TiO_2光催化氧化脱除氮氧化物研究进展(Ⅱ)

目前,我国的环境污染已经日趋严重,其中氮氧化物是主要的有害物质.本文主要介绍了TiO2光催化剂催化氧化原理,TiO2光催化剂的改造,TiO2光催化剂脱NOx除氮氧化物的见解以及脱除技术展望.     

纳米LaCoO_3的制备及其应用研究

本文采用共沉淀法和柠檬酸络合法的方法制备了系列纳米钙钛矿型 LaCoO3光催化剂,较系统地研究了纳米钙钛矿型ABO,复合氧化物A、B位部分掺杂复合氧化物(A位掺杂Ca,B位掺杂Cu)的光催化氧化性能,并考察不同制备方法对LaCoO3光催化活性的影响.最终对样品进行了降解酸性红3B染料性能测试和对大肠杆菌的抗菌试验,结果表明柠檬酸络合法制备的光催化剂的光催化活性与抗菌活性比固相研磨法制备的光催化剂的高,并且掺入少量杂原子后,光催化剂的光催化活性与抗菌活性均提高.     

Fe/TiO_2/酸改性土催化剂制备及可见光性能研究

以TiOSO4为钛源,Fe(NO3)3为铁掺杂剂,H2SO4改性煅烧高岭土为载体,采用沉淀法制备Fe/TiO2/酸改性高岭土催化剂,用SEM、XRD、吡啶-IR、UV-vis方法对所制得的催化剂进行表征,并以草酸为目标降解物考察催化剂在可见光下的光催化性能。结果表明:铁的掺杂有利于样品对紫外光强烈吸收并发生红移,而酸改性增加了载体孔道同时也提高了催化剂对可见光的吸收。当铁的掺杂量为2wt%,H2SO4改性浓度为20%时,所制得的催化剂活性最好,草酸降解率高达80%。     

TiO2光催化氧化脱除氮氧化物研究进展(Ⅰ)

目前,我国的环境污染已经日趋严重,其中氮氧化物是主要的有害物质。本文主要介绍了TiO_2光催化剂催化氧化原理,TiO_2光催化剂的改造,TiO_2光催化剂脱NOx除氮氧化物的见解以及脱除技术展望。     

绿色荧光蛋白在现代生物学研究中的应用

绿色荧光蛋白(cfp)是源于海洋生物多管水母体内的一种发光蛋白,这种蛋白结构很特殊,在蓝光或紫外光激发下可以发射绿色荧光.适合用作普通的报告标记,尤其适合于活体细胞或组织.gfp基因能在活细胞内稳定表达,被广泛应用于现代生物学的各个领域.     

结合色彩空间的林火识别方法研究

分析基于红外辐射的林火识别原理,提出利用可见光图像的色彩空间数据作为红外数据的补充,扩展林火识别的信源输入,进而提高可用信息量,最终提高林火识别准确率的方法,考虑到林林火害的突发性以及识别的高时效性需求,对于可见光图像的处理采用简单有效的技术路线,实验表明,该方法能够有效提取可见光图像中的火焰信息,能够作为红外林火识别系统的有效补充。     

专利信息

无机化工大颗粒表面负载纳米晶二氧化钛光催化剂的制备方法公开号　CN 14 0 84 73A　　公开日　 2 0 0 3.4 .9申请人　清华大学摘　要　本发明涉及一种大颗粒表面负载纳米晶二氧化钛光催化剂的制备方法 ,首先以钛酸正丁酯为前驱体制备过渡层溶胶 ,制备以钛酸正丁酯为前驱体的活     

第二代进杭农民工社会融入相关状况调查研究

改革开放30多年来,随着第一代农民工的相继归乡,第二代农民工迈开了他们的进城步伐.第二代农民工的“城市梦”比第一代农民工更为执著,也正是这个原因,使得他们成为更易于市民化的群体,因此如何让农民工真正融入城市群体,最终实现市民化是当代城市化建设中一个重要的课题.文章主要利用问卷调查的方式对第二代农民工社会融入现状进行分析,找出他们在社会融入与市民化过程中遇到的问题,最终提出解决方案.     

