This study was conducted to investigate the properties of Pr^(3+)-Dy^(3+)doped Zn_(2)Y-type hexaferrite for potential technological applications.X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR)and ...This study was conducted to investigate the properties of Pr^(3+)-Dy^(3+)doped Zn_(2)Y-type hexaferrite for potential technological applications.X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR)and field-emission scanning electron microscopy(FESEM)were used to analyze structural properties.The crystallite size in the synthesized samples varies between 57.54 and 68.57 nm.The vibrational bands at 400 and 600 cm^(-1),common to all hexaferrites,were confirmed through FTIR.The FESEM analysis reveals an agglomeration of magnetic grains and a decrease in the average grain size from 1.24 to1.06μm.The M-H loops show that,with x values of 0.0,0.1,and 0.2,the saturation magnetization is determined to be 34.76,34.23,and 32.52 emu/g,respectively.The corresponding coercivity values are21.24,30.39,and 33.99 Oe.UV-visible spectroscopy using Tauc theory reveals an increase in the optical band gap from 2.32 to 