Bibliothek

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    Digitale Medien
    Digitale Medien
    Preparation of platinum/iridium scanning probe microscopy tips (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3059-3067 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We report on the development of an etching setup for use in the preparation of platinum/iridium tips for atomic force microscopy and scanning electrostatic force microscopy as well as scanning tunneling microscopy. The etching process is based on a two step electrochemical procedure. The first step is a coarse alternating current (ac) etching in which the etching is continuous and stops automatically when the lower part of the wire drops off, while the second step is a fine etching made by a number of ac pulses, each of a certain duration and separated by a certain interval of time. When the tip material being etched is platinum/iridium (10%) the influence of the stop phase of the ac current terminating each pulse in the second etching is found to be negligible, while in the case of second etching of tungsten wires it is important to break the pulse in a certain phase to avoid formation of a thick oxide layer. In order to explain the relatively high etching rates observed for the otherwise noble metal platinum we suggest that besides anodic corrosion of the platinum by the electrolyte containing chloride ions, a different etching mechanism causes a substantial increase of the etching rate. This mechanism is based on the formation of oxygen and hydrogen at the platinum/iridium electrode when the potential is above the dissociation potential of water (∼1.23 V) and storage of these products interstitially in the outer layers of the platinum wire. This leads to "microexplosions" that detach fragments of platinum from the wire surface and hereby give rise to "etching" of the wire. In the second etching blunt tips become sharp while tips which are already sharp apparently stay sharp. Therefore, the second etching scheme with pulses separated by pauses is found to be a very important factor for the production of sharp tips. After being etched the tips are ready for use in scanning tunneling microscopes, or they may be bent to form integrated tip/cantilever systems in ordinary commercial atomic force microscopes, being applicable as tapping mode tips and as electrostatic force microscopy tips. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1149891
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    FS04.6
Dose/unit area and time – key factors influencing the elicitation capacity of MCI/MI (2004)
    Oxford, UK; Malden, USA : Blackwell Science Ltd/Inc.
    Contact dermatitis 50 (2004), S. 0 
    Details
    ISSN: 1600-0536
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The objective of the study was to investigate, using the Repeated Open Application Test (ROAT), two key parameters of exposure – allergen concentration (dose/unit area) and time in terms of the elicitation capacity of methylchloroisothiazolinone and methylisothiazolinone (MCI/MI) in MCI/MI-sensitised individuals and to explore the inter-relationship between these two key factors. The study was designed as a double-blind, placebo-controlled, dose-response ROAT preceded by a Diagnostic Patch Test (DPT). 79 patients with a known MCI/M allergy were contacted, 29 were diagnostically patch tested and 25 had their allergy confirmed. 25 MCI/M-allergic subjects and 10 healthy non-allergic control subjects were challenged with 2 ppm of MCI/MI/unit area of skin for 4 weeks. After a wash out period of at least 4 weeks the subjects were challenged with 7.5 ppm of MCI/MI/unit area of skin for 4 weeks. A ROAT with 2 drops of solution twice a day was conducted on the volar aspect of the left and right forearms on a 3 × 3 cm area resulting in dose/unit area of MCI/MI of 0.025 mg/cm2 and 0.095 mg/cm2 for 2 ppm and 7,5 ppm MCI/MI respectively. The elicitation capacity of MCI/MI in MCI/MI sensitive patients is dependent on the exposure dose/unit area and time The results of this study will be a useful addition to the risk assessment information available for MCI/MI. The risk assessment for the use of MCI/MI in rinse off consumer products is unaffected by the results of this study.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.0105-1873.2004.0309ao.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    The Sociology of Labor Markets (1979)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Sociology 5 (1979), S. 351-379 
    Details
    ISSN: 0360-0572
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Sociologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.so.05.080179.002031
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Mathematical Models in Sociology (1978)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Sociology 4 (1978), S. 345-371 
    Details
    ISSN: 0360-0572
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Sociologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.so.04.080178.002021
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Seed Dispersal by Adhesion (1986)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 17 (1986), S. 443-463 
    Details
    ISSN: 0066-4162
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Biologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.es.17.110186.002303
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Women, Family and Class (1994)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Sociology 20 (1994), S. 27-45 
    Details
    ISSN: 0360-0572
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Sociologie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.so.20.080194.000331
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Secondary impingement in the shoulder (2000)
    Copenhagen : Munksgaard International Publishers
    Scandinavian journal of medicine & science in sports 10 (2000), S. 0 
    Details
    ISSN: 1600-0838
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin , Sportwissenschaft
    Notizen: Non-traumatic shoulder pain in the overhead athlete is a diagnostic challenge. In the last decade shoulder arthroscopy and magnetic resonance imaging (MRI) techniques have extended our knowledge. Previously unknown pathologic changes in the glenohumeral joint have been demonstrated and it is recognized that impingement symptoms and instability are often related. Shoulder dysfunction in overhead athletes may be caused by shoulder instability. However, a possible instability in the shoulder is often “silent” and difficult to demonstrate by ordinary tests and has therefore by some been termed “functional instability”. It is now thought that functional instability in the shoulder may lead to a vicious cycle involving microtraumata and attenuation of the capsular complex, and may eventually lead to shoulder pain. Changes in shoulder proprioception, measured by testing kinaesthetic sense and position sense, can be related to different pathologic changes in the shoulder, and sensory motor control may be an important factor for functional stability in the shoulder. MRI and arthroscopical findings in athletes with shoulder pain are changes in the glenoid labrum, the humeral head, the rotator cuff, biceps tendon and the capsular complex. However, these findings often present other clinical entities than impingement and are not always associated with instability. Clinically, there are tests that can objectively distinguish some of the pathological findings. However, we need more exact methods to further improve our clinical diagnoses of the painful shoulder. One of the keys could be an extended knowledge about the pathophysiology behind functional instability. This review focuses on an improved terminology in impingement based on the current knowledge of impingement and instability in the shoulder.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1034/j.1600-0838.2000.010005266.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    The crystal structure of carbonatotetrakis(pyridine)cobalt(III) perchlorate monohydrate (1973)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 29 (1973), S. 113-120 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740873002050
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    Multiple Anomalies occurring in a New-born Spanish Goat following Prenatal Gamma-radiation (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 906-907 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Following a normal gestation period of 150 days, the doe gave birth to a female kid weighing 4.3 lb. Average weight for irradiated single kids in the flock was 5.2 lb. A number of aberrations were immediately apparent in the animal. Functionally the most obvious was the animal's lack of muscular ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/200906b0
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    Many-particle entanglement with Bose–Einstein condensates (2001)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 409 (2001), S. 63-66 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The possibility of creating and manipulating entangled states of systems of many particles is of significant interest for quantum information processing; such a capability could lead to new applications that rely on the basic principles of quantum mechanics. So far, up to four atoms have ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/35051038
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...