A minimal pair joining to a plus cupping Turing degree

A computably enumerable (c.e.) degree a is called nonbounding, if it bounds no minimal pair, and plus cupping, if every nonzero c.e. degree x below a is cuppable. Let NB and PC be the sets of all nonbounding and plus cupping c.e. degrees, respectively. Both NB and PC are well understood, but it has not been possible so far to distinguish between the two classes. In the present paper, we investigate the relationship between the classes NB and PC , and show that there exists a minimal pair which join to a plus cupping degree, so that PC ? NB . This gives a first known difference between NB and PC . (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)     

普通物理实验教学在重建认知结构中的特殊作用

运用教育学和心理学知识，通过典型的普通物理实验，分析了普通物理实验教学在重建认知结构中的特殊作用。     

葡萄酒月度价格指标的季节ARIMA时间序列分析

以时间序列分析为工具,研究了法国葡萄酒价格月度指标,使用基于周期图的Fisher检验证实该数据指标具有潜在周期,最后发现(1,0,0)×(1,0,0)12模型能较好地拟合数据.在此基础上给出相应的预测.     

浅析邯郸农行金库盗窃案涉案巨款追缴

倍受关注的河北省邯郸市农业银行支行金库被盗案近期有了一审结果,任晓峰、马向景二人以贪污罪被判处死刑。任、马二人非法获取四千多万元巨款用于购买彩票,案件受害方邯郸农业银行能否向当地体彩中心索回任晓峰等人用于买彩票而支付的巨款?善意取得能否适用于该案?本文通过分析善意取得制度基本理论,结合新出台的物权法规定,指出此案不适用善意取得,巨款应予追缴返还给邯郸农业银行。     

HACCP在石油行业野外施工食堂中应用的绩效分析

将HACCP这一世界公认的食品安全控制系统引入野外施工食堂卫生管理当中.方法采用文献检索,事故分析、现场调查和Delphi等研究方法,通过对野外施工食源性疾病危害分析、建立关键控制点,形成野外施工食堂管理HACCP管理规范,并组织实施.结果实施HACCP体系后,从业人员手、餐具、菜墩、抹布的抽查合格率有显著提高,食堂从业人员以及参加施工人员对饮食卫生以及食堂卫生管理知识的掌握显著提高.结论在野外施工食品卫生管理中引入HACCP管理体系,控制食源性疾病取得了良好的绩效.     

Nonparametric estimation of distributions with categorical and continuous data

In this paper we consider the problem of estimating an unknown joint distribution which is defined over mixed discrete and continuous variables. A nonparametric kernel approach is proposed with smoothing parameters obtained from the cross-validated minimization of the estimator's integrated squared error. We derive the rate of convergence of the cross-validated smoothing parameters to their ‘benchmark’ optimal values, and we also establish the asymptotic normality of the resulting nonparametric kernel density estimator. Monte Carlo simulations illustrate that the proposed estimator performs substantially better than the conventional nonparametric frequency estimator in a range of settings. The simulations also demonstrate that the proposed approach does not suffer from known limitations of the likelihood cross-validation method which breaks down with commonly used kernels when the continuous variables are drawn from fat-tailed distributions. An empirical application demonstrates that the proposed method can yield superior predictions relative to commonly used parametric models.     

Nonlinear rheological behavior of silica filled solution‐polymerized styrene butadiene rubber

The reinforcement and nonlinear viscoelastic behavior have been investigated for silica (SiO₂) filled solution‐polymerized styrene butadiene rubber (SSBR). Experimental results reveal that the nonlinear viscoelastic behavior of the filled rubber is similar to that of unfilled SSBR, which is inconsistent with the general concept that this characteristic comes from the breakdown and reformation of the filler network. It is interesting that the curves of either dynamic storage modulus (G′) or loss tangent (tan δ) versus strain amplitude (γ) for the filled rubber can be superposed, respectively, on those for the unfilled one, suggesting that the primary mechanism for the Payne effect is mainly involved in the nature of the entanglement network in rubbery matrix. It is believed there exists a cooperation between the breakdown and reformation of the filler network and the molecular disentanglement, resulting in enhancing the Payne effect and improving the mechanical hysteresis at high strain amplitudes. Moreover, the vertical and the horizontal shift factors for constructing the master curves could be well understood on the basis of the reinforcement factor f(φ) and the strain amplification factor A(φ), respectively. The surface modification of SiO₂ causes a decrease in f(φ), which is ascribed to weakeness of the filler–filler interaction and improvement of the filler dispersion. However, the surface nature of SiO₂ hardly affects A(φ). © 2007 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 45: 2594‐2602, 2007     

小阶跃反应性输入时点堆中子动力学方程的解析解

对小阶跃反应性输入（0<ρ,０<β）且有温度反馈时点堆中子动力学方程进行了研究. 导出任意初始功率条件下核反应堆功率、反应性与时间的解析表达式. 分析和讨论了初始功率与输入小阶跃反应性的大小对功率、反应性变化规律的影响，得到了一些新的结果. 关键词： 中子动力学 反应性 点堆 温度反馈     

关于化学位和化学反应等温式几个问题的讨论

讨论了化学位的意义和化学反应等温式的应用条件;△G_m=∑υ_iμ_i≤0,△G_m(T,P,W′=0)≤0、—△G_m(ξ)=—∑υ_iμ_i≥W′和-△G_m(T,P)≥W′作判据的异同和各自使用条件。     

Miniature InGaAsP/InP phase modulator for integrated opto-electronics

Miniature, etching ridge InGaAsP/InP Phase Modulator with highly efficient phase shifting efficiency of 60°/V.mm and 43°/V.mm for TE and TM modes, respectively, and 3 dB bandwidth of 650 MHz at 1.52 μm are reported. It is well suited for integrated opto-electronics. Some functions depending on bandwidth of the devices are discussed.