世界化工潮流

光催化剂二氧化钛膜的生产方法(日本) University of Osaka Prefecture的研究小组最近开发了光催化剂二氧化钛(TiO_2)薄膜的有效生产方法,这种薄膜可与人造光和太阳光反应。与现有方法比较,该法采用磁溅工艺,比较简单,并有工业应用的潜力。 Jpn. Chem. Week Apr. 8,1999,40(2020),p1,11 防护品用氧化铁Euroxide(美国) Euroxides是Warner Jenkinson公司的氧化铁新产品,据说它可用于全部的配料及防护品领域,被称为化妆品颜色的新     

可见光图像的典型目标场景红外图像反演研究

为了方便快捷的得到典型地物的红外图像,提出了一种利用可见光图像反演红外图像的新方法.通过研究两种典型目标的特性.运用图像处理的相关知识得出可见图光图像和红外图像的灰度分布的关系,建立红外图像的反演模型.最后,由二者的映射关系,得到仿真的红外图像.实验结果表明.此方法可有效地提高反演效果,具有较强的实用性.     

Country Segmentation of the International Tourism Market Using Propensity to Travel and to Spend Abroad

ABSTRACT

Two new segmentation variables for the global international tourism market were operationalized. These variables were used to segment the countries of the world into nine market segments, which include heavy travelers, heavy spenders (HH); heavy travelers, medium spenders (HM); heavy travelers, light spenders (HL); medium travelers, heavy spenders (MH); medium travelers, medium spenders (MM); medium travelers, light spenders (ML); light travelers, heavy spenders (LH); light travelers, medium spenders (LM); and light travelers, light spenders (LL). The profile of these country segments were further examined using discriminant analysis. Implications of findings for targeting and promotion strategies are discussed, and directions for future research are given.     

浅谈轻钢混凝土结构性能及应用

目前轻钢混凝土结构被广泛应用于民用、工业建筑中,取得了良好的经济效益与社会效益.本文阐述了轻钢结构的发展历史,介绍了轻钢结构性能及特点,详细分析了轻钢混凝土组合结构体系.     

杨志成 那抹霓虹 那些收藏

<正>"如果要谈论我的人生,那么,有两样东西是必然要提的:一个是霓虹灯,一个是收藏。"坐在对面的杨志成如是说。杨志成今年50多岁,人却显得格外精神。笔挺的身板,得体的装束,精干中混合着些许儒雅。熟悉他的人都知道,他有着两个重要身份:一个是国内霓虹灯行业的开拓者,一个是收藏家。霓虹灯有关他的事业,而收藏关乎他的爱好。前者成就了他前半生的绚烂,后者则会让他的后半生更加美妙。     

汽车市场“以旧换新”大补贴

<正>在国家对燃油税进行改革的时候,你有买车、换车的冲动吗?那么宣布购置税减半政策的时候呢?如果再来一项汽车报废补贴政策呢?     

Effects of Lightness‐Location Congruency on Consumers’ Purchase Decision‐Making

A considerable body of psychological and neuroscientific research has demonstrated the existence of robust sensory correspondences between various features, attributes, or dimensions of experience in different sensory modalities. Despite findings indicating the importance of sensory correspondences to human information processing, research on purchase decision‐making has not to date focused sufficiently on this phenomenon. The present study examines how the lightness of packaging colors, and the location of products on a display shelf interact to affect consumers’ purchase decision‐making via perceived visual heaviness. As predicted, a display with light (dark) colored products positioned in the upper (lower) shelf positions increases shoppers’ perceptual fluency and facilitates their visual search, thus leading to the suggestion that “light” (heavy) locations are most appropriate for light (dark) colored products. Moreover, the lightness‐location congruent display is shown to influence people's choice behavior positively as well. This research also demonstrates that when consumers consider the lightness (in terms of their weight) of the products, they are more likely to choose light (vs. dark) colored products located in the upper shelf positions. These results therefore demonstrate that consumers’ purchase decision‐making may be promoted by in‐store environments designed to be congruent with their sensory correspondences.     

