可爱的萤火虫,你在哪里?

"萤火虫萤火虫慢慢飞,夏夜里夏夜里风轻吹,怕黑的孩子安心睡吧,让萤火虫给你一点光……"今年夏天,在合肥做生意的汪艮华向多位朋友打去"求助电话",说他想给儿子捉几只萤火虫,可好多天都是空手而归,现在就是在乡下农村,也都看不见萤火虫,不知道这些可爱的小精灵躲到哪里去了。     

化学战剂热催化分解研究进展

热催化分解技术可将染毒空气加热后通过催化床,毒剂分子在催化剂活性位上发生吸附、氧化、脱烷和水解等一系列物理化学反应,生成CO_2等小分子化合物,该技术是一种广谱高效的净化技术.文中综述了催化材料对典型化学战剂的热催化分解性能.对于神经性毒剂沙林来说,活性炭、氧化钒和Pt催化剂有更好的催化活性,磷物种在催化剂上的逐渐累积是失活的主要原因;对于全身中毒性毒剂HCN和CNCl而言,水解反应对产物选择性的影响尤为重要;对糜烂性毒剂芥子气来说,催化剂的设计与反应机理的研究仍处在起步阶段;相比其他毒剂,窒息性毒剂光气更容易被催化分解,Pt催化剂对光气的热催化分解展现出较好的性能.本文将为设计合成高性能毒剂热催化分解材料提供一些参考.     

QBT—C型声屏障顶端降噪器

由青岛佰世坤建筑材料有限公司开发的QBT—C型声屏障顶端降噪器，适用于铁路、轻轨、公路交通噪声治理lT=程声屏障顶端。     

毛细管柱顶空进样测定大气中的丙酮、甲醇、乙醇和异丙醇

采用蒸馏水为吸收液，吸收大气中的丙酮、甲醇、乙醇和异丙醇，在气相色谱仪上顶空进样，经毛细管柱分离，以FID为检测器，可以准确地测出大气中的丙酮、甲醇、乙醇和异丙醇，以保留时间定性，峰高定量。     

水解酸化＋接触氧化＋消毒脱氯工艺处理医院废水技术

由广州市浩蓝环保工程有限公司开发的水解酸化＋接触氧化＋消毒脱氯工艺处理医院废水技术，适用于各种规模医院的废水处理。     

5B-3(F)型速测仪测定化学需氧量的探讨

文章对水样化学需氧量(CODCr)采用5B-3(F)型速测仪测定法和回流消解-滴定法进行了比较。将生活废水样品置于水浴超声波器中作用10min,使水样均匀化,再应用速测仪测定法加入随机配带的D试剂、E试剂等方法来缩短测定时间,减少二次污染并消除氯离子的干扰。实验结果表明此法简便、可靠。     

Q BT-C型顶端降噪器应用于北京铁路枢纽西黄线增建二线声屏障工程

一、基本情况2005年3月30日,北京铁路枢纽西黄线增建二线工程正式开工。西黄线为京九线引入北京枢纽的延伸线,同时也是枢纽内的一条联络线,沿既有西黄线西侧南下,跨越京山、永丰和丰双铁路及南三环、南四环,至于李营站,全长22.3km。中国铁路工程总公司所属的中铁六局太原铁建承担了北京铁路枢纽西黄线增建二线的龙头—北京西站改建工程。西黄增建二线工程建成后,将为北京南站引入京沪高速铁路提供施工过渡条件,同时西黄线的运营能力将大大提高,从而缓解京九线、京原线客运量增加的局面,为适应首都的重要地位,满足经济发展都将发     

药剂对自救器性能的影响

<正>在煤炭开采过程中,矿工会面临诸多危险,因此,必须为他们配备防护装备,而自救器即是其中重要的防护装备之一。目前在我国,一氧化碳过滤式自救器仍然是重要的自救装备,但在提高触媒强度和携带寿命方面还有很大的改进空间。一、一氧化碳过滤式自救器这是一种便携式的作用时间较短的个人防护装备,主要用于矿内发生火灾、沼气煤尘爆炸、煤(岩)与瓦斯突出等事故时,供矿工佩戴脱险,免于中毒或窒息,是最基本的矿工逃生自救用的个体防护用具。目前在我国普遍使     

Differences in the quality of steamed hull-less barley and wheat cakes北大核心CSCD

In this study, three different hull-less barley varieties were used to prepare steamed cakes, and their nutritional value, sensory qualities, textural properties, and in vitro starch hydrolysis were evaluated. The results showed that the contents of total dietary fiber (4.50%-5.12%), β-glucan (2.96%-3.96%), total flavonoids (12.56-38.73 mg/100 g), and γ-aminobutyric acid (5.08-9.53 mg/100 g) in the steamed hull-less barley cakes were significantly higher than that in the steamed wheat cake, which were 0.65%, 0.23%, 3.93 mg/(100 g), and 2.63 mg/(100 g), respectively. The sensory properties of steamed ordinary hull-less barley and wheat cakes were not significantly different, but the steamed 08-1127 (waxy hull-less barley) cake was softer and out of shape. The springiness, resilience, cohesiveness, gumminess, and adhesiveness of steamed ordinary hull-less barley cakes were similar to those of steamed wheat cake, while those of steamed 08-1127 cakes were significantly lower than those of steamed ordinary hull-less barley cakes. Steamed hull-less barley cake also showed a maximum starch hydrolysis rate (38.76%-42.74%) that was lower than that of steamed wheat cake (49.92%), and the contents of rapidly (11.58%-13.16%) and slowly digested starch (5.34%-7.56%) were lower than that of steamed wheat cake (17.21% and 15.97%, respectively). In addition, the glycemic (59.37-61.67) and hydrolysis indexes (35.82-40.00) were lower than those of steamed wheat cake (76.66 and 67.30, respectively), and the contents of resistant starch (2.74%-3.55%) were higher than those of wheat steamed cake (1.68%). Therefore, the steamed cakes of ordinary hull-less barley had a higher content of nutritional components than the steamed cake of wheat, and the in vitro starch hydrolysis parameters were better than those of steamed wheat cake. When it is necessary to consider both nutritional and sensory qualities, ordinary hull-less barley can be selected as the raw material for steamed cakes, but waxy hull-less barley is not suitable for making steamed cakes. © 2022 Science Press. All rights reserved.