超细粉末材料改性水玻璃粘结剂

从几种可能的超细材料里面筛选出一种最合适的超细材料,就这种材料对水玻璃粘结剂的具体性能影响展开研究.结果表明:用经过特殊处理后的超细粉末材料改性水玻璃粘结剂,具有常温强度高、残留强度低等优点;超细粉末材料改性的水玻璃粘结剂采用酯硬化工艺,可使水玻璃粘结剂的加入量低于3.0%,在水玻璃砂常温强度有所提高的前提下,其溃散性显著改善.较佳的超细粉末材料改性水玻璃粘结剂的测试结果为(与不改性水玻璃相比):常温24h强度提高了30.7%,残留强度下降了40.1%.     

钾钠系水玻璃砂性能的研究

对钾钠系水玻璃砂的性能进行了全面研究,阐述了水玻璃性能、CO_2硬化工艺及附加物对硬化强度、残留强度的影响规律,探讨了钾钠系水玻璃砂残留强度的变化机理,并叙述了改性钾钠系水玻璃砂的各种工艺性能。试验表明:该种水玻璃砂的低温和高温残强都很低,溃散性明显好于普通水玻璃砂,其它工艺性能与普通水玻璃砂相近,钾钠系水玻璃是一种良好的改性水玻璃粘结剂。     

新型改性水玻璃性能的研究

本文采用无机—有机物组合这一新思路,对水玻璃进行改性处理,研制出了TN_5、TN_2两种新型改性水玻璃。分别讨论了改性剂磷酸盐、有机物T对水玻璃性能的影响,测定了新型水玻璃的主要性能,并进行了少量浇注试验。结果表明,TN_5、TN_2改性水玻璃的吹CO_2硬化强度高于普遍水玻璃,其溃散性明显优于普通水玻璃;与著名产品英国Foseco.公司的Solosil433改性水玻璃的综合性能相近;是较为理想的新型铸造粘结剂,可望应用于实际铸造生产。     

粘结剂添加量对粘接效率的影响

本文结合应用树脂砂、水玻璃砂等化学粘结剂砂的实践,从理论上分析了粘结剂添加量对粘接效率影响的规律。     

水玻璃旧砂的力学性能及其可再生性

提出了通过计算水玻璃旧砂残留枯结剂膜的弹性模量/屈服压应力的比值大小来衡量水玻璃旧砂的可再生性的准则,即比值越大,旧砂的可再生性越好,通过试验测试了不同处理温度下水玻璃砂样的屈服压应力和弹性模量,用来反映水玻璃旧砂残留粘结剂膜的力学性能.试验结果表明:加热条件下,受热温度为320～520℃时,水玻璃砂样的弹性模量/屈服压应力的比值较大,"加热-机械"再生效果较佳;冰冻温度为0～-40℃时,水玻璃旧砂的冰冻温度越低越有利于再生,且水玻璃砂样中的含水量对水玻璃砂样的弹性模量/屈服压应力的比值影响较大,当含水量为5%～15%时,"冰冻-机械"再生效果较好.     

超声改性水玻璃及水玻璃型（芯）砂性能的改善

采用超声振动对水玻璃进行改性，研究了超声波处理时间对水玻璃砂性能的影响；同时还研究了超声改性时间一定，水玻璃加入量及加入附加物对水玻璃砂性能的影响。结果表明，超声改性可有效改善水玻璃砂的湿强度、干强度，且能使水玻璃的加入量由８％降至４％，显著改善其溃散性能。     

型砂对铸钢件热裂的影响

本文通过分析型砂热物理性能和高温力学性能与铸钢件热裂的关系,研究了型砂对铸钢件热裂的作用规律,进而比较了几种常用型砂对热裂的影响,得出铸件易热裂规律为:原砂相同时,呋喃树脂砂>水玻璃砂,粘结剂相同时,石英砂>铬铁矿砂>锆砂;原砂、粘结剂都不相同时,呋喃树脂砂>水玻璃砂。     

细化凝胶胶粒对水玻璃的改性作用

分析了酯法比ＣＯ２法水玻璃砂强度高的原因，指出充分发挥水玻璃粘结效率的关键在于细化水玻璃凝胶胶粒。据此，选用能阻抑胶粒长大的化合物对水玻璃进行改性，有效地提高了水玻璃砂的粘结强度。透度电镜观察证实，改性水玻璃比普通水玻璃的凝胶胶粒细小。     

表面活性剂对水玻璃砂性能影响研究

为了比较表面活性剂和化学改性剂对水玻璃的改性效果,使用了表面活性剂十二烷基磺酸钠和化学改性剂聚丙烯酰胺对水玻璃进行改性。实验结果表明：水玻璃的粘度随表面活性剂和化学改性剂的加入量而减小。当表面活性剂加入量为0.6%时,水玻璃砂的抗压强度最高,跟化学改性剂相比,表面活性剂的改性效果有所提高。当改性水玻璃加入量为4%时,在低吹气时间时十二烷基磺酸钠对水玻璃砂溃散强度的改善优于聚丙烯酰胺,而在高吹气时间时,聚丙烯酰胺对水玻璃砂溃散强度的改善优于十二烷基磺酸钠。     

表面活性剂对水玻璃砂性能的影响

为比较表面活性剂和化学改性剂对水玻璃的改性效果,使用了表面活性剂十二烷基磺酸钠和化学改性剂聚丙烯酰胺对水玻璃进行改性.实验结果表明,水玻璃的黏度随表面活性剂和化学改性剂的加入量增加而减小.当表面活性剂加入量为0.6%(质量分数)时,水玻璃砂的抗压强度最高,与化学改性剂相比,表面活性剂的改性效果有所提高.当改性水玻璃加入量为4%(质量分数)时,在吹气时间短时十二烷基磺酸钠对水玻璃砂溃散强度的改善效果优于聚丙烯酰胺,而在吹气时间长时,聚丙烯酰胺对水玻璃砂溃散强度的改善效果优于十二烷基磺酸钠.     

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.