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1

Cobalt carbonyl catalyzed olefin hydroformylation in supercritical carbon dioxide  

DOEpatents

A method of olefin hydroformylation is provided wherein an olefin reacts with a carbonyl catalyst and with reaction gases such as hydrogen and carbon monoxide in the presence of a supercritical reaction solvent, such as carbon dioxide. The invention provides higher yields of n-isomer product without the gas-liquid mixing rate limitation seen in conventional Oxo processes using liquid media.

Rathke, J.W.; Klingler, R.J.

1993-03-30

2

A Hybrid Phosphorus Ligand for Highly Enantioselective Asymmetric Hydroformylation  

E-print Network

A Hybrid Phosphorus Ligand for Highly Enantioselective Asymmetric Hydroformylation Yongjun Yan phosphorus ligand has been prepared starting from chiral NOBIN (2-amino-2- hydroxy-1,1-binaphthyl). Excellent phosphorus ligands bearing two different phosphorus groups are effective in asymmetric hydroformylation.2a

Zhang, Xumu

3

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

4

Intensification of the solvent-free catalytic hydroformylation of cyclododecatriene: Comparison of a stirred batch reactor and a heat-exchange reactor  

Microsoft Academic Search

The potential of heat-exchange reactors with mm-scale channels to provide process intensification for homogeneously catalysed gas–liquid reactions was explored. The solvent-free hydroformylation of cyclododecatriene using a homogeneous catalyst was carried out in a heat-exchange (HEx) reactor with mm-scale thin channels, and in a stirred batch autoclave for comparative purposes. The reaction was carried out using generally a concentration of 0.3mol%

Dan I. Enache; William Thiam; Delphine Dumas; Simon Ellwood; Graham J. Hutchings; Stuart H. Taylor; Steve Hawker; E. H. Stitt

2007-01-01

5

SUR LA CONSTANTE DE KERR DES LIQUIDES CONDUCTEURS Par M. PAUTHENIER  

E-print Network

SUR LA CONSTANTE DE KERR DES LIQUIDES CONDUCTEURS Par M. PAUTHENIER Nous avons réalisé une nouvelle la constante de Kerr de liquides assez bons conducteurs. Principe. - Le liquide à étudier, compris pratique. - La mesure de la cons- tante de Kerr se fait par une méthode de compensation. Le liquide de

Paris-Sud XI, Université de

6

Facile catalyst separation without water: Fluorous biphase hydroformylation of olefins  

SciTech Connect

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 perfuoralkyl 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.

Horvath, I.T.; Rabai, J. [Exxon Research and Engineering Co., Annandale, NJ (United States)

1994-10-07

7

MTHODE DE DOSAGE DES ACIDES GRAS VOLATILS DANS LE LIQUIDE DU RUMEN  

E-print Network

M�THODE DE DOSAGE DES ACIDES GRAS VOLATILS DANS LE LIQUIDE DU RUMEN J. RIGAUD M. JOURNET Jeanne méthode rapide de dosage des acides gras volatils, dans le liquide du rumen, par chromatographie en phase gazeuse. A l'échantillon filtré grossièrement, on ajoute de l'acide formique et du butanol comme étalon

Paris-Sud XI, Université de

8

Tandem hydroformylation/hydrogenation of alkenes to normal alcohols using Rh/Ru dual catalyst or Ru single component catalyst.  

PubMed

The catalyst system for tandem hydroformylation/hydrogenation of terminal alkenes to the corresponding homologated normal alcohol was developed. The reaction mechanism for the Rh/Ru dual catalyst was investigated by real-time IR monitoring experiments and (31)P NMR spectroscopy, which proved the mutual orthogonality of Rh-catalyzed hydroformylation and Ru-catalyzed hydrogenation. Detailed investigation about Ru-catalyzed hydrogenation of undecanal under H(2)/CO pressure clarified different kinetics from the hydrogenation under H(2) and gave a clue to design more active hydrogenation catalysts under H(2)/CO atmosphere. The solely Ru-catalyzed normal selective hydroformylation/hydrogenation is also reported. PMID:23116366

Takahashi, Kohei; Yamashita, Makoto; Nozaki, Kyoko

2012-11-14

9

Development of heterogeneous catalysts for hydroformylation of 1-hexene in supercritical carbon dioxide  

NASA Astrophysics Data System (ADS)

The hydroformylation of alkenes is a major commercial process used for the production of oxygenated organic compounds. When the hydroformylation reaction is performed using a homogeneous catalyst, an organic or aqueous solvent is employed and a significant effort must be expended to recover the catalyst so it can be recycled. The hydroformylation of long-chain alkenes using homogeneous catalysts in aqueous solution is compromised because of the low-solubility of C5 alkenes and above. Development of a selective heterogeneous catalyst would allow simplification of the process design in an integrated system that minimizes waste generation. Recent studies have shown that a supercritical fluid may be used as a solvent for hydroformylation reactions. The use of carbon dioxide as a reaction solvent offers optimal environmental performance because it is non-toxic, non-flammable and plentiful, and presents advantages for ease of product separation. In particular, we have considered the conversion of 1-hexene to heptanal using rhodium-phosphine catalysts tethered to supports insoluble in supercritical carbon dioxide to demonstrate the advantages and understand the limitations of a solid-catalyzed process. One of the limitations of supported catalysts is the inability to control product selectivity. To remedy this problem, we have developed tethered rhodium-phosphine catalysts with modified silica and controlled-pore size MCM-41 and MCM-20 supports that provide improved selectivity and conversion relative to their nonporous equivalents. Platinum and palladium catalysts analogous to those of rhodium were also investigated. The synthesis and characterization of the rhodium, platinum and palladium complexes and evaluation of their catalytic activity and selectivity for hydroformylation in supercritical carbon dioxide is described in this dissertation.

Marteel, Anne Eugenie

10

A silica-supported, switchable, and recyclable hydroformylation-hydrogenation catalyst.  

PubMed

A homogeneous hydroformylation catalyst, designed to produce selectively linear aldehydes, was covalently tethered to a polysilicate support. The immobilized transition-metal complex [Rh(A)CO]+(1+)), in which A is N-(3-trimethoxysilane-n-propyl)-4,5-bis(diphenylphosphino)phenoxazine, was prepared both via the sol-gel process and by covalent anchoring to silica. 1+ was characterized by means of (31)P and (29)Si MAS NMR, FT-IR, and X-ray photoelectron spectroscopy. Polysilicate immobilized Rh(A) performed as a selective hydroformylation catalyst showing an overall selectivity for the linear aldehyde of 94.6% (linear to branched aldehyde ratio of 65). In addition 1-nonanol, obtained via the hydrogenation of the corresponding aldehyde, was formed as an unexpected secondary product (3.6% at 20% conversion). Under standard hydroformylation conditions, 1+ and HRh(A)(CO)(2)(1) coexist on the support. This dual catalyst system performed as a hydroformylation/hydrogenation sequence catalyst (Z), giving selectively 1-nonanol from 1-octene; ultimately, 98% of 1-octene was converted to mainly 1-nonanal and 97% of the nonanal was hydrogenated to 1-nonanol. The addition of 1-propanol completely changes Z in a hydroformylation catalyst (X), which produces 1-nonanal with an overall selectivity of 93%, and completely suppresses the reduction reaction. If the atmosphere is changed from CO/H(2) to H(2) the catalyst system is switched to the hydrogenation mode (Y), which shows a clean and complete hydrogenation of 1-octene and 1-nonanal within 24 h. The immobilized catalyst can be recycled and the system can be switched reversibly between the three "catalyst modes" X, Y, and Z, completely retaining the catalyst performance in each mode. PMID:11525653

Sandee, A J; Reek, J N; Kamer, P C; van Leeuwen, P W

2001-09-01

11

Aqueous-phase hydroformylation of 1-octene using hydrophilic sulfonate salicylaldimine dendrimers.  

PubMed

Water-soluble dendritic ligands based on tris-2-(5-sulfonato salicylaldimine ethyl)amine (5) and DAB-(5-sulfonato salicylaldimine) (6) (DAB = diaminobutane) were synthesized by means of Schiff base condensation and sulfonation reactions. These dendritic ligands were fully characterized by (1)H NMR, (13)C NMR and FT-IR spectroscopy, elemental analysis and mass spectrometry. Dendritic ligands (5 and 6) in combination with [RhCl(COD)](2) (COD = 1,5-cyclooctadiene) were evaluated in aqueous biphasic hydroformylation of 1-octene. New water-soluble mononuclear 5-sulfonato propylsalicylaldimine Rh(i) complexes (7 and 8) were synthesized and characterized using (1)H NMR, (13)C NMR and FT-IR spectroscopy, elemental analysis as well as mass spectrometry. These complexes were applied as catalyst precursors in aqueous biphasic hydroformylation reactions. All the catalyst precursors were active in the hydroformylation of 1-octene under the investigated conditions. Optimal conditions were realized at 75 °C (40 bars), where the best selectivity for aldehydes was noticed. Catalyst recycling was achieved up to 5 times with minimal loss in conversion and consistent chemoselectivities and regioselectivities. Less Rh leaching was observed in the dendritic systems (5 and 6)/[RhCl(COD)](2) as compared to mononuclear catalyst precursors (7 and 8) as determined by inductively coupled plasma-mass spectrometry (ICP-MS). PMID:23023586

Hager, Emma B; Makhubela, Banothile C E; Smith, Gregory S

2012-12-01

12

RECHERCHES EXPRIMENTALES SUR LA VITESSE D'COULEMENT DES LIQUIDES PAR UN ORIFICE EN MINCE PAROI;  

E-print Network

30I RECHERCHES EXP�RIMENTALES SUR LA VITESSE D'�COULEMENT DES LIQUIDES PAR UN ORIFICE EN MINCE ). Lorsdu'un vase est percé d'un orifice en mince paroi, au-dessus duquel le niveau du liquide se trouve à libre, du niveau supérieur à celui de l'orifice, et l'on a 1 - Cette loi a été démontrée théoriquement

Paris-Sud XI, Université de

13

Comptes Rendus des JNC 16 Toulouse 2009 Suivi du procd de la fabrication Liquid Resin Infusion (LRI) sur  

E-print Network

Comptes Rendus des JNC 16 Toulouse 2009 Suivi du procédé de la fabrication Liquid Resin Infusion (LRI) sur simulateur industriel par capteurs distribués Monitoring the Liquid Resin Infusion (LRI.HENRAT@hexcel.com Résumé Les procédés par infusion de résine LRI (Liquid Resin Infusion) sont des procédés de fabrication

Paris-Sud XI, Université de

14

Vitesse de passage des rsidus alimentaires et des liquides dans le tube digestif du mouton  

E-print Network

différents types de marqueurs : oxyde de chrome mordancé (Cr- mord.) ou imprégné sur poudre de cellulose (Cr le Cr-mord. (tabi. 11. Les différences entre marqueurs apparaissent essentiel- lement au niveau des du temps de séjour moyen doit être intermédiaire entre celle du Cr- mord et celles du Cr-cell ou de l

Paris-Sud XI, Université de

15

Paraformaldehyde and Methanol as C1 Feedstocks in Metal-Catalyzed C?C Couplings of ?-Unsaturated Reactants: Beyond Hydroformylation.  

PubMed

Ruthenium-catalyzed reductive couplings of paraformaldehyde with dienes, alkynes, and allenes provide access to products of hydrohydroxymethylation that cannot be formed selectively under the conditions of hydroformylation. In certain cases, the regioselectivity of the C?C coupling can be inverted by using nickel catalysts. With iridium catalysts, methanol engages in redox-neutral regioselective hydrohydroxymethylations. PMID:25430585

Sam, Brannon; Breit, Bernhard; Krische, Michael J

2014-11-27

16

Organic chemistry. Rh-catalyzed C-C bond cleavage by transfer hydroformylation.  

PubMed

The dehydroformylation of aldehydes to generate olefins occurs during the biosynthesis of various sterols, including cholesterol in humans. Here, we implement a synthetic version that features the transfer of a formyl group and hydride from an aldehyde substrate to a strained olefin acceptor. A Rhodium (Xantphos)(benzoate) catalyst activates aldehyde carbon-hydrogen (C-H) bonds with high chemoselectivity to trigger carbon-carbon (C-C) bond cleavage and generate olefins at low loadings (0.3 to 2 mole percent) and temperatures (22° to 80°C). This mild protocol can be applied to various natural products and was used to achieve a three-step synthesis of (+)-yohimbenone. A study of the mechanism reveals that the benzoate counterion acts as a proton shuttle to enable transfer hydroformylation. PMID:25554782

Murphy, Stephen K; Park, Jung-Woo; Cruz, Faben A; Dong, Vy M

2015-01-01

17

SUR LA THORIE DE L'COULEMENT DES LIQUIDES PAR LES ORIFICES EN MINCE PAROI, CIRCULAIRES OU RECTANGULAIRES ALLONGS; CALCUL  

E-print Network

265 SUR LA TH�ORIE DE L'�COULEMENT DES LIQUIDES PAR LES ORIFICES EN MINCE PAROI, CIRCULAIRES OU DE L'ORIFICE; PAR M. J. BOUSSINESQ. 1' 1. (.orsqu'un vase plein de liquide est percé, à travers une partie plane et mince de sa paroi, d'un orifice cr, de dimensions très petites par rapport à ses

Boyer, Edmond

18

Étude de l'efficacité des modes de Lamb dans la signature acoustique en fonction du liquide de couplage  

NASA Astrophysics Data System (ADS)

The acoustic signature allows to measure the velocity of the longitudinal and transverse acoustic waves in bulk materials. From the velocities and density values the elastic properties can be calculated. For thin layer materials, these velocities are not directly measured but computed from the experimentally available velocities: the generalized Lamb waves velocities. These waves velocities are dispersive and their measurement depends on the liquid acting as a coupling fluid. In this study, the two faces of the layer are in contact with the liquid (methanol, water or aqueous solutions of potassium iodide KI_aq. 6 M and potassium hydroxyde KOH_aq. 12 M) chosen according to its acoustic parameters. The acoustic signature modeling allows to know their respective influence, the possible detection of the fast modes and, in general, the velocity measurement accuracy increase for all available modes. The experimental studies bear out that each mode characterization may be optimized by the appropriate choice of the frequency and of the coupling liquid according to its velocity, density and attenuation. L'étude de la signature acoustique permet de mesurer les vitesses de propagation des ondes acoustiques longitudinale et transverse dans les matériaux massifs, vitesses à partir desquelles on détermine leurs propriétés mécaniques. Pour des matériaux en couche mince, ces vitesses ne sont plus mesurées directement mais calculées à partir des vitesses accessibles expérimentalement : celles des modes de Lamb généralisés. Ces modes ont des vitesses dispersives et leur mesure dépend du liquide servant de couplant, dans lequel la couche est immergée. Dans cette étude, les liquides de couplage (méthanol, eau et solutions aqueuses de iodure de potassium KI_aq. 6 M et d'hydroxyde de potassium KOH_aq. 12 M) sont choisis en fonction de leurs paramètres acoustiques. La modélisation de la signature acoustique permet de prévoir leur influence respective, comment ils vont favoriser la détection des modes rapides et, d'une façon générale, augmenter la précision sur la mesure de la vitesse de tous les modes accessibles. Les études expérimentales confirment que la caractérisation de chaque mode peut être optimisée par le choix d'une part de la fréquence et d'autre part du liquide de couplage en fonction de sa vitesse, sa densité et son atténuation.

Brunet, N.; Cros, B.; Despaux, G.; Saurel, J.-M.

1998-06-01

19

LA DTECTION DES NEUTRONS RAPIDES A L'AIDE DE CHAMBRES D'IONISATION REMPLIES D'HEXANE LIQUIDE  

E-print Network

31 A LA D�TECTION DES NEUTRONS RAPIDES A L'AIDE DE CHAMBRES D'IONISATION REMPLIES D'HEXANE LIQUIDE Sciences, Toulouse. Résumé. 2014 L'emploi d'un sachet étanche de polyéthylène rempli d'hexane et serré The use of a vacuum-tight polyethylene bag filled with hexane and inserted between the electrodes

Paris-Sud XI, Université de

20

A Propos de la prétendue action inhibitrice du liquide Coelomique sur la Membranogénèse et sur la Segmentation des Oeufs D'Oursin  

Microsoft Academic Search

Resumé 1.Le liquide coelomique duParacentrotus lividus n'exerce aucune action inhibitrice ni sur le processus du soulèvement de la membrane de fécondation, ni sur la segmentation des oeufs.2.L'action inhibitrice du liquide coelomique que l'on peut observer souvent est dûe aux substances sécrétées par les parois de l'intestin, dont le contenu se mélange facilement au liquide coelomique lors de l'ouverture du carapace

M. Bogucki

1930-01-01

21

Hydroformylation of Cyclohexene with Carbon Dioxide and Hydrogen Using Ruthenium Carbonyl Catalyst: Influence of Pressures of Gaseous Components  

PubMed Central

Hydroformylation of cyclohexene was studied with a catalyst system of Ru3(CO)12 and LiCl using H2 and CO2 instead of CO in NMP. The influence of H2 and CO2 pressures on the total conversion and the product distribution was examined. It was shown that increasing total pressure of H2 and CO2 promoted the reverse water gas shift reaction and increased the yield of cyclohexanecarboxaldehyde. Its hydrogenation to cyclohexanemethanol was promoted with increasing H2 pressure but suppressed with increasing CO2 pressure. Cyclohexane was also formed along with those products and this direct hydrogenation was suppressed with increasing CO2 pressure. The roles of CO2 as a promoter as well as a reactant were further examined by phase behavior observations and high pressure FTIR measurements.

Fujita, Shin-ichiro; Okamura, Shuhei; Akiyama, Yoshinari; Arai, Masahiko

2007-01-01

22

Tandem isomerization/hydroformylation/hydrogenation of internal alkenes to n-alcohols using Rh/Ru dual- or ternary-catalyst systems.  

PubMed

A one-pot three-step reaction, isomerization/hydroformylation/hydrogenation of internal alkenes to n-alcohols, was accomplished by employing a Rh/Ru dual-catalyst system. By using a combination of Rh(acac)(CO)2/bisphosphite and Shvo's catalyst, (Z)-2-tridecene was converted to 1-tetradecanol in 83% yield with high normal/iso selectivity (n/i = 12). The method was applicable to other internal alkenes, including functionalized alkenes, such as an alkenol and an alkenoate. Furthermore, addition of a third component, Ru3(CO)12, effectively improved the n/i ratio in the tandem isomerization/hydroformylation/hydrogenation of methyl oleate (from n/i = 1.9 to 4.4). Control experiments revealed that the isomerization was mediated by both Rh and Ru and that the coexistence of Rh and Ru was essential for hydrogenation of aldehyde under H2/CO. PMID:24191719

Yuki, Yamato; Takahashi, Kohei; Tanaka, Yoshiyuki; Nozaki, Kyoko

2013-11-20

23

[Rh(?-Cl)(COD)] 2 supported on activated carbons for the hydroformylation of 1-octene: effects of support surface chemistry and solvent  

Microsoft Academic Search

The [Rh(?-Cl)(COD)]2 complex has been heterogeneised on activated carbon and used as catalysts for the hydroformylation of 1-octene. The objective is to achieve the effective anchorage of the complex on the carbon surface, keeping or improving the catalytic properties of the complex in the homogeneous process. The effects of surface chemistry of the activated carbon and the solvent used as

J. A D??az-Auñón; M. C Román-Mart??nez; C Salinas-Mart??nez de Lecea

2001-01-01

24

The hydroformylation of 4-penten-1-ol and 3-buten-1-ol in water with HRh(CO)(TPPTS) 3 and the effects of solution ionic strength  

Microsoft Academic Search

The reaction chemistry and kinetics of the low temperature hydroformylation of the water-soluble substrates, 4-penten-1-ol and 3-buten-1-ol, in aqueous solution utilizing the catalyst HRh(CO)(TPPTS)3 is reported where, TPPTS is trisulphonated triphenylphosphine. The reactions were carried out at relatively low temperature and high stirring rates (1700rpm) to maintain similar rates of mass transfer of gases into the aqueous phase. Activation parameters

Joseph T Sullivan; Jennifer Sadula; Brian E Hanson; Richard J Rosso

2004-01-01

25

PRODUCTION DE LA PATULINE EN MILIEU LIQUIDE PAR DES MOISISSURES APPARTENANT AUX GENRES  

E-print Network

. expansum, 1 of P. claviforme and P. thomii produced patulin after 9 days of culture. Mycotoxin mycotoxine a été trouvée dans des pommes (Harwig et al., 1973), du cidre doux (Scott et al., 1972 ; Wilson et'analyse qualitative et quantitative de la mycotoxine est également effectuée par chromatographie sur couche mince

Paris-Sud XI, Université de

26

A Large Conductivity Change in 2DES on Liquid 4 He Under CR Conditions  

Microsoft Academic Search

We present the first magneto-conductivity measurements on a two-dimensional electron system on liquid4He under cyclotron resonance conditions. The measurements are performed in the temperature region above 1K, where the scattering with helium-gas atoms is the dominant scattering mechanism. We observe a large change in the magnetoconductivity at the resonant magnetic field. When increasing the power of the radiation, we observe

F. C. Penning; O. Tress; H. Bluyssen; P. Wyder

1998-01-01

27

Concurrent synergism and inhibition in bimetallic catalysis: catalytic binuclear elimination, solute-solute interactions and a hetero-bimetallic hydrogen-bonded complex in rh-mo hydroformylations.  

PubMed

Hydroformylations of cyclopentene and 3,3-dimethylbut-1-ene were performed using both Rh(4)(CO)(12) and (eta(5)-C(5)H(5))Mo(CO)(3)H as precursors in n-hexane at 298 K. Both stoichiometric and catalytic hydroformylations were conducted as well as isotopic labeling experiments. Six organometallic pure component spectra were recovered from the high-pressure FTIR experiments, namely the known species Rh(4)(CO)(12), (eta(5)-C(5)H(5))Mo(CO)(3)H, RCORh(CO)(4), and the new heterobimetallic complexes RhMo(CO)(7)(eta(5)-C(5)H(5)), a weak hydrogen bonded species (eta(5)-C(5)H(5))Mo(CO)(3)H-C(5)H(9)CORh(CO)(4), and a substituted RhMo(CO)(7-y)(eta(5)-C(5)H(5))L(y), where y = 1 or 2 and L = (pi-C(5)H(8)). The main findings were (1) catalytic binuclear elimination (CBER) occurs between (eta(5)-C(5)H(5))Mo(CO)(3)H and RCORh(CO)(4) resulting in aldehyde and RhMo(CO)(7)(eta(5)-C(5)H(5)), and this mechanism is responsible for ca. 10% of the product formation; (2) molecular hydrogen is readily activated by the new heterobimetallic complex(es); (3) FTIR and DFT spectroscopic evidence suggests that the weak hydrogen bonded species (eta(5)-C(5)H(5))Mo(CO)(3)H-C(5)H(9)CORh(CO)(4) has an interaction of the type eta(5)-C(5)H(4)-H...O=C; and (4) independent physicochemical experiments for volumes of interaction confirm that significant solute-solute interactions are present. With respect to the efficiency of the catalytic cycle, the formation of a weak (eta(5)-C(5)H(5))Mo(CO)(3)H-C(5)H(9)CORh(CO)(4) complex results in a significant decrease in the measured turnover frequency (TOF) and is the primary reason for the inhibition observed in the bimetallic catalytic hydroformylation. Such hydrogen bonding through the eta(5)-C(5)H(5) ring might have relevance to inhibition observed in other catalytic metallocene systems. The present catalytic system is an example of concurrent synergism and inhibition in bimetallic homogeneous catalysis. PMID:20225878

Li, Chuanzhao; Cheng, Shuying; Tjahjono, Martin; Schreyer, Martin; Garland, Marc

2010-04-01

28

Hydroformylation of olefins and reductive carbonylation of aryl halides with syngas formed ex situ from dehydrogenative decarbonylation of hexane-1,6-diol.  

PubMed

A variety of primary alcohols have been investigated as convenient substrates for the ex situ delivery of carbon monoxide and molecular hydrogen in a two-chamber reactor. The gaseous mixture is liberated in one chamber by an iridium-catalysed dehydrogenative decarbonylation of the alcohol and then consumed in the other chamber in either a rhodium-catalysed hydroformylation of olefins or a palladium-catalysed reductive carbonylation of aryl halides. Hexane-1,6-diol was found to be the optimum alcohol for both reactions where moderate to excellent yields were obtained of the product aldehydes. A relatively low pressure of 1.5-2.4 bar was measured in the closed system during the two transformations. PMID:25410149

Christensen, Stig Holden; Olsen, Esben P K; Rosenbaum, Jascha; Madsen, Robert

2015-01-21

29

Hydroformylation of 1-octene using low-generation Rh(I) metallodendritic catalysts based on a tris-2-(2-pyridyliminoethyl)amine scaffold.  

PubMed

The synthesis and characterization of low-generation pyridylimine Rh(I) metallodendrimers is described. These metallodendrimers were obtained via a Schiff base condensation of tris-2-(aminoethyl)amine with 2-pyridinecarboxaldehyde to afford the tris-2-(2-pyridylimine ethyl) amine ligand (1). Subsequent complexation reactions with [RhCl(CO)(2)](2) and [RhCl(COD)](2) yielded the corresponding metal-containing dendrimers containing -RhCl(CO) and -Rh(COD) moieties on the periphery. These new rhodium metallodendrimers (2 and 3) and their precursor ligand (1) are thermally stable and have been characterized using (1)H NMR, (13)C NMR, (31)P NMR, FT-IR spectroscopy, elemental analysis as well as mass spectrometry. The Rh(I) metallodendrimers are highly active and chemo- and regioselective in the hydroformylation of 1-octene. Aldehydes were favoured at moderate to high temperatures (95 °C and 75 °C) and pressure (30 bars), while more iso-octenes were formed at low temperature (55 °C) and pressures (5 and 10 bars). The mononuclear analogues (5 and 6) also produced more aldehydes (albeit showing catalyst decomposition at 95 °C and 75 °C, 30 bars) and these aldehydes were mostly branched. PMID:22847737

Makhubela, Banothile C E; Jardine, Anwar M; Westman, Gunnar; Smith, Gregory S

2012-09-21

30

Astronomie avec Miroirs Liquides  

NASA Astrophysics Data System (ADS)

Cette thèse démontre que la technologie des miroirs liquides a atteint une maturité qui permet de l'appliquer à la recherche astronomique. Les télescopes à miroir liquide offrent des images astronomiques de qualité comparable à celle des télescopes conventionels utilisés dans des conditions similaires. La première partie de la thèse présente le premier télescope a miroir liquide dédié à la recherche astronomique: le 2,7 m de University of British Columbia-Université Uval (UBC-UL). Elle donne également les renseignements techniques utiles pour l'exploitation des télescopes à miroir liquide en milieu extérieur. La deuxième partie de la thèse analyse les données de la saison 1996 du télescope à miroir liquide de 3 m du NASA Orbital Debris Observatory (NODO). Une comparaison avec les observations effectuées avec des télescopes conventionels, publiées dans la littérature, démontre la bonne qualité des données du NODO. Une recherche d'objets particuliers, parmi les 20 000 objets répertoriés pendant la saison 1996, démontre le potentiel des miroirs liquides pour les projets d'astronomie demandant de grandes surfaces collectrices sur de longues périodes de temps.

Cabanac, Remi Andre

31

Full Size Testing of Drainage Systems for Burning Liquids in Road Didier Lacroix, Research Manager, Centre d'Etudes des Tunnels, Bron / Dr. Eric Casale, Scetauroute,  

E-print Network

ejection speed; - The second zone is determined by the gradient, the transverse slope and the surface-Rhin-Rhöne, Frankreich 1. Introduction Most vehides transporting dangerous substances on road are liquid hydrocarbon into a collec- tor through 50-100 m spaced gully holes. In order to improve absorption for dangerous substances

Paris-Sud XI, Université de

32

Liquid-liquid equilibria for the ternary system (phosphonium based deep eutectic solvent-benzene-hexane) at different temperatures: A new solvent introduced  

Microsoft Academic Search

In this work we studied the applicability of one ionic liquid analogues namely phosphonium based deep eutectic solvent (DES) in the extraction of aromatic hydrocarbons from aromatic\\/aliphatic mixtures. Experimental data for liquid-liquid equilibria (LLE) were obtained for various mixtures of (benzene. +. hexane. +. DES) at 27, 35 and 45 °C. Some of the mixtures showed excellent results in terms

Mukhtar A. Kareem; Farouq S. Mjalli; M. A. Hashim; Inas M. AlNashef

2012-01-01

33

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

34

La cessation d’activité au sein des couples : y-a-t-il interdépendance des choix ? Suivi d'un commentaire d’Antoine Bommier  

Microsoft Academic Search

[fre] La cessation d’activité au sein des couples: y a-t-il interdépendance des choix? . . Dans la plupart des modèles de choix de départ à la retraite, la liquidation des droits est analysée comme le résultat d’un arbitrage individuel entre consommation et loisir: elle ne prend pas en compte la présence d’un conjoint. Or, plusieurs facteurs pourraient générer une interdépendance

Béatrice Sédillot; Antoine Bommier; Emmanuelle Walraet

2002-01-01

35

Des Moines.  

ERIC Educational Resources Information Center

This document, intended for elementary students, contains articles and activities designed to acquaint young people with the history of Des Moines, Iowa. The articles are short, and new or difficult words are highlighted and defined for young readers. "The Raccoon River Indian Agency" discusses the archeological exploration of the indian…

Gore, Deborah, Ed.

1988-01-01

36

Structure des ADN complmentaires des lactoprotines : application la recherche des gnes et leur localisation chromosomique  

E-print Network

Structure des ADN complémentaires des lactoprotéines : application à la recherche des gènes et à entrepris. 1) Construction de banques ovine et bovine d ADN complémentaires !ADNcJ. Sélection et identification des clones recombinants contenant les ADN complé- mentaires des ARNm des 6 principales

Paris-Sud XI, Université de

37

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

38

Comptes Rendus des JNC 17 -Poitiers 2011 Simulation par lments finis des procds par infusion de rsine  

E-print Network

Comptes Rendus des JNC 17 - Poitiers 2011 Simulation par éléments finis des procédés par infusion de résine Finite Simulation of the liquid infusion processes G. Pacquaut, J. Bruchon, N. Moulin, S permettant de simuler par éléments finis les procé- dés par infusion de résine au travers de renforts fibreux

Paris-Sud XI, Université de

39

FERTILIT DES BREBIS TRAITES AVEC DE L'ACTATE DE FLUOROGESTONE  

E-print Network

synchronisation des œstrus par traitement progestatif. Or, cette synchronisation facilite l'utilisation de l. Celles-ci étaient placées horizonta- lement au-dessus du niveau de l'azote liquide pendant sept minutes

Paris-Sud XI, Université de

40

Expression des constantes de distorsion centrifuge des hexafluorures en fonction des frquences harmoniques.  

E-print Network

L-55 Expression des constantes de distorsion centrifuge des hexafluorures en fonction des de distorsion centrifuge des molécules XY6 en fonc- tion des fréquences harmoniques ; l for the centrifugal distortion constants as a function of harmonic frequencies ; application is made to SF6 and UF6. 4

Paris-Sud XI, Université de

41

STRUCTURE OF A HYBRID ALIGNBD CHOLESTERIC LIQUID CRYSTAL CELL I. DOZOV and I. PENCHEV  

E-print Network

373 STRUCTURE OF A HYBRID ALIGNBD CHOLESTERIC LIQUID CRYSTAL CELL I. DOZOV and I. PENCHEV Institute'un crystal liquide cholestérique est étu- diée expérimentalement et théoriquement. Pour des petites. Abstract.- The structure of a hybrid ali- gned cholesteric liquid crystal sample is investigated both

Boyer, Edmond

42

Structural transition at the free surface of the nematic liquid crystals MBBA and EBBA  

E-print Network

1061 Structural transition at the free surface of the nematic liquid crystals MBBA and EBBA P on the bulk properties of nematic liquid crystals, so that these properties are now well understood [1, 2'angle 03B8t entre le directeur et la normale à la surface libre des cristaux liquides nématiques MBBA et

Boyer, Edmond

43

Flexoelectric effects in ferroelectric liquid crystals ? Ph. Martinot-Lagarde and G. Durand  

E-print Network

L-43 Flexoelectric effects in ferroelectric liquid crystals ? Ph. Martinot-Lagarde and G. Durand* liquid crystal does not contribute at all to the static dielectric constant in the ferroelectric phase la polarisation spontanée électrique des cristaux liquides smectique C* ne joue aucun rôle dans la

Boyer, Edmond

44

DES Supernova Results  

NASA Astrophysics Data System (ADS)

The Dark Energy Survey Supernova program (DES SN) will discover approximately 3500 Type Ia supernovae with well-sampled multi-color light curves in the redshift range 0.2 < z < 1.2 over its five year duration. The large field of view and high z-band sensitivity of the Dark Energy Camera, combined with the precision photometry of DES and an improved handling of systematic uncertainties will allow DES SN to provide the strongest constraints on supernova cosmology to date. One of the main challenges for DES SN will be accurate classification of such a large number of faint transients. I will describe the unique spectroscopic follow-up strategy that we are employing, with emphasis on the 100 night, survey-status program at AAT which began in September. I will present preliminary supernova results obtained from the DES Science Verification period and the beginning of DES Year 1.

