退火温度对Fe_(73.5)Co_(0.3)Cu_1Nb_3Si_(14.2)B_8合金带材磁性能的影响

用单辊法制备的宽为20 mm,厚为25μm的Fe_(73.5)Co_(0.3)Cu_1Nb_3Si_(14.2)B_8合金带材,绕制成外径为40 mm,内径为25 mm的环型磁芯,再将磁芯进行退火处理。分析了合金带材的晶化行为,研究了退火温度对合金磁芯磁性能的影响。结果表明,淬火态Fe_(73.5)Co_(0.3)Cu_1Nb_3Si_(14.2)B_8合金带材为非晶态,一级起始晶化温度T_(x1)为512.8℃,二级起始晶化温度T_(x2)为671.9℃,当退火温度升高到550℃,在非晶基体中析出Fe(Si)软磁相,形成了非晶和纳米晶双相共存结构。当退火温度低于550℃时,随着退火温度的升高,合金磁芯的初始磁导率μ_i和饱和磁感应强度Bs增大,矫顽力Hc减小;当测试频率f和最大磁感应强度Bm不变时,合金磁芯的有效幅值磁导率μ_a增大,比总损耗Ps和交流矫顽力Hc减小;当测试频率f不变时,合金磁芯的电感Ls和品质因数Q增大。     

微量镍元素添加对铁基非晶/纳米晶磁芯软磁性能的影响

用单辊法制备的宽20 mm,厚25μm的Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9和Fe_(73.5)Ni_(0.3)Cu_1Nb_3Si_(14.2)B_8合金带材,绕制成外径为40 mm,内径为25 mm的环型磁芯,然后将磁芯在不同的温度下进行退火处理,研究了微量Ni元素添加对合金带材的晶化行为以及对横向磁场退火后的非晶/纳米晶磁芯的软磁性能的影响。结果表明:与Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9合金带材相比,添加微量Ni元素的Fe_(73.5)Ni_(0.3)Cu_1Nb_3Si_(14.2)B_8合金带材的一级起始晶化温度Tx1和一级晶化峰温度Tp1降低,其二级起始晶化温度Tx2和二级晶化峰温度Tp2升高,两级起始晶化温度之间的差值ΔTx增大;与横向磁场退火后的Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9非晶/纳米晶磁芯相比,横向磁场退火后的Fe_(73.5)Ni_(0.3)Cu_1Nb_3Si_(14.2)B_8非晶/纳米晶磁芯的起始磁导率μi和饱和磁感应强度Bs减小,矫顽力Hc增大;当测试频率f和最大磁感应强度Bm不变时,有效幅值磁导率μa增大,比总损耗Ps和矫顽力Hc减小;当测试频率f不变时,电感Ls和品质因数Q增大;当励磁电流I不变时,感应电动势E大。     

环氧树脂封装对铁基纳米晶磁芯磁导率和伏安特性的影响

用宽为20 mm、厚为25μm的Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9非晶带材绕制成环形磁芯,将其经550℃×100 min晶化退火处理后制成纳米晶磁芯,研究了环氧树脂封装对纳米晶磁芯磁导率和伏安特性的影响。结果表明,与环氧树脂封装前相比,环氧树脂封装后,纳米晶磁芯的磁导率μ、电感Ls、有效磁导率μe和品质因数Q减小;当励磁电流I小于800 m A时,感应电动势E减小,当励磁电流I大于800 m A时,感应电动势E增大。     

Mg0.1Zn0.9O薄膜制备和光学性能研究

采用溶胶-凝胶技术在石英衬底上制备了Mg0.1Zn0.9O薄膜并研究了退火温度对薄膜结构、形貌和光学性能的影响.XRD结果表明,所有薄膜均呈六角钎锌矿结构,当退火温度高于700℃时,薄膜结晶质量变差;AFM结果显示,随退火温度升高,晶粒尺寸增大,当退火温度高于700℃时,薄膜表面出现团聚颗粒;UV-Vis结果表明,所有薄膜均在紫外区存在较强带边吸收,随退火温度升高吸收边红移;PL谱显示,所有薄膜均存在较强的紫外发射峰,随着退火温度升高,紫外发射峰逐渐红移且在700℃退火处理下紫外发射最强.     

