海水养殖杂交鲟耗氧量、耗氧率和窒息点的研究

研究了海水养殖条件下杂交鲟的耗氧量、耗氧率和窒息点,结果表明:在平均水温10.5℃,平均盐度26.7,平均pH值7.8的养殖条件下,体重272.2～384.7 g,体长38.5～42.9 cm的杂交鲟耗氧量为18 314.17～31 328.99 mg/h,耗氧率为63.93～102.14 mg/kg·h,窒息点为0.51～0.63 mg/L.在一定范围内杂交鲟的耗氧率随水温的升高而提高;耗氧率随盐度上升而下降;pH值对杂交鲟的耗氧率也有一定的影响.此外还与淡水养殖条件下,杂交鲟的耗氧量、耗氧率和窒息点进行了比较.     

真鲷耗氧率的初步研究

应用测定流水中溶氧量的方法 ,对真鲷耗氧率进行研究 .结果表明 :真鲷耗氧率随水温的升高而升高 ,鱼平均体重 1 2 0 .6～ 1 3 2 .4g,水温 1 9℃时 ,按鱼体重计 (下同 ) ,耗氧率为 2 .677μg/(g·min) ;2 9℃时 ,耗氧率达 5 .841 μg/(g·min) .真鲷的耗氧量随个体的增大而增大 ,耗氧率则随个体的增大而降低 .在水源 pH7.4、盐度 2 1、水温 1 9℃条件下 ,鱼平均体重 1 2 9.5 g ,耗氧率存在昼夜变化 ,1 7∶0 0耗氧率最高 ,为 (3 .877±0 .2 5 7) μg/(g·min) ,0 7∶0 0耗氧率最低 ,为 (1 .0 3 1 ± 0 .2 5 5 ) μg/(g·min) .真鲷白天的平均耗氧率为 2 .1 62 μg/(g·min) ,夜间的平均耗氧率为 2 .2 71 μg/(g·min) ,其代谢水平的昼夜变化不明显 .     

斑点叉尾鮰鱼苗阶段耗氧率和窒息点的测定

在实验室内测定30尾斑点叉尾鮰鱼苗的群体耗氧率和窒息点.鱼苗平均体长2.11cm,平均体重0.10g.试验用水为曝气24h以上的自来水,水的碱度2.60mgN/L,硬度1.15mgN/L,pH值7.2,溶氧5.86mg/L.结果表明,在水温28.2℃～28.5℃时的斑点叉尾鮰鱼苗的耗氧率为0.5233mg/g@h,耗氧量为0.0544毫克/尾@小时,窒息点为0.5226mg/L.斑点叉尾鮰的耗氧率呈现出明显的昼夜变化.     

厦门湾条纹斑竹鲨生物学特性

根据2014—2016年福建厦门湾海域(118°E～118.4°E,24.4°N～24.6°N)渔业资源监测调查资料,对采集到的384尾条纹斑竹鲨(Chiloscyllium plagiosum Bennett,1830)测量其全长、体重等生长参数,利用ELEFAN技术和Pauly经验公式对厦门湾条纹斑竹鲨的全长-体重关系、Von Bertalanfy生长方程和死亡参数等生物学特征进行计算。结果表明:2014—2016年厦门湾水域条纹斑竹鲨,平均全长为318 mm,优势全长组为250～300 mm(占比为28.0%);平均体重179 g,其中占比最高(17.4%)的体重组为40～60 g;条纹斑竹鲨全长-体重之间的关系式为W=5×10~(-6)L~(2.9435),Von Bertalanfy生长方程的参数分别为L_∞=94.5 cm,K=0.45,t_0=-0.2349 a~(-1),生长拐点的年龄为2.1643龄;总死亡系数(Z)为1.53,自然死亡系数(M)为0.6869,捕捞死亡系数(F)为0.8431,渔业资源正处于过度捕捞状态。     

