Sameen Ahmed Khan
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View article: NUMBER THEORETIC TECHNIQUES IN THE SETS OF EQUAL RESISTOR NETWORKS
NUMBER THEORETIC TECHNIQUES IN THE SETS OF EQUAL RESISTOR NETWORKS Open
A variety of sets of equivalent resistances can be constructed by combining equal resistors in different configurations using series, parallel or bridge connections. The orders of such sets are traditionally obtained manually for small num…
View article: A new matrix representation of the Maxwell equations based on the Riemann–Silberstein–Weber vector for a linear inhomogeneous medium
A new matrix representation of the Maxwell equations based on the Riemann–Silberstein–Weber vector for a linear inhomogeneous medium Open
We derive a new eight dimensional matrix representation of the Maxwell equations for a linear homogeneous medium and extend it to the case of a linear inhomogneous medium. This derivation starts ab initio with the Maxwell equations and use…
View article: The African Light Source: history, context and future
The African Light Source: history, context and future Open
The African Light Source (AfLS) project is now almost eight years old. This article assesses the history, current context and future of the project. There is by now considerable momentum in building the user community, including deep train…
View article: Anisotropic Airy beams
Anisotropic Airy beams Open
Anisotropic Airy beams are presented as solutions to the parabolic wave equation. We obtain the cross polarization terms in the new beams using the elegant Mukunda–Simon–Sudarshan matrix substitution rule for transition from Helmholtz scal…
View article: A matrix differential operator for passage from scalar to vector wave optics
A matrix differential operator for passage from scalar to vector wave optics Open
One possible way to generalize scalar to wave optics, thus including polarization in the treatment consistent with the Maxwell equations was shown by Mukunda, Simon and Sudarshan (MSS) for paraxial systems, based on a group theoretical ana…
View article: A new matrix representation of the Maxwell equations based on the Riemann-Silberstein-Weber vector for a linear inhomogeneous medium
A new matrix representation of the Maxwell equations based on the Riemann-Silberstein-Weber vector for a linear inhomogeneous medium Open
We derive a new eight dimensional matrix representation of the Maxwell equations for a linear homogeneous medium and extend it to the case of a linear inhomogneous medium. This derivation starts ab initio with the Maxwell equations and use…
View article: Recycling of the Greywater from Mosques in Oman
Recycling of the Greywater from Mosques in Oman Open
Oman is located within Arid and Semi-Arid regions, where water resources are very scarce. The national average rainfall is just 80-100 mm per year. With high temperatures (30 ºC to above 40 ºC) the evaporation is also high. Therefore, it…
View article: THE FUTURE OF THE RENEWABLE ENERGY IN OMAN: CASE STUDY OF SALALAH CITY
THE FUTURE OF THE RENEWABLE ENERGY IN OMAN: CASE STUDY OF SALALAH CITY Open
The world-wide energy demand is continuously increasing compounded with global warming. There is an ever-increasing demand in energy accompanied with depletion of fuel stocks, particularly the fossil fuels. The current energy consumption r…
View article: Trigonometric Ratios Using Algebraic Methods
Trigonometric Ratios Using Algebraic Methods Open
The main aim of this article is to start with an expository introduction to the trigonometric ratios and then proceed to the latest results in the field.H istorically, the exact ratios were obtained using geometric constructions.The geomet…
View article: The Future of the Renewable Energy in Oman: Case Study of Salalah City
The Future of the Renewable Energy in Oman: Case Study of Salalah City Open
The world-wide energy demand is continuously increasing compounded with global warming. There is an ever-increasing demand in energy accompanied with depletion of fuel stocks, particularly the fossil fuels. The current energy consumption r…
View article: Driving Digital Competency Model Towards IR 4.0 In Malaysia
Driving Digital Competency Model Towards IR 4.0 In Malaysia Open
Today, fourth industrial revolution is causing tremendous uncertainty. These developments transform the way we live, and the way we work. The work environment change the job profiles and therefore requires employees with a wide range of co…
View article: SUMS OF THE POWERS OF RECIPROCALS OF POLYGONAL NUMBERS
SUMS OF THE POWERS OF RECIPROCALS OF POLYGONAL NUMBERS Open
We address the question of expressing the sums of the powers of polygonal numbers in closed forms using some basic functions.We obtain explicit expressions for the closed form expressions for the sums of the squares of reciprocals of polyg…
View article: 2019 Subrahmanyan Chandrasekhar Prize of Plasma Physics
2019 Subrahmanyan Chandrasekhar Prize of Plasma Physics Open
The Division of Plasma Physics (DPP) under the Association of Asia-Pacific Physical Societies (AAPPS) has selected Liu Chen (China) and Kazunari Shibata (Japan) as the 2019 Laureates of the Subrahmanyan Chandrasekhar Prize of Plasma Physic…
View article: Quantum mechanical techniques in light optics
Quantum mechanical techniques in light optics Open
In the traditional prescriptions, the Fermat's principle of least time or/and the Helmholtz equation are used to derive the beam-optical Hamiltonian. Now, we know that the Maxwell's electromagnetism gives rise to the correct theory of ligh…
View article: A Statistical Approach to Prime Gaps and Andrica's Conjecture
A Statistical Approach to Prime Gaps and Andrica's Conjecture Open
We examine the prime gaps using a statistical approach. It is first shown that the Andrica's conjecture is true for half or more cases. Using the arguments of averages, it is further shown that Andrica's conjecture is true. We further obta…
View article: Beginning to Count the Number of Equivalent Resistances
Beginning to Count the Number of Equivalent Resistances Open
Given a bunch of equal resistors, what are all the values of the equivalent resistances which one can obtain? Is there a formula? In this note, we address such questions analytically and establish strict lower and upper bounds of the cardi…
View article: Doing Numerical Calculus using Microsoft EXCEL
Doing Numerical Calculus using Microsoft EXCEL Open
Objectives: Numerical calculus can be done using calculators, readymade packages or programming languages. The spreadsheets are a middle course between the programming languages and the readymade packages. Methods/Statistical Analysis: Spr…
View article: The International Year of Light and Light-based Technologies
The International Year of Light and Light-based Technologies Open
Numerous conferences have been held on themes related to the Islamic goldenage of science during the mid-eighth to thirteenth centuries. But the event reportedhere is the “event of events,” so to say. The United Nations declared2015 the In…