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  • 1
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    Magnetic minerals and magnetic properties of the Siwalik Group sediments of the Karnali river section in Nepal (2000)
    Springer
    Details
    Publication Date: 2000-05-01
    Print ISSN: 1343-8832
    Electronic ISSN: 1880-5981
    Topics: Geosciences , Physics
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structure of 4-(p-methoxyphenyl)-3, 5-bis(4-pyridyl)-1,2,4-triazole (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 429-432 
    Details
    ISSN: 1572-8854
    Keywords: Triazole ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The 4-(p-methoxyphenyl)-3,5-bis(4-pyridyl)-1,2,4-triazole has been synthesized and its crystal structure has been determined by X-ray diffraction methods. It crystallizes in the monoclinic space group P21/n, with a = 12.5832(6) Å, b = 7.0512(5) Å, c = 18.4669(12) Å, β = 96.826(1)°, and Dcalc = 1.345 g cm−1 for Z = 4. In the structure, two pyridyl rings, phenyl ring, and triazole ring do not share a common plane. The most favored orientation of the pyridyl rings in the crystal is that their planes are inclined toward opposite directions with respect to the triazole ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009542208264
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  • 3
    Electronic Resource
    Electronic Resource
    Tilted Bianchi Type I Models with Heat Conduction Filled with Disordered Radiations of Perfect Fluid in General Relativity (2000)
    Springer
    Astrophysics and space science 271 (2000), S. 227-235 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, we have investigated some tilted Bianchi Type I models with heat conduction filled with disordered radiation of perfect fluid. To get a determinate solution, we have assumed a condition A =(BC) n between metric potentials. Alternatively we have discussed the case A=(BC) 1/3 for which tilted nature of the model is preserved. The various and geometrical features with singularities in the models are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002474122763
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  • 4
    Electronic Resource
    Electronic Resource
    Syntheses, crystal structures and spectroscopic properties of the novel complexes [M(MOBPT)*2 (H2O)2](ClO4)2 · 4H2O (M = CoII and NiII) (2000)
    Springer
    Transition metal chemistry 25 (2000), S. 589-593 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The novel cobalt(II) and nickel(II) complexes with 4-(p-methoxyphenyl)-3,5-bis(pyridin-2-yl)-1,2,4-triazole (MOBPT) have been synthesized and their molecular structures determined by X-ray analysis, i.r. and by ESI-MS spectroscopy. The metal atom is in a distorted octahedral environment. Two bidentate chelating ligands (MOBPT) coordinate to the metal center equatorially and two water molecules coordinate axially. Each MOBPT entity coordinates via one triazole nitrogen and one pyridine nitrogen atom. Magnetic measurements show that the complexes are high-spin species in the 75–300 K range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007037326099
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  • 5
    Electronic Resource
    Electronic Resource
    An assessment of pressure drop and void fraction correlations with data from two-phase natural circulation loops (2000)
    Springer
    Heat and mass transfer 36 (2000), S. 541-548 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract  Void fraction and pressure drop correlations play an important role in predicting the performance of natural circulation loops. Hence an assessment of the commonly used and often cited correlations for pressure drop and void fraction has been carried out with data from natural circulation loops. This assessment considered 33 void fraction correlations and 14 pressure drop correlations. The void fraction correlations were initially tested against the various limiting conditions. Only 14 correlations were found to satisfy at least two limiting conditions (i.e., at x = 0; α = 0 and at x = 1; α = 1) and were assessed against the data. This assessment showed that the Chexal et al. (1996) correlation is better than all the others considered. The assessment of pressure drop correlations were carried out with the Chexal et al. (1996) correlation for void fraction and Saha-Zuber model for the onset of subcooled boiling. This assessment showed that most correlations give predictions close to each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310000108
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  • 6
    Electronic Resource
    Electronic Resource
    Nitrogen Management in No-Tillage Grain Sorghum Production (2000)
    Springer
    Semigroup forum 92 (2000), S. 321-328 
    Details
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Sorghum bicolor (L.) Moench] is grown in rotation with wheat (Triticum aestivum L.) and soybean [Glycine max (L.) Merr.] in the mid-Atlantic. Sufficient data on N fertilization of sorghum are not available for this region. Our objective was to evaluate the influence of multi-rate N fertilization on dryland sorghum. Treatments consisted of factorial combinations of four starter-band N rates (11, 34, 56, and 78 kg N ha−1) and four sidedress N rates (0, 45, 90, and 134 kg N ha−1). A broadcast treatment of 67 kg N ha−1 at planting was also included. Starter-band was applied 5 cm to the side and below the seed. Sidedress was applied 35 days after emergence at the eight-leaf growth stage. Grain yield ranged from 1.7 to 11.9 Mg ha−1 over eight site-years and was responsive and nonresponsive to N applications on four sites each. Nonresponsiveness was either due to high levels (〉85 kg N ha−1) of residual soil mineral N, or severe water stress conditions. Our results indicate that production of sorghum on soils testing high in mineral N (50 kg N ha−1 in the surface 0.3 m) at planting should not receive any starter-band N in conjunction with sidedress N application of 130 kg N ha−1 for optimum economic return to N fertilization. For soils testing low in mineral N, 40 kg N ha−1 starter-band in conjunction with 130 kg N ha−1 sidedress N should optimize the sorghum yields in most situations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 7
