Bibliothek

X
Suchhistorie löschen
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
    A New Indole Synthesis1 (1965)
    s.l. : American Chemical Society
    The @journal of organic chemistry 30 (1965), S. 2531-2533 
    Details
    ISSN: 1520-6904
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jo01019a007
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Preparation and Schistosomicidal Activity of Some 4-Hydroxymethyl-3-chloroanilines (1967)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 10 (1967), S. 877-880 
    Details
    ISSN: 1520-4804
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jm00317a026
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Ab initio study of hexagonal Fe/Ru multilayers (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 7080-7082 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Calculations of structural and electronic properties of hexagonal Fe/Ru multilayers, as well as of pure Fe and Ru metals, were performed using the spin-polarized density functional technique. Apart from the conventional hexagonal AB stacking of close-packed planes, an AB′ stacking with atoms in a B′ plane shifted over the triangle edges formed by atoms in an A plane was examined in the Fe part of the multilayers. It was concluded that the most stable solution is a ferromagnetic configuration with an AB′ stacking within Fe layers with the axial ratio cFe/aRu=1.47 and with an AB stacking in Ru layers with cRu/aRu=1.60. Interfacial interdiffusion effects and antiferromagnetic order were also investigated in connection with the reported disappearance of a magnetism at the Fe/Ru interfaces. The equilibrium lattice parameters of hexagonal close-packed Fe metal, aFe=2.44 Å, cFe/aFe=1.60, were obtained for a nonmagnetic state. At an only slightly larger lattice constant an antiferromagnetic state appears. For bulk Ru the parameters aRu=2.73 Å, cRu/aRu=1.58 were found for a nonmagnetic phase with the onset of antiferromagnetism beginning at highly dilated interatomic distances. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1358826
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Empirical Scaling of Single Oral Lethal Doses Across Mammalian Species Based on a Large Database (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 18 (1998), S. 0 
    Details
    ISSN: 1539-6924
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Energietechnik
    Notizen: The scaling of administered doses to achieve equal degrees of toxic effect in different species has been relatively poorly examined for noncancer toxicity, either empirically or theoretically. We investigate empirical patterns in the correspondence of single oral dose LD, values across several mammalian species for a large number of chemicals based on data reported in the RTECSQ database maintained by the National Institute for Occupational Safety and Health. We find a good correspondence of LD, values across species when the dose levels are expressed in terms of mgadministered per kg of body mass. Our findings contrast with earlier analyses that support scaling doses by the 3/4-power of body mass to achieve equal subacute toxicity of antineoplastic agents. We suggest that, especially for severe toxicity, single- and repeated-dosing regimes may have different cross-species scaling properties, as they may depend on standing levels of defenses and rate of regeneration of defenses, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1539-6924.1998.tb01117.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Disorder and noncollinear magnetism in permanent-magnet materials (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5051-5055 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report calculations of the noncollinear magnetic structures and of the magnetic anisotropies of YFe12−xMox permanent magnets with the ThMn12 structure, using a novel variant of a spin-polarized tight-binding-linear-muffin-tin-orbital technique allowing for local spin-quantization axes on each site and considering spin–orbit coupling. The ternary YFe12−xMox compounds crystallize in the tetragonal ThMn12 structure which can be stabilized only by the partial substitution of Fe by an early transition metal like Mo. We show that the substitutional disorder leads to canted spin-structures at low Mo content (x∼1) and to spin-glass-like behavior at higher Mo content (x∼3). We also find that the character of the anisotropy changes from uniaxial to planar with higher Mo content. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.361569