D'Andrea, Christopher; Dark Energy Survey, The

2014-01-01

45

Médecine des voyages  

PubMed Central

Résumé Objectif Définir la pratique de la médecine des voyages, présenter les éléments fondamentaux d’une consultation complète préalable aux voyages à des voyageurs internationaux et aider à identifier les patients qu’il vaudrait mieux envoyer en consultation auprès de professionnels de la médecine des voyages. Sources des données Les lignes directrices et les recommandations sur la médecine des voyages et les maladies liées aux voyages publiées par les autorités sanitaires nationales et internationales ont fait l’objet d’un examen. Une recension des ouvrages connexes dans MEDLINE et EMBASE a aussi été effectuée. Message principal La médecine des voyages est une spécialité très dynamique qui se concentre sur les soins préventifs avant un voyage. Une évaluation exhaustive du risque pour chaque voyageur est essentielle pour mesurer avec exactitude les risques particuliers au voyageur, à son itinéraire et à sa destination et pour offrir des conseils sur les interventions les plus appropriées en gestion du risque afin de promouvoir la santé et prévenir les problèmes médicaux indésirables durant le voyage. Des vaccins peuvent aussi être nécessaires et doivent être personnalisés en fonction des antécédents d’immunisation du voyageur, de son itinéraire et du temps qu’il reste avant son départ. Conclusion La santé et la sécurité d’un voyageur dépendent du degré d’expertise du médecin qui offre le counseling préalable à son voyage et les vaccins, au besoin. On recommande à ceux qui donnent des conseils aux voyageurs d’être conscients de l’ampleur de cette responsabilité et de demander si possible une consultation auprès de professionnels de la médecine des voyages pour tous les voyageurs à risque élevé.

Aw, Brian; Boraston, Suni; Botten, David; Cherniwchan, Darin; Fazal, Hyder; Kelton, Timothy; Libman, Michael; Saldanha, Colin; Scappatura, Philip; Stowe, Brian

2014-01-01

46

EVALUATION DE LA DETECTION DES EMOTIONS, OPINONS OU SENTIMENTS Evaluation de la dtection des motions, des opinions ou des sentiments  

E-print Network

EVALUATION DE LA DETECTION DES EMOTIONS, OPINONS OU SENTIMENTS Evaluation de la détection des émotions, des opinions ou des sentiments : dictature de la majorité ou respect de la diversité d'opinion et analyse des sentiments sont généralement évalués par comparaison des réponses du système concerné

Paris-Sud XI, Université de

47

Amputation des quatre membres  

PubMed Central

Les auteurs présentent les cas d'amputation des quatre membres réalisée chez trois patients différents. Ce sont des amputations réalisées pour chaque patient au cours d'une seule hospitalisation et en un seul temps opératoire. Deux patients pour gangrène sèche infectée et un pour amputation traumatique des quatre membres. L'amputation d'urgence a été pratiquée en premier temps suivie de remodelage des moignons d'amputation en second temps. L’évolution de tous les patients a été bonne. PMID:25469177

Feruzi, Maruis Kitembo; Milindi, Cédrick Sangwa; Zabibu, Mireille Kakinga; Mulefu, Jules Panda; Katombe, Francois Tshilombo

2014-01-01

48

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

49

Nouvelles methodes numeriques pour l'analyse sismique des reservoirs de liquide: Effets de l'asymetrie, du ballottement en surface libre et de blocs de glace en flottaison  

NASA Astrophysics Data System (ADS)

This work proposes a semi-analytical method to calculate the dynamical response of symmetric and asymetric rectangular liquid containing structures in two dimensional space. The proposed method is based on the substructure method and can take account of the flexibility of each wall independantly, the compressibility of the liquid, a radiation condition at the tank bottom, the sloshing of the liquid surface and allows to take account of a more general condition of floating masses such as ice-blocks. The method uses the finite element technique to compute the natural modes of the dry structure and deals with the fluid potential by solving the boundary value problem. The method is limited to small changes, and employs Airy linear theory for modeling the sloshing problem. The proposed technique has been programmed and validated using the finite element method for several numerical examples. It provided an opportunity to highlight the amplifying effect of an ice cover on the response of the fluid and the structure.

Goulmot, Damien

50

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

51

Rpertoire des emplois en janvier 2011 des diplms de Master  

E-print Network

Répertoire des emplois en janvier 2011 des diplômés de Master Promotion 2008 Le répertoire des (CTU / UFR SLHS) - Education et promotion sanitaires et sociales, prévention des risques (CTU normes (UFR SLHS) - Sports et sociétés (UPFR sports) OFVE, 2011 - Page 2 #12;- Domaine Sciences, Santé

Jeanjean, Louis

52

Plan de cours Facult des arts et des sciences  

E-print Network

familiarisé avec les structures et les types d'organisation des Protistes, des Mycètes, des Algues et des eucaryotes Stramenopila (algues brunes, diatomées et oomycètes) 13 mai 3 Les protozoaires 14 mai 4 Les champignons, Les Lichens et Mycorhizes 20 mai 5 Myxomycota, Dyctiosteliomycota, Algues rouges et vertes 21 mai

Parrott, Lael

53

Politique de gestion des documents administratifs et des archives  

E-print Network

Politique de gestion des documents administratifs et des archives Préparation : Division de la gestion des documents administratifs et des archives Révision : Bureau du secrétaire général Entrée en vigueur : 15 février 2012 Approbation : (CA-2012-6) Cadre juridique : Loi sur les archives (L

54

Des cartographies de connaissances pour un pilotage des ressources humaines  

E-print Network

Des cartographies de connaissances pour un pilotage des ressources humaines et des processus RH'apport de la prospective : Mélanges en l'honneur de Luc Boyer (2010) xx-xxi" #12;Des cartographies de'organisation. Les cartographies de connaissances, parce qu'elles permettent l'identification et la représentation de

Paris-Sud XI, Université de

55

Metabolism of Genipin in Rat and Identification of Metabolites by Using Ultraperformance Liquid Chromatography/Quadrupole Time-of-Flight Tandem Mass Spectrometry.  

PubMed

The in vivo and in vitro metabolism of genipin was systematically investigated in the present study. Urine, plasma, feces, and bile were collected from rats after oral administration of genipin at a dose of 50?mg/kg body weight. A rapid and sensitive method using ultraperformance liquid chromatography coupled with electrospray ionization quadrupole time-of-flight tandem mass spectrometry (UPLC-Q/TOF MS) was developed for analysis of metabolic profile of genipin in rat biological samples (urine, plasma, feces, and bile). A total of ten metabolites were detected and identified by comparing their fragmentation patterns with that of genipin using MetaboLynx software tools. On the basis of the chromatographic peak area, the sulfated and glucuronidated conjugates of genipin were identified as major metabolites. And the existence of major metabolites G1 and G2 was confirmed by the in vitro enzymatic study further. Then, metabolite G1 was isolated from rat bile by semipreparative HPLC. Its structure was unambiguously identified as genipin-1-o-glucuronic acid by comparison of its UV, IR, ESI-MS, (1)H-NMR, and (13)C-NMR spectra with conference. In general, genipin was a very active compound that would transform immediately, and the parent form of genipin could not be observed in rats biological samples. The biotransformation pathways of genipin involved demethylated, ring-opened, cysteine-conjugated, hydroformylated, glucuronidated, and sulfated transformations. PMID:23573161

Ding, Yue; Hou, Jian-Wei; Zhang, Yong; Zhang, Li-Ying; Zhang, Tong; Chen, Yi; Cai, Zhen-Zhen; Yang, Li

2013-01-01

56

Liquid nitrogen  

MedlinePLUS

Liquid nitrogen is a chemical that is super cold, about -200 degrees Celsius. Liquid nitrogen will instantly freeze anything it touches. It is used to kill cells that make up diseased or cancerous tissue. Tissue that has been frozen dries out and falls off.

57

Eléments de comparaison internationale des patrimoines des ménages  

Microsoft Academic Search

[fre] A partir des bribes d'information existant sur les patrimoines de divers pays européens et des USA, une comparaison de la structure des patrimoines des inégalités de répartition et de leur évolution est tentée. Actifs financiers et actifs réels figurent de façon variable dans les patrimoines des différents pays. La Grande-Bretagne, avec une forte part d'actifs financiers, notamment de valeurs

Dominique Strauss-Kahn

1979-01-01

58

Liquid pearls  

E-print Network

This fluid dynamics video reports how to form liquid core capsules having a thin hydrogel elastic membrane named liquid pearls. These fish-egg like structures are initially made of a millimetric liquid drop, aqueous or not, coated with an aqueous liquid film containing sodium alginate that gels once the double drop enters a calcium chloride bath. The creation of such pearls with micrometer thick membrane requires to suppress mixing until gelling takes place. Here, we show that superimposing a two dimensional surfactant precipitation at the interface confers a transient rigidity that can damp the shear induced instability at impact. Based on this, pearls containing almost any type of liquids can be created. The video focuses on the dynamics of the entry of the compound drop into the gelling bath.

Bremond, Nicolas; Bibette, Jérôme

2010-01-01

59

Contribution aux Methodes Analytiques des Substances a L'aide de Faisceaux de Particules Chargees  

NASA Astrophysics Data System (ADS)

Nous avons vu les possibilites d'analyse par particules chargees des aerosols recueillis sur des filtres de type MILLIPORE. La meme technique a ete utilisee pour des filtres ayant servi a la filtration de l'eau du fleuve Saint-laurent. Deux techniques ont ete utilisees: (1) FAST (Forward Alpha Scattering Technique): pour analyser l'hydrogene, le carbone, l'oxygene et puis l'azote. Des alpha de 12 MeV ont ete utilises. (2) PIXE (Particle Induced X-ray Emission): pour analyser les elements moyens et lourds, dans ce cas des protons de 3 MeV ainsi que des ions d'argon de 1 et 1.6 MeV ont ete utilises. Les etudes ont montre que sous vide, la majorite des problemes proviennent des dommages causes par l'echauffement du a l'impact du faisceau sur le filtre. L'analyse quantitative par l'intermediaire du faisceau extrait peut presenter des difficultes en ce qui concerne les elements legers pour lesquels l'absorption des rayonnements caracteristiques dans l'atmosphere externe est importante. Les ions lourds se pretent mal aux analyses des aerosols du fait de leur limite de sensibilite. L'analyse directe de liquides par des protons est particulierement interessante puisqu'elle ne necessite aucune preparation prealable des echantillons. A cet effet, un programme de calcul de concentration des elements dans la solution a analyser a ete mis au point. Nous avons determine la limite de sensibilite de la methode PIXE pour les cibles minces (filtre) et pour le cas ou la matrice est de l'eau. Enfin, la technique FAST peut etre un complement de la technique PIXE.

Saidi, Abdelmajid

60

Archives participatives Au milieu des ralisations remarquables de mdiation numrique des bibliothques et des  

E-print Network

Archives participatives Au milieu des réalisations remarquables de médiation numérique des bibliothèques et des musées sur les médias sociaux, les services d'archives ont un positionnement relativement en revanche des projets ambitieux de crowdsourcing, d'« archives participatives » (voir encart

Paris-Sud XI, Université de

61

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

62

Ionic Liquids  

Microsoft Academic Search

Ionic liquids are receiving an upsurge of interest as green solvents; primarily as replacements for conventional media in\\u000a chemical processes. This review presents an overview of the chemistry that has been developed utilising ionic liquids as either\\u000a catalyst and\\/or solvent, with particular emphasis on processes that have been taken beyond the pre-competetive laboratory\\u000a stage and represent clean industrial technology with

J. D. Holbrey; K. R. Seddon

1999-01-01

63

[Are liquid crystals living organisms?].  

PubMed

In 1888 the Austrian botanist F. Reinitzer made the observation that the solid compound cholesteryl-benzoate changes - when melting at 145.5 oC - into a cloudy liquid, that however, turns into a clear liquid at 178.5 oC and higher temperatures. The cloudy liquid seemed to be doubly refracting. Soon a number of these so-called 'liquid crystals' were discovered; in 1908 D. Vorländer, professor of organic chemistry at Halle, described more than 250 of these substances. It was O. Lehmann, professor of physics at Aachen (1885), Dresden (1888) and Karlsruhe (1889), who immediately after Reinitzer's observation began a systematic study of these liquid crystals. In The Netherlands the Amsterdam professor of physican chemistry H. W. Bakhuis Roozeboom was interested in liquid crystals, in particular because of their place in his phase system. F.M. Jaeger, at that time teaching chemistry in a secondary school in Zaandam (near Amsterdam) and working as an unpaid university lecturer at the Amsterdam university (by recommendation of Bakhuis Roozeboom), investigated liquid crystals (1906), as did a number of doctoral students (A.C. de Kock, 1903; A. Prins, 1907). At the university of Utrecht L.S. Ornstein, professor of physics, gave the study of liquid crystals a prominent place in his research programme. The discovery of liquid crystals, which seemed to be able to grow, move, divide, copulate, and so on, led to a discussion on the nature of these substances. Time and again Lehmann called them 'apparently living crystals', although without considering them as 'real living beings'. In his book Flüssige Kristalle und die Theorien des Lebens (1906), Lehmann proved to be an obvious adherent of the monistic views of the biologist E. Haeckel. Haeckel considered the existence of liquid crystals as proof of the unity between the inorganic and the organic world that he believed in so strongly. In his last book, Kristallseelen. Studien über das Anorganische Leben (1917), he considered liquid crystals a real form of life, as did F. Rinne, professor of mineralogy and petrography, as late as in the nineteen thirties. PMID:11625121

Snelders, H A

1997-01-01

64

un cristal, des rseaux  

E-print Network

décrypter les matériaux du patrimoine. Le jaune chrome/plomb des tournesols de Van Gogh Certaines parties du tableau de van Gogh, « Fleurs dans un vase bleu » peint en 1887, ont changé de couleur au cours du temps/Université d'Anvers - Musée Van Gogh un cristal, des réseaux à l'upmc Voir l'article en ligne Site du

Arleo, Angelo

65

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

66

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

67

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

68

La biogenèse des mélanosomes  

PubMed Central

Les mélanocytes situés à la base de l’épiderme produisent des mélanosomes qui sont transférés aux kératinocytes pour assurer la pigmentation de l’épiderme et sa photoprotection contre les rayons ultraviolets. Les mélanosomes, organites apparentés aux lysosomes, sont le lieu de synthèse et de stockage d’un pigment, la mélanine. Leur formation dépend de protéines mélanosomales qui transitent par les voies de biosynthèse et d’endocytose et exploitent les mécanismes moléculaires du trafic intracellulaire. Les acteurs moléculaires impliqués dans le transport des protéines mélanosomales et la biogenèse des mélanosomes sont la cible de mutations dans des maladies génétiques accompagnées d’hypopigmentation comme l’albinisme et les maladies lysosomales. Les études menées sur les mélanocytes issus de souris modèles de ces maladies permettent de comprendre certaines des étapes-clés de la mélanogenèse ainsi que les dysfonctionnements associés à ces pathologies. De plus, décrypter la mélanogenèse facilite également la compréhension d’autres processus physiologiques, comme l’illustrent les similitudes inattendues avec l’amyloïdogenèse dans les maladies neurodégénératives. PMID:21382323

Delevoye, Cédric; Giordano, Francesca; van Niel, Guillaume; Raposo, Graça

2012-01-01

69

Septembre 2012 Paludisme : des moustiques  

E-print Network

pulvérisations intra domiciliaires d'autres insecticides, les carbamates. Ces derniers agissent différemment au aux pyré- thrinoïdes et pulvérisé des carbamates à l'intérieur des habitations, les scientifiques ont

70

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

71

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

72

Behandlung der Pseudarthrosen des Beckens  

Microsoft Academic Search

Pseudarthrosen des Beckenringes sind selten. Leitsymptom ist der chronische belastungsabhängige Schmerz des Beckenrings. Es muss überprüft werden, ob der Symptomenkomplex durch eine Pseudarthrose, durch eine posttraumatische Fehlstellung oder durch die Kombination von beiden verursacht ist. Diagnostisch wichtig sind die körperliche Untersuchung des ausgezogenen Patienten, Provokationstests, Röntgen (Beckenübersichts-, Inlet-, Outlet-, Ala- und Obturatoraufnahme) sowie die für die Analyse von Fehlstellungen, Instabilitäten

I. Marintschev; T. Mückley; F. Mendler; G. O. Hofmann

2005-01-01

73

Antiferroelectric surface layers in a liquid crystal as observed by synchrotron X-ray scattering  

E-print Network

711 Antiferroelectric surface layers in a liquid crystal as observed by synchrotron X crystal with terminally polar (cyano substituted) molecules has been studied using a high'un cristal liquide dont les molécules ont des groupes terminaux polaires (cyano-);l'instrument est un

Boyer, Edmond

74

Échantillonnage des gisements kimberlitiques à partir des microdiamants : Application à l'estimation des ressources récupérables.  

E-print Network

??La prédiction des ressources récupérables d'un gisement kimberlitique passe par l'estimation de la loi en taille des diamants commercialisables qu'il contient. Cette estimation repose traditionnellement… (more)

Ferreira, Johannes

2013-01-01

75

Layered Liquids  

NSDL National Science Digital Library

This activity involves an exploration of density. Why does oil float on water? How does drain cleaner sink down into the clogged pipe right through standing water? These questions will be answered as students make a layered "parfait" of colored liquids ba

Eichinger, John

2009-05-30

76

La structure de l'eau liquide: Une etude thermique par spectroscopie infrarouge  

NASA Astrophysics Data System (ADS)

Le probleme de la structure de l'eau liquide est important car l'eau est le liquide le plus present sur Terre, et complexe, la quete d'un modele precis pour decrire comment fonctionne ce liquide ayant debute des la fin du dix-neuvieme siecle. Cette etude aborde ce probleme en etudiant l'effet de l'augmentation de la temperature sur H2O et D 2O purs a l'aide de la spectroscopie infrarouge. L'intervalle de temperatures scrute est 29--93.1°C. Les spectres enregistres sont des spectres MIR-ATR entre 650 et 6000 cm-1 . L'analyse par facteurs de ces donnees permet de montrer que deux et seulement deux facteurs principaux sont necessaires pour decomposer tous les spectres experimentaux. Ces resultats sont confirmes grace a l'analyse par facteurs de spectres de la region FIR. Par la suite, la transformation en spectres de la partie reelle n et imaginaire k de l'indice de refraction permet de combiner les donnees des regions MIR et FIR. Une fois ce calcul termine, les spectres de transmission complets de H 2O et D2O entre 25 et 90°C sont connus. Ils sont ensuite utilises pour calculer par extrapolation le spectre des especes constituant l'eau liquide, puis leur abondance en fonction de la temperature. L'extrapolation de ces abondances montre que les especes correspondent a des temperatures limites de --18 et 122°C. Par la suite, la decomposition gaussienne des spectres d'especes met en evidence la riche structure de ces objets et permet de demontrer que l'apparent deplacement du massif d'absorption OH (OD) est produit par une variation de l'intensite des bandes et non pas de leur deplacement. L'examen attentif des spectres des especes prouve qu'il n'y a pas de OH libres crees par l'augmentation de la temperature: meme a 93.1°C, chaque molecule possede quatre liens-H. Ces conclusions sont de plus confirmees par une analyse thermodynamique du passage des molecules de la phase solide a la phase gazeuse. Pour diversifier la nature des resultats experimentaux utilises, des mesures de diffraction des rayons X ont aussi ete analysees. Les abondances tirees de l'analyse par facteurs des spectres infrarouges permettent de calculer les fonctions de distributions radiales des deux especes. Ces fonctions offrent la possibilite de connaitre les distances relatives entre les atomes. Avec ces distances en main, l'architecture des deux especes peut etre schematisee. Ces resultats originaux, combines a ceux issus de la spectroscopie infrarouge, permettent de montrer que la premiere espece est bien organisee, c'est-a-dire que le cube defini par un atome d'oxygene et les quatre autres atomes d'oxygene avec lesquels il est en liens-H est regulier, alors que pour l'espece chaude, les dimensions du cubes sont irregulieres. La comparaison entre les deux especes montre qu'elles etablissent toujours quatre liens-H et que leurs differences resident uniquement dans la geometrie des cubes. Finalement, deux hypotheses sont formulees comme fondement d'un modele de la structure de l'eau liquide. Premierement, l'empilement des cubes des deux especes permet de representer l'eau a toutes les temperatures, l'espece froide etant garante de la stabilite du liquide, alors que l'espece chaude a un effet destabilisant; et deuxiemement, le saut du proton stabilise les liens-H, de telle sorte que lorsque l'espece chaude devient trop abondante, ces defauts provoquent un arret des sauts de protons et les liens-H ainsi affaiblis se brisent et le liquide s'evapore.

Larouche, Pascal

77

Facult des arts et des sciences cole de bibliothconomie et des sciences de l'information  

E-print Network

Faculté des arts et des sciences �cole de bibliothéconomie et des sciences de l'information COMMUNIQU� POUR DIFFUSION IMM�DIATE Aïda Chebbi, nouvelle docteure en sciences de l'information Montréal, le 26 février 2013 - L'�cole de bibliothéconomie et des sciences de l'information (EBSI) de l

Parrott, Lael

78

Facult des arts et des sciences cole de bibliothconomie et des sciences de l'information  

E-print Network

Faculté des arts et des sciences �cole de bibliothéconomie et des sciences de l'information POURQ. Montréal, le 17 octobre 2014 -- L'�cole de bibliothéconomie et des sciences de l'information (EBSI) de l aux missions de BAnQ. Madame Majela Guzmán Gómez réalise actuellement son doctorat en sciences de l'information

Parrott, Lael

79

Facult des arts et des sciences cole de bibliothconomie et des sciences de l'information  

E-print Network

Faculté des arts et des sciences �cole de bibliothéconomie et des sciences de l'information POUR l'information à l'EBSI Montréal, le 18 février 2014 -- L'�cole de bibliothéconomie et des sciences première �cole d'été internationale de la Francophonie en sciences de l'information, du 2 au 11 juillet

Leclercq, Remi

80

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

81

des ateliers artistiques  

E-print Network

trompe-l'oeil... Des peaux brûlées en mal d'amour et de repères dans un monde ordinaire, étouffant'est-ce pas la même chose dans une histoire d'amour ? du 10 au 21 juin exposition de l'Atelier photo paris 6

82

Obtaining polarized liquid helium 3 from optically oriented gas G. Tastevin, P.J. Nacher, L. Wiesenfeld*, M. Leduc and F. Lalo  

E-print Network

1 Obtaining polarized liquid helium 3 from optically oriented gas G. Tastevin, P.J. Nacher, L suivre le mouvement de liquide qui coule le long des parois de la cellule. Abstract.2014 Spin polarized liquid helium three can be obtained by liquefaction of a gas polarized by laser optical pumping. We show

Paris-Sud XI, Université de

83

Quelques propriétés des théories de Jonsson  

Microsoft Academic Search

On étudie les propriétés des théories de Jonsson et des conditions nécessaires afin que des théories soient de Jonsson ; on caractérise les théories de Jonsson cosémantiques c’est-à-dire ayant un modèle homogène universel commun ainsi que certaines théories complètes contenant des théories de Jonsson. On donne des exemples de certaines situations.

Yerulan Mustafin

2002-01-01

84

fevrier 2012 Journes Francophones des Langages Applicatifs JFLA12 Separation des couleurs dans un -calcul bichrome  

E-print Network

AlligatorEggs3 cherche `a expliquer le -calcul `a des enfants. Pour cela il utilise la couleur pour relier des alligators affam´es et des oeufs afin de constituer des familles. La couleur sert `a expliciter les liaisons des variables dans les termes, des oeufs naissent de nouveaux alligators ou familles lors

Paris-Sud XI, Université de

85

Liquid electrode  

DOEpatents

A dropping electrolyte electrode is described 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. 2 figures.

Ekechukwu, A.A.

1994-07-05

86

Geschichte des Widerstandes in Film und Fernsehen.  

E-print Network

??In der Diplomarbeit „Geschichte des Widerstandes in Film und Fernsehen“ wird die unterschiedliche Darstellungsweise des Stauffenberg-Attentats auf den „Führer“ Adolf Hitler vom 20. Juli 1944… (more)

Bauer, Marlies

2010-01-01

87

TIC et commerce lectronique : laboratoires de la libralisation des changes et des volutions des rgles  

E-print Network

1 TIC et commerce électronique : laboratoires de la libéralisation des échanges et des évolutions/Département Sciences Economiques et Sociales Les échanges internationaux de produits TIC et le commerce électroniques à terme à l'abolition des droits de douane pour les produits de la filière TIC et les échanges

Paris-Sud XI, Université de

88

Localisation des salles UFR SLHS : Facult des Lettres  

E-print Network

Promotion Formation Recherche des Sports 31 rue de l'épitaphe, 25000 Besançon IUT: Institut Universitaire de'Observatoire 25000 Besançon UFR ST : Faculté des Sciences 16 route de Gray, 25000 Besançon UPFR Sports : Unité de

Jeanjean, Louis

89

UNIVERSIT DE NANTES FACULT DES SCIENCES ET DES TECHNIQUES  

E-print Network

épineux des DSSC. J'associe aussi à ces remerciements Yann Pellegrin et Errol Blart, qui ont été des personnes très sympathiques à rencontrer et qui ont rendus les réunions "DSSC" plus agréables, entre autre

Paris-Sud XI, Université de

90

Instabilits hydrodynamiques des liquides magntiques miscibles et non miscibles  

E-print Network

). · "Very active" scalar: concentration or density gradients generate mechanical Korteweg stresses. Under;Experimental background: Transient optical gratings in magnetized ferrofluids Effective diffusion coefficient dispersion; ) · Active scalar, . Non-Poiseuille velocity profiles. The isolines of concentration across

91

Facult des arts et des sciences cole de bibliothconomie et des sciences de l'information  

E-print Network

Faculté des arts et des sciences �cole de bibliothéconomie et des sciences de l'information -- L'�cole de bibliothéconomie et des sciences de l'information (EBSI) de l'Université de Montréal est destinée aux étudiants de doctorat ou de maîtrise en sciences de l'information qui démontrent un intérêt

Parrott, Lael

92

Liquid Crystal Inquiries.  

ERIC Educational Resources Information Center

Discusses the properties and classification of liquid crystals. Presents a simple experiment that illustrates the structure of liquid crystals and the differences between the various phases liquid crystals can assume. (JRH)

Marroum, Renata-Maria

1996-01-01

93

Lacerations - liquid bandage  

MedlinePLUS

Skin adhesives; Tissue adhesive ... the cut is minor, a liquid bandage (liquid adhesive) can be used on the cut to close ... bandage is quick and painless to apply. Skin adhesives, or liquid bandages, seal the cut closed after ...

94

What Is A Liquid?  

NSDL National Science Digital Library

The representation is an animation of the molecular motion of liquid and gaseous bromine. The motion of the atoms of liquid argon and the molecular motion of liquid water are shown as well. Descriptive information accompanies the animation.

95

Ageismus – Sprachliche Diskriminierung des Alters  

Microsoft Academic Search

Daniel Sanders, einer der bedeutendsten Lexikografen des 19. Jahrhunderts, wertete für sein Wörterbuch Quellen seit der Lutherzeit aus und\\u000a vermerkt im Wörterbuchartikel zu alt eine „bald lobende, bald tadelnde“ Bedeutung des Adjektivs. Sein Zeit- und Berufsgenosse Jacob Grimm benennt in seiner Rede über das Alter die zeitgenössischen Synonyme zu alt und Alter: „aus einheimischen schriftstellern liesze sich eine lange reihe

Undine Kramer

96

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

97

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

98

Liquid supercoiling  

NASA Astrophysics Data System (ADS)

Supercoiling is defined as the large-scale secondary coiling of a slender body that is already coiled at a smaller scale (e.g., telephone cords and DNA strands). We demonstrate experimentally a novel fluid-mechanical form of supercoiling that occurs in the context of the familiar ``liquid rope coiling'' instability of a thin thread of viscous fluid falling onto a rigid surface. Under appropriate conditions, the coiling instability generates a tall pile of coils in the form of a hollow cylindrical column, which in turn becomes unstable to a secondary coiling instability with a frequency 10% of the primary one. To place this phenomenon in a broader context, we determine experimentally the phase diagram for the different possible behaviors of the thread (stagnation flow, simple coiling, rotatory folding, periodic column collapse, supercoiling) in the space of the fluid viscosity, the flow rate, and the fall height. We formulate a mathematical model for supercoiling by combining a thin-shell description of the column wall with a slender-thread description of the column as a whole. This leads to a set of coupled ordinary differential equations in one space dimension (the arclength along the axis of the coiling column) that we solve numerically using a continuation method. A comparison of the predicted and observed frequencies of secondary coiling will be shown.

Ribe, Neil; Habibi, Mehdi; Hosseini, Hossein; Hassan Khatami, Mohammad

2011-11-01

99

Gntique formelle des pigmentations humaines variations continues  

E-print Network

Génétique formelle des pigmentations humaines à variations continues : beaucoup d'hypothèses, peu et de mesures sont actuellement disponibles concer- nant la biochimie des pigments humains, leur génétique physiologique, les répartitions mondiales des pigmentations de la peau et des cheveux. La

Boyer, Edmond

100

Les revenus primaires des ménages en 1975  

Microsoft Academic Search

[fre] Tous les 5 ans environ, l'INSEE procède à une enquête sur les revenus des ménages en utilisant les déclarations fiscales de la Direction générale des impôts. Les premiers résultats de 1975 sont à présent disponibles. Malgré la diversité des critères d'inégalité (revenu par ménage, par tête ou par unité de consommation), une réduction progressive des écarts se fait jour,

André Villeneuve

1978-01-01

101

Patrimoine des ménages : déterminants et disparités  

Microsoft Academic Search

[fre] Patrimoine des ménages : déterminants et disparités . En 1992, le patrimoine brut des ménages est, en moyenne, de 900 000 francs. Mais la dispersion et la concentration sont fortes : le pécule des 10 % de ménages les moins fortunés ne dépasse pas 24 600 francs, alors que l'avoir des 10 % les plus riches excède 1 830

Daniel Verger; Stéfan Lollivier

1996-01-01

102

CARTOGRAPHIE DES ACCIDENTS GOLOGIQUES PAR IMAGERIE  

E-print Network

119 CARTOGRAPHIE DES ACCIDENTS G�OLOGIQUES PAR IMAGERIE SATELLITAIRE LANDSAT-7 ETM+ ET ANALYSE DES cartographier les réseaux de fractures dans les roches cristallines et métamorphiques à l'aide des images les images brutes, permettant une meilleure cartographie des accidents géologiques. La carte

Paris-Sud XI, Université de

103

DTERMINATION QUANTITATIVE DES DENSITS LEVES DES DISLOCATIONS DANS DES MONOCRISTAUX DE GERMANIUM  

E-print Network

GERMANIUM PAR DIFFUSION D'ATOMES MARQU�S Par MAREK BRAFMAN, OLGA KRUSZEWSKA, WALDEMAR WRONSKI et KAROL'exemple des monocristaux de germanium et comparaison des résultats obtenus avec les mêmes déterminations measurement of the density of the autoradio- grams. The method is illustrated by example of germanium

Boyer, Edmond

104

A novel deep eutectic solvent-based ionic liquid used as electrolyte for dye-sensitized solar cells  

Microsoft Academic Search

We utilize a quaternary ammonium salt-derivative ionic liquid called G.CI which is a eutectic mixture of glycerol and choline iodide as electrolyte for dye-sensitized solar cells. Such eutectic compound belongs to a new series of ionic liquid called deep eutectic solvents (DES), which possess many outstanding features compared to the traditional imidazolium-based ionic liquids including cheap raw materials, simple preparation

Huei-Ru Jhong; David Shan-Hill Wong; Chi-Chao Wan; Yung-Yun Wang; Tzu-Chien Wei

2009-01-01

105

Sécurité au-delà des mythes et des croyances  

ScienceCinema

Présentation orale en français, support visuel en français et en anglais. La pire des failles de sécurité est l'impression de sécurité. Le décalage entre la compréhension que l?on a des technologies utilisées, et leurs potentiels réels, ainsi que l'impact potentiellement négatif qu'elles peuvent avoir sur nos vies, n'est pas toujours compris, ou pris en compte par la plupart d'entre-nous. On se contente de nos perceptions pour ne pas avoir à se confronter à la réalité... Alors qu'en est-il vraiment ? En matière de sécurité qui de l'humain ou des technologies a le contrôle ?

None

2011-10-06

106

A propos des divergences en théorie des champs quantifiés [83  

NASA Astrophysics Data System (ADS)

Comme nous le montrons ailleurs1), la causalité impose à la matrice S qui décrit l'évolution d'un système une structure bien déterminée : lorsqu'on développe celle-ci suivant les opérateurs de translation dans l'espace des quanta, les coefficients S^{(i)} left[ {tau ''; u''../tau '; u' \\cdot \\cdot } right] sont des intégrales multiples où n'apparaissent, à cOté des champs liés à un seul point de l'espace temps, que les functions*): D^c (x/y) = D^s (x/y) + _2^i D^1 (x/y) x ne y

107

Pacs des villes et pas des champs ? Emmanuel Jaurand  

E-print Network

). Après le pic de 2000, le total annuel de signatures de pacs entre personnes du même sexe a oscillé entre désormais être affinée en fonction du sexe des pacsés. La répartition des pacs entre personnes du même sexe'organiser juridiquement une vie de couple quel que soit le sexe des partenaires, le pacs a d'abord été une innovation

Paris-Sud XI, Université de

108

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

109

EXPRIENCES SUR LE ROLE DES GAZ DANS LE PHNOMNE DE L'BULLITION DES LIQUIDES;  

E-print Network

dégagent toutes à l'orifice de la petite cloche, sous laquelle de l'air est resté emprisonné. (1 exclusi- vement à l'orifice de la cloche, et elles se succèdent d'autant plus rapidement que cet orifice toutes à son orifice, entraînant chacune une petite quantité d'air, comme on peut s'en assurer

Paris-Sud XI, Université de

110

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

111

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.

