Membrane resting potentials in cultured mouse neuroblastoma cells

Summary Membrane resting potentials (MRP) were measured systematically in cultured mouse N₂A neuroblastoma cells: 1) in the logarithmic growth phase; 2) in subconfluent cultures; 3) in confluent cultures; 4) after dBcAMP had induced morphological differentiation. Neurite extension was accompanied by a significant increase in MRP as compared to the appropriate controls. No significant differences in MRP were observed with regard to the different growth phases.     

基于特征匹配与假设检验的仿真信号确认方法

为降低仿真信号的应用风险,在使用之前需要再次确认仿真信号。根据装备试验特殊的约束与要求,讨论了仿真信号的特征匹配问题。采用参数假设检验的方法确认仿真信号的特征匹配水平,提出了一种基于特征匹配与假设检验的仿真信号确认方法,并就方法应用相关的细节问题进行了深入探讨。在目标回波仿真中的应用表明,该方法在真实信号实测样本不充分的情况下仍能适用,可为确认仿真信号提供决策支持。     

考虑自然灾害等多因素的BWM-GIS城市医院选址

为实现城市医疗资源合理配置,对城市现有医院位置进行科学性评估和对新建医院优化性选址.首先,应用ArcGIS软件构建泰森多边形,对现有医院的分布进行合理性评判,并考虑安全性、可达性和经济性等影响因素构建医院选址评价体系.其次,应用最优-最劣法(BWM)计算指标权重,并将其输入Spatial Analyst叠置分析中,根据加权线性组合(WLC)得到适宜新建医院的选址备选点.最后,采用BP神经网络算法对备选点进行比较,得出最优新建医院选址位置.研究结果表明:考虑自然灾害等多因素的医院选址模型优于仅以可达性为目标的选址模型,同时,也验证了该模型和算法在城市医院选址定量分析中的适用性和准确性.     

理论与工程无间融合教学改革的探索

造纸原理与工程是轻化工程专业的核心课程,传统教学侧重理论讲授,工程实际联系不够,不能很好适应现代造纸企业的需求。以教师主导,学生主体为核心,紧密联系生活和施工现场,改革课程的教学方法和内容,实现理论教学与工程实际的无间融合。通过教学改革,培养学生的工程意识,发挥学生主观能动性,激发学生学习兴趣,增强学生适应企业实际工作环境和解决综合问题的能力,实现岗位"零距离",达到高层次应用型人才培养的要求。     

门式架在现浇箱梁中的应用

由于门式架具有加工简便、拆装灵活、搬运方便、通用性强等特点,所以应用非常广泛。详细介绍了门式架在现浇箱梁中作为满堂脚手架的应用。     

Do caterpillars of Dryas iulia alcionea (Lepidoptera,Nymphalidae) show evidence of adaptive behaviour to avoid predation by ants?

Plants bearing extrafloral nectaries can attract wasps, bugs, and mainly ants. Ants can defend plants against herbivores by treating the plant as an extension of their own territory. We evaluated the efficiency of resting sites built by Dryas iulia alcionea larvae as protection against ant predation on their host plant Passiflora suberosa. The results showed that ants on P. suberosa have significant influence on the survival of D. iulia caterpillars. The use and construction of resting sites was recorded through the fourth larval stadium. A strong inverse relationship between the number of resting sites constructed per larva and the developmental stage of the larvae was observed. Additional results suggest that the efficacy of resting sites against cursorial predators decreases with larval development. The behaviour of constructing resting sites probably evolved by natural selection. It is likely that this behaviour was important for the ancestral lineage that gave origin to Heliconiinae genera Dryas, Dryadula and Phylaethria.     

论邵阳松坡图书馆旧址的历史与文物价值

松坡图书馆旧址是纪念蔡锷将军的重要场所,其创建是基于蔡锷将军的＂爱国尚武＂与＂民主革命＂精神,毛泽东主席曾批示：＂特饬邵阳松坡图书馆列为一等图书馆＂。该馆平面布局科学合理,建筑造型美观适用,具有鲜明的时代特色。且有较好的开发利用价值。     

从施工组织入手做好施工现场的项目管理

施工单位的项目管理涉及到多方面的问题，如质量、工期、安全、资金、资源配置、协作队伍等，因此，必须对现有项目管理的特点全面认识和了解。文章以上海公司为例，结合在建的项目，从施工组织设计方面作一分析，供大家参考。     

翠馨苑小区地基处理

通过对几种地基处理方案约分析比较，翠馨苑小区最终采纳了以石粉田填为主的地基处理方案。石粉成分以长石和石英为主，是一种化学稳定性好、抗风化能力强、无腐蚀、易夯实的材料。用石粉做垫层进行地基处理，加大了上覆非液化土层厚度，使处理后的地基可不考虑液化影响，强度高、压缩性低、消耗上部附加能力强，就地取材、造价低、施工方便，既满足了设计要求，又经济合理。