tailieunhanh - Risk Management of Water Supply and Sanitation Systems

Continuing improvements led to the furnace and bellows and provided the ability to smelt and forge native metals (naturally occurring in relatively pure form).[38] Gold, copper, silver, and lead, were such early metals. The advantages of copper tools over stone, bone, and wooden tools were quickly apparent to early humans, and native copper was probably used from near the beginning of Neolithic times (about 8000 BC).[39] Native copper does not naturally occur in large amounts, but copper ores are quite common and some of them produce metal easily when burned in wood or charcoal fires. Eventually, the working of metals. | NATO Science for Peace and Security Series - C Environmental Security Risk Management of Water Suppty and Sanitation Systems Edited by Petr Hlavinek Cvetanka Popovska Jiri Marsalek Ivana Mahrikova Tamara Kukharchyk Springer VA1 nispublicMon The NATO Science for Peace W-7 QIAN is supported by and Security Programme Risk Management of Water Supply and Sanitation Systems NATO Science for Peace and Security Series This Series presents the results of scientific meetings supported under the NATO Programme Science for Peace and Security SPS . The NATO SPS Programme supports meetings in the following Key Priority areas 1 Defence Against Terrorism 2 Countering other Threats to Security and 3 NATO Partner and Mediterranean Dialogue Country Priorities. The types of meeting supported are generally Advanced Study Institutes and Advanced Research Workshops . The NATO SPS Series collects together the results of these meetings. The meetings are coorganized by scientists from NATO countries and scientists from NATO s Partner or Mediterranean Dialogue countries. The observations and recommendations made at the meetings as well as the contents of the volumes in the Series reflect those of participants and contributors only they should not necessarily be regarded as reflecting NATO views or policy. Advanced Study Institutes ASI are high-level tutorial courses intended to convey the latest developments in a subject to an advanced-level audience Advanced Research Workshops ARW are expert meetings where an intense but informal exchange of views at the frontiers of a subject aims at identifying directions for future action Following a transformation of the programme in 2006 the Series has been re-named and re-organised. Recent volumes on topics not related to security which result from meetings supported under the programme earlier may be found in the NATO Science Series. The Series is published by IOS Press Amsterdam and Springer Dordrecht in conjunction with the NATO Public Diplomacy .