4 properties of materials

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 4 pps

Ngày tải lên : 11/08/2014, 14:20

... 3.56 / 3.16 1685 / 1770 1.1 / 5 .42 / 5 .46 1231 / 1510 / ? 0.72 / 1.35/ ? 5.66 / 5.65 / ? 508 / 798 / ? 0.08 /0.18 / 1 .45 6 .45 / 6.09 / ? MP (°K) ∗ Fill in as many of the question marks as you can ... Mobility Trends Material Eg(eV)°K µn(cm2/V·s) GaN 3.39 150 AlAs 2.3 180 GaP 2 .4 2,100 GaAs 1.53 16,000 InP 1 .41 44 ,000 InAs 0 .43 120,000 InSb 0.23 1,000,000 Remember that: 3.225 µ= eτ m* and 1 ∂2E = ... separation of variables; each variable gives a separation constant φ separation yields ml θ gives l r gives n After solving, the energy E is a function of n E= − µZ e − 13.6eV = 2 n2 (4 ε o ) 2h...

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MECHANICAL PROPERTIES OF MATERIALS 2008 ppt

Ngày tải lên : 24/03/2014, 05:20

... graphite E (GPa) 72 .4 85.5 1 24 400 253 520 σb (GPa) 2 .4 4.5 3.6 3.5 4. 5 2 .4 b (%) 2.6 2.0 2.3 1.0 1.1 0.6 ρ (Mg/m3 ) 2. 54 2 .49 1 .45 2 .45 1.80 1.85 E/ρ (MJ/kg) 28.5 34. 3 86 163 140 281 σb /ρ (MJ/kg) ... 25 32 37 41 Composites 3.1 Materials 3.2 Stiﬀness 3.3 Strength 3 .4 Problems 43 43 44 47 48 51 ... measure of a material’s mechanical properties, and all students of Mechanics of Materials will encounter them often However, they are not without some subtlety, especially in the case of ductile materials...

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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

... 200 C 46 3/ 544 ; 622 K 327 40 4.8 C 3 54/ 478– 543 K 45 0 /47 4–538 K 542 –559 K 298 /47 3 K 298 /47 3 K 41 8 /48 4– 647 K 311 /47 8–553 K 267.2 C 311 /47 8–550 K 311 /48 0–561 .4 K 12/177–237 C 0.83/196– 240 C 43 /188–295 ... 573.2–613.2 K 3 74/ 475–569 K 298 /42 3; 47 3 K 311 /47 8–5 84 K 298 /47 3 K 3 74/ 475–599 K 340 40 0 C 298 /47 3 K 42 0 /47 4– 542 K 298 /47 3 K 311 /47 8–583 K 298 /47 3 K 298 /47 3 K 150/200; 250 C 300; 350; 40 0 C 3 74/ 475–596 ... 503–857 K 42 9 /47 4–519 K 637.2–659 K 5 34 843 K 48 8–827 K 45 1 /48 1–818 K 45 6 /48 4–809 K 42 2 /47 9–771 K 323 /47 3 K 100/150–250 C 573–622 K 200–350 C Sampl Sampl 41 4 /47 2 .4 525.5 K 47 3; 573 K 45 6 /48 7–722 K...

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Chapter 4: Properties of Regular Languages

Ngày tải lên : 13/05/2014, 10:21

... Homework • Exercises: 2, 4, 6, 8, 9, 11, 18, 22 of Section 4. 1 - Linz’s book • Exercises: 1, 2, 3, 5, of Section 4. 2 Linz’s book • Exercises: 3, 4, 5, 6, 8, 10, 12 of Section 4. 3 - Linz’s book ... homomorphism to each Σ symbol of r Example 4. 4 Σ = {a, b} Γ = {b, c, d} h(a) = dbcc h(b) = bdc r = (a + b*)(aa)* h(r) = (dbcc + (bdc)*)(dbccdbcc)* Theorem 4. 3 The family of regular languages is closed ... = qi δ*(qi, y) ∈ F and y ∈ L2 Theorem 4. 4 The family of regular languages is closed under right quotient: If L1 and L2 are regular, then so is L1/L2 Proof • M = (Q, Σ, δ, q0, F) accepts L1 M^...

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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 ... Chemoresistor Photoconductor Magnetoresistor © H.L Tuller-2001 Origin of Conduction Range of Resistivity Why? 3.225 © E.A Fitzgerald-1999 Response of Material to Applied Potential I I V V=f(I) Rectification, ... 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

... order of 10, the binding energy of the carrier to the center is

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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

... Choice of Piezoelectric Materials • Temperature limitations of piezoelectric materials Material Max Operating Limitations o Temperature ( C) Quartz 45 0 High loss LiNbO3 300 Decomposition Li2B4O7 ... SiO2 layer (1 µm) • Substrate: Si wafer 20 40 60 80 110 100 90 80 70 60 50 40 30 20 10 -10 110 100 90 80 70 60 50 40 30 20 10 -10 20 MFC2 Feuchte Temp CO 40 NO2 NO2kl 60 NH3 H2 Pt-100 resistance ... Decomposition Li2B4O7 500 Phase transformation GaPO4 933 ? Phase transformation La2Ga5SiO4 (Langasite) 147 0 ? Melting point 3.225 © H.L Tuller-2001 24 12 Design Considerations • Bulk conductivity...