112

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.

James H. Kessler

2007-01-01

113

Directable photorealistic liquids  

Microsoft Academic Search

We present a method for the directable animation of photorealistic liquids using the particle level set method to obtain smooth, visually pleasing complex liquid surfaces. We also provide for a degree of control common to particle-only based simulation techniques. A variety of directable liquid primitive variables, including the isosurface value, velocity, and viscosity, can be set throughout the liquid. Interaction

N. Rasmussen; D. Enright; D. Nguyen; S. Marino; N. Sumner; W. Geiger; S. Hoon; R. Fedkiw

2004-01-01

114

Die Rolle des Publikums fokussiert auf die Optionen der Mitgestaltung im öffentlich-rechtlichen Fernsehangebot des ORF in Österreich.  

E-print Network

??Untersuchungsgegenstand: Im Zentrum steht die Option und Ausführung des „Mitspracherechts“ des Publikums an fernsehpublizistischen Inhalten des öffentlich-rechtlichen Rundfunks ORF in Österreich, sowie das Angebot der… (more)

Scherzinger, Ronja-Svenja

2012-01-01

115

Exploring How Liquids Behave  

NSDL National Science Digital Library

Learners apply their knowledge from a previous study to identify different liquids--water, corn syrup, and vegetable oil. They also investigate combinations of liquids, two at a time, to see how they interact. This is meant as a follow-up lesson to the related activity, Exploring Liquids. As an extension, learners can continue their study of these liquids in the lesson, Traveling Through Different Liquids.

Janulaw, Sharon

2010-01-01

116

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

117

Plan de cours Facult des arts et des sciences  

E-print Network

types d'organisation des monères, protistes, mycètes, algues et plantes. #12;SYLLABUS G�N�RAL Date Cours et de systématique. 16 septembre 2 Origine et évolution des Eucaryotes. Straménopiles (Algues Brunes (lichens et mycorhizes) et Myxomycètes. 7 octobre 5 Algues de la Lignée Verte (Glaucophytes, Rhodophytes

Parrott, Lael

118

Plan de cours Facult des arts et des sciences  

E-print Network

des êtres vivants ; · structures et types d'organisation des monères, protistes, mycètes, algues et. Straménopiles (Algues Brunes, Diatomées et Oomycètes). 22 septembre 3 Protozoaires. 29 septembre 4 Mycètes, Associations fongiques (lichens et mycorhizes) et Myxomycètes. 6 octobre 5 Algues de la Lignée Verte

Parrott, Lael

119

UNIVERSIT DE NANTES FACULT DES SCIENCES ET DES TECHNIQUES  

E-print Network

'ophiolite d'Oman et au programme d'étude des nouvelles AOC des Muscadet de la région nantaise ______ TH�SE DE............................................................. 51 2.2 Contexte géologique de l'ophiolite d'Oman ..................................................................................................................................... 54 2.2.2 Formation de l'ophiolite et unités lithologiques affleurant dans les montagnes d'Oman

Paris-Sud XI, Université de

120

Musee des Horreurs  

NSDL National Science Digital Library

What is this Musee des Horreurs? Visitors will find out soon enough: it is a remarkable collection of 52 hand-colored lithograph caricatures of individuals involved in the Dreyfus Affair in France. These lithographs were originally produced from 1899 to 1900 by an artist who used the pseudonym V. Lenepveu and they document the anti-Semitic upsurge brought about by this well-known event. Those represented in the caricatures include prominent members of the Jewish community, Dreyfus supporters, and Republican statesmen placed on grotesque animal bodies. Visitors with an interest in the subject may wish to use the images in a class on graphic design, illustration, European history, or cultural affairs.

121

Die fermentative Spaltung des Acetylcholins  

Microsoft Academic Search

Zusammenfassung Es wird eine neue Methode zum Nachweis des Fermentes, das Acetylcholin in Cholin und Essigsäure hydrolysiert, die Cholinesterase, beschrieben. Das Verfahren ist nach derWarburgschen Methode aufgebaut.

R. Ammon

1934-01-01

122

Thorie des ensembles 1. Motivation  

E-print Network

, comme Georg Cantor (1845-1918), Giuseppe Peano (1858-1932), Bertrand Russell (1872-1970) et autres. Nous de la démonstration (2). Figure I.1. Georg Cantor, Giuseppe Peano et Bertrand Russell La plupart des chasser du paradis que Cantor nous a bâti» (1). Plus tard, en parlant au Congrès des Mathématiciens à

Dolecki, Szymon

123

Modlisation du revtement de matire liquide par trempage selon une approche thermomcanique  

E-print Network

... Ce procédé consiste à immerger un moule dans un liquide et à "figer" une couche de matière d pendant que le liquide "se fige" autour du moule. Ces phénomènes peuvent être des transitions de phase au augmentation brutale de la viscosité) ainsi qu'une évaporation pendant l'extraction du moule. Le second aspect

Paris-Sud XI, Université de

124

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

125

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

126

Semiconductor nanorod liquid crystals  

SciTech Connect

Rodlike molecules form liquid crystalline phases with orientational order and positional disorder. The great majority of materials in which liquid crystalline phases have been observed are comprised of organic molecules or polymers, even though there has been continuing and growing interest in inorganic liquid crystals. Recent advances in the control of the sizes and shapes of inorganic nanocrystals allow for the formation of a broad class of new inorganic liquid crystals. Here we show the formation of liquid crystalline phases of CdSe semiconductor nanorods. These new liquid crystalline phases may have great importance for both application and fundamental study.

Li, Liang-shi; Walda, Joost; Manna, Liberato; Alivisatos, A. Paul

2002-01-28

127

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

128

Etude par diffusion de Huang des auto-interstitiels dans un alliage ordonn Fe-40 at Al irradi aux lectrons  

E-print Network

651 Etude par diffusion de Huang des auto-interstitiels dans un alliage ordonné Fe-40 at Al irradié at liquid hydrogen temperature, and diffuse X-ray scattering (MoK03B11) near Bragg reflections has been with the different simple interstitial configurations proposed for b.c.c. crystals suggests that the most probable

Boyer, Edmond

129

Dynamics of liquid-liquid displacement.  

PubMed

Capillary driven liquid-liquid displacement in a system with two immiscible liquids of comparable viscosity was investigated by means of optical high speed video microscopy. For the first time, the impact of substrate wettability on contact line dynamics in liquid-liquid systems was studied. On all substrates, qualitatively different dynamics, in two distinct velocity regimes, were found. Hydrodynamic models apply to the fast stage of initial spreading, while nonhydrodynamic dissipation dominates contact line motion in a final stage at low speed, where the molecular kinetic theory (MKT) successfully captured the dynamics. The MKT model parameter values showed no systematic dependence on substrate wettability. This unexpected result is interpreted in terms of local contact line pinning. PMID:19496572

Fetzer, Renate; Ramiasa, Melanie; Ralston, John

2009-07-21

130

Rock drilling, cooling liquids  

NSF Publications Database

Title : Rock drilling, cooling liquids Type : Antarctic EAM NSF Org: OD / OPP Date : October 23 ... impacts that could accrue from the use of cooling liquids during rock drilling. Our discussion of ...

131

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

132

Liquid seeding atomizer  

NASA Technical Reports Server (NTRS)

An atomizer for a liquid having an air supply is described. Liquid supply tubes extend longitudinally along the air supply tube. The air supply tube has at least one air orifice extending from an inner surface of the tube through the tube. The liquid supply tubes are positioned on either side of the air orifices and the liquid tubes are sealed to the air supply tube. The liquid supply tubes with facing liquid orifices are positioned adjacent to each of the air orifices. The liquid supply tubes are laterally spaced apart at the liquid orifices at a distance less than the diameter of the air orifices to enable a beneficial venturi effect when the atomizer is in operation.

Seegmiller, Henry L. B. (inventor)

1987-01-01

133

Les limites de la couverture des risques en aquaculture : le cas des  

E-print Network

EA 4272 Les limites de la couverture des risques en aquaculture : le cas des conchyliculteurs en limites de la couverture des risques en aquaculture : le cas des conchyliculteurs en France Véronique Le in defining risks in aquaculture and we propose a classification that takes the specificities into account. We

Paris-Sud XI, Université de

134

Le got des ignames de Madagascar 1 valuation sensorielle de la perception des ignames de Madagascar,  

E-print Network

Le goût des ignames de Madagascar 1 �valuation sensorielle de la perception des ignames de Madagascar, dans le contexte des connaissances actuelles en psychophysiologie de la gustation par Claude endémiques de Madagascar, nous avons entrepris des tests d'évaluation sensorielle qui nous sont apparus comme

Paris-Sud XI, Université de

135

L'évolution des rythmes de travail entre 1995 et 2001 : quel impact des 35 heures ?  

Microsoft Academic Search

[fre] L’évolution des rythmes de travail entre 1995 et 2001: quel impact des 35 heures? . . Le «passage aux 35 heures» ne s’est pas limité à la baisse de la durée légale du travail. La négociation au sein des branches ou des entreprises a, en effet, porté simultanément sur la durée du travail, son organisation, les conditions de travail

Cédric Afsa; Pierre Biscourp

2004-01-01

136

Composition en acides amins des aliments et des rsidus de fermentation in vitro  

E-print Network

Composition en acides aminés des aliments et des résidus de fermentation in vitro M. ANTONGIOVANNI in vitro fermentation with rumen inoculum, and of the faeces relative to an in vivo digestibility trial run fermentation in vitro comme l'ont fait Dennison et Philips (1983) et des fèces. Pour des raisons de place, nous

Paris-Sud XI, Université de

137

On a phase field model for solid-liquid phase transitions  

E-print Network

during solidification) or for liquid-vapor mix- tures (e.g. boiling water), but also for elastic temperature differs from the equilib- rium temperature when the interface is moving or/and is curved des martyrs, F-38054 Grenoble cedex 9, didier.jamet@cea.fr 1 #12;tures (e.g. ice-water or alloys

Sart, Remi

138

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

139

Thermal conductivity of liquids  

Microsoft Academic Search

The Bridgman equation for thermal conductivity of liquids is examined and a relation between sonic velocity and latent heat of vaporization is given. A correlation based on the hole theory of liquids is presented. This correlation predicts thermal conductivity in the temperature range of -20° to +80°C for 16 liquids, and at 20°C for 50 liquids with an average absolute

D. S. Viswanath

1967-01-01

140

Liquid level sensing device  

DOEpatents

A liquid level sensing device comprising a load cell supporting a column or stack of segments freely resting on one another. The density of each element is substantially identical to that of the surrounding liquid. The elements are freely guided within a surrounding tube. As each element is exposed above the liquid level, its weight will be impressed through the column to the load cell, thereby providing a signal at the load cell directly proportional to the liquid level elevation.

Tokarz, Richard D. (West Richland, WA)

1983-01-01

141

Fluid Mechanics of Liquid-Liquid Systems.  

NASA Astrophysics Data System (ADS)

The detailed hydrodynamics of selected liquid -liquid flow systems are investigated to provide a firm foundation for the rational design of separation processes. The implementation of this objective centers on the development of a robust code to simulate liquid-liquid flows. We have applied this code to the realistic simulation of aspects of the complex fluid mechanical behavior, and developed quantitative insight into the underlying processes involved. The Volume of Fluid (VOF) method is combined with the Continuous Surface Force (CSF) algorithm to provide a numerically stable code capable of solving high Reynolds numbers free surface flows. One of the developments during the testing was an efficient method for solving the Young-Laplace equation describing the shape of the meniscus in a vertical cylinder for a constrained liquid volume. The steady-state region near the nozzle for the laminar flow of a Newtonian liquid jet injected vertically into another immiscible Newtonian liquid is investigated for various Reynolds numbers by solving the axisymmetric transient equations of motion and continuity. The analysis takes into account pressure, viscous, inertial, gravitational, and surface tension forces, and comparison with previous experimental measurements shows good agreement. Comparisons of the present numerical method with the numerical results of previous boundary-layer methods help establish their range of validity. A new approximate equation for the shape of the interface of the steady jet, based on an overall momentum balance, is also developed. The full transient from liquid-liquid jet startup to breakup into drops is also simulated numerically. In comparison with experiment, the results of the present numerical method show a greater sensitivity of the jet length to the Reynolds number than the best predictions of previous linear stability analyses. The formation of drops is investigated at low to high Reynolds numbers before and after jet formation. The numerical simulations are satisfactorily compared with n-heptane/water experiments and previous simplified analyses based on drop formation before and after jetting. Although the program and numerical techniques developed in this dissertation have been used mainly to solve problems involving liquid-liquid jets and drops, many features of more complex and general liquid-liquid contacting systems are explored in the process.

Richards, John Reed

142

CAMPAGNE DE RECRUTEMENT DES ENSEIGNANTS-CHERCHEURS -SESSION SYNCHRONISEE 2014 -LISTE des MEMBRES des CDS POSTES DE MAITRES DE CONFERENCE  

E-print Network

Mathématiques, bâtiment Fermat département de Mathématiques et applications Ecole Normale Supérieure InriaCAMPAGNE DE RECRUTEMENT DES ENSEIGNANTS-CHERCHEURS - SESSION SYNCHRONISEE 2014 - LISTE des MEMBRES des CDS POSTES DE MAITRES DE CONFERENCE Numéro Poste Nature Concours Section(s) CNU Profil Labo d

Arleo, Angelo

143

Mixtures of ionic liquids.  

PubMed

Simple ionic liquids have long been held to be designer solvents, based upon the ability to independently vary their cations and anions. The formation of mixtures of ionic liquids increases this synthetic flexibility. We review the available literature of these ionic liquid mixtures to identify how their properties change and the possibility for their application. PMID:22890419

Niedermeyer, Heiko; Hallett, Jason P; Villar-Garcia, Ignacio J; Hunt, Patricia A; Welton, Tom

2012-12-01

144

Tunable liquid crystal lasers  

Microsoft Academic Search

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

Scott J. Woltman

2008-01-01

145

Electronic Liquid Level Indicator  

Microsoft Academic Search

A method of continuously measuring the level of conducting and non-conducting liquids has been developed. The liquid to be measured occupies the inner space of a coaxial cylindrical condenser. As the level of liquid varies, the capacitance varies. The change in capacitance detunes a resonance resulting in a change of plate current through the oscillator tube.

S. C. Coroniti

1942-01-01

146

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

147

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

148

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

149

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

150

NANCY LANGSTON REGULATINGDIETHYLSTILBESTROL (DES), ENDOCRINE DISRUPTORS,  

E-print Network

NANCY LANGSTON REGULATINGDIETHYLSTILBESTROL (DES), ENDOCRINE DISRUPTORS, the retreat from precaution: Nancy Langston, "The Retreat from Precaution: Regulating Diethylstilbestrol (DES), Endocrine is played by endocrine disruptors--industrial pollutants that mimic hormones and alter sexual development

Langston, Nancy

151

SECRETARIAT GENERAL Direction des ressources humaines  

E-print Network

DE SUIVI DES TRAVAUX DU PLAN TRIENNAL DE DEVELOPPEMENT DE L'EMPLOI ET DE L'INSERTION DES PERSONNES de poste sur le site Web du CNRS. Cela permettrait aux professionnels de disposer d'un contact direct

Canet, Léonie

152

Vitrification and levitation of a liquid droplet on liquid nitrogen  

E-print Network

Vitrification and levitation of a liquid droplet on liquid nitrogen Young S. Songa , Douglas Adlera the liquid, when the liquid droplet comes into direct contact with liquid nitrogen. This is distinct from.e., vitrification) and the levitation of droplets on liquid nitrogen (i.e., Leidenfrost phenomenon) take place

Demirci, Utkan

153

Minimisation des inductances propres des condensateurs à film métallisé  

NASA Astrophysics Data System (ADS)

In this article, we examine the different factors responsible for the equivalent series inductance in metallized capacitors and we propose structures for capacitors that reduce this inductance. After recalling the structure of metallized capacitors we compare, by experimental measurements, the inductance due to the winding and that one added by the connections. The latter can become preponderant. In order to explain the experimental evolution of the winding impedance vs. frequency, we describe an analytical model which gives the current density in the winding and its impedance. This model enables us to determine the self resonant frequency for different types of capacitors. From where, we can infer the influence of the height of capacitors and their internal and external radius upon performances, It appears that to reduce the equivalent series inductance, it is better to use flat windings and annular windings. Dans cet article nous examinons les différents facteurs responsables de l'inductance équivalente série dans les condensateurs à film métallisé et proposons des géométries de condensateurs qui réduisent cette inductance. Après avoir rappelé la structure des condensateurs à film métallisé, nous comparons, par des mesures expérimentales, l'inductance due au bobinage et l'inductance ajoutée par les connexions. Cette dernière peut devenir prépondérante. Afin d'expliquer l'évolution de l'impédance du bobinage en fonction de la fréquence, nous décrivons un modèle analytique qui donne la densité du courant dans le bobinage et l'impédance de ce dernier. En outre, ce modèle permet de déterminer la fréquence de résonance série de divers types de condensateurs ce qui permet de déduire l'influence de la hauteur des condensateurs et de leurs rayons interne et externe sur les performances. Il apparaît ainsi que, pour diminuer l'inductance équivalente série, il vaut mieux employer des bobinages plats et des bobinages annulaires.

Joubert, Ch.; Rojat, G.; Béroual, A.

1995-07-01

154

Etude des modes Raman de dformation angulaire des CH2 dans le polythylne  

E-print Network

. Abenoza Laboratoire de Spectroscopie Raman I, Université des Sciences et Techniques du Languedoc, 34060597 Etude des modes Raman de déformation angulaire des CH2 dans le polyéthylène Luu Dang Vinh, M spectres Raman d'échantillons de polyéthylène semi-cristallins ayant des cristallinités et des taux d

Boyer, Edmond

155

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

156

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

157

Article original Hydratation des micelles de casine  

E-print Network

15 septembre 1999) Abstract -- Casein micelle solvation and fractal structure of milk aggregatesArticle original Hydratation des micelles de caséine et structure fractale des agrégats et des gels the fractal theory. A relationship is observed between the hydration of casein particles, the structure

Boyer, Edmond

158

LA VITESSE DE REMONTE DES SPERMATOZODES  

E-print Network

cas les spermatozoïdes atteignent le pavillon en moins de 20 minutes. STARKE (1949) approuve les spermatozoïdes par unité de longueur. En effet, en maintenant un fragment des trompes de Fallope (2 mm) par une

Boyer, Edmond

159

Bioinformatique BTVStockage des donnees Bioinformatique BTV  

E-print Network

Bioinformatique BTVStockage des donn´ees Bioinformatique BTV Stockage des donn´ees Jean #12;Bioinformatique BTVStockage des donn´ees Plan Plan 1 Introduction 2 Format de stockage texte 3´ees Format de stockage texte Stockage au format texte Stockage au format texte 8 / 64 #12;Bioinformatique

Richer, Jean-Michel

160

Duality of liquids  

PubMed Central

Liquids flow, and in this sense are close to gases. At the same time, interactions in liquids are strong as in solids. The combination of these two properties is believed to be the ultimate obstacle to constructing a general theory of liquids. Here, we adopt a new approach: instead of focusing on the problem of strong interactions, we zero in on the relative contributions of vibrational and diffusional motion. We show that liquid energy and specific heat are given, to a very good approximation, by their vibrational contributions as in solids over almost entire range of relaxation time in which liquids exist as such, and demonstrate that this result is consistent with liquid entropy exceeding solid entropy. Our analysis therefore reveals an interesting duality of liquids not hitherto known: they are close to solids from the thermodynamic perspective and to flowing gases. We discuss several implications of this result. PMID:23851971

Trachenko, K.; Brazhkin, V. V.

2013-01-01

161

Intensification of Liquid-Liquid Contacting Processes  

E-print Network

transfer was intensified by the application of electric fields. As an alternative biofuel, biodiesel is produced through transesterification of vegetable oils, fat and algae lipids and alcohol with the help of acid or base. Transesterification is a liquid...

Qiu, Zheyan

2010-09-01

162

Liquid Crystal Materials and Liquid Crystal Displays  

Microsoft Academic Search

Since the early 1970s, three major prerequisites have brought the success of the liquid crystal display (LCD) technology to its key role of today. Namely, the discovery of electro-optical field-effects on which the displays are based, the successful search for liquid crystals (LCs) with material properties that meet the complex requirements of electro-optical effects and render the effects applicable in

Martin Schadt

1997-01-01

163

association des naturalistes de la  

E-print Network

influencées par les invasions marines de l'Eocène moyen/supérieur. Les Argiles Plastiques de Provins chenal/argilessables dépôts marins dépôts continentaux Marnes à Pholadomia ludensis Le caractère majeur de ces dépôts est leur constituées de débris de plantes transportés ; (2) des matériaux plus fins liés aux bordures des chenaux et

Paris-Sud XI, Université de

164

Paternité des articles et intérêts concurrents : une analyse des recommandations aux auteurs des journaux traitant de pratique pharmaceutique  

PubMed Central

RÉSUMÉ Contexte : La présence d’auteurs honorifiques et fantômes ainsi que les intérêts concurrents représentent des difficultés bien documentées, liées à la publication d’articles scientifiques. Il existe des lignes directrices encadrant la rédaction et la publication de manuscrits scientifiques, notamment celles de l’International Committee of Medical Journal Editors (ICMJE). Objectifs : L’objectif principal de cette étude descriptive et transversale visait à recenser les instructions portant sur la paternité des articles et les intérêts concurrents provenant des recommandations aux auteurs des journaux traitant de pratique pharmaceutique. L’objectif secondaire visait à déterminer des mesures correctrices pour une paternité des articles plus transparente. Méthode : La recherche a débuté par l’identification des journaux traitant de pratique pharmaceutique. La consultation des instructions aux auteurs des journaux a permis ensuite de recenser les recommandations destinées à éviter les problèmes de paternité des articles et d’intérêts concurrents. Finalement, les membres de l’équipe de recherche se sont consultés afin de définir des mesures correctrices possibles à l’intention des chercheurs. Résultats : Des 232 journaux traitant de pharmacie, 33 ont été définis comme traitant de pratique pharmaceutique. Un total de 24 (73 %) journaux mentionnaient suivre la politique de l’ICMJE, 14 (42 %) demandaient aux auteurs de remplir un formulaire de déclaration d’intérêts concurrents au moment de la soumission de l’article, 17 (52 %) présentaient une définition de la qualité d’auteur et 5 (15 %) demandaient de détailler les contributions de chaque auteur. Une grille de 40 critères a été élaborée pour définir l’attribution du statut d’auteur. Conclusion : Moins de la moitié des journaux demandait aux auteurs de transmettre un formulaire de déclaration des intérêts concurrents au moment de la soumission d’un article et seulement la moitié des journaux avait donné une définition de la qualité d’auteur. La publication scientifique de travaux sur les pratiques pharmaceutiques n’est pas à l’abri des manques de transparence liés à la publication. L’utilisation d’une grille décrivant la contribution de chaque auteur et la publication en ligne des travaux peuvent contribuer à limiter ces risques. PMID:24970938

Courbon, Ève; Tanguay, Cynthia; Lebel, Denis; Bussières, Jean-François

2014-01-01

165

Facult des arts et des sciences Dpartement de psychologie  

E-print Network

Formulaire d'inscription D.Psy (Option neuropsychologie clinique) V.00 3-220-1-4 Identification de l - Neurosciences des systèmes 3 PSY7413 - �valuation neuropsy. enfant/adolescent. 3 PSY7414 - �valuation neuropsy. adulte/aîné 3 PSY7416 - Neuropsychologie méthodes d'intervention 3 PSY7425 - Syndromes

Parrott, Lael

166

Plan de cours Facult des arts et des sciences  

E-print Network

'organisation des Protistes libres et parasites (Algues, Protozoaires). On soulignera les relations évolutives entre. 1966. Les algues d'Eau douce 1: Les Algues vertes 1968. " " " " 2: Les algues jaunes et brunes 1970. " " " " 3: Les algues bleues et rouges De Puytorac, P. et al. 1987. Précis de protistologie. Boubée

Parrott, Lael

167

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

168

Les caracteristiques des immigrants, l'effondrement de la TI et leur effet sur les gains initiaux des immigrants  

Microsoft Academic Search

En fondant notre recherche sur des donnees administratives, nous nous demandons 1) si l'evolution des caracteristiques des immigrants, notamment l'augmentation de la proportion d'immigrants ayant un niveau de scolarite universitaire et de celle des immigrants dans la categorie des < travailleurs qualifies de l'immigration economique >, ont contribue favorablement a l'augmentation des gains initiaux des immigrants dans les annees 1990

Garnett Hou Feng Picot

2009-01-01

169

Liquid level detector  

DOEpatents

A liquid level detector for conductive liquids for vertical installation in a tank, the detector having a probe positioned within a sheath and insulated therefrom by a seal so that the tip of the probe extends proximate to but not below the lower end of the sheath, the lower end terminating in a rim that is provided with notches, said lower end being tapered, the taper and notches preventing debris collection and bubble formation, said lower end when contacting liquid as it rises will form an airtight cavity defined by the liquid, the interior sheath wall, and the seal, the compression of air in the cavity preventing liquid from further entry into the sheath and contact with the seal. As a result, the liquid cannot deposit a film to form an electrical bridge across the seal.

Tshishiku, Eugene M. (Augusta, GA)

2011-08-09

170

Liquid Sloshing Dynamics  

NASA Astrophysics Data System (ADS)

The problem of liquid sloshing in moving or stationary containers remains of great concern to aerospace, civil, and nuclear engineers; physicists; designers of road tankers and ship tankers; and mathematicians. Beginning with the fundamentals of liquid sloshing theory, this book takes the reader systematically from basic theory to advanced analytical and experimental results in a self-contained and coherent format. The book is divided into four sections. Part I deals with the theory of linear liquid sloshing dynamics; Part II addresses the nonlinear theory of liquid sloshing dynamics, Faraday waves, and sloshing impacts; Part III presents the problem of linear and nonlinear interaction of liquid sloshing dynamics with elastic containers and supported structures; and Part IV considers the fluid dynamics in spinning containers and microgravity sloshing. This book will be invaluable to researchers and graduate students in mechanical and aeronautical engineering, designers of liquid containers, and applied mathematicians.

Ibrahim, Raouf A.

2005-06-01

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

Dielectrically actuated liquid lens  

NASA Astrophysics Data System (ADS)

A packaged liquid lens driven by the dielectric force was demonstrated. The liquid lens consisted of a low dielectric constant droplet and a high dielectric constant sealing liquid. The two non-conductive liquids were sealed in a chamber under the condition of iso-density. Focal length of a liquid lens with an aperture of 3mm changed from 34mm to 12mm in the range of 0-200V. Hysteresis was observed in the liquid lens, with a maximum value measured of 12.5° at 120 volts in terms of droplet's contact angle. The focal spot size measured approximately 80?m. Rise and fall times were 650ms and 300ms, respectively. The lens consumed 1mW of power when applying a 200 volt, 1 kHz signal. The longitudinal and transverse spherical aberrations were estimated to be nearly invariant when the focal length exceeded 20mm.

Cheng, Chih-Cheng; Yeh, J. Andrew

2007-06-01

173

Latina Voices of Des Moines.  

ERIC Educational Resources Information Center

This dissertation examines the lives of Hispanic women living in Des Moines and includes their views of problems and opportunities involved in living in that city. Interviews were conducted with 24 Latino women over the age of 17 who had been in the area for over 2 years. Findings indicate that learning to speak English was the single most…

Taylor, P. Dawn

174

PERFORMANCE DES ORGANISATIONS TRANSVERSALES HOSPITALIERES  

E-print Network

organizations, the Mobile Geriatrics Teams (MGTs). The findings draw on action research involving the 14 MGTs, Intangible Capital, Mobile Geriatrics Teams. Au cours des années 2000, le législateur a affirmé sa volonté d

Boyer, Edmond

175

La planification préalable des soins pour les patients en pédiatrie  

PubMed Central

RÉSUMÉ Les progrès médicaux et technologiques ont permis d’ac-croître les taux de survie et d’améliorer la qualité de vie des nourrissons, des enfants et des adolescents ayant des maladies chroniques mettant la vie en danger. La planifi-cation préalable des soins inclut le processus relié aux discussions sur les traitements essentiels au maintien de la survie et la détermination des objectifs des soins de longue durée. Les dispensateurs de soins pédiatriques ont l’obligation éthique d’assimiler cet aspect des soins médicaux. Le présent document de principes vise à aider les dispensateurs de soins à discuter de la planification préalable des soins des patients pédiatriques dans diverses situations. La planification préalable des soins exige des communications efficaces afin de clarifier les objectifs des soins et de s’entendre sur les traitements pertinents ou non pour réaliser ces objectifs, y compris les mesures de réanimation et les mesures palliatives.

2008-01-01

176

Low Toxic Ionic Liquids, Liquid Catanionics, and Ionic Liquid Microemulsions  

Microsoft Academic Search

In the future the demand of sustainable and low toxic surfactants and solvents will constantly increase. In this article, we present some new approaches to meet these requirements. Whereas ionic liquids are often based on imidazolium ions, we will show that there are also much less toxic ones, especially with choline as cation. Choline salts, even if solid at room

Werner Kunz; Eva Maurer; Regina Klein; Didier Touraud; Doris Rengstl; Agnes Harrar; Susanne Dengler; Oliver Zech

2011-01-01

177

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

178

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

179

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

180

Liquid Sloshing Dynamics  

Microsoft Academic Search

The problem of liquid sloshing in moving or stationary containers remains of great concern to aerospace, civil, and nuclear engineers; physicists; designers of road tankers and ship tankers; and mathematicians. Beginning with the fundamentals of liquid sloshing theory, this book takes the reader systematically from basic theory to advanced analytical and experimental results in a self-contained and coherent format. The

Raouf A. Ibrahim

2005-01-01

181

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.

Field, Michael E. (Albuquerque, NM); Sullivan, William H. (Albuquerque, NM)

1985-01-01

182

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

183

Hedging bank liquidity risk  

Microsoft Academic Search

Liquidity risk in banking has been attributed to transactions deposits and their potential to spark runs or panics. We show instead that transactions deposits help banks hedge liquidity risk from unused loan commitments. Bank stock-return volatility increases with unused commitments, but the increase is smaller for banks with high levels of transactions deposits. This deposit-lending risk management synergy becomes more

Evan Gatev; Til Schuermann; Philip E. Strahan

2006-01-01

184

Synthesis of ionic liquids  

DOEpatents

Ionic compounds which are liquids at room temperature are formed by the method of mixing a neutral organic ligand with the salt of a metal cation and its conjugate anion. The liquids are hydrophobic, conductive and stable and have uses as solvents and in electrochemical devices.

Dai, Sheng (Knoxville, TN); Luo, Huimin (Knoxville, TN)

2011-11-01

185

Liquid heat capacity lasers  

DOEpatents

The heat capacity laser concept is extended to systems in which the heat capacity lasing media is a liquid. The laser active liquid is circulated from a reservoir (where the bulk of the media and hence waste heat resides) through a channel so configured for both optical pumping of the media for gain and for light amplification from the resulting gain.

Comaskey, Brian J. (Walnut Creek, CA); Scheibner, Karl F. (Tracy, CA); Ault, Earl R. (Livermore, CA)

2007-05-01

186

Synthesis of ionic liquids  

DOEpatents

Ionic compounds which are liquids at room temperature are formed by the method of mixing a neutral organic liqand with the salt of a metal cation and its conjugate anion. The liquids are hydrophobic, conductive and stable and have uses as solvents and in electrochemical devices.

Dai, Sheng [Knoxville, TN; Luo, Huimin [Knoxville, TN

2008-09-09

187

Liquid metal embrittlement  

Microsoft Academic Search

Liquid metal embrittlement is the reduction in the elongation to failure that can be produced when normally ductile solid metals are stressed while in contact with a liquid metal. This review describes its principal characteristics and the several models which have been advanced in attempts to explain the occurrence and different features of the process. Comparison between theory and experiment

M. G. Nicholas; C. F. Old

1979-01-01

188

Liquid-Seeding Atomizer  

NASA Technical Reports Server (NTRS)

Particles sprayed in drops of evaporating liquid. Placed near wind-tunnel inlet, atomizer sprays evaporating liquid containing solid particles into wind-tunnel airflow. Particles entrained in flow and scatter light, enabling flow to be observed optically. One end of atomizer slides on stationary pin to accommodate thermal expansion and contraction.

Seegmiller, Henry L. B.

1988-01-01

189

Column Liquid Chromatography.  

ERIC Educational Resources Information Center

Reviews literature covering developments of column liquid chromatography during 1982-83. Areas considered include: books and reviews; general theory; columns; instrumentation; detectors; automation and data handling; multidimensional chromatographic and column switching techniques; liquid-solid chromatography; normal bonded-phase, reversed-phase,…

Majors, Ronald E.; And Others

1984-01-01

190

Guidance Document Cryogenic Liquids  

E-print Network

have boiling points below -73°C (-100°F). The most common cryogenic liquids currently on campus conditions of temperature and pressure. But all have two very important properties in common. First, the liquids and their vapors are extremely cold. The risk of destructive freezing of tissues is always present

191

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...

192

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

193

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

194

Coordinating chiral ionic liquids.  

