用废聚苯乙烯泡沫制备胶粘剂   总被引：1，自引：0，他引：1  

李金华 《吉林地质》2003,22(1):58-61

本文研究了回收废旧聚苯乙烯(PS)泡沫塑料制备PS胶粘剂的方法。以废旧聚苯乙烯泡沫塑料为主要原料,选择低毒性、相溶性好的有机溶剂,使其溶解,再与聚乙烯醇(PVA)水溶液共混,制得水包油乳液。加入不同改性材料,制得改性胶粘剂。  相似文献   

剥片高岭土的有机改性   总被引：12，自引：0，他引：12  

孙红  刘志强  单永奎  何鸣元 《矿物学报》2003,23(2):97-101

用醋酸钾进行插层形成高岭土—醋酸钾复合体。通过X射线检测，高岭土层间距明显增大。将此复合体通过水洗，除去醋酸钾，高岭土即被剥片。剥片后高岭土粒径变小，但保持了高岭土的基本层状结构。用偶联剂对剥片后高岭土进行有机改性，形成高岭土有机复合物。“有效活化指数”的测定实验表明，利用此种方法制备的剥片高岭土有机改性效果很好。  相似文献   

改性碳酸氢铵的结构特征及其肥效增效机理研究     

吴平霄  廖宗文 《矿物岩石》2003,23(2):113-116

利用有机-无机(矿物)控释材料对碳酸氢铵进行改性，制成改性碳酸氢铵。盆栽试验结果显示，在等重条件下，改性碳酸氢铵较普通碳酸氢铵有较大幅度的增产。运用X射线衍射分析及红外光谱对改性碳酸氢铵的结构进行研究，发现其晶体结构发生较大的变化，差热分析结果也表明，改性碳酸氢铵的热分解温度比普通碳酸氢铵提高30℃。这种晶体结构的变化增加了改性碳酸氢氨的稳定性，从而延长了其肥效并提高了N的利用率。  相似文献   

预应力管桩单桩竖向极限承载力分析   总被引：8，自引：3，他引：8  

李连营  路清 《岩土工程技术》2003,(4):220-223

通过天津地区几例预应力管桩的静载荷试桩结果 ,分析天津地区预应力管桩单桩竖向极限承载力标准值的估算及与《建筑桩基技术规范》(JGJ 94— 94)和天津市《岩土工程技术规范》(DB 2 9— 2 0— 2 0 0 0 )的差别  相似文献   

天然含钒金红石加热、淬火及电子辐射改性实验研究   总被引：4，自引：5，他引：4       下载免费PDF全文

刘娟鲁安怀  郭延军李宁  李巧荣郑佳 《岩石矿物学杂志》2003,22(4):339-344

天然含钒金红石样品经过1273K加热、淬火和高能电子辐照处理后性质发生不同程度的变化。XRD谱峰显示处理前后样品没有发生物相变化，显微IR图谱证明原样、加热、淬火样品的表面有少量吸附水存在，而辐射样品的显微IR图谱上没有检测到吸附水的吸收峰。用XPS分析比较了处理前后样品表面主要元素Ti、O和V的价态及含量，结果表明，原样经过处理后表面钒和氧的原子百分含量增加，其中淬火样品表面吸附水和钒的含量相对于原样增加最为明显，光催化活性相应较高；加热样品表面的吸附水和钒的含量比原样稍有增加，光催化活性与原样相当；电子辐射样品表面钒的原子百分含量相对原样增加不明显，而对水的吸附能力相对原样较低，光催化效率也略低。  相似文献   

几种常见矿物的接触角测定及其讨论   总被引：4，自引：0，他引：4       下载免费PDF全文

陆现彩  侯庆锋尹琳赵连泽  刘显东 《岩石矿物学杂志》2003,22(4):397-400

为了评价矿物表面与特征液体的界面能量，分别测定了长石、石英、黑云母、方解石、萤石和黄铁矿等7种常见矿物与水、正庚烷和正丁醇的接触角，并计算了相应的表面自由能。结果表明同一矿物不同结晶面(晶面)的接触角有一定的差异，这一差异与矿物结构面上原子种类和相对含量差异有一定的对应关系。  相似文献   

