超临界CO_2脱卵黄油及卵黄磷脂提取的研究

对超临界CO_2流体萃取卵黄磷脂及其机制进行了研究,超临界CO_2在丙酮和瓷粉作用下,在35MPa、40℃条件下萃取3h,可脱除蛋黄粉中98.6％的卵黄油。在40MPa、50℃条件下,用10wt％乙醇夹带,卵黄中磷脂的提取率最高,为27.28％。     

气相色谱法测定水果保鲜期中的二氧化碳

本文用气相色谱仪热导池检测器和活性碳柱测定水果在保鲜期新陈代谢过程中放出的二氧化碳.当柱温在150℃,桥电流90mA时,二氧化碳出峰时间仅为1.27分钟.本法操作方便,使测试结果的准确度有所提高.     

CO2在p—SiC膜电极上的光电化学还原

近年来,CO_2的光电化学还原引起人们极大的兴趣,已有利用SiC粉末进行CO_2光催化还原的报道。本研究首次利用p-SiC膜光阴极还原CO_2,得到较高的CH_3OH产率。1 实验 在导电玻璃上采用水银光敏化CVD法制得微晶p-SiC膜,电极表面用4.6％HF溶液抛     

Heterogeneous reactions on the surface of fine particles in the atmosphere

Fine particles play an important role in the atmosphere. Research on heterogeneous reactions on the surface of fine particles is one of the frontier areas of atmospheric science. In this paper, physical and chemical characteristics of fine particles in the atmosphere and the interactions between trace gases and fine particles are described, methods used in heterogeneous reactions research are discussed in detail, progress in the study of heterogeneous reactions on the surface of fine particles in the atmosphere is summarized, existing important questions are pointed out and future research directions are suggested.     

Sol-gel Method Synthesized Polyhedron SnO_2 Anode Material for Lithium Ion Battery

1 Introduction Tin-based oxides will be promising anode materials for lithium ion batteries due to its high specific capacity, low potential platform, and safety[1]. Many methods have been applied to synthesize SnO2 materials of different morphologies, such as chemical vapor deposition, spray, sol-gel method[2]. Triblock copolymer poly (ethylene oxide)-block-poly (propylene oxide)-block-poly (ethane oxide) (P123) has been used as surfactant to prepare nano-crystalline tin oxide particles[3]. In this pap...     

乌鲁木齐二氧化硫污染成因分析及对策

文章通过对乌鲁木齐二氧化硫污染进行分析，得到乌鲁木齐市二氧化硫的城市中心区〉居民区、游憩区和文教区〉新市区的分布规律，乌鲁木齐特殊的地形地貌、气象气候条件和区域环境对二氧化硫污染的形成有重要作用.根据乌鲁木齐自身特殊的情况，提出相应的解决对策.     

二氧化碳在金属丝网的毛细动力学实验与分析

二氧化碳(CO2)作为制冷剂具有环保及良好的热力特性,已经越来越受到重视,并将率先应用在航天毛细驱动的两相循环冷却技术(CPL)和环路热管(LHP)中,但是由于它的工作压力较高,对其毛细动力特性研究还没有实验支持。文章的目标是通过实验测量CO2在不锈钢丝网爬升的动态结果,进行毛细上升的动力学分析,并将实验结果与几个经典的公式进行比较,找出最佳适用公式。     

Visible light photocatalytic decoloration of methylene blue on novel N-doped TiO2

Novel N-doped TiO2 (denoted as N-NTA600) was prepared by treating nanotube titanic acid (NTA) in NH3 flow. Its visible light photocatalytic activity,evaluated by decoloration reaction of methylene blue,is higher than that of N-P25(600) prepared by treatment of P25-TiO2 in the same condition. It is suggested that the origin of visible-light photocatalytic activity is single-electron-trapped oxygen vacancy (Vo·) modified by chemisorbed NO.     

神经外科手术中动脉与呼气末二氧化碳分压差稳定性的观察

观察神经外科手术过程中动脉和呼气末二氧化碳分压差值（Ｐａ－ＥＴＣＯ２）的稳定性。对３０例幕上肿瘤行择期肿瘤切除术的患者，于硬脑膜打开后，给予安氟醚１．１～１．５ＭＡＣ，将动脉内压维持在每小时１０±０．６７ｋＰａ。分别于麻醉前、气管插管后５ｍｉｎ、开颅后５ｍｉｎ、术中降压１ｈ和术终抽取动脉血行血气分析。对开颅超过３ｈ的１４例患者，则于３ｈ后再抽取１次动脉血样，同时记录呼气末二氧化碳分压（ＰＥＴＣＯ２）。在手术过程中ＰａＣＯ２平均值为４．２１±０．７７ｋＰａ，ＰＥＴＣＯ２平均值为３．８６±０．６６ｋＰａ，Ｐａ－ＥＴＣＯ２平均值为０．３３±０．６６ｋＰａ，ＰａＣＯ２与ＰＥＴＣＯ２显著相关（Ｐ＜０．０１）。ＰａＣＯ２、ＰＥＴＣＯ２和Ｐａ－ＥＴＣＯ２不同时间点之间无显著性差异。如能在麻醉后及早确定Ｐａ－ＣＯ２与ＰＥＴＣＯ２差值，术中监测ＰＥＴＣＯ２仍有一定价值