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  • 1
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    Effect of fulvic acid and ionic strength on the sorption of radiostrontium on Chinese calcareous soil and its solid components (2006)
    Springer
    Details
    Publication Date: 2006-04-01
    Print ISSN: 0236-5731
    Electronic ISSN: 1588-2780
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    The superconducting proximity effect as a tool to investigate metal films and interfaces (2004)
    Springer
    The European physical journal 39 (2004), S. 199-205 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. The superconducting proximity effect is measured in sandwiches of thin Pb films and the alkali metals Cs, Rb, K and Na. The T c -dependence provides information about the interface barriers between Pb and the alkalis. Such a barrier is particularly large in Pb/Cs sandwiches. It is not due to impurities or oxydation. In the presence of a sufficiently strong barrier a special form of the Cooper limit can be applied to calculate the transition temperature of the sandwich.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00182-1
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  • 3
    Electronic Resource
    Electronic Resource
    Full wave electromagnetic simulation of electrooptic high-speed probes (1996)
    Springer
    Optical and quantum electronics 28 (1996), S. 765-782 
    Details
    ISSN: 1572-817X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract This paper outlines the process of modelling external electrooptic probes mounted on coplanar waveguides (CPW). The techniques used to describe the electromagnetic properties of the external probes are the finite difference time domain (FDTD) method and the finite difference transmission line method (FDTLM). These full wave techniques are time domain in nature that must be Fourier transformed to describe important frequency domain characteristics such as scattering parameters. The optical retardation of the probe is related to the full wave analysis through a commonly used grid size that results in a generalized basis for a complete electrooptic system analysis including a unique definition of an electrooptic transfer function,H(ω). Following the field simulation, the properties of the probe (invasiveness, retardation, signal distortion and group delay) are presented. Procedures for optimizing models for probe tips are discussed and related to a first-order model that has been developed. The results indicate that these probes can be simulated successfully on moderately sized Unix work stations and that the optimization of probe models must include the full wave simulation in the definition of the necessary gradients for the optimization process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00820148
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  • 4
    Electronic Resource
    Electronic Resource
    Location of ecdysteroid 22-O-acyltransferase in the larvae ofHeliothis virescens (1994)
    Springer
    Entomologia experimentalis et applicata 70 (1994), S. 263-272 
    Details
    ISSN: 1570-7458
    Keywords: tobacco budworm ; Heliothis virescens ; Noctuidae ; epithelial cell ; brush border membrane ; ecdysteroids ; metabolism ; acyltransferase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Larvae of the tobacco budworm,Heliothis virescens, are resistant to high levels of ingested 20-hydroxyecdysone which could cause potential inhibition to the development of many other lepidopteran species. This resistance is attributed to the ability of the larvae to metabolize this molting hormone to its 22-acyl ester forms. When tobacco budworm larvae were fed large quantities of 20-hydroxyecdyone, the hormonal metabolites were found in gut and fat body tissues. When incubated with 20-hydroxyecdysone gut tissue converted 20-hydroxyecdysone into its 22-acyl ester metabolites. Lumen site of the midgut was found to be the major location of this bio-transformation. In contrast, fat body tissue failed to convert 20-hydroxyecdysone to 22-acyl ester metabolitesin vitro. After the oral injection of3H-ecdysone, the major metabolites formed were ecdysone 22-acyl esters whereas the majority of3H-ecdysone was transformed to polar metabolites after it was injected into the hemocoel of the larvae. Similar distributions of ecdysteroid 22-O-acyltransferase and alkaline phosphatase activity in subcellular fractions demonstrates the co-localization of these enzymes in plasma membrane of the gut epithelial cells. These results suggest that gut brush border membrane is the major site of ecdysteroid 22-acyl ester formation inH. virescens larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02380560
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of fluorination of alumina support on activity of platinum catalysts for complete oxidation of benzene (1997)
    Springer
    Catalysis letters 49 (1997), S. 155-161 
    Details
    ISSN: 1572-879X
    Keywords: fluorination ; alumina ; platinum catalysts ; oxidation ; oxidation of benzene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Platinum supported on fluorinated alumina is more active for the total oxidation of benzene than is the catalyst with the same Pt loading supported on hydrophilic unfluorinated alumina. The Pt-F/alumina catalyst contains well-dispersed small Pt particles, in contrast to Pt/alumina. The high dispersion is a consequence of a strong metal-support interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019065507551
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of an organic polymer in purification and cutting of single-wall carbon nanotubes (2000)
    Springer
    Applied physics 71 (2000), S. 449-451 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.05.Lg; 81.05.Tp; 81.05.Ys; 81.20.Ym
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. A mixture of as-grown single-wall carbon nanotubes (SWNTs) and a monochlorobenzene (MCB) solution of polymethylmethacrylate (PMMA) was sonicated and homogenized. As a result, SWNTs were separated from carbonaceous impurities and metal particles, which enabled us to purify the SWNTs by filtration. We also found that the number of short (about 1-μm) SWNTs and thin bundles of SWNTs increased. The thin bundles contained one to three SWNTs. These short, thin SWNTs suspended in the MCB solution of PMMA were spin-coated onto a Si wafer, and could be dispersed on it.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000688
