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Towards the carbon fibers in the building industry
There are two mainstreams in the building industry in the area of carbon fibers: rehabilitation and use as building material. The using of carbon fiber as a building material is taking place slower than as rehab system due to the very low cost of traditional building materials, the limitations of composite structure m…
Designing concrete for durability
Some of the factors affecting the durability of modern concrete structures are discussed, with an emphasis on the problems caused by modern portland cements. This is followed by a description of some concrete durability issues of current interest, such as plastic shrinkage, seawater attack, and sulfate attack. The str…
Role of clay constituents in stone decay processes
Stone alterability/durability is depending upon a number of intrinsic and extrinsic factors among which "clay minerals" constituents, either diffused throughout the stone framework or as coating-filling of void spaces, can play an important role. Swelling-shrinking and aggregation-disaggregation phenomena occurring by…
Physico-mechanical properties of fabrics prepared from blends of sulphonated jute fibre with natural and synthetic fibres
The plain woven fabrics have been prepared from the blends of sulphonated jute fibre with natural and synthetic fibres, and their geometrical, physico-mechanical and drapping properties studied. It is observed that the blended fibre fabrics show improved textile properties, almost similar to those of the cotton fabric…
Viability of utilization of waste materials from ceramic products in precast concretes
The recycled and re-valuation process of waste materials involves studies lead to a deep acknowledges of them, finding applications for their intended use. The waste materials from ceramic products can be recycled into the construction sector, as arid or pozzolanic materials. The current work deals with the incorporat…
Phase separation frustrated by the long-range Coulomb interaction. II. Applications
The theory of first-order density-driven phase transitions with frustration due to the long-range Coulomb (LRC) interaction developed in paper I of this series is applied to the following physical systems: (i) the low-density electron gas, (ii) electronic phase separation in the low-density three-dimensional $t\ensure…
Renormalization of the Optical Response of Semiconductors by Electron-Phonon Interaction
In the past five years enormous progress has been made in the ab initio calculations of the optical response of electrons in semiconductors. The calculations include the Coulomb interaction between the excited electron and the hole left behind, as well as local field effects. However, they are performed under the assu…
INDUSTRIAL CRYSTALLIZATION AND PRECIPITATION FROM SOLUTIONS: STATE OF THE TECHNIQUE
Crystallization and precipitation from solutions are responsible for 70% of all solid materials produced by the chemical industry. Competing with distillation as a separation and purification technique, their use is widespread. They operate at low temperatures with low energy consumption and yield with high purificati…
Production of stabilized Criegee intermediates and peroxides in the gas phase ozonolysis of alkenes: 1. Ethene, trans‐2‐butene, and 2,3‐dimethyl‐2‐butene
Ozone‐alkene reactions generate stabilized Criegee intermediates (of the form R 1 R 2 COO), which are believed to react with water molecules to form organic hydroperoxides, hydrogen peroxide and carboxylic acids. These reactions are thought to be significant sources of these environmentally important compounds, yet bo…
Syntheses of Silica/Polystyrene-block-Poly(ethylene oxide) Films with Regular and Reverse Mesostructures of Large Characteristic Length Scales by Solvent Evaporation-Induced Self-Assembly
Silica/diblock films with various mesostructures of large characteristic length scales were synthesized through evaporation-induced self-assembly (EISA). The structure-directing agents used were amphiphilic polystyrene- block -poly(ethylene oxide) (PS- b -PEO) diblock copolymers of high molecular weights. The synthesi…
Magnetocaloric effect in perovskite manganites La0.7−xNdxCa0.3MnO3 and La0.7Ca0.3MnO3
In perovskite manganites La0.7−xNdxCa0.3MnO3 (x=0, 0.05, 0.1, 0.15, and 0.20) prepared by the sol–gel technique, large magnetocaloric effects have been observed. The maximum of the magnetic entropy change peaks at the magnetic ordering temperature. Compared to La0.7Ca0.3MnO3, an enhancement of the magnetocaloric effec…
Product‐oriented process synthesis and development: Creams and pastes
Abstract A systematic procedure is presented for the synthesis and development of manufacturing processes for creams and pastes. The procedure integrates the skills of a chemist and a chemical engineer to produce a product with specified properties. The desired functional and sensorial performance of the product is fi…
Melt rheology of poly(lactic acid): Consequences of blending chain architectures
Abstract The rheology of blends of linear and branched poly(lactic acid) (PLA) architectures is comprehensively investigated. Measurement of the melt rheological properties of PLA is complicated by degradation effects but the addition of 0.35 wt% tris(nonylphenyl) phosphite (TNPP) provides excellent stabilization over…
Theoretical Prediction of Magnetic Properties of Ba(Ti1-xMx)O3 (M=Sc,V,Cr,Mn,Fe,Co,Ni,Cu)
We have performed ab-initio total energy calculations for the system of BaTiO 3 doped with 3 d transition metal (from Sc to Cu), within the framework of the local spin-density approximation (LSDA). Total energies corresponding to the nonmagnetic, ferromagnetic, and anti-ferromagnetic configurations of the magnetic ord…
Mechanism of Thermal Transport in Zirconia and Yttria‐Stabilized Zirconia by Molecular‐Dynamics Simulation
We present results of molecular‐dynamics simulations of the thermal conductivity, κ, of ZrO 2 and Y 2 O 3 ‐stabilized ZrO 2 (YSZ). For both pure ZrO 2 and YSZ with low concentrations of Y 2 O 3 , we find that the high‐temperature κ is typical of a crystalline solid, with the dominant mechanism being phonon‐phonon scat…
Scanning tunneling microscope study of boron-doped highly oriented pyrolytic graphite
Atomically resolved scanning tunneling microscopy (STM) results are shown for substitutionally doped boron atoms in the hexagonal carbon network of highly oriented pyrolytic graphite (HOPG). STM images of boron-doped HOPG reveal not only a clear change in the electronic structure of the surface graphene network, but a…
Polytetrafluoroethylene decomposition in air and nitrogen
Abstract The kinetics of the thermal decomposition of polytetrafluoroethylene (PTFE) have been studied using dynamic TG‐DTG at heating rates between 1 and 25°C/min at atmospheric pressure. Two different atmospheres were used: on the one hand, an inert atmosphere (N 2 )in order to study the pyrolysis of the material, a…
Charge-density waves and superlattices in the metallic layered transition metal dichalcogenides
The d1 layer metals TaS 2 , TaSe 2 , NbSe 2 , in all their various polytypic modifications, acquire, below some appropriate temperature, phase conditions that their electromagnetic properties have previously revealed as 'anomalous'. Our present electron-microscopic studies indicate that this anomalous behaviour usuall…
Critical Dynamics of Burst Instabilities in the Portevin-Le Chatelier Effect
We investigate the Portevin-Le Chatelier effect (PLC), by compressing Al-Mg alloys in a very large deformation range, and interpret the results from the viewpoint of phase transitions and critical phenomena. The system undergoes two dynamical phase transitions between intermittent (or "jerky") and "laminar" plastic dy…