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1.
运用三种数据处理方法对伏安法测电阻实验所得实验数据进行了处理,对比其结果表明,对于同一组实验数据,不同的数据处理方法所得结果明显不同。因此,对实验数据处理方法的选择是实验中应重视的问题。实验者应根据实验目的要求,选择相应的数据处理方法。  相似文献   

2.
拉伸法测金属杨氏模量实验的改进   总被引:3,自引:0,他引:3  
传统的拉伸法测金属杨氏模量实验、实验过程不够科学、实验仪器不便调节等缺点,方法和过程适当地进行完善,克服了以上缺点,存在着实验条件难以保证、实验方法不够完善、该文用游标卡尺对实验装置进行改进,并对实验提高了实验精度。  相似文献   

3.
虚拟仪器技术在汽车测试技术实验中的应用   总被引:3,自引:1,他引:3  
阐述了利用虚拟仪器编程软件Labview开展汽车测试技术课程实验的方法,分析了使用该方法进行教学实验的特点。该方法与传统实验方法相比,能够节约实验设备硬件的投入,加深学生对传感器转换原理、测试系统组成原理等知识的理解,提高学生的实验兴趣和主动性。  相似文献   

4.
报道了乙醇酸催化制取乙醚的改进方法,该方法减少了实验步骤,降低了实验费用,缩短了实验时间,提高了乙醇的产率。  相似文献   

5.
免疫学实验是学生了解免疫学相关知识和技能最直接有效的手段,如何在有限的时间内让学生了解到更多的实验知识及掌握更多的实验技能,对实验教学方法不断改进显得非常重要。本人结合自身的实验教学经验,对MTT比色法检测NK细胞活性的实验方法进行了改进,取到了满意的实验教学效果,并从该实验方法的改进中体会到,教学要不拘泥于书本,要敢于开拓创新;做好实验前的准备是保证实验教学成功的关键;学生做好实验前的预习是实验成功的保障。  相似文献   

6.
本对环己醇用高锰酸钾氧化法制备己二酸的实验步骤提出了改进措施,使实验过程简化,实验时间缩短,以及实验产率提高。改进的实验方法优于献中实验方法。  相似文献   

7.
两种重铬酸钾测铁实验方法的比较   总被引:1,自引:0,他引:1  
通过两种重铬酸钾测铁的实验,建立了两种实验方法比较的实验,使学生学会运用数据检验的方法,拓宽分析化学实验的应用面。  相似文献   

8.
RC积分电路实验研究   总被引:1,自引:0,他引:1  
通过对RC积分电路响应的分析研究,以实验的方法加以验证,最后总结出了进行实验时应注意的问题,及实验中培养学生科学实验方法。  相似文献   

9.
通过更新实验仪器,改革实验教材和实验方法,培养学生更大的学习兴趣。信息技术的发展在物理实验中广泛应用,提高了学习效率,实验的效果更加明显。  相似文献   

10.
张玉龙 《科技资讯》2009,(31):213-213
本文从五个方面分析了加强学生分组实验的方法,以切实搞好学生分组实验,进一步提高实验的效果,达到实验目的。  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

14.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

15.
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。  相似文献   

16.
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.  相似文献   

17.
本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。  相似文献   

18.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

19.
20.
The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to  相似文献   

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