用镜像变换法计算X荧光分析的基体效应修正系数

本文阐述了在能量色散法X荧光分析中(EDCRFA)用经验系数法基体效应修正的基本表达式。由于在求解经验系数中存在的病态矩阵,造成计算结果误差很大,文中采用镜像变换法(Householder法)可以得到较稳定和精确的解,取得了明显的效果。     

石灰窑生产控制条件浅析

针对石灰窑操作的不稳定,石灰石产地变化频繁导致控制紊乱、操作困难等现象,对石灰窑的操作提出增加时间控制分析及相对静烧时间的概念。     

酶在蛋白质类食品生产加工方面的应用

介绍了蛋白酶、脂肪酶、乳糖酶、转谷氨酰胺酶的特性,及其在蛋白质类食品生产方面的应用,并展望其发展前景。     

银额盆地拐子湖凹陷北部烃源岩特征及控制因素

针对拐子湖凹陷勘探程度较低、有效烃源岩分布及控制因素不明确的问题,运用有机地球化学、沉积层序及构造演化分析方法,对温1井烃源岩特征及主控因素展开研究。研究结果表明:研究区烃源岩有机质丰度整体较低,受沉积层序、构造综合影响,高位体系域有利于有机质富集;有机质类型为腐泥腐殖型和腐殖型;有机质热演化程度差异较大,富泥质岩类的发育可促进早期的热演化进程,构造的后期抬升使局部生烃时间大幅缩短,故有机质成熟度从未成熟至高成熟均有分布;烃源岩展布受断裂及沉积演化控制明显。该研究可为拐子湖凹陷北部下一步勘探提供参考。     

Phases in the crystallization process of Zr_(65)Al_(7.5)Ni_(10)Cu_(17.5)metallic glass

The crystallization process of metallic glass Zr65Al7.5Ni10Cu17.5, (atom fraction in %) were studied by transmission electron microscopy and X-ray diffraction. Two stages of crystallization process, which are indicated by the two exothermic peaks in the differential scanning calorimetry diagram, were studied separately. It is found that the phases in the various stage of the crystallization are different, In the first stage, it consists mainly of tI-CuZr2 and tP-Al2Zr3 phases, between which a definite orientation relationship is found. While in the second stage, in addition to the above phases, phase hP2-Al2NiZr6 and phase hP3-α-Zr appear, between which another orientation relationship is also found. At the same time, a comparison is made based on the study of the phases exist in the arc-melted master ingot. The lattice parameters of the identified phases were determined and some interesting similarities were found. According to these similarities, all the phases were classified into two groups. The fi     

A Multilayered Mesoporous Gold Nanoarchitecture for Ultraeffective Near-Infrared Light-Controlled Chemo/Photothermal Therapy for Cancer Guided by SERS Imaging

Surface-enhanced Raman scattering (SERS) imaging has emerged as a promising tool for guided cancer diagnosis and synergistic therapies, such as combined chemotherapy and photothermal therapy (chemo-PTT). Yet, existing therapeutic agents often suffer from low SERS sensitivity, insufficient photothermal conversion, or/and limited drug loading capacity. Herein, a multifunctional theragnostic nanoplatform consisting of mesoporous silica-coated gold nanostar with a cyclic Arg-Gly-Asp (RGD)-coated gold nanocluster shell (named RGD–pAS@AuNC) is reported that exhibits multiple “hot spots” for pronouncedly enhanced SERS signals and improved near-infrared (NIR)-induced photothermal conversion efficiency (85.5%), with a large capacity for high doxorubicin (DOX) loading efficiency (34.1%, named RGD/DOX–pAS@AuNC) and effective NIR-triggered DOX release. This nanoplatform shows excellent performance in xenograft tumor model of HeLa cell targeting, negligible cytotoxicity, and good stability both in vitro and in vivo. By SERS imaging, the optimal temporal distribution of injected RGD/DOX–pAS@AuNCs at the tumor site is identified for NIR-triggered local chemo-PTT toward the tumor, achieving ultraeffective therapy in tumor cells and tumor-bearing mouse model with 5 min of NIR irradiation (0.5 W cm⁻²). This work offers a promising approach to employing SERS imaging for effective noninvasive tumor treatment by on-site triggered chemo-PTT.     

电子商务中SET协议的安全缺陷研究

目前SET协议在电子商务交易中应用越来越广泛,因此,对SET协议的安全性的要求就越来越高。论文在SET协议的交易流程基础上,分析了其安全机制采用的技术和优点,指出了SET协议安全性存在的一些问题。     

Ultrathin Layered Hydroxide Cobalt Acetate Nanoplates Face‐to‐Face Anchored to Graphene Nanosheets for High‐Efficiency Lithium Storage

The dramatically increasing demand of high‐energy lithium‐ion batteries (LIBs) urgently requires advanced substitution for graphite‐based anodes. Herein, inspired from the extra capacity of lithium storage in solid‐electrolyte interface (SEI) films, layered hydroxide cobalt acetates (LHCA, Co(Ac)_0.48(OH)_1.52·0.55H₂O) are introduced as novel and high‐efficiency anode materials. Furthermore, ultrathin LHCA nanoplates are face‐to‐face anchored on the surface of graphene nanosheets (GNS) through a facile solvothermal method to improve the electronic transport and avoid agglomeration during repeated cycles. Profiting from the parallel structure, LHCA//GNS nanosheets exhibit extraordinary long‐term and high‐rate performance. At the current densities of 1000 and 4000 mA g^?1, the reversible capacities maintain ≈1050 mAh g^?1 after 200 cycles and ≈780 mAh g^?1 after 300 cycles, respectively, much higher than the theoretical value of LHCA according to the conversion mechanism. Fourier transform infrared spectroscopy confirms the conversion from acetate to acetaldehyde after lithiation. A reasonable mechanism is proposed to elucidate the lithium storage behaviors referring to the electrocatalytic conversion of OH groups with Co nanocatalysts. This work can help further understand the contribution of SEI components (especially LiOH and LiAc) to lithium storage. It is envisaged that layered transition metal hydroxides can be used as advanced materials for energy storage devices.