Theoretical and Mathematical physics

Ebook "Advances in quantum chemistry: Applications of theoretical methods to atmospheric science (Volume 55)" presents surveys of current developments in this rapidly developing field that falls between the historically established areas of mathematics, physics, chemistry, and biology. With invited reviews written by leading international researchers, each presenting new results, it provides a single vehicle for following progress in this interdisciplinary area. Theoretical methods have dramatically extended the reach and grasp of atmospheric scientists.

488p coduathanh1122 27-03-2024 5 1   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 17 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 18 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 19 3   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 9 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 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 15 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 11 1   Download

The performance of a microwave absorbing material (MAM) is often characterized by a negative reflection loss (RL) which is due to the material’s strong absorption and weak reflection of electromagnetic radiation. An absolute absorption can theoretically be achieved in a MAM that has equal permittivity and permeability (er=ur) to satisfy the impedance matching condition Z=Z0 (Z and Z0 are the intrinsic impedance of the material and the impedance of incident medium, respectively).

10p tamynhan9 02-12-2020 8 0   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 16 1   Download

The theoretical results are applied to interstitial alloy AuSi. In the case when the concentration of interstitial atoms is equal to zero, we obtain the thermodynamic quantities of the main metal and the numerical results for alloy AuSi give the numerical results for Au.

10p tamynhan9 02-12-2020 9 2   Download

The obtained results allow us to determine the melting temperature of alloy ABC at zero pressure and under pressure. In limit cases, we obtain the melting theory of main metal A, substitutional alloy AB and interstitial alloy AC with FCC structure. The theoretical results are numerically applied for alloys AuCuSi and AgCuSi.

13p tamynhan9 02-12-2020 4 1   Download

The Helmholtz free energy, mean-square atomic displacements and Young’s modulus E are derived in closed analytic forms in terms of the power moments of the atomic displacements. Numerical calculations for Young’s modulus of W and Nb thin films are found to be in good and reasonable agreement with those of other theoretical results and experimental data.

11p tamynhan9 02-12-2020 17 2   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

The behavior of bioaerosol particles with various size and shape in the human respiratory tract was simulated by using a probabilistic model of the lung and an almost realistic mathematical approach to particle deposition. Results obtained from the theoretical computations clearly show that biogenic particle deposition in different lung compartments does not only depend on physical particle properties, but also on breathing mode (nose or mouth breathing) and inhalative flow rate (=tidal volume • breathing frequency/30).

10p kethamoi1 17-11-2019 14 0   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

This paper presents a theoretic and practical approach to confirm the dynamic errors induced by acceleration on CMMs during fast measuring. To simplify, a physical model, a mathematical model of the bridge component and the prismatic joint that move along X axis of a bridge CMM are presented.

9p sansan2 26-05-2018 22 1   Download