浅谈初中物理演示实验

物理是一门以实验为基础的科学，人们在大量实验的基础上观察、总结物理现象，抽象出一系列的物理概念和规律，并把概念、规律和图景联系起来，了解他们的物理意义。课堂中教师可通过演示实验，把要研究的实验展示在学生眼前，引导学生观察现象、思考问题、动手操作，教师从旁指导，充分发挥学生的主体作用，本文通过理论来说明演示实验对教学质量起着什么样的作用，通过演示实验来，得出规律，理解物理概念，用演示实验来进行习题课的教学     

物理实验与物理仿真实验

在学生学习和熟悉定律的过程中有一个很好的方法，可以部分代替学的物理实验，它就是仿真实验，仿真实验有它的许多优点，也有它的局限性，但有在学生学习和熟悉定律定律的过程中，优点能得到充分发挥；局限性则必须通过实际操作的物理实验来弥补，因此仿真实验是一个部分代替学生物理实验的好方法，我们可以把它作为一种辅助教学手段来使用。     

谈对碰撞实验改进的几点体会

在碰撞实验中通过减少补正量，引入多种实验方案，来节省实验数学时间，通过三个光电门配套使用，提高实验结论的可信度。     

机床动刚度模型实验研究

本文介绍了应用有机玻璃模型来研究机床动刚度的实验工作。其中包括模型激振实验和测定 有机玻璃动态弹性模量等实验技术，并通过量纲分析和比较模型与实物实验结果，得出相似关系。 实验中还应用了激光全息干涉技术来测定模型的振型。     

自感现象演示实验的改进

自感现象演示实验的改进谭黔（贵州师大物理系贵阳５５０００１）传统的自感现象演示实验，都是采用两个线路，并通过线路中小灯泡的亮度变化来进行观察的。多次实验中发现，自感现象不仅可似通过小灯泡的亮度变化来进行观察，还可以利用电压表的指针摆动情况来进行观察，...     

化学实验中防止倒吸的装置例析

在制取氧气的实验完成后，要先移出导气管再熄灭酒精灯，否则水将倒吸入试管中导致试管破裂．但是该实验在实验过程中，当试管受热不匀时，水也可能倒吸入试管中导致试管破裂．也就是说实验过程中和实验完成后都有可能发生倒吸现象，本文主要来探讨在实验过程中的倒吸现象．     

将物理实验融入高中教学之探研

物理教学必须以实验为基础，实验在物理教学中占有举足轻重的地位。现今高中物理教学中，实验仍是薄弱环节。文章结合多年来的教学实践，阐述了如何将物理实验与教学更好地结合起来，为社会培养真正的人才。     

如何提高学生在物理实验中的动手操作能力

物理学是一门实验性很强的基础科学，很多的物理规律、定律、定理都是从实验中得出来的，它与我们的实际生活有密切的联系，在我们的日常生产生活中蕴含着大量的物理知识，学生应掌握用实验的方法来探索尚未认识的现象、规律，这就要求我们的学生要有较好的实验能力。     

浅谈化学实验中的环保意识

从两个方面论述了教师在化学实验中提高对环境保护的认识和如何对学生进行环境保护教育，并在教学中通过改进实验，开展微型实验减少环境污染来完成教学任务．     

初中物理实验教学内容与实施

在中学物理实验教学中，通过具体的演示实验、学生分组实验及小实验和小操作来体验具体的物理过程，认知物理概念的内涵，从而培养学生学习物理的兴趣。     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

An Index mechanism for multi-scale view in spatial databases

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-