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.     

螺旋转子数控加工的数学建模分析与研究

该文在三维设计制造软件中对大模数少齿数螺旋转子建立了实体模型;将渐开线和摆线螺旋面的形成原理应用在螺旋转子数控加工上分析得出:加工时刀具中心与螺旋面距离在螺旋面法矢方向上与刀具半径成一线性比例,在平行于轴线方向上为一定值;利用渐开线和摆线螺旋面微分几何性质建立了螺旋转子的加工数学模型,对螺旋转子数控加工过程进行了仿真,生成了数控加工代码;最后在立式加工中心对螺旋转子的三维实体建模结果、数控加工仿真过程进行了验证,取得了理想效果。     

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.     

新型三相四线制串级调速系统的建模与仿真

以提高串级调速系统的功率因数为目的，利用软件包SIMULINK以电气原理图为基础，以一种类似于电路绘制的建模方式，仿真研究了一种新型三相四线制串级调速系统。对该系统的逆变桥的特点、触发脉冲的规律进行了论述。对其特有的逆变桥、触发器通过子系统封装的方式定制和创建自己的模块，仿真研究了其提高功率因数的原理。仿真研究了新型三相四线制串级调速系统的速度调节、主回路的相关波形、在不同转速下新型三相四线制串级调速系统的有功功率、无功功率情况。仿真结果表明该系统的功率因数较普通串级调速系统有明显的提高。     

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.