Structures and Properties of Composite Yarns of Filaments and Wool Staple Fibers

More and more composite yarns of filament and wool staple fiber have been applied to develop the new type of fabrics. However, the great difference in yarn structures between the composite yarns and conventional staple yarns does affect the properties of yarns and fabrics. In this paper, it has been studied that the differences of the composite yarn properties of tensile, bending rigidity, torsional rigidity, the hairiness and irregularity etc.     

N维欧氏空间曲线的曲率公式

给出了Ｎ维欧氏空间一般参数形式的曲线的曲率公式的一种简洁形式，同时给出了详细的推导和证明过程。     

Sylvaticin: a new cytotoxic and insecticidal acetogenin from Rollinia sylvatica (Annonaceae)

Sylvaticin (I), a new tetrahydroxy annonaceous acetogenin with nonadjacent tetrahydrofuran rings, has been isolated from the dried fruits of Rollinia sylvatica St. Hil. (Annonaceae). This compound is extremely cytotoxic to human tumor cells and shows promising insect control properties.     

提高综采面设备及系统可靠性的主要途径

针对高产高效综采面配套设备的技术特征，适应开采煤层的特点及目前我国高产高效综采面配套设备存在的有关问题进行分析，探讨我国高产高效综采面设备及系统的生产能力和可靠性。     

Banach空间上的微分同胚

本文利用非负强制函数及吸引盆的方法，将微分同胚问题转化为讨论相应纯量微分方程在[0,+∞)上存在非负解，得到了Banach空间的几个全局微分同胚定理，结论推广了文[5]、[7—9]、[12]中的一些主要定理．     

Synthesis of stable 2-sulfoniophenolate

A series of novel stable 2-sulfoniophenolates (5a-5e, 7a, 7b) were synthesized for the first time by the reactions of 3, 7-dinitrodibenzobromolium bisulfate (3) with some sulfoxides and the reactions of 3,7-dinitrodibenzocycloiodonium salts (6a, 6b) with dimethyl sulfoxide under basic condition. Their structures were established by elemental analysis, NMR, MS, IR, etc. The role of the amine (or other basic compounds, such as NaOH, Na₂CO₃, etc.) in the reactions was discussed. A possible reaction mechanism was proposed, by which a dissymmetric substituted benzyne was presumed to be the reaction intermediate.     

缺血性脑血管病与神经细胞凋亡的研究进展

叙述了细胞凋亡概念及神经细胞凋亡的基本特征。细胞凋亡是迟发性神经元死亡的基本形式，细胞凋亡在短暂性局灶性脑缺血、短暂性全脑缺血及永久性脑缺血中随缺血时间再灌注时间的不同，细胞凋亡发生部位及时间、范围亦不相同。     

浅析部分四川方言词语的民俗语源

本文分析了部分四川方言词语的民俗语源 ,并认为探究方言词语的语源 ,绝不应只拘泥于语言的内容研究 ,还应该结合其产生的一些文化背景     

Effects of the Water in Mixed Solvent on the Epoxidation Reaction of Propylene with TS-1 Catalyst

The epoxidation reaction of propylene and hydrogen peroxide with zeolite catalyst containing titanium-silicalite (TS-1)has been studied, and the reaction in the mixed solvent of water/methanol has been discussed. It is shown that the selective of epoxidation propylene decreases while the selective of propylene glycol increases, when the water content increases in the mixed solvent of me thanol/water.     

控制体有限元方法中质量加权迎风格式的迁延修正

控制体有限元方法对于处理流动问题提供了一种较好的数值模拟方法，但对于大Ｒｅｙｎｏｌｄｓ数的回流流动问题，该方法在采用各种迎风格式时仍存在着严重的假扩散．为此，对二维质量加权迎风格式，给出了一种由插值单元及其一个与插值点最靠近的相邻单元所确定的多项式插值格式迁延修正的形式．通过对Ｒｅ＝４００、１０００、５０００三种情形的二维空穴流问题的计算，表明该格式可有效地减少控制体有限元方法对回流问题数值模拟的假扩散．