Báo cáo vật lý: "Analysis of Trace Elements in Teeth by ICP-MS: Implications for Caries" pptx

... Trace Elements in Teeth: Implication for Caries 2 teeth has been suggested as being indicative of Pb toxicity.5,9 Here, we have investigated the importance of the location of trace elements ... carious teeth than in those with healthy teeth. Keywords: ICP-MS, teeth, trace elements, caries, teeth pulps 1. INTRODUCTION Biomonitoring of trace elements in human teeth has become ... elements in the teeth have been previously demonstrated.1 Trace elements can be ingested by humans via different routes, including ingestion in the food and water or by deliberate consumption of...

Báo cáo vật lý: "Influence of the Silica-to-Surfactant Ratio and the pH of Synthesis on the Characteristics of Mesoporous SBA-15" ppt

... available in the literature.10,11 It is reported that the ratio of the silica source to the surfactant ratio and the pH of the synthesis gel can greatly influence the characteristics of the resulting ... amounts of C1– ions. Therefore, for the partial dehydration of PEO units, the volume of the hydrophilic part of the micelle decreases. This leads to an increase in the hydrophobic region or ... materials as they generally control the formation of micelles during the synthesis. 8 Hence, many aspects of the synthesis processes are involved in developing these porous materials, and they still...

Báo cáo vật lý: "Decolourisation of Reactive Orange 16 by Activated Carbon and Copper Oxide Catalysts Supported by Activated Carbon" ppsx

... structure of RO16 dye. Journal of Physical Science, Vol. 21(2), 29–40, 2010 29 Decolourisation of Reactive Orange 16 by Activated Carbon and Copper Oxide Catalysts Supported by Activated ... Decolourisation of Reactive Orange 16 (RO16) dye by HNO3-modified activated carbons (ACs) and a copper oxide catalyst supported by modified AC (Cu-Ac) were investigated. The percentage of colour ... the effect of HNO3-modified AC and its corresponding Cu -supported catalyst on the decolourisation of Reactive Orange 16 (RO16) dye. The chemical structure of RO16 dye is shown in Figure 1. ...

Báo cáo vật lý: "Performance of Carbide Cutting Tool when Machining Cast Iron FC 250 in Dry Condition and Using Cutting Fluid" ppt

... Pemotong (Performance of Carbide Cutting Tool when Machining Cast Iron FC 250 in Dry Condition and Using Cutting Fluid) Jaharah A. Ghani*, Mohd Noor Azmi Mohd Rodzi, Noordin Ibrahim dan Che ... above. In dry machining, wear mechanisms were caused by adhesion and micro-attrition at low combination of machining parameters. While at high combination of machining parameters, the cutting ... cast iron FC 250 in dry conditions and when using the cutting fluid has been carried out with emphasis on mechanisms of wear experienced by the cutting edge. In addition, the effects of other...

Báo cáo vật lý: "Preparation of ZrO2/Al2O3-pillared Saponite and Its Spectroscopic Investigation on NOX Adsorption" pptx

... adsorption bands corresponding to the saponite structure are identified in the region of 1012.69 cm–1 and 661 cm–1 as the vibrations of the tetrahedral and octahedral sheet. The band at ... ZrO2/Al2O3-pillared Saponite and Its Spectroscopic Investigation on NOX Adsorption Is Fatimah1*, Karna Wijaya2 and Narsito2 1Chemistry Department, Islamic University of Indonesia, Kampus ... adsorption of NOx on all samples occurs through disproportionation, leading to the formation of nitrous acid, H2O molecules, nitro species and anionic nitrosyls, NO–. It corresponds to some of...

Báo cáo vật lý: "Evaluation of In Vitro Antioxidant Activity of 5H-dibenz[b,f]azepine and Its Analogues" ppt

... damage Evaluation of In Vitro Antioxidant Activity 90 antioxidant activity of 5H-dibenz[b,f]azepine and its derivatives on hoxidation and lipid peroxidation actiuman LDL vity in the liposome ... lipid p activity of the 5H-dibenz[b,f]azepine and its derivatives in the liposoinduced by FeCl3 plus AA, is represented in Figure 2. Compound showed promising ALP activity like AA and BHA in a ... cpresence of the C=O stretching band at 1600 cm–1, whereas in compo(d), the presence of N–H stretching anobserved. In t Evaluation of In Vitro Antioxidant Activity 92 (1996). Lipid . Deshpande,...

Báo cáo vật lý: "EFFECTS OF Si, Al2O3 AND SiC SUBSTRATES ON THE CHARACTERISTICS OF DBRS STRUCTURE FOR GaN BASED LASER" ppsx

... of Physical Science, Vol. 17(2), 151–159, 2006 151 EFFECTS OF Si, Al2O3 AND SiC SUBSTRATES ON THE CHARACTERISTICS OF DBRS STRUCTURE FOR GaN BASED LASER N.M. Ahmed*, M.R. Hashim and ... number of layers. However, MOVPE process parameters for the GaN on alternative substrates need further optimization to reach the quality of GaN layer grown on different substrates (Si, SiC and ... sapphire influencing the GaN device quality and therefore makes commercialization for the GaN devices difficult. The lattice mismatch between 6H SiC and GaN is only 3.3% but SiC substrate has...

