Distinguishing between MSSM and NMSSM with e\gamma Scattering

We study the associated production of selectrons and neutralinos with subsequent leptonic decay of the selectron in e\gamma scattering within the framework of MSSM and NMSSM. Due to the weak couplings of singlino dominated neutralinos, associated neutralino production e^+ + e^- -> neutralino_1 + neutralino_2 at a linear collider can be strongly suppressed in some regions of the parameter space. Then the process e + gamma -> selectron_{L/R} + neutralino_{1/2} -> e + neutralino_{1/2} + neutralino_1 can give additional informations on the underlying theory and the character of neutralino_1 and neutralino_2.Comment: 7 pages, 7 figeres, LaTex, Talk Given at the International Workshop on High Energy Photon Colliders, DESY Hamburg, June 14-17, 200

Correction to: The scaling limit behaviour of periodic stable-like processes

Correction to Bernoulli (2006), 12, 551--570 http://projecteuclid.org/euclid.bj/1151525136Comment: Published at http://dx.doi.org/10.3150/07-BEJ5127 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm

ALL OR NOTHING? NATURE IN CHINESE THOUGHT AND THE APOPHATIC OCCIDENT

This paper develops an interpretation of nature in classical Chinese culture through dialogue with the work of François Jullien. I understand nature negatively as precisely what never appears as such nor ever can be exactly apprehended and defined. For perception and expression entail inevitably human mediation and cultural transmission by semiotic and hermeneutic means that distort and occult the natural in the full depth of its alterity. My claim is that the largely negative approach to nature that Jullien finds in sources of Chinese tradition can also be found in the West, particularly in its apophatic currents or countercurrents that contest all along the more powerful positive conceptions and systems for construing and mastering the natural world. These insights grow especially from the critique of idolatry, in which worship of nature, in concrete, objective forms taken as gods, is negated. Bringing out this negative-theological matrix can give us a perspective on Jullien’s treatment and expose some of his own biases notably in favor of immanence to the exclusion of metaphysical transcendence. Comparative philosophy serves in this negative-theological key self-critically to identify blind spots in one’s own culture

Computer program determines gas flow rates in piping systems

Computer program calculates the steady state flow characteristics of an ideal compressible gas in a complex piping system. The program calculates the stagnation and total temperature, static and total pressure, loss factor, and forces on each element in the piping system

A short note on the problematic concept of excess demand in asset pricing models with mean-variance optimization

Referring to asset pricing models where demand is proportional to excess returns and said to be derived from a mean-variance optimization problem, the note formulates what probably is common knowledge but hardly ever made an explicit subject of discussion. This is an insufficient distinction between the desired holding of the risky asset on the part of the speculative agents, which is the solution to the optimization problem and usually directly presented as excess demand, and the desired change in this holding, which is what should reasonably constitute the excess demand on the market. The note arrives at the conclusion that in models with a market maker the story of the maximization of expected wealth should be dropped

Light Front Quantisation of Gauge Theories in a Finite Volume

We discuss the light-front formulation of SU(2) Yang-Mills theory on a torus. The gauge choice we use allows for an exact and unambiguous solution of Gauss's law.Comment: 4 pages, Latex; talk presented at QCD 94, Montpellier, France, July 7-13, and at the Fourth International Workshop on Light Cone Quantization and Non- Perturbative Dynamics, Polana Zgorzelisko, Poland, August 15-25, TPR 94-2

Laser Doppler velocity simulator

A method and apparatus for inducing a Doppler frequency shift in a reference beam laser velocimeter light beam to simulate target velocity are described. The light beam is passed through a rotating refractive transparent block positioned between two reference points along the beam which results in a continuous change in the light beam optical path length between the reference points according to a known function. The velocity indicated by the laser velocimeter is compared to the known simulated velocity function for velocimeter testing and calibration

Visual alignment aid

Device consists of beam-splitter cube and two 90 deg prisms cemented together. Various components can be made as two pieces, eliminating seams, except beam-splitter diagonal