Hydroxyapatite coating on porous silicon substrate obtained by precipitation process

Hydroxyapatite Ca₁₀(PO₄)₆(OH)₂ (HAP) is known as a bioactive and biocompatible material, HAP coatings were used to improve the biocompatible of substrate by many researcher, In this work, HAP thin films on porous silicon (PS) substrates have been prepared by aqueous precipitation method with rapid thermal annealing (RTA) processes. The HAP films had been prepared under the annealing temperature ranging from 300 to 1000 °C. By the measurement of X-ray diffraction (XRD), it was found that for the crystallinity optimization, the heat-treatment at 850–950 °C for 1 h would be favorable. Atomic force microscopy (AFM) and scanning electron microscope (SEM) measurements reveal a dense and smooth surface of the HAP film, and tightly adherence of the coating on porous silicon substrate after sintered. Thus, by this method, porous silicon could be increased its bioactivity and so that could be used in the biomedical area.     

传统与象征——对《滁州西涧》和《游园不值》的现代解析

传统的文学批评是社会历史的批评,它强调艺术的表现对象与人类社会生活的对应关系,这已为广大读者所熟知;弗罗伊德精神分析的解诗方法则强调艺术创造过程和艺术表现对象都是人类无意识深处性本能作用的结果,一切皆与性有关.韦应物和叶绍翁的两首七言绝句当然也是言性之作.这种理论尽管偏颇,难称科学,但惟其不流俗而让人倍感新奇.这预示着富有个性的多元文学批评时代已经来临.     

对"晨光"体育活动的审度与思考

在总结河南省“晨光”体育活动成功经验的基础上 ,对提高学校体育的水平与质量进行了理论性论证 ,进而提出了“晨光”体育活动应推广与普及的合理化建议及可行性措施 .     

电荷量子比特与量子化光场之间的纠缠

研究了初态为混合态的电荷量子比特与量子化光场之间的纠缠.通过求解系统的concurrence下限, 研究初态的混合度λ和失谐量Δ对系统纠缠随时间演化的影响. 在弱场中, 电荷量子比特初始是激发态的系统, 其纠缠度远远大于电荷量子比特初始是基态的系统, 并且Δ对系统的纠缠有明显的抑制作用. 在强场中, 电荷量子比特初始分别为激发态和基态时系统的纠缠演化接近一致, 初态混合度最高时系统的纠缠度最小, 并且Δ对系统纠缠的影响变弱. 关键词： 约瑟夫森结 纠缠 混合态 concurrence下限     

Rational Homotopy Theory and Nonnegative Curvature

in this note, we answer positively a question by Belegradek and Kapovitch about the relation between rational homotopy theory and a problem in Riemannian geometry which asks that total spaces of which vector bundles over compact non-negative curved manifolds admit （complete） metrics with non-negative curvature.     

Cu（Ⅱ） effect on the conformation of regenerated silk fibroin in dilute aqueous solution

Much attention has been paid to the natural mechanism of silkworm spinning due to the impressive mechanical properties of the natural fibers. In this work, we studied the effect of Cu（Ⅱ） ions on the secondary structure of Bombyx mori regenerated silk fibroin （SF） in dilute solution by circular dichroism （CD）. The results indicate that a given amount of Cu（Ⅱ） induces the SF conformational transition from random coil to β-sheet, however, further addition of Cu（Ⅱ） is unfavorable for this conversion. Meanwhile, the conformational changes induced by Cu（Ⅱ） follow a nucleation-dependent aggregation mechanism, which is similar to that found in Prion protein （PrP） denaturation and Aβ-peptide aggregations, leading to the neurodegenerative disease. This work would help one understand further the natural spinning process of silkworm. Additionally, it would be significant for the study of the nervous system diseases, because silk fibroin, extracted in large amounts from Bombyx mori silkworm gland, could be a proper model to study PrP denaturation and Aβ-peptide aggregations.     

高频MOS－CV特性的界面态形变及其测量

讨论了工艺过程中产生的界面态陷阱电荷Ｑ（ｉｔ）对高频ＭＯＳ－ＣＶ特性线的形变规律，提出了一种沿电压方向形变的数据处理方法，以此算出Ｑ（ｉｔ）密度在禁带中的分布，并对常规高频ＣＶ法的测量误差作了讨论和修正，由于数据的采集和处理可以由微机完成，使这种方法变得简便、准确并易于在工艺线上推广使用。     

On N-widths in Ip

In this paper we prove that (1<p<+∞), give the characteristics of x^o and the optimal subspace for n-width d_n in space X=l _n ^N . Where d_n in the n-width, in the sense of Kolmogorov, ofD in X, dⁿ is the n-width ofD with respect to X, in the sense of Gel'fand, δ is the linear n-width ofD with respect to X.     

泥浆传送涡轮转速信号的分析处理

本文对传送涡轮钻转速信号的泥浆信道的干扰与噪声特性作了分析,从理论上阐述了从强的周期性干扰与噪声中实时检测出转速信号频率的谱分析法。提出了干扰带的概念,并详细分析了不同窗函数在已定干扰带的条件下所需的数据时宽。根据噪声强度推导了用平均法降低噪声功率谱方差所需的分段数以及总的数据时宽。     

Rh(Ⅰ),Co(Ⅰ)和Ru(Ⅱ)双齿磷氢化物的合成.结构表征和催化加氢活性

膦配位的过渡金属氢化物被看作是烯烃及其他一些不饱含有机化合物催化加氢反应及氢甲酰化反应的催化活性物种,关于它们的结构与催化活性关系的研究,有着重要的理论意义和实际意义,通常单齿膦配位表现出较高的催化活性,而不同的金属中心在催化活性和选择性上也表现出明显的差别,反映了催化功能与催化活性物种的电子结构和空间结构之间存在着依存关系.膦配体过渡金属氢化物,通常是以它们的相应卤化物经氢化锂铝或硼氢化钠或肼还原得