PubMed

A practical synthesis of novel coordinating chiral ionic liquids with an amino alcohol structural motif was developed starting from commercially available amino alcohols. These basic chiral ionic liquids could be successfully applied as catalysts in the asymmetric alkylation of aldehydes and gave high enantioselectivities of up to 91% ee. PMID:24163003

Vasiloiu, Maria; Leder, Sonja; Gaertner, Peter; Mereiter, Kurt; Bica, Katharina

2013-12-14

195

UNIVERSIT DE NANTES FACULT DES SCIENCES ET DES TECHNIQUES  

E-print Network

Année 2008 Etude d'une nouvelle famille d'aluminosilicates de baryum et strontium dopés à l'europium . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1.1 Positionnement des niveaux énergétiques de l'europium et transi- tions observées . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 4.2.1 Dopage à l'europium . . . . . . . . . . . . . . . . . . . . . . . . . 76 4.2.2 Substitution

Paris-Sud XI, Université de

196

Plan de cours Facult des arts et des sciences  

E-print Network

fonctions des molécules du vivant ; expliquer la relation ADN - ARN - protéine ; connaître l'historique de C. Acides nucléiques Acides désoxyribonucléiques [ADN] Acides ribonucléiques [ARN] Réplication de l'ADN D. Transcription et traduction : synthèse protéique Transcription de l'ADN en ARN Traduction

Parrott, Lael

197

Facult des arts et des sciences Dpartement de science politique  

E-print Network

, 1936) ou de � nous la liberté ! (René Clair, 1931) à partir des textes de Karl Marx étudiés en classe théorie sociale, Coll. « Actuel Marx Confrontation », 2007. 23 janvier ­ Karl Marx et Friedrich Engels ­ L'idéologie - - LECTURES Karl Marx, La Sainte Famille ou Critique de la critique critique, Contre Bruno Bauer et consorts

Parrott, Lael

198

Comparaison des intentions entrepreneuriales des étudiants : France –Pays arabes  

Microsoft Academic Search

A partir d'une grille de lecture dérivée du modèle psychosocial du comportement planifié d'Ajzen, nous étudions les déterminons des intentions entrepreneuriales affichées par les étudiants en France et dans trois pays arabes, Algérie, Liban et Tunisie. Nous observons que les niveaux mesurés de ces intentions sont très différents d'un pays à l'autre et nous essayons d'expliquer ces divergences à partir

J. P. Boissin; B. Branchet; R. Benredjem; J. Schaaper

2009-01-01

199

volution des perceptions gustatives volution des perceptions gustatives  

E-print Network

tannins se lient aux protéines et forment des complexes insolubles totalement indigestes. En outre, les enzymes digestives sont également neutralisées par les aliments trop riches en tannins. La faculté de pour les végétaux [5]. Alors que la fabrication de grosses molécules de polyphénols comme les tannins

Paris-Sud XI, Université de

200

Evaluation des connaissances des parents sur les bronchiolites aiguës  

PubMed Central

Les infections respiratoires (IR) constituent la deuxième cause de mortalité infantile au Maroc, dû en partie à l'absence d'information et de sensibilisation. Le but de ce travail était d’évaluer les connaissances des parents sur la bronchiolite aiguë, infection respiratoire très fréquente. Nous avons réalisé une enquête basée sur un questionnaire, auprès de parents de nourrissons consultants pour toux, avec ou sans gêne respiratoire. 180 parents ont été inclus dans l’étude. Les parents pensaient que l'infection respiratoire était secondaire au climat froid (96%); seuls 4% ont évoqué une origine infectieuse. Aucun des parents ne savait que le lavage des mains était un moyen de prévention de la transmission. Les parents ont majoritairement répondu que la kinésithérapie respiratoire ne servait à rien (65%), et qu'elle était nocive (24.5%). Ce manque de connaissances fondamentales en matière d'IR et de bronchiolite en particulier, devrait inciter à entreprendre un programme de sensibilisation PMID:25328606

Gueddari, Widad; Tazi, Abderrahmane; Ouardi, Amine; Nani, Samira; Zineddine, Abdelhadi

2014-01-01

201

Fragility Control Using the Liquid-Liquid Transition in Molecular Liquid  

Microsoft Academic Search

Liquids, whose viscosity obeys the Arrhenius law, are called ``strong,'' while ``fragile'' liquids have the super-Arrhenius behavior. Here we report the first continuous control of the fragility of liquid of the same material over a wide range of fragility, using a continuous liquid-liquid transition. Our study clearly demonstrates that the fragility is not a material specific quantity, but is controlled

Rei Kurita; Hajime Tanaka

2006-01-01

202

Partager : des technologies de pointe au service de la société  

ScienceCinema

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

2011-10-06

203

FACULTE DES SCIENCES UNIVERSITE DE GENEVE REGLEMENT D'ORGANISATION DE LA FACULTE DES SCIENCES  

E-print Network

FACULTE DES SCIENCES UNIVERSITE DE GENEVE REGLEMENT D'ORGANISATION DE LA FACULTE DES SCIENCES règlement d'organisation de la Faculté, en vue de son approbation par le rectorat ; d) peut proposer au décanat des modifications des règlements et plans d'études ainsi que du règlement d'organisation de la

Halazonetis, Thanos

204

FACULTE DES SCIENCES UNIVERSITE DE GENEVE REGLEMENT D'ORGANISATION DE LA FACULTE DES SCIENCES  

E-print Network

FACULTE DES SCIENCES UNIVERSITE DE GENEVE REGLEMENT D'ORGANISATION DE LA FACULTE DES SCIENCES Au règlement d'organisation de la Faculté, en vue de son approbation par le rectorat ; d) peut proposer au décanat des modifications des règlements et plans d'études ainsi que du règlement d'organisation de la

Rochaix, Jean-David

205

La transmission des textes mathmatiques : l'exemple des lments d'Euclide Bernard VITRAC  

E-print Network

1 La transmission des textes mathématiques : l'exemple des �léments d'Euclide Bernard VITRAC Les'erreurs d'inattention par lassitude, facilité de corrections parfois abusives3. I. Les �léments d'Euclide Le cas des �léments d'Euclide, en treize Livres est, à bien des égards, exemplaire : · le traité a connu

Boyer, Edmond

206

MTHODOLOGIE D'ANALYSE DES PHNOMNES EXTRMES : LE CAS DES CYCLONES TROPICAUX  

E-print Network

M�THODOLOGIE D'ANALYSE DES PH�NOM�NES EXTR�MES : LE CAS DES CYCLONES TROPICAUX Karl HOARAU et.hoarau@u-cergy.fr Résumé Avec le changement climatique, beaucoup de scientifiques impliqués dans l'étude des cyclones futures. Avant que les chercheurs ne tentent d'extrapoler l'activité des cyclones extrêmes dans un climat

Paris-Sud XI, Université de

207

Répartitions modales urbaines, externalités et instauration de péages. Le cas des externalités de congestion et des \\  

Microsoft Academic Search

[fre] Répartitions modales urbaines, externalités et instauration de péages. Le cas des externalités de congestion et des « externalités modales croisées ». . Cet article se propose d'analyser les répartitions des usagers entre l'automobile et les bus dans le cadre des déplacements urbains domicile-travail. Dans ce contexte, l'objectif de cet article est de mettre en lumière deux types d'externalités générées

François Mirabel

1999-01-01

208

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

209

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

210

Stir membrane liquid-liquid microextraction.  

PubMed

In this article, a novel liquid phase microextraction technique, called stir membrane liquid-liquid microextraction (SM-LLME), is presented. The new approach combines the advantages of liquid phase microextraction and stirring in the same unit allowing the isolation and preconcentration of the analytes in a simple and efficient way. In the construction of the unit, a polymeric membrane is employed to protect the small volume of the extractant phase. The extraction technique is characterized for the resolution of a model analytical problem: the determination of five selected chlorophenols in water. A two-phase extraction mode is used for the extraction of the analytes with an organic solvent in which an in situ derivatization reaction takes place. The analytes are finally analyzed by gas chromatography/mass spectrometry. All the variables involved in the extraction process have been clearly identified and optimized. The new extraction mode allows the determination of chlorophenols with limits of detection in the range from 14.8 ng/L (for 2,4,5-trichlorophenol) to 22.9 ng/L (for 3-chlorophenol) with a relative standard deviation lower than 8.7% (for 2,6-dichlorophenol). PMID:21236434

Alcudia-León, M C; Lucena, R; Cárdenas, S; Valcárcel, M

2011-02-18

211

Application of Ionic Liquids in Liquid Chromatography  

Microsoft Academic Search

Interest in ionic liquids (ILs) for their potential application in analytical chemistry continues to grow. Their usefulness can be due to favourable physicochemical properties, like the lack of vapour pressure, good thermal and chemical stability as well as very good dissolution properties regarding both organic and inorganic compounds. A specific feature of ILs is that these compounds provide strong proton

Micha? Piotr Marsza??; Roman Kaliszan

2007-01-01

212

Solid-Liquid Interfacial Premelting  

E-print Network

We report the observation of a premelting transition at chemically sharp solid-liquid interfaces using molecular-dynamics simulations. The transition is observed in the solid-Al—liquid-Pb system and involves the formation of a liquid interfacial...

Yang, Yang; Asta, Mark; Laird, Brian Bostian

2013-02-28

213

PARASITES ORDINAIRES DES PORCS EN FRANCE ISOLEMENT DES SOUCHES POUR INFESTATIONS EXPRIMENTALES  

E-print Network

PARASITES ORDINAIRES DES PORCS EN FRANCE DIAGNOSTIC ISOLEMENT DES SOUCHES POUR INFESTATIONS' - Amboise R�SUM� Un survol sur les parasites ordinaires des porcs en France est présenté en distinguant les'Oesophagos- tomum est présenté. SUMMARY ORDINARY PARASITES OF SWINE IN FRANCE ; DIAGNOSIS ; ISOLATION

Boyer, Edmond

214

Aide aux doctorants pour la participation des Aide aux doctorants pour la participation des colloques  

E-print Network

Aide aux doctorants pour la participation à des colloques Aide aux doctorants pour la participation à des colloques retour Formation doctorale Aide aux doctorants pour la participation à des colloques aide vient compléter les financements déjà prévus par les laboratoires et les �coles doctorales pour

Di Girolami, Cristina

215

Difficile convergence des archives ouvertes en SIC # Difficile convergence des archives ouvertes  

E-print Network

Difficile convergence des archives ouvertes en SIC # Difficile convergence des archives ouvertes en Paris R�SUM�. L'article rend compte d'un test de moissonnage pour quatre archives ouvertes sélectionnées'identification des archives ouvertes SIC sur le répertoire international OpenDOAR, est ensuite approfondie à partir

Paris-Sud XI, Université de

216

COLORIMTRIE DES LED : INCERTITUDES ET INFLUENCE DU COURANT LECTRIQUE 17 Colorimtrie des LED  

E-print Network

COLORIM�TRIE DES LED : INCERTITUDES ET INFLUENCE DU COURANT �LECTRIQUE 17 N. POUSSET Colorimétrie des LED : incertitudes et influence du courant électrique LEDs colorimetry: uncertainties proximale, et indices de rendu des couleurs) de sources d'éclairage à LED, du LNE-INM/Cnam, est décrit. Les

Paris-Sud XI, Université de

217

Evolution des types cellulaires du lait de brebis (race Churra) en fonction des dnombrements cellulaires totaux  

E-print Network

Evolution des types cellulaires du lait de brebis (race Churra) en fonction des dénombrements) en fonction des dénombrements cellulaires totaux est étudiée dans le lait de 91 brebis de race Churra traite du matin, obtenu sur 91 brebis de race Churra : 42 appartenant à une exploitation avec traite

Paris-Sud XI, Université de

218

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

E-print Network

Electronique organique: Emission de lumière bleue dans des OLEDs via des excimères ces nouvelles molécules comme couche active dans des diodes organiques électroluminescentes (OLEDs OLEDs. Ces travaux s'intègrent dans la thématique "Composés 3-2spiro pour l'électronique organique

Rennes, Université de

219

Comptes Rendus des JNC 17 -Poitiers 2011 Nouvelle mthode de fabrication des composites fibres naturelles  

E-print Network

Comptes Rendus des JNC 17 - Poitiers 2011 1 Nouvelle méthode de fabrication des composites à fibres method of manufacture of natural fibers composites: Contribution of a paper layer to minimize mécaniques des matériaux composites unidirectionnels à fibres naturelles de chanvre et de lin. L

Paris-Sud XI, Université de

220

DTERMINATION ULTRASONORE DES PROPRITS LASTIQUES ET ANLASTIQUES EN FONCTION DE LA FRACTION VOLUMIQUE DES AMAS  

E-print Network

that the formation of Guinier-Preston zones in alumi- nium-magnesium alloys is accompanied by an increase VOLUMIQUE DES AMAS DE GUINIER-PRESTON DANS DES ALLIAGES ALUMINIUM-MAGN�SIUM C. GAULT Laboratoire de Physique que la formation des amas de Guinier-Preston dans les alliages aluminium-magnésium s'accompagne d

Paris-Sud XI, Université de

221

LE PROBLME DES NOMBRES CONGRUENTS Pierre Colmez  

E-print Network

Fibonacci (1175­1240). Théorème 3 (Fermat (1601­1665)). --- 1 n'est pas un nombre congruent. #12; 2 PIERRE COLMEZ C'est une des nombreuses utilisations que Fermat a trouvées pour sa méthode 2 de « la des­ centeLE PROBL�ME DES NOMBRES CONGRUENTS par Pierre Colmez Résumé. --- Ce texte est une introduction à la

Colmez, Pierre

222

FAILLES DE SECURITE DES APPLICATIONS WEB  

E-print Network

FAILLES DE SECURITE DES APPLICATIONS WEB PRINCIPES, PARADES ET BONNES PRATIQUES DE DEVELOPPEMENT Référence : Failles de sécurité des applications Web Date de dernière mise à jour : 03/04/2012 Version du-BY-NC-ND Objet du document : Ce document explique les 10 principales failles de sécurité des applications Web

Paris-Sud XI, Université de

223

Über die ?-Strahlung des Protactiniums  

Microsoft Academic Search

Zusammenfassung 1. Das a-strahlende Element Protactinium emittiert, ähnlich wie Radium, Radioactinium, Actinium X, auch sekundäre ß-Strahlen. 2. Es werden Absorptionskurven dieser ß-Strahlen aufgenommen und mit analogen Absorptionskurven der ß-Strahlen des Radioaetiniums verglichen. Die zeitlichen Änderungen der Kurven geben einen weiteren Beweis dafür, daß die ß-Strahlung beim Protactinium nicht etwa von irgendwelchen Verunreinigungen herrührt. 3. Es wird die Intensität der ß-Strahlen

Otto Hahn; Aristid v. Grosse

1928-01-01

224

MOISISSURES TOXINOGNES DES FOURRAGES ENSILS  

E-print Network

'ici démontré la production de mycotoxines dans les ensilages ; cet auteur a mis en évidence la présence de i à éventuelle de patuline dans la ration consommée; en effet, cette mycotoxine peut être élaborée par'une recherche systéma- tique de cette mycotoxine dans des échantillons d'ensilages dont la contamination s

Boyer, Edmond

225

Erste Symptome des Organizational Burnout  

Microsoft Academic Search

\\u000a Die ersten Anzeichen des Organizational Burnout sind weder von der betroffenen Organisation oder Institution noch von einem\\u000a externen Analysten zu erkennen. So wenig, wie beispielsweise Diabetes. Diese Krankheit kann jahrzehntelang unbemerkt verlaufen.\\u000a Die ersten Symptome sind in der Regel schwach ausgeprägt. Nicht einmal die Hälfte der Bluthochdruckerkrankungen wird erkannt\\u000a – und von diesen wird nur die Hälfte behandelt, weil es

Gustav Greve

226

Diagnostik von Knorpelschäden des Kniegelenks  

Microsoft Academic Search

ZusammenfassungZielstellung  Anliegen der Arbeit war es, die Validität der präoperativen klinischen Untersuchung, der radiologischen Befunde und der MRT bei der Diagnostik chondraler Schäden des Kniegelenks im Vergleich zur Arthroskopie zu bestimmen.Methode  Bei 721 Patienten mit Kniebeschwerden die 3 Monate oder länger andauerten, erfolgte die standardisierte klinische Diagnostik (Grinding-Test), die radiologische Standarddiagnostik (Standaufnahmen und Patella-Axial-Aufnahme) sowie die MRT-Untersuchung (T1- und T2-Wichtung). Alle Patienten wurden nachfolgend

G. Spahn; R. Wittig; E. Kahl; H. M. Klinger; T. Mückley; G. O. Hofmann

2007-01-01

227

Geschichtspolitische Verwerfungen des Post-Kommunismus.  

E-print Network

??Die vorliegende Diplomarbeit aus dem Feld der kritischen Museum Studies beschäftigt sich mit kuratorischen Strategien der Darstellung des Kommunismus im Kontext zeithistorischer Ausstellungen seit 1989.… (more)

Ziaja, Luise Adriane

2013-01-01

228

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

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

Le point sur l'inegalite des gains et sur la remuneration des jeunes durant les annees 90  

Microsoft Academic Search

De nombreux auteurs ont fait etat de l'inegalite de plus en plus prononcee des gains d'emploi particulierement chez les hommes. Le present article enrichit notre connaissance des tendances de l'inegalite des gains en repondant a trois questions. Premierement, comment l'inegalite des gains des personnes occupees a-t-elle evolue dans les annees 90? Notre etude indique que, du milieu des annees 80

Garnett Picot

1998-01-01

231

Relation entre les caractéristiques des table-bancs et les mesures anthropométriques des écoliers 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, Stève Marjelin; Gouthon, Polycarpe; Falola, Jean-Marie; Fiogbe, Michel Armand; Nigan, Issiako Bio

2014-01-01

232

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

233

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. 3 figs.

Abbin, J.P.; Andraka, C.E.; Lukens, L.L.; Moreno, J.B.

1992-01-14

234

Exploring Materials: Liquid Crystals  

NSDL National Science Digital Library

In this activity, learners discover that the way a material behaves on the macroscale is affected by its structure on the nanoscale. Learners investigate the properties of a heat sensitive liquid crystal and make their own liquid crystal sensor to take home. This is a fun and engaging activity, especially since liquid crystals are used in many consumer products, including cell phone displays, laptop computer screens, strip thermometers, and even "mood" rings! SAFETY: learners must be supervised when doing this activity. They must wear safety glasses to protect their eyes. Before doing this activity, read through the Material Safety Data Sheets.

Network, Nanoscale I.; Sciencenter

2010-01-01

235

Etude cytophotomtrique de l'ADN et des nucloprotines des spermatozodes du blier : influence du sjour  

E-print Network

Etude cytophotométrique de l'ADN et des nucléoprotéines des spermatozoïdes du bélier : influence du'un complexe entre l'ADN et la protéine spécifique du spermatozoïde (BNSP) riche en cystéine et en arginine colorabi- lité de l'ADN par le Feulgen sans que la teneur en ADN des spermatozoïdes, mesurée en UV ne

Paris-Sud XI, Université de

236

Nouvelles mobilisations productives des territoires autour des ports et des aroports  

E-print Network

'équipe «Territoires de la mondialisation et villes portuaires». #12;Le mode de développement post-industriel se fonde géographique ou l'équipement performant ne suffisent pas aux villes portuaires pour gagner le choix des socio-politiques territorialisés. Les systèmes d'acteurs et d'espaces doivent ainsi évoluer pour mettre

Paris-Sud XI, Université de

237

114. WEST SIDE OF LIQUID OXYGEN CONTROL ROOM (205). LIQUID ...  

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

114. WEST SIDE OF LIQUID OXYGEN CONTROL ROOM (205). LIQUID NITROGEN (LN2) SUBCOOLER ON LEFT; SKID 8, LIQUID OXYGEN CONTROLLER FOR SWITCHING BETWEEN RAPID-LOAD AND TOPPING ON RIGHT. LIQUID OXYGEN LINE FROM SKID 9A AT RIGHT EDGE OF PHOTO. - Vandenberg Air Force Base, Space Launch Complex 3, Launch Pad 3 East, Napa & Alden Roads, Lompoc, Santa Barbara County, CA

238

Le diagnostic anténatal de la trisomie 21 par l'hybridation in situ en fluorescence (FISH): à propos des premiers tests réalisés au Maroc  

PubMed Central

Introduction Le but de cette étude était de présenter les premiers résultats de diagnostic anténatal de la trisomie 21 par la technique d'hybridation in situ en fluorescence (FISH) au Maroc et discuter son intérêt dans le diagnostic rapide de cette aneuploïdie. Méthodes Ce travail a été réalisé chez 23 femmes avec des grossesses à haut risque de trisomie 21. La moyenne d’âge des gestantes étaient de 37,43 ans avec des extrêmes de 21 et 43 ans. Toutes étaient musulmanes mariées, mariage légitimé par la Charia, dont trois mariages consanguins, sauf une originaire de la République Démocratique du Congo qui était chrétienne et concubine. La majorité des femmes étaient fonctionnaires et avaient un niveau de scolarisation moyen à élevé. Toutes les patientes ont bénéficié d'une consultation de génétique médicale au cours de laquelle il leur a été donné des informations sur la technique, son intérêt et ses limites. Il s'agit de femmes enceintes qui avaient soit un âge maternel élevé ou des signes d'appel échographiques et/ ou biochimiques. Une des patientes était porteuse d'une translocation robertsonienne t(14;21) équilibrée. Une amniocentèse a été réalisée chez toutes les gestantes et aucun avortement n'a était induit par ce geste invasif. L’âge gestationnel moyen à la première consultation était de 14 semaines d'aménorrhée (SA) et à l'amniocentèse était de 16 SA et 5 jours. L'analyse FISH a été réalisée, après consentement des couples, sur des cellules non cultivées à partir des échantillons de liquides amniotiques, en utilisant des sondes spécifiques du chromosome 21. Résultats Parmi les 23 patientes qui ont bénéficiées d'un diagnostic anténatal de la trisomie 21 par la technique FISH, nous avons pu rassurer 21 d'entre elles, et nous avons détecté deux cas de trisomie 21 fœtal. Conclusion La technique FISH permet un diagnostic anténatal rapide, en moins de 48h, de la trisomie 21 sur une faible quantité de liquide amniotique. Elle offre aux couples l'avantage de prendre, dans des délais raisonnables, la décision qui leur convient concernant la poursuite ou non de la grossesse. Elle permet souvent, avec un résultat normal, de rassurer rapidement les femmes enceintes trop angoissées. PMID:23330029

Lamzouri, Afaf; Natiq, Abdelhafid; Tajir, Mariam; Sendid, Mohamed; Sefiani, Abdelaziz

2012-01-01

239

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

240

Diet - full liquid  

MedlinePLUS

... liquid when they are at room temperature, like ice cream. It also includes strained creamy soups, tea, juice, ... Butter, margarine, oil, cream, custard, and pudding Plain ice cream, frozen yogurt, and sherbet. Fruit ices and popsicles ...

241

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

242

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.

Dr. Yuri Kazakevich

243

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

244

Liquid metal embrittlement mechanism  

Microsoft Academic Search

Liquid metal embrittlement was studied in the following two aspects. First the first principle and Chen-Nanxian three-dimensional\\u000a lattice reverse method were employed to obtain the effective potentials for Al-Ga and Ga-Ga. Then with the molecular dynamics\\u000a simulation, the influence of liquid metal adsorption on dislocation emission was studied. The simulated result shows that\\u000a after Ga atoms are adsorbed on the

Guohui Zhou; Xiaomin Liu; Farong Wan; Lijie Qiao; Wuyang Chu; Wenqing Zhang; Nanxian Chen; Fuxin Zhou

1999-01-01

245

A liquid microbarograph  

Microsoft Academic Search

A liquid microbarograph has been designed for continuous recording of variations in the atmospheric pressure with characteristic\\u000a times ranging from 0.25 s to a few hours with a resolution of 0.02 Pa or better. The instrument is based on a sensor composed\\u000a of two communicating vessels filled with transformer oil. A shift of the liquid level is recorded by the

O. I. Akhmetov; S. V. Pilgaev; Yu. V. Fedorenko; D. V. Dneprovskii

2010-01-01

246

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

247

Agénésie bilatérale des vésicules séminales et des canaux déférents  

PubMed Central

Résumé L’absence de canaux déférents et de vésicules séminales est une cause très rare d’infertilité masculine qui pose des difficultés d’ordre diagnostique. De plus, son traitement est complexe. Dans le présent article, nous rapportons le cas d’un patient âgé de 43 ans qui a consulté pour infertilité primaire évoluant depuis 5 ans (un conseil génétique a été réalisé) et nous examinons les difficultés diagnostiques et thérapeutiques liées à cette forme particulière d’infertilité. PMID:25132895

Kassogué, Amadou; El Ammari, J. Eddine; Diarra, Alkadri; Amiroune, Driss; Ahsaini, Mustapha; Ouldim, Karim; Traoré, Zacharia; Sqalli, H. Nadia; Tizniti, Siham; Mellas, Soufiane; Tazi, M. Fadl; Khallouk, Abdelhak; El Fassi, M. Jamal; Farih, My Hassan

2014-01-01

248

Thorie des Jeux Et ses Applications  

E-print Network

relance »...) Importance de la théorie des probabilités #12;Un Peu d'Histoire John von Neumann (1903-1957 si cBJohn von Neumann (1944 économique et politique Quelques contributions de J. Von Neumann : Axiomatisation des mathématiques

Giraud, Olivier

249

Titel des Moduls: Brain-Computer Interfacing  

E-print Network

Titel des Moduls: Brain-Computer Interfacing LP (nach ECTS): 9 Kurzbezeichnung: MINF Brain-Computer Interfacing. Sie sind in der Lage, eigenständig die Verfahren der biomedizinischen. In einigen Spezialthemen des Brain- Computer Interfacing haben die Teilnehmer eine vertiefte Kenntnis. Die

Wichmann, Felix

250

Liquidity Risk and Syndicate Structure  

Microsoft Academic Search

We offer a new explanation of loan syndicate structure based on banks' comparative advantage in managing systematic liquidity risk. When a syndicated loan to a rated borrower has systematic liquidity risk, the fraction of passive participant lenders that are banks is about 8% higher than for loans without liquidity risk. In contrast, liquidity risk does not explain the share of

Evan Gatev; Philip Strahan

2008-01-01

251

Determination of free desmosine and isodesmosine as urinary biomarkers of lung disorder using ultra performance liquid chromatography-ion mobility-mass spectrometry.  

PubMed

The elastin degradation products, desmosine (DES) and isodesmosine (IDES) are highly stable, cross-linking amino-acids that are unique to mature elastin. The excretion of DES/IDES in urine, in the free form and with associated peptide fragments, provides an indicator of lung damage in chronic obstructive pulmonary disease (COPD). A quantitative ion mobility-mass spectrometry (IM-MS) method has been developed for the analysis of free DES/IDES in urine with deuterated IDES as an internal standard. Resolution of DES/IDES isomers was achieved in less than five minutes using ultra performance liquid chromatography (UPLC) combined with ion pairing. The optimized UPLC-IM-MS method provided a linear dynamic range of 10-300 ng/mL and a limit of quantitation of 0.028 ng/mL for IDES and 0.03 ng/mL for DES (0.55 ng and 0.61 ng on column respectively). The method reproducibility (%RSD) was <4% for DES and IDES. The UPLC-IM-MS method was applied to the analysis of urine samples obtained from healthy volunteers and COPD patients. The DES/IDES concentrations in healthy and COPD urine showed an increase in DES (79%) and IDES (74%) in the COPD samples, relative to healthy controls. The incorporation of an IM separation prior to m/z measurement by MS was shown to reduce non-target ion responses from the bio-fluid matrix. PMID:22088351

Devenport, Neil A; Reynolds, James C; Parkash, Ved; Cook, Jason; Weston, Daniel J; Creaser, Colin S

2011-12-15

252

Liquid crystal photonics: optical switching and image storage using nematic liquid crystals and ferroelectric liquid crystals  

Microsoft Academic Search

Manipulation of light by light as a stimulus by the use of liquid-crystalline materials was explored, which was aimed at optical switching, optical image storage and optical display. Two types of the liquid-crystalline materials are used: nematic liquid crystals and ferroelectric liquid (FLCs). Several kinds of optical switching and image storage systems were demonstrated by means of photochromic molecules and

Atsushi Shishido; Osamu Tsutsumi; Akihiko Kanazawa; Takeshi Shiono; Tomiki Ikeda

1997-01-01

253

Erweiterung des Fermat Problems Matthias Monzel, Oksana Vogelsang, Patrick Hans  

E-print Network

Erweiterung des Fermat Problems Matthias Monzel, Oksana Vogelsang, Patrick Hans Sommersemester 2013 Matthias Monzel, Oksana Vogelsang, Patrick Hans Erweiterung des Fermat Problems #12;Inhaltsverzeichnis 1 Beweis zum Fermat-Punkt 2 Erweiterung des Problems auf vier Standorte 3 Erweiterung des Problems auf drei

Krumke, Sven O.

254

RECHERCHES EXPRIMENTALES SUR LA DURE DE PASSAGE DES SPERMATOZODES  

E-print Network

pertes d'ADN au cours des extractions : - variations dans la teneur en ADN en fonction du nombre des lavages avec la solution de KREI3S-lIENSELEIT-RINGER, - variations dans la teneur en ADN des autres : - contamination par le plasma séminal des phospholipides,- contamination de l'ADN. 2. Dosage du

Boyer, Edmond

255

VOLUTION DES FERRITES DOUX POUR TLCOMMUNICATIONS ET TLVISION  

E-print Network

the 15 last years : improvement of composition, magnetic circuits, technologies, a. s. o. Results années : améliorations des compositions des matériaux, des circuits magnétiques, des technologies de. 2014 In spite of the fact that the soft ferrites are old materials (their development has been made

Boyer, Edmond

256

Caractristiques spectrales de pigesjaunes utiliss pour la capture des aphides  

E-print Network

Caractéristiques spectrales de piègesjaunes utilisés pour la capture des aphides Charles BALDY Jean'atterrissage des aphides. La répartition spectrale et Transmittance, l'intensité des réflectances à des longueurs d Spectral characteristics of yellow water pans used for aphid trapping Visible spectrophotometry

Paris-Sud XI, Université de

257

enNouvelle-Caldonie La dgradation des habitats  

E-print Network

recouvrement des fonds marins de particules fines provenant du décapage des mines, provoquant la mort de étude a pu identifier 200 plantes exotiques envahissantes parmi lesquelles 100 présentent une menace ailleurs pour être invasives. Surpâturage, consommation des jeunes pousses d'arbres, des graines, arrêt de

258

Une etude sur la traduction des -termes dans le -calcul  

E-print Network

#25; et #21; Une #19;etude sur la traduction des #21;-termes dans le #25;-calcul Damiano Mazza #3;-calcul, un formalisme introduit #18;a la #12;n des ann#19;ees '80 pour la mod#19;elisation des syst#18;emes mobiles, et le #21;-calcul, l'un des mod#18;eles de calcul les plus connus et utilis#19;es en

Mazza, Damiano

259

Structure, stability and behaviour of nucleic acids in ionic liquids.  

PubMed

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

2014-08-01

260

Spendenzusage im Rahmen des Deutschlandstipendienprogramms I. Die Firma/Organisation/Privatperson  

E-print Network

1 Spendenzusage im Rahmen des Deutschlandstipendienprogramms I. Die Firma/Organisation (Kassenzeichen) und Bezeichnung des Stipendiengebers V. Kontaktdaten der Spenderin/des Spenders Firma/Organisation

Greifswald, Ernst-Moritz-Arndt-Universität

261

Etude du stockage de l'hydrogene sur des nanostructures de carbone microporeuses  

NASA Astrophysics Data System (ADS)

Le stockage de l'hydrogene par adsorption sur des adsorbants nano-structures a ete etudie sous differentes conditions de pression et de temperature. Les adsorbants etudies sont principalement des nanotubes de carbone a simple paroi ainsi que des structures metallo-organiques. Les mesures ont ete realisees a l'aide de systemes gravimetriques et volumetriques tres sensibles specialement mis au point pour de petits echantillons necessitant un degazage in situ. Les appareils developpes, au nombre de quatre, comprennent deux systemes gravimetriques et deux systemes volumetriques. Ensemble, ces systemes couvrent la plage de pressions (0-100) bars ainsi que la plage de temperatures (77-295) K. Les differentes analyses montrent que l'adsorption d'hydrogene sur les adsorbants nano-structures etudies est maximale a 77 K et varie entre environ (1.5 et 4) % masse. A temperature ambiante, l'adsorption croit lineairement avec la pression et demeure sous les 1% masse pour des pressions inferieures a 100 bars. L'adsorption d'hydrogene sur ces materiaux dans ces conditions se compare notamment a celle obtenue sur des charbons actives. La modelisation de l'adsorption a egalement ete realisee dans des conditions cryogeniques a l'aide du modele de Dubinin-Astakhov sous une forme adaptee pour l'adsorption supercritique. Les enthalpies d'adsorption calculees a partir de ce modele varient sous les 6 kJ/mole et sont donc consistantes avec des processus de physisorption. L'applicabilite du modele de Dubinin-Astakhov suggere que l'adsorption d'hydrogene puisse etre representee par un processus de remplissage des pores par un pseudo-liquide. Ces travaux s'inscrivent dans un contexte ou la capacite d'adsorption reelle des nanostructures de carbone est sujette a la controverse. En consequence, l'approche experimentale adoptee se distingue par les differentes demarches mises de l'avant pour l'obtention de mesures fiables sur des echantillons de faibles masses ainsi que par son caractere comparatif. Ces demarches incluent le developpement, l'etalonnage et la contreverification de systemes de mesures volumetriques et gravimetriques sensibles au microgramme. Ces systemes sont de plus adaptes au degazage sous vide et a haute temperature des echantillons. La mise au point d'un systeme de controle de temperature sur un petit volume pour des mesures a hautes pressions et basses temperatures constitue egalement un aspect original de ces travaux. De plus, d'un point de vue davantage theorique, cette these se caracterise par la modelisation de l'adsorption supercritique d'hydrogene sur differents materiaux et la derivation d'une expression pour l'enthalpie d'adsorption independante de la temperature a l'aide du modele de Dubinin-Astakhov.

