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  • 1
    Electronic Resource
    Electronic Resource
    Localization and hopping of magnetoelastic waves in highly magnetostrictive strings with random chain structures (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 5692-5692 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Analogous to the localization of the wave function of an electron in a random potential (Anderson localization), in the macroscopic system of magnetoelastic waves (MEWs) propagating in a highly magnetostrictive string exhibiting the giant ΔE effect, the piling-up of MEWs into a wave-packet in a restricted small region of the string is expected. This wave-packet is subject to hopping in a discontinuous wave by applying a magnetic field due to the change in the local elastic states caused by the ΔE effect. From this expectation, a theoretical analysis was performed focusing on the derivation of localization conditions of MEWs. The analysis was carried out using a one-dimensional string model having high magnetostriction. The string is assumed to be composed of random chains with (1) alloy-type disorder (random weights of masses with equal spacings) and (2) liquid-type disorder (random spacings of masses with equal weights). For the elastic and magnetoelastic constants of the string, the value of Fe78Si10B12 amorphous wire (Unitika) were used in the calculations. No substantial changes in the localization states were not recognized in both modes. The analysis revealed that, when the change of the apparent Young's modulus with magnetic field ΔE is 28%, the localized MEWs are subject to hopping conserving their wave identities (eigenfrequencies and eigenstates). This result in considered to originate from the changes in the disorder conditions to support the localization of MEWs. To confirm the above theoretical prediction experimentally, MEW properties have been measured by using Fe78Si10B12 amorphous wires connecting weights made of leads to form the random chain structure. The localized MEWs are, indeed, observed by detecting the local vibrations of the wires. Theoretical and experimental results will be presented in detail at the conference. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364639
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  • 2
    Electronic Resource
    Electronic Resource
    Development of a fluorescent x-ray source for medical imaging : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1981-1983 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A fluorescent x-ray source for medical imaging, such as K-edge subtraction angiography and monochromatic x-ray CT, has been developed. Using a 6.5 GeV accumulation ring in Tsukuba, fluorescent x rays, which range from about 30 to 70 keV are generated by irradiating several target materials. Measurements have been made of output intensities and energy spectra for different target angles and extraction angles. The intensities of fluorescent x rays at a 30 mA beam current are on the order of 1–3×106 photons/mm2/s at 30 cm from the local spot where the incident beam is collimated to 1 mm2. A phantom which contains three different contrast media (iodine, barium, gadolinium) was used for the K-edge energy subtraction, and element selective CT images were obtained. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145776
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrathin Si buffer layers to improve the exchange bias between Ni–Fe and FeMn layers (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4934-4936 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ni–Fe/FeMn bilayers were deposited by using dual ion beam sputtering apparatus. In order to promote (111) orientation in γ-FeMn layers and to exhibit exchange bias field Hex, Si and/or silicon nitride (Si3N4) layers were deposited as buffer layers. Although silicon nitride (Si3N4) buffer layers did not improve (111) orientation in FeMn layers, as well as in Ni–Fe layers, an amorphous Si buffer layer only 1 nm thick improved (111) orientation in FeMn layers and increased Hex to above 100 Oe. FeMn/Ni–Fe bilayers deposited on Si(0.5 nm)/Si3N4(1 nm) bilayered buffer layer also exhibited high Hex of about 130 Oe. This result implies that the ultrathin a-Si buffer layer was effective in improving (111) orientation in Ni–Fe layers. Very thin Si/Si3N4 bilayers may be applicable as dielectric layers in tunneling magnetoresistive spin valve devices. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370050
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  • 4
    Electronic Resource
    Electronic Resource
    Case report: glomus tumour of the nasal cavity and paranasal sinuses (1998)
    Springer
    Neuroradiology 40 (1998), S. 527-529 
    Details
    ISSN: 1432-1920
