RESEARCH ON MECHANICAL PROPERTIES OF QUATERNARY SEDIMENTS DISTRIBUTED IN HANOI AREA UNDER DYNAMIC LOADS

... the dynamical properties of these soils are not sufficient for the research, planning, designing and constructing of building foundation Therefore, research on mechanical properties of quaternary ... sediments distributing in the Hanoi area under dynamic loads is urgent and topical Objectives Determining the soil dynamical properties, including strength and deformation of typical soils in ... district of Hanoi City Contents - An overview of soil dynamics; - Research on the theoretical basis of soil dynamical properties; - Engineering geological characteristics of Quaternary sediments in Hanoi...

Processing and mechanical properties of pure mg and in situ aln reinforced mg 5al composite 1

... mechanochemical milling Synthesis of Mg- 5wt%Al reinforced with 1wt% of in- situ formed AlN via mechanical milling and power metallurgy techniques Study of microstructures and mechanical properties of Mg MMCs ... combination of strength and ductility of the nc Mg composite Introduction Grain refinement, reinforcement particles, dislocation and solid solution contribute to the strengthening of Mg composite ... milling durations Investigation of the deformation behavior of Mg- 5wt%Al-1wt %AlN systems Introduction 1. 3 Scope of the thesis This thesis is composed of seven chapters including this chapter of introduction...

Processing and mechanical properties of pure mg and in situ aln reinforced mg 5al composite 2

... recovery during milling was confirmed by the corresponding low internal strain The internal strain during milling showed inverse grain size dependence Absence of dislocations within the grains of as ... Crystalline Grain boundary Triple line Quadruple node Intercrystalline 0.6 0.4 0 .2 0.0 10 100 1000 G rain S ize (nm ) Figure 2. 6 Plot of volume fractions of crystalline and intercrystalline components ... substantial influence of texture on mechanical properties is observed in extruded Mg [104, 105] exhibiting higher yield stress of unreinforced extruded Mg with respect to Mg- Y2O3 [106] As the testing...

Processing and mechanical properties of pure mg and in situ aln reinforced mg 5al composite 3

... JIM 34 (19 93) 952-959 Y Ogino, S Murayama, T Yamasaki, J Less-Common Met 168 (1991) 221- 235 67 In- situ formation of Aluminium Nitride composite powder 27 28 29 30 31 32 33 34 35 36 37 38 39 40 ... evidence of weak and broad AlN peaks The proportion of AlN in the powder increased with further milling Higher and distinct AlN peaks indicating higher 51 In- situ formation of Aluminium Nitride composite ... (b) Figure 3. 1 (a) Morphology of Al powder and (b) structure of pyrazine In this study, in- situ formed AlN composite powder is obtained by milling the mixture of elemental Al with pyrazine (C4H4N2)...

Processing and mechanical properties of pure mg and in situ aln reinforced mg 5al composite 4

... resistivity of Mg- 5Al- 1AlN composite sample and pure Mg samples 4. 3.3 Thermal properties From Table 4. 3 and Fig 4. 8, the same trend of αc and Mg is observed for both composite and pure Mg samples Milling ... as AlN and in- situ formed Al1 2Mg1 7, MgH2, MgAl2O4, and MgO during sintering and extrusion Such stable grain structure with no grain growth up to 550°C has been reported in commercially pure Mg ... increasing milling duration, broadening of XRD peaks and declining in peak intensity are observed due to the reduction in grain size and introduction of microstrain during milling In Fig 4. 1(b), intensities...

Processing and mechanical properties of pure mg and in situ aln reinforced mg 5al composite 5

... [ 15] and Wang et al [ 35] A ctivation v o lum e (b ) 300 Mg- 5Al- 1AlN Mg 30 40 250 200 150 100 50 0 10 20 M illing du ratio n (h) Figure 5. 8 Apparent activation volume of composite and pure Mg ... Fig 5. 5 and Table 5. 2, as in the composite samples, 0h-MMed samples show similar ductility of 8-10% and yield stress ranging from 122 to 138 MPa indicating insignificant dependence of strain rate ... decreasing strain rate and increasing milling duration However, no significant increase in ductility with milling duration at the highest strain Elongation (%) rate is detected 45 40 35 30 25 20 15...

