case when the surfactant film is in the isotropic two-dimensional fluid phase and induces homeotropic (normal to the interface) orientation of the nematic director. The dispersion relation for the surface waves is obtained, and different surface

S. V. Lishchuk

2007-01-01

463

Liquid clathrate formation in ionic liquid-aromatic mixtures.  

PubMed

1-Alkyl-3-methylimidazolium containing ionic liquids with hexafluorophosphate, bis(trifyl)imide, tetrafluoroborate, and chloride anions form liquid clathrates when mixed with aromatic hydrocarbons; in the system 1,3-dimethylimidazolium hexafluorophosphate-benzene, the aromatic solute could be trapped in the solid state forming a crystalline 2:1 inclusion compound. PMID:12638957

Holbrey, John D; Reichert, W Matthew; Nieuwenhuyzen, Mark; Sheppard, Oonagh; Hardacre, Christopher; Rogers, Robin D

2003-02-21

464

DETAIL OF THE LIQUID HYDROGEN AND LIQUID OXYGEN VENT VALVES, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

DETAIL OF THE LIQUID HYDROGEN AND LIQUID OXYGEN VENT VALVES, SIXTH LEVEL OF THE EXTERNAL TANK CHECK-OUT CELLS, HB-2, FACING NORTHEAST - Cape Canaveral Air Force Station, Launch Complex 39, Vehicle Assembly Building, VAB Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

465

Vitrification and levitation of a liquid droplet on liquid nitrogen  

PubMed Central

The vitrification of a liquid occurs when ice crystal formation is prevented in the cryogenic environment through ultrarapid cooling. In general, vitrification entails a large temperature difference between the liquid and its surrounding medium. In our droplet vitrification experiments, we observed that such vitrification events are accompanied by a Leidenfrost phenomenon, which impedes the heat transfer to cool the liquid, when the liquid droplet comes into direct contact with liquid nitrogen. This is distinct from the more generally observed Leidenfrost phenomenon that occurs when a liquid droplet is self-vaporized on a hot plate. In the case of rapid cooling, the phase transition from liquid to vitrified solid (i.e., vitrification) and the levitation of droplets on liquid nitrogen (i.e., Leidenfrost phenomenon) take place simultaneously. Here, we investigate these two simultaneous physical events by using a theoretical model containing three dimensionless parameters (i.e., Stefan, Biot, and Fourier numbers). We explain theoretically and observe experimentally a threshold droplet radius during the vitrification of a cryoprotectant droplet in the presence of the Leidenfrost effect. PMID:20176969

Song, Young S.; Adler, Douglas; Xu, Feng; Kayaalp, Emre; Nureddin, Aida; Anchan, Raymond M.; Maas, Richard L.; Demirci, Utkan

2010-01-01

466

LIQUID-LIQUID RELATIVE PERMEABILITY: NETWORK MODELS AND EXPERIMENTS  

Microsoft Academic Search

Two different but related two-dimensional network models are used to elucidate the concept of relative permeability in simultaneous liquid-liquid flow in porous media. The first model is designed for monosized sphere packs while the other, consisting of spherical pore chambers interconnected by capillaries of variable length and radius, is intended for more general porous media. The effects of various operating

M. R. HOPKINS; K. M. NG

1986-01-01

467

Diagnostik des Williams-Beuren-Syndroms  

Microsoft Academic Search

Zusammenfassung   \\u000a \\u000a \\u000a Fragestellung: Die Diagnose des Williams-Beuren-Syndroms (WBS) wird durch die klinische Variabilität erschwert. Daher sollen der diagnostische\\u000a Wert sowohl des von Preus aufgestellten klinischen Scores als auch der Elastingenhemizygotie geprüft und miteinander verglichen\\u000a werden.\\u000a \\u000a \\u000a \\u000a \\u000a \\u000a Methodik: Bei 13 Kindern mit Verdacht auf WBS wurden der Preus-Score erhoben und eine Fluoreszenz-in situ-Hybridisierungs-Analyse des\\u000a Elastingens sowie eine Chromosomenanalyse durchgeführt.\\u000a \\u000a \\u000a \\u000a \\u000a \\u000a Ergebnisse: Neun der

