LD泵浦微片Nd∶YVO_4倍频绿光激光器

ＬＤ泵浦微片Ｎｄ∶ＹＶＯ４倍频绿光激光器①黄元庆叶艺文梅荣华（厦门大学新技术开发研究所厦门３６１００５）ＬＤ（激光二极管）泵浦固体激光器，是８０年代中期兴起的新技术，近年来发展极为迅速．这种全固化结构的激光器是一种高转换效率、高频率稳定性、窄谱线、微...     

施肥对桃树增产的作用

7年的不同肥料配比试验表明，肥料生产力占桃树总产量的38．59％，其中钾肥对桃树增产的作用最大，占增产比重的20．74％，磷肥的边际产量最高，氮肥的作用较小，只占增产比重的5．37％，因此生产上应增施磷、钾肥，控制氮肥。     

正确处理新疆棉花基地建设中的几个关系

新疆是全国最大的棉花产区,自然优势和生产潜力巨大,具有广阔的市场前景.本文从新疆大力发展棉花生产的优势和潜力入手,以经济学和地理学理论论述了建设新疆棉花生产基地所应处理好的四个关系,并对此提出建设性意见.     

银杏叶中黄酮类化合物的提取研究(Ⅰ)——溶剂选择

本文对银杏叶用不同浓度乙醇溶液热浸和冷浸两种方法进行了提取黄酮类化合物的试验，结果表明热浸６０％乙醇为溶剂、冷浸７０％乙醇为溶剂时浸取效果最佳。     

巨型模锻水压机立柱应力在线检测及保护系统

通过对100MN多向模锻水压机的立柱在偏载工况下的受力状态的简要分析,并根据立柱应力特征与水压机的结构特点,提出了一种新型的非接触式立柱应力在线检测方法。以电涡流传感器为基本单元,并采用动态“O”点技术,建立了100MN多向模锻水压机的应力检测与保护系统及其软件。实验研究及应用表明,所研制的系统具有良好的稳定性和抗干扰能力,同时很好地抑制了零漂对检测精度的影响,该检测方法可应用于大型机械(轧机、挤压机等)封闭框架应力的间接检测。     

α-淀粉酶的超滤研究

对用超滤法浓缩分离α-淀粉酶过程进行了研究,讨论了料液浓度、膜面液体流速、操作压力等因素对超滤过程的影响。实验结果表明,用醋酸纤维素超滤浓缩α-淀粉酶的过程可用扩散模型来描述,超滤时宜控制压力在0.3～0.4MPa范围内。用超滤法能有效地浓缩α-淀粉酶,酶的总回收率大于90％。此外,通过实验建立了分离过程的传质模型,为超滤法浓缩α-淀粉酶的工业设计提供了依据。     

The strong cooperativity of dioxygen binding by dicobalt (II) diporphyrin compounds in nonaqueous solution at room temperature

Thermodynamic data were determined for the reversible binding of O₂ to two compounds of dicobalt(II) di(meso-tetra-phenyl)porphyrin derivatives with different lengths of diamidoaliphatic bridge (abbreviated to Co₂PP₈ and Co₂PP₄) in N,N-dimethylformamide at room temperature. The partial pressure of dioxygen necessary for half-oxygenation (P _1/2) and hill coefficient (n) at 298 K were determined as follows:P _1/2=54.2 kPa,n=2.0 for Co₂PP₈ andP _1/2=6.8 kPa,n=1.8 for Co₂PP₄, respectively. The rate equations of reversible oxygen binding by Co₂PP₈ were determined and the reaction path was proposed. The results of ther-modynamic and kinetic studies indicate that there exists strong cooperative effect during oxygenation of the compounds. The ESR observation reveals that the dioxygen complexes formed in the solutions are of superoxo (Co-O ₂ ⁻ ) type. Supported by the Research Foundation of the State Education Commission of China Zhou Xiaohai: born in 1962, Ph.D. Associate professor     

Collaborative applications based on the internet

The basic concepts of collaborative applications and some relevant aspects about network communications are introduced. With the examples of some collaborative applications developed by us, several technical problems about collaborative applications, such as loss of data packets, unknown IP address and timedelay, are discussed in detail. And the methods of solving these problems are also provided. Supported by International Cooperation Project (Japan, Jincheng Co. Ltd) Fang Rui: born in 1975, Graduate student