properties of materials and section properties
Strength of materials and structures (malestrom)
Ngày tải lên :
08/04/2014, 11:25
... curve of Figure 1.2 is not typical of all materials; it is reasonably typical, however, of the behaviour of brittle materials, which are discussed more fully in Section 1.5 An important feature of ... Tension and compression: direct stresses Strength properties o some engineering materials f The mechanical properties of some engineering materials are given in Table 1.2 Most of the materials ... Strain energy of elastic torsion 16.8 Plastic torsion of a circular shaft 16.9 Torsion of thin tubes of non-circular cross -section 16.10 Torsion of a flat rectangular strip 16.11 Torsion of thin-walled...
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JOURNAL OF MECHANICS OF MATERIALS AND STRUCTURES
Ngày tải lên :
02/06/2015, 17:15
... nullspace of is the set of all self stresses This space is a subspace of Rk We call its dimension s the number of self stresses Likewise, we call the dimension m of the nullspace of T the number of ... mass matrix and f is the vector of known terms According to (57) and (58), here the rows of M are the edge vectors, the linear combinations of them and the normal vectors; the entries of f are the ... for the example of Figure The coordinates √ of constrained nodes are given as in Section 4.3; edges AC and B E have fixed length equal to and respectively 120 ANDREA MICHELETTI AND WILLIAM O WILLIAMS...
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Computational mechanics of materials and structures
Ngày tải lên :
02/06/2015, 17:15
... macroscopic properties of asphalt 2.4 Rubber Materials and Products The treatment of rubber materials and products is characterized by a synthesis of experimental and numerical investigations and the ... include the increase of the thickness of the structure and of the stiffness of a spring attached to the structure (see Fig 9), respectively, and the reduction of the rise of the undeformed structure ... a car tire and the road Thus, the frictional properties of these blocks are of crucial importance for the performance of tires in breaking events and in rolling turns Investigation of the frictional...
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Sourcing and outsourcing of materials and services in chemical supply chains
Ngày tải lên :
11/09/2015, 16:07
... (SC) is a network of facilities that perform functions of procurement of materials, transformation of these materials into intermediate and finished products, and distribution of these products ... they are running Zeus offers a library of software component s and tools that facilitate fast and friendly design, development, and deployment of multi-agents It consists of three main components: ... 5.8: Quantities (kton) of materials bought under different contracts in Example (case and case 9) and Example (case 10) 109 Table 5.9: Demands (Demands (Dmst kton) and inventory holding...
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Tiêu chuẩn Châu Âu EC6: Kết cấu gạch đá phần 2: Yếu tố ảnh hưởng đến thiết kế, lựa chọn vật liệu (Eurocode5 BS EN1996 2 e 2006 Design of masonry structures part 2: Desgin consideratins, selection of materials and execution of masonry)
Ngày tải lên :
11/12/2016, 12:22
... Code of practice for use of masonry Structural use of reinforced and prestressed masonry — BS 5628-3:2001, Code of practice for use of masonry Materials and components, design and workmanship and ... construction 3.2 Acceptance, handling and storage of materials 3.2.1 General (1)P The handling and storage of materials and masonry products for use in masonry shall be such that the materials are not damaged ... 18 3.2 Acceptance, handling and storage of materials 18 3.2.1 General 18 3.2.2 Reinforcement and prestressing materials 18 3.3 Preparation of materials ...
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Mechanics and Properties of Composed Materials and Structures doc
Ngày tải lên :
16/03/2014, 22:20
... Andreas Öchsner Lucas F M da Silva Holm Altenbach • Editors Mechanics and Properties of Composed Materials and Structures 123 Editors Andreas Öchsner Department of Applied Mechanics Faculty of ... The effect of geometrical parameters and material properties of face sheets and core are studied on the face wrinkling of sandwich plates Comparison of the present results with those of plate theories ... tension, mechanism of opening and closing of cracks in concrete under dynamic load, tensile and shear stiffness of cracked concrete, • Strain rate effect of the material properties of masonry, reinforced...