Anita Rauch; U. Trautmann; H. Singer; B. Kevekordes; H. G. Dörr; R. A. Pfeiffer

1997-01-01

468

Comptes Rendus des JNC 16 Toulouse 2009 Un modle micro pour le calcul des structures en composites stratifis,  

E-print Network

Comptes Rendus des JNC 16 Toulouse 2009 Un modèle micro pour le calcul des structures en composites stratifiés, améliorations et simulations. A micro model for analysis of laminated composites, improvement Structural Mechanics » Résumé Un modèle micro pour la simulation des structures en composites stratifiés est

Paris-Sud XI, Université de

469

PROTECTION, VIS A VIS DES EXPLOSIONS, DES ^QUIPEMENTSDE TRANSPORT ET DE MANUTENTION UTILISANT L'ENERGIE ELECTRIQUE  

E-print Network

94-8 PROTECTION, VIS A VIS DES EXPLOSIONS, DES ^QUIPEMENTSDE TRANSPORT ET DE MANUTENTION UTILISANT anciennes decharges....). Dans tous ces emplacements peuvent exister des risques d'explosions du fait de la explosive dans l'air. Cette activite qui ne peut etre evitee ne doit pas augmenter les risques d'explosion

Boyer, Edmond

470

Les sous-units glutnines de haut poids mol-culaire des bls tendres et des bls durs cultivs  

E-print Network

cours des 20 dernières années. Mots clés additionnels : Triticum aestivum, Triticum durum, protéines the last 20 years. Additional key words : Triticum aestivum, Triticum durum, proteins, polymorphism ( Triticum aestivum) et des blés durs (T. durum) sont formées de 2 classes définies notamment par des

Paris-Sud XI, Université de

471

MMOIRES ORIGINAUX Sur l'origine des rayons 03B2 et 03B3 des substances radioactives  

E-print Network

produit thorium C, qui �met deux groupes distincts-de rayons x, ayant chacun un parcours dans l'air d des rayons intenses; par exemple, chacun des produits thorium Il et m�sotliorium !2 �met un certain ensemble environ 50 groupes de rayons homog�nes. Malgr� cette grande complexit� des rayons 8 de ces

Boyer, Edmond

472

LE BULLETIN DE L'EPI N 69 AFFICHER DES IMAGES SUR PC AFFICHER DES IMAGES SUR COMPATIBLE PC  

E-print Network

233 LE BULLETIN DE L'EPI N° 69 AFFICHER DES IMAGES SUR PC AFFICHER DES IMAGES SUR COMPATIBLE PC programme de pilotage IMAGEPCX.EXE et les *BGI [EGAVGA.BGI ou EGA.BGI..] lancer IMAGEPCX et se laisser L'EPI AFFICHER DES IMAGES SUR PC VI. OBTENTION DE CE PROGICIEL Ce produit est donné gratuitement en

Paris-Sud XI, Université de

473

Observation of equilibrium liquid-liquid transition in triphenyl phosphite  

NASA Astrophysics Data System (ADS)

The thermal signature of an equilibrium liquid-liquid transition (LLT) in triphenyl phosphite was detected by differential scanning calorimetry measurements at a fast heating rate reaching 500 K min-1. The estimated temperature, enthalpy, and entropy of the LLT were 241.7 K, 12.0 kJ mol-1, and 49.5 J K-1 mol-1, respectively. The estimated residual entropy for a glacial sample prepared at 224.7 K was 6 J K-1 mol-1; this value is much smaller than that for the normal glassy liquid. This glacial state was found to be a highly ordered liquid compared with the normal glassy liquid in terms of entropy.

Terashima, Y.; Tsuchie, M.; Takeda, K.; Honda, M.

