86,167 research outputs found
Computer program for network synthesis by frequency response fit
Computer program synthesizes a passive network by minimizing the difference in desired and actual frequency response. The program solves for the critical points of the error function /weighted least squares fit between calculated and desired frequency response/ by the multivariable Newton-Raphson method with components constrained to an admissible region
Performative regulation: a case study in how powerful people avoid criminal labels
This paper explores the role of invested powerful business actors in the criminalisation process as applied to the illicit antiquities market. We present a case study of the precise mechanics of the role played by trade interests in the formation of the Dealing in Cultural Objects (Offences) Act 2003. This process involved the trade’s entering appearance in the legislative process and neutralising the possible constraining effects on its members of the new criminal offence which was to be created. We begin by exploring the political, historical and economic context in which discussion of the terms of the 2003 Act first began. We then follow the Act from its genesis through its various stages of drafting and re-drafting, to its enactment. This case study of a single piece of legislation provides further data to add to the line of prior research that illustrates that powerful white-collar criminals, as well as sometimes preventing criminal legislation entering the statute books, can also influence the design of criminal legislation that does enter the statute books in order to protect themselves and their own business interests. We also use this case study of a process of contemporary law-making to outline the concept of performative regulation: broadly, that which in appearance serves political ends but in practice effects an inconsequential level of control
Rotational excitation of symmetric top molecules by collisions with atoms: Close coupling, coupled states, and effective potential calculations for NH3-He
The formalism for describing rotational excitation in collisions between symmetric top rigid rotors and spherical atoms is presented both within the accurate quantum close coupling framework and also the coupled states approximation of McGuire and Kouri and the effective potential approximation of Rabitz. Calculations are reported for thermal energy NH3-He collisions, treating NH3 as a rigid rotor and employing a uniform electron gas (Gordon-Kim) approximation for the intermolecular potential. Coupled states are found to be in nearly quantitative agreement with close coupling results while the effective potential method is found to be at least qualitatively correct. Modifications necessary to treat the inversion motion in NH3 are discussed
An Analysis of Four-quark Energies in SU(2) Lattice Monte Carlo using the Flux-tube Symmetry:
Energies of four-quark systems calculated by the static quenched SU(2)
lattice Monte Carlo method are analyzed in bases for square,
rectangle, tilted rectangle, linear and quadrilateral geometry configurations
and in bases for a non-planar geometry configuration. For small
interquark distances, a lattice effect is taken into account by considering
perimeter dependent terms which are characterized by the cubic symmetry. It is
then found that a parameter - that can be identified as a gluon field
overlap factor - is rather well described by the form , where and are the area and
perimeter mainly defined by the positions of the four quarks, is the
string constant in the 2-quark potentials and are constants.Comment: (19 pages of Latex - 1 page of figures not included - sent on
request). Preprint HU-TFT-94-2
Design concepts for the ASTROMAG cryogenic system
Described is a proposed cryogenic system used to cool the superconducting magnet for the Space Station based ASTROMAG Particle Astrophysics Facility. This 2-meter diameter superconducting magnet will be cooled using stored helium II. The paper presents a liquid helium storage concept which would permit cryogenic lifetimes of up to 3 years between refills. It is proposed that the superconducting coil be cooled using superfluid helium pumped by the thermomechanical effect. It is also proposed that the storage tank be resupplied with helium in orbit. A method for charging and discharging the magnet with minimum helium loss using split gas-cooled leads is discussed. A proposal to use a Stirling cycle cryocooler to extend the storage life of the cryostat will also be presented
Linear response formula for open systems
An exact expression for the finite frequency response of open classical
systems coupled to reservoirs is obtained. The result is valid for any
conserved current. No assumption is made about the reservoirs apart from
thermodynamic equilibrium. At non-zero frequencies, the expression involves
correlation functions of boundary currents and cannot be put in the standard
Green-Kubo form involving currents inside the system
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