Mathematics physics

The purpose of the study is to quantify breast dose to reassure patients and staff that these understandings still apply. A combination of measurements and simulations were used to estimate absorbed breast dose. Gafchromic® XR-QA2 film was used to measure breast dose placed inside the RANDO® phantom in a series of controlled experiments. The RANDO® is an anthropomorphic phantom commonly used for dosimetry investigations. Gafchromic® XR QA2 film is a radiochromic film that changes colour when irradiated. Simulation is commonly used and readily available.

195p runthenight05 01-03-2023 6 3   Download

Bài viết này trình bày về bản chất của phép chứng minh và tiến bộ trong toán học, được khuyến khích bởi bài báo của Jaffe và Quinn, “Theoretical Mathematics: Toward a cultural synthesis of mathematics and theoretical physics” (Toán học lý thuyết: Hướng tới sự tổng hợp mang tính văn hóa của toán học và vật lý lý thuyết).

12p trollhunters 10-01-2022 21 1   Download

This work studies the linear, the third-order nonlinear, and the total optical absorption coefficients (OACs) and the refractive index changes (RICs) caused by both intra-and inter-band transitions in the WSe2 monolayer.

9p meyerowitz 25-12-2021 16 0   Download

The results show that the cerium oxide spherical nanoparticles built from primary nanoparticles with the average size of ~5 nm, exhibited dispersion and uniform size and shapes with their average particle diameter of ~50 nm in size. With such a good morphology, CeO2 material possessed good catalytic activity for the decomposition of methylene blue (MB), in which the material was synthesized at a hydrothermal temperature of 80 oC (CeO2-80) for the best MB decomposition performance.

10p meyerowitz 25-12-2021 5 0   Download

This study analyses eccentrically stiffened sandwich thick plates with the core layer made of negative poisson material. The analytical method based on the first order shear deformation theory (FSDT) is applied to analyse dynamic response and vibration of the plates.

10p meyerowitz 25-12-2021 10 1   Download

This paper considers the problem of a low-velocity normal impact of a rigid cone-shaped upon a viscoelastic plate. The contact force is defined by the modified Hertz's contact law. Approximate solutions of the system of nonlinear integro-differential equations for the contact force and local indentation have been obtained.

7p meyerowitz 25-12-2021 11 1   Download

In this study, Fe50Pd50 nanoparticles with small size of around 5-9 nm were prepared by sonoelectrodeposition in the presence of cetyltrimethylammonium bromide (CTAB) surfactant. The as-prepared nanoparticles were annealed at 550oC for a series of times from 1 h to 6 h.

8p meyerowitz 25-12-2021 8 1   Download

In this report, SERS substrates based on Ag-decorated TiO2 nanofibers electrospun on a glass substrate (Ag/TiO2/glass) were successfully prepared using electrospinning and photodeposition methods. XRD pattern demonstrated that the crystalline structure of TiO2 nanofibers (TiO2 NFs) consisted of both anatase and rutile phase.

9p meyerowitz 25-12-2021 9 0   Download

In this paper, the Finite Element Method (in ANSYS) is used to investigate natural frequency of vibration and bending characteristics under varying pressure loads applied on the top skin when changing fundamental properties of some gradient configurations, including angular gradient, thickness gradient and functional gradient configurations of the auxetic plate with honeycomb structure.

17p meyerowitz 25-12-2021 8 0   Download

Purpose: The purpose of thesis is to study the influence of temperature, pressure and dopant on the diffusion coefficient and ionic conductivity of the bulk material as CeO2, c-ZrO2, YDC and YSZ. For YDC and YSZ thin films, we find the thickness dependence of the lattice constant, diffusion coefficient and ionic conductivity

28p tunelove 10-06-2021 11 2   Download

Objectives: Evaluate the available parameters to take the signal of Higgs and radion in the collisions and decay processes in the future ILC (International Linear Collider) and CLIC (Compact Linear Collider) accelerators.

27p tunelove 10-06-2021 13 3   Download

The thesis proposes a class for the new economic 3-3-1 model, called a simple 3-3-1 model, in order to address the mentioned problems. The simple 3-3-1 model considers the simplest lepton sector and the scalar sector.

35p extraenglish 24-05-2021 18 4   Download

The aim of this thesis is to study electrical transport characteristics of graphene nanostructures. We focus on two research objects associated with two kinds of graphene nanostructures: graphene bipolar junctions (GBJs) and graphene quantum dots (GQDs).

27p extraenglish 24-05-2021 20 4   Download

Purposes of the study: Introduce and clarify the concept "the competency of exploring and obtaining knowledge" through elemental competencies and compatible activities in teaching maths for high school students; Find out the reality and need of improving the competency of exploring and obtaining knowledge in teaching maths for high schools students majoring in physics, chemistry and biology; Build and test the feasibility of pedagogy method applied in teaching maths at high school classes majoring in physics, chemistry, and biology to foster this capacity for students.

27p prisonbreak123 21-05-2021 21 3   Download

The purposes of research "Electronic transport in semiconductor nanostructure based on polar material AlGaN/GaN and Penta-Graphene nanoribbon" studying on electronic transport phenomena in semiconductor nano structures such as AlGaN/GaN and penta-graphene nanoribbon.

37p capheviahe27 23-02-2021 22 4   Download

The purposes of research: Searching of dark matter in the proposed model called the simple 3-3-1 model (S331M); solving the neutrino mass problem and determine the Higgs spectrum in the G221 model with lepton-flavor non-universality.

34p capheviahe27 23-02-2021 10 4   Download

The aim of this thesis is to study electrical transport characteristics of graphene nanostructures. We focus on two research objects associated with two kinds of graphene nanostructures: graphene bipolar junctions (GBJs) and graphene quantum dots (GQDs).

27p capheviahe26 25-01-2021 20 3   Download

Resolve the neutrino mass problem. Parameterize the parameters in the model 3−2−3−1 to seek for dark matter for each version of the model with q=0 and q=−1. Research for Z1 and Z01 at LEPII and LHC. Survey in detail the mass of gauge bosons, Higgs bosons, flavor-changing neutral current in the model 3−3−3−1 and calculate the branch ratio of the decay process mu - ey, u - 3e in the model.

25p larachdumlanat129 20-01-2021 18 4   Download

This paper looks at the influence of SiO2-doped concentration, temperature and pressure on the microstructure of the Al2O3(SiO2)x (ASx) bulk model using the Molecular Dynamics (MD) method with a Born-Mayer pair interaction potential and periodic boundary conditions.

7p tamynhan5 10-12-2020 12 3   Download

We will show that Schrodinger equations for low-dimensional systems can be solved by the method of quantum Diffusion Monte Carlo (DMC). The wave function and energy in a ground state are found for the two-dimensional harmonic oscillator, quantum wells, quantum wires and quantum dots. This is great approach for problems of low-dimensional systems. In this paper, the sign of the wave function is not treated.

7p tamynhan5 10-12-2020 16 2   Download