Ultrasonic Evaluation of Elastic Properties of Silica Aerogels. (9999)
The velocity and attenuation of ultrasonic waves were measured in silica aerogels as a function of frequency, density, gas pressure within the pores and elastic strain. The sound velocity was found...
High-power monolithic two-mode DFB laser diodes for the generation of THz radiation (2008)
Klehr, A., Fricke, J., Knauer, A., Erbert, G., Walther, M., Wilk, R., ...
We have devolved 1064 nm high-power monolithic distributed feedback lasers which operate simultaneously on two longitudinal modes. These modes correspond to the fundamental and first-order lateral...
AISENBREY, S, Lafaut, Bart, SZURMAN, P, GRISANTI, S, LUKE, C, KROTT, R, ...
Mihlbachler,K., Fricke,J., Yun,T., Seidel-Morgenstern,A., Schmidt-Traub,H., Guiochon,G.
Although it is impossible to manufacture identical columns for use in a simulated moving bed (SMB) process, theoretical studies assume that all the columns in a SMB unit have identical...
Mihlbachler, K., Fricke, J., Yun, T., Seidel-Morgenstern, A., Schmidt-Traub, H., Guiochon, G.
Although it is impossible to manufacture identical columns for use in a simulated moving bed (SMB) process, theoretical studies assume that all the columns in a SMB unit have identical...
Verfahren zur Herstellung poroeser Keramik der Zusammensetzung Pb(ZrxTi1-x)O3 (2000)
Loebmann, P., Glaubitt, W., Fricke, J.
Production of a porous ceramic composition. :Pb(ZrxTi1-x)-O3 (where x = 0 -0.9) comprises : (a) forming a 0.5 molecule solution containing polar solvents with complexing chelating properties, Pb(II)...
Manara, J., Brandt, R., Kuhn, J., Fricke, J., Krell, T., Schulz, U., ...
MOP: A space debris and interplanetary dust sample return mission. (1999)
Kaldeich-Schürmann, B., Scherer, K., Hilchenbach, M., Kirsch, E., Livi, S., Bendisch, J., ...
MOP: A space debris and interplanetary dust sample return mission. (1999)
Scherer, K., Hilchenbach, M., Kirsch, E., Livi, S., Bendisch, J., Blum, J., ...
Quantized aggregation phenomena in II-VI-semiconductor colloids (1998)
Ptatschek, V., Schmidt, T., Lerch, M., Müller, G., Spanhel, L., Emmerling, A., ...
Highly concentrated 0.5 M II-VI semiconductor quantum dot solutions for coating applications can be synthesized employing chalcogenolysis and condensation of functionalized cluster-like cadmium and...
Preparation of monolithic crystalline lead titanate aerogels (1998)
Löbmann, P., Glaubitt, W., Müller, G., Geis, S., Fricke, J.
Lead titanate gels were prepared via sol-gel synthesis and dried either in supercritical carbon dioxide or isopropanol. Both types of aerogels were characterized by means of thermal analysis and...
Determination of the thermal diffusivity in diathermal materials by the laser-flash technique (1998)
Aerogels containing strongly photoluminescing zinc oxide nanocrystals (1998)
Lorenz, C., Emmerling, A., Fricke, J., Schmidt, T., Hilgendorf, M., Spanhel, L., ...
Densification and crystallization of lead titanate aerogels (1997)
Löbmann, P., Glaubitt, W., Fricke, J.
Crack-free monolithic lead titanate (PbTiO3, or PT) aerogels were prepared via a sol-gel process and dreying in supercritical carbon dioxide. The material was characterized by thermogravimetric...
We present a new method to derive transport equations for quantum many-particle systems. This method uses an equation-of-motion technique and is applicable to systems with bosons and fermions,...
Fricke, J., Meden, V., Wohler, C., Schonhammer, K.
We study transport equations for quantum many-particle systems in terms of correlations by applying the general formalism developed in an earlier paper to exactly soluble electron-phonon models. The...
Structural investigations on lead titanate xerogels and aerogels (1996)
Löbmann, P., Gross, J., Glaubitt, W., Fricke, J.
The preparation of highly porous piezoelectric materials offers a promising route to ultrasonic transducers with low acoustic impedancees suitable for ranging applications or gas flow measurements....
Preparation and characterization of lead titanate aerogels (1995)
Löbmann, P., Glaubitt, W., Gross, J., Fricke, J.
Modified transition metal alkoxides with polymerizable organic ligands were synthesized which are worthwhile precursors for the development of novel inorganic-organic materials. Titanium...
Control of solar insolation via thermochromic light-switching gels (1995)
Beck, A., Körner, W., Scheller, H., Fricke, J., Platzer, W.J., Wittwer, V.
Nanostructure and optical transparency of silica aerogels (1993)
Emmerling, A., Wang, P., Popp, G., Beck, A., Fricke, J.
No abstract available
Nanostructure and optical transparency of silica aerogels (1993)
Emmerling, A., Wang, P., Popp, G., Beck, A., Fricke, J.
