昌化鸡血石的宝石学研究

利用X射线粉末衍射仪、拉曼光谱仪、扫描电子显微镜、电子探针及岩石薄片对昌化鸡血石样品中"地"与"血"的矿物组成、形貌特征、化学成分等进行了研究.结果表明,昌化鸡血石"硬地""软地"与"冻地"的矿物组合不同;其中,"地"以地开石为主且呈鳞片状,随着石英的增加,特别是明矾石的加入,"地"的硬度变大."冻地"鸡血石中地开石的结晶粒度比"硬地"鸡血石中的大,但其空间定向性排列没有后者的好.昌化鸡血石中"血"由细小的半自形-他形辰砂微晶集合体组成,其"血"色与辰砂晶体的聚集状态及其杂质成分有关,而杂质成分又与Se元素的质量分数密切相关.     

随机建模在滴水泉区油藏描述中的应用

在新疆油田滴水泉滴12井区侏罗系八道湾组砂砾岩储层非均质建模中,针对储层描述的不确定性因素,利用井内外信息的随机性特点,综合运用测井数据、岩心描述数据、地震数据等多方面信息,以减少储层描述的不确定性。利用层序地层基准面旋回等时对比方法,进行单井单砂体细分对比,确定储层格架和沉积微相展布特点,建立地质数据库。在此基础上,用Petrel软件对该区块的油藏构造、沉积微相和油藏属性建立储层三维地质模型,从而使得油藏的非均质性描述和认识更为直观、合理,为油田增产提供了地质依据。     

酯交换法合成碳酸二苯酯的工艺研究

通过对碳酸二甲酯与苯酚酯交换法反应合成碳酸二苯酯的研究,寻找最佳的反应条件．实验结果表明反应在160～180℃下,苯酚、碳酸二甲酯与催化剂的摩尔比为4：1：0．016,反应时间为12h,碳酸二苯酯的产率可以达到40％以上,经碱洗、重结晶处理后纯度可以达到99．0％．     

Exploring the Steady Operation of a Continuous Pilot Plant for the Di‐Nitration Reaction

Continuous‐flow synthesis of the selective herbicide pendimethalin was demonstrated in both a laboratory‐scale and a pilot‐scale reactor using only concentrated nitric acid as nitrating agent. The di‐nitration reaction follows second‐order kinetics where the reaction is first order with respect to both reactant and nitric acid. The pinched‐tube reactor was chosen for pilot‐scale reactor fabrication due to its excellent mixing and mass transfer characteristics compared to a straight‐tube reactor. The estimated mass transfer coefficient showed similar nature in the laboratory‐scale and the pilot‐scale pinched‐tube reactor, ensuring similar performance at the pilot scale. Di‐nitration in continuous flow, inline quenching, extraction, and phase separation are some of the salient features of the developed pilot plant. The importance of the start‐up time for achieving steady state in the flow system at the large scale is highlighted.     

Concentration and survey of phthalic acid esters in edible vegetable oils and oilseeds by gas chromatography-mass spectrometry in China

Now, there is a lack of information regarding the occurrence and the content of phthalic acid esters (PAEs) contamination in edible vegetable oils and oilseeds used for oil production in China. In this study, a method for determination of five PAEs was developed based on gas chromatography-mass spectrometry. Method recoveries for oils and oilseeds were 72.4–103.0% and 77.2–98.8%, respectively. RSDs of five analytes in oils and oilseeds were ranging from 1.22 to 8.64% and 0.62–9.37%, respectively. The LODs and LOQs were ranging from 0.10 to 0.79 and 0.33–2.60 μg/kg, respectively. Based on the established method, PAE concentrations in thirty-four edible oils and twenty-eight oilseeds were evaluated. Five and thirteen oil samples exceeded the upper limits 1.5 and 0.3 mg/kg set for di(2-ethtlhexyl) phthalate and dibutyl phthalate in China, respectively. The results obtained indicated that more concern and comprehensive legislation are still needed and mulriple issues should be considered when it comes to the PAEs contamination in edible vegetable oils.     

A preliminary study of polymer inclusion membrane for lutetium(III) separation and membrane regeneration

This paper reports on the selective transport of Lu(III) from La(III) and Sm(III) through a polymer inclusion membrane (PIM) composed of 40 wt% di(2-ethylhexyl) phosphinic acid (P227) and 60 wt% poly(vinylidene fluoride) (PVDF). Basically, the changes in surface morphology, thickness and water contact angle of this PVDF-based PIM containing P227 (P227@PVDF PIM) with different polymer concentrations were investigated. By solvent extraction experiments, it is found that Lu(III) can be selectively extracted from La(III) and Sm(III) at pH 1.5 in hydrochloric acid solution. According to this result, P227@PVDF PIM was used to selectively transport Lu(III) from hydrochloric acid feed solution containing similar concentration of La(III) and Sm(III). The recovery factor of Lu(III) is 91% after 36 h, and about 5% of Sm(III) was also transported through the PIM. The concentration of La(III) in the feed solution and the stripping solution does not change. Furthermore, to overcome the ubiquitous decline of transport efficiency caused by the loss of carrier or the damage of membrane structure after long-term use of PIMs, a process for regenerating PIMs was first proposed and implemented. By comparison of the regenerated PIM with the normal PIM, there is almost no difference in the SEM image, ATR-FTIR spectrum and Lu(III) transport efficiency. It is expected that P227@PVDF PIMs have the potential to be applied to the grouped separation of rare earth elements (REEs), and this study also can be as an inspiration for the further study on the PIMs regeneration process.     

普通分光光度计进行双波长分光光度测定P_2O_5的研究

本文介绍一种用普通分光光度计附加简单装置进行双波长分光光度测定Ｐ_２Ｏ_５的新方法。选择适宜双波长消除背景吸光度的影响，测定磷钒钼黄络合物的差吸光度，不仅提高了仪器的稳定性和精度，而且简化了操作过程。Ｐ２Ｏ５的线性测定范围扩宽为２．０～１２．０ｍｇ／５０ｍｌ，相对误差小于１％。     

温润如玉——龙泉窑

龙泉窑系是中国宋代著名的六大窑系之一,其中哥窑又是宋代五大名窑之一。龙泉窑开创于两晋,兴于北宋,盛于南宋结束于清代,是中国历史上烧制年代最长、生产规模最大、外销地域最广、影响最大的窑系。龙泉窑烧制的青瓷以"青如玉、明如镜、薄如纸、声如磬"闻名于世。     

一种高性能的多光驱AUDIO光盘镜像及并行压缩算法

论文分析了光盘镜像和MPEG压缩分别占用系统IO和CPU的特点,将二者有机地结合,充分利用了系统的资源,提出了多个光驱同时镜像Audio光盘且并行压缩算法,并详细讨论了这个算法的设计与实现。     

新型化学萃取剂芳香族双叔胺类化合物——4,4’-亚甲基-双(2-乙基-N,N-二丁基苯胺)的合成

以氯霉素生产中的副产物邻硝基乙苯为原料,经铁酸还原和相转移催化Ｎ－烷基化反应合成了Ｎ,Ｎ－二丁基邻乙基苯胺（ＤＢＥＡ）。在酸性条件下将ＤＢＥＡ与甲醛缩合制得标题物（ＭＢＥＤＢＡ）。经红外光谱、核磁共振氢谱的谱图解析对其结构进行了确认。