The association of light trucks and vans with paediatric pedestrian deaths

The hypothesis that relative to cars, light trucks and vans (including sports utility vehicles) are more likely to result in fatal paediatric pedestrian injury was investigated. It was further hypothesized that this increased risk is a result of head injuries. The study sample consisted of 18 117 police records of motor vehicles involved in crashes in which one or more pedestrians aged 5 to 19 years old was injured or killed. Frequencies and case fatality ratios for each vehicle body type were calculated. A logistic regression analysis was conducted, with light truck or van vs. car as the exposure variable and fatal/non-fatal pedestrian injury as the outcome variable. After controlling for driver age, driver gender, vehicle weight, road surface condition and presence of head injury, 5 to 19 year-olds struck by light trucks or vans were more than twice as likely to die than those struck by cars (odds ratio (OR) 2.3; 95% CI 1.4, 3.9). For the 5 to 9 year-old age group, light trucks and vans were four times as likely to be associated with fatal injury (OR 4.2; 95% CI 1.9, 9.5). There was an association between head injury and light trucks and vans (OR 1.2; 95% CI 1.1, 1.3). It was concluded that vehicle body type characteristics play an important role in paediatric pedestrian injury severity and may offer engineering-based opportunities for injury control.     

Firm Experience and International Trade Fairs

This paper examines the behaviour of firms at international trade fairs (ITF). It advances the idea that prior ITF exhibiting experience shapes practice and performance. ITF usage is used as a proxy for experience and two groups identified—"heavy users" and "light users." Propositions are developed and tested on data collected from 303 Canadian companies. Key findings are that (1) fair selection practices appear to differ only marginally between heavy and light ITF users, whereas (2) exhibit planning and management practices, and (3) performance levels, differ sharply between heavy and light ITF users. Thus, experience impacts on ITF planning and management practices, and on performance levels, but less so on ITF selection.     

烟草异物剔除系统的光源特性及其对剔除性能的影响

烟草异物剔除系统采用先进的机器视觉技术，通过成像设备来获取物料光谱图像，通过对光谱图像数据的处理来识别和别除杂物。良好的光源与照明方案是烟草异物剔除系统的关键环节之一。为有效提高行业应用烟草异物剔除系统的性能，在考察当前烟草异物剔除系统所使用光源的基础上，从光源种类、光源频谱、成像效果等方面进行了比较和分析，并对光源对烟草异物剔除系统性能的影响进行研究分析。研究结果表明：LED光源凭借其优异特性正成为光电式烟草异物剔除系统的最佳光源。     

对贯彻执行“新消防法”的几点思考——以“央视新址和长乐拉丁酒吧火灾事故”为例

分析了近期由于监管不到位而引起的两起严重火灾事故，结合新颁布的消防法，提出提高消防监管实效的措施。     

The World Market for Light Sources: Lamps and LEDs, 2006–21

The global light source sector is experiencing fast growth in the current decade; market size is expected to reach the $78 billion mark in 2016 compared with $44 billion in 2011; but growth is likely to slow after that. Key factors in this field are energy conservation, affordability of more efficient lights, the quest for better light quality, and standards by agencies and associations. Regionally, Asia-Pacific is expected to assume a commanding lead with 53 percent of the global total by 2016 compared with North America at 17 percent and Western Europe at 14 percent. Fluorescent and incandescent lamps combined dominated with 71 percent as a share of world sales in 2011; they and light-emitting diodes (LEDs) are expected to each be at 42 percent of the total by 2016. Technological advances created less costly LEDs that now offer longer life, better light quality, and more flexibility. In terms of markets or end-uses, buildings are expected to capture about 75 percent of the total in 2016, with the remainder taken by outdoor applications, motor vehicles, and other manufactured goods. Three firms account for about 25 percent of market share globally: Philips Lighting, Osram, and General Electric. All of them pursue an aggressive research and management agenda; the first two are reorganizing. Battle for market share is bound to continue by companies around the globe. The standardized nature of sockets allows for flexibility by users and often leads to commodity type marketing. (This paper and the monograph on which it is based exclude both lighting fixtures and lighting control systems. For information on lighting fixtures, see The Freedonia Group [2012].)