    Keywords: Key words Computed tomography ; Glomus tumour ; Nasal cavity ; Sinuses ; paranasal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Glomus tumours are relatively rare in the head and neck. We present a glomus tumour of the nasal cavity and paranasal sinuses in a 55-year-old man and describe the CT appearances of this tumour and its histopathology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050640
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  • 5
    Electronic Resource
    Electronic Resource
    Cerebral vasospasm with subarachnoid haemorrhage from arteriovenous malformations of the brain (1975)
    Springer
    Neuroradiology 8 (1975), S. 201-207 
    Details
    ISSN: 1432-1920
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs présent les résultats d'un examen rétrospectif des notes cliniques et radiologiques de 63 patients avec des malformations cérébrales artérioveneineuses vérifiées. Les patients avec des malformations artérioveineuses de la dure-mère et des malformations avec des caractéristiques angiographiques atypiques ont été exclus de cet étude. De ces 63 patients, 52 avaient des hémorragies sous-arachnoidiennes vérifiées ou suspectes, et 8 patients ont manifesté des signes angiographiques évidents de spasme artériocérébral. Deux de ces patients avaient un anéurysme intracrânien et ont été donc exclus de cet étude. Les autres 6 patients avaient présenté des spasmes entre 2 et 13 jours après l'hémorragie sousarachnoidienne. Tous ces 6 patients ont montré un spasme de la partie terminale de la carotide interne. L'incidence de l'association du spasme et l'hémorragie sous-arachnoidienne dans cet étude n'était pas plus que 12%. La majorité des malformations artérioveineuses se situe à la périphérie ou au centre et il est moins probable que l'hémorragie sous-arachnoidienne atteigne la base du cerveau (où le spasme artériel se produit surtout) par comparaison à l'hémorragie d'un anéurysme du polygon de Willis. Ceci explique probablement la rareté relative du spasme associé aux malformations artérioveineuses cérébrales signalées par d'autres auteurs et confirmées par cet étude.
    Abstract: Zusammenfassung In der vorliegenden Arbeit werden die klinischen und röntgenologischen Daten von 63 Patienten mit gesicherten arterio-venösen Gefäßmißbildungen des Gehirns beschrieben. Von diesen Kranken hatten 52 eine nachgewiesene Subarachnoidalblutung oder es bestand der hochgradige Verdacht auf eine Blutung. Bei insgesamt 8 Patienten lag ein cerebraler arterieller Gefäßspasmus vor. Bei 2 dieser Patienten bestanden Aneurysmen, sie wurden aus der Untersuchungsserie ausgeschieden. Bei den übrigen 6 konnte der Gefäßspasmus am 2. bis 13. Tag nach dem Auftreten der Subarachnoidalblutung beobachtet werden. Die Mehrzahl der arterio-venösen Mißbildungen lag in der Peripherie oder in der Tiefe des Gehirns. Dabei erreichte die Subarachnoidalblutung weniger leicht die basalen Hirnanteile, an denen gewöhnlich ein arterieller Spasmus auftritt.
    Notes: Summary The results of a retrospective review of the clinical and radiological records of 63 patients with proven cerebral arteriovenous malformation are reported. Patients with dural arteriovenous malformations, and malformations with atypical angiographic features were excluded from the study. Of these 63 patients, 52 had a proven or suspected subrachnoid haemorrhage and 8 patients showed angiographic evidence of cerebral arterial spasm. Two of these patients had an associated intracranial aneurysm and were excluded from the study. The other 6 patients were shown to have spasm between two to thirteen days after a subarachnoid haemorrhage. The incidence of vasospasm associated with subarachnoid haemorrhage in this series was at most 12%. The probable explanation for the relative rarity of vasospasm associated with arteriovenous malformations of the brain, reported by other authors and confirmed by this study, is that the majority of these malformations are peripherally or deeply situated and subarachnoid bleeding is less likely to reach the base of the brain where arterial spasm mainly occurs as compared with haemorrhage from an aneurysm arising from the circle of Willis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337652
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  • 6
    Electronic Resource
    Electronic Resource
    Stochastic Simulation of Microseisms Using Theory of Conditional Random Fields (1998)
    Springer
    Pure and applied geophysics 151 (1998), S. 81-99 
    Details
    ISSN: 1420-9136
