数字心电图机内定标电压测量不确定度的评定

数字心电图机是医院常用的诊断用医疗设备,已经列入国家强制检定的医疗计量器具目录中.医院以前常用模拟心电图机,依据JJG543-2008《心电图机》检定规程进行计量检定,对每个参数进行不确定度评定,现在数字心电图机已经普及到各大医院,依据JJG1041-2008《数字心电图机》检定规程对数字心电图机进行计量检定,通过对两个检定规程的比较发现,检定依据和方法发生了很大变化.为了帮助医生更好地应用数字心电图机的检定数据,对临床诊断有进一步的指导意义,本论述将根据数字心电图机计量检定规程评定数字心电图内定标电压的测量不确定度.     

量块中心长度测量结果不确定度的评定

测量结果不确定度主要反映量值的可疑程度,只有量值而没有不确定度的数据不是完整的测量结果。文章结合量块检定工作实际,以准确度等级为4等的量块中心长度测量为例,按照JJG146-2003《量块检定规程》进行测量,并依据JJF1059-2007《测量不确定度评定与表示》要求,阐述了量块中心长度测量结果不确定度的评定方法。     

心电图机检定要点初探

依照国家计量检定规程介绍了心电图机检定方法,按照检定原理对检定项目进行了分类,并且从不确定度分析的角度探讨了心电图机检定时需注意的要点。在日常检定工作中,为避免发生误判,需严格遵守检定规程要求进行检定,注意操作细节,以实现量值的准确传递。     

水准仪视准线误差测量不确定度的评定

简要介绍了用JSJ-Ⅱ型检验仪,校验水准仪视准线误差测量不确定度的方法,给出了i角测量数学模型和不确定度传播率的计算公式,讨论了标准不确定度评定、合成标准不确定度,比较了级别不同被校水准仪的不确定度测量结果,得出了该方法满足JJG 425—2003水准仪检定规程要求的结论。     

平板平面度测量结果不确定度评定探讨

按照JJF1059-1999测量不确定度评定与表示的要求,对JJG117-2005《平板检定规程》中的平面度测量结果不确定度重新进行公式推导计算,提出不同与《平板检定规程》中平面度测量结果不确定度评定与表示的方法,提高了测量结果的评定准确性。     

雨量传感器检定结果的不确定度分析

为保证气象仪器检定结果的可信程度,提高全区气象自动站探测设备数据的准确可靠,依据JJF1059.1-2012《测量不确定度评定与表示》中的不确定度评定思路及相应的检定规程,对使用新一代气象检定系统进行检定的自动气象站雨量传感器的检定结果进行了不确定度分析。确定了雨量气象要素传感器的检定流程、数据处理方法,并对检定过程中影响检定结果不确定度的因素进行了详细分析。该方法同样适用于其他气象要素传感器检定结果的不确定度分析。     

测量不确定度在仪器仪表的评定与表示的方法

计量器检定校准和检测实验室迫切需要可供参考的同类量值参量的测量不确定度评定与表示的方法．国家技术监督局曾制定了一套计量检定证书的规格和要求，尤其在按GB／T19000-ISO9000系列标准建立质量体系时，要求对测量不确定度进行全面评定，用以作为保证测量结果，可靠的依据．近十年来，随着实验室认可体系和质量认证体系在我国的推行，以及法定计量检定机构考核工作的开展，测量领域中不确定度的多种表述方法亟待统一，并应与国际通行做法接轨，以推动科技进步，促进国际交流．     

TCM-IOD型多电量检定装置测量不确定度的评定及验证

根据检定规程和测量不确定度评定的要求,对TCM-IOD型多电量检定装置的测量不确定度进行了分析及评定。     

光照度计照度示值检定中影响因素和测量结果不确定度分析

该文介绍了光照度计检定的方法,并重点分析光照度计测量结果检定中的主要影响因素并进行测量结果不确定度的分析。     

TCM-10D型多电量检定装置测量不确定度的评定及验证

根据检定规程和测量不确定度评定的要求,对TCM-10D型多电量检定装置的测量不确定度进行了分析及评定.     

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.     

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.     

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.     

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.     

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-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with