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2006年8月21日至28日,中国造船工程学会船舶仪器仪表学术委员会等在湖北省宜昌市举办“水声新技术学术讲座”。上海市声学学会水声分会组织了7名青年科技人员前往听课。杭州应用声学研究所宫先仪院士主讲了《浅海波导中的声信号时空处理》,上海船舶电子设备研究所姚蓝教授主讲了《水声对抗技术》,哈尔滨工程大学田坦教授主讲了《水声定位导航技术》。全国各地水声单位共有70余名科技工作者参加了讲座。由于主讲人所选内容均为当前水声领域的前沿技术,备课又比较充分,所以受到了年轻科技工作者的欢迎和较高评价。 相似文献
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为进一步活跃学术研究氛围、建立良好学术环境、加强专业技术交流、提高科学研究的水平,从今年8月起,中国标准化研究院开始举办"标准化大讲堂"活动,定期邀请院内外著名专家、研究人员就标准化的前沿问题进行学术讲座。本刊为此同步推出《标准大讲堂》专栏,就这些讲座内容进行摘编整理,以飧广大读者。 8月19日,首场"标准化大讲堂"学术讲座在中国标准化研究院多功能厅内隆重开讲。作为首场报告,院长王忠敏旁征博引,源据古今,为全院职工进行了题为"关于标准和标准化"的专题演讲。整场报告的内容深入浅出,从"生活中的标准化"出发,通过大量富有新意的图片和史料追溯和展示了"标准和标准化"的历史和发展、作用及其和法律的关系。 相似文献
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一年一度的新生入学教育讲座,对于学生了解自己,熟悉专业,了解专业课程结构,明确学习目的与目标,巩固专业思想,注意学习方法,提高学习效率,都具有重要的意义。因此,对讲座内容的设计应引起足够的重视。 相似文献
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GB/T19000-ISO9000标准质量认证讲座,在中国计量器具质量认证咨询中心积极配合下,在泰山衡器股份有限公司热情支持下,已经刊出了十一期,本文是这一讲座的最后一期。在总结本讲座时,有必要再次强调,为什么在(中国计量)杂志上要宣传学习ISOWXX)标准和质量认证知识,在推行I明叫王0标准和质量认证工作中企业计量工作的作用和地位,以便从中探索新的形势下企业计量工作的方向和任务。“以质量为中心,标准化、计量为基础”是我国技术监督工作的基本方针。今年年初国家技术监督局李传卿局长提出对今后一个时期的计量工作明确其… 相似文献
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目前,为充分发挥电影院总体效益,利用影厅资源进行多种经营,承接会议租场、学术讲座、多媒体教学、新闻发布等情况日益频繁。为此,配备会议扩声系统成为一些影院的当务之急。本文介绍一种投资较小的扩声方案,能满足要求不高的大型会议。 相似文献
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专业音响实用知识讲座(一)施又麟在进人本讲座的正式内容之前,首先要弄清一个概念,即什么是专业音响?对于这个讲座来说,音响是指非家用的、经过必要的技术手段处理后能满足各种不同具体需要的。高质量的音频扩音系统(不含专业化的录音系统)。由于社会的进步和国民... 相似文献
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利用双波长比值光谱法测定苯二酚异构体的含量。依据邻、间、对苯二酚三组分的比值光谱特征,以对苯二酚为参比组分,选择224nm、277nm作为测定邻苯二酚的波长;以邻苯二酚作为参比组分,选择231nm、284nm作为测定间苯二酚的波长;以间苯二酚作为参比组分,选择220nm、231nm作为测定对苯二酚的波长,测定邻、间、对苯二酚混合样品中三组分含量。邻苯二酚在0.5mg/L~80mg/L,间苯二酚在0.3mg/L~120mg/L,对苯二酚0.4mg/L~80mg/L浓度范围内线性关系良好,平均回收率分别为99.2%,102.8%和101.7%。该方法具有测定波长少、光谱"分离"能力强、计算简单、易于推广等特点。 相似文献
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Electrical properties of refrigerants are of importance as soon as bushings are surrounded by a refrigerant. This is the case e. g. for hermetic sealed motor compressors as well as for some control devices such as liquid level control units or capacity controls for compressors. This paper presents a survey of existing data for HFC refrigerants and presents new measurements for those HFC blends that have been identified as long term replacements for CFCs and HCFCs. The data collection includes permittivity, electrical conductivity and breakdown voltage. Values are given for the HFC blends R404A, R407C, R410A and R507 as well as for R134a. 相似文献
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以苯乙烯为主单体,丙烯酸为功能单体,二乙烯基苯(DVB)为交联剂,偶氮二异丁腈为引发剂,乙腈和甲苯为溶剂,采用回流沉淀聚合法合成了单分散羧基化交联聚苯乙烯微球;然后以1,2-二氯乙烷为溶胀剂,二甲氧基甲烷为外交联剂,在三氯化铁的催化下发生傅-克超交联反应,实现微孔化。采用傅里叶变换红外光谱、扫描电子显微镜、激光粒度及Zeta电位、比表面积及孔隙分析对微球结构进行了表征。结果表明,通过实验可以得到具有良好球形形貌和单分散性的交联微孔聚苯乙烯微球;随着丙烯酸含量增加,交联微球的带电量增加;随着DVB含量的增加,实现了微孔化且比表面积呈上升趋势,其中当DVB用量为60%时,其比表面积达到606.06 m2/g。 相似文献
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Gillian Collins Eileen Armstrong David McNulty Sally O’Hanlon Hugh Geaney 《Science and Technology of Advanced Materials》2016,17(1):563-582
