便携式岩样核磁共振分析仪磁体的设计

核磁共振中的磁体设计有许多方案，但是要使磁体体积小、重量轻、均匀区大、稳定性好，将面临一系列的问题. 而这些问题的解决主要依赖于电磁场计算. 文中首先阐述这些问题，然后对方案进行优化分析计算，从中找出一个最佳的解决方案. 采用本方案研制出来磁体，我们研制成功了便携式核磁共振岩样分析仪. 经过多次的现场实验测试表明由该磁体构成的磁共振岩样分析仪的稳定性高、重复性好、满足现场恶劣的环境要求.     

用示波器研究铁电材料的特性

本文介绍了一种用示波器研究铁电材料极化特性的实验方法，给出了定时讨论极化强度和电场强度的具体步骤，进而可测出矫顽力和剩余极化强度。     

FAAS测定人发中钙时样品所需稀释倍数的研究

火焰原子吸收测定人发中Ca,当加入锶盐为释放剂时,经实验得知:样品需稀释500倍以上方能得出正确的结果。     

Ultrasound responsive organogels based on cholesterol-appended quinacridone derivatives with mechanochromic behaviors

A series of cholesterol-appended quinacridone (QA) derivatives 1a-1d have been synthesized,in which 1b and 1c could form stable organogels in a wide range of organic solvents upon ultrasound irradiation.Field emission scanning electronic microscope (FESEM) and transmission electron microscopy (TEM) of xerogels or precipitates indicated that 1b and 1c formed 1D fibrous nanostructure,while 1a assembled into 3D flower-like microstructures.The ultrasound-induced organogel process was characterized by kinetic UV...     

水介质条件下油页岩热解机理研究

利用高压釜反应装置,对柳树河油页岩进行了饱和水和不饱和水介质条件下的热压模拟实验,研究了两种条件下油页岩热解产物(气体、油和热沥青)的生成机理.实验结果表明,在油页岩的热解过程中,同时经历自由基反应和碳正离子反应.水在高温的物化性质较在常温常压时发生了巨大的变化,具有酸催化剂和碱催化剂的作用,促使按碳正离子机理进行反应...     

多组分粘稠性聚合物的FT—IR光谱涂片定量法

应用光谱减(Subtract)程序,将混合化合物中的“标志谱带”进行光谱自身加减,从而使不等厚度涂片样调整到等厚度。然后用Specfit程序定量,其均方误差在0.0011～0.0193之间。     

Efficient Syntheses of 2-Substituted Benzimidazoles and Benzoxazoles from β-Keto Esters

An efficient synthetic method was developed to synthesize 2-substituted benzimidazoles and benzo- xazoles with β-keto esters as starting materials under mild reaction conditions, during which other functional groups are bearable from reactants to products.     

Non-isothermal Kinetics of the Dehydration Process of Na_2MoO_4·2H_2O

Introduction In the field of thermal analysis kinetics, there have been many kinetic models and methods of processing the corresponding data, which can depict the most probable kinetic mechanism of solid state reactions, such as the method combining differential and integral methods,1-6 the method combining isothermal and non-isothermal processes7,8 and method of TA curve shape,9,10 and so on. Recently, based on the predeces-sor抯 work, a more complete kinetic method of process-ing thermal ana…     

分形在油气田开发中的应用

分形用于测井资料分析，为油藏描述提供了新的工具，使得利用油藏数值模拟来模拟复杂结构的油气藏变得更加便利；分形油藏上的试井分析解决了一些以前难以解释的问题；用分形来描述裂缝和孔洞结构，提高了酸化压裂的设计水平；用分形理论来描述两相流，揭示了部分粘性指进的触发机理．总之，分形理论在油气田开发中的应用，促进了渗流力学基础理论的发展．     

Hydrothermal synthesis, structure and photocatalytic property of nano-TiO_2-MnO_2

TiCI4 and MnSO4.H2O as raw materials are hydrolyzed stiochiometrically, following the intermediate of oxide hydrating reacts at 150℃, 0.5 MPa in high-pressure reactor, after filtering, washing and drying, nanometric TiO2-MnO2 (Ti1-xMnxO2) is prepared. The effects of the reaction temperature and time on nanometric TiO2-MnO2 are also discussed. XRD shows that the product is TiO2-MnO2 with amorphous phase. After being sintered at above 780℃, it transfers into Ti1-xMnxO2 with a rutile structure. TEM shows that TiO2-MnO2 is the spherical particle. And the average diameter of the particles is 20 nm. The optical absorbance was determined by UV-265 spec-trophotometer after dispersing the sample in the mixture of water and glycerol with the ratio of 1 : 1 equably. It is found that the nano-material possesses the advantages of both nano-TiO2 and nano-MnO2, and it has strong absorption in the UV and visible region. Photodegradation of dyes in an aqueous solution is investigated using nanometricTiO2-MnO2 as a pho