一种二自由度并联摇摆台运动分析与仿真

根据“菲涅耳”光学助降装置发射光束的稳定性设计要求,提出采用一种二自由度并联驱动摇摆台来检验该装置随动系统的稳定性能。采用解析法建立了该试验台的运动方程,算例仿真分析结果表明:通过驱动主运动支链杆长的移动,可以实现既定规律下运动平台的横摇和纵摇运动,完全满足“菲涅耳”光学助降装置的性能测试要求。     

太阳能高倍聚光的方案优化及装置构建

通过分析和对比由菲涅耳透镜、曲面透镜、抛物碟式反射镜组合的聚光方案,得到了太阳能聚光的优化方案.基于理论分析发现,光学系统的效率依赖于光学部件及其结构设计,两级反射式系统能够比两级透射式拥有更高的光学效率.但在接收尺寸相同范围内,两级反射式需要更高的追踪精度,然而提高追踪精度势必增加聚光系统的复杂性和经济性.据此分析,构建了一套由菲涅耳透镜组成的两级透射式高倍太阳能聚光装置,并做了初步的对比性测试.     

菲涅尔双棱镜参数的综合测定

通过综合"菲涅尔双棱镜测量钠黄光波长"、"分光计"、"等厚干涉"等实验中的几何光学和干涉光学的方法实现了对菲涅尔双棱镜折射率n,楔角α的测量,并提出了一种非接触测量厚度的方法,即用统计方法间接测量了双棱镜的厚度h.另外此种方法指出了"菲涅尔双棱镜测量钠黄光波长"实验虚光源与狭缝位置的不同,对实验系统误差的修正有一定参考意义.     

关于菲涅耳圆孔衍射的分析讨论

本采用半波带法和菲涅耳近似求解法来比较分析了菲涅耳圆孔衍射，明确只有依据“波动”观点来处理问题，才会得出合符实际的、几何光学难以达到的正确结论。     

微波与光波分离聚焦集成透镜设计

设计了一种由光学菲涅耳透镜和微波螺旋结构透镜组成的集成透镜,微波透镜实现对入射微波能量的聚焦,光学菲涅耳透镜实现对入射可见光聚焦.由于微波螺旋结构对入射光没有阻挡作用,同时光学菲涅耳透镜对微波传输影响很小,且所提出的微波与光波分离聚焦集成透镜可以在将微波与光波分离汇聚于不同位置,微波焦点与光波焦点横向距离为35cm,并在微波焦点处电场强度增强5倍.故加载此集成透镜后可以在充分利用入射可见光的基础上,实现对微波信号的发射和接收.     

近场衍射中稳相点的菲涅耳衍射

用标量衍射理论分析了菲涅耳衍射的近似条件,对稳相点的菲涅耳衍射进行了计算,并讨论了稳相点菲涅耳衍射的物理图象.     

对一类菲涅耳公式的实验研究

菲涅耳公式用于描述不同折射率的介质之间的行为,是光学中的重要公式,用来解释反射光的强度、折射光的强度、相位与入射光的强度关系。为了解释实验中发现的光学现象,该文导出了光在介质分界面反射时的菲涅耳公式,通过实验的对比研究,在误差允许的范围内,由新公式得出的理论值与实验结果相符合,从而验证了这类菲涅耳公式的准确性。     

菲涅耳圆孔衍射的光量子理论

根据光的波粒二象性及量子力学路径积分的基本思想,建立了菲涅耳衍射的光量子路径积分形式。并首次对菲涅耳圆孔衍射问题给出了精确的定量描述,其结果与波动光学定性讨论规律相符,又与实验所得衍射花样一致.     

菲涅耳深区的散斑光强概率密度

利用基尔霍夫衍射理论分析了菲涅耳深区内的散斑场，得到了菲涅耳深区散斑光强的一般表达式．通过数值计算研究了菲涅耳深区的散斑光强分布，并由所得的光强数据统计计算了菲涅耳深区散斑光强概率密度，分析讨论了菲涅耳深区散斑光强概率密度随散射距离的演化规律．     

用菲涅耳波带片俘获两个Rayleigh粒子

提出了一个同时俘获两个Rayleigh粒子的光学俘获模型.用一束双环形拉盖尔高斯(LG10)径向偏振光入射到高数值孔径的亚波长菲涅耳波带片(SFZP)上,利用角谱理论计算波带片后的衍射场分布.结果显示,通过调节入射光的截断参数(β),在近场区和菲涅尔衍射区产生了两个绕光轴旋转对称的亮斑.两个亮斑均可以用来同时俘获Rayleigh粒子.最后讨论了俘获精度和俘获的稳定性.     

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.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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。     

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.