板栗化学疏雄技术

疏雄是提高板栗单位面积产量和果实品质的有效技术措施,但是人工疏雄费工、费时,难以在生产上推广。化学疏雄具有方便简单,省工省时,增产效果明显的特点。板栗化学疏雄醇是广东海洋大学刘魁英教授主持河北省八五科技攻关项目研制开发的板栗专用疏雄剂     

板栗化学疏雄技术

疏雄是提高板栗单位面积产量和果实品质的有效技术措施,但是人工疏雄费工、费时,难以在生产上推广。化学疏雄具有方便简单,省工省时,增产效果明显的特点。板栗化学疏雄醇是广东海洋大学刘魁英教授主持河北省八五科技攻关项目研制开发的板栗专用疏雄剂,经过     

板栗化学疏雄技术研究

人工疏雄可显著地增加板栗产量和质量,但人工疏雄难以在生产上推广,化学疏雄具有操作简单、省工省时和增产效果显著的特点。为此,试验研究了不同药剂、不同品种、不同浓度和不同时期疏雄醇对板栗雄花的疏除效果,提出了板栗化学疏雄的适应品种和药剂,选择了合适的疏雄时期和浓度。     

贮藏温度和包装方式对油

研究了不同贮藏温度和包装方式处理组合条件下油果实呼吸强度、品质成分和脂质过氧化作用与耐贮性的关系.结果表明,以(3±1)℃+0.04mm厚度PE薄膜袋包装+100mg/kg保鲜剂Ⅱ号+乙烯吸收剂处理组合贮藏效果最好,能有效抑制果实呼吸强度和品质成分的变化,提高SOD活性和抑制POD活性上升及MDA含量增加,贮藏77 d时,好果率达100%,失重率仅为0.87%,且未发现果肉褐变.呼吸跃变前POD活性上升可作为果实衰老的一个标志,油果肉褐变与果实衰老有关.     

壳聚糖涂膜对黄花梨常温贮藏效果的影响

以黄花梨果实为试材,采用浓度0%,0.5%,1.0%,1.5%,2.0%壳聚糖溶液浸泡黄花梨果实1min,在室温下贮藏16d,研究了壳聚糖涂膜处理对黄花梨果实贮藏品质的影响.试验结果表明:与清水处理相比,4种壳聚糖涂膜处理均可不同程度降低果实的失重率和腐烂率,抑制果实贮藏后期可溶性固形物、可滴定酸和维生素C含量下降,保持果实较好的硬度,从而延缓了果实的成熟衰老.其中1.0%壳聚糖涂膜处理的果实贮藏16d,其腐烂率和失重率分别为12.8%和3.34%,而对照的分别是27.3%和6.46%,与对照的差异显著,果实品质好,保鲜效果最佳.     

采前外源植物激素与采后1-MCP处理对糖心苹果贮藏品质的影响

为解决糖心苹果采后糖心品质快速劣变问题,提高果实贮藏品质,以阿克苏糖心苹果为材料,研究了采前3种外源植物激素与采后1-甲基环丙烯(1-MCP)协同处理对糖心苹果贮藏品质的影响。结果表明,3种处理方式均能在一定程度上提高糖心苹果的贮藏品质。赤霉素与1-MCP处理可有效促进糖心的形成并延缓其消失,贮藏180d后糖心仍有较大面积占比;脱落酸与赤霉素分别协同1-MCP处理均可有效提升果实外观色泽和鲜艳度;生长素与1-MCP处理综合品质调控效果最好,低温贮藏6个月期间可较好地维持果皮和果肉色泽属性,果皮色相角有效降低3.43%,果肉L*值提升1.47%,有效抑制果实呼吸强度6.53%~9.21%,并推迟30d出现呼吸峰,果实失重率和腐烂率分别降低了3.49%和1.12%,分别提升可溶性固形物和维生素C含量1.32%和10.72%。此外,生长素与1-MCP协同处理后,果实硬度提升3.25%,水溶性果胶含量降低19.23%,多聚半乳糖醛酸酶活性始终维持在较低水平,有效延缓了果实采后软化过程。因此,生长素与1-MCP协同处理是一种安全有效的糖心苹果保鲜新技术,应用前景广阔。     

热处理对板栗酶活性及贮藏品质的影响

对“青扎”板栗果实在50℃热处理60min，研究板栗果实的贮藏效果以及贮藏过程中的生理变化，并与未经热处理的栗果对照，结果表明：热处理能抑制栗果贮藏过程中的呼吸强度、POD活性、CAT活性；降低了淀粉酶活性、可溶性糖和还原糖含量；显抑制板栗中真菌发生和蔓延，降低了果实的失重率，但Vc含量有所降低．     

橄榄果实防腐保鲜及包装技术研究

研究了不同防腐保鲜剂和不同厚度聚乙烯(PE)薄膜袋、不同包装材料及包装方式对檀香橄榄果实贮藏保鲜效果的影响.结果表明在试验所说使用的防腐保鲜剂中以25%抑霉唑乳油剂1mL·L1+增效剂20 mg·1-1对橄榄果实防腐保鲜效果最好,常温贮藏125 d,好果率83.13%,失重率3.54%;包装材料以0.060 mm厚的PE袋为好;薄膜打孔的包装方式贮藏保鲜效果最好,8±1℃贮藏75 d,好果率96.40%,失重率0.64%,果实仍鲜绿、饱满,具有新鲜果实的原有风味、颜色和品质;用PE袋包装可以有效地抑制橄榄果实失水,从而延长果实贮藏期.     

热处理结合壳聚糖涂膜对板栗贮藏效应的影响

将经过 50℃热处理 6 0min的“青扎”板栗浸渍于商品壳聚糖涂膜剂中浸渍 15s,与 50℃热处理 6 0min的果实及未处理果实进行对照 ,样品均置于 0± 1℃的冷柜中冷藏 ,观察不同贮藏时期SOD活性、呼吸强度及腐烂率和失重率变化 .结果表明 :热处理结合壳聚糖处理在贮藏过程中控制了板栗果实的呼吸强度和失重 ,并保持较高的SOD活性 ,随着贮藏时间的延长 ,SOD活性呈现逐渐下降趋势 ,腐烂率均显著低于CK ,也低于单独进行热处理的果实 .     

安喜布对采后番木瓜的贮藏品质的影响

为了研究安喜布对采后番木瓜果实贮藏品质的影响,用质量分数分别为0,4×10-7,8×10-7,1.2×10-6的安喜布(1-MCP)处理采后番木瓜的果实,并置于25℃下贮藏,结果表明:安喜布能够延缓番木瓜果实的硬度下降和色泽变化,抑制其果实腐烂病害的发生,延缓果实中TSS,TA,VC的含量变化,保持果实的贮藏品质,推迟果实成熟衰老的进程.其中,尤其以w(1-MCP)=8×10-7的处理效果最佳,于30℃贮藏时,果实转黄率为92%,可以正常转黄,并且硬度适中,食用时酸甜可口.     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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