Báo cáo vật lý: "PREPARATION OF SELENIUM-DOPED ACTIVATED CARBON AND ITS UTILIZATION FOR IMPROVING THE QUALITY OF USED COCONUT OIL" pps

... The MAC (2.5% (w/w) Se /activated carbon) was prepared and can be applied to improve the quality of used coconut oil. Treatment of used coconut oil with MAC was effective in regenerating the ... AC. The pore size determination showed a distribution of 63.88% mesopore and 36.12% micropore. Several key quality indicators of the oil were determined for the used coconut oil before and ... in the range of 0.0%–8.0% is also found.1 The small quantity of the UFA is responsible for the relatively high resistance of the oil to oxidation.2 The UFA easily form peroxides in the...

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: "EFFECT OF FIELD STRENGTH IN THE VELOCITY ANISOTROPY OF FERROFLUIDS" pptx

... All the observations are interpreted in terms of grain-grain interaction and grain -field interaction that exist in the system. The field strength is found to enhance the structural formation in ... depending on the evolution of the aggregates with increasing strength of the external magnetic field. 26, 27 Under the effect of an external magnetic field, the particles of the ferrofluid ... to the external field suggests that the grain -field interaction is strong.20 However, the grain-grain interaction is almost the same as the number of grain remains constant and also the...

Báo cáo vật lý: "LOSS OF STORAGE AREAS DUE TO FUTURE URBANIZATION AT UPPER RAMBAI RIVER AND ITS HYDROLOGICAL IMPACT ON RAMBAI VALLEY, PENANG, PENINSULAR MALAYSIA" pps

... Journal of Physical Science, Vol. 18(2), 59–79, 2007 59 LOSS OF STORAGE AREAS DUE TO FUTURE URBANIZATION AT UPPER RAMBAI RIVER AND ITS HYDROLOGICAL IMPACT ON RAMBAI VALLEY, PENANG, PENINSULAR ... implied that the increase and propagation of peak stages downstream is not proportional (rational) to the percentage of urbanization and loss of storage areas. The impact of urbanization on peak ... stages at each of the sampling points indicated that the increase of peak stages and flows from Permatang Rawa and Ara River sub-basins due to urbanization and storage loss has a greater impact on...

Báo cáo vật lý: "Immobilization of Dithizone onto Chitin Isolated from Prawn Seawater Shells (P. merguensis) and its Preliminary Study for the Adsorption of Cd(II) Ion" pdf

... onto the surface of chitin, the intensity of dithizone bands is considerably low as compared to those of chitin. The XRD also suggests that immobilization of dithizone onto the surface of chitin ... The Effect of adsorbent mass on the adsorption of Cd(II) ion byithizone-immobilized chitin. g 10 àg/ml of Cd(II) ion oaused, resulting in the adsorption of Cd(II) ions on chitin -dithizone ... to those of unmodified chitin. This may be due to the addition of the various types of active sites (N, –NH and –SH) obtained from the immobilization of dithizone onto the surface of chitin which...

Báo cáo vật lý: "Characterization of Fe-Cr-Al2O3 Composites Fabricated by Powder Metallurgy Method with Varying Weight " ppsx

... Fe-Cr-Al2O3 have been fabricated by powder metallurgy route. The varying weight percentage of alumina particles studied have an effect on the final physical properties of the composites namely ... and characterizing composites of iron-chromium alloy reinforced with 5–25 wt. % of alumina particles fabricated using powder metallurgy method. The diffraction patterns of X-Ray diffraction ... 2008 89 Characterization of Fe-Cr-Al2O3 Composites Fabricated by Powder Metallurgy Method with Varying Weight Percentage of Alumina Saidatulakmar Shamsuddin1*, Shamsul Baharin Jamaludin2,...

Báo cáo vật lý: "Entrapment of Avidin in Sol-Gel Derived Silica Glasses" pot

... Changes in relative fluorescence intensity for proteins as a function of temperature. (○) Avidin in solution; (●) avidin- biotin in solution; (□) avidin in monolith; (■) avidin- biotin in monolith. ... 1: Infrared spectra of a) avidin; b) TMOS monolith; c) avidin in TMOS monolith; and d) avidin- biotin in TMOS monolith (amide region expanded, shown on right). Entrapment of Avidin in Sol-Gel ... water from the avidin binding site with the ligand. This is in agreement with the report of Mei et al.8 that in the absence of biotin, water contained in the avidin binding site may interact with...

Báo cáo vật lý: "Using of HPLC Analysis for Evaluation of Residual Monomer Content in Denture Base Material and Their Effect on Mechanical Properties" pptx

... 1.28 Journal of Physical Science, Vol. 19(2), 127–135, 2008 127 Using of HPLC Analysis for Evaluation of Residual Monomer Content in Denture Base Material and Their Effect on Mechanical Properties ... properties of denture base material related to the effect of level of residual monomer, and concluded that the percentage of higher levels of residual monomer effected on the tensile properties of denture ... 2 min and 10–14 min, respectively. 2.2.3 Determination of residual monomer in the denture base materials using HPLC HPLC was used to quantity the residual methyl methacrylate (MMA) content...

Xem thêm