Using carbide slag as the calcareous materials, xonotlite thermal insulation material was successfully prepared via dynamic hydrothermal synthesis. The experimental results show that the xonotlite thermal insulation m...Using carbide slag as the calcareous materials, xonotlite thermal insulation material was successfully prepared via dynamic hydrothermal synthesis. The experimental results show that the xonotlite thermal insulation material is made up of large numbers of ＂chestnut bur shape＂ particles. Optimum conditions of calcination temperature of carbide slag, synthesis reaction temperature and time, stirring rate, CaO/SiO2 mol ratio, water/solid weight ratio, amount of fiberglass, molding pressures, dryness temperatures and the presence of dispersant （glycol and polyvinyl alcohol） favor the preparation of xonotlite thermal insulation material. The evaluation of xonotlite thermal insulation material reveals that the product is ultra-light and excellent in physical performances. Such a little amount of impurities in carbide slag has no effect on the phase, morphology, stability at high temperature and physical performances of products.展开更多
X射线作为一种探测原子尺度物质结构的重要工具,已广泛应用于前沿科学研究、医疗诊断、工业检测等领域。X射线自由电子激光器(X-ray free electron laser,XFEL)作为目前世界上最先进的光源之一,以其超高峰值亮度、飞秒级脉冲和全相干特...X射线作为一种探测原子尺度物质结构的重要工具,已广泛应用于前沿科学研究、医疗诊断、工业检测等领域。X射线自由电子激光器(X-ray free electron laser,XFEL)作为目前世界上最先进的光源之一,以其超高峰值亮度、飞秒级脉冲和全相干特性极大推动了X射线技术的发展与应用。全球众多国家和研究机构正积极推进XFEL设施的建设与技术进步。该文论述了XFEL的基本原理、国际上的研究进展与最新技术突破,以及我国在XFEL技术方面的研究进展,并对我国未来的XFEL技术进行了展望。展开更多
The recent results by the PVLAS group on possible changes of polarization of laser light in a transverse magnetic field are beyond the QED expectations by many orders of magnitude. If confirmed, they may indicate new ...The recent results by the PVLAS group on possible changes of polarization of laser light in a transverse magnetic field are beyond the QED expectations by many orders of magnitude. If confirmed, they may indicate new physics associated with ultra-light particles. I describe here how the polarization of light is modified in an external magnetic field by interactions with a spin-zero particle of no definite parity. While the PVLAS-type experiments cannot tell such a particle from one with definite parity, the parity property could be studied in photon regeneration experiments if the polarization of the regenerated photons could be measured. This talk was based on my recent work.展开更多
基金Funded by the Guizhou Province Technological Breakthroughs Fund(No.20063030)the Guiyang City Technology and Industry Fund(No.200616-9)the Guizhou Science and Technology Founda-tion(No.[2009]2052)
文摘Using carbide slag as the calcareous materials, xonotlite thermal insulation material was successfully prepared via dynamic hydrothermal synthesis. The experimental results show that the xonotlite thermal insulation material is made up of large numbers of ＂chestnut bur shape＂ particles. Optimum conditions of calcination temperature of carbide slag, synthesis reaction temperature and time, stirring rate, CaO/SiO2 mol ratio, water/solid weight ratio, amount of fiberglass, molding pressures, dryness temperatures and the presence of dispersant （glycol and polyvinyl alcohol） favor the preparation of xonotlite thermal insulation material. The evaluation of xonotlite thermal insulation material reveals that the product is ultra-light and excellent in physical performances. Such a little amount of impurities in carbide slag has no effect on the phase, morphology, stability at high temperature and physical performances of products.
文摘X射线作为一种探测原子尺度物质结构的重要工具,已广泛应用于前沿科学研究、医疗诊断、工业检测等领域。X射线自由电子激光器(X-ray free electron laser,XFEL)作为目前世界上最先进的光源之一,以其超高峰值亮度、飞秒级脉冲和全相干特性极大推动了X射线技术的发展与应用。全球众多国家和研究机构正积极推进XFEL设施的建设与技术进步。该文论述了XFEL的基本原理、国际上的研究进展与最新技术突破,以及我国在XFEL技术方面的研究进展,并对我国未来的XFEL技术进行了展望。
基金Supported by NCET (06-0211) Supported by NSFC (10775074)
文摘The recent results by the PVLAS group on possible changes of polarization of laser light in a transverse magnetic field are beyond the QED expectations by many orders of magnitude. If confirmed, they may indicate new physics associated with ultra-light particles. I describe here how the polarization of light is modified in an external magnetic field by interactions with a spin-zero particle of no definite parity. While the PVLAS-type experiments cannot tell such a particle from one with definite parity, the parity property could be studied in photon regeneration experiments if the polarization of the regenerated photons could be measured. This talk was based on my recent work.
