2,440 research outputs found
An Experimental Prototype for Multistatic Asynchronous ISAC
No full textWe prototype and validate a multistatic millimeter-wave (mmWave) Integrated Sensing And Communication (ISAC) system based on IEEE 802.11ay. Compensation of the clock asynchrony between each transmitter (TX) and receiver (RX) pair is performed using the sole line-of-sight (LoS) wireless signal propagation. As a result, our system provides concurrent target tracking and micro-Doppler (μD) estimation from multiple points of view, paving the way for practical multistatic data fusion. Our results on human movement sensing, complemented with precise, quantitative ground-truth (GT) data, demonstrate the enhanced sensing capabilities of multistatic ISAC, due to the spatial diversity of the RX nodes
Interlayer stress absorbing composite (ISAC) for mitigating reflection cracking in asphalt concrete overlays
No full text"This study deals with the design of a composite material which could effectively alleviate/mitigate the problem of reflection cracking in an AC overlay. After reviewing various case histories and having identified the problem areas in the treatments currently in use, a composite material consisting of two geotextile layers containing a thin viscoelastic rubber asphalt layer named, ""Interlayer Stress Absorbing Composite (ISAC)"" was proposed."To approach the design problem of the ISAC system effectively properties of the materials intended to be used in the system were first identified. Various models and laboratory testing procedures were used for this purpose. A Climate-Materials-Structural (CMS) pavement model was used to establish the pavement temperature range in Northern Illinois. A number of geotextiles were selected and tested for their engineering properties. Several samples of rubber asphalt were prepared by blending various ratios of crumb rubber with different types and ratios of asphalt cements. These materials were tested at different temperatures and the effects of temperature and rate of deformation on stiffness were investigated."After having selected the materials suitable for the ISAC system, based on their properties, a prototype ISAC system was fabricated in the laboratory and was then checked against slippage under an overlay with a vehicle making a sharp turn or applying sudden brakes. The computer program ""CIRCLY"" was used for this purpose. Testing equipment was developed to evaluate the interfacial shear strength and laboratory testing was performed to determine the shear strength of the fabricated ISAC layer under an AC overlay. Required stiffens was achieved in the ISAC core material by adding hydrated lime in the rubber asphalt."After completion of the component property testing program, the ISAC layer was fabricated and prepared for laboratory evaluation. A testing device was developed in the laboratory that simulated field conditions to evaluate an AC overlay over a cracked PCC slab with and without an ISAC system. The performance of the ISAC system was evaluated by comparing crack growth in the overlay of a control pavement section with that in an overlay over the ISAC treated PCC slab.Made available in DSpace on 2011-05-07T12:29:42Z (GMT). No. of bitstreams: 2
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A decision theory approach to standing order procurement of NASA reports
No full textExplains various package deal procurement methods including standing order method for library documents. Enumerates different standing order services of NTIS for technical reports. Describes the NASA information system. Discusses and analyses the economy of NASA FS service by applying decision theory approach and considering the various costs as well as saving aspects/advantages. Explains the non-economic factors to be considered in evaluating such a service. Suggests ways of making NASA FS service more beneficial to the library of ISRO Satellite Centre (ISAC)
Report on future evolution of sunshine duration and solar radiation over Sicily - Work package : WP6 – ENERGY – TASK 6.6 : past and future solar radiation estimation for Sicily
No full textThis report describes the activities performed by ISAC-CNR to produce Deliverable 6.13 of the
ECLISE Project - Future evolution of sunshine duration and solar radiation over Sicily. These activities
were performed within task 6.6 - Past and future solar radiation estimation for Sicily that also allowed
producing Deliverable 6.12 - Climatology of sunshine duration and solar radiation for Sicily. Both
deliverables were produced on the basis of SIAS (Servizio Informativo Agrometeorologico Siciliano,
one of the users of the ECLISE Project) needing. The deliverable mainly consists of maps reporting
monthly solar radiation climatologies for a number of time periods of 1961-2100 interval
Fluid Antenna-Assisted ISAC Systems
No full textThis letter proposes a fluid antenna-assisted integrated sensing and communication (ISAC) system, where a base station (BS) transmits signals to a communication user (CU) while sensing a target. Unlike traditional ISAC systems with fixed-position antennas (FPAs), fluid antennas are equipped at the BS and CU, and can be dynamically adjusted within a given area. Our objective is to jointly optimize the transmit beamforming and the locations of fluid antennas at the BS and CU to maximize the downlink communication rate while ensuring the requirements of the sensing beampattern gain and transmit power of the BS. Due to the non-convex nature of the original problem and the high coupling between variables, we employ an alternating optimization (AO) algorithm, dividing it into three subproblems and transforming them into convex ones for solution. Simulation results confirm that our proposed system significantly improves the performance of ISAC systems compared to benchmarks
Radioactive ion beam post-acceleration at ISAC
No full textISAC at TRIUMF is a world-class facility for the production and post-acceleration of radioactive ion beams (RIB).
