日本落叶松硫酸盐浆漂白特性

为了解日本落叶松的纸浆物理性能,以日本落叶松KP浆为原料,对纸浆的漂白特性进行了系统研究.结果表明:在常规CEH三段漂白中,最佳有效氯质量分数为8%,NaOH质量分数为2.5%,漂白纸浆白度可达到71%(ISO);在CDEHD漂白中,最佳有效氯质量分数为9%,EH段合理NaOH质量分数为2%,纸浆白度能够达到81%(ISO);在D/CE1D1E2D2和DE1D1E2D2漂白中,当总有效氯质量分数为7.9%时,两种漂白流程都能将纸浆漂到82%(ISO)的高白度.采用过氧化氢加强氧漂再加两段过氧化氢漂白的漂白流程(即OpQP1P2)可以将白度为27.3%(ISO)的纸浆漂到76.6%(ISO).     

新型造纸原料洋麻的硫酸盐法制浆及ECF漂白

以洋麻为研究对象,分析了洋麻的化学成分,研究了不同H因子下硫酸盐法制浆(KP)的较优工艺,以及KP浆的ECF漂白性能及较优的漂白工艺.结果表明:洋麻的硝酸-乙醇纤维素含量为45.00%,酸不溶木素含量为16.50%,聚戊糖和抽出物含量均较低,是优良的造纸用原料;KP法蒸煮较优的制浆工艺为H因子1000、活性碱用量20%、硫化度22%,该工艺下细浆得率达44.9%、卡伯值为20.4、残碱质量浓度为11.67 g/L;ECF漂白的较优ODED漂白工艺为OD0,2%EpD1,1.5%,该工艺条件下终漂浆白度可达82.3%ISO.     

微波辐射应用于麦草浆漂白工艺的研究

将微波辐射代替传统水浴加热应用于H2O2麦草浆漂白工艺中。研究了微波辐射时间、辐射功率、H2O2用量和NaOH用量等因素对纸浆漂白效果的影响。通过与传统水浴加热漂白对比发现,达到相应白度时微波辐射漂白时间大大缩短;微波辐射漂白纸浆粘度没有过多下降;微波辐射漂白废水中的残余过氧化物只有水浴漂白的10%。正交实验结果表明H2O2用量的影响最大,其次是微波辐射时间和NaOH用量,影响最小的是微波输出功率。最佳实验条件为微波辐射功率240?W、辐射时间25?min、H2O2用量5％和NaOH用量4％时纸浆白度约为59％ISO,纸浆粘度大于620?mL·g-1,纸浆硬度约为390。     

马尾松磨木浆H2O2高白度漂白的研究

H2 O2 是一种常用的氧化性漂白剂 ,本研究对马尾松磨木浆 (SGW )进行了单段H2 O2 漂白和两段H2 O2漂白试验 ,确定了H2 O2 漂白的最佳工艺参数。当采用两段H2 O2 漂白时 ,纸浆白度可由原浆的 4 7 8%提高到74 5 % ,按此法制得的漂白浆能满足低定量高白度胶印新闻纸和其它高级纸种的生产要求     

2株重寄生木霉菌丝生长的生物学特性

对2株茶藨生柱锈菌(Cronartium ribicola J.C.Fischer)重寄生木霉(Trichoderma spp.)TR1、TR2菌株菌丝生长及产孢条件进行单因素筛选及正交实验。结果表明：TR1菌丝生长速度快,且极易产生分生孢子;TR2菌丝生长速度相对较慢,产孢受一定条件限制。光照和VB2能明显刺激TR2分生孢子的产生。2株菌在以大麦粉、黄豆粉、KH2PO4、复合VB为培养基,5%接种量、120r／min、pH为 6的条件下菌丝生长最佳。TR1和TR2菌丝生长的最适温度范围及水势分别为25～30℃、-232MPa和20～25℃、-454MPa.     

CH4/O2/CO2层流预混火焰传播速度实验研究

采用本生灯法,测量了CH4/O2/CO2混合气在不同工况下的层流预混火焰传播速度.采用基于火焰图像的全面积法计算本生灯火焰的传播速度.主要研究了化学当量比(08~12)、氧气体积分数(25%~35%)和稀释剂种类(N2,CO2)对火焰传播速度的影响规律.结果表明:当化学当量比为1时火焰传播的速度达到最大值,在其两侧火焰传播速度逐渐下降;火焰传播速度随着氧气体积分数的增加而增加,且火焰传播速度与氧气体积分数呈二次函数关系;与N2相比,高浓度CO2降低了火焰传播速度,CH4在O2/CO2气氛下的火焰传播速度约为O2/N2气氛下的五分之一.     

烧碱-AQ法麦草浆全无氯漂白的研究

研究了烧碱-AQ法麦草浆全无氯漂白(OQP)流程中氧脱木素、整合处理和过氧化氢漂白的影响因素．结果表明;氧脱木素段NaOH用量2．5％,MgSO4用量0．5％,浆浓10％,温度105℃,氧压0．7MPa,时间75min时脱木素效果较好,对后续漂白有利．整合处理pH值为3时,浆料的自度最高,卡伯值最低．压力H2O2漂白的最佳工艺条件为;浆浓10％,H2O2 3．5％,NaOH1．5％,MgSO2 0．05％,EDTA 0．2％,氧压0．6MPa,温度105℃,时间2h．在优化条件下,漂终白度达82．2％ ISO．     

白腐菌改性桉木CTMP浆的漂白研究

利用白腐菌改性处理可以显著提高机械浆的强度性能,有利于拓宽机械浆的应用范围.本文采用白腐菌Trametes hirsute 196对桉木CTMP浆进行改性处理,并探讨了白腐菌处理后纸浆的漂白工艺.研究结果表明:白腐菌处理使桉木CTMP浆白度值从49.6%下降到37.8%,且这种改性后纸浆的可漂性较差,H2O2和Na2S2O4单段漂后纸浆白度均在60%以下,但采用Na2S2O4—H2O2两段组合漂白工艺可以使漂后Bio-CTMP浆白度达到71.3%.     

桉木硫酸盐浆TCF漂白的研究

研究桉木硫酸盐浆H2O2强化的氧脱木素效果;研究KMnO4和螯合物对桉木硫酸盐氧漂浆H2O2漂白的改善效果,并对其最佳工艺条件及各种因素对漂白效果的影响进行探讨。结果表明：在氧脱木素过程中加入少量的H2O2,就能起到很好的强化效果;氧漂浆在KMnO4的预处理、DTPA处理后再经过H2O2漂白,可使KP法桉木浆白度达80％以上。     

马尾松SGW高白度全无氯漂白研究

对马尾松磨石磨木浆(SGW)进行了单段H2O2漂白和2段H2O2漂白试验，研究了不同预处理方法和条件对H2O2漂白效果的影响，提出了最佳的预处理工艺；同时还研究了以EDTA和MgSO4作为金属螯合剂改善H2O2漂白效果，进而确定了H2O2漂白的最佳工艺参数．结果表明，应用EDTA和MgSO4作为金属螯合剂，SGW经预处理后，采用两段H2O2漂白，漂后纸浆白度可由原浆的47．8％提高到74．5％，从而使制得的漂白浆能满足低定量高白度胶印新闻纸和其他高级纸种的生产要求．结果还表明，与传统CEH3段漂白相比，漂白废水中的CODCr减少78．5％，BOD5减少97％，且不再含有可吸附的有机卤化物(AOX)．     

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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