摘要：Cavity resonance noise of passenger car tires is generated by interacting excitation between a tire structure and the fill gas (air), and generally lies in a frequency range of 200?250 Hz. As such, this noise is strongly perceived and may be a serious source of driver annoyance. Thus, many studies regarding the cavity noise mechanism and its reduction have already been conducted. In this work, a vibro-acoustic coupled analysis was conducted between a tire structure and air cavity. Using this analysis, we can more accurately simulate the tire noise performance in the region of the cavity resonance frequency. An analysis of the effects of variation of tire contour design factors was conducted, using design-of-experiments methods. Finally, a multi-objective optimization was performed using in-house codes to reduce the cavity noise level while minimizing the loss of other performances, such as diminished ride comfort and handling caused by the variations of contour. As a result of this optimization, an optimized contour shape was derived, which satisfied the multi-objective performances.

摘要：The Rare isotope Accelerator Of Newness（RAON） heavy-ion accelerator has been designed for the Rare Isotope Science Project（RISP） in Korea. The RAON will produce heavy-ion beams from 660-MeV-proton to200-MeV/u-uranium with continuous wave（CW） power of 400 k W to support research in various scientific *** system consists of an ECR ion source, LEBTs with 10 ke V/u, CW RFQ accelerator with 81.25 MHz and 500 ke V/u, a MEBT system, and a SC linac. In detail, the driver linac system consists of a Quarter Wave Resonator（QWR） section with 81.25 MHz and a Half Wave Resonator（HWR） section with 162.5 MHz, Linac-1, and a Spoke Cavity section with 325 MHz, Linac-2. These linacs have been designed to optimize the beam parameters to meet the required design goals. At the same time, a light-heavy ion accelerator with high-intensity beam, such as proton,deuteron, and helium beams, is required for experiments. In this paper, we present the design study of the high intensity RFQ for a deuteron beam with energies from 30 ke V/u to 1.5 MeV/u and currents in the m A range. This system is composed of an Penning Ionization Gauge ion source, short LEBT with a RF deflector, and shared SC Linac. In order to increase acceleration efficiency in a short length with low cost, the 2nd harmonic of 162.5 MHz is applied as the operation frequency in the D^＋RFQ design. The D^＋RFQ is designed with 4.97 m, 1.52 bravery factor. Since it operates with 2nd harmonic frequency, the beam should be 50% of the duty factor while the cavity should be operated in CW mode, to protect the downstream linac system. We focus on avoiding emittance growth by the space-charge effect and optimizing the RFQ to achieve a high transmission and low emittance growth. Both the RFQ beam dynamics study and RFQ cavity design study for two and three dimensions will be discussed.

摘要：目的研究地域、性别、声母类型对我国健康成人发音鼻流量的影响。方法测试北京(男51例、女49例)、上海(男49例、女58例)、广州(男50例、女50例)、重庆(男52例、女60例)共419例健康成人(年龄18~23岁)分别发鼻音/mā/、/nā/、塞音/bā/、/pā/、/dā/、/tā/、/gā/、/kā/、塞擦音/zā/、/zhā/、/cā/、/chā/、擦音/fā/、/sā/、/shā/、/hā/时的平均鼻流量值(mean nasalaue score,MNS);根据发音方式的不同,通过四个三因素混合实验设计进行方差分析,探讨地域、性别、声母类型对MNS的影响。结果我国成人发鼻音、塞音、塞擦音、擦音时的MNS在地域、性别、声母类型主效应上均存在极显著差异(P0.05)。结论地域、性别、声母类型会影响我国健康成人发音鼻流量值,制定MNS参考标准及编制测试语料时,应考虑这些影响因素。

摘要：韩国古典文学史课程不仅是能够让大学朝鲜语专业学生广泛共享韩国(朝鲜)历史、政治、经济、文化、艺术、思想等各种知识的有力途径,更是通过深层次审美体验提高学习者审美素质及审美情感的重要媒介。为此,本文首先分析了韩国古典文学史课程使学习者感到陌生的缘由,即对难懂词汇、文章的困惑;对'古典'及'海外文学'的偏见;对背景知识的理解不足与误解;对传统教学法的反抗心理等。其次以两种教学手段——讲故事与现场体验学习为例,对审美教育中的几种核心要素,即兴、憾、风流等情绪对学习者的影响及其效果进行了分析。

