多官能度活性橡胶增韧环氧树脂的研究：Ⅲ.三元共混增韧环氧树脂

本文研究了双酚A对多官能度环氧基和羧基聚丙烯酸正丁酯橡胶增韧环氧树脂的影响。结果表明,加入双酚A,拉伸断裂能有大幅度提高,同时不降低弹性模量。这可能是由椽胶提高断裂伸长与双酚A提高屈服应力产生协同效应的结果。对羧基橡胶增韧的三元共混体系,拉伸断裂能随羧基官能度上升而增加。断裂面的形态研究表明,由于羧基橡胶与双酚A的酯化反应,大大减少了羧基橡胶聚集对增韧的不利影响。     

橡胶活性官能团对增韧环氧树脂动态力学性能的影响

用动态扭摆法测试聚丙烯酸丁酯橡胶增韧环氧树脂的动态力学行为,研究在环氧树脂低固化度和高固化度时,橡胶活性官能团种类(环氧基官能团与羧基官能团)和数量(官能度)对其影响。研究体系中橡胶玻璃化转变温度(Tg)的移动大小,与橡胶和基体树脂健合程度之间的关系。     

CA-199、CA-50联检对消化道肿瘤的诊断价值评价

目的 :探讨糖类抗原CA -199及CA -5 0联合检测对消化道恶性肿瘤诊断的临床价值。方法 :用化学发光及免疫放射方法检测 5 0例健康者 ,88例消化道良性疾病及 91例消化道恶性肿瘤患者血清中CA -199及CA -5 0的含量。结果 :消化道恶性肿瘤患者血清CA -199、CA -5 0值均明显高于正常健康人及消化道良性疾病 ,两者比较有显著性差异 (P <0 0 1) ,CA -199、CA -5 0两者联合检测较单项检测任何一项其阳性率、准确率均有明显提高。结论 :CA -199、CA -5 0联检可为临床减少漏诊、误诊 ,为早诊早治提供有价值的信息     

新型粘结固定桥临床应用初步观察

目的 观察一种用于牙列缺损永久修复的新型粘结固定桥的临床效果。方法 选择有单个或多个牙缺失的病人，进行固定桥基牙的牙周和特定的牙体预备。然后制作固定桥并试戴，用4－META／MMA－TBB树脂粘结剂粘结固定桥。结果 267例（304个）固定桥病人经二年以上随访，发现192个前牙桥中只有1个，112个后牙桥中只有2个脱落，其余固定桥稳定、功能良好。结论 采用树脂粘接技术，结合基牙的机械预备，能较好地克服3／4冠桥、桩冠桥和嵌体桥的缺陷，使之成为良好永久的修复体。     

胜利黄岛原油深度电脱盐的研究：Ⅰ.破乳剂组成的影响

根据胜利黄岛原油的性质，在筛选了几十种破乳剂的基础上，选择了酚醛树脂和环氧环烷，环氧乙烷的嵌段共聚物作破乳剂，探讨了破乳剂组成对原油脱水，脱盐以及界面张力的影响，通过静态脱盐，脱水试验，得到了适合黄岛原油的最佳破乳剂组成。     

带塑料插入件栓式附着体义齿修复后满意度的调查

目的 通过问卷调查表对患者戴用附着体义齿后的主观感受进行研究.方法 选择上下牙列缺损患者42例,共制作带塑料插入件栓式附着体义齿47例,于戴牙后1个月,患者基本适应戴用义齿,通过问卷调查,了解患者戴用义齿后的适应情况、对义齿的满意程度及咀嚼功能的变化等.结果 患者对带塑料插入件栓式附着体义齿和传统可摘局部义齿两种修复方式比较,在总的满意度、美观、舒适、咀嚼、语言、适应期、食物结构改变等方面,前者明显优于后者,差异有统计学意义.结论 带塑料插入件栓式附着体义齿在美观及功能上不仅能满足患者的要求,而且远优于传统可摘局部义齿.     

Radium-228 determination of natural waters via concentration on manganese dioxide and separation using Diphonix ion exchange resin

The objective of this work was to establish a new procedure for ²²⁸Ra determination of natural waters via preconcentration of radium on MnO₂ and separation of its daughter, ²²⁸Ac, using Diphonix ion exchange resin. Following removal of potential interferences via passage through an initial Diphonix Resin column, the first daughter of ²²⁸Ra, ²²⁸Ac, is isolated by chromatographic separation via a second Diphonix column. A holding time of >30 h for ²²⁸Ac ingrowth in between the two column separations ensures secular equilibrium. Barium-133 is used as a yield tracer. Actinium-228 is eluted from the second Diphonix Resin with 5 ml 1 M 1-Hydroxyethane-1,1-diphosphonic acid (HEDPA) and quantified by addition of scintillation cocktail and LSC counting. Radium (and ¹³³Ba) from the load and rinse solutions from the 2nd Diphonix column may be prepared for alpha spectrometry (for determination of ²²³Ra, ²²⁴Ra, and ²²⁶Ra) by BaSO₄ microprecipitation and filtration. Decontamination tests indicate that U, Th, and Ra series nuclides do not interfere with these measurements, although high contents of ⁹⁰Sr (⁹⁰Y) require additional treatment for accurate measurement of ²²⁸Ra. Addition of stable Sr as a “hold back” carrier during the initial MnO₂ preconcentration step was shown to remove most ⁹⁰Sr interference.     

Asymptomatic primary mucinous cystadenocarcinoma of the appendix with a large abdominal mass: Report of a case

A case of cystadenocarcinoma of the appendix with a large cystic lesion is reported. A 49-year-old man undergoing a routine ultrasonic scan was incidentally found to have an abdominal mass measuring some 30 cm in size. The clinical presentation was asymptomatic, and the patient underwent a laparotomy without ascertaining a diagnosis preoperatively. The lesion, which derived from the appendix, was removed and was found to be cystic and contained huge amounts of mucin. The histological findings revealed a well-differentiated cystadenocarcinoma of the appendix, and immunohistochemical staining of the epithelium and mucinous implants in the mass demonstrated a positive reaction for carcinogenic antigens, including carcinoembryonic antigen and carbohydrate antigen.