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  • 1
    Electronic Resource
    Electronic Resource
    Accurate nonadiabatic couplings for H3: Application to predissociation (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 5873-5881 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the results of an ab initio calculation, using analytic techniques, of nonadiabatic couplings for H3 between the degenerate 2E′ ground state and the 2s(2A1′), 3s(2A1′) and 3p(2E′) Rydberg states. The calculations employed extensive correlated wave functions that accurately reproduced the energy levels of these states. We have used these couplings as input to a two-dimensional wave packet calculation of dissociation dynamics in order to predict the predissociation lifetimes and final state vibrational distributions produced by the predissociation. A significant isotope effect is found in the final vibrational distributions produced from H3 and D3 predissociation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479882
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  • 2
    Electronic Resource
    Electronic Resource
    Uptake of phenoxyacetic acid by Penicillium chrysogenum (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 945-950 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  The uptake of phenoxyacetic acid by two different strains of Penicillium chrysogenum was studied. Phenoxyacetic acid (POA) was taken up by P. chrysogenum in a defined medium. Plots of initial velocity of POA uptake versus external substrate concentration, in the range 2–5000 μM, gave linear plots. Uptake of POA by induced and uninduced cells was identical. The initial velocity of POA uptake decreased as the pH of the suspension was increased from 5.4 to 7.2; the decrease closely paralleled the decline in the non-ionic form of the acid over this pH range. The initial velocity of POA uptake was not affected by the presence of phenylacetic acid. POA uptake proceeded until the cellular concentration was equal to the external concentration. It is concluded that POA is passively transported into P. chrysogenum by unmediated diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050356
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  • 3
    Electronic Resource
    Electronic Resource
    Uptake of phenoxyacetic acid by Penicillium chrysogenum (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 945-950 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The uptake of phenoxyacetic acid by two different strains of Penicillium chrysogenum was studied. Phenoxyacetic acid (POA) was taken up by P. chrysogenum in a defined medium. Plots of initial velocity of POA uptake versus external substrate concentration, in the range 2–5000 μM, gave linear plots. Uptake of POA by induced and uninduced cells was identical. The initial velocity of POA uptake decreased as the pH of the suspension was increased from 5.4 to 7.2; the decrease closely paralleled the decline in the non-ionic form of the acid over this pH range. The initial velocity of POA uptake was not affected by the presence of phenylacetic acid. POA uptake proceeded until the cellular concentration was equal to the external concentration. It is concluded that POA is passively transported into P. chrysogenum by unmediated diffusion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00191195
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  • 4
    Electronic Resource
    Electronic Resource
    Laparoscopic intracorporeal anastomosis in the colon using the biofragmentable anastomotic ring – an animal study (1996)
    Springer
    International journal of colorectal disease 11 (1996), S. 299-302 
    Details
    ISSN: 1432-1262
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé. Cette étude expérimentale a pour but de déterminer l'utilité d'une technique d'anastomose totalement laparoscopique du côlon avec l'aide de l'anneau d'anastomose biofragmentable Valtrac et avec l'emploi d'un nouvel applicateur. Après résection colique intra-corporelle fermée avec l'agrafeuse linéaire et après mise en place de bourses, l'extrémité proximale et distale du còlon est ré-ouverte pour permettre la mise en place de l'anneau de Valtrac permettrant de compléter l'anastomose intra-corporelle. Cette technique a été testée chez 8 cochons. Six animaux n'ont développé aucune complication per- ou postopératoire alors que deux cochons ont développé une péritonite fatale suite à une insuffisance de l'anastomose chez l'un des animaux et une sténose anastomotique par déplacement de l'anneau de Valtrac. Les résultats de cette étude montrent que la manipulation de l'anneau anastomotique biofragmentable est facilitée par l'usage du nouvel applicateur. Dans les cas non compliqués, l'endoscopie et l'histologie ont montré une guérison per primam avec peu de sclérose et aucune de sténose anastomotique.
