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  • 2005-2009
  • 1990-1994  (15)
  • 1985-1989  (7)
  • 1993  (15)
  • 1987  (7)
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  • 2005-2009
  • 1990-1994  (15)
  • 1985-1989  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Scanning Lorentz electron microscope with high resolution and observation of bit profiles recorded on sputtered longitudinal media (invited) : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5811-5815 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A transmission electron microscope operating with a cold field emission source has been modified to facilitate differential phase contrast mapping and applied to the observation of microscopic magnetic features appearing in recorded longitudinal media. After describing the design and performance of the scanning Lorentz electron microscope, as we call it, results on the observation of bit patterns delineated on Co-based sputtered longitudinal media are presented. Relations of observed bit profiles to macroscopic magnetic properties of media and to device performance are discussed. Then, magnetization fluctuation on a scale of magnetic crystallites constituting the medium is examined. Also given is an account of a stray field effect inherent in hard magnetic materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353534
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Triplet exciton formation due to interaction between singlet excitons in polydiacetylene (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 7404-7416 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The time-resolved spectroscopy in polydiacetylene single crystals (PDA-MADF {poly-1-[3-(methylamino)phenyl]-4-[3,5-bis(trifluoromethyl)phenyl]-1, 3-butadiyne}) on femtosecond and picosecond time scales was performed. The time dependence of the photoinduced reflectance change in PDA-MADF exhibits three components with lifetimes ∼200 fs, 1–2 ps, and (very-much-greater-than)200 ps. These components are assigned to the free 1Bu excitons, self-trapped excitons, and triplet excitons. From the excitation intensity dependence of the reflectance change, a significant role of bimolecular interactions between singlet excitons for the formation of triplet excitons is clarified. A model of the mechanism of triplet exciton formation after the creation of singlet excitons is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465721
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    4.8-keV x-ray backlight framing method for observing images of soft-x-ray-driven fusion capsules (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 706-710 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report on a diagnostic method for observing the implosion asymmetry of soft-x-ray-driven fusion capsules. The method consists of an x-ray backlight source using a 4.8-keV quasi-monochromatic titanium x-ray source and a fast multiframe x-ray imaging system. With the proper combination of spectral filters and photocathode to reduce intense background x rays from a gold cavity plasma, x-ray backlighting images of the fusion capsules have been successively obtained with spatial and temporal resolutions of 20 μm and 80 ps, respectively. These images are used to study the implosion velocity and the lower-mode distortion caused by x-ray irradiation nonuniformity on the imploding fusion capsule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144202
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Design and fabrication of thin-film heads based on a dry process (invited) (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4157-4162 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High performance thin-film heads for disk drive systems have been developed based on a dry process. Heads were computer simulated and optimal design was carried out. Relationships among Ni-Fe composition, domain structure and wiggle of the read-write waveform were obtained. Based on these results, optimum Ni-Fe composition range was determined. A planarization procedure for an inbedding insulator of the conductor coil was developed. Also narrow track patterning and gap depth controlling procedures were developed. Using these procedures, a two-layered seventeen-turn thin-film head for a large capacity disk drive system (23 Mb/in.2) has been developed. The head exhibited excellent read-write characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338514
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Properties of Fe-Al-Si-N thin films prepared by N2 reactive sputtering (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3844-3846 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have attempted to prepare Fe-Al-Si-N films by rf magnetron sputtering in an atmosphere of Ar+N2, employing an Fe-Al-Si target, and investigated the influence of nitrogen on the properties of sendust alloys. Some properties, such as Vicker's hardness and electrical resistivity of the films, were improved in the presence of nitrogen. In addition, the Fe-Al-Si-N films interestingly show superior magnetic properties to those of sendust films. For example, effective permeability at 1 MHz of the film, prepared under the selected conditions, reached a maximum of approximately 4000, exceeding 2200 of our standard sendust film. The microstructure of Fe-Al-Si-N and Fe-Al-Si films has been observed using scanning electron microscopy. As a result, we have found a difference in microstructure between the nitrogen-containing films and the regular films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338616
