Viscosity approximation methods for generalized equilibrium problems and fixed point problems with applications

In this paper, we introduce a general iterative scheme for finding a common element of the set of common solutions of generalized equilibrium problems, the set of common fixed points of a family of infinite non-expansive mappings. Strong convergence theorems are established in a real Hilbert space under suitable conditions. As some applications, we consider convex feasibility problems and equilibrium problems. The results presented improve and extend the corresponding results of many others.     

基于GPU的液晶大气湍流模拟器波面生成的并行实现

为了使液晶大气湍流模拟器具有实时大气模拟能力,在GPU通用计算架构下提出了基于GPU的液晶大气湍流模拟器实时波面生成计算方法。针对液晶湍流模拟器高分辨率、高精度的特点介绍了湍流波面生成计算方法,论述了CUDA通用计算架构。建立基于GPU的波面生成模型,并对该模型进行了并行化优化和共享存储器优化。给出了采用CPU与GPU进行波面生成的实验对比结果。结果表明：采用GPU生成分辨率为256256, 192项Zernike多项式进行波面生成的平均时间为2.5 ms,生成速度比CPU少两个量级,满足实时波面生成的要求。     

方位远探测声波测井仪接收声系实验研究

方位远探测声波测井仪接收声系中各通道接收换能器及相应采集电路的综合一致性极大地影响处理结果的精确度,必须测试并进行必要的校正。在实验室构建了接收声系测试系统,使用主频10 k Hz的单极子声源辐射声场,测量了阵列化声系中每个换能器单独正对单极声源时所有通道的采集波形,分析了波形的时域和频域特征,对声系站内、站间的各通道综合一致性进行了评价并给出接收通道一致性不好时的校正公式;对比了相控接收子阵与单个阵元的接收特性。实验结果表明,该声系各通道综合一致性较好,不需要校正;软件相控处理后,接收阵的能量比单个阵元强、指向性更好,有利于提高有用信号的信噪比和空间的探测分辨率。     

Novel CeO<Subscript>2</Subscript> nanorod framework prepared by dealloying for supercapacitors applications

The CeO₂ nanorod framework was synthesized via a facile-dealloying method coupled with calcination treatment for supercapacitors. X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) characterizations identified the cubic phase and nanorod morphology of the synthesized sample. Their electrochemical performance was also evaluated by cyclic voltammetry, galvanostatic charge-discharge tests, and cycling performances. The results show that CeO₂ nanorod framework possesses high-specific capacitance and superior charge/discharge stability, which are mainly ascribed to its high-Brunauer-Emmett-Tellar surface area (110.6 m² g^?1). Notably, the CeO₂//AC (Active Carbon) asymmetric supercapacitor device exhibits excellent cycling stability with capacity retention of 133.6% after cycling for 30,000 cycles.     

用瑞利散射研究聚氯乙烯/橡胶共混物的两相分布

用瑞利散射研究聚氯乙烯/橡胶共混物两相尺寸,测定了聚氯乙烯/顺丁橡胶和聚氯乙烯/丁睛橡胶共混物的V_v光散射强度,用Debys——Bueche方程计算了相关距离a_c,讨论了a_c的变化规律。     

COLOC—S脉冲序列在天然有机化合物结构分析中的应用

本文用远程异核化学位移相关谱(COLOC-S脉冲序列)和异核化学位移相关谱研究了香茶菜属二萜类化合物冬凌草甲素和香茶菜醛的化学结构,并对这两个化合物的~(13)C和~1HNMR谱线进行了归属。     

西洋参皂甙的核磁共振波谱研究Ⅰ.西洋参叶中Ocotillol型皂甙的结构分析

本文用常规一维¹H、¹³C核磁共振波谱和远程异核化学位移相关谱。异核化学位移相关谱和同核化学位移相关谱技术研究了西洋参叶中首次分离出的一种Ocotillol型皂甙,确认了化学结构,并对其¹³C、¹H NMR谱线进行了归属。     

Complexes having the fac-[M(CO)3]+ core (M=Tc, Re) useful in radiopharmaceuticals: X-ray and NMR structural characterization and density functional calculations of species containing two sp3 N donors and one sp3 O donor

Radiopharmaceuticals containing the "fac-[M(CO)3]+ " core (M=99mTc, 186Re, or 188Re) have potential as diagnostic or therapeutic agents. Complexes with this core with sp3 amine donors have received little attention. We have studied adducts formed by ENDACH2 (HO2CCH2NHCH2CH2NHCH2CO2H) and ENACH (NH2CH2CH2NHCH2CO2H). Re(CO)3(ENDACH)-A (1A) and Re(CO)3(ENDACH)-B (1B) isomers were obtained by the reaction of ENDACH2 with Re(CO)5Cl. Re(CO)3(ENAC) (2) was obtained by the reaction of ENACH with aqueous [Re(CO)3(H2O)3]+. From single-crystal X-ray data, the three new neutral complexes, 1A, 1B, and 2, have a six-coordinate, pseudo-octahedral Re center with facially coordinated carbonyl ligands. ENDACH- and ENAC- bind facially to Re through both amine nitrogens and one carboxyl oxygen, forming two five-membered chelate rings. The Re(CO)3(ENDACH) isomers have an uncoordinated, dangling -CH2CO2H group, which is an ideal coupling site for attachment to biomolecules. The isomers differ by the configuration of the NH center bearing this dangling group. The H atom of the amine (N2) is endo (near the carbonyl ligands in the basal plane) in 1A and exo (away from carbonyl ligands) in isomer 1B. Isomers reach equilibrium (1A:1B, 70:30) after 3 days at high pH. Density functional structure optimizations were performed for isolated molecules of the type Tc(I)/Re(I)(CO)3(N2O): [Re(CO)3(NH3)2(H2O)]+, [Tc(CO)3(NH3)2(H2O)]+, [Re(CO)3(EN)(H2O)]+ (EN, ethylenediamine), [Tc(CO)3(EN)(H2O)]+, and various models for 1A, 1B, and 2. The computed structures are in good agreement with the X-ray structures. The theoretical and experimental Re-N bond distances usually agree within 0.045 A. The total electronic energy values for the computed 1A and 1B models differ by 0.815 kcal mol(-1), giving an isomer ratio of 80:20, in good agreement with the 1A/1B ratio (70:30) found.     

杨氏模量的两种测试方法

本文介绍了对杨氏模量测定仪的改进方法，并与使用原装置测得的数据进行了对比，拓宽了实验的内容。     

具有分子取向的拉伸高聚物(PET)中13C-NMR化学位移值的估算

本文从已知的聚对苯二甲酸乙二醇酯(PET)的X-射线原子坐标和化学位移张量主值出发,计算了拉伸的PET样品,相对于外磁场不同放置方位下的¹³C-NMR谱峰的化学位移值,很好地解释了实验结果,并得到了拉伸条件下,高聚物中分于取向的信息。