聚并苯同系分子的能量和电子极化率的同系线性规律

聚并苯同系物的导电性与其结构之间关系的研究是理论化学的领域之一，用聚并苯同系物的能量，电子极化率和同系序数分别表征其稳定性，导电性和结构参数，经研究发现，聚并苯同系物的能量，全价电子极化率（a)和π电子极化率（aπ）以及π电子极化率中全价电子极化率的比例（aπ/a(%)）与同系序数（N）之间满足同系线性规律。π     

基于酞菁铅的有机平衡双极型场效应晶体管

有机场效应晶体管(OFETs)分为单极性和双极性.单极性OFETs仅能工作在p-沟道(空穴型导电沟道)或者n-沟道(电子型导电沟道模式下,然而双极型OFETs可以通过改变栅压的极性在p-沟道和n-沟道模式之间转变.双极型OFETs由于其在有机互补型集成电路(ICs)方面潜在的应用而得到越来越多的研究.这些电路有很多优点,例如功率损耗小、器件制作和电路设计成本低.     

莫比乌斯型环多并苯(Mbius[n]cyclacenes,n=7～10)的开壳单态双自由基特性研究

采用密度泛函结合对称性破损(DFT-UBS)方法研究了莫比乌斯型环多并苯(Mbius[n],n=7~10)的结构、稳定性及其开壳单态双自由基特性,为莫比乌斯型单层纳米管材料和自旋器件材料的基础研究提供理论依据。计算结果表明,随着融合六元环数目n的增加,莫比乌斯型环多并苯体系的基态由闭壳型(CS)单态慢慢变为了开壳型(OS)单态;Mbius[7]和Mbius[8]的基态是CS单态;而Mbius[9]和Mbius[10]的基态是OS单态,即Mbius[9]和Mbius[10]的基态具有典型的单态双自由基特征。     

乙酰丙酮镁对有机场效应晶体管迁移率的影响

载流子迁移率是有机场效应晶体管(OFETs)的重要参数,直接决定了OFETs的功率和工作频率,对电子纸和射频标签等实际应用起到至关重要的作用。为了提高以聚(3-己基噻吩)(P3HT))和聚苯乙烯(PS)的混合物作为半导体材料的OFETs的载流子迁移率,提出利用结晶的乙酰丙酮镁来诱导P3HT在界面处结晶的方法。研究了使用不同量的乙酰丙酮镁掺杂的热交联聚乙烯基苯酚(CPVP)作为介电材料时OFETs性能的变化。结果表明,当在常用介电材料CPVP中掺杂适量乙酰丙酮镁(质量分数为0.6%)作为介电层时,器件的载流子迁移率达到最大(2.88×10-2 cm2/(V·s)),是单纯使用CPVP介电层时迁移率的11倍。     

杂原子多环芳烃的合成

以2-己基-1-癸醇(2)为起始原料,依次经Appel反应、Williamson反应、溴取代反应、Suzuki偶联反应、三聚反应、Scholl氧化脱氢关环反应得到含硫原子的目标化合物1a.采用类似合成方法,合成目标化合物1b.这些化合物的结构均通过核磁共振(~1 H NMR)和基质辅助激光解吸电离飞行时间质谱(MALDITOF MS)表征,并对其光谱特征、热性能及电学性能进行了初步的研究.从紫外荧光光谱中可知这类化合物在甲苯中呈现砖红色荧光,可作为一种新型的砖红色主体发光材料,用于荧光传感器等光电材料.热失重分析结果表明这类化合物热稳定性良好,有望应用于对热稳定性要求较高的有机纳米器件.另外,由循环伏安曲线可知此类杂原子多环芳烃是强电子供体,在光伏器件中有着潜在的应用前景.     

1,3,4-噁二唑衍生物的合成研究进展

1,3,4-噁二唑衍生物作为一类重要的杂环化合物,具有独特的生理和光学活性,在医药、农业、材料等领域的应用日益受到关注.因此,1,3,4-噁二唑衍生物的合成也成了人们研究的热点.文章综述了近年来合成1,3,4-噁二唑衍生物的传统方法、新方法、新试剂及新技术.     

并苯化合物键长与成键能的相关性

本文根据成键能概念及最大成键能原理，求得并苯化合物中Ｃ—Ｃ各键的成键能，并得出其与相应键长有线性关系ＲＡＢ（Ａ）＝１．５３０－０．０７２ＥＡＢ．说明了成键能的概念在化学领域应用广泛．     

复合多铁体1-xBi_（0.85）La_（0.15）FeO_3-xCoFe_2O_4性能的研究

多铁性材料是一类同时具有（反）铁电、（反）铁磁及铁弹中两者或两者以上耦合性质的材料。近些年来,由于其在多功能器件中的潜在应用而引起了人们极大的兴趣。多铁性材料可分为单相多铁性材料和复合多铁性材料。复合多铁性材料由于其独特的优势而目前被人们广泛的研究。     

王冠化合物的合成

王冠化合物(Crown Compounds)系一类大杂环化合物,在杂环内含有重复的Y-CH_2-CH_2单位,其中Y是杂原子如氧、硫、氮、磷等,有的也可以是-CH_2-基团。可以是含单一杂原子的杂环,也可以是含混杂原子的杂环。有单环王冠化合物,也有多环王冠化合物。例如:     

聚并苯半导体材料的研制

自从发现聚乙炔膜经掺杂电导率大大提高后,人们对有机导体进行了广泛的研究。由于聚乙炔膜在空气中易氧化降解而限制了其实用性,所以人们都在努力探索新的在空气中稳定的有机导电材料的研制。本课题研制的聚并苯半导体材料是一种在空气中极其稳定的不经掺杂其电导率就很高很有实用价值的新材料。     

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.