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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

... microprobe Probes 15µm thick 2-4mm long (Najafi and Hetke, IEEE Trans Biomed Eng 37, 47 4 (1990).) 3.225 28 14 Measurement of Gas Sensor Performance • Gas sensing materials: Sputtered ZnO film ... Influence of Dopants on Electrical Conductivity of SrTiO3 log(σ / (Ωcm)-1 ) λ 0.995 1,005 T = 800 °C no -1 ac -2 ce pto -3 rd op rd op ed ed -4 Sr2+ Ti4+ O2-3 -5 acceptor donor -20 -16 -12 -8 -4 log(pO2 ... (Massachusetts Institute of Technology) Sputtered SnO2 film (60 nm) (Fraunhofer Institute of Physical Measurement Techniques) • Target gases: Electrical Measurement H2, CO, NH3, NO2 , CH4 • Operating temperature:...

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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

... energy and contribute to properties TF~104K (Troom~102K), EF~100Eclass, vF2~100vclass2 3.225 © E Fitzgerald-1999 Effect of Temperature (T>0): Coupled electronic-thermal properties in conductors ... L π h k πh N= g(E)=density of states=number of electron states per energy per length n= • • N 2k F 2mEF nπ = = or k F = π hπ L n, the electron density, the number of electrons per unit length ... 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 (k x2 + k y ) E(kx,ky) 2m ky kx 3.225 © E Fitzgerald-1999 Representation of...

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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 ... eVbi k bT n p = nn e − eVbi k bT © E Fitzgerald-1999 Qualitative Effect of Bias • • • Applying a potential to the ends of a diode does NOT increase current through drift The applied voltage upsets ... ) xn = E=∫ 2ε r ε oVbi Na e Nd (Nd + Na ) W= 2ε r ε oVbi N a + N d e Nd Na © E Fitzgerald-1999 14 What is the built-in voltage Vbi? p n np eVbi nn pp Ec EF eVbi Ev pn eVbi=EFn-EFp  p E Fp = −...

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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

... the ground state 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 ... 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 ... ω~1010 microwave oven, transmission of E-M waves 3.225 © E Fitzgerald-1999 19 Dielectric Constant vs Frequency • Completely general ε due to the localized charge in materials ε molecules αo ions αi...

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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

... increases inductance  4  Φ B = BA ~ 4 MA = 4 χHA = 4 χ  In  A  c  NΦ B (4 ) = n lAχ I c L= L increased by ~χ due to magnetic material Material Type χ Paramagnetic +10-5-10 -4 Diamagnetic -10-8-10-5 ... 3.225 © E Fitzgerald-1999 The Inductor ∇× B = 4 ∂E J+ c c ∂t ∫ ∫ ∇ × BdS = ∫ B ⋅ dl = 4 4 ∫ ∫ J ⋅ dS = c I c 4 In c N = n ⋅ length = nl Nφ B N ( BA) 4 L= n lA = = I I c B= 3.225 © E Fitzgerald-1999 ... material Magnetic dipoles in material can line-up in magnetic field B = H + 4 χH = H + 4 M ∂M = χ µ = + 4 χ M = χH ∂H B = 4 M + B = µH B magnetic induction χ magnetic susceptibility H magnetic field...

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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

... waves! SI Units (MKS) Gaussian Units (CGS) r ∇ • D = 4 ρ r ∇•B = r r ∂B ∇xE = − c ∂t r r 4 r ∂D ∇xH = J+ c c ∂t r r r D = E + 4 P r r r B = H + 4 M r ∇•D = ρ r ∇•B = r r ∂B ∇xE = − ∂t r r r ∂D ∇xH ... 7.5 x 10 14 Hz) λ = c/ν = 40 0 nm k=2π/ λ = 1.57 x 107 m -1 ω = π ν = 4. 71 x 1015 s-1 For constant phase: (kx-ωt) v phase = ω k = c → c = (µ 0ε )−1 3.225 After Livingston 12 Waves in Materials; ... ε=εrε0 εr=1 τ ≈ 10 − 14 sec,νλ = c,ν = 3x1010 cm / sec ≈ 10 14 Hz 5000 x10 −8 cm E-fields with frequencies greater than visible light frequency expected to be beyond influence of free electrons 3.225...

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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 ... phones λ= 14- 33cm DBS (TV) λ=2.5cm Fiber optics λ=1.3-1.55µm ‘MMIC’, pronounced ‘mimic’ mm wave ICs In communications, many E-M waves travel in insulating materials: What is the response of the material ... 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...

