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  • 1
    Electronic Resource
    Electronic Resource
    Evidence for amorphous multilayered silicon obtained by deposition under modulated pressure of hydrogen (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4536-4537 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method of fabrication of layered structure of silicon is presented. The silicon was evaporated continuously under a modulated pressure of hydrogen. A contrast was dense and less dense silicon layers is evidenced by low-angle x-ray scattering and cross-sectional electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341282
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  • 2
    Electronic Resource
    Electronic Resource
    Interdiffusion and chemical ordering in composition-modulated Fe70Si30/Si amorphous thin films (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1229-1233 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interdiffusivity and chemical ordering in compositionally modulated (Λ=20 to 40 A(ring)) amorphous Fe70Si30/Si thin films have been measured from the decay of the satellite intensities of the (000) x-ray scattering peak during isothermal anneals in the temperature range 373–473 K. Diffusivities as low as 10−26 to 10−25 m2 s−1 have been measured. A linear dependence of D˜Λ on 1/Λ2 has been observed, providing the evidence of chemical ordering in Fe-Si alloy and leading to the determination of a critical wavelength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336141
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  • 3
    Electronic Resource
    Electronic Resource
    Electronic configuration of cerium in amorphous alloys (invited; abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3154-3154 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the effect of structural disorder on the valence of cerium in different families of amorphous alloys prepared by coevaporation on to cryogenic substrates. The Ce electronic configuration was characterized by LIII x-ray absorption spectroscopy and bulk magnetization measurements. Special attention was paid to the amorphous analogs of prototypic Kondo and strongly mixed valent compounds in the crystalline state, such as Ce Si2 (TK(approximately-equal-to)200 K), CemNin, CemCon. The cerium was found to be purely trivalent in amorphous CexSi1−x (0≤x≤0.75) alloys over both the metallic and nonmetallic concentration ranges, so that the weakly mixed valent state in crystalline CeSi2 is believed to rely on details of the crystalline symmetry and band structure. In contrast, the cerium was found to remain mixed valent in amorphous CexCo1−x (0.15≤x≤0.75) and CexNi1−x (0.30≤x≤0.60) alloys, without any significant effect of the structural disorder. The concentration dependence of the Ce valence anomaly was found to be different in the Ce Ni and Ce Co alloys. This different behavior is discussed in terms of electronic band structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335188
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  • 4
    Electronic Resource
    Electronic Resource
    Short-range effects on hyperfine fields in amorphous CoSn alloys (abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3554-3554 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the 59Co and 119Sn hyperfine fields in amorphous CoSn alloys obtained by coevaporation onto cryogenic substrates. 59Co spin-echo spectra were measured at 1.4 K in zero-applied field on ferromagnetic Cox Sn1−x (0.65≤x≤0.80) alloys. NMR spectra display peaks. These peaks have a relative intensity which varies with composition, but their average location in frequency is concentration independent. From a comparison with 59Co NMR spectra in crystalline Co with dilute Sn impurities, it is inferred that the structures observed in NMR spectra for amorphous CoSn alloys are related to the number of Sn first neighbors of the Co resonant nuclei. Thus, short-range effects are thought to be predominant in determining the Co on-site moments in these alloys, as well as in amorphous Co alloys with other s-p elements. 119Sn Mössbauer spectra were measured at room temperature on paramagnetic Cox Sn1−x (0.40≤x≤0.55) alloys. Comparison is made with the stoichiometric CoSn crystalline compound, where quadrupolar interactions give rise to an admixture of two doublets corresponding to the two inequivalent Sn sites. Mössbauer spectra for the amorphous CoSn alloys display a single doublet identified as arising from Sn atoms in trigonal prisms arrangements. These results are discussed within the frame of current models for the structure of metallic glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335005
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of specific volumes in multilayers by anomalous X-ray scattering (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 21 (1988), S. 317-321 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: X-ray diffraction in multilayer structures is determined by the electronic concentration profile, which depends both on the atomic concentration and on the specific volume. Probing with photons of different wavelengths in the vicinity of an absorption edge (anomalous X-ray scattering) produces a variation of the scattered intensity, which allows the separation of both contributions. A test of the feasibility of this method on several multilayer samples is presented. The technique appears to be sensitive enough to measure specific volume ratios with a precision of about 5%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988800247X