2013-10-01

474

A Liquid-Liquid Transition in an Undercooled Ti-Zr-Ni Liquid  

NASA Technical Reports Server (NTRS)

If crystallization can be avoided, liquids enter a metastable (undercooled) state below their equilibrium liquidus temperatures, TI, finally freezing into a glass below a characteristic temperature called the glass transition temperature, T,. In rare cases, the undercooled liquid may undergo a liquid-liquid phase transition (liquid polymorphism) before entering the glassy state. This has been suggested from experimental studies of HzO and Si4. Such phase transitions have been predicted in some stable liquids, i.e. above TI at atmospheric pressure, for Si02 and BeF;, but these have not been verified experimentally. They have been observed in liquids of P7, Sis and C9, but only under high pressure. All of these transitions are driven by an anomalous density change, i.e. change in local structure, with temperature or pressure. In this letter we present the first experimental evidence for a phase transition in a low viscosity liquid that is not driven by an anomalous density change, but by an approach to a constant configuration state. A maximum in the specific heat at constant pressure, similar to what is normally observed near T,, is reported here for undercooled low viscosity liquids of quasicrystal- forming Ti-Zr-Ni alloys. that includes cooperativity, by incorporating a temperature dependent excitation energy fits the data well, signaling a phase transition.

Lee, G. W.; Gangopadhyay, A. K.; Kelton, K. F.; Hyers, R. W.; Rathz, T. J.; Rogers, J. R.

2003-01-01

475

Liquid-liquid critical point in supercooled silicon  

E-print Network

A novel liquid-liquid phase transition has been proposed and investigated in a wide variety of pure substances recently, including water, silica and silicon. From computer simulations using the Stillinger-Weber classical empirical potential, Sastry and Angell [1] demonstrated a first order liquid-liquid transition in supercooled silicon, subsequently supported by experimental and simulation studies. Here, we report evidence for a liquid-liquid critical end point at negative pressures, from computer simulations using the SW potential. Compressibilities exhibit a growing maximum upon lowering temperature below 1500 K and isotherms exhibit density discontinuities below 1120 K, at negative pressure. Below 1120 K, isotherms obtained from constant volume-temperature simulations exhibit non-monotonic, van der Waals-like behavior signaling a first order transition. We identify Tc ~ 1120 +/- 12 K, Pc -0.60 +/- 0.15 GPa as the critical temperature and pressure for the liquid-liquid critical point. The structure of the liquid changes dramatically upon decreasing the temperature and pressure. Diffusivities vary over 4 orders of magnitude, and exhibit anomalous pressure dependence near the critical point. A strong relationship between local geometry quantified by the coordination number, and diffusivity, is seen, suggesting that atomic mobility in both low and high density liquids can usefully be analyzed in terms of defects in the tetrahedral network structure. We have constructed the phase diagram of supercooled silicon. We identify the lines of compressibility, density extrema (maxima and minima) and the spinodal which reveal the interconnection between thermodynamic anomalies and the phase behaviour of the system as suggested in previous works [2-9

Vishwas V Vasisht; Shibu Saw; Srikanth Sastry

2011-03-17

476

Tape Management La Gestion des Volumes  

E-print Network

TMS Centre de Calcul de l¢IN2P3 28 novembre 1994 #12; TMS Préface La version originelle de TMS a été¢IN2P3. L¢équipe ²TMS² de l¢IN2P3, à l¢origine, était composée des ingénieurs suivants des équipes octobre 91. Le developpement de TMS. ii #12; TMS Résumé Le manuel utilisateur de TMS (Tape Management

477

Liquid–liquid extraction of actinides, lanthanides, and fission products by use of ionic liquids: from discovery to understanding  

Microsoft Academic Search

Liquid–liquid extraction of actinides and lanthanides by use of ionic liquids is reviewed, considering, first, phenomenological\\u000a aspects, then looking more deeply at the various mechanisms. Future trends in this developing field are presented.

