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• 2000-2004  (28)
• 1980-1984  (4)
• 1970-1974  (2)
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• 1
Electronic Resource
Springer
ISSN: 1741-0444
Keywords: Coregistration ; Visualisation ; Fusion ; PET
Source: Springer Online Journal Archives 1860-2000
Topics: Biology , Chemistry and Pharmacology , Medicine
Notes: Abstract As an aid to the interpretation of functional images, cross-modality coregistration of functional and anatomical images has grown rapidly. Various ways of easily interpreting and visualising coregistered images have previously been investigated; for their display, an intensity-weighted temporally alternating method is used. For brain images, geometric registration involves the automatic alignment method, using the head scalp boundary extracted from the sinogram of a PET emission scan and a surface-matching algorithm; images of the chest or abdomen are registered semi-automatically using a paired point matching algorithm. For the simultaneous display of geometrically registered images, rapid image switching is applied; both images are written with independent colour scales. The rapidly alternating display of two images, synchronised with monitor scanning, induces the fusion of images in the human visual perception system. The accuracy of registration of PET and MRI images is within 2 mm for two point sets. A resulting image is intensified by weighting the display time and/or controlling the intensity map of each image with the degree of interest. This method may be useful for the interpretation and visualisation of coregistered images.
Type of Medium: Electronic Resource
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• 2
Electronic Resource
Springer
Bioprocess engineering 23 (2000), S. 11-16
ISSN: 0178-515X
Source: Springer Online Journal Archives 1860-2000
Topics: Process Engineering, Biotechnology, Nutrition Technology
Notes: Abstract  A new bacterium producing a novel transfructosylating enzyme was isolated from soil and designated as Bacillus macerans EG-6. Various culture conditions for enzyme production were optimized in a flask culture. 1% (w/v) sucrose as a carbon source and a mixed nitrogen source (1% yeast extract, 1% polypeptone, and 0.5% ammonium chloride) gave the best enzyme production. Addition of phosphate and magnesium ion into the medium enhanced the enzyme yield. Optimum culture pH and temperature were 7.0 and 37 °C, respectively. Under optimal culture conditions, transfructosylating enzyme was rapidly produced in the early growth period, thereafter invertase activity was predominant as the culture proceeded. Using the culture filtrate, production of fructooligosaccharides from sucrose was preliminarily carried out. In a low sucrose concentration (200 g/l), transfructosylating activity competes with invertase activity in sucrose utilization. Subsequently, low fructooligosaccharide yield (20%) was achieved due to liberation of high amounts of glucose and fructose. The best oligosaccharide yield (43%) was achieved when 500 g/l sucrose was utilized.
Type of Medium: Electronic Resource
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• 3
Electronic Resource
Springer
Commentarii mathematici Helvetici 75 (2000), S. 410-414
ISSN: 1420-8946
Source: Springer Online Journal Archives 1860-2000
Topics: Mathematics
Notes: Abstract. In this paper, we will prove there are infinitely many integers n such that n 2— 1 is square-free and $\Bbb Q(\sqrt {n^2-1})$ admits universal octonary diagonal quadratic forms.
Type of Medium: Electronic Resource
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• 4
Electronic Resource
Springer
The European physical journal 38 (2004), S. 349-357
ISSN: 1434-6052
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract. The Higgs sector of the minimal nonlinear supersymmetric SU(5) model contains three mass parameters. Although these mass parameters are essentially free at the electroweak scale, they might have particular values if they evolve from a particular constraint at the GUT scale through the RG equations. By assuming a number of simple constraints on these mass parameters at the GUT scale, we obtain their values at the electroweak scale through the RG equations in order to investigate the phenomenological implications. Some of them are found to be consistent with the present experimental data.
Type of Medium: Electronic Resource
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• 5
Electronic Resource
Springer
The European physical journal 20 (1983), S. 53-55
ISSN: 1434-6052
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract Characteristic features of the scattering of light pseudoscalar and scalar particles are pointed out. We discuss how a light pseudoscalar particle might experimentally be distinguished from a light scalar particle. Further we give a method for determining the mass of the light pseudoscalar particle.
Type of Medium: Electronic Resource
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• 6
Electronic Resource
Springer
Colloid & polymer science 278 (2000), S. 591-594
ISSN: 1435-1536
Keywords: Key words Nucleated particle formation ; Urethane acrylate ; Turbidity measurement ; Boundary concentration ; Stage of particle growth
Source: Springer Online Journal Archives 1860-2000
Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes: Abstract  The procedure of nucleated particle formation and particle growth in dispersion polymerization was studied with the intention of understanding the production of monodisperse polystyrene particles cross-linked with urethane acrylate (UA). The time required for the formation of primary particles was determined exactly from the turbidity measurement of the reaction mixture with the polymerization time. It could be found that differing from conventional divinyl cross-linkers, such as divinylbenzene, UA had a boundary concentration where the association and coagulation of preformed nuclei with other oligomers and/or nuclei effectively took place until the primary particle formed. Similarly to linear polystyrene particles, the particle number density of the primary particles cross-linked with UA remained constant to the final particles. This observation verifies the suggestion that the primary particles cross-linked with UA readily absorbed the monomers from the medium during the stage of particle growth.
Type of Medium: Electronic Resource
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• 7
Electronic Resource
New York : Wiley-Blackwell
ISSN: 0360-6384
Keywords: Chemistry ; Polymer and Materials Science
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology
Type of Medium: Electronic Resource
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• 8
Electronic Resource
Hoboken, NJ : Wiley-Blackwell
AIChE Journal 30 (1984), S. 21-29
ISSN: 0001-1541
Keywords: Chemistry ; Chemical Engineering
Source: Wiley InterScience Backfile Collection 1832-2000
Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
Notes: A heterogeneous model is developed to account for noncatalytic gas-solid reactions in a vertical pneumatic transport reactor. The model takes into consideration both the positive and negative variations of the solid porosity and the variation of the gas diffusivity with the reaction. The method of lines utilizing the second order centered finite difference scheme for the spatial discretization is employed to obtain the model solution.Experiments utilizing a vertical pneumatic transport reactor of a laboratory scale are performed to study the reaction between limestone and sulfur dioxide generated from coal combustion. The reactor is of 16.2 cm ID and 610 cm in length. The experimental data for sulfur retention are reported for various superficial gas velocities and calcium-sulfur molar ratios. Verification of the model with experimental data is conducted. The agreement between the model prediction and experimental data is satisfactory.
Type of Medium: Electronic Resource
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• 9
Electronic Resource
[s.l.] : Nature Publishing Group
Nature 416 (2002), S. 518-521
ISSN: 1476-4687
Source: Nature Archives 1869 - 2009
Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
Notes: [Auszug] Transition-metal perovskite oxides exhibit a wide range of extraordinary but imperfectly understood phenomena. The best known examples are high-temperature superconductivity in copper oxides, and colossal magnetoresistance in manganese oxides ...
Type of Medium: Electronic Resource
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• 10
Electronic Resource
[s.l.] : Macmillian Magazines Ltd.
Nature 413 (2001), S. 288-291
ISSN: 1476-4687
Source: Nature Archives 1869 - 2009
Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
Notes: [Auszug] High-strain-rate superplasticity describes the ability of a material to sustain large plastic deformation in tension at high strain rates of the order of 10-2 to 10-1 s-1 and is of great technological interest for the shape-forming of ...
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