The Experts below are selected from a list of 50667 Experts worldwide ranked by ideXlab platform
A. Turatsinze - One of the best experts on this subject based on the ideXlab platform.
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Effect of an enhanced rubber-cement matrix interface on freeze-thaw resistance of the cement-based composite
Construction and Building Materials, 2019Co-Authors: Ngoc Phuong Pham, Ahmed Toumi, A. TuratsinzeAbstract:Abstract Bond defects at rubber-cement matrix interface are detrimental to durability of the cement composite. Therefore, coating rubber aggregates with copolymer has been suggested to overcome this defect. This paper aims to investigate the effect of an improved rubber-cement matrix bond on frost resistance. Freeze-thaw temperature cycles were controlled by a Thermal Sensor embedded inside the core of a mortar specimen. Measurements of relevant quantities, such as mass loss, length change, mechanical properties (relative dynamic modulus of elasticity, compressive and flexural strengths), and durability factor, demonstrated that rubberized cement-based materials were more resistant under freeze-thaw environments than the control one. Especially, regardless of slight length gain of mortar incorporating coated rubber aggregates, copolymer coating still made the composite durable in frost conditions owing to its improved strain capacity and higher residual post-peak tensile strength.
Ngoc Phuong Pham - One of the best experts on this subject based on the ideXlab platform.
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Effect of an enhanced rubber-cement matrix interface on freeze-thaw resistance of the cement-based composite
Construction and Building Materials, 2019Co-Authors: Ngoc Phuong Pham, Ahmed Toumi, A. TuratsinzeAbstract:Abstract Bond defects at rubber-cement matrix interface are detrimental to durability of the cement composite. Therefore, coating rubber aggregates with copolymer has been suggested to overcome this defect. This paper aims to investigate the effect of an improved rubber-cement matrix bond on frost resistance. Freeze-thaw temperature cycles were controlled by a Thermal Sensor embedded inside the core of a mortar specimen. Measurements of relevant quantities, such as mass loss, length change, mechanical properties (relative dynamic modulus of elasticity, compressive and flexural strengths), and durability factor, demonstrated that rubberized cement-based materials were more resistant under freeze-thaw environments than the control one. Especially, regardless of slight length gain of mortar incorporating coated rubber aggregates, copolymer coating still made the composite durable in frost conditions owing to its improved strain capacity and higher residual post-peak tensile strength.
Joseph Shor - One of the best experts on this subject based on the ideXlab platform.
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a miniaturized 0 003 mm 2 pnp based Thermal Sensor for dense cpu Thermal monitoring
IEEE Transactions on Circuits and Systems I-regular Papers, 2020Co-Authors: Ori Bass, Joseph ShorAbstract:Compact integrated Thermal Sensors are utilized to measure hot / cold spots in CPU cores in multiple locations and are important for the power/performance of the chip. Bipolar junction transistors (BJT) are the industry standard for temperature sensing elements because of their predictable physics. This paper reports on one of the smallest PNP BJT bandgap based Thermal Sensors to date. Miniaturization was achieved by using switched capacitor circuits with very small capacitors as opposed to the standard resistor-based bandgaps. Digitally controlled trims enable either a higher resolution or a nearly linear response to temperature. This ultra-miniature 0.003 mm2, PNP Thermal- based Sensor is fabricated in TSMC 65nm. It achieves a measured total ${\pm 3\sigma }$ error of ±1.35°C with a resolution of 65mK and a 4.1ms conversion time. The Sensor is optimized for dense CPU Thermal mapping.
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compact bjt based Thermal Sensor for processor applications in a 14 nm tri gate cmos process
IEEE Journal of Solid-state Circuits, 2015Co-Authors: Takao Oshita, Joseph Shor, D Duarte, Avner Kornfeld, Dror ZilbermanAbstract:Compact Thermal Sensors ( 50 kS/sec, consumes 1.1 mW with a resolution of 0.5 °C, and has a resolution FOM of 5.7 nJ * C 2 . It is very close to the present BJT Sensor state-of-the-art in its size, while being much faster and having a much better FOM than any of the compact BJT Sensors.
