蓝牙技术及其应用

蓝牙技术是一种无线通信标准,它利用无线链路在各种数字设备之间实现短距离、小功耗、低成本的话音和数据通信。本文讨论了它的起源、技术特点、组网、协议体系及其广阔的应用前景。     

N2O decomposition over K/Na-promoted Mg/Zn-Ce-cobalt mixed oxides catalysts

Three groups of cobalt mixed oxide catalysts（Mg/Zn-Co, Mg/Zn-Ce-C, K/Na-Mg/Zn-Ce-Co）were prepared by sol-gel or impregnation methods. The synergistic effects of transition metal, rare earth metal and alkali metal on cobalt mixed catalysts for nitrous oxide（N2O）decomposing to N2 and O2were investigated. The experimental results revealed that the catalytic activity for N2 O decomposition was promoted as Co2＋was replaced partially by Zn2＋/Mg2＋, moreover, the characterization analysis by XRD and XPS showed that Zn2＋/Mg2＋replaced Co2＋successfully into the spinel structure of Co3O4 and promoted significantly the catalytic activity. Especially, the addition of CeO2 and K2O/Na2O decreased the binding energy and resulted in an increase in the density of the electron cloud around Co and an improvement of the catalytic activity. Of the investigated cobalt mixed catalysts, the best catalytic activity was shown by 2% K-Zn0.5-Ce0.05-Co catalyst.     

贵阳市黔灵山泉水中26种元素的分析和评价

为考察饮用贵阳市黔灵山泉水是否对人体有益,使用ICP-MS(电感耦合等离子体质谱)对泉水中锂、铍、硼、铝、钛、钒、铬、锰、铁、钴、镍、铜、锌、镓、砷、硒、锶、钼、银、镉、锑、铯、钡、铊、铅和铀26种元素的含量进行了分析,并取自来水和市售瓶装水进行对比。结果表明:黔灵山泉水中元素含量符合国家对饮用水的要求,但其所提供的人体所需微量元素的含量与自来水和瓶装水相比并无明显优势。由于泉水不属于常规水源未对其进行日常监管,如果将黔灵山泉水作为饮用水源无明显益处,并存在一定风险。     

腾冲台数字化水温资料的初步分析

通过系统整理分析腾冲台数字化水温资料,总结出水温的正常动态类型：年动态为平稳—上升型;月动态类型为平稳—起伏型;日动态多为随机起伏型,伴随阶变stepped change（或脉冲突跳sudden jump of Impulse Type）.对水温数据进行均分差的简单处理,发现滇西及滇缅交界地区发生的中强以上地震震前资料均有显著的异常变化,为使用腾冲台水温资料进行识别及捕捉地震短临异常分析预测地震提供参考依据.     

PTA废水厌氧处理工程实例类比研究

文中介绍了PTA废水厌氧处理中目前国内普遍采用的厌氧（UASB）工艺.厌氧（UASB）工艺对PTA废水进行处理,不需要动力提供氧源,动力消耗低,可降低废水处理成本.厌氧（UASB）反应器的关键就是将反应器中的气固液进行三相分离,并保持反应器污泥的颗粒化.从工程实例的运行中概述了经典UASB反应器、新型UASB反应器和UASB Plus反应器的特点.     

气相色谱法同时测定空气中五种烷烃类化合物

本文建立了同时测定工作场所空气中5种烷烃类化合物(正戊烷、正己烷、正庚烷、正辛烷、正壬烷)的溶剂解吸气相色谱法,对所建立方法测定正辛烷的不确定度进行了评价。结果表明,该方法快速、简单,检出限低,精密度和准确度高,适用于工作场所空气中烷烃类化合物同时测定。     

Investigation of carbonyl compound sources at a rural site in the Yangtze River Delta region of China

