植物胶重晶石粉加重泥浆在有承压水厚覆盖地层中应用成效

主要阐述在承压水厚覆盖层（非固结）钻进中植物胶加重晶石粉配制泥浆顺利钻穿复杂地层问题，对水电站选址勘查有参考意义。     

The effect of post-irradiation cooking on the ESR signal in irradiated chicken drumsticks

Groups of seventy-two, 6-week-old broiler chicken carcasses were either not irradiated and served as controls or were given 2.5 or 5.0 kGy doses of irradiation. Half of each group remained uncooked and half were cooked in a convection oven at 190°C. Pairs of drumsticks were taken from each carcass, the bones excised and the free radical content measured using electron spin resonance (ESR) spectroscopy. The ESR signal strength increased significantly as irradiation dose increased, the value at 5.0 kGy being 96% greater than that at 2.5 kGy. Cooking significantly reduced the free radical concentration of the irradiated bone by approximately 23%.     

影响铅酸蓄电池槽体胶封性能的因素

介绍了阀控铅酸电池ABS槽体封胶的影响因素 ,为设定封胶的工艺参数提供了可靠的试验依据     

影响LR03无汞电池电流的主要因素

对无汞碱性锌锰电池采用钢壳涂石墨胶,正极环复压的试验进行分析,探讨有关工艺技术和关键工序控制,提高无汞电池的短路电流,使无汞电池性能得到充分发挥。     

Development of nanocomposites for bone grafting

This article reviews nanocomposites focusing on their impact and recent trends in the field of bone grafting. Although autogenous- and allogeneic-bone grafts have been used for a long time in bone therapies, there is still a donor shortage and infection risk. As an alternative, synthetic biomaterials have been developed and clinically used as bone grafts, but most of them differ substantially from natural bone either compositionally or structurally. It remains a great challenge to design an ideal bone graft that emulates nature’s own structure. Owing to the composition and structural similarity to natural bone, most of the current investigations involve the use of nanocomposites, particularly hydroxyapatite/collagen system, as promising bone grafts, but it is surprising that none of the reports review the rationale and design strategy of such nanocomposites in detail for the benefit of researchers. Accordingly, this article addresses the state-of-the-art of those nanocomposites and provides suggestions for future research and development. This review provides an overview of the nanocomposite strategy of bone, bone grafting, synthetic approaches to bone structure, development of nanocomposites from the conventional monolithic biomaterials, and recently developed processing conditions for making nanocomposites. The review is expected to be useful for readers to gain an in-sight on the state-of-the-art of nanocomposites as a new class of synthetic bone grafts.     

基于TRIZ理论的文件袋密封涂胶装置设计

目的设计出一种文件袋密封涂胶装置,其涂胶机构能够适应不同尺寸的文件袋密封的涂胶,使机构更易于适应复杂的工况环境。方法基于TRIZ理论的动态化原理和机械系统的替代原理,创新设计一种文件袋密封涂胶机构。结果该文件袋密封涂胶装置能够对不同尺寸的文件袋进行精准涂胶,消除了人为涂胶可能产生的的泄密问题,极大地提高了生产效率和安全性。结论运用TRIZ理论,成功地解决了现有涂胶装置对不同尺寸文件袋施胶存在的成本高、生产效率低以及封口不准确等问题。     

不同植物纤维/骨胶复合材料的性能对比

为利用农业废弃物制备生物质材料,以稻秸秆、麦秸秆、花生秸秆、稻壳、麦壳及花生壳为填充材料,以骨胶为基体材料,采用模压成型工艺制备六种生物质植物纤维/骨胶复合材料,对六种植物纤维成分进行测试,对其制备的生物质复合材料的力学性能、吸湿性能、表面官能团和热稳定性进行分析,用体视显微镜观察复合材料拉伸断面的微观结构。结果表明,麦秸秆纤维素含量较高,稻秸秆纤维素含量仅次之。同种生物质的秸秆比其壳制备的复合材料性能好,其中稻秸秆/骨胶复合材料有较好的界面相容性和力学性能,其拉伸强度和冲击强度分别为4.14MPa、4.89kJ/m~2,比稻壳/骨胶复合材料分别高118%、22.6%,比麦秸秆和花生秸秆制备的复合材料分别高4.42%、37.3%和56.9%、20.8%。稻秸秆/骨胶复合材料的抗吸湿性能较好,平衡吸湿率为12.35%,比麦秸秆、花生秸秆、麦壳、稻壳、花生壳制备的复合材料分别低27.11%、16.72%、19.36%、0.04%、15.97%。麦秸秆由于表面蜡质层,其与骨胶制备复合材料的性能较差。六种生物质复合材料中,稻壳/骨胶复合材料的热稳定性较好。     

剪切增稠胶/聚氨酯泡沫复合材料的制备与力学性能

以聚氨酯泡沫(PUF)为体系基础,向体系中添加聚合物剪切增稠胶(STG),采用一步法成功制备了STG/PUF复合材料。研究分析了异氰酸酯指数(R值)以及STG含量对STG/PUF复合材料结构和性能的影响。结果表明,STG的加入会使泡沫的泡孔变大,发泡困难,但是会在一定范围内增加复合材料的压缩强度,并且会显著提高泡沫的静态吸能量,制备的STG/PUF样品(R值为0.75,STG质量分数为10%)的静态吸能量约为PUF的13倍。另外,随着R值的增加,PUF的密度先减小后增大,硬度逐渐增大,当异氰酸酯含量过高时,会导致泡沫脆性增加,降低其力学性能。当R值为0.75、STG质量分数为10%时,复合材料的力学性能最优。     

ABS高胶粉接枝马来酸酐及其对ABS/PET合金性能的影响

采用溶液法制备了丙烯腈-苯乙烯-丁二烯高胶粉(ABSHR)接枝马来酸酐(MAH),使用红外光谱表征了ABSHR接枝马来酸酐(ABSHR-g-MA)的结构;探究了MAH、BPO、ABSHR的用量及反应温度和反应时间对ABSHR-g-MA接枝率的影响,以及ABSHR-g-MA作为增容剂对ABS/PET合金性能的影响。结果表明:ABSHR-g-MA接枝率随着MAH和BPO用量的增加而增加,但添加量过高时,接枝率增加缓慢或有所降低;适当升高反应温度和延长反应时间有利于接枝反应的发生;ABSHR-g-MA作为ABS/PET合金增容剂,随着ABSHR-g-MA接枝率的增加缺口冲击强度和断裂伸长率明显增加,分别提高了127%和121%,而拉伸强度和弯曲强度稍有降低;同时随ABSHR-g-MA接枝率的增加合金的耐热性能提高,熔融流动速率有所降低。