The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Julio Sanjuan - One of the best experts on this subject based on the ideXlab platform.
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on Ground Tests of the lisapathfinder thermal diagnostics system
Classical and Quantum Gravity, 2006Co-Authors: A Lobo, M Nofrarias, J Ramoscastro, Julio SanjuanAbstract:Thermal conditions in the LTP, the LISA Technology Package, are required to be very stable, and in such environments precision temperature measurements are also required for various diagnostics objectives. A sensitive temperature gauging system for the LTP is being developed at IEEC, which includes a set of thermistors and associated electronics. In this paper, we discuss the derived requirements applying to the temperature sensing system, and address the problem of how to create in the laboratory a thermally quiet environment, suitable for performing meaningful on-Ground Tests of the system. The concept is a two-layer spherical body, with a central aluminium core for sensor implantation surrounded by a layer of polyurethane. We construct the insulator transfer function, which relates the temperature at the core to the laboratory ambient temperature, and evaluate the losses caused by heat leakage through connecting wires. The results of the analysis indicate that, in spite of the very demanding stability conditions, a sphere of outer diameter of the order 1 m is sufficient. We provide experimental evidence confirming the model predictions.
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on Ground Tests of lisa pathfinder thermal diagnostics system
arXiv: General Relativity and Quantum Cosmology, 2006Co-Authors: A Lobo, M Nofrarias, J Ramoscastro, Julio SanjuanAbstract:Thermal conditions in the LTP, the LISA Technology Package, are required to be very stable, and in such environment precision temperature measurements are also required for various diagnostics objectives. A sensitive temperature gauging system for the LTP is being developed at IEEC, which includes a set of thermistors and associated electronics. In this paper we discuss the derived requirements applying to the temperature sensing system, and address the problem of how to create in the laboratory a thermally quiet environment, suitable to perform meaningful on-Ground Tests of the system. The concept is a two layer spherical body, with a central aluminium core for sensor implantation surrounded by a layer of polyurethane. We construct the insulator transfer function, which relates the temperature at the core with the laboratory ambient temperature, and evaluate the losses caused by heat leakage through connecting wires. The results of the analysis indicate that, in spite of the very demanding stability conditions, a sphere of outer diameter of the order one metre is sufficient. We provide experimental evidence confirming the model predictions.
Raoul Velazco - One of the best experts on this subject based on the ideXlab platform.
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Sensitivity to neutron radiation of a 45 nm SOI multi-core processor
2015Co-Authors: P. Ramos, V. Vargas, M. Baylac, F. Villa, S. Rey, J.a. Clemente, N.-e. Zergainoh, Raoul VelazcoAbstract:The purpose of this paper is to evaluate the SEU sensitivity of a multi-core SoC working in two different multiprocessing modes. Radiation Ground Tests were performed with 14 MeV neutrons in GENEPI2 facility. The case study was a 45nm SOI multi-core processor having implemented error correcting code (ECC) and parity in their cache memories.
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Reliability Limits of TMR Implemented in a SRAM-based FPGA: Heavy Ion Measures vs. Fault Injection Predictions
Journal of Electronic Testing, 2011Co-Authors: G. Foucard, P. Peronnard, Raoul VelazcoAbstract:This paper presents experimental results putting in evidence the potential weaknesses of a state-of-the-art fault tolerance strategy, the Triple Modular Redundancy (TMR), when implemented in SRAM-based FPGAs. HW/SW fault injection campaigns and accelerated radiation Ground Tests were performed to quantify the number of faults, Single Event Upsets (SEUs) required to obtain such critical failures.
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Radiation tolerance of a fuzzy controller
1998Co-Authors: Raoul Velazco, P. Cheynet, R. Ecoffet, K. Beck, L. Peters, S. Olmos, J.-c. Rubio, J. CabestanyAbstract:The sensitivity of a circuit dedicated to fuzzy control (the WARP 2.0 from SGS-Thomson) is investigated with respect to "single event upsets" caused by nuclear or space environments. The fuzzy control part of a future ESA Mars instrument deployment vehicle serves as a realistic test application. Software fault injection experiments and Ground Tests show the fault tolerance properties of the studied application.
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Artificial neural network robustness for on-board satellite image processing : results of SEU simulations and Ground Tests
1997Co-Authors: Raoul Velazco, P. Cheynet, J.d Muller, R. Ecoffet, S. BuchnerAbstract:Artificial neural networks have been shown to possess fault tolerant properties. We present the architecture of a neural network designed to process satellite images (SPOT photos). Soft simulations and Ground Tests performed on a digital implementation of this neural network prove its robustness with respect to bit errors.
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Artificial neural network robustness for on-board satellite image processing: results of upset simulations and Ground Tests
IEEE Transactions on Nuclear Science, 1997Co-Authors: Raoul Velazco, P. Cheynet, J.d Muller, R. Ecoffet, S. BuchnerAbstract:Artificial Neural Networks have been shown to possess fault tolerant properties. We present the architecture of a neural network designed to process satellite images (SPOT photos). Computer simulations and Ground Tests performed on a digital implementation of this neural network prove its robustness with respect to bit errors.
Jing Ming - One of the best experts on this subject based on the ideXlab platform.
