首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
通过对北山地区金矿赋矿围岩——碳质板岩、浅变质含碳碎屑岩及主要载金矿物黄铁矿和石英的微量元素、稀土元素特征研究,认为北山地区金矿床是在含金建造的成矿物质基础上,经后期深源热液能量叠加的金矿床。  相似文献   

2.
β-环糊精对香兰素的包结特性研究   总被引:2,自引:0,他引:2  
研究了用β-CD包结香兰素的方法,并用X-射线衍射和红外光谱对包结物的结构进行了表征.用紫外分光光谱进一步证实了香兰素同环糊精之间形成了分子包结物,其包结比为1:1.在差热分析、吸氧实验及常温下稳定性实验结果的基础上,用对比分析的方法.证明了β-CD/香兰素包结物具有很好的抗氧化性、热稳定性和缓释效果.  相似文献   

3.
通过对撰山子金矿的矿床地质特征及矿床成因的研究,论述了其金矿床石英的形成时代,不同时代石英的基本特征,石英的包体成份特征,石英的红外光谱特征以及不同阶段的石英与含金性的关系,从找矿矿物学的角度为矿床的深部预测提供了依据。  相似文献   

4.
饱和萃合物是由一份0.1mol·L-1DOSO(1,2-二氯乙烷溶液)连续草取pH=1的PdCl2盐酸水溶液得到。元素分析结果表明草合物是Pd(DOSO)2Cl2。在DMF中测得Pd(DOSO)2Cl2摩尔电导为26.1Ω(-1)cm2mol(-1),属非电解质类型。X-射线分析证明Pd(DOSO)2Cl2是不同于PdCl2,DOSO以及它们的简单加合物的新物质。磁矩实验(μ(eff)=0)在明Pd(DOSO)2Cl2是平面正方形结构.中远红外光谱实验表明Pd(Ⅱ)是与DOSO中的S发生了配位,并且是反式配合物。此外。还对萃合物进行了热重(TGA),差示扫描热分析(DSC),熔点测定,不同溶剂中的溶解性能及稳定性的实验。  相似文献   

5.
将易于水解的AlCl_3和TiCl_4与交联聚苯乙烯小球(含DVB7%,粒度0.3~0.6mm)制成稳定的复合物,研究了该类载体催化剂存在下二茂铁甲醇的醚化反应及乙酰基二茂铁的缩酮化反应,对产物进行了元素分析、红外光谱及质子核磁共振谱表征.  相似文献   

6.
采用循环伏安法制备了邻苯二胺电聚合膜。研究了聚邻苯二胺(ODB)合成过程中单体浓度、扫描速率、溶液中氢离子浓度、电极材料、阴离子种类、聚合时间等对聚合电量的影响,提出了最佳聚合方案,即在0.015mol/LODB+0.4mol/LKCl+0.1mol/LHCl溶液中,以100mV·s-1的速率循环扫描50min。根据红外光谱初步推测:单体浓度低时可聚合形成类似吩嗪的桥式化学结构;而浓度高时形成1,2,4取代的链式结构。  相似文献   

7.
小秦岭地区含金石英脉数量众多,石英脉中的黄铁矿普遍含金。黄铁矿不仅集中了石英脉中金总量的92.08%,而且它的粒度越细、破碎越强烈,含八面体及五角十二面体晶形越多,则其中的含金量越高。黄铁矿的颜色,标型元素及矿物的其它标型特征可作为含金石英脉的有效找矿标志。  相似文献   

8.
借助于粒度分析、显微镜鉴定、X光粉晶衍射、差热、红外光谱等方法,对同安地区沉积型粘土的粒度、矿物成分进行测试.结果表明,该粘土为以高岭石和石英为主要组合的高岭石型粉砂质粘土.粘土矿物和石英的粒级范围和变化特征都完全不同.石英开始减少即粘土矿物开始增多.工艺上的淘洗率界限以下初始粒度是石英高值区和石英-粘土矿物重叠区,要提取高纯的粘土精矿,工艺上水洗界限必须降至0.005mm以下  相似文献   

9.
稀土(Dy,Gd)苯甲酸盐的红外和荧光光谱研究   总被引:1,自引:3,他引:1  
合成了系列苯甲酸-镝-钆混合稀土配合物.由元素分析确定其组成为(Dy_(1-x)Gd_x)L_3(L=C_6H_5COO ̄-),通过FT-IR光谱和荧光光谱研究了配合物中羧酸根离子红外吸收峰的特征和荧光发射光谱的特征.配合物的红外光谱表明,在三个羧酸根中,至少有一个羧酸根是通过螯合-桥式混合配位形式与稀土中心离子键合的.因此,Dy ̄(3+)离子在配合物中不是位于正八面体的中心,而是处于一个非对称中心的位置.配合物的荧光光谱表明,当DyL_3中部分Dy ̄(3+)离子被Gd ̄(3+)离子取代时,Dy ̄(3+)离子的特征荧光发射强度得到较大提高.  相似文献   

10.
CaO—BaO—SiO2—TiO2系统溶胶涂液的制备和凝胶化过程   总被引:1,自引:1,他引:0  
采用溶胶-凝胶工艺制备0.1CaO-0.1BaO-XSiO2-(0.8-X)TiO2和YCaO-(0.3-Y)BaO-0.3SiO2-0.4TiO2(X=0~0.5,Y=0~0.3摩尔分数)两组四元系统浸涂液。根据粘度变化和凝胶时间研究了组成、水和醋酸加入量对溶胶涂液稳定性的影响,得出了配制稳定期长的浸涂液的配比。利用红外光谱和X-射线衍射(XRD)探讨溶胶形成过程和凝胶向玻璃态转变过程中的结构变化。结果表明:溶液中CH3COO-取代醇盐中的OR基团分别与Si4+和Ti4+配位,形成反应活性不同于原醇盐的新的前驱体醇盐;经500°C热处理后凝胶的红外光谱中出现由Ti—O—Si伸缩振动所引起的吸收带。XRD谱证实60°C干凝胶中有醋酸盐晶体,500°C热处理后,这种晶体消失,凝胶中生成Ba2TiO4晶相。  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.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  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 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   

15.
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   

16.
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   

17.
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   

18.
正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-  相似文献   

19.
We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-  相似文献   

20.
正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号