数字移动通信泛欧制式GSM中的语音编码研究

作者着重对泛欧数字移动通信系统（ＧＳＭ）规则脉冲激励长时预测（ＲＰＥ－ＬＴＰ）语音编码方案中的ＲＰＥ编码部分进行了研究。为了降低编码比特率，提出了一种每子帧１０个激励脉冲的新方案。对它进行了计算机模拟和性能分析，结果表明在１２ｋｂｉｔ／ｓ的编码率下，这种方案满足ＧＳＭ建议０６．１０，即对单个正弦波的帧信噪比要求。又用自适应差分脉冲编码调制（ＡＤＰＣＭ），代替ＲＰＥ－ＬＴＰ方案中的自适应脉冲编码调制     

利用植酸对磺基水杨酸铁的脱色作用比色法测定植酸含量

研究了磺基水杨酸铁同植酸的转络反应所引起溶液颜色的变化，并把该转络反应用于植酸含量的比色测定。溶液酸度为ＰＨ２．５－３时，平衡混合物最大吸收波长为５００ｎｍ，植酸浓度为０．１５１５×１０＾－３－０．１５１５×１０＾－５ｍｏｌ／Ｌ区间内的光吸收符合朗伯比尔定律，该法回收率为１００．６７％。     

钼－桑色素配合物的极谱波研究与应用

在ｐＨ２．１的硫酸－２．９６×１０－６ｍｏｌ／Ｌ桑色素－０．１７２ｍｏｌ／Ｌ氯酸钾底液中，钼在－０．４３Ｖ（ＳＣＥ）有一灵敏的极谱催化波，可用于测定微量钼．线性范围１．０４×１０－９～２．５０×１０－８ｍｏｌ／Ｌ，检出限１．８８×１０－１０ｍｏｌ／Ｌ．　极谱催化波法直接应用于三氧化钨光谱标样中微量相的测定，方法简便，准确可靠。     

钨的极谱波研究及钼精矿中钨的测定

在ｐＨ２．３的磷酸－１．１８×１０（－５）ｍｏｌ／Ｌ桑色素底液中，钨在－１．１４Ｖ（ｖｓ．ＳＣＥ）有一灵敏的极谱波，可用于微量钨的测定．线性范围４．３５×１０（－１０）～２．１８×１０（－８）ｍｏｌ／Ｌ，检出限４．１４×１０（－１１）ｍｏｌ／Ｌ．直接应用于钼精矿中钨的测定，方法简便快速，结果准确．     

地面广播信道中级联码的纠错性能研究

将ＲＳ纠错码应用于地面广播信道中,设计了一种适用于ＨＤＴＶ 信号传输的格状编码调制结合ＲＳ编码的级联方案,给出了数据交织与非交织条件下差错控制系统的计算机模拟结果．模拟结果表明：采用ＲＳ码与交织技术可使信道传输的误码率从１０ － ３ 降至１０ － ７ ,编码增益提高３ ～５ ｄＢ．     

催化光度法测定痕量银Ag(I)-α,α''-Dipy-K_2S_2O_8-ECR体系

用光度法研究了Ａｇ（Ⅰ）－α，α’－ＤｉＰｙ．－Ｋ２Ｓ３Ｏ８－ＥＣＲ催化体系．确定了最佳测定条件为：３．０×１０－３Ｍα，α’－Ｄｉｐｙ，３．８×１０－２Ｍ Ｋ２Ｓ３Ｏ８，１．２Ｘ１０－４Ｍ ＥＣＲ和ｐＨ５．０．方法灵敏，其检测限为１× １０－９ｇ／ｍｌ．本法用于测定氯化银溶度积，经果与文献值相符．     

银丝汞膜电极伏安法测定药品中头孢氨苄

本文以银丝汞膜电极为工作电极，在０．１０ｍｏｌ／ＬＮａＯＨ溶液中经１００℃水浴加热２０ｍｉｎ后，用线性扫描伏安仪制作ＣＥｘ的阴极还原曲线，其峰电位－０．７５Ｖ（ＶＳＡｇ／ＡｇＣｌ），浓度在２．０×１０－７～２．１０×１０－６ｍｏｌＬ－１；２．０×１０－６～２．０×１０－５ｍｏｌＬ－１范围内，峰高与浓度呈线性关系，其线性回归方程ｉ（格）＝１．２８６×１０６ｃ－０．１５０４（ｒ＝０．９９５８，ｃ：２．０×１０－５～２．０×１０－６ｍｏｌ／Ｌ）；ｉ（格）＝１．２３×１０６＋０．７８７０（ｒ：０．９９７３，ｃ＝２．０×１０－６～２．０×１０－７ｍｏｌＬ－１）．方法应用于胶囊中ＣＥｘ的含量测定并与药典法相比，结果基本一致．此外利用循环伏安等方法对其降解产物电化学行为进行初探，该体系属于准可逆吸附体系．     