Poirier, Eric

2007-12-01

262

Article de synthse Stockage des spermatozodes dans l'oviducte  

E-print Network

Article de synthèse Stockage des spermatozoïdes dans l'oviducte chez les oiseaux : approche la bibliographie consacrée aux aspects anatomique, his- tologique et fonctionnel du stockage des qui contrôle l'entrée et/ou le stockage des spermatozoïdes dans les glandes utéro-vaginales est de na

Paris-Sud XI, Université de

263

Redox chemistry at liquid/liquid interfaces  

NASA Technical Reports Server (NTRS)

The interface between two immiscible liquids with immobilized photosynthetic pigments can serve as the simplest model of a biological membrane convenient for the investigation of photoprocesses accompanied by spatial separation of charges. As it follows from thermodynamics, if the resolvation energies of substrates and products are very different, the interface between two immiscible liquids may act as a catalyst. Theoretical aspects of charge transfer reactions at oil/water interfaces are discussed. Conditions under which the free energy of activation of the interfacial reaction of electron transfer decreases are established. The activation energy of electron transfer depends on the charges of the reactants and dielectric permittivity of the non-aqueous phase. This can be useful when choosing a pair of immiscible solvents to decrease the activation energy of the reaction in question or to inhibit an undesired process. Experimental interfacial catalytic systems are discussed. Amphiphilic molecules such as chlorophyll or porphyrins were studied as catalysts of electron transfer reactions at the oil/water interface.

Volkov, A. G.; Deamer, D. W.

1997-01-01

264

Liquid lubrication in space  

NASA Technical Reports Server (NTRS)

The requirement for long-term, reliable operation of aerospace mechanisms has, with a few exceptions, pushed the state of the art in tribology. Space mission life requirements in the early 1960s were generally 6 months to a year. The proposed U.S. space station schedule to be launched in the 1990s must be continuously usable for 10 to 20 years. Liquid lubrication systems are generally used for mission life requirements longer than a year. Although most spacecraft or satellites have reached their required lifetimes without a lubrication-related failure, the application of liquid lubricants in the space environment presents unique challenges. The state of the art of liquid lubrication in space as well as the problems and their solutions are reviewed.

Zaretsky, Erwin V.

1990-01-01

265

OzDES: 100 Nights of AAT Spectroscopy on DES Sources  

NASA Astrophysics Data System (ADS)

OzDES is a 5 year, 100 night spectroscopic program on AAT using 2dF/AAOmega that commenced in September 2013. A collaboration between the Dark Energy Survey (DES) and members of the Australian astronomical community, OzDES will efficiently obtain spectra for a wide variety of DES science programs thanks to the near perfect overlap between the Dark Energy Camera and 2dF fields of view. The driver for the program is the DES Supernova Survey, as redshifts for supernova host galaxies down to 24 can be measured through repeated integrations over the duration of the survey. In addition to supernova host galaxies and many live supernovae, OzDES will perform a study of reverberation mapping of AGN, target strong lenses, and obtain redshifts for photo-z calibration.

D'Andrea, Christopher; OzDES

2014-01-01

266

Liquid xenon excimer laser  

SciTech Connect

The characteristics of the first excimer laser and the history of its creation are presented. The threshold lasing conditions and the modern theory of active media are considered, and the prospects for the development of excimer lasers operating on condensed inert gases are discussed. It is shown that in experiments on pumping liquid xenon, lasing was obtained simultaneously on excimers of several types, including excimers in liquid and gas phases. (special issue devoted to the 80th anniversary of academician n g basov's birth)

Molchanov, Alexander G [P.N. Lebedev Physics Institute, Russian Academy of Sciences, Moscow (Russian Federation)

2003-01-31

267

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

268

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

269

Liquid metal pump  

DOEpatents

The liquid metal pump comprises floating seal rings and attachment of the pump diffuser to the pump bowl for isolating structural deflections from the pump shaft bearings. The seal rings also eliminate precision machining on large assemblies by eliminating the need for a close tolerance fit between the mounting surfaces of the pump and the seals. The liquid metal pump also comprises a shaft support structure that is isolated from the pump housing for better preservation of alignment of shaft bearings. The shaft support structure also allows for complete removal of pump internals for inspection and repair.

Pennell, William E. (Greensburg, PA)

1982-01-01

270

Liquid sheet radiator  

NASA Technical Reports Server (NTRS)

A new external flow radiator concept, the liquid sheet radiator (LSR), is introduced. The LSR sheet flow is described and an expression for the length/width (l/w), ratio is presented. A linear dependence of l/w on velocity is predicted that agrees with experimental results. Specific power for the LSR is calculated and is found to be nearly the same as the specific power of a liquid droplet radiator, (LDR). Several sheet thicknesses and widths were experimentally investigated. In no case was the flow found to be unstable.

Chubb, Donald L.; White, K. Alan, III

1987-01-01

271

Liquid sheet radiator  

NASA Technical Reports Server (NTRS)

A new external flow radiator concept, the liquid sheet radiator (LSR), is introduced. The LSR sheet flow is described and an expression for the length/width (l/w) ratio is presented. A linear dependence of l/w on velocity is predicted that agrees with experimental results. Specific power for the LSR is calculated and is found to be nearly the same as the specific power of a liquid droplet radiator (LDR). Several sheet thicknesses and widths were experimentally investigated. In no case was the flow found to be unstable.

Chubb, Donald L.; White, K. Allan, III

1987-01-01

272

Breakup of Liquid Filaments  

E-print Network

and Basaran [11]. Theoretical models for the collapse of a thin filament of a Newtonian liquid (i.e. in which viscosity is independent of shear rate) of finite length, as shown in Fig. 1, have been proposed by Schulkes [10] and Notz and Basaran [11... and Notz and Basaran used combined Lagrangian-Eulerian methods (Galerkin finite element model, G/FEM) to solve the dynamics of in- compressible Newtonian liquid filaments surrounded by an inert ambient fluid, [10] and [11]. Due to computa- tional...

Castrejon-Pita, Alfonso A.; Castrejon-Pita, J.R.; Hutchings, I.M.

2012-01-01

273

Turbine meters for liquid measurement  

SciTech Connect

Liquid turbine meters operate in response to fundamental engineering principles, Operation with a single moving part produces excellent longevity and reliability. Liquid turbine meters display wide rangeability, high accuracy, excellent repeatability, low pressure drop and moderate cost. Liquid turbine meters may be applied to many different fluids with different physical properties and corrosive tendencies. The marriage of liquid turbine meters to electronic instruments allows instantaneous flow calculations and produces the flexibility to display data, store data, transmit data in the most convenient form. Liquid turbine meters should be the first flow measurement instrument considered for liquid measurement applications.

Wass, D.J.; Allen, C.R. [Daniel Flow Products Inc., Houston, TX (United States)

1995-12-01

274

Matrise et usage des TIC : la situation des enseignants en Belgique francophone  

E-print Network

1 Maîtrise et usage des TIC : la situation des enseignants en Belgique francophone Henry Julie discours européen concernant la maîtrise des TIC par les enseignants, les auteurs pointent du doigt les complémentaires et présentent la seule certification TIC existant à l'heure d'écrire ce texte : form@TICEF. La

Paris-Sud XI, Université de

275

SUR LA DISTRIBUTION DES INTERVALLES D'MISSION DES PARTICULES 03B1 DU POLONIUM  

E-print Network

SUR LA DISTRIBUTION DES INTERVALLES D'�MISSION DES PARTICULES 03B1 DU POLONIUM Par Mme CURIE. J'ai. publié, en 1911, quelques résultats relatifs à la numération des par- ticules a du polonium et à la loi'un long travail sur le polonium entrepris en collaboration avec M. Debierne. Ce travail avait pour but la

Paris-Sud XI, Université de

276

Contribution l'analyse des dterminants du comportement d'exercice des porteurs de stock options  

E-print Network

1 Contribution à l'analyse des déterminants du comportement d'exercice des porteurs de stock déterminants du comportement des salariés quant à l'exercice de leurs stock options, en mettant en lumière de'exercice de stock options dans 12 multinationales cotées aux Etats Unis. Nos résultats sont cohérents avec les

Paris-Sud XI, Université de

277

CONTRIBUTION A L'TUDE ANTIGNIQUE DES VIRUS INFLUENZA DES ANIMAUX  

E-print Network

CONTRIBUTION A L'�TUDE ANTIG�NIQUE DES VIRUS INFLUENZA DES ANIMAUX I. - NEURAMINIDASE DES VIRUS/Duck/Ukraine/63 (Hav7 Neq2) has the same neuraminidase as the equine virus A/equi !/Miami/63 (Heq2 Neq2) ; the A/Chicken Germany « N »/49 virus has the same neuraminidase as the equine virus A/equi i/Prague/!6. A comparative

Paris-Sud XI, Université de

278

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

279

Dveloppement des techniques de surveillance des mouvements de terrain : cas de la carrire souterraine de Grozon.  

E-print Network

, notamment lorsque ce dernier est situé dans des zones présentant des dangers importants vis-à-vis de la développer au sein des anciens vides et se propager vers la surface. Les principales causes de désordres produire en surface. Le problème le plus délicat se pose évidemment en terme de gestion du bâti existant

Paris-Sud XI, Université de

280

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

E-print Network

multifissuration des composites 1D Three consistent approaches of the multiple cracking process in 1D composites �.lantuejoul@mines-paristech.fr Résumé Il existe de nombreux modèles pour décrire la fissuration des composites 1D, avec, pour la plupart classer en trois approches : la première approche (CL) discrétise le composite, et tire aléatoirement des

Paris-Sud XI, Université de

281

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

282

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

283

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

284

Surface-tension-driven liquid liquid displacement in a capillary  

Microsoft Academic Search

This paper presents theoretical and experimental studies of the surface-tension-driven, two-immiscible liquid-liquid displacement in a horizontal capillary. Using the dynamic contact angle approach, a one-dimensional mathematical model is developed to describe the capillary displacement of a fixed liquid column by another liquid that continuously flows into the capillary by surface tension. Experiments for a water column displaced by silicon oil

W. K. Chan; C. Yang

2005-01-01

285

Models of liquid metal corrosion  

NASA Astrophysics Data System (ADS)

In the present study, models for liquid metal corrosion are reviewed and their applications in nuclear reactor engineering are discussed. The paper presents mathematical analysis of liquid metal corrosion, including species transport in solid steels, in flowing liquid metals, and mass exchange at liquid/solid interface. The survey illustrates the mechanisms of the liquid metal corrosion and sets up a system to calculate the corrosion rate and to study the corrosion species distributions in the solid and liquid metal/alloys. Both light liquid metal/alloy (sodium and sodium-potassium) and heavy liquid metal/alloy (liquid lead and lead-bismuth) are considered. Oxygen effects on liquid metal corrosion are also discussed. For liquid sodium and sodium-potassium the corrosion rate increases with increasing oxygen concentration, while for liquid lead and lead-bismuth it is reasonable to produce a protective oxide layer using an oxygen control technique which can mitigate the corrosion rate significantly. Finally, the corrosion-oxidation interaction in liquid lead and lead-bismuth are discussed.

Zhang, J.; Hosemann, P.; Maloy, S.

2010-09-01

286

Pulsating electrospray modes at the liquid-liquid interface  

NASA Astrophysics Data System (ADS)

Unforced liquid-liquid electrosprays have been demonstrated for water/heptane and ethylene glycol/heptane couples which exhibit stable high frequency current oscillations in the kilohertz range. Using in-line flow sensor measurements, the controlled ejection of subpicoliter volumes into an immiscible liquid phase was shown possible.

Alexander, Matthew S.

2008-04-01

287

Ferroelectric Liquid Crystals  

Microsoft Academic Search

The main advances in the field of bulk ferroelectric liquid crystals since 1984 are reviewed. Recent experiments have shown that the molecular tilt and the in-plane spontaneous polarization are not strictly proportional to each other as assumed before. Microscopic experiments such as NMR and NQR have further allowed for a determination of the basic order parameters as a function of

Robert Blinc; Cene Filipi?; Adrijan Levstik; BošTjan Žekš; T. Carlsson

1987-01-01

288

Cloud Liquid Water Measurements  

E-print Network

#12;Wet Power Term Energy is transferred to heat droplets to to the boiling point and vaporize of Vaporization · cw - Specific Heat of Water · Tv - Boiling Temperature of Water · Ta ­ Ambient Temperature #12 of Vaporization · cw - Specific Heat of Water · Tv ­ Water Boiling Temperature Solve for Liquid Water Content · P

Delene, David J.

289

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

290

ELECTRONS IN NONPOLAR LIQUIDS.  

SciTech Connect

Excess electrons can be introduced into liquids by absorption of high energy radiation, by photoionization, or by photoinjection from metal surfaces. The electron's chemical and physical properties can then be measured, but this requires that the electrons remain free. That is, the liquid must be sufficiently free of electron attaching impurities for these studies. The drift mobility as well as other transport properties of the electron are discussed here as well as electron reactions, free-ion yields and energy levels, Ionization processes typically produce electrons with excess kinetic energy. In liquids during thermalization, where this excess energy is lost to bath molecules, the electrons travel some distance from their geminate positive ions. In general the electrons at this point are still within the coulombic field of their geminate ions and a large fraction of the electrons recombine. However, some electrons escape recombination and the yield that escapes to become free electrons and ions is termed G{sub fi}. Reported values of G{sub fi} for molecular liquids range from 0.05 to 1.1 per 100 eV of energy absorbed. The reasons for this 20-fold range of yields are discussed here.

HOLROYD,R.A.

2002-10-22

291

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

292

LIQUID WASTE COMPOSTING  

EPA Science Inventory

This research project was conducted at the Chesapeake and Ohio Canal National Historical Park to examine the feasibility of adapting and using the sludge composting technique to compost liquid waste collected in the National Parks. This study evaluated the composting of two probl...

293

Liquid propellant densification  

NASA Technical Reports Server (NTRS)

Super cooling the cryogenic liquid propellant in a vehicle propellant tank densities the propellant allowing the vehicle propellant tank to carry more fuel in the same volume tank while lowering the vapor pressure and thus the tank operating pressure. Lowering the tank operating pressure reduces the stress and therefore allows the walls of the tank to be thinner. Both the smaller tank volume and thinner tank wall results in an overall smaller and lighter vehicle with increased payload capability. The cryogenic propellant can be supercooled well below the normal boiling point temperature level by transporting the liquid propellant from the vehicle tanks to a ground based cooling unit which utilizes a combination of heat exchanger and compressor. The compressor lowers the coolant fluid bath pressure resulting in a low temperature boiling liquid which is subsequently used to cool the recirculating liquid. The cooled propellant is then returned to the vehicle propellant tank. In addition to reducing the vehicle size and weight the invention also allows location of the vent valve on the ground, elimination of on-board recirculation pumps or bleed systems, smaller and lighter engine pumps and valves, lighter and more stable ullage gas, and significant reduction in tank fill operation. All of these mentioned attributes provide lower vehicle weight and cost.

Lak, Tibor I. (Inventor); Petrilla, Steve P. (Inventor); Lozano, Martin E. (Inventor)

1997-01-01

294

Liquid crystal polarization camera  

Microsoft Academic Search

Presents a fully automated system which unites CCD camera technology with liquid crystal technology to create a polarization camera capable of sensing the polarization of reflected light from objects at pixel resolution. As polarization affords a more general physical description of light than does intensity, it can therefore provide a richer set of descriptive physical constraints for the understanding of

L. B. Wolff; T. A. Mancini

1992-01-01

295

Liquid crystal polarization camera  

Microsoft Academic Search

We present a fully automated system which unites CCD camera technology with liquid crystal technology to create a polarization camera capable of sensing the partial linear polarization of reflected light from objects at pixel resolution. As polarization sensing not only measures intensity but also additional physical parameters of light, it can therefore provide a richer set of descriptive physical constraints

Lawrence B. Wolff; Todd A. Mancini; Philippe Pouliquen; Andreas G. Andreou

1997-01-01

296

Liquid nitrogen therapy.  

PubMed

Benign skin lesions such as solar and seborrhoeic keratoses, viral warts, and skin tags can be treated successfully by cutaneous cryotherapy. Complications are infrequent if the correct technique is used and local anaesthetic usually is unnecessary. Liquid nitrogen (boiling point -196 degrees C) is the usual freezing agent but carbon dioxide snow (-79 degrees C) is an adequate substitute. PMID:6477318

Segal, A

1984-05-01

297

Handbook of liquid metals  

NASA Technical Reports Server (NTRS)

Metals are described by physical appearance followed by atomic weight, atomic number, and valence. Data includes laboratory handling and safety procedures, heat transfer correlations, diffusion coefficients in liquid gallium/indium solution, melting and boiling points, thermal conductivity, heat capacity, and electrical resistivity.

Ukanwa, A. O.

1976-01-01

298

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

299

Instrumentation for Liquid Chromatography  

NASA Astrophysics Data System (ADS)

High performance liquid chromatography (HPLC) is one of the most rapidly growing and potentially largest branches of analytical chemistry. Although further advances in HPLC are to be expected, current methodology is already far enough advanced to insure its use in the clinical laboratory.

Henry, Richard A.; Sivorinovsky, Genrikh

300

Liquid laser cavities  

NASA Technical Reports Server (NTRS)

Liquid laser cavities have plenum chambers at the ends of the capillary cell which are terminated in transparent optical flats. By use of these cavities, several new europium chelates and a terbium chelate can provide laser action in solution at room temperature.

Bjorklund, S.; Filipescu, N.; Kellermeyer, G. L.; Mc Avoy, N.

1969-01-01

301

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

302

Liquid rocket valve assemblies  

NASA Technical Reports Server (NTRS)

The design and operating characteristics of valve assemblies used in liquid propellant rocket engines are discussed. The subjects considered are as follows: (1) valve selection parameters, (2) major design aspects, (3) design integration of valve subassemblies, and (4) assembly of components and functional tests. Information is provided on engine, stage, and spacecraft checkout procedures.

1973-01-01

303

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

304

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

305

Shocks in Cryogenic Liquids  

Microsoft Academic Search

A unified definition of cryogenic fluids has not been clearly given so far. Nevertheless, for convenience’s sake in this chapter, it may be defined as fluids of which normal boiling points (NBP) are below liquid nitrogen temperature, 77 K. The saturated vapor pressure and the triple points and the critical points are shown for typical cryogenic fluids in Fig. 4.1.

Masahide Murakami

306

Predicting Polymer/Liquide Interactions  

NASA Technical Reports Server (NTRS)

Calculations of liquid absorption by rubber vulcanizates agree with experimental results. Equation allows calculation of swelling of rubber vulcanizates by liquids, based on knowledge of chemical structure of polymer and solvent. Calculated values agree favorably with experimental data.

Fedors, R. F.

1985-01-01

307

Chemical propulsion using ionic liquids.  

PubMed

Chemical propulsion generates motion by directly converting locally stored chemical energy into mechanical energy. Here, we describe chemically driven autonomous motion generated by using imidazolium-based ionic liquids on a water surface. From measurements of the driving force of a locomotor loaded with an ionic liquid and observations of convection on the water surface originating from the ionic liquid container of the locomotor, the driving mechanism of the motion is found to be due to the Marangoni effect that arises from the anisotropic distribution of ionic liquids on the water surface. The maximum driving force and the force-generation duration are determined by the surface activity of the ionic liquid and the solubility of the ionic liquid in water, respectively. Because of the special properties of ionic liquids, a chemical locomotor driven by ionic liquids is promising for realizing autonomous micromachines and nanomachines that are safe and environmentally friendly. PMID:23398242

Tsuchitani, Shigeki; Takagi, Nobuhiro; Kikuchi, Kunitomo; Miki, Hirobumi

2013-03-01

308

Réactions Organiques des Alcools en Conditions Hydrothermales.  

E-print Network

??Cette thèse a pour objectif d'étudier les réactions des alcools en conditions hydrothermales. Dans une phase préliminaire, le phényl-éthanediol a été étudiés. Après aldolisation, cyclisation… (more)

Smutek, Bernhard

2011-01-01

309

TRANSMUTATION DES PARTICULES FONDAMENTALES. CHANGEMENT DE SPIN  

E-print Network

123. TRANSMUTATION DES PARTICULES FONDAMENTALES. CHANGEMENT DE SPIN Par A. PROCA. Institut Henri'entre elles, comme autant d'états distincts d'un seul et même corpus- cule et de regarder les transmutations

Boyer, Edmond

310

Supervision Dcentralise des Chorgraphies de Services  

E-print Network

, la croissance continuelle des entreprises incite celles-ci à externali- ser et à sous traiter-organisationnelle peut être mise en oeuvre afin de permettre la coordination et la synchronisation de ces différentes

Paris-Sud XI, Université de

311

Index des mots-cls Keywords index  

E-print Network

Index des mots-clés Keywords index A Abies, 823 Abies alba, 265 acacia, 93 Acacia cyanophylla Lindl., 335 Acacia mearnsii De Wild., 833 acclimation, 19 AFLP, 627 AFLP, SSR, EST markers, 637 Agrobacterium

Boyer, Edmond

312

Universit de Franche-Comt Programme des  

E-print Network

: Institut d'administration des entreprises SCD : Service commun de documentation de l'Université CLA problèmes liés à la santé : stress, addiction, interaction avec le monde hospitalier, la technologie au

Jeanjean, Louis

313

Habilitation Diriger Des Recherches Prsente devant  

E-print Network

des super héros qui ont et oeuvrent toujours pour le vivant et la Santé, au travers de la SFGBM mais compris, le fruit dun travail collectif et de collaborations multiples impliquant bien sur dautres

Paris-Sud XI, Université de

314

SUR QUELQUES POLLINISATEURS DES LGUMINEUSES FOURRAGRES  

E-print Network

blanc (Trifolium repens L.). LINSLEY (1946) donne le premier inventaire des pollinisateurs de la Luzerne plan économique :la Luzerne (Medicago sativa L.), le Trèfle violet (Trifolium pratense L.) et le Trèfle

Boyer, Edmond

315

HACK Patrice Les coulisses des assistances tlphoniques  

E-print Network

HACK Patrice 1 ________________________________________________________________ Les coulisses des Criminologie et de Police Technique et Scientifique LXV (2012) 110" #12;HACK Patrice 2 1 ­ Données et méthode

Paris-Sud XI, Université de

316

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

317

Liquid metal thermoacoustic engine  

SciTech Connect

We are studying a liquid metal thermoacoustic engine both theoretically and experimentally. This type of engine promises to produce large quantities of electrical energy from heat at modest efficiency with no moving parts. A sound wave is usually thought of as consisting of pressure oscillations, but always attendant to the pressure oscillation are temperature oscillations. The combination produces a rich variety of ''thermoacoustic'' effects. These effects are usually so small that they are never noticed in everyday life; nevertheless under the right circumstances they can be harnessed to produce powerful heat engines, heat pumps, and refrigerators. In our liquid metal thermoacoustic engine, heat flow from a high temperature source to a low temperature sink generates a high-amplitude standing acoustic wave in liquid sodium. This acoustic power is converted to electric power by a simple magnetohydrodynamic effect at the acoustic oscillation frequency. We have developed a detailed thermoacoustic theory applicable to this engine, and find that a reasonably designed liquid sodium engine operating between 700/sup 0/C and 100/sup 0/C should generate about 60 W/cm/sup 2/ of acoustic power at about 1/3 of Carnot's efficiency. Construction of a 3000 W-thermal laboratory model engine has just been completed, and we have exciting preliminary experimental results as of the time of preparation of this manuscript showing, basically, that the engine works. We have also designed and built a 1 kHz liquid sodium magnetohydrodynamic generator and have extensive measurements on it. It is now very well characterized both experimentally and theoretically. The first generator of its kind, it already converts acoustic power to electric power with 40% efficiency. 16 refs., 5 figs.

Swift, G.W.; Migliori, A.; Wheatley, J.C.

1986-01-01

318

Liquid crystalline dendrimers.  

PubMed

In recent years, there has been an increasing interest in the field of liquid crystalline dendrimers. Such a fast development is, among other things, driven by the multiple possibilities offered by combining the mesomorphic properties of single mesogenic subunits with the supermolecular and versatile architectures of dendrimers to yield a new class of highly functional materials. The induction and the control of the mesomorphic properties (phase type and stability) in dendrimers can be achieved by a dedicated molecular design which depends on the chemical nature and structure of both the functional groups and the dendritic matrix. In particular, the intrinsic connectivity of the dendrimer such as the multivalency of the focal core and the multiplicity of the branches, both controlling the geometrical rate of growth, or the dendritic generation, plays a crucial role and influences at various stages the subtle relationships between the supermolecular structure and the mesophase structure and stability. In this critical review article, an account of the various types of dendritic systems that form liquid-crystalline mesophases along with a description of the self-organization of representative case-study supermolecules into liquid crystalline mesophases will be discussed. Some basics of thermotropic liquid crystals and dendrimers will be given in the introduction. Then, in the following sections, selected examples including side-chain, main-chain, fullerodendrimers, shape-persistent dendrimers, supramolecular dendromesogens and metallodendrimers, as representative families of LC dendrimers, will be described. In the conclusion some further developments will be highlighted. This review will not cover liquid crystalline hyperbranched and dendronized polymers that might be considered as being somehow less structurally "perfect". PMID:17660881

Donnio, Bertrand; Buathong, Saïwan; Bury, Izabela; Guillon, Daniel

2007-09-01

319

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

320

75 FR 25319 - Agency Information Collection (Survey of Satisfaction With the Disability Evaluation System (DES...  

Federal Register 2010, 2011, 2012, 2013, 2014

...New (DES)] Agency Information Collection (Survey of Satisfaction With the Disability Evaluation System (DES)) Activities...DES).'' SUPPLEMENTARY INFORMATION: Title: Survey of Satisfaction with the Disability Evaluation System (DES). OMB...

2010-05-07

321

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

322

Ferroelectric and Antiferroelectric Liquid Crystals  

Microsoft Academic Search

Ferroelectric liquid crystals have been a major research topic since 30 years. However, when it comes to liquid crystals, the term “ferroelectric” is strongly ambiguous and frequently not only leads to confusion and misunderstanding but also obscures the basic concepts.The property of ferroelectricity in liquid crystals was first claimed in 1975. Five years later so-called surface-stabilized ferroelectric liquid crystals were

SVEN T. LAGERWALL

2004-01-01

323

Liquid crystalline composites containing phyllosilicates  

DOEpatents

The present invention provides barrier films having reduced gas permeability for use in packaging and coating applications. The barrier films comprise an anisotropic liquid crystalline composite layer formed from phyllosilicate-polymer compositions. Phyllosilicate-polymer liquid crystalline compositions of the present invention can contain a high percentage of phyllosilicate while remaining transparent. Because of the ordering of the particles in the liquid crystalline composite, barrier films comprising liquid crystalline composites are particularly useful as barriers to gas transport.

Chaiko; David J. (Naperville, IL)

2007-05-08

324

Quelques tendances actuelles en histoire des mathematiques.  

E-print Network

Development, sous la dir. de Joseph W. Dauben et Christoph J. Scriba, Birkh¨auser, B^ale, 2002, p. 6. 3 Voir Catherine Goldstein, Jeremy Gray et Jim Ritter, dir., L'Europe math´ematique : histoire, mythes, identit´ematiques `a des ´epoques et dans des cultures diff´erentes. Dans un ouvrage r´ecent dirig´e par Joseph Dauben

Aubin, David

325

L'occupation des espaces littoraux mditerranens  

E-print Network

I 1 i I L'occupation des espaces littoraux méditerranéens Olivier GODARD Bienqu'onpuisse dire d'accroissement considérablede lapression sur l'espace littoral :à l'île de Ré, le mètre carré, qui était à 2 F en 1953 est passé natu- rellement autour des principaux centres portuaires du littoral, déterminés par les profondeurs d

Paris-Sud XI, Université de

326

Die Erheblichkeit Des Humanismus In Durftiger Zeit  

E-print Network

Objekts wie ihn auch Auguste Comte verstanden hat. Die Kritik ist aber nicht stichhaltig gegenüber dem Positivismus des sinnhaften Erlebnisses, den Edmund Husserl in seinem Entwurf der Phänomenologie hervorbringt. Daher sind wir zu dem Schluß gekommen... ganz deutlich in Masaryks Humanismus geäussert, aber nicht nur dort. Der Gründer des modernen Positivismus, Auguste Com te, war auch derjenige Philosoph, der einen "Kult der Humanität" vorgeschlagen hat. Der britische Empirizist John Locke hat die...

Kohak, Erazim

327

LE PROBLME DES NOMBRES CONGRUENTS Pierre Colmez  

E-print Network

'est pas un nombre congruent. #12;2 PIERRE COLMEZ C'est une des nombreuses utilisations que Fermat implique donc le théorème de Fermat3 pour l'exposant 4. Exemple 4 (Zagier). -- L'entier 157 est congruentLE PROBL�ME DES NOMBRES CONGRUENTS par Pierre Colmez Résumé. -- Ce texte est une introduction à la

Colmez, Pierre

328

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

329

Liquid/Gas Flow Mixers  

NASA Technical Reports Server (NTRS)

Improved devices mix gases and liquids into bubbly or foamy flows. Generates flowing, homogeneous foams or homogeneous dispersions of small, noncoalescing bubbles entrained in flowing liquids. Mixers useful in liquid-metal magnetohydrodynamic electric-power generator, froth flotation in mining industry, wastewater treatment, aerobic digestion, and stripping hydrocarbon contaminants from ground water.

Fabris, Gracio

1994-01-01

330

Ionic Liquids in Chemical Analysis  

Microsoft Academic Search

Room-temperature ionic liquids are salts with a melting point close to or below room temperature. They form liquids composed in the majority of ions. This gives these materials the potential to behave very differently when they are used as solvents compared to conventional molecular liquids. The search for their application is growing in every area of analytical chemistry—electrochemistry, chromatography, electrophoresis,

Mihkel Koel

2005-01-01

331

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

332

Liquidity risk and syndicate structure  

Microsoft Academic Search

We decompose syndicated loan risk into credit, market, and liquidity risk and test how these shape syndicate structure. Commercial banks dominate relative to non-banks in loan syndicates that expose lenders to liquidity risk. This dominance is most pronounced when borrowers have high levels of credit or market risk. We then tie commercial banks’ advantage in liquidity risk to access to

Evan Gatev; Philip E. Strahan

2009-01-01

333

Liquid lubrication for space applications  

NASA Technical Reports Server (NTRS)

Reviewed here is the state of the art of liquid lubrication for space applications. The areas discussed are types of liquid lubrication mechanisms, space environmental effects on lubrication, classification of lubricants, liquid lubricant additives, grease lubrication, mechanism materials, bearing anomalies and failures, lubricant supply techniques, and application types and lubricant needs for those applications.

Fusaro, Robert L.; Khonsari, Michael M.

1992-01-01

334

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 “dissolving” 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.

James H. Kessler

2007-01-01

335

Asset Pricing with Liquidity Risk  

Microsoft Academic Search

This paper studies equilibrium asset pricing with liquidity risk | the risk arising from unpredictable changes in liquidity over time. It is shown that a security s required return depends on its expected illiquidity and on the covariances of its own return and illiquidity with market return and market illiquidity. This gives rise to a liquidity- adjusted capital asset pricing

Viral V. Acharya; Lasse Heje Pedersenz

2003-01-01

336

Transversely excited liquid crystal cells  

Microsoft Academic Search

The integration of photorefractive liquid crystal beam coupling devices into optical systems is often hampered by the need to tilt the liquid crystal cells to high angles of incidence in order to obtain efficient beam coupling. Owing to poor charge diffusion in most liquid crystal systems, charge migration depends mainly on an externally applied drift field. Conventional cells, with electrodes

Gary Cook; Jason P. Duignan; Lesley L. Taylor

2002-01-01

337

Acoustooptical Phenomena in Liquid Crystals  

Microsoft Academic Search

The review considers various aspects of the influence of mechanical deformation on the macroscopic structure and optical properties of liquid crystals: type of deformation (compression shear): deformation amplitude; relation between the acoustic wavelength, viscous wavelength, and liquid crystal layer thickness; mutual orientation of the wave vector and director; boundary conditions in the liquid-crystal cell (acoustically soft or acoustically rigid boundary);

O. A. Kapustina

1984-01-01

338

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

339

NMR in a liquid crystal solvent: study of the chirality of borocryptates  

NASA Astrophysics Data System (ADS)

Borocryptates of caesium and ammonium ions dissolved in a nematic liquid crystal were studied by NMR of quadrupolar nuclei 11B, 10B and 133Cs or 14N. Borocryptates are chiral molecules. We studied the racemic mixtures of enantiomers obtained by synthesis. In the particular solvent we used, the signal of a quadrupolar nucleus appears as a multiplet which quadrupolar splitting depends on which enantiomer the observed site belongs to. Because a different NMR signature is obtained for each enantiomer in these conditions, the chirality of the compounds can be investigated on several molecular sites: here the borate site of the ligand and the site of the complexed cations. The peristatic chirality of the receptor cavity has been evidenced by observing the entrapped cation. Des borocryptates de césium et d'ammonium dissous dans un cristal liquide nématique ont été étudiés par RMN, en observant les noyaux quadrupolaires 11B, 10B et 133Cs ou 14N. Les borocryptates sont des molécules chirales et les solutions préparées contenaient le mélange racémique obtenu par synthèse. Dans le solvant choisi, le signal d'un noyau quadrupolaire apparaît sous forme d'un multiplet dont l'éclatement quadrupolaire diffère suivant que le site observé appartient à l'un ou l'autre des énantiomères. On provoque ainsi une signature RMN distincte pour chaque émantiomère, ce qui permet de sonder la chiralité des composés sur plusieurs sites moléculaires : ici le site borate du ligand et le site des cations complexés. La chiralité péristatique de la cavité du cryptand a pu être mise en évidence par l'observation RMN du cation piégé.

