Superconducting phase diagrams of LuB12_{12} and Lu1−x_{1-x}Zrx_xB12_{12} (x≤0.45x \le 0.45) down to 50 mK

Lutetium dodecaboride LuB12 is a simple weak-coupling BCS superconductor with critical temperature Tc = 0.42 K, whilst ZrB12 is a strong-coupling BCS superconductor with the highest critical temperature Tc = 6.0 K among this group of materials. In case of lutetium substitution by zirconium ions in LuB12 the crossover from weak- to strong-coupling superconductor can be studied. We have investigated the evolution of critical temperature Tc and critical field Hc in high-quality single crystalline superconducting samples of Lu(1-x)Zr(x)B12 (0 =< x =< 0.45) by measuring magnetic ac susceptibility between 1 K and 50 mK. To obtain this kind of experimental data, a new susceptometer was designed, constructed and tested, which can work in a wide temperature range of 0.05 K - 3 K in 3He-4He dilution refrigerator. The measurements with this new susceptometer revealed how Tc(x) and Hc(x) increases with increasing concentration of zirconium in Lu(1-x)Zr(x)B12 solid solutions as well as how their superconducting phase diagram develops.Comment: 6 pages, 4 figures, CSMAG conference contributio

Catalytic Hydrogenation of Nitrocyclohexane with CuCo/SiO₂ Catalysts in Gas and Liquid Flow Reactors

Catalytic hydrogenation of nitrocyclohexane proved to be an attractive alternative source of various chemical compounds: cyclohexanone oxime, cyclohexanone, cyclohexanol, cyclohexylamine and dicyclohexylamine. A growing interest in this reaction has been observed in the last few years. Herein, we present the catalytic performance of Cu/SiO2, Co/SiO2 and CuCo/SiO2 in gas and liquid flow nitrocyclohexane hydrogenation. The analysis of synthesized catalysts morphology (BET, TPR, XRD, TEM) in terms of their catalytic behavior allows us to draw general conclusions and determine the optimal conditions for the production of desired products. Application of the monometallic copper leads to the formation of cyclohexanone as the main product, but with low activity. On the other hand, Co/SiO2 shows high activity but gives cyclohexylamine. Bimetallic system CuCo(3:1)/SiO2 allows for the efficient production of 100% cyclohexanone at 5 bar and 75 °C

Catalytic Hydrogenation of Nitrocyclohexane with CuCo/SiO2 Catalysts in Gas and Liquid Flow Reactors

Catalytic hydrogenation of nitrocyclohexane proved to be an attractive alternative source of various chemical compounds: cyclohexanone oxime, cyclohexanone, cyclohexanol, cyclohexylamine and dicyclohexylamine. A growing interest in this reaction has been observed in the last few years. Herein, we present the catalytic performance of Cu/SiO2, Co/SiO2 and CuCo/SiO2 in gas and liquid flow nitrocyclohexane hydrogenation. The analysis of synthesized catalysts morphology (BET, TPR, XRD, TEM) in terms of their catalytic behavior allows us to draw general conclusions and determine the optimal conditions for the production of desired products. Application of the monometallic copper leads to the formation of cyclohexanone as the main product, but with low activity. On the other hand, Co/SiO2 shows high activity but gives cyclohexylamine. Bimetallic system CuCo(3:1)/SiO2 allows for the efficient production of 100% cyclohexanone at 5 bar and 75 &deg;C

Digital Predistortion with Compressed Observations for Cloud-Based Learning

This paper presents a novel system architecture for digital predistortion (DPD) of power amplifiers (PA), where the training of the DPD model is done in a remote compute infrastructure i.e. cloud or a distributed unit (DU). In beyond-5G systems it is no longer feasible to perform computationally intensive tasks such as DPD training locally in the radio unit front-end which has stringent power consumption requirements. Thus, we propose to split the DPD system and perform the compute-intensive DPD training in the DU where more processing resources are available. To enable the distant training, the observed PA output, i.e. the observation signal, must be available, however, sending the data-intensive observation signal to the DU adds additional communication overhead to the system. In this paper, a low-complexity compression method is proposed to reduce the bit-resolution of the observation signal by removing the known linear part in the observation to use fewer bits to represent the remaining information. Our numerical simulations show a reduction of 50 % of bits/samples for the accurate training of the DPD model. The DPD performance was evaluated based on simulation for a strongly driven PA operated at 28 GHz with a 200 MHz wide OFDM signal.acceptedVersionPeer reviewe

Turbostratic carbon supported palladium as an efficient catalyst for reductive purification of water from trichloroethylene

This work investigates the catalytic properties of turbostratic carbon supported Pd catalyst in hydrodechlorination of trichloroethylene (TCE HDC) in aqueous phase. 1.57 wt% Pd/C was thoroughly characterized by BET, TPHD, CO chemisorption, PXRD, STEM, XPS and used as the catalyst in removal of trichloroethylene from drinking water in batch and continuous - flow reactors. The studies showed that catalytic performance of Pd/C depended on the hydrophobicity and textural properties of carbon support, which influenced noble metal dispersion and increased catalyst tolerance against deactivation by chlorination. Palladium in the form of uniformly dispersed small (~3.5 nm) nanoparticles was found to be very active and stable in purification of water from TCE both in batch and continuous - flow operation.  

EUROSERVER:Share-anything scale-out micro-server design

This paper provides a snapshot summary of the trends in the area of micro-server development and their application in the broader enterprise and cloud markets. Focusing on the technology aspects, we provide an understanding of these trends and specifically the differentiation and uniqueness of the approach being adopted by the EUROSERVER FP7 project. The unique technical contributions of EUROSERVER range from the fundamental system compute unit design architecture, through to the implementation approach both at the chiplet nanotechnological integration, and the everything-close physical form factor. Furthermore, we offer optimizations at the virtualisation layer to exploit the unique hardware features, and other framework optimizations, including exploiting the hardware capabilities at the run-time system and application layers

EUROSERVER: Share-anything scale-out micro-server design

This paper provides a snapshot summary of the trends in the area of micro-server development and their application in the broader enterprise and cloud markets. Focusing on the technology aspects, we provide an understanding of these trends and specifically the differentiation and uniqueness of the approach being adopted by the EUROSERVER FP7 project. The unique technical contributions of EUROSERVER range from the fundamental system compute unit design architecture, through to the implementation approach both at the chiplet nanotechnological integration, and the everything-close physical form factor. Furthermore, we offer optimizations at the virtualisation layer to exploit the unique hardware features, and other framework optimizations, including exploiting the hardware capabilities at the run-time system and application layers