新型高强度铸造铝合金的热处理工艺研究

本论文采用正交实验,对新型高强度铸造铝合金的力学性能影响因子进行分析,确定出最佳的热处理工艺：固溶处理温度550℃,固溶处理时间16h,时效温度150℃,时效时间10h。在此工艺条件下铝合金具有优良的力学性能,抗拉强度σb可达到498MPa,延伸率δ为6．8％。     

新型高强Al-Mg-Si合金热处理工艺

结合力学性能测试、扫描电镜分析、DSC热差分析和金相组织观察,对一种新型高强Al-Mg-Si合金挤压材的固溶与时效制度进行了系统研究.同时得到了该合金挤压材不同时效温度下的力学性能,为工厂实际生产中热处理规程的制定以及深入研究提供详细的参考依据.该挤压材过烧温度572℃,熔化温度为594℃;对其进行560℃/2h固溶处理后,以及170℃/12 h人工时效热处理,可达到最佳峰值时效效果,其抗拉强度、屈服强度和延伸率可依次达到406,340 MPa和18.37%;该合金挤压材发生了充分的再结晶,致使加工硬化完全消除.     

半固态Al-Cu-Mn合金锻件的热处理工艺与组织

利用正交试验法,对Al-Cu-Mn合金半固态锻压件进行了固溶时效热处理.通过对硬度指标的分析,获得了热处理的最佳工艺参数.同时分析了时效后的显微组织.结果表明,Al-Cu-Mn合金半固态锻压件在固溶温度540℃、固溶时间13 h、时效温度165℃、时效时间8 h下,其维氏硬度值可达130 MPa以上;且析出相均匀、弥散地分布在基体上.     

高强耐磨形铝青铜的热处理工艺

采用正交试验方法优化了一种新型高强耐磨变形铝青铜合金的热处理工艺，并研究了时效温度和淬火介质对合金力学性能的影响。试验结果表明，合金的最佳热处理工艺参数为850℃保温1h，火淬，350℃时效1h，空冷。时效温度对合金性能有显著影响，在400℃以下，随时效温度的升高，合金的强度增大，而塑性无明显变化；在400℃以上，随时效温度的升高，合金的强度降低，而塑性显著增大。淬火介质的类型和温度影响合金的力学性能，常温水是理想的淬火固溶介质。     

高强耐磨变形铝青铜的热处理工艺

采用正交试验方法优化了一种新型高强耐磨变形铝青铜合金的热处理工艺 ,并研究了时效温度和淬火介质对合金力学性能的影响 .试验结果表明 ,合金的最佳热处理工艺参数为 85 0℃保温 1h ,水淬 ,35 0℃时效 1h ,空冷 .时效温度对合金性能有显著影响 ,在 4 0 0℃以下 ,随时效温度的升高 ,合金的强度增大 ,而塑性无明显变化 ;在 4 0 0℃以上 ,随时效温度的升高 ,合金的强度降低 ,而塑性显著增加 .淬火介质的类型和温度影响合金的力学性能 ,常温水是理想的淬火固溶介质     

改善锻铝合金强韧性的热处理工艺及机理研究

研究了改善１０号锻铝强韧性的热处理工艺,结果表明,合金经５００℃３００ｍｉｎ固溶淬火,１６７℃,６～１０ｈ时效工艺处理,达取最佳的强韧性效果,同时,对该合金的强韧化机理进行了探讨。     

高强度铝合金热处理工艺研究

高强度铝合金是多元Al－Si合金，本文在确定最佳成份及铸造工艺条件一定的情况下，研究了热处理工艺对机械性能影响的关系．对该合金经不同的固溶温度，不同的时效温度和时效时间进行了试验研究，结果表明：固溶后采用155±5°×6h时效工艺，合金可获得最佳的机械性能．     

高强耐磨铝青铜热处理工艺的研究

通过正交试验和对比试验优化了Cu14AlX铝青铜合金的硬化热处理工艺 ,找出了热处理过程中影响该合金硬化性能的 4种因素的主次顺序是 :固溶温度、时效时间、时效温度和固溶时间 .进一步研究证明通过 84 0～ 880℃油淬固溶和 5 70～ 6 0 0℃空冷时效处理 ,合金能够得到 4 8.2HRC的最高硬度 .硬化的原因是时效过程中共析相γ2 的均匀细化和κ相的弥散析出 .     

ＫＳ１２７５合金的时效过程研究

系统地研究了ＫＳ１２７５合金的热处理时效过程,总结出最佳热处理工艺是５２０℃固溶处理,２２０℃人工时效８h。     

消除7A05铝合金板材各向异性的热处理工艺

为提高7A05铝合金热轧板材的综合力学性能并减少各向异性,对7A05铝合金固溶、预时效、时效和形变处理等工艺对性能的影响进行了系统的研究. 比较了供货态、形变态、回归(RRA)态和采用预时效形变热处理的优化态热处理工艺对综合力学性能的影响. 结果表明:固溶的最佳温度为480 ℃,单级时效最佳工艺为120 ℃,24 h,双级时效中第一级时效最佳工艺为90 ℃,8 h,最佳形变为25%. 通过金相组织和力学性能测试结果表明:由于预时效析出促进形变热处理时亚晶等轴化,优化态强度高,进一步改善了合金性能,减少了轧制板材纵横向力学性能各向异性倾向.     

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.