59 research outputs found
The Acute Renal and Cerebral Toxicity of Lithium: a Cerebro-renal Syndrome? A Case Report
No full textA TRANSPUTER-BASED LIST MODE PARALLEL SYSTEM FOR DIGITAL RADIOGRAPHY WITH 2D SILICON DETECTORS
No full textWe believe that a dedicated parallel computer system can represent an effective and flexible approach to the problem of 'list mode' acquisition and reconstruction of digital radiographic images obtained with a double-sided silicon microstrip detector. We present a Transputer-based implementation of a parallel system for the data acquisition and image reconstruction from a silicon crystal with 200 mum read-out pitch. We are currently developing a prototype of the system connected to a detector with a 10 mm2 sensitive area
A transputer-based 'list mode' parallel system for digital radiography with 2D silicon detectors
No full textThe authors believe that a dedicated parallel computer system can represent an effective and flexible approach to the problem of list mode acquisition and reconstruction of digital radiographic images obtained with a double-sided silicon microstrip detector. They present a transputer-based implementation of a parallel system for data acquisition and image reconstruction from a silicon crystal with 200 μm read-out pitch. They are currently developing a prototype of the system connected to a detector with a 10 mm2 sensitive are
Interpreting B anomalies within an extended 331 gauge theory
No full textIn light of the recent RK(∗) data on neutral current flavor anomalies in B→K(∗)l+l- decays, we reexamine their quantitative interpretation in terms of an extended 331 gauge theory framework. We achieve this by adding two extra lepton species with novel 331 charges, while ensuring that the model remains anomaly-free. In contrast to the canonical 331 models, the gauge charges of the first and second lepton families differ from each other, allowing lepton-flavor universality violation. We further expand the model by adding the neutral fermions required to provide an adequate description for small neutrino masses
A cloud based architecture to support Electronic Health Record
No full textWe introduce a novel framework of electronic healthcare enabled by a Cloud platform able to host both Hospital Information Systems (HIS) and Electronic Medical Record (EMR) systems and implement an innovative model of Electronic Health Record (EHR) that is not only patient-oriented but also supports a better governance of the whole healthcare system.
The proposed EHR model adopts the state of the art of the Cloud technologies, being able to join the different clinical data of the patient stored within the HISs and EMRs either placed into a local Data Center or hosted into a Cloud Platform enabling new directions of data analysis
Modular Data-acquisition System Based On Transputer Technology For Bi-dimensional Time Coincidence Counting
No full textWe describe the rationale and the test of a modular Data AcQuisition system (DAQ) for bi-dimensional (X-Y) digital imaging, based on a 16 channel Time-to-Digital Converter (TDC) NIM module connected to a specially designed TRAnsputer Module (TRAM). TDC time resolution is 12.5 ns (LSB) with a 40 MHz clock, time range is 3.3 s (28 bits), for a maximum rate of 500 kHz/channel guaranteed. The TDC + TRAM pair is the basic unit that can be scaled in modules of 8X + 8Y channels to meet the user's requirement for a larger number of X-Y channels to be considered simultaneously. TDC directly accesses the large RAM memory (32 Mbytes) of the INMOS T805 (20 MHz) transputer on the TRAM board. Each transputer in the modular system is a node of a ring network, whose root transputer node is hosted in a i386-based personal computer. After real-time data acquisition, a parallel reconstruction algorithm resolves time coincidences. Laboratory tests give a reconstruction time of 6.2 s for 1.28 10(5) events on 16 X + 16 Y channels (2 TDC + 2 TRAM), obtained in 1 s with a fluence of 5 X 10(4) events/mm2 (typically used in radiological imaging) on an area of 1.6 X 1.6 MM2
Assessment of Mission Capabilities of a Reusable Heavy-lift Launch Vehicle Concept with Aerospike Engine
No full textThis study investigates the application of Advanced Nozzles to Reusable Launch Vehicles
(RLVs) through Mission Analysis, MDO and GNC Missionisation tools for autonomous re-entry
vehicles. In this context, it is offered an assessment of Mission and Recovery Capabilities for an
adapted version of RETALT1, an European VTVL-RLV concept (H2020 project) in the class
of heavy-lift launch vehicles like SpaceX’s "Falcon 9" or European "Ariane 5". The original
vehicle is modified for this study with an annular aerospike engine concept, that substitutes
its conventional octa-web configuration. This study is based on the results obtained from
the RETALT project, fully available in Open Access for the exploitation of its investigated
technologies, including an experimental and numerical aerodynamic database. The collaboration
between TU Dresden and Deimos Space results in design of a novel aerospike concept tailored
to VTVL-RLVs in retro-propulsion scenarios and mission analysis for downrange-landing
scenarios, respectively. In detail, the Missionisation tool developed by Deimos Space, together
with CFD studies by TU Dresden for scaling the original AEDB for RETALT1 to its aerospike
version, provide an assessment of the mission performance with respect to the design parameters
and mission constraints previously defined for RETALT1. These results are delivered as Flying
Quality Analysis, Entry Corridor Analysis and Trajectory Optimisation. All of the previous are
then compared to the results of the original RETALT1 concept. This comparative offers a clear
picture of the applicability of an annular aerospike engine to a class of reusable vehicles similar
to "Falcon 9", together with impact on design parameters and mission constraints, performance
gains and propellant consumption, trajectory optimisation and vertical-landing manoeuvre.
