The mass attenuation coefficients(l/q) for different parts(root, flower, stem, and leaf) of three medicinal aromatic plants(Teucrium chamaedrys L. subsp. sinuatum,Rheum ribes, and Chrysophthalmum montanum) were measur...The mass attenuation coefficients(l/q) for different parts(root, flower, stem, and leaf) of three medicinal aromatic plants(Teucrium chamaedrys L. subsp. sinuatum,Rheum ribes, and Chrysophthalmum montanum) were measured using an ^(241)Am photon source in a stable geometry and calculated using the Monte Carlo N-Particle Transport Code System-extended(MCNPX) code and the WinXCOM program. The experimental and theoretical MCNPX and WinXCOM values exhibited good agreement.The measured mass attenuation coefficient values were then used to compute the effective atomic number(Z_(eff))and electron density(N_E) of the samples. The results reveal that S1-S(stem of Teucrium chamaedrys L. subsp. sinuatum) has the highest values of l/q and Zeff.展开更多
In recent years,wind power is experiencing a rapid growth,and large-scale wind turbines/wind farms have been developed and connected to power systems.However,the traditional power system generation units are centraliz...In recent years,wind power is experiencing a rapid growth,and large-scale wind turbines/wind farms have been developed and connected to power systems.However,the traditional power system generation units are centralized located synchronous generators with different characteristics compared with wind turbines.This paper presents an overview of the issues about integrating largescale wind power plants into modern power systems.Firstly,grid codes are introduced.Then,the main technical problems and challenges are presented.Finally,some possible technical solutions are discussed.展开更多
The desert plant Rhazya stricta has anticancer and antimicrobial properties, and is widely used in indigenous medicines of Saudi Arabia. However, the therapeutic benefits rely on an accurate identification of this spe...The desert plant Rhazya stricta has anticancer and antimicrobial properties, and is widely used in indigenous medicines of Saudi Arabia. However, the therapeutic benefits rely on an accurate identification of this species. The authenticity of R. stricta and other medicinal plants and herbs procured from local markets can be questionable due to a lack of clear phenotypic traits. DNA barcoding is an emerging technology for rapid and accurate species identification. In this study, six candidate chloroplastid barcodes were investigated for the authentication of R. stricta. We compared the DNA sequences from fifty locally collected and five market samples of R. stricta with database sequences of R. stricta and seven closely related species. We found that the coding regions matK, rbcL, rpoB, and rpoC1 were highly similar among the taxa. By contrast, the intergenic spacers psbK-psbI and atpF-atpH were variable loci distinct for the medicinal plant R. stricta. psbK-psbI clearly discriminated R. stricta samples as an efficient single locus marker, whereas a two-locus marker combination comprising psbK-psbI + atpF-atpH was also promising according to results from the Basic Local Alignment Search Tool and a maximum likelihood gene tree generated using PHyML. Two-dimensional DNA barcodes (i.e., QR codes) for the psbK-psbI and psbK-psbI + atpF-atpH regions were created for the validation of fresh or dried R. stricta samples.展开更多
燃煤电厂烟气低温余热回收利用研究=The Application Study of Low Temperature Flue Gas Waste Heat Recovery in Power Plant[ 刊,汉 ] LUO Qing （ School of Civil Engineering, Sichuan University of Science ＆ Engi- neering,Si...燃煤电厂烟气低温余热回收利用研究=The Application Study of Low Temperature Flue Gas Waste Heat Recovery in Power Plant[ 刊,汉 ] LUO Qing （ School of Civil Engineering, Sichuan University of Science ＆ Engi- neering,Sichuan, China, Post Code： 643000）//Journal of Engineering for Thermal Energy ＆ Power. -2017,32 （08）. -展开更多
文摘The mass attenuation coefficients(l/q) for different parts(root, flower, stem, and leaf) of three medicinal aromatic plants(Teucrium chamaedrys L. subsp. sinuatum,Rheum ribes, and Chrysophthalmum montanum) were measured using an ^(241)Am photon source in a stable geometry and calculated using the Monte Carlo N-Particle Transport Code System-extended(MCNPX) code and the WinXCOM program. The experimental and theoretical MCNPX and WinXCOM values exhibited good agreement.The measured mass attenuation coefficient values were then used to compute the effective atomic number(Z_(eff))and electron density(N_E) of the samples. The results reveal that S1-S(stem of Teucrium chamaedrys L. subsp. sinuatum) has the highest values of l/q and Zeff.
文摘In recent years,wind power is experiencing a rapid growth,and large-scale wind turbines/wind farms have been developed and connected to power systems.However,the traditional power system generation units are centralized located synchronous generators with different characteristics compared with wind turbines.This paper presents an overview of the issues about integrating largescale wind power plants into modern power systems.Firstly,grid codes are introduced.Then,the main technical problems and challenges are presented.Finally,some possible technical solutions are discussed.
文摘The desert plant Rhazya stricta has anticancer and antimicrobial properties, and is widely used in indigenous medicines of Saudi Arabia. However, the therapeutic benefits rely on an accurate identification of this species. The authenticity of R. stricta and other medicinal plants and herbs procured from local markets can be questionable due to a lack of clear phenotypic traits. DNA barcoding is an emerging technology for rapid and accurate species identification. In this study, six candidate chloroplastid barcodes were investigated for the authentication of R. stricta. We compared the DNA sequences from fifty locally collected and five market samples of R. stricta with database sequences of R. stricta and seven closely related species. We found that the coding regions matK, rbcL, rpoB, and rpoC1 were highly similar among the taxa. By contrast, the intergenic spacers psbK-psbI and atpF-atpH were variable loci distinct for the medicinal plant R. stricta. psbK-psbI clearly discriminated R. stricta samples as an efficient single locus marker, whereas a two-locus marker combination comprising psbK-psbI + atpF-atpH was also promising according to results from the Basic Local Alignment Search Tool and a maximum likelihood gene tree generated using PHyML. Two-dimensional DNA barcodes (i.e., QR codes) for the psbK-psbI and psbK-psbI + atpF-atpH regions were created for the validation of fresh or dried R. stricta samples.
文摘燃煤电厂烟气低温余热回收利用研究=The Application Study of Low Temperature Flue Gas Waste Heat Recovery in Power Plant[ 刊,汉 ] LUO Qing （ School of Civil Engineering, Sichuan University of Science ＆ Engi- neering,Sichuan, China, Post Code： 643000）//Journal of Engineering for Thermal Energy ＆ Power. -2017,32 （08）. -