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sliek môn máy tự động chương 4 properties of regular languages

Ngày tải lên : 23/10/2014, 17:47

... Chapter 4: Properties of Regular Languages Proof of Theorem 4. 1 - Linz ’s book M = (Q, , δ, q0 , F ) accepts L1 M = (Q, , δ, q0 , Q − F ) accepts L1 Chapter 4: Properties of Regular Languages Proof ... b p4 p2 Chapter 4: Properties of Regular Languages Example 4. 2 L1 ∩ L2 q1 p0 a a q0 p1 q0 p2 a a q1 p2 q1 p1 a q0 p0 a b b q2 p3 b q2 p4 Chapter 4: Properties of Regular Languages Theorem 4. 2 ... symbol of r Chapter 4: Properties of Regular Languages Example 4. 4 = {a, b} Γ = {b, c, d} h(a) = dbcc and h(b) = bdc r = (a + b ∗ )(aa)∗ h(r) = (dbcc + (bdc)∗ )(dbccdbcc)∗ Chapter 4: Properties of...

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Mechanical Properties of Engineered Materials 2008 Part 4 pps

Ngày tải lên : 11/08/2014, 15:20

... invariant of the stress tensor can be obtained from the algebraic sum of the cofactors of the three terms in any of the three rows or columns of the stress tensor This gives the same value of I2 ... interfacial properties of composites by the careful engineering of interfacial dimensions and interfacial phases to minimize the levels of interfacial residual stress in different directions 3 .4 MOHR’S ... important in the design of composite materials This is because of the large differences that are typically observed between the thermal expansion coefﬁcients of different materials Composites must,...

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Static properties of granular materials Philippe Claudin

Ngày tải lên : 01/11/2013, 08:20

... found in Refs. [44 7, 44 6, 41 2] 240 Static properties of granular materials Fig 14. 6 Polar representation of the contact orientation distribution obtained in a numerical simulation of a granular ... exponential tails [41 9, 42 2, 44 4, 3 84] 14. 2 Large-scale properties In this second section of the chapter, we would like to present large scale properties of static granular pilings As a matter of fact, ... see e.g [45 7, 46 0] However, the stress response of ordered packings [40 7, 40 9, 44 1, 387] as well as disordered anisotropic isostatic systems and models [47 2, 47 3, 41 4, 43 9, 368, 40 2, 363] show...

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Tài liệu Mechanical Properties of Engineered Materials P2 pptx

Ngày tải lên : 23/12/2013, 00:15

... and 2.8(f) These may be thought of as the absence of a plane of atoms (intrinsic stacking faults) or the insertion of rows of atoms that disturb the arrangement of atoms (extrinsic stacking faults) ... time-dependent ﬂow of materials at temperatures greater than $0.3–0.5 of the melting temperature in degrees Kelvin Also, the activation energy, Q, in Eq (2.10) is indicative of the actual mechanism of diffusion, ... constant of integration For an initial grain size of D0 at time t ¼ 0, we may deduce that c ¼ D2 Hence, substituting the value of c into Eq (2.13) gives D À D0 ¼ kt ð2: 14 Equation (2. 14) has...

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Tài liệu Mechanical Properties of Engineered Materials P1 pptx

Ngày tải lên : 23/12/2013, 00:15

... Inc 13.6 13.7 13.8 13.9 13.10 13.11 13.12 13.13 13. 14 14 Fatigue of Materials 14. 1 14. 2 14. 3 14. 4 14. 5 14. 6 14. 7 14. 8 14. 9 14. 10 14. 11 14. 12 14. 13 15 Crack-Tip Blunting Crack Deflection Twin Toughening ... Definitions of Stress and Strain 3.1 3.2 3.3 3 .4 3.5 3.6 3.7 3.8 3.9 Introduction to Elastic Behavior 4. 1 4. 2 4. 3 4. 4 4. 5 4. 6 4. 7 4. 8 Introduction Basic Definitions of Stress Basic Definitions of Strain ... mechanical properties of materials It is not intended to be a comprehensive review of all the different aspects of mechanical properties; such a task would be beyond the capabilities of any single...

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Báo cáo khoa học: Puriﬁcation and properties of a new S-adenosyl-Lmethionine:ﬂavonoid 4¢-O-methyltransferase from carnation (Dianthus caryophyllus L.) pot

Ngày tải lên : 08/03/2014, 08:20

... Dianthi Phytochem 41 , 44 7– 45 0 Carotenuto, A., Fattorusso, E., Lanzotti, V., Magno, S., De Feo, V & Cicala, C (1997) The ﬂavonoids of Allium neapolitanum Phytochemistry 44 , 949 –957 10 Stockigt, ... routinely the F 4 -OMT activity on the base of the amount of its kaempferide methylated derivative (tR 4. 68 min) formed in the course of time Fig 10 Lineweaver–Burk plot of F 4 -OMT activity ... (20.1 kDa) and lysozyme ( 14. 4 kDa) Ó FEBS 2003 342 6 P Curir et al (Eur J Biochem 270) pI determination The pI of puriﬁed F 4 -OMT was determined through PAGE isoelectrofocusing (IEF), using the...

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