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Glycerol oligomerization in continuous flow reactor
Nicolas Galy,Rémi Nguyen,Philippe Blach,Sophie Sambou,Denis Luart,Christophe Len 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.51 No.-
Thefirst synthesis of polyglycerol in continuousflow reactor in presence of potassium carbonate ashomogeneous catalyst was reported varying different parameters: temperature,flow and residence time. The different regioisomers of glycerol dimers and glycerol trimmers have been characterized and thedistribution of the different oligomers has been quantified. Further investigations in a cyclic mode,combined with short path distillation, afforded a mixture of predefined glycerol oligomers with adistribution: glycerol dimer (20 wt%), glycerol trimer (21 wt%), glycerol tetramer (16 wt%) and glycerolpentamer (11 wt%).
Ultra-low power 1T-DRAM in FDSOI technology
El Dirani, H.,Lee, K.H.,Parihar, M.S.,Lacord, J.,Martinie, S.,Barbe, J-Ch.,Mescot, X.,Fonteneau, P.,Broquin, J.-E.,Ghibaudo, G.,Galy, Ph.,Gamiz, F.,Taur, Y.,Kim, Y.-T.,Cristoloveanu, S.,Bawedin, M. ELSEVIER 2017 MICROELECTRONIC ENGINEERING Vol.178 No.-
<P><B>Abstract</B></P> <P>A systematic study of a capacitorless 1T-DRAM fabricated in 28nm FDSOI technology is presented. The operation mechanism is based on band modulation. The Z<SUP>2</SUP>-FET memory cell features a large current sense margin and small OFF-state current at 25°C and 85°C. Moreover, low power consumption during state ‘1’ writing is achieved with ~0.5V programming voltage. These specifications make the Z<SUP>2</SUP>-FET an outstanding candidate for low-power eDRAM applications.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Vanja Kokol,Vera Vivod,Suzana Arnuš,Urh Černigoj,Betka Galičič,Kristina Obu Vazner,Branko Neral,Aleš Mihelič 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7
Water stable, flexible and ecological acceptance composite films were prepared by the solvent casting process using native, dealuminated (treated with HCl to affect the surface chemistry and pore structure) and/or surface modified (coated with a cationic surfactant PDADM of different molecular weights) H-ZSM-5 type zeolite of different shapes (spherical vs. rod) and Si/Al ratios (P26 vs. P371) as adsorbents and cellulose nanofibrils (CNFs) as a networking matrix (in a weight ratio of 4:1). The films were tested for removal of the black anionic reactive dye with the highest bleeding effect at the first rinsing cycle of textile laundering. The effects of zeolite structure and surface chemistry on films dye’ removal kinetics from a standardised rinsing bath were investigated for up to 140 min at room temperature and using 0.1 g/l of dye concentration, depending on the film-to-bath weight-to-volume ratios (from 1:10 to 1:1000), thus simulating different rinsing conditions. The results show that up to 80 % of the dye was removed in the first 20 min in the lowest weight-to-volume ratio (1:10), fitting the Langmuir isotherm, and the process followed the pseudo-second order kinetic, yielding a multi-layer adsorption mechanism with a monolayer capacity of ~11 mg/g and ~21 vs. ~30 mg/g by films prepared from native or HCltreated and PDADMA100 vs. PDADMA400 coated P371 zeolites, respectively. Such efficacy was due to the more densely and fully surface-covered longitudinal P371 with PDADM400, given the huge electrostatic attraction sites for dye molecules, compared to the partly interpenetrated PDADM into relatively larger pore-sized (~450 nm vs. 220 nm) of P26. The filtration performance of the films was also examined, be used for the removal of the dye from the rinsing bath, released from the washing drum. An ultra-high flux rate (11.000 kL/m2 h MPa) with 45 % of dye removal efficacy and capacity of ~24 mg/g was provided by films prepared from spherical and aggregated P26PDADMA-400, showing its high potential also as a filter membrane.
Gali, Sahith,Subramaniam, Kolluru V.L. Korea Concrete Institute 2017 International Journal of Concrete Structures and M Vol.11 No.2
An experimental evaluation of crack propagation and post-cracking behavior in steel fiber reinforced concrete (SFRC) beams, using full-field displacements obtained from the digital image correlation technique is presented. Surface displacements and strains during the fracture test of notched SFRC beams with volume fractions ($V_f$) of steel fibers equal to 0.5 and 0.75% are analyzed. An analysis procedure for determining the crack opening width over the depth of the beam during crack propagation in the flexure test is presented. The crack opening width is established as a function of the crack tip opening displacement and the residual flexural strength of SFRC beams. The softening in the post-peak load response is associated with the rapid surface crack propagation for small increases in crack tip opening displacement. The load recovery in the flexural response of SFRC is associated with a hinge-type behavior in the beam. For the stress gradient produced by flexure, the hinge is established before load recovery is initiated. The resistance provided by the fibers to the opening of the hinge produces the load recovery in the flexural response.
Stability analysis of a rock slope in Himalayas
Latha, Gali Madhavi,Garaga, Arunakumari Techno-Press 2010 Geomechanics & engineering Vol.2 No.2
Slope stability analysis of the right abutment of a railway bridge proposed at about 350 m above the ground level, crossing a river and connecting two huge hillocks in the Himalayas, India is presented in this paper. The site is located in a highly active seismic zone. The rock slopes are intensely jointed and the joint spacing and orientation are varying at different locations. Static slope stability of the rock slope is studied using equivalent continuum approach through the most commonly used commercial numerical tools like FLAC and SLOPE/W of GEOSTUDIO. The factor of safety for the slope under static conditions was 1.88 and it was reduced by 46% with the application of earthquake loads in pseudo-static analysis. The results obtained from the slope stability analyses confirmed the global stability of the slope. However, it is very likely that there could be possibility of wedge failures at some of the pier locations. This paper also presents the results from kinematics of right abutment slope for the wedge failure analysis based on stereographic projections. Based on the kinematics, it is recommended to flatten the slope from 50o to 43o to avoid wedge failures at all pier locations.
Sahith Gali,Kolluru V. L. Subramaniam 한국콘크리트학회 2017 International Journal of Concrete Structures and M Vol.11 No.2
An experimental evaluation of crack propagation and post-cracking behavior in steel fiber reinforced concrete (SFRC) beams, using full-field displacements obtained from the digital image correlation technique is presented. Surface displacements and strains during the fracture test of notched SFRC beams with volume fractions (Vf) of steel fibers equal to 0.5 and 0.75% are analyzed. An analysis procedure for determining the crack opening width over the depth of the beam during crack propagation in the flexure test is presented. The crack opening width is established as a function of the crack tip opening displacement and the residual flexural strength of SFRC beams. The softening in the post-peak load response is associated with the rapid surface crack propagation for small increases in crack tip opening displacement. The load recovery in the flexural response of SFRC is associated with a hinge-type behavior in the beam. For the stress gradient produced by flexure, the hinge is established before load recovery is initiated. The resistance provided by the fibers to the opening of the hinge produces the load recovery in the flexural response.