Isabelle Billard; Ali Ouadi; Clotilde Gaillard

2011-01-01

478

Liquid crystal polyester thermosets  

DOEpatents

The present invention provides (1) curable liquid crystalline polyester monomers represented by the formula: R.sup.1 --A.sup.1 --B.sup.1 --A.sup.2 --B.sup.2 --A.sup.3 --R.sup.2 where R.sup.1 and R.sup.2 are radicals selected from the group consisting of maleimide, substituted maleimide, nadimide, substituted naimide, ethynyl, and (C(R.sup.3).sub.2).sub.2 where R.sup.3 is hydrogen with the proviso that the two carbon atoms of (C(R.sup.3).sub.2).sub.2 are bound on the aromatic ring of A.sup.1 or A.sup.3 to adjacent carbon atoms, A.sup.1 and A.sup.3 are 1,4-phenylene and the same where said group contains one or more substituents selected from the group consisting of halo, e.g., fluoro, chloro, bromo, or iodo, nitro lower alkyl, e.g., methyl, ethyl, or propyl, alkoxy, e.g., methoxy, ethoxy, or propoxy, and fluoroalkyl, e.g., trifluoromethyl, pentafluoroethyl and the like, A.sup.2 is selected from the group consisting of 1,4-phenylene, 4,4'-biphenyl, 2,6-naphthylene and the same where said groups contain one or more substituents selected from the group consisting of halo, e.g., fluoro, chloro, bromo, or iodo, nitro, lower alkyl, e.g., methyl, ethyl, and propyl, lower alkoxy, e.g., methoxy, ethoxy, or propoxy, and fluoroalkyl or fluoroalkoxy, e.g., trifluoromethyl, pentafluoroethyl and the like, and B.sup.1 and B.sup.2 are selected from the group consisting of --C(O)--O-- and --O--C(O)--, (2) thermoset liquid crystalline polyester compositions comprised of heat-cured segments derived from monomers represented by the formula: R.sup.1 --A.sup.1 --B.sup.1 --A.sup.2 --B.sup.2 --A.sup.3 --R.sup.2 as described above, (3) curable blends of at least two of the polyester monomers and (4) processes of preparing the curable liquid crystalline polyester monomers.

Benicewicz, Brian C. (Los Alamos, NM); Hoyt, Andrea E. (Los Alamos, NM)

1992-01-01

479

Toxicité recto-colique des anti-inflammatoires non stéroïdiens  

Microsoft Academic Search

Résumé  La toxicité recto-colique des AINS est moins connue des prescripteurs que leurs effets secondaires gastro-duodénaux. On peut\\u000a distinguer l’effet nocif des AINS sur des pathologies basses préexistantes et les lésions induites « de novo » aiguës et chroniques.\\u000a La prise d’AINS favorise la survenue des complications de la maladie diverticulaire et il est probable qu’elle puisse déclencher\\u000a d’authentiques poussées de

F. Castex; B. Bazin; J.-F. Colombel

1995-01-01

480

White Mode Liquid Crystal Display.  

National Technical Information Service (NTIS)

Fundamental technolgies to realize a super high multiplex driving black-and-white (B/W) liquid crystal display (LCD) have been developed. The super high multiplex LCD panel uses liquid crystal material having a low viscosity, large optical anisotropy and ...

S. Kosako, S. Koyabu, M. Nishinaka, K. Kumagawa

1989-01-01

481

Electron liquid in disordered conductors  

Microsoft Academic Search

In this book the author proceeds from a description of a disordered electron liquid via effective functional or diffusion modes to a theory of interacting electrons in disordered conductors that is of the Fermi-liquid type but with renormalizable parameters. The influence of disorder on the temperature of the superconducting transition in homogeneous amorphous films is analyzed theoretically. Critical properties in

Finkelstein

1990-01-01

482

Boiling liquid engine cooling system  

Microsoft Academic Search

A boiling liquid cooling system is described for an engine, comprising: means defining in the engine a coolant jacket into which coolant is introduced in liquid state and from which coolant is discharged in gaseous state; a radiator into which gaseous coolant from the coolant jacket is introduced to be liquified; an electric pump for pumping the coolant thus liquified

N. Miura; Y. Hayashi

1987-01-01

483

Liquid Crystals Interact with Light!  

NSDL National Science Digital Library

In this two-part activity, learners explore the properties of liquid crystals, which are responsible for why mood rings change color. In the first experiment, learners will see how liquid crystals change color (and phase) with temperature. In the second activity, learners will conduct an experiment to find out if mood rings change color because of magic or chemistry.

Shaw, Maisie; Gomez, Maria

2010-01-01

484

Free liquid scintillation counting bibliography  

SciTech Connect

Packard Instrument Company announces the availability of its newly updated Bibliography of Packard Tri-Carb Liquid Scintillation Analyzers. This unique new booklet lists 628 references in which Packard Tri-Carb{reg_sign} liquid scintillation analyzers have been used in life science, environmental, nuclear power and archaeological measurements. All listings are cross-referenced by radionuclide, specific field of study and author.

