2005年德国纽伦堡石材暨技术展会推出金刚石绳锯—一种重新被发现的技术?

近来，人们对生产塑料涂覆金刚石绳锯的兴趣明显地增加。当然，这种利用金刚石串珠绳装置从岩石七切割石材荒料，本身就是一种早已使用的方法。金刚石绳锯也用于建筑业来切断楼房或桥梁。金刚石绳锯同样也可用在锯机上切割图案，比如在石料上切出一家公司的名称。金刚石绳锯甚至可用于对古教堂或古城堡的修复上，比如从一面墙上割下一整块浮雕而既不损坏浮雕也不损坏墙壁。多绳锯机（带有许多根切割绳锯机）甚至正被越来越多地用于辅助多刀头圆盘锯将大型的石材荒料切割成板材，从而使锯切深度以及加_[的板材尺寸不再受锯片半径的局限。     

Geometry-induced fluorescence resonances in small lossy capillaries

We report the first experimental demonstration of cavity-induced resonances that occur without total internal reflection. We obtained these resonances by observing the fluorescence spectrum from the molecules enclosed within a small, lossy capillary of the type used for capillary zone electrophoresis. Even with weak reflections from the capillary inner walls, enough feedback exists to superimpose resonances on the otherwise smooth fluorescence spectrum. These resonances, commonly called morphologydependent resonances or whispering-gallery modes, have typically been observed only in cavities in which total internal reflection is present.     

Anwendung von Trapezblechstegen im Brückenbau

Trapezblechstege im Brückenbau kommen trotz der großen Vorteile, die diese Bauweise bietet, in Deutschland bisher nur an einem Pilotprojekt zur Anwendung. Durch die charakteristischen Eigenschaften des Trapezbleches entstehen konstruktive und wirtschaftliche Vorteile gegenüber herkömmlichen Brückenbauweisen. Allerdings lassen die aktuell gültigen Regelwerke aufgrund fehlender Kenntnis zum Tragverhalten und mangelnder Erfahrung keine wirtschaftliche Ausbildung zu. Dies zeigt sich am Beispiel des Pilotprojekts. Die Ausbildung der Verbundfuge wurde hier nur sehr unbefriedigend gelöst und verdeutlicht somit die Notwendigkeit einfacher und praktikabler Verbindungsmöglichkeiten. Am Institut für Leichtbau Entwerfen und Konstruieren der Universität Stuttgart wurde in Zusammenarbeit mit dem Institut für Konstruktion und Entwurf ein von der Forschungsvereinigung für Stahlanwendung e. V. (FOSTA) finanziertes Forschungsvorhaben bearbeitet, bei dem unterschiedliche Verbundfugenausbildungen numerisch und experimentell untersucht wurden. Der folgende Beitrag beschränkt sich auf die Verwendung von Betondübeln als Verbundmittel und stellt hierfür ein einfaches Bemessungskonzept für die Verbundsicherung unter Längsschubbeanspruchung im Grenzzustand der Tragfähigkeit vor. The use of corrugated steel webs in bridge constructions – Load bearing behaviour of concrete dowels in combination with corrugated steel webs under longitudinal shear Studies of the load bearing behaviour under shear force of integrated connections at composite bridge girders using corrugated steel webs. Up to now there is only one project in Germany, where the application of corrugated steel webs has been practiced in the field of composite bridges. Due to the characteristics of the corrugated steel web this construction method has constructive and economic advantages. However there is a lack of experiences and standards to fully utilize these advantages and to allow an economic application. Especially the first project in Germany expose some critical points. The design of the joint between the concrete slab and the corrugated steel web is actually not satisfactory and shows the need for simpler and more practicable connection methods. At the Institute for Lightweight Structures and Conceptual Design at Universität Stuttgart and together with the Institute of Structural Design, a research project, financed by Forschungsvereinigung für Stahlanwendung e. V. (FOSTA) was made. Within this project different types of composite joints were experimentally and numerically analysed. This paper deals only with the investigations of concrete dowels as connectors. On the basis of these studies simple design rules for shear connection in the ultimate limit state were developed.     

Buprenorphine dose self-selection: Effects of an alternative reinforcer, behavioral economic analysis of demand, and examination of subjective drug effects.

Buprenorphine (BUP)-maintained patients were first exposed to various BUP doses and then chose between BUP doses and money. In the choice phase, they had 10 units exchangeable for units of BUP (constant at 3 mg/unit) or money (varied from $0.30 to $20/unit). They chose BUP exclusively (30 mg) when the money alternative was low. As available money increased, they selected lower daily BUP doses (down to 3 mg). An economic analysis indicated demand for BUP was inelastic; changes in drug intake were proportionally lower than changes in price. Subjective reports of agonist and withdrawal effects increased >200% when high and low BUP doses, respectively, were given during the exposure phase. In the choice phase, subjective drug effects were constant regardless of the BUP dose selected. Thus, BUP dose selection varies with the magnitude of alternative reinforcers, and subjective drug effects depend on whether doses are self- or experimenter-selected. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Optical beam steering using InGaAsP multiple quantum wells

We report an efficient optical beam steering device based on InGaAsP multiple quantum wells. An area-selective zinc in-diffusion process is used to define highly localized p-n junctions through which electrical currents are injected into the quantum wells. The extent of the lateral spreading of the electrical carriers can be optimized by selecting the appropriate diffusion depth. Using a twin-parallel-stripe structure, an optical beam at a wavelength of 1.51 /spl mu/m was steered over a 17-/spl mu/m range using dc electrical currents of less than 13 mA.     

Surface profiling of lithium with a laser-desorption mass-spectrometer microprobe

A laser-desorption mass-spectrometer microprobe has been developed to profile Li distributions on the crevice surfaces of Cr-plated rolled-joint hubs. A single laser pulse is used to desorb and ionize the surface species followed by detection of Li(+) in a time-of-flight mass spectrometer. Images of the surface Li distribution are obtained with a resolution of <10 mum. These images are directly compared with Li images from the more conventional secondary ion mass spectrometry technique and evaluated with respect to surface topographical features measured by secondary electron microscopy and atomic force microscopy. The laser-desorption images are shown to provide the same qualitative information as that available from secondary ion mass spectrometry.     

On the decentralized coordination of herding activities: a Jadex-based solution

The AgentContest 2009 provided a revised Cows and Herders scenario which extended the last year’s setting. First, additional environment objects, i.e., fences and switches, were introduced. Secondly, the team score is calculated by the net amount of herded cows at the game end. In this paper we present the design of the multi-agent system (MAS) prototype which participated in this contest and has been developed under usage of the Jadex multi-agent platform. The main focus of our second-time participation was to switch from the centralized coordination architecture of our previous MAS to a decentralized coordination in order to increase the single agents’ autonomy. To facilitate the development parts of the Tropos methodology were utilized. These have been extended by platform specific features (e.g. the modularization concept). During the development we were able to identify and eliminate key problems and as a result our prototype could achieve the second place in the contest.