热处理对TiO2光催化活性的影响

研究了热处理对ＴｉＯ２粉末光催化活性的影响,结果表明,加热温度和加热时间是影响ＴｉＯ２光催化活性最主要的因素,样品由非晶向锐钛矿型转变的温度为４２９℃;当６００℃热处理５ｈ,锐钛矿型与金红石型的比例为８３／１７时,ＴｉＯ２的光催化活性最高。     

纳米二氧化钛光催化剂形态和活性的研究

应用微乳液反应法合成水合 Ｔｉ Ｏ２ ,经煅烧获得纳米 Ｔｉ Ｏ２ 粒子．采用 Ｔ Ｅ Ｍ 、 Ｘ Ｒ Ｄ、 Ｂ Ｅ Ｔ 比表面积测试等手段对粒子进行表征．结果表明,经６５０ ℃煅烧后粒子为锐钛矿型,平均晶粒尺寸为２４．６ ｎｍ ,比表面积为５３．８ ｍ ２ ／ｇ,经１０００ ℃煅烧后粒子为金红石型,平均晶粒尺寸为５３．５ ｎｍ ,比表面积为２０．３ ｍ ２ ／ｇ．考察 Ｔｉ Ｏ２ 粒子晶型对光催化降解苯酚溶液活性的影响,结果表明锐钛矿型纳米 Ｔｉ Ｏ２ 光催化活性最高     

高温气溶胶反应器中制备纳米TiO2颗粒的形态和结构

在高温管式气溶胶反应中,利用ＴｉＣｌ４,气相氧化制备纳米ＴｉＯ２颗粒,研究了ＴｉＯ２颗粒的形态和结构特征,实验结果表明氧气预热温度升高,ＴｉＯ２粒子粒径减小,分布变窄,反应气氛中加入ＡｌＣｌ３后ＴｉＯ２粒变得圆整,ＴｉＯ２粒径随ＡｌＣｌ３用量增加而减小,粒子中金红石含量随ＡｌＣｌ３用量增加而增大,反应温度升高时ＴｉＯ２粒子粒度增大,但金红石含量在反应温度为１２００℃时出现最大值,控制反应温度为１１     

碱解-酸溶法制备金红石型二氧化钛超微颗粒

以偏钛酸为原料制备水合ＴｉＯ２，经煅烧获得ＴｉＯ２超微颗粒，利用ＸＲＤ、ＴＥＭ等手段测试样品的形态结构。结果表明，水合ＴｉＯ２经３００￣６００℃煅烧可得到金红石相结构，经６００℃煅烧样品粒径为１０￣２０ｎｍ，大小分布均匀。     

纳米TiO2薄膜的制备及其光学特性研究

采用溶胶－凝胶法制备了纳米ＴｉＯ２薄膜,ＸＲＤ研究表明,纳米ＴｉＯ２薄膜随着热处理温度的升高,发生了从非晶状态向锐钛矿相的转变,最后转化为金红石相,ＵＶ－ＶＩＳ、俞 米ＴｉＯ２薄膜的致密度与成膜条件有关,Ｒａｍａｎ表明,随热处理温度的升高,纳米ＴｉＯ２薄膜的振动峰位发生移动,并且谱带明显宽化,表现出尺寸效应。     

云母钛珠光颜料的液相合成技术 Ⅱ云母钛前驱体的热处理过程研究

以ＴＧ－ＥＧＡ等分析检测手段探明了云母铁颜料包膜层的组成，并对其热处理工艺作了系统的研究，得到了较佳的热处理工艺。同时以ＤＴＡ、ＳＥＭ、ＸＲＤ技术研究了膜层ＴｉＯ＿２粒子在煅烧过程中的形态及物相结构变化过程，结果表明，膜层的水合ＴｉＯ＿２粒子在热处理过程中随着温度的升高逐步晶化，并由锐钛相向金红石相转化。实验制得了金红石相含量较高的云母钛珠光颜料，具有闪亮的光泽和鲜明的色调。     

SO^2—4／ZrO2和SO2—4／TiO2固体超强酸催化剂的X射线衍射研究

用ＸＲＤ技术研究了浸渍Ｈ２ＳＯ４后的无定性ＺｒＯ２和ＴｉＯ２在不同焙烧温度下的晶化，相变及平均晶粒度的变化情况，并对四方相ＺｒＯ２的含量进行了初步的考察。实验结果表明，ＳＯ＾２－４的引入提高了氧化物的晶化温度，并对晶型的形成有定向诱导作用，使ＺｒＯ２易于形成四方相型，ＴｉＯ２易于形成金红石型。     

纳米二氧化钛的制备及红外热像分析

以ＴｉＣｌ４为主要原料，利用前驱体法合成纳米ＴｉＯ２粉末．采用Ｘ射线衍射、差热热重分析、热力学计算和红外热像分析，结果表明，当体系中原料配比ＴｉＣｌ４∶Ｎａ２Ｏ２∶ＮａＣｌ＝１∶１∶１５时，二氧化钛为金红石型，粒子平均直径８５ｎｍ；当体系中原料配比ＴｉＣｌ４∶Ｎａ２Ｏ２∶ＮａＣｌ＝１∶２∶１５时，二氧化钛为非晶态，在５７３Ｋ，９２３Ｋ分别发生非晶向锐钛矿和锐钛矿向金红石的晶型转变．     

高频等离子体化学气相淀积法制备TiO2超细粒子

利用ＴｉＣｌ４＋Ｏ２体系，在高频等离子体化学气相淀积反应器中合成了纯度高、粒度细的ＴｉＯ２粒子。考察了工艺条件对ＴｉＯ２粒子物性的影响；探讨了ＴｉＯ２粒子晶型控制的方法，金红石型质量分数可通过工艺条件控制；探讨了ＴｉＯ２粒子晶型控制的方法。金红石型质量分数可通过工艺条件控制，减少ＴｉＯ２单体浓度可提高金红石型质量分数；也可通过在原料ＴｉＣｌ４中添加ＡｌＣｌ３等晶型转化剂，使可转化为单一金红石型Ｔｉ     

Sol—Gel法合成TiO_2超细粉末

用Ｓｏｌ—Ｇｅｌ法成功地合成了ＴｉＯ２超细粉末。研究表明，这样制备的超细粉末在室温至７５０℃之间经历无定形态→锐钛矿→锐钛矿与金红石共存→金红石的相变，其比表面积为１７～２５１ｍ２／ｇ，平均晶粒尺寸为３～１００ｎｍ，杂质含量少，纯度高。     

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。     

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.     

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.