Báo cáo vật lý: "Textural Characteristics of Activated Carbons Prepared from Oil Palm Shells Activated with ZnCl2 and Pyrolysis Under Nitrogen and Carbon Dioxide" doc

... Journal of Physical Science, Vol. 19(2), 93–104, 2008 93 Textural Characteristics of Activated Carbons Prepared from Oil Palm Shells Activated with ZnCl2 and Pyrolysis Under Nitrogen and Carbon ... textural characteristics of activated carbon prepared from oil palm shells activated with zinc chloride (ZnCl2) and pyrolysis under nitrogen and carbon dioxide were studied in this paper. The pyrolysis ... prepare and study the effect of different pyrolysis temperatures on the development of the porosity of activated carbon derived from oil palm shells activated with ZnCl2. The activated carbon...

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

... consist of the determination of Tafel curves. Tafel plots of mild steel in pH 5 aqueous solutions with and without inhibitors for various concentrations were summarised in Figure 3 and Table ... 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 U. gambir. ... parameters of the Nyquist plots of the ethyl acetate extract of gambir in different concentrations. From this experiment, the Nyquist plot shows that, at a concentration of 150 ppm, the percentages of...

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

... world crude oil demand. 3. UTILISATION OF OIL PALM WASTES The use of oil palm biomass other than the palm oil leads to increased efficiency as more energy is obtained from oil palm plantations. ... that of palm oil, the energy obtainable from the EFB product stream amounts to roughly 0.2 kg of oil equivalent per kg of palm oil. Based on Malaysia's projected 2005 palm oil production of ... crude palm oil and palm kernel from 1976 to 2006. The utilisation of oil palm waste is also discussed with its potential use as fertiliser, fuel and bio -oil. Keywords: empty fruit bunches, oil...

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

... composed of ferum Journal of Physical Science, Vol. 18(1), 75–85, 2007 75 WEAR MECHANISM OF TiN, TiAlN AND TiCN COATED DRILLS DURING DRILLING OF CARBON STEEL R.J. Talib*, M.R.M. Toff and ... milling machine at spindle rotation of 1,600 rpm and feed rate of 20 mm/min. A carbon steel plate with a thickness of 30 mm was used as a work piece and the depth of drill was set at 25 mm. After ... piece as a result of broken cutting lip and land, and blunting-off chisel wedge. 6. ACKNOWLEDGEMENTS The authors are grateful to the Government of Malaysia for the funding of this research....

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

... under different irradiation times 5, 10 and 15 min and with a fixed power density of 12 W/cm2. It can be seen from the SEM micrographs that the surface morphology and pore structure of ... 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 time of 10 min, the structure of porous ... coated highly reflecting mirror (99.5%) and focused on to the sample of 1.5 mm diameter by using a suitable quartz lens with focal length of 10 and 5 cm of diameter. This lens was mounted on...

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 ... Dependence of Raman Spectra 52 Figure 2: Schematic diagram of LIE process. 3. RESULTS AND DISCUSSION 3.1. Raman Spectrum of Porous GaP The Raman spectrum of porous GaP sample prepared ... 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 length of phonons....

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

... cyclohexane and with aniline, using the sound velocity data. The present work deals with the measurement of U, ρ and η, and computation of related parameters at 303 K in the ternary mixture of aniline+ethanol+cyclohexane ... MHz frequency with an accuracy of ± 0.1 ms–1. The ρ and η are measured using a pycknometer and an Ostwald’s viscometer, respectively with an accuracy of 3 parts in 105 for ρ and 0.001 Nsm–2 ... calculated 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...

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

... 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 ... advantages of the ORRE and the Shrunken Estimator. The Class Estimator combined the techniques of the ORRE and the PCRE while the Class Estimator combined the techniques of the Liu Estimator and ... 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

... in a given mass of sample depends on the size distribution of the components. Thus, for a binary mixture of spherical particles of components A and B with proportions of PA and PB, respectively, ... mixing behavior in terms of the rate of mixing (through estimation of the time required for the mixing index to increase from zero to a certain value) and with the degree of mixing at the mixing ... Influence of bed depth on the degree of homogeneity of mixtures with time. Spout t = 12 s Figure 9: Photograph showing the spout of homogeneous mixture at bed depth of 17 cm and gas...

Báo cáo vật lý: "Phase Transformation of Rust in the Presence of Various Tannins" pot

... the presence of magnetite (Fig. 1). Among these bands, 1021 cm–1 was the strongest and could be considered as lepidocrocite’s major band6 and will be used as the reference band. The mangrove ... the lepidocrocite, followed by the formation of a new phase. The formation of ferric-tannates were evident with the presence of peaks at around 1443, 1354 and 1250 cm–1. The lepidocrocite ... spectra of chestnut tannins with respect to time of immersion. initially began to reduce after two weeks of immersion and almost disappeared after three and four weeks. The degree of transformation...

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