库尔勒香梨果实发育过程中有机酸代谢规律研究

库尔勒香梨果实发育阶段有机酸代谢是果实品质形成的决定因素之一,有机酸作为植物生化反应的中间体和终产物,其含量和组分变化对植物机体发育过程具有调控作用.以8个发育关键阶段库尔勒香梨果实为试材,分别测定总酸,开发并使用高效液相色谱法同时定性、定量8种有机酸组分及含量变化.结果表明:库尔勒香梨果实在发育前期总酸含量高(1.3...     

库尔勒香梨病虫害发生发展趋势及防治措施

库尔勒香梨是巴州的特色产品、支柱产业。随着其种植面积产量的不断增加，市场竞争也日趋激烈。因此提高对库尔勒香梨病虫害发生发展趋势的再认识及采取因地制宜的防治措施就显得尤其重要。作者通过多年的科研生产实践及对库尔勒周边香梨园的调查了解，基本掌握了库尔勒香梨病虫害发生发展趋势及防治措施，愿与同行共同探讨。     

出口基地库尔勒香梨综合配套栽培技术

生产绿色香梨是适应市场需求，增强库尔勒香梨在市场中竞争力，扩大出口创汇，不断增加农民收入，振兴地方经济的重要举措之一。近年来，我们在继续增加香梨面积的同时，把香梨品质的快速提高，切实把香梨产业做活、做强、做大，努力提高香梨的商品率，创库尔勒香梨品牌，把提高香梨在农民增收中的份额作为重要工作来抓。现将出口基地库尔勒香梨综合配套技术总结如下：     

基于卫星遥感数据的库尔勒香梨识别提取方法研究

针对目前国内利用卫星遥感数据的光谱特征及其植被指数对香梨识别提取方法鲜有研究的现状,探讨研究了Landsat8_OLI数据对不同树龄香梨的识别提取方法和实际应用。以库尔勒市中部的英下乡和沙依东园艺场为试验区域。采用多时相Landsat8_OLI数据。通过分析试验区内典型地物的光谱特征和植被指数的变化规律以及作物物候历的不同,选择不同树龄香梨树林遥感识别的最佳时相,利用决策树方法构建了不同树龄香梨树林的识别提取模型,实现了香梨种植面积的有效提取。结果表明:1香梨成林(种植5a以上的香梨树林)遥感提取效果较为满意,精度为93.51%,而香梨幼林由于受多种因素的影响,其提取精度只有78.79%,有待进一步研究;2 Landsat8_OLI数据具有较高的时空分辨率,是遥感识别提取库尔勒香梨的潜力数据源。     

库尔勒香梨套袋试验研究初报

果实套袋技术是提高果实商品性、减少农药残留量、增加果农经济效益的一项重要技术措施。近年来，这项技术已在苹果、梨、葡萄等果树生产上得到了广泛的应用。库尔勒香梨上虽然做过一些套袋试验，但还无成功的报道。为了给香梨套袋、生产无公害食品开辟一条成功之路，提高库尔勒香梨的商品价值，我们总结了以往的经验，于2002年进行了库尔勒香梨套袋实验研究工作，现将试验结果简介如下：     

库尔勒香梨振动信号调理电路的设计与验证

无损检测和分级是提高库尔勒香梨的市场竞争力的关键,基于振动频谱特性的无损检测技术能够实现库尔勒香梨的内部品质检测和分级。为了使振动频谱法检测库尔勒香梨坚实度的装置实现便携化应用,本研究针对香梨振动信号的特点,设计了由电荷放大电路、电压放大电路、低通滤波电路、高通滤波电路和电压偏置电路组成的信号调理电路。仿真和实验结果表明:该调理电路能够对香梨振动的微弱电荷信号进行有效的放大和滤波,所测得的信号与通用电荷放大器所获得的信号基本一致,两者输出信号的峰值平均值偏差在1%以内,调理电路背景噪声最大为1.5 m V。该调理电路体积小、成本低,有望在库尔勒香梨的无损检测研究中替代通用电荷放大器以实现检测装置的便携化应用。     

黄叶速克对库尔勒香梨黄化病防治效果试验报告

通过在库尔勒香梨上叶面喷施不同浓度的“黄叶速克”，观察分析“黄叶速克”在本地区对库尔勒香梨黄化病的防治效果，同时筛选出较为适宜的喷施浓度，为以后大面积示范推广提供科学依据。     

加强知识产权保护 做大做强库尔勒香梨产业

香梨是巴州特色农产品，截止到2005年底，巴州境域内香梨种植面积已达60多万亩，产量20万吨，产值近6亿元，香梨产业已经成为带动农民致富、推动农村发展的优势特色产业。特别是自治区在塔里木盆地建设1200万亩林果基地的发展规划，给库尔勒香梨产业发展带来了难得的机遇，但同时，库尔勒香梨产业发展也遇到了不少困难和实际问题。因此，要把香梨产业发展好，做大做强就必须实施品牌战略，加强知识产权保护，只有产权化才能产业化，要产业化必须产权化。     

常温下壳聚糖涂膜保鲜库尔勒香梨的研究

以壳聚糖为主剂,配制了一种新型、安全无毒的库尔勒香梨涂膜保鲜剂。用该保鲜剂对香梨进行保鲜试验,结果表明壳聚糖涂膜保鲜剂能明显减少失重,延缓衰老,保持较低的呼吸速率,维持了较高的叶绿素和维生素C含量。壳聚糖保鲜剂对库尔勒香梨有较好的保鲜效果。     

库尔勒香梨腐烂病、优斑螟防治新措施

库尔勒香梨属新疆名特产品，是巴州地区重要的农业支柱产业。全区香梨而积有40万亩，而腐烂病发生而积达20万亩，平均发病率50％，严重影响了香梨产业的发展。     

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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