Polarized light microscopy : By

Optical microscopy was one of the earliest tools of forensic science. Today, it retains a position of dominance in laboratory investigations because of its wide applicability, the rapid results which it yields and its ability to extract information from very small specimens.     

Forensic microscopy

Optical microscopy was one of the earliest tools of forensic science. Today, it retains a position of dominance in laboratory investigations because of its wide applicability, the rapid results which it yields and its ability to extract information from very small specimens.     

Electrically injected visible (639-661 nm) vertical cavity surface emitting laser

The first electrically injected visible InAlGaP/AlGaAs vertical cavity surface emitting lasers are reported. The devices consist of an InAlGaP optical cavity active region surrounded by AlAs/AlGaAs distributed Bragg reflectors. Pulsed room temperature lasing has been observed at wavelengths from 639 to 661 nm. At 650 nm, thresholds of 30 mA at 2.7 V were measured on test devices with a 20 mu m emission diameter. Peak output power exceeds 3.3 mW.<>     

Analysis of noble metals—Overview and selected methods : By

Chronopotentiometry has been successfully carried out on one drop of solution. A simple arrangement enabled determinations to be performed in one to two minutes. A potential holdup was clearly indicated for the oxidation of iodide ions on electrolyzing 0.07 ml of a 5·10^-6M potassium iodide solution 1M in sulfuric acid, a total of 3.5·10^-10 equivalents of iodide ions.     

Drop-scale chronopotentiometry

Chronopotentiometry has been successfully carried out on one drop of solution. A simple arrangement enabled determinations to be performed in one to two minutes. A potential holdup was clearly indicated for the oxidation of iodide ions on electrolyzing 0.07 ml of a 5·10^-6M potassium iodide solution 1M in sulfuric acid, a total of 3.5·10^-10 equivalents of iodide ions.     

A rapid microdetermination of chlorine dioxide in the presence of active chlorine compounds

A titrimetric and spectrophotometric procedure has been developed for the determination of ClO₂ in water samples. The procedure is rapid, accurate, and free of normal interferences present in water. It is based upon the reaction of ClO₂ with substituted halophenol indicators.     

Oxide-confined 850 nm VCSELs operating at bit rates up to 40 Gbit/s

Oxide-confined 850 nm vertical-cavity surface-emitting lasers operating at 40 Gbit/s at current densities ~10 kA/cm² are realised. The deconvoluted rise time of the device is below 10 ps and remains hardly temperature sensitive up to 100degC.     

Performance analysis of a wireless ad hoc network with QoS support

A wireless ad hoc multihop network is introduced and protocols for the air interface are described and evaluated. Ad hoc networks can be realized due to the ability of stations to route connections according to the current meshing of the network. The decentrally organized network is able to guarantee the bandwidth contracted to a connection in a hidden station environment by means of contention-free data transmission, for both, channel and packet switched services, based on real channel connections. Channels are established and used for the duration of a so called train of data packets, released when the train ends and re-established when the next train arrives. To guarantee available capacity of the network for the re-establishment of a connection and to guarantee the quality of service needed for a wireless extension of a fixed ATM network, connection admission control is applied considering the overall interference situation and the current meshing of the stations in the network.For the purpose of realistic and reliable performance analysis a simulation tool appropriate for the investigation of the proposed network is introduced, and performance results for the proposed protocols are given by means of event-driven simulation studies in example scenarios. The simulated protocols have been formally specified in SDL, translated to C++, and embedded into a simulation environment.