高强高导Cu-Cr-Zr系合金的研究现状

从合金成分设计、析出相结构和制备技术三方面综述了高强高导Cu-Cr-Zr系合金的研究现状.在分析多种元素对合金强度影响的基础上,重点讨论了稀土元素的作用,适量稀土的加入能同时提高合金的硬度和电导率.Cu-Cr-Zr系合金的析出相主要是Cr和CuxZr（x=3,4,5）相,且合金在470 ℃时效4h形成有序的原子排列,其化合物类型为CrCu2（Zr,Mg）.固溶形变时效强化技术和快速凝固技术与常规固溶时效处理相比都能大大提高合金的综合性能.该类合金今后应向多元微合金化方向发展,尚待解决的主要问题是Zr、稀土等易烧损元素的熔炼较难控制.     

N0501003 固体发酵法生产天然型脱落酸（中试）

该项成果根据植物病理及微生物生理原理，结合脱落酸的化学性质，建立了脱落酸产生菌的快速筛选法，从自然界分离到多株产ABA菌株。工艺中所用菌种是通过紫外、化学、激光等诱变育种筛选获得，该菌的酵产量超过1．4g／kg，发酵周期为7～8天，具有周期短、遗传稳定性好、产量高的特点。研究中根据固体发酵产物特点确定独特的分离纯化工艺，     

铁纳米线阵列的结构与微观磁性

采用电化学方法制备了平行排列的Fe纳米线阵列。利用透射电镜、X—射线衍射、物性测量系统和穆斯堡尔谱分别对样品的形貌、晶体结构、宏观磁性和微观磁性进行了研究。结果表明样品形状均匀，但沿纳米线方向有晶体织构，且存在着很强的形状各向异性。利用结果，结合计算机模拟，对样品中原子磁矩的分布进行了讨论。     

二维金纳米微粒有序阵列的制备

对于用十二烷基硫醇包覆的金纳米微粒，用Langmuir-Blodgett(LB)技术制备了二维金纳米微粒有序阵列．在单纯的硫醇包覆的金纳米微粒形成的LB膜中，由于硫醇分子之间的疏水相互作用，容易导致金纳米微粒的自组织而在LB膜中形成缺陷．为了改善金纳米微粒的成膜性能和提高金纳米微粒阵列的有序性，正十二醇作为添加剂和润滑剂加入到金纳米微粒的氯仿溶液中与金纳米微粒一起形成LB膜．用透射电子显微镜对金纳米微粒的二维阵列进行了表征．结果表明，正十二醇的加入可以有效地减少用LB技术制备的二维金纳米微粒阵列中的缺陷，提高金纳米微粒阵列的有序性．     

Effects of hyaluronic acid－chitosan－gelatin complex on the apoptosis and cell cycle of L929 cells

With the development in the field of tissue engineering, the interaction between biomaterials and cells has been deeply studied. Viewing the cells seeded on the surface of materials as an organic whole, cell cycle and apoptosis are analyzed to deepen the study of cell compatibility on biomaterials, while cell proliferation and differentiation are studied at the same time. In this paper, hyaluronic acid is incorporated into the chitosan-gelatin system. Propidium iodide (PI) was used in cell cycle analysis and the double-staining of cells with annexin-V and PI was applied in cell apoptosis analysis. The results show that incorporated hyaluronic acid shortens the adaptation period of cells on the material surface, and then cells enter the normal cell cycle quickly. In addition, added hyaluronic acid inhibits cell apoptosis triggered by the membranes. Therefore, hyaluronic acid improves the cell compatibility of chitosan-gelatin system and benefits the design of biomimetic materials.     

Loess-soil sequences in southern Anhui Province： Magnetostratigraphy and paleoclimatic significance

Two parallel loess-soil sequences from Xuancheng and Fanchang in southern Anhui Provinces are dated using geomagnetic and luminescence methods.The Brunhes/Matuyama(B/M) reversal boundary is recognized within the lower part of the so-calles Vermiculated Red Soil (VRS) in the Xuancheng section while the entire Fanchang sequence is of Brunhes age.This indicated that the most recent VRS in southern China,a stratigraphic marker and an indication of extremely warm-humid conditions,was formed during the middle Pleistocene,chronologically correlative with the S4 and S5 soil units in northern China.Microscopic and sedimentologic in vestigations reveal that eolian deposition started in this region at about 0.85 MaBp,roughly synchronous with the well-known Mid-Pleistocene climate change of global significance.The strengthening of both summer and winter monsoon circulations and the consequent river hydrological changes at that time would have provided favorable conditions for sustained eolian deposition in the middle-lower reaches of the Yangtze River since 0.85 MaBP.     

n维的Fourier变换及应用

给出了n维Fourier变换及其性质，并借助于欧拉积分给出了一类高维偏微分方程的古典解。     

羟丙基壳聚糖对表面活性剂微孔液相图的影响

在25℃条件下，测定了不同浓度的羟丙基壳聚糖（HPCHS）溶液／表面活性剂（聚氧乙烯（23）醚月桂醇（BRIJ35）、十六烷基三甲基溴化铵（CTAB）、十二烷基硫酸钠（SDS）、二甲基十二烷基甜菜碱（C12BE）／正丁醇（n-C4H9OH)／正辛烷（n-C8H18)体系微乳液拟三元相图。结果表明，在所研究的浓度范围内，羟丙基壳聚糖对不同类型表面活性剂体系微乳液的形成有不同的影响：（1）除B12BE体系外羟丙基壳聚糖的加入均在一定程度上改善了原有体系微乳区的形成和稳定；（2）羟丙基壳聚糖溶液在10，10和5g/L浓度时分别使BRIJ35，CTAB和SDS体系微乳区面积达到最大；（3）羟丙基壳聚糖的加入没有明显改变C12BE体系的微乳区面积。     

二维磁性纳米结构材料的Monte Carlo模拟

运用Monte Carlo模拟方法，通过分折系统自旋序参数与温度的变化关系了解纳米结构材料磁性的特征．计算模拟结果表明，磁性纳米材料具有比同等大小和平均密度的单晶低的居里温度，且在相变过程中往往会出现一些亚稳态．研究结果提供了一种解析金属纳米结构材料特性的重要方法．