Atomic physics

Lecture Physics A2: Nuclear physics - PhD. Pham Tan Thi present the content fundamentals of atom and nuclei, nuclides and isotopes, magnetic moments, NMR and magnetic resonance imaging, stable nuclei and unstable nuclei,...

24p xusong 21-07-2021 31 3   Download

Lecture Physics A2: Atomic physics - PhD. Pham Tan Thi present the content history of atomic model, quantum mechanical atomic theory, Schrödinger Equation in three dimensions, particle in a three-dimensional box, energy degeneracy,...

39p xusong 21-07-2021 31 2   Download

Aim of the thesis: Development of a new method for determining concentration of the radionuclides in enviromental samples by mean of gamma spectroscopy. Establishing a data set of the soil-plant transfer factor (TF) of radionuclides 238U, 232Th and 40K for some vegetables in Truong Sa island and that of 238U, 232Th, 40K and 137Cs for tea tree from Luong My farm, Hoa Binh province, Vietnam and evaluate the influence of natural radionuclide concentration to the soil-plant transfer process of artificial radionuclide 137Cs.

30p extraenglish 24-05-2021 23 3   Download

Research purpose: to build an analytical model describing the dependence of the optical properties (absorption, dispersion, group velocity and group delay) of the three configuration energy level system Λ, Ξ and V according to the following parameters: control parameters (intensity, frequency, polarization and relative phase) of the laser fields.

25p prisonbreak123 21-05-2021 17 3   Download

Purpose: Proposing an optical switches model that integrates both optical-magnetic switches and all optical switching in a degenerated two-levels atomic medium; Proposing a model to control the ultraslow group velocity of light soliton and dark soliton in a degenerated two-levels atomic medium.

27p prisonbreak123 21-05-2021 17 4   Download

This thesis investigates the properties of the protoplanetary disk surrounding a triple low-mass stellar system, GG Tau A, using interferometric observations of trace molecules such as 12CO, 13CO, C18O, DCO+, HCO+ and H2S, and of multi-wavelength dust emission.

17p capheviahe27 23-02-2021 10 2   Download

In this thesis, the author focussed on providing an application framework to be used in brain segmentation - the process of tumor detection. This constitutes setting up software bundled into a Window machine which is easily distributable. Moreover, a segmentation algorithm was implemented and tested using the provided software. In order to test the bundled software by implementing specific brain segmentation from the literature, the author used CT scans freely available from the database of 108 Central Military Hospital.

85p capheviahe27 23-02-2021 14 2   Download

The objectives of the thesis is: Determination of the concentration of the Naturally Occurring Radioactive Materials (NORM) in some building materials commonly used in Lao PDR such as cement, sand, etc. by gamma spectrometers using NaI(Tl) and HPGe detectors.

27p larachdumlanat129 20-01-2021 50 3   Download

In this research, the structural and electronic properties of N-doped anatase TiO2 layers were evaluated using the density functional theory (DFT). The results show that doping positions of N atoms cause different effects on the size and shape of unit cells of models.

7p tamynhan8 04-11-2020 17 3   Download

This paper studies the structure of the Mullite system (3Al2O3.2SiO2) by Molecular Dynamics simulation (MDs) using the Born–Mayer–Huggins pair interaction and periodic boundary conditions. The simulation was performed with model of 5250 atoms at different pressure and at 3500 K temperature.

7p tamynhan6 14-09-2020 17 2   Download

We have investigated the thermodynamic properties of the cubic zirconia ZrO2 using the statistical moment method in the statistical physics. The free energy, thermal lattice expansion coefficient, specific heats at the constant volume and those at the constant pressure, CV and CP , are derived in closed analytic forms in terms of the power moments of the atomic displacements.

16p 12120609 01-06-2020 9 1   Download

Objectives of the study: Focusing on studying how to incorporate of Fe and Cu atoms into GO and SBA-15 frameworks by atomic implantation method to create new, advanced and highly efficient nanocomposite catalysts for DDT treatment.

26p xacxuoc4321 08-07-2019 48 6   Download

2D nanomaterials such as graphene and transition metal dichal  cogenides (TMDCS) have shown outstanding potential in many fields such as fl exible electronics, sensing and optics due to their desirable physical and structural properties. High quality black phosphorus atomic layers by liquid phase exfoliation include Experimental Section; Supporting Information and Acknowledgements.

6p dangthaitrieu 11-05-2015 34 3   Download

A new procedure for calculation and analysis of XAFS (X-ray Absorption Fine Structure) cumulants of hcp crystals containing dopant atom has been derived based on quantum statistical theory with generalized anharmonic correlated Einstein model. Analytical expressions for effective local force constants, correlated Einstein frequency and temperature, first cumulant or net thermal expansion, second cumulant or Debye Waller factor and third cumulant of hcp crystals containing dopant atom have been derived.

7p tuanlocmuido 19-12-2012 37 3   Download

– PHYSICAL SCIENCE – Each kind of atom or molecule can gain or lose energy only in particular discrete amounts. When an atom gains energy, light at the wavelength associated with that energy is absorbed. When an atom loses energy, light at the wavelength associated with that energy is emitted. These wavelengths can be used to identify elements. Nuclear Reactions Key Concepts This chapter gave you a crash course in the basics of physical science. Here are the most important concepts to remember: ➧ All matter is composed of tiny particles ➧ ➧ ➧ ➧ ➧ ➧ called atoms.

48p tengteng17 03-01-2012 39 4   Download

• Imagine an atom with excess energy. Without external action, the atom would, after a period of time, spontaneously emit light, whose properties (e.g. its direction) are random — only the energy is fixed. • This situation changes when the atom is shone with a light wave of the corresponding energy. There is then a higher probability that the atom will also simply copy the remaining properties of the incident wave: It then emits light that is in step with the original and propagates in the same direction....

17p thanhan 22-07-2009 121 13   Download

To have a quantum-mechanical treatment we model a crystalline solid as matter in which the atoms have long-range order, that is a recurring (periodical) pattern of atomic positions that extends over many atoms. We will describe the wavefunctions and energy levels of electrons in such periodical atomic structures.  We want to answer the question: Why do some solids conduct curr We want to answer the question: Why do some solids conduct current ent and others don and others don’ ’t? t?...

21p thanhan 22-07-2009 151 18   Download

It is well known for you that every atom contains as its center a nucleus that is: positively charged much smaller in size than the atom carrying almost the total mass of the atom This chapter provides deeper knowledge about NUCLEI

22p thanhan 22-07-2009 108 9   Download

Rutherford (also Geiger-Marsden) Experiment (1911): Measured angular dependence of   particles (He ions) scattered from gold foil. The results: • Mostly scattering at small angles. But… • Occasional scatterings at large angles (even 90o)  Something massive in there ! Conclusion: Most of atomic mass is concentrated in a small region of the atom Recall some history:

35p thanhan 22-07-2009 107 15   Download

Many physical phenomena of great practical interest to engineers chemists, biologists, physicists, etc. were not in Gen. Phys. I & II Quantum Physics: The development of experimental equiment and techniques  modern physics can go inside the microscopic world (atoms, electrons, nucleus, etc.)  New principles, new laws for the microscopic (subatomic) world were discoverved

28p thanhan 22-07-2009 242 50   Download