Commissioned in 2002 the ISAC I linear accelerator serves three different beam lines delivering
both stable and radioactive species.
Two of them are permanent experiments (DRAGON and TUDA); the third one is a general purpose station (GPS).
The maximum energy we can reach in ISAC I is 1.8 MeV/u.
ISAC II is a phased upgrade of the ISAC facility. The beam coming from ISAC I is injected at 1.5 MeV/u into
a new superconducting LINAC. In `Phase I' the LINAC adds 20 MV to the beam energy
and 20 MV more will be added in `Phase II'.
The paper will give an overview of both the ISAC I and ISAC II accelerators.
Operational experience with accelerating RIBs in ISAC I is summarized.
First ISAC II commissioning results are presented
Report on future evolution of Eastern Sicily heavy precipitation events and their spatial distribution : ECLISE : Enabling climate information services for Europe. Work package: WP4: Cities. TASK 4.4: Flood risk assessment in cities of Eastern Sicily
No full textThis report describes the activities performed by ISAC-CNR to produce Deliverable 4.6 of the ECLISE Project –Report on future evolution of Eastern Sicily heavy precipitation events and their spatial distribution. These activities were performed within task 4.4 -Flood risk assessment in cities of Eastern Sicily that also allowed producing deliverable 4.5 –Report on past heavy recipitation events for the eastern part of Sicily . Deliverable 4.6 was produced in order to fulfil SIAS (Servizio Informativo
Agrometeorologico Siciliano, Sicily Regional Administration ) needs. SIAS is one of the users of the ECLISE Project.
The activities we developed in the frame of task 4.4 went far beyond the planned goal of the project, which focused only on inte
nse precipitation in eastern Sicily: we extended in fact the activities to the whole Sicily region
Report on future evolution of sunshine duration and solar radiation over Sicily. Project ECLISE (Enabling CLimate Information Services for Europe) - RESEARCH REPORT - Work package: WP6 – ENERGY – TASK 6.8: Future energy demand in Italy
No full textThis report describes the activities performed by ISAC-CNR to produce Deliverable 6.17 of the ECLISE Project – High-resolution estimates of 2030-2060 summer temperatures. These activities were performed within task 6.6 - Future energy demand in Italy that also allowed producing deliverable 6.16 – High-resolution gridded temperature dataset over Italy for the past 5 decades. Deliverable 6.17 was produced in order to fulfil RSE (Ricerca sul Sistema Energetico, one of the users of the ECLISE Project) needing. The estimated high-resolution future temperatures were used as input data of a model, developed in cooperation with RSE, in order to assess the impact of temperature on Italian electricity demand. The application of the model to scenario data allowed investigating the sensibility of the present-day electricity demand to climate variability and change
Six Integration Avenues for ISAC in 6G and Beyond
No full textIntegrated sensing and communication (ISAC) is a key technology for future 6G networks, enabling sensing and communication services by exploiting a single piece of equipment and waveform. This article introduces six novel integration strategies to enhance ISAC performance and unlock new applications, assuming a communication-centric approach. These include integrating multiple network elements, such as base stations (BSs) and user devices, to improve sensing accuracy and spatial resolution through coherent and incoherent processing. Multiband ISAC is also explored, highlighting the advantages of diverse frequency bands for optimized sensing and communication. We also discuss the potential of combining data from multiple network sensing configurations, terrestrial and nonterrestrial, and also including standalone sensors. The integration of data-driven and model-based methodologies is also discussed as an avenue to overcome limitations in the models and the methods exploited in conventional ISAC solutions. Cutting-edge hardware, including intelligent surfaces and metasurface antennas, is examined for its potential to revolutionize ISAC capabilities. Finally, we outline the challenges and future directions in achieving a fully integrated ISAC network, where sensing data drive network operations for enhanced efficiency and autonomy
On a Problem of G. Isac and Th. M. Rassias Concerning the Stability of Mappings
No full textAbstractWe give an answer to a problem of G. Isac and Th. M. Rassias concerning Hyers–Ulam–Rassias stability of the linear mappings. A new characterization of ψ-additive mappings is also given
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