Syntheses of chromium pentacarbonyl derivatives of arsenic(V) and antimony(V). contrasting chemical reactivity with organic halogen derivatives

We have synthesized a new series of chromium-group 15 dihydride and hydride complexes [H(2)As(Cr(CO)(5))(2)](-) (1) and [HE(Cr(CO)(5))(3)](2)(-) (E = As, 2a; E = Sb, 2b), which represent the first examples of group 6 complexes containing E-H fragments. The contrasting chemical reactivity of 2a and 2b with organic halogen derivatives is demonstrated. The reaction of 2a with RBr (R = PhCH(2), HC triple bond CCH(2)) produces the RX addition products [(R)(Br)As(Cr(CO)(5))(2)](-) (R = PhCH(2), 3; R = C(3)H(3), 4), while the treatment of 2b with RX (RX = PhCH(2)Br or HC triple bond CCH(2)Br, CH(3)(CH(2))(5)C(O)Cl) forms the halo-substituted complexes [XSb(Cr(CO)(5))(3)](2-) (X = Br, 5; X = Cl, 6). Moreover, the dihaloantimony complexes [XX'Sb(Cr(CO)(5))(2)](-) can be obtained from the reaction of 2b with the appropriate organic halides. In this study, a series of organoarsenic and antimony chromium carbonyl complexes have been synthesized and structurally characterized and the role of the main group on the formation of the resultant complexes is also discussed.     

CO在铜基催化剂上活化及助催剂作用本质的量子化学研究

提出了CO在助促和非助促的铜基催化剂上吸附活化的两种活性中心原子族模型Cu_5和Cu_4M~(n+)O。应用电荷自洽离散变分X_a近似计算方法对CO在这两种模型上活化本质,并对过渡金属助催剂离子M~(n+)(从ⅣA—ⅧA族中各选一个V~(3+),Ti~(3+),Fe~(3+),Mn~(2+),Mo~(4+))与合成甲醇铜基催化剂上金属铜原子相互作用的本质及其对CO活化的效应进行量子化学研究。计算表明CO是以碳端吸附在活性中心模型Cu_4M~(n+)O中的Cu(1)原子上,并向助催剂M~(n+)离子倾斜45°。从吸附态CO—Cu_5和CO—Cu_4M~(n+)O的原子簇轨道,态密度以及C—O间重选集居数的计算结果指出,CO分子受到活化。助催剂与催化剂中铜原子间相互作用影响了铜原子的价态,改变体系E_f能级,改善了前线轨道HOMO与CO 2π~*轨道的匹配,从而增加d电子的反馈,降低CO间的重选集居数,促进了CO的活化。     

论温泉旅游的创新开发

近年来，温泉旅游发展迅速，但温泉旅游开发模式和活动项目的雷同化现象十分严重，从社会需求、温泉产品形象、温泉设计理念、温泉经营管理等方面都要求对温泉进行创新开发，温泉旅游开发的创新途径是主题创新、表现形式创新、内容创新和管理创新，只有这样温泉旅游才能可持续发展。     

基于Web的高校饮食生产管理信息系统设计

开发了一套基于Web的高校饮食生产管理系统,5大子系统所构成的应用软件主体,几乎覆盖了高校饮食的所有日常生产管理功能.阐述了该系统的设计和实现过程,包括系统的特点,系统的结构,系统的功能设计,数据库结构设计,用户界面设计等内容.     

基于光纤布喇格光栅调谐的增益控制掺铒光纤放大器

在掺铒光纤放大器的输人端和输出端分别接入一个波长相同的光纤布喇格光栅，利用简支梁波长调谐的方法调节两布喇格光栅波长的间距，在一定范围内，实现了增益大小可调的增益控制．在增益控制范围内，EDFA的增益控制在0．4dB之内。     

Discovery of the granulite xenoliths in Cenozoic volcanic rocks from Hoh Xil,Tibetan plateau

Two-pyroxene granulite and clinopyroxene granulite xenoliths have been recently discovered in the Late Paleogene toNeogene volcanic rocks (with ages in the range of 4.27～44.60 Ma) that outcropped in Hoh Xil, central Tibetan plateau. Based on theelectron microprobe analysis data, the xenoliths provide constraints for the formation equilibrium temperatures of the two-pyroxene gran-ulite being about 783 to 818℃ as determined by two-pyroxene thermometry and the forming pressure of the clinopyroxene granulite beingabout 0.845 to 0.858 GPa that is equivalent to 27.9～28.3 km depth respectively. It indicates that these granulite xenoliths represent thesamples from the middle part of the thickened Tibetan crust. This discovery is important and significant to making further discussion onthe component and thermal regime of the deep crust of the Tibetan plateau.     

小波分析在管道泄漏信号识别中的应用

利用多尺度小波变换 ,把管道泄漏产生的负压波信号作为瞬态信号 ,来识别管道的局部泄漏特征。以光滑函数的一阶导数作为小波母函数 ,研究了管道泄漏特征信号拐点区间的敏感性 ,突出小波变换系数的局部极值性。分析表明 ,检测信号的小波变换系数极值的奇异性准确地反映了管道检测信号的泄漏特征 ,并且从局部描述了管道泄漏信号的瞬态正则性。对各级尺度系数进行了S形曲线拟合 ,此曲线能够完整地描述管道泄漏瞬变特征 ,其拐点区间描述了管道发生泄漏时的瞬变过程。     

New geological evidence of crustal thickening in the Gangdese block prior to the Indo-Asian collision

Recent mapping in the Gangdese block has revealed many leucogranites that are similar to those in the High Himalaya. These leucogranites formed at ～140 Ma as indicated by monazite Th-Pb ion-microprobe dating and cooled at ～130 Ma as indicated by muscovite ^40Ar/^39Ar dating. In conjunction with previous structural and paleogeographic studies, the new data indicate that the Gangdese block underwent crustal thickening and associated exhumation during ～140—130 Ma. In this regard, the southern margin of Eurasia continent was comparable to the modern South American Altiplano-Puna plateau, the prime example of active ocean-continent subduction and associated thickened crust. Specifically, the early stages of crustal thickening and uplifting of the Gangdese block may result from subduction of the Neo-Tethyan Ocean. If the Tibetan Plateau would form by accretion of a series of blocks with thickened crust, an elevated topographic plateau similar to the Altiplano-Puna plateau had formed before collision between the Indian and Eurasian plates. Then the Tibetan Plateau would have quickly thickened, uplifted, and begun to extend soon after onset of the collision. Thus, the deformational mechanism of the Tibetan Plateau is not distributed shortening, but rather concentrating deformation within regions of thin crust between the accreted blocks.     

保护渣性能对结晶器内传热的影响

在实验室模拟研究了结晶器内酸性保护渣的传热情况。结果表明：增加保护渣的粘度、提高保护渣的凝固温度，结晶器与坯壳之间渣膜的传热系数和热流密度都减小而热阻增加，通过调整保护渣的性能，可调节渣膜的传热系数，使其适应连铸坯生产的要求。     

信息化与工业化

以信息化带动工业化，是我国加速现代化建设的重要任务，我国在推进信息化的过程中，一定要大力推进技术创新，努力掌握核心信息技术，发展自主知识产权，以信息化带动工业化，就是带动工业化的制造业，尽快提升中国制造业的竞争能力，是我们努力的方向。