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  • 1
    Electronic Resource
    Electronic Resource
    Ab initio calculations of the vibronically averaged hyperfine coupling constants for the 1 2Πu electronic state of CH2+ (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7629-7636 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The results of pure ab initio calculations of the hyperfine coupling constants for the 1 2Πu electronic state for various isotopomers of CH2+ in the energy range between 0 and 20 000 cm−1 are presented. Effects of vibronic and spin–orbit coupling are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463483
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  • 2
    Electronic Resource
    Electronic Resource
    Study of the hyperfine coupling constants (14N and 1H) of the NH2 molecules in the X 2B1 ground state and the A 2A1 excited state (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4526-4535 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The hyperfine coupling constants (hfcc) Aiso and Aij are calculated for the atoms of NH2 in its two lowest-lying electronic states at various molecular geometries by means of the ab initio multireference configuration interaction method. The vibronically averaged values of the hfccs for the K=0 and 1 levels in 14N 1H2 in the energy range up to 20 000 cm−1 are computed. Polarization effects which determine Aiso as well as a simple model to describe the dipolar hfccs are discussed. All results are in excellent agreement with experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462814
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  • 3
    Electronic Resource
    Electronic Resource
    Ab initio calculation of the vibronically averaged values for the hyperfine coupling constants in NH2, NHD, and ND2 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 4996-5006 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibronically averaged values for K=0 and K=1 bending levels in the energy range between 0 and 25 000 cm−1 are computed for the 14N, H, and D atoms in NH2, NHD, and ND2. The pure ab initio electronic potentials, as well as those derived by fitting of experimentally observed band positions are employed. Effects of vibronic coupling and local perturbations of close-lying levels belonging to different electronic states are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463853
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  • 4
    Electronic Resource
    Electronic Resource
    Ab initio investigation of the vibronic structure of the 3p 2Π (Rydberg) state of HCO and DCO (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 3587-3591 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The results of an ab initio investigation of the vibronic structure of the 3p 2Π (Rydberg) state of HCO and DCO are presented. The potential curves obtained by large-scale configuration interaction (CI) calculations are employed. The theoretical results confirm a recent experimental analysis of the Renner–Teller effect in this state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464035
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  • 5
    Electronic Resource
    Electronic Resource
    EXPLORATION OF BURUNDI NICKELIFEROUS LATERITES BY ELECTRICAL METHODS (1981)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 29 (1981), S. 0 
    Details
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The laterites in Burundi, which are formed by weathering of ultrabasic rocks, show a complete profile with the following horizons: canga, the ferruginous crust capping, ferralite, consisting essentially of iron hydroxides, and saprolite, which contains a large quantity of hydrosilicate minerals. Nickel bearing minerals occur in the saprolite and the lower portion of ferralite.Resistivity well-logging and resistivity sounding indicated that the electrical properties of rocks depend upon their composition: Canga and ferralite showed high resistivities of 6,500 Ωm and 800 Ωm, respectively. The resistivity of saprolite was found to be much lower, between 10 Ωm and 20 Ωm. The laterite is underlain by resistive peridotite. The chargeability of saprolite was found to be lower than that of the upper horizons and the bedrock.Electrolytic conductivity of laterite, which depends on the geometry of the deposit, was found to be low, because the laterite contains moisture and ground water, which are highly resistive. The relatively high conductivity of saprolite is caused by nickeliferous hydrosilicates, which exhibit the electrical properties of clay minerals, with an apparent maximum conductivity of 0.25 S/m. The conductivity of saprolite corresponds to a concentration between 30% and 50% of conductive silicate minerals distributed in the pore space of deposit. A nickel enrichment of up to 6% was estimated from the resistivity of the saprolite.Prospecting for laterites by electrical sounding showed that the development of laterite horizons in a nickel deposit correlates with the surface morphology of weathered ultrabasic massif. Thus the method can be used in preliminary exploration of such deposits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2478.1981.tb00405.x
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  • 6
    Electronic Resource
    Electronic Resource
    Ab initio study of the potential energy surfaces of doublet valence and Rydberg states of FCO (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 3973-3980 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Multireference configuration interaction calculations (MRD-CI) were carried out in order to obtain the bending and stretching potential energy curves of several low-lying electronic states of the fluoroformyl radical FCO. The study of interactions between valence and Rydberg states as well as that of the dissociative behavior is included in the investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467515
