RLINKS: A MECHANISM FOR NAVIGATING TO RELATED FILES

This thesis introduces Relative links or rlinks, which are directed labeled links from one file to another in a file system. Rlinks provide a clean way to build and share related-file information without creating additional files and directories. Rlinks form overlay graphs between files of a file system, thus providing useful alternate views of the file system. This thesis implements rlinks for the Linux kernel and modifies the storage structure of the Ext2 file system to store the rlinks

Optical Characterization of Anodically Grown Silicon Dioxide Thin Films

In silicon-based fabrication processes, silicon dioxide (SiO2) thin film is most widely used insulating film in the manufacture of integrated/discrete devices and microelectro-mechanical systems (MEMS). Various techniques have been established for the synthesis of silicon dioxide thin films. However, anodic oxidation method offers key advantages over the high temperature processes such as low cost, simple experimental set-up, low temperature, etc. In the present work SiO2 thin films are developed on silicon using anodic oxidation technique at room temperature. Constant voltage mode is employed in order to investigate the effect of applied voltage and the electrolyte stirring on thickness, refractive index and chemical bonds of the as-grown oxide films. Spectroscopic ellipsometry and Fourier transform infrared spectroscopy (FTIR) are employed to characterize various properties of the as-grown oxide films. At the applied voltage of 250 V, the highest thickness of 134 nm is obtained. The oxides developed at higher voltages are slightly silicon rich. The present study is aimed to explore the applications of silicon anodic oxidation in MEMS/Microelectronics fabrication

Stiffness of Contacts Between Rough Surfaces

The effect of self-affine roughness on solid contact is examined with molecular dynamics and continuum calculations. The contact area and normal and lateral stiffnesses rise linearly with the applied load, and the load rises exponentially with decreasing separation between surfaces. Results for a wide range of roughnesses, system sizes and Poisson ratios can be collapsed using Persson's contact theory for continuous elastic media. The atomic scale response at the interface between solids has little affect on the area or normal stiffness, but can greatly reduce the lateral stiffness. The scaling of this effect with system size and roughness is discussed.Comment: 4 pages, 3 figure

Effect of electro-co-deposition parameters on surface mechanical properties of Cu-TiO2 composite coating

The present work describes processing and properties of Cu–TiO2 electrodeposited coating on copper substrate with optimized current density and ultrafine ceramic TiO2 powder in the plating bath. Direct current electrodeposition process was employed to develop the composite coating with Cu matrix and ceramic oxide (TiO2) nanoparticles as reinforcement on copper substrate. The coatings were developed with 0 (unreinforced), 10 and 30 g l −1 TiO2 powder in bath, at four different current densities (5, 8, 11 and 14 A dm −2 ) to study the effect of current density and particle concentration in bath on the structure and properties of the developed coatings. Phase, microstructure and compositional analysis of the coatings were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS), respectively. Hardness and wear resistance of the coatings were analysed by using microhardness tester and ball on plate wear tester and improvement in these properties was observed due to particle reinforcement and crystallographic texture

Surface Property Modification of Copper by Nanocomposite Coating

Copper has high electrical and thermal conductivities, good corrosion resistance at ambient temperature, excellent malleability/workability and reproducibility, apart from these it is cheap and abundantly available metal other than good conducting metals like Silver. But has poor mechanical properties such as hardness and wear resistance. Some applications like Contacts in electrical switches necessitate the improvements in the mechanical properties without much loss of electrical and thermal conductivities. Bulk modification / alloying have been tried but limitations in alloying and adversely decrease in its electrical and thermal conductivities has been reported. Another way to improve its mechanical properties is with Surface modification by developing composite coating on its surface. In the present work we employed Electrodeposition process to develop a composite coating with Cu matrix and Ceramic oxide particles TiO2 (particle size ~202 nm), Al2O3 (particle size ~287 nm) as reinforcements. The coatings were developed with 10 g/l, 30 g/l and 0 g/l (unreinforced) concentrations in bath, at four different current densities (5, 8, 11, 14 A/dm2) with using copper sulfate bath in order to study the effect of Current density and particle concentration in bath, on structure and properties of the coatings developed. The crystallite size was averagely 50-65 nm and a strong (220) texture was obtained in composite coatings and unreinforced Cu coatings determined from the XRD data. The composition and surface morphology of coatings were studied by using EDS and SEM. Hardness and Wear resistance of the coatings were determined by using microhardness tester and ball on plate wear tester, improved hardness and wear resistance of composite coatings were observed compared to the unreinforced copper coatings

