Báo cáo vật lý: "Electrochemical Studies of Mild Steel Corrosion Inhibition in Aqueous Solution by Uncaria gambir Extract" doc

... EAElectrochemical Studies of Mild Steel Corrosion Inhibition 8 Table 4: Corrosion parameters for mild steel in aqueous solution with absence and presence of various pH of 150 ppm ethyl acetate extracts of ... Electrochemical Studies of Mild Steel Corrosion Inhibition 6  Figure 1: The relation between percentage of inhibition with concentration of ethyl acetate extract of U. gambir. Conc. (ppm) Inhibition ... inhibitive effect of ethyl acetate extract of U. gambir as a green corrosion inhibitor of mild steel in aqueous solution. The assessment of the corrosion behaviour was studied using weight loss...

Báo cáo vật lý: "MORPHOLOGY STUDIES OF POROUS GaP, SYNTHESIZED BY LASER-INDUCED ETCHING" pdf

... Further increase in the irradiation time to 15 min. led to the pore propagating deep into the substrate and the pore walls becoming extremely thin, in the range of 10 to 50 nm as can be seen in ... was increasing up to 6 W/cm2 at small etching time of 5 min, the etched surface onset of pore structure with small pits were irregular in shape and size, shown in Figure 4(a). For the etching ... (n-type) Etching solution: HF 40% Rinsing with ethanol Dry in air Figure 1: The laser-induced etching set-up 3. SURFACE MORPHOLOGY Surface morphology of porous semiconductors, in general,...

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

... of cooking palm oil. Increasing agitation speed will increase the specific interfacial area between the oil and the enzyme present in the aqueous phase, by reducing the droplet size. Since the ... hydrolysis reaction takes place at the interface, the increase in the interfacial area resulted in an increase in the initial rate of hydrolysis.3 The conversion increased when the agitation speed ... Preliminary Studies for Production of Fatty Acids from Hydrolysis of Cooking Palm Oil Using C. rugosa Lipase N.A. Serri, A.H. Kamarudin*, S.N. Abdul Rahaman School Of Chemical Engineering,...

Báo cáo vật lý: "A Perspective of Oil Palm and Its Wastes" doc

... only a few sources of energy and to include in its policy good energy management in relation to energy utilisation. Meeting the increasing demand for energy is indeed a continuing concern compounded ... with oil palm increased by 2.8% to 4.17 million hectares in 2006. The area expansion occurred mainly in Sabah and Sarawak, with a combined growth of 4.5% compared to 1.6% in Peninsular Malaysia.15 ... declining marginally by 0.5% to 20%, as shown in Figure 3. The decrease in OER in the years 1993 to 2001 is significant and due to the global recession, which accounts for the lower demand of...

Báo cáo vật lý: "ATTENUATION STUDIES ON DRY AND HYDRATED CROSS-LINKED HYDROPHILIC COPOLYMER MATERIALS AT 8.02 TO 28.43 keV USING X-RAY FLUORESCENT SOURCES" ppt

... were dried using blotting paper and wrapped in cling film before placing them in the XRF beam. Both the Kα and Kβ peaks of the XRF photons were utilized. The intensities of the incident and ... intensity of the incident beam. The density of the samples was determined by weighing and measuring the volume of the samples. Subsequently the mass attenuation coefficients (μ/ρ) of ... coefficient of a sample accurately was tested by measuring the mass attenuation coefficient of aluminium, since it is one of the most tested material in radiation physics. High purity aluminium...

Báo cáo vật lý: " WEAR MECHANISM OF TiN, TiAlN AND TiCN COATED DRILLS DURING DRILLING OF CARBON STEEL" pptx

... properties of engineering components. Previous study by earlier researchers showed that an increase in tool life may be due to the following phenomena: (i) increase in hardness,1 (ii) greater bonding ... has a higher melting point whereas other elements in the work piece such as Mn and P which have lower melting point have been disposed during drilling (Fig. 3). Melting point of iron is about ... study is to investigate the wear mechanism develops during drilling of High Speed Steel of molybdenum type drill 5 mm in diameter coated TiCN, TiN and TiAlN on the medium carbon alloy steel work...

Báo cáo vật lý: "TEMPERATURE DEPENDENCE OF RAMAN SPECTRA OF POROUS GAP" docx

... properties of semiconductors requires a detailed investigation of the structure of the frame which remains after etching, of the initial bulk material and the state of its surface. The properties of ... is promising for the fabrication of high-quality quantum wire structures. The softening and broadening of the optical phonon line in the Raman spectrum also explains the reduction of the coherence ... temperature dependence of the line-center and line-width of the first-order LO-phonon mode in GaP crystal. The variations in the line-center and line-width with temperature are shown in Figures 4 and...

Báo cáo vật lý: "ULTRASONIC STUDY OF THE SELF–ASSOCIATION OF ANILINE IN ETHANOL-CYCLOHEXANE MIXTURES" pptx

... with increasing mole fraction of aniline. The increasing trend of η revealed that the addition of aniline increases the effective molecular area.14 The increased in area due to the addition of ... reflected as the increased of πi. The perusal of Table 2 showed that πi is in increasing trend, thus revealing that the reduction of Vf is not due to splitting of components but is of enlargement. ... parameters of β, intermolecular Lf, Vf and πi. A rapid decreasing nature of β is observed with increased in the mole fraction of aniline. As the system gets more and more replaced by polar...

Báo cáo vật lý: "AN OVERVIEW OF BIASED ESTIMATOR" pptx

... Generalized Inverse Estimator.3–6 Principal component regression approaches the problem of multicollinearity by dropping the dimension defined by a linear combination of the independent variables ... Estimator of parameter , −rdγ1ˆ()−′′′=rrr rr′γT TZZT TZY is the PCRE of parameter , is the remaining eigenvectors of γrT′ZZ after having deleted of the columns of and satisfying ... Estimator of parameter , γ1ˆ()−′′′=rrr rr′γT TZZT TZY is the PCRE of parameter , is the remaining eigenvectors of γrT′ZZ after having deleted of the columns of and satisfying...

Báo cáo vật lý: "Mixing Behavior of Binary Polymer Particles in Bubbling Fluidized Bed" doc

... study of mixing process of free flowing polymers binary mixtures at different densities and colors in bubbling fluidized were investigated. The mixing properties were studied by analyzing the ... parameters influencing the solids mixing in the bubbling fluidized bed. From the results, complete mixing of binary polymer particles was attained at a bed depth of 17 cm and gas velocity of 1.38 ... describes the degree of mixing of the particle at particular time. This method enables the assessment of the overall mixing behavior in terms of the rate of mixing (through estimation of the time required...

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