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  • 11
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    The Best-Laid Schemes: An Analysis of Discrepancies Between Migration Intentions and Behavior (1985)
    New York : Periodicals Archive Online (PAO)
    Population and environment. 8:1/2 (1985:Spring-1986:Summer) 63 
    Details
    ISSN: 0199-0039
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Sociology
    Notes: Special Issue on Migration Intentions and Behavior: Third World Perspectives
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:q535-1985-008-01-000004
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  • 12
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    HACKENBERG and MAGALIT, "Demographic Responses to Development: Sources of Declining Fertility in the Philippines" (Book Review) (1986)
    Ann Arbor, Mich., etc., : Periodicals Archive Online (PAO)
    Journal of Asian Studies. 45:4 (1986:Aug.) 905 
    Details
    ISSN: 0021-9118
    Topics: Political Science , Economics
    Description / Table of Contents: "Southeast Asia"
    Notes: Book Reviews
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:1113-1986-045-04-000084
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  • 13
    Electronic Resource
    Electronic Resource
    Finite element studies of the impact-echo response of plates containing thin layers and voids (1990)
    Springer
    Journal of nondestructive evaluation 9 (1990), S. 27-47 
    Details
    ISSN: 1573-4862
    Keywords: Finite element ; nondestructive evaluation ; stress wave propagation ; layered plates ; flaws ; concrete
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Quantitative nondestructive evaluation based on the use of transient stress waves generated by point impact is hindered by the fact that the governing partial differential equations admit closed-form solutions for only the most trivial cases, an infinite half-space and an infinite plate. In previous studies carried out by the authors, the finite element method has been shown to provide useful numerical solutions for a variety of cases involving bounded solids containing flaws. Numerical results have been verified with carefully controlled experiments. Currently, the method is being used to establish the basis for a new nondestructive evaluation technique for civil engineering structures. This technique is called impact-echo, and it is based on the use of low frequency, transient stress waves generated by elastic point impact. In this paper, the impact-echo response of plates containing thin layers is studied using finite element models. The purpose of these studies was to determine the applicability of using the method for detecting voids in layered civil engineering structures. Results of the numerical studies show that it is feasible to use the impact-echo method for this application.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566980
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  • 14
    Electronic Resource
    Electronic Resource
    The best-laid schemes: An analysis of discrepancies between migration intentions and behavior (1985)
    Springer
    Population and environment 8 (1985), S. 63-77 
    Details
    ISSN: 1573-7810
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Sociology
    Notes: Abstract A longitudinal survey approach is used in a largely rural area in the Philippines to examine consistency between migration intentions and subsequent migration behavior. Inconsistencies in movement behavior, the timing of a move, and the destination are analyzed. Discrepancies between intentions and behavior are explained in terms of unanticipated constraints and facilitators as well as changes in the conditions that precipitated the migration intention in the first place. Intended international movers who did not actually move in a 2-1/2 year period were thwarted mainly by legal hurdles that could not be overcome. Intended internal migrants who did not actually move remained in their origin area primarily because of changes in job opportunities or family relationships. Methodological and theoretical implications of the findings are discussed. The best laid schemes o' Mice an' Men Gang aft agley, An' la'e us nought but grief an' pain, For promis'd joy! ⋯ we must bear in mind the distinction between direct and facilitating factors involved in migration processes⋯ . migration analysis should consider some factors that facilitate or impede migration rather than determine migration directly (Goldscheider, 1971:38).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01263017
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  • 15
    Electronic Resource
    Electronic Resource
    Characterization of the Cadmium-Binding Capacity of Chlorella vulgaris (1998)
    Springer
    Bulletin of environmental contamination and toxicology 60 (1998), S. 433-440 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900644
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  • 16
    Electronic Resource
    Electronic Resource
    Kinetics of wetting of a compacted powder by aqueous solutions of surface active agents (1976)
    Springer
    Colloid & polymer science 254 (1976), S. 108-113 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Der Kapillaraufstieg wässeriger Lösungen anionischer Netzmittel in gepreßtem Pulver eines organischen Chrom-Komplexes wird durch die erweiterte Gleichung vonWashburn-Rideal wiedergegeben, in der die Parameter der porösen Struktur mit einbezogen werden. Bei der Porosität ∼ 1 —π/6, die der lockersten Anordnung gleichförmiger Kugeln entspricht, wird die Eindringgeschwindigkeit meistens durch die an der sich bewegenden Dreiphasengrenze wirkenden Grenzflächenspannungen bestimmt, wenn keine Peptisation eintritt.
