纳米乳液改性纳米CaCO3/PVC复合材料的结构和性能研究

研究了纳米聚丙烯酸酯微乳液改性纳米CaCO3在聚氯乙烯(PVC)基体中的分散性,以及添加了改性纳米CaCO3的PVC复合材料的力学性能.结果表明,改性后纳米CaCO3的表面性质由疏油性变为亲油性;改性后纳米CaCO3在PVC基体中均匀分散,并且与PVC基体结合良好;添加改性纳米CaCO3的PVC的冲击强度和拉伸强度明显优于添加未改性纳米CaCO3的PVC.     

钛酸酯偶联剂改性纳米CaCO3/PVC的结构和性能

研究了钛酸酯偶联剂改性纳米CaCO3在PVC基体中的分散性,添加了改性纳米碳酸钙的PVC复合材料的力学性能。研究表明：改性后纳米CaCO3的表面性质由疏油变为亲油;改性后的纳米CaCO3在PVC基体中均匀分散,并且与PVC基体之间的结合良好。复合材料的力学性能测试表明：冲击强度得到很大的提高,当m(CaCO3)：m(PVC)=20：100时,材料的冲击强度为纯PVC的5倍多,而拉伸强度仅减小39／6。     

纳米CaCO3-PVC复合材料微观结构和力学性能研究

将纳米CaCO₃进行表面改性,制备了纳米CaCO₃-PVC复合材料。用透射电子显微镜观察纳米CaCO₃改性前后及纳米CaCO₃-PVC复合材料的微观结构。结果表明,表面改性后纳米CaCO₃在PVC基体中达到了纳米级的分散,对PVC复合材料有显著的增韧作用,复合材料的缺口冲击强度达到41.2kJ/m²。此外,还研究了纳米CaCO₃-PVC的流变性能。     

聚氯乙烯／超细碳酸钙的研究进展

本综述了近十年来，国内外碳酸钙填充聚氯乙稀(PVC)的研究进展。介绍了碳酸钙的表面处理，微米和蚋米级碳酸钙改性PVC的物理与力学性能。超细CaCO3对PVC有显的增韧效果，少量纳米CaCO3就可使PVC缺口冲击强度达到最大值，而且增韧效果比微米CaCO3的明显。随着蚋米级CaCO3用量增加，PVC拉伸强度提高。轻质CaCO3填充PVC的拉伸强度和断裂伸长率明显降低。轻质CaCO3仅起着填充或降低成本作用，而纳米CaCO3能有效地增韧增强。     

系列磷酸酯表面活性剂改性纳米碳酸钙及其在聚氯乙烯中的应用

研究了 9种磷酸酯表面活性剂对纳米CaCO3的表面改性 .改性CaCO3表面均由亲水变为亲油 ,从而显著地降低了CaCO3与邻苯二甲酸二辛酯 (DOP)糊的粘度 ,降低了CaCO3的吸油值 .改性后的CaCO3填充于软聚氯乙烯 (PVC)塑料 ,测定了塑料的加工性能和机械性能 .     

纳米碳酸钙的改性及在硬聚氯乙烯中的应用

用新型磷酸酯表面活性剂(ADDP)改性纳米碳酸钙(CaCO3),研究了CaCO3的吸油率、糊黏度、接触角等性质;研究了在CaCO3填充量不同时硬聚氯乙烯(PVC)的冲击强度、断裂伸长率、拉伸强度.结果表明:CaCO3改性后从亲水性变成亲油性;改性CaCO3填充的PVC塑料机械性能明显提高.     

新型钛酸酯偶联剂的应用研究

设计及合成了一类新型的钛酸酯偶联剂AEOT,用于改性超细CaCO3,系统研究了改性CaCO3的表面性能以及改性CaCO3/PVC复合体系的综合力学性能,并用扫描电子显微镜(SEM)对CaCO3/PVC复合材料的微观结构进行了分析,发现以分子量大的AEOT-15为改性剂对CaCO3进行表面活化处理,可显著改善CaCO3/PVC复合材料的综合力学性能.     

新型磷酸酯改性剂改性纳米碳酸钙及其在聚氯乙烯中的应用

研究了温度，溶液pH值，新型磷酸酯改性剂（ADDP）溶液浓度等因素对ADDP改性纳米CaCO3的影响，比较了改性纳米CaCO3和未改性纳米CaCO3的粒径分布，邻苯二甲酸二辛酯（DOP）中粘度及吸油量，并把改性纳米CaCO3应用于聚氯乙烯（PVC）中，测定了PVC／CaCO3软塑料的力学性能和加工性能。     

纳米碳酸钙增韧聚氯乙烯复合材料的微结构及界面行为

选择微米、亚微米和纳米级碳酸钙增韧聚氯乙烯复合材料,研究了填料粒度对聚氯乙烯（PVC）复合材料微观结构、材料力学性能及界面行为的影响。结果发现少量CaCO3填充PVC复合材料使体系的加工流动性变好,大粒径颗粒填充PVC复合材料的流动性能更好。纳米CaCO3／PVC复合材料断面出现大量的拉丝结构。采用纳米CaCO3填充PVC可使材料产生脆韧转变,显著提高PVC复合材料的韧性;微米CaCO3对PVC基本上没有增韧作用,拉伸强度随着填充量的增加而下降,而且粒径越大拉伸性能下降的趋势也越大。引入了TPT方程的半经验参数B对不同粒径的CaCO3填充PVC复合材料的界面粘接情况进行定量描述,发现碳酸钙颗粒粒径越小,界面作用越大。     

纳米聚丙烯酸酯微乳液改性纳米CaCO3研究

分别采用聚丙烯酸酯乳液和纳米级聚丙烯酸酯微乳液对纳米CaCO3进行改性,通过红外光谱分析、热重分析和扫描电镜分析研究改性纳米CaCO3的结构和性能.结果表明,改性后的纳米CaCO3由亲水疏油性变为亲油疏水性,纳米级聚丙烯酸酯微乳液与纳米CaCO3粒子表面发生了化学反应,并包覆到纳米CaCO3粒子表面.     

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.     

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。     

A computer generator for randomly layered structures

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

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.     

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.