Fundamental physics concepts

Tribological behavior of double-glow plasma Zirconium-Yttrium alloying on γ-TiAl Cong Huang, Pingze Zhang*, Dongbo Wei, Xiangfei Wei, Xiaohu Chen and Feng Ding (College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China) * Corresponding author: pzzhang_nuaa@126.com Abstract: A Zr-Y alloyed layer was prepared onto the surface of γ-TiAl using double-glow plasma surface alloying technique (DG technique). The results showed that the Zr-Y…

The capabilities of a hysteresis motor can be judged based upon an evaluation of its behavior under two specific operating conditions: 1) starting conditions, and 2) steady state synchronous operating conditions at maximum torque. It is easier to conduct an experimental study on the behavior of a hysteresis motor under starting conditions than the second operating conditions. Furthermore, the starting behavior of hysteresis motors is of great importance from two perspectives: 1) usually the…

The optimized structures of the Ti 3 (Si x Al 1−x )C 2 are shown in Fig. 3, as are visualized by the VESTA, in the form of hexagonal, nano-layered structures. The resultant lattice parameters of the Ti 3 (Si x Al 1−x )C 2 are shown in Fig. 4, and compared to experimental results. As it can be in Fig. 4, both of the calculated and experimented results show that the c lattice parameter decreases more than the a lattice parameter with increasing amount of Si. Fig. 5 is a 2-dimensional…

Energy can be potential or kinetic. Radiant energy is a form of Kinetic energy. Movement of atoms, molecules, objects, waves, substances referring to a Kinetic energy. There are many different forms of kinetic energies like sound, motion, thermal energy, electrical energy. Nevertheless, there would be no life on Earth without radiant energy. What is radiant energy? The energy of electromagnetic waves and gravitational radiation is radiant energy. Radiant energy is the result of a change in…

Theory: Boyle’s Law states that when temperature (T) is kept constant, pressure (P) and volume (V) have an inversely proportional relationship. Boyle’s constant (B) can be expressed by V=B/Pwhere volume is (in this lab) cm^3 and pressure is in atm. Charles’ Law states that when pressure is held constant, temperature and volume are directly proportional. Charles’ constant (C ) can be expressed by V=CTwhere volume is in cm^3 and temperature is in Kelvin. Gay-Lussac’s Law states that when…

Thermal effect results from the change in the heat capacity of the gases in the combustion chamber. It is worth mentioning that EGR contains water and CO2 which have higher specific heat capacity than air. The change in absorbing heat is proportional to the added mass, to the heat capacity at constant pressure and to the difference in temperature between the EGR and the combustion temperature. ΔQ=Δm*Cp*(Tcom-Tegr) The change in specific heat capacity results from charge dilution and represents…

Answer: Question 1 (a) Energy Energy Energy Band gap Band gap 0 0 0 (i) Insulator (ii) Semiconductor (iii) Conductor Diagram 1: The energy band The differences between insulator, semiconductor and conductor. Insulator Semiconductor Conductor It has a large band…

COMPARATIVE STUDY ON FRICTION WELDED AND ELECTRON BEAM WELDED JOINTS MADE BY 20VNiMoCr120 STEEL Gabriela IANCULESCU*, Lucia Violeta MELNIC, Marian Andrei GURĂU Ovidius University of Constanta Abstract: In the paper there are presented experimental results concerning mechanical characteristics of friction-welded joints in comparison with electron beam welded joints, made by 20VNiMoCr120 heat-resistant steel, which are part of some elements working at high pressure and temperature. The paper…

The Quantum-Mechanical Model of the Atom Introduction: The theory of quantum mechanics explains the behavior of the particles, such as photons (particles of light) and electrons, in the atomic and subatomic realms. Since the electrons of an atom determine many of its chemical and physical properties, quantum mechanics is foundational to understanding chemistry. Quantum-Mechanical Model- a model that explains the strange behavior of electrons Electromagnetic Radiation- a type of energy…

1. OBJECTIVES The objectives of the experiment are: • Measurement of creep deformation in 2 materials; lead and polypropylene at room temperature. • Determine how creep deformation of chosen materials can be affected by stress. • Recognise that the two classes of materials show differences in creep behaviour. • Awareness of creep as a design consideration. 2. THEORY 2.1 Introduction Structural materials are often placed in service under a certain applied load at elevated temperatures (eg. wind…