This study lies within the ASCenSIon (Advancing Space Access Capabilities - Reusability and
Multiple Satellite Injection) project, an Innovative Training Network (ITN) funded within H2020
MODULAR DATA-ACQUISITION SYSTEM BASED ON TRANSPUTER TECHNOLOGY FOR BI-DIMENSIONAL TIME COINCIDENCE COUNTING
No full textWe describe the rationale and the test of a modular Data AcQuisition system (DAQ) for bi-dimensional (X-Y) digital imaging, based on a 16 channel Time-to-Digital Converter (TDC) NIM module connected to a specially designed TRAnsputer Module (TRAM). TDC time resolution is 12.5 ns (LSB) with a 40 MHz clock, time range is 3.3 s (28 bits), for a maximum rate of 500 kHz/channel guaranteed. The TDC + TRAM pair is the basic unit that can be scaled in modules of 8X + 8Y channels to meet the user's requirement for a larger number of X-Y channels to be considered simultaneously. TDC directly accesses the large RAM memory (32 Mbytes) of the INMOS T805 (20 MHz) transputer on the TRAM board. Each transputer in the modular system is a node of a ring network, whose root transputer node is hosted in a i386-based personal computer. After real-time data acquisition, a parallel reconstruction algorithm resolves time coincidences. Laboratory tests give a reconstruction time of 6.2 s for 1.28 10(5) events on 16 X + 16 Y channels (2 TDC + 2 TRAM), obtained in 1 s with a fluence of 5 X 10(4) events/mm2 (typically used in radiological imaging) on an area of 1.6 X 1.6 MM2
RLV applications: challenges and benefits of novel technologies for sustainable main stages
No full textWithin the scope of the European Green Deal, the aerospace industry is currently staking on sustainability. To fulfil the objectives and in order to ensure Europe's independent and cost-effective space access capabilities, the ASCenSIon (Advancing Space Access Capabilities - Reusability and Multiple Satellite Injection) project, funded by H2020, is connecting fifteen Early-Stage Researchers (ESRs) and twenty-four partner organizations all across Europe. The pillar concept within the project is to adopt a Concurrent Research Network (CRN) methodology. Accordingly, different host institutions, each one with its main research program and vision, are connected to develop the design under a new perspective. This approach emphasises the cooperation between the fifteen ESRs, thus covering the design of a Reusable Launch Vehicle (RLV) in its overall complexity, facing the new challenges deriving from the required sustainability in a more efficient manner. Corresponding to work package two (WP2) of ASCenSIon, this paper focuses on main stages for RLVs, and how the goal of sustainability affects their design. Therefore, many different interconnected disciplines, such as propulsion system, structural design, fatigue-life analysis and Health Monitoring (HM) have to be taken into consideration. These different domains are represented by the individual research projects of the ESRs, supported by a collaborative environment which promotes the foreseen interactions. At first, this contribution gives a general State-Of-The-Art overview of the mentioned topics. A preliminary trade-off on RLV architectures is established through multi-disciplinary design analysis and optimization methods based on propulsion modelling, optimal staging and structural sizing. These use performance and cost design metrics as objective functions, accounting for operability and maintainability factors. This investigation is then used to discuss the different Advanced Nozzle Concepts (ANCs) tailored on the system requirements and mission constraints. At this point, a one-dimensional performance analysis addresses the performance gain deriving from altitude-compensation properties of ANCs. Subsequently, the identification of a suitable green propellant will give the needed/accurate/required inputs to conduct a trade-off between engine cycles w.r.t. the fatigue-life of their most critical components. Consequently, fatigue-life analysis contributes to HM and sensing requirements for RLV systems. As a common approach between the ESRs, the data collection is organized in various Databases accessible within the network, which encourages their interconnections and collaborative research. This paper provides a preliminary analysis of the above discussed topics and their interconnections within the framework of ASCenSIon, aiming to develop novel technologies for future sustainable main stages
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