含有XW_9O_(33)~(9-)(X=As~Ⅲ,Sb~Ⅲ,Bi~Ⅲ)杂多钨酸盐的研究进展

~~1.2　 {As W9O3 3 }2由过渡金属等连接两个 As W9O3 3 9-可形成夹层型结构聚阴离子 .图 2示出了 As2 W2 1O69( H2 O) 6-的结构 [11] ,夹层中的 3个 W可以被其他的过渡金属等离子或基团所取代 ,从而形成单取代、双取代和三取代夹心型化合物 ,如单取代化合物 [As2 MW2 0 O68( H2 O) 2 ]8-( M=Co2 + ,Zn2 + ) [12 ] ,双取代化合物 [( α-As W9O3 3 ) 2 WO ( H2 O) M2 ( H2 O) 2 ]10 -( M =Zn2 + ,Mn2 + ) [13 ] ,[( Hg2 ) 2 WO( H2 O) ( As2 W9O3 3 ) 2 ]10 -[14 ](图 3) ,[{( ph Sn ) 2 O2 }2 H (α- As W9O3 3 ) 2 ]9-…     

缺位Keggin阴离子SiW9O10-34的酯基锡杂多配合物的合成及性质

利用酯基锡与缺位Keggin结构阴离子SiW9O10-34反应,合成了6种新的杂多阴离子有机金属配合物M4H3[(R'OOCCHR"CH2Sn)3(SiW9O37)]·xH2O(M=K+,(CH3)4N+;R'=CH3,CH3CH2;R"=H,CH3;x=6～12).通过元素分析、IR光谱、1H NMR、紫外电子光谱、循环伏安和TGA-DSC热分析等测试手段对标题配合物进行了表征和性质研究,确定该系列化合物为α-Keggin型三取代酯基锡杂多配合物.     

单缺位Keggin结构多酸阴离子-稀土-ATP化合物的合成、表征及抑菌活性

在常规水浴条件下,以单缺位Keggin结构的多酸阴离子(α-SiW11O39)8-为构筑模块,以稀土金属离子为桥,与C10H14N5H2O13P3(ATP)分子连接合成新型的多酸超分子化合物.通过XPS、元素分析、红外光谱、31P NMR的表征及TG曲线的分析,给出所合成化合物的分子结构式为K2LnH2[SiW11O39Ln(ATP*)]·11H2O(Ln=La3 ,Ce3 ,Pr3 ,Nd3 ,Sm3 ,Eu3 ,Er3 ).抑菌实验表明该类化合物具有很强的抑菌活性.     

Keggin型多钼氧酸盐有机衍生物的电子性质与抗病毒活性的密度泛函理论研究

运用密度泛函理论(DFT)方法研究了Keggin型多酸化合物(C5 H13 N2O2)2(H3O)PMo12 O40,(C5 H14 N2 O2)2 SiMo12 O40和(C5 H14 N2 O2)2 GeMo12 O40的几何结构、氧化还原性质.根据多酸化合物对肿瘤细胞的抗病毒活性与其氧化还原能力的关系,比较了目标...     

夹心型多金属氧酸盐的电化学性质及其对亚硝酸根的电催化还原

系统研究了夹心型过渡金属取代Keggin结构的多金属氧酸盐K10 [M4(H2 O) 2 (XW9O34 ) 2 ]·2 0H2 O(M =Zn ,Co,Cu ;X =P ,As)在水中的电化学行为 .结果表明 ,此类化合物的电化学行为较单取代多金属氧酸盐复杂 ,在 pH =4的缓冲溶液中这些化合物均对亚硝酸根的电还原有很好的催化作用 .     

Keggin型杂多阴离子模板诱导超分子包容结构的构建及性质研究

以饱和磷钨酸为原料,溶剂热条件下合成了[HN(C2H5)3]3[N(C2H5)3]2H2[PW12O40].2H2O,这是一例基于Keggin型阴离子的包容结构化合物.X射线单晶衍射表征该晶体结构中Keggin型阴离子起到了模板诱导作用,通过有方向性的氢键作用力引导有机胺分子有序排列构成了无机-有机超分子包容结构.同时对该化合物进行了元素分析、IR,UV,XPS,XRD,TG-DTG以及电化学等性质的研究.     

含有5-氟尿嘧啶的多金属氧酸盐的合成及光谱研究

合成了一种新的含有5-氟尿嘧啶的Keggin型磷钨多金属氧酸盐C4H4FN2O2H2PW12O40* 8H2O,通过元素分析、IR、UV、XRD、183W NMR和TG对其结构进行了表征. IR、UV和XRD图谱表明,该化合物具有Keggin与5-氟尿嘧啶环结构. 183W NMR表明,该化合物中的钨原子处于相同的化学环境中. TG表征结果表明,该化合物具有较好的热稳定性,其热失重分2步完成. 在人肾胚胎细胞系HEK293细胞内,以5-氟尿嘧啶为阳性对照药物,用MTT法对所合成的化合物进行了体外细胞毒性研究,该化合物的TC50为1.48×10-5 mol·L-1,其毒性低于5-氟尿嘧啶.     

一种新型高价锰取代的多金属氧酸盐合成、结构及性质研究

在含有MnⅡ的夹心型多金属氧酸盐水溶液中加入强氧化剂KMnO4,制得一种新型的含有MnⅢ的多金属氧酸盐K5Na3[{MnⅢ(H2O)}2(WO)(H2O) (AsW9O33)2]·18H2O (KNa-1).该化合物的多阴离子结构是基于2个B-α-[AsW9]三缺位Keggin型构筑单元,中间夹着2个{MnⅢ(H2O)}和1个{WⅥO}片段而构成的夹心式构型.对KNa-1进行了变温磁化率测定并采用双核MnⅢ簇为模型进行了拟合,并对该化合物进行了电化学分析.结果表明:KNa-1 中的2个MnⅢ中心存在弱的反铁磁相互作用;化合物中的MnⅢ离子具有不可逆的氧化还原过程.     

新型钼磷酸超分子化合物的合成和性质

首次合成了亚甲蓝的Keggin结构杂多酸超分子化合物 (MB) 3 [PMo12 O40 ]2 ·4H2 O和 (MB) 3 PMo11FeO40·5H2 O .用元素分析 ,IR ,Vis UV ,XRD和TG DTA等方法对标题化合物的结构和性质进行了研究 .结果显示 :杂多阴离子仍保持完整的Keggin型结构 ,有机阳离子与杂多阴离子以静电引力作用形成超分子化合物 ,具有良好的光致变色性能 ,其光致变色是由于钼离子与有机基团间发生了电子转移反应     

超分子化合物[HN(C_2H_5)_3]_2H[PW_(12)O_(40)]·4H_2O的水热合成、晶体结构及电化学性质

利用中温水热技术合成了新型超分子化合物[HN(C2H5)3]2H[PWl2O40]·4H2O,并采用元素分析、红外光谱、单晶X-射线衍射对其进行了表征.晶体学参数:三斜晶系,C2/C空间群,a=2.468 9(5)nm,b=1.083 1(5)nm,c=2.248 2(5)nm,α=90.00°,β=121.094(5)°,γ=90.00°,V=5.148(3)nm3,Z=4,R1=0.045 6,wR2=0.147 1.该化合物的基本结构单元是由2个质子化的三乙胺分子、4个水分子、1个质子和1个Keggin型杂多阴离子[PWl2O40]3-组成.不同结构单元之间通过氢键作用形成一维链状结构,链间进一步通过分子间氢键构成三维超分子结构.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.