Tingkat Partisipasi Anggota pada Koperasi Unit Desa (Kud) Kusuma Bakti Desa Sialang Kubang Kecamatan Perhentian Raja Kabupaten Kampar

This study aims to; (1) to analyze the level of participation of members of the Koperasi Unit Desa (KUD) Kusuma Bakti; (2) Knowing the obstacles encountered in increasing the participation of members of the board. Research conducted at Koperasi Unit Desa (KUD) Kusuma Bakti the Village Sialang Kubang Subdistrict Perhentian Raja Kampar Regency. The study conducted by using method of survey, the method of sampling was done by Simple Random Sampling, and the samples taken 33 people of the total population. The collecting data of this research was using primay data and secondary data. To analyzed the degree and the problem at participation of this research was using descriptive method. To obtain the degree of participation of members in contributing or mobilize its resources, member participation in decision making, and participation of members in enjoying benefits. Data were analyzed with the participation level Likert's Summated Rating Scale. The study concluded that the overall level of participation of members of KUD Kusuma Bakti get a total score of 2.25 (1.67 to 2.33 are included in the category of medium participation rates). In another side, the programs KUD Kusuma Bakti had some problem that related by the degree of participant were passive in cooperative activities, attendance gave ideas on meeting, and participant in activity and evaluation of programs village cooperatives Kusuma Bakti

A Unified CFD Based Approach to a Variety of Condensation Processes in a Viscous Turbulent Wet Steam Flow

A family of quasi linear mathematical models is presented and calculations made for viscous turbulent wet steam flow with a variety of condensation phenomena. These models can be applied to the analysis of equilibrium condensation, homogeneous (spontaneous) condensation, heterogeneous condensation on extraneous particles, and condensation of charged dispersed phase moving in an electrostatic field. The unified model is represented by coupled systems of gas dynamic equations for viscous turbulent two-phase flow, kinetic and electro-kinetic equations tracing out combined processes of size and charge growth, and electromagnetic field equations described an electric field with an account of self- induced in-part by a moving electrical cluster. The numerical procedure is time marching, monotone, implicit, of second order accuracy by space and time coordinates, and exhibits high resolution shock capturing ability. Viscous flow field calculations made with this procedure reveal significant influence on condensation by the shear boundary layers and wakes. Distributions of cooling rate, droplet radius and parameters of the bulk flow are predicted. Verification of the codes against known experimental data is presented

Variational Approach of Constructing Reduced Fluid-Structure Interaction Models in Bifurcated Networks

Reduced fluid-structure interaction models have received a considerable attention in recent years being the key component of hemodynamic modeling. A variety of models applying to specific physiological components such as arterial, venous and cerebrospinal fluid (CSF) circulatory systems have been developed based on different approaches. The purpose of this paper is to apply the general approach based on Hamilton’s variational principle to create a model for a viscous Newtonian fluid - structure interaction (FSI) in a compliant bifurcated network. This approach provides the background for a correct formulation of reduced FSI models with an account for arbitrary nonlinear visco-elastic properties of compliant boundaries. The correct boundary conditions are specified at junctions, including matching points in a combined 3D/1D approach. The hyperbolic properties of derived mathematical model are analyzed and used, constructing the monotone finite volume numerical scheme, second-order accuracy in time and space. The computational algorithm is validated by comparison of numerical solutions with the exact manufactured solutions for an isolated compliant segment and a bifurcated structure. The accuracy of applied TVD (total variation diminishing) and Lax-Wendroff methods are analyzed by comparison of numerical results to the available analytical smooth and discontinuous solutions

Application of Variational Principle to Form Reduced Fluid-Structure Interaction Models in Bifurcated Networks