NONE

1996-12-31

485

Triglyceride analysis by consecutive liquid-liquid partition and gas-liquid chromatography. Ephedra nevadensis seed fat  

Microsoft Academic Search

The triglyceride composition ofEphedra nevadensis seed fat, which contains 16 different fatty acids, has been analyzed by a combination of liquid-liquid partition and gas-liquid\\u000a chromatography. Triglycerides were first separated by liquid-liquid partition chromatography. The recovered fractions were\\u000a then analyzed by gas-liquid chromatography to determine the molecular weights of the triglycerides present. Consecutive separation\\u000a by these two techniques resolved this complex

Carter Litchfield

1968-01-01

486

Supported liquid membrane system  

SciTech Connect

A cell apparatus for a supported liquid membrane including opposing faceplates, each having a spirally configured groove, an inlet groove at a first end of the spirally configured groove, and an outlet groove at the other end of the spirally configured groove, within the opposing faces of the faceplates, a microporous membrane situated between the grooved faces of the faceplates, said microporous membrane containing an extractant mixture selective for a predetermined chemical species within the pores of said membrane, means for aligning the grooves of the faceplates in an directly opposing configuration with the porous membrane being situated therebetween, such that the aligned grooves form a pair of directly opposing channels, separate feed solution and stripping solution compartments connected to respective channels between the faceplates and the membrane, separate pumping means for passing feed solution and stripping solution through the channels is provided.

Takigawa, D.Y.; Bush, H. Jr.

1990-12-31

487

Shaped composite liquid marbles.  

PubMed

Shaped "cubic" non-stick droplets are reported. Shaped composite droplets were manufactured via a two-stage process. In the first stage, cubic foamed-polystyrene particles were hydrophilized with cold radiofrequency plasma. Then particles were wetted with water. In the second stage, they were coated with solid, colloidal particles such as lycopodium, Teflon or carbon black. Thus, "liquid marble"-like non-stick shaped droplets were obtained. The shaped "cubic" droplets remained stable when supported by a NaCl water solution. Shaped Janus droplets coated on one side with dielectric Teflon and with semiconductor carbon black on the other side, were prepared. Janus marbles were actuated with an electric field. PMID:24407678

Bormashenko, Edward; Balter, Revital; Aharoni, Hadas; Aurbach, Doron

2014-03-01

488

Liquid-permeable electrode  

DOEpatents

Electrodes for use in an electrolytic cell, which are liquid-permeable and have low electrical resistance and high internal surface area are provided of a rigid, porous, carbonaceous matrix having activated carbon uniformly embedded throughout. The activated carbon may be catalyzed with platinum for improved electron transfer between electrode and electrolyte. Activated carbon is mixed with a powdered thermosetting phenolic resin and compacted to the desired shape in a heated mold to melt the resin and form the green electrode. The compact is then heated to a pyrolyzing temperature to carbonize and volatilize the resin, forming a rigid, porous structure. The permeable structure and high internal surface area are useful in electrolytic cells where it is necessary to continuously remove the products of the electrochemical reaction.

Folser, George R. (Lower Burrell, PA)

1980-01-01

489

Liquid level sensor  

SciTech Connect

The article reports an idea of using a simple, cantilever-type load cell with a rod as a level sensor for continuous liquid level measurements. The sensor is based on the principle of the Archimedes buoyancy principle. The density and geometry of the rod govern the choice of the load cell. The length of the rod is governed by the height of the tank. A series of cyclic tests have demonstrated a highly repeatable response of the sensor. The accuracy of this low-cost sensor is field tested and found to be {+-}0.5% of the full range, for a 10 m level of water in a tank, and is working reliably for the period of 18 months. The sensor range can be easily extended to lower and higher tank heights. The sensor is crowned by its easy installation and calibration.