No abstract available
Nanostructure and optical transparency of silica aerogels (1993)
Emmerling, A., Wang, P., Popp, G., Beck, A., Fricke, J.
No abstract available
Synthesis and characterization of mullite aerogels (1992)
Raether, F., Heinrich, T., Fricke, J., Tappert, W.
A serious problem in the production of homogenous binary gels is the different reactivity of the alkoxides used. In the special case of silicon alkoxides and aluminium alkoxides, the difference is...
SAXS measurements of the condensation in mullite precursors (1991)
Heinrich, T., Raether, F., Spormann, O., Fricke, J.
Mullite in the composition 3Al2O3.2SiO2 is applied as refractory material. One way to make ultrafine and homogenous mullite powders is the controlled hydrolysis and condensation of an alcoholic...
An anonymous DNA probe H31 (D11S348) on chromosome 11 detects a Hindlll polymorphism (1990)
Warnich, L., Dietzsch, E., Brusnicky, J., Herbert, J.S., Fricke, J., Retief, A.E.
Conrad, H., Fricke, J., Reichenauer, G.
Neutron backscattering has been applied for the determination of the crossover frequencies ωco and spectral exponent x of three base-catalyzed silica aerogels. The crossover frequencies and...
LIGHT SCATTERING FOR STRUCTURAL INVESTIGATIONS OF SILICA AEROGELS AND ALCOGELS (1989)
Beck, A., Gelsen, O., Wang, P., Fricke, J.
A scattering apparatus is described which allows the investigation of gels and aerogels with visible light. The correction formulas for various typical geometries are derived. Scattering data for...
MECHANICAL PROPERTIES OF SiO2 - AEROGELS (1989)
Cross, J., Goswin, R., Gerlach, R., Fricke, J.
The mechanical behavior of SiO2 - aerogels was investigated in ultrasonic and static compression experiments. In our paper we present data on the sound velocity as a function of density, of external...
THERMAL PROPERTIES OF SILICA AEROGELS (1989)
Fricke, J., HÜmmer, E., Scheuerpflug, P.
The extremely low density of aerogels drastically influences all thermal properties : Compared to vitreous silica, aerogels show enhanced radiative heat transfer ; the solid conduction is reduced by...
THERMAL TRANSPORT IN MONOLITHIC SILICA AEROGEL (1989)
Caps, R., DÖll, G., Fricke, J., Heinemann, U., Hetfleisch, J.
Measurements on the thermal transport in SiO2 aerogel tiles (thickness about 8 mm) were performed for two densities (ρ = 110 kg.m-3 and 270 kg.m-3), for emissivities ε = 0,04 and 0,77, in...
VIBRATIONAL DENSITY OF STATES FOR LOW-DENSITY SILICA AEROGELS (1989)
Reichenauer, G., Buchenau, U., Fricke, J.
The vibrational density of states for highly porous silica aerogels (ρ = 120 kg/m3 and 250 kg/m3) were studied with inelastic neutron scattering in the frequency range from 0.02 THz to 2 THz....
Conrad, H., Fricke, J., Reichenauer, G.
Neutron backscattering has been applied for the determination of the crossover frequencies ωco and spectral exponent x of three base-catalyzed silica aerogels. The crossover frequencies and...
LIGHT SCATTERING FOR STRUCTURAL INVESTIGATIONS OF SILICA AEROGELS AND ALCOGELS (1989)
Beck, A., Gelsen, O., Wang, P., Fricke, J.
A scattering apparatus is described which allows the investigation of gels and aerogels with visible light. The correction formulas for various typical geometries are derived. Scattering data for...
MECHANICAL PROPERTIES OF SiO2 - AEROGELS (1989)
Cross, J., Goswin, R., Gerlach, R., Fricke, J.
The mechanical behavior of SiO2 - aerogels was investigated in ultrasonic and static compression experiments. In our paper we present data on the sound velocity as a function of density, of external...
THERMAL PROPERTIES OF SILICA AEROGELS (1989)
Fricke, J., HÜmmer, E., Scheuerpflug, P.
The extremely low density of aerogels drastically influences all thermal properties : Compared to vitreous silica, aerogels show enhanced radiative heat transfer ; the solid conduction is reduced by...
THERMAL TRANSPORT IN MONOLITHIC SILICA AEROGEL (1989)
Caps, R., DÖll, G., Fricke, J., Heinemann, U., Hetfleisch, J.
Measurements on the thermal transport in SiO2 aerogel tiles (thickness about 8 mm) were performed for two densities (ρ = 110 kg.m-3 and 270 kg.m-3), for emissivities ε = 0,04 and 0,77, in...
VIBRATIONAL DENSITY OF STATES FOR LOW-DENSITY SILICA AEROGELS (1989)
Reichenauer, G., Buchenau, U., Fricke, J.
The vibrational density of states for highly porous silica aerogels (ρ = 120 kg/m3 and 250 kg/m3) were studied with inelastic neutron scattering in the frequency range from 0.02 THz to 2 THz....
Conrad, H., Fricke, J., Reichenauer, G.
