谈中小城市户外广告规划

随着乡镇城市化、城市现代化进程的加快,国内一些中小城市开始着手进行城市户外广告的规划设计。根据广告法的基本规定及广告设计的原则,提出了中小城市户外广告规划应遵循的基本原则,作了简要地分析。     

一种基于H.264/AVC的快速运动估计算法

针对H．264／AVC视频编码标准中的多种块模式运动估计特点,提出了一种新的运动估计算法。该算法包括整像素和亚像素搜索的非对称混合菱形网格搜索法（UDiamondGS,unsymmetrical diamond grading integer pixel search）和分层的矢量偏移算法（HVBFDS,hierarchical vector biased fractional pixel search）,通过同Joint Video Team（JVT）提供的JM85进行验证和比较表明,该算法在保持编码器原有的失真度特性的同时,可显著提高编码器编码速度16～20倍。     

Efficient fluorescent white organic light-emitting devices based on a ultrathin 5,6,11,12-tetraphenylnaphthacene layer

White organic light-emitting devices (OLEDs) were fabricated using a ultrathin layer 5,6,11,12-tetraphenylnaphthacene as the yellow light-emitting layer and p-bis(p-N,N-diphenyl-aminostyryl)benzene (DSA-ph) doped in 2-methyl-9,10-di(2-naphthyl)anthracene (MADN) matrix as the blue light-emitting layer. The thickness of rubrene ultrathin layer will seriously affect the device performance, and the device with 1 nm rubrene achieves the best performance, with the maximum luminance of 33,152 cd/m² at 11 V and the maximum current efficiency of 8.69 cd/A at 7 V.     

水源水生物预处理除氨的研究与应用

生物预处理是去除微污染源水中氨氮的一种经济有效的方法。该文总结了近年来我国在这一方面的工程及研究现状，探讨了其影响因素。     

The measurement of magneto-optical Kerr effect of ultrathin films in a pulsed magnetic field

A Kerr rotation measurement system in a pulsed magnetic field (up to 11 T) was built to study magnetic properties of several ultrathin films. Our result shows that the Kerr rotation angle increases with the increasing wavelength of the incident light, while the difference between the spectras of Fe and CoFeAl is attributed to plasma resonance. We also studied the dynamic properties of the magnetic films: while ferromagnetic materials (Fe, CoFeAl, MnAs and CoMnAl) show quasi-static behavior in the time-scale of a few 100 μs, diamagnetic material GaAs shows time-dependent hysteresis.     

多级安全数据模型的数据紧凑度研究

多级安全数据模型的研究重点主要集中在模型的安全性和表达能力上,对数据模型的效率关注不够。本文尝试从一个新的角度――数据紧凑度对数据模型进行分析和比较,对于多级安全数据模型的改进和实现具有一定的指导意义。     

DEVELOPMENT OF EXPRESSION TYPE DECANTER AND ITS APPLICATION IN ENVIRONMENTAL PROTECTION

The principle of intensified dewatering with expression-type decanter is analyzed, the factors affecting dewatering of expression-type decanter are studied and the structural features of expression-type decanter are introduced. It is proven through the sludge dewatering experiments in the municipal sewage treatment factories of different regions that this expression-type decanter developed can satisfy the technical requirements of sludge dewatering in municipal sewage treatment     

Preparation and Performance of Salt Tolerance and Thermal Stability Cellulose Nanofibril Hydrogels and Their Application in Drilling Engineering

The poor salt tolerance, thermal stability, and environmental performance of petrochemicals can severely limit their applications in drilling engineering. In this study, cellulose nanofibril (CNF) hydrogels with improved salt tolerance and thermal stability were prepared, and their filtration performance was evaluated. The hydrogels were prepared through the simultaneous grafting of 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and butyl acrylate (BA) onto the CNF surface through ceric ammonium-nitrate-induced radical polymerization. The modified and original CNF samples were characterized using Fourier Transform infrared spectroscopy (FT-IR) and rheological measurements. The FT-IR analysis results showed that both AMPS and BA were grafted onto the CNF backbone, affirming the successful preparation of the grafted CNFs. The rheological analysis results showed that the modified CNF hydrogels exhibited significantly improved salt tolerance, thermal stability, and “salt-thickening” effect. Moreover, the results of the fluid loss test showed that the modified CNF hydrogels exhibited a much better fluid loss control than the original CNF hydrogels. In addition, after adding 2% modified CNF hydrogels as a filtrate reducer in the drilling fluids prepared with a 6% combined salt solution, the filtrate loss was significantly reduced even after aging for 72 h at 160℃.     

影响严寒地区体育馆低能耗设计的建筑特征要素研究

严寒地区体育馆建筑能耗巨大,对其进行建筑低能耗设计研究十分必要。由于体育馆建筑独特的建筑功能及建筑形态,使得其低能耗建筑设计与其他建筑类型有着极大的区别。本论文旨在分析研究严寒地区体育馆建筑特征对低能耗设计的影响．为严寒地区体育馆低能耗设计打下基础,有助于建立并完善建筑低能耗设计研究的理论框架,为今后不同地域、不同建筑类型的低能耗设计研究提供理论依据。影响严寒地区体育馆低能耗设计的建筑特征要素有：比赛空间尺度的巨大化,室内物理环境的特殊化及体育经营模式的多样化。     

All fluorescent and high color rendering index white organic light-emitting devices with improved color stability at high brightness

We have demonstrated high color rendering index (CRI) white organic light-emitting devices using a multilayer structure based on all fluorescent emitters. The CRI of white light can be easily tuned by adjusting the thickness of the blue emitting layer (B-EML). In particular, the device with 8-nm-thick B-EML obtains very high CRI values (91-92) over a wide range of luminance (4000-23,000 cd/m²). Furthermore, the Commission Internationale De L'Eclairage coordinates of the device is rather stable and the variation is only (± 0.005, ± 0.003) over 4000-23,000 cd/m². The values are very close to white light equivalent energy point of (0.333, 0.333). We attribute these unique performances to the competition of the two mechanisms of the carrier trapping of the red dopant and efficient förster energy transfer in the blue emitting layer.