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  • 6
    Electronic Resource
    Electronic Resource
    Computed tomography of the rectum with water as contrast agent (1989)
    Springer
    Abdominal imaging 14 (1989), S. 345-348 
    Details
    ISSN: 1432-0509
    Keywords: Contrast medium ; CT ; Rectum ; Sigmoid ; Staging rectal tumours ; Water
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The use of intrarectally administered plain tap water as a contrast medium for CT scan of the rectum and sigmoid combined with iv iodine contrast medium was prospectively studied in 28 patients. This method allowed correct demonstration of mural wall abnormalities in all patients and therefore represents a simple, inexpensive, and efficient modality for CT study of the rectum and sigmoid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01889234
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  • 7
    Electronic Resource
    Electronic Resource
    Uneven Lipomatosis: A pitfall in pancreatic Sonography (1989)
    Springer
    Abdominal imaging 14 (1989), S. 233-237 
    Details
    ISSN: 1432-0509
    Keywords: Pancreas, ultrasound ; Lipomatosis ; Embryology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A marked difference in echogenicity between the anterior and posterior parts of the pancreatic head was demonstrated by pancreatic ultrasound in 4 patients. This finding could not be related to local pancreatic or peripancreatic pathology. In all patients the dorsal portion of the head, including the uncinate process, appeared less echogenic than the ventral part of the head, body, and tail. The level of demarcation was identical in all 4 cases, coinciding with the expected fusion line of the embryological dorsal and ventral pancreatic origin. Pathology available in 1 patient showed an uneven lipomatosis as an explanation for this hitherto unreported observation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01889205
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  • 8
    Electronic Resource
    Electronic Resource
    “Skip areas” in hepatic steatosis: A sonographic-angiographic study (1986)
    Springer
    Abdominal imaging 11 (1986), S. 151-157 
    Details
    ISSN: 1432-0509
    Keywords: Hepatic steatosis, angiography ; Hepatic steatosis, sonography ; Liver, ultrasound study
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract “Skip areas” in focal steatosis describes a newly proposed “subsegmental type” of focal steatosis, which differs in both extent and topography from the more classic “lobar or segmental type” of focal steatosis. In the subsegmental type of steatosis, fatty infiltration can be considered homogeneous through-out the liver, with the exception of small flattened portions of less affected parenchyma, called “ skip areas.” These regions are mainly located in the subcapsular areas or along the interlobar fissures or the gallbladder bed. Observations using ultrasound in vivo, as well as on postmortem in vitro angiograms, suggest that both the extent and topography of these skip areas can be explained by local differences in vascular anatomy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035058
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  • 9
    Electronic Resource
    Electronic Resource
    Unilateral moya-moya disease: MRI findings (1989)
    Springer
    Neuroradiology 31 (1989), S. 442-442 
    Details
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343873
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  • 10
    Electronic Resource
    Electronic Resource
    Dorsal defect of the patella: concept of its origin and relationship with bipartite and multipartite patella (1987)
    Springer
    Skeletal radiology 16 (1987), S. 304-311 
    Details
    ISSN: 1432-2161
    Keywords: Patella, radiography ; Patella, abnormalities ; Knee, neoplasms ; Bone cyst ; Cortical defect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In a series of 2286 single radiographic examinations of the knee in 1985, 6 dorsal defects of the patella (DDP) were detected. The diagnosis was made if a round lucent lesion of the dorsal superolateral surface of the patella [9] was found abutting against articular cartilage [10]. In four of our patients, an association with a multipartite patella (MP) was found. Biopsy of one lesion showed dense connective tissue and areas of bone necrosis. In one patient, the pattern of reossification of the lesion could be demonstrated. Our observations provide further evidence that the DDP is a stressinduced anomaly of ossification rather than a posttraumatic subarticular cyst of the patella, a diagnosis sometimes suggested by the clinical context. The initial lesion is probably a traction lesion at the insertion of the vastus lateralis muscle rather than ulceration of articular cartilage. We suggest a possible relationship between dysfunction of the quadriceps mechanism, patellar subluxation, and the genesis of the DDP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00361473
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