Content Analysis of Mobile Phone Advertisement on Beijing News

开始于20世纪90年代中后期的中国手机广告研究大都着力于创意分析与个案总结的思辩性研究，定量研究非常少。偶尔的一两篇定量研究也是集中在媒介投放分析和诉求点等具体某一个点上，相对系统性、实证性的关于手机广告的投放特点、创意表现及趋势变化的研究几乎空白。本文本着“跨年代，多角度”的原则，以等距抽样抽取1996—2004年《北京晚报》的493则手机广告为样本，采用内容分析的方法，对30个可以客观描述而又有参考价值的变量进行了统计分析。研究结果显示，1996年至2003年间，手机报纸广告在绝对数量上增长迅速，2003年后受各种因素的影响，相对增长速度比以前有所减缓。在广告投放上呈现明显的月份、星期差异...Research of Advertisement of mobile phone in china which began in the middle and latter period of 90s in 20th century almost focuses on creative idea analysis and sum-up of one case with little quantitative research. These quantitive researches focus on one point such as media-placing and advertising claiming. There is a space about systemic and positivism features of placing, creative idea and tr...学位：文学硕士院系专业：人文学院新闻传播系_新闻学学号：20033202

花基本结构的多样性及其分子机制

花是被子植物特有的繁殖结构,多样性极为丰富.花在基本结构和其他方面的多样化极大地促进了被子植物的繁盛.近年来,随着进化发育生物学的兴起和蓬勃发展,人们对花基本结构建立和多样化的分子机制有了深入的认识.本文系统总结了花在花器官的类型、花的对称性、花器官的融合、花器官的排列方式和花器官的数目等方面所呈现的多样性及其发育和进化机制,提出将来的研究应该聚焦在"发展新的模式体系"、"利用和开发新技术"和"整合多学科"等方面,以全面揭示花基本结构多样化的根本原因、机制和规律

Audio signal reconstruction based on adaptively selected seed points from laser speckle images

Speckle patterns, present in the laser reflection from an object, reflect the micro-structure of the object where the laser is illuminated on. When the object surface vibrates, the speckle patterns move accordingly, and this movement can be recovered with a high-speed camera system. Due to the low signal to noise ratio (SNR), it is a challenging task to recover the micro-vibration information and reconstruct the audio signal from the captured speckle image sequences fast and effectively. In this paper, we propose a novel method based on pixels' gray value variations in laser speckle patterns to work out with the challenging task. The major contribution of the proposed method relies on using the intensity variations of the adaptively selected seed points to recover the vibration information and the audio signal with a novel model that effectively fuses the multiple seed points' information together. Experiments show that our method not only recovers the vibration information with high quality but is also robust and runs fast. The SNR of the experimental results reach about 20 dB and 10 dB at the detection distances of 10 m and 50 m, respectively. ? 2014 Published by Elsevier B.V

Fast and noninterpolating method for subpixel displacement analysis of digital speckle images using phase shifts of spatial frequency spectra

A fast noninterpolation method for calculating displacement of digital speckle images with subpixel precision was introduced. In this method, the precise displacement is obtained from phase shifts of spatial frequency spectra of two digital speckle images instead of digital correlation calculation. First, digital speckle images before and after displacement are windowed and fast Fourier transform is performed. Then, phase shifts of different spatial frequencies are linearly fitted in spectral space using the least square method, and a coarse displacement value is directly calculated according to the phase shift theorem of Fourier transform. By a window technique and iterative procedure, the influence of finite image size on the accuracy of the results is eliminated, and the accurate displacement is obtained finally. It is significant that the method obtains the subpixel-precision displacement without any interpolation operations. The test results show that the method has high computing efficiency, high precision, and good robustness to low image quality. (C) 2014 Optical Society of Americ

Mathematical Expression and Quantitative Analysis of Impedance Spectrum on the Interface of Glassy Carbon Electrode

