浅谈应用460MHz无线中继通信技术推进井下安全避险六大系统建设

应用460MHz无线中继通信和漏缆传输技术,构筑井下信息高速公路,做到一缆多用、数话同传,满足井下安全六大系统信息传输。此技术在无线通信上既能满足正常时矿井调度指挥通信,又能在井下灾变时对井下所有班组进行紧急呼叫,赢得宝贵的安全撤离时间,有效地保护矿工生命安全。     

分子键合TM技术在垃圾焚烧飞灰治理中的应用

结合国内垃圾焚烧飞灰的治理现状,对分子键合TM技术治理垃圾焚烧飞灰的原理、工艺进行了介绍分析,并通过实验研究对分子键合TM技术在垃圾焚烧飞灰治理中的应用进行了探讨。     

内源性气态SO2对大鼠血管的舒张作用及其机制IV： SO2对血压的调节与信号通路

为探讨内源性二氧化硫(SO2)对动脉血压的影响及其信号转导通路,采用大鼠颈动、静脉插管技术研究SO2对动脉压调节作用,通过离体血管环灌流试验观察SO2对NE引起的主动脉血管环收缩作用的影响,用生物化学方法与实时定量RT-PCR技术研究SO2对离体血管一氧化氮(NO)生成、一氧化氮合酶(NOS)活性和基因表达的调节作用。结果表明：(1)静脉注入SO2(20和60 μmol·kg-1体重)可立即引起大鼠动脉血压剂量依赖性显著下降,而相同剂量的亚硫酸钠和亚硫酸氢钠混合液(摩尔比为3:1)未见影响;(2)SO2对NE的缩血管功能有显著抑制作用,使NE的量效曲线右移;(3)SO2能迅速促进内皮NOS(eNOS)的基因表达,增强eNOS的活性,但对诱导型NOS (iNOS)的活性未见影响;(4)SO2可迅速且显著增加主动脉组织的NO产量。此外,我们以前的研究也指出,低浓度SO2可引起内皮细胞膜BKCa离子通道开放。由此结论：内源性SO2是一种血管活性因子,对整体血压和血管张力具有调节作用;SO2对血管BKCa→eNOS→NO→cGMP信号通路的上调可能是其主要的作用机制。     

Molecular analysis of long-term biofilm formation on PVC and cast iron surfaces in drinking water distribution system

To understand the impacts of different plumbing materials on long-term biofilm formation in water supply system, we analyzed microbial community compositions in the bulk water and biofilms on faucets with two different materials-polyvinyl chloride （PVC） and cast iron, which have been frequently used for more thanlO years. Pyrosequencing was employed to describe both bacterial and eukaryotic microbial compositions. Bacterial communities in the bulk water and biofilm samples were significantly different from each other. Specific bacterial populations colonized on the surface of different materials. Hyphomicrobia and corrosion associated bacteria, such as Acidithiobacillus spp., Aquabacterium spp., Limnobacter thiooxidans, and Thiocapsa spp., were the most dominant bacteria identified in the PVC and cast iron biofilms, respectively, suggesting that bacterial colonization on the material surfaces was selective. Mycobacteria and Legionella spp. were common potential pathogenic bacteria occurred in the biofilm samples, but their abundance was different in the two biofilm bacterial communities. In contrast, the biofilm samples showed more similar eukaryotic communities than the bulk water. Notably, potential pathogenic fungi, i.e., Aspergillus spp. and Candida parapsilosis, occurred in similar abundance in both biofilms. These results indicated that microbial community, especially bacterial composition was remarkably affected by the different pipe materials （PVC and cast iron）.     

Mechanism and rate constants for complete series reactions of 19 fluorophenols with atomic H

Fluorine-containing halogenated fluorophenol may have efect as intermediate species involved in the formation of polyfluorinated dibenzo-p-dioxin/dibenzofurans(PFDDs/Fs). The mechanism for the atomic H initiated reactions with complete series of nineteen fluorophenol congeners was studies using the density functional theory. At the MPWB1K/6-31+G(d,p) level, the geometries and frequencies of reactants, transition states, and products were obtained, and the accurate energetic values were acquired at the MPWB1K/6-311+G(3df,2p) level. The rate constants were evaluated by the canonical variational transition-state theory with the small curvature tunneling contribution over a wide temperature range of 600–1000 K. The study shows that the intramolecular hydrogen-bond in the ortho-substituted FPs as well as the inductive efect of the electron-withdrawing fluorine and steric repulsion of multiple substitutions may ultimately be responsible for the relative strength of the O–H bonds in FPs. The results can be used for further studies on PFDD/Fs formation mechanism.     

