Close-to-zero eigenvalues of the rooted product of graphs

Journal of Mathematical Chemistry - The construction of vertex-decorated graphs can be used to produce derived graphs with specific eigenvalues from undecorated graphs, which themselves do not have...     

A Unified Boundary Behavior of Large Solutions to Hessian Equations

This paper is concerned with strictly k-convex large solutions to Hessian equations S_k(D~2u(x)) = b(x)f(u(x)), x ∈ ?, where ? is a strictly(k-1)-convex and bounded smooth domain in Rn, b ∈ C~∞(?) is positive in ?, but may be vanishing on the boundary.Under a new structure condition on f at infinity, the author studies the refined boundary behavior of such solutions. The results are obtained in a more general setting than those in [Huang, Y., Boundary asymptotical behavior of large solutions to Hessian equations,Pacific J. Math., 244, 2010, 85–98], where f is regularly varying at infinity with index p k.     

LON智能变送器设计与实现

智能化仪器仪表设计研究成为新一代工业制造技术突破的重要瓶颈之一。LON智能变送器是基于LonWorks总线,具有多种信息智能处理的智能变送器,能够将标准的模拟信号、传感器输出的非标准的弱模拟信号及其脉冲信号转换为数字信号,与其它控制仪表实现双向数字通讯。LON智能变送器除了具有数字调零、数字滤波等功能外,其重要特征是具有传感器故障诊断与处理功能,在传感器失效后,能够在一定时间内继续输出有效数据,保证控制系统的稳定和安全。     

A class of two-sex branching processes with reproduction phase in a random environment

We model the demographic dynamics of populations with sexual reproduction where the reproduction phase occurs in a non-predictable environment and we assume the immigration/out-migration of mating units in the population. We introduce a general class of two-sex branching processes where, in each generation, the number of mating units which take part in the reproduction phase is randomly determined and the offspring probability distribution changes over time in a random environment. We provide several probabilistic results about the limit behaviour of populations whose dynamics is modelled by such a class of stochastic processes. In particular, we provide sufficient conditions for the almost sure extinction of the population or for its survival with a positive probability. As illustration, we include some simulated examples.     

纳米纤维素/MnO2自支撑锌离子电池正极的制备及其电化学性能研究

以羟基纳米纤维素为原料,利用其表面丰富的羟基还原KMnO 4,在纳米纤维表面原位生成MnO₂纳米颗粒,并与Super P混合,通过简单抽滤的方式获得CNF@MnO₂/Super P自支撑正极。结果表明:无粘结剂的CNF@MnO₂/Super P自支撑正极具有较高的循环稳定性,在0.5 A·g^-1的电流密度下,循环800圈后,容量仍能达到247 mAh·g^-1;均匀分布的纳米MnO₂与Super P能够有效缩短离子和电子扩散路径,大大降低材料的电阻,使正极具有良好的倍率性能,在2 A·g^-1的电流密度下,循环300圈之后,电池容量仍保持在175 mAh·g^-1,库仑效率~99%;利用该正极良好的延展性,制备了软包电池,并表现出了较高的循环稳定性和容量保持率,该工作为柔性无粘结剂的水系Zn-MnO₂二次电池的设计开发提供了新的研究思路。     

A novel phycocyanin-Chla/c2-protein complex isolated from chloroplasts of Chroomonas placoidea

Nine pigment-protein complexes were separated and characterized from intact Chroomonas placoidea chloroplasts by IEF.The bandsⅠ-Ⅵwith their isoelectric points (pI) values from 4 to 6 were phycocyanin components;bandsⅧandⅨ(pI=2.8-3.6) were chlorophyll-protein complexes.According to absorption and fluorescence spectra,bandⅦwas designated as a novel phycocyanin-Chla/c_2-protein complex (pI≈3.4-3.7).These results indicated that phycocyanin is structurally and functionally coupled with chlorophyll-protein complex in C.placoidea,and probably interacted with electrostatic force in combination.     

二盐酸氟哌噻吨几何异构体的核磁共振研究

采用COSY、NOESY、HSQC、HMBC二维核磁共振技术，首次对二盐酸氟哌噻吨的两种几何异构体的^1H-NMR、^13C-NMR谱信号进行全归属。归属结果表明，二盐酸氟哌噻吨两种几何异构体的部分^1H-NMR、^13C-NMR谱数据差别较大，可作为区分两种异构体的一个指标。     

The uniqueness of positive solution for a fractional order model of turbulent flow in a porous medium

In this paper, we establish the uniqueness of positive solution for a fractional model of turbulent flow in a porous medium by using the fixed point theorem of the mixed monotone operator. An example is also given to illustrate the application of the main result.