    Notes: Summary The capillary rise of aqueous solutions of anionic wetting agents into a compacted powder of an organic chromium complex is discussed on the basis of the Washburn-Rideal equation expanded to account for the porous structure parameters. At the porosity ∼ 1 —π/6, corresponding to the loosest packing of monodisperse spheres the penetration rate is found to be mostly governed by the effective tensions operative at the moving three phase line of contact in case no deflocculation intervenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01526747
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  • 17
    Electronic Resource
    Electronic Resource
    Naltrexone blocks RFR‐induced DNA double strand breaks in rat brain cells (1997)
    Springer
    Wireless networks 3 (1997), S. 471-476 
    Details
    ISSN: 1572-8196
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Computer Science
    Notes: Abstract Previous research in our laboratory has shown that various effects of radiofrequency electromagnetic radiation (RFR) exposure on the nervous system are mediated by endogenous opioids in the brain. We have also found that acute exposure to RFR induced DNA strand breaks in brain cells of the rat. The present experiment was carried out to investigate whether endogenous opioids are also involved in RFR‐induced DNA strand breaks. Rats were treated with the opioid antagonist naltrexone (1 mg/kg, IP) immediately before and after exposure to 2450 MHz pulsed (2 µs pulses, 500 pps) RFR at a power density of 2 mW/cm2 (average whole body specific absorption rate of 1.2 W/kg) for 2 hours. DNA double strand breaks were assayed in brain cells at 4 hours after exposure using a microgel electrophoresis assay. Results showed that the RFR exposure significantly increased DNA double strand breaks in brain cells of the rat, and the effect was partially blocked by treatment with naltrexone. Thus, these data indicate that endogenous opioids play a mediating role in RFR‐induced DNA strand breaks in brain cells of the rat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019154611749
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  • 18
    Electronic Resource
    Electronic Resource
    Predicting Invasive Plants: Prospects for a General Screening System Based on Current Regional Models (2000)
    Springer
    Biological invasions 2 (2000), S. 93-102 
    Details
    ISSN: 1573-1464
    Keywords: Hawaii ; Hawaiian Islands ; invasive plants ; prediction ; screening system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Screening systems for predicting invasive plants have been independently developed for the non-indigenous floras of North America, the South African fynbos, and Australia. To evaluate the performance of these screening systems outside the regions for which they were developed, we tested them for the non-indigenous flora of the Hawaiian Islands. When known invasive plant species in the Hawaiian Islands were evaluated using the North American and Australian systems, 82% and 93% of the species were predicted to be invasive, respectively, and the remainder were classified as requiring further study. The South African fynbos system correctly predicted only 60% of the invasive species in the Hawaiian Islands. All three screening systems correctly classified a majority of the non-invaders as non-invasive. The Australian system has several advantages over the other systems, including the highest level of correct identification of invaders (〉90%), ability to evaluate non-woody plants, and ability to evaluate a species even when the answers to some questions are unknown. Nevertheless, with the Australian system, a large fraction of species known not to be invasive were recommended for further study before importing, so there remains room for improvement in identifying non-invasive species. Based on our results for the Hawaiian Islands and a previous evaluation in New Zealand, the Australian system appears to be a promising template for building a globally applicable system for screening out invasive plant introductions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010002005024
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  • 19
    Electronic Resource
    Electronic Resource
    Intracerebroventricular injection of mu- and delta-opiate receptor antagonists block 60 Hz magnetic field-induced decreases in cholinergic activity in the frontal cortex and hippocampus of the rat (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 19 (1998), S. 432-437 
    Details
    ISSN: 0197-8462
    Keywords: 60 Hz magnetic field ; cholinergic activity ; frontal cortex ; hippocampus ; opiate receptor subtypes ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: In previous research, we have found that acute exposure to a 60 Hz magnetic field decreased cholinergic activity in the frontal cortex and hippocampus of the rat as measured by sodium-dependent high-affinity choline uptake activity. We concluded that the effect was mediated by endogenous opioids inside the brain because it could be blocked by pretreatment of rats before magnetic field exposure with the opiate antagonist naltrexone, but not by the peripheral antagonist naloxone methiodide. In the present study, the involvement of opiate receptor subtypes was investigated. Rats were pretreated by intracerebroventricular injection of the mu-opiate receptor antagonist, β-funaltrexamine, or the delta-opiate receptor antagonist, naltrindole, before exposure to a 60 Hz magnetic field (2 mT, 1 hour). It was found that the effects of magnetic field on high-affinity choline uptake in the frontal cortex and hippocampus were blocked by the drug treatments. These data indicate that both mu- and delta-opiate receptors in the brain are involved in the magnetic field-induced decreases in cholinergic activity in the frontal cortex and hippocampus of the rat. Bioelectromagnetics 19:432-437, 1998. © 1998 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
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  • 20
    Electronic Resource
    Electronic Resource
    Low-level microwave irradiation and central cholinergic activity: A dose-response study (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Bioelectromagnetics 10 (1989), S. 203-208 
    Details
    ISSN: 0197-8462
    Keywords: microwaves ; central choline uptake ; dose-response relationship ; Life and Medical Sciences ; Occupational Health and Environmental Toxicology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: Rats were irradiated with circularly polarized, 2,450-MHz pulsed microwaves (2-μs pulses, 500 pulses per second [pps]) for 45 min in the cylindrical waveguide system of Guy et al:(Radio Sci 14:63-74, 1979). Immediately after exposure, sodium-dependent high-affinity choline uptake, an indicator of cholinergic activity in neural tissue, was measured in the striatum, frontal cortex, hippocampus, and hypothalamus. The power density was set to give average whole-body specific absorption rates (SAR) of 0.3, 0.45, 0.6, 0.75, 0.9, or 1.2 W/kg to study the dose-response relationship between the rate of microwave energy absorption and cholinergic activity in the different areas of the brain. Decrease in choline uptake was observed in the striatum at a SAR of 0.75 W/kg and above, whereas for the frontal cortex and hippocampus, decreases in choline uptake were observed at a SAR of 0.45 W/kg and above. No significant effect was observed in the hypothalamus at the irradiation power densities studied. The probit analysis was used to determine the SAR50 in each brain area, i.e., the SAR at which 50% of maximum response was elicited. SAR50 values for the striatum, frontal cortex, and hippocampus were 0.65, 0.38, and 0.44 W/kg, respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bem.2250100209
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