Huguenard, C.; Taulelle, F.; Graf, E.; Hosseini, M. W.

1998-02-01

340

Diffusion des Metaux et Evolution Stellaire  

NASA Astrophysics Data System (ADS)

Nous presentons dans cette these des modeles d'evolution stellaire incorporant la diffusion microscopique de maniere consistante. Pour la premiere fois, on a calcule l'evolution d'etoiles en tenant compte en detail de l'impact des variations d'abondances sur leur structure. Nous utilisons des spectres monochromatiques pour chacun des elements les plus abondants dans un melange solaire pour recalculer l'opacite pour les abondances et les conditions locales dans l'interieur d'une etoile au cours de son evolution. Nos modeles montrent que la diffusion atomique des metaux a un effet important sur les opacites dan les etoiles de plus de 1.3Msolar ou l'abondance du fer et des autres elements du pic du fer varient substantiellement. Ces etoiles, sans rotation ou champ magnetique, sont proches des etoiles de type Fm-Am dans lesquelles on observe une legere surabondance d'elements du pic du fer en plus d'une sous-abondance de calcium, sous-abondance que l'on obtient egalement. Nous obtenons cependant des surabondances depassant un facteur 10 pour les etoiles de plus de 1.4Msolar ce qui suggere qu'il existe un ou plusieurs mecanismes limitant la diffusion microscopique. La surabondance du fer en surface cause une augmentation, qui peut atteindre un facteur sept, de l'opacite a la limite de la zone convective. Ceci cause un accroissement de la temperature effective et de la masse de la zone convective comparativement aux modeles n'incluant que la diffusion de l'helium. Il s'agit la du principal effet de la diffusion sur la structure interne de ces etoiles. La diffusions n'a pas d'influence sur l'evolution de coeur stellaire dans les etoiles significativement plus massives quie le Soleil. Nous avons verife que l'utilisation de modeles consistants avec diffusion n'apporte pas d'amelioration sensible aux modeles solaires. Les forces radiatives calculees a partir des spectres d'OPAL pour les elements du pic du fer representent une fraction importante de la gravite. On obtient des forces de 40% la gravite a la base de la zone convective. Ces forces radiatives sont assez grandes pour avoir un impact significatif sur les variations d'abondance de ces elements. Cet effet est neglige dans les modeles solaires publies. Nos modeles solaires montrent que les donnees du projet OPACITE pour le fer sont trop deficientes dans leur etat actuel pour pouvoir etre utilisees dans des calculs evolutifs. Nous confirmons que la diffusion doit etre prise en compte pour reproduire les donnes helioseismologiques. Nous discutons en detail de la manipulation des donnees monochromatiques. Il en ressort que les donnees d'OPAL sont superieures aux donnees tirees de OP. Les donnees de OP sont utiles pour les forces radiatives dans deux applications. Premierement pour determiner les corrections a apporter aux accelerations radiatives de OPAL pour tenir compte de la redistribution de l'impulsion lors de la photoionisation, puis parce que le sampling de OPAL perd de sa validite a basse temperature et pour les metaux tres peu abondants. Finalement nous avons calcule des modeles d'etoiles de population II de faible metallicite. Nous montrons dans un premier temps que la diffusion des metaux n'a pas d'effet significatif sur l'evolution de ces etoiles. Nous montrons egalement que l'incertitude sur l'age des amas globulaires associe a la diffusion est sous-estimee. Quoique la difference s'amenuise il existe toujours un desaccord avec l'age de l'Univers tel que determine a partir de la loi de Hubble.

Turcotte, Sylvain

341

On the identification of liquid surface properties using liquid bridges.  

PubMed

The term liquid bridge refers to the specific silhouette of a liquid volume when it is placed between two solid surfaces. Liquid bridges have been studied extensively both theoretically and experimentally during the last century due to their significance in many technological applications. It is worth noticing that even today new technological applications based on liquid bridges continue to appear. A liquid bridge has a well-defined surface configuration dictated by a rigid theoretical foundation so the potential of its utilization as a tool to study surface properties of liquids is apparent. However, it is very scarce in literature that the use of liquid bridges is suggested as an alternative to the well-established drop techniques (pendant/sessile drop). The present work (i) presents the theoretical background for setting up a liquid-bridge based surface property estimation problem, (ii) describes the required experimental equipment and procedures and (iii) performs a thorough literature review on the subject. A case with particular interest is that of liquid bridges made of electrically conducting liquids forming between two conducting solids; such a liquid bridge presents an integral electrical conductance value which is sensitive to the specific silhouette of the bridge. This enables the use of this integral conductance as shape descriptor instead of the conventional image processing techniques. Several attempts in literature for the estimation of liquid surface tension, liquid-solid contact angle and surfactant induced surface elasticity for conducting or non/conducting liquids are presented and the prospects of the technique are discussed. PMID:24819725

Kostoglou, M; Karapantsios, T D

2014-04-24

342

Distortion of DNA cholesteric liquid crystal quenched at low temperature : geometrical analysis and models  

NASA Astrophysics Data System (ADS)

Freeze-fracture electron microscopy allows an ultrastructural analysis of deformations of a DNA cholesteric liquid crystalline sample subjected to a compressive stress applied parallel to the layers, when quickly frozen by projection onto a copper block cooled down to about 10K. A geometrical model of these deformations is proposed. After a brief recall of the usual representation of the cholesteric structure as a succession of equidistant pseudoplanes, we show that these planes are distorted into sinusoidal surfaces whose wavelength is much smaller than the cholesteric pitch and its amplitude modulated with the average molecular orientation relative to the compressive force. The consequences of these deformations regarding double twist occurrence within the structure are analysed. When the DNA concentration in the cholesteric mesophase is low, a complex helicoidal structure is observed. A relationship between these two phenomena is considered and discussed. La microscopie électronique associée à la technique de cryofracture permet une analyse ultrastructurale des déformations de l'organisation cristalline liquide cholestérique d'un échantillon d'ADN en solution : lors de la congélation par projection contre un bloc de cuivre refroidi à environ 10K par de l'hélium liquide, l'échantillon est soumis à des forces de compression parallèles à la stratification cholostérique. Nous présentons une modélisation géométrique de ces déformations. Après un bref rappel de la représentation schématique de la structure cholestérique par une série de plans fictifs, nous montrons que ces plans sont alors transformés en surfaces sinusoïdales dont la période est très inférieure au pas cholostérique et l'amplitude modulée en fonction de l'orientation relative des molécules et de la force de compression. Les conséquences de telles déformations sur l'émergence de double twist dans la structure sont examinées. Pour les plus faibles valeurs de concentration en ADN dans la phase cholestérique, nous observons des structures hélicoïdales complexes. Une relation avec le premier phénomène décrit est envisagée et discutée.

Leforestier, A.; Livolant, F.

1992-10-01

343

ANAL YSE DES STRUCTURES MAGNETIQUES ET THEORIE DES ON TWO CLASSIFICATIONS OF MAGNETIC STRUCTURES  

E-print Network

ANAL YSE DES STRUCTURES MAGNETIQUES ET THEORIE DES GRBUPES ON TWO CLASSIFICATIONS OF MAGNETIC- fication. Abstract. -A general formulation of the classification (called here C2) of magnetic structures, in a precisely defined mathematical sense, equivalent to the classification(called here Cl') based on the use

Boyer, Edmond

344

Contrle pour des systmes gouverns par des quations aux drives partielles  

E-print Network

à vapeurs (J. Watt en 1769), etc Voir l'article de James Clerk Maxwell dont l'article On governors), régulation de vitesse des machines à vapeurs (J. Watt en 1769), etc Voir l'article de James Clerk Maxwell vitesse des machines à vapeurs (J. Watt en 1769), etc Voir l'article de James Clerk Maxwell dont l

Jeanjean, Louis

345

Contribution du gros intestin la digestion des glucides et des matires azotes chez le monogastrique omnivore  

E-print Network

Contribution du gros intestin à la digestion des glucides et des matières azotées chez le-en-Josas (France). Summary. Contribution of the large intestine to the digestion of carbohydrates and proteins in omnivorous simple-stomached animals. Owing to its special situation in relation to the rest of the digestive

Paris-Sud XI, Université de

346

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

347

Table des mati`eres Cours IX. Th'eories cohomologiques des sch'emas ...................... 1  

E-print Network

sch'emas ...................... 1 IX.1. Axiomatique des cohomologies en g'eom'etrie alg'ef'erences ..............................................................* *...... 12 COURS IX TH'EORIES COHOMOLOGIQUES DES SCH'EMAS* *rtains type de sch'emas. On fixe un sch'ema de base S et on consid`ere S une sous-cat'egorie d* *e la

Deglise, Frédéric

348

//. --LES PERFORMANCES DES LASERS. STABILIT DE FRQUENCE ET PURET SPECTRALE DES LASERS  

E-print Network

and resolving power. Measurement tech- //. -- LES PERFORMANCES DES LASERS. STABILIT� DE FR�QUENCE ET PURET� SPECTRALE DES LASERS F laser peut s'apprécier selon deux critères différents : -- stabilité de fréquence, traduisant le

Boyer, Edmond

349

[TALAF-O.2] Projet des corpus crits des langues manding : le bambara, le maninka1  

E-print Network

[TALAF-O.2] 109 Projet des corpus écrits des langues manding : le bambara, le maninka1 Valentin textes en langues mandingues a démarré à St. Petersbourg en 2009. Aujourd'hui, il est effectué par une of electronic corpora for Manding languages was launched in St. Petersburg in 2009. By now, it is carried out

350

N d'ordre 1109 Interactions tritrophiques entre des Brassicaces, des  

E-print Network

'interprétation des données de génétique, et enfin Lucie Mieuzet pour l'apprentissage des techniques de génotypages Henri Carpentier pour le support logistique en serre et sur le terrain. Eric pour les réparations

Paris-Sud XI, Université de

351

Comptes Rendus des JNC 16 Toulouse 2009 Comportement mcanique de textiles tricots techniques pour des  

E-print Network

Comptes Rendus des JNC 16 Toulouse 2009 Comportement mécanique de textiles tricotés techniques pour des applications composites Mechanical behaviour of technical knitted fabrics for composite-mail : lbalea@enstimac.fr, dusserre@enstimac.fr, bernhart@enstimac.fr 2 : Textile Aéro Tarn 81360 Montredon

Paris-Sud XI, Université de

352

L'analyse des relations dynamiques entre variables : une application au taux du marché monétaire français  

Microsoft Academic Search

[fre] La détection des relations dynamiques existant entre des variables pose un problème important en économie. Des procédures statistiques, fondées sur l'étude des résidus issus de filtres ARIMA de Box et Jenkins, ont été récemment développées. Ce texte présente ces méthodes statistiques : détermination des filtres ARIMA, étude des corrélogrammes entre résidus, estimation de fonctions de transfert. Celles-ci sont ensuite

Gilbert Colletaz; William Marois

1981-01-01

353

Why liquids are fragile  

E-print Network

The fragilities (Tg-normalized temperature dependence of alpha-relaxation times) of 33 glass-forming liquids and polymers are compared for isobaric, mP, and isochoric, mV, conditions. We find that the two quantities are linearly correlated, mP = (37 +/- 3) + (0.84 +/- 0.5)mV. This result has obvious important consequences, since the ratio mV/mP is a measure of the relative degree to which temperature and density control the dynamics, Moreover, we show that the fragility itself is a consequence of the relative interplay of temperature and density effects near Tg. Specifically, strong behavior reflects a substantial contribution from density (jammed dynamics), while the relaxation of fragile liquids is more thermally-activated. Drawing on a scaling law, a physical interpretation of this result in terms of the intermolecular potential is offered.

R. Casalini; C. M. Roland

2005-03-18

354

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

355

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

356

Liquid fuel cells.  

PubMed

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. PMID:25247123

Soloveichik, Grigorii L

2014-01-01

357

RHIC The Perfect Liquid  

ScienceCinema

Evidence to date suggests that gold-gold collisions the Relativistic Heavy Ion Collider at Brookhaven are indeed creating a new state of hot, dense matter, but one quite different and even more remarkable than had been predicted. Instead of behaving like a gas of free quarks and gluons, as was expected, the matter created in RHIC's heavy ion collisions appears to be more like a "perfect" liquid.

BNL

2009-09-01

358

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 solutions—3 mixtures of ethyl alcohol, food color and water; red colored water; and pure ethyl alcohol—are 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

359

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

360

CHEMICAL IMAGES OF LIQUIDS  

Microsoft Academic Search

Following the success of electronic noses in a variety of applications related to many areas such as industrial, medical,\\u000a environmental, spatial, etc. where the objective was to construct chemical images of volatile compounds including odors, here\\u000a we introduce another system able to perform chemical images of liquids of different origin, quality, and composition. In line\\u000a with mammalian senses such as

L. Lvova; P. Paolesse; C. Di Natale; E. Martinelli; E. Mazzone; A. Orsini

361

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. PMID:25247123

2014-01-01

362

RHIC The Perfect Liquid  

SciTech Connect

Evidence to date suggests that gold-gold collisions the Relativistic Heavy Ion Collider at Brookhaven are indeed creating a new state of hot, dense matter, but one quite different and even more remarkable than had been predicted. Instead of behaving like a gas of free quarks and gluons, as was expected, the matter created in RHIC's heavy ion collisions appears to be more like a "perfect" liquid.

BNL

2008-08-12

363

Cyclic phosphonium ionic liquids  

PubMed Central

Summary 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

Mukhlall, Joshua A; Romeo, Alicia R; Gohdo, Masao; Ramati, Sharon; Berman, Marc; Suarez, Sophia N

2014-01-01

364

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.

1996-01-01

365

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

366

Liquid crystals in tribology.  

PubMed

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

Carrión, Francisco-José; Martínez-Nicolás, Ginés; Iglesias, Patricia; Sanes, José; Bermúdez, María-Dolores

2009-09-01

367

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

Carrión, Francisco-José; Martínez-Nicolás, Ginés; Iglesias, Patricia; Sanes, José; Bermúdez, María-Dolores

2009-01-01

368

Electrowetting of liquid marbles  

NASA Astrophysics Data System (ADS)

Electrowetting of water drops on structured superhydrophobic surfaces are known to cause an irreversible change from a slippy (Cassie-Baxter) to a sticky (Wenzel) regime. An alternative approach to using a water drop on a superhydrophobic surface to obtain a non-wetting system is to use a liquid marble on a smooth solid substrate. A liquid marble is a droplet coated in hydrophobic grains, which therefore carries its own solid surface structure as a conformal coating. Such droplets can be considered as perfect non-wetting systems having contact angles to smooth solid substrates of close to 180°. In this work we report the electrowetting of liquid marbles made of water coated with hydrophobic lycopodium grains and show that the electrowetting is completely reversible. Marbles are shown to return to their initial contact angle for both ac and dc electrowetting and without requiring a threshold voltage to be exceeded. Furthermore, we provide a proof-of-principle demonstration that controlled motion of marbles on a finger electrode structure is possible.

Newton, M. I.; Herbertson, D. L.; Elliott, S. J.; Shirtcliffe, N. J.; McHale, G.

2007-01-01

369

LE CHOIX DES ANTISEPTIQUES POUR LES PDILUVES DESTINS AUX BOVINS  

E-print Network

applications. On the other hand, weak organic matter resistance which seems to characterize Javel water des utilisateurs, on a donc réalisé, dans des conditions réelles d'uti- lisation, la comparaison de

Paris-Sud XI, Université de

370

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

371

Le contrôle des infections au cabinet du pédiatre  

PubMed Central

RÉSUMÉ La transmission des infections au cabinet du pédiatre est de plus en plus préoccupante. Le présent document expose les voies de transmission des infections et les principes sous-jacents aux mesures actuelles pour contrôler les infections. Pour prévenir les infections, il faut bien concevoir le cabinet et adopter des politiques administratives et de triage convenables, de même que des pratiques de base pour les soins de tous les patients (p. ex., hygiène des mains, port de gants, de masques, de lunettes de protection et d’une blouse d’hôpital pour des interventions précises; nettoyage, désinfection et stérilisation convenables des surfaces et du matériel, y compris les jouets, et techniques d’asepsie en cas d’interventions effractives) et des précautions additionnelles en cas d’infections précises. Le personnel doit avoir reçu les vaccins pertinents, et les personnes infectées doivent respecter les politiques de restriction au travail.

2008-01-01

372

La perte d'eau au cours de la rfrigration dans l'air des fruits et des lgumes La perte d'eau au cours  

E-print Network

de conservation comme les asperges et les cerises. Cette technique permet de refroidir rapidement aubergines, des poivrons, des courgettes, des concombres (340 000 tonnes), des artichauts, des asperges et (% poids) Légumes Asperge 94 Haricot vert 89 Melon 89 Tomate 94 Fruits Banane 75 Cerise 82 Orange 84 P

Paris-Sud XI, Université de

373

Application of ionic liquid in liquid phase microextraction technology.  

PubMed

Ionic liquids (ILs) are novel nonmolecular solvents. Their unique properties, such as high thermal stability, tunable viscosity, negligible vapor pressure, nonflammability, and good solubility for inorganic and organic compounds, make them excellent candidates as extraction media for a range of microextraction techniques. Many physical properties of ILs can be varied, and the structural design can be tuned to impart the desired functionality and enhance the analyte extraction selectivity, efficiency, and sensitivity. This paper provides an overview of the applications of ILs in liquid phase microextraction technology, such as single-drop microextraction, hollow fiber based liquid phase microextraction, and dispersive liquid-liquid microextraction. The sensitivity, linear calibration range, and detection limits for a range of target analytes in the methods were analyzed to determine the advantages of ILs in liquid phase microextraction. PMID:23002004

Han, Dandan; Tang, Baokun; Lee, Yu Ri; Row, Kyung Ho

2012-11-01

374

IRRADIATION DES MTAUX Par R. M. WALKER 1  

E-print Network

474. IRRADIATION DES M�TAUX Par R. M. WALKER 1 Laboratoire de Chimie Physique de la Faculté des Sciences de Paris. Résumé. 2014 On montre que la théorie simple du seuil pour les défauts par irradiation donne une description excellente des principales caractéristiques des modifications induites par l'irradiation

Boyer, Edmond

375

Amour des langues/amour de la langue Patrick Anderson  

E-print Network

Amour des langues/amour de la langue Patrick Anderson Professeur des universités UFR SLHS français dans le monde, Recherches et applications, n° 45, 2009. #12;De la disparition.... Parler d'amour des langues et d'amour de la langue, à première vue, ne concerne pas l'enseignement des langues, parce

Jeanjean, Louis

376

Etude des etats electroniques en champ magnetique dans le niveau de Landau N=0 de la tricouche ABC de graphene  

NASA Astrophysics Data System (ADS)

Dans cet ouvrage nous etudions les phases du gaz d'electrons bidimensionnel dans la tricouche de graphene en empilement ABC. En partant du modele des liaisons fortes et en faisant l'approximation du continuum autour des vallees K +, K-, nous obtenons un modele effectif a deux bandes qui permet de decrire la physique de basse energie des electrons en champ magnetique dans cette structure. Ce modele contient trois orbitales degenerees dans le niveau de Landau N = O. Ce dernier est donc 12N ?, fois degeneres en incluant les degres de liberte de spin et de vallee. En ajoutant l'interaction de Coulomb au systeme et en considerant seulement les remplissages v = -5, -4, -4, 5 afin d'avoir un systeme a trois niveaux, nous etudions le diagramme de phase du gaz d'electrons en fonction d'un biais electrique entre les couches externes. Nous trouvons une phase d'onde de densite de charge bidimensionnelle (ODC2D) comme etat fondamental du systeme. Cette ODC2D se nomme cristal dans ce memoire et nous derivons ses proprietes de transports et ses modes collectifs. Nous discutons egalement du caractere topologique de ce cristal. Notre etude englobe aussi les phases liquides avec ou sans coherence orbitale. Nous concluons notre memoire par l'etude de quelques signatures experimentales des phases du gaz d'electrons dans la tricouche.

Rondeau, Maxime

377

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

378

Synthese Spectrale de Populations Stellaires des Galaxies: Separation des Effets D'age et de Metallicite  

NASA Astrophysics Data System (ADS)

Des observations spectroscopiques de 3 galaxies elliptiques normales, 4 lenticulaires, 2 bulbes de spirales (dont celui de la Voie Lactée) et 2 elliptiques naines péculières sont analysées. Les spectres couvrent d'environ 3900 à 10000 Å, donnant accès aux raies du visible qui sont sensibles soit à la métallicité, soit à l'âge. Les largeurs équivalentes des raies sont mesurées selon deux systèmes d'indices spectroscopiques. Les mesures sont faites à plusieurs distances radiales du centre de chaque galaxie afin d'obtenir des gradients. Les indices H?, et Mg2 sont comparés à des prédictions de modèles évolutifs théoriques de populations de façon à déterminer les abondances moyennes. Par la suite, deux codes de synthèse spectrale d'optimisation sont utilisés, avec deux bibliothèques spectrales empiriques et deux bibliothèques de largeurs équivalentes (dont une théorique), pour retrouver les contributions des différentes populations stellaires aux spectres intégrés des galaxies. L'information obtenue permettra de séparer les effets d'âge des effets de métallicité et de retracer l'historique de la formation stellaire.

Delisle, Sonya

379

Generic mechanism for generating a liquid-liquid phase transition.  

PubMed

Recent experimental results indicate that phosphorus--a single-component system--can have a high-density liquid (HDL) and a low-density liquid (LDL) phase. A first-order transition between two liquids of different densities is consistent with experimental data for a variety of materials, including single-component systems such as water, silica and carbon. Molecular dynamics simulations of very specific models for supercooled water, liquid carbon and supercooled silica predict a LDL-HDL critical point, but a coherent and general interpretation of the LDL-HDL transition is lacking. Here we show that the presence of a LDL and a HDL can be directly related to an interaction potential with an attractive part and two characteristic short-range repulsive distances. This kind of interaction is common to other single-component materials in the liquid state (in particular, liquid metals), and such potentials are often used to describe systems that exhibit a density anomaly. However, our results show that the LDL and HDL phases can occur in systems with no density anomaly. Our results therefore present an experimental challenge to uncover a liquid-liquid transition in systems like liquid metals, regardless of the presence of a density anomaly. PMID:11217853

Franzese, G; Malescio, G; Skibinsky, A; Buldyrev, S V; Stanley, H E

2001-02-01

380

www.cnrs.fr Des virus mergents aux virus pandmiques  

E-print Network

JACQUES-MONOD Institut des sciences biologiques Institut écologie et environnement Information Secrétariat des Conférences Jacques-Monod CNRS Institut des sciences biologiques 3, rue Michel-Ange, F-75794 Paris Cedex 16, France E-mail : conf.monod@cnrs-dir.fr http://www.cnrs.fr/insb/cjm/ #12;

Canet, Léonie

381

Digestion des glucides chez le monogastrique Martine CHAMP  

E-print Network

Digestion des glucides chez le monogastrique Martine CHAMP Laboratoire de Techno%gie des Aliments des Animaux, /. N. R.A., Rue de la Géraudière, 44072 Nantes Cedex. Summary. Carbohydrate digestion digested in the small intestine of monogastric animals by enzymes of the salivary glands, pancreas

Paris-Sud XI, Université de

382

Une lecture enrichie des réponses aux enquêtes de conjoncture  

Microsoft Academic Search

[fre] Une lecture enrichie des réponses aux enquêtes de conjoncture . . Les enquêtes de conjoncture ont pour objectif d’appréhender, le plus rapidement et le plus simplement possible, les évolutions récentes et probables de l'activité économique. La plupart des questions posées amènent des réponses qualitatives à trois modalités (qualification d’une évolution: en hausse \\/ stable \\/ en baisse). Les indicateurs

François Hild

2002-01-01

383

Les déterminants du jugement des salariés sur la RTT  

Microsoft Academic Search

[fre] Les déterminants du jugement des salariés sur la RTT . . Si de nombreux travaux ont déjà été consacrés aux conséquences économiques des politiques de réduction du temps de travail (RTT), notamment sur l’emploi, peu d’études ont jusqu’ici abordé les effets de ces politiques sur les conditions de travail et les conditions de vie des salariés concernés. Plusieurs études

Gilbert Cette; Nicolas Dromel; Dominique Méda

2004-01-01

384

Mesure des missions gazeuses au stockage de lisier porcin  

E-print Network

Mesure des émissions gazeuses au stockage de lisier porcin Sandrine ESPAGNOL (1), Laurence LOYON (2 technique de Delphine Loiseau (1) et Frédéric Guyomard (1) Mesure des émissions gazeuses au stockage de carbone (CO2) au stockage de lisiers porcins, et mesurer les variations temporelles et spatiales des

Paris-Sud XI, Université de

385

Cartographie des graphes de terrain par une approche proxmique  

E-print Network

Cartographie des graphes de terrain par une approche proxémique Bruno Gaume 10 décembre 2009 1 des particules qui cartographient les propriétés structurelles des graphes étudiés. Cette méthode). Cartographier la forme du sens dans les petits mondes lexicaux. JADT. [Watts and Strogatz, 1998] Watts, D. J

Grigoras, .Romulus

386

High Performance Liquid Chromatography  

NASA Astrophysics Data System (ADS)

High performance liquid chromatography (HPLC) has many applications in food chemistry. Food components that have been analyzed with HPLC include organic acids, vitamins, amino acids, sugars, nitrosamines, certain pesticides, metabolites, fatty acids, aflatoxins, pigments, and certain food additives. Unlike gas chromatography, it is not necessary for the compound being analyzed to be volatile. It is necessary, however, for the compounds to have some solubility in the mobile phase. It is important that the solubilized samples for injection be free from all particulate matter, so centrifugation and filtration are common procedures. Also, solid-phase extraction is used commonly in sample preparation to remove interfering compounds from the sample matrix prior to HPLC analysis.

Talcott, Stephen

387

Levitation in paramagnetic liquids  

NASA Astrophysics Data System (ADS)

Magnetic levitation of diamagnetic and paramagnetic substances in a paramagnetic liquid is explored. Materials ranging from graphite to tin and copper can be made to float at ambient temperature in concentrated solutions of dysprosium nitrate, when an electromagnet or four-block permanent magnet array is used to produce a gradient field. Simulations illustrate the stable regions for levitation above the permanent magnets; and a novel eight-block configuration is proposed, which allows denser materials such as gold or lead to be levitated.

Dunne, P. A.; Hilton, J.; Coey, J. M. D.

2007-09-01

388

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

389

Etude des possibilits d'utilisation agronomique des composts d'ordures mnagres en milieu tropical (1)  

E-print Network

Etude des possibilités d'utilisation agronomique des composts d'ordures ménagères en milieu'avère nécessaire uniquement en saison sèche pour obtenir un compost dont le rapport C/N se situe autour de Ordures les composts des paysompos age. industrialisés. La proportion équilibrée des oligo-éléments et la

Paris-Sud XI, Université de

390

Les effets de l'intensification de la production laitière sur le revenu des exploitations et des familles agricoles  

Microsoft Academic Search

[fre] L'auteur s'est proposé d'étudier les effets de l'intensification de la production laitière sur le revenu des exploitations et des familles agricoles. L'étude a porté sur l'échantillon des exploitations du RICA ayant en 1978 l'OTE Bovin-Lait et 20 à 50 hectares de superficie ; l'échantillon a été partagé en groupes, selon le degré d'intensification des exploitations, repéré par le chargement

Jean-Pierre Butault

1981-01-01

391

DTERMINATION DE L'IMPULSION DES PROTONS DANS LE NOYAU PAR L'TUDE CINMATIQUE DES COLLISIONS QUASI LASTIQUES  

E-print Network

7. D�TERMINATION DE L'IMPULSION DES PROTONS DANS LE NOYAU PAR L'�TUDE CIN�MATIQUE DES COLLISIONS grandes énergies avec émission d'un proton en vue de déterminer la distribution en impulsion des protons à permet en particulier d'obtenir les impulsions des protons dans le noyau, toutefois, elle est assez

Paris-Sud XI, Université de

392

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

393

Ionic liquids in confined geometries.  

PubMed

Over recent years the Surface Force Apparatus (SFA) has been used to carry out model experiments revealing structural and dynamic properties of ionic liquids confined to thin films. Understanding characteristics such as confinement induced ion layering and lubrication is of primary importance to many applications of ionic liquids, from energy devices to nanoparticle dispersion. This Perspective surveys and compares SFA results from several laboratories as well as simulations and other model experiments. A coherent picture is beginning to emerge of ionic liquids as nano-structured in pores and thin films, and possessing complex dynamic properties. The article covers structure, dynamics, and colloidal forces in confined ionic liquids; ionic liquids are revealed as a class of liquids with unique and useful confinement properties and pertinent future directions of research are highlighted. PMID:22301770

Perkin, Susan

2012-04-21

394

Criteria for solvate ionic liquids.  

PubMed

Certain concentrated mixtures of salts and solvents are not simply "solutions" anymore, but they may be described as "ionic liquids". In this perspective paper, we describe possible criteria for the new family of ionic liquids: "solvate" ionic liquids. This subclass of ionic liquids was originally proposed by Angell et al. in their recent review; however, their criteria remain to be debated. Concentrated mixtures of lithium salts and organic solvents are useful models for these solvate ionic liquids, and the effects of the salt concentration, types of solvents, and counter anions of the lithium salts on their structure and properties have been explored to enable contrast with traditional solutions, and to help determine whether a given mixture belongs to the solvate ionic liquid or not. PMID:24676567

Mandai, Toshihiko; Yoshida, Kazuki; Ueno, Kazuhide; Dokko, Kaoru; Watanabe, Masayoshi

2014-05-21

395

TUDE COMPARE DES ACIDES GRAS RAMIFIS DES ALIMENTS ET DU LAIT, CHEZ LA VACHE  

E-print Network

�TUDE COMPAR�E DES ACIDES GRAS RAMIFI�S DES ALIMENTS ET DU LAIT, CHEZ LA VACHE S. KUZDZAL expérimental de 7 vaches laitières. Les acides ramifiés des lipides alimentaires et du lait ont été dosés par chromatographie en phase gazeuse. On a ensuite calculé les quantités d'acides gras ramifiés ingérés et sécrétés au

Boyer, Edmond

396

Liquid atomization in supersonic flows  

NASA Astrophysics Data System (ADS)

An experimental investigation of the atomization of a round liquid jet by coaxial, costream injection into a supersonic, Mach 1.5 air flow is reported. Extensive flow visualization was conducted using schlieren/shadowgraph, flash photography, and short duration (ns) laser imaging. The finer details of the jet were revealed when viewed under high magnification with the help of a microscope. The liquid and air pressures were varied individually. Photographic evidence indicates the presence of three regions within the liquid jet: a primary region enclosed by the first shock cell where the primary breakup occurs, a secondary region in which the jet is totally broken because of its interaction with the supersonic wave structure, and a third, subsonic region further downstream. It was found that the breakup mechanism of liquid jets in supersonic airstreams is quite complex. The breakup seems to be initiated by the growth of the turbulent structure on the liquid surface and the subsequent detachment of the three-dimensional structure as fine droplets by the intense shear at the liquid-gas interface. This seems to confirm the boundary layer stripping mechanism. The liquid jet expands into a bubble like formation as it interacts with the first set of waves. Higher liquid injection pressures resulted in higher initial spray angles. The liquid jet displayed a geometry strongly dependent on the pressure distribution resulting from the wave structure present in the supersonic jet. Droplet size and velocity distributions were measured by the P/DPA (Phase/Doppler Particle Analyzer) system. The Sauter Mean Diameter (SMD) was measured at several axial and radial locations at various liquid and air pressures. The SMD shows a decrease with increase in both the air-to-liquid mass flow ratio and the Weber number. The drop size decreased towards the outer edges of the jet. The results lead one to conclude that the coaxial, coflowing configuration is very attractive for atomizing scramjet liquid fuels.

Missoum, Azzedine

397

Solute diffusion in liquid metals  

NASA Technical Reports Server (NTRS)

A gas model of diffusion in liquid metals is presented. In this model, ions of liquid metals are assumed to behave like the molecules in a dense gas. Diffusion coefficient of solute is discussed with reference to its mass, ionic size, and pair potential. The model is applied to the case of solute diffusion in liquid silver. An attempt was made to predict diffusion coefficients of solutes with reasonable accuracy.

Bhat, B. N.

1973-01-01

398

Liquid monobenzoxazine based resin system  

SciTech Connect

The present invention provides a liquid resin system including a liquid monobenzoxazine monomer and a non-glycidyl epoxy compound, wherein the weight ratio of the monobenzoxazine monomer to the non-glycidyl epoxy compound is in a range of about 25:75 to about 60:40. The liquid resin system exhibits a low viscosity and exceptional stability over an extended period of time making its use in a variety of composite manufacturing methods highly advantageous.

Tietze, Roger; Nguyen, Yen-Loan; Bryant, Mark

2014-10-07

399

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

400

motrice du couple. J'ai d'ailleurs remarqu que le zinc orclinaire donne partout des rsultats plus variables que le zinc amalgam.  