Degradation of dibromophenols by UV irradiation

We examined the degradation of dibromophenols （DBPs）, i.e. 2,4-DBP, 2,6-DBP and 3,5-DBP by ultraviolet （UV） irradiation and estimated the relationship between degradability and molecular orbital properties of each dibromopbenol. The removal of DBPs under a UV lamp system was successfully performed in an aqueous solution. After 5 min of irradiation, the initial DBPs concentration of 20 mg/L was decreased to below 1 mg/L, and about 60% of bromide ion was released. A decrease in the concentration of dissolved organic carbon （DOC） suggested the mineralization of DBPs, The mineralization may occur after release of bromide ions because the decrease of DOC was slower than the release of bromide ions. The degradability of 3,5-DBP was slightly lower than 2,6-DBP and 2,4-DBE Molecular orbital calculation suggested that the electrophilic frontier density and the highest occupied molecular orbital （HOMO） energy may be related to the degradability of DBPs.     

科技期刊常用量的符号、名称及释义

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EGSB+A/O工艺处理玉米深加工废水出水中DOM特性分析

采用超滤膜法对某玉米深加工污水站EGSB+AO工艺二沉池出水进行分级,结合总溶解性有机碳(DOC)浓度、UV254和三维荧光光谱分析出水中溶解性有机物分子质量分布特性。结果表明,玉米深加工废水二级出水中溶解性有机物以分子质量大于10 k和小于0.5 k物质为主,这2个区间组分的芳香度较高。三维荧光谱图分析表明,出水主要含有色氨酸类蛋白和腐殖质,各分子质量区间的腐殖质荧光强度大于同分子质量的蛋白质类物质,而腐殖质是在好氧曝气阶段生成。各分子质量区间有机物的总荧光强度和DOC浓度、UV254呈显著线性相关。     

刚果红分子印迹聚合物纳米微球的合成及吸附性能

本研究以刚果红为模板分子,α-甲基丙烯酸(MAA)为功能单体,二甲基丙烯酸乙二醇酯(EGDMA)为交联剂,乙腈为致孔剂,2,2-偶氮二异丁腈(AIBN)为引发剂,采用沉淀聚合法制备了刚果红分子印迹聚合物纳米微球(MIP).通过扫描、透射电镜对聚合物的结构和形貌进行了表征,结果显示制备的MIP微球的粒径在90 nm左右,粒径较为均匀.利用氮气吸附脱附实验测定了聚合物颗粒的比表面积和孔容.并对诸多吸附影响因素以及分子印迹聚合物的吸附能力、选择性和重复利用率进行了分析.结果表明,MIP对刚果红表现出较好的选择性识别能力,可多次循环使用,能用于染料废水中刚果红的选择性吸附.     

原煤卸围压过程微震信号响应特征*

为了研究煤体采动卸荷失稳破坏的微震动态响应规律,基于热流固耦合三轴试验机进行含瓦斯原煤卸围压试验采集试验过程中的微震信号,进行连续小波变换及4层小波包变换,识别煤样破裂信号,提出煤样破裂干扰信号的时频特征及相应的微震事件分布与破坏演变的特征。研究结果表明:加载初期甚至整个轴压增加过程中,煤样内部裂隙被压密,无新裂隙产生,基本无微震事件,开始卸围压时煤样破裂数量迅速增加;内部裂纹扩展信号主频为700 Hz,前期煤样内部裂纹扩展缓慢,事件产生频次低;煤样破坏信号主频为800 Hz,其频率跳变异常,信号频率成分无明显分带;煤样破坏时微震信号能量最大,破坏过程中伴随不同部位间相对位移,产生摩擦、揉搓,破坏频率成分复杂;煤样破坏时微震事件频数最大LH-2事件总数为176,破坏时每分钟事件数为76,破坏后事件数为92,分别占总事件比例43%,52%;LH-3破坏事件数及破坏后事件数分别占比36%,62%。