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1. |
Record Nr. |
UNINA9910258756103321 |
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Titolo |
IEEE Std 802.15.8-2017 : IEEE Standard for Wireless Medium Access Control (MAC) and Physical Layer (PHY) Specifications for Peer Aware Communications (PAC) / / Institute of Electrical and Electronics Engineers |
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Pubbl/distr/stampa |
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New York : , : IEEE, , [2018] |
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ISBN |
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Descrizione fisica |
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1 online resource (322 pages) |
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Disciplina |
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Soggetti |
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Distributed operating systems (Computers) |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Sommario/riassunto |
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Physical layer (PHY) and medium access control (MAC) mechanisms are defined in this standard for wireless personal area networks (WPANs) peer aware communications (PAC) optimized for peer-to-peer and infrastructure-less communications with fully distributed coordination. PAC features include discovery for peer information without association, discovery signaling rate typically greater than 100 kb/s, discovery of the number of devices in the network, scalable data transmission rates typically up to 10 Mb/s, group communications with simultaneous membership in multiple groups typically up to 10, relative positioning, security, and operation in selected globally available unlicensed/licensed bands below 11 GHz capable of supporting these requirements. |
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2. |
Record Nr. |
UNINA9910961111103321 |
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Titolo |
Safe on Mars : precursor measurements necessary to support human operations on the Martian surface / / Committee on Precursor Measurements Necessary to Support Human Operations on the Surface of Mars, Aeronautics and Space Engineering Board, Space Studies Board, Division on Engineering and Physical Sciences, National Research Council |
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Pubbl/distr/stampa |
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Washington, D.C., : National Academy Press, c2002 |
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ISBN |
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9786610183784 |
9780309169592 |
0309169593 |
9781280183782 |
1280183780 |
9780309502009 |
0309502004 |
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Edizione |
[1st ed.] |
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Descrizione fisica |
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1 online resource (63 p.) |
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Collana |
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Disciplina |
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Soggetti |
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Mars surface samples |
Mars surface samples - Contamination |
Planetary quarantine |
Mars (Planet) Exploration |
Mars (Planet) Equipment and supplies |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Description based upon print version of record. |
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Nota di bibliografia |
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Includes bibliographical references. |
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Nota di contenuto |
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Front Matter; Preface; Contents; Tables, Figure, and Boxes; Executive Summary; 1 Introduction; 2 The Mars Program in Context; 3 Physical Environmental Hazards; 4 Chemical Environmental Hazards; 5 Potential Hazards of the Biological Environment; Appendix A Statement of Task; Appendix B Biographical Sketches of Committee Members; Appendix C Acronyms and Abbreviations |
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Sommario/riassunto |
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This study, commissioned by the National Aeronautics and Space Administration (NASA), examines the role of robotic exploration |
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missions in assessing the risks to the first human missions to Mars. Only those hazards arising from exposure to environmental, chemical, and biological agents on the planet are assessed. To ensure that it was including all previously identified hazards in its study, the Committee on Precursor Measurements Necessary to Support Human Operations on the Surface of Mars referred to the most recent report from NASA's Mars Exploration Program/ Payload Analysis Group (MEPAG) (Greeley, 2001). The committee concluded that the requirements identified in the present NRC report are indeed the only ones essential for NASA to pursue in order to mitigate potential hazards to the first human missions to Mars. |
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