The macroscopic entropy-area formula for supersymmetric black holes in N=2,4,8 theories is found to be universal: in d=4 it is always given by the square of the largest of the central charges extremized in the moduli space. The ...
In this study, two highly accurate and simple analytical methods (known as semi exact solutions), the variational iteration method (VIM) and Adomian's decomposition method (ADM) are applied for illustrating transient condition of viscous... more
In this study, two highly accurate and simple analytical methods (known as semi exact solutions), the variational iteration method (VIM) and Adomian's decomposition method (ADM) are applied for illustrating transient condition of viscous fluid flow over oscillating plane and also oscillating viscous fluid flow over stationary plane. The flow of an incompressible viscous fluid, caused by the oscillation of a flat wall and also the flow of an oscillating fluid flow over stationary wall are considered by Navier-Stokes equations and are subjected to the behavior of fluid flow in boundary layer at transient condition. The main purpose of this article is to solve transient Navier-Stokes first and second equations in new mathematical solving method which is called semi exact solutions where in each case, the velocity of viscous fluid is determined as a function of time and also vertical distance from plane in boundary layer at transient condition. Results reveal the boundary layer thickness and also the transient fluid flow velocity in boundary layer and even more it shows that the (VIM) and (ADM) methods are very effective and accurate in comparison with the exact solution results. The results demonstrate the velocity of fluid in boundary layer as a function of displacement and time and it is shown that in different time, the value of velocity obtained by "VIM" and "ADM" solving methods is almost equal to velocity which is derived from exact or numerical solutions. So the main background and reason of applying the mentioned methods is to verify the accuracy of "VIM" and "ADM" in solving different fluid mechanics equations especially Navier-Stokes equations.
PT. Laundry XYZ is a company engaged in laundry services. The services offered consist of leasing and washing all types of linen. In carrying out the company's operational activities, PT. Laundry XYZ has not utilized the application of... more
PT. Laundry XYZ is a company engaged in laundry services. The services offered consist of leasing and washing all types of linen. In carrying out the company's operational activities, PT. Laundry XYZ has not utilized the application of information system/information technology as a whole. Data management is still manual so that it has many risks, including errors in recording or inputting data, the time needed is relatively longer to access and process information, and the risk will affect the delay in information provided to customers and management of PT. Laundry XYZ. Some other problems are the absence of application that support the company's operational activities so that linen loss often occurs, linen delivery is not on time, and difficulties in monitoring stock of linen. Based on the above problems, PT. Laundry XYZ requires enterprise architecture planning in accordance with the company's vision and mission. Enterprise architecture planning in this study uses version 9 of the TOGAF (The Open Group Architecture Framework) framework with the ADM (Architecture Development Method) method. This architectural planning produces the target blueprint of business architecture, data architecture, application architecture, and technology architecture that can be used as a guide in the procurement of information system/information technology at PT. Laundry XYZ.
