一类统计量的强大数律和重对数律的精确极限性质

设{Xn,n≥1}是独立同分布随机变量序列,EX1=0,EX12=1.设Sn=n∑i=1Xi,Tn=Tn(X1,…,Xn)是随机函数且Tn=Sn+Rn.本文证明在E|Rn|2∨r《∞或E|Rn|《∞下,对随机函数Tn成立着Baum-Katz强大数律和重对数律的精确极限性质的一般结果.由此作为推论,对U-统计量,Von-Mises统计量,线性过程,移动平均过程,线性模型中误差方差估计和功率和等在适当矩条件下均可写出Baum-Katz强大数律和重对数律的精确极限性质.     

SLURRY FISCHER-TROPSCH/ZSM-5 TWO-STAGE PROCESS OF CONVERTING SYNGAS TO GASOLINE Ⅱ. REACTOR-WAX WITHDRAWAL AND LONG-TERM TEST

IotroductionDuetotheuniquefcauresoftheslunyF-TreaCtor.synthesisgaswithH2/COmolarratioaslowas0.6tO0.7canbcdirectlyused,providedthatthcF-Tcatalysthaswaer-gas-shiftreaCtion4ctivity.ThesclowH2/C0ratiogascscangcnerallybeobtainedfrOmtheadVantalcoalgasificaions}'stemswhichhavchighthermalefficicncyandarepoentiallylowercostthancurrentonc.C0nsCquentl}',acombinationofthcseadvanccdcoalgasificaionsystcmsw'iththeFischcr-TroPschlZSM-5two-stwetechnologyconStitUtesanovelandlowercostrouteofconvcrtingco…     

Rheologic Properties of a Water-Soluble Terpolymer with Vinyl Biphenyl

A water-soluble acrylamide-modified terpolymer (PAAP) with sodium 2-acrylamido-2-methylpropane sulfonate and vinyl biphenyl as the hydrophobic monomer was synthesized to obtain a polymeric thickening agent applied in middle- and low-permeability oil reservoirs. The polymer is expected to possess a low molecular weight and high solution viscosity. The steady-state consecutive shear cycles of PAAP in aqueous and brine solutions were measured, and the viscoelastic properties of PAAP solutions were investigated as a function of polymer, NaCl and sodium dodecylbenzene sulfonate (SDBS) concentrations. The aqueous PAAP solutions exhibits pseudoplastic and thixotropic behavior over the range of shear rate and shear thickening behavior at very low shear rate. The steady-state shear results show that some disrupted associating aggregates at high shear rate can be reformed during the shear reversion process and the suitable shear rate is favorable to the formation of hydrophobically associative structures in the brine solutions. Above 0.05 g⋅dL⁻¹ PAAP, aqueous PAAP solutions have predominantly elastic character over the range of angular frequency that is strengthened with increasing polymer concentration. The PAAP brine solutions exhibit predominantly elastic behavior only above 3 rad⋅s⁻¹ and a salt-thickening effect. By addition of an optimum amount of SDBS (0.5–0.8 mmol⋅L⁻¹), the complex viscosities become much higher than the dynamic viscosities, although the loss tangent values increase owing to the formation of loose associative structures.     

L-酪氨酸衍生物的合成及其与人血清白蛋白的相互作用

以L-酪氨酸为原料,分别与邻甲氧基肉桂酸和间甲氧基肉桂酸进行了酰胺化反应,合成了两种L-酪氨酸衍生物(E)-3-(4'-羟基苯基)-2-[3″-(2-甲氧基苯基)丙烯酰胺基]丙酸(I)和(E)-3-(4'-羟基苯基)-2-[3″-(3-甲氧基苯基)丙烯酰胺基]丙酸(II),运用ESI-MS、1H NMR、13C NMR对其结构进行表征确认。通过荧光光谱、紫外可见吸收光谱结合Auto Dock分子对接方法,研究了化合物I和II对人血清白蛋白(HSA)的作用机制。结果表明,I和II对HSA的猝灭机制为静态猝灭,过程中伴随着非辐射能量转移。化合物I和II主要通过疏水作用与HSA的结合,结合过程是自发的。Auto Dock分子对接结果表明化合物I和II与HSA之间主要是疏水作用力,结合位点位于亚结构域IIA形成的疏水腔中,即site I。分子对接结果与光谱实验结果基本一致。     

Characterization, Solution Behavior, and Microstructure of a Hydrophobically Associating Nonionic Copolymer

To obtain an oil-displacement polymer with good thermal stability and solution properties, self-assembling acrylamide (AM)/4-butylstyrene (BST) copolymers (PSA) were synthesized by the micellar copolymerization technique. The resulting polymer was characterized by elemental analysis and UV and FT-IR spectroscopy. Conventional DSC measurement was used successfully to characterize the hydrophobic microblock structure of PSA, and two glass transition temperatures were found in the polymer: at 203 °C for the AM segments and at 106 °C for the hydrophobic BST segments. The initial decomposition temperature (234 °C) of the polymer is higher than that of polyacrylamide (210 °C). The DSC and TG results suggest that incorporation of BST into PSA enhances the molecular rigidity and thermal stability of the polymer. The apparent viscosity of a PSA solution greatly depends on the amount of BST in the polymer, and the polymer exhibits salt-thickening, temperature-thickening, thixotropy, pseudo-plastic behavior, anti shearing, and good anti-aging properties at 80 °C. In addition, the apparent viscosities of PSA solutions are increased remarkably by the addition of a small amount of surfactant. AFM measurements show that large block-like aggregates and small compact aggregates are formed in aqueous solutions of 0.4 g⋅dL⁻¹ PSA because of strong intermolecular hydrophobic associations, despite the low molecular weight, and their sizes increase upon addition of a small amount of salt.     

一种满足多阶固有频率和节线位置等要求的结构动力学设计方法

在给定了多阶固有频率、振型节线位置、结构的质量与质心等要求条件下，运用优化方法进行结构动力学设计，文中还给出了一种振型节线的直接搜索法，且对一个实际的机翼颤振模型进行了设计。     

On large increments of a two-parameter fractional Wiener process

In this paper, how big the increments are and some liminf behaviors are studied of a two-parameter fractional Wiener process. The results are based on some inequalities on the suprema of this process, which also are of independent interest     

液质联用技术在大鼠血浆阿糖胞苷和代谢产物阿糖尿苷定量分析中的应用

建立同时测定阿糖胞苷和代谢产物阿糖尿苷在大鼠血浆中浓度的LC-MS/MS方法,并将该方法用于研究阿糖胞苷静脉注射后血药浓度的监测。色谱柱是安捷伦ZORBAX SB-C18色谱柱(50mm×2.1mm,1.8μm),采用梯度洗脱的方式分离被测物质,利用沉淀蛋白的方法处理血浆样品,以多反应监测(multiple reaction monitoring,MRM)扫描方式检测。阿糖胞苷和阿糖尿苷在线性范围内线性关系良好,日内日间精密度(RSD)均小于15%,准确度(RE)在±15%以内,平均提取回收率都在80%以上,基质效应在90%和110%之间。该方法适用于阿糖胞苷注射后的临床前药物监测和大鼠药物动力学研究。     

两类高斯过程的局部连续性模型

Abstract. In this article,local continuity moduli for the fractional Wiener process and l^∞-valued Gaussian processes is discussed.