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The effects of soil disturbance caused by the uprooting of a single or a few canopy trees on species richness and composition of vascular plant species and bryophytes were examined in a temperate beech forest (Fagus sylvatica) in northern Germany. We recorded the vegetation in 57 pairs of disturbed and adjacent undisturbed plots and established a(More)
The large majority of microelectromechanical systems (MEMS) are fabricated on silicon, glass or Pyrex substrates by manufacturing techniques, which originated from the semiconductors industry. However, their final application often requires removal of the fabrication substrate or at least a partial release of some section of the device. This paper describes(More)
We propose a novel approach to intraocular pressure (IOP) measurement allowing minimal invasive continuous monitoring over prolonged periods, regardless of patient position and activities. The key element of this innovative measurement method is a soft contact lens with a microfabricated strain gage embedded allowing the measurement of the cornea curvature(More)
A new electrically conductive photosensitive composite resist has been formulated and used to build micro-components. This composite material is based on the SU-8 photopolymer, an insulating negative-tone photoresist, in which silver nano-particles have been dispersed to enhance the electrical properties of the polymer. The properties of this new(More)
In this paper, a survey is made of some technologies in which the photo-definable polymer is used as structural material and where physical properties of polymers are modified to change porosity, mechanical or electrical properties. The paper is organized in three sections: (a) 2D, multilayer photopolymers, (b) High aspect ratio and (c) 3D(More)
This paper describes the development of a polyimide-based MEMS strain-sensing device. Finite element analysis was used to investigate an artificial knee implant and assist on device design and to optimize sensing characteristics. The sensing element of the device was fabricated using polyimide micromachining with embedded thin-metallic wires and placed into(More)
We present the fabrication, characterization, use in cortical recording and histological results of a flexible implantable neural probe. The device is microfabricated in polyimide and platinum, allowing for greater flexibility. It incorporates two layers of platinum electrodes, which greatly reduces the size of neural probes and limits the insertion damage.(More)
Mixing liquids on the micro-scale is difficult because the low Reynolds numbers in microchannels and in microreactors prohibit the use of conventional mixing techniques based on mechanical stirring which induces turbulence. Static mixers can be used to solve this mixing problem. In this paper, micromixers having geometries very close to those of(More)
This paper reports on the technology development and characterization of polyimide-based, microfluidic channels with integrated nanoporous membranes. A layer transfer and lamination technique is used to fabricate flexible microchannels from spin-on polyimide. The microfluidic channels can be operated at high pressures and flow rates without leakage.(More)
This paper describes new polymer/ceramic photosensitive resins that can be used in the microstereolithography process for manufacturing complex 3D components in composite material. These new resins contain high loads (up to 80 wt.%) of alumina nanoparticles, used as fillers in a photosensitive acrylate-based resin of low viscosity. With the(More)