Production and characterization of high porosity porous Fe-Cr-C alloys by the space holder leaching technique

Spherical carbamide particles were employed to produce porous Fe-Cr-C alloy with high porosity and large aperture via the space-holder leaching technique. A series of porous samples were prepared by regulating the processing parameters, which included the carbamide content and the compaction pressure. The pore characteristics and compression properties of the produced samples were investigated. The samples were characterized by scanning electron microscopy, image analysis, and compression tests. The results showed that the macro-porosity and the mean pore size were in the ranges 40.4%–82.4% and 0.6–1.5 mm, respectively. The compressive strength varied between 25.38 MPa and 127.9 MPa, and was observed to decrease with increasing total porosity.     

少量高血压脑出血微创手术与保守治疗疗效对比研究

目的比较微创血肿清除术与保守治疗少量血肿(30 m L)的高血压脑出血患者临床疗效.方法将临床确诊为颅内深部少量出血的96例高血压患者作为研究对象.将所有研究对象随机分为两组:微创手术治疗组(微创组)(50例患者)和保守治疗组(对照组)(46例患者).微创组采用微创穿刺血肿清除术对高血压脑出血患者颅内血肿进行微创穿刺清除,对照组给以常规药物保守治疗.通过检测神经功能缺损评分、Glasgow昏迷评分、死亡率、再出血率、平均住院时间和格拉斯哥预后(GOS)评分情况,对两组患者的临床疗效和短期预后进行对比分析.结果 1)神经功能缺损评分结果显示:微创组患者神经功能恢复程度显著优于对照组,两组数据比较差异显著,具有统计学意义(P0.05).2)患者入院1周后Glasgow昏迷评分(GCS)检测结果显示:微创组明显好于对照组,两组数据比较差异显著,具有统计学意义(P0.05).3)微创组再出血的发生率较对照组相比有增高的趋势(P0.05),死亡率两组数据比较无显著统计学意义(P0.05).4)微创组患者平均住院时间要短于对照组(P0.05).5)采用格拉斯哥预后(GOS)评分系统对出院半年后患者的生存质量进行评估,结果显示微创组GOS得分情况明显高于对照组,两组数据比较差异显著,具有统计学意义(P0.05).结论 1)微创手术治疗能明显改善少量血肿的高血压脑出血患者意识状态和神经功能障碍,促进功能恢复,缩短患者平均住院时间,患者的短期预后和恢复效果明显.2)微创血肿清除术能显著缩短少量血肿的高血压脑出血患者住院时间,减少患者住院费用,有助于缓解患者经济负担.     

Facile synthesis of polypyrrole nanowires for high-performance supercapacitor electrode materials

Polypyrrole nanowires are facile synthesized under a mild condition with FeCl_3 as an oxidant. Polypyrrole nanowires with the width of 120 nm form many nanogaps or pores due to the intertwined nanostructures. More importantly, PPy nanowires were further applied for supercapacitor electrode materials.After electrochemical testing, it was observed that the PPy nanowire based electrode showed a large specific capacitance(420 Fg~(-1), 1.5 Ag~(-1)) and good rate capability(272 Fg~(-1), 18.0 Ag~(-1)), which is larger than that of most of published results. The as-prepared electrode can work well even after 8000 cycles at 1.5 Ag~(-1).     

宫外孕的超声诊断及临床表现分析

目的:分析宫外孕的超声诊断及临床表现,以期提高宫外孕的确诊率。方法:对125例超声诊断为宫外孕患者的超声诊断及临床表现进行回顾性分析。结果:超声诊断的125例病例均经手术治疗,术后病理确诊122例,诊断符合率97.6%,误诊4例,占3.2%;术后诊断:输卵管妊娠118例,占96.8%,宫角妊娠4例,占3.2%;破裂型5例,占4.0%;未破裂型67例,占54.9%;流产型50例,占40.9%。结论:超声是诊断宫外孕的首选检查方法,在诊断中声像图应密切结合病史、临床表现综合分析,才能减少误、漏诊,提高超声对宫外孕的确诊率。     

机器人与其连带安全装置构成系统的稳定性分析

通过研究机器人与其连带安全装置构成系统的解，分析了系统算子谱点分布情况，并以此结果得出了该系统的渐进稳定性条件．     

后注浆桩技术的应用研究

主要结合工程实例,介绍泥浆护壁钻孔灌注桩后注浆技术的机理、特点、施工工艺及技术要点.     

房屋建筑施工常见安全事故分析

建筑安全生产直接涉及到建筑劳动者的生命安全,与人民群众的根本利益息息相关.文章就房屋建筑施工的安全事故进行分析,以减少安全事故的发生,促进建筑业的健康发展.     

华容道、开窗等经典智力问题的求解算法研究

本文在前人对华容道、孔明棋、九宫拼图问题求解算法研究的基础上,针对这些经典智力问题的特点,利用广度优先和深度优先搜索思路设计算法,并对算法进行搜索减枝优化,设计出了一个相对优化的算法。对于开窗问题,本文通过对该问题规则的分析,设计出了一种效率较高的求解算法。通过使用C#语言编写程序实现算法以及软件的求解功能,经测试与运行证实了本文求解算法的正确性和有效性,并给出了算法的核心C#代码。     

应用复合钢板的压力容器制造工艺

复合钢板因其良好的适用性和经济性而在石油、化工、航海、医疗、食品行业中被广泛应用,但其制造具有特殊性.文章主要从应用复合钢板的压力容器制造中的板材复合、筒体下料、排版、焊接工艺及相关要求进行阐述.