Reduced fluid-structure interaction models have received a considerable attention in recent years being the key component of hemodynamic modeling. A variety of models applying to specific physiological components such as arterial, venous and cerebrospinal fluid (CSF) circulatory systems have been developed based on different approaches. The purpose of this paper is to apply the general approach based on Hamilton’s variational principle to create a model for a viscous Newtonian Fluid - Structure Interaction (FSI) in a compliant bifurcated network. This approach provides the background for a correct formulation of reduced FSI models with an account for arbitrary nonlinear visco-elastic properties of compliant boundaries. The correct boundary conditions are specified at junctions, including the interface between 3D and 1D models. The hyperbolic properties of the derived mathematical model are analyzed and used, constructing a monotone finite volume numerical scheme, second-order accuracy in time and space. The computational algorithm is validated by comparison of numerical solutions with the exact manufactured solutions for an isolated compliant segment and a bifurcated structure. The accuracy of applied total variation diminishing (TVD) and Lax-Wendroff schemes are analyzed by comparison of numerical results to the available analytical smooth and discontinuous solutions, demonstrating a superior performance from the TVD algorithm

Quantification of Hemodynamic Pulse Wave Velocity Based on a Thick Wall Multi-Layer Model for Blood Vessels

Pulse wave velocity (PWV) is an important index of arterial hemodynamics, which lays the foundation for continuous, noninvasive blood pressure automated monitoring. The goal of this paper is to examine the accuracy of PWV prediction based on a traditional homogeneous structural model for thin-walled arterial segments. In reality arteries are described as composite heterogeneous hyperelastic structures, where the thickness dimension cannot be considered small compared to the cross section size. In this paper we present a hemodynamic fluid - structure interaction model accounting for the variation of geometry and material properties in a radial direction. The model is suitable to account for the highly nonlinear orthotropic material undergoing finite deformation for each layer. Numerical analysis of single and two layer arterial segments shows that a single thick layer model provides sufficient accuracy to predict PWV. The dependence of PWV on pressure for three vessels of different thicknesses is compared against a traditional thin wall model of a membrane shell interacting with an incompressible fluid. The presented thick wall model provides greater accuracy in the prediction of PWV, and will be important for blood pressure estimation based on PWV measurements

Genetic algorithms and their application for business decisions

Genetic Algorithms, a more recently developed technique for optimization, have shown strong promise for solving complex optimization problems in a timely fashion. Most of the applications have been under taken using programming languages like C, C++, Lisp, and even FORTRAN, which require significant programming skills to master and implement. With the advent of new Genetic Algorithm (GA) Excel add- in features, GAs are available to the basic business analyst often armed with only a spreadsheet. This thesis will focus on investigating the applicability of GAs on various business problems, such as, the Traveling Salesman Problem (TSP), scheduling, curve-fitting for forecasting, or portfolio optimization, using only a spreadsheet. My thesis will investigate the potential utility and limitations of GAs in solving typical business problems with the limited programming environment of a spreadsheet. I will explore the features of a GA and emphasize other possible applications, focusing on the utility of the GA technique rather than the technique itself. This will be done using only a spreadsheet, in order to limit the actual technical requirements to encode the problem and solution algorithms.California State University, Northridge. Department of Business.Includes bibliographical references (leaves 43-44

BTGNX: Windkanalexperiment zu kopfspaltströmungsinduzierter Geräuschentstehung - Teil 2: Experimentelle Untersuchung

Anknüpfend an die auf der DAGA 2023 vorgestellten Grundzüge des Braunschweig Tip-Gap-Noise eXperiment (BTGNX), werden in diesem Konferenzbeitrag die durchgeführte experimentelle Untersuchung, der dabei genutzte Versuchsaufbau, die eingesetzten Messtechniken und erste Ergebnisse präsentiert. Die begleitend dazu erfolgten numerischen Arbeiten werden in Teil 1: Numerische Ergebnisse dargelegt. Das Ziel des BTGNX ist eine aeroakustische Untersuchung der Strömung im Spalt zwischen der Seitenkante eines Flügels und einer ebenen Platte, wie sie sich zum Beispiel bei einem Ventilator zwischen Rotorblatt und Gehäuse ausbildet. In dem Kooperationsprojekt mit dem Ventilatorhersteller ebm-papst Mulfingen werden dazu sowohl numerische Arbeiten durchgeführt, als auch ein Windkanalexperiment, das eine breite akustische Datenbasis zur Validierung der Simulationen bereitstellen soll