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    High-speed InP/InGaAs double-heterostructure bipolar transistors with suppressed collector current blocking (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2372-2374 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: InP/InGaAs double-heterostructure bipolar transistors (DHBTs), incorporating a new collector structure featuring "pn pair doping'' in the heterointerface vicinity, have been fabricated using a low-pressure metalorganic chemical vapor deposition (MOCVD) method. These transistors provide high collector current densities over 1×105 A/cm2, indicating the successful suppression of current blocking. S-parameter measurements determine the high current gain cutoff frequencies of 130 GHz. These values favorably compare with those of conventional InGaAs-collector HBTs fabricated for comparison, suggesting that the InP collectors have excellent electron transport properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109368
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  • 7
    Electronic Resource
    Electronic Resource
    Wide temperature scaling law of the secondary peak observed in magnetization curves of single crystals (La,Sr)2CuO4 (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1830-1832 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetization curves of single crystals (La1−xSrx)2CuO4 with various Sr contents were measured. A distinct increase of magnetization with increasing applied field was observed in Sr overdoped compositions, when the magnetic field was applied perpendicular to the CuO2 plane. The field, Bpk , where magnetization showed a maximum value, was strongly dependent on temperature. Its dependence was expressed by a universal relation (square root of)Bpk = c(x)[1−T/Tc(x)] over a wide temperature range; between 4.2 K and Tc. Possible mechanisms which give rise to the observed distinct secondary peak effect are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109563
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Gain-guided laser diode having a curved-mirror-cavity with a low astigmatism (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 726-728 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A gain-guided laser diode having a curved-mirror-cavity that has coaxial mirrors and a fan-shaped stripe structure has been fabricated by dry etching. Although gain guided, the laser has an astigmatism of 4.1 μm, which is very low compared to conventional laser's. The threshold current of the laser is 35 mA, the longitudinal mode spectrum is multiple, and the transverse optical mode is fundamental. These results are comparable to conventional gain-guided lasers. Etched mirror laser diodes with flat facets have been stably operated over 1500 h under automatic-power control at a power of 3 mW/facet at 50 °C, without facet coating
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109941
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Excited-state absorption spectroscopy of ortho-metalated iridium(III) complexes (1987)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 91 (1987), S. 6104-6106 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100308a012
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Sequencing of a Clostridium thermocellum gene (cipA) encoding the cellulosomal SL-protein reveals an unusual degree of internal homology (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 8 (1993), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: It is known that two proteins of the cellulosomal complex of Clostridium thermocellum (SL and Ss) together degrade crystalline cellulose. SL is a glycoprotein of 210000Da which enhances the binding to cellulose and the activity of Ss, an endoglucanase of 83000 Da. We have previously reported the cloning of a DNA fragment encoding the N-terminal end of the SL protein using antibodies raised against the native protein. A chromosomal walking approach using an EcoRI and a BamHI-Sau3A gene library allowed us to isolate the C-terminal end of the gene. Sequencing of both fragments revealed the existence of a leader peptide as has been found in cellulases of the same organism. This leader sequence is followed by a stretch of 14 amino acids that is identical to the N-terminal amino acid sequence of the native secreted protein. The open reading frame (ORF) of this gene encodes a protein of 196800 Da and is followed by a hairpin loop that could be involved in transcription termination. Within the open reading frame (ORF), we found nine internal repeated elements (IREs) of about 500 nucleotides each. Seven of these sequences displayed 98–100% homology and were located adjacent to each other within the structural gene without intervening regions. The remaining two, located on the N-terminal end of the gene, showed a significantly lower homology. Bearing in mind the inherent instability of reiterated regions, we confirmed the authenticity of our clones by Southern blot analysis using chromosomal C. thermocellum DNA and ruled out the possibility of rearrangements during the cloning and sequencing process. The sequenced gene is designated clpA and the encoded SL protein CipA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1993.tb01576.x
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