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  • 1
    Electronic Resource
    Electronic Resource
    A secondary-ion-mass spectrometry study of magnesium diffusion in lithium niobate (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7552-7558 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A detailed study of magnesium indiffusion in lithium niobate (LiNbO3) crystal is presented. The aim of the work was to obtain a comprehensive understanding of the diffusion process as a function of film thickness, temperature, diffusion time, crystal cut-direction. The secondary-ion-mass spectrometry technique was employed to obtain magnesium concentration depth profiles. Our results show that the strongest factor that controls the diffusion process is the temperature. A noticeable increase of the diffusion coefficient is observed with increasing temperature. The diffusion time has a small effect on the diffusion coefficient, but if the former is less than a certain value, the deposited MgO film does not diffuse completely. On the other hand, if it is quite long it will enter into the annealing regime. Diffusion parameters to realize buried waveguides (which reduce the coupling loss between single-mode fibers and diffused waveguides) have also been derived. The present studies could be important in consideration of the synthesis of LiNbO3 optical devices with improved optical qualities. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357988
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  • 2
    Electronic Resource
    Electronic Resource
    Monte Carlo computer simulation of small clusters of methane, ethane, and their mixture (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 1593-1599 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monte Carlo simulation results for small clusters of ethane, methane and methane–ethane equimolar mixture are reported. The radial profiles of local density, energy, electric potential and normal component of Irving–Kirkwood pressure tensor were calculated. The local orientational distribution of the molecules of ethane was considered. It was shown that in the surface layer of small drops diatomic molecules prefer to align parallel to the surface, and the fraction of such molecules increases with the decrease of the droplet size. The surface potential and the surface tension were estimated. The values of the surface potential of clusters of ethane were found to be in good agreement with the conclusion of the modern theory about a quadrupolar contribution to the surface potential. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473280
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  • 3
    Electronic Resource
    Electronic Resource
    Monte Carlo Simulations of the Laplace Pressure Dependence on the Curvature of the Convex Meniscus in Thin Unwetted Capillaries (1994)
    s.l. : American Chemical Society
    Langmuir 10 (1994), S. 1837-1840 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00018a036
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  • 4
    Electronic Resource
    Electronic Resource
    Ribonucleic acid precursors are associated with the chick oviduct nuclear matrix (1982)
    s.l. : American Chemical Society
    Biochemistry 21 (1982), S. 4945-4953 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00263a018
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  • 5
    Electronic Resource
    Electronic Resource
    Method for studying the electro-optic effect of isotropic crystals: Stokes–Mueller analysis of the method—experimental results (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3206-3208 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new method for studying the linear electro-optic effect of isotropic crystals is described. Alternating voltage of low frequency is applied to the crystal, placed between a polarizer and analyzer. The direct and the alternating signals are measured at different positions of the analyzer. A Stokes–Mueller analysis of the method is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144329
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  • 6
    Electronic Resource
    Electronic Resource
    Chemical and compositional changes induced by N+ implantation in amorphous SiC films (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2013-2020 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of 30 keV N+ implantation in amorphous silicon carbide films deposited on silicon substrates by rf sputtering over a fluence range of 1×1016–2×1017 ions cm−2, are studied by means of x-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES), and infrared (IR) absorption techniques. The ion-induced modifications of these films have been investigated on the basis of the chemical state evolution of Si, C, and N (using XPS and AES) and on the basis of the vibrational features of the films components (using IR absorption). The results show that implanted N bonds Si selectively, substituting the C atoms in the silicon carbide, and the C substitution by N results in a composite layer of carbonitrides and free C. An ion-induced C transport has also been observed and correlations are established between the formation of silicon carbonitrides and the dynamical behavior of the C in the implanted layer. The latter appears as a superposition of (a) a chemically induced atomic redistribution, required by local stoichiometry and space-filling possibilities in an amorphous network, and (b) a radiation-induced redistribution, a mechanism that is prevailing at low-fluence implantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354764
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  • 7
    Electronic Resource
    Electronic Resource
    Quadrant analysis in a heated-wall supersonic boundary layer (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 4031-4041 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Quadrant analysis was performed with instantaneous velocities measured by laser Doppler velocimetry in a zero pressure gradient supersonic turbulent boundary layer on an adiabatic or heated plate. The distributions obtained were close to those for subsonic flows, and were not modified by the wall heating. Moreover, this heating made it possible to extend the analysis to a part of the buffer layer that is characteristic of the turbulence process (y+∼15). This led to a differentiation between the effects of Reynolds and Mach numbers in the various regions of the boundary layer. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868392