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Uniaxial and planar magnetic anisotropy of thin transition-metal films (abstract) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4963-4963 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We present a novel approach to the calculation of the spin structures and magnetic anisotropies in crystals and thin films. Our technique is based on self-consistent real-space recursion calculations on a tight-binding linear muffin-tin orbital (TB LMTO) Hubbard Hamiltonian including spin–orbit coupling and allowing for arbitary orientations of the local spin-quantization axes. It allows one to scan the magnetic energy continuously as a function of the orientation of the magnetic moment and thus to avoid the computational problems that plague other techniques. Applications are presented for bulk iron and for thin Fe overlayers on Cu (111) and Cu (100) substrates. For monolayer coverage, we predict a perpendicular direction of the magnetic moment for Fe/Cu(100) an in-plane orientation of the spins for Fe/Cu(111), with anisotropies of the order of 1–2 meV. For Fe/Cu(100) we present a detailed investigation of the variation of the spin structures and of the change from perpedicular to in-plane anisotropy with increasing thickness of the Fe films. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.361604
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Ab initio local-spin-density study of oscillatory exchange coupling and spin density waves in Fe/Cr multilayers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 5756-5758 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The interlayer exchange coupling and the magnetic structure of bcc (001) Fe/Cr multilayers have been studied using a first-principles self-consistent tight-binding linear-muffin-tin-orbital method in the atomic sphere approximation. A generalized gradient approximation to the exchange correlation potential was used. Antiferromagnetic coupling between neighboring Fe layers is found to be energetically favorable for an even number of monolayers in the Cr spacer, while ferromagnetic coupling is preferred for an odd number of monolayers. Also it is found that for certain Cr thicknesses incommensurate spin density waves with different wavelengths coexist. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.372512
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    Decline of caries prevalence after the cessation of water fluoridation in the former East Germany (2000)
    Copenhagen : Munksgaard International Publishers
    Community dentistry and oral epidemiology 28 (2000), S. 0 
    Details
    ISSN: 1600-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract – In contrast to the anticipated increase in dental caries following the cessation of water fluoridation in the cities Chemnitz (formerly Karl-Marx-Stadt) and Plauen, a significant fall in caries prevalence was observed. This trend corresponded to the national caries decline and appeared to be a new population-wide phenomenon. Additional surveys (N=1017) carried out in the formerly-fluoridated towns of Spremberg (N=9042) and Zittau (N=6232) were carried out in order to support this unexpected epidemiological finding. Pupils from these towns, aged 8/9-, 12/13- and 15/16-years, have been examined repeatedly over the last 20 years using standardised caries-methodological procedures. While the data provided additional support for the established fact of a caries reduction brought about by the fluoridation of drinking water (48 % on average), it has also provided further support for the contention that caries prevalence may continue to fall after the reduction of fluoride concentration in the water supply from about 1 ppm to below 0.2 ppm F. Caries levels for the 12-year-olds of both towns significantly decreased during the years 1993–96, following the cessation of water fluoridation. In Spremberg, DMFT fell from 2.36 to 1.45 (38.5 %) and in Zittau from 2.47 to 1.96 (20.6%). These findings have therefore supported the previously observed change in the caries trend of Chemnitz and Plauen. The mean of 1.81 DMFT for the 12-year-olds, computed from data of the four towns, is the lowest observed in East Germany during the past 40 years. The causes for the changed caries trend were seen on the one hand in improvements in attitudes towards oral health behaviour and, on the other hand, to the broader availabilty and application of preventive measures (F-salt, F-toothpastes, fissure sealants etc.). There is, however, still no definitive explanation for the current pattern and further analysis of future caries trends in the formerly fluoridated towns would therefore seem to be necessary.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1034/j.1600-0528.2000.028005382.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    The carbothermic reduction of protactinium pentoxide and first results on protactinium carbide
    Amsterdam : Elsevier
    Journal of Inorganic and Nuclear Chemistry 31 (1969), S. 2381-2390 
    Details
    ISSN: 0022-1902
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Energietechnik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1016/0022-1902(69)80568-3
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    The mannich reaction-II - Derivatization of aldehydes and ketones using dimethyl(methylene)ammonium salts
    Amsterdam : Elsevier
    Tetrahedron 35 (1979), S. 613-619 
    Details
    ISSN: 0040-4020
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-4020(79)87005-2
    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...