计算机主动网络的研究与应用

该文对主动网络及其相关的研究成果进行了介绍。主动网络作为一种动态的运行环境 ,它支持大量的网络服务 ,同时也允许在网络体系结构中加入新设计的服务。主动网络不像传统网络那样只是被动地传输字节 ,而且具有提供使用者输入定制程序到网络中的一种能力

基于液质联用的代谢组学:从分离亲水或疏水性代谢物扩展到整体代谢物的分离

LC-MS based metabonomics: separation window extending from either hydrophilic or hydrophobic metabolites to global metabolite

Development of off-line two dimensional liquid chromatography-mass

Lipidomics is a rising field and has been concerned by more and more researchers, due to lipid metabolism is one of the three metabolism of human being, and various influencing human health diseases all have a relationship with lipids, such as cancer, diabetes and heart disease. Liquid chromatography is a powerful tool for the separation and analysis of lipids. Although the separation technique is developed constantly, one dimensional chromatography still has not sufficient power to separate the lipids in comprehensive biological samples adequately, neither a reverse phase chromatography, nor a normal phase chromatography. In our study, we developed an off-line two dimensional chromatography method for separation and analysis of lipids from comprehensive biological samples. A diol normal phase column was employed as the first dimension, and a T3 reverse phase column was used as the second dimension. The retention time of the first dimension was stabilized by suitable equilibrium condition, so the lipid fractions were enriched and much more lipids of liver have been identified by the off-line two dimensional systems than that by only the first dimension.Lipidomics is a rising field and has been concerned by more and more researchers, due to lipid metabolism is one of the three metabolism of human being, and various influencing human health diseases all have a relationship with lipids, such as cancer, diabetes and heart disease. Liquid chromatography is a powerful tool for the separation and analysis of lipids. Although the separation technique is developed constantly, one dimensional chromatography still has not sufficient power to separate the lipids in comprehensive biological samples adequately, neither a reverse phase chromatography, nor a normal phase chromatography. In our study, we developed an off-line two dimensional chromatography method for separation and analysis of lipids from comprehensive biological samples. A diol normal phase column was employed as the first dimension, and a T3 reverse phase column was used as the second dimension. The retention time of the first dimension was stabilized by suitable equilibrium condition, so the lipid fractions were enriched and much more lipids of liver have been identified by the off-line two dimensional systems than that by only the first dimension

CO2 对 La0.6Sr0.4CoO3-δ阴极影响

La0.6Sr0.4CoO3-δ (LSC) perovskite represents one kind of cathode materials for intermediate- and low-temperature cells having high electronic conductivity and high ionic conductivity as well as high catalytic activity for oxygen reduction. The stability of LSC cathode against CO2 in air is an important aspect for practical application. In this work, we investigated the adsorption of CO2 on LSC, reaction of CO2 with LSC and thereof the effect of CO2 on cathode performance.La0.6Sr0.4CoO3-δ (LSC) perovskite represents one kind of cathode materials for intermediate- and low-temperature cells having high electronic conductivity and high ionic conductivity as well as high catalytic activity for oxygen reduction. The stability of LSC cathode against CO2 in air is an important aspect for practical application. In this work, we investigated the adsorption of CO2 on LSC, reaction of CO2 with LSC and thereof the effect of CO2 on cathode performance

Photosynthetic characteristics of M9T337' apple rootstock seedlings and interaction between MdCP2 and MdGLK1 during drought stress

The cysteine protease gene MdCP2 plays an important role in responding to drought stress. In this study, the experimental materials were one-year-old M9T337' apple seedlings subjected to natural drought treatment. We determined the photosynthetic characteristics, plant water content, differentially expressed genes and the function of cysteine protease gene MdCP2 in leaves of apple seedlings during natural drought and rehydration process at physiological and molecular biological levels. The results showed that the photosynthetic rate, stomatal conductance and transpiration rate decreased under drought stress. In the later stage of natural drought, the major limiting factors of photosynthesis changed from stomatal restriction to non-stomatal restriction. The qRT-PCR results showed that MdCP2 had the higher expression level in roots and its expression had a significant positive correlation with the the degree of drought. The expression levels of MdRCA, MdCAB and MdRBCS were negative correlation with the degree of drought. Yeast two-hybrid and BiFC techniques were further used to demonstrate that MdCP2 interacts with MdGLK1. These results provide a theoretical basis for further study of cysteine protease MdCP2 gene

Size Effect and Geometrical Effect of Solids in Micro-Indentation Test

Micro-indentation tests at scales of the order of sub-micron show that the measured hardness increases strongly with decreasing indent depth or indent size, which is frequently referred to as the size effect. At the same time, at micron or sub-micron scale, another effect, which is referred to as the geometrical size effects such as crystal grain size effect, thin film thickness effect, etc., also influences the measured material hardness. However, the trends are at odds with the size-independence implied by the conventional elastic-plastic theory. In the present research, the strain gradient plasticity theory (Fleck and Hutchinson) is used to model the composition effects (size effect and geometrical effect) for polycrystal material and metal thin film/ceramic substrate systems when materials undergo micro-indenting. The phenomena of the "pile-up" and "sink-in" appeared in the indentation test for the polycrystal materials are also discussed. Meanwhile, the micro-indentation experiments for the polycrystal Al and for the Ti/Si_3N_4 thin film/substrate system are carried out. By comparing the theoretical predictions with experimental measurements, the values and the variation trends of the micro-scale parameter included in the strain gradient plasticity theory are predicted

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel