基于Pt/SAPO-11和Pt/ZSM-22催化剂的溶剂脱蜡油加氢异构反应

采用常规水热法合成SAPO-11和ZSM-22分子筛,制备分别含有分子筛的催化剂,借助XRD、SEM和NH3-TPD表征2种催化剂的结构和酸性,并以加氢预精制溶剂脱蜡油为原料,采用固定床反应器研究Pt/SAPO-11和Pt/ZSM-22催化剂的加氢异构反应性能.结果表明:催化剂的反应活性和选择性主要取决于催化剂的酸量和酸强度,相对而言,由于SAPO-11分子筛催化剂弱酸含量较高,具有更佳的异构化选择性.利用1HNMR和13CNMR核磁共振研究加氢异构反应前后基础油的化学结构变化,Pt/SAPO-11催化剂有较高的加氢异构选择性.     

湿热处理对壳聚糖/PVA共混膜结构和性能的影响

用流延法成功制备壳聚糖/PVA共混膜,并进行湿热处理,用FT-IR、XRD对经过湿热处理共混膜进行了表征,测试了膜的力学性能和吸水性;结果表明,随着湿热处理时间的增长共混膜的无水结晶峰出现并不断增强。共混膜的吸水性实验表明,壳聚糖/PVA共混膜的pH敏感性可通过控制湿热处理的时间来改变,由于湿热处理不需要引入诸如戊二醛等对生物有毒副作用的化学交联剂,所以该法可望在壳聚糖/PVA共混膜控释体系的后处理方面得到应用。     

湿热处理对壳聚糖／PVA共混膜结构和性能的影响

用流延法成功制备壳聚糖／PVA共混膜．并进行湿热处理，用FT—IR、XRD对经过湿热处理，七混膜进行了裘征，测试了膜的力学性能和吸水性；结果表明，随着湿热处理时间的增长共混膜的无水结晶峰出现并不断增强。共混膜的吸水性实验表明，壳聚糖／PVA共混膜的pH敏感性可通过控制湿热处理的时间来改变．由于湿热处理不需要引入诸如戊二醛等对生物有毒副作用的化学交联剂，所以该法可望在壳聚糖／PvA共混膜控释体系的后处理方面得到应用。     

广东省拖网网囊调查

为实施中华人民共和国国家标准《南海区拖网网囊最小网目尺寸》,对广东省范围内拖网网囊现状进行摸底调查,结果表明,广东省沿海拖网渔船现用网囊网目尺寸(内径)在16.7～35.2 mm范围内,总体平均为27 mm,均未能达到1989年国家技术监督局发布的中华人民共和国国家标准--《南海区拖网网囊最小网目尺寸》--内径39 mm.     

GF-1/2卫星数据地质灾害调查应用能力分析

随着我国航天技术和卫星技术的迅速发展,我国自主发射的卫星遥感数据因其质量高、价格低廉的特点越来越受到各行各业用户的青睐。本文在对地质灾害调查与监测业务需求分析的基础上,开展GF-1/2在地质灾害调查与监测应用中的能力分析和示范应用,促进了GF-1/2数据在地质灾害调查与监测中的规模化和产业化应用。     

基于第三次国土调查成果的专项调查应用探讨 ——武陵源区耕地后备资源调查工作启示

第三次国土调查主体成果土地利用现状数据库已经通过国家验收,并迅速得到广泛的应用[1].然而,如何正确有效利用"三调"数据以及如何与其它专题数据相结合,获得最佳的应用效果是后期工作需要探讨和研究的问题.本文探讨了利用"三调"数据与自然资源、林业、水利、农业农村、生态环境等部门专题数据相结合的技术方法,开展武陵源区耕地后备...     

空间目标匹配方法的应用分析

为了更好地发挥地理空间数据的作用,扩展地理空间数据的应用范围,在实际应用中常常需要对多种来源的、表达同一区域的空间数据进行集成,或利用新近(或现势性高)获取的空间数据对旧的(现势性低)空间数据进行更新。在实现多种空间数据集成或更新过程中,一个关键技术就是对不同的空间数据集进行匹配,以寻找匹配目标对,进而探测不同空间数据集的差异或变化。目前,已提出了许多种匹配方法,这些方法在很大程度上都具有一定的优势或不足。鉴于此,本文系统地回顾已有的空间目标匹配方法,并进行详细地分析与比较,以利该方法的未来发展更为实用。     

四硼酸锂晶体的介电频域谱研究

选用优质四硼酸锂单晶加工成小薄片后测量其频域介电谱。在kHz至1 MHz范围内,观察到空间电荷等所引起的损耗峰,但损耗峰形复杂,不能用用德拜弛豫模型描述;从科尔—科尔图的趋势可以判断该晶体中,空间电荷引起的介电常数变化范围约为9.98¹0.07。由紫外吸收谱估算出电子谐振频率高于1.67 PHz,根据光频段的介电色散模型,分析了折射率测量的实验结果,可得:晶体中电子极化的直流介电常数约为2.55,偶极取向极化和原子(离子)极化对直流介电常数的贡献约为7.43。     

Investigation on influence factors of dual laterologs curve form

In order to investigate the influences of caliper, formation thickness and invaded zone on the form of dual laterologs, forward modeling technique were applied to calculate the dual laterologs for different cases. The result shows that the resistivity logs become smoother and lower as the borehole diameter increases, the increase of the contrast between mud resistivity and formation resistivity induce the logs to be more pointed. When the formation thickness is less than 1m, the two-peak on the logs for resistive invasion vanished, and for thickness between 1 m and 4 m, the form of logs does not vary significantly. If the formation thickness is greater than 4 m, a platform appears on the logs at the middle of the formation. The thinner the invaded zone is, the more obvious the invasion feature on the laterologs is. For thick invaded zone the form of logs tend to be that of an uninvaded resistive formation. The form and amplitude of logs depend on the resistivity contrast between invaded zone, uninvaded formation and adjacentlayers.     

Investigation on influence factors of dual laterologs curve form

In order to investigate the influences of caliper, formation thickness and invaded zone on the form of dual laterologs, forward modeling technique were applied to calculate the dual laterologs for different cases. The result shows that the resistivity logs become smoother and lower as the borehole diameter increases, the increase of the contrast between mud resistivity and formation resistivity induce the logs to be more pointed. When the formation thickness is less than lm, the two-peak on the logs for resistive invasion vanished, and for thickness between 1 m and 4 m, the form of logs does not vary significantly. If the formation thickness is greater than 4 m, a platform appears on the logs at the middle of the formation. The thinner the invaded zone is, the more obvious the invasion feature on the laterologs is. For thick invaded zone the form of logs tend to be that of an uninvaded resistive formation. The form and amplitude of logs depend on the resistivity contrast between invaded zone, uninvaded formation and adjacentlayers.