鄱阳湖轮虫种类组成与现存量季节变动的初步研究

根据Ｋｏｓｔｅ提出的轮虫分类系统对鄱阳湖１９８７－１９８９年６个采样站的轮虫调查资料进行了分类，并报道了其现存量的调查结果。笔者共观察到轮虫８５种，隶属于３３个属，２０个科。鄱阳湖轮虫新记录２８种。翻阳湖轮虫的数量变动曲线与生物变动曲线都呈现夏，秋季两个高峰，冬，春季为低贬期。     

鄱阳湖桡足类的群落组成与现存量季节变化的初步研究

根据１９８７￣１９８９年在鄱阳湖进行的６个采样站的调查资料,共获得２３种浮游桡足类,隶属３目６科１６属。新记录１０种。根据各种类出现的月份,把２３种桡足类分成终年出现型,夏秋季型、冬春季型和畏严冬型;并据出现的区域,归成沿岸型,敞水型和广布型。年数量变动曲线与生物量变动曲线有春、夏和秋季三次高峰。秋季高峰比春,夏季高峰更突出,持续时间约两个月,但生物量与数量三次高峰出现的时间并不完全一致。笔者还初     

鄱阳湖桡足类的群落组成与现存量季节变动的初步研究

根据１９８７～１９８９年在鄱阳湖进行的６个采样站的调查资料,共获得２３种浮游桡足类,隶属３目６科１６属。新记录１０种。根据各种类出现的月份,把２３种桡足类分成终年出现型、夏秋季型、冬春季型和畏严冬型;并据出现的区域,归成沿岸型、敞水型和广布型。年数量变动曲线与生物量变动曲线有春、夏和秋季三次高峰。秋季高峰比春、夏季高峰更突出,持续时间约两个月,但生物量与数量三次高峰出现的时间并不完全一致。笔者还初步讨论了影响桡足类群落的生态因子。     

黔西北地区农田害鼠调查及防治探讨

1989年1月至1991年12月,作者在贵州西北部9个县境内的各种农田中选择了50个点,广泛调查了农田害鼠的种类、数量、季节数量变动及优势鼠种的繁殖情况等。全年农田鼠类数量的最高峰在9月份;黑线姬鼠和锡金小家鼠的繁殖高峰均在春季的5月和秋季的9月,高山姬鼠在夏季的6—7月。     

漩门港浮游植物种类组成与数量分析

根据1997年11月至1999年8月要样资料结果表明,漩门港的浮游植物共存6门59属150种,其种类组成和细胞数量具有明显的季节更替和变动现象,年数量高峰表成于夏末秋初的8月（10^7个/m^3),低谷出现在早春2月（10^4个／m^3).     

漩门港浮游植物种类组成与数量分布

根据 1997年 11月至 1999年 8月采样资料结果表明：漩门港的浮游植物共有 6门 59属 150种。其种类组成和细胞数量具有明显的季节更替和变动现象。年数量高峰形成于夏末秋初的 8月 (10~7个 /m~3),低谷出现在早春 2月 (10~4个 /m~3)。     

拉萨河中上游春季原生动物群落特征

为了研究拉萨河中上游原生动物群落多样性,2015年5月和2016年5月,分别在拉萨河中上游设置了8个站点,采用25号浮游生物网分两批采集了32个水样.在室内采用活体镜检和固定染色相结合的方法鉴定物种,直接计数法统计数量.共鉴定到原生动物76种,隶属于2门5纲15目34科41属,其中纤毛门物种占总物种的65.59%,鞭毛门占34.21%.多样性指数平均为2.12,优势度指数不明显,表明拉萨河中上游原生动物物种分布相对均匀,群落结构稳定.通过原生动物群落参数指标和水体主要理化因子作二元变量相关性分析,结果显示原生动物群落特征参数指标与水体理化因子之间无显著相关性.     

鱼池浮游动物变动规律与鱼产力的关系

在北京双桥鱼场,经三年来研究,鉴定出浮游动物84种,其中轮虫29种。虽然轮虫仅占浮游动物数量的16.87％,但在生物量上,却要占到浮游动物生物量的72.80％,说明轮虫明显地左右着浮游动物生物量的变动。从浮游动物年变动规律分析,一年有1～2次高峰,生物量的高峰多出现在6～7月,占总调查高峰次数的60％。本文还从水质、水温、饵料等因素,分析了对轮虫生物学上的影响,探讨了轮虫和浮游动物生物量之间的相关性,最后对浮游动物等转化鳙鱼鱼产力的估算值与其实际产量进行了比较与分析。     

淡水原生动物与水体污染之关系

本文通过对西河原生动物种类及数量变化的调查,比较了各河段污染优势种数量及多样性指数,并对淡水原生动物与水体污染的关系,及西河水体污染程度作了探讨。     

赣江中下游浮游动物时空分布特征及水质综合评价

对2010年12月与2011年7月赣江中下游各监测断面中浮游动物类群的结构组成、优势类群进行调查,结果表明:赣江中下游浮游动物有4类41种;种类最多的是轮虫类,共计7科15属25种,占总数的60.98%;枝角类5科6属7种,占17.07%;桡足类与原生动物占21.95%。时间分布上浮游动物丰度丰水期大于枯水期,密度变动范围为100~522个/L,其中丰水期轮虫、枝角类、桡足类与原生动物密度分别占浮游动物密度的61.7%,11.4%,18.9%与7.8%;枯水期轮虫、枝角类、桡足类与原生动物密度分别占浮游动物密度的65.3%,9.5%,16.0%与9.1%。浮游动物密度空间分布上呈现中间大、两端小的特点,最大值出现在4号监测点新干,最小值出现在10号监测点赣州。赣江中下游浮游动物数量结构主要由轮虫和桡足类组成,生物量结构则主要由桡足类和枝角类组成。生物多样性及水质综合评价为轻度污染至中度污染。     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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