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Knowledge of the features and qualities of a machine element are essential foundations for its successful operation. High grade materials, more accurate calculation methods and modern manufacturing processes lead to continuous design and performance improvements and hence increased power within minimised spatial requirements. INA cylindrical roller bearings, series SL 1923.., ZSL 1923.. and LSL 1923.. follow this trend and due to their high performance characteristics and low physical volume they have obtained a firm place as high performance machine elements. Essential characteristics of radial cylindrical roller bearings are their behaviour regarding kinematics, noise, vibration, dynamic frictional torque, cage speed, speed of a rolling element, slip etc. The paper gives details of the kinematic behaviour concerning the relationship between the roller set speed or the cage speed and the speed of a rolling element in connection with the occurrence of smearing. This kind of damage occurs during the running in stage of a machine and is becoming very important because of the enormous costs which are caused by down time and lost production.
Online Measurement of mechanical parameters by using CAM (Computer Aided Measurement) is a new advanced technique in the field of measurement. Taking special measurement software DASYLab as an example, this paper describes the basic principles and unique advantages of this technique. The application of CAM is explained through an example of measurements of temperature, flow rate and pressure.
Based on the full state-controller theory, a new ob-server-controller for MAGLEV vehicles considering the guideway elasticity was proposed in early publi-cations in Germany and now realized in practice in China. It is expected to eliminate the phenomenon of the vehicle-guideway coupling vibration caused by the hypothesis of a rigid guideway, which usually happens in the current high-speed MAGLEV line, and reduce the over dependence of system stability on the guideway properties. A test rig for the elastic guideway levitation system was founded and the effectiveness of the new observer-controller was verified.
The efficiency of text input by today’s smartphones is significantly limited by the small extents of the virtual keyboard displayed for allowing alphanumeric inputs. Future smartphones will integrate projectors which allow to project multimedia content as well as the smartphones’ dialogs. This paper introduces a concept to project the whole smartphone’s display onto a surface allowing the user to realize text inputs by interacting with the virtual keyboard projection. This projection is analyzed by standard image processing algorithms. Finally, an experimental implementation shows the feasibility of this concept.
Die Zahl an dementiell erkrankten Menschen steigt, eine wirksame Therapie ist nicht in Sicht. Aus der Erforschung der Risikofaktoren ist abzuleiten, dass motorische, kognitive und soziale Programme für die Prävention eine elementare Rolle spielen. Sie müssen allerdings möglichst frühzeitig begonnen werden, und zwar zu einem Zeitpunkt, zu dem die medizinische Diagnostik nur eine sog. leichte kognitive Beeinträchtigung feststellt, die für sich genommen noch gar keinen Krankheitswert hat, deren Übergangsrate zur Alzheimer-Demenz jedoch ca. 10 % beträgt.
This paper compares the Federal Reserve System and the Eurosystem in four aspects. These are the institutional level, the monetary policy instruments, the operational framework and the monetary policy strategy applied. It highlights the similarities, the differences as well as the efficiency of the different settings.
Die Anregung der im Nachfolgenden dargestellten Untersuchung verdanken die Verfasser Herrn Prof. Dr.-Ing. Dieter Tremmel.
Das vorliegende Werk kann als Fortsetzung der Arbeiten [1] und [2] angesehen werden. Es handelt sich um die geometrische Synthese von Verzahnungen mit windschiefen Achsen, die aus einem schräg- und einem geradverzahnten Zahnrad be-stehen. In der umfangreichen Literatur, die der Geometrie der Verzahnungen gewidmet ist (vgl. z.B. [3]-[14]), ist für diesen Fall kein einziges konkretes Beispiel zu finden.
Up to now, cytokines have been regarded as difficult parameters for the characterisation of the immune system. The study shows that, depending of the type of cytokine, the variability of these potent mediators of immune functions in fact be high high between subjects, but relatively small within a subject. By using appropriate statistical techniques, the use of cytokines as endpoints in investigational clinical studies has become possible.
Jahresbericht 2012/13
(2013)
This paper discusses the possibilities of IPtechnologies for information protection. An analysis of modern information protection Soft-Cores which support symmetric block ciphers is given. Development perspectives of the Soft-Cores are described. The DES Algorithm and the variations of the architecture of the DES Soft-Core models are considered, their analysis provided and they are compared with some existing DES Soft-Cores on the world market. Two architectures - iterative and pipelined - are identified. Twenty six variations of the DES Soft-Core are proposed and a comparative analysis of their architecture is given. The proposed DES Soft-Cores support all of the discussed functional possibilities. Thus a high performance is achieved, the equipment volume for their realization is lowered and they can be used effectively in a wide spectrum of the application fields.