博根-贝尔森集中营纪念馆新文献和信息中心

这是一个长200米,宽18米,舒展而且具有纪念性的建筑--博根-贝尔森集中营纪念馆的新文献和信息中心.这个两层的建筑于2007年10月竣工,建筑面积6 163平方米,建筑容积25 300立方米.形式严格遵循功能的需求,在Heidewald森林的中央,原集中营的旁边,就像一个动态延伸的可进入雕塑.它的特殊建筑体量,极少主义的单色建筑外墙,没有任何装饰,以及巨大的体量上极少的建筑表面起伏与开窗,使建筑形成了强有力而意义深刻的表情.在关押受害人的地方,它以其自信而不唐突的方式表达了一个符合国际标准的纳粹罪行文献和研究中心功能及其重要历史意义的新形式,并且符合设计任务的要求.     

法兰克福贸易会展中心

如今,一个标志性的弯曲形态指示着法兰克福贸易会展中心的入口,使其更加引人注目.包含宴会大厅在内的论坛是该贸易会展中心的核心区域,它轻盈的结构和通透的立面,与其后面的固定展厅厚重而巨大的体量形成清晰的对比.     

Injection à très haute pression

Un jet à très haute pression d'eau et d'air en même temps qu'une injection de pâte de ciment est en train de ?révolutionner? la pratique des injections dans le sol et consolidation des fondations. Cette technique développée en Suède est brièvement exposée ici. L'article s'appuie sur une note résumée publiée par le Conseil suédois pour la recherche sur la construction.     

All-solid-state tunable continuous-wave ultraviolet source with high spectral purity and frequency stability

We present a novel approach for the generation of higly frequency-stable, widely tunable, single-frequency cw UV light that is suitable for high-resolution spectroscopy. Sum-frequency generation (SFG) of two solid-state sources with a single cavity resonant for both fundamental waves is employed. Using a highly stable, narrow-linewidth frequency-doubled cw Nd:YAG laser as a master laser and slaving to it the SFG cavity and the other fundamental wave from a Ti:sapphire laser, we generate UV radiation of 33-mW output power around 313 nm. Alternatively, we use a diode laser instead of the Ti:sapphire laser and produce an output power of 2.1 mW at 313 nm. With both setups we obtain a continuous tunability of >15 GHz, short-term frequency fluctuations in the submegahertz range, a long-term frequency drift below 100 MHz/h, and stable operation for several hours. The theory of optimized doubly resonant SFG is also given.     

An enhancement to the IEEE 802.11e EDCA providing QoS guarantees

One of the challenges that must be overcome to realize the practical benefits of ad hoc networks is quality of service (QoS). However, the IEEE 802.11 standard, which undeniably is the most widespread wireless technology of choice for WLANs and ad hoc networks, does not address this issue. In order to support applications with QoS requirements, the upcoming IEEE 802.11e standard enhances the original IEEE 802.11 MAC protocol by introducing a new coordination function which has both contention-based and contention-free medium access methods. In this paper, we consider the contention-based medium access method, the EDCA, and propose an extension to it such that it can be used to provide QoS guarantees in WLANs operating in ad hoc mode. Our solution is fully distributed, uses admission control to regulate the usage of resources and gives stations with high-priority traffic streams an opportunity to reserve time for collision-free access to the medium.     

Pseudomonas keratitis. The role of an uncharacterized exoprotein, protease IV, in corneal virulence

PURPOSE: The role of exoproteins in the pathogenesis of Pseudomonas aeruginosa keratitis was investigated in three animal models by assessing the relationship between corneal virulence and the activities of exotoxin A, elastase, alkaline protease, and an uncharacterized protease, protease IV. METHODS: The four Pseudomonal strains tested included a prototype strain (ATCC 27853) producing exotoxin A, elastase, and alkaline protease; a parent strain (PA103) producing only exotoxin A and protease IV; a mutant (PA103-29) producing only protease IV; and a mutant (PA103-AP1) producing exotoxin A and having only approximately 5% of the protease IV activity of its parent. Corneal virulence was evaluated in the mouse scratch, rabbit scratch, and rabbit intrastromal models in terms of clinical signs (slit lamp examination, slit lamp examination), and viable bacteria. RESULTS: Protease IV, the only protease produced by PA103 and PA103-29, was found to produce a unique band on zymograms (120 kDa) and to react distinctively with a synthetic substrate. Evidence for the role of protease IV in corneal virulence included two findings: PA103-29,which produced protease IV but not the other exoproteins, caused infections that were as severe as those caused by the prototype strain (ATCC 27853) in all three models (P>0.24); and PA103-AP1, the strain deficient in 95% of the parent protease IV activity, mediated infections characterized by slit lamp examination scores significantly lower than those of infections caused by the parent (PA103) or the prototype strain (ATCC 27853) in the rabbit and mouse scratch models (P<0.02). CONCLUSIONS: Protease IV was found to be a novel Pseudomonas protease contributing to corneal virulence in rabbits and mice when infections were initiated at the corneal surface. Furthermore, production of protease IV in low quantities was sufficient for virulence when the topical stages of keratitis were bypassed by an intrastromal injection of Pseudomonas.