Kriteria Terjadinya Aliran Debris k. Ngobo, g. Kelud.

Angkutan material sungai gunung berapi yang dipandang besar daya perusaknya adalah angkutan material berupa aliran debris. Tahap awal untuk menganalisa aliran debris dimulai dengan mencari kriteria kapan terjadinya aliran tersebut. Suatu metoda yang dikemukakan oleh Takahashi digunakan untuk menetapkan kriteria terjadinya aliran debris pada K. Ngobo, G. Kelud

The BaBar Experiment’s Distributed Computing Model

Dominique Boutigny LAPP-CNRS/IN2P3 on behalf of the BaBar Collaboration’s Computing Group In order to face the expected increase in statistics between now and 2005, the BaBar experiment at SLAC is evolving its computing model toward a distributed multi-tier system. It is foreseen that data will be spread among Tier-A centers and deleted from the SLAC center. A uniform computing environment is being deployed in the centers, the network bandwidth is continuously increased and data distribution tools has been designed in order to reach a transfer rate of ~100 TB of data per year. In parallel, smaller Tier-B and C sites receive subsets of data, presently in Kanga-ROOT[1] format and later in Objectivity[2] format. GRID tools will be used for remote job submission.

Altruism during predation in an assassin bug

Zelus annulosus is an assassin bug species mostly noted on Hirtella physophora, a myrmecophyte specifically associated with the ant Allomerus decemarticulatus known to build traps on host tree twigs to ambush insect preys. The Z. annulosus females lay egg clutches protected by a sticky substance. To avoid being trapped, the first three instars of nymphs remain grouped in a clutch beneath the leaves on which they hatched, yet from time to time, they climb onto the upper side to group ambush preys. Long-distance prey detection permits these bugs to capture flying or jumping insects that alight on their leaves. Like some other Zelus species, the sticky substance of the sundew setae on their forelegs aids in prey capture. Group ambushing permits early instars to capture insects that they then share or not depending on prey size and the hunger of the successful nymphs. Fourth and fifth instars, with greater needs, rather ambush solitarily on different host tree leaves, but attract siblings to share large preys. Communal feeding permits faster prey consumption, enabling small nymphs to return sooner to the shelter of their leaves. By improving the regularity of feeding for each nymph, it likely regulates nymphal development, synchronizing molting and subsequently limiting cannibalism

COMMISSIONING OF THE FERMILAB ELECTRON COOLER PROTOTYPE BEAM LINE

Abstract A prototype of a 4.3-MeV electron cooling system is being assembled at Fermilab as part of the ongoing R&D program in high energy electron cooling. This electron cooler prototype will not demonstrate the actual cooling but it will allow determining if the electron beam properties are suitable for antiproton beam cooling. An electron beam is accelerated by a 5-MV Pelletron (Van de Graaff type) accelerator and transported to a prototype cooling section. The cooling will take place in a 20-m long solenoid flanked on both sides by a delivery and return beam-line -a total of 60 meters of transport channel. This paper describes the first results of commissioning this novel beam line as well as the status of the electron cooling R&D program

Proton - Nucleus Interactions at 200-GeV/c

The investigation of interactions of hadrons with the nucleus in recent time became very important, and there is a hope that it can give the information about the systems produced in this process (lifetime, cross sections etc.) The nuclear photoemulsions are a good detector at the investigation of hadron-nucleus interactions due to a high spatial resolution and a possibility of detection of particles nearly at all energies that enables to study the characteristics of both fast and slow particles. The consistence of emulsion enables to obtain the characteristics of interactions both on light (CNO, <A> = 14) and on heavy(Ag,Br,<A> = 94) nuclei