Smart Inventory Management System

Smart Inventory Management System is an online software application which fulfills the requirement of a typical Stock Analysis in various godowns. It provides the interface to users in a graphical way to manage the daily transactions as well as historical data. Also provides the management reports like monthly inwards, monthly deliveries and monthly returns. This application maintains the centralized database so that any changes done at a location reflects immediately. This is an online tool so more than one user can login into system and use the tool simultaneously. The aim of this application is to reduce the manual effort needed to manage transactions and historical data used in various godowns. Also this application provides an interface to users to view the details like the daily Stock Statements of all godowns

DESIGN AND FE SIMULATION OF UNMANNED AERIAL VEHICLE PROPELLER

Quad copter also known as quadrotor is the next conventionality of helicopters having more dynamic stability than chopper. They play a predominant role in distinct areas preference surveillance, military operations, fire reason and some momentous areas possession many complexities. This fictitious focus on the aerodynamic effects of quadcopter. It harangues all the aspects of quadcopter sift from mechanical design to electronics used. It provides accompaniment to the selection of separate components with the help of various formulas from exploration papers. It also gives clear arise with respect to weight of components and their conformable expense. Along with this, limited constitute analysis is done on the adjust so as to sustain the loads conceive in the vehicle. In this statement the static analysis is to determine the deformation, significance and strain at separate materials (steel, aluminium allay 7075 and exhale firmness). Modal analysis is to determine the frequencies with respect to deformations at distinct gradation regulate. In this thesis the CFD analysis done by propeller blade is to regulate the Pressure, celerity, drag force and elevator violence at different Mach numbers (2, 4, 6 and 8) 3D model intriguing in CREO parametric software and analysis in ANSYS software

Interfacial separation between elastic solids with randomly rough surfaces: comparison between theory and numerical techniques

We study the distribution of interfacial separations P(u) at the contact region between two elastic solids with randomly rough surfaces. An analytical expression is derived for P(u) using Persson's theory of contact mechanics, and is compared to numerical solutions obtained using (a) a half-space method based on the Boussinesq equation, (b) a Green's function molecular dynamics technique and (c) smart-block classical molecular dynamics. Overall, we find good agreement between all the different approaches.Comment: 25 pages, 12 figure

DESIGN OPTIMISATION OF TWO WHEELER PISTON BY ALUMINUM ALLOYS

A piston is a component of correlate engines, return plimsoll, gas compressors and pneumatic cylinders, among other similar mechanisms. It is the moving compositional that is enclose by a cylinder and is made gasoline-handy by piston tingle. The piston metamorphoses the energy of the expanding wind into mechanical efficiency. The piston bucket in the fly liner or sleeve Pistons are generally made of Al or cast hard alloys. The main aim of the project is to sketch a piston for 1300cc diesel engine for two materials Cast Iron and Aluminium Alloy. The deigns of the piston are sculptured using PRO-E software. The purpose is evaluated by structural and thermal column analysis by address pressures and temperatures respectively. The rise is evaluated by checking the force, displacement, thermal gradient and warm purge to decide the prime mean of the piston. Structural and Thermal analysis are done in ANSYS software

EIRFLAT-1: A FlatSat platform for the development and testing of the 2U CubeSat EIRSAT-1

The Educational Irish Research Satellite (EIRSAT-1) is a 2U CubeSat being designed, built and tested at University College Dublin. A FlatSat platform known as EIRFLAT-1 has been constructed to enable the testing and development of the CubeSat. EIRFLAT-1 facilitates the electrical connections between CubeSat components while leaving key interfaces accessible for test equipment and allowing for the hot swapping of components. Commercial Off The Shelf and in-house developed hardware has been tested using EIRFLAT-1 at component, subsystem and full system level. In addition, the FlatSat has been used for flight software development. This paper describes the design of EIRFLAT-1 including electrical and mechanical components and additional ground support equipment developed to assist in the testing and development activities. EIRFLAT-1 has proven to be an invaluable tool for testing and has led to the discovery of issues and unexpected behaviour with flight hardware which would have contributed to schedule delays if undiscovered until after the satellite was assembled. Moreover, EIRFLAT-1 facilitated early and incremental testing of both software and operations procedures. The schematics for the electrical design of EIRFLAT-1, which is compatible with all CubeSat Kit PC/104 components, has been made publicly available for use by other educational CubeSat team