Preparation of AIN thin films for film bulk acoustic resonator application by radio frequency sputtering

Aluminum nitride (AIN) thin films with high c-axis orientation have been prepared on a glass substrate with an A1bottom electrode by radio frequency (RF) reactive magnetron sputtering. Based on the analysis of Berg's hysteresis model, the improved sputtering system is realized without a hysteresis effect. A new control method for rapidly depositing highly c-axis oriented AIN thin films is proposed. The N2 concentration could be controlled by observing the changes in cathode voltage, to realize the optimum processing condition where the target could be fixed stably in the transition region, and both stoichiometric film composition and a high deposition rate could be obtained. Under a 500 W RF power of a target with a 6 cm diameter, a substrate temperature of 450 ℃, a target-substrate distance of 60 mm and a N2 concentration of 25%, AIN thin film with prefer-ential (002) orientation was deposited at 2.3 μm/h which is a much higher rate than previously achieved. Through X-ray diffraction (XRD) analysis, the full width at half maximum (FWHM) of AIN (002) was shown to be about 0.28°, which shows the good crystallinity and crystal orientation of AIN thin film. With other parameters held constant, any increase or decrease in N2 con-centration results in an increase in the FWHM of AIN.     

学习实践科学发展观 健全完善体制机制 推动现代林业又好又快发展——中共国家林业局党校第三十三期党员领导干部进修班赴江西省教学考察报告

2008年11月21—29日,中共国家林业局党校第33期党员领导干部进修班全体学员赴江西省开展了教学考察和林业工作调研。这次教学考察和林业工作调研的收获和体会包括抓住学习实践科学发展观的机遇,着力推动林业再上新台阶;坚持弘扬江西林改精神,着力推进集体林权制度改革进程;贯彻落实十七届三中全会精神,着力完善集体林权制度改革政策措施等六个方面。     

双模腔中利用循环跃迁的人工原子实现频率转换

在双模腔中,利用循环布局跃迁的人工原子,给出了实现腔模场频率上转换和下转换的方案.其中,腔模和经典场与三能级人工原子的相互作用都是共振耦合.因此,系统的量子动力学操作处于较高的速度进行.从抑制退相干的角度看,这是非常有意义的.结果表明,制备人工原子在某个初态,可以实现腔模频率上转换和下转换操作.最后,简单说明了从腔模场的任意初态可产生双模压缩态.     

变频器谐波的产生与抑制措施

从变频器的内部结构入手,分析了变频器谐波产生的原因和危害,对目前解决谐波问题的措施作了全面的分析,提出了抑制谐波的可行方案.     

科学发展观的马克思实践历史观解读

中国共产党人的科学发展观,浓缩了中国改革开放30年以来社会发展领域中正反两方面的经验教训,马克思的实践历史观是科学发展观的哲学基础。实践历史观的实践视角与科学发展观的以人为本,它的实践的社会时空结构观与科学发展观的全面协调可持续的发展,它的发展理想与科学发展观的发展理想,均具有深刻的内在统一性,由之构成对科学发展观的马克思实践历史观的解读。深入理解马克思实践历史观与科学发展观的内在统一性,对于推进我国社会主义现代化建设具有十分重要的理论意义和现实意义。     

中国现代文学中的绿色观念

中国现代文学中的绿色观念体现为作家对人类赖以生存的大自然的诗意描摹和审美观照,强调天人合一、同生共荣、互养互惠的亲和关系,以及对现代工业文明的反思和批判;它既是对中国传统文化中丰富的生态思想资源继承的结果,同时又彰显出接受西方现代精神文明及人类终极关怀意识的现代特质;它虽不是自觉的现代生态伦理思想,但却透露出一种难能可贵的生命整体意识,而这恰恰孕育着中国现代生态伦理思想的萌芽。     

From arithmetical thought to algebraic thought: The role of the “variable”

The introduction of the concept of the variable represents a critical point in the arithmetic–algebraic transition. This concept is complex because it is used with different meanings in different situations. Its management depends on the particular way of using it in problem-solving. The aim of this paper was to analyse whether the notion of “unknown” interferes with the interpretation of the variable “in functional relation” and the kinds of languages used by the students in problem-solving. We also wanted to study the concept of the variable in the process of translation from algebraic language into natural language. We present two experimental studies. In the first one, we administered a questionnaire to 111 students aged 16–19 years. Drawing on the conclusions of this research we carried out the second study with two pairs of students aged 16–17 years.

我国高校科研管理中人本理念的思考

科学研究是高校的三大职能之一,而一所高校的科研实力很大程度上取决于该校科研管理能力的高低。随着经济文化的全球化．高等教育管理与世界接轨的要求促使了高校科研管理部门加快了对科研管理的改革和创新,其中以人为本的管理理念逐渐受到管理者们的重视。笔者认为对科研人员进行有效激励、沟通服务,并重视对其引导是科研人本管理的核心内容,本文将对这三方面问题进行思考．对人本理念的应用和科研管理能力提高问的关系提出一点见解。     

Anticipated IT infrastructure and supply chain integration capabilities for RFID and their associated deployment outcomes

This study looks at the perceived ability of components of IT infrastructure integration and supply chain process integration to predict specific radio frequency identification (RFID) system deployment outcomes—exploration, exploitation, operational efficiency, and market knowledge creation. Data for this pilot research study was collected using a survey questionnaire administered online to members of the Council of Supply Chain Management Professionals (CSCMP). It was hypothesized that data consistency and cross-functional application integration, both elements constituting IT infrastructure integration, and information flow integration, physical flow integration, and financial flow integration, all elements constituting supply chain process integration would be positively associated with and predict the four RFID system outcomes. Multiple regression results show partial support for all four proposed hypotheses. Cross-functional application integration and financial flow integration predicted exploration, while data consistency and physical flow integration predicted exploitation. Data consistency and cross-functional application integration, on the other hand, predicted both operational efficiency and market knowledge creation. Supply chain managers planning to deploy RFID systems are alerted to the criticality of these IT infrastructure issues as they brace for a likely widespread implementation of RFID in supply chains they participate in.     

基于中频采样的星载合成孔径雷达的数据处理

研究了基于中频采样的星载合成孔径雷达(synthetic aperture RADAR, SAR)数据处理技术及其FPGA实现. 常规星载SAR系统对模拟解调后的视频数据进行采样,然后对数据进行压缩和格式化处理并下传. 采用中频采样技术实现星载SAR数据的正交解调和处理,对数字正交解调算法和合成孔径雷达BAQ压缩算法进行分析,完成FPGA的硬件设计和仿真. 结果表明,基于FPGA实现星载SAR中频采样的数据处理方法可行. 与传统模拟方法相比,中频采样系统性能和可靠性都有提高,是未来星载SAR数据处理的发展趋势.