Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1055-1058 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new excitation/detection scheme for Fourier-transform–ion-cyclotron-resonance (FT-ICR) studies is described. The ions are created in the center of a hyperbolic Penning trap and excited to a large magnetron radius. Parametric-mode excitation is used to drive the cyclotron motion. The ions are detected in the conventional dipole-mode detection scheme by use of a segmented ring electrode. Since the resonance frequencies of excitation (ν+−ν−) and detection (ν+, the reduced cyclotron frequency) differ by the magnetron frequency (ν−), this method allows the simultaneous excitation and detection of the ion motion.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 4902-4910 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A Penning trap system has been set up for storing and investigating cluster ions over time ranges from microseconds up to minutes. This enables studies of cluster reactions with extremely low cross sections and the observation of their time dependence in a new regime. The ions are created externally by laser vaporization, cooled by adiabatic expansion of a supersonic beam, and injected into the Penning trap. Detection of reaction products is achieved by combining the advantages of two complementary approaches, viz. the high resolution of Fourier transform mass spectrometry and the high sensitivity of single-ion counting with a time-of-flight mass spectrometer. The performance of the apparatus is illustrated by results of recent cluster experiments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Mass Spectrometry and Ion Processes 132 (1994), S. 181-191 
    ISSN: 0168-1176
    Keywords: Accumulation ; ICR ; Penning trap ; Quadrupole excitation ; SQUEACE
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Mass Spectrometry and Ion Processes 98 (1990), S. 25-33 
    ISSN: 0168-1176
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 1433-0385
    Keywords: Key words: Computer based training ; Fracture of the distal radius ; Surgical education. ; Schlüsselwörter: Computer-basiertes Training ; distale Radiusfraktur ; chirurgische Aus- und Weiterbildung.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Computer-basiertes Training (CBT) umfaßt Programme, die den Lehrstoff eines bestimmten Gebietes vermitteln und verschiedene Möglichkeiten anbieten, das auf diese Weise gewonnene Wissen objektiv zu überprüfen. Der Einsatz von Multimediakomponenten (MMK) wie Text, Graphik, Animation, Ton, Diashow, Video und Quiz kann zu einer effizienten Wissensvermittlung führen. Ziel dieser Arbeit war die eigene Entwicklung und Evaluierung eines CBT-Programmes. Mittels SuperCard wurde ein Modul für die distale Radiusfraktur (DRF) entwickelt. Das Modul beinhaltet ausführliche klinische Informationen. Einen Bezug zur Praxis vermitteln anschauliche Animationen und Videoclips. Zur Evaluierung wurden Studenten im 3. klinischen Semester (n = 103) mittels eines Fragebogens getestet, die sich mit dem Modul für mindestens 90 min auseinandergesetzt hatten. Als Kontrollgruppe dienten Studenten (n = 47), bei denen in einer Vorlesung über 90 min das Thema der DRF bearbeitet wurde. In allen untersuchten Kriterien (Übersichtlichkeit, Detailliertheit, Präsentation des Lernstoffes, Verständlichkeit, Lernmotivation, zeitsparende Vermittlung und Gedächtnishaftung) war CBT der Vorlesung um 15–20 % überlegen. Obwohl 87 % der Nutzer angaben, daß sie nur geringe Computerkenntnisse besitzen, waren 100 % der Meinung, daß der Einsatz von CBT-Systemen im Unterricht sinnvoll ist. Solche Programme sollten nach Meinung der Befragten für Prüfungsvorbereitung/Selbststudium (90 %) oder als Ergänzung zu Vorlesungen (40 %) in Zukunft angeboten werden. Aufgrund der Untersuchung kann festgestellt werden, daß CBT-Module als Lehr- und Lernsystem konventionellen Methoden überlegen scheinen und gut akzeptiert werden. Daher wird empfohlen, CBT-Programme zur Vermittlung einer faktualen Wissensbasis in die Aus- und Weiterbildung zu integrieren.
    Notes: Summary. Computer-based training (CBT) programs teach the material of a specific field and at the same time offer various ways of objectively checking the knowledge gained. The interactive use of multimedia components, such as text, graphics, animation, sound, digital slide shows, videos and quizzes, facilitates the learning process. The aim of this study was the development and evaluation of a CBT program for use by surgeons teaching students. Using SuperCard, a teaching module for distal radius fracture (DRF) was developed, containing detailed clinical information. Video clips and vivid animation combine theoretical knowledge with practical experience. Fourth-year medical students (n = 103) were tested after using the module for 90 min. Other students (n = 47) served as the control group. In a 90-min lecture, DRF was discussed. In all evaluated criteria (distinctness, detailed description, presentation of materials, structure, motivation to learn, time saved while learning and memory retention), CBT gained 15–20 % better scores than the lecture. Although 87 % of the students stated that their experience with computers was limited or insufficient, 100 % found the use of CBT systems helpful in student teaching. Most of them suggested the use of such programs as a exam preparation/self study method (90 %) or as a supplement to a lecture (40 %). Based on these evaluations, it is clear that CBT modules are an appropriate future teaching and learning system that will be well accepted. In conclusion, CBT programs should be integrated into medical education as a valuable supplement. With this aim, CBT systems should be developed and used at universities as an information system for the surgical residency program.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The collision-induced dissociation of positively charged gold clusters (2-23 atoms) stored in a Penning trap has been studied. After collisions with rare gases, excited clusters predominantly decay by emission of one or two atoms. The loss of two atoms occurs most probably through the emission of a dimer rather than by a sequential evaporation. The minimum kinetic energies of clusters required to induce dissociation exhibit a pronounced odd-even effect. Clusters with an even number of delocalized electrons are more stable than those with an odd number.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1434-6079
    Keywords: 07.75. + h ; 35.10.Bg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Doublet mass measurements of the isobars28Si3 and12C7 are performed by use of a Penning trap mass spectrometer and the Fourier transform ion cyclotron resonance (FT-ICR). The carbon and silicon cluster ions are produced by laser ablation. Results of these preliminary measurements are presented.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 1434-6079
    Keywords: 36.40.+d ; 34.50.−s ; 35.20.Gs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stability of gold cluster ions Au n + (2≦n≦23) has been investigated via collision induced dissociation in a Penning trap. Threshold energies and dissociation channels have been determined. The cluster stability exhibits a pronounced odd — even alternation: Clusters with an odd number of atoms,n, are more stable than the even-numbered ones. Enhanced stabilities are found for Au 3 + , Au 9 + , and Au 19 + in accordance with the Clemenger-Nilsson and the deformed jellium model of delocalized valence electrons. Excited odd cluster ions withn≦15 predominantly decay by evaporation of dimers; all others decay by monomer evaporation. From the dissociation channels estimates of the binding energies are deduced.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...