聚丙烯酸酯降凝剂的溶液性质及其对含蜡油降凝效果的影响

对聚丙烯酸长链酯（ＰＡ）的结晶能力和溶液性质及其对两种含蜡油的降凝效果进行了研究,发现ＰＡ的结晶能力取决于ＰＡ侧链长度和相对分子质量,而其在溶液中形成冻胶或沉淀的温度（反映ＰＡ在溶液中的结晶能力）与ＰＡ本体的结晶能力有关,而ＰＡ对含蜡油的降凝效果则与ＰＡ在油中的结晶能力有关。研究结果表明,一种理想的ＰＡ降凝剂在油中的结晶能力应该与油中蜡的结晶温度相匹配     

不用水蒸汽的大气式热力除氧方法及应用

不用水蒸汽的大气式热力除氧法,是利用温度高于或等于１２５℃的余热,经表面式换热器将压力高于或等于０．４ＭＰａ的软水加热到１１０℃以上,软水进入除氧器后,因压力降低而沸腾,从而达到除氧的目的。采用此方法除氧,相当于将工艺余热的温度提高了３０～５０℃,节省了大量燃料,为企业中大量难以回收的１２５～１５０℃的低温热的利用开辟了新的途径。     

炸药冲击波激励氩气闪光实验研究

建立了对可见光和近红外的瞬态测试记录系统。用实验方法研究了氩气在炸药冲击小励下产生的可见光光强。测得了不同压力下氩气的辐射强度,分析了气体压力对光强的影响。     

顶底板围岩不稳的缓倾斜中厚以上矿体的采矿新方案

密集平行束孔落矿的底盘漏斗采矿方案的特点是:用密集严行束孔落矿;凿岩与出矿水平合二为一;实行“掘井、劈漏、落矿三位一体”的回采工艺。该方案结构简单、采切比低、工人劳动强度低,适于开采缓倾斜顶底围岩不稳固的中厚以上矿体。     

中药知母有效组分——知母皂甙元“滋阴”作用的研究

本工作以~(123)I-心得静结合分析法及环核苷酸RIA法观察了知母中提取得到的知母皂甙元对甲亢模型(模拟“阴虚”)βAR-cAMP系统的作和,结果表现,知母皂甙元明显降低甲亢小鼠脑β受体的RT值,显著降低甲亢小鼠β受体-cAMP系统的反应性,重现了知母水煎剂的下调作用。体外竞争抑制实验表明,知母皂甙元和知母皂甙元半琥珀酸都不能抑制~(125)I-心得静与β受体的结合。     

复合材料蜂窝夹层结构计算的一般方法和进展

本文对目前蜂窝夹层结构有限元分析的方法进行旭纳；对每一种计算模型中所包含的假设作一讨论；指出其适用范围，供设计和强度计算时参考。     

Determination of slip melting point in palm oil blends by partial least squares and principal component regression modeling of FTIR spectroscopic data

The determination of slip melting point (SMP) in refined, bleached, and deodorized palm oil is a common and regular requirement in the manufacture of this oil. An FTIR spectrometer in the mid-IR wavelength region (4000-750 cm⁻¹) can provide the basis for a suitable on-line and off-line quantitative analytical methodology if used with a suitable calibration model. In this study, by using data from selected regions, the calibration models, including principal component regression and partial least squares regression, have been examined and evaluated for efficacy in determining SMP directly in palm oil blends. Results indicate that orthogonal models using selected wavelength data offer superior predictive performance.     

A general approach to binary and ternary hybrid nanocrystals

We describe and demonstrate a general strategy for engineering binary and ternary hybrid nanoparticles based on spontaneous epitaxial nucleation and growth of a second and third component onto seed nanoparticles in high-temperature organic solutions. Multifunctional hybrid nanoparticles that combine magnetic, plasmonic, and semiconducting properties and that are tunable in size and morphology can be realized, as demonstrated for combinations of Au, Fe3O4 and PbS or PbSe. The properties of each component within the hybrids can be modulated strongly by the conjugating component(s) aided by the coherent interfaces between them.     

Silica coated noble metal nanoparticle hydrosols as supported catalyst precursors

Synthesis of well-defined nanoparticles has been intensively pursued not only for their fundamental scientific interest, but also for many technological applications. One important development of the nanomaterial is in the area of chemical catalysis. We have now developed a new aqueous-based method for the synthesis of silica encapsulated noble metal nanoparticles in controlled dimensions. Thus, colloid stable silica encapsulated approximately 5 nm platinum nanoparticle is synthesized by a multi-step method. The thickness of the silica coating could be controlled using a different amount of silica precursor. These particles supported on a high surface area alumina are also demonstrated to display a superior hydrogenation activity and stability against metal sintering after thermal activation.