0° at the magnetic equator to 90° at the magnetic poles the total magnetic fiel
DSpace at VNU: On the amplifiction of sound (acoustic phonons) by absorption of laser radiation in cylindrical quantum wires with parabolic potential in the presence of magnetic field
Ngày tải lên :
14/12/2017, 19:52
... £ is the deformation acoustic potential, f) is the density of the m aterial, v s is the sound velocity in the m aterial, R is the wire’s radius, I n i n ’ I’ is the form factor Prom Ham iltonian ... intensity of the laser radiation field (A = — ), shows th a t the amplification of sound depends on the intensity of the radiation field w ith order greater than two, while the dependence in the case ... obtained in the case of singlephoton absorption and m ultiphoton absorption In proper conditions, the rate of acoustic-phonon excitations is negative and the phonon population grows w ith time The numerical...
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DSpace at VNU: Dependence of the Hall Coefficient on Doping Concentration in Doped Semiconductor Superlattices with a Perpendicular Magnetic Field under the Influence of a Laser Radiation
Ngày tải lên :
16/12/2017, 03:45
... shows the dependences of the magnetoresistance ρxx on the magnetic field at different values of the temperature We can see the appearance of the typical Shubnikovde Haas oscillations with the period ... calculation and Eq (7) In Fig 2(a), the magnetoresistance is plotted as a function of the magnetic field for two cases: the absence and the presence of the EMW There occurs the beat phenomenon in the ... concentration for two cases: the absence and the presence of the EMW The HC can be seen to oscillate and decrease with increasing the doping concentration It is also seen that the presence of the...
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DSpace at VNU: INVESTIGATION OF THE HALL EFFECT IN RECTANGULAR QUANTUM WELLS WITH A PERPENDICULAR MAGNETIC FIELD IN THE PRESENCE OF A HIGH-FREQUENCY ELECTROMAGNETIC WAVE
Ngày tải lên :
16/12/2017, 06:12
... (strong magnetic fields) and low temperatures, the Boltzmann kinetic equation is invalid Therefore, we need to use quantum theory to investigate both the weak magnetic field and the quantized magnetic ... subjected to a crossed electric field and magnetic field in the presence of a sound wave.10 The acoustomagnetoelectric field is similar to the Hall field in bulk semiconductors where the sound ... HC is seen to decrease with increasing the magnetic field and reach saturation at large magnetic fields (> 10 T) The saturation of the HC with magnetic field has been observed experimentally...
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DSpace at VNU: Magnetic field effects on the binding energy of hydrogen impurities in quantum dots with parabolic confinements
Ngày tải lên :
16/12/2017, 09:45
... material, and A is the vector potential of the magnetic "eld B (B"rot A) The atom is here assumed to be located at the center of QD, which is also chosen as the origin of coordinates system The spin term ... determined by the magnetic "eld rather than by the con"ning potential that results in similar behaviors of all the curves at *0.1 It is here useful to recall that for the GaAs-QDs the value "0.15 ... The most impressive ! ! feature found in the "gure is that with increasing ¸ the energy E at the beginning falls steeply, and ! ! then ceases to fall further at ¸ +5 (all the curves of ! E ( ) for...
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DSpace at VNU: The contribution of the exchange biased field direction in multilayer thin films to planar Hall resistance
Ngày tải lên :
16/12/2017, 15:39
... good concurrence at β = 19o This means that the exchange bias field of selected sample has some deviation from the longitudinal axis of the sample due to the demagnetization field and interlayer ... direction of the applied field for a ferromagnet, the magnetization In Eq (3), it is shown that the spontaneous magnetoresistivity is a function of the relative direction of M and J Normally, the PHE ... stat sol (b) 244, No 12 (2007) 4433 external magnetic field and easy axis, and the β is the angle between the exchange biased field direction and the easy axis of the free layer During calculations,...
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DSpace at VNU: Transport properties of the two-dimensional electron gas in AlP quantum wells at finite temperature including magnetic field and exchange-correlation effects
Ngày tải lên :
17/12/2017, 14:30
... from the dependence of the LFC on the spinpolarization At low density, the dependence of the resistance ratio on the LFC decreases when temperature increases and the temperature effect is remarkable ... by the impurity density ni ¼n and the distance zi of the impurity layer from the QW edge at z¼0, is shown in Fig We observe that, the LFC is very important at low density On the other hand, the ... IRS, the effects of both the LFC and temperature on τt =τs are nearly canceled in the ratio At low density, the dependence of the resistance ratio Bs ị=B ẳ 0ị on the LFC decreases when temperature...
