This paper describes an investigation into the fabrication of absorber layer CuInSe2 films by co-evaporation process. And we used the stainless steel substrates to manufacture Al / ZnO:Al / ZnO /CdS / CuInSe2 / Mo / SLGTF / Stainless Steel(SS) flexible thin-film solar cell. The flexible solar cells were fabricated using soda-lime glass thin layers (SLGTL) as a diffusion barrier layer and an alkali source material deposited on various flexible substrates prior to the Mo backcontact layer deposition. Mo back contact layers were deposited by DC sputtering. The CIS absorber layers were grown by the two-stage process using a molecular beam epitaxy (MBE) apparatus. Then the CdS buffer layer was deposited by the chemical bath, RF sputter deposition of intrinsic ZnO and ZnO:Al (AZO) layer. Under the same process condition, using SLGTF as diffusion barrier layer improved open circuit voltage (Voc) 16.7% and short circuit current density (Jsc) 9.8%.

Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 156-162). Available also in a digital version from Dissertation Abstracts.

Flat electronic displays are ubiquitous in our environment from small handheld devices to large HDTVs. This report documents the design and development of a flexible electronic display system for low cost embedded applications. The main use of such a device would be in functions where flat displays are too rigid and too brittle to operate, like the emerging wearable electronics sector. A 10cm x 15cm, 224 pixel LED mesh display system is presented as a solution. A complete software stack was created in conjunction with the hardware. On the software side, a Visual Basic application allows users to easily generate image content for the display, five different global motion algorithms permit real time image manipulation, and an AVR assembly procedure handles screen refreshing. Altogether the system weighs 176 grams, can function under normal operating conditions for eight hours before recharging is required, and costs under $85 without volume discounts. / text

In this project the deformation behaviour of a rolled asphalt mixture is investigated, and the influence of temperature on the deformation mechanism of the mixture is assessed, based on a series of uniaxial creep and creep recovery experiments conducted under compressive stress and controlled temperature. Firstly, the experiments were conducted for various temperature levels, loading time, and number of load applications. It is found that the total strain consists of the elastic, plastic, viscoelastic and viscoplastic strain components. The temperature and number of load cycles hardly affects the elastic strain, but the plastic increases with temperature and decreases with number of load applications at constant stress levels. The timedependent (viscoelastic and viscoplastic) and the instant (elastic and plastic) deformation reduced respectively to viscoelastic and elastic deformation components at low temperature. Secondly the relationship between the total strain and the variables, time, temperature, stress and number of cycles are successfully modelled mathematically. After this, the model is introduced into the finite element method. Also an approximate approach for permanent deformation in a flexible pavement is presented and a non-linear finite element program "CEPVP" with consideration of the pavement temperature profile was devised. The calculation was conducted using program `CVEVP". It was found that there was a great agreement between the computation and the test. Finally, a general comparison of program 'CVEVP' and package ANSYS was conducted. Considering the effects of mechanical parameters of bituminous materials, time of loading, thickness of asphalt and granular layers and environmental temperature, calculation of permanent deformation of bituminous pavement was carried out using program `CVEVP'. Some findings were concluded. For example, it was found that the plastic properties of asphalt mixture are the important factor in calculating the permanent deformation of flexible pavements, particularly at the upper end of the temperature spectrum.

M. Tech. Electrical Engineering. / The main focus of this dissertation is to present the modelling and simulation of the Centurion suburb of the Tshwane Municipality electric power system using MATLAB/SIMULINK package. The basic system is tested under large and small disturbances to study the dynamic behaviour of the system and the stability margins associated with the different configurations of the system.

No description available.

A novel method of flexible-rotor vibration control, using an active contactless angular electromagnetic actuator is presented. A theoretical comparison of radial and angular damping is performed. Three different performance indices are defined and used to determine controller optimum damping/location data for different shaft systems. The controller settings are determined for two main cases: i) such that only one damping value is allowed throughout the entire shaft speed range (passive or fixed-gain active control), ii) the damping value is controlled as a function of rotor speed (adaptive control). The parameter optimisation, made possible by the creation of a simple but efficient numerical technique employed in conjunction with the transfer matrix method, is restricted to considering a speed range covering the first three rigid-bearing critical speeds for a uniform shaft supported by a variety of bearings. However, the approach is sufficiently general to allow the study of any required speed range. It is shown that for both the radial and angular dampers when mounted at the bearings, there is a definite support stiffness value above which the angular damper is the more efficient, but below which the opposite is true. When the conditions for 'fixed-points' are satisfied, then a simple on-off control strategy can be used effectively employing either type of controller. Angular damping is shown also to be an effective means of suppressing 'oil-whirl' type instability. The theoretical work is supported by experimental investigations on a laboratory rig which is representative of a general flexible rotor system. An electromagnetic controller is mounted at one bearing and the reduction of shaft unbalance response and bearing forces recorded for various conditions. Significant reductions in system synchronous response are observed at running speeds close to the first critical speed when electromagnetic stiffness and/or damping is employed. When electromagnetic damping is introduced, non-synchronous vibration components, resulting from shaft asymmetries, are also eliminated. The combined theoretical and experimental studies show angular control to be a viable alternative means of reducing flexible rotor vibrations.

Thesis (M.S.) in Civil Engineering--University of Maine, 2007. / Includes vita. Includes bibliographical references (leaves 191-197).

Zugl.: Münster (Westfalen), Universiẗat, Diss., 2007.

Universiẗat, Diss.--Hannover, 2007.