Ni80Fe20/Al2O3/Ni80Fe20隧道结的TMR特性

采用离子束溅射和磁控溅射技术制备了Ni80Fe20 Al2O3 Ni80Fe20磁性隧道结.控制样品上下铁磁层的厚度,研究了不同铁磁层厚度对样品隧道结磁电阻效应的影响.结果表明,磁电阻随着铁磁层的厚度变化而振荡.     

磁性隧道结电阻与电流驱动相关性分析

利用离子束高真空复合溅射装置置备具有Ta缓冲层和Ta/Te/Ta覆盖表面层的Fe/Al2O3/FeCo的磁性隧道结，在零磁场下观测隧道结电导和结电阻面积积（RA）与垂直射入隧道结平面的自旋极化发射电流的依赖关系，研究关系，研究发现，磁性隧道结的电导和RA的发射电流驱动效应取决于隧道结的物相成分，微结构和电流强度，在大驱动电流范围观测电到导特性不同的4个区域。     

Fe-Al_2O_3纳米颗粒膜的巨磁电阻效应及微结构

采用磁控溅射方法在玻璃基片上制备了一系列的 Fe- Al2 O3 颗粒膜样品 ,对样品的巨磁电阻效应 (GMR)和磁性能进行了测量 ,并用高分辨电镜 (HRTEM)对膜中 Fe颗粒的微结构进行观察 .结果表明 :磁电阻 MR随 Fe含量而变化 ,在体积分数为 47%时获得最大值 4.0 % .45 % Fe-Al2 O3 颗粒膜的室温磁性表现为超顺磁性 ,磁电阻 MR与 - (M/Ms) 2 成正比 ,相关常数 A≈ 0 .0 3 6 .HRTEM观察表明 ,当 Fe颗粒尺寸约小于 1 nm时 ,Fe颗粒为非晶态 ,而大于该尺寸时则为晶态 .在 Fe- Al2 O3 颗粒膜体系中存在与隧道相关的 GMR,GMR的起因可归于传输电子的自旋相关的散射     

Fe—Al2O3纳米颗粒膜的巨磁电阻效应及微结构

采用磁控溅射方法在玻璃基片上制备了一系的Fe-Al2O3颗粒膜样品,对样品的巨磁电阻效应（GMR）和磁性能进行了测量,并用高分辨电匀（HRTEM）对膜Fe枯粒的微结构进行观察,结果表明,磁电阻MR随Fe含量而变化,而体积分数为47％时获得最大值4．0％,45％Fe-Al2O3颗 膜的室温磁性表现为超顺磁性,磁电阻MR与－（M／Ms)2成正比,相关常数A约0．036,HRTEM观察表明,当Fe颗粒尺寸约小于1nm时,Fe颗粒为非晶态,而大于该尺寸时则为晶态,在Fe-Al2O3颗粒膜体系中存在与隧道相关的GMR,GMR的起因可归于传输电子的自旋相关的散射。     

隧道巨磁电阻效应的研究与应用

1974年,Slonczewski提出的铁磁金属／绝缘体／铁磁金属(FM／I／FM)结构中存在隧道巨磁电阻(TMR)效应,当两铁磁层磁化方向平行或反平行时,FM／I／FM隧道结将有不同的电阻值。很快,Julliere在Fe／Ge／Co隧道结中证实了这一点。这种因外磁场改变隧道结铁磁层的磁化状态而导致其电阻变化的现象,称为隧道磁电阻效应。随后,人们对一系列FM／I／FM磁隧道结的输运性质进行了研究。由于磁隧道结中两铁磁层间不存在或基本不存在层间耦合,     

Zn0.5Fe2.5O4-(α-Fe2O3)多晶隧道结磁致电阻材料合成与制备

以PVA为分散介质,通过低温固相反应合成了组成结构均匀的单相超微Zn0.5Fe2.5O4颗粒,然后经成型、高温气氛控制反应烧结成功制备得到具有Zn0.5Fe2.5O4-（α-Fe2O3）双相微结构的多晶隧道结磁致电阻材料.利用DAT/TG、IR、XRD、SEM和VSM-4探针磁电阻测定等技术,就超微Zn0.5Fe2.5O4颗粒的合成和Zn0.5Fe2.5O4-（α-Fe2O3）多晶隧道结磁致电阻材料的微结构特征及其磁致电阻效应进行了初步测定和分析讨论.研究发现,不同溶液动力学条件下合成粉体的粒径明显不同,且在烧结过程中一定氧分压的存在有利于绝缘层的形成.     

快淬纳米复合α-Fe/Pr2Fe14B薄带的硬磁性研究

通过熔体快淬法得到α Fe/Pr₂ Fe_{1 4} B纳米双相磁体, 研究了不同辊速快淬带的磁性能, 找到最佳直接快淬辊速条件, 并比较了直接快淬得到的样品和非晶薄带晶化后得到的样品的磁性能, 发现直接快淬得到的样品的矫顽力和机械性能优于非晶晶化样品。     

含磁性非磁性金属插入层磁隧道结的隧穿特性研究

讨论了一种新型FM1/NM/FM/I/FM2磁性隧道结,该隧道结结构可获得高质量的I层,从而具有重要的应用价值.利用Slonezewski的自由电子模型和转移矩阵方法,对这种隧道结中的隧穿电导(TC)和隧穿磁电阻(TMR)与NM、FM层的厚度以及和势垒高度的关系进行了研究.同时还通过和FM1/NM/I/FM2型隧道结的相应结果的比较讨论了FM层在FM1/NM/FM/I/FM2磁性隧道结中的作用.     

Fe/GaAs/Fe隧道结的磁电阻研究

用第一性原理的方法研究了Fe/GaAs/Fe隧道结的隧穿磁电阻(TMR).研究表明,TMR值对于界面的无序散射相当敏感,在考虑了界面无序的散射对电子输运的影响后,计算所得的TMR值与实验值吻合得很好.研究表明,界面无序的散射是造成TMR实验值很低的主要原因,而不是以往研究所认为的是界面处的自旋翻转的作用.     

退火方式对纳米FeCoPd/SiO_2复合薄膜结构和磁性的影响

采用溶胶—凝胶旋涂法,通过氢气还原及快速退火两种方式在Si(100)基片上获得纳米Fe Co Pd/Si O2复合薄膜,并对其进行了X射线衍射仪(XRD)和振动样品磁强计(VSM)表征分析,进一步研究不同退火方式对纳米Fe Co Pd/Si O2复合薄膜样品结构和磁性能的影响.结果表明,经过氢气还原处理后,薄膜中的Fe Co具有较强的(200)择优取向,且薄膜的矫顽力较小,表现出较好的软磁特性.     

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.