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Security in Space: What Is at Stake and How Do We Move Forward?
( Laura Grego ) 경남대학교 극동문제연구소 2011 ASIAN PERSPECTIVE Vol.35 No.4
In recent decades, satellites have become increasingly important in the economic, civil, and military spheres. At the same time, space has become more crowded with satellites and the debris from their use, and many more states have become spacefaring. However, the legal and normative regime has not kept pace with these changes. Recent trends and events-including demonstrations of antisatellite (ASAT) capability, a collision between satellites, and a dramatic increase in dangerous space debris-make clear that the space environment needs more protection, that satellites face growing risks, and that space activities may be a potential source of mistrust and tension between countries. While voluntary confidence-building and transparency measures can help solve some of these issues, more substantive engagement is required to keep space safe and secure into the future.
Golding, Brian,Acutis, Pier Luigi,Peletto, Simone,Grego, Elena,Colussi, Silvia,Riina, Maria Vittoria,Rosati, Sergio,Mignone, Walter,Caramelli, Maria Canadian Science Publishing 2008 Genome Vol.51 No.12
<P> A reminder that another paper on the cetacean PRNP locus has been published before Kim et al.’s paper (2008. Genome, 51: 452-464) is presented along with a consideration of the related results. </P>
최각규,Jintu Francis Kurisingal,CHUNG YONGCHUL GREGO,박대원 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.6
A two-dimensional Zn-based metal-organic framework has been synthesized by using Zn(II) ions and H2SDC (4,4'-stilbenedicarboxylic acid) under solvothermal conditions. The framework having a trinuclear Zn3-(RCO2)6 SBUs connected by the 4,4'-stilbenedicarboxylic acid to form a hexagonal network, shows a two-dimensional structure and displays high thermal stability up to approximately 330 oC. The role of Zn2+ (from Zn-SDC) for epoxide activation and Br- ion (from TBABr) for ring opening of epoxide was studied for the cycloaddition reaction of CO2 and propylene oxide (PO) under ambient conditions. Zn-SDC was found catalytically efficient towards CO2-epoxide coupling under ambient reaction conditions with high selectivity towards the desired cyclic carbonates under solvent-free conditions. The effects of various reaction parameters such as catalyst loading, temperature, CO2 pressure, and time were evaluated. Zn-SDC was easily separable and reusable at least five times without any considerable loss in the initial activity. A plausible reaction mechanism for the cycloaddition reaction was also proposed based on literature and experimental inferences.