LEADER 01150nam a2200265 i 4500 001 991000084789707536 005 20020506121806.0 008 010104s1966 uk ||| | eng 035 $ab10650957-39ule_inst 035 $aEXGIL139186$9ExL 040 $aBiblioteca Interfacoltà$bita 082 0 $a821.1 100 1 $aDay, Mabel$0196755 245 10$aSir Gawain and the Green knight :$bre-edited from ms. Cotton Nero, A.X., in the British museum /$cby Sir Israél Gollancz ; with introductory essays by Mabel Day and Mary S. Serjeantson 260 $aLondon :$bOxford University Press,$c1966 300 $aLXXII, 186 p. ;$c23 cm. 490 0 $aEarly English text society ;$v210 700 1 $aGollancz, Israél, Sir$eauthor$4http://id.loc.gov/vocabulary/relators/aut$0470192 740 0 $aSir Gawain and the green knight 907 $a.b10650957$b23-02-17$c28-06-02 912 $a991000084789707536 945 $aLE002 In. III G 26$g1$i2002000923240$lle002$o-$pE0.00$q-$rl$s- $t0$u0$v0$w0$x0$y.i10740442$z28-06-02 996 $aSir Gawain and the Green knight$91455125 997 $aUNISALENTO 998 $ale002$b01-01-01$cm$da $e-$feng$guk $h0$i1 LEADER 04067nam 2200625Ia 450 001 9910781138703321 005 20230725051656.0 010 $a0-309-15721-8 010 $a1-282-78732-2 010 $a9786612787324 010 $a0-309-14969-X 035 $a(CKB)2550000000027542 035 $a(EBL)3378638 035 $a(SSID)ssj0000415563 035 $a(PQKBManifestationID)11273624 035 $a(PQKBTitleCode)TC0000415563 035 $a(PQKBWorkID)10416087 035 $a(PQKB)10847616 035 $a(MiAaPQ)EBC3378638 035 $a(Au-PeEL)EBL3378638 035 $a(CaPaEBR)ebr10405102 035 $a(CaONFJC)MIL278732 035 $a(OCoLC)923281848 035 $a(EXLCZ)992550000000027542 100 $a20100218d2010 uy 0 101 0 $aeng 135 $aurcn||||||||| 181 $ctxt 182 $cc 183 $acr 200 10$aDefending planet Earth$b[electronic resource] $enear-Earth object surveys and hazard mitigation strategies /$fCommittee to Review Near-Earth-Object Surveys and Hazard Mitigation Strategies ; Space Studies Board ; Aeronautics and Space Engineering Board, Division on Engineering and Physical Sciences, National Research Council of the National Academies 210 $aWashington, D.C. $cNational Academies Press$dc2010 215 $a1 online resource (152 p.) 300 $aDescription based upon print version of record. 311 $a0-309-14968-1 320 $aIncludes bibliographical references. 327 $a""Front Matter""; ""Dedication""; ""Preface""; ""Acknowledgments""; ""Contents""; ""Summary""; ""1 Introduction""; ""2 Risk Analysis""; ""3 Survey and Detection of Near-Earth Objects""; ""4 Characterization""; ""5 Mitigation""; ""6 Research""; ""7 National and International Coordination and Collaboration""; ""8 Optimal Approaches""; ""Appendixes""; ""Appendix A: Independent Cost Assessment""; ""Appendix B: Letter of Request""; ""Appendix C: Committee, Panel, and Staff Biographical Information""; ""Appendix D: Minority Opinion Mark Boslough, Mitigation Panel Member"" 327 $a""Appendix E: Glossary and Selected Acronyms"" 330 $a"The United States spends approximately $4 million each year searching for near-Earth objects (NEOs). The objective is to detect those that may collide with Earth. The majority of this funding supports the operation of several observatories that scan the sky searching for NEOs. This, however, is insufficient in detecting the majority of NEOs that may present a tangible threat to humanity. A significantly smaller amount of funding supports ways to protect the Earth from such a potential collision or "mitigation." In 2005, a Congressional mandate called for NASA to detect 90 percent of NEOs with diameters of 140 meters of greater by 2020. Defending Planet Earth: Near-Earth Object Surveys and Hazard Mitigation Strategies identifies the need for detection of objects as small as 30 to 50 meters as these can be highly destructive. The book explores four main types of mitigation including civil defense, "slow push" or "pull" methods, kinetic impactors and nuclear explosions. It also asserts that responding effectively to hazards posed by NEOs requires national and international cooperation. Defending Planet Earth: Near-Earth Object Surveys and Hazard Mitigation Strategies is a useful guide for scientists, astronomers, policy makers and engineers."--Publisher's description. 606 $aNear-Earth objects 606 $aAsteroids$xCollisions with Earth 606 $aComets$xCollisions with Earth 615 0$aNear-Earth objects. 615 0$aAsteroids$xCollisions with Earth. 615 0$aComets$xCollisions with Earth. 676 $a523.44 712 02$aNational Research Council (U.S.).$bSpace Studies Board. 712 02$aNational Research Council (U.S.).$bAeronautics and Space Engineering Board. 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9910781138703321 996 $aDefending planet Earth$93673695 997 $aUNINA