电导法确定水溶液中盐的浓度

采用电导法研究了水溶液中液中盐的浓度与其电导率的关系。结果表明,在低浓度范围内电导率与浓度的平方根成线性关系,在较高的浓度范围内,首次发现浓度ρ与电导率ｋ间的定量关系为ｋ＝ａｂρ（１＋ｂρ）＾－１或ｋ＝ａｂρ＾４（１＋ｂρ＾４）＾－１。     

PZT-YBaCuO复合氧化物的制备及热敏特性

报道了ＰＺＴ－ＹＢａＣｕＯ复合氧化物陶瓷的制备及不同温度电导率的测定，表明样品具有很强的热敏功能，温度由室温上升至９４５℃，电导率由３．３３＊１０＾－５（Ω＾－１ｃｍ＾－１）增于１．０４＊１０＾－１（Ω＾－１ｃｍ＾－１），可变化４个数量级。     

YSZ薄膜的阻抗谱测量及其电学性能的研究

应用４１９２Ａ低频阻抗分析仪测量了不同温度下的ＹＳＺ薄膜的阻抗谱,利用Ｂａｕｅｒｌｅ等效电路模型研究了ＹＳＺ薄膜的电导率随温度的变化规律,探讨了掺杂氧化物（Ｙ２Ｏ３）对ＹＳＺ薄膜电导率的影响,其结果表明：ＹＳＺ薄膜的阻抗谱是一个完整的半圆,圆心稍低于实轴,在５００℃时,ＹＳＺ薄膜的电导率为０．０１４Ω＾－１ｃｍ＾－１,且随着测试温度的升高,ＹＳＺ薄膜的电导率增大,稳定剂浓度对ＹＳＺ薄膜的电导率有显     

二阶电路暂态过程的研究

对二阶电路进行换路时,一般情况下都要经历一个暂态过程,并且在暂态过程中有可能出现过电压、过电流现象.用拉普拉斯变换对二阶电路的暂态过程进行了研究,给出了任意二阶电路在换路后不经历暂态过程而直接进入稳态响应的条件.     

电路暂态过程的时间常数

时间常数直接反映了暂态过程的持续时间。在引入一个描述暂态过程衰竭程度的普适量的基础上，给出了对一阶和二阶电路都适用的暂态过程时间常数的统一定义；以RLC串联电路为例，计算了二阶电路暂态过程的时间常数，结果表明在大多数情况下，二阶电路暂态过程的时间常数可用简单的近似公式估算。     

土壤电导率及土壤溶液电导率与土壤水分之间关系

沙性土壤非饱和灌溉实验表明，土壤抽提液电导率和离子强度之间符合线性关系，且土壤溶液电导率和溶液总浓度之间也有很好的线性关系，土壤体电导率和溶液电导率的比值（〉１）与含水量成线性关系，在非饱和情况下用时间域反射仪测得水分和电导率数据，再利用此关系可进行溶质的输运研究。     

退火对CdS多晶薄膜电学性质的影响

对不同温度下退火的ＣｄＳ多晶薄膜测量了暗电导率σｄ和暗电导－温度关系,发现未退火ＣｄＳ的暗电导率为１０－５Ω－１ｃｍ－１,经退火后σｄ增加,在２００℃退火σｄ有极大值．退火后电导激活能Ｅａ减小     

Laβ—Al2O3固体电解质的制备和性能

用直接合成法制备了Ｌａβ－Ａｌ２Ｏ３固体电解质，利用阻抗谱测定了电导率，研究了电导率和温度、ＭｇＯ含量之间的关系，得出最了的组成为ａＭｇ０．４Ａｌ１０．７Ｏ１７．９５。在４５０℃到１０００℃温度下测得电导率为１０＾－６到１０＾－２Ｓ．ｃｍ＾－１，活化能为０．８９ｅＶ到１．０２ｅＶ。测定了８００Ｃ下的离子迁移烽接近于１。     

中学物理涉及日光灯教学的几个实验问题

日光灯管的点亮过程是一种暂态过程。通常,人们很难对此暂态过程进行定量的实验测量,传感器和数据采集系统的出现使实验手段的改进成为可能。本文从传统的实验开始,引出暂态过程的测量及其相关问题的讨论。     

受迫振动暂态过程分析

本文从理论上对暂态过程进行了全面的分析,并指出有关的教科书及论文在讨论暂态过程时的不足之处.     

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.