Quantum modeling of semiconductor gain materials and vertical-external-cavity surface-emitting laser systems

This article gives an,overview of the microscopic theory,theory used to quantitatively model a wide range of semiconductor laser gain materials. As a snapshot of the current state of research, applications to a variety of actual quantum-well systems are presented. Detailed theory experiment comparisons are shown and it is analyze how the theory can be used to extract poorly known material parameters. The intrinsic laser loss processes due to radiative and nonradiative Auger recombination are evaluated microscopically. The results are used for realistic simulations of vertical-external-cavity surface-emitting laser systems. To account for nonequilibrium effects, a simplified model is presented using pre-computed microscopic scattering and dephasing rates. Prominent deviations from quasi-equilibrium carrier distributions are obtained under strong in-well pumping conditions

Alternating quaternary algebra structures on irreducible representations of sl(2,C)

We determine the multiplicity of the irreducible representation V(n) of the simple Lie algebra sl(2,C) as a direct summand of its fourth exterior power $\Lambda^4 V(n)$. The multiplicity is 1 (resp. 2) if and only if n = 4, 6 (resp. n = 8, 10). For these n we determine the multilinear polynomial identities of degree $\le 7$ satisfied by the sl(2,C)-invariant alternating quaternary algebra structures obtained from the projections $\Lambda^4 V(n) \to V(n)$. We represent the polynomial identities as the nullspace of a large integer matrix and use computational linear algebra to find the canonical basis of the nullspace.Comment: 26 pages, 13 table

THE SMART CITY INFRASTRUCTURE DEVELOPMENT & MONITORING

The smart city infrastructure is the introductory step for establishing the overall smart city framework and architecture. Very few smart cities are recently established across the world. Some examples are: Dubai, Malta, Kochi (India), Singapore. The scope of these cities is mainly limited to construct a technology park converting the industrial real estate to state of the art information technology using the evolution in the telecom and IP networks including insignificant asset management automation system. The development background is to create an operational platform that would manage the power consumption and operational resources in order to reduce the overall running operational cost. This paper will debate the smart infrastructure development framework and the surveying positional accuracy of locating the assets as a base of the smart city development architecture integrated with all the facilities and systems related to the smart city framework. The paper will discuss also the main advantages of the proposed architecture including the quantifiable and non quantifiable benefits.Smart Infrastructure, GIS, Smart City, Geopsatial application, Infrastructure Development, Infrastructure Monitoring.

American College Students\u27 Perceptions of Saudi Arabia as a Travel Destination

Destination image is a critical factor for customers making a travel decision. The recent fluctuation in oil prices has forced the Government of Saudi Arabia to focus on tourism to revive its economy. The terrorist attacks in the United States on September 11, 2001, affected the image of Saudi Arabia in the minds of people in other countries. The purpose of this study is to investigate American college students’ perceptions of Saudi Arabia as a travel destination and to provide information to help Saudi Arabia’s tourism authority to develop marketing strategies that will attract potential tourists

DOES CITIZENSHIP MATTER? AN EMPIRICAL LOOK AT THE BIHARIS IN BANGLADESH

I argue in this paper that legal, but in effective citizenship does not matter much, only effective citizenship matters. Effective citizenship can award an individual the “right to have rights.” Ineffective citizens do not have the “right to have rights” or they do not have access to many important rights associated with citizenship rights. They suffer from ineffective governance, and the State of their citizenship discriminates against them. My empirical findings show that the Biharis in Bangladesh are de jure citizens, but de facto stateless persons. In the strict legal sense, they are citizens of Bangladesh, but practically they still do not have access to many significant rights attached to the citizenship right that is essential to make their citizenship meaningful or effective. This paper suggests that to make them effective citizens of Bangladesh, the Government should extend equal rights and responsibilities to the Biharis like other citizens. Their ability to access all rights and duties attached to citizenship rights would make them effective citizens of the country, and their citizenship could be meaningful.  Article visualizations