Neutron backscattering has been applied for the determination of the crossover frequencies ωco and spectral exponent x of three base-catalyzed silica aerogels. The crossover frequencies and...
LIGHT SCATTERING FOR STRUCTURAL INVESTIGATIONS OF SILICA AEROGELS AND ALCOGELS (1989)
Beck, A., Gelsen, O., Wang, P., Fricke, J.
A scattering apparatus is described which allows the investigation of gels and aerogels with visible light. The correction formulas for various typical geometries are derived. Scattering data for...
MECHANICAL PROPERTIES OF SiO2 - AEROGELS (1989)
Cross, J., Goswin, R., Gerlach, R., Fricke, J.
The mechanical behavior of SiO2 - aerogels was investigated in ultrasonic and static compression experiments. In our paper we present data on the sound velocity as a function of density, of external...
THERMAL PROPERTIES OF SILICA AEROGELS (1989)
Fricke, J., HÜmmer, E., Scheuerpflug, P.
The extremely low density of aerogels drastically influences all thermal properties : Compared to vitreous silica, aerogels show enhanced radiative heat transfer ; the solid conduction is reduced by...
THERMAL TRANSPORT IN MONOLITHIC SILICA AEROGEL (1989)
Caps, R., DÖll, G., Fricke, J., Heinemann, U., Hetfleisch, J.
Measurements on the thermal transport in SiO2 aerogel tiles (thickness about 8 mm) were performed for two densities (ρ = 110 kg.m-3 and 270 kg.m-3), for emissivities ε = 0,04 and 0,77, in...
VIBRATIONAL DENSITY OF STATES FOR LOW-DENSITY SILICA AEROGELS (1989)
Reichenauer, G., Buchenau, U., Fricke, J.
The vibrational density of states for highly porous silica aerogels (ρ = 120 kg/m3 and 250 kg/m3) were studied with inelastic neutron scattering in the frequency range from 0.02 THz to 2 THz....
Frequent RFLP recognised by an anonymous sequence localise to 11q13 - Q14[D11S. 3.7.(E79)] (1987)
Dietzsch, E., Retief, A. E., Fricke, J., Plessis, L. Du, Nicholson, D. L., Kotze, M. J.
A three-allele RFLP recognised by an anonymous sequence localised to 3p14-p21 [D3S11 (E41)] (1987)
Dietzsch, E., Retief, A.E., Plessis, L.du, Fricke, J., Kotze, M.J., Nicholson, D.L., ...
In the above paper it was stated that hybridization of the probe to Taq I digested human DNA detects a 3 allele polymorphism with Fragment sizes 20.0kb (Al), 12.2kb (A2) or 8.4kb + 3.2kb (A3), and an...
A three-allele RFLP recognised by an anonymous sequence localized to 3pl4 - p21 [D3S11 (E41)] (1986)
Dietzsch, E., Retief, A.E., Du Plessis, L., Fricke, J., Kotze, M.J., Nicholson, D.L., ...
Supraleitende Wendelsektion zur Beschleunigung von Protonen. (1973)
Dissertation, Univ.Karlsruhe 1973
Fricke, J, Neuhard, J, Kelln, R A, Pedersen, S
A gene encoding a polypeptide of 25 kDa is located immediately upstream of the gene for ribosomal protein S1, rpsA. In high gene copy number, this gene, mssA, was previously found to suppress defects...
A three-allele RFLP recognised by an anonymous sequence localized to 3p14-p21 [D3S11 (E41)]
Dietzsch, E, Retief, A E, Du Plessis, L, Fricke, J, Kotze, M J, Nicholson, D L, ...
An anonymous DNA probe H31 (D11S348) on chromosome 11 detects a HindIII polymorphism
Warnich, L., Dietzsch, E., Brusnický, J., Herbert, J.S., Fricke, J., Retief, A.E.
Frequent RFLP recognised by an anonymous sequence localised to 11q13 - q14 [D11S.3.7.(E79)].
Dietzsch, E, Retief, A E, Fricke, J, Du Plessis, L, Nicholson, D L, Kotze, M J
Fricke, J, Neuhard, J, Kelln, R A, Pedersen, S
A gene encoding a polypeptide of 25 kDa is located immediately upstream of the gene for ribosomal protein S1, rpsA. In high gene copy number, this gene, mssA, was previously found to suppress defects...
A three-allele RFLP recognised by an anonymous sequence localized to 3p14-p21 [D3S11 (E41)]
Dietzsch, E, Retief, A E, Du Plessis, L, Fricke, J, Kotze, M J, Nicholson, D L, ...
An anonymous DNA probe H31 (D11S348) on chromosome 11 detects a HindIII polymorphism
Warnich, L., Dietzsch, E., Brusnický, J., Herbert, J.S., Fricke, J., Retief, A.E.
Frequent RFLP recognised by an anonymous sequence localised to 11q13 - q14 [D11S.3.7.(E79)].
Dietzsch, E, Retief, A E, Fricke, J, Du Plessis, L, Nicholson, D L, Kotze, M J