Channel noise-induced phase transition of spiral wave in networks of Hodgkin-Huxley neurons

The phase transition of spiral waves in networks of Hodgkin-Huxley neurons induced by channel noise is investigated in detail.All neurons in the networks are coupled with small-world connections,and the results are compared with the case for regular networks,in which all neurons are completely coupled with nearest-neighbor connections.A statistical variable is defined to study the collective behavior and phase transition of the spiral wave due to the channel noise and topology of the network.The effect of small-world connection networks is described by local regular networks and long-range connection with certain probability p.The numerical results confirm that (1) a stable rotating spiral wave can be developed and maintain robust with low p,where the breakup of the spiral wave and turbulence result from increasing the probability p to a certain threshold;(2) appropriate intensity of the optimized channel noise can develop a spiral wave among turbulent states in small-world connection networks of H-H neurons;and (3) regular connection networks are more robust to channel noise than small-world connection networks.A spiral wave in a small-world network encounters instability more easily as the membrane temperature is increased to a certain high threshold.     

分光光度法研究IrI26-与常见金属元素的浮选分离

角分光光度法研究碘化钾-四丁基溴化铵体系浮选分离IrI2-的行为及其与常见离子分离的条件.实验结果表明,控制pH 1～2.8,能使IrI26-与Sn(Ⅳ),Co(Ⅱ),Mn(Ⅱ),Fe(Ⅱ),Zn(Ⅱ),Al( Ⅲ),Cr(Ⅲ),Ni(Ⅱ)和MS(Ⅱ)分离.     

分光光度法研究IrI62-与常见金属元素的浮选分离

用分光光度法研究碘化钾-四丁基溴化铵体系浮选分离IrI2-的行为及其与常见离子分离的条件.实验结果表明,控制pH1～2.8,能使IrI26-与Sn(Ⅳ),Co(Ⅱ),Mn(Ⅱ),Fe(Ⅱ),Zn(Ⅱ),Al(Ⅲ),Cr(Ⅲ),Ni(Ⅱ)和Mg(Ⅱ)分离.     

基于XML的移动电子商务数据加密技术的研究

针对移动电子商务的特点,依托XML语言强大的数据处理能力,提出了一种基于XML的移动电子商务数据平台上实现数据加密的技术,即采用改进的对称RC4加密算法和非对称ECC加密算法对移动平台的数据进行加密,该技术使得移动终端之间或者移动终端与数据服务器之间能够更好、更安全的进行交互.整个过程始终采用XML作为数据交换的中介,...     

内燃机车冷却系统技术改造与研究

针对现有内燃机车冷却系统在特殊工况下散热能力不足的问题,在不改变原有冷却系统的基础上增加附加换热器,经计算分析得出满足换热能力和空间尺寸条件的最优参数.并针对主换热器的不同出水水温,分析了要保证内燃机进口水温相对稳定需进入附加换热器的水流量及该水温与水流量的关系曲线.新系统在具有线性特性的温控阀控制下,可实现根据附加换热器进水温度对其进水流量的自动调节,确保内燃机车的安全平稳运行.     

甘蔗酒发酵工艺条件的研究

目的研究以甘蔗为原料发酵制酒的最佳工艺参数。方法利用正交实验方案对甘蔗酒发酵过程中的主要影响因子进行分析,确定最佳条件。结果实验结果表明,装液量90%,SO2添加量100 mg/kg,酵母用量为0.4%,发酵温度为20℃时,乙醇的浓度可以达到7.6%。在上述4种影响因素中发酵温度的影响最大,其次是甘蔗汁的装液量。SO2的含量影响最小。结论在最佳条件下甘蔗汁发酵制酒可使其中的乙醇含量达到7.6%,其他因素的影响研究需要继续进行,不断改进,提高出酒率。     

From Carbon Nanotube Crystals to Carbon Nanotube Flowers

We have investigated the very initial deposition stages of chemical vapor deposition （CVD） with ferrocene （Fe（CsH5）2） and xylene （C8H10） for growing carbon nanotubes, and made clear that the mechanism for the self-organization behaviors of nanotubes at different growth stages by this approach. For instance, the organization of nanotubes into flower-like structures at prolonged deposition is developed from the crystal-like structures formed at early growth stages, both of which are closely related to and determined by the very initial deposition stages of this CVD approach. Based on this approach, ways have been established to build up different architectures of carbon nanotubes, by controlling the initial deposition stages of the CVD process, with which we have realized the selective growth of self-organized carbon nanotube structures. This study provides a new idea for growing carbon nanotube architectures by CVD.     

廻转梁受强动载荷作用的刚-塑性动力响应

核电站及化学工厂中的一些管道结构不可避免地会受到强动载荷的作用,本文基于理想刚塑性模型,分析了在跨度中点受刚性质量块横向撞击作用的甩动管理论模型,即一端铰支,一端自由的廻转梁的塑性动力行为。给出了描述廻转梁早期响应历程的完全解,详细讨论了质量比等有关参数对结构变形和塑性能量耗散的影响以及初始输入能量的分配。研究结果表明,质量比参数对梁结构的动力行为有重要的影响;在能量耗散方面,输入的能量并不全部转化为塑性耗散能,至少有一部分输入能量要转化为动能。     

氧化铝覆炭载体的制备及抗结焦性能考察

将炭载体和γ Al2 O3 载体的优势合为一体 ,可克服两者的不足。以烯烃、芳烃及支链芳烃中的 3种化合物作为覆炭原料 ,制备出了γ Al2 O3 覆炭载体 ,并对其制备条件、抗结焦性能及部分表面性质进行了考察。在覆炭时间相同的条件下 ,3种烃类原料覆炭量由高到低依次为 :烯烃 ,芳烃 ,支链芳烃。覆炭载体的抗结焦性能优于未覆炭的γ Al2 O3 载体 ;覆炭载体上的炭以非结晶形式均匀地分布于γ Al2 O3 表面上 ,覆炭使γ Al2 O3 载体上的中强酸中心显著减少 ,从而有利于改善覆炭载体的抗结焦性能。     

瑞香科杀虫植物--瑞香狼毒

论述了瑞香科杀虫植物和瑞香狼毒（Ｓｔｅｌｌｅｒａ ｃｈａｍａｅｊａｓｍｅＬ．）的分布、群落中的地位、生物学特性、毒性、药用性和生物活性。