水质分析中的精密度─偏性分析质量控制试验

通过对“铬酸钡比色法测定水中硫酸盐”分析方法进行的精密度、偏性试验,介绍了该试验在水质分析质量控制中的应用．     

离散正交小波包及其在噪声抑制中的应用

研究有限长序列的小波包处理和噪声抑制的方法,方法用正交共轭滤波器构造有限维内积空间的正交值和分解及有限长离散小波包,分析了噪声的小波包分解系数的特性,并提出小波包变换域降噪的方法。     

分形编码中的最优压缩映射

提高传统分形压缩编码的性能。方法将分形变换编码建模为一个不等式约束条件下的非线性规划问题,将压缩射条件作用到最优射的求解过程中,得到全局意义上的最优压缩映射,给出了该模型及相应的求解算法,对算法收敛性,初始点选择等问题进行了讨论。     

一种神经网络实现GPS导航定位算法

目的 研究ＧＰＳ接收机状态解算的估计方法。方法 利用Ｈｏｐｆｉｅｌｄ神经网络对ＧＰＳ接收机数据进行处理,结果 以统计自述平均误差和均方根误差作为衡量性能的指标,神经网络方法与迭代量小均方误差算法相比较定位误差减小,结论利用神经网络实现ＧＰＳ接收机状态解算是可行的,且与迭代最小均方误差算法比较,可提高定位精度。     

1,6—二磷酸果糖制备研究：Ⅰ.菌种的筛选及培养条件

介绍了１,６－二磷酸果糖产生菌的筛选和最佳培养条件的确定,在所筛选的菌种中９５１８、９５１９号菌株均具较高的产１,６－二磷酸果糖酶系活力。其最佳培养条件为：培养温度２８℃,ｐＨ６．５。     

The discovery of early Permian reef belt in east Kunlun and its significance

The early permian reef belt is distributed in the southern side of eastern Kunlun, north area of Qinghai-Tibet Plateau. The core-reef facies of thc reel extends from Tuosuo Lake to Huashixia. Lots of reef breccia was found at the southern slope of the mre-reef belt, and to the north of the reef belt there is back-reef limestone. Cacisponges, hydrozoa, bryozoa,Tabulozoa, Tubiphytes and red algae are the main frame-building organisms.Archaeolithoporella, laminated blue-green algaes,Tabulozoa andTubiphytes played a role of binding or encrustating. There are many kinds of epibiont in the mf, including brachiopod, gasterid, foraminifera, echinoderm and simple coral. The type and the characteristics of the reef-building organisms in eastern Kunlun and Animaqing are basically thr same as those in the south of Chi     

Effect of lanthanum ions on tRNAphe structure: Imino proton NMR spectroscopy

The effect of lanthanum ions on the structural and conformational change of yeast tRNA Phe was studied by 1H NMR. The results suggest that the tertiary base pair (G-15)(C-48), which was located in the terminal in the augmented dihydrouridine helix (D-helix), was markedly affected by adding La 3+ and shifted 0.33 downfield. Based pair (U-8)(A-14), which is associated with a tertiary interaction, links the base of the acceptor stem to the D-stem and anchors the elbow of the L structure, shifted 0.20 upfield. Another imino proton that may be affected by La 3+ in tRNA Phe is the tertiary base pair (G-19)(C-56). The assignment of this resonance is tentative since it is located in the region of highly overlapping resonances between 12.6 and 12.2. This base pair helps to anchor the D-loop to the TΨC loop.     

Carbon isotope anomaly in marbles associated with eclogites from the Dabie Mountains

This is a report of carbon isotope anomaly in marbles associated with the UHP eclogites from the Dabie Mountains. The results place constraints on the degree of crust-mantle interaction during the UHP metamorphism.     

TS分子筛的催化氧化性能研究：Ⅲ.苯酚氧化制苯二酚

研究了自合成的钛硅分子筛（ＴＳ－１）对Ｈ２Ｏ２氧化苯酚制苯二酚反应的催化活性。对反应的温度、时间、催化剂用量、酚：Ｈ２Ｏ２等因素进行了考察：在催化剂用量为苯酚的１０％、酚：Ｈ２Ｏ２（ｍｏｌ）为３：１时,经５７℃／６ｈ反应,Ｈ２Ｏ２的转化率和对产物苯二酚的利用率可达９０％和８０％,还观察到,分子筛的晶粒大小对苯酚的氧化活性影响较大,大晶粒催化剂的内表面利用率较低,从而影响催化活性。     

射流携带床气化炉内混合过程的数值模拟

采用ｋ－εＥ模型对射流携带床气化炉内α－萘酚与对氨基苯磺酸重氮盐的偶合竞争串联反应的分隔指数进行了数值模拟,研究了气化炉出口面积,长径比,两股射流动量比对分隔指数的影响。模拟结果表明,ｋ－ε－Ｅ模型由于同时考虑了宏观混合和微观混合的作用,其观测值和实验测试值吻合较好。