Self-assembly of Carboxyl Functionalized Polystyrene Nanospheres into Close-packed Monolayers via Chemical Adsorption

The polyacrylic acid functionalized polystyrene nanospheres were synthesized and self-assembled into irregular, densely packed monolayers in non-aqueous media. The polymer nanoparticles were chemically adhered to substrates. The morphologies of the resulting films were investigated. The impact of the volume fraction of alcohol in the mixed solvents on the particle adsorption and fabrication of nanosphere assembled films was examined.     

O～3岁儿童微量元素检测及纠正150例观察与体会

对西安地区150例0～3岁儿童进行了六种微量元素：钙、锌、铜、铁、镁、硒的检测，发现微量元素缺乏可导致急慢性感染、免疫力低下、小儿营养不良、贫血、发育迟缓等症状。并对小儿营养不良、喂养不当进行矫正。其中铁、钙、锌同时缺乏占50％。     

淫羊藿根与叶活性成分的分析和比较

采用细胞膜色谱法（ＣＭＣ）筛选，并结合离体药理实验确定主要活性成分，利用高效液相色谱法分析比较了淫羊藿根与叶中的活性成分及其差异性．色谱条件为Ｋｒｏｍａｓｉｌ ＯＤＳ 柱（１５０ ｍｍ× ４．６ ｍｍ．Ｉ．Ｄ ）流动相甲醇－水（７０：３０，Ｖ：Ｖ）；检测波长２７０ｎｍ。筛选发现淫羊藿根中的两个有效成分ＹＹＨ－２１４和ＹＹＨ－２１６对血管有较强的舒张作用，表明活性成分在ＣＭＣ模型体系中的保留特性与药理作用之间存在良好的相关性。在此色谱条件下淫羊藿叶未检测到这两种活性成分．     

FTIR-ATR技术研究聚氨酯类文物保护材料的光降解

Polyurethanes are one kind of relic protection materials commonly used. During artificial photo-ageing, three polyurethanes, HDI-based polyurethane, MDI-based polyurethane and TDI-based polyurethane, have been considered to undergo UV radiation. Photochemical degradation of the polyurethanes has been monitored by means of Fourier transform infrared spectroscopy with attenuated total reflection accessory （FTIR-ATR）. It was proved that the mechanism of the photochemical degradation of polyurethanes might be the scissions of carbamate （urethane） groups and the re-reactions of radical groups formed in the scission reactions. From the experiment results HDI-based polyurethane, an aliphatic diisocyanate, could be considered to be more suitably used as relic protection materials among these three polyurethanes for its ageing products with less color.     

氧弹燃烧灰化法测定有机物中磷

用氧弹燃烧法灰化有机物进行元素测定，操作简便，快速，无污染，该方法用于有机物中磷的分析，结果可靠。     

Analysis and Protection of One Thousand Hand Buddha in Dazu Stone Sculptures

The components of the rock, the pigments, the gold foils and the adhesive of One Thousand Hand Buddha in Dazu stone sculptures, Chongqing, China, have been analyzed by X-ray diffraction (XRD), X-ray fluorescence (XRF), infrared spectroscopy (IR), energy dispersive X-ray analysis (EDX) and fiber optics reflectance spectroscopy (FORS). Furthermore, the weathering and degeneration of One Thousand Hand Buddha have been discussed and the protective methods have been provided. In this work some useful information to study on conservation of stone relics is given.     

功能性马丙共聚物树脂富集-分光光度法测定痕量铁(Ⅲ)

建立了功能性马来酸酐、丙烯酰胺共聚物树脂P(MA-AM)富集-分光光度法测定痕量Fe(Ⅲ)的新方法。考察了树脂对痕量Fe(Ⅲ)的吸附、洗脱行为。结果表明,在pH=3.5时,P(MA-AM)能富集Fe(Ⅲ),吸附30min时,最大吸附率达98.7%;以3.0mol/L的HCl作为洗脱液,Fe(Ⅲ)的回收率为96.2%;富集倍数可达20倍。该方法的检出限为0.02mg/L,相对标准偏差为3.0%,回收率范围为93.3%～97.6%。方法可应用于实际样品中痕量Fe(Ⅲ)的测定。     

基于水解-沉淀形态分布的金属盐混凝过程关键因子解析

水解-沉淀是无机金属盐能够发挥混凝作用的关键过程.金属盐的价态、浓度、配体浓度以及水的pH均对混凝性能有着重要影响.为准确对比各种无机金属盐作为混凝剂的优劣势和适用范围,本文通过热力学平衡常数的计算,并与混凝实验相结合,解析和验证了铝、铁、钛和锆4种金属的无机盐在有/无配体情况下的沉淀区域图和水合/水解物种的形态分布,...     

3 GPa熔融盐固体介质三轴高温压力容器的轴压摩擦力标定

 在温度标定和围压标定的基础上,采用轴压循环方法,对3 GPa固体介质三轴高温高压实验系统的轴压摩擦力进行了标定,分析了围压、温度、轴向位移速率、装样方式（盐套类型）等实验条件对轴压摩擦力的影响。结果表明：静摩擦力、挤压摩擦力和滑动摩擦力3种轴压摩擦力对轴向应力的影响不同,其中静摩擦力和挤压摩擦力对轴向应力的影响很小,影响应力精度的主要是滑动摩擦力。静摩擦力及滑动摩擦力与围压正相关;静摩擦力与轴向位移速率正相关,但受其影响较小,滑动摩擦力不受其影响;静摩擦力和滑动摩擦力与温度负相关,并且受其影响较显著;盐套类型对轴压摩擦力的影响较大,当实验条件接近盐套熔点时,轴压摩擦力显著降低,当样品周围的盐套处于熔融状态时,轴压摩擦力最小。基于此,确定了标定轴压摩擦力的具体步骤,并对角闪岩的应力-应变曲线进行了轴压摩擦力标定。对比轴压摩擦力校正前、后的应力-应变曲线发现,经过轴压摩擦力校正的应力-应变曲线能更好地反映样品的实际变形情况。     

例说建构递归关系证明不等式的模式

众所周知 ,因题而异证明不等式的方法甚多 ,本文旨在介绍一种证明不等式的新方法———建构递归关系法 .为简明见 ,本文举三个例题说明三种典型的建构递归关系证明不等式的模式 .1　建构递归关系模式Ⅰ例 1　在△ＡＢＣ中 ,试证 : ｓｉｎＡ≤332 .(其中和号 关于Ａ ,Ｂ ,Ｃ轮换 ,下同 )证　先证 ｓｉｎＡ≤ ｓｉｎπ -Ａ2 .事实上ｓｉｎＡ ｓｉｎＢ =2ｓｉｎＡ Ｂ2 ｃｏｓＡ -Ｂ2≤ 2ｓｉｎＡ Ｂ2=2ｓｉｎπ -Ｃ2 (1)同理 :ｓｉｎＢ ｓｉｎＣ≤ 2ｓｉｎπ -Ａ2 (2 )ｓｉｎＣ ｓｉｎＡ≤ 2ｓｉｎπ -Ｂ2 (3)由 (1) (2 ) (3)整理得 …