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Research on Special Inflection Point of Solid Rocket Motor Test Data
Computer Simulation, 2013Co-Authors: Jing MingAbstract:Data curves of solid rocket motor Ground Tests' collection are so various with shapes that the special inflection points are difficult to depict in accordance with the rocket motor test data processing method(National Military Standard).To solve this problem,this paper raised a new method of calculating the special inflection point based on computational geometry theory.This method analyses the corresponding mathematical algorithm of rocket motor test data characteristic points,uses LabWindows/CVI to develop a rocket motor test data processing software,realizes quickly and accurately description of the special inflection point of the rocket motor data.The simulation results show that the method improves the accuracy and speed of data analysis.
A Lobo - One of the best experts on this subject based on the ideXlab platform.
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on Ground Tests of the lisapathfinder thermal diagnostics system
Classical and Quantum Gravity, 2006Co-Authors: A Lobo, M Nofrarias, J Ramoscastro, Julio SanjuanAbstract:Thermal conditions in the LTP, the LISA Technology Package, are required to be very stable, and in such environments precision temperature measurements are also required for various diagnostics objectives. A sensitive temperature gauging system for the LTP is being developed at IEEC, which includes a set of thermistors and associated electronics. In this paper, we discuss the derived requirements applying to the temperature sensing system, and address the problem of how to create in the laboratory a thermally quiet environment, suitable for performing meaningful on-Ground Tests of the system. The concept is a two-layer spherical body, with a central aluminium core for sensor implantation surrounded by a layer of polyurethane. We construct the insulator transfer function, which relates the temperature at the core to the laboratory ambient temperature, and evaluate the losses caused by heat leakage through connecting wires. The results of the analysis indicate that, in spite of the very demanding stability conditions, a sphere of outer diameter of the order 1 m is sufficient. We provide experimental evidence confirming the model predictions.
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on Ground Tests of lisa pathfinder thermal diagnostics system
arXiv: General Relativity and Quantum Cosmology, 2006Co-Authors: A Lobo, M Nofrarias, J Ramoscastro, Julio SanjuanAbstract:Thermal conditions in the LTP, the LISA Technology Package, are required to be very stable, and in such environment precision temperature measurements are also required for various diagnostics objectives. A sensitive temperature gauging system for the LTP is being developed at IEEC, which includes a set of thermistors and associated electronics. In this paper we discuss the derived requirements applying to the temperature sensing system, and address the problem of how to create in the laboratory a thermally quiet environment, suitable to perform meaningful on-Ground Tests of the system. The concept is a two layer spherical body, with a central aluminium core for sensor implantation surrounded by a layer of polyurethane. We construct the insulator transfer function, which relates the temperature at the core with the laboratory ambient temperature, and evaluate the losses caused by heat leakage through connecting wires. The results of the analysis indicate that, in spite of the very demanding stability conditions, a sphere of outer diameter of the order one metre is sufficient. We provide experimental evidence confirming the model predictions.
M Nofrarias - One of the best experts on this subject based on the ideXlab platform.
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on Ground Tests of the lisapathfinder thermal diagnostics system
Classical and Quantum Gravity, 2006Co-Authors: A Lobo, M Nofrarias, J Ramoscastro, Julio SanjuanAbstract:Thermal conditions in the LTP, the LISA Technology Package, are required to be very stable, and in such environments precision temperature measurements are also required for various diagnostics objectives. A sensitive temperature gauging system for the LTP is being developed at IEEC, which includes a set of thermistors and associated electronics. In this paper, we discuss the derived requirements applying to the temperature sensing system, and address the problem of how to create in the laboratory a thermally quiet environment, suitable for performing meaningful on-Ground Tests of the system. The concept is a two-layer spherical body, with a central aluminium core for sensor implantation surrounded by a layer of polyurethane. We construct the insulator transfer function, which relates the temperature at the core to the laboratory ambient temperature, and evaluate the losses caused by heat leakage through connecting wires. The results of the analysis indicate that, in spite of the very demanding stability conditions, a sphere of outer diameter of the order 1 m is sufficient. We provide experimental evidence confirming the model predictions.
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on Ground Tests of lisa pathfinder thermal diagnostics system
arXiv: General Relativity and Quantum Cosmology, 2006Co-Authors: A Lobo, M Nofrarias, J Ramoscastro, Julio SanjuanAbstract:Thermal conditions in the LTP, the LISA Technology Package, are required to be very stable, and in such environment precision temperature measurements are also required for various diagnostics objectives. A sensitive temperature gauging system for the LTP is being developed at IEEC, which includes a set of thermistors and associated electronics. In this paper we discuss the derived requirements applying to the temperature sensing system, and address the problem of how to create in the laboratory a thermally quiet environment, suitable to perform meaningful on-Ground Tests of the system. The concept is a two layer spherical body, with a central aluminium core for sensor implantation surrounded by a layer of polyurethane. We construct the insulator transfer function, which relates the temperature at the core with the laboratory ambient temperature, and evaluate the losses caused by heat leakage through connecting wires. The results of the analysis indicate that, in spite of the very demanding stability conditions, a sphere of outer diameter of the order one metre is sufficient. We provide experimental evidence confirming the model predictions.
