104 research outputs found
ISLAND, revisited
No full textThis paper is in answer to the comment on the GRG paper: Lockerbie N.A. Gen. Rel. Grav. 36, 593 (2004), made by A.V. Sanders, G.T. Gillies
Sampling frequency meter
No full textThe author describes a low-cost battery-powered instrument based on the c-mos Motorola MC146805 E2P microprocessor. In this instrument the input is sampled repetitively and compared with a table of values stored in memory, so that over time, a distribution of the sampled input is built up in 21 internal memory channels (20 channels plus 1 'over-range' channel). The program controlling the microprocessor can be adapted to suit different needs by simply changing the values stored in this table, and/or by changing the measuring period
Reply to Stacy Lockerbie (Review of \u3cem\u3eConception Diary: Thinking About Pregnancy and Motherhood\u3c/em\u3e by Susan Hogan)
No full textReply by the author regarding the following book review: Stacy Lockerbie, JIWS, Vol. 9. No. 1. November 2007. pp. 319-321. Review of Conception Diary: Thinking About Pregnancy and Motherhood. Susan Hogan
ISLAND - inverse square law acceleration measurement using iNertial drift
No full textBy using a novel free-flying, rotating, optical bench aboard the International Space Station (ISS) as the basis for a measurement of differential acceleration between two gravitating bodies, in principle the Newtonian inverse-square law and the constant of gravitation, G, can be determined at the parts in 106 level
REFLECTION OF PHONONS IN 4He BY NaF
No full textOn a mesuré la distribution angulaire après réflexion sur une interface clivée NaF- 4He liquide, d'un faisceau collimaté venant de l'hélium sous un angle d'incidence de ~ 10°. Les résultats suggèrent l'existence d'états de l'interface qui n'interagissent qu'avec une partie du spectre de phonons incident.The angular distribution after reflection at a cleaved NaF-liquid 4He interface of a collimated phonon beam incident from the helium at a grazing angle of incidence of ~ 10° has been measured. The results suggest the existence of interface states which interact with only a part of the incident phonon spectrum
The Lockerbie Controversy: Tension Between The International Court of Justice and the Security Council
No full textPan American Flight 103 exploded midair over Lockerbie, Scotland on December 21,1988. Investigations suggested that two Libyan nationals were to blame. When the U.N. Security Council imposed sanctions on the Libyan government in 1993 for its failure to cooperate with U.S. and U.K extradition requests, Libya turned to the International Court of Justice (ICJ) for help. Libya asked the ICJ to declare that Libya was not obliged to extradite its nationals to the United States or the United Kingdom and further asked the Court to enjoin the U.S. and the U.K from the use of force or threats against Libya. In 1998, the ICJ found it had jurisdiction to hear the case, which put two bodies of the United Nations on a collision course. The author explores how the U.N. system handles its internal tensions, and compares the international system with U.S. federalism and civil rights. How far can judicial review reach in the global system
Forward modelling of geophysical survey data using cylindrical elemental volumes
No full textA simple model is presented for the gravitational field due to a finite cylinder, and this is elaborated so that (in principle) the gravitational field from a body of any shape may be found in terms of the field of such primitive cylinders. The primitive field is described as a moment-expansion in terms of odd-order Legendre polynomials P-2p+1 (cos theta), p=0, 1, 2,..., where theta is the angle between the field point and the cylinder's axis, and in terms of the radial distance R of the field point from the centre of mass of the cylinder, such that the parameters describing the shape of the cylinder, and the field point parameters, are separated. This allows gravitational field modelling calculations to be carried out extremely quickly in the space domain for gravitational sources of any shape. Moreover, the form of the solutions-due to the separation mentioned above-allows a clear insight into the underlying physical mechanisms involved in the synthesis of such fields, making such elements suitable in the solution of inverse gravitational problems in the space domain, as well
A displacement-doubling prism
No full textThis paper describes a novel type of prism that can be used to 'noiselessly' double the sensitivity of certain types of high-sensitivity optical displacement sensor. Such a prism has been manufactured, and its displacement-doubling property has been verified
Analytical evaluation of short-range forces in cylindrical geometry
No full textThis paper concerns the potential field for Yukawa-type forces in a cylindrical geometry. A set of formulae is derived for a cylindrical body in order to reduce the integration over the body from 3D (or 6D for a pair of interacting bodies) to either a 1D integration, or an analytical formula. Using these formulae we consider analytically the potential field of two Yukawa force terms, and reanalyse Long's and Spero et al's experiments for the inverse-square law test. The results show that the - graph produces similar results to the case where a single Yukawa term is considered. The theory can also be applied to other problems in short-range force experiments that involve cylindrically shaped bodies as the test masses
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