饲料中补充晶体蛋氨酸和羟基蛋氨酸钙对罗氏沼虾幼虾生长性能的影响

饲料中添加30%鱼粉为对照组饲料和6组试验饲料(分别替代对照组中16.67%、33.33%和50.00%的鱼粉,同一鱼粉替代水平的2组分别添加晶体蛋氨酸和羟基蛋氨酸钙,使其蛋氨酸含量与对照组一致)喂养罗氏沼虾(初始体重为(0.29±0.04) g )10周,研究不同鱼粉替代水平下,分别添加晶体蛋氨酸和羟基蛋氨酸钙对罗氏沼虾幼虾生长性能和血清生化指标的影响.结果表明：复合蛋白源替代对照组16.67%鱼粉并补充羟基蛋氨酸钙组的增重率、特定生长率、蛋白质效率和饲料系数同对照组无显著差异(P>0.05);同一鱼粉替代水平下,羟基蛋氨酸钙组的增重率、特定生长率和蛋白质效率均显著高于晶体蛋氨酸组(P<0.05).血清生化组成的分析结果表明：血清总蛋白含量各处理组之间差异显著(P<0.05),对照组血清谷草转氨酶和谷丙转氨酶活力显著低于其他各组(P<0.05),其中同一替代水平下,饲料中添加羟基蛋氨酸钙组谷草转氨酶和谷丙转氨酶活力低于添加晶体蛋氨酸组.由此可见,与晶体蛋氨酸相比,羟基蛋氨酸钙能更有效提高罗氏沼虾生长性能和饲料利用效率.     

52 m/9 Gb/s PAM4 plastic optical fiber-underwater wireless laser transmission convergence with a laser beam reducer

A 52 m/9 Gb/s four-level pulse amplitude modulation(PAM4) plastic optical fiber(POF)-underwater wireless laser transmission(UWLT) convergence with a laser beam reducer is proposed. A 52 m/9 Gb/s PAM4 POFUWLT convergence is practically demonstrated with the application of a laser beam reducer to reduce the collimated beam diameter. A 50 m graded-index(GI)-POF is employed as an underwater extender to efficiently enhance the coverage of UWLT. The performances of PAM4 POF-UWLT convergence in view of bit error rate(BER) and eye diagrams improve with the decrease of the collimated beam diameter because of the small amount of light absorbed by clear ocean water. Competent BER and eye diagrams(three independent eye diagrams) are achieved over a 50 m GI-POF transmission with a 2 m clear ocean water link.     

红茶提取液在盐酸中对碳钢的缓蚀作用

采用动电位极化曲线和交流阻抗（EIS）研究了红茶提取液（BLE）在盐酸介质中对碳钢的缓蚀性能和缓蚀机理。 研究结果表明,采用索氏提取法从红茶茶叶中提取的缓蚀剂,对碳钢在1.0 mol/L盐酸溶液中具有良好的缓蚀性能,随着提取物浓度的增加,缓蚀效率增大。 红茶提取液中的有效缓蚀成分为抑制阴阳极反应的混合型缓蚀剂,在碳钢表面的吸附符合Langmuir等温式,属于单分子层吸附。     

The influence of thermally assisted tunneling on the performance of charge trapping memory

We evaluate the influence of the thermally assisted tunneling (TAT) mechanism on charge trapping memory (CTM) cell performance by numerical simulation, and comprehensively analyse the effects of the temperature, trap depth, distribution of trapped charge, gate voltage and parameters of TAT on erasing/programming speed and retention performance. TAT is an indispensable mechanism in CTM that can increase the detrapping probability of trapped charge. Our results reveal that the TAT effect causes the sensitivity of cell performance to temperature and it could affect the operational speed, especially for the erasing operation. The results show that the retention performance degrades compared with when the TAT mechanism is ignored.     

恒温平行板间多孔介质通道中的分层耗散流动

利用Darcy模型,研究了平行板间充填饱和多孔介质的通道中,在热量入口处传热的粘性耗散效应．讨论了等温边界情况．求得热量入口处局部温度和体积计算平均温度随Nusselt数的分布．给出了独立于Brimkman数的经充分发展的Nusselt数应为6A·D2并观察到,若忽略粘性耗散影响,将导致熟知的内流现象,此时Nusselt数等于4.93．还给出了有限差分数值解．结果表明解析法和数值法的结果吻合很好．     

血液灌流用内毒素吸附材料研究

内毒素血症是败血症致死率极高的主要原因之一,迅速并有效地清除患者体内的内毒素,是临床医学面临的一个难题．用血液灌流的方法,选用有效的吸附剂,通过体外循环从血液中直接清除内毒素,受到了人们越来越多的关注．国内外研究者已开始研究利用该方法治疗内毒素血症,用活性炭     

F-127作为模板剂合成微孔-介孔SAPO-11分子筛及其在长链烷烃异构化中的应用

在常规水热法合成SAPO-11的基础上,添加适量F-127作为软模板构造介孔结构,成功合成出了SAPO-11分子筛微介复合体.考察了F-127添加量对分子筛内部的孔道结构的影响,并通过XRD、N2吸附-脱附曲线、SEM和Py-FTIR等途径对催化剂进行表征.以正十二烷为原料,对负载Pt金属的SAPO-11分子筛进行临氢异构化反应性能评价.结果表明:添加F-127的分子筛内部出现了明显的介孔结构,并且随着F-127添加量的增加,分子筛的介孔孔容呈先增大后减小的趋势;异构化反应结果表明催化剂活性位的数量与分子筛介孔孔容有关;随着温度的升高,异构烷烃转化率升高,异构烃收率下降.催化剂的异构化转化率伴随着F-127的添加量的增加而降低,F-127添加量在一定范围内的增加可使异构烃收率得到提高.在F-127添加量为10;时,异构烃收率达到最高为57.62;.     

光纤环形外腔半导体激光器频偏特性研究

本文给出了在环形光纤外腔光反馈之下半导体激光器频偏特性的小信号分析理论.分析表明,尤其在千兆赫以下的调制频段中,耦合腔相移、内外腔光耦合强度及内外腔光场相位失谐对频偏功率比均有显著影响.可望用作强度调制直接检测高速率、长距离光纤通信系统中的光源.     

UNIFORM GROOVE-DEPTH RAC BY USING TRANSDUCER WEIGHTING

A new weighting method,transducer weighting.for the uniform groove-deph RAC is proposed in thispaper.The weighted input and output transducersform a weighting transversal filter In addition,the groove-width weighting,which can be used as an auxiliary is also discussed. By using the new methods,two uniform groove depth RACs have been designed and fabricated,Thesidelobe suppressions achieved are 31 dB and 32 dB.respectively.The results are considered satisfactorybecause the phase compensation by metal strip was not applied.     

Ronchi光栅光密度的一种测试方法

本文提出利用衍射光栅的反射特性,在自光图像处理系统中对光栅进行实时无损伤检验.这种方法灵敏度高、简便易行,有较高的实用价值.理论与实验结果一致.