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  • 1995-1999  (5)
  • 1970-1974
  • 1905-1909
  • 1999  (5)
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 1611-1620 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used transmission electron microscopy to study magnetization processes in Co/Cu multilayers with the Cu spacer layer thickness close to 9 Å. The films show giant magnetoresistance (GMR) values (approximate)25%, saturation fields of 1–2 kOe, and very little magnetoresistive hysteresis; they are of interest as position sensors. While the Cu thickness was chosen to correspond to the first antiferromagnetic maximum, magnetic images taken throughout a magnetization cycle attest to the fact that the antiferromagnetic coupling is far from complete. Detailed analysis of image sequences and the corresponding low angle diffraction patterns suggests that the coupling is dominated by a biquadratic component. This is consistent with the relatively low value of GMR. Furthermore, the well-defined and relatively simple domain processes which are observed over the low field regime (±50 Oe) explain why little hysteresis is observed. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Heat and mass transfer 35 (1999), S. 479-485 
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The paper gives a brief description of some of the better understood aspects of condensation heat transfer and includes discussion of the liquid-vapour interface, natural and forced convection laminar film condensation and dropwise condensation.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 143 (1999), S. 339-346 
    ISSN: 1432-2072
    Keywords: Key words Nicotine ; Smoking ; Naltrexone ; Opiates ; Mechanism ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Rationale: The role of endogenous opiate systems in cigarette smoking remains unclear. In laboratory animals, opiate antagonists block many of the effects of nicotine, but in humans they do not consistently alter smoking behavior. Objective: This study explored the effects of naltrexone, alone and in combination with nicotine, on smoking behavior. Methods: In a double-blind, double-dummy, within-subjects design, 19 regular smokers received four treatments of 1 week duration: naltrexone tablet (50 mg) plus placebo skin patch, placebo tablet plus nicotine skin patch (21 mg/24 h), naltrexone tablet plus nicotine skin patch, and placebo tablet plus placebo skin patch. During each treatment, subjects rated their responses to nicotine-containing and denicotinized cigarettes in the laboratory, and to their own brand of cigarette smoked ad libitum outside the laboratory. Results: Pretreatment with the nicotine patch attenuated smoking-induced decreases in craving, negative affect, and rates of ad lib smoking, and potentiated the aversiveness of a cigarette. Naltrexone reversed these effects of the nicotine patch, and produced negative effects on mood. Conclusions: The blockade of nicotine’s effects by naltrexone supports a role for opioid mechanisms in cigarette smoking.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-2218
    Keywords: Key words: Anastomotic leakage — Laparoscopic colorectal surgery — Multicenter study
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: We report on a prospective observational multicenter study of more than 1,000 consecutive patients undergoing laparoscopic colorectal procedures. The aim of the current study was to investigate the safety of laparoscopic colorectal surgery as reflected by the anastomotic insufficiency rates in the various sections of the bowel, and to compare these rates with those of open colorectal surgery. Methods: The study was begun on August 1, 1995. Twenty-four centers in Germany, Austria, and Switzerland participated in this prospective multicenter study. All patients undergoing laparoscopic colorectal surgery were included in the study. No selection criteria were applied, which means that every operation begun as a laparoscopic procedure was included. Data on patient demographics, surgical indications, surgical course, and patient outcome were recorded prospectively in a computer database. All data were rendered anonymous. Results: Between August 1995 and February 1998, the 24 participating centers treated 1,143 patients (male/female ratio, 1:1.36; mean age, 60.7 years). In all, 626 operations were performed for benign indications and 517 for cancer. Most procedures involved the sigmoid colon and rectum (80.9%). An anastomosis was performed in 83% of the operations. Most of the anastomoses were laparoscopically assisted using the stapling technique. We observed an overall leakage rate of 4.25% (colon 2.9%; rectum 12.7%), and surgical reintervention was required in 1% of the cases. The rate of conversion to open surgery was 5.6%. Intraoperative complications occurred in 5.9%, and reoperation was necessary in 4.1% of the cases. The overall morbidity rate was 22.3%, and the 30-day mortality rate was 1.57%. Conclusions: The feasibility and safety of the laparoscopic colorectal approach is demonstrated clearly. The current study shows that the laparoscopic or laparoscopically assisted approach to colorectal surgery is not associated with a higher risk of anastomotic leaks. Morbidity and mortality rates with this method approximate those seen with conventional colorectal surgery.
    Type of Medium: Electronic Resource
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