抗坏血酸在钼蓝法测定微量SiO2中的应用

研究了以抗坏血酸为还原剂，用光度法测定碳化硅超细粉中微量ＳｉＯ２的方法，结果表明，最大吸收波长为８００ｎｍ，表观摩尔吸光系数为２．５０＊１０＾４Ｌ／（ｍｏｌ．ｃｍ），线性范围为０．０５－０．０７ｍｇ／Ｌ，平均回收率为９９．３２％，ＲＳＤ为１．６７％，该法适用于碳化硅超细粉中微量ＳｉＯ２的测定。     

高纯超细氧化铝粉制备方法的对比研究

以不同原料，分别对制备高纯超细氧化铝粉的静态热分解法及喷雾热分解法进行对比研究，对影响粉体质量的诸因素作了具体分析与对比。获得纯度大于９９．９８％，细度为０．１６～０．２μｍ的α－Ａｌ２Ｏ３超细粉。     

异丁醇的内扩散对—0.6级速度方程的影响

在Ｐｔ／ａＬ２ｏ３催化剂上，用外循环无梯度反应器研究了异丁醇内扩散对异丁醇完全氧化动力学的影响。用０．４５￣０．６０ｍｍ催化剂，反应在动力学区域进行，异丁醇完全氧化的动力学用－０．６级速度方程描述。当催化剂颗粒增大到４ｍｍ时，反应受内扩散控制，在内扩散区域异丁醇反应级数变为－０．０１级。测定了催化剂有效因子η，其值在０．２１￣０．６１之间。它表明孔扩散阻力严重。在温度恒定时，ηｅｘｐ值随异丁醇分压     

异丁醇的内扩散对－0．6级速度方程的影响

在Ｐｔ／Ａｌ２Ｏ３催化剂上，用外循环无梯度反应器研究了异丁醇内扩散对异丁醇完全氧化动力学的影响。用０．４５～０．６０ｍｍ催化剂，反应在动力学区域进行，异丁醇完全氧化的动力学用－０．６级速度方程描述。当催化剂颗粒增大到４ｍｍ时，反应受内扩散控制，在内扩散区域异丁醇反应级数变为－０．０１级。测定了催化剂有效因子η，其值在０．２１～０．６１之间。它表明孔扩散阻力严重。在温度恒定时，ηｅｘｐ值随异丁醇分压的升高而增加。在异丁醇分压固定时，ηｅｘｐ值随反应温度升高而下降。反应在动力学区域时，异丁醇完全氧化的活化能为２６．０ｋＪ／ｍｏｌ，而在内扩散区域时，反应活化能为２３．７ｋＪ／ｍｏｌ。     

Co－Sn替代钡铁氧体的制备及其磁性

用化学共沉淀工艺制备了可望用作高密度垂直磁记录介质的Ｃｏ－Ｓｎ替代钡铁氧体系列微软样品ＢａＦｅ＿（１２－２ｘ）Ｃｏ＿ｘＳｎ＿ｘＯ＿（１９），其中ｘ可取值为０，０．２，０．４，０．５，０．６，０．８，１．２．给出了最佳制备条件：反应温度ｔ＝８０℃，体系的ｐＨ值ｐＨ＝１１．８，热处理温度Ｔ＿ｈ＝９２５℃。对所制备的系列样品进行了透射电镜（ＴＥＭ）观测和ｘ光衍射（ＸＲＤ）测试，给出了颗粒的形貌和大小以及晶体结构和晶格常数。用振动样品磁强计（ＶＳＭ）对宏观磁性进行了测试，给出了宏观磁性与替代浓度关系。     

La1—xAgxMnO3多晶非均匀匀颗粒系统的巨磁电阻效应

采用固相烧结法制备了名义成分为Ｌａ１－ｘＡｇｘＭｎＯ３（０≤ｘ≤０．５０）的大块多晶样品，并且首次研究了它们的巨磁电阻效应，分析表明：当ｘ≤０．２５时，样品基本上由单一的钙钛矿结构相组成；当ｘ〉０．２５时样品明显由两相组成，钙矿结构相和富Ａｇ合金相，它们组成了一个非均匀的颗粒系统，在ｘ＝０．３０时，具有高达２５．５％的巨磁电阻效应，非均匀颗粒系统呈现的磁电阻效应与电子在两相颗粒界面的自旋相关散射有     

磷渣超细粉混凝土的流动性、抗压强度与耐久性研究(英文)

磷渣超细粉的比表面积大于６０００ｃｍ２／ｇ,它和矿渣细粉一样都是玻璃态物质。通过对磷渣超细粉和矿渣细粉的比较研究发现,磷渣超细粉取代部分水泥后可以改善混凝土的流动性、强度和耐久性。按磷渣超细粉２７５ｋｇ／ｍ３、普通硅酸盐水泥２７５ｋｇ／ｍ３、水胶比０．２６、超塑比剂９．７ｋｇ／ｍ３配制的混凝土坍落度为２４０ｍｍ,２８ｄ抗压强度为１０１ＭＰａ,氯离子扩散系数较普通水泥混凝土降低１／３。     

用颗粒相双尺度二阶矩湍流模型模拟突扩两相流动

基于将颗粒脉动分成湍流引起的大尺度脉动和颗粒间碰撞产生的小尺度脉动的概念，应用单相流动多尺度湍流模型方法，从双流体模型出发，推导和封闭了颗粒的双尺度脉动雷诺应力方程、大尺度脉动能量传递率方程、小尺度脉动耗散率方程和两相脉动关联方程，用统一的湍流模型方法构造了包含颗粒两类脉动的新的颗粒双尺度二阶矩两相湍流模型．用该模型对突扩管内的两相流动进行了数值模拟，并和单尺度的二阶矩两相湍流模型进行了比较，计算结果和实验数据吻合较好，比单尺度的二阶矩两相湍流模型的计算结果有所改进．     

珍珠超细粉体的制备及物性研究

以珍珠为研究对象 ,用高频振动磨进行干式超细粉碎 ,简要介绍了珍珠超细粉体的制备过程和特点 ,考察了超细粉碎过程中珍珠粉体的色泽变化 .采用激光衍射法分析了粉体颗粒的粒度、粒度分布及比表面积的变化特征 .结果表明 ,可获得 5～ 10 μm的珍珠超细粉体 ,细度达到了所需要求 ,且色泽好、品质高、无污染 ,是一种制备珍珠超细粉体的有效、可行的方法 .     

溶液聚合法合成热固性丙烯酸粉末涂料用树脂

用溶液聚合方法合成含羟基热固性丙烯粉末涂料用树脂。单体配比为：“硬“组分６０ｗｔ％～８０ｗｔ％、“软“组分１０ｗｔ％～２０ｗｔ％、交联组分１０ｗｔ％～２０ｗｔ％，溶剂是丁酮和甲苯的混合溶剂，单体对溶剂的重量比０．６７～１．０：１．０。引发剂ＡＩＢＮ的用量是单体重的１．５％～４．０％。在回流温度下，反应３ｈ，制得符合制造粉末涂料要求的树脂。     

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.     

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.     

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.