Effects of Pre-exposure Mouse Pituitary with Low-dose ^60Co γ-ray on Growth Hormone （GH） and Body Mass Induced by Subsequent High-dose Irradiation

The pituitary of the B6C3F1 hybrid strain mice were irradiated with 0.05 Gy of ^60Co γ-ray as the pre-exposure dose (D1), and were then irradiated with 2 Gy of ^60Co γ-ray as challenging irradiation dose (D2) at 4h after per-exposure. Body weight and serum growth hormone (GH) were measured at 35th day after irradiation. The results showed that irradiation of mouse testes with 2 Gy of ^60Co γ-ray significantly diminished mousebody weight and level of serum GH (Table). Pre-exposure with a low-dose (0.05 Gy) of ^60Co γ-ray significantly alleviated reductions of mouse body weight and level of serum GH induced by subsequent a high-dose (2 Gy) irradiation (Table). The data suggested that low-dose ionizing irradiation can induce adaptive responses to the harmful effects of pituitary by subsequent high-dose exposure.     

Generation of Ultrashort Light Bullets in Dispersive Kerr Media Using the Fourth—Order Dispersion—Dependent Spatiotemporal Instability

A new method for generation of a train of ultrashort pulses or a sequence of ultrashort light bullets is proposed. This method is based on the fourth-order dispersion-dependent spatiotemporal instability in dispersive Kerr media. The repetition-rate of the generated bullets can be made quite large by increasing the corresponding spatial modulation frequency locating in the new instability region resulted from fourth-order dispersion.     

正常金属/超导/正常金属双垒隧道结中的量子相干输运

考虑到量子相干效应和界面散射效应 ,利用 L ambert理论模型 ,计算正常金属 /绝缘层 /超导 /绝缘层 /正常金属双垒隧道结中的准粒子输运系数和隧道谱。研究表明 :( 1)所有的准粒子输运系数和电导谱在超导能隙之上都随能量作周期性振荡 ,其振荡周期依赖于超导层的厚度 ;( 2 )在超导能隙之上 Andreev反射系数随能量呈现周期性消失现象 ;( 3)在绝缘层势垒强度取很大的隧道极限下 ,超导层中会形成一系列的准粒子束缚态 ,其位置由量子化条件决定 ;( 4)界面散射效应不仅能压低各子能隙电导峰 ,还能使子能隙电导峰劈裂为两个峰。     

电信运营市场上过度进入的供给分析

本文在分析光纤主干网和本地接入服务市场上电信运营商的供给行为的基础上,首先证明了拥有主干网的运营商愿意租出自己的部分光纤,接着分析证明了上述两市场上使投资更倾向于过度的乘数效应,并进一步证明网络外部性使乘数效应更加明显.旨在对我国电信运营市场发展给出一些参考意见.     

Fluorescence Microscopy of Nanoscale Silver Oxide Thin Films

The experimental conditions for photoactivated intermittent fluorescence from nanoscale silver oxide were studied with fluorescence microscopy.Strong fluorescence was observed from the Ag2O particles with size of 10-20nm excited with both blue and green light .We observed the saturation of Photoexcitation with blue light and explained the experimental results using the model of agglomeration of silver atoms to form small clusters and the fluorescence of Ag2 and Ag3 clusters.     

稀磁合金的电子比热与s—d混合效应的影响

本利用Ａｎｄｅｒｓｏｎｓ－ｄ混合模型和Ｆａｌｉｃｏｖｓ－ｄ库化互作用模型，定量地研究关于稀磁合金的ｓ－ｄ混合效应和ｓ－ｄ库化互作用效应对低温电子比热及有效热质量的影响。     

声致冷和声制冷机

本文介绍声致冷的基本原理、有关的数量关系和美国 ＬｏｓＡｌａｍｏｓ实验室推出的一台实验声制冷样机及其性能。     

闭排队网络中性能势与无穷小实现因子之间的关系

In this paper,the concept of the infinitesimal realization factor is extended to the parameter-dependent performance functions in closed queueing networks. Then the concepts of realization matrix (its elements are called realization factors) and performance potential are introduced,and the relations between infinitesimal realization factors and these two quantities are discussed. This provides a united framework for both IPA and non IPA approaches. Finally,another physical meaning of the service rate is given.     

两水相体系中聚乙二醇浓度的测定

1 引言 利用两水相体系作为生物反应器进行生物转化反应,或者提取生物大分子,近年来受到国内外关注。聚乙二醇(PEG)-葡聚糖(Dextran)是最常用的两水相体系,在实际应用中,了解上下两相的组成是十分必要的,因此,建立合适的测定两水相体系的方法是研究和应用两水相体系的基础工作。本文用分光光度法测定PEG