    Keywords: Key words: Stochastic simulation, stochastic interpolation, microseisms, stationary Gaussian process, conditional random fields, nonparametric test, sign test.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract. —We examine the applicability of conditional stochastic simulation to interpretation of microseisms observed on soft soil sediments at Kushiro, Hokkaido, Japan. The theory of conditional random fields developed by Kameda and Morikawa (1994) is used, which allows one to perform interpolation of a Gaussian stochastic time-space field that is conditioned by realized values of time functions specified at some discrete locations. The applicability is examined by a blind test, that is, by comparing a set of simulated seismograms and recorded ones obtained from three-point array observa tions. A test of fitness was performed by means of the sign test. It is concluded that the method is applicable to interpretation of microseisms, and that the wave field of microseisms can be treated as Gaussian random fields both in time and space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000240050106
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  • 7
    Electronic Resource
    Electronic Resource
    Corrigendum (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 1130-1130 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01949987
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  • 8
    Electronic Resource
    Electronic Resource
    Management of subarachnoid fluid collection in infants based on a long-term follow-up study (1996)
    Springer
    Acta neurochirurgica 138 (1996), S. 179-184 
    Details
    ISSN: 0942-0940
    Keywords: Subarachnoid fluid collection ; subdural fluid collection ; subdural haematoma ; infant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report the natural history and management of subarachnoid fluid collections in infants and their management based on a longterm follow-up study in 20 cases. These subarachnoid fluid collections were resolved spontaneously in 17 of 20 patients and only 3 by surgical intervention at the age of 2. In our 20 patients the natural history of subarachnoid fluid collection in infants was benign unless the patients sustained head trauma. Surgical treatment was performed in the cases where a subarachnoid fluid collection developed into a subdural haematoma. Head trauma may precipitate subdural haematoma in patients with subarachnoid fluid collection. All patients except one who underwent the placement of subdural-peritoneal shunt, attained normal psychomotor development in time. During the follow-up period of 3 to 10 years after resolution of the fluid collection, no patient has had a recurrence once it resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411358
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  • 9
    Electronic Resource
    Electronic Resource
    Lymphocytic hypophysitis presenting with diabetes insipidus: MR findings (1999)
    Springer
    European radiology 9 (1999), S. 1397-1400 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Pituitary gland ; Lymphocytic hypophysitis ; Lymphocytic adenohypophysitis ; Lymphocytic infundibulo-neurohypophysitis ; Diabetes insipidus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. It has been thought that neurohypophysial involvement manifesting as central diabetes insipidus in lymphocytic hypophysitis is rare. The radiological and clinicopathological features of two cases represent a variant of lymphocytic adenohypophysitis and/or lymphocytic infundibulo-neurohypophysitis are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050855
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  • 10
    Electronic Resource
    Electronic Resource
    CT imaging of biliary enteric fistula (1998)
    Springer
    Abdominal imaging 23 (1998), S. 172-176 
    Details
    ISSN: 1432-0509
    Keywords: Key words: CT—Biliary enteric fistula—Pneumobilia—Cholecystoduodenal fistula—Choledochoduodenal fistula—Cholecystocolic fistula.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Background: To define the signs useful for differentiating between gallbladder–enteric fistula (GB-EF) and common bile duct–enteric fistula (CBD-EF) on computed tomography (CT) because the prognosis and management of the two are different. Methods: CT scans in 13 patients with pneumobilia, who had not had surgical biliary–enteric anastomosis and endoscopic sphincterotomy, were reviewed. The presence of fistula itself, the location of air in the biliary system, and the appearance of the gallbladder were assessed. Results: The causes of pneumobilia were GB-EF in seven patients, CBD-EF in three patients, emphysematous cholecystitis (EC) in one patient, gallbladder cancer (GBC) in one patient, and incompetent sphincter of Oddi in one patient. In three of seven GB-EF patients (43%) and in none of the three CBD-EF patients (0%), the fistula itself was detected. Air was detected in the common bile duct in four of seven GB-EF (57%) and in all three CBD-EF (100%) patients, and GBC. In six of seven GB-EF (86%) and in one of three CBD-EF (33%) patients, the gallbladder was contracted. Thus, the location of air and the contraction of gallbladder were useful signs to differentiate GB-EF from CBD-EF. Conclusion: CT can distinguish between GB-EF and CBD-EF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002619900314
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