Highlights of recent advances in functional coordination polymers made in China

Coordination polymers (or metal-organic frameworks, MOFs), as one of the essences of crystal engineering and coordination chemistry, have attracted considerable atten-tion from chemists,     

Identification of AtSM34, a novel tonoplast intrinsic protein-interacting polypeptide expressed in response to osmotic stress in germinating seedlings

Aquaporins are implicated in a wide variety of plant physiological processes, although the mechanisms involved in their regulation are not fully understood. To gain further insight into the regulatory factors involved in this process, we used a yeast two-hybrid system to screen for potential binding partners to the Arabidopsis tonoplast intrinsic protein (TIP) AtTIP1;1. This was the first protein identified to be associated with high water permeability in vacuolar membranes from Arabidopsis thaliana. Using ...     

Revisit the K-segment of the Southeast Indian Ridge for new evidence of hydrothermal plumes

During the first leg of a Chinese research cruise to the Southeast Indian Ridge (SEIR) in 2007, we revisited the K-segment of the SEIR and observed a water column turbidity anomaly at a CTD cast station. This station was located ~400 m from a dredge site on a plume anomaly detected in 1996 by US scientists. The characteristics of the turbidity anomaly detected in our survey are different from those observed 11 years previously, implying that either the detected anomalies have distinct and different plume sources or the robustness of the plume has changed in the intervening time. In addition, turbidity anomalies were observed at two localities on the K-segment in a deep tow-yo profile. If these two anomalies are not connected, the plume incidence calculated would be about 0.28, larger than the predicted value of 0.25 for a 65 mm/a spreading rate. This increase in plume incidence on the K-segment seems to be related to the influence of the St. Paul-Amsterdam hotspot, located about 300 km to the northwest.     

求解对流-扩散方程的一类显示交替分组方法

对求解对流-扩散方程初边值问题的第二类Saul’yev非对称格式以及古典显、隐格式进行组合,提出一种新的求解对流-扩散方程的显示交替分组方法,并对新方法进行稳定性分析和数值实验.新方法针对内点为偶数的情况,在节点两端点处用分组格式进行处理,所得解的精度高,稳定性好,容易在并行机上实现.     

苯酚的非线性回归酸碱电位返滴定

在苯酚样品中加入一定量过量ＮａＯＨ标准溶液,再返滴入ＨＣｌ标准溶液若干次,依次测定ｐＨ玻璃电极在样品溶液中的电极电位．根据有关酸碱平衡和物料平衡及非线性回归原理对实验数据进行处理,用牛顿法对非线性回归进行简化计算．测定了试剂苯酚和工业苯酚,结果表明,即使是极弱酸的苯酚也能用非线性回归酸碱电位返滴定进行准确测定．     

稀土·苯氧乙酸·邻菲罗啉三元配合物的研究

合成了钕、钇、镝、镥等稀土 (RE)·苯氧乙酸 (HPOA)·邻菲罗啉 (Phen)三元配合物。用化学分析法研究了它们的组成以及它们在不同溶剂中的溶解性能和摩尔电导等物理性质。用红外光谱、紫外光谱、热重一差热分析和 X射线粉末衍射等方法研究新合成三元配合物的结构及性质。确定了配合物中 RE3 与 POA-、Phen之间的成键特性。配合物通式为 RE(POA) 3· Phen,配合物中 RE3 为 8配位。     

三流异型连铸中间包结构优化的数值模拟

根据西宁特殊钢股份有限公司三流异型连铸中间包的结构和操作参数,提出中间包结构的优化方案,应用ANSYS CFX数值模拟软件计算不同控流装置下中间包内的流场和温度场分布,并建立物理模型对数值模拟的结果进行验证,确定最佳的优化方案。结果表明,原型中间包内流场和温度场分布不均匀,3个水口最大温差达3.11K,导致各水口处铸坯质量存在差异;使用U形挡墙后,中间包内钢液的流动特性得以改善,其成分和温度分布更为均匀,3个水口的最大温差仅为0.20K。     

未成年猕猴最低蛋白质平衡日粮的研究

在笼养条件下, 对４ 组未成年猕猴（共１２ 只） 分别饲喂粗蛋白质含量为Ⅰ组２１．１％ 、Ⅱ组１９％ 、Ⅲ组１７．１％ 和Ⅳ组１４．８％ 的日粮, 试验期１８０ ｄ, 结果表明： ４ 组猕猴平均增重分别为０．６ ｋｇ、０．６ ｋｇ、０．５ ｋｇ 和０．５ ｋｇ; 实验期间各组猕猴血红蛋白、血清总蛋白和血清总脂含量无明显变化。经核算, Ⅱ、Ⅲ和Ⅳ组的饲料成本分别比Ⅰ组下降了７．８％ 、１５．０％和２１．１％ 。从生物学和经济学的观点考虑, 初步认为在本试验条件下, 未成年猕猴日粮粗蛋白质含量以１７．１％ （Ⅲ组） 最合适     

聚焦光束反射分析仪测定淀粉颗粒粒径分布

为了在线监测淀粉在物理或化学处理过程中的粒径变化,研究了淀粉乳浓度、搅拌速率和介质等因素对聚焦光束反射分析仪(FBRM)测定淀粉颗粒粒径分布的影响,分析了不同种类淀粉颗粒的粒径分布曲线以及同种淀粉在不同粒度测定方法下的粒径大小.结果表明:随着淀粉乳浓度的增加,FBRM测得的淀粉颗粒粒径呈现先增加后减小的趋势,淀粉乳浓度为1%时达最大值;搅拌速率对淀粉颗粒粒径测定的影响不显著;采用浓度小于50%的乙醇和异丙醇或浓度高于75%甘油作为介质时,可以得到较为稳定的粒度分布;不同种类的淀粉颗粒具有不同的粒径分布曲线趋势;同种淀粉颗粒在不同粒度测定方法下,粒径大小有一定的差别.     

关于SAOR迭代法的注记

设A是2-循环相容次序阵,其Jacobi阵J的特征值均为实数,记α=ρ(J)>0.本文证明了两个主要结论: (1)SAOR迭代收敛(→)<1且参数ω与γ满足条件0<ω<2,ω-(2-ω)/α<γ<ω+(2-ω)/α,或等价地,{2≤γ<2/α,0<ω<(2-γα)/1-α;-2/α<γ≤2.0<ω<(2+γα)/1+α.(2)以Sγ,ω表示SAOR迭代阵,则:当ω≠1时,p(Sγ,ω)>α2;当ω=1时,p(Sγ,1)=这表明:SAOR迭代的渐近收敛因子是α2,最优参数是ω=1与γ∈[0,2].本文的结果改进了张引的两个相关结论.