Processing and mechanical properties of pure mg and in situ aln reinforced mg 5al composite 6

... fraction of second phase constituents, since the Mg grain size is in nanoscale and thus less likely for the reinforcement and in- situ formed particles to exist in the interior of the Mg grain, this ... meaning defined previously Using the parameters for Mg in Table 6. 2, a theoretical value of Dgb is predicted to be 3.7410-28 m2 s-1 However, Qgb value in Table 6. 2 is for coarse grain Mg and ... [6, 10,12,19]), eutectic alloys [20] and discontinuously reinforced metal-matrix composites [21-25] display an indirect evidence of diffusionally accommodated sliding at phase boundaries and interfaces...

Processing and mechanical properties of pure mg and in situ aln reinforced mg 5al composite 7

... 40h-MMed pure Mg samples This finding implies that the grain refinement to a certain length scale diminishes the significance of solid solution strengthening and dispersion hardening 30hMMed composite ... examination can be performed on the pure Mg samples to confirm the diminishing effect of reinforcements (insitu formed second phase particles and/ or ex -situ reinforcement particles) when the grain ... grain sizes and then performing systematic tests under identical conditions of temperature and stress for the purpose of determining the values of the grain size sensitivity, and (c) performing...

Báo cáo sinh học: "Research Article A Note on Symmetric Properties of the Twisted q-Bernoulli Polynomials and the Twisted Generalized q-Bernoulli Polynomials" docx

... numbers and its derivatives,” Journal of Mathematical Analysis and Applications, vol 339, no 1, pp 598–608, 2008 13 T Kim, On the analogs of Euler numbers and polynomials associated with p-adic ... generalized twisted Bernoulli numbers and polynomials of higher order,” Journal of Computational Analysis and Applications, vol 12, pp 695–702, 2010 27 T Kim, On a q-analogue of the p-adic log gamma ... Journal of Inequalities and Applications, vol 2006, Article ID 34602, pages, 2006 L.-C Jang and T Kim, On the distribution of the q-Euler polynomials and the q-Genocchi polynomials of higher...

Research report: "To study the effect of substituents on the properties of aniline by the method of approximate quantum AM1" pps

... Correlation of the dipole moment with the Hammett constants of the substituents It is evident from the table II that electron-donating substituents on the phenyl ring increase the pKa of anilines ... Correlation of QN with the Hammett constants of the substituents According to the table 2, electron-donating substituents decrease the dipole moment of compounds and electron-withdrawing substituents ... representative properties: the C-N bond length (d(C-N)), charge on atom N (QN), dipole moment(à) and the acid dissociation constant (pKa) The results of geometry optimization of aniline by AM1 method...

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

... sample of PMMA for self-cure denture base material HPLC Analysis for Evaluation 132 Table 1: The results of MMA content of denture base materials compared with ISO standard Denture base material ... 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 ... approximately 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 in the...

Báo cáo vật lý: "Comparison of the Effects of Organoclay Loading on the Curing and Mechanical Properties of Organoclay-Filled Epoxidised Natural Rubber Nanocomposites and Organoclay-Filled Natural Rubber Nanocomposites" pot

... 2009 39 Therefore, the major aim of this work was to compare the curing characteristics and mechanical properties of organoclay- filled epoxidised natural rubber (ENR 50) nanocomposites and organoclay- filled ... agglomeration of organoclays All these observations are in concordance with the XRD patterns and confirmed a better dispersion of the organoclay in the case of ENR 50 Figure 15: TEM micrograph for phr organoclay- filled ... 5°C The various rubber additives were added to the masticated natural rubber prior to the addition of organoclay, and sulphur was added last The organoclay rubber nanocomposites were conditioned...

Báo cáo lâm nghiệp:"Influence of basic density and temperature on mechanical properties perpendicular to grain of ten wood tropical species" pot

... and amplitude of the softening behaviour are affected by them These observations lead to the focus on one mechanical test to study the softening behaviour and one criterion Compression test and ... suggested to measure softening temperature on graphs The curves of criterion in function of temperature were 56 S Bardet et al Figure Evolution of ey, gR (°) and df (mm) in function of temperature ... we observed a strong correlation between mechanical criteria and basic density An illustration of the evolution of every mechanical criteria respect to basic density at one temperature is given...

Experimental investigation for powder reinforcement effect on mechanical properties and natural frequency of isotropic hyper composite plate with various boundary conditions

... 70 Table Experimental natural frequency results for isotropic hyper composite plate with different reinforcements short fiber and powder effect for various boundary conditions plate, with AR=1 ... 1316.2 Table Experimental natural frequency results for isotropic hyper composite plate with different reinforcements short fiber and powder effect for various boundary conditions plate, with AR=1.5 ... And, Tables and shows the natural frequency of plate samples studied with experimental investigation with various volume fraction of resin and reinforcement and different boundary conditions (SSSS,...

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