Calculus of Generalized Quasi－differentiable Functions Ⅰ：Some Results on the Space of Pairs of Convex－Set Collections

A Riesz space K1 whose elements are pairs of convex-set collections is presented for the study on the calculus of generalized quasi-differentiable functions.The space K1 is constructed by introducing a well-defined equivalence reation among pairs of collections of convex sets .Some important properties on the norm and operations is K1 are given.     

电生物还原降解二氯酚的动力学特性及功能菌解析

采用电辅助微生物(电生物)体系对二氯酚(2,4-DCP)进行了还原降解研究, 应用聚合酶链式反应-单链构象多肽技术(PCR-SSCP)对微生物群落结构进行解析, 并通过16S rRNA基因克隆及测序构建了系统进化树. 结果表明, 电生物体系对二氯酚的降解符合零级反应动力学特征, 体系中主要以肠球菌(Enterococcus)、 假单胞菌(Pseudomonas)和拟杆菌(Bacteroidales)为优势菌群, 这些菌群在电子传递中起着主要作用. 电生物体系中存在着电极与细胞色素c和脱氢酶的辅酶(NAD)及污染物间的逆向电子传递途径, 可实现电极-微生物-污染物多相界间的长程电子传递.     

一类不可微二次规划逆问题

本文求解了一类二次规划的逆问题,具体为目标函数是矩阵谱范数与向量无穷范数之和的最小化问题.首先将该问题转化为目标函数可分离变量的凸优化问题,提出用G-ADMM法求解.并结合奇异值阈值算法,Moreau-Yosida正则化算法,matlab优化工具箱的quadprog函数来精确求解相应的子问题.而对于其中一个子问题的精确...     

一类耦合非线性Klein-Gordon方程组解的稳定集和不稳定集

利用势井理论的构造方程un-△u u-|v|^ρ 2|u|^ρ△ρu=0;vu-△v v-|u|^ρ＋2|v|^ρv=0的初边值问题的稳定集和不稳定集。证明了当初值属于稳定集时，整体弱解存在，当初值在不稳定集时，解将爆破。     

La-Fe基NaZn13型化合物的磁场诱导熵变研究

围绕具有一级磁性相变的La-Fe基NaZn13型化合物的磁场诱导熵变研究,从室温磁制冷目的出发讨论了材料研究和熵变机制。La-Fe-Si在190K附近5T磁场下的熵变值可达29J.kg-1.K-1。用少量Co替代Fe,可以获得室温附近5T磁场下熵变为15J.kg-1.K-1的大熵变材料。这类材料中的熵变主要由磁有序熵变和晶格熵变组成。分析了一级磁性相变体系中磁有序熵变和晶格熵变对总熵变的贡献,并发现大的熵变来源于被晶格贡献抵消后的磁有序熵变。     

改性磺化聚醚醚酮用作直接甲醇燃料电池聚合物电解质膜

1引言 聚合物电解质膜燃料电池(Polymer electrolyte membranefuel cell,PEMFC)是一种能直接将燃料和氧化剂中的11化学能转化为电能的电化学装置,具有能量转换效率高、环境友好、比能量高(相对于电池)、操作温度低、启动快的特点,可广泛应用于汽车、电站、移动电源等领域[1-4].     

REMARKABLE IMPROVEMENT OF THE COERCIVITY OF TbMn6Sn6 COMPOUND BY MELT-SPINNING PROCESS

The melt-spinning process has been carried out to improve the hard-magnetic properties of the TbMn₆Sn₆ compound. For the TbMn₆Sn₆ ribbons quenched at a rate of 40m/s and annealed at 545K for 30min, the highest coercivity of about 0.6T is achieved at room temperature, which is much higher than that of the TbMn₆Sn₆ ingot. Both the ingot and the ribbon coercivities will increase with decreasing temperature. For ribbons, a greater improvement of coercivity has been made at lower temperatures. Microstructural studies show the uniform nanocrystalline distribution in the TbMn₆Sn₆ ribbons and a small amount of Tb-rich phase in grain boundaries. The observed remarkable improvement of magnetic hardening in ribbons is believed to arise from the uniform nanoscale microstructure and the domain-wall pinning at the grain boundaries.     

CALCULATION OF DEMAGNETIZATION CURVES OF NANOCOMPOSITE Pr2Fe14B/α－Fe MAGNETS USING A ONE-DIMENSIONAL MODEL

The demagnetization curves of nanocomposite magnets have been calculated using a one-dimensional model. The results are in agreement with experimental results. The shoulders of the demagnetization curve have also been explained based on the model.     

腐植酸接枝共聚物对赤红壤K~+吸附与解吸的影响

本文研究了经施用硝基腐植酸与丙烯酸、丙烯酰胺三元接枝共聚物的赤红壤中钾离子的吸附和解吸的影响。实验结果表明,施用共聚物的土壤可减少土壤对中钾离子的吸附,增加土壤对钾离子的解吸,提高钾离子的抗淋溶。改良后的土壤可减少土壤钾的损失,提高钾肥的利用率。     

掺C60及黑胶司机防强光眼镜的研究

1引言 滤光膜分为有机滤光膜和无机滤光膜两种.无机滤光膜是在玻璃或有机材料表面蒸镀某些无机材料而成,它的缺点是镀膜表面易受损,而且镀膜形状不好控制.目前市面上的一些司机防强光眼镜,能防强光,但也使司机观察前方路面亮度降低.有机滤光膜是将某些有机染料混合于一定的有机溶液中,经一定工艺后制得,如明胶滤光片.这种滤光片较脆、易吸潮、长时间暴光后易褪色.作为司机防强光滤光膜,要求厚度薄,可见光波段滤光范围宽,膜的强度高,易于加工,化学性能稳定且防水性能好.