E-print Network

449 motrice du couple. J'ai d'ailleurs remarqué que le zinc orclinaire donne partout des résultats plus variables que le zinc amalgamé. Le liquide que j'ai choisi, au moins provisoirement, est la dis. La force électromotrice du couple zinc amalgamé-cuivre-eau salée est 0volt, 82 entre + 5° C. et + 40

Paris-Sud XI, Université de

401

Einfuhrung Die Monte-Carlo-Simulation des Pfadintegrals Anwendung Ausblick Monte-Carlo-Simulation des Pfadintegrals in der  

E-print Network

Einf¨uhrung Die Monte-Carlo-Simulation des Pfadintegrals Anwendung Ausblick Monte-Carlo Humboldt-Universit¨at zu Berlin 20. Januar 2010 Christian Wiese Monte-Carlo-Simulation des Pfadintegrals #12;Einf¨uhrung Die Monte-Carlo-Simulation des Pfadintegrals Anwendung Ausblick Inhaltsverzeichnis 1

402

Colloque National AFPS 2011 Ecole des Ponts ParisTech Cartographie automatique des classes de sol l'chelle  

E-print Network

8ème Colloque National AFPS 2011 ­ Ecole des Ponts ParisTech Cartographie automatique des classes méthode de cartographie automatique simplifiée des classes de sol d'après une adaptation au contexte uninvestigated zones in order establish a preliminary cartography of the site classes. However, for site

Paris-Sud XI, Université de

403

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.

404

COLE CENTRALE DES ARTS ET MANUFACTURES  

E-print Network

de surveillance de l'ADN et analyse des interrégulations entre le mécanisme de surveillance de l'ADN l'intégrité de l'ADN et d'autre part la répartition équitable du génome dupliqué dans les cellules checkpoint du fuseau mitotique, tandis que les checkpoints de l'ADN sont activés suite à des lésions de l'ADN

Paris-Sud XI, Université de

405

Encapsulated ionic liquids (ENILs): from continuous to discrete liquid phase.  

PubMed

Encapsulated ionic liquid (ENIL) material was developed, consisting of ionic liquid (IL) introduced into carbon submicrocapsules. ENILs contain >85% w/w of IL but discretized in submicroscopic encapsulated drops, drastically increasing the surface contact area with respect to the neat fluid. ENIL materials were here tested for gas separation processes, obtaining a drastic increase in mass transfer rate. PMID:22935733

Palomar, Jose; Lemus, Jesus; Alonso-Morales, Noelia; Bedia, Jorge; Gilarranz, Miguel A; Rodriguez, Juan J

2012-10-14

406

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

407

Liquid Crystal Lens of Two Liquid Crystal Layers  

Microsoft Academic Search

Liquid crystal lenses(LCL)of two liquid crystal(LC)layers with parallel and orthogonal optic axes are built. The LCL of two LC layers with parallel optic axes is designed to obtain larger focusing power, and that with orthogonal optic axes is to focus light wave of arbitrary polarizations. The focal lengths of both LCLs can be controlled by external voltages.

Susumu Sato

2004-01-01

408

SAMPLE PREPARATION FOR HIGH PERFORMANCE LIQUID CHROMATOGRAPHY: RECENT PROGRESS  

Microsoft Academic Search

In recent years, substantial research has been devoted to the development of new liquid-liquid microextraction methods for sample preparation. These microextration methods were performed by several techniques such as: liquid-phase microextraction (LPME) or membrane-assisted solvent extraction (MASE), hollow fiber liquid phase microextraction (HF-LPME), single drop-phase microextraction (SDME), liquid-liquid-liquid-microextraction (LLLME), dispersive liquid-liquid microextraction (DLLME), and ionic liquid dispersive liquid-liquid microextraction (IL-DLLM).

Simona Codruta Cobzac; Simion Gocan

2011-01-01

409

Biologie des pucerons des crales dans l'Ouest de la France. III. Action des hymnoptres parasites  

E-print Network

parasites sur les populations de Sitobion avenae F., Metopolo- phium dirhodum Wlk. et Rhopalosiphum padi L. Aphidius uzbekistanicus est le principal parasite primaire des 3 pucerons les plus importants ; A. ervi, A'attaquent à ces auxiliaires. Les populations de différents parasites primaires évoluent souvent de façon

Paris-Sud XI, Université de

410

Les Stock-options en faveur des dirigeants : dterminants d'octroi et impact sur la performance des entreprises, le cas franais  

E-print Network

Les Stock-options en faveur des dirigeants : déterminants d'octroi et impact sur la performance des-Dauphine (Janvier 2007) Résumé Ce papier a comme premier objectif, l'analyse des déterminants de l'octroi des stock nouvelles attributions des stock-options sur la performance subséquente de la firme. Sur la base des données

Paris-Sud XI, Université de

411

Laboratoire de Gologie et Gestion des Ressources Minrales et Energtiques (G2R) Facult des sciences & techniques 54500 Vandoeuvre ls Nancy France  

E-print Network

CARDON Datation Re-Os sur pyrite et traçage des sources des métaux dans des gisements de type porphyre et ubiquiste du système : la pyrite. L'application de cette méthodologie sur les pyrites des minéralisations'ébullition maximale. Une répartition similaire des teneurs en arsenic des pyrites a pu y être observée. Une

Paris-Sud XI, Université de

412

Entropy-driven liquid–liquid separation in supercooled water  

PubMed Central

Twenty years ago Poole et al. suggested that the anomalous properties of supercooled water may be caused by a critical point that terminates a line of liquid–liquid separation of lower-density and higher-density water. Here we present a thermodynamic model based on this hypothesis, which describes all available experimental data for supercooled water with better quality and fewer adjustable parameters than any other model. Liquid water at low temperatures is viewed as an ‘athermal solution' of two molecular structures with different entropies and densities. Alternatively to popular models for water, in which liquid–liquid separation is driven by energy, the phase separation in the athermal two-state water is driven by entropy upon increasing the pressure, while the critical temperature is defined by the ‘reaction' equilibrium constant. The model predicts the location of density maxima at the locus of a near-constant fraction of the lower-density structure. PMID:23056905

Holten, V.; Anisimov, M. A.

2012-01-01

413

Traitement Automatique des Langues Naturelles, Marseille, 2014 Induction de sens pour enrichir des ressources lexicales  

E-print Network

the senses not covered in Bangla WordNet. Mots-cl´es : Induction de sens, bengali, Weka, Clustering. Keywords: Word Sense Induction, Bangla, Weka, Clustering. 1 Introduction En traitement automatique des langues

414

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

415

Complexation des actinides (III, IV et V) par des acides organiques.  

E-print Network

??L’acquisition de données structurales et thermodynamiques relatives à des systèmes actinides (An(III), Pu(IV) Pa(V))–acides organiques polyfonctionnels (citrique, NTA, DTPA), en solution aqueuse, vise à une… (more)

Leguay, Sébastien

2012-01-01

416

Complexation des actinides (III, IV et V) par des acides organiques.  

E-print Network

??L'acquisition de données structurales et thermodynamiques relatives à des systèmes actinides (An(III), Pu(IV) Pa(V))-acides organiques polyfonctionnels (citrique, NTA, DTPA), en solution aqueuse, vise à une… (more)

Leguay, Sébastien

2012-01-01

417

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

E-print Network

, Dômes, Trachyandésite, Trachyte, Tephra, Minéralogie, Pollens, Préhistoire. Abstract : The impact, Chaîne des Puys, Limagne, Volcanism, Maars, Domes, Trachyandesite, Trachyte, Tephra, Mineralogy, Pollen

Paris-Sud XI, Université de

418

La structuration des territoires sous contrainte des risques Les risques dits naturels, lment de  

E-print Network

@wanadoo.fr Mots-clés : morcellement urbain, fragmentation urbaine, endommagements, gestion des risques, vulné 300 000 habitants, les Managuas, laissent, eux, plutôt supposer que le morcellement du tissu urbain et

Paris-Sud XI, Université de

419

Method of foaming a liquid metal  

DOEpatents

The addition of a small quantity of barium to liquid metal NaK or sodium has been found to promote foam formation and improve bubble retention in the liquid metal. A stable liquid metal foam will provide a more homogeneous liquid metal flow through the channel of a two-phase liquid metal MHD power generator to improve operating efficiency.

Fischer, Albert K. (Western Springs, IL); Johnson, Carl E. (Elk Groove Village, IL)

1980-01-01

420

Liquidity Risk Premia in Corporate Bond Markets  

Microsoft Academic Search

This paper explores the role of liquidity risk in the pricing of corporate bonds. We show that corporate bond returns have signicant exposures to uctuations in treasury bond liquidity and equity market liquidity. Further, this liquidity risk is a priced factor for the expected returns on corporate bonds, and the associated liquidity risk premia help to explain the credit spread

Frank de Jong; Joost Driessen

421

Liquid-liquid transition in a strong bulk metallic glass-forming liquid  

NASA Astrophysics Data System (ADS)

Polymorphic phase transitions are common in crystalline solids. Recent studies suggest that phase transitions may also exist between two liquid forms with different entropy and structure. Such a liquid-liquid transition has been investigated in various substances including water, Al2O3-Y2O3 and network glass formers. However, the nature of liquid-liquid transition is debated due to experimental difficulties in avoiding crystallization and/or measuring at high temperatures/pressures. Here we report the thermodynamic and structural evidence of a temperature-induced weak first-order liquid-liquid transition in a bulk metallic glass-forming system Zr41.2Ti13.8Cu12.5Ni10Be22.5 characterized by non- (or weak) directional bonds. Our experimental results suggest that the local structural changes during the transition induce the drastic viscosity changes without a detectable density anomaly. These changes are correlated with a heat capacity maximum in the liquid. Our findings support the hypothesis that the ‘strong’ kinetics (low fragility) of a liquid may arise from an underlying lambda transition above its glass transition.

Wei, Shuai; Yang, Fan; Bednarcik, Jozef; Kaban, Ivan; Shuleshova, Olga; Meyer, Andreas; Busch, Ralf

2013-07-01

422

Une analyse économétrique des liens entre l'inflation, le chômage et la nature des anticipations  

Microsoft Academic Search

[fre] L'objet de cet article est de soumettre à des tests empiriques les trois theses : keynesienne, monétariste, Nouvelle économie classique, en utilisant une procédure suggérée et appliquée par J. Stein. Après avoir mis en lumière les liens entre ces trois thèses et les approches formulées en matière de formation des anticipations, nous montrons qu'en matière d'explication du chômage aucune

Jean-Pierre Gourlaouen

1983-01-01

423

SUR UNE MTHODE DE DTERMINATION DU DEGR DE DE PENDANCE DES DESINTGRATIONS DES ATOMES DE POLONIUM  

E-print Network

SUR UNE M�THODE DE D�TERMINATION DU DEGR� DE DE PENDANCE DES DESINT�GRATIONS DES ATOMES DE POLONIUM. Thibaud a enregistré à l'oscillographe les désintégrations d'atomes de polonium en utilisant une source nombre élevé de désintégrations d'atomes de polonium (plus de 17 000), l'existence d'écarts systématiques

Paris-Sud XI, Université de

424

LE CONTENTIEUX DES ACCIDENTS DE SKI DANS LA RESPONSABILITE DES COMMUNES  

E-print Network

stations de ski alpin. Avec l'accroissement de la pratique de ce sport, les accidents de ski se sont1 LE CONTENTIEUX DES ACCIDENTS DE SKI DANS LA RESPONSABILITE DES COMMUNES (histoire d montagne, c'est qu'elle a découvert les joies du ski. Cette nouvelle activité s'est très vite transformée

Boyer, Edmond

425

Prise en charge des ruptures traumatiques des corps caverneux au sein d'une population militaire  

PubMed Central

Le but de ce travail rétrospectif était de préciser les résultats de notre prise en charge des traumatismes du corps caverneux au cours des huit dernières années. De Janvier 2000 à Février 2008, 32 malades ont été opérés pour une rupture traumatique des corps caverneux. Nous avons analysé: l’âge, le mécanisme, le délai de consultation, la présentation clinique, la technique opératoire, le siège de la rupture et les lésions associées, l’évolution immédiate et les suites lointaines. Avec un recul moyen de 42 mois (12 à 84 mois), les patients étaient jeunes (23 à 51 ans), le faux pas du coït était le mécanisme le plus fréquent (21 malades) 65,6% suivi la tentative de dissimuler une érection (18,7%) (06maldes). Nos malades avaient tous consultés dans les heures qui suivaient (délai d'hospitalisation < 19 heures). 02/32 malades, soit 6,25%, avaient des urèthrorragies en plus de la présentation typique (hématome, déviation de la verge). La rupture albuginéale était située à droite chez 50% des patients, à gauche dans 43,7% (14cas) et bilatérale chez deux patients. Le siège de la rupture était proximal dans 100% des cas (32hommes). L'incision élective était notre choix dans 93,75% des cas (30 malades).. Les suites lointaines étaient favorables, hormis un gène sexuel les 06 premiers mois chez 37,4% (12maldes). La simple suture albuginéale après évacuation de l'hématome par voie élective, en dehors des cas compliqués de lésions urétrales ou vus tardivement, semblait apporter les meilleurs résultats anatomiques et fonctionnels. PMID:25489365

Alami, Mohammed; Janane, Abdellatif; Ghadouane, Mohamed; Ameur, Ahmed; Abbar, Mohamed

2014-01-01

426

Bilan de la digestion des matires azotes du lait et des bactries cultives sur mthanol  

E-print Network

Bilan de la digestion des matières azotées du lait et des bactéries cultivées sur méthanol à la fin digestion at the end of the small intestine and the digestive tract of the preruminant calf. Two milk and synthetic amino acids (bacteria diet). Nine Friesian bull calves were used : digestibility was measured

Paris-Sud XI, Université de

427

Des monstres soumettre ! Les prdateurs dans l'imaginaire des naturalistes au XIXe  

E-print Network

étaient proches d'autres groupements, notamment les carnivores et les nuisibles qui ne se nourrissent mammifères carnivores, comprenant le chat, la loutre, l'hyène, l'ours..., caractérisés par des canines oiseaux carnivores sont rassemblés dans un `super-ordre' des rapaces, un terme forgé au Moyen �ge du latin

Paris-Sud XI, Université de

428

SUR LES PROPRITS OPTIQUES ET PHOTOLECTRIQUES DES COUCHES MINCES ET DES MONOCRISTAUX DE CADMIUM  

E-print Network

CADMIUM Par Mme SONJA ROBIN-KANDARE, JEAN ROBIN et SACHA KANDARE, Laboratoire de Physique, Faculté des Sciences, Dakar, République du Sénégal. Résumé. - On étudie l'absorption de couches minces de cadmium non couches minces de cadmium. On interprète la courbe d'absorption, délimite le domaine des transitions

Paris-Sud XI, Université de

429

Etat des lieux des mycobactérioses atypiques au Burkina Faso: résultats d'une enquête régionale  

PubMed Central

Introduction L’étude avait pour but de déterminer la fréquence d'isolement des mycobactéries atypiques chez les patients déclarés tuberculeux pulmonaire à microscopie positive (TPM+) au Burkina Faso. Méthodes Il s'est agit d'une étude transversale qui s'est déroulée de mars 2011 à février 2012. Les patients TPM+ de plus de 15 ans ont été inclus dans l’étude de manière systématique dans les centres de diagnostic et de traitement (CDT) de la région sanitaire des Hauts Bassins. Une culture des mycobactéries et une identification biochimique ont été réalisées sur les échantillons des patients TPM+ La sérologie VIH a été réalisée par des tests rapides. Résultats Une fréquence de 11% (8/73) de mycobactéries atypiques et 89,0% (65/73) de mycobactéries du complexe tuberculosis ont été identifiées des 73 patients TPM+ inclus dans l’étude. La tranche d’âge de 20 à 40 ans était la plus touchée par les mycobactérioses en général et constituait 48% de l’échantillon. Nous avons trouvé 12,2% (8 / 66) de patients VIH positif, 83,3% (55 / 66) de patients VIH négatif et 4,5% (3 / 66) de patients dont le statut VIH était indéterminé. Conclusion Notre étude a mis en lumière l'implication des mycobactéries atypiques dans la pathogénie de certains patients déclarés TPM+. Le rôle des mycobactéries atypiques dans les infections pulmonaires est probablement sous estimé et devra être examiné avec plus de détails et sur un échantillon plus grand. PMID:25396014

Zida, Sylvie; Tarnagda, Zékiba; Kaboré, Antoinette; Zingué, Dézémon; Hien, Hervé; Sanou, Adama; Michel Gomgnimbou, Kireopori; Nouctara, Moumini; Ouédraogo, Mamoudou; Ouédraogo, Oumarou; Godreuil, Sylvain; Méda, Nicolas

2014-01-01

430

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

431

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

PubMed

Liquid-liquid extraction of actinides and lanthanides by use of ionic liquids is reviewed, considering, first, phenomenological aspects, then looking more deeply at the various mechanisms. Future trends in this developing field are presented. PMID:21203752

Billard, Isabelle; Ouadi, Ali; Gaillard, Clotilde

2011-06-01

432

Contrôle du marché informel à l’heure de la mondialisation des échanges. Le cas des antirétroviraux au Chili  

PubMed Central

Résumé Les nouveaux médicaments pour le VIH/sida ont créé des besoins d’accessibilité aux traitements que les gouvernements n’ont pas toujours réussi à couvrir. Il en résulte l’émergence d’un marché informel des ARV. Par l’analyse de la situation au Chili, nous traitons des différents créneaux d’approvisionnement, des conséquences de l’existence d’un tel marché, ainsi que des moyens envisageables pour réduire les effets indésirables. Les aspects tant microéconomiques que macroéconomiques concernant le marché et l’accessibilité aux médicaments sont abordés. PMID:23997580

Brousselle, Astrid; Morales, Cristián

2013-01-01

433

Apport des neutrons à l'analyse structurale des composés partiellement désordonnés  

NASA Astrophysics Data System (ADS)

La cristallographie est un outil extrêmement puissant qui pourrait être utilisé par de nombreux scientifiques dont les sujets de recherche sont en fait très éloignés. L'évolution des techniques ces dernières années a relégué par exemple la cristallographie des rayons X des petites molécules à un rôle mineur, un rôle de service. Certains ont même le sentiment semble-t-il que toutes les connaissances sont contenues dans de multiples logiciels capables par eux-mêmes de conduire une analyse structurale à un résultat correct unique. Il est souhaitable que chacun soit capable de réaliser l'étude structurale du composé qui l'intéresse et bien entendu nécessaire de comprendre ce que l'on fait, la qualité des résultats et leur analyse en dépend. L'objet de cette présentation est de montrer l'apport spécifique de la diffraction de neutrons sur monocristaux à l'étude du désordre, en particulier des atomes d'hydrogène, et ses conséquences sur la compréhension des propriétés physiques, à partir de développements et d'exemples récents.

Cousson, A.

2003-02-01

434

Comprendre la maltraitance des aînés en pratique familiale  

PubMed Central

Résumé Objectif Présenter ce qui constitue la maltraitance des aînés, ce dont les médecins de famille devraient être au courant, les signes et les symptômes laissant présager de mauvais traitements chez des adultes plus âgés, comment l’outil Elder Abuse Suspicion Index peut aider à détecter la maltraitance et les options qui existent pour réagir en cas de soupçons de maltraitance. Sources des données On a fait une recension dans MEDLINE, PsycINFO et Social Work Abstracts pour trouver des publications en français ou en anglais, de 1970 à 2011, à l’aide des expressions elder abuse, elder neglect, elder mistreatment, seniors, older adults, violence, identification, detection tools et signs and symptoms. Les publications pertinentes ont fait l’objet d’un examen. Message principal La maltraitance des aînés est une cause importante de morbidité et de mortalité chez les adultes plus âgés. Si les médecins de famille sont bien placés pour détecter des mauvais traitements infligés aux aînés, leurs taux réels de signalement de cas de maltraitance sont plus faibles que dans d’autres professions. Cette situation pourrait s’améliorer s’ils comprenaient mieux les genres d’agissements qui constituent de la maltraitance des aînés, ainsi que les signes et les symptômes observés au bureau qui pourraient pointer vers des cas de mauvais traitements. La détection de tels cas pourrait être facilitée par le recours à un court outil validé, comme l’Elder Abuse Suspicion Index. Conclusion Les médecins de famille peuvent jouer un rôle plus important dans la détection d’une éventuelle maltraitance des aînés. Une fois qu’on soupçonne de mauvais traitements, il existe dans la plupart des communautés des services sociaux ou des forces de l’ordre accessibles pour effectuer des évaluations plus approfondies et intervenir.

Yaffe, Mark J.; Tazkarji, Bachir

2012-01-01

435

Thermal Conductivity of Liquid Ozone  

Microsoft Academic Search

The thermal conductivity of liquid ozone has been determined experimentally. A value of 5.31×10—4 cal\\/(sec)(cm2)(°C\\/cm) at —183°C is reported. This value and values measured at three other temperatures are compared with published data for the thermal conductivity of liquid oxygen.

Thomas E. Waterman; Donald P. Kirsh; Robert I. Brabets

1958-01-01

436

Preservation of Liquid Biological Samples  

NASA Technical Reports Server (NTRS)

The present invention provides a method of preserving a liquid biological sample, comprising the step of: contacting said liquid biological sample with a preservative comprising, sodium benzoate in an amount of at least about 0.15% of the sample (weight/volume) and citric acid in an amount of at least about 0.025% of the sample (weight/volume).

Putcha, Lakshmi (Inventor); Nimmagudda, Ramalingeshwara R. (Inventor)

2000-01-01

437

Lithium-loaded liquid scintillators  

SciTech Connect

The invention is directed to a liquid scintillating composition containing (i) one or more non-polar organic solvents; (ii) (lithium-6)-containing nanoparticles having a size of up to 10 nm and surface-capped by hydrophobic molecules; and (iii) one or more fluorophores. The invention is also directed to a liquid scintillator containing the above composition.

Dai, Sheng (Knoxville, TN); Kesanli, Banu (Mersin, TR); Neal, John S. (Knoxville, TN)

2012-05-15

438

Atomization of a liquid jet  

Microsoft Academic Search

The jet atomization process has various applications, including liquid fuel injection in internal combustion engines, spray coatings of protective materials on surfaces, and sprays of pesticides. Here, the stability of a liquid jet issued into an ambient gas is investigated with respect to spatially growing disturbances. The results are used to explain the existence of the intact length, the formation

S. P. Lin; D. J. Kang

1987-01-01

439

Level Indicator for Liquid Helium  

Microsoft Academic Search

A capacitor probe was developed for locating the level of liquid helium ; in a Dewar vessel. The problem of the very small difference in dielectric ; constant between liquid and gaseous helium is solved by complete guarding of the ; connecting cables and measuring probe except the capacitor. The capacitance ; meter is set at zero when the capacitor

S. Meiboom; J. P. O'Brien

1963-01-01

440

Variable Capacitance Liquid Level Sensors  

Microsoft Academic Search

The properties of continuous variable capacitance liquid level gauges are analyzed, and the interrelations of hydraulic and electrical properties are examined. The analysis covers both conductive and nonconductive liquids and considers the “flowback” effects found in dynamic level fluctuations (such as waves and slosh). Design rules are given.

L. Bruce Wilner

1960-01-01

441

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

442

Liquid lift for the Shuttle  

Microsoft Academic Search

After the operational failure of a Solid Rocket Booster (SRB) led to the Space Shuttle Challenger accident, NASA reexamined the use of liquid-fueled units in place of the SRBs in order to ascertain whether they could improve safety and payload. In view of favorable study results obtained, the posibility has arisen of employing a common liquid rocket booster for the

Richard Demeis

1989-01-01

443

Effets des electrons secondaires sur l'ADN  

NASA Astrophysics Data System (ADS)

Les interactions des electrons de basse energie (EBE) representent un element important en sciences des radiations, particulierement, les sequences se produisant immediatement apres l'interaction de la radiation ionisante avec le milieu biologique. Il est bien connu que lorsque ces radiations deposent leur energie dans la cellule, elles produisent un grand nombre d'electrons secondaires (4 x 104/MeV), qui sont crees le long de la trace avec des energies cinetiques initiales bien inferieures a 20 eV. Cependant, il n'y a jamais eu de mesures directes demontrant l'interaction de ces electrons de tres basse energie avec l'ADN, du principalement aux difficultes experimentales imposees par la complexite du milieu biologique. Dans notre laboratoire, les dernieres annees ont ete consacrees a l'etude des phenomenes fondamentaux induits par impact des EBE sur differentes molecules simples (e.g., N2, CO, O2, H2O, NO, C2H 4, C6H6, C2H12) et quelques molecules complexes dans leur phase solide. D'autres travaux effectues recemment sur des bases de l'ADN et des oligonucleotides ont montre que les EBE produisent des bris moleculaires sur les biomolecules. Ces travaux nous ont permis d'elaborer des techniques pour mettre en evidence et comprendre les interactions fondamentales des EBE avec des molecules d'interet biologique, afin d'atteindre notre objectif majeur d'etudier l'effet direct de ces particules sur la molecule d'ADN. Les techniques de sciences des surfaces developpees et utilisees dans les etudes precitees peuvent etre etendues et combinees avec des methodes classiques de biologie pour etudier les dommages de l'ADN induits par l'impact des EBE. Nos experiences ont montre l'efficacite des electrons de 3--20 eV a induire des coupures simple et double brins dans l'ADN. Pour des energies inferieures a 15 eV, ces coupures sont induites par la localisation temporaire d'un electron sur une unite moleculaire de l'ADN, ce qui engendre la formation d'un ion negatif transitoire dans un etat electronique dissociatif, cette localisation est suivie d'une fragmentation. A plus haute energie, la dissociation dipolaire (i.e., la formation simultanee d'un ion positif et negatif) et l'ionisation jouent un role important dans le dommage de l'ADN. L'ensemble de nos resultats permet d'expliquer les mecanismes de degradation de l'ADN par les EBE et d'obtenir des sections efficaces effectives des differents types de dommages.

Boudaiffa, Badia

444

Liquid droplet generation  

NASA Technical Reports Server (NTRS)

A pre-prototype segment of a droplet sheet generator for a liquid droplet radiator was designed, constructed and tested. The ability to achieve a uniform, non-diverging droplet sheet is limited by manufacturing tolerances on nozzle parallelism. For an array of 100, 100 micrometer diameters nozzles spaced 5 stream diameters apart, typical standard deviations in stream alignment were plus or minus 10 mrad. The drop to drop fractional speed variations of the drops in typical streams were similar and independent of position in the array. The absolute value of the speed dispersion depended on the amplitude of the disturbance applied to the stream. A second generation preliminary design of a 5200 stream segment of a droplet sheet generator was completed. The design is based on information developed during testing of the pre-prototype segment, along with the results of an acoustical analysis for the stagnation cavity pressure fluctuations used to break-up the streams into droplets.

Muntz, E. P.; Orme, Melissa; Farnham, Tony; Vandiep, G. Pham; Huerre, P.

1989-01-01

445

Ionic liquids as surfactants  

NASA Astrophysics Data System (ADS)

Problems of self-assembling in systems containing ionic liquids (ILs) are discussed. Main attention is paid to micellization in aqueous solutions of dialkylimidazolium ILs and their mixtures with classical surfactants. Literature data are reviewed, the results obtained by the authors and co-workers are presented. Thermodynamic aspects of the studies and problems of molecular-thermodynamic modeling receive special emphasis. It is shown that the aggregation behavior of dialkylimidazolium ILs is close to that of alkyltrimethylammonium salts (cationic surfactants) though ILs have a higher ability to self-organize, especially as it concerns long-range ordering. Some aspects of ILs applications are outlined where their common features with classical surfactants and definite specificity are of value.

Smirnova, N. A.; Safonova, E. A.

2010-10-01

446

Flame spread across liquids  

NASA Technical Reports Server (NTRS)

Recent reviews of our understanding of flame spread across liquids show that there are many unresolved issues regarding the phenomenology and causal mechanisms affecting ignition susceptibility, flame spread characteristics, and flame spread rates. One area of discrepancy is the effect of buoyancy in both the uniform and pulsating spread regimes. The approach we have taken to resolving the importance of buoyancy for these flames is: (1) normal gravity (1g) and microgravity (micro g) experiments; and (2) numerical modeling at different gravitational levels. Of special interest to this work, as discussed at the previous workshop, is the determination of whether, and under what conditions, pulsating spread occurs in micro g. Microgravity offers a unique ability to modify and control the gas-phase flow pattern by utilizing a forced air flow over the pool surface.

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

1995-01-01

447

Directed line liquids  

SciTech Connect

This thesis is devoted to the study of ensembles of dense directed lines. These lines are principally to be thought of as polymers, though they also have the morphology of flux lines in high temperature superconductors, strings of colloidal spheres in electrorheological fluids and the world lines of quantum mechanical bosons. The authors discuss how directed polymer melts, string-like formations in electrorheological and ferro-fluids, flux lines in high temperature superconductors and the world lines of quantum mechanical bosons all share similar descriptions. They study a continuous transition in all of these systems, and then study the critical mixing properties of binary mixtures of directed polymers through the renormalization group. They predict the exponents for a directed polymer blend consolute point and a novel two-phase superfluid liquid-gas critical point.

Kamien, R.D.

1992-01-01

448

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

449

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

450

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

451

Separation of organic liquids  

SciTech Connect

The method is described comprising: concentrating a charge solution containing methanol and either dimethyl carbonate or methyl t-butyl ether oxygenate by, maintaining a membrane of non-porous separating layer of cast polyvinyl alcohol which has been crosslinked with an aliphatic polyaldehyde containing at least three carbon atoms including those in the aldehyde groups; maintaining a pressure drop across the non-porous separating layer of polyvinyl alcohol; passing a charge aqueous solution containing methanol and either dimethyl carbonate or methyl t-butyl ether oxygenate into contact with the high pressure side of the non-porous separating layer of polyvinyl alcohol having properties which enable at least a portion of the methanol in the charge solution and a lesser portion of oxygenate to pass by pervaporation through the non-porous separating layer of polyvinyl alcohol as a lean mixture containing more methanol and less oxygenate than are present in the charge solution and the charge solution is converted to a rich liquid containing less methanol and more oxygenate than are present in the charge solution; recovering as permeate from the low pressure side of the non-porous separating layer of polyvinyl alcohol the lean mixture containing more methanol and less oxygenate than are present in the charge solution, the lean mixture being recovered in vapor phase at a pressure below the vapor pressure thereof; and recovering as retentate from the high pressure side of the non-porous separating layer the rich liquid containing a lower methanol content and a higher oxygenate content than are present in the charge solution.

Pasternak, M.; Bartels, C.R.; Reale, J. Jr.

1989-01-17

452

Le microscope des mathmaticiens Tribune du Net  

E-print Network

cette "tribune" Interactif ! Deux parties : 1 les TIC du chercheur TIC = Technologies de l'Information et de la Communication #12;Contenu de cette "tribune" Interactif ! Deux parties : 1 les TIC du chercheur TIC = Technologies de l'Information et de la Communication 2 ordinateur : le microscope des

Theyssier, Guillaume

453

RPERCUSSIONS DES AVITAMINOSES SUR LE DVELOPPEMENT EMBRYONNAIRE  

E-print Network

'oiseau par le fait que l'incubation ne permet pas la synthèse des vitamines, à l'exception de la niacine. Il'influence de la niacine ou de la biotine sur le dé- veloppement embryonnaire. 3. - Toute avitaminose aiguë

Paris-Sud XI, Université de

454

La difficile maîtrise des excédents agricoles  

Microsoft Academic Search

[fre] Des excédents agricoles difficiles à maîtriser . La production agricole française s'est accrue à raison de tg % par an entre 1 959 et 1 991 . Grâce à la Politique agricole commune, la Communauté initialement déficitaire est devenue auto-suffisante sur de nombreux produits. . Mais la politique de soutien par les prix avec garantie de débouchés s'est avérée

Laurent Bisault; Véronique Ardouin; Patrick Redor

1992-01-01

455

Die intravenöse Eisenbelastung als Funktionsprobe des RES  

Microsoft Academic Search

Zusammenfassung Intravenös injiziertes Kolloideisen wird schnell aus der Blutbahn eliminiert und im RES deponiert. Die Geschwindigkeit dieses Eisenabstroms aus dem zirkulierenden Blut in das Gewebe läßt sich am Abfall der Serumeisenkonzentration bestimmen und für einen bestimmten Zeitraum nach der Eisenapplikation als Halbwertzeit angeben. Sie beträgt normalerweise 40 bis 55 Minuten, ist bei entzündlichen Alterationen und bei Hyperplasien des RES stark

I. Hoppe; W. Götte; C. Demke; E. Jahn; K. Schweikart; H. Overkamp

1961-01-01

456

Energetik des Brütens beim Star ( Sturnus vulgaris )  

Microsoft Academic Search

Zusammenfassung Der Energieaufwand eines Vogels für das Bebrüten des Geleges ist noch immer Gegenstand einer Kontroverse: Muß der Vogel die notwendige Wärme für die Eier zusätzlich zu seinem normalen Verbrauch produzieren oder reicht der normale Stoffwechsel aus, um die Wärme zur Verfügung zu stellen?