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Miniaturized BJT-Based Thermal Sensor for Microprocessors in 32- and 22-nm Technologies
IEEE Journal of Solid-State Circuits, 2013Co-Authors: Joseph Shor, Kosta LuriaAbstract:A Thermal Sensor is proposed for microprocessors, which compares the BJT voltage to a reference by converting both voltages to frequency and dividing the frequencies to result in a digital number. The Sensor has an rms resolution of ±0.2C and an area of 0.02 mm2 at the 32-nm process node and 0.006 mm2 at 22 nm, including all digital processing circuitry. The conversion rate is between 2-20 kS/s, which enables it to capture fast transients on the CPU. It consumes 3.8/1.4 mW at 32/22 nm from an unregulated 1.4-V supply. The combination of speed, low power, and area make this Sensor appropriate to measure hot-spots in microprocessors.
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Miniaturized CMOS Thermal Sensor array for temperature gradient measurement in microprocessors
Proceedings of 2010 IEEE International Symposium on Circuits and Systems, 2010Co-Authors: Kosta Luria, Joseph ShorAbstract:A miniaturized Thermal Sensor for use in Intel's microprocessors has been demonstrated in a cutting-edge purely digital process. The circuit shows nearly linear frequency dependence with temperature of 45kHz/°C. The circuit occupies 3.75 × 10-3 mm2 and consumes a current of ~700uA, which makes it suitable to be placed in array on a microprocessor to measure Thermal gradients across the die.
Bernd Gotsmann - One of the best experts on this subject based on the ideXlab platform.
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Thermal radiative near field transport between vanadium dioxide and silicon oxide across the metal insulator transition
Applied Physics Letters, 2016Co-Authors: Fabian Menges, Matthias Dittberner, Lukas Novotny, Donata Passarello, S S P Parkin, Martin Spieser, Heike Riel, Bernd GotsmannAbstract:The Thermal radiative near field transport between vanadium dioxide and silicon oxide at submicron distances is expected to exhibit a strong dependence on the state of vanadium dioxide which undergoes a metal-insulator transition near room temperature. We report the measurement of near field Thermal transport between a heated silicon oxide micro-sphere and a vanadium dioxide thin film on a titanium oxide (rutile) substrate. The temperatures of the 15 nm vanadium dioxide thin film varied to be below and above the metal-insulator-transition, and the sphere temperatures were varied in a range between 100 and 200 °C. The measurements were performed using a vacuum-based scanning Thermal microscope with a cantilevered resistive Thermal Sensor. We observe a Thermal conductivity per unit area between the sphere and the film with a distance dependence following a power law trend and a conductance contrast larger than 2 for the two different phase states of the film.
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Thermal radiative near field transport between vanadium dioxide and silicon oxide across the metal insulator transition
arXiv: Strongly Correlated Electrons, 2015Co-Authors: Fabian Menges, Matthias Dittberner, Lukas Novotny, Donata Passarello, S S P Parkin, Martin Spieser, Heike Riel, Bernd GotsmannAbstract:The Thermal radiative near field transport between vanadium dioxide and silicon oxide at submicron distances is expected to exhibit a strong dependence on the state of vanadium dioxide which undergoes a metal-insulator transition near room temperature. We report the measurement of near field Thermal transport between a heated silicon oxide micro-sphere and a vanadium dioxide thin film on a titanium oxide (rutile) substrate. The temperatures of the 15 nm vanadium dioxide thin film varied to be below and above the metal-insulator-transition, the sphere temperatures were varied in a range between 100 and 200 Celsius. The measurements were performed using a vacuum-based scanning Thermal microscope with a cantilevered resistive Thermal Sensor. We observe a Thermal conductivity per unit area between the sphere and the film with a distance dependence following a power law trend and a conductance contrast larger than 2 for the two different phase states of the film.
Ahmed Toumi - One of the best experts on this subject based on the ideXlab platform.
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Effect of an enhanced rubber-cement matrix interface on freeze-thaw resistance of the cement-based composite
Construction and Building Materials, 2019Co-Authors: Ngoc Phuong Pham, Ahmed Toumi, A. TuratsinzeAbstract:Abstract Bond defects at rubber-cement matrix interface are detrimental to durability of the cement composite. Therefore, coating rubber aggregates with copolymer has been suggested to overcome this defect. This paper aims to investigate the effect of an improved rubber-cement matrix bond on frost resistance. Freeze-thaw temperature cycles were controlled by a Thermal Sensor embedded inside the core of a mortar specimen. Measurements of relevant quantities, such as mass loss, length change, mechanical properties (relative dynamic modulus of elasticity, compressive and flexural strengths), and durability factor, demonstrated that rubberized cement-based materials were more resistant under freeze-thaw environments than the control one. Especially, regardless of slight length gain of mortar incorporating coated rubber aggregates, copolymer coating still made the composite durable in frost conditions owing to its improved strain capacity and higher residual post-peak tensile strength.
