Landfill is an important atmospheric mercury emission source

Due to the special physical and chemical properties,mercury is a global pollutant which could be aeriallytransported cross the borders[1,2]. Both natural processesand human activities emit mercury to the air. The majoranthropogenic mercury emission source categories arecoal combustion, waste incineration, chlorine-alkali plant,metal smelting and refining and so on[1—3] . Human activi-ties emit not only elemental mercury (Hg0), which has along lifetime in the air, but also reactive gaseous mer…     

Fabrication and spectra characteristics of high efficiency white organic light-emitting diodes with single emitting layer

High-efficiency white organic light-emitting devices with single emitting layer are demonstrated. N,N‘-diphenyI-N,N‘-bis(1,1‘-biphenyl)-4,4‘-diamine (NPB) is used as hole transport layer, while 4,7-diphenyl-l,10-phenan-throline (BPhen) as electron transport layer and 9,10-di-(2-naphthyl)-2-terbutyl-anthracene (TADN) doped with the fluorescent dye 4-(dicyanomethylene)-2-t-buty1-6-(1,1,7,7-tetramethyljulolidyl-9-enyl) (DCJTB) as single emissive layer. The effects of performance by the concentration of DCJTB and the thickness of emissive layer are studied. The device with a structure of indium tin oxide/NPB (50 nm)/TADN: 0.2% DCJTB (15 nm)/BPhen (40 nm)/Mg: Ag shows a maximum brightness of 11400 cd/m^2, a peak current efficiency of 5.6 cd/A and power efficiency of 4.1 Ira/W, while the low turn-on voltage of 3.1 V and the stability of the Commission International De L‘Eclairage coordinate. The spectra through color filter of the device are also studied.     

一种Ad Hoc网络收方发起的媒体接入控制算法

在结合多包接收技术以及功率控制的基础上提出了一种发射能级可控的应用于AdHoc网络的收方发起的媒体接入控制算法,并对其吞吐量和能耗作了分析。与RTS/CTS(requesttosend/cleartosend)握手机制相比,在一定假设条件下,网络吞吐量有着明显的提高,与此同时,系统发射功率最多可降低60%以上。     

碱金属卤化物热力学性质的拓扑研究

基于原子外层价电子数ni及鲍林电负性χpii定义新的原子点价(Hi),并在邻接矩阵基础上建构元素键参数连接性指数(mB).用其中0B、1B分别与20种碱金属卤化物的F心能带[E(F)]、晶格能(U)、标准熵(Smθ)性质关联,它们的相关系数(R)依次为0.992、0.995、0.993,达到优级(R>0.99).结果表明,mB可在化合物的QSPR/QSAR研究中成为具有广泛、良好相关性的结构参数.     

Potential existence of two independent centrosometargeting domains in PP4

Protein phosphatase 4 (PP4) is an important member in the PPP family of protein Ser/Thr phosphatases. It has been proven to regulate a variety of cellular processes such as centrosome maturation, micro- tubule nucleation, splicesome assembly, and JNK pathway activation. Compared to the crystallized and structurally well defined phosphatase PP1 and PP2B, little is known about the structure of PP4. Besides the conserved motifs characteristic of the PPP family, no information is available on the other domains of PP4. PP4 is reported to localize to the centrosome in many species such as Drosophila, Caenor- habditis elegans and mammalian cells, which suggests a conserved role of PP4 in the regulation of centrosome function. Unlike several other centrosomal proteins, no sequence has been identified for PP4 that can target it to specific centrosomal localization. In this study, we used a combination of PCR mutagenesis and transient expression of GFP-tagged proteins in mammalian cells, and identified two PP4 centrosome-targeting domains of 68―136 and 134―220 aa. These two domains may be associated for appropriate localization to the centrosome. The findings are useful for further elucidating the func- tion of the domains and other structural characteristics of PP4.     

改性活性炭吸附脱除RFCC柴油中碱性氮化物的工艺研究

用改性活性炭吸附脱除RFCC柴油中的碱性氮化物。考察了改性酸的浓度、吸附剂的投加量、吸附时间、吸附温度对吸附效果的影响。结果表明：室温下，最佳改性酸浓度为70％，100mL RFCC柴油中吸附剂的最佳投入量为0．5g，最佳吸附时间为20min，在此条件下，RFCC柴油中的碱性氮化物脱除率为97．25％，油品收率大于98％，透光率从4．2％提高到34．1％，颜色由橙红色转为淡黄色。     

钙钛矿La0.7Pb0.3MnO3的磁电阻效应及输运特性

采用固相反应烧结法成功制备了钙钛矿La0.7Pb0.3MnO3单相多晶样品,利用超导量子干涉仪和直流四探针法主要研究了La0.7Pb0.3MnO3块体的磁电阻效应及输运特性.结果表明,此样品在居里点附近由铁磁向顺磁过渡,且表现出典型的团簇玻璃特征.磁电阻的极大值出现在居里温度附近.当H=0.5T时,磁电阻的极大值为6.8%,当H=1T时,磁电阻的极大值为12.4%.输运结果表明,T1区金属导电是由于电子散射造成的,T2区半导体特性是由于小极化子跃迁引起的.     

B样条曲线曲面的降阶方法

基于优化技术,给出了B样条曲线曲面降阶的简便方法,曲线曲面降多阶问题只需要求解一个线性方程组。该方法不管是算法复杂性还是降阶逼近效果都明显好于之前方法,最后还进行了解的存在性分析和误差分析。     

莲雾香气成分分析

采用同时蒸馏萃取方法提取莲雾香气成分,经气相色谱-质谱联机分析,结果表明:莲雾的主要香气成分为3-蒈烯、2-乙基-1-己醇、石竹烯、异松油烯、松油醇、α-水芹烯、对伞花烃、4-蒈烯、α-蒎烯、己醛等.     

饱和醇结构-保留定量相关的人工神经网络模型

以拓扑指数为结构描述符,用基于Levenberg-Marquardt优化的BP神经网络建立了醇类化合物的结构与色谱保留值的相关性模型,用于未知醇类化合物在SE-30和OV-3两根色谱柱上保留指数的同时预测,其学习速率优于文献中普通BP神经网络法,预测准确度与普通BP神经网络法接近,但优于多元线性回归法,因而是一种较好的预测有机化合物气相色谱保留指数的方法.