Time filter

Source Type

Bochum-Hordel, Germany

Beckers R.,Universitatsstrasse 142
Bundesgesundheitsblatt - Gesundheitsforschung - Gesundheitsschutz

Numerous telemedical projects have not been managed to widen itself. The federal states have sponsored many projects in the past. The central question therefore is, if projects can be spread everywhere. To answer this question, at first the initiatives of the federal states are introduced very briefly. Important aspects are then defined for a nationwide behaviour. Important aspects are then defined. ln the result it turns out that the federal states play an indispensable role for telemedicine. © 2015, Springer-Verlag Berlin Heidelberg. Source

The consistent application of the observation method on shield tunnel drives can make a considerable contribution to preventative dispute avoidance and conflict reduction when issues occur. The observation method should include not only the monitoring and analysis of mechanical process data such as machine data, control parameters and data from the geotechnical instrumentation but also process control as the tunnel advances, which is documented in the following quality assurance documents: explanatory report, machine concept, incident analysis, specification, tunnelling machine handbook and the tunnelling plan before tunnelling and report after completion. This should be interpreted as a unit and is defined as the holistic observation method. © 2014 Ernst & Sohn Verlag für Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

Chowdhury P.,Indian Institute of Technology Guwahati | Mekala S.,Indian Institute of Technology Guwahati | Dreisbach F.,Universitatsstrasse 142 | Gumma S.,Indian Institute of Technology Guwahati
Microporous and Mesoporous Materials

A comparative adsorption study of three gases viz. CO, CO 2 and CH 4 on two adsorbents viz. Cu-BTC (or HKUST-1) and Cr-BDC (or MIL-101) is reported in this article. The gravimetric adsorption equilibrium measurements on the samples were performed in a Rubotherm magnetic suspension balance at three different temperatures: 295, 318 and 353 K and pressures ranging between 0 and 100 bar. Virial-Langmuir model was used to model the experimental data on Cu-BTC, whereas Dual Site Langmuir (DSL) model was used for adsorption on MIL-101. For all gases the enthalpy of adsorption at low loading was higher on MIL-101 than that on Cu-BTC, indicating the availability of open metal sites in case of MIL-101. Moreover, a sharp decrease in enthalpy of adsorption is observed in case of MIL-101, whereas only a moderate decrease is observed in case of Cu-BTC. CO has a large Henry's constant on MIL-101, whereas at higher pressures, the solid exhibits better capacity for CO 2. In case of Cu-BTC, CO 2 has a higher capacity on the adsorbent as compared to the other two gases throughout the entire range of pressures studied. All the experimental data is critically analyzed by examining the role of open metal centers, adsorbate polarity and the effect of temperature on the electrostatic interactions. © 2011 Elsevier Inc. All rights reserved. Source

Fieback T.M.,Ruhr University Bochum | Dreisbach F.,Universitatsstrasse 142
Industrial and Engineering Chemistry Research

For sorption measurements many different methods are applicable, but nearly all of them require a correction of the raw experimental data by a factor including the sample's volume. This can be determined by a separate volume measurement for samples with constant volumes. If the sample volume is not constant because of swelling effects, the actual volume is usually calculated by suitable equations of state (EOS) for the sample-gas-system (if available) or estimated by optical or spectroscopic sample observation and assumptions about orientation of swelling. The advantage of the new approach presented here is that one measurement leads to both unknown quantities: sample volume and absorption. Not only is the volume measurement for constant sample volumes is obsolete, also the actual volume of swollen samples can be determined with minimal effort. The method can be applied to liquid and solid state samples without optical or spectroscopic sample observation or any assumption about orientation of swelling. © 2011 American Chemical Society. Source

Nebel M.,Ruhr University Bochum | Eckhard K.,Ruhr University Bochum | Erichsen T.,Universitatsstrasse 142 | Schulte A.,Suranaree University of Technology | Schuhmann W.,Ruhr University Bochum
Analytical Chemistry

4D shearforce-based constant-distance mode scanning electrochemical microscopy (4D SF/CD-SECM) is designed to assess SECM tip currents at several but constant distances to the sample topography at each point of the x,y-scanning grid. The distance dependent signal is achieved by a shearforce interaction between the in-resonance vibrating SECM tip and the sample surface. A 4D SF/CD-SECM measuring cycle at each grid point involves a shearforce controlled SECM tip z-approach to a point of closest distance and subsequent stepwise tip retractions. At the point of closest approach and during the retraction steps, pairs of tip current (I) and position are acquired for various distances above the sample surface. Such a sequence provides x,y,I maps, that can be compiled and displayed for each selected data acquisition distance. Thus, multiple SECM images are obtained at known and constant distances above the sample topography. 4D SF/CD-SECM supports distance-controlled tip operation while continuous scanning of the SECM tip in the shear-force distance is avoided. In this way, constant-distance mode SECM imaging can be performed at user-defined, large tip-to-sample distances. The feasibility and the potential of the proposed 4D SF/CD-SECM imaging is demonstrated using on the one hand amperometric feedback mode imaging of a Pt band electrode array and on the other hand the visualization of the diffusion zone of a redox active species above a microelectrode in a generator/collector arrangement. © 2010 American Chemical Society. Source

Discover hidden collaborations