正弦电源驱动下氯化氪准分子灯的特性研究

介绍了基于介质阻挡放电的氯化氪(KrCl*)准分子灯的光谱、输入功率以及222 nm的辐射效率.KrCl*准分子灯为同轴结构,内管和外管的内/外径分别为14/16,37.6/40 mm.灯内总气压为200 hPa,其中含2 hPa氯气和198 hPa氪气.KrCl*准分子灯由正弦电源驱动.测定辐照度后,通过Keitz公式计算222 nm的辐射功率,而灯的功率则通过示波器结合高压探头和电流互感器来测量.结果表明,KrCl*准分子灯在正弦电源频率48.4 kHz,输入功率150 W时222 nm辐射的最佳效率为5.3%.     

宽带准分子激光器的调谐特性

宽带可调谐准分子激光源,是电子束泵浦的双原子和三原子稀有气体卤化物通过束缚-自由跃迁产生的.最近,已在XeF(C→A)、Xe_2Cl和Kr_2F三种激活介质的准分子激光器中观察到了激光作用.本文在介绍了它的发展情况之后,着重介绍了纵向电子束泵浦的XeF(C→A)准分子激光器.利用这种激光器可获得从455毫微米到529毫微米的宽带可调谐范围,以及1毫微米的频谱线宽.最后,本文还报道了Xe_2Cl激光器的实验情况.     

准分子激光在医疗中大显身手

准分子激光在医疗中之所以得到广泛应用,就在于它和生物组织作用的独特机理——光化学分解作用,从而解决了许多临床治疗的难题。准分子激光是一种波长短、峰值率高的紫外线激光,由于其损伤小,人们又称它为“冷激光”。医学上应用的准分子激光主要有XeCl,308nm;Arf,193mm;KrF,248nm。而最常用的准分子激光源是XeCl激光,有机物体     

氙准分子光源的实验研究

氙准分子光源发射波长为172nm真空紫外光谱带,实验研究了它的辐射特性,用原子,分子碰撞辐射动态模型（CRAM）的结果,分析了氙准分子172nm辐射强度与所加电场大小,频率和输入功率的关系,实验和理论结果相符。     

主流CPU的历史发展与趋势分析

通过理论联系实际,了解计算机CPU产品的历史和发展过程.是一次详细地介绍计算机的核心部件,其中更详细地介绍市场上主流型号以及其技术的发展趋势.     

主流CPU的历史发展与趋势分析

通过理论联系实际,了解计算机CPU产品的历史和发展过程.是一次详细地介绍计算机的核心部件,其中更详细地介绍市场上主流型号以及其技术的发展趋势.     

解空间搜索中的B*树算法

本文给出了在人工智能求解中的一种算法——B*树算法。文章比较了B*树算法与A*树算法、BB算法的不同处和特点,较详细地叙述了在两种决策策略下B*树返回修正值的产生过程,并用算法语言对B*树算法作了具体描述。     

准分子激光光刻AZ1350SF正胶的实验研究

80年代,准分子激光一出现,世界上各先进国家就开展了准分子激光光刻的研究工作。目前,美、日等国准分子激光光刻水平已低于0.4μm的分辨率。他们研究中采用准分子激光多为KrF和XeCl激光,光致抗蚀剂有MP2400,PMMA,PMGI和NOVOLAK等,XeCl激光暴光时采用的是重氮型光刻胶AZ2400。我们采用XeCl准分子激光(波长为308nm)对美国正胶AZ1350SF进行光刻研究,研究中获得一些重要实验结果。     

A*算法的探讨及其对八数码问题的实现

对人工智能中的经典启发式搜索算法进行了比较详细的介绍,在启发式搜索算法缮进行了解释,并在其旨在提高搜索效率的方面作了比较详尽的介绍,详细的描述了启发式A 搜索算法,并以八数码问题为例,用A*算法的C语言程序解决了八数码问题,取得了预期的搜索解,提高了搜索效率.     

利用Spatial处理空间数据

主要解释Oracle Spatial的核心概念,尤其是它在存储和分析空间数据方面的作用.首先介绍了数据模型的概念,然后通过实例解释了如何把一个复杂的空间图形输入到数据库中,最后对如何高效地查询指定内容进行了详细的描述.     

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.