希夫碱钛配合物/三异丁基铝催化MMA本体聚合

经希夫碱缩合反应,制得水杨醛亚胺配体(1),其Na盐分别与TiCl4和CpTi-Cl3反应合成了新型希夫碱钛配合物{3,5-di-Br-2-(O)C6H2CHN[2(O)C6H4]}TiCl2(2);{3,5-di-Br-2-(O)C6H2CHN[2(O)C6H4]}[TiCl(C5H5)](3).以GC-MS,1HNMR和元素分析对中间产物及配合物进行了表征.以Al(i-Bu)3为助催化剂,详细考察了聚合时间、温度、Al/Cat和MMA/Cat的摩尔比对催化MMA本体聚合的影响.两个催化体系的聚合转化率均可以达到62%左右.2/Al(i-Bu)3(A)催化体系在聚合条件MMA/Cat(摩尔比)=2 000,Al/Cat(摩尔比)=20,T=60℃,t=15 h下,Mη可以达到3.6×105,相对分子质量分布2.14;3/Al(i-Bu)3(B)催化体系在相同聚合条件下,Mη可以达到4.3×105,相对分子质量分布2.44.红外光谱分析表明,A,B两个催化体系所得的PMMA的间同含量分别为85%和86%左右.     

新型铁系催化剂催化制备高相对分子质量宽/双峰聚乙烯

合成了配合物3([2,6-R2-C6H3N=C(CH3)C5H3N(CH3)C=N(3,5-R2)C6H2-CH2-(3,5-R2)C6H2N=C(CH3)C5H3N(CH3)C=N(2,6-R2)C6H3][FeCl2]2(R=i-C3H7)).经甲基铝氧烷(MAO)或三乙基铝(AlEt3)活化,配合物3对乙烯聚合表现出较高的催化活性,得到高相对分子质量的宽/双峰聚乙烯,且聚乙烯中高相对分子质量部分占优势.此外,所得聚乙烯具有较高的熔点和结晶度.13C NMR核磁共振表征显示,所得聚合物为线性聚乙烯.     

二价二(叔丁基环戊二烯基)钐对4-乙烯基吡啶的催化聚合研究

首次探索了二价(t-C4H9C5H4)2Sm对4-乙烯基吡啶的催化聚合性能,发现二价(t-C4H9C5H4)2Sm可以单组分高效催化4-乙烯基吡啶的聚合,而且聚合物分子量一般在1O×105以上.在20℃至70℃温度范围内,催化聚合活性随单体浓度和聚合温度的提高而提高.     

取代茚基二价稀土配合物催化甲基丙烯酸甲酯的聚合

较系统地研究了取代茚基二价稀土配合物(1—C5H9C9H6)2Sm(THF)作为单组分催化剂，催化MMA的聚合反应。结果表明，催化剂在较宽的温度范围显示出较高的催化活性，在以甲苯为溶剂的催化体系中加入少量的极性溶剂THF，聚合活性有显著的提高，温度降低MMA的转化率增加，所得PMMA的分子量升高，分子量分布变窄，几种取代茚基二价稀土配合物都显示了较高的催化活性，其活性次序为：(1—PhCH2C9H6)2Sm(THF)2＜(1—C5H9C9H6)2Yb(THF)2＜(1—C5H9C9H6)2Sm(THF)＜(1—C2H5C9H6)2Sm(THF)2。中性取代茚基二价稀土配合物所得聚合物主要为间同立构的PMMA，而由离子型的二价稀土配合物KSm(1—C5H9C9H6)3(THF)3所得到的为无规立构PMMA。     

胍基稀土硼氢化物的催化聚合性能

研究了胍基稀土硼氢化物 [Ph2NC（NCy）2]Ln（BH4）2 [Ph=C6H5, Cy=C6H11, Ln=Er（1）、Yb（2）]、 [（Me3Si）2NC（NCy）2]Ln（BH4）2 [Ln=Er（3）、 Yb（4）] 和 [（Me3Si）2NC（NCy）2]2LnBH4 [Ln=Er（5）, Yb（6）]催化甲基丙烯酸甲酯的聚合性能，其活性顺序为5〉6〉3〉4～1～2，说明胍基配体的供电性越强，配合物的催化活性越高。还研究了1和2催化丙烯腈聚合的性能。实验表明，胍基稀土硼氢化物也是催化丙烯腈聚合的良好催化剂。     

