Synthesis and characterization of biocompatible hydroxyapatite coated ferrite

Ferrite particles coated with biocompatible phases can be used for hyperthermia treatment of cancer. We have synthesized substituted calcium hexaferrite, which is not stable on its own but is stabilized with small substitution of La. Hexaferrite of chemical composition (CaO)_0.75(La₂0₃)_0.20(Fe₂O₃)₆ was prepared using citrate gel method. Hydroxyapatite was prepared by precipitating it from aqueous solution of Ca(NO₃)₂ and (NH₄)₂HPO₄ maintaining pH above 11. Four different methods were used for coating of hydroxyapatite on ferrite particles. SEM with EDX and X-ray diffraction analysis shows clear evidence of coating of hydroxyapatite on ferrite particles. These coated ferrite particles exhibited coercive field up to 2 kOe, which could be made useful for hysteresis heating in hyperthermia. Studies by culturing BHK-21 cells and WBC over the samples show evidence of biocompatibility. SEM micrographs and cell counts give clear indication of cell growth on the surface of the sample. Finally coated ferrite particle was implanted in Kasaulli mouse to test its biocompatibility. The magnetic properties and biocompatibility studies show that these hydroxyapatite coated ferrites could be useful for hyperthermia.     

NEAX61Σ程控交换机远端控制附加业务的方法

主要介绍了NEAX61Σ程控交换机远端控制附加业务的功能,以及实现该业务的方法、局数据的设定等。     

Electrochemical synthesis and characterization of chloride doped polyaniline

Chloride doped polyaniline conducting polymer films have been prepared in a protic acid medium (HCl) by potentiodynamic method in an electrochemical cell and studied by cyclic voltammetry and FTIR techniques. The FTIR spectra confirmed Cl^- ion doping in the polymers. The polymerization rate was found to increase with increasing concentration of aniline monomer. But the films obtained at high monomer concentration were rough having a nonuniform flaky polyaniline distribution. Results showed that the polymerization rate did not increase beyond a critical HCl concentration. Cyclic voltammetry suggested that, the oxidation-reduction current increased with an increase in scan rate and that the undoped polyaniline films were not hygroscopic whereas chloride doped polyaniline films were found to be highly hygroscopic.     

RFT地层测试器与3700测井系统的配接

文章介绍了如何转换CSU系列地层测试器RFT的上传信号，使其能够适应3700测井系统的采集、处理和记录。从而使CSU系列的地层测试器能够配接3700测井系统。     

试油井选层压裂新工艺及现场试验

设计新型可洗井封隔器，保障油井有反洗井通道，有效防止封隔器以上砂埋所引发的管柱砂卡事故，并对新型封隔器、控制开关、密封接头、同心大通径压力计托筒等井下工具组合优化。解决了多层油井任意选层压裂、求产、测井温一体化的难题。     

改性纳米TiO2光催化降解苯酚活性的研究

在装有紫外光的光催化反应器中，用锐钛型纳米TiO2为光催化剂，进行了苯酚水溶液的光催化降解性能的研究。考察了溶液的pH值、纳米TiO2用量、镍（Ni^2＋）掺杂量、苯酚的初始质量浓度等因素对苯酚水溶液光催化降解过程的影响。结果表明，在pH值为7时，苯酚水溶液的降解率达95％以上，强酸和强碱条件均不利于苯酚的降解。当TiO2用量为50mg，UV辐照40min时，200mL质量浓度为50mg／L的苯酚水溶液的降解率为96．3％；当TiO2用量为150mg，UV辐照60min时，200mL质量浓度100mg／L的苯酚水溶液的降解率为95．8％。镍掺杂增加了TiO2的光催化活性，用质量分数为10％的二氯化镍水溶液掺杂制备的复合光催化剂，苯酚水溶液的降解率比未掺杂时增加13．6％。     

梁112块沙四段薄互层低渗透油藏水力压裂工艺优化

梁112块沙四段薄互层油藏属于典型的高压、特低渗透油藏,具有油层多、单层薄、砂岩与泥岩交互等特点。常规压裂效果不理想。通过建立单井模型,确定了压裂应以增加裂缝的长度为主;利用FracproPT软件模拟优化加砂规模;根据油层物性特点优化射孔方案;配套应用粉陶降滤和控制缝高等技术优化了水力压裂工艺。2004年共对11口井实施了大型水力压裂,平均加砂量为42.5m3,平均加砂强度为1.6m3/m,累积增产原油达2.75×104t。     

环糊精降低重整汽油的苯含量

选用β环糊精（β-CD）和羟丙基-β环糊精（HP-β-CD）的水溶液分离混合烃中的苯，通过比较得出HP-β-CD对苯的分离具有较高的选择性。在重整原料油中采用HP-β-CD实现液-液分离，运用正交实验设计方法设计实验，得出最佳分离条件为：HP-β-CD溶液的含量30％，HP-β-CD溶液与重整汽油的体积比3：1，萃取次数9。在此工艺条件下，萃取后重整汽油中的苯含量从5．72％降到1．08％。     

6种金属材料在典型工业大气中的腐蚀规律

选取具有代表性的碳钢、不锈钢、镀锌碳钢、铝、钛和铜挂片,在某企业不同部位投放后进行为期半年的大气腐蚀试验,得出了在半年期中的腐蚀规律。在此基础上,对每种金属材料的腐蚀特点进行总结,并对大气腐蚀的各种影响因素进行分析,提出了行之有效的防护措施。     

施工过程中腐蚀隐患的控制

通过分析石化装置施工过程中常见的现象,分析产生由这些现象加重腐蚀的原因和机理, 指出应加强施工过程中的控制,而达到预期的防腐蚀效果,消除腐蚀隐患。