非欧几何形式对传统空间的拓展

通过对彼得·库克、科林·福涅尔所设计的格拉茨美术馆进行空间文脉的分析，试图找到非欧几何形式中传统空间的影子，来说明建筑师是如何继承前人而又有所创新的。     

控制爆破技术在坪上集水廊道开挖中的应用

针对山西坪上应急引水工程复杂环境下集水廊道开挖的具体情况,提出了"两侧先行预裂、再横向拉槽创造临空面、最后进行主体廊道爆破"的施工方法,有效地控制了爆破振动及飞石对临近公路、路边民房、上方通讯线路及水源的损害,为同类工程提供了有益的经验。     

深圳市废弃采石场水土保持生态环境建设措施

根据深圳市一些废弃采石场具体情况，提出其水土保持生态环境建设治理措施。     

艺术画廊的照明研究

本文针对艺术画廊照明进行探讨,从颜色特性,展品照明,展示空间照明几个方面分别进行分析研究。     

天津市西青区规划展览馆及年画馆方案设计

结合天津杨柳青镇的历史文化背景,对天津市西青区规划展览馆及年画馆方案设计进行了研究,对该项目进行了定位分析和理念提炼,阐述了具体的设计策略,并将两种方案进行了比较,从而确定最终设计方案,为同类场馆设计提供了指导。     

High‐Quality Whispering‐Gallery‐Mode Lasing from Cesium Lead Halide Perovskite Nanoplatelets

Semiconductor micro/nano‐cavities with high quality factor (Q) and small modal volume provide critical platforms for exploring strong light‐matter interactions and quantum optics, enabling further development of coherent and quantum photonic devices. Constrained by exciton binding energy and thermal fluctuation, only a handful of wide‐band semiconductors such as ZnO and GaN have stable excitons at room temperature. Metal halide perovskite with cubic lattice and well‐controlled exciton may provide solutions. In this work, high‐quality single‐crystalline cesium lead halide CsPbX₃ (X = Cl, Br, I) whispering‐gallery‐mode (WGM) microcavities are synthesized by vapor‐phase van der Waals epitaxy method. The as‐grown perovskites show strong emission and stable exciton at room temperature over the whole visible spectra range. By varying the halide composition, multi‐color (400–700 nm).WGM excitonic lasing is achieved at room temperature with low threshold (~ 2.0 μJ cm^?2) and high spectra coherence (~0.14–0.15 nm). The results advocate the promise of inorganic perovskites towards development of optoelectronic devices and strong light‐matter coupling in quantum optics.     

大梁隧道出口巷道式通风方案设计与实施

对大梁隧道出口施工组织情况进行了分析,前期采用压入式通风,后期利用平导进行巷道式通风,就正洞、平导所需的风量及风压分别进行了计算,并对通风系统维护、管理等环节进行了论述,为今后类似隧道通风提供了借鉴。     

Single Nanoparticle Detection Using Optical Microcavities

Detection of nanoscale objects is highly desirable in various fields such as early‐stage disease diagnosis, environmental monitoring and homeland security. Optical microcavity sensors are renowned for ultrahigh sensitivities due to strongly enhanced light‐matter interaction. This review focuses on single nanoparticle detection using optical whispering gallery microcavities and photonic crystal microcavities, both of which have been developing rapidly over the past few years. The reactive and dissipative sensing methods, characterized by light‐analyte interactions, are explained explicitly. The sensitivity and the detection limit are essentially determined by the cavity properties, and are limited by the various noise sources in the measurements. On the one hand, recent advances include significant sensitivity enhancement using techniques to construct novel microcavity structures with reduced mode volumes, to localize the mode field, or to introduce optical gain. On the other hand, researchers attempt to lower the detection limit by improving the spectral resolution, which can be implemented by suppressing the experimental noises. We also review the methods of achieving a better temporal resolution by employing mode locking techniques or cavity ring up spectroscopy. In conclusion, outlooks on the possible ways to implement microcavity‐based sensing devices and potential applications are provided.     

Searching for Mobile Intruders in a Polygonal Region by a Group of Mobile Searchers

The problem of searching for mobile intruders in a polygonal region by mobile searchers is considered. A searcher can move continuously inside a polygon holding a flashlight that emits a single ray of light whose direction can be changed continuously. The vision of a searcher at any time instant is limited to the points on the ray. The intruders can move continuously with unbounded speed. We denote by ps(P) the polygon search number of a simple polygon P , which is the number of searchers necessary and sufficient to search P . Let n , r , b , and g be the number of edges, the number of reflex vertices, the bushiness, and the size of a minimum guard set of P , respectively. In this paper we present matching upper and (worst case) lower bounds of 1 + \lfloor log ₃ (2b+1) \rfloor on ps(P) . Also upper bounds on ps(P) in terms of n,r , and g are presented;ps(P) ≤ 1 + \lfloor log ₃ (n-3) \rfloor, ps(P) ≤ 1 + \lfloor log ₃ r \rfloor , and ps(P) ≤ 2 + \lceil log ₂ g \rceil . These upper bounds are tight or almost tight in the worst case, since we show that for any natural number s \geq 2 , there is a polygon P such that ps(P) = log ₃ (n+1) = log ₃ (2r+3) = 1 + log ₃ (2g-1) = s . Received September 4, 1998; revised May 25, 1999.