This perspective reviews recent advances in inverse opal structures, how they have been developed, studied and applied as catalysts, catalyst support materials, as electrode materials for batteries, water splitting applications, solar-to-fuel conversion and electrochromics, and finally as photonic photocatalysts and photoelectrocatalysts. Throughout, we detail some of the salient optical characteristics that underpin recent results and form the basis for light-matter interactions that span electrochemical energy conversion systems as well as photocatalytic systems. Strategies for using 2D as well as 3D structures, ordered macroporous materials such as inverse opals are summarized and recent work on plasmonic–photonic coupling in metal nanoparticle-infiltrated wide band gap inverse opals for enhanced photoelectrochemistry are provided. 相似文献
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Jon Plaut Author vitae 《Technology in Society》1998,20(4):469-479
This paper discusses systems of good environmental management, adopted by industry, which go beyond (rather than replace) compliance with laws and regulations, as part of the quality revolution impacting both global and local companies and plants. From environmental auditing to environmental management systems, industry is increasingly focusing not just on compliance with laws—as important as that might be—but on continuous improvement in environmental practices as a marketplace demand. Movement has occurred in three directions: towards (1) enforcement strategies, (2) trade relations, including environmental cooperation, and (3) marketing of diligence as an attractive asset in environmental conduct. Consequently, the responsible green approach is also developing rapidly. That approach among management systems should be encouraged by industry, governments, environmental groups, and the public as a positive process that enhances sustainability as well as giving a competitive edge to local economies. Mexico's embrace of good environmental management as it responsibly develops is exemplary for, and evidence of, its leadership of other Latin American countries, and for other countries, such as China, that are making strides in achieving growth and environmental safeguards. 相似文献
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Recent advances in the exploitation of localized surface plasmons (charge density oscillations confined to metallic nanoparticles and nanostructures) in nanoscale optics and photonics, as well as in the construction of sensors and biosensors, are reviewed here. In particular, subsequent to brief surveys of the most‐commonly used methods of preparation and arraying of materials with localized surface plasmon resonance (LSPR), and of the optical manifestations of LSPR, attention will be focused on the exploitation of metallic nanostructures as waveguides; as optical transmission, information storage, and nanophotonic devices; as switches; as resonant light scatterers (employed in the different near‐field scanning optical microscopies); and finally as sensors and biosensors. 相似文献