Vibrational properties

Part 1 book "Introduction to solid state physics" includes contents: Crystal structure, wave diffraction and the reciprocal lattice, crystal binding and elastic constants, phonons i - crystal vibrations, phonons ii - thermal properties, free electron fermi gas, energy bands, semiconductor crystals, fermi surfaces and metals, superconductivity.

316p dianmotminh01 17-05-2024 5 3   Download

In this paper, the free vibration of a bi-directional functionally graded (2D-FG) nanobeams is investigated by the finite element method. Nanobeams are made of two kinds of porous materials. The material properties of 2D-FG nanobeams are assumed to vary in both axial and thickness directions according to a power law . Based on Eringen's nonlocal elasticity theory, the governing equations of motion are derived.

10p dathienlang1012 03-05-2024 0 0   Download

his paper investigates the nonlinear vibration of imperfect smart sandwich plate which consists of an auxetic graphene reinforced metal matrix composite (GRRMC) core layer integrated with two magneto-electro-elastic face sheets. The Poisson’s ratio of the GRMMC core is negative while the material properties of magneto-electro-elastic face sheets depend on the volume fraction of piezoelectric and piezomagnetic phases.

10p dathienlang1012 03-05-2024 1 0   Download

The authors propose a novel BCMO-DNN algorithm for vibration optimization of functionally graded porous microplates. The theory is based on a unified framework of higher-order shear deformation theory and modified strain gradient theory. A hybrid combination of deep learning neural network and balancing composite motion optimization is developed to solve the optimization problems and predict stochastic vibration behaviors of functionally graded porous microplates with uncertainties of material properties.

12p dathienlang1012 03-05-2024 3 0   Download

This work focuses on the free vibration of the functionally graded porous (FGP) sandwich microplates using the isogeometric approach (IGA). The FGP sandwich plate comprises the homogeneous core and the FG porous face sheets. The material properties of the FGP face sheets are supposed to vary through the thickness direction according to the power-law function and modified rule of a mixture of the volume fraction with three different types of porosity distribution: homogeneous porous, X porous and V porous distributions.

11p dathienlang1012 03-05-2024 2 0   Download

The paper "Nonlinear vibration of functionally graded porous micro-beams resting on elastic foundation" presents the analysis of nonlinear vibration of functionally graded porous (FGP) micro-beams resting on an elastic foundation. The Euler-Bernoulli beam theory (EBT) and the nonlocal strain gradient theory (NSGT) are considered to establish the equations of motion of the micro-beam. The material properties of the micro-beam are assumed to be changed continuously along thickness direction according to simple power-law distribution.

9p dathienlang1012 03-05-2024 1 0   Download

The paper "Forced vibration of FG-CNTRC sandwich beams excited by a moving mass" investigates forced vibration of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) sandwich beams excited by a moving mass. The core of the beams is homogeneous while the two faces are of CNTRC material. The effective properties of two CNTRC face sheets are determined by an extended rule of mixture.

10p dathienlang1012 03-05-2024 0 0   Download

This study focuses on examining the effect of the π bridge on the properties of the molecule. The structural parameters of the molecular geometry were optimized, the HOMO and LUMO energies were calculated and analyzed in detail. In addition, the absorption wavelength, excitation energy, vibration intensity and electron transfer were calculated through the time-dependent density functional theory (TD-DFT) method.

6p dianmotminh02 03-05-2024 4 2   Download

A damage diagnosis method for trusses based on incomplete free vibration properties utilizing ensemble learning, e.g. Extreme gradient boosting (XGBoost), is presented in this work. Owing to the lack of measurement sensors, modal features are only measured at master degrees of freedom (DOFs) of a few first models instead of all DOFs of a structural system.

12p viohoyo 25-04-2024 3 2   Download

Ebook "Highly luminescent lanthanide complexes with specific coordination structures" deals with strongly luminescent lanthanide complexes having novel coordination structures. Luminescent lanthanide complexes are promising candidates as active materials for EL devices, lasers, and bio-sensing applications. The organic ligands in lanthanide complexes control geometrical and vibrational frequency structures that are closely related to the luminescent properties.

100p tudohanhtau1006 29-03-2024 3 1   Download

Ebook "New synthetic routes to polyoxometalate containing ionic liquids: An investigation of their properties" carried out fundamental investigations into the development of polyoxometalate based ionic liquids (POM-ILs). The POM-ILs were obtained by charge balancing inorganic polyoxometalate (POM) anions with sterically demanding tetraalkylammonium or tetraalkylphosphonium cations.

138p tudohanhtau1006 29-03-2024 3 1   Download

Ebook "A structural and vibrational investigation into chromylazide, acetate, perchlorate, and thiocyanate compounds" reviews the structural and vibrational properties of chromyl azide, acetate, perchlorate, and thiocyanate from a theoretical point of view by using Density Functional Theory (DFT) methods. These compounds are extensively used in organic syntheses and the study of their structure and spectroscopy has become fundamental.

91p coduathanh1122 27-03-2024 1 1   Download

Ebook "A structural and vibrational study of the chromyl chlorosulfate, fluorosulfate, and nitrate compounds" presents important studies related to the structural and vibrational properties on the chromyl compounds based on Ab-initio calculations. The synthesis and the study of such properties are of chemical importance because the stereo-chemistries and reactivities of these compounds are strongly dependent on the coordination modes that adopt the different ligands linked to the chromyl group.

90p coduathanh1122 27-03-2024 3 1   Download

Ebook Fundamentals of semiconductors - Physics and materials properties (Fourth edition): Part 1 includes content: Introduction; electronic band structures; vibrational properties; electronic properties of defects.

222p muasambanhan07 18-02-2024 5 1   Download

Part 1 book "Fundamentals of semiconductors - Physics and materials properties" includes content: Introduction, electronic band structures, vibrational properties, electronic properties of defects, electrical transport.

261p muasambanhan07 18-02-2024 2 1   Download

Part 1 book "Solid state physics - Problems and solutions" includes content: Crystal structure;, interatomic forces, lattice vibrations; electronic band structure; density of states; elementary excitations; thermodynamics of noninteracting quasiparticles; transport properties; optical properties; interactions and phase transitions.

116p muasambanhan07 18-02-2024 2 1   Download

Part 2 book "Solid state physics - Problems and solutions" includes content: Crystal structures; interratomic forces, lattice vibrations; electronic band structure; density of states; elementary excitations; thermodynamics of noninteracting quasiparticles; transport properties; optical properties; interactions and phase transitions;

157p muasambanhan07 18-02-2024 4 1   Download

Part 2 book "Structural dynamics" includes content: Framed structures modeled as discrete multi degree of freedom systems; structures modeled with distributed properties; special topics - fourier analysis, evaluation of absolute damping, generalized coordinates; random vibration; earthquake engineering.

304p muasambanhan06 01-02-2024 2 1   Download

In this paper, solutions to apply the Kalman filter to handle ground vibration wave data due to blasting were introduced. The work is done based on considering the properties and factors affecting the amplitude, frequency, and characteristics of ground vibration waves.

11p viplato 02-01-2024 7 2   Download

Part 1 book "Solid state physics principles and modern applications" includes content: Lattice vibrations, free electron theory of metals, elements of band theory, use of elementary group theoryin calculating band structure, more band theory and the semiclassical approximation, semiconductors, dielectric properties of solids, magnetism in solids.

281p muasambanhan02 18-12-2023 4 3   Download