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微生态制剂在80∶20池塘养殖中的应用及经济效益分析 被引量:7
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作者 李南充 钟雷 +4 位作者 杨克 余平 李远鹏 吉红 任同军 《水产科学》 CAS CSCD 北大核心 2015年第4期251-255,共5页
本试验研究了在80∶20养殖模式池塘中应用微生态制剂的生产效益及经济效益。试验塘两口,面积均为0.13 hm2,水深为1~1.3 m ,放养平均体质量242 g的鲤鱼0.42 kg/m3,160 g鲢鱼和330 g鳙鱼0.07 kg/m3。处理组鲤鱼投喂添加微生态... 本试验研究了在80∶20养殖模式池塘中应用微生态制剂的生产效益及经济效益。试验塘两口,面积均为0.13 hm2,水深为1~1.3 m ,放养平均体质量242 g的鲤鱼0.42 kg/m3,160 g鲢鱼和330 g鳙鱼0.07 kg/m3。处理组鲤鱼投喂添加微生态制剂Ⅰ和Ⅱ(每千克饲料各5 mL的饲料,对照组鲤鱼只投喂同样颗粒饲料。40 d和80 d的养殖试验表明,处理组鲤鱼的平均体质量(627 g )高于对照组鲤鱼(565 g ),质量增加量(8961.67 kg/hm2)较对照组(6319.80 kg/hm2)高2641.87 kg/hm2,增加41.8%;处理组滤食性鲢和鳙质量增加量低于对照组。处理组池水氨氮含量低,p H值正常,溶氧量高;饲料系数(饲料成本)比对照组低7.8%;处理组鱼总产值比对照组增加了36888.90元/hm2。 展开更多
关键词 微生态制剂 80∶20养殖模式 生长性能 经济效益
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Interpretation of thermal dependence of magnetic aftereffect for magnetic nanocomposite with slow decay rates
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作者 Shuo Gu Yi Jin +5 位作者 Gary R.Kahler Ming Zhang Peijie Chen Mohammadreza Ghahremani Edward Della Torre Lawrence H.Bennett 《International Journal of Smart and Nano Materials》 SCIE EI 2013年第2期91-101,共11页
A new experimental characterization is presented of time-,field-,and temperature-dependent dynamic effects in magnetization of a nanocomposite which displays slow decay.Field and temperature variations of irreversible... A new experimental characterization is presented of time-,field-,and temperature-dependent dynamic effects in magnetization of a nanocomposite which displays slow decay.Field and temperature variations of irreversible susceptibility,χirr,decay coefficient,S,fluctuation field,hf,and activation volume,V,have been calculated for the nanocomposite sample(Co_(80)Ni_(20))using a recently developed modified Preisach–Arrhenius(MPA)model.The sample is composed of non-interacting nanoparticles having negligible reversible magnetization.Non-Arrhenius behavior is observed in both the maximum decay coefficient,Smax,and the fluctuation field,hf,as a function of temperature T.The peak of both temperature curves are identical and occur at a critical temperature Tk of∼50 K,which agrees with our experimental results.Based on the effect of a temperature-dependent chemical potential on energy barrier,hf is studied for T<Tk and T≥Tk,respectively.A more complete MPA model that can predict the magnetization as function of time,field and temperature for a magnetic material with slow decay rates is proposed.This model uses a multi-variable analytical formula,m(ln(t),H,T),which incorporates the characteristic parameters. 展开更多
关键词 magnetic aftereffect fluctuation field numerical modeling Co_(80)Ni_(20)nanocomposite
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