104 research outputs found
The Gigabit Optical Transmitters for the LHCb Calorimeters
This report presents the boards developed for the optical data transmission of the calorimeter system of the LHCb experiment and test results. We developed two types of transmission boards: the single-channel and the multi-channel ones. Multi-channel boards can be equipped with a variable number of transmitters, depending on the need, with a maximum allowed of 12 channels. Each optical channel allows transmitting 32 bit data at 40.08 MHz. The boards have been designed and built using radiation hard devices produced at CERN. The optical links have been qualified using the eye diagram and the BERT at 1.6Gbps
Data transmission and selection for the L0 calorimeter trigger of LHCb
This report describes the optical transmitter boards and the Selection Crate, designed by the Bologna INFN-LHCb group, for the data transmission and the L0 calorimeter trigger of the LHCb experiment. The optical transmitters are used throughout the calorimeter system for data acquisition and the data transmission to the L0 trigger system. The optical transmitters allow transmitting 32 bit at the LHC clock of 40.08 MHz on a single fibre. The Selection Crate (SC) is used to select the most energetic deposits detected by the electromagnetic and the hadron calorimeters of LHCb, as well as to evaluate other auxiliary global trigger quantities (i.e. the total energy released and the hit multiplicity). The Selection Crate is a modular system equipped with homogeneous Selection Boards
IDIOPATHIC PARTIAL EPILEPSY WITH AUDITORY FEATURES (IPEAF): A CLINICAL AND GENETIC STUDY OF 53 SPORADIC CASES
The purpose of our study was to describe the clinical characteristics of sporadic
(S) cases of partial epilepsy with auditory features (PEAF) and pinpoint
clinical, prognostic and genetic differences with respect to previously reported
familial (F) cases of autosomal dominant partial epilepsy with auditory features
(ADPEAF). We analysed 53 patients (24 females and 29 males) with PEAF diagnosed
according to the following criteria: partial epilepsy with auditory symptoms,
negative family history for epilepsy and absence of cerebral lesions on NMR
study. All patients underwent a full clinical, neuroradiological and
neurophysiological examination. Forty patients were screened for mutations in
LGI1/epitempin, which is involved in ADPEAF. Age at onset ranged from 6 to 39
years (average 19 years). Secondarily generalized seizures were the most common
type of seizures at onset (79%). Auditory auras occurred either in isolation
(53%) or associated with visual, psychic or aphasic symptoms. Low seizure
frequency at onset and good drug responsiveness were common, with 51% of patients
seizure-free. Seizures tended to recur after drug withdrawal. Clinically, no
major differences were found between S and F patients with respect to age at
onset, seizure frequency and response to therapy. Analysis of LGI1/epitempin
exons failed to disclose mutations. Our data support the existence of a peculiar
form of non-lesional temporal lobe epilepsy closely related to ADPEAF but without
a positive family history. This syndrome, here named IPEAF, has a benign course
in the majority of patients and could be diagnosed by the presence of auditory
aura. Although LGI1 mutations have been excluded, genetic factors may play an
aetiopathogenetic role in at least some of these S cases
Search for the Flavor-Changing Neutral Current Decay with the HERA-B Detector
We report on a search for the flavor-changing neutral current decay using events recorded with a dimuon trigger in
interactions of 920 GeV protons with nuclei by the HERA-B experiment. We find
no evidence for such decays and set a 90% confidence level upper limit on the
branching fraction .Comment: 17 pages, 4 figures (of which 1 double), paper to be submitted to
Physics Letters
Measurement of the J/Psi Production Cross Section in 920 GeV/c Fixed-Target Proton-Nucleus Interactions
The mid-rapidity (dsigma_(pN)/dy at y=0) and total sigma_(pN) production
cross sections of J/Psi mesons are measured in proton-nucleus interactions.
Data collected by the HERA-B experiment in interactions of 920 GeV/c protons
with carbon, titanium and tungsten targets are used for this analysis. The
J/Psi mesons are reconstructed by their decay into lepton pairs. The total
production cross section obtained is sigma_(pN)(J/Psi) = 663 +- 74 +- 46
nb/nucleon. In addition, our result is compared with previous measurements
The electromagnetic calorimeter of the HERA-B experiment
The electromagnetic calorimeter of the HERA-B experiment built at the HERA proton accelerator at DESY (Hamburg) is described. The construction characteristics of the detector, of the related front-end, readout, trigger and service electronics are discussed together with the constraints and the motivations which inspired the design philosophy. The detector performance are presented as obtained from the analysis of the data acquired during the HERA-B running period, including calibration procedures and achievements and the electron identification capability exploiting a method, proposed here for the first time, based on the observation of the associated bremsstrahlung γ. Finally, some observed physical signals and a short overview of the main obtained physics results are presented
Ideazione, progettazione ed ottimizzazione di un supporto modulare per scale per interni
L\u2019obbiettivo principale del presente lavoro consta nell\u2019ideazione, progettazione, modellazione, ottimizzazione e analisi ad elementi finiti di un supporto modulare per scale per interni, regolabile in altezza e in lunghezza in accordo con le specifiche fornite dall\u2019azienda committente.
Il contributo innovativo del lavoro consiste nel garantire la possibilit\ue0 di comporre un\u2019ampia gamma di tipologie di scale prefabbricate nel modo pi\uf9 vario possibile a partire dagli stessi componenti standard di base permettendo, contemporaneamente, significative variazioni nelle dimensioni della pedata e dell\u2019alzata, con possibilit\ue0 di regolazione diretta durante il montaggio
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