ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

Hits per page

hits 1 - 4 | 4 hits

Sorting

Electronic Resource

Pyroelectric infrared detector for precision earth sensor (1989)

Nakamura, Kunio ; Ishigaki, Takeo ; Kaneko, Akira ; [et al.]

Springer

International journal of infrared and millimeter waves 10 (1989), S. 907-930

add to mindlist on the mindlist

Details

ISSN: 1572-9559

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract Two new types of infrared detectors have been developed for the precision earth sensor in the three axis stabilized satellite, Engineering Test Satellite VI (ETS-VI). Both detectors have a pair of infrared sensing elements, each of which is made of a pyroelectric material and mounted on an immersion lens. A-type element is a flake of lead titanate ceramic, and B-type is a sputtered epitaxial film of calcium-modified lead titanate. The precision earth sensor consists of a scanning mirror and an infrared telescope containing an objective lens, plus either type of infrared detector. Detectivity of each type at 120Hz, which is the nominal frequency of the earth sensor's signal, is 1.5×109Hz1/2/W(A-type) and 2.7×109Hz1/2/W(B-type) at 14∼16.25μm. Each value is 2.5 and 4.5 times as high as the previous model in ETS-V. A-type detector passed the space environmental test and the random error cf attitude measurement was 0.03 deg with the preliminary model of the earth sensor being ahead of the breadboard model. This measurement accuracy is nearly equal to that of the foremost earth sensor. A-type was chosen as the detector for ETS-VI. The random error of the earth sensor with B-type detector is 0.012deg, smaller than a half of the A-type sensor's error. Investigation of B-type is being continued in order to confirm its reliability for space use.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01010388

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Polymerization reaction with diphenylphosphoryl azide. Preparation of polyamides, polyureas and polyurethanes (1991)

Nishi, Norio ; Tsunemi, Masahiko ; Nakamura, Kunio ; [et al.]

New York : Wiley-Blackwell

Die Makromolekulare Chemie 192 (1991), S. 1811-1820

add to mindlist on the mindlist

Details

ISSN: 0025-116X

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Notes: The preparation of various polyamides, polyureas and polyurethanes by polymerization reactions with diphenylphosphoryl azide (DPPA) was investigated. Various polyamides were obtained very conveniently by polymerization of aminocarboxylic acids or copolymerization of dicarboxylic acids and diamines. Polyureas were mainly obtained by conversion of dicarboxylic acids to acyl azides with DPPA and then to isocyanates, followed by copolymerization of these diisocyanates with diamines. Further, the polymerization of some aminocarboxylic acids that have an amino group of low nucleophilicity (such as p-aminobenzoic acid) was found to give polyureas instead of polyamides by direct polymerization. Polyurethanes were also obtained from dicarboxylic acids and diols through the Curtius rearrangement of acyl azides, similarly as in the polyurea preparations. The products were identified with the help of IR spectra and elemental analyses, and their molecular weights were evaluated viscometrically.

Additional Material: 2 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/macp.1991.021920815

Permalink

	Location	Call Number	Expected	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Mechanical properties of solvolysis lignin-derived polyurethanes (1991)

Nakamura, Kunio ; Mörck, Roland ; Reimann, Anders ; [et al.]

New York, NY : Wiley-Blackwell

Polymers for Advanced Technologies 2 (1991), S. 41-47

add to mindlist on the mindlist

Details

ISSN: 1042-7147

Keywords: Polyurethane ; Solvolysis lignin ; Tensile properties ; Diphenylmethane diisocyanate ; Crosslinking ; Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: In order to study the tensile properties of solvolysis lignin polyurethanes, polyurethane (PU) films were prepared from the solvolysis lignin (SL)-polyethylene glycol (PEG)-diphenylmethane diisocyanate (MDI) system, and in addition to this further PU films were also prepared from the SL-MDI system. In the SL-PEG-MDI system, the SL content, the molecular weight of PEG and the NCO:OH ratio were varied in order to control the physical properties. The tensile stress and Young's modulus of the PUs of the SL-PEG-MDI type increased with increasing SL content and NCO:OH ratio. The tensile properties of the PUs from the SL-MDI system showed no NCO:OH ratio dependency; i.e. the mechanical properties of PUs are not influenced by the change in crosslinking. It is possible to control the tensile properties of PUs of the SL-PEG-MDI type by changing the content of PEG and SL at a constant NCO:OH ratio.

Additional Material: 5 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/pat.1991.220020106

Permalink