退火温度对Fe73.5Cu1Nb1.5Mo1.5V1Si13.5B9非晶合金电？…

本文从理论和实验上研究了退火温度对Ｆｅ７３．５Ｃｕ１Ｎｂ１．５Ｍｏ１．５Ｖ１Ｓｉ１３．５Ｂ９非晶合金电阻率和磁阻的影响,发现当退火温度〉４００℃时,约化电阻率开始明显变小,在５５５℃时达到最小值,随着退火温度再进一步提高,约化电阻率起始也随之提高,然后变化不大,经不同温度退火后的非晶合金样品的横向磁阻在不同强度的磁场作用下没有明显变化,为进一步了解非晶合金的微观结构和导电机制以及建立新的理论提供准     

退火温度对Fe_(73.5)Cu_1Nb_(1.5)Mo_(1.5)V_1Si_(13.5)B_9非晶合金电阻率和磁阻的影响

本文从理论和实验上研究了退火温度对Ｆｅ７３．５Ｃｕ１Ｎｂ１．５Ｍｏ１．５Ｖ１Ｓｉ１３．５Ｂ９非晶合金电阻率和磁阻的影响，发现当退火温度＞４００℃时，约化电阻率开始明显变小，在５５５℃时达到最小值．随着退火温度再进一步提高，约化电阻率起初也随之提高，然后变化不大，经不同温度退火后的非晶合金样品的横向磁阻在不同强度的磁场作用下没有明显变化，为进一步了解非晶合金的微观结构和导电机制以及建立新的理论提供准确和重要的实验结果．     

Co66Fe4Mo2Si16B12结构与磁性能的研究

采用铁芯测试仪测得合金样品的初始磁导率随温度的变化曲线,定出居里温度;用磁化强度小角旋转法测量非晶及晶化合金条带的饱和磁致伸缩系数λs;研究了不同温度退火后Co66Fe4Mo2Si16B12合金的磁性.结果表明:Co66Fe4Mo2Si16B12合金经退火后非晶相和剩余非晶相的居里温度随退火温度升高而提高;Co66Fe4Mo2Si16B12合金经高于500℃退火后磁性能变坏,是饱和磁致伸缩系数变大所致.     

退火条件对Fe基纳米晶合金磁性的影响

详细研究了非晶Ｆｅ７２．７Ｃｕ１Ｎｂ２Ｖ１．８Ｓｉ１３．５Ｂ９合金在纳米晶化过程中退火温度与退火加热速度对合金磁性的影响，实验结果表明，当退火温度Ｔａ低于５３０℃时，随着Ｔａ的提高合金磁导率缓慢增加。当Ｔａ高于５４０℃时，磁导率迅速增加，５７０℃退火时磁导率出现峰值，实验发现，在纳米晶化过程中退火加热速度对合金的初始磁导率ｕｉ有明显的影响，ｕｉ随着退火加热速度的提高而增大。     

退火温度对5A06挤压型材组织及性能的影响

通过对型材微观组织的观察及维氏硬度、晶间腐蚀和剥落腐蚀等的测试,研究了退火温度对5A06挤压型材组织及性能的影响。结果表明,随着退火温度的升高,晶粒发生了回复、再结晶和晶粒长大三个阶段。当退火温度达到175 ℃时,型材发生低温回复,硬度变化不大,耐蚀性较差;在225～325 ℃退火,型材发生完全再结晶,硬度变化较明显,耐蚀性得到改善;当退火温度高于325 ℃时,晶粒长大,硬度略降低,耐蚀性变差。结合5A06挤压型材组织及性能研究可知,确定退火温度为225～325 ℃。     

超高强度冷轧双相钢组织与性能

在Gleeble-3500热模拟试验机上进行冷轧超高强度双相钢的连续退火工艺研究,利用光学显微镜、扫描电镜、透射电镜和拉伸试验研究了连续退火过程中各个参数对1 000 MPa级冷轧双相钢组织性能的影响.结果表明:试验用钢在退火温度800℃下保温80 s,可以得到抗拉强度为1030MPa、延伸率为14%超高强双相钢;随着退火温度的升高,屈服强度和抗拉强度降低.当退火温度为830℃时,显微组织中粒状的非马氏体组织明显增多.过时效温度低于300℃时,屈服强度和抗拉强度变化不大;当过时效温度超过300℃时,抗拉强度急剧下降,屈服强度先降低后升高,在过时效温度为360℃时开始出现屈服平台.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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