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  • 1
    Online Resource
    Online Resource
    Temperature Dependence of the Zero-Field Splitting of Cr 3+ Ions in CsAl(SO 4 ) 2 ∙12H 2 O
    Canadian Science Publishing ; 1974
    In:  Canadian Journal of Physics Vol. 52, No. 1 ( 1974-01-01), p. 91-92
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 52, No. 1 ( 1974-01-01), p. 91-92
    Abstract: The zero-field splitting of Cr 3+ ions in CsAl(SO 4 ) 2 ∙12H 2 O was studied in the temperature range 4.2 to 300 K. The experimental spectrum is described with a spin Hamiltonian with S = 3/2 and g = 1.975 ± 0.005; the zero-field splitting parameter D changes with temperature having a value of −0.074 ± 0.0003 cm −1 at room temperature and a value of −0.070 ± 0.0003 cm −1 at liquid helium temperature.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p74-012
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1974
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  • 2
    Online Resource
    Online Resource
    Electron paramagnetic resonance experiments with Ti 3+ ions in CsAl(SO 4 ) 2∙ 12H 2 O
    Canadian Science Publishing ; 1968
    In:  Canadian Journal of Physics Vol. 46, No. 1 ( 1968-01-01), p. 59-60
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 46, No. 1 ( 1968-01-01), p. 59-60
    Abstract: Measurements are reported on single crystals of cesium aluminium alum containing Ti 3+ ions in concentrations between 0.05 and 0.5 %.Three nonequivalent complexes are located with the z axis along each of the four cube diagonal directions, that is, there appear to be 12 possible sites for a complex in each unit cell. The effective g factors for the three nonequivalent sets of complexes are shown below:[Formula: see text]The lines due to complex I are asymmetrical and have a width of from 50 to 100 Oe, these lines being similar to those reported for the Ti 3+ complex in corundum. The lines due to complex III are symmetrical and have a width between 150 and 200 Oe.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p68-008
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1968
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  • 3
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    Online Resource
    Enantioselective deprotonation of protected 4-hydroxycyclohexanones
    Canadian Science Publishing ; 1994
    In:  Canadian Journal of Chemistry Vol. 72, No. 7 ( 1994-07-01), p. 1699-1704
    Details
    In: Canadian Journal of Chemistry, Canadian Science Publishing, Vol. 72, No. 7 ( 1994-07-01), p. 1699-1704
    Abstract: A series of derivatives of 4-hydroxycyclohexanone (1a–g) with the hydroxy group protected as a silyl ether (1a, b), ether (1d, g), an acetal (1c), or an ester (1e, f) were deprotonated with chiral, optically pure, lithium amides 3–9. The resulting non-racemic enolates were trapped as enol acetates. The enantioselectivity of deprotonation was up to 74% ee.
    Type of Medium: Online Resource
    ISSN: 0008-4042 , 1480-3291
    URL: Article
    DOI: 10.1139/v94-214
    RVK:
    VA 2870
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 1482256-8
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  • 4
    Online Resource
    Online Resource
    ELECTRON PARAMAGNETIC RESONANCE OF Ti 3+ IONS IN TlAl(SO 4 ) 2 ∙12 H 2 O
    Canadian Science Publishing ; 1966
    In:  Canadian Journal of Physics Vol. 44, No. 10 ( 1966-10-01), p. 2329-2335
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 44, No. 10 ( 1966-10-01), p. 2329-2335
    Abstract: The paramagnetic resonance spectrum of Ti 3+ ions in thallium alum (TlAl(SO 4 ) 2 ∙12 H 2 O) single crystals has been studied in the {100} planes at 4.2 °K with an X-band microwave spectrometer. The spectrum is an analogue of that reported by Dionne for Ti 3+ ions in rubidium alum (RbAl(SO 4 ) 2 ∙12 H 2 O), but differs in that the lines occur at lower values of the magnetic field, and that no superhyperfine splitting was observed. As in the case of Rb alum, the spectrum was explained by considering a model of 12 magnetic complexes, the complexes being related to each other through the symmetry elements of the [Formula: see text] point group of the alum lattice. The three g factors for the spin Hamiltonian with [Formula: see text] were found to be 1.938, 1.834, and 1.790—within an accuracy of ± 0.005. The three different g factors were taken as evidence for a crystal electric field of orthorhombic symmetry. The orbital energy-level splittings required to give the observed g factors were calculated by a degenerate perturbation method. Since the crystals were colorless and since no value for 10 Dq is available in the literature, a unique set of splitting parameters could not be obtained. By giving the spin-orbit coupling constant λ values between 150 and 110 cm −1 , a range of crystal-field energy-level splittings was determined, all of which predict that the cubic splitting 10 Dq is in the ultraviolet region of the frequency spectrum.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p66-190
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1966
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  • 5
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    Online Resource
    Forested wetlands in a protected area and the adjacent working landscape provide complementary biodiversity value based on breeding birds: A case study from Nova Scotia, Canada
    Canadian Science Publishing ; 2023
    In:  FACETS Vol. 8 ( 2023-01-01), p. 1-31
    Details
    In: FACETS, Canadian Science Publishing, Vol. 8 ( 2023-01-01), p. 1-31
