聚智凝力 建设岷江干旱河谷绿色长廊——推进生态文明建设 打造美丽茂县

这里有享誉中外的世界自然遗产一九寨沟,这里是长江黄河上游重要水源涵养地,这里是青藏高原生态屏障的重要组成部分,这里被世界旅游专家誉为＂世界生态旅游最佳目的地＂……这里,就是位于四川西北部、川青甘三省交界处的阿坝藏族羌族自治州。

唱出亚洲强音——访《亚洲雄风》词作者张藜

宏大的气势,脍炙人口的歌词,雄浑强劲的音响——《亚洲雄风》在北京回荡。日前,在亚洲专号磁带发布会后,我们采访了《亚洲雄风》的词作者。

Statistical Algorithm for Damage Detection of Concrete Beams Based on Piezoelectric Smart Aggregate

The functional piezoelectric ceramic smart aggregate(SA) sensors and actuators,based on piezoelectric ceramic materials such as lead zirconium titanate(PZT),were embedded into the reinforced concrete beams with three-point bending under static loading for purposes of damage detection.The SA actuators generated the desired sine sweep excitation signals online and the SA sensors received and detected real-time signals before and after damage.The wavelet analysis and statistical characteristics about damage signals were used as a signal processing and analysis tool to extract the optimal damage information and establish a statistical damage detection algorithm.The damage index-based wavelet analysis and damage probability-based probability and statistics were proposed by PZT wavebased theory and active health monitoring technology.The results showed that the existence of cracks inside largely attenuated the amplitude of active monitoring signal after the damage of beam and the attenuation was related to the severity degree of damage.The innovative statistical algorithm of damage pattern detection based PZT-SA can effectively determine damage probability and damage degree,and provide a prediction for the critical damage location of reinforced concrete structures.The developed method can be utilized for the structural health comprehensive monitoring and damage detection on line of various large-scale concrete structures.

Swelling properties and molecular simulation of PNIPA porous hydrogels

A series of porous intelligent hydrogels, which exhibited appropriate lower critical solution temperature (LCST) and fast response behavior, were synthesized by radiation method. The structure and surface morphology of hydrogels were examined by the infrared radiation and the scanning electron microscopy, respectively. The influences of the content of crosslinking agent and relative molecular mass of polyethylene glycol (PEG) on the swelling properties of hydrogels were discussed. The molecular mechanics simulations were performed to investigate the phase transformation mechanism of poly(N-isopropyl acrylamide) (PNIPA) hydrogel. The results show that macropores are observed in hydrogels, whereas hydrogels prepared without using PEG have a dense surface. LCST of hydrogels increases with the increase of relative molecular mass of PEG. The swelling mechanism of PNIPA porous hydrogels follows non-Fickian diffusion model. The theoretical maximum water absorption S∞ is approximately consistent with experimental value according to the second-order kinetics model established by Schott. The molecule chains of PNIPA hydrogel begin folding and curling, resulting in volume shrinkage at 305 K. There are much intramolecular nonbonding interactions in molecule chains of hydrogels. The porous hydrogels are expected to be applied in the field of artificial intelligence material.

Intelligent compaction theory of high roller compacted concrete dam

The concept and realization process of intelligent compaction for the construction of high roller compacted concrete dam were presented, as well as the theory of monitoring and intelligent feedback control. Based on the real-time analysis of the compaction index, a multiple regression model of the dam compactness was established and a realime estimation method of compaction quality for the entire work area of roller compacted concrete dam was proposed finally. The adaptive adjustment of the roiling process parameters was achieved, with the speed, the exciting force, the roller pass and the compaction thickness meeting the standards during the whole construction process. As a result, the compaction quality and construction efficiency can be improved. The research provides a new way for the construction quality control of roller compacted concrete dam.