硬刺高原鳅耗氧率与窒息点和体质量关系的研究

为了探讨硬刺高原鳅耗氧率与窒息点和体质量相关关系,以平均体质量为1.73、7.22、16.52 g的3组硬刺高原鳅为试验材料,对硬刺高原鳅耗氧率进行测定。结果表明:硬刺高原鳅耗氧率存在明显的昼夜变化规律,3组规格硬刺高原鳅白天耗氧率分别为0.30、0.20、0.14 mg/(L·h),夜间分别为0.21、0.17、0.11 mg/(L·h),白天耗氧率和夜间耗氧率有显著性差异(P0.05)。硬刺高原鳅耗氧率与体质量的相关关系,符合方程:y=0.313 6x~(-0.299)(R~2=0.930 2)。硬刺高原鳅耗氧量随体质量增加而增加,耗氧率随体质量增加而降低,窒息点随体质量增大而升高,窒息点分别为0.39、0.70、1.18 mg/L。通过研究硬刺高原鳅的耗氧率与窒息点,为硬刺高原鳅呼吸生理方面的研究提供理论数据。     

斑点叉尾鱼苗阶段耗氧率和窒息点的测定

在实验室内测定 30尾斑点叉尾鱼苗的群体耗氧率和窒息点。鱼苗平均体长 2 .1 1cm,平均体重 0 .1 0 g。试验用水为曝气 2 4 h以上的自来水 ,水的碱度 2 .60 mg N/ L,硬度 1 .1 5mg N/ L,p H值 7.2 ,溶氧 5.86mg/ L。结果表明 ,在水温 2 8.2℃～ 2 8.5℃时的斑点叉尾鱼苗的耗氧率为 0 .52 33mg/ g·h,耗氧量为 0 .0 544毫克 /尾·小时 ,窒息点为 0 .52 2 6mg/L。斑点叉尾的耗氧率呈现出明显的昼夜变化     

斑点叉尾鮰鱼苗阶段耗氧率和窒息点的测定

在实验室内测定30尾斑点叉尾Hui鱼苗的群体耗氧率和窒息点,鱼苗平均体长2．11cm,平均体重0．10g,试验用水为曝气24h以上的自来水,水的碱度2．60mgN/L,硬度1．15mgN/L,pH值7．2,溶氧5．86mg/L,结果表明,在水温28．2－28．5度时的斑点叉尾Hui鱼 耗氧率为0．5233mg/g.h,耗量为0．0544毫克／尾．小时,窒息点为0．5226mg/L,斑点叉尾Hui的耗氧率呈现出明显的昼夜变化。     

网箱养殖大黄鱼和美国红鱼的耗氧率与氮排泄率

对个体重20～250 g的大黄鱼和个体重150～1400g的美国红鱼在不同水温(29.7,15.9,9.7,18.3,26.4℃)条件下的耗氧率和氮排泄率进行了测试分析,结果表明:在相同温度条件下,大黄鱼和美国红鱼的耗氧率和氮排泄率取决于鱼体体重,随着体重的增大,耗氧率和氮排泄率降低;而在相同体重条件下,耗氧率和氮排泄率则取决于水温,即随水温的升高,耗氧率和氮排泄率也随之增高.同时还分析了养殖鱼类的自身代谢对水质的影响.     

花鳗鲡和欧洲鳗鲡耗氧率的研究

采用自制鱼类呼吸器测定了花鳗鲡和欧洲鳗鲡钰在饥饿2天,水温为28～29℃条件下的耗率及其昼夜变化规律。花鳗鲡的昼夜平均耗氧率为73．49mg／kg．hr;欧洲鳗鲡的昼夜平均耗氧率为48．75mg／kg．hr。两种鳗鲡的耗氧率均表现一定的昼夜变化。花鳗鲡耗氧率在白天的波动幅度比欧洲鳗鲡大,夜间两种鳗鲡耗氧率的波动幅度相似。一天24小时,花鳗鲡耗氧率有2次低峰期,即7：00和19：00为低峰期,15：00为高峰期,两次低峰期耗氧率分别为31．59mg／kg．hr和26．74mg／kg．hr,一次高峰期的耗氧率为135．77mg／kg．hr。欧洲鳗鲡耗氧率24：00时最高,为112．58mg／kg．hr,9：00时最低,为21．70mg．／kg．hr。     

月鳢耗氧率与窒息点的初步研究

对月鳢的耗氧率和窒息点进行了初步研究,结果表明: ( 1)无论是水呼吸还是气呼吸,月鳢的耗氧率均随试验鱼个体增大而降低,随水温或气温的升高而升高; ( 2) 月鳢夜间的平均耗氧率略高于白天平均耗氧率; ( 3) 月鳢的窒息点也是随鱼体增大而降低,随水温升高而升高; ( 4) 气呼吸在月鳢的呼吸活动中占有较重要的位置.     

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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