    Abstract: Protected areas (PAs) are a key component of most conservation strategies because they are thought to enhance biodiversity value relative to similar habitats in working landscapes. To examine whether PAs in Nova Scotia are functioning to enhance the biodiversity value of the landscapes in which they are embedded, we surveyed breeding bird communities in forested wetlands inside and outside of a large PA during 2018 and 2019. We found significantly higher species richness and diversity at sites in the working landscape relative to those inside the PA. Bird communities from different wetland types inside the PA were distinct from each other and those outside the PA, whereas bird communities at outside sites were homogenized and comprised of more early-successional species. There were numerous species of conservation concern at both inside and outside sites, indicating that both types of sites are playing important conservation roles. Abundances of these key species were driven by a combination of local (e.g., water table depth, herb, and shrub cover) and landscape scale factors (e.g., edge density and human disturbance). The higher abundance of long-distance migrants and insectivores at inside sites suggests PAs are providing critical additional support to key guilds that are in steep decline.
    Type of Medium: Online Resource
    ISSN: 2371-1671
    URL: Article
    DOI: 10.1139/facets-2022-0161
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2852896-7
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  • 6
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    Online Resource
    Coarse woody debris decomposition documented over 65 years on southern Vancouver Island
    Canadian Science Publishing ; 1998
    In:  Canadian Journal of Forest Research Vol. 28, No. 5 ( 1998-05-01), p. 788-793
    Details
    In: Canadian Journal of Forest Research, Canadian Science Publishing, Vol. 28, No. 5 ( 1998-05-01), p. 788-793
    Abstract: In 1929-1930, Stig Schenström and J.D. Curtis established an experiment to study thinning dynamics of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) on southern Vancouver Island, British Columbia. As a subcomponent of the experiment, the coarse woody debris (CWD) from the previous stand were mapped and the decay condition classified on five permanent plots. These scaled drawings and classifications were updated in 1945-1947 and 1995-1996. This unique 65-year period of CWD observation confirms that observations of CWD volume loss on Vancouver Island are similar to elsewhere in the Pacific Northwest. The simple exponential decay rate constant was 0.022 ·year -1 based on volume of primarily Douglas-fir on the five plots. The decay rate constant by large-end diameter was 0.067 ·year -1 for logs 〈 = 20 cm, 0.056 ·year -1 for 21-40 cm, 0.021 ·year -1 for 41-80 cm, and 0.012 ·year -1 for logs 〉 80 cm.
    Type of Medium: Online Resource
    ISSN: 0045-5067 , 1208-6037
    URL: Article
    DOI: 10.1139/x98-047
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1998
    detail.hit.zdb_id: 1473096-0
    SSG: 23
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    The magnetic susceptibility of CsTi(SO 4 )2 ∙ 12H 2 O
    Canadian Science Publishing ; 1970
    In:  Canadian Journal of Physics Vol. 48, No. 7 ( 1970-04-01), p. 814-818
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 48, No. 7 ( 1970-04-01), p. 814-818
    Abstract: The magnetic susceptibility of CsTi(SO 4 ) 2∙ 12H 2 O (CsTi alum) was measured with a Foner magnetometer in the temperature range 4.2 to 300 °K. Emphasis was placed on the liquid-helium to liquid-nitrogen temperature range, since complete measurements for this temperature region have not been reported previously.The experimental results were interpreted with an expression derived by Kamimura for the effective moment of Ti 3+ ions as a function of temperature in a crystalline electric field of trigonal or tetragonal symmetry. A best fit to the experimental data was obtained with values of [Formula: see text] and λ = 25.2 ± 5.0 cm −1 . These values indicate the presence of an excited energy state approximately 30 cm −1 above the ground state; in addition there is a substantial reduction in the spin–orbit coupling factor from the free-ion value.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p70-103
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1970
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  • 8
    Online Resource
    Online Resource
    Using the nitro group to induce π-stacking in terthiophenes
    Canadian Science Publishing ; 2010
    In:  Canadian Journal of Chemistry Vol. 88, No. 4 ( 2010-04), p. 309-317
    Details
    In: Canadian Journal of Chemistry, Canadian Science Publishing, Vol. 88, No. 4 ( 2010-04), p. 309-317
    Abstract: A new synthetic route to mononitrated oligothiophenes is described, as well as the preparation of halogenated derivatives (Br, I) thereof. An unusual deep red colour is observed and explained, with the aid of DFT calculations, as arising from a significant quinoidal contribution to the molecular structure. The crystal structures of two compounds, H(C 4 H 2 S) 3 NO 2 and Br(C 4 H 2 S) 3 NO 2 , are presented. Both compounds have planar sheets held together by intermolecular short contacts (hydrogen bonds and, for the latter, NO 2 ···Br interactions); the sheets do not directly superimpose, so the effect of the π-stacking is not maximized. Solid-state fluorescence and extended-Hückel band-structure calculations are also presented for these materials.