摘要：Superhydrophobic and superhydrophilic surfaces have been extensively inves- tigated due to their importance for industrial applications. It has been reported, however, that superhydrophobic surfaces are very sensitive to heat, ultraviolet （UV） light, and electric potential, which interfere with their long-term durability. In this study, we introduce a novel approach to achieve robust superhydrophobic thin films by designing architecture-defined complex nanostructures. A family of ZnO hollow microspheres with controlled constituent architectures in the morphologies of 1D nanowire networks, 2D nanosheet stacks, and 3D mesoporous nanoball blocks, respectively, was synthesized via a two-step self-assembly approach, where the oligomers or the constituent nanostructures with specially designed structures are first formed from surfactant templates, and then further assembled into complex morphologies by the addition of a second co-surfactant. The thin films composed of two-step synthesized ZnO hollow microspheres with different architectures presented superhydrophobicities with contact angles of 150°-155°, superior to the contact angle of 103° for one-step synthesized ZnO hollow microspheres with smooth and solid surfaces. Moreover, the robust superhydrophobicity was further improved by perfluorinated silane surface modification. The perfluorinated silane treated ZnO hollow microsphere thin films maintained excellent hydrophobicity even after 75 h of UV irradiation. The realization of environmentally durable promising solution for their long-term irradiations. superhydrophobic surfaces provides a service under UV or strong solar light

摘要：近期,伦敦韩裔服装设计师金俊泰(Juntae kim)在同名品牌JUNTAE kim中,展示了一种新兴的设计方式。将一些废弃的工业素材(太阳能板、充电池等)收集起来,巧妙地将科技与服装完美结合,把时装设计成美丽又贴切的功能型运动装。金俊泰试图通过文化上的"杂糅"和形式上的解构,形成充满历史与现代、束缚与自由、高科技与传统手工的设计。

摘要：梳理了大谷光瑞收集品的转移、散落过程,指出早期研究因出土地混乱而缺乏可信度,后经学者对《西域考古图谱》的对照研究,对部分藏品的出土地和主题进行了补充和界定,取得了重要的研究成果。

摘要：In this paper, the nonlinear state feedback controller has been developed to control the pressures of the oxygen and the hydrogen in the PEM（Proton Exchange Membrane） fuel cell system. Nonlinear model of the PEM fuel cell system was introduced to study the design problems of the state observer and model based controller. A cascade observer using the filtering technique was used to estimate the pressure derivatives of the cathode and the anode in the system. In order to estimate the pressures of the cathode and the anode, the sliding mode observer was designed by using these pressure derivatives. To estimate the oxygen pressure and the hydrogen pressure in the system, the nonlinear state observer was designed by using the cathode pressure estimates and the anode it. These results will be very useful to design the state feedback controller. The validity of the proposed observers and the controller has been investigated by using a Lyapunov＇s stability analysis strategy.

摘要：作为约翰•F•肯尼迪(John ***)总统的“活纪念馆”,肯尼迪表演艺术中心在华盛顿特区众多伟大的总统纪念物中占据着重要地位。通过组织举办各类公共活动和对表演艺术活动的支持,肯尼迪艺术中心为公众提供了一个可以跟各领域中富有创造力和想象力的艺术家和表演家零距离沟通互动的机会。表演中心这次的扩建项目名为REACH,由斯蒂文•霍尔建筑事务所主持设计。在原有艺术中心的基础上,项目主要增添了彩排空间和配套的教育空间,还有一系列方便灵活的室内外空间,以进一步巩固肯尼迪艺术中心在艺术文化领域的领导地位。

摘要：作为防水、防腐和地基加固等多种目的和手段之一,灌浆技术可应用于河底隧道或者海底隧道。水泥作为灌浆的主要材料具有强度时间相关特性。可是目前在大部分河底隧道在设计中不考虑水泥的这种强度时间相关特性。据此,提出以弹性波测试方法获得河底隧道施工中预注浆的强度时间相关特性,并采用数值模拟方法将获得的强度时间相关特性用于评价河底隧道的施工。为了获得预注浆区域的强度时间相关特性,进行了弹性波试验。然后把试验获得的预注浆区域的强度时间相关特性用于隧道施工仿真。计算结果表明,预注浆区域的强度时间相关特性不会对河底隧道的安全产生太大的影响。在模拟河底隧道施工时,发现其强度可以使用2～7d的预注浆区域的强度。分析结果也表明,通过强度和刚度的折减可模拟其强度时间相关特性。通过试验和数值模拟相结合的方式,提出预注浆区域的强度时间相关特性对河底隧道影响的方法,可为隧道工程的施工提供参考。