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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 2022-2026 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The prevailing approach in density-functional theory makes use of universal functionals, valid for any number of electrons (N). In this article and following the work of Lieb [E. H. Lieb, Int. J. Quantum Chem. 24, 243 (1983)], we argue that the use of N-dependent functionals could be an equally valid approach. Size consistency (dissociation into proper fragments) puts restrictions on the form that N-dependent functionals may adopt. We propose a simple procedure for correcting the size-consistency problem of existing N-dependent functionals that also provides an original way of designing new ones. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 2 (1990), S. 688-699 
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel joint application of holography and photochromic materials to the experimental measurement of velocity gradients in a fluid flow is presented. A short study of some photochromic materials of interest is presented from the point of view of their applicability to experimental fluid mechanics. This includes a spatiotemporal model for the photoinduced conversion reaction which allows for optimization of the experimental conditions. The forced Rayleigh scattering method for measuring velocity gradients using photochromic materials is then briefly described and applied to the measurement of the velocity gradient in a boundary layer. Spatial resolution of 100 μm and gradient resolution of 3 sec−1 are obtained using these techniques.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-0646
    Keywords: 5-fluorouracil ; uracil ; leucovorin ; hepatocellular cancer ; hepatoma ; alpha-fetoprotein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Although UFT 300 mg/m2/day and leucovorin 90 mg/day administered orally in divided doses administered every 8 hours for 28 days repeated every 35 days could be administered safely to patients with advanced hepatomas and good performance status, this combination and schedule has limited activity in treating advanced hepatoma. Background/purpose: Biochemical modulation of 5-fluorouracil has yielded higher response rates in hepatoma when compared to treatment with 5-fluorouracil as a single agent, although the impact on survival has been negligible. This study was conducted to determine the activity and evaluate the toxicity of uracil and tegafur in a 4:1 molar concentration ratio (UFT; Bristol-Myers Squibb, Wallingford, CT) plus oral calcium leucovorin in the treatment of patients with advanced hepatocellular carcinoma (hepatoma). Patients and methods: Sixteen patients with advanced measurable hepatocellular carcinoma were enrolled onto the trial. All patients had a Karnofski performance status ≥ 60%, platelet count ≥ 75,000/μL, total bilirubin ≤ 2.0× institutional upper limit of normal but otherwise normal liver and kidney function profile and bidimensionally measurable disease by CT or ultrasound examination. None of these patients received prior cytotoxic chemotherapy or radiation therapy for advanced disease. Fourteen patients received 300 mg/m2/d UFT plus 90 mg/d leucovorin administered orally in divided daily doses every 8 hours for 28 days repeated every 35 days. Two patients registered for the trial but did not receive study medication. Objective tumor response, the primary purpose of this trial, was evaluated after two courses of therapy. Other end-points included toxicity, time to progression, and overall survival. Results: Fourteen patients were evaluable for response and toxicity, respectively. No complete or partial responders were observed in this trial. Three patients had stable disease lasting 17 to 22 weeks. Toxicity was mild with severe (grade 3 or 4) liver pain, diarrhea, anorexia/nausea, fatigue, dyspnea, hyperbilirubinemia, anemia, and edema seen in 3 (21%), 2 (14%), 3 (21%), 2 (14%), 1 (7%), 1 (7%), 1 (7%) and 1(7%) patients, respectively. The most frequent grade 1 and 2 toxic effects included fever of unknown origin, dyspnea, nausea, vomiting and diarrhea. Conclusion: UFT 300 mg/m2/d plus oral leucovorin 90 mg/d administered for 28 days did not demonstrate antitumor activity against advanced hepatomas. Further treatment using this regimen is not recommended for this disease.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-7527
    Keywords: wheelchair ; mobile robot ; physically disabled ; control ; autonomous guidance ; joystick ; PID controller ; ultrasonic and infrared sensors ; micro-controller ; fuzzy ; speech recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper describes a wheelchair for physically disabled people developed within the UMIDAM Project. A dependent-user recognition voice system and ultrasonic and infrared sensor systems has been integrated in this wheelchair. In this way we have obtained a wheelchair which can be driven with using voice commands and with the possibility of avoiding obstacles and downstairs or hole detection. The wheelchair has also been developed to allow autonomous driving (for example, following walls). The project, in which two prototypes have been produced, has been carried out totally in the Electronics Department of the University of Alcalá (Spain). It has been financed by the ONCE. Electronic system configuration, a sensor system, a mechanical model, control (low level control, control by voice commands), voice recognition and autonomous control are considered. The results of the experiments carried out on the two prototypes are also given.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-0646
    Keywords: gemcitabine ; colorectal cancer ; phase II ; 150 minutes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Abstract Metastatic colorectal cancer is very common in the Western hemisphere and current treatment modalities are not effective. In this study a prolonged (150-minute) infusion of gemcitabine at a constant dose rate of 10 mg/m2/min administered weekly for 3 consecutive weeks repeated every 4 weeks revealed a response rate of 4% (90% CI 〈 1%–18%). There were no complete responses. Treatment with gemcitabine produced moderate to severe toxicity as grade 3–4 neutropenia requiring dose modification was seen in 40% of patients treated. When used in this dose and schedule, gemcitabine does not appear to be effective for patients with metastatic colorectal cancer.
    Type of Medium: Electronic Resource
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