二阶三点半正边值问题正解的存在性

利用锥的Krasnosel'skill不动点定理建立了二阶三点半正边值问题u″+λf(t,u)+δg(t,u)=0, t∈(0,1),u(0)=0, αu(η)=u(1).其中,λ,δ＞0, 0＜η＜1, 0＜αη＜1正解的存在性,这里,非线性项不需要是非负的.     

关于RNP和SCS的若干等价条件

使用切片方法，讨论了Banach空间中有界闭凸子集的RNP和SCS的若干等价条件．     

锰酸锂动力锂离子二次电池中主要化学元素的回收研究

介绍了锰酸锂废旧锂离子电池经放电处理后,再对其进行拆解→活性物质剥离→酸溶→沉淀回收Mn、Li等工艺处理,有效地回收了其中的锰和锂。实验结果表明:用2mol·L-1的HNO3 1mol·L-1的H2O2体系,在固液比为65g·L-1的情况下对经过600℃处理的锰酸锂进行酸溶效果最佳,LiMn2O4的溶解率为100%,锰的回收率达98%,所得Li2CO3沉淀纯度可达97%以上。     

地震数传电缆检测仪的研制

分析了地震数传电缆的测试方法，探索了一种零点脉冲反射法．介绍了用该方法设计的地震数传电缆检测仪的组成和主要性能．该检测仪可测试地震数传电缆的六种主要参数，能较全面地评价电缆质量．整机由单片机控制，配有微型打印机和液晶显示器，操作简便；既可在室内工作，也可在野外条件下检测．     

Complex point sources in probe-corrected cylindrical near-field scanning

A probe-corrected theory based on complex point sources is presented for computing the acoustic field of an arbitrary finite source from measurements of the near field on a cylindrical scanning surface. The complex point sources are used both as basis functions for the expansion of the field outside the scan cylinder and for the representation of the probe. The resulting probe-corrected formulas are considerably simpler than the standard probe-corrected formulas based on cylindrical waves. The new formulation makes simulations of near-field scanning systems much less computationally intensive than simulations based on standard theory. The complex point-source theory is validated through numerical examples involving a baffled circular piston transducer probe.     

A Simple Chaotic Circuit with Impulsive Switch Depending on Time and State

This paper presents a simple chaotic circuit consisting of two capacitors, one linear two-port VCCS and one time-state-controlled impulsive switch. The impulsive switch causes rich chaotic and periodic behavior. The circuit dynamics can be simplified into a one-dimensional return map that is piecewise linear and piecewise monotone. Using the return map, we clarify parameter conditions for existence of chaotic and periodic attractors and coexistence state of attractors.     

第一临界情形下的三次系统局部结构的判断准则

讨论了第一临界情形下的平面三次系统高次奇点的局部拓朴结构，并给出利用多项式系数的判断准则。     

不变拟凸性与多目标规划的一个问题

定义了Ⅰ类不变拟凸、Ⅰ类严格不变拟凸、KT－Ⅰ类严格不变拟凸的向量值函数，并在目标规划中，获得了每个驻点（或KT－T点）是有效点的等价条件。     

EXISTENCE OF POSITIVE FIXED POINTS FOR SEMIDIFFERENTIABLE SEMICOMPACT 1-SET-CONTRACTIONS

This paper obtains some fixed point theorems of semidifferentiable semmicompacl l-set-contraction maps, which extend some known results in [1, 2, 4, 5, 7].