Kulkarni, Atul; Karekar, R.N.; Aiyer, R.C. [Department of Physics, University of Pune, Pune 411007 (India); RCMF Transducer Laboratory, Department of Physics, University of Pune, Pune 411007 (India); Thin Film Laboratory, Department of Physics, University of Pune, Pune 411007 (India)

2005-10-15

490

Relation entre les caract?ristiques des table-bancs et les mesures anthropom?triques des ?coliers au Benin  

PubMed Central

Introduction Le mobilier scolaire et la posture assise en classe sont souvent impliqués dans l'apparition des douleurs rachidiennes, influant de fait sur la qualité des tâches réalisées par les apprenants. Aucune étude n'a encore vérifié le degré d'adéquation entre les caractéristiques du mobilier et celles des écoliers au Bénin. L'objectif de cette étude transversale est donc de déterminer la relation entre les dimensions des table-bancs utilisées en classe et les mesures anthropométriques des écoliers au Bénin. Methods Elle a été réalisée avec un échantillon probabiliste de 678 écoliers, âgés de 4 à 17 ans. Les mesures anthropométriques des écoliers et les mensurations relatives aux longueurs, largeurs et hauteurs des table-bancs ont été mesurées, puis intégrées aux équations proposées dans la littérature. Les pourcentages des valeurs situées hors des limitesacceptables, dérivées de l'application des équations ont été calculés. Results La largeur et la hauteur des table-bancs utilisées par les écoliers étaient plus élevées (p < 0,05) que les valeurs de référence recommandées par les structures officielles de contrôle et de production des mobiliers scolaires au Bénin. Quel que soit le sexe, il y avait une inadéquation entre la largeur du banc et la longueur fesse-poplité, puis entre la hauteur de la table et la distance coude-bancdes écoliers. Conclusion Les résultats suggèrent de prendre en compte l’évolution des mesures anthropométriques des écoliers dans la confection des table-bancs, afin de promouvoir de bonnes postures assises en classe et de réduire le risque de troubles du rachis. PMID:25317232

Falola, Steve Marjelin; Gouthon, Polycarpe; Falola, Jean-Marie; Fiogbe, Michel Armand; Nigan, Issiako Bio

2014-01-01

491

Scolarisation des enfants d'immigrs en France : tat des lieux et tat des questions en 1995  

E-print Network

Les enfants de l'immigration : identité inachevée, normes à inventer Henri SAINT-JEAN, Formateur à populations issues de l'immigration refusent leur relégation. Ce ne sont pas des revendications identitaires françaises » ont montré que les populations issues de l'immigration refusaient leur assignation à une

Boyer, Edmond

492

Quantum disentangled liquids  

NASA Astrophysics Data System (ADS)

We propose and explore a new finite temperature phase of translationally invariant multi-component liquids which we call a ‘Quantum Disentangled Liquid’ (QDL) phase. We contemplate the possibility that in fluids consisting of two (or more) species of indistinguishable quantum particles with a large mass ratio, the light particles might ‘localize’ on the heavy particles. We give a precise, formal definition of this QDL phase in terms of the finite energy density many-particle wavefunctions. While the heavy particles are fully thermalized, for a typical fixed configuration of the heavy particles, the entanglement entropy of the light particles satisfies an area law; this implies that the light particles have not thermalized. Equivalently, but more intuitively, if the positions of all the heavy particles are measured, the projected wavefunction for the unmeasured light particles has as an area law entanglement entropy. Thus, in a QDL phase, thermal equilibration is incomplete, and the canonical assumptions of statistical mechanics are not fully operative. The definition of the QDL phase for heavy/light particles can be readily generalized to other cases with two (or more) conserved currents, such as spin/charge in a system of spin-1/2 fermions (as in a Hubbard model). Indeed, we argue that the finite energy-density eigenstates of the t–J model will generically be in such a spin/charge QDL, although the fate of the QDL in the large U Hubbard model is uncertain. We explore the possibility of QDL in water, with the light proton degrees of freedom becoming ‘localized’ on the oxygen ions. While we do not presently know whether a local, generic Hamiltonian can have eigenstates of the QDL form, if not, then the non-thermal behavior discussed here will exist as an interesting crossover phenomena at a time scale that diverges as the ratio of the mass of the heavy to the light particles also diverges.

Grover, Tarun; Fisher, Matthew P. A.

2014-10-01

493

Dynamische Modellierung des Gaspfades eines Gesamt-IGCC-Kraftwerkes auf Basis des SFG-Verfahrens.  

