Positron Emission Tomography (PET) is a leading technique in medical diagnostic imaging. PET scanners are used to detect cancerous cells through the use of a positron emitting tracer that is ingested by the patient. The positron annihilates with an electron in the body producing a pair of 511keV gamma rays emitted in opposite directions. The gamma rays are sufficiently energetic to leave the pa...

I discuss the recent exciting results of discovery of TeV photons from several galactic and extra-galactic sources, and highlight some objectives of VHE gamma ray astronomy that can be achieved in the near future by means of new generation ground-based detectors.

It is easy for a theorist to talk about expectations for particle reactions at higher energies. He knows the answer: he will be wrong. Nevertheless, he is derelict in his duty if he doesn't try to guess. These days the word tTpredictionll is often meant to be the explanation of last year's experiments. We should strive for more, lest it be said that the science of high-energy physics is more ba...

Muon colliders might greatly extend the energy frontier of collider physics. One can contemplate circular colliders with center-of-mass energies in excess of 10 TeV. Some physics issues that might be relevant at such a machine are discussed.

Most source-level debuggers accept expressions in the source language, e.g., C, and can print sourcelanguage values. This approach is usually justi ed on grounds that programmers need to know only one language. But the evaluation of source-language expressions or even statements is poorly suited for making non-trivial queries about the program state, e.g., \which elements of array x[100] are po...

such that N is a solution to s of the congruences. (It is, of course, clear that no Ar can be a solution to more than s of the congruences (1).) Examples : On the one extreme there is the Sieve of Eratosthenes for finding all primes p in the range A = B12 ^ p < B, where ti = m, — 1 for all i. (Here to, are all the primes < Bl .) On the other extreme there is the Chinese remainder type of proble...

I briefly mention a few possible applications of very high spectral resolution spectroscopy with CRIRES to the study of nearby galaxies. This includes the fields of AGN, dynamically cold systems, super stellar and emission line clusters, and a more speculative program on the measurement of gravitational redshifts.

Linear collider (LC) interaction region beam sizes and component position stability requirements are expected to be a few nanometers[1]. It is important to show that the related tolerances can be achieved, with an electron beam if possible. Using recently developed component stabilization technology, very high-resolution beam position monitors (BPM’s), and the ultra-low emittance beam at the KE...

Multimedia databases typically contain data with very high dimensions. Finding interesting patterns in these databases poses a very challenging problem because of the scalability, lack of domain knowledge and complex structures of the embedded clusters. High dimensionality adds severely to the scalability problem. It has been shown that the wavelet-based clustering technique, WaveCluster, is ve...