摘要：In a typical tension leg platform (TLP) design,the top tension factor (TTF),measuring the top tension of a top tensioned riser (TTR) relative to its submerged weight in water,is one of the most important design parameters that has to be specified properly. While a very small TTF may lead to excessive vortex induced vibration (VIV),clashing issues and possible compression close to seafloor,an unnecessarily high TTF may translate into excessive riser cost and vessel payload,and even has impacts on the TLP sizing and design in general. In the process of a production TTR design,it is found that its outer casing can be subjected to compression in a worst-case scenario with some extreme metocean and hardware conditions. The present paper shows how finite element analysis (FEA) models using beam elements and two different software packages (Flexcom and ABAQUS) are constructed to simulate the TTR properly,and especially the pipe-in-pipe effects. An ABAQUS model with hybrid elements (beam elements globally + shell elements locally) can be used to investigate how the outer casing behaves under compression. It is shown for the specified TTR design,even with its outer casing being under some local compression in the worst-case scenario,dynamic buckling would not occur;therefore the TTR design is adequate.

摘要：无人机载和单兵的能力需求继续推动缩小尺寸、重量和功率(SWaP)和高灵敏度红外(IR)成像的应用,在以前,这些应用不切实际。现在,为了满足这些需求,Attollo工程公司开发了一款1280×1024、5mm像元间距的制冷中波红外(MWIR)传感器,在像元间距方面取得了突破,此外还开发了1280×1024、10mm像元的双波段传感器,在短波红外(SWIR)中具有更高的灵敏度,以利用SWIR现象,其中包括激光定位(laser see spot)功能。这两种传感器都提供MWIR传感功能,但也能够利用Attollo探测器设计的各个方面,实现不同程度的SWIR传感。这类制冷小像元、单波段和双波段红外传感器技术代表了传感器设计和开发的各个方面的进步,我们将讨论Attollo为实现这一能力所做的创新,包括基于III-V族化合物半导体的外延探测器设计、探测器阵列和焦平面阵列制造、低噪声设计、双波段CTIA/DI读出集成电路(ROIC)、真空杜瓦封装、电子和固件设计。在本文中,我们将介绍高清晰度小像元间距MWIR和双波段SWIR/MWIR成像技术在Attollo的现状,它涉及到上述传感器,包括设计和测量数据及成像。

摘要：在应用于化学加工、石油炼制、石油化工和基础重工业生产的众多工业气体过滤的气固分离中,烧结金属过滤系统被证实是一种高效、可靠和经济的选择。叙述了工业应用的,特别是要求半固定过滤的在高温高压下腐蚀环境中应用的烧结金属粉末或者烧结金属纤维过滤器的优点,讨论了所选应用领域,包括流化催化裂化(FCC)和连续催化重整/脱硫(CCR)的过滤器的操作和性能。

摘要：在第六届"培青计划"暨首届中国当代舞双年展期间,主办方特邀英国伦敦萨德勒之井剧院、法国夏洛宫国家舞蹈剧院、英国伦敦老地方舞蹈中心、奥地利林茨国家剧院和德国达姆施塔特国家剧院的五位剧院艺术总监,以"舞蹈制作的秘方"为主题展开谈话。他们分别从各自剧院的基本情况、运作模式、各类项目和资金来源、作品制作类型等几个方面进行了介绍与讨论。强调了剧场在艺术家与观众之间的桥梁作用;重点关注艺术家的培养和舞蹈作品制作之间的关系;分享各自委约联合项目的具体策划细节和如何进行卓有成效的舞蹈推广等经验方法。