Railroad mileage pay and piece rates in other industries : a report /

February 1961--Cover.

Metropolitan statistical areas : new standards and their impact on selected federal programs : report to the Subcommittee on Technology, Information Policy, Intergovernmental Relations and the Census, Committee on Government Reform, House of Representatives /

"GAO-04-758."

A treatise on the law of libel and the liberty of the press; showing the origin, use, and abuse of the law of libel: with copious notes and references to authorities in Great Britain and the United States: as applicable to individuals and to political and ecclesiastical bodies and principles.

Microfilm. Ann Arbor, Mich. University Microfilms (n.d.) (American Culture Series, Reel 238.4)

Reprint of a report on the origin, geological relations and composition of the nickel and copper deposits of the Sudbury Mining District, Ontario, Canada /

A revision of the original report of 1904.

The principles of nature, her divine relations, and a voice to mankind.

T.L.s. To Dewey L. Hanner, from Ross B. Lowe, August, 1940.

Dissertations and discussions: political, philosophical, and historical.

Mode of access: Internet.

An Aging society : meeting the needs of the elderly while responding to rising federal costs : report to the Chairman, Subcommittee on Intergovernmental Relations and Human Resources, Committee on Government Operations, House of Representatives /

"B-223880"--P. [1].

Microeconomics and the space economy; the effectiveness of an oligopolistic market economy.

Includes bibliography.

Anecdotes of painting in England; with some account of the principal artists; and incidental notes on other arts;

Bookplate of W. S. Appleton.

The National union catalog, pre-1956 imprints ; a cumulative author list representing Library of Congress printed cards and titles reported by other American libraries /

Vols. 686-754 comprise a supplement.

Is cannabis a gateway drug? Testing hypotheses about the relationship between cannabis use and the use of other illicit drugs

We outline and evaluate competing explanations of three relationships that have consistently been found between cannabis use and the use of other illicit drugs, namely, ( 1) that cannabis use typically precedes the use of other illicit drugs; and that ( 2) the earlier cannabis is used, and ( 3) the more regularly it is used, the more likely a young person is to use other illicit drugs. We consider three major competing explanations of these patterns: ( 1) that the relationship is due to the fact that there is a shared illicit market for cannabis and other drugs which makes it more likely that other illicit drugs will be used if cannabis is used; ( 2) that they are explained by the characteristics of those who use cannabis; and ( 3) that they reflect a causal relationship in which the pharmacological effects of cannabis on brain function increase the likelihood of using other illicit drugs. These explanations are evaluated in the light of evidence from longitudinal epidemiological studies, simulation studies, discordant twin studies and animal studies. The available evidence indicates that the association reflects in part but is not wholly explained by: ( 1) the selective recruitment to heavy cannabis use of persons with pre-existing traits ( that may be in part genetic) that predispose to the use of a variety of different drugs; ( 2) the affiliation of cannabis users with drug using peers in settings that provide more opportunities to use other illicit drugs at an earlier age; ( 3) supported by socialisation into an illicit drug subculture with favourable attitudes towards the use of other illicit drugs. Animal studies have raised the possibility that regular cannabis use may have pharmacological effects on brain function that increase the likelihood of using other drugs. We conclude with suggestions for the type of research studies that will enable a decision to be made about the relative contributions that social context, individual characteristics, and drug effects make to the relationship between cannabis use and the use of other drugs.

Properties of the stochastic Gross-Pitaevskii equation: finite temperature Ehrenfest relations and the optimal plane wave representation

We present Ehrenfest relations for the high temperature stochastic Gross-Pitaevskii equation description of a trapped Bose gas, including the effect of growth noise and the energy cutoff. A condition for neglecting the cutoff terms in the Ehrenfest relations is found which is more stringent than the usual validity condition of the truncated Wigner or classical field method-that all modes are highly occupied. The condition requires a small overlap of the nonlinear interaction term with the lowest energy single particle state of the noncondensate band, and gives a means to constrain dynamical artefacts arising from the energy cutoff in numerical simulations. We apply the formalism to two simple test problems: (i) simulation of the Kohn mode oscillation for a trapped Bose gas at zero temperature, and (ii) computing the equilibrium properties of a finite temperature Bose gas within the classical field method. The examples indicate ways to control the effects of the cutoff, and that there is an optimal choice of plane wave basis for a given cutoff energy. This basis gives the best reproduction of the single particle spectrum, the condensate fraction and the position and momentum densities.