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hydrothermal properties of materials experimental data on aqueous phase equilibria and solution properties at elevated temperatures and pressures
Ngày tải lên :
01/04/2014, 11:22
... Pryor and Jentoft, 1961 Anderson and Prausnitz, 1986 Miller and Hawthorne, 2000 Mathis et al., 2004 Alwani and Schneider, 1969 Pryor and Jentoft, 1961 Pryor and Jentoft, 1961 Pryor and Jentoft, ... Barr-David and Dodge, 1959 Anderson and Prausnitz, 1986 Marshall and Jones, 1974b Marshall and Jones, 1974b Griswold and Wong, 1952 Marshall and Jones, 1974b Wormald and Yerlett, 2002 Griswold and Wong, ... crust, and of major importance in geology, geochemistry, mining, and in industrial practices such as metallurgy and the synthesis and growth of crystals The theoretical understanding of the phase...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 1 doc
Ngày tải lên :
11/08/2014, 14:20
... Conductivity of Metals? • Drude model: Sea of electrons – all electrons are bound to ion atom cores except valence electrons – ignore cores – electron gas Schematic model of a crystal of sodium ... R=V/I; σ=E/j=neµ) Ohms/square ⇒ Note, if L=W, then R= ρ /t independent of magnitude of L and W Useful for working with films of thickness, t R R R 3.225 © H.L Tuller-2001 17 How to Make Resistance ... from electric force on electron! 3.225 © E.A Fitzgerald-1999 Equation of Motion - Impact of Collisions Assume: • probability of collision in time dt = dt/τ • time varying field F(t) v(t+dt) = (1-...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 5 ppt
Ngày tải lên :
11/08/2014, 14:20
... Fermi level is approximately in the middle of the band gap • The law of mass action describes the electron and hole populations, since the total number of electron states is fixed in the system ... E F = m* * + kbT ln h me Eg Since me* and mh* are close and in the ln term, the Fermi level sits about in the center of the band gap ( ) − Eg k T 2 * * p or n = ni = 2 b me ... the barrier NCNV is the density of the reactants, and n and p are the products N C NV → e′ + h • Eg − Eg n np =ekT = i N C NV N C NV b • • • Thus, a method of changing the electron or hole...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 10 pps
Ngày tải lên :
11/08/2014, 14:20
... capable of sensing a change in environment and responding without need for a microprocessor A device has both gas sensing and actuating function by integration of semiconducting oxide and piezoelectric ... Electrode ∆f Resonator Electrode 3.225 © H.L Tuller-2001 23 Choice of Piezoelectric Materials • Temperature limitations of piezoelectric materials Material Max Operating Limitations o Temperature ( ... control down to 0.1 mm through the use of highly selective p-n junction etch-stops • fabrication of structures with negligible internal stresses • fabrication of structures not constrained by specific...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 9 pps
Ngày tải lên :
11/08/2014, 14:20
... (Najafi and Hetke, IEEE Trans Biomed Eng 37, 474 (1990).) 3.225 28 14 Measurement of Gas Sensor Performance • Gas sensing materials: Sputtered ZnO film (150 nm (Massachusetts Institute of Technology) ... stability … 3.225 23 Sensor Materials Chemical Environmental Stimulus Gas Sensor Electrical Signal compatible with Microprocessor System Requirements of Gas Sensor Materials • • • • • • • • 3.225 ... (Pb0.98La0.02(Zr0.7Hf0.3)1-xTixO3 AFE FE System (C Heremans and H.L Tuller, J Euro Ceram Soc., 19, 1139 (1999).) Atmosphere dependent conductivity (I Kosacki and H.L Tuller, Sensors & Actuators B 24-25, 370...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 3 pot
Ngày tải lên :
11/08/2014, 14:20
... , z )ψ = − i ∂t 2m ψ and ∆ ψ must be finite, continuous and single valued ψψ * real with ψψ *dV = probability of finding particle in volume dV Average or expectation value of variable α = ∫ ψ ... *α op ψ dV v 3.225 © H.L Tuller-2001 19 Time and Spatial Dependence of ψ Assume ψ (x,y,z,t) separable into ψ(x,y,z) and φ(t) Applying separation of variables: − h ∇ 2ψ h ∂φ +V = − =ε 2m ψ i φ ... determined by the crystal structure and valence n determines the energy and velocity of the highest occupied electron state at T=0 3.225 © E Fitzgerald-1999 Representation of E,k for 2-D Material E= h...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 6 pps
Ngày tải lên :
11/08/2014, 14:20
... achieved where diffusive flux of the carriers is balanced by the drift flux 3.225 © E Fitzgerald-1999 12 Joining p and n p n Ec EF Ev Carriers flow under driving force of diffusion until EF is flat ... Qualitative Effect of Bias • • • Applying a potential to the ends of a diode does NOT increase current through drift The applied voltage upsets the steady-state balance between drift and diffusion, ... Means to Create Internal Potentials: Heterojunctions • Different semiconductor materials have different band gaps and electron affinity/work functions Internal fields from doping p-n must be superimposed...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 8 pdf
