Prediction-based realistic 3D model compression

The benefit of using the geometry image to represent an arbitrary 3D mesh is that the 3D mesh can be re-sampled as a completely regular structure and coded efficiently by common image compression methods. For geometry image-based 3D mesh compression, we need to code the normal-map images while coding geometry images to improve the subjective quality and realistic effects of the reconstructed model. In traditional methods, a geometry image and a normal-map image are coded independently. However a strong correlation exists between these two kinds of images, because both of them are generated from the same 3D mesh and share the same parameterization. In this paper we propose a predictive coding framework, in which the normal-map image is predicted based on the geometric correlation between them. Additionally we utilize the strong geometric correlation among three components of normal-map image to improve the predicting accuracy. The experimental results show the proposed coding framework improves the coding efficiency of normal-map image, meanwhile the realistic effect of a 3D mesh is significantly enhanced.     

支持多种手机客户端的校园信息发布系统

针对数字化校园建设中存在的信息孤岛问题,设计开发了基于客户服务架构的能支持多种手机客户端的校园信息发布系统。分析了系统功能,描述了系统拓扑结构和软件架构,对数据交换接口、网页和手机客户端信息提醒等关键技术进行了探讨。试用结果表明系统运行良好,达到了设计目的。     

Synthesis and Morphology of TiO2 Nanotube Arrays by Anodic Oxidation Using Modified Glycerol-Based Electrolytes

Titanium dioxide (TiO₂) nanotube arrays were prepared by electrochemical anodization of titanium sheets in the glycerol 176 mL/H₂O 44 mL/NH₄F 0.5 wt% electrolytes modified with H₂SO₄ and NaAc addition. The surface morphologies, average inner diameter, and the length of the nanotube arrays changed with the solution pH in the range from 5.6 to 4.0 by adding H₂SO₄. A uniform surface morphology of the nanotubes with average inner diameter of ∼80 nm and a length of ∼1000 nm was obtained when the solution pH was 5.0. The growth rates of the nanotubes were remarkably enhanced by NaAc addition in the range of 0.04–0.14 M . With NaAc addition of 0.10 M , the length of the nanotube arrays reached 4.16 μm after an 8-h anodization, increasing 3.23 μm compared with no NaAc addition. The relationship between solution pH and growth of TiO₂ nanotubes was analyzed by current–time curves, solution electrical conductivities, and scanning electron microscopy (SEM), and the role of NaAc was also discussed based on SEM and solution electrical conductivities.     

Carbon molecular sieve films produced by dc sputtering

This paper reports adsorption measurements that show molecular sieve effects in amorphous hydrogenated carbon (a-C : H) films deposited by d.c. magnetron discharge decomposition of acetylene. Adsorption of organic gases on the films is studied by using a quartz crystal microbalance technique. The sieve effect in this material depends on both deposition and annealing conditions. Films having significant molecular sieve effects are found to be typically microporous and to have a very small characteristic micropore dimension. It is suggested that the d.c. sputtered a-C : H film may be useful as a molecular sieve material in selective adsorption and gas permeation studies.     

一种由WiFi智能插座构成的智能家届

本文首先叙述了智能家居的基本概念以及分析了智能家居中的通信技术,分析了WiFi技术在智能家居中的应用优势。接着讨论了串口WiFi的功能,以WiFi插座为例,描述了串口WiFi在智能家居中的具体应用。最后叙述了基于WiFi技术的智能家居系统。     

基于STM32的步行者航位推算装置设计

基于便携性与实用性考虑,提出一种新的步行者航位推算装置设计。使用三维加速度计与电子罗盘集成芯片LSM303DLHC和陀螺仪集成芯片MPU3050对步行者的实时运动信息进行采集,采用具有ARM Cortex-M3内核的STM32F103RBT6单片机收集传感器数据并对数据进行航位推算处理,将步行者航迹信息显示于TFTLCD上。实验证明,该装置具有较高的推算精度,能满足实际应用需求。     

SPCE061A与AD9851的低频可控信号发生器

基于DDS直接数字频率合成技术原理,采用凌阳SPCE061A单片机作为人机界面控制单元和参数形成处理单元,首先以一片AD9851芯片为核心产生频率在10Hz~30 MHz可调、幅度稳定的正弦波、方波和三角波信号,然后通过一路可控模拟开关(使用AD7502芯片)选择波形输出。再通过外接键盘按键控制输出频率及频率步进,并通过LCD显示输出波类型、频率及电压幅度。该系统除具有基本函数信号发生器的主要功能外,还可控制输出频率在10Hz~1MHz之间变化的波型信号,同时还能够保障输出电平满足Vpp=(0~5V)±0.1V。在输出为50Ω负载的条件下,可实现频率在10Hz~1kHz范围内步进10Hz,在10kHz~1MHz范围内步进1kHz。在实验教学、生产等应用中,有一定的使用和推广价值。     

策应鄱阳湖生态经济区建设 推动吉安进位赶超绿色崛起

建设鄱阳湖生态经济区是国家从战略全局和长远发展出发作出的一项重大决策。如何主动策应鄱阳湖生态经济区建设,推动吉安进位赶超、跨越发展,是摆在我们各级政府和科技部门面前一项亟待解决的问题。为此,一是要提高认识,统一思想,切实增强策应规划的使命感和责任感;二是要结合实际,突出重点,全面对接鄱阳湖生态经济区规划;三是要加强领导,落实措施,确保吉安进位赶超、绿色崛起取得明显成效。     

新自由主义中的政府与市场理论述评

作为凯恩斯主义的反对者,新自由主义以抵制政府干涉,提倡自由市场竞争的面目出现,在一定程度上被看做是对古典自由主义的复辟,但它绝不仅仅是对古典"放任自由"的一种简单继承。对新自由主义主流学派关于政府与市场理论进行考察,理清新自由主义理论思想,从而对其有一个更客观的认识和评价。     

Preparation and characterization of polyelectrolyte copolymers containing methyl methacrylate and 2-hydroxyethyl methacrylate. I. Polymers based on methacrylic acid

Acidic polyelectrolyte copolymers containing 2-hydroxyethyl methacrylate (HEMA), methyl methacrylate (MMA), and methacrylic acid (MAA) were prepared by free radical polymerization to high conversion in solution. Copolymer yields were obtained by gravimetry (all in the 30–50% range), relative molecular weights estimated by intrinsic viscosity measurements (all in the 50–70 cc/g range), tacticity by ¹³C nuclear magnetic resonance (NMR) spectroscopy (all polymers predominantly syndiotactic with some atactic content), and composition by acid/base titrations in conjunction with ¹H-NMR spectroscopy (all close to the monomer charge ratios). Acid strengths or apparent pKa's were examined as a function of extent of ionization. Measurements performed in water indicated that the compact/extended coil transformation in predominantly syndiotactic polymethacrylic acid occurs also in copolymers of similar tacticity containing moderate to high concentrations of MAA. The apparent pKa of such polymers containing only small amounts of MAA did not vary with extent of ionization, indicating a low degree of interaction between the acid groups. In copolymer pairs containing similar amounts of MAA but differing HEMA and MMA contents, the polymer containing more HEMA appeared the stronger acid, presumably due to a better solvation of that polymer which would increase the net spatial charge–charge separation and decrease cooperative effects that lead to suppressed ionization.