1,245 research outputs found

    Policy alternatives in Soviet environmental protection.

    Get PDF
    A number of developments over the past decade or so illustrate the increasing salience of environmental problems for Soviet policy makers. In the mid-1960s, controversy over the potential pollution of Lake Baikal appears to have stimulated and legitimized environmental protection as an issue for discussion in the Soviet press. The output of scholarly books and articles by philosophers, economists, biologists, physicists, and sociologists reflects the broad range of organizations concerned with these questions. Support is also evident in high places-Brezhnev\u27s report to the 25th Party Congress in 1976 emphasized the importance of environmental protection and announced that 11 billion rubles would be allocated for the purpose during the tenth five-year plan.3 N.K. Baibakov, Chairman of the State Planning Committee recently outlined planned capital investments of 1.8 billion rubles for the implementation of environmental protection measures in 1981.4 Greater organizational commitment is evident in the elevation of the former Hydrometeorology Service attached to the Council of Ministers to a State Committee on Hydrometeorology and Oversight of the Environment. The committee\u27s director, Dr. Iu. Izrael, claimed his organization had approximately 10,000 personnel working on environmental problems as of early 1979

    Russia and the CIS in 2008 : axis of authoritarianism?

    Get PDF
    Russia’s seamless presidential succession produced no major changes in domestic politics or foreign policy. Ties with Asia remained strong, though several key relationships—with China, Japan, and the Central Asian states—frayed under the impact of Russia’s military action in Georgia. Impressive economic performance in the first half of the year boosted Russian confidence as a great power, but its vulnerability to the global financial crisis together with the heavy-handed operation in the Caucasus undermined Moscow’s standing with both Asia and Europe by the end of the year

    Russia and the CIS in 2007 : Putin\u27s final year?

    Get PDF
    Russia in 2007 moved further away from a constitutional order governed by the rule of law as President Vladimir Putin\u27s second term drew to a close and the country prepared for parliamentary and presidential elections. High oil and gas prices buoyed the economy, but little progress was made in addressing Russia\u27s serious social problems. In foreign policy, confrontation with the West was balanced by excellent relations with most of Asia

    Central Asia, the Shanghai Cooperation Organization, and American foreign policy : from indifference to engagement.

    Get PDF
    This paper examines U.S. engagement in Central Asia over the past two decades, with specific reference to the Shanghai Cooperation Organization. While alarmist voices occasionally warn of the threat to American interests from China and Russia through the SCO, the organization’s influence appears limited. Washington has engaged it only sporadically, preferring to conduct relations bilaterally with the Central Asian states

    Neomercantilism and great-power energy competition in Central Asia and the Caspian.

    Get PDF
    The neomercantilist energy policies of China and Russia contribute to what is largely a competitive relationship among all three great powers in Central Asia. While neomercantilist policies do not negate the possibility of cooperation and the development of norms, rules, and institutions designed to promote collective action, they certainly erect formidable barriers

    W/SiC x-ray multilayers optimized for use above 100 keV

    Get PDF
    We have developed a new depth-graded multilayer system comprising W and SiC layers, suitable for use as hard x-ray reflective coatings operating in the energy range 100-200 keV. Grazing-incidence x-ray reflectance at E = 8 keV was used to characterize the interface widths, as well as the temporal and thermal stability in both periodic and depth-graded W/SiC structures, whereas synchrotron radiation was used to measure the hard x-ray reflectance of a depth-graded multilayer designed specifically for use in the range E ~150-170 keV. We have modeled the hard x-ray reflectance using newly derived optical constants, which we determined from reflectance versus incidence angle measurements also made using synchrotron radiation, in the range E = 120-180 keV. We describe our experimental investigation in detail, compare the new W/SiC multilayers with both W/Si and W/B4C films that have been studied previously, and discuss the significance of these results with regard to the eventual development of a hard x-ray nuclear line telescope

    Production and calibration of the first HEFT hard x-ray optics module

    Get PDF
    Complete hard X-ray optics modules are currently being produced for the High Energy Focusing Telescope (HEFT), a balloon born mission that will observe a wide range of objects including young supernova remnants, active galactic nuclei, and galaxy clusters at energies between 20 and 70 keV. Large collecting areas are achieved by tightly nesting layers of grazing incidence mirrors in a conic approximation Wolter-I design. The segmented layers are made of thermally-formed glass substrates coated with depth-graded multilayer films for enhanced reflectivity. Our novel mounting technique involves constraining these mirror segments to successive layers of precisely machined graphite spacers. We report the production and calibration of the first HEFT optics module

    Hard x-ray characterization of a HEFT single-reflection prototype

    Get PDF
    We have measured the hard X-ray reflectivity and imaging performance from depth graded W/Si multilayer coated mirror segments mounted in a single reflection cylindrical prototype for the hard X-ray telescopes to be flown on the High Energy Focusing Telescope (HEFT) balloon mission. Data have been obtained in the energy range from 18 - 170 keV at the European Synchrotron Radiation Facility and at the Danish Space Research Institute at 8 keV. The modeling of the reflectivity data demonstrate that the multilayer structure can be well described by the intended power law distribution of the bilayer thicknesses optimized for the telescope performance and we find that all the data is consistent with an interfacial width of 4.5 Å. We have also demonstrated that the required 5% uniformity of the coatings is obtained over the mirror surface and we have shown that it is feasible to use similar W/Si coatings for much higher energies than the nominal energy range of HEFT leading the way for designing Gamma-ray telescopes for future astronomical applications. Finally we have demonstrate 35 arcsecond Half Power Diameter imaging performance of the one bounce prototype throughout the energy range of the HEFT telescopes

    In Vivo Imaging of Chikungunya Virus in Mice and Aedes Mosquitoes Using a Renilla Luciferase Clone

    Get PDF
    Chikungunya virus (CHIKV) is a mosquito-borne alphavirus that in humans causes an acute febrile illness characterized by fever, arthralgia, and rash. It is currently associated with large outbreaks in Asia, Africa, and islands of the Indian Ocean and has been introduced from these tropical regions into Europe, where local transmission has been recorded on two occasions. The underlying basis of the pathogenesis of CHIKV and related alphaviruses that produce similar symptoms remains unclear. By applying new techniques, for example, in vivo imaging in live animals and arthropods, we may improve our understanding of viral pathogenesis in vertebrates and viral replication in mosquitoes. This technical report describes the evaluation of a CHIKV–luciferase clone to visualize infection and dissemination in both Aedes aegypti and Aedes albopictus mosquitoes and mice. In mosquitoes, luciferase activity was seen at 3 and 7 days post-infection in both head and abdomens. In vivo imaging of CHIKV–luciferase was detected in mice for up to 5 days post-infection at the site of inoculation with limited dissemination to the skeletal muscle
    • 

    corecore