C6H5CH2C5H4NdCl2·3THF的合成及催化聚合活性研究

合成了苄基环戊二烯基二氯化钕配合物(C6H5CH2C5H4NdCl2·3THF).用元素分析、红外光谱分析对其结构进行了表征,该配合物与三乙基铝(AlEt3)组成的催化体系催化丁二烯聚合,单体转化率达85%.     

Ai(i-Bu)3-La(AA)3-H2O催化的环氧乙烷聚合作用

详细研究了在Al(i-Bu)3-La(AA)3-H2O的催化下环氧乙烷的均聚反应和与环氧丙烷的共聚反应情况.实验发现在该催化剂的作用下,以甲苯为反应介质,在n[Al(i-Bu)3]∶n[La(AA)3]为16～10,n[Al(i-Bu)3]∶n[H2O]为1∶(1～3),n(单体)∶n[La(AA)3]为1000∶(1～3),n(单体)∶n[Al(i-Bu)3]为100∶(1～3),45℃预聚2h,85～90℃聚合10h的条件下,催化剂的活性高,聚合速率大,所得产物的平均相对分子质量高.以水为溶剂,在30℃测得环氧乙烷均聚物的v=310×104;在m(环氧乙烷)∶m(环氧丙烷)为195∶15时,其共聚物的v=380×104,且产物有较好的水溶性.     

含吡啶基β-烯酮亚胺NNO型钇双胺基配合物的合成及其催化异戊二烯聚合研究

通过4-[(2-吡啶基)乙亚胺基]-2-戊烯-2-醇(1)与[(Me3Si)2N]3Y(μ-Cl)Li(THF)3的反应,制备含吡啶基β-烯酮亚胺NNO型钇双胺基配合物(2),采用1 H NMR,13 C NMR,元素分析,X-ray和IR等对该配合物进行了表征,并探索了其在催化异戊二烯聚合中的应用.结果表明,配合物2在催化异戊二烯聚合方面有较好的催化活性和立体选择性.     

几个二价稀土金属配合物的催化甲基丙烯酸甲酯聚合反应活性研究

研究了二价稀土金属配合物(η5:η1-C9H6CH2CH2CH2NMe2)2YbII(1),[{η5:η5:η1-(C9H5CH2SiMe2NC4H8)2}EuI2I(μ-Cl)]2[μ-η3:η5:η1:η3:η5:η1-(C9H5CH2SiMe2NC4H8)2].C7H8.(C6H6)0.5(2),and[η5:η1-C9H6CH2SiMe2NC4H8]2YbII(3)催化甲基丙烯酸甲酯聚合活性.探索了催化剂与MMA单体摩尔比、溶剂的极性、温度对MMA聚合反应的影响.     

脲酶模型化合物合成、表征及对尿素水解的影响

报道了对称六齿配体N,N,N＇,N＇-四(2′-苯并咪唑甲基)乙二胺(EDTB)的两种含镍(I)配合物[Ni(EDTB)](ClO4)2@3H2O和[Ni(EDTB)]C12@2H2O@3C2H5OH的合成、表征及其对尿素水解的影响.根据配合物元素分析、摩尔电导、紫外-可见(UV-Vis)、红外(IR)、ESR谱和循环伏安(CV)等性质与已测X-射线单晶结构的同种配体含铜(I)单核配合物比较,推测此两种配合物中的Ni(I)离子被配体EDTB的4个苯并咪唑(Bzim)氮和2个烷胺氮配位,形成一种畸变八面体几何构型.并用气相色谱法观测了此两种配合物对尿素水解反应的影响,结果表明它们几乎无催化尿素水解的活性,证明配位饱和可以抑制脲酶活性.     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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.