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  • 8
    Electronic Resource
    Electronic Resource
    Physiologic Measures of Kangaroo Versus Incubator Care in a Tertiary-Level Nursery (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of obstetric, gynecologic and neonatal nursing 24 (1995), S. 0 
    Details
    ISSN: 1552-6909
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective: To determine the safety and feasibility of kangaroo care in a tertiary-level nursery as defined by apnea, bradycardia, and oxygen desaturation.Design: Prospective, long-term, repeated measures with a convenience sample.Setting: A 20-bed, tertiary-level nursery with approximately 400 admissions a year.Participants: Eight mother-infant pairs.Interventions: Researchers compared incubator care with kangaroo care for 4 hours a day, 6 days a week, for 3 weeks. Physiologic variables were monitored daily and recorded continuously on a polygraph for 8 hours each week.Main outcome measures: Amount of apnea, bradycardia, and oxygen desaturation.Secondary outcome measures: Heart rate, respiratory rate, percent sleep time, and skin temperature.Results: Apnea, bradycardia, oxygen saturation, heart rate, and respiratory rate were similar during both kangaroo (K) and incubator (I) care. The infants experienced a lower percent (mean ± standard deviation, K versus I) of total sleep (47 ± 5 versus 64 ± 19, p 〈 .003) during kangaroo care. The infants' mean ± standard deviation temperature during the kangaroo care (36.5°C ± 0.64°C) was lower (p 〈 .03) than that of the control periods before (363°C 0.27°C) or after (36.7°C ± 0.26°c). Percent sleep time and skin temperature were slightly lower during kangaroo care, but the differences were not clinically significant.Conclusion: Kangaroo care is safe and feasible for selected mothers and infants in a tertiary-level nursery.Apnea, bradycardia, oxygen saturation, heart rate, and respiratory rate were similar during both kangaroo and incubator care. The infants in the study slept less during kangaroo care, but there were no differences in the percent of quiet sleep. Infants' mean temperatures during kangaroo care were lower than they were in the before and after control periods, but they were within normal limits. These differences were not thought to be clinically significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1552-6909.1995.tb02466.x
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  • 9
    Electronic Resource
    Electronic Resource
    Autonomic Tone in Patients with Supraventricular Arrhythmia Associated with Mitral Valve Prolapse in Young Men (2003)
    350 Main Street , Malden , MA 02148-5018 , USA . : Blackwell Futura Publishing, Inc.
    Pacing and clinical electrophysiology 26 (2003), S. 0 
    Details
    ISSN: 1540-8159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: TERECHTCHENKO, L., et al.: Autonomic Tone in Patients with Supraventricular Arrhythmia Associated with Mitral Valve Prolapse in Young Men. This study examined the relation between autonomic tone and the frequency and duration of supraventricular arrhythmias (SVA) in 44 men (mean age 17 ± 5 years) with mitral valve prolapse (MVP), confirmed by echocardiography. Ambulatory and short-term electrocardiograms (ECG) were recorded, and transesophageal pacing was performed. Frequency domain heart rate variability (HRV) indices were obtained from short-term ECG recordings at rest and during postural stress. Results: In 14 patients, the index of parasympathetic activity was significantly higher ( 2.1 ± 0,01 vs -1.5 ± 0.01, P 〈 0.01 ), and associated with a high incidence of vagally-mediated SVA. The frequency of SV premature beats in patients with parasympathetic prevalence was 58 ± 86/hour versus 10 ± 27/hour in patients with sympathetic prevalence (P 〈 0.05). In 30 patients with high sympathetic activity, the index of sympathetic tone was significantly higher (3.1 ± 0.01vs0.5 ± 0.01) and the high frequency/low frequency ratio significantly lower (0.294 ± 0.03vs0.581 ± 0.02, P 〈 0.05), though the incidence of SVA was significantly lower and duration shorter. The algorithm allowed the noninvasive quantitative assessment of autonomic activity and mechanism behind the development of SVA, which may help in the choice of treatment. (PACE 2003; 26[Pt. II]:444–446)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-9592.2003.00067.x
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  • 10
    Electronic Resource
    Electronic Resource
    CLIMATE, SNOW COVER, GLACIERS, AND RUNOFF IN THE TIEN SHAN, CENTRAL ASIA (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 31 (1995), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The Pica Shan, a mountainous region located on the northern periphery of central Asia, has a wide range of climatic and hydrological conditions. On the basis of long term data from 348 meteorological and glaciological stations, the annual distribution of precipitation in different regions and elevational zones of the Tien Shan was calculated. Major climatic features are the entrance of moisture during spring-summer, small winter precipitation, decrease of precipitation towards the east and the center of the mountains or with distance up valleys, and increase of precipitation with altitude up to crest-lines of ranges. Annual total evaporation from snow can be 50–60 mm per year, reaching 30 percent of snow accumulation.Four main groups of rivers were identified: rivers with mainly snow nourishment, rivers with mainly glacial nourishment, rivers with mainly rain nourishment, and rivers with mainly ground water nourishment. Coefficient of runoff variation in Tien Shan's rivers is about 0.20, and coefficient of glacial runoff variation is about 0.15. Glacial runoff is 15–20 percent of the total volume of river runoff.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1995.tb03426.x
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