E-print Network

??Im Rahmen der vorliegenden Arbeit werden dynamische Modelle eines IGCC-Kraftwerkes mit CO2-Abtrennung unter Verwendung des Modellierungstools Modelica/Dymola entwickelt. Dabei liegt der Schwerpunkt auf dem Gaspfad… (more)

Bauersfeld, Sindy

2014-01-01

494

Le desschement prcoce des tournesols. Dyna-mique de la colonisation des plantes par les  

E-print Network

maturation des graines. Mots clés additionnels : Helianthus annuus L., Fusarium spp., Cylindrocarpon spp words : Helianthus annuus L., Fusarium spp., Cylindrocarpon spp., Pythium spp., roots, stems, critical

Boyer, Edmond

495

Modeling Liquid crystal configurations 1 Modeling liquid crystal structures using MPI on a workstation cluster  

E-print Network

Modeling Liquid crystal configurations 1 Modeling liquid crystal structures using MPI Introduction Liquid crystals are so called because they exhibit some of the properties of both the liquid orientational and positional order, and the isotropic liquid phase, which exhibits neither. Liquid crystals re

Farrell, Paul A.

496

The Liquid Argon Purity Demonstrator  

E-print Network

The Liquid Argon Purity Demonstrator was an R&D test stand designed to determine if electron drift lifetimes adequate for large neutrino detectors could be achieved without first evacuating the cryostat. We describe here the cryogenic system, its operations, and the apparatus used to determine the contaminant levels in the argon and to measure the electron drift lifetime. The liquid purity obtained by this system was facilitated by a gaseous argon purge. Additionally, gaseous impurities from the ullage were prevented from entering the liquid at the gas-liquid interface by condensing the gas and filtering the resulting liquid before returning to the cryostat. The measured electron drift lifetime in this test was greater than 6 ms, sustained over several periods of many weeks. Measurements of the temperature profile in the argon, to assess convective flow and boiling, were also made and are compared to simulation.

Adamowski, M; Dvorak, E; Hahn, A; Jaskierny, W; Johnson, C; Jostlein, H; Kendziora, C; Lockwitz, S; Pahlka, B; Plunkett, R; Pordes, S; Rebel, B; Schmitt, R; Stancari, M; Tope, T; Voirin, E; Yang, T

2014-01-01

497

Magnetically focused liquid drop radiator  

DOEpatents

A magnetically focused liquid drop radiator for application in rejecting energy from a spacecraft, characterized by a magnetizable liquid or slurry disposed in operative relationship within the liquid droplet generator and its fluid delivery system, in combination with magnetic means disposed in operative relationship around a liquid droplet collector of the LDR. The magnetic means are effective to focus streams of droplets directed from the generator toward the collector, thereby to assure that essentially all of the droplets are directed into the collector, even though some of the streams may be misdirected as they leave the generator. The magnetic focusing means is also effective to suppress splashing of liquid when the droplets impinge on the collector.

Botts, T.E.; Powell, J.R.; Lenard, R.

1984-12-10

498

Immobilization of organic liquid wastes  

SciTech Connect

This report describes a portland cement immobilization process for the disposal treatment of radioactive organic liquid wastes which would be generated in a a FFTF fuels reprocessing line. An incineration system already on-hand was determined to be too costly to operate for the 100 to 400 gallons per year organic liquid. Organic test liquids were dispersed into an aqueous phosphate liquid using an emulsifier. A total of 109 gallons of potential and radioactive aqueous immiscible organic liquid wastes from Hanford 300 Area operations were solidified with portland cement and disposed of as solid waste during a 3-month test program with in-drum mixers. Waste packing efficiencies varied from 32 to 40% and included pump oils, mineral spirits, and TBP-NPH type solvents.

Greenhalgh, W.O.

1985-08-07

499

12 CFR 704.9 - Liquidity management.  

Code of Federal Regulations, 2010 CFR

...2010-01-01 2010-01-01 false Liquidity management. 704.9 Section 704...CORPORATE CREDIT UNIONS § 704.9 Liquidity management. (a) General. In the management of liquidity, a corporate credit union must:...

2010-01-01

500

21 CFR 880.5090 - Liquid bandage.  

Code of Federal Regulations, 2010 CFR

... 2010-04-01 2010-04-01 false Liquid bandage. 880.5090 Section 880.5090...Personal Use Therapeutic Devices § 880.5090 Liquid bandage. (a) Identification. A liquid bandage is a sterile device that is a...

2010-04-01