    Notes: Abstract. This experimental study examines the usefulness of a totally laparoscopic anastomotic technique in the colon with the aid of the biofragmentable anastomotic Valtrac ring and a newly developed applicator device. Following closed intracorporeal colonic resection with the linear stapler and subsequent re-opening of the proximal and distal bowel ends after placement of a pursestring suture, intracorporeal anastomosis was completed with the Valtrac ring. The technique was tested in 8 pigs. 6 pigs had no intra- or postoperative complications, while 2 pigs developed fatal peritonitis following anastomotic insufficiency in one pig and anastomotic stenosis caused by tilting of the Valtrac ring in the other animal. The results of the study show that handling of the biofragmentable anastomotic ring is facilitated by the use of the new application system. In the uncomplicated case, endoscopy and histology revealed bland healing with little scarring, and no evidence of an anastomotic stenosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003840050066
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  • 5
    Electronic Resource
    Electronic Resource
    High Spin Structure in 123Xe (1998)
    Springer
    The European physical journal 2 (1998), S. 21-23 
    Details
    ISSN: 1434-601X
    Keywords: PACS:21.10.Re Collective levels – 27.60+j 90 ≤ A ≤ 149
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Excited states of the nucleus ν123Xe have been investigated with the fusion–evaporation-reaction ν110Pd(ν18O,5n)ν123Xe at 86 MeV beam energy, using the compton-suppressed Nordball-multidetector-system at the Niels-Bohr-Institute in Risø, Denmark. The level scheme of ν123Xe was extended up to a level of tentative 53/2+ħ. Four excited bands of 3-quasiparticle-character were observed. Analyzing the directional correlation information, we could assign spin- and parity-values to all observed bands in ν123Xe. The observed band structures fit well into systematics of the neighboring nuclei ν125Xe and ν127Xe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050086
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  • 6
    Electronic Resource
    Electronic Resource
    Isospin mixing in the 4 + doublet of 54 Co (2003)
    Springer
    The European physical journal 20 (2003), S. 129-130 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The T = 1 admixture into the T = 0 member of a recently discovered $J^\pi = 4^{ + }$ isospin-doublet in 54Co is obtained from the measured electromagnetic E2/M1 multipole mixing ratio, $\delta = 0.12(4)$ of the $T = 0, 4^{ + } \rightarrow T = 0, 3^{ + }$ transition. Combining these data with shell model calculations for strong isovector M1 and isoscalar E2 electromagnetic matrix elements one obtains a value for the T = 1 admixture into the T = 0, 4 + state of $0.23_{-0.10}^{ + 0.29}\%$ . The corresponding mixing matrix element in the 4 + doublet is $V_{\rm mix} = 10$ keV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epja/i2002-10337-8
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  • 7
    Electronic Resource
    Electronic Resource
    Negative electrodes in rechargeable lithium ion batteries — Influence of graphite surface modification on the formation of the solid electrolyte interphase (2000)
    Springer
    Ionics 6 (2000), S. 172-179 
    Details
    ISSN: 1862-0760
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Rechargeable lithium ion cells operate at voltages of ∼4.5 V, which is far beyond the thermodynamic stability window of the battery electrolyte. Strong electrolyte reduction and corrosion of the negative electrode has to be anticipated, which leads to irreversible loss of electroactive material and electrolyte, and thus strongly deteriorates cell performance. To minimize these reactions, negative electrode and electrolyte components have to be combined bringing about the electrolyte reduction products to form an effectively protecting film at the anode/electrolyte interface. This film hinders further electrolyte decomposition reactions and acts as membrane for the lithium cations, i.e., behaves as asolidelectrolytei2nt erphase (SEI). The present paper gives a review of our recent work in the field of negative electrodes in lithium ion batteries. The effects of the graphite anode surface and graphite anode surface modification on the formation of the SEI are discussed in detail by using the example: modification with carbon dioxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374063
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  • 8
    Electronic Resource
    Electronic Resource
    Design of an electrical impedance tomography phantom using active elements (2000)
    Springer
    Medical & biological engineering & computing 38 (2000), S. 390-394 
    Details
    ISSN: 1741-0444
    Keywords: Electrical impedance tomography (EIT) ; Electrical phantom ; Impedance spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The architecture of a novel phantom for electrical impedance tomography (EIT) is proposed. The design employs active elements, which include multiplying digital to analogue converters (MDAC), so that the impedance distribution in the phantom may be varied dynamically using computer control. The phantom is designed to assist in the validation of an EIT system under test. A number of published layouts for passive phantoms are analysed, and the requirements for an active element are specified for the most applicable of these. The use of active elements throughout a phantom imposes significant costs because of the need for each active element to operate independently. This proposal limits the cost and complexity by employing active elements in a restricted region of the phantom. Currently available technology, principally due to the limited analogue bandwidth of the MDAC, precludes the construction of a fully capable phantom from active elements. However, a design is specified that would enable its future development to cover the frequency range from 10kHz to 1 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02345007
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of a digitally controlled impedance element (2000)
    Springer
    Medical & biological engineering & computing 38 (2000), S. 395-400 
    Details
    ISSN: 1741-0444
    Keywords: Electrical impedance tomography (EIT) ; Synthesised impedance ; Multiplying DAC ; Impedance spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract A practical design for the synthesis of a digitally controlled electrical impedance element is presented. The impedance element comprises a real impedance element in series with a voltage source whose magnitude is determined by the applied voltage multiplied by a factor k. The value of k is shown strongly to affect the circuit's performance. Results are presented which demonstrate the correspondence between circuit models and practical measurements. When negative values for k were employed the circuit element offered a controlled impedance range of 1:1000 and was stable to at least 1.5MHz, providing that low source impedance values were used. With a positive k, a restricted range of impedance values could be obtained and the value of source impedance was less critical, though the circuit's performance was acceptable only to about 100 kHz. Consideration is given to the specification of a multiplier that would permit the circuit's range of application to be extended to low megahertz frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02345008
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