Contrast Adaptation Decreases Complexity in Retinal Ganglion Cell Spike Train

The difference in temporal structures of retinal ganglion cell spike trains between spontaneous activity and firing activity after contrast adaptation is investigated. The Lempel-Ziv complexity analysis reveals that the complexity of the neural spike train decreases after contrast adaptation. This implies that the behaviour of the neuron becomes ordered, which may carry relevant information about the external stimulus. Thus, during the neuron activity after contrast adaptation, external information could be encoded in forms of some certain patterns in the temporal structure of spike train that is significantly different, compared to that of the spike train during spontaneous activity, although the firing rates in spontaneous activity and firing activity after contrast adaptation are sometime similar.     

聚变实验增殖堆FEB-E粒子抽除和抽气系统(英文)

ＦＥＢ－Ｅ的粒子抽除是通过偏滤器进行的。由４８ 个楔形气室模件环形组装而成的ＦＥＢ－Ｅ偏滤器，位于真空室的下部，与抽气系统和冷却系统相连。ＦＥＢ－Ｅ抽气系统有二个子系统：环粗抽系统和环高真空系统。环高真空系统是由一组处于真空室内１６ 个下部舱口内的低温泵和一组处于生物屏蔽层外的附加涡轮分子泵组成的。这些低温泵能提供的名义总抽速为５７６ｍ ３·ｓ－ １。在偏滤器高中性压力（＞ １Ｐａ）情况下，低温泵入口阀节流控制抽气粒子流。由于偏滤器抽气槽路以及偏滤器下侧通至真空室下部舱口的有限的通导能力，这些低温泵在偏滤器幽僻区域有效抽速为１６０ｍ ３·ｓ－ １。这意味着偏滤器幽僻区域的中性压力应在０．５－ １．０Ｐａ 范围内，以得到８０－ １６０Ｐａ·ｍ ３·ｓ－ １（在预期的偏滤器抽气槽路温度为４７３Ｋ时）范围内的抽气流量。低温泵每次在聚变实验增殖堆燃烧１０００ｓ 后受激运行     

基于半导体泵浦倍频绿光激光器的探究性实验设计

为探究在谐振腔中倍频晶体位置对绿光激光器输出功率的影响，利用半导体泵浦固体激光实验仪设计了腔内和腔外倍频绿光的探究性实验。分析了绿光倍频效率与基频光束的功率密度及光斑半径之间的关系，分别测量了磷酸钛氧钾(KTP)倍频晶体位于谐振腔內部和外部不同位置时，532 nm倍频绿光的输出功率。其中在腔外倍频实验中，分别设计了腔外不加透镜时KTP晶体位于腔外不同位置，以及加上透镜时KTP晶体位于聚焦位置两种实验方案。同时，在实验中引导学生利用谐振腔理论和高斯光束传输理论等激光原理计算1 064 nm基频光在腔内外不同位置的光斑半径，分析了KTP晶体在不同位置时532 nm倍频光输出功率出现差别的原因，以及利用透镜聚焦提高激光功率密度以达到提高倍频效率的方法。     

SINGULAR INTEGRAL EQUATIONS IN ORLICZ SPACES (Ⅱ)

The singular integral equations with Cauchy kernels have studied in L_p(Γ),p>1,in detail.Here Γ stands for the set of a finite number of closed Liapunoff's curves which have no common points and T denotes the completely continuous operator in the space sunder consideration. In this paper, we consider the equations mentioned above in Orlicz spaces L_M(Γ). It is proved that the Nether theorem and the index formula are hold true in the case of reflexive Orlicz spaces.     

ON THE REGULARITY AND EXISTENCE OF SOLUTIONS FOR SEMILINEAR ELLIPTIC EQUATIONS OF SECOND ORDER

Let Ω(?)R~n be a bounded domain with a smooth boundary (?)Ω L a strictly elliptic operator and c(x)≥0 in Ω. In this paper we are concerned with the following Dirichlet problem with the growth condition (P_1): a<2, for n=2. It is proved that if p(x, t) has all derivatives up to order l which are locally Hlder continuous in (?)×R. and if a_(ij)(x) ∈C_(l 1,α)(Ω) and c(x)∈C_(l,α)(Ω), then any weak solution in W_0~(1,2) of (1) lies in C_(l 2,α)(Ω). Moreover, under the growth condition (P_1) and some additional assumptions, the existence of nontrivial solution of (1) is proved. The main difficulity here is that the simple bootstrapping procedure fails to apply directly to the case of the growth condition (P_1).     

二机器流水作业排序问题全部最优解的结构

排序问题F2||Cmax,Johnson条件只是最优解的充分条件，不是必要的．本文绘出一个充分必要条件，由此得到生成全部最优解的算法．主要理论是基于一种序论方法．     

由三氯丙烷粗馏分制取三醋酸甘油酯

三醋酸甘油酯工业上历来是用甘油与醋酸酯化制得[1],三醋酸甘油酯用作纤维素树脂和乙烯基聚合物、共聚物的增塑剂。主要用于增塑醋酸纤维素作卷烟过滤嘴,可提供良好的弹性、透气性和合适的硬度。工业上由氯丙烯生产环氧氯丙烷过程中,生产相当量的三氯丙烷(以下简称ＴＣＰ),1,3二氯2丙醇等副产品[2]。以齐鲁石化公司氯碱厂3.2×104ｔ/ａ环氧氯丙烷装置为例,副产物ＴＣＰ达2000ｔ/ａ。它们在生产中成为一个馏分分离出来。这一馏分没有什么用处,用燃烧法处理时还生成ＨＣｌ等废气污染环境[3],我们考虑将它转化为三醋酸甘油酯,既可以变废为宝又…     

LIA组元的脉冲功率调制系统研制

本文介绍一种以加速组元为终端负载的纳秒脉冲功率系统。获得的加速间隙电压为350kV，90ns(半高宽)，波形上升时间为30ns；Blumlein主开关工作电压大于280kV，抖动小予1.5ns(均方根值)。对同轴场畸变开关性能的进一步改善作了必要的讨论，提出了用等场强原则偏置触发极，比通常采用自然中位面方法，可使开关工作电压提高8．7％。