Theoretic and mathematic physics

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 18 0   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 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 19 4   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 18 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 16 4   Download

Using ab-initio calculations at the MP2/6-311G(3df, 2pd), a very high level theory, we obtained minimum energy structures for the C2H5O radical, products and transition states of reactions on the potential energy surface.

7p tamynhan9 02-12-2020 17 1   Download

Based on the Cornwall-Jackiw-Tomboulis effective action approach, a theoretical formalism is established to study the hydrodynamic instabilities in two-component condensates of Bose gases. The effective potential is found in the Hartree-Fock approximation and this quantity is then used to derive the expression for the pressure, which depends on particle densities.

8p tamynhan9 02-12-2020 13 4   Download

The structural calculations such as band structure, density of states and optical properties were carried out under the framework of the Density Functional Theory (DFT). A theoretical analysis by computer simulation is expected to clarify the doping effects in detail and compare well with experimental results.

7p tamynhan9 02-12-2020 12 1   Download

Numerical calculations of the quantities were performed for Fe and W thin films and found to be in good and reasonable agreement with other theoretical results and experimental data. This research proves that thermal expansion coefficients of thin films approach the values of bulk when thin film is about 70 nm thick.

10p tamynhan9 02-12-2020 17 1   Download

The α - β (fcc-hcp) phase transition temperature under pressure can be investigated theoretically by combining the self-consistent field method and the statistical moment method and only the statistical moment method which was developed by the authors. Theoretical results are applied to N2 and CO molecular cryocrystals and our calculated results are compared with the experimental data and other calculations.

8p tamynhan8 04-11-2020 13 1   Download

Besides introduction and conclusion, this thesis consists of 3 chapters. Chapter 1. Overview of Bose-Einstein condensate. Theory of BECs.Chapter 2. Interfacial tension and wetting phase transition in the system of BECs limited by one hard wall. Chapter 3. Finite-size effects of interfacial tension in the system of BECs limited by two hard walls.

28p cumeo2009 24-07-2018 43 2   Download

The parametric transformation of acoustic and optical phonons in doped superlattices is theoretically studied by using a set of quantum kinetic equations for the phonons. The analytic expression of parametric transformation coefficient of acoustic and optical phonons in doped superlattices is obtained, that depends non-linear on the concentration of impurities. Numerical computations of theoretical results and graph are performed for GaAs:Si/GaAs:Be doped superlattices

6p tuanlocmuido 19-12-2012 43 4   Download

The PageRank algorithm, used in the Google search engine, greatly improves the results of Web search by applying probabilistic model on the link structure of Webs to evaluate the “importance” of Webs. In PageRank probabilistic model, the links and webs are uniform, so the rank score of webs are quite independent from their content. In practice, the researchers often hope that the web results can be ranked by their proposed topics. Moreover, when computer’s techniques solve given problems ineffectively, it’s necessary to do better research in theoretical problems. ...

12p tuanlocmuido 19-12-2012 37 2   Download

Bremsstrahlung energy spectrum from thin W target produced by 15 MeV incident electrons was determined by a combination of measurements and theoretical calculation. The shape of spectrum was calculated by Monte-Carlo method using the code EGS4. The photon flux measurements were performed based on the activation technique using the high pure metallic foils. The radioactivities of the irradiated foils were measured by using a gamma spectrometer with a high energy resolution HPGe detector.

7p tuanlocmuido 19-12-2012 55 4   Download

The effective application of Markov chains has been paid much attention, and it has raised a lot of theoretical and applied problems. In this paper, we would like to approach one of these problems which is finding the long-run behavior of extremely huge-state Markov chains according to the direction of investigating the structure of Markov Graph to reduce complexity of computation. We focus on the way to access to the finite-state Markov chain theory via Graph theory.

8p tuanlocmuido 19-12-2012 43 3   Download