长期数值天气预报的滤波方法

在“一种长期数值天气预报方法的物理基础”一文的理论指导下,本文具体地建立了500毫巴高度距平场和地表温度距平场的月预报方法,并给出了预报试验结果,这一尝试性的研究表明,这是长期数值天气预报一条有希望的途径。     

滨州地区SDH网的技术对策和建议

一、SDH的技术优势 我区数字微波本地网自开通运行以来,虽然对通信面貌的改观产生了深远的影响,但以准同步系列PDH为主导,基本上是点对点传输系统的堆积,没有发挥网络的整体效益,网络的灵活性与生存能力     

江苏省中波同步广播网激励器巡回检修总结(摘要)

本文介绍了我省中波同步广播网激励器巡回检修的情况,包括整顿工作程序、检修激励器情况及整顿效果,并提出在整顿过程中的一些体会和看法。     

采用连续电子束进行离子注入硅的退火实验

本文提出了用连续电子束对硼离子注入硅后进行退火的实验偿试,分析了连续电子束退火的一些优点,并指出了它在器件制造工艺中应用的可能性。     

Identification of proteins separated by one-dimensional sodium dodecyl sulfate/polyacrylamide gel electrophoresis with matrix-assisted laser desorption/ionization ion trap mass spectrometry; comparison with matrix-assisted laser desorption/ionization time-of-flight mass fingerprinting

Digests from ten gel bands containing low abundance proteins were analyzed by both matrix-assisted laser desorption/ionization ion trap (MALDI-IT) and matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry (MS) methods. MALDI-TOF techniques were able to identify only one protein from all 10 gel bands, while MALDI-IT identified eight proteins from the same 10 bands. The ability to perform MS/MS experiments with a MALDI-IT instrument leads to protein identifications based on both peptide molecular mass and sequence information, and is much less prone to errors and uncertainties introduced by peptide fingerprinting methodologies in which protein identification is based on peptide molecular masses alone.     

Formation of mono-, bi-, tri-, and tetranuclear Ag(I) complexes of C3-symmetric tripodal benzimidazole ligands

The C3-symmetric tripodal ligand tris(2-benzimidazolylmethyl)amine (ntb) and its alkyl-substituted derivatives tris(N-R-benzimidazol-2-ylmethyl)amine (R = methyl, Mentb; R = ethyl, Etntb; R = propyl, Prntb) react with various silver(I) salts to afford mononuclear [Ag(Prntb)(CF3SO3)].0.25H2O, 1, binuclear [Ag2(Mentb)2](CF3SO3)2.H2O, 2, trinuclear [Ag3(Etntb)2](ClO4)3.CH3OH, 3, and tetranuclear [Ag4(ntb)2(CH3CN)2(CF3CO2)2](CF3CO2)2.2H2O, 4. All four complexes have been characterized by elemental analyses, IR spectroscopy, and X-ray crystallography. The Ag(I) ion in 1 is coordinated to the three imine nitrogen atoms of the Prntb ligand and one oxygen atom of the trifluoromethanesulfonate anion in a distorted tetrahedral environment. Dinuclear 2 has C2 symmetry with each Ag(I) atom trigonally coordinated by two arms of one Mentb and one arm of another. Trinuclear 3 has C3 symmetry with a Ag3 regular triangle sandwiched between a pair of Etntb ligands such that one arm of each ligand is involved in linear coordination about an Ag(I) atom. In the tetranuclear complex 4, two linearly coordinated Ag(I) atoms lying on the molecular C2 axis are bridged by a pair of ntb ligands and the remaining pendant arm of each ntb ligand is attached to another Ag(I) atom whose tetrahedral coordination sphere is completed by an acetonitrile molecule and a chelating trifluoroacetate anion. Complexes 2 and 3 may be regarded as an aggregation of two tridentate ligands by a silver dimer and a trinuclear cluster with weak Ag...Ag interactions, respectively, while in 4 the aggregation of two tripodal ligands by four Ag(I) ions affords a multicomponent internal cavity. The packing modes of complexes 1-3 are dominated by weak supramolecular pi...pi and CH...pi interactions. Hexagonal or square channels are generated in 1 and 2, and a honeycomb layer structure is formed in 3 with solvate molecules and counteranions occupying the voids. The crystal structure of 4 consists of a three-dimensional network consolidated by NH...O and OH...O hydrogen bonds.     

几种分光光度法测定铌的方法比较

光度法测定铌的试剂发展很快,一些灵敏度高、选择性好的试剂不断出现。本文的目的是针对纸上色层分离岩石矿物中铌及其伴生元素比较清楚的特点,通过对硫氰酸盐、PAR、氯代磺酚S、二甲酚橙、溴代连苯三酚红(BPR)、酸性铬蓝K、DSPCF等七种光度法测定铌的方法比较,选择操作简便、灵敏度高、选择性好的测定方法,以适应野外地质分析的需     

二异氰酸酯与偏苯三甲酸酐缩聚合成聚酰胺酰亚胺

本工作用有关模型化合物、红外分析和ln η_r/C初步研究了MDI与TMA溶液缩聚反应机理,发现反应是一个单向缩聚反应,它的重要特征是酰胺与酰亚胺基团同时形成。在反应中随着MDI的过量溶液粘度随之增加以致成为胶冻,凡带活泼氢或含未共事电子的溶剂因可能与MDI加成而不适用,当溶剂的水份>0.16％时,缩聚反应不能正常进行,由于反应中不产生易降解的聚酰胺酸,仅选出CO_2,故缩聚液的贮存稳定性较好,缩聚产物的高温热处理起着继续增长分子量,补充酰亚胺化和改变序态结构的作用。在缩聚体系里加入适量的低分子环氧树脂可使PAI的成型温度约降低80℃。