Báo cáo vật lý: "FABRICATION OF LOW COST OF ALUMINIUM MATRIX COMPOSITE REINFORCED WITH SILICA SAND" potx

... hardness of aluminium composites decreases. Also, it is noted that the hardness of aluminium matrix composites reinforced with silica sand is higher than those reinforced with commercial silica. ... the higher sintered density accomplished in aluminium matrix composite reinforced with silica sand. Fabrication of Low Cost of Aluminium Matrix Composite 48 reinforcing phases requires careful ... the silica content in aluminium composite. Aluminium matrix composite reinforced with silica sand showed a slightly higher hardness and modulus of fracture compared to the aluminium matrix composite...

Báo cáo vật lý: "Flexural and Morphological Properties of Epoxy/Glass Fibre/SilaneTreated Organo-montmorillonite Composites Nor Hamidah Mohd" potx

... strength of the E/GF composites with the addition of silane-treated OMMT. According to Lin et al.,5 the clays were dispersed between both the bundles of GF and within the interstices of the ... effects of silane-treated OMMT loading on the flexural modulus of E/GF composites are presented in Figure 2. The incorporation of silane-treated OMMT increases the stiffness of the E/GF composites ... effects of silane-treated OMMT on the flexural strength of E/GF composites. It is interesting to note that the flexural strength of E/GF/silane-treated OMMT composites is higher than that of E/GF...

Báo cáo vật lý: "The Kinetics and Mechanism of the Core-shell Styrene-butyl Acrylate Polymerisation" pdf

... measurements of the shell butyl acrylate shell, the range of concentrations of butyl acrylate was 9.9%–12.6%, that of SLS was 0.1–0.4 CMC, and that of APS was 0.01%–0.04%. 2.3 Determination of Solid ... polymerisation rate of the styrene core, and k is the rate reaction constant in the formation of the styrene core. 3.4 Mechanism of Reaction in the Formation of the Styrene Core The order of the styrene ... (b)Figure 2: Log of the initial rate to log of the initial SLS concentration. 3.3 The Reaction Order of APS The rate of initiator decomposition is equal to the rate of radical absorption...

Báo cáo vật lý: "EXOTHERMIC TRANSITIONS ON COOLING OF GELATINIZED NATIVE RICE STARCH STUDIED BY DIFFERENTIAL SCANNING CALORIMETRY" doc

... of more water promotes higher mobility of the whole system and made the recrystallization process appeared at lower temperature. The enthalpy of exotherm of 1:2 system was higher compared with ... and narrow exotherms at lower peak temperatures (85oC–100oC) which became smaller with lower cooling rate. These observations suggest the presence of two types of amylose-lipid complexes ... flow (W g–1) Figure 4: Manifestation of the exothermic event during cooling of 1:2 gelatinized native rice starch-water matrix from 140oC at 1, 5 and 10oC min–1. Journal of...

Báo cáo vật lý: "Protective Agent-Free Synthesis of Colloidal Cobalt Nanoparticles" potx

... case of increasing precursor concentration, it was found that the formation of Co nanoparticles was very slow at low concentrations of Co chloride (< 30 mM) even with a large amount of N2H4 ... formation of Ni-Ag core-shell nanoparticles by first generating Ni nanoparticles through the reduction of Ni2+ with N2H4 and followed by coating of the as-prepared Ni nanoparticles with Ag ... formation of colloidal Co nanoparticles with sizes in the range of 6–10 nm by high-temperature reduction of Co chloride with superhydride in the presence of oleic acid and triphenylphosphine....

Báo cáo vật lý: "Preliminary Studies for Production of Fatty Acids from Hydrolysis of Cooking Palm Oil Using C. rugosa Lipase" pot

... flask. 2.3 Determination of Degree of Hydrolysis (Conversion) and Rate of Hydrolysis The degree of hydrolysis was determined by titration of the oil phase samples with 0.1 M sodium hydroxide ... The degree of hydrolysis, X is calculated as below: (ml NaOH used) (molarity of NaOH) (average molecular weight of fatty acid),% =10 (weight of sample)X (1) The rate of hydrolysis, ... Hydrolysis Profile Figure 1 shows a typical hydrolysis profile of palm oil at temperature of 45ºC for an initial palm oil concentration of 0.1 g palm oil/ml iso-octane at agitation speed of 200...

Báo cáo vật lý: "Physical and Chemical Characteristics of Citrullus lanatus Var. Colocynthoide Seed Oil" pdf

... important factors that determine the importance of dehulling due to its low content of oil. So, the importance of dehulling should decrease with the decreases of the hull percentage. Oil content (35.5%) ... growth of the importance of oilseeds in the national economy of Sudan, the high demand to look for a new source of oil and the sufficient availability of this plant in Sudan, the scarcity of scientific ... several parts of the country as well as an important food item.4 To ensure the increase of oils and fats, it is necessary to continue not only with the development of new varieties with improved...

Báo cáo vật lý: "Structural and Dielectric Properties of the Mn-Doped BaO-Nd2O3-4TiO2 System" ppt

... pressed with a cylindrical mould with a diameter of 16 mm under a pressure of 150 MPa to yield samples in pellet form. The specimens were sintered at various temperatures in the range of 1200oC ... GHz as a function of sintering temperature with different compositions. The sample with composition MBNT4 showed the highest dielectric constant in the range of 75 to 85 with different sintering ... sintered at 1250oC. The diameter of the spherical grains and rod-like grains are similar in the range of 0.5 to 0.8 μm. The lengths of the rod-like grains were of 2.0 to 2.5 μm. As the temperature...

Báo cáo vật lý: "Volumetric and Thermodynamic Studies of Molecular Interactions in Ternary Liquid Mixtures at 303, 308 and 313K" pptx

... fractions of 1-alkanol, as well as with temperature. However, the value of viscosity increased with increasing concentrations of 1-alkanols and decreased with increasing temperature. As the number of ... subsequent formation of (new) H-bonds [C=O … H–O] between the proton acceptor oxygen atom (with lone pair of electrons) of the C=O group of DMF and the proton of the OH group of 1-alkanols. The ... the experimental temperature. The flow time of water()wt and the flow time of solution ()st were measured with a digital stop clock with an accuracy of 0.01 s (Model: RACER HS-10W) An...

Báo cáo vật lý: "Mechanochemical Synthesis and Characterisation of Bismuth-Niobium Oxide Ion Conductors" ppsx

... program with a lattice of Bi3NbO7 reported by Ling and Johnson as starting values.11 All of the peaks in the XRD patterns of these materials can be fully indexed in a tetragonal system with ... for all of the samples of BixNbOδ (2.5 ≤ x ≤ 6). The Arrhenius plot of YSZ is included for comparison purposes.15 In general, at 300oC, the conductivity decreased in order of: Bi6NbO11.5 ... mixtures of Bi2O3 (99.9% Aldrich) and Nb2O5 (99.9% Alfa Aesar) (total weight ~ 8 g) and 50 agate balls with diameters of 10 mm were placed in an agate bowl (99.9% SiO2) with a maximum...

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