    Electronic Resource
    Electronic Resource
    Attenuation of changes in sarcoplasmic reticular gene expression in cardiac hypertrophy by propranolol and verapamil (2000)
    Springer
    Molecular and cellular biochemistry 213 (2000), S. 111-118 
    Details
    ISSN: 1573-4919
    Keywords: pressure overload ; gene expression ; subcellular remodeling ; sarcoplasmic reticulum Ca2+-handling ; anti-hypertensive therapy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The effects of propranolol and verapamil on contractile dysfunction, subcellular remodeling and changes in gene expression in cardiac hypertrophy due to pressure overload were examined. Rats were subjected to banding of the abdominal aorta and then treated with either propranolol (10 mg/kg daily), verapamil (5 mg/kg daily) or vehicle for 8 weeks after the surgery. Depression of the left ventricular function in the hypertrophied heart was associated with decreases in myofibrillar and myosin CA2+ ATPase activities as well as Ca2+-pump and Ca2+-release activities of the sarcoplasmic reticulum (SR). The level of a-myosin heavy chain (α-MHC) mRNA was decreased while that of β-MHC mRNA was increased in the pressure-overloaded heart. The level of SR Ca2+-pump ATPase (SERCA2) mRNA and protein content for SERCA2 were decreased in the pressure overloaded heart. Treatment of the hypertrophied animals with propranolol or verapamil resulted in preservation of the left ventricular function and prevention of the subcellular alterations. Shift in the α- and β-MHC mRNA levels and changes in the expression in SERCA2 mRNA level and protein content were also attenuated by these treatments. The results suggest that blockade of β-adrenoceptors or voltage-dependent calcium channels normalizes the cardiac gene expression, prevents subcellular remodeling and thus attenuates heart dysfunction in rats with cardiac hypertrophy. Furthermore, both cardiac β-adrenoceptors and L-type Ca2+-channels may be involved in the genesis of cardiac hypertrophy due to pressure overload.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007120332587
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  • 8
    Electronic Resource
    Electronic Resource
    Crack formation in sapphire/niobium/sapphire joints under compression (2000)
    Springer
    Journal of materials science 35 (2000), S. 1087-1096 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Compression tests were carried out on UHV diffusion bonded single crystalline sapphire/Nb/sapphire joints to investigate their mechanical properties, the mechanisms that lead to the failure of the joints and the dislocation-interface interaction. The tests were performed for different orientation relationships (OR) at the interface to study the influence of different bond strength on the mechanical behavior. Additionally, the metal layer thickness was varied for each OR to alter the influence of the interface. The experimental results showed, that with decreasing metal layer thickness the stress needed to form a crack increases drastically, whereas for the Nb/sapphire system the bond strength at the interface seems to have no significant influence on the mechanical behavior of the joint. A theoretical model will be presented that explains the experimentally observed relationship between metal layer thickness and crack stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004799312371
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  • 9
    Electronic Resource
    Electronic Resource
    Metal Schiff-Base Complex Catalyzed Oxidation of p-Xylene and Methyl 4-Methylbenzoate to Carboxylic Acids (2000)
    Springer
    Reaction kinetics and catalysis letters 71 (2000), S. 289-294 
    Details
    ISSN: 1588-2837
    Keywords: Oxidation ; p-xylene ; methyl 4-methylbenzoate ; p-toluic acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Oxidation of p-xylene and methyl 4-methylbenzoate were catalyzed by transition metal Schiff-base complexes having the general formula LMCl1–2 (where M = manganese or ruthenium and L = salen, salicylaldehydeethylenediimine, saloph, salicylaldehyde-o-phenylenediimine and EDTA, ethylenediaminetetraacetate) at 150°C and 500 psig air and gave p-toluic acid (〉 85 %) and monomethyl terephthalate (〉 70%) as the major oxidation products, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010375126176
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  • 10
    Electronic Resource
    Electronic Resource
    Spectral Studies on the Cyclodextrin Inclusion Complexes of Toluidine Blue O and Meldola's Blue in Aqueous Solution (2000)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 36 (2000), S. 9-20 
    Details
    ISSN: 1573-1111
    Keywords: Toluidine blue O ; Meldola's blue ; cyclodextrin ; inclusion complex
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The absorption and emission spectral properties of toluidine blue O (TBO) and Meldola's blue (MDB) in the presence of cyclodextrins (CDs) were studied. Formation of 1 : 1 and 1 : 2 (CD-Dye) inclusion complexes were observed with β-CD and γ-CD, respectively. An increase in the emission intensity was noticed in the presence of β-CD due to the formation of 1 : 1 (CD-Dye) inclusion complexes. However, a decrease in the emission intensity was observed in the presence of γ-CD due to the formation of 1 : 2 (CD-Dye) inclusion complexes. Dimerization of dye molecules in the presence of γ-CD lead to a decrease in the emission intensity. The formation constants for the 1 : 1 and 1 : 2 (CD-Dye) inclusion complexes were calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008085829227
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