光折变稳态简并四波混频精确理论

通过变量代换对光折变介质中的稳态简并四波混频过程作了理论分析,对透射光栅耦合波方程组作了精确求解,指出了四波混频中有关参量之间的关系和特性。     

有局域场的三能级∧系统的瞬态解析结果

考虑Lorentz局域场效应的影响，我们在Liouville运动方程的基础上用微扰理论分析了一个三能级系统的非线性响应．在非线性光学响应中，两波矢分别为k1，k2的连续相干脉冲将会在新的方向产生新的光波．计算之后，我们给出四波混频信号关于Lorentz局域场因子l的表达式，发现负时间延迟时在2k2-k1方向仍有四波混频信号，四波混频信号的频率也有所改变．     

DWDM系统矩形脉冲波四波混频影响的分析

以DWDM系统的中心信道为例,综合考虑到信道间的脉冲走离效应、信号比特模式及各信道初始相位的随机性,以及多个四波混频项对同一信道的影响,研究了四波混频效应对矩形脉冲波DWDM系统性能的影响.四波混频效应在考虑到各种随机因素的条件下,表现为信道的噪声.实例计算表明,信道间隔、各信道的峰值功率、脉冲波的占空比以及传输光纤的群速度色散系数都是影响四波混频噪声对系统性能影响程度的重要因素,当占空比和信道间隔有相对较大的值时,四波混频噪声对系统性能影响程度的量化值随着群速度色散系数的变化呈现出更明显的多个极小值结构,这对合理设置群速度色散系数兼顾四波混频噪声和符号间干扰两种重要影响因素有着重要意义.     

双光束抽运的受激布里渊散射反射率的实验研究

把一台YAG激光器输出的激光分成两束,同时入射到布里渊散射池中,获得在不同条件下双光束抽运的受激布里渊散射的反射率随抽运能量的变化关系.实验结果显示,两束抽运光在产生受激布里渊散射过程中存在耦合并且相互增强.用四波混频过程对实验结果进行了讨论.     

双模光纤中参量FWM对Stokes光子的抑制

通过对双模光纤的传输方程进行数值求解，从理论上验证了在不考虑群速度失配的情况下，在光纤两个模式上相互作用的非线性色散光波之间，存在着由相交相位调制（ＣＰＭ）所引起的调制不稳定（ＭＩ），由理论输出谱线进行分析得出，ＭＩ效应产生的参量四波混频（ＦＷＭ）效应的参量Ｓｔｏｋｅｓ边带和反Ｓｔｏｋｅｓ边带将对普通的受激喇曼散射（ＳＲＳ）产生明显的抑制，并讨论了输入光功率对此抑制效应的影响。     

共振吸收介质中含时间的非简并四波混频理论

本文理论分析了在共振吸收介质中光波电场(振幅)与时间有关的非简并四波混频,得到了耦合波方程的精确解。发现在介质中,信号光和探测光的光波电场不仅是时间的函数,而且其空间分布也发生了变化,进而得到反射率R和透射率T以及参量过程的转换系数(?)。     

皮秒激光在充气毛细管中四波混频的理论描述

建立了描写皮秒激光在充气毛细管中四波混频过程的耦合方程组．利用这个耦合方程组对最近的毛细管中差频过程的实验结果给出了新的理论说明．发现采用三阶非线性极化率大的介质是进一步提高信号光强度的重要途径．     

氩气的匹配对钠原子近4D能级双光子共振参量四波混？…

对３３０ｎｍ信号分析表明，当钠原子饱和蒸气压为２６６Ｐａ，配以氩气压强１５００Ｐａ时，参量四波混频过程最强。     

巴鲁那-维林金黑洞的单圈量子修正

从相互耦合的四维引力、单极子作用量和四维无质量标量场作用量出发,利用球对称退化的两维伸缩子理论,通过微扰方法获得了量子修正的Barriola-Vilenkin黑洞解.发现黑洞熵的量子修正要写成klnAh的形式,其中Ak是黑洞的视界面积,而常数k则依赖于量子化方法.     

四角场S=2离子ZFS高阶微扰公式的收敛性

本文以~５Ｂ＿２为基态，在强场图象下用微扰理论推导出了轴向零场分裂参量Ｄ的１到４阶微扰计算公式（~５Ｄ近似），并就公式的微扰收敛性进行了系统的讨论．通过计算和分析表明，当第一激发态靠近基态使得其能量与旋轨耦合常数ζ可比拟时．微扰公式是发散的．这时，微扰近似方法将不再有效。但在大多数情况下，公式保持有较好的收敛性．同时，给出了使微扰松式有效的晶场参量Ｄ＿９、δ和μ的近似取值范围，为~５Ｄ近似公式的应用提供了有价值的参考。     

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.