    Type of Medium: Online Resource
    ISSN: 0008-4042 , 1480-3291
    URL: Article
    DOI: 10.1139/V09-165
    RVK:
    VA 2870
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2010
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  • 9
    Online Resource
    Online Resource
    Electron Paramagnetic Resonance of Ti 3+ Ions in KAl(SO 4 ) 2 ∙12H 2 O
    Canadian Science Publishing ; 1975
    In:  Canadian Journal of Physics Vol. 53, No. 8 ( 1975-04-15), p. 841-842
    Details
    In: Canadian Journal of Physics, Canadian Science Publishing, Vol. 53, No. 8 ( 1975-04-15), p. 841-842
    Abstract: The paramagnetic resonance spectrum of Ti 3+ ions in potassium alum (KAl(SO 4 ) 2 ∙12H 2 O) single crystals has been studied in the {100} planes at 4.2 K with an X band microwave spectrometer. The spectrum is an analogue of that reported by Dionne for Ti 3+ ions in rubidium alum (RbAl(SO 4 ) 2 ∙12H 2 O) and by MacKinnon and Dionne for Ti 3+ ions in the thallium alum (TlAl(SO 4 ) 2 ∙12H 2 O). The spectrum was explained with a model of 12 magnetic complexes, the complexes being related to each other through the symmetry elements of the [Formula: see text] point group of the alum lattice. The three g factors for the spin Hamiltonian with S = 1/2 were found to be 1.979, 1.898, and 1.828, with an accuracy of ±0.005.
    Type of Medium: Online Resource
    ISSN: 0008-4204 , 1208-6045
    URL: Article
    DOI: 10.1139/p75-102
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 1975
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  • 10
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    Online Resource
    Relative conservation value of Nova Scotia’s forests: forested wetlands as avian diversity hotspots
    Canadian Science Publishing ; 2020
    In:  Canadian Journal of Forest Research Vol. 50, No. 12 ( 2020-12), p. 1307-1322
    Details
    In: Canadian Journal of Forest Research, Canadian Science Publishing, Vol. 50, No. 12 ( 2020-12), p. 1307-1322
    Abstract: Nova Scotia’s forested landscapes are degraded and under stress. As the province moves toward an ecological forestry management approach, land managers need more complete information about the relative biodiversity value of various habitats in landscapes that they manage to fully assess conservation consequences of different management options. To begin assessing the relative conservation value of different forest types, we surveyed bird communities in 18 forested wetlands (wooded bogs, tall shrub swamps, and treed swamps), mature upland forest stands, and regenerating upland forest stands in western Nova Scotia during the breeding season in 2017 and 2018. There were distinct differences among the bird communities in each forest type. Bird species diversity, overall abundance, and abundance of several guilds and species of conservation concern were higher in forested wetlands than in mature and regenerating upland forests. Bogs and shrub swamps had the highest number of species with strong habitat affinities, but treed swamps and mature sites had unique suites of strongly associated species and guilds — several of conservation concern. Regenerating sites were occupied mainly by forest-edge species and conservation value was low. Our study highlights the importance of forested wetlands to bird conservation and supports the idea that forested wetlands are avian diversity hotspots.
    Type of Medium: Online Resource
    ISSN: 0045-5067 , 1208-6037
    URL: Article
    DOI: 10.1139/cjfr-2020-0101
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 1473096-0
    SSG: 23
    SSG: 12
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