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of interdiffusion coefficients of liquid zinc and tin under convectionless conditions (2000)
    Springer
    Applied physics 70 (2000), S. 219-222 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 66.10.C; 47.20.B; 68.35.Md
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. In this paper we present a new method for measuring diffusion coefficients in liquid metals under convectionless conditions with solid/liquid–liquid/solid trilayers. The advantage of this kind of trilayer is that effects from gravity-induced convection and Marangoni convection can be omitted, so that the diffusion coefficient is determined more accurately. The Ta/Zn-Sn/Si trilayers were prepared with a multi-target ion-beam sputtering deposition technique and annealed in an electric furnace under an argon atmosphere. The interdiffusion of liquid zinc and tin at 500 °C was investigated. The diffusion concentration profiles were determined by energy dispersive spectroscopy. The interdiffusion coefficients range from 1.0×10-6 cm2/s to 2.8×10-6 cm2/s, which is less than previous values measured by capillary reservoir technique under 1–g environment where various convections exist. The precise interdiffusion coefficients of liquid zinc and tin result from the removing of disturbances of various kinds of convection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050036
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  • 8
    Electronic Resource
    Electronic Resource
    Differences in Bone Resorption after Menopause in Japanese Women with Normal or Low Bone Mineral Density: Quantitation of Urinary Cross-Linked N-Telopeptides (1998)
    Springer
    Calcified tissue international 62 (1998), S. 395-399 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Type I-N-telopeptides — Bone resorption — Bone mineral density — Menopause — Osteoporosis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. The objective of this study was to examine the value of NTx, a urinary cross-linked N-telopeptides of type I collagen, as a marker of bone resorption. We assessed changes in pre- and postmenopausal bone resorption by evaluating the correlation of NTx with L2–4 bone mineral density (BMD) in a total of 1100 Japanese women, aged 19–80 years [272 premenopausal (45.2 ± 6.2 years) and 828 postmenopausal (59.5 ± 6.2 years)]. Postmenopausal women were divided into three groups based on the range of BMD (normal, osteopenic, and osteoporotic). Within each group, subjects were further segregated according to years since menopause (YSM). NTx values were then evaluated for each group. Our results showed that BMD was significantly decreased (P 〈 0.05) and NTx was significantly increased (P 〈 0.01) after menopause in age-matched analysis. Consistent with a previous report, NTx was inversely correlated with BMD for the entire cohort of study subjects (r =−0.299), although NTx correlated better with premenopausal than postmenopausal BMD (r =−0.240 versus r =−0.086). This may have been due to the fact that elevated values of NTx were exhibited over the entire range of BMD present in the postmenopausal women, suggesting that NTx might respond faster to the estrogen withdrawal than BMD. In all postmenopausal women, regardless of the range of BMD, the increase in NTx reached a peak within 5 YSM. After 11 YSM, however, NTx remained elevated in the osteoporotic group but it decreased in the osteopenic group, and showed no significant change in the group of postmenopausal women with normal BMD. These findings suggest that bone resorption is dramatically increased within 5 years after menopause but remains increased only in osteoporotic women.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900451
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  • 9
    Electronic Resource
    Electronic Resource
    Different spatial structures between network regions and active regions indicated by TRACE 171 Å observation (1999)
    Springer
    Solar physics 190 (1999), S. 79-90 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By comparing TRACE 171 Å observations with photospheric magnetograms, we find that the root of TRACE 171 Å emission is centered in magnetic elements in simultaneous Huairou photospheric magnetogram and the luminosity of TRACE 171 Å emission is not always in proportion to the strength of the corresponding photospheric magnetic field. While TRACE emission from an active region shows an obvious upward extension as a whole, fibril-like emissions from network elements show little extension along the structure from the root of each emission to 40′′ higher up in the solar atmosphere. Together with previous studies by Zhang and Zhang (1999, 2000), it is suggested that the magnetic fields in active regions and quiet-Sun regions present different spatial structures from the solar photosphere to the chromosphere and maybe even in the corona.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005276217089
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  • 10
    Electronic Resource
    Electronic Resource
    Power law decay of correlations in stationary nonequilibrium lattice gases with conservative dynamics (1988)
    Springer
    Journal of statistical physics 52 (1988), S. 1461-1478 
    Details
    ISSN: 1572-9613
    Keywords: Nonequilibrium stationary states ; stochastic lattice gas ; high-temperature approximations ; pair correlations ; power law decay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report computer simulations and high-temperature approximations of the pair correlation in a stationary nonequilibrium system, a lattice gas subject to a strong uniform driving fieldE. The dynamics of the system is given by hoppings of particles to adjacent empty sites with rates biased for jumps in the direction ofE. We study the anisotropic short-distance behavior as well as the long-distance decay properties of the two-point correlations along the principal axes. The simulations as well as the (approximate) expansion inβ strongly suggest that the correlations in this system have a power law decay,r −D for dimensionsD=2 and 3, even at high temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01011660
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