DE – Page 29 – TechConnect Briefs

Bias Dependent Modeling of Collector-Base Junction Effects in Bipolar Transistors

Tran H., Schroter M., University of Technology Dresden, DE

An analytical formulation for the voltage and current dependent electric field in the collector of a bipolar transistor is presented. The new field expression is then employed for calculating the base-collector depletion capacitance and the [...]

Bottom-Up meets Top-Down – A Novel Approach towards 3-D Optical Devices

Houbertz R., Cochet S., Domann G., Popall M., Serbin J., Ovsianikov A., Chichkov B.N., Fraunhofer ISC, DE

Inorganic-organic hybrid polymers suitable for optical applications, were synthesized by catalytically controlled hydrolysis/polycondensation reactions. The resulting resins are build-up by organically functionalized nm-size primary particles (oligomers). Due to the variety of alkoxysilanes and synthesis parameters, [...]

Two-Regime Hollow PDMS Abbe Prism for u-TAS Applications

Llobera A., Wilke R., Büttgenbach S., Institut für Mikrotechnik, DE

A new robust and compact system, which comprises a PDMS-based hollow Abbe prism and microlenses, together with self-alignment channels for optical fibre positioning, is presented. This optical detection method has two different regimes for signal [...]

Optimized Distributive u-Mixing by Chaotic Multilamination

Schönfeld F., Drese K.S., Hardt S., Hessel V., Hofmann C., Institut für Mikrotechnik Mainz –(IMM), DE

We present a new type of micro mixer relying on a multi-step split-and-recombine (SAR) approach. Using computational fluid dynamics (CFD), a favourable mixer design is identified which allows for an almost ideal multilamination. The numerical [...]

Galilean Invariant Viscosity Term for an Athermal Integer Lattice Boltzmann Automaton in three Dimensions

Geier M.C., Greiner A., Korvink J.G., IMTEK, Albert Ludwigs University Freiburg im Breisgau, DE

The athermal lattice Boltzmann automata (LBA) are promising replacements for Navier Stokes solvers in computational fluid dynamics (CFD). They are inherently parallel, scale exactly linear with the number of computational elements and can be applied [...]

Development of a Slug-Flow PCR Chip with Minimum Heating Cycle Times

Hardt S., Dadic D., Doffing F., Drese K.S., Münchow G., Sörensen O., Institute of Microtechnology Mainz, DE

A microfluidic PCR device is presented capable of rapid temperature ramping and handling of sample volumes in the microliter and submicroliter range. The PCR chip comprises a straight micro channel in which a sample slug [...]

High Throughput in-silico Screening against Flexible Protein Receptors

Merlitz H., Wenzel W., Forschungszentrum Karlsruhe, DE

Virtual screening of chemical databases to targets of known three-dimensional structure is developing into an increasingly reliable method for finding new lead candidates in drug development. Both better scoring functions and novel docking strategies contribute [...]

Forisomes: Mechano-Proteins that Exert Force in Contraction and Expansion

Knoblauch M., Noll G.A., Prüfer D., Jaag H., Fontanellaz M.E., Schneider-Hüther I., van Bel A.J.E., Peters W.S., Fraunhofer Institute IME, DE

Motor-proteins are the basis of the dynamic three dimensional organization of the living cell. Most motor-proteins are driven by energetically favorable reactions such as ATP hydrolysis. We here describe anisotropic contractility in forisomes, protein bodies [...]

Voltage Current Curve of a PEM Fuel Cell

Kulikovsky A.A., Research Center - Juelich, DE

First we consider 1D problem of the cathode catalyst layer (CCL) performance. The general solution is presented and simple analytical formulas for CCL polarization voltage are obtained. Based on these formulas we build a simple [...]

Biomimetic Surface Composite Effects Achieved by Interfering Laser Beams

Liu K.W., Liu Z.F., Daniel C., Liu K.W., Liu Z.F., Mücklich F., Saarland University, DE

It is observed from nature that certain insects possess the optimised surface fixing configurations against sliding and the tree body consists of different kinds of micro/nano-tissues with optimised properties to prevent breaking by wind. The [...]