C／ZnAl—22锌基复合材料阻尼性能

研究C／ZnAl-22短碳纤维锌基复合材料，随纤维加入量及环境温度变化与阻尼性能之间的关系，发现碳纤维加入量为24％Vf时，其阻尼性能是ZnAl-22合金的2．4倍并且随环境温度的升高，阻尼性能提高。     

碳纤维复合材料对高尔夫球杆阻尼性能的影响因素

采用实验室自制的双组分聚氨酯基体树脂与T700碳纤维共聚制备了一系列聚氨酯基碳纤维复合材料薄板,并对其进行了静态和动态热力学性能测试。结果表明:当形变量小于0.5%及形变速率小于0.4%/s时,材料的阻尼性能不发生明显变化;碳纤维取向角度对阻尼性能有明显影响,随取向角度增大,阻尼性能下降。将实验测试结果与理论模型计算结果对比,发现两者基本吻合,为采用聚氨酯基碳纤维复合材料制备高尔夫球杆的计算提供数据参考。     

温度变化对呋喃树脂砂固化剂加入量的影响

通过试验探讨了呋喃树脂砂中固化剂随温度变化的规律 ,得出固化剂的加入量随砂温和环境温度变化的关系式 .可通过测得砂温和环境温度值来确定合适的固化剂加入量 ,以满足各种铸钢件所需要的树脂砂终强度 .     

碳纤维钢渣混凝土强度及导电性能研究

将碳纤维和钢渣复相导电组分加入到水泥基中制备成导电混凝土,不仅能起到增强的作用,而且还具有良好的导电性能.通过试验的方法,探讨了碳纤维含量不同的两组混凝土随钢渣掺量对抗压强度和电阻率的影响.试验结果表明:在碳纤维混凝土中加入一定量的钢渣,不仅能有效增加混凝土的抗压强度,而且能够改善纤维混凝土的导电性能.在不影响混凝土导电性能的条件下,通过掺加钢渣降低碳纤维的使用量,节约导电混凝土的材料成本.     

用Wigner函数理论研究介观串并联RLC电路的量子涨落

考虑阻尼和温度影响,将介观串并联RLC电路等效成量子化阻尼谐振子,利用Wigner函数和热场动力学理论研究了热真空态、真空态下电流和电压的量子涨落.结果表明,支路电流电压的量子涨落不仅与电路器件的参数有关,而且和环境温度有关.且由于电流焦耳热、环境温度和阻尼电阻的影响,涨落随环境温度升高而增大,随时间而衰减.     

锌铝双氢氧化物对膨胀阻燃聚丙烯热稳定性能与阻燃性能影响的研究(英文)

采用一步法制备十二烷基硫酸钠改性的锌铝双氢氧化物(ZnAl(SDS)-LDH),并对其结构进行表征,然后通过熔融共混法制备膨胀阻燃聚丙烯/ZnAl(SDS)-LDH复合材料,系统研究了ZnAl(SDS)-LDH的添加量对膨胀阻燃聚丙烯复合材料阻燃性能和热稳定性能的影响,同时研究复合材料制备方法对材料结构和性能的影响.研究表明,体系的阻燃效率不仅与ZnAl(SDS)-LDH的添加量有关,与材料的制备工艺也有很大关系.添加适量的ZnAl(SDS)-LDH可明显提高膨胀阻燃聚丙烯材料阻燃性能和热稳定性能.在ZnAl(SDS)-LDH添加量相同的情况下,先加ZnAl(SDS)-LDH,后加膨胀阻燃剂的样品的阻燃性能明显优于先加膨胀型阻燃剂,后加ZnAl(SDS)-LDH的样品.     

化学改性发泡剂对泡沫铝材料性能的影响

采用熔体发泡法,利用化学镀镍改性的TiH₂作为发泡剂制备了泡沫铝,分析了改性TiH₂发泡剂的热分解行为,研究了改性TiH₂发泡剂加入量对泡沫铝材料孔隙率、压缩性能和阻尼性能的影响.结果表明,改性TiH₂发泡剂有效提高了释氢反应的开始温度,将释氢反应开始温度从480℃提升至550℃,并降低了释氢速率;随着改性发泡剂添加量的增加,泡沫铝的孔隙率增大,压缩强度变小,阻尼性能呈现先增大后减小的变化趋势;当加入质量分数1.5%的改性发泡剂时,泡沫铝的孔隙率达88%,孔洞分布及尺寸相对均匀,压缩强度、阻尼性能等综合性能良好.     

Zn含量对Mg-0.6Zr合金力学性能及阻尼性能的影响

采用金相分析、拉伸试验、动态机械热分析等方法研究了不同含量Zn对Mg-0.6Zr合金力学性能及阻尼性能的影响.结果表明,加入微量Zn后,Mg-0.6Zr合金的强度和伸长率都得到提高,且强度随Zn含量的增加而增大,而伸长率而随Zn含量的增加变化不大;阻尼性能有所降低,且随Zn含量的增加而降低,这是由晶粒细化和溶质原子增多所导致的结果.     

Ba4.5La9(Ti1-ySny)18O54微波介质陶瓷的制备与表征

采用传统固相烧结工艺,制备了Ba4.5La9(Ti1-ySny)18O54陶瓷.研究了不同SnO2添加量对烧结体性能、晶相组成以及晶粒形貌的影响.结果表明:加入SnO2后,烧结体均能在1300～1450℃内烧结致密,随SnO2加入量的增多,烧结体介电常数线性下降,品质因数(Q·f)提高;在SnO2加入量为0.1mol时,获得较优性能,εr＝106.74,Q·f＝2354.22GHz(测试频率为2～4GHz);烧结体的主晶相为类钙钛矿型钨青铜结构固溶体,不随SnO2添加量变化.扫描电镜(SEM)分析表明,SnO2的加入能够抑制晶粒的生长,当加入量为0.1mol时,生成了少量富Sn方形颗粒,柱状晶粒尺寸显著减小.     

CeCl3对H13钢固体粉末法硼钒共渗的影响

研究了CeCl3对固体粉末法硼钒共渗渗层成分、组织和性能的影响 .发现随CeCl3加入量的增加 ,渗层中新相Al2 O3的量不断增多 ;当CeCl3加入量为 5%时 ,渗层中出现连续致密分布的Al2 O3黑区组织 .对此进行了性能测试和机理探讨 .     

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.