Hochrate. Grundlagenuntersuchungen zur Erhoehung des energetischen Wirkungsgrades lasererzeugter Partikelstroeme. Teilvorhaben: Untersuchungen zur Bildung von Partikelstroemen mit UV-Laserstrahlung Abschlussbericht

Subject of the project was the investigation of fundamental processes of the formation of particle fluxes at pulsed laser irradiation of solid targets with high energetic pulsed UV excimer laser radiation. It has been shown, that the parameters of particle fluxes (plasma composition, density, ionisation degree, energy distribution of the particles, deposition rate) strongly depend on the laser parameters. As a result optimal deposition conditions can be choosen with regard to desired film properties. Under certain conditions the deposition rate could be increased up to two orders of magnitude. (orig.)Available from TIB Hannover: F99B121+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

The Analysis of Directional Time Series: Applications to Wind Speed and Direction, ser. Lecture Notes in Statistics

Abstract The proper functioning of many of our social, financial, and political structures nowadays relies on the correct identification of people. Reliable and unique identification of people is a difficult problem; people typically use identification cards, usernames, or passwords to prove their identities, however passwords can be forgotten, and identification cards can be lost or stolen. Biometric methods, which identify people based on physical or behavioural characteristics, are of interest because people cannot forget or lose their physical characteristics in the way that they can lose passwords or identity cards. Biometric systems have been developed based on fingerprints, facial features, voice, hand geometry, handwriting, the retina, and the one presented in this work, the iris. Iris is difficult issue because of pre-processing and segmentation phases. In other word, preparing the iris in a rectangular image format is a complicated issue. This work concentrates on segmentation issue. A good segmentation reflects on perfect recognition with minimum number of features. With only three features, 100% recognition can be achieved. A comparative study between different methodologies is introduced. This study shows the efficiency of the proposed model. Keywords- ABSTRACT The task of planning patrol routes for crime prevention is an important challenge. This work concentrates on the context of routes for police patrols on a road network; the presented methods are applicable to many other environments that call for the selection of surveillance and situation response routes to maximize the profit. In other words, planning patrol routes to maximize coverage of important locations (hot spots) at minimum cost (length of patrol route) subject to some constraints. We model a road network using an edge-weighted graph in which edges represent streets, vertices represent intersections, and weights represent importance of the corresponding streets. In addition to the importance of streets (edge weights), important routes are affected by the topology of the road network. This paper is considered the integrated optimization of strategic patrol routing problems while designing an efficient operating plan for the police troopers. Its formulation is a methodological contribution to the current literature. In this work, a new methodology is introduced for energy saving control problem in police patrols networks. The objective function is minimizing the variance of the power vector for the topology troopers, this means that distributing the power of the police patrols and maintaining the crime prevention with minimum effort. Inputs are given as a set of nodes in a plane, end-to-end traffic demands and delay bounds between hot spot pairs, the problem is to find an optimized routing that can meet the requirements and the variance of the power vector for the nodes is minimized. The problem is formulated as an Integer Linear Programming problem. An optimal algorithm has been proposed to solve the problem. The proposed model can be adopted for different topology with different emergency request demands

Laser assisted plasma-jet-CVD deposition of hard film systems Final report

The project was intended on the investigation of high productivity laser assisted plasma-jet deposition procedures in application to such superhard materials as diamond and boron nitride films. Most of the works has been done at the department 'Laser Induced Surface Phenomena' of General Physics Institute -GPI- in Moscow. Special experimental program has been carried out by visiting scientists from GPI at the facilities of Bremen Institute of Applied Beam Technology -BIAS-. High power 10 kW fast axial gas flow DC discharge plasma-jet system (Jet-1) was successful tested. Two of these plasma-jet-CVD devices were manufactured in Russia: one of them for GPI, the second one for BIAS with regard to future joint research work. Furthermore a DC arc plasma device at GPI facilities has been modified and used as a model system for test a number of the Jet-1 technical solutions. In preparation for future experiments with plasma-jet investigations on CVD processes of various carbon films by DC arc discharge were carried out. Polycrystalline and nanocrystalline diamond films were obtained. These films was analysed by various techniques (SEM, XPS, XAES, Raman Spectroscopy, FTIR, hardness measurements). The possibility to modify and improve deposited film quality (e.g. smoothness) and structure (e.g. selective area film growth) by UV excimer laser irradiation has been demonstrated. Also laser induced plasma processes were investigated. (orig.)SIGLEAvailable from TIB Hannover: F95B2179+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman

Grundlagenuntersuchungen zum lasergestuetzten Plasma-Jet-CVD-Abscheiden von Schichtsystemen Schlussbericht

The aim of the project was the systematic investigation of laser assisted plasma CVD processes for synthesis of superhard film systems on the basis of carbon or boron nitride respectively. By a successful connection of the known how of scientists from General Physics Institute Moscow (GPI) on the field of plasma jet CVD and the experiences of BIAS on the field of laser assisted deposition a scientific-experimental basis has been developed for further cooperation in laser assisted plasma CVD technique. A 10 kW DC plasma jet system, constructed by scientists from GPI, has been installed in BIAS and was put in operation. With this apparatus polycrystalline anhd nanocrystalline diamond films were deposited on different substrate materials. The substrates or films respectively have been irradiated before, during or after the deposition process. The influence of UV laser radiation on the film properties has been investigated. It was shown that under certain conditions the film properties can be modified and improved. Examples are the increase of adhesion of diamond films on cutting tools (WC(Co)) and the demonstration of a selective deposition technique. Further priorities in the project were the investigation of laser assisted ECR plasma CVD of amorphous diamond-like carbon films as an model example for laser modification of carbon films and first test investigations of photolytical UV laser assisted synthesis of born nitride films from the gas phase (laser CVD). (orig.)Available from TIB Hannover: F96B1503+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman