双组份共混聚合物的中间相

本文综述了双组份共混聚合物的中间相研究进展.重点介绍了结晶-非晶中间相的晶格理论模型及由此而得出的结论,并对中间相的实验证明作了探讨.     

BMO与弱核条件下的Calderón-Zygmund算子交换子的有界性

本文证明了BMO与弱核条件下Calderón-Zygmund奇异积分算子的交换子 [B,T]f=BTf-T(Bf)的L2有界性,这里B ∈BMO,T对增生的b1,b2,满足 T(b1)∈BMO,T*(b2)∈BMO,b2Tb1∈WBP．     

THE FABRICATION OF CARBON AEROGELS BY GELATION IN ISOPROPANOL WITH BASIC CATALYST

1.INTRODUCTIONIn1987,Pekalapatentedthefirstorganicaerogel,i.e.resorcinol-formaldehydeorganicaerogel,undercarbondioxidesupercriticalcondition[1],whichcanbepyrolyzedinaninertatmospheretoformcarbonaerogelduetoahighlycrosslinkingstructure[2].Duetotheiruniquemicrostructureconsistingofporesandparticleswithnanometersize,carbonaerogelsareexpectedtobeusedasthermalandphonicinsulators,electricdoublelayercapacitors,chromatographicpackings,adsorbents,andcatalystsupports[3,4].Uptonowhowever,carbonaerog…     

卟啉类化合物液相基体激光解吸质谱研究

本文叙述了使用液相基体帮助激光解吸质谱新方法对一系列卟啉类化合物分析研究工作。分别使用硝基苯辛醚和15-冠(醚)-5两种液相基体获得了一系列卟啉类化合物的激光解吸质谱,并对其特点进行了讨论所用方法绝对灵敏度优于0.5 ng。此外,还成功地对多至六个组分的卟啉类化合物进行直接解吸质谱分析。结果表明新的液相基体帮助激光解吸质谱法对卟啉类化合物分析有十分优异的“软”电离特性。     

The structural characterization of some palladium (Ⅱ) complexes of 1,10-phenanthroline and amino acids by NMR spectroscopy

The complexes [Pd(phen)(aa)]Cl.3H2O, where phen is 1,10-phenanthroline and aa is the anion of glycine (gly), .DL-alanine (ala), DL-serine (ser) or DL-asparagine (asn), were synthesized and characterized by spectroscopies. The NMR signals were assigned completely on the basis of the double irradiation, 1H-1H COSY and 1H-13C COSY techniques. In the 1H NMR spectra of phen in the complexes, the signals of 2-H and 9-H show upfield shifts 0.8-1 ppm, while the signals of 4-H and 3-H show downfield shifts or almost no shift, as compared to the free phen ligand, and the signal of 4-H appears in the lowest field. The signals of ring B which is trans to the carboxyl group show significant upfield shifts as compared to those of ring A. The probable structures were described on the basis of a metal-non-bonded hydrogen interaction, trons effect and ligand-ligand interaction. There may exist three conformation isomers in the [Pd(phen)(asn)]Cl.3H2O complex at room temperature. The preferred conformation isomer is about     

离子色谱法测定NO_2~－时Cl~－的干扰及消除

研究了氯离子对化学抑制型高效离子色谱法测定亚硝酸根时的干扰。当亚硝酸根的浓度大于２．０ｍｇ／Ｌ时，５．０ｍｇ／Ｌ的氯离子不会对亚硝酸根的峰高信号产生明显的干扰；但当亚硝酸根浓度小于０．５０ｍｇ／Ｌ时，即可引起正干扰。该正干扰随着Ｃｌ~－／ＮＯ~－２浓度比的增加而迅速增大，但与流动相的流速（在２．５～３．０ｍＬ／ｍｉｎ之间）无关。还对４种可能消除氯离子干扰的方法进行了讨论。     

Spatially and temporally resolved IR-DFWM measurement of HCN released from gasification of biomass pellets

For the first time, to the best of the authors’ knowledge, nonintrusive quantitative measurement of hydrogen cyanide (HCN) released during the devolatilization phase of straw pellets gasification is demonstrated with high spatial and temporal resolution. Mid-infrared degenerate four-wave mixing (IR-DFWM) measurements of HCN were performed by probing the interference-free P(20) line in the v₁ vibrational band at around 3?µm and the IR-DFWM signal was detected with an upconversion-based detector, providing discrimination of thermal noise and increased sensitivity. A novel single-pellet setup consisting of a multi-jet burner was used to provide hot flue gas environments with an even and well-defined temperature distribution, for single straw pellet gasification at atmospheric pressure. The environments had temperatures of 1380?K, 1540?K and 1630?K with a constant oxygen concentration of 0.5?vol%. In order to quantify the amount of HCN released during the devolatilization of straw pellets, calibration measurements were performed in well-defined HCN gas flows. Selected hot water lines were probed with IR-DFWM in the interrogated volume to obtain the instantaneous temperature, which were used to correct the temperature effect. HCN concentrations up to 1500?ppm were detected during the devolatilization stage, and the results indicate a strong temperature dependence of the HCN release.     

自相似集的质量分布原理与Hausdorff测度及其应用

本文提出了满足开集条件的自相似集的质量分布原理.作为应用,得到了计算一类满足开集条件的自相似集的Hausdorff测度的准确值的方法,并举例说明了此方法对于计算一类满足开集条件的自相似集的Hausdorff测度的准确值是行之有效的.     

爆炸烟云扩散的时空分布模型及特性

针对爆炸烟云扩散的时空分布问题,在严格限定实验条件的前提下,设计并开展了不同当量、不同地面条件、不同炸药装置壳体厚度的3组TNT爆炸烟云扩散外场实验,获得了不同实验条件下烟云扩散时空分布数据,运用计算流体力学(computational fluid dynamics, CFD)对爆炸烟云的扩散过程进行了数值模拟。通过分析实验和数值模拟获取的烟云时空分布数据,得到了烟云扩散形态演变过程及浮力流场信息,确定了厚水泥地面条件和硬质地面条件下不同的爆炸烟云扩散高度分布模型。研究结果表明:采用实验与数值模拟相结合的方法来表征烟云时空分布模型是科学可行的,爆炸烟云高度随时间呈1/2次幂函数增长,烟云宽度短时间内几乎呈线性扩展,烟云温度随时间呈反比例函数衰减,爆轰地面条件和炸药装置壳体厚度对烟云扩散高度均有不同程度的影响。     

离子色谱法测定大气总悬浮颗粒物中的F~-,Cl~-,NO_3~-及SO_4~(2-)

介绍了用离子色谱法测定大气总悬浮颗粒物（TSP）中的F~－,Cl~－,NO~-_3及SO~2-_4。对过氯乙烯采样滤膜用去离子水（DIH_2O）作为提取液进行超声波提取。方法的平均回收率分别为F~-98．7％,Cl~-103％,NO~-_3101％及SO~2-_499．8％,相对标准偏差为F~－0．29％,Cl~－0．32％,NO~-_30．30％及SO~2-_40．25％。