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1.
菠萝香气成分的GC/MS分析   总被引:1,自引:0,他引:1  
采用固相微萃取(SPME)方法提取成熟菠萝的芳香物质,经气相色谱-质谱联机(GC/MS)分析,结合计算机检索技术对分离化合物进行鉴定,应用色谱峰面积归一法测定各成分的相对含量。检测结果表明:共鉴定出29种芳香物质成分,约占总峰面积的91.53%,其中分离出烃类(8种,27.6%)、酯类(8种,27.6%)、酮类(3种,10.3%)、醇类(3种,10.3%)、醛类(2种,6.8%),还有酚、呋喃、酸、杂环、胺类各一种各占3.4%。为进一步评价菠萝品质和利用芳香物质提供基础数据。  相似文献   
2.
Wang J  Liu K  Sun G  Bai J  Wang L 《Analytical chemistry》2006,78(3):901-904
Asymmetric transformation reaction of L-histidine to D-histidine was studied by homemade capillary array electrophoresis for the first time. The enantiomeric excess value of asymmetric histidine products can be directly determined from the electrophoretogram of capillary array electrophoresis. The experiment results showed that the optimized asymmetric transformation reaction condition was in the presence of salicylaldehyde as catalyst and acetic acid as solvent.  相似文献   
3.
介绍了现有的工业化应用烟气脱硫脱硝技术,结合对焦炉烟道气参数及组分的研究,提出了焦炉烟道气脱硫及中低温脱硝的技术路线,并介绍了焦炉烟道气脱硫脱硝中试试验内容及结果,提出了焦炉烟道气净化解决方案。  相似文献   
4.
On the basis of reported experimental vapor-liquid equilibrium (VLE) data of NH3-1-ethyl-3-methylimidazolium acetate (NH3-[Emim]Ac), NH3-1-butyl-3-methylimidazolium tetrafluoroborate (NH3-[Bmim][BF4]), NH3-1,3-dimethylimidazolium dimethyl phosphate (NH3-[Mmim]DMP) and NH3-1-ethyl-3-methylimidazolium ethylsulfate (NH3-[Emim]EtOSO3) binary systems, the interaction parameters of 14 new groups have been regressed by means of the UNIFAC model. To validate the reliability of the method, these parameters have been used to calculate the VLE data with the average relative deviation of pressures of less than 9.35%. The infinite dilution activity coefficient ( γ1∞ ) and the absorption potential ( φ1 ) are important evaluation criterions of the affinity between working pair species of the absorption cycle. The UNIFAC model is implemented to predict the values of and φ1 of t6 sets of NH3-ionic liquid (1L) systems. The work found that the φ1 gradually increases following the impact order: φ1([Cnmim][BF4])〈φ1([Cnmim]EtOSO3)〈φ1([Cnmim]DMP)〈φ1([Cnmim]Ac) (n= 1, 2, 3, … ) at a given cation of IL species and constant temperature, and φ1([Mmim]X)〈φ1([Emim]X)〈φ1([Pmim]X)〈 φ1([Bmim]X)(X= Ac, [BF4], DMP or EtOSO3) at a given anion of IL species and constant temperature. Furthermore, the φ1 gradually increases with increasing temperature. Then, it could be concluded that the working pair NH3-[BmimlAc has the best potential research value relatively.  相似文献   
5.
李永明  孙光明 《施工技术》2012,41(14):156-158
河南广播电视发射塔外塔柱采用巨型桉叶糖形钢管柱,其截面形式特殊,板件宽厚比大,且外塔柱均采用法兰连接。通过对桉叶糖形管体的试验,将原设计方案中的焊接量降低了一半,既保证了构件质量又缩短了生产加工周期。笔者对外塔柱连接法兰加工制作、桉叶糖管体加工、管体的焊接、管体与法兰的组装、管体的对接等施工工艺进行详细阐述。  相似文献   
6.
基于JSON的Ajax数据通信快速算法   总被引:1,自引:0,他引:1  
针对Ajax采用XML作为数据载体存在标签大量冗余、基于DOM解析复杂导致数据传输量大、服务器与客户端解析效率低的问题,提出一种基于JSON的Ajax数据通信快速算法.分析服务器端应答Ajax引擎请求数据的结构,设计有限状态机模型实现应答数据集转换为JSON格式的方法,提高了Ajax数据传输和解析的效率.实验结果表明,该算法较以XML为数据载体的通信速度更快,解析效率更高,具有更好的用户体验度.  相似文献   
7.
本文是作者结合多年工作经验,主要针对目前公路混凝土路面施工质量问题作出了相关的阐述分析。以供参考。  相似文献   
8.
协作模型是设计多平台作战计划制定系统的关键技术之一,文章提出了协作过程冲突的几种典型模式,利用Petri网的过程仿真方法,设计并验证了解决冲突的协作模型,认为协作模型不能解决所有冲突问题,在协作模型与业务模型中分别处理协作制定的冲突问题是系统设计的有效方法。  相似文献   
9.
A homogeneous dispersion of multi-walled carbon nanotubes (MWCNTs) in syndiotactic polystyrene (sPS) is obtained by a simple solution dispersion procedure. MWCNTs were dispersed in N-methyl-2-pyrrolidinone (NMP), and sPS/MWCNT composites are prepared by mixing sPS/NMP solution with MWCNT/NMP dispersion. The composite structure is characterized by scanning electron microscopy and transmission electron microscopy. The effect of MWCNTs on sPS crystallization and the composite properties are studied. The presence of MWCNTs increases the sPS crystallization temperature, broadens the crystallite size distribution and favors the formation of the thermodynamically stable β phase, whereas it has little effect on the sPS γ to α phase transition during heating. By adding only 1.0 wt.% pristine MWCNTs, the increase in the onset degradation temperature of the composite can reach 20 °C. The electrical conductivity is increased from 10−10∼−16 (neat sPS) to 0.135 S m−1 (sPS/MWCNT composite with 3.0 wt.% MWCNT content). Our findings provide a simple and effective method for carbon nanotube dispersion in polymer matrix with dramatically increased electrical conductivity and thermal stability.  相似文献   
10.
Debundling and dispersion of carbon nanotubes (CNTs) are very important for preparation of polymer/CNT nanocomposites. In the present study, a self-prepared gemini surfactant, 6,6′-(butane-1,4-diylbis(oxy))bis(3-nonylbenzenesulfonic acid), is employed to achieve homogeneous and stable dispersion of multi-walled carbon nanotubes (MWNTs) in organic solvent and subsequent polystyrene (PS)/MWNT nanocomposite. Sedimentation, optical microscopy and transmission electron microscopy studies demonstrate that the gemini surfactant can greatly improve the dispersion and stabilization of MWNTs in toluene. Scanning electron microscopic images clearly confirm the homogenous dispersion of individual MWNTs in PS. In addition, desired enhanced electrical conductivity and thermal stability of the nanocomposite relative to those of the neat PS are obtained.  相似文献   
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