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Tài liệu Proceedings of Physical Phenomena at High Magnetic Fields - IV ppt
Ngày tải lên :
12/02/2014, 16:20
... National High Magnetic Field Laboratory, Florida State University, USA L P Gor'kov National High Magnetic Field Laboratory, Florida State University, USA A Lacerda Los Alamos National Laboratory, ... hence that the v=4/ll state is always spin polarized The assertion is further strengthened by the observation of the v=4/l state at a magnetic field as high as 33T, shown in Fig 3, taken in the Hybrid ... fractions The strong Rxx minima at v=4/l and the accompanying developing Hall plateau point to the formation of FQHE states at this fraction Figure 2(b) is the T-dependent data for the v=4/ll state...
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investigation of the total supply chain issues at lam son joc
Ngày tải lên :
25/11/2016, 09:51
... "Supply chain strategies require a total systems view of the links in the chain that work together efficiently to create customer satisfaction at the end point of delivery to the consumer As a ... during the interview are categories but not limited to the issues of total supply chain process The secondary data will be gathered through literature in order to identify the problems, databases, ... CORPORATE CONTEXT 16 THE TOTAL SUPPLY CHAIN AT LAM SON JOC 19 PART 2: THE TOTAL SUPPLY CHAIN MANAGEMENT INVESTIGATION AND RECOMMENDATIONS 22 CHAPTER 1: THE TOTAL...
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DSpace at VNU: The total specialization of modules over a local ring
Ngày tải lên :
14/12/2017, 16:56
... e The definition o f ộtỵ does not depend on the choice o f the bases o f F, G in the sense that if B is the matrix o f Ộ with respcct to other bases o f F, G , then there arc bases o f the m.atrix ... a maximal u pi- Therefore, it exists j such that q c p j Then pi c p j, contradiction i= l Hence m = p i(/? a )r The natural candidate for the total specialization o f Rp^ is the sem i-local ... ) r a to ta l sp ecia liza tio n o f Rfi, w ith respect to a For short vvc will put = Rp^, S a = { Ra) p and S t = { Ra ) T, where p is one o f the pj Then there is ( S r i p r - The total sp...
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DSpace at VNU: Magnetoelectric sensor for microtesla magnetic-fields based on (Fe80Co20)(78)Si12B10 PZT laminates
Ngày tải lên :
16/12/2017, 00:03
... magnetic- field orientation sensing one To determine the strength of the dc magnetic- field, the sensor is simply used in the configuration of the dc magnetic- Fig Sensor construction: FeCoBSi/PZT laminate (a), ... understood in term of the strong relation between ME voltage and the magnetostrictive susceptibility (d /dH) of the magnetic ribbon, VME ∼ d /dH [5] The vanishing of VME can be attributed to the ... ) The periodical variation of the output signal with respect to ϕ opens the ability to use this sensor for detecting the orientation of the external magnetic- field For this purpose, we prefer to...
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DSpace at VNU: Existence Results for the Einstein-Scalar Field Lichnerowicz Equations on Compact Riemannian Manifolds in the Null Case
Ngày tải lên :
16/12/2017, 00:24
... solving the Cauchy problem in general relativity through the conformal method Due to the nature of their origin, Eq (1.1) has recently received much considerable attention from the mathematical ... Laplace-Beltrami operator, = 2n/(n − 2) is the critical Sobolev exponent, and h, f, a ( 0) are smooth functions in M In the literature, Eq (1.1) is motivated by the Hamiltonian constraint equations naturally ... understood However, it is worth noticing that the number λ f tends to if the set {x ∈ M : f (x) = 0} tends to M In addition, we suspect that the constant C4 should be λ f , unfortunately, all our attempts...
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DSpace at VNU: Transport properties of a quasi-two-dimensional electron gas in a SiGe Si SiGe quantum well including temperature and magnetic field effects
Ngày tải lên :
16/12/2017, 09:10
... Here n = n+ + nÀ is the total density and Bs is the so-called saturation field given by glBBs = 2EF where g is the electron spin g-factor, lB is the Bohr magneton and EF is the Fermi energy For ... scattering Up to now, we have considered only RIS To evaluate the importance of other scattering mechanisms we have calculated the mobility lo and the resistance ratio q(Bs)/q(B = 0) for IRS The results ... of the impurities from the 2DEG The dependence of the critical density nMIT on the well width for zi = Àa, is much stronger compared to the case with zi = a/2 3.3 The magnetic field and temperature...
