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1.
研究了青石棉、温石棉、直闪石和铁石棉与不同度N,N-二甲基苯胺在110℃的吸附氧化反应,测定了产物的紫外可见光谱、红外光谱、元素分析和热分析数据,结果表明,四种石棉均能使DMA氧化为甲基紫,质子可以提高石棉的氧化能力,此外,反应过程还生成一种紫外可见光景大吸收为340nm的物质,其结构有待进一步鉴定。  相似文献   

2.
该文在四氯化碳介质中考察了苯乙烯对丙酮肟和N,N-二甲基甲酰胺(DMF)1HNMR谱的溶剂效应,观察到丙酮肟、DMF和苯乙烯的化学位移随苯乙烯的摩尔分数增加而逐渐移向高场,丙酮肟和DMF分子中的两个甲基向高场移动的程度不同,而且两个甲基和苯乙烯分子中的苯基的化学位移与混合溶剂中苯乙烯的摩尔分数呈线性关系.  相似文献   

3.
对N,N-二乙基二硫代氨基甲酸烯丙基酯(ADC)的^1H NMR谱,^13C NMR谱及H-^1H.^13C-^1H化学位移相关谱测定结果进行了讨论。对^13C NMR和^1H NMR谱峰作出了归属,并确认了ADC的链结构。  相似文献   

4.
本文研究了N-(O,O-二烷基)磷酰化丙氨酸(DRP-Ala)在温和条件下与多元醇的反应,经31P-NMR、FAWMS证实,发生了成肽,成酯和酯交换反应,并提出了相应的反应机理.  相似文献   

5.
给定(N-1)条边界曲线及其跨界导矢构造 N 边域曲面   总被引:1,自引:0,他引:1  
在CAD/CAM系统的曲面设计中,常常需要根据给定的(N-1)条边界曲线及其跨界导矢构造N边域曲面。通过将Coons曲面的设计思想和B样条方法相结合,对任意的N(N≥4)边域曲面,提出了一种根据给定的(N-1)条边界曲线及其跨界导矢构造边域曲面的新方法,讨论了所构造曲面奇异性的消除,研究了其向NURBS曲面的转换方法。这种方法的优点在于:1)N边域曲面整体C1连续;2)N边域曲面的跨界导矢可以独立给定,不需要满足兼容性条件;3)可以用N片NURBS曲面来形成与相邻曲面近似G1拼接的N边域曲面。由于NURBS已成为CAD/CAM系统中曲面的基本表示形式和数据转换的标准,从而本方法易于在现有的CAD/CAM系统中实现。  相似文献   

6.
N,N—二甲基—二烯丙基氯化铵的合成及其聚合反应   总被引:5,自引:0,他引:5  
以烯丙基氯、二甲胺和氢氧化钠为原料的一步法合成工艺,成功进行了DMDAAC单体的合成,研究了以水为介质,过硫酸铵为引发剂的DMDAAC水溶液聚合反应,探讨了引发剂浓度、单体浓度对聚合反应转化率及聚合物分子量的影响,并用IR和^1H-NMR进行了分析表征。  相似文献   

7.
以12-钨(钼)磷杂多酸为掺杂剂,合成了聚N,N-二甲苯胺,并利用ICP、元素分析、循环伏安、红外光谱及室温固体电导率的测定等手段进行了表征,结果表明,掺杂的PDMAn/PM12的室温导电率约为12-13S/cm。  相似文献   

8.
12—钨锗酸电荷转移配合物的合成,表征与光色性研究   总被引:3,自引:1,他引:2  
以吡啶(Py)、N,N二甲基苯胺(DMA)和12钨锗酸为原料,用化学法合成了两个新的12钨锗酸电荷转移配合物.用元素分析和热重分析确定它们的分子式为(HPy)3HGeW12O40·Py·2DMF和(HDMA)3HGeW12O40·DMA·2DMF.红外和紫外光谱表明有机电子给体与杂多阴离子间有强烈的相互作用,生成了电荷转移配合物.紫外可见光谱测试发现在645nm附近有一个新的吸收峰,对应于W(Ⅴ)→W(Ⅵ)的IVCT跃迁,结合极谱循环伏安测试,发现合成产物在光的作用下发生可逆的光还原反应.  相似文献   

9.
合成了N,N’-二乙基二硫代氨基甲酸苄酯(BDC)。在合成时,反应温度越高,反应时间越长,亲核取代反应越完全。以BDC作为iniferter引发St、MMA光聚合,单体St和MMA的转化率随光照时间的增加而增加,但没有呈现出严格的线性关系。此外,反应温度温度高,单体转化率增加;PS和PMMA的粘均分子量则随光照时间和增加而呈线性增加的关系,所得聚合物的分子量分布较宽。iniferterBDC可以进  相似文献   

10.
报道了两种4-N,N-二甲基偶氮苯-4’-磺酸酯衍生物的合成,获得了主客及侧链极化聚合物薄膜的d33值,它们分别高于目前较多的DR-1/PMMA,CEM-MMA的对应值,并探讨了其影响因素。  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

15.
Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.  相似文献   

16.
以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.  相似文献   

17.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

18.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

19.
Quality traits in wheat (Triticum aestirum L.) were studied by quantitative trait locus (QTL) analysis in a recombinant inbred line (RIL) population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross (ChSh). Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.  相似文献   

20.
赵英华 《科技信息》2008,(12):219-220
0.Preface China has long been boasting of its colorful and immense culture which comprises of Taoism,Confucianism and Buddhism.The interwoven influence among the religions on Chinese way of thinking,on the nation's behavior in their social life throughout the long history is beyond list.  相似文献   

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