130,816 research outputs found
Implementation of a bidimensional compressor for a high-energy physics experiment
No full textCARLOSv3 is the third version of a chip that plays a significant role in the data acquisition chain of the A Large Ion Collider Experiment (ALICE) silicon drift detector (SDD). ALICE is one of the foremost high-energy physics experiments (HEPE) conducted within the Large Hadron Collider at CERN, the European Organization for Nuclear Research in Geneva. CARLOSv3 was principally designed and built for the on-line compression of the input dataset originating from a physical bidimensional silicon sensor. To compress a bidimensional dataset, a bidimensional data compressor was required. The compressor was designed for the ALICE SDD Experiment but could be applied to all experiments in which an incoming stream dataset originates from a bidimensional sensor. (20 refs)
Evaluation of a wavelet-based compression algorithm applied to the silicon drift detectors data of the ALICE experiment at CERN
No full textThis paper evaluates the performances of a wavelet-based compression algorithm applied to the data produced by the silicon drift detectors of the ALICE experiment at CERN. This compression algorithm is a general purpose lossy technique, in other words, its application could prove useful even on a wide range of other data reduction's problems. In particular the design targets relevant for our wavelet- based compression algorithm are the following ones: a high- compression coefficient, a reconstruction error as small as possible and a very limited execution time. Interestingly, the results obtained are quite close to the ones achieved by the algorithm implemented in the first prototype of the chip CARLOS, the chip that will be used in the silicon drift detectors readout chain
Design and Construction of an ALICE SDD End-Ladder Prototype Board
No full textThe paper explains the design and the construction of a
prototype of an End_Ladder card for the ALICE SDD experiment.
The final End_ladder card will receive an input dataset from the
front-end electronics and will transmit the elaborated dataset
through an optical channel to the counting room. The proposed
prototype card includes an actual ALICE SDD End_ladder
prototype card with all the components foreseen for the final
version. This is designed together with an external larger card with
all the testing equipment required for measurements in lab. The
End-Ladder card matches the final dimensions while the external
larger one provides all the connectors and an optical receiver
mirror unit for an easy-to-use complete system. The final optical
modules are provided into the End_Ladder prototype card and are
composed of 2-photodiodes and 1-laser single-mode 1310nm with
their single mode fibers. Once the front end dataset enters the
prototype, a small size digital rad-hard chip caries out a
bidimensional compression and acts as a JTAG switch for the front
end electronics. The incoming dataset is then compressed, packed,
serialized and output via a 800Mb/s optical link to the external
receiver card of the prototype. The mirror receiver card deserializes
the stream and re-constructs the original dataset before
being compressed
Test of the end-ladder prototype board of the ALICE SDD experiment
No full textThe paper presents an end-ladder card prototype of
the data acquisition chain of the ALICE SDD experiment. The
prototype includes most of the electronics devices that will be
applied to ALICE SDD experiment. The card interfaces with
the front-end electronics and with the counting room detector
data link via the interface card named CARLOS_rx. The
end_ladder PCB has been fully tested by providing control
signals and input vectors via a pattern generator and by
collecting output data via the detector data link
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
Design and Realization of an ALICE SDD End-Ladder Prototype
No full textThe paper presents the last version of a rad-hard digital
chip together with a full end-ladder card prototype of the data
acquisition (DAQ) chain of the ALICE SDD experiment. The
chip has been designed and constructed using a rad-hard
digital library provided by CERN. The end-ladder card
includes all the electronic devices foreseen for the DAQ chain
of ALICE SDD experiment. Moreover the card interfaces with
the front-end electronics and with the counting room detector
data link (DDL). Particularly, the end-ladder card prototype
has been designed taking into account the constraints on the
dimensions of the final apparatus
Design, Realization and Test of a Rad-Hard 2D-compressor and Packing Chip for High Energy Physics Experiments
No full textCARLOSv3 is a third version of a chip that plays a significant role in the data acquisition chain of the A Large Ion
Collider Experiment Inner Tracking System experiment. It has been designed and realized with a 0.25 mm CMOS 3-metal rad-hard digital library. The chip elaborates and compresses, by means of a bi-dimensional compressor, data belonging to a so-called event. The compressor looks for cross-shaped clusters within the whole data set coming from the silicon detector. To test the chip a specific PCB has been designed; it contains the connectors for probing the ASIC
with a pattern generator and a logic state analyzer. The chip is inserted on the PCB using a ZIF socket. This allows to test the 35 packaged samples out of the total amount of bare chips we have from the foundry. The test phase has shown that 32 out of 35 chips under test work well. It is planned to redesign a new version of the chip by adding extra features and to submit the final version of CARLOS upon the final DAQ chain will be totally tested both in Bologna and at CERN
Effetti delle metodologie di applicazione dei fungicidi nella protezione della vite da Uncinula necatrix (Schw) Burr
No full textDesign and Construction of an End-Ladder Prototype Board with a 2D HW compressor
No full textThis paper explains the design and the construction of
the prototype of an end-ladder card for the silicon drift detector of
a high-energy physics experiment at CERN. The end-ladder performs
data reduction, compression, and packing for a data acquisition
chain. In particular, the end-ladder card includes a chip whose
main function is to execute these tasks. Besides the chip’s functions,
the end-ladder card interfaces with the front-end electronics and
processes and transmits the data set received from the front end
through an optical channel to the counting room. The paper also
describes this chip and the ongoing tests on its production. In addition,
the paper shows details of the end-ladder prototype card’s
design and of the relative tests that are going to be carried out in
the near future
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