Herbert Biebach

1979-01-01

457

prsente la Facult des Sciences & Techniques  

E-print Network

a collaboration with the University of Newcastle (Australia), the turbulent wake f & �nergétique par Thiesset Fabien Exploration analytique et expérimentale des interactions cohérence-turbulence de complexité croissant. Les attentions se portent sur les interactions cohérence - turbulence, en

Paris-Sud XI, Université de

458

Jules Verne L'COLE DES ROBINSONS  

E-print Network

................................. 13 III Où la conversation de Phina Hollaney et de Godfrey Morgan est accompagnée au piano navire .................58 VIII Qui conduit Godfrey à de chagrines réflexions sur la manie des voyages ............................................................................82 X Où Godfrey fait ce que tout autre naufragé eût fait en pareille circonstance

HarÂ?El, Zvi

459

Titel des Moduls : Theoretische Akustik/ Theoretical Acoustics  

E-print Network

Titel des Moduls : Theoretische Akustik/ Theoretical Acoustics LP (nach ECTS): 6 Kurzbezeichnung Literatur: 1. P.M. Morse and K.U. Ingard, 1968. Theoretical Acoustics. McGraw Hill Inc., Princeton University Press, New Jersey, USA. ISBN 0-691-02401-4. 2. E. Skudrzyk,1971. The Foundations of Acoustics

Berlin,Technische Universität

460

Die Flügelbefiederung des Bleßhuhns (Fulica atra L.)  

Microsoft Academic Search

Zusammenfassung Es werden die Anordnung und das Aussehen der Konturfedern am Flügel des Bleßhuhns (Fulica a. atra L.) beschrieben und erörtert. Die Verhältnisse beiFulica a. australis, F. americana undF. cristata stimmen damit überein. Zum Vergleich wurden nochCrex crex, Porzana porzana, Rallus aquaticus undGallinula chloropus untersucht.

Hans Jeikowski

1971-01-01

461

Ecole Doctorale des Sciences et de Technologie  

E-print Network

cellules à pigment photosensible (en anglais DSSC, Dye-Sensitized Solar Cell). En 1991, Grätzel a réintroduit l'effet photo- électrochimique en développant la première DSSC, une des cellules solaire troisième

Paris-Sud XI, Université de

462

CARTOGRAPHIE STRATGIQUE DES ACTIONS DE DVELOPPEMENT DURABLE  

E-print Network

1 CARTOGRAPHIE STRAT�GIQUE DES ACTIONS DE D�VELOPPEMENT DURABLE : LE CAS DE PME FRAN�AISES Stéphane cartographie stratégique, cette recherche permet de synthétiser graphiquement les indicateurs de développement identifiés. Mots clés : Développement durable, Global Reporting Initiative, Pacte Mondial, Cartographie

Paris-Sud XI, Université de

463

Thrapies innovantes : la croise des sciences  

E-print Network

humanitaire a besoin de la recherche Olympisme. L'or pour �ric Monnin Cloud computing : des informations la recherche académique. L'analyse de 174 articles scientifiques lui révèle que les sujets étudiés ne

Jeanjean, Louis

464

Durchstarten in Hamburg Strukturen des Arbeitsmarktes  

E-print Network

Durchstarten in Hamburg Strukturen des Arbeitsmarktes Annedore Bröker Team Akademische Berufe #12;2 Hamburg ist wirtschaftlich und wissenschaftlich ein Spitzenstandort... Frank Horch, Wirtschaftssenator Leben möchten viele junge Leute in Berlin, aber wer Geld verdienen will, kommt nach Hamburg... Babette

Hamburg,.Universität

465

VALUATION DE DIVERS TRAITEMENTS TECHNOLOGIQUES DES CRALES  

E-print Network

céréales crues. 1/inemcacité d'une supplémentation directe des aliments amylacés en amylases exogènes physicochimiques de l'amidon (ANDERSOX et al., 1970: MERCIER, 1971) le rendent plus sensible aux amylases, donc

Paris-Sud XI, Université de

466

PRINCIPALES CARACTERISTIQUES PHYSIONOMIQUES FLORISTIQUES DES FORMATIONS FORESTIERES  

E-print Network

AUBREVILLE (1938). Les formations forestières s'y caractérisent par leur diversité et par leur morcellement. Photo 1. - Diversité et morcellement des formations forestières à Lamto ; au second plan, à gauche et à

Paris-Sud XI, Université de

467

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

468

Magnetically focused liquid drop radiator  

DOEpatents

A magnetically focused liquid drop radiator for application in rejecting rgy 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, Thomas E. (Fairfax, VA); Powell, James R. (Shoreham, NY); Lenard, Roger (Redondo Beach, CA)

1986-01-01

469

Whipping of electrified liquid jets.  

PubMed

We apply an electric field to a moderately conducting liquid surrounded by another coflowing liquid, all inside a glass-based microfluidic device, to study nonaxisymmetric instabilities. We find that the bending of the electrified jet results in a steady-state, helicoidal structure with a constant opening angle. Remarkably, the characteristic phase speed of the helicoidal wave only depends on the charge carried by the jet in the helicoidal region and its stability critically depends on the properties of the coflowing liquid. In fact, the steady-state helical structure becomes chaotic when the longest characteristic time is that of the inner liquid rather than that of the outer coflowing liquid. We also perform a numerical analysis to show that the natural preference of the jet is to adopt the conical helix structure observed experimentally. PMID:25201984

Guerrero, Josefa; Rivero, Javier; Gundabala, Venkata R; Perez-Saborid, Miguel; Fernandez-Nieves, Alberto

2014-09-23

470

Liquid identification by Hilbert spectroscopy  

NASA Astrophysics Data System (ADS)

Fast and reliable identification of liquids is of great importance in, for example, security, biology and the beverage industry. An unambiguous identification of liquids can be made by electromagnetic measurements of their dielectric functions in the frequency range of their main dispersions, but this frequency range, from a few GHz to a few THz, is not covered by any conventional spectroscopy. We have developed a concept of liquid identification based on our new Hilbert spectroscopy and high- Tc Josephson junctions, which can operate at the intermediate range from microwaves to THz frequencies. A demonstration setup has been developed consisting of a polychromatic radiation source and a compact Hilbert spectrometer integrated in a Stirling cryocooler. Reflection polychromatic spectra of various bottled liquids have been measured at the spectral range of 15-300 GHz with total scanning time down to 0.2 s and identification of liquids has been demonstrated.

Lyatti, M.; Divin, Y.; Poppe, U.; Urban, K.

2009-11-01

471

Impact des coupes forestières sur l'écologie des jeunes stades de vie chez la perchaude (Perca Flavescens) : perspectives pour la survie et le recrutement des populations.  

E-print Network

??Les hypothèses actuelles en science halieutique prédisent un fort recrutement des populations de poissons lorsque les conditions environnementales favorisent la croissance rapide durant les jeunes… (more)

Leclerc, Véronique

2010-01-01

472

Impact des coupes forestières sur l'écologie des jeunes stades de vie chez la perchaude (Perca flavescens) : perspectives pour la survie et le recrutement des populations.  

E-print Network

??Les hypothèses actuelles en science halieutique prédisent un fort recrutement des populations de poissons lorsque les conditions environnementales favorisent la croissance rapide durant les jeunes… (more)

Leclerc, Véronique

2010-01-01

473

Low gravity liquid motions in spacecraft  

NASA Astrophysics Data System (ADS)

Low gravity liquid motions in a spacecraft are discussed in outline form and on viewgraphs. Free-surface sloshing, liquid draining, liquid reorientation, and sloshing in a bladdered tank are covered. Conclusions and recommendations are given.

Dodge, Franklin T.

1987-09-01

474

Multilayer liquid spreading on superhydrophilic nanostructured surfaces  

E-print Network

A phenomenon is presented where a propagating liquid on an array of nanopillars with scalloped features can separate into multiple layers of liquid films. The scallops were found to act as energy barriers that favor liquid ...

Xiao, Rong

475

Low gravity liquid motions in spacecraft  

NASA Technical Reports Server (NTRS)

Low gravity liquid motions in a spacecraft are discussed in outline form and on viewgraphs. Free-surface sloshing, liquid draining, liquid reorientation, and sloshing in a bladdered tank are covered. Conclusions and recommendations are given.

Dodge, Franklin T.

1987-01-01

476

Rglement d'organisation Facult des lettres 2013 REGLEMENT D'ORGANISATION  

E-print Network

Règlement d'organisation Faculté des lettres 2013 REGLEMENT D'ORGANISATION de la FACULTE DES sexes. #12;Règlement d'organisation Faculté des lettres 2013 2 REGLEMENT D'ORGANISATION - FACULTE DES LETTRES CHAPITRE I : SUBDIVISIONS DE LA FACULTE DES LETTRES Article 1 ­ Organisation de la Faculté

Halazonetis, Thanos

477

Situation economique et sociale des immigrants au Canada : recherche et elaboration de donnees a Statistique Canada  

Microsoft Academic Search

Au cours des 25 dernieres annees, on a assiste a une degradation plus ou moins permanente de la situation economique des nouveaux immigrants au Canada. Toutefois, la situation economique des Canadiens de deuxieme generation (les enfants des immigrants) est plus positive. De plus, apres quatre annees passees au Canada et en depit de difficultes economiques, la plupart des immigrants qui

Garnett Picot

2008-01-01

478

Stratégies de localisation résidentielle des ménages et mobilité domicile-travail  

Microsoft Academic Search

PROBLEMATIQUE - Ces dernières décennies ont été fortement marquées en France par le mouvement bien identifié de la périurbanisation. Cette expansion urbaine s'accompagne d'une reconfiguration des localisations des fonctions urbaines, entraînant une modification des déplacements qui leur sont liés. Largement confortée par le spectaculaire développement de la motorisation, elle pose des problèmes de maîtrise des flux dans la mesure où

Odile Andan; Pascal Pochet; Jean-Louis Routhier; Scheou Bernard

1999-01-01

479

Des recommandations probantes pour surveiller l’innocuité des antipsychotiques de deuxième génération chez les enfants et les adolescents  

PubMed Central

HISTORIQUE : Au Canada, l’utilisation d’antipsychotiques, notamment les antipsychotiques de deuxième génération (ADG), a augmenté de façon considérable depuis cinq ans chez les enfants ayant des troubles de santé mentale. Ces médicaments ont le potentiel de causer de graves complications métaboliques et neurologiques lorsqu’on les utilise de manière chronique. OBJECTIF : Synthétiser les données probantes relatives aux effets secondaires métaboliques et neurologiques précis associés à l’usage d’ADG chez les enfants et fournir des recommandations probantes sur la surveillance de ces effets secondaires. MÉTHODOLOGIE : Les auteurs ont procédé à une analyse systématique des essais cliniques contrôlés des ADG auprès d’enfants. Ils ont fait des recommandations à l’égard de la surveillance de l’innocuité des ADG d’après un modèle de classification fondé sur le système GRADE (système de notation de l’évaluation et de l’élaboration des recommandations). Lorsque les données probantes n’étaient pas suffisantes, ils fondaient leurs recommandations sur le consensus et l’avis d’experts. Un groupe consensuel multidisciplinaire a analysé toutes les données probantes pertinentes et est parvenu à un consensus à l’égard des recommandations. RÉSULTATS : Les recommandations probantes portant sur la surveillance de l’innocuité des ADG figurent dans les présentes lignes directrices. Les auteurs indiquent la qualité des recommandations relatives à des examens physiques et tests de laboratoire précis à l’égard de chaque ADG à des moments déterminés. CONCLUSION : De multiples essais aléatoires et contrôlés ont permis d’évaluer l’efficacité de bon nombre des ADG utilisés pour traiter les troubles de santé mentale en pédiatrie. Toutefois, leurs avantages ne sont pas sans risques : on observe à la fois des effets secondaires métaboliques et neurologiques chez les enfants traités au moyen d’ADG. Le risque de prise de poids, d’augmentation de l’indice de masse corporelle et de taux lipidiques anormaux est plus élevé à l’utilisation d’olanzapine, suivie de la clozapine et de la quétiapine. Quant au risque d’effets secondaires neurologiques des traitements, il est plus élevé à l’utilisation de rispéridone, d’olanzapine et d’aripiprazole. Des interventions de surveillance pertinentes des effets secondaires amélioreront la qualité des soins des enfants traités à l’aide de ces médicaments. PMID:24082813

Pringsheim, Tamara; Panagiotopoulos, Constadina; Davidson, Jana; Ho, Josephine

2012-01-01

480

Ferroelectric Liquid Crystal Chemistry: Cyanohydrin Ether and Cyanoalkyl Ferroelectric Liquid Crystals; Synthesis and Liquid Crystal Properties  

Microsoft Academic Search

From simple symmetry arguments it can be predicted that tilted chiral smectic liquid crystals should exhibit ferroelectric polarization. While these predictions are found to hold true, the symmetry arguments do not lead insight into the molecular origins of this phenomena. Such insight is necessary to allow the directed design of new high-performance ferroelectric liquid crystal materials is to be achieved.

Kirk Frederick Eidman

1988-01-01

481

Nouvelle approche à la prise en charge des condylomes  

PubMed Central

Résumé Objectif Faire le résumé des anciens et des nouveaux moyens de traitement des verrues génitales ou condylomes et déterminer comment les utiliser de manière appropriée. Sources des données Une recherche documentaire a été effectuée dans les bases de données suivantes: MEDLINE, PubMed, EMBASE, base de données des synthèses systématiques et registre central des études contrôlées de la Collaboration Cochrane (en anglais), ACP Journal Club et Trip. Les bibliographies des articles extraits ont aussi été examinées. Les études cliniques, les articles de révision qualitative, les rapports consensuels et les guides de pratique clinique ont été retenus. Message principal Les verrues symptomatiques sont présentes chez au moins 1 % des personnes âgées entre 15 et 49 ans et on estime que jusqu’à 50 % des gens sont infectés par le virus du papillome humain à un moment donné de leur vie. L’imiquimod et la podophyllotoxine sont 2 nouveaux traitements pour les verrues génitales externes qui sont moins douloureux et peuvent être appliqués par les patients à la maison. De plus, il a été démontré que le vaccin quadrivalent contre le virus du papillome humain est efficace pour prévenir les condylomes et le cancer du col. Les plus anciennes méthodes thérapeutiques ont aussi leur place dans certaines situations, comme les verrues intravaginales, urétrales, anales ou récalcitrantes ou encore pour les patientes enceintes. Conclusion Les nouveaux traitements des verrues génitales externes peuvent réduire la douleur causée par la thérapie et le nombre de visites au cabinet. Les autres méthodes thérapeutiques demeurent utiles dans certaines situations.

Lopaschuk, Catharine C.

2013-01-01

482

Étude par détection de photons des processus électroniques au sein d'une jonction tunnel dans un milieu moléculaire  

NASA Astrophysics Data System (ADS)

Analysis of the luminescence induced by a STM (scanning tunneling microscope) permits to get insights into the electronic processes taking place in a single nanoscopic tunnel junction. We studied a Au(111)/Au junction under vacuum (UHV) and immersed in a molecular medium. The study under UHV reveals the influence of spatial variations of surface local density of states (LDOS) on the luminescence. The emission at the solid-liquid interface is characterized and the role played by the dielectric function is shown. Time correlations between the emitted single photons are then studied. Depending on the liquid immersing the junction, a photon bunching can occur. We link this bunching with structural changes of the junction induced by the presence of a diffusing molecule. If the HOMO LUMO gap of the molecule is small enough, resonant tunnelling paths exist and tunnelling-electron bunching occurs. Finally, the influence of a self-assembled monolayer on the substrate is investigated. Boundings between triphenylene derivatives and Au(111) are too weak, but with chemisorbed alcanethiols, molecular resolution is reached both on the STM image and on the photon map. We show that the contrast on photon map comes from the modulation of the LDOS spatial extension into the barrier due to the S Au bond. The elaboration of organic multilayers is considered as a route for observing the electroluminescence of a single molecule, isolated from the substrate by thiols and to study correlations of electronic origin. We have already optically characterised such a layer using C{60}. La luminescence induite par STM (microscopie à effet tunnel) est une source d'informations d'une grande richesse sur les processus électroniques au sein d'un objet nanoscopique individuel. Nous nous sommes intéressés à une jonction Au/Au(111) sous vide puis dans un milieu moléculaire. L'étude sous vide a permis de montrer l'influence des variations spatiales des densités d'états de la surface. L'émission à l'interface liquide-solide a été démontrée et le rôle de la fonction diélectrique du solvant mis en évidence. Nous avons ensuite étudié les corrélations temporelles entre les photons émis. Selon le liquide environnant la jonction, les photons peuvent être émis par paquets. Nous relions ce phénomène à la modification structurelle de la jonction induite par la présence d'une molécule et à la différence d'énergie entre ses orbitales frontières. Si elle est assez faible, des chemins tunnel résonants existent et les électrons traversent la barrière par paquets. L'influence d'une couche auto-assemblée sur le substrat est étudiée. Des dérivés de triphénylènes interagissent trop faiblement avec Au(111), mais avec des alcanethiols chimisorbés, la résolution moléculaire est atteinte simultanément sur l'image STM et la carte de photons. Nous montrons que le contraste sur cette dernière provient de la modulation de l'extension spatiale à l'intérieur de la barrière des densités d'état locales due à la liaison S Au. L'élaboration de multicouches organiques est alors envisagée pour observer l'électroluminescence d'une molécule unique, isolée du substrat par les thiols et étudier des corrélations d'origine électronique. Nous avons déjà caractérisé optiquement une telle couche de C{60}.

Perronet, K.

2005-03-01

483

Friction-formed liquid droplets.  

PubMed

The formation of nanoscale liquid droplets by friction of a solid is observed in real-time. This is achieved using a newly developed in situ transmission electron microscope (TEM) triboprobe capable of applying multiple reciprocating wear cycles to a nanoscale surface. Dynamical imaging of the nanoscale cyclic rubbing of a focused-ion-beam (FIB) processed Al alloy by diamond shows that the generation of nanoscale wear particles is followed by a phase separation to form liquid Ga nanodroplets and liquid bridges. The transformation of a two-body system to a four-body solid-liquid system within the reciprocating wear track significantly alters the local dynamical friction and wear processes. Moving liquid bridges are observed in situ to play a key role at the sliding nanocontact, interacting strongly with the highly mobile nanoparticle debris. In situ imaging demonstrates that both static and moving liquid droplets exhibit asymmetric menisci due to nanoscale surface roughness. Nanodroplet kinetics are furthermore dependent on local frictional temperature, with solid-like surface nanofilaments forming on cooling. TEM nanotribology opens up new avenues for the real-time quantification of cyclic friction, wear and dynamic solid-liquid nanomechanics, which will have widespread applications in many areas of nanoscience and nanotechnology. PMID:21289398

Lockwood, A J; Anantheshwara, K; Bobji, M S; Inkson, B J

2011-03-11

484

Polymer single crystal membrane from liquid/liquid interface  

NASA Astrophysics Data System (ADS)

Vesicles, mimicking the structure of cell membrane at the molecular scale, are small membrane-enclosed sacks that can store or transport substances. The weak mechanical properties and the nature of environment-sensitivity of the current available vesicles: liposomes, polymersomes, colloidsomes limit their applications as an excellent candidate for targeting delivery of drugs/genes in biomedical engineering and treatment. Recently, we developed an emulsion-based method to grow curved polymer single crystals. Varying the polymer concentration and/or the emulsification conditions (such as surfactant concentration, water-oil volume ratio), curved crystals with different sizes and different openness could be obtained. This growing process was attributed to polymer crystal growth along the liquid/liquid interface. In addition, the liquid/liquid interfacial crystal growth is promising for synthesis of enclosed hollow sphere.

Wang, Wenda; Li, Christopher

2013-03-01

485

Purification of gangliosides by liquid-liquid partition chromatography.  

PubMed

A liquid-liquid partition chromatographic technique was applied to separate amphiphilic glycolipids. A two-phase solvent system composed of n-butanol-t-butyl methyl ether-acetonitrile-water at a volume ratio of 3:1:1:5 was found to be suitable for separating the gangliosides from total lipids extracted from rat brain by liquid-liquid partition chromatographic systems, namely centrifugal partition chromatography (CPC) and high-speed counter-current chromatography. GM1 could be separated rapidly by using the upper phase as stationary phase for both systems. Moreover, various kinds of gangliosides (GM1, GD1a, GD1b, GT1b) could be separated individually by using the lower phase as stationary phase by CPC. The sample can be recovered without loss by these systems. PMID:18645211

Kato, Tomohisa; Hatanaka, Kenichi

2008-11-01

486

Application of ionic liquids in liquid chromatography and electrodriven separation.  

PubMed

Ionic liquids (ILs) are salts in the liquid state at ambient temperature, which are nonvolatile, nonflammable with high thermal stability and dissolve easily for a wide range of inorganic and organic materials. As a kind of potential green solvent, they show high efficiency and selectivity in the field of separation research, especially in instrumental analysis. Thus far, ILs have been successfully applied by many related researchers in high-performance liquid chromatography and capillary electrophoresis as chromatographic stationary phases, mobile phase additives or electroosmotic flow modifiers. This paper provides a detailed review of these applications in the study of natural products, foods, drugs and other fine chemicals. Furthermore, the prospects of ILs in liquid chromatographic and electrodriven techniques are discussed. PMID:23833208

Huang, Yi; Yao, Shun; Song, Hang

2013-08-01

487

Electrophoretic transport of biomolecules across liquid-liquid interfaces  

NASA Astrophysics Data System (ADS)

The mass transfer resistance of a liquid-liquid interface in an aqueous two-phase system composed of poly(ethylene glycol) and dextran is investigated. Different types of proteins and DNA stained with fluorescent dyes serve as probes to study the transport processes close to the interface. A microfluidic device is employed to enable the electrophoretic transport of biomolecules from one phase to another. The results obtained for proteins can be explained solely via the different electrophoretic mobilities and different affinities of the molecules to the two phases, without any indications of a significant mass transfer resistance of the liquid-liquid interface. By contrast, DNA molecules adsorb to the interface and only desorb under an increased electric field strength. The desorption process carries the signature of a thermally activated escape from a metastable state, as reflected in the exponential decay of the fluorescence intensity at the interface as a function of time.

Hahn, Thomas; Münchow, Götz; Hardt, Steffen

2011-05-01

488

Electrokinetic Transport in Ionic Liquids  

E-print Network

A key difficulty in understanding electrokinetic transport in ionic liquids lies in the construction of an appropriate reference dynamics. The common assumption of modelling ion dynamics as a Langevin process is not warranted for solvent-free ionic liquids. The electrokinetic transport of ionic liquids obtained by coarse graining a simple exclusion process defined on a lattice is considered. The resulting dynamical equations can be written as a gradient flow with a degenerate mobility function. This form of the mobility function gives rise to charging behaviours that are different to the ones known in electrolytic solutions; the predicted behaviours agree qualitatively with the phenomenology observed in simulations.

Lee, Alpha A; Goriely, Alain

2015-01-01

489

Cooling balloons with liquid nitrogen  

NASA Astrophysics Data System (ADS)

We present an undergraduate level experiment in which the radius of a rubber balloon is measured as it is cooled with liquid nitrogen. For balloons filled with simple gases that condense at liquid nitrogen temperatures, we found that the volume decreases linearly with time. We compared our measurements with a simplified model based on elementary kinetic theory and thermodynamics that explains this behavior. Students are encouraged to test the validity of the model by repeating the experiment using gas mixtures and gases that do not condense at liquid nitrogen temperatures.

Moreno, A. J.; Ferrari, H.; Bekeris, V.

2010-12-01

490

Measurements in liquid fuel sprays  

NASA Technical Reports Server (NTRS)

Techniques for studying the events directly preceding combustion in the liquid fuel sprays are being used to provide information as a function of space and time on droplet size, shape, number density, position, angle of flight and velocity. Spray chambers were designed and constructed for: (1) air-assist liquid fuel research sprays; (2) high pressure and temperature chamber for pulsed diesel fuel sprays; and (3) coal-water slurry sprays. Recent results utilizing photography, cinematography, and calibration of the Malvern particle sizer are reported. Systems for simultaneous measurement of velocity and particle size distributions using laser Doppler anemometry interferometry and the application of holography in liquid fuel sprays are being calibrated.

Chigier, N.

1984-01-01

491

Controlled release liquid dosage formulation  

DOEpatents

A liquid dual coated dosage formulation sustained release pharmaceutic having substantial shelf life prior to ingestion is disclosed. A dual coating is applied over controlled release cores to form dosage forms and the coatings comprise fats melting at less than approximately 101.degree. F. overcoated with cellulose acetate phthalate or zein. The dual coated dosage forms are dispersed in a sugar based acidic liquid carrier such as high fructose corn syrup and display a shelf life of up to approximately at least 45 days while still retaining their release profiles following ingestion. Cellulose acetate phthalate coated dosage form cores can in addition be dispersed in aqueous liquids of pH <5.

Benton, Ben F. (Centerburg, OH); Gardner, David L. (Bellville, OH)

1989-01-01

492

Etude du processus de changement vecu par des familles ayant decide d'adopter volontairement des comportements d'attenuation des changements climatiques  

NASA Astrophysics Data System (ADS)

Les activites humaines energivores telles l'utilisation intensive de l'automobile, la surconsommation de biens et l'usage excessif d'electricite contribuent aux changements climatiques et autres problemes environnementaux. Bien que plusieurs recherches rapportent que l'etre humain est de plus en plus conscient de ses impacts sur le climat de la planete, ces memes recherches indiquent qu'en general, les gens continuent a se comporter de facon non ecologique. Que ce soit a l'ecole ou dans la communaute, plusieurs chercheurs en education relative a l'environnement estiment qu'une personne bien intentionnee est capable d'adopter des comportements plus respectueux de l'environnement. Le but de cette these etait de comprendre le processus d'integration de comportements d'attenuation des changements climatiques dans des familles. A cette fin, nous nous sommes fixe deux objectifs : 1) decrire les competences et les procedes qui favorisent l'adoption de comportements d'attenuation des changements climatiques dans des familles et 2) decrire les facteurs et les dynamiques familiales qui facilitent et limitent l'adoption de comportements d'attenuation des changements climatiques dans des familles. Des familles ont ete invitees a essayer des comportements personnels et collectifs d'attenuation des changements climatiques de sorte a integrer des modes de vie plus ecologiques. Sur une periode de huit mois, nous avons suivi leur experience de changement afin de mieux comprendre comment se produit le processus de changement dans des familles qui decident volontairement d'adopter des comportements d'attenuation des changements climatiques. Apres leur avoir fourni quelques connaissances de base sur les changements climatiques, nous avons observe le vecu de changement des familles durant huit mois d'essais a l'aide de journaux reflexifs, d'entretiens d'explicitation et du journal du chercheur. La these comporte trois articles scientifiques. Dans le premier article, nous presentons une recension des ecrits sur le changement de comportement en environnement. Nous explorons egalement la famille comme systeme fonctionnel de sorte a mieux comprendre ce contexte d'action environnementale qui est, a notre connaissance, peu etudie. Dans le deuxieme article, nous presentons nos resultats de recherche concernant les facteurs d'influence observes ainsi que les competences manifestees au cours du processus d'adoption de nouveaux comportements environnementaux dans trois familles. Enfin, le troisieme article presente les resultats du cas d'une quatrieme famille ou les membres vivent depuis longtemps des modes de vie ecologique. Dans le cadre d'une demarche d'analyse par theorisation ancree, l'etude de ce cas modele nous a permis d'approfondir les categories conceptuelles identifiees dans le deuxieme article de sorte a produire une modelisation de l'integration de comportements environnementaux dans le contexte de la famille. Les conclusions degagees grace a la recension des ecrits nous ont permis d'identifier les elements qui pourraient influencer l'adoption de comportements environnementaux dans des familles. La recension a aussi permis une meilleure comprehension des divers facteurs qui peuvent affecter l'adoption de comportements environnementaux et, enfin, elle a permis de mieux cerner le phenomene de changement de comportement dans le contexte de la famille consideree comme un systeme. En appliquant un processus d'analyse inductif, a partir de nos donnees qualitatives, les resultats de notre etude multi-cas nous ont indique que deux construits conceptuels semblent influencer l'adoption de comportements environnementaux en famille : 1) les valeurs biospheriques communes au sein de la famille et 2) les competences collectivement mises a profit collectivement durant l'essai de nouveaux comportements environnementaux. Notre modelisation du processus de changement dans des familles indique aussi qu'une dynamique familiale collaborative et la presence d'un groupe de soutien exterieur sont deux elements conceptuels qui tendent a influencer les deux princi

Leger, Michel T.

493

Imaging stratifying liquid–liquid flow by capacitance tomography  

Microsoft Academic Search

Electrical capacitance tomography offers a non-intrusive technique for on-line visualisation of two-phase liquid–liquid flows. It has been applied on a facility which provides metered flows of water and kerosene to a test section at the start of which they pass through a dispersing multi-hole orifice plate. The test section consists of a sudden expansion with an internal diameter of 63 mm

Norpaiza M. Hasan; Barry J. Azzopardi

2007-01-01

494

Crystal templating through liquid-liquid phase separation.  

PubMed

Controlled induction of crystal nucleation is a highly desirable but elusive goal. Attempts to speed up crystallization, such as high super saturation or working near a liquid-liquid critical point, always led to irregular and uncontrollable crystal growth. Here, we show that under highly nonequilibrium conditions of spinodal decomposition, water crystals grow as thin wires in a template-less formation of "Haareis". This suggests that such nonequilibrium conditions may be employed more widely as mechanisms for crystal growth control. PMID:25466237

Mosses, Joanna; Turton, David A; Lue, Leo; Sefcik, Jan; Wynne, Klaas

2015-01-21

495

Comment on "Spontaneous liquid-liquid phase separation of water"  

NASA Astrophysics Data System (ADS)

Yagasaki et al. [Phys. Rev. E 89, 020301 (2014), 10.1103/PhysRevE.89.020301] present results from a molecular dynamics trajectory illustrating coarsening of ice, which they interpret as evidence of transient coexistence between two distinct supercooled phases of liquid water. We point out that neither two distinct liquids nor criticality are demonstrated in this simulation study. Instead, the illustrated trajectory is consistent with coarsening behaviors analyzed and predicted in earlier work by others.

Limmer, David T.; Chandler, David

2015-01-01

496

Energy conversion at liquid/liquid interfaces: artificial photosynthetic systems  

NASA Technical Reports Server (NTRS)

This chapter focuses on multielectron reactions in organized assemblies of molecules at the liquid/liquid interface. We describe the thermodynamic and kinetic parameters of such reactions, including the structure of the reaction centers, charge movement along the electron transfer pathways, and the role of electric double layers in artificial photosynthesis. Some examples of artificial photosynthesis at the oil/water interface are considered, including water photooxidation to the molecular oxygen, oxygen photoreduction, photosynthesis of amphiphilic compounds and proton evolution by photochemical processes.

Volkov, A. G.; Gugeshashvili, M. I.; Deamer, D. W.

1995-01-01

497

Linoleic acid from safflower oil by liquid-liquid extraction  

Microsoft Academic Search

Summary  Tests conducted on a pilot-plant scale have demonstrated that linoleic acid of about 95% purity may be produced from safflower\\u000a fatty acids containing about 75% linoleic acid, by a liquid-liquid extraction process. Furfural was employed as the selective\\u000a solvent, hexane as a secondary solvent, and the fractionation was made in a Podbielniak “double-pup” centrifugal extractor.\\u000a Best results were obtained when

R. E. Beal; O. L. Brekke

1959-01-01

498

Study of liquid–liquid demixing from drug solution  

Microsoft Academic Search

In pharmaceutical industry, a deep understanding of the phase diagram is required in design of crystallization processes. We have investigated the phase diagram of a pharmaceutical compound (C35H41Cl2N3O2) in a mixture of ethanol\\/water. This phase diagram exhibits a solid–solid (polymorphism) and a liquid–liquid-phase separation (LLPS) as a function of temperature and drug substance concentration. This study focuses on the LLPS

Laurent Lafferrère; Christian Hoff; Stéphane Veesler

2004-01-01

499

Highly deformable liquid-state heterojunction sensors.  

PubMed

Mechanically deformable devices and sensors enable conformal coverage of electronic systems on curved and soft surfaces. Sensors utilizing liquids confined in soft templates as the sensing component present the ideal platform for such applications, as liquids are inherently more deformable than solids. However, to date, liquid-based devices have been limited to metal lines based on a single-liquid component given the difficulty in the fabrication of liquid-based junctions due to intermixing. Here, we demonstrate a robust platform for the fabrication of liquid-liquid 'heterojunction' devices, presenting an important advancement towards the realization of liquid-state electronic systems. The device architecture and fabrication scheme we present are generic for different sensing liquids, enabling demonstration of sensors responsive to different stimuli. As a proof of concept, we demonstrate temperature, humidity and oxygen sensors by using different ionic liquids, exhibiting high sensitivity with excellent mechanical deformability arising from the inherent property of the liquid phase. PMID:25262698

Ota, Hiroki; Chen, Kevin; Lin, Yongjing; Kiriya, Daisuke; Shiraki, Hiroshi; Yu, Zhibin; Ha, Tae-Jun; Javey, Ali

2014-01-01

500

Hydrophobic ionic liquids  

DOEpatents

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 of from 2 to 4 carbon atoms forming a ring structure converging on N; or separate phenyl groups; and wherein the alkyl groups, alkylene radicals or phenyl groups may be substituted with electron withdrawing groups, preferably F--, Cl--, CF.sub.3 --, SF.sub.5 --, CF.sub.3 S--, (CF.sub.3).sub.2 CHS-- or (CF.sub.3).sub.3 CS--; and X.sup.- is a non-Lewis acid-containing polyatomic anion having a van der Waals volume exceeding 100 .ANG..sup.3.

Koch, Victor R. (Lincoln, MA); Nanjundiah, Chenniah (Lynn, MA); Carlin, Richard T. (Nashua, NH)

1998-01-01