New criterion in predicting glass forming ability of various glass-forming systems

It has been confirmed that glass-forming ability (GFA) of supercooled liquids is related to not only liquid phase stability but also the crystallization resistance. In this paper, it is found that the liquid region interval ($T_{\rm l}-T_{\rm g})$ characterized by the normalized parameter of $T_{\rm g}$/$T_{\rm l}$ could reflect the stability of glass-forming liquids at the equilibrium state, whilst the normalization of supercooled liquid region $\Delta T_{\rm x}$=($T_{\rm x}-T_{\rm g})$, i.e. $\Delta T_{\rm x}$/$T_{\rm x}$ (wherein $T_{\rm l}$ is the liquidus temperature, $T_{\rm g}$ the glass transition temperature, and $T_{\rm x}$ the onset crystallization temperature) could indicate the crystallization resistance during glass formation. Thus, a new parameter, defined as $\xi =T_{\rm g}$/$T_{\rm l}+\Delta T_{\rm x}$/$T_{\rm x}$ is established to predict the GFA of supercooled liquids. In comparison with other commonly used criteria, this parameter demonstrates a better statistical correlation with the GFA for various glass-forming systems including metallic glasses, oxide glasses and cryoprotectants.     

New criterion in predicting glass forming ability of various glass-forming systems

It has been confirmed that glass-forming ability （GFA） of supercooled liquids is related to not only liquid phase stability but also the crystallization resistance. In this paper, it is found that the liquid region interval （T1 - Tg） characterized by the normalized parameter of Tg/T1 could reflect the stability of glass-forming liquids at the equilibrium state, whilst the normalization of supercooled liquid region △Tx=（Tx - Tg）, i.e. △Tx/Tx （wherein T1 is the liquidus temperature, Tg the glass transition temperature, and Tx the onset crystallization temperature） could indicate the crystallization resistance during glass formation. Thus, a new parameter, defined as ζ = Tg/T1＋△Tx/Tx is established to predict the GFA of supercooled liquids. In comparison with other commonly used criteria, this parameter demonstrates a better statistical correlation with the GFA for various glass-forming systems including metallic glasses, oxide glasses and cryoprotectants.     

多维Erlang混合的次序统计量及其在多生命理论中的应用（英文）

本文研究来自多维Erlang混合分布的具有相关性的随机变量的次序统计量并将相关结论应用到多生命理论中.利用熟知的数学归纳法推导出次序统计量分布密度函数的解析表达式并证明其分布为一维Erlang混合分布,寿险精算理论中常见的重要统计量可以算出精确解.这一结论将随机变量相互独立情形下的结果推广到变量存在相关性的情形.     

高效液相色谱法测定染发剂中对苯二胺等32种染料组分

采用高效液相色谱法对甘肃27个市、州、县地区抽样的50批次染发剂类化妆品进行检验,分析染发类化妆品中使用的染料组分种类、含量情况.试验结果发现对苯二胺、间苯二酚、间氨基苯酚、对氨基苯酚等4种染料组分的使用频率较高.50批染发类化妆品不合格率为50%,其中包括未超规定限量,但产品的批件配方信息与包装标签标识存在问题的染发剂22批次,二批次检出禁用组分,一批次检出苯基甲基吡唑啉酮超规定限量.说明染发类化妆品产品包装标签应进行规范,产品的批件配方信息与包装标签标识的一致性应加强监管.     

超级微波消解-电感耦合等离子体质谱法测定化妆品中4种微量元素

依据超级微波消解-电感耦合等离子体质谱法(ICP-MS)对甘肃省内各个市、州、县地区在售的53批次粉状彩妆类化妆品进行检测,采用在线内标校正、外标法定量分析彩妆类化妆品中铅、砷、汞、镉等4种元素的含量情况. 在曲线浓度0~100 μg/L (Hg:0~5 μg/L) 时,样品检出限为0.000 016~0.004 6 mg/kg,线性相关系数均大于0.998 5,内标RSD小于5.0%,加标回收率为78.3%~104.8%. 试验结果表明,在同时测定粉状彩妆类化妆品中4种元素过程中,方法简便、快捷、省时、节约成本,并且灵敏度高、重现性好.