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  • 1
    Electronic Resource
    Electronic Resource
    Fabrication of Lightweight SiC Space Mirror (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1151-1154 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Silicon carbide ceramic has many attributes including high strength and stiffness, low thermalexpansion coefficient, high thermal conductivity, low density and good resistant for radiation of spaceparticles. These attributes make SiC ceramic becoming the third generation space mirror material. Thispaper describes the fabrication of lightweight SiC mirror blanks. By reducing the shrinkage of green bodyand controlling the drying conditions, lightweight SiC mirror blank with a diameter of 612mm has beenprepared by using gelcasting process. The forming green body is infiltrated with liquid silicon at thetemperature of 1600°C, then a CVD SiC layer is coated on the surface of SiC mirror blank. After grindingand polishing, the mirror shows good optical properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1151.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Properties and Application of Oriented Porous SiC as Transpiration Cooling Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1109-1112 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper describes the fabrication of porous reaction-bonded SiC ceramics with radialdirected pores and the application of these materials to transpiration cooling system of rocket engines. Aspecial mold is designed for freeze-casting process to prepare SiC cylinders with radial directed pores.Green bodies with well-oriented pore structure are obtained from slurry with solid loading up to 47vol%.The pore size is in the level of several tens micron. Green bodies with various porosities are infiltratedwith different amount of liquid Si. The intrinsic permeability of each sample is measured with air asflowing media. It is concluded that permeability has relationship with not only the porosity but also thepore structure of samples
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1109.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical investigation of the stabilization of the no-motion state of a fluid layer heated from below and cooled from above (1998)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 10 (1998), S. 1597-1610 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The feasibility of controlling flow patterns of Rayleigh–Bénard convection in a fluid layer confined in a circular cylinder heated from below and cooled from above (the Rayleigh–Bénard problem) is investigated numerically. It is demonstrated that, through the use of feedback control, it is possible to stabilize the no-motion (conductive) state, thereby postponing the transition from a no-motion state to cellular convection. The control system utilizes multiple sensors and actuators. The actuators consist of individually controlled heaters positioned on the bottom surface of the cylinder. The sensors are installed at the fluid's midheight. The sensors monitor the deviation of the fluid's temperatures from preset desired values and direct the actuators to act in such a way so as to eliminate these deviations. The numerical predictions are critically compared with experimental observations. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869679
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of Oriented Porous Silicon Carbide Bodies by Freeze-Casting Process (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1287-1290 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Porous ceramics green bodies of silicon carbide were formed by freeze-casting of silicon carbide/carbon black aqueous slurries in a mold where temperature distribution was controlled. The influence of solid loading on the pore structure of green bodies was investigated. Pore morphology of green bodies formed from slurries with various solid loading ranging from 25 to 50vol% experienced agradual change. Appropriate solid loading of silicon carbide/carbon black slurry was concluded for fabrication of SiC ceramics with oriented pore structure. Two means were employed for changing ice crystallizing velocity, so that the influence of ice crystallizing velocity on pore size of green bodies was explored. It was concluded that pore size became larger under slow freezing condition, whereas smallerwith the pre-cooling of silicon carbide/carbon black slurry
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1287.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Gelcasting of Aqueous Silicon Carbide (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1291-1296 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper describes the investigation of gelcasting of silicon carbide/carbon black aqueous slurry. Aqueous slurries are prepared by using polyvinylpyrrolloidone and tetramethyl ammonium hydroxide as dispersants. Rheological behaviors of the slurries have been studied. Two initiator systems are used to initiate free-radical polymerization of acrylamide in silicon carbide/carbon black aqueous slurry. In order to reduce strong effect of carbon black on inhibiting polymerization of acrylamide,acetylacetone is added into the slurry. The experimental result shows that controllable free-radical polymerization of acrylamide in silicon carbide/carbon black aqueous slurry can be realized by adding small quantity of acetylacetone
