无限长旋转圆柱体的广义热弹耦合问题

应用Lord和Shulman(L-S)广义热弹性理论,研究无限长旋转圆柱体的热弹耦合问题.建立L-S型广义的热弹耦合的控制方程,借助拉普拉斯积分变换及其数值反变换技术对问题进行求解,得到瞬态热冲击作用下无限长旋转圆柱体中的温度、应力、位移的分布规律.从其分布图上可以看出,介质中呈现出热的波动性和热弹耦合效应,由于旋转效应,位移、应力的幅值有明显提高,而旋转对温度几乎没有影响.     

两端固定有限长粘弹杆的广义磁热粘弹问题

应用Lord-Shulman(LS)和Green-Lindsay(GL)广义热弹性理论,研究了在磁场中受移动热源作用的两端同定有限长均质各向同性粘弹杆的磁热粘弹动态响应,并与经典耦合理论进行了对比.给出了杆的广义磁热粘弹耦合的控制方程,借助拉普拉斯积分变换及其数值反变换对控制方程进行了求解.计算得到了杆内无量纲温度、应力及位移的分布规律,从其分布图上可以看出时间、热源移动速度以及磁场大小对以上分布规律有一定的影响.     

半无限长旋转杆件中的广义电磁热弹耦合问题

应用Lord 和 Shulman(L-S)广义热弹性理论, 研究半无限长旋转理想杆件的电磁热弹耦合问题. 给出介质中的Maxwell方程组, 建立了L-S型广义电磁热弹耦合的控制方程, 借助拉普拉斯变换和数值反变换技术对问题进行求解, 得到瞬态热冲击作用下半无限长旋转杆件中的温度、 应力、 位移、 感应磁场和电场的分布规律. 结果表明, 介质呈现热的波动性和电磁热弹耦合效应, 由于考虑旋转, 对位移和应力提高较大, 但对杆的感应磁场和电场的影响较小, 对温度基本没有影响.      

受热冲击时球体的广义热弹性分析

基于具有2个热松弛时间的G-L广义热弹性理论,研究了实心球体外表面突然受到均匀热冲击时的广义热弹性问题.由于控制方程复杂,到目前为止此类问题的解析解还没有得到.文中利用拉普拉斯正、反变换技术和热冲击的瞬时特征对该问题进行求解,最终得到了位移场和温度场的渐近表达式;通过数值计算,获得了热冲击下实心球体的位移与温度分布规律,以及热松弛时间和耦合系数对位移及温度分布的影响.结果表明:位移及温度分布中存在2个阶跃点;热松弛时间和耦合系数对位移及温度的阶跃时间、阶跃间隔和阶跃峰值均产生影响,对热冲击的作用效果也有一定的抑制作用.     

热冲击下理想黏结三明治板的分数阶广义热弹性问题分析

为了研究对称热冲击作用下三明治板的广义热弹动态响应,假定三明治板连接界面处为零阻抗理想黏结,材料特性参数随温度变化,采用分数阶广义热弹性理论,给出了层合板广义热弹耦合的控制方程.基于拉普拉斯变换及其数值反变换对控制方程进行求解,得到了无量纲温度、位移及应力的数值解.重点讨论了热传导系数、密度和比热容等材料参数在界面处的变化对热传递及结构响应的影响,同时考虑了分数阶参数及温度相关性参数的影响效应.计算结果表明,温度、位移和应力随界面处材料热传导系数、密度和比热容的减小而增加;分数阶参数对温度和应力的影响较大,对位移影响较小;温度、位移和应力的幅值随温度相关性参数的增大而减小.界面处材料热传导系数、密度和比热容的减小促进热沿板厚方向的传导,分数阶理论和材料的温度相关性对温度、位移和应力的分布影响显著.     

双温度广义热弹问题的一维动态响应

基于双温度广义热弹性理论,研究了有限长杆的热弹动态响应问题.杆两端固定,受移动热源作用.给出了双温度广义热弹性理论下问题的控制方程,并借助拉普拉斯积分变换及其数值反变换对控制方程进行求解.经计算,得到了杆内无量纲应力、位移、传导温度、热力学温度随时间和移动热源速度的变化规律.结果表明,杆中的无量纲应力、位移、传导温度、热力学温度随热源速度的增大而减小.     

分数阶热弹性理论下的广义电磁热弹问题

基于分数阶热弹性理论,就无限长圆柱导体的广义电磁热弹耦合问题的动态响应开展研究.圆柱体置于恒定的外加磁场中,在其表面处受到热冲击作用.给出分数阶理论下问题的控制方程,并运用拉普拉斯变换及其数值反变换技术对控制方程进行求解,得到圆柱体中无量纲温度、位移、应力、感应电磁场的分布规律并用图形进行反映.计算中,重点考查时间和分数阶参数对各物理量变化规律的影响效应.结果表明:分数阶参数对于位移和感应电场的变化有显著的影响,而对于温度、应力和感应磁场的影响不大.     

特性参数与温度相关的非局部广义热弹问题的动态响应

基于Green-Lindsay广义热弹性理论和Eringen的非局部弹性理论,研究了材料特性参数与温度相关、受热冲击和应力冲击作用的半无限大体的一维非局部热弹动态响应问题.借助于拉普拉斯积分变换及其数值反变换,经数值求解,得到了无量纲温度、位移、应力的分布规律,并用图形进行表示.分别研究了温度相关的材料特性参数、分数阶参数及非局部效应参数对温度、位移和应力的影响效应,结果表明:温度相关的材料特性参数对各物理量的影响显著;分数阶系数对温度影响较大,对位移和应力影响不大;非局部效应参数对位移和应力有显著影响,对温度影响较小.     

分数阶热弹理论下重力对压电介质中波传播的影响

基于分数阶热弹理论,研究了半空间无限大压电介质受周期载荷作用时重力对波传播影响.给出分数阶广义热弹性理论下的控制方程,运用正则模态法对控制方程进行求解,得到了半空间无限大压电介质中的无量纲温度、位移、应力和电位移等物理量的分布规律.重点研究了分数阶参数及重力对各物理量的影响效应.结果表明:半空间无限大压电介质中由于周期...     

广义电磁热弹二维问题的正则模态法

应用带有两个热松弛时间的G-L广义热弹性理论,研究-理想导体的半无限大电磁介质的电磁热弹耦合的二维问题．给出介质中的Maxwell方程组,建立了电磁热弹祸合的控制方程,通过正则模态法得到温度、位移、应力等物理量的解,并用图形反映了各物理量的分布,由此可以看出,热在介质中是以有限速度传播．     

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.     

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.     

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。     

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.     

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.