Seismology

Seismology (/saɪzˈmɒlədʒi/; from Greek σεισμός "earthquake" and -λογία "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies. The field also includes studies of earthquake environmental effects, such as tsunamis as well as diverse seismic sources such as volcanic, tectonic, oceanic, atmospheric, and artificial processes (such as explosions). A related field that uses geology to infer information regarding past earthquakes is paleoseismology. A recording of earth motion as a function of time is called a seismogram. A seismologist is a scientist who does research in seismology.

History

Scholarly interest in earthquakes can be traced back to antiquity. Early speculations on the natural causes of earthquakes were included in the writings of Thales of Miletus (c. 585 BCE), Anaximenes of Miletus (c. 550 BCE), Aristotle (c. 340 BCE) and Zhang Heng (132 CE).

In 132 CE, Zhang Heng of China's Han dynasty designed the first known seismoscope.

Seismic (album)

Seismic is the seventh studio album by San Diegan punk band Dogwood, originally titled Your Tongue Is the Deadliest of Arrows by the band. Artwork photos feature former members Scott Bergen and Eddie Spangler, although they did not perform on the album's recording, and both had left the band by the time of its release. Bassist Jason Harper announced he was leaving the group during the album's recording.

Track listing

Acquisition

Acquisition may refer to:

Government procurement in the United States

Government procurement in the United States is the process by which the federal government of the United States acquires goods, services (notably construction), and interests in real property. Contracts for government procurement usually involve appropriated funds spent on supplies, services, and interests in real property by and for the use of the federal government through purchase or lease, whether the supplies, services, or interests are already in existence or must be created, developed, demonstrated, and evaluated. See 48 C.F.R. § 2.101 ("Acquisition" defined, as to goods and services only). Federal government contracting has the same legal elements as contracting between private parties: a lawful purpose, competent contracting parties, an offer, an acceptance that complies with the terms of the offer, mutuality of obligation, and consideration. However, federal contracts are much more heavily regulated, subject to volumes of statutes dealing with federal contracts and the federal contracting process, mostly in Titles 10, 31, 40, and 41 of the United States Code.

Military acquisition

Military acquisition is the bureaucratic management and procurement process dealing with a nation's investments in the technologies, programs, and product support necessary to achieve its national security strategy and support its armed forces. Its objective is to acquire products that satisfy specified needs and provide measurable improvement to mission capability at a fair and reasonable price.

Concept

Military acquisition has a long history spanning from ancient times (e.g., blacksmithing, shipbuilding) to modern times.

Modern military acquisition is a complex blend of science, management, and engineering disciplines within the context of a nation's law and regulation framework to produce military material and technology. This complexity evolved from the increasing complexity of weapon systems starting in the 20th century. For example, the Manhattan Project involved more than 130,000 people at an estimated cost of nearly $24 billion in 2008 dollars.

In the twenty-first century, the trend has been for countries to cooperate in military procurement, due to the rising cost-per-unit of digital age military hardware such as ships and jets. For example, NORDEFCO (established 2009) is a grouping of Nordic countries that cooperate in defence spending, the Defence and Security Co-operation Treaty was signed between the United Kingdom and France in 2010, and Joint Strike Fighter program which selected the Lockheed Martin F-35 Lightning II in 2001 included the United States, the United Kingdom, Australia, Italy, Canada, the Netherlands, Norway, Denmark, Turkey, Israel and Japan.