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DSpace at VNU: Effect of the crystalline electric field on the Neel temperatures of RCu2 compounds
Ngày tải lên :
16/12/2017, 10:19
... )2 is the expectation value of X + !#$ J under the in#uence of CEF Hamiltonian alone X at the temperature ¹ The exchange parameter, , + can be evaluated from the ordering temperature of the Gd ... calculated directly using the CEF Hamiltonian (4) with only the two lowestorder terms For the RCu compounds with R"Tb, Dy and Ho, we used the CEF Hamiltonian transformed in the new coordinate ... calculations with the full CEF Hamiltonian as discussed in the text The dashed line represents the de Gennes rule to be somewhat higher than the one obtained from experiments We tried also to derive...
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DSpace at VNU: The quantum acoustomagnetoelectric field in a quantum well with a parabolic potential
Ngày tải lên :
16/12/2017, 11:05
... on the magnetic field for the case of the weak magnetic field at different values of the lattice temperature The dependence of the AME field on the magnetic field at different values of the temperature ... the deformation potential constant; aỵN;~k and aN;~k are the creation and the annihilation operators of ki and jN ; ~ k ỵ~ qi the electron, respectively; b~q is the annihilation operator of the ... states before and after interaction, U N;N0 ðqÞ is the matrix element of the operator 1=2 U ¼ expðiqy À kl zị; kl ẳ q2 x2q =c2l is the spatial attenuation factor of the potential part the...
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Tài liệu Adobe Photoshop 7.0 Nhóm các công cụ tô vẽ (ereasers, line , history & Art Brush Tool) ppt
Ngày tải lên :
13/12/2013, 00:15
... thị to n mẫu hayphân loại theo chủ đề loại Adobe Photoshop 7.0 78 - Để nạp to n mẫu cọ PTS, ta chọn ALL, nạp to n mẫu có bảng mẫu Nh có mẫu bảng sau: Công cụ History Brush Tool & Art History ... Layer Paths: chọn đối tượng thao tác lưu vào đường dẫn (path) Fill Pixel: chọn thuộc tính đổ trực tiếp đối tượng ảnh Pen tool: bút vẽ đường tự chọn Adobe Photoshop 7.0 75 - Freeform Pen tool: ... Rectangle Tool: dùng để vẽ hình chữ nhật hình vng Rounded Rectangle Tool: dùng để vẽ hình chữ nhật hình vng bo tròn góc theo giá trị Radius Ellipse Tool: dùng để vẽ hình tròn hình Ellipse 10 Polygon Tool:...
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Tài liệu Essay Writing for a Score of 6.0 on the TOEFL and TWE pdf
Ngày tải lên :
23/01/2014, 06:20
... score separately The readers will score the essay with a rating of to In this program we are going to discuss the score of ONLY because that is what you will strive for Let us look at what the readers ... how to write the thesis, and - what the three main reasons are to write on in the body of the essay With this knowledge, write the essay: - first, make an outline of the essay; - then develop the ... your thesis statement, the most important sentence in your essay The thesis statement gives your answer and the reasons why you chose that answer B The body: The body of your essay is also the...
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Pro C# 5.0 and the .NET 4.5 Framework pot
Ngày tải lên :
06/03/2014, 03:20
... opinion as to whether or not they are subject to proprietary rights While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors ... 809 The Role of the IDbDataParameter and IDataParameter Interfaces 810 The Role of the IDbDataAdapter and IDataAdapter Interfaces 811 The Role of the IDataReader and IDataRecord ... Data in a DataSet 872 Processing DataTable Data Using DataTableReader Objects 873 Serializing DataTable/DataSet Objects As XML 874 Serializing DataTable/DataSet Objects...
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COOPERATIVE STEWARDSHIP: Managing the Nation’s Multidisciplinary User Facilities for Research with Synchrotron Radiation, Neutrons, and High Magnetic Fields ppt
Ngày tải lên :
06/03/2014, 15:20
... pressure—that affects the properties of matter; the stronger the fields, the greater the effect High -magnetic- field facilities enable researchers to examine the response of matter to very strong magnetic ... third-generation facilities (the 15 16 COOPERATIVE STEWARDSHIP ALS at Lawrence Berkeley National Laboratory and the APS at Argonne National Laboratory) and two second-generation facilities (the NSLS at ... Upgrades The United States has only one national high -magnetic- field user facility, the National High Magnetic Field Laboratory (NHMFL) Support for the first national user facility, at the Francis...
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