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Nov 26, 2021Open    AccessArticle

AUAG Machining Mechanism and Experimental Study of SiN Brittle Materials

Chunfang Xiao
In this paper, it is studied that the processing mechanism of SiN brittle material in Axial Ultrasound Vibration Assisted Grinding. Search for the relationship between machine tool system and ultrasonic system in AUAG machining, and establish the mathematical model of system matching. The importance of system matching for AUAG machining is verified by the influence of ultrasonic parameters on grinding force and workpiece surface quality. I verify the correctness of the theory. The matching model...
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1108143


Sep 30, 2021Open    AccessArticle

A Note on Surface Integrals of Vector Fields

Zhengyuan Wei, Xiaoya Zhou, Jinrong Jiang
Surface integrals of vector fields play an important role in the solutions of natural science and physical science. The Gauss theorem reduces the difficulty of directly computing surface integrals of vector fields. This paper introduces an approach for the computation of integral surfaces in vector fields and obtains a generalized mathematical expression based on Gauss theorem. Moreover, the computation time is investigated by two classical examples.
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1107934


Sep 30, 2021Open    AccessArticle

The Lagrangian Formulation and Gauge Theory of the Standard Model

Mohammed Ibrahim Abdelgabar, Abdulhamid Yakubu, Mubarak Dirar Abdallah
Study of gauge symmetry is carried over the different interacting and non-interacting field theoretical models through a prescription based on Lagrangian formulation. And the prescription is capable of testing whether a given model possesses a gauge symmetry or not. It can successfully formulate the gauge transformation generator in all the cases whatever subtleties are involved in it. It is found that the prescription has the ability to show a direction how to extend the phase space using auxil...
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1107875


Sep 23, 2021Open    AccessArticle

GGA + U Study of the Optical Properties of LiH

Uko Ofe, Anthony Lordson Amana, Nsed A. Akonjom
In this paper, the optical properties of Lithium hydride (LiH), in rocksalt structure, with space group, Fm3m, in cubic (FCC) system, have been discussed. The theoretical background of the relation between the dielectric function, and, other optical constants has been examined. The real and imaginary parts of the dielectric function have also been scrutinized. The consequences of the exchange correlation potentials (GGA and GGA U) applied to the absorption peaks and edges of the compound have ...
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1107376


Sep 23, 2021Open    AccessArticle

GGA + U Approximation: An Improved Density Functional Theory of Optical Properties of CaH2

Uko Ofe, Anthony Lordson Amana, Nsed A. Akonjom
In this paper, the optical properties of CaH2, in orthorhombic structure, with space group, , in crystal system (Co2Si-type) have been investigated carefully. The theoretical milieu of the correlation between the dielectric function with other optical constants has been investigated. The real and the imaginary parts of the dielectric function have besides, been inspected accurately. The outcome of the exchange correlation potentials implemented (GGA and GGA U) to the abso...
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1107293


Jun 09, 2021Open    AccessArticle

Heavy Metals Content in Cloves Spices (Syzygium aromaticum) Cultivated in Zanzibar

Fatma Omar Khamis, Suleiman Ameir Suleiman, Mohmmed Sheikh, Ahmada Omar Ali
The concentration of selected heavy metals (Chromium-Cr, Cadmium-Cd and Lead-Pb) collected from different sites of Unguja and Pemba were determined using Energy Dispersive X-Ray Fluorescence (EDXRF). The findings showed that Cr ranged from 10.3 to 16.25 ppm, Cd from 3.39 to 8.00 ppm and Pb from 0.35 to1.18 ppm for Pemba Island. For Unguja Island Cr ranged from (6.65 to 12.3 ppm, Cd ranged from (2.61 to 6.00) ppm and Pb ranged from (0.52 to 0.80 ppm). Significant elemental correlation (p ≥ 0.05) ...
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1107502


Feb 23, 2021Open    AccessArticle

First Correct Experimental Discovery of the “Weak” Gyrotropy-Phenomenon of “Non-Gyrotropic” Crystals of 3 m, 4 mm, 6 mm Symmetry Classes, Using the LiNbO3 Crystal as an Example

Alexander Kh. Zilbershtein
The purpose of the work was the correct experimental discovery of the effect of “weak” gyrotropy of the “non-gyrotropic” transparent crystals. The original experiment was based on the study of the light transmission (T) of the system: Polarizer—wedge-shaped Crystal’s sample—Analyzer (orthogonal to Polarizer). It was shown that: if the optical axis of the crystal is parallel to the rib of the wedge and to the polarization of the linear-polarized incident light, then the transmission T of the syst...
Open Access Library J. Vol.8, 2021
Doi:10.4236/oalib.1107194


Jul 14, 2020Open    AccessArticle

Mechanical, Dielectric and Shielding Performance of Rice Husk/Polycaprolactone Composites Enhanced via Rice Husk Particles Inclusion

Abubakar Yakubu, Zulkifly Abbas, Sirajo Abdullahi
Developing new absorbing and shielding materials with a large band of frequency and high performance to allow the coexistence of the electronic components without the damaging electromagnetic interference (EMI) is needed. For this reason, this work is focused on polycaprolactone (PCL) and rice husk particles (RHP) prepared at filler percentage of 0 to 60 wt% leading to the formation of PCL/RHP composites. The RHP was prepared by washing with water, acetone, sun-dried and grinded in a milling mac...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106514


Jun 12, 2020Open    AccessArticle

Numerical Modeling of the Radiative Transfer by the Fractional Step Method

Abdelhamid Belghit, Ibtissam Ouzzine
The main subject of this study is to adapt the fractional step method to the resolution of the radiative heat equation. This interest is justified by the intervention of the flow radiation in the modeling of several physical phenomena. Since this differential equation is actually difficult to solve, a new method has to be used to solve the equations that govern the heat transfer in the porous medium. The results have been limited to the less fine parametric study and have brought us to the concl...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106406


May 26, 2020Open    AccessArticle

Optimization of Process Parameters in Electro-Magnetic Welding of D9 Tube to SS316 L (N) Plug

Satendra Kumar, G. K. Dey, Archana Sharma
In electro-magnetic welding (EMW) process, optimization of process parameters is very important aspect. Optimization process leads to generation of mechanically and metallurgically sound interface weld without overstressing tool coil and electromagnetic welding equipment. This work investigates the effect of four important process parameters (Magnetic field in coil ID, Frequency of current pulse, Taper angle of SS316 L (N) plug and Stand-off distance between D9 tube and SS316 L (N) plug) on weld...
Open Access Library J. Vol.7, 2020
Doi:10.4236/oalib.1106346


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