Tribological behaviour of stellite matrix composites for high temperatures applications

Extreme working conditions affect material used as friction components in transportation field: they rapidly reach their limits and critical parts require to be regularly replaced. Alternative solutions withstanding higher operating conditions imply to find innovative materials. Stellite matrix composites including various solid lubricants, WS2 and h-BN, able to admitextreme conditions were developed using a Spark Plasma Sintering technique, which makes possible the formation of new microstructures out of reach by conventional means. Sliding tests were conducted using a pin-on-disc tribometer in air at 450°C, with a velocity of 0,25 m/s and various normal load ranged from 2.5 to 40 N. Influence of solid lubricant content and sensitivity to test parameters were studied in terms of friction and wear responses of the contacting materials. Friction properties are equivalent to Stellite ones and sometimes lesseffective. A reduction of wear is quantified for many composites, and the best behavior is observed for those that contain WS2. In agreement with the third body approach, interpretations are proposed to describe the interphase dynamics within the contact

Althusser : une nouvelle pratique de la philosophie entre politique et idéologie. Conversation avec Étienne Balibar et Yves Duroux (Partie I)

Dans cette conversation Étienne Balibar et Yves Duroux interrogent certaines des dimensions les plus actuelles et problématiques de l’œuvre de Louis Althusser. Dans un premier temps, ils reviennent sur la composition de Lire « Le Capital » en abordant la question du rapport entre structure et conjoncture. A partir de là, ils explorent les aspects de la relation d’Althusser avec le communisme, à la fois du point de vue « subjectif » et de celui du rapport avec le PCF. Dans un second moment, ils questionnent le rapport entre science et idéologie ainsi que l’intervention intellectuelle d’Althusser en se penchant tout particulièrement sur son spinozisme et sur son rapport à la psychanalyse

Trans-ancestry genome-wide association meta-analysis of prostate cancer identifies new susceptibility loci and informs genetic risk prediction.

Prostate cancer is a highly heritable disease with large disparities in incidence rates across ancestry populations. We conducted a multiancestry meta-analysis of prostate cancer genome-wide association studies (107,247 cases and 127,006 controls) and identified 86 new genetic risk variants independently associated with prostate cancer risk, bringing the total to 269 known risk variants. The top genetic risk score (GRS) decile was associated with odds ratios that ranged from 5.06 (95% confidence interval (CI), 4.84-5.29) for men of European ancestry to 3.74 (95% CI, 3.36-4.17) for men of African ancestry. Men of African ancestry were estimated to have a mean GRS that was 2.18-times higher (95% CI, 2.14-2.22), and men of East Asian ancestry 0.73-times lower (95% CI, 0.71-0.76), than men of European ancestry. These findings support the role of germline variation contributing to population differences in prostate cancer risk, with the GRS offering an approach for personalized risk prediction

Three-dimensional packaging technologies for highly integrated T/R modules

Future generations of avionic systems will be based on conformal antennas spread over the body of the aircraft. Smart skin systems will need highly integrated T/R modules (size below 2 cm2 at 10 GHz). To realise these modules, 3D integration of MMICs and control circuits is proposed

Silicon Packaging and RF Solder-free Interconnect for X-band SAR T/R Module

This paper presents recent development conducted in the area of RF packaging and interconnect technologies. An original concept of 3D silicon packaging including collective wiring process is proposed and applied to the design of an X-band T/R module demonstrator. An RF solder-less interconnect based on the CIN::APSE connecting system (CINCH TM) has been developed to address the need of vertical transition in new generation of SAR active antenna

Althusser : une nouvelle pratique de la philosophie entre politique et idéologie. Conversation avec Étienne Balibar et Yves Duroux (Partie II)

peer reviewe

Althusser : une nouvelle pratique de la philosophie entre politique et idéologie. Conversation avec Étienne Balibar et Yves Duroux (Partie I)

peer reviewe

Lifetime characterization of capacitive power RF MEMS switches

RF MEMS switches provide a low-cost,high performance solution to many RF/microwaveapplications and these switches will be importantbuilding blocks for designing phase shifters, switchedfilters and reflector array antennas for military andcommercial markets.In this paper, progress in characterizing of THALEScapacitive MEMS devices under high RF power ispresented. The design, fabrication and testing ofcapacitive RF MEMS switches for microwave/mm- waveapplications on high-resistivity silicon substrate ispresented .The switches tested demonstrated powerhandling capabilities of 1W (30 dbm) for continuous RFpower. The reliability of these switches was tested atvarious power levels indicating that under continuousRF power. In addition a description of the powerfailures and their associated operating conditions ispresentedThe PC-based test stations to cycle switches and measurelifetime under DC and RF loads have been developed.Best-case lifetimes of 1010 cycles have been achieved inseveral switches from different lots under 30 dbm RFpower

Compact reconfigurable ceramic filter based on combline type 3-D resonators

International audienc