用多层基本气流综合预报台风路径

本文用“台风的准平衡移动”一文中给出的台风移动与各层基本气流关系式,结合香港天文台业务资料,设计了一个预报方案.分别用差分格距Δn=5°、10°、15°、20°、25°(纬距)计算各层基本气流,对1976年—1982年经过10°N—30°N,105°E—125°E 的所有台风作了2198次预报.24小时平均予报误差相当于或稍优于(当Δn=25°)目前国内外预报误差.     

斜磁场作用下双阱中的混沌轨道

对斜磁场作用下双阱中的电子运动进行了分析 .磁场倾斜角θ=0°时 ,Hamiltonian系统是可积的 ,θ=2 0°时 ,系统的混沌特性比较明显 ;运动轨道的混沌特征还和无量纲能量的大小有着密切联系 ,无量纲能量越大 ,表现出的混沌特性越明显 ;轨道表现出的性质将取决于局部阱的形式 .     

流体攻角对滴形钉头管流体阻力特性的影响

利用风洞实验 ,研究了Re =1× 10 4～ 1× 10 5范围内滴形钉头管在不同攻角下的流阻特性 .实验结果表明 ,攻角对滴形钉头管的流阻特性影响显著 ,流阻最小值出现在攻角α为 180°时 ,最大值出现在攻角α为10 0°～ 110°时 .还给出了不同攻角下Eu与Re之间的关联式 .     

脉冲可调谐钛宝石激光向短波长扩展的研究

对利用和频技术将脉冲钛宝石激光向短波长方向扩展的可能性进行了研究 .在仔细分析了脉冲钛宝石激光器结构的基础上 ,确定了用 KTP晶体实现钛宝石激光与倍频后剩余的 Nd∶ YAG激光和频的方案 .实验中选用两块 KTP作为和频晶体 ,切割角度分别为 θ=85°,φ=90°和 θ=76°,φ=90°,采用 (A)类相位匹配方式 ,获得了 45 9.3～ 5 0 9.6 nm的和频光 ,最大转换效率为 15 .2 % ,最大输出能量为 14.6 m J(在 46 3nm处 )     

弹丸前体喷流的气动力干扰实验研究

对一种复合增程弹的气动力干扰特性进行了实验研究,这种复合增程弹的固体火箭发动机位于弹丸肩部,通过几个均匀分布于弹体园柱部起始处的喷咀侧后向喷气产生推力,从而达到增程的目的.实验是在超声速风洞中进行的,实验Ma数为2.5,攻角α=0°～6°,喷咀倾角θ=30°,喷流压力比ε=Poj/P∞=101.222,喷流介质为冷空气.实验结果表明,喷流后弹丸阻力系数下降,升力系数上升,压心后移.并对引起气动力变化的原因做了简要分析.     

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采用时间分裂有限元法对IALR生态系统下降段的流体动力学N-S方程进行求解, 讨论了锥角（θ=50°, 55°, 60°, 65°, 70°, 75°）及雷诺数对IALR流动性能的重要影响.     

影响轴承性能参数计算的几个因素和PKJ过程《摘要》

本文对如何提高轴承的静、动特性计算的计算速度和精度就以下几个方面进行了探讨和定量分析: 1.采用不同压力函数形式(P或Ⅱ=PH~(3/2)); 2.采用偏导数法和采用差分法(或小扰动法)求动特性; 3.采用不同边界选择法确定油膜破裂边位置; 4.在以上讨论基础上,根据PIJ过程编制了PKJ通用程序; (一)对180°无限长园弧瓦(θ=90°)计算实例(如图1),其静、动特性解析解如下.     

非水体系中磷酸镓大单晶合成与结构

非水体系中制备了GaPO4单晶,用X射线测定晶体结构的方法对化合物进行了表征.晶胞参数a=0.4908lnm,b=0.4908lnm,c=l.1066nm,α=90°,β=90°,γ=l20°.结构中的镓和磷均与氧形成四面体配位,骨架中的氧为二桥氧.无Ga-P连接方式,质子化的乙二胺阳离子未在孔道中.     

试论二十四（节）气与太阳黄经值的对应关系

二十四（节）气在黄道上的位置若用太阳黄经值来表示，并不是π=15°×n,(n1,2,…，12），而是π=359°59′9′·71/24×n=14°59′59′×n(n=1,2,…，12）     

非水体系中磷酸镓大单晶合成与结构

非水体系中制备了GaPO4单晶,用X射线测定晶体结构的方法对化合物进行了表征.晶胞参数α=0.490 8lnm,b=0490 8lnm,c=1.1.106nm,α=90°,β＝90°,γ=120°.结构中的镓和磷均与氧形成四面体配位,骨架中的氧为二桥氧.无Ga-P连接方式,质子化的乙二胺阳离子未在孔道中.     

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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