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The high prices of precious metals like platinum group metals
(PGM's) have ensured that there is continued interest in the
development of new extractants for the commercial concentration and
separation of these metals. The PGM's platinum, palladium, rhodium,
iridium, osmium and ruthenium together with silver, and gold
generally occur in nature with the major base metals like iron,
copper, nickel and cobalt and wide range of minor elements such as
lead, tellurium, selenium and arsenic and both technical and
commercial considerations demand that the indusial PGM's be
separated from the other metals and each other to high purity, with
high yield and with a high percentage recovery. Liquid- liquid
extraction (LLE), also called solvent extraction (SX), is a process
that allows the separation of two or more components due to their
unequal solubility's in two immiscible liquid phases. In LLE
processes, there are many cases both in analytical and industrial
chemistry where the main objective of separation is achieved by
extraction using a chemical extractant. In analytical and
separation science, this method enjoys a favored position among
separation techniques because of its simplicity.
Threats of cyberattacks targeting the electric power grid have been
increasing in recent years. The consequence of cyber incidents on
the power grid includes equipment damage, cascading events,
large-scale power outages, and disruption of market functions.
Government and industry have made a significant effort to
strengthen the protection of the power infrastructure against cyber
threats by setting standards and guidelines. This survey paper
provides the basic concepts of cyber vulnerabilities of
distribution systems and cyber-physical system security. Important
ICT subjects for distribution systems covered in this paper include
Supervisory Control and Data Acquisition (SCADA) and Distributed
Energy Resources (DERs), including renewable energy and smart
meters. This publication is intended to serve as a module in
senior-level undergraduate as well as graduate courses in power
engineering. The objective of this paper is to provide fundamental
concepts of cyber security for the distribution system as a
cyber-physical system. To meet the objective, vulnerabilities of
cyber intrusions and mitigation strategies are discussed. The
evolution of the ICT for the power grid and cyber security measures
are presented, as well as the ICT in the power system environment.
An overview of smart grid communication standards and protocols are
included, and the detection of cyber intrusions in distribution
systems are considered. Finally, simulation cases are provided.
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