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  • 1
    Digitale Medien
    Digitale Medien
    Magnetic properties of Fe(Co) metal particles prepared with exfoliated MoS2 monolayers : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6668-6670 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Monomolecular layers of exfoliated MoS2 are incorporated in the process of the formation of Co ferrite from aqueous solutions. The presence of MoS2 is found to limit the coalescence of particles during reduction to Fe(Co) metal. That MoS2 inhibits the full conversion to metal is confirmed by Mössbauer effect spectroscopy. Magnetization measurements are interpreted on the basis of noncollinear magnetization patterns resulting from competing surface anisotropies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.352550
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  • 2
    Digitale Medien
    Digitale Medien
    Effect of additives on hot deformation behavior of melt-spun Nd-Fe-Co-B magnets : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6363-6365 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of various additives on hot workability was investigated for alloy systems of (Nd13.6−xRx)(Fe77.6−yTyCo2.8)B6.0: R=Ce, Dy; x=0, 1, 2; T=Al, Si, V, Cu, Ga, Zr, Nb, Mo, Sn; y=0, 0.5, 1.0. A semiquantitative comparison of the effect of various additives was made by measuring the crack opening displacement (CODmax) in test specimens deformed in an open (unconstrained) configuration. Among the additives, cerium and silicon improved the hot workability while niobium and tin severely deteriorated the workability. The remanence anisotropy ratio was inversely related to CODmax. Detailed microstructural investigations were carried out with alloys which had only cerium or tin to study the reason for their hot workability behavior in comparison to the base alloy. The improved hot workability of cerium added alloy is related to the lower melting temperature of the intergranular phase and faster grain growth compared to the base alloy. Tin addition prevented grain growth with no endothermic peak in a differential thermal analysis curve, indicating the absence of boundary phase melting, and leading to poor hot workability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349943
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  • 3
    Digitale Medien
    Digitale Medien
    Magnetic properties of CoxFe3−xO4 during conversion from normal to inverse spinel particles : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6728-6730 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Cobalt ferrite, CoxFe3−xO4 with 0.55≤x≤0.8, is produced by precipitation from aqueous solutions. Drying and annealing at temperatures below 300 °C results in a coercivity that increases with increasing temperature. Mössbauer effect spectroscopy and magnetic measurements are consistent with the interpretation that these Co ferrites have a (mostly) normal spinel structure as made. These convert to a (mostly) inverse spinel structure on thermal aging. No significant morphological changes occur during this transformation. Coercivities as high as μ0Hc=0.2 T are observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.352516
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  • 4
    Digitale Medien
    Digitale Medien
    Hot workability of melt-spun Nd-Fe-Co-B magnets : 35TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS San Diego, California (USA) 29 Oct−1 Nov 1990 (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 5841-5843 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Anisotropic Nd-Fe-B magnets are produced from melt-spun ribbons by hot working technique. The processing is facilitated by improved workability. In order to obtain a sound magnet, it is important to suppress the crack initiation and growth. An investigation was carried out to study the deformation mechanism of the alloy system and to improve workability by changes in alloy composition. Alloy ribbons with composition (Nd13.6−xRx) (Fe77.6−y Ty Co2.8)B6.0 [R=Ce, Dy; T=Al, Si, V, Cu, Ga, Zr, Nb, Mo, Sn; x= 0, 1, 2; y=0, 0.5, 1.0] were prepared by melt spinning and then hot pressed into fully dense compacts. These compacts were upset in a hot working simulator. Hot workability was evaluated by measuring the crack opening displacement on the surface at the half height of the upset specimen. The relationship between strain rate and flow stress was found to be expressed by the equation: ε(overdot) = Aσn exp( − Q/RT). Values of n and Q were obtained for quarternary composition (Nd-Fe-Co-B). The effects of strain and strain rate on magnetic properties were also studied for quarternary composition. Of the additive elements, cerium and silicon addition showed significant improvement in workability without loss of coercivity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.347844
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  • 5
    Digitale Medien
    Digitale Medien
    Spectral narrowing of photoluminescence and improvement of electroluminescent properties in conducting polymers with Si atoms in main chains (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 6061-6065 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Optical properties of conducting polymers with Si atoms in main chains, such as optical absorption, photoluminescence (PL), and electroluminescence (EL), have been studied. The electronic energy structures have been determined by optical and electrochemical measurements. The strong PL with high quantum efficiency has been clarified, and spectral narrowing has been observed by pulse excitation of a nitrogen laser. Intense blue or red EL has also been demonstrated and the emission efficiency has been improved by anode surface modification and annealing. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1416863
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  • 6
    Digitale Medien
    Digitale Medien
    The use of magnetic fields in a partial-coaxial microwave cavity holey-plate ion source (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 66-69 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A low-pressure and high-density microwave ion source created and sustained by evanescent waves emitted from a holey plate, and using permanent magnet multicusp fields, has been studied. This source is called a holey-plate ion source. Microwave power at 2.45 GHz is supplied from a coaxial cavity and then converted into an evanescent mode through the use of a holey plate. This source can produce low-pressure and high-density plasma using an octopole magnetic field. The ion current densities are in excess of 4.8 mA/cm2 at an extraction voltage of 3 kV, an argon gas pressure of 0.3 Pa in the plasma chamber, and an input microwave power of 80 W. An 18-mm-diam ion beam is extracted and accelerated from the ion source. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150162