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  • 7
    Electronic Resource
    Electronic Resource
    Ab initio investigation of the vibrational structure of absorption and emission spectra of FCO (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 3981-3988 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Results of an ab initio study of the vibrational structure of several electronic spectral systems of FCO are presented. An interpretation of hitherto recorded spectra, as well as a prediction of features of yet unobserved electronic transitions is given. The absorption spectra observed in the uv spectral region are ascribed to the transitions involving the first excited states of 2A' and 2A‘ character. The emission spectrum obtained by Toby and Toby [J. Phys. Chem. 85, 4071 (1981)] is assigned to the transition X 2A'←2 2A‘. Reassignment of some observed vibrational bands is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467516
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  • 8
    Electronic Resource
    Electronic Resource
    On a theoretical model for the Renner–Teller effect in tetra-atomic molecules (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 105 (1996), S. 8569-8585 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A model for the ab initio treatment of the Renner–Teller effect in tetra-atomic molecules is elaborated. It is based on the approach developed by Petelin and Kiselev [Int. J. Quantum Chem. 6, 701 (1972)]. Particular attention is paid to Π electronic states. Perturbative formulas are derived for several coupling cases. The model is checked by means of ab initio calculations at various levels of sophistication. Results of computations of various quantities related to the model are presented for the X 2Πu states of B2H+2 and C2H+2. The reliability of the basis assumptions is demonstrated by comparing the results obtained in the framework of the model considered with those of independent ab initio calculations. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.472641
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  • 9
    Electronic Resource
    Electronic Resource
    Immunological disturbances in anaesthetic personnel chronically exposed to high occupational concentrations of nitrous oxide and halothane (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 46 (1991), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Immunological changes in anaesthetic personnel exposed to occupational concentrations of holothane and nitrous oxide 10—60 times greater than the advised maximum were studied during routine work and after 3—4 weeks holiday. Red cell count, haemoglobin concentration and haematocrit decreased during exposure although not significantly, in comparison with a control group, but all had increased significantly after the holidays. Other changes were altered neutrophils and lymphocyte counts. Basophils disappeared from the blood during the exposure. Monocytes were not affected during the exposure, but increased after its cessation. Percentages of CD2 and CD4 lymphocytes increased significantly, but numbers of cells in T lymphocyte subpopulations (total, helper and cytotoxic/supressor lymphocytes) -were not significantly altered. B lymphocytes were most strongly affected: they decreased during working periods and did not recover after holidays. Natural killer (NK) cells, on the other hand, decreased significantly during exposure, but fully recovered during holidays. After stimulation with mitogens, phytohaemaglutin, concanavalin A, and pokeweed, lymphocytes from exposed personnel incorporated significantly more 3H-thymidine than those from control subjects, but stimulation indices did not differ. The natural killer-cell activity, serum Ig concentrations and phagocytosis by granulocytes were not altered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1991.tb09649.x
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  • 10
    Electronic Resource
    Electronic Resource
    Age-dependent haematological disturbances in anaesthetic personnel chronically exposed to high occupational concentrations of halothane and nitrous oxide (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 49 (1994), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Anaesthetic staff chronically exposed to high occupational concentrations of halothane and nitrous oxide were tested for numerous haematological and cellular function parameters at the peak of the working season and after 3 weeks vacation. The analysis of data was performed to compare differences in subjects younger and older than the age of 40 years, respectively when compared with normal controls. The analysis revealed a higher recovery of erythrocyte’count in the blood of older staff, and stronger disturbance of leucocyte formation in younger staff. In contrast, monocytes appeared to be more stable in the younger staff as were the T and B lymphocyte counts. After stimulation with PHA, Con A and PWM mitogens, lymphocytes from the older age group incorporated a significantly higher amount of tritiated thymidine, but stimulation indices did not differ. Natural killer cell numbers appeared equally affected; natural killer cell activity was unaffected, but there was an increase in activity in the younger staff after the vacation. Serum immunoglobulin concentrations tended to be more affected in older individuals at the peak of the working season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1994.tb04347.x
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