玻碳电极（GCE）是各类电化学传感器常用的基础电极,其界面特征直接影响检测性能。本文详细考察了电极体系的电化学过程,针对GCE传感界面,探讨了一个等效电路中电解质电阻、电荷输运电阻、扩散阻抗、电化学（氧化/还原）反应阻抗、表面吸附阻抗和双电层电容等电学元件的物理意义,并给出了对应的数学模型。通过改变模型中5个参数值,模拟了不同状态下的阻抗谱,分析了电极系统各参数对GCE阻抗谱的贡献规律。最后,采用该数学模型对裸GCE和修饰GCE在铁氰化钾溶液中的阻抗谱进行分析,拟合结果与实验数据吻合度高;基于拟合获得参数,定量对比分析了修饰前后电极表面的特征变化。Glassy carbon electrode (GCE) is a common basic electrode for various electrochemical sensors, and the detection properties are determined by its interfacial characteristics. In this paper, we established an equivalent circuit including electrolyte resistance (Rel), charge transport resistance (Rct), diffusion impedance (Rdi, Cdi), electrochemical (oxidation/reduction) reaction impedance (RR, CR), surface adsorption impedance (Rads , Cads), double-layer capacitance (CDL), and derived the mathematical expression for the equivalent circuit. The Rel and CDL are contributed by inactive ions in electrolyte to produce non-faradaic impedance, while the Rct and RR are contributed by the active ions of redox reaction in electrolyte to produce faradaic impedance. The Rct directly corresponds to the electrode potential (E) of the reaction, which represents the difficulty of electrode reaction. When the potential E is the only state variable in the impedance spectrum of electrode reaction, that is, there is only one time constant in the impedance spectrum, the Rct can represent the whole Faraday impedance of the system. However, when the electrode reaction is also affected by other variables such as diffusion, surface film or surface adsorption ion coverage, the Faraday impedance of the system also includes the impedance produced by the diffusion impedance and the changes of the surface film (RR, CR) and the coverage of the surface absorbed ions caused by electrochemical reaction (Rads, Cads). The impedance spectrum of the electrode system in different states were simulated by changing the five parameters of the mathematical expression. The contribution of different factors to the impedance spectrum of GCE was revealed. Finally, the impedance spectra of bare/modified GCE in potassium ferricyanide solution were analyzed by the mathematical model. The fitting results are in good agreement with the experimental data. Based on the parameters obtained by fitting, the changes of the electrode surface characteristic before and after modifications were quantitatively compared and analyzed. The charge transport resistance increases from 5827.8 Ω to 25104.3 Ω, and the diffusion conductance of Fe3+/Fe2+ ions on the electrode surface also increases by an order of magnitude. However, there is no significant difference with the double-layer capacitance and the frequency dispersion coefficient. The surface of the modified electrode remains electrically neutral. The aggregation state and oxidation-reduction mechanism of Fe3+/Fe2+ on the electrode surface are the same as those on the bare GCE surface.国家自然科学基金重点项目(21431001);广西自然科学基金(2020GXNSFBA297001)通讯作者:程蕾E-mail:[email protected]:LeiChengE-mail:[email protected]广西师范大学化学与药学学院,省部共建药用资源化学与药物分子工程国家重点实验室,广西 桂林 541004State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmaceutical Science, Guangxi Normal University, Guilin 541004, Guangxi, Chin

全球季风动力学与气候变化

本文结合现代季风和古季风研究成果对全球季风进行了一个全面回顾，并引入了一个 全球季风的新定义，该定义考虑了三维分布、终极成因，强调了季节性气压梯度变化对季风环 流的影响，并同时使用了环流与降水来描述季风强度。我们在从构造到季节内的宽广时间尺度 上来考察全球季风气候变化。全球季风的性质包括全球不均一性、区域差异性、季节性、准周 期性、不规则性、不稳定性和穿时性。对全球季风动力学来说，太阳辐射、地球轨道参数、下 垫面性质和海 - 陆 - 气相互作用十分重要。本文还讨论了季风变率在不同时间尺度上的主要驱动 因子以及多时间尺度之间的动力学关系。自然过程与人类活动影响对我们理解未来全球季风行 为都非常重要。</p

绿色农业新技术集成研究与示范

一、该项目针对农业生产中食品安全和环境污染问题,开展了S-诱抗素、新奥霉素、壳寡糖、棉铃虫病毒杀虫剂与昆虫病原线虫生物制剂、功能性堆肥及其浸提液工业化生产等的试验和示范,立项准确,针对性强,意义重大。 二、项目研究出S-诱抗素等生物制剂及其生产工艺、工厂化技术;研究开发出昆虫病原线虫活体繁殖技术,实现了工厂化生产;研究开发了两种功能性堆肥及浸提液,提出了“功能性堆肥+秸秆生物反应堆+堆肥浸提液+S-诱抗素等生物制剂”健康、安全设施蔬菜生产模式;在宁夏实现了地上、地下,土壤、作物生物制剂联防技术体系,为低耗、高效、安全、健康农产品生产开辟了新途径。 三、在S-诱抗素、新奥霉素高产菌株的生产工艺,昆虫病原线虫活体繁殖工厂化生产方面取得了新突破;在S-诱抗素、新奥霉素、壳寡糖、棉铃虫病毒杀虫剂、功能性堆肥及其浸提液集成应用控制作物病虫害等方面有创新。研究成果达到了国内先进水平,S-诱抗素、新奥霉素高产菌株的生产工艺研究达到国际领先。 四、项目执行期间,在宁夏15个市县建立核心试验基地14个,示范推广点40个,累计推广面积17万亩,新增效益9600万元。获得发明专利4项,实用新型专利1项,制定地方标准5项,专著1部,发表论文19篇(其中SCI收录6篇)。培训农技人员300人次,农民4700多人次