Research on Polymer Materials in Bio Medical and Its Application

Intelligent hydrogels is as drug carrier, and it has a good application prospect. There are some changes factors in the human environment, such as temperature, pH. Therefore, the temperature sensitive hydrogels and pH sensitive hydrogels can release system for drugs in the body. So the paper detailed descript a novel MWCNTs good dispersion of PMAA/MWCNTs nano hybrid hydrogels. The introduction of MWCNTs significantly increased the hydrogel pH response and mechanical strength, and depends on the MWCNTs component ratio, particle size and concentration of cross-linking agent. The study found, swelling rate of hybrid hydrogels was faster than the pure PMAA hydrogel, and the swelling behavior were explained. The compression stress-strain experiments should be found, MWCNTs load transfer plays an important role in improving the mechanical properties of the hybrid hydrogels network compression.

我心微笑

自1979年新中国恢复广告业以来,我便开始从事电视广告经营工作。那时,没有人能够告诉我广告是什么,应该怎么做,也没有一本能够指引我前行的广告专业书籍,几十万广告人,一个百废待兴的行业在懵懵懂懂中前行。后来,随着行业的突飞猛进的发展,陆陆续续地有了一些浅薄的广告理论方面的书籍。随着广告实务界的理念和操作水平的提高,有了一些很好的案例,在21世纪初,也有了一些不错的案例书籍,但相对而言,或是某个大公司的案例集锦,或是某一行业的几个精彩案例,规模上难免单薄些。《广告人·中国·案例丛书》的出版,可以说是2005年中国广告业的第一件大事,将当之无愧地被载入当代中国广告史。一套300多个经典案例,

凝智聚力抓改革 多措并举促发展——中共渠县县委党校行政后勤改革的实践探索

近年来,中共渠县县委党校以党的十七大精神为指导,深入贯彻落实科学发展观,始终坚持"改革兴校、发展强校"的办学理念,立足实际,以着眼战略全局、服务发展大局为目标,创新发展机制,改革落后体制,进行了一场大刀阔斧的行政后勤工作改革,取得了一定成效,实现了党校行政后勤工作的整体推进和全面跃升,有力地推进了渠县党校干部教育事业的大发展。

购买电脑当心落入商家“骗销”陷阱

现如今,电脑更新换代速度快,型号、配置名目繁多,专业性强,一些电脑销售商便趁机下手、玩弄花招,引得消费者上当。他们惯用的手法是:第一步,谎称消费者想要购买的电脑型号缺货,或者说配置不佳;第二步,推荐所谓的性价比高或配置性能更好的电脑;第三步,迅速成交。

An intelligent light-managing ionic skin for UV-protection,IR stealth,and optical camouflaged Morse codes

Ionic skins that demonstrate great advantages in the mechanical properties and multiple sensory capabilities are regarded as an attractive candidate to mimic functions of human skin.However,human skin is vulnerable to be damaged under long-time sunlight irradiation,and most of the current ionic skins also lack a protection against harmful ultraviolet and infrared lights.Herein,this work develops a multifunctional ionic skin based on ionic conductive and light-managing hydrogels via a facile one-step locally confined polymerization.It is mechanically adaptable,able to modulate light in the broadband solar spectrum,and protect human skin from the harmful ultraviolet and infrared lights.Moreover,without complicated processing,the ionic skin enables human-machine interactions via wireless and optical camouflaged Morse codes.We believe this work will promote the development of smart wearable devices with multiple customizable functions.

A smart hydrogel for on-demand delivery of antibiotics and efficient eradication of biofilms

Biofilm-associated infections are difficult to treat in the clinics because the bacteria embedded in biofilm are ten to thousand times more resistant to traditional antibiotics than planktonic ones.Here,a smart hydrogel comprised of aminoglycoside antibiotics,pectinase,and oxidized dextran was developed to treat local biofilm-associated infections.The primary amines on aminoglycosides and pectinase were reacted with aldehyde groups on oxidized dextran via a pH-sensitive Schiff base linkage to form the hydrogel.Upon bacterial infection,the increased acidity triggers the release of both pectinase and aminoglycoside antibiotics.The released pectinase efficiently degrades extracellular polysaccharides surrounding the bacteria in biofilm,and thus greatly sensitizes the bacteria to aminoglycosides.The smart hydrogel efficiently eradicated biofilms and killed the embedded bacteria both in vitro and in vivo.This study provides a promising strategy for the treatment of biofilm-associated infections.