Carbonyl compounds are important intermediates in atmospheric photochemistry, but their primary sources are still not understood well. In this work, carbonyls, hydrocarbons,and alkyl nitrates were continuously measured during November 2011 at a rural site in the Yangtze River Delta region of China. Mixing ratios of carbonyls and hydrocarbons showed large fluctuations during the entire measurement. The average level for total measured volatile organic compounds during the pollution episode from 25 th to 27 th November, 2011 was 91.6 ppb, about 7 times the value for the clean period of 7th–8th, November, 2011. To preliminarily identify toluene sources at this site, the emission ratio of toluene to benzene(T/B) during the pollution episode was determined based on photochemical ages derived from the relationship of alkyl nitrates to their parent alkanes. The calculated T/B was5.8 ppb/ppb, significantly higher than the values of 0.2–1.7 ppb/ppb for vehicular exhaust and other combustion sources, indicating the dominant influence of industrial emissions on ambient toluene. The contributions of industrial sources to ambient carbonyls were then calculated using a multiple linear regression fit model that used toluene and alkyl nitrates as respective tracers for industrial emission and secondary production. During the pollution episode, 18.5%, 69.0%, and 52.9% of measured formaldehyde, acetaldehyde, and acetone were considered to be attributable to industrial emissions. The emission ratios relative to toluene for formaldehyde, acetaldehyde, and acetone were determined to be 0.10, 0.20 and0.40 ppb/ppb, respectively. More research on industrial carbonyl emission characteristics is needed to understand carbonyl sources better.     

科技创新在生态文明建设中的作用和贡献

科技创新是第一生产力,生态文明建设同样需要依靠科技创新来支撑。本文通过分析科技创新与生态文明建设的关系,定量化分析了科技进步对污染减排的重要贡献作用,识别了现阶段科技创新促进生态文明建设的主要途径,并从提高科学认识、构建指标体系、研发关键创新技术、完善政策体系、培养科技人才等方面提出未来依靠科技创新促进生态文明建设的战略对策。     

基于本土物种的3种典型化合物急性生态效应阈值研究

预测无效应浓度(PNEC)是进行风险污染物水生态安全管理的重要依据。本研究进行了3种典型化合物五氯酚、硝基苯和氯化镉对10种我国不同营养级水生生物的24 h、48 h和96 h的急性毒性测试,根据实验结果计算了相应的急性PNEC,同时与根据美国环境保护局毒性数据库里的毒性数据计算获得的急性PNEC值,以及综合本实验结果与毒性数据库里的数据计算得到的急性PNEC值进行对比,发现通过3种数据来源获得的急性PNEC值中,硝基苯的PNEC值差异较大,由本次实验结果获得的急性PNEC值最小;其他2种化合物差异较小。这可能是由于本次实验所选的本土生物中华田螺和麦穗鱼对硝基苯比较敏感,并且数据库中硝基苯的急性致死数据较少、毒性值较大且变化范围较窄,而其他2种化合物数据量较为丰富,变化范围较宽,包括了较敏感物种的毒性数据。这表明为给我国水生生物提供一个安全可靠的保护,对于数据量较为丰富并且毒性值变化较宽的化合物(如五氯酚和氯化镉)可以直接根据数据库里的毒性数据进行PNEC值的计算;而对于毒性数据量较少、毒性值偏大且变化较窄的化合物(如硝基苯)需要进行本土敏感物种的毒性测试。     

铜锈环棱螺室内实验条件优化

铜锈环棱螺作为一种新兴的潜在生态毒理学模式生物,适宜实验条件是开展其室内毒理学研究的基础。在人为控制条件下,初步探讨了饵料、水深、底质、密度和钙离子浓度养殖条件对铜锈环棱螺成体生长的影响,并进一步对麻醉条件进行了筛选(Mg Cl2·2H2O、乙醇、丁香酚、盐酸普鲁卡因和MS-222)。结果表明:当投喂冰鲜小球藻、密度6个·L-1水体积、水深10~15cm、泥土底质并且水中钙离子浓度30 mg·L-1时,铜锈环棱螺的体重增长最为明显。麻醉效果表明,Mg Cl2·2H2O对成螺的麻醉时间短并且伤害小,可作为实验用麻醉剂首选。以上研究结果为发展以铜锈环棱螺为模式生物开展环境(生态)毒理学研究奠定了基础。