Ngày tải lên :
11/08/2014, 14:20
... of a chromium atom (A) and a trivalent chromium ion (B) 3.225 © H.L Tuller, 2001 10 Octahedral Environment of Transition Metal Ion Interaction of the d orbitals of a central ion with six ligands ... Fitzgerald-1999 Characteristics of Optical Fiber 3.225 Colors Produced by Chromium Above: alexandrite, emerald, and ruby Center: carbonate, chloride, oxide Below: potassium chromate and ammonium dichromate ... of positive and negative ions 3.225 © E Fitzgerald-1999 © H.L Tuller, 2001 Ferroelectrics Applications • Capacitors • Non-volatile memories • Photorefractive materials 3.225 Characteristics of...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 4 pps
Ngày tải lên :
11/08/2014, 14:20
... the valence band to the conduction band E Ec near band gap E=hν k Creates a ‘hole’ in the valence band Ev near band gap 3.225 © E Fitzgerald-1999 Holes and Electrons • • Instead of tracking electrons ... 1,000,000 Remember that: 3.225 µ= eτ m* and 1 ∂2E = m * h ∂k 2 Metals and Insulators • EF in mid-band area: free e-, metallic • EF near band edge – EF in or near kT of band edge: semimetal – EF in gap: ... Real Band Structures • GaAs: Very close to what we have derived in the nearly free electron model • Conduction band minimum at k=0: Direct Band Gap 3.225 © E Fitzgerald-1999 15 Review of H atom...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 11 potx
Ngày tải lên :
11/08/2014, 14:20
... since energy ~ LI and for loop L = ΦB I Φ B = ∫ ∫ H ⋅ dS ~ HA ∴ µH = Φ B I = HAI and ∴ µ = IA e ω A = πr c 2π e µ = − ωr 2c I =− 3.225 © E Fitzgerald-1999 Microscopic Source of Magnetization • ... induction, “softer” Magentic anisotropy hardness of loop dependent on crystal direction comes from spin interacting with bonding 3.225 © E Fitzgerald-1999 Domains in Ferromagnetic Materials B ... Fe, Ni, Co -> J positive! Other elements J is negative Rule of Thumb: interatomic distance r ≡ > 2ra 2(atomic radius) J is a function of distance! 3.225 © E Fitzgerald-1999 Ferromagnetism M M (T...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 2 pot
Ngày tải lên :
11/08/2014, 14:20
... metals look like free-electron Drude metals • Valence=2 and 3, magnitude and sign suggest problems 3.225 © E.A Fitzgerald-1999 25 13 Response of Free e- to AC Electric Fields • Microscopic picture ... 3.225 © E.A Fitzgerald-1999 Complex Representation of Waves sin(kx-ωt), cos(kx-ωt), and e-i(kx-ωt) are all waves e -i(kx-ωt) is the complex one and is the most general imaginary A θ Acosθ iAsinθ ... Response of e- to AC Electric Fields • Momentum represented in the complex plane imaginary p (ω>>1/τ) p p (ω
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 7 pptx
Ngày tải lên :
11/08/2014, 14:20
... susceptibility All detail of material response is in εr and therefore P 3.225 © E Fitzgerald-1999 Origin of Polarization • • • We are interested in the true dipoles creating polarization in materials (not ... So polarization slows down the velocity of the wave in the material © E Fitzgerald-1999 Compare Optical (index of refraction) and Electrical Measurements of ε Material Optical, n2 Electrical, ε ... E-M waves travel in insulating materials: What is the response of the material (εr) to these waves? 3.225 © E Fitzgerald-1999 Wave Eqn with Insulating Material and Polarization r r ∂B ∇xE = −...
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Structure, magnetic and transport properties of magnetic oxide materials and exploration of magnetic oxides semiconductor (zno) heterostructures
Ngày tải lên :
09/09/2015, 10:15
... of the CoFe2O4 / ZnO /SiO2, and the enlarged (333) diffraction of the CoFe2O4 films with different thicknesses 143 Figure In plane and out of plane hysteresis loops of the CoFe2O4 (40nm) ... nanocrystalline SrRuO3 thin film and its spin glass behavior” Journal of Magnetism and Magnetic Materials (accepted) X.L Huang, Y Yang, J Ding “Structure and magnetic properties of Fe3O4 thin films on ... 300K and 5K 116 XI LIST OF FIGURES Figure 1 The density of state of non-magnetic, ferromagnetic, and half metallic meterials Figure Schematic diagram of Spin filter tunneling Below the TC of...
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Tài liệu Báo cáo khoa học: Interleukin-1-inducible MCPIP protein has structural and functional properties of RNase and participates in degradation of IL-1b mRNA doc
Ngày tải lên :
18/02/2014, 14:20
... mRNA and also of its own transcript For this reason, the level of mRNA for the wildtype form of MCPIP and the level of mRNA for IL-1b (Fig 5A, lane 3) were lower in comparison to the level of mRNA ... clarify the dynamics and features of this protein Role of MCPIP in regulation of the endogenous IL-1b transcript level After identification of a PIN domain in the MCPIP by use of bioinformatics, ... lanes 2,3 and 4, lower band) The levels of mutant and wild-type MCPIP mRNAs were higher when these vectors were co-transfected with a vector overexpressing IL-1b (Fig 5, lanes and 4, upper bands)...
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