13,007 research outputs found
Wavelength-shifting light traps for SWGO and other applications
Wavelength-shifting (WLS) materials contain molecules that absorb light and
reemit at longer wavelengths. They can be used for light detection because they
provide a large effective area for low cost and they are able to efficiently
trap and guide light because of total internal reflection processes. We are
currently developing such a WLS detector, considering two main designs: A
single-shift design with one wavelength shift (tile) and a double-shift design
with two wavelength shifts (tile and fiber). As photodetectors we use small
Silicon photomultipliers (SiPMs) with a high photon detection efficiency (PDE)
and single-photon sensitivity. The double-shift layout goes at the expense of
detection efficiency. In this design however, light is channeled to the two
ends of a fiber, thus requiring a reduced photosensitive area compared to the
single-shift layout. We will present the results of our measurements and show
that light traps and SiPMs together represent a promising alternative to PMTs
in case of a non-focused light beam. For the special case of SWGO, the
application of light traps is also motivated by a possible improvement of the
gamma/hadron separation, using a one-chamber tank with an array of
wavelength-shifting light traps instead of a (two-chamber) tank with PMTs.
Besides SWGO, new WLS detectors could also constitute useful and cheap
technology for other experiments and use cases. The contribution summarizes our
motivation and efforts to build a light trap detection module and to
characterize its properties in terms of costs, temporal performance and
detection efficiency.Comment: 8 pages, 9 figures, Presented at the 38th International Cosmic Ray
Conference (ICRC 2023), 202
Effect of temperature and phosphorus fertilization on phosphorus and nitrogen uptake by sorghum
A possible solution for dinamically managing virtual environments
In modern distributed computer systems (clusters and computing GRIDs) a new class of problems, due to the increasing heterogeneity of users’ needs, have to be tackled by the administrators. One possible solution is to create ondemand virtual working environments tailored on the user’s requirements. Hence the need for an architecture to manage dynamically such environments. In this work we propose a possible solution based on the use of Virtual Machines (Xen), the implementation of a Virtual Machine Manager, capable of creation, destruction and migration of the virtualized working environments. The information will be collected using a client-server mechanism, to allow the manager to deploy preconfigured Virtual Machines on the available hardware resources. When a new execution
environment became active, it is automatically recognized by the Batch System Manager and is then ready to be used
Influenza della varietà e dell’epoca di semina sulla traslocazione della sostanza secca in Hordeum vulgare var. distichum L.
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