多孔结构矿物（岩石）及其环境修复材料的实用性   总被引：12，自引：1，他引：12       下载免费PDF全文

尹琳 陆现彩胡欢  赵连泽赵波 《岩石矿物学杂志》2003,22(4):405-408

具有多孔结构的矿物(岩石)作为一类特殊的工业原材料，在环境修复领域的应用前景正在成为研究热点。本文从微孔的尺度、结构、形态、成分等表面固体特征出发，概括性地论述了凹凸棒石、海泡石、蒙脱石、沸石、硅藻土等十几种多孔结构矿物(岩石)在环境修复工程中用作过滤材料、吸附剂、离子交换剂和催化剂等材料时的基本特征和使用时应注意的问题。  相似文献   

数字签名技术在测绘信息安全中的应用设想     

梁肖 《地理空间信息》2003,1(1):24-26

随着空间技术、计算机技术和信息技术以及通讯技术的发展,基于Internet技术的地理信息系统———WebGIS应运而生。利用现代化的网络资源,进行测绘信息的网络传输,面临着安全问题的困绕。本文提出了使用数字签名技术,解决测绘网络信息安全问题的设想。  相似文献   

Theoretical Study on Stochastic Modeling of Combined Gravity-Magnetic-Electric-Seismic Inversion and Its Application     

YanHanjie YanHong LiYunping ZhangXiaofeng 《中国地质大学学报(英文版)》2003,14(3):227-233

As gravity field,magnetic field,electric field and seismic wave field are all physical fields,their object function,reverse function and compound function are certainly infinite contiuously differentiable func-tions which can be expanded into Taylor (Fourier) series within domain of definition and be further reduced in-to solving stochastic distribution function of series and statistic inference of optimal approximation,This is the basis of combined gravity-magnetic-electric-seismic inversion built on the basis of separation of field and source gravity-magnetic difference-value(D-value)trend surface,taking distribution-independent fault sys-tem as its unit,depths of seismic and electric interfaces of interests as its corresponding bivariate compound re-verse function of gravity-magnetic anomalies and using high order polynomial(high order trigonometric func-tion)approximating to its series distribution,The difference from current dominant inversion techniques is that,first,it does not respectively create gravity-seismic,magnetic-seismic deterministic inversion model from theoretical model,but combines gravity-magnetic-electric-seismic stochastic inversion model from stochastic model;second,after the concept of equivalent geological body being introduced,using feature of independent variable of gravity-magnetic field functions,taking density and susceptibility related to gravity-magnetic func-tion as default parameters of model,the deterministic model is established owing to better solution to the con-tradictioc of difficulty in identifying strata and less test analytical data for density and susceptibility in newly explored area;third,under assumption of independent parent distribution,a real modeling by strata,the prob-lem of difficult plane closure arising in profile modeling is avoided,This technology has richer and more detailed fault and strata information than sparse pattern seismic data in newly explored area,successfully inverses and plots structural map of Indosinian discontinuty in Hefei basin with combined gravity-magnetic-electric-seismic inversion,With development of high precision gravity-magnetic and overall geophysical technology,it is certain for introducing new methods of stochastic modeling and computational intelligence and promoting the develop-ment of combined gravity-magnetic-electric-seismic inversion to open a new substantial and promoting the develop-ment of combined gravity-magnetic-electric-seismic inversion to open a new substantial path.  相似文献   

Amplitude—Phase Characteristics of the Annual Cycle of Surface Air Temperature in the Northern Hemisphere   总被引：2，自引：0，他引：2  

Alexey V.ELISEEV  Igor I. MOKHOV 《大气科学进展》2003,20(1):1-16

The amplitude-phase characteristics(APC)of surface air temperature(SAT)annual cycle(AC)in the Northern Hemisphere are analyzed.From meteorological observations for the 20th century and meteorological reanalyses for its second half,it is found that over land negative correlation of SAT ACamplitude with annual mean SAT dominates.Nevertheless,some exceptions exist.The positive correlationbetween these two variables is found over the two desert regions:in northern Africa and in Central America.Areas of positive correlations are also found for the northern Pacific and for the tropical Indian and PacificOceans.Southward of the characteristic annual mean snow-ice boundary (SIB) position,the shape ofthe SAT AC becomes more sinusoidal under climate warming.In contrast,northward of it,this shapebecomes less sinusoidal.The latter iS also found for the above-mentioned two desert regions.In theFar East(southward of about 50°N),the SAT AC shifts as a whole:here its spring and autumn phasesoccur earlier if the annual  相似文献