In present work,the volatile constituents of Curcuma longa L.,A.lancea (Thunb.) DC.,Foeniculum vulgare Mill,and Cinnamomun cassia Presl.have been analyzed by flash distillation/capillary gas chro-matography/mass spect...In present work,the volatile constituents of Curcuma longa L.,A.lancea (Thunb.) DC.,Foeniculum vulgare Mill,and Cinnamomun cassia Presl.have been analyzed by flash distillation/capillary gas chro-matography/mass spectrometry.The results are consistent with those obtained by conventional steam distillation extraction method.The optimum condition of flash distillation has been studied.The experimental results showed that this new technique proved to be a simple,rapid and efficient tool for microanalysis of volatile constituents of Chinese medicinal herbs.展开更多
The volatilization of stibnite(Sb2S3) in nitrogen from 700 to 1000 °C was investigated by using thermogravimetric analysis. The results indicate that in inert atmosphere, stibnite can be volatilized most efficien...The volatilization of stibnite(Sb2S3) in nitrogen from 700 to 1000 °C was investigated by using thermogravimetric analysis. The results indicate that in inert atmosphere, stibnite can be volatilized most efficiently as Sb2S3(g) at a linear rate below850 °C, with activation energy of 137.18 k J/mol, and the reaction rate constant can be expressed as k=206901exp(-16.5/T). Stibnite can be decomposed into Sb and sulfur at temperature above 850 °C in a nitrogen atmosphere. However, in the presence of oxygen,stibnite is oxidized into Sb and SO2 gas at high temperature. Otherwise, Sb is oxidized quickly into antimony oxides such as Sb2O3 and Sb O2, while Sb2O3 can be volatilized efficiently at high temperature.展开更多
As the digital landscape continues to evolve,routers have become central gatekeepers,governing the flow of information in networks.This study delves deep into the realm of router forensics,focusing on the methodologie...As the digital landscape continues to evolve,routers have become central gatekeepers,governing the flow of information in networks.This study delves deep into the realm of router forensics,focusing on the methodologies and techniques employed to extract and analyze forensic data from these pivotal devices.Drawing upon both traditional and contemporary approaches,our research underscores the significance of router logs,volatile data,and the challenges that arise in their forensic analysis.We highlight the pressing need for standardized forensic protocols,especially in the face of diverse router architectures and rapidly emerging cyber threats.Our study also emphasizes the potential of leveraging advanced technologies,such as machine learning,in enhancing forensic capabilities.By providing a comprehensive overview of the current state of router forensics and shedding light on potential future trajectories,this research aims to fortify the cybersecurity community's arsenal against escalating cyber threats,ensuring a more secure and resilient digital ecosystem.展开更多
文摘In present work,the volatile constituents of Curcuma longa L.,A.lancea (Thunb.) DC.,Foeniculum vulgare Mill,and Cinnamomun cassia Presl.have been analyzed by flash distillation/capillary gas chro-matography/mass spectrometry.The results are consistent with those obtained by conventional steam distillation extraction method.The optimum condition of flash distillation has been studied.The experimental results showed that this new technique proved to be a simple,rapid and efficient tool for microanalysis of volatile constituents of Chinese medicinal herbs.
基金Project(51204210) supported by the National Natural Science Foundation of ChinaProject(2011AA061001) supported by the National High Technology Research and Development Program of ChinaProject(2012BAC12B04) supported by the National Science&Technology Pillar Program during Twelfth Five-Year Plan of China
文摘The volatilization of stibnite(Sb2S3) in nitrogen from 700 to 1000 °C was investigated by using thermogravimetric analysis. The results indicate that in inert atmosphere, stibnite can be volatilized most efficiently as Sb2S3(g) at a linear rate below850 °C, with activation energy of 137.18 k J/mol, and the reaction rate constant can be expressed as k=206901exp(-16.5/T). Stibnite can be decomposed into Sb and sulfur at temperature above 850 °C in a nitrogen atmosphere. However, in the presence of oxygen,stibnite is oxidized into Sb and SO2 gas at high temperature. Otherwise, Sb is oxidized quickly into antimony oxides such as Sb2O3 and Sb O2, while Sb2O3 can be volatilized efficiently at high temperature.
文摘As the digital landscape continues to evolve,routers have become central gatekeepers,governing the flow of information in networks.This study delves deep into the realm of router forensics,focusing on the methodologies and techniques employed to extract and analyze forensic data from these pivotal devices.Drawing upon both traditional and contemporary approaches,our research underscores the significance of router logs,volatile data,and the challenges that arise in their forensic analysis.We highlight the pressing need for standardized forensic protocols,especially in the face of diverse router architectures and rapidly emerging cyber threats.Our study also emphasizes the potential of leveraging advanced technologies,such as machine learning,in enhancing forensic capabilities.By providing a comprehensive overview of the current state of router forensics and shedding light on potential future trajectories,this research aims to fortify the cybersecurity community's arsenal against escalating cyber threats,ensuring a more secure and resilient digital ecosystem.