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  • 7
    Digitale Medien
    Digitale Medien
    A novel tumour marker RCAS1 in a case of extramammary Paget's disease (2003)
    Oxford, UK : Blackwell Science Ltd
    Clinical and experimental dermatology 28 (2003), S. 0 
    Details
    ISSN: 1365-2230
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: A 66-year-old male, whose primary skin lesion in extramammary Paget's disease had been surgically resected 4 years previously, was hospitalized with liver metastases. Hepatic arterial infusion chemotherapy was carried out and the tumours clearly reduced in size. Serum levels of some common tumour markers were not elevated, even prior to therapy. We measured serum levels of a novel tumour-associated antigen, RCAS1, because its expression was detected in the tumour cells. The patient's serum RCAS1 level was elevated (22.0 U/mL) before therapy and fell during (10.5 U/mL) and after (5.0 U/mL) therapy. Therefore, serum RCAS1 levels may be valuable as a potential biomarker for monitoring therapeutic efficacy against Paget's disease.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2230.2003.01251.x
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  • 8
    Digitale Medien
    Digitale Medien
    Localization of sphingomyelin during the development of dorsal and tail epidermis of mice (2001)
    Oxford, UK : Blackwell Science Ltd
    British journal of dermatology 145 (2001), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background The water permeability barrier of the stratum corneum seems to be regulated primarily by lamellar bodies situated between the corneocytes; the lamellar bodies originate largely from polar lipid precursors, mainly sphingomyelin (SM), provided by the cells of the stratum granulosum via exocytosis of their lamellar body content. Objectives The aim of our study was to evaluate the cellular distribution of SM during development of the epidermis. Methods In this study, we investigated the expression and localization of SM in both adult and fetal mouse skin by a cytochemical detection method, immunofluorescence microscopy and immunoelectron microscopy, using anti-SM antibody, a specific binding protein to SM (lysenin), and Nile red stain. In addition, we measured transepidermal water loss to estimate the barrier function of the fetal skin. Results We observed that SM was widely distributed from the basal layer to the granular layer in the adult mouse epidermis. An intense cytochemical reaction for SM was observed on embryonic day E14·5 of gestation just before the differentiation of the granular and squamous cells from the intermediate cells. The immunofluorescence indicating SM was detected in two regions, i.e. the most superficial zone of the granular layer and the upper spinous layer after the cell differentiation at the late gestational age. This distribution was not detected by conventional lipid staining, such as with Nile red stain. Immunoelectron microscopy revealed that SM was mainly localized in the intercellular spaces of the adult mouse epidermis and in the intracellular vesicles without a complete lamellar structure in the cytoplasm of epidermal cells of E14·5 fetuses. It is well known that the formation of the structurally mature cornified cell envelope occurs at E15·5 of development. The skin of fetuses at E16·5 showed a definite barrier function. Conclusions These findings suggest that SM dynamics is related to the formation of the lipid envelope, cell differentiation, and epidermal barrier function during development.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2133.2001.04489.x
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  • 9
    Digitale Medien
    Digitale Medien
    Physical and personality traits of preschool children in Fuzhou, China: only child vs sibling (2000)
    London : Blackwell Science Ltd
    Child 26 (2000), S. 0 
    Details
    ISSN: 1365-2214
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Psychologie
    Notizen: Concern about the healthy growth and development of an only child has been voiced since the 1970s, when the Chinese government launched the only child policy. In this study, the physical and personality traits of rural Chinese preschool only-children (onlies) whose age ranged from 3 to 6 years old were evaluated. The sample included 197 onlies and 367 children with siblings who came from seven kindergartens in rural areas in Fuzhou, Fujian province. The results showed no statistically significant differences in height, mass or BMI between the onlies and siblings. Regarding the personality traits, the significant difference was that the onlies exhibited more somatic complaints, however, the data didn’t indicate any other undesirable personality traits for the onlies. These results suggest that Chinese preschool children grow normally with or without siblings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2214.2000.00143.x
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  • 10
    Digitale Medien
    Digitale Medien
    Low-frequency perturbation theory in eddy-current non-destructive evaluation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4090-4100 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A method is presented by which series solutions for the impedance change in an eddy-current test probe due to closed cracks in a non-magnetic, conducting half-space can be derived at low frequency. The series solution is applicable for flaws whose dimensions are much smaller than the electromagnetic skin-depth. The problem is formulated using an approach in which the flaw is represented by an equivalent distribution of current dipoles. The electric field scattered by the flaw is then written as an integral, over the flaw, of the product of the dipole density distribution and an appropriate Green's function. Terms in the series expansion for the dipole density are calculated by solving the integral equation at each order in the chosen small parameter, using perturbation theory and a dual integral equation method. The impedance change due to the crack is then calculated from the dipole distribution using the reciprocity theorem. Example solutions are given for semi-circular surface-breaking cracks and for long, uniformly deep surface-breaking cracks. Results are compared with other analytical solutions and the predictions of an independent numerical scheme, and very good agreement is observed. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363280
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