日粮中添加硒和维生素E对肉鸡免疫系统的影响

试验旨在研究有机硒、无机硒及维生素E对肉鸡免疫系统的影响。试验选用130只1日龄肉鸡分为3个组,其中A和B组为试验组,各60只鸡,C组为对照组,10只鸡。A组日粮中添加有机硒和维生素E,A组又细分为A1、A2、A3、A4、A5和A6组,其中有机硒的添加量分别为0.25、0.25、0.5、0.5、1.0和1.0 mg/kg,维生素E的添加量为0、200、0、200、0和200 IU/kg。B组日粮中添加无机硒和维生素E,也分为B1、B2、B3、B4、B5和B6组,其中无机硒的添加量分别为0.25、0.25、0.5、0.5、1.0和1.0 mg/kg,维生素E的添加量为0、200、0、200、0和200 IU/kg。C组为对照组,饲料中不添加硒和维生素E。检测指标包括新城疫病毒(HI)抗体滴度、免疫器官的病理变化、免疫器官指数和生长性能。试验结果表明,日粮中加入有机硒后,能提高肉鸡免疫力,效果优于添加无机硒;同时,硒与维生素E配合使用的效果优于单一添加硒。

巴基斯坦地方地震台网的检测能力和可靠性分析

利用Bungum和Husebye的方法,分析了地方地震台网的检测能力和可靠性.用标准的计算机定位程序重新测定了地震位置.根据25年的地震记录,分别由震级-频度关系导出的50%、90%和100%的累积检测率估计了检测水平.对台网内地震,相应于100%检测率的震级下限为ML=1.7.用台网内固定的实际震源,研究了台网对震源位置的测定精度.对网内地震,震中测定误差小于4 km.最后讨论了台网连续工作时可能会遇到的影响检测能力的一些问题.

Shocks and Solitons in Ultradense Degenerate Electron-Positron-Ion Plasmas

震动和 solitons 的形成和繁殖被雇用 Thomas 费密模型在 unmagnetized，包含电子和正电子的退化费密气体的 ultradense 血浆，和古典离子气体调查。为这个目的，一个使变形的 Korteweg-de Vries 冰山(dKdVB ) 方程为冷、断热、等温的离子用减少的 perturbative 技术被导出。在平面几何学的 dKdVB 方程的局部性的分析答案为分散以及驱散被获得主导的案例。为 nonplanar (圆柱、球形) 几何学，改变 dKdVB 方程的数字冲击波答案的时间被发现。它导致 soliton 答案的主导的大小写也是的分散讨论了。离子温度，正电子集中和驱散的效果在这些非线性的结构上被发现重要。到科学兴趣的系统的结果的关联被指出。

Coherent nonlinear structures in dense electron positron plasma

It is shown that rarefactive-type double layer structures exist in ultradense electron-positron plasma.For this purpose,an extended Korteweg de Vries equation is derived and solved analytically in the low amplitude limit by employing the appropriate fluid equations.A strong influence of quantum degeneracy pressure of electrons and positrons,quantum diffraction effects and concentration of background positive ions on double layer is noticed.It is also pointed out that the amplitude and steepness of the double layer increases with an increase in ion concentration or ion charge number.The results are examined numerically for some interesting cases of dense plasmas with illustrations.

Propagation of Ion Solitary Pulses in Dense Astrophysical Electron-Positron-Ion Magnetoplasmas

In this paper,we theoretically investigate the existence and propagation of low amplitude nonlinear ion waves in a dense plasma under the influence of a strong magnetic field.The plasma consists of ultra-relativistic and degenerate electrons and positrons and non-degenerate cold ions.Firstly,the appearance of two distinct linear modes and their evolution is studied by deriving a dispersion equation with the aid of Fourier analysis.Secondly,the dynamics of low amplitude ion solitary structures is investigated via a Korteweg-de Vries equation derived by employing a reductive perturbation method.The effects of various plasma parameters like positron concentration,strength of magnetic field,obliqueness of field,etc.,are discussed in detail.At the end,analytical results are supplemented through numerical analysis by using typical representative parameters consistent with degenerate and ultra-relativistic magnetoplasmas of astrophysical regimes.

Damped Kadomtsev–Petviashvili Equation for Weakly Dissipative Solitons in Dense Relativistic Degenerate Plasmas

We have investigated the properties of three-dimensional electrostatic ion solitary structures in highly dense collisional plasma composed of ultra-relativistically degenerate electrons and non-relativistic degenerate ions. In the limit of low ion-neutral collision rate, we have derived a damped Kadomtsev–Petviashvili(KP) equation using perturbation analysis. Supplemented by vanishing boundary conditions, the time varying solution of damped KP equation leads to a weakly dissipative compressive soliton. The real frequency behavior and linear damping of solitary pulse due to ion-neutral collisions is discussed. In the presence of weak transverse perturbations, soliton evolution with damping parameter and plasma density is delineated pointing out the extent of propagation using typical parameters of dense plasma in the interior of white dwarfs.