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1291.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Oxidation Resistance of 2D C/SiC Composites Fabricated by FCVI (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1056-1058 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two-dimensional waved carbon fiber preforms were chemical vapor infiltrated under forcedflow, thermal gradient mode for preparation of 2D C/SiC composites. In order to improve the oxidationresistance of the C/SiC composites, B4C powders were added into the preforms and aqueous silicasol-B4C compound coating was claded on the surfaces of composites. It was found that the oxidationresistance of 2D C/SiC composites at temperatures lower than 1273K was improved because of theformation of B2O3 and borosilicate glass by preventing the diffusion of oxygen
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1056.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Preparation of RBSC Green Bodies by Gel-Casting (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 834-836 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, green bodies of RBSC were prepared through the gel-casting process. The effectsof monomer concentration and ratio of MBAM to AM on the strength and microstructure of the greenbodies were studied. When the monomer content increased from 10wt% to 20wt %( relative to water inthe slurry), the flexural strength increases efficiency. However, the flexural strength decreases when themonomer content was above 20wt%. Similarly, when the ratio of MBAM to AM increased from 1/19 to1/9, it had the same effects on the flexural strength of green bodies. It was found that silicon carbideparticles were packaged by the carbon particles with gel. When the monomer content was 20wt% and theratio of MBAM to AM was 1/9, the green body showed the best homogeneous microstructures and itsflexural strength achieved 8MPa
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.834.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Transpirational Performance of Oriented Porous SiC Transpiration Cooling Materials (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 837-839 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The application and the transpirational behavior of oriented porous SiC as transpiration coolingmaterials in a simulating test were studied. The test sample was shaped by freeze-casting process andreaction sintered. The testing device was composed by an electric arc combustor and a hydrogen coolantproviding system. It was found that the permeability, the amount of coolant required and the uniformity ofcoolant infiltration were all effected by the microstructure of porous SiC, which furthermore influced thecooling efficiency of the testing system. In this test, the inner face temperature of the combustion chamberwas maintained less than 400K throughout the thermal testing period contrasting with the fire temperatureup to 3600K by the utilization of oriented porous SiC transpiration cooling materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.837.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of 17α-ruthenocenyl-17β-oestradiol and its potential as a radiopharmaceutical agent (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 11 (1997), S. 771-781 
    Details
    ISSN: 0268-2605
    Keywords: bioorganometallic ; ruthenocene ; organometallic oestrogen ; radiopharmaceutical ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of 17α-ruthenocenyl-17β-oestradiol and results of biochemical tests to determine its suitability as a radiopharmaceutical agent, are reported. 17α-Ruthenocyl-17β-oestradiol was obtained, in an overall yield of 29%, by addition of ruthenocenyl-lithium (prepared by treatment of ruthenocene with t-butyl-lithium) to the ketone function of protected oestrone, followed by the deprotection of the 3-OH function. It was characterized by X-ray crystallography: space group P 21 (monoclinic), a=9.150(2) Å, b=11.806(4) Å, c=12.193(3) Å, β=94.56(2)°, V=1313(2) Å3, Z=2. The relative binding affinity (RBA) of this complex for the oestradiol-specific receptor was compared with that of oestradiol. 17α-Ruthenocyl-17β-oestradiol is still recognized by the oestradiol receptor with an RBA of 2%. Unlike its analogue, 17α-propynyl-Co2(CO)6-17β-oestradiol, it does not act as an affinity marker for the oestradiol receptor. This may be explained by the relative stability of the carbenium ion generated from it, which has a pKR+ value of +0.73. 17α-Ruthenocyl-17β-oestradiol is however of potential interest as a radiopharmaceutical agent since ruthenium has radioactive isotopes emitting β- and γ-radiation useful in nuclear medicine. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    The Halogenation of Some Benzamides Takes Place Preferentially at the ortho, para Positions (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 1689-1696 
    Details
    ISSN: 1434-193X
    Keywords: Aromatic substitution ; Benzamides ; Chlorination ; Bromination ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The orientation of chlorination and bromination of N, N-disubstituted benzamides in aqueous acetic acid is strongly influenced by the nature of the alkyl groups at the nitrogen atom. With large groups, the halogenation takes place fairly selectively at the ortho/para positions.
    Type of Medium: Electronic Resource
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