葛根甙元的电化学行为及其应用研究

葛根甙元在０．１ｍｏｌ·Ｌ－１Ｈ２ＳＯ４底液中，出现一灵敏的示波极谱导数峰。峰电位为－１．１０Ｖ（ｖｓ．ＳＣＥ），峰电流与葛根甙元浓度在５．０×１０－７～６．０×１０－６ｍｏｌ·Ｌ－１范围内成线性关系，检出限为３．０×１０－７ｍｏｌ·Ｌ－１．用于片剂的测定，回收率９７．５％～１０５．０％，用吸附伏安法，当富集时间为６０ｓ时，峰电流与葛根甙元浓度在２０×１０－９～１．０×１０－８，１．０×１０－８～１．０×１０－７ｍｏｌ·Ｌ－１范围内呈线性关系，检出限可达５．０×１０－１０ｍｏｌ·Ｌ－１．用多种电化学手段研究体系的电化学行为，测得电极反应电子数ｎ＝１．电子转移因数α＝０．４５。体系具有吸附性，并符合Ｆｒｕｍｋｉｎ吸附等温式，吸附因数β＝１．３３×１０５，吸引因数α＝０．９５．实验表明，葛根甙元的还原为不可逆两步单电子电极反应过程。     

印楝提取物及双稠哌啶类生物碱对桑天牛存活及生殖的影响

用１．０μｇ／ｍｍ２剂量的黄华碱和野靛碱处理的构树枝分别喂饲桑天牛,黄华碱不表现拒食作用,但野靛碱表现出显著的拒食作用。同样剂量条件下,两种生物碱均能使桑天牛的产卵量和卵孵化率显著下降,但没有引起死亡。用８．０×１０－２,４．０×１０－２,２．０×１０－２,１．０×１０－２,５．０×１０－３μｇ／ｍｍ２剂量的印楝提取物（含ａｚａｄｉｒａｃｈｔｉｎ１０％）处理的构树枝喂饲桑天牛,前二种剂量引起１００％死亡率,２．０×１０－２μｇ／ｍｍ２剂量引起８０％死亡率并导致雌虫不再产卵,而后两种剂量引起的死亡率为３０％和０％,并导致产卵量和卵孵化率较对照急剧地下降。报道了双稠哌啶类生物碱对昆虫引起产卵量和卵孵化率下降作用及天牛科中印楝提取物抑制产卵和卵孵化的作用。     

山西省柳林奥陶系马家沟组第五段第一亚段的白云石化作用

山西省柳林奥陶系马家沟组第五段第一亚段主要由白云岩组成，顶部为灰岩、沉积于浅的、局限的、低能、基底起伏小、蒸发作用强的克拉通内陆表海环境下．白云石的δ１３Ｃ值为－８．１～０．１‰，平均－３．０‰；δ１８Ｏ值为－１０．９～７．１‰，平均－８．９‰；白云石的碳氧稳定同位素值与泥晶方解石差别不大．准同生白云石的δ１３Ｃ为－４．９～０．１‰，平均－２．１‰；δ１８Ｏ值为－１０．３～－７．１‰，平均－８．７‰．成岩白去石的δ１３Ｃ值为－８．１～－３．３‰，平均－５．４‰；δ１８Ｏ值为－１０．９～－７．７‰，平均－９．２‰．白云石的Ｆｅ２Ｏ３含量为０．５１％～２．９９％，平均１．３６％，白云石较泥晶方解石的铁含量高．白云石的Ｓｒ含量为１３～４７（１０－６），平均２３（１０－６），白云石和泥晶解石的Ｓｒ含量均低．白云石较方解石的晶胞体积减少１２．７％左右．白云石化所引起的体积缩小，产生了大量的晶间孔．有利于淡水的渗透、淋滤，晶间孔进一步改造，形成了晶间溶孔和溶蚀孔、洞、缝．白云石样品的ＭｇＣＯ３含量几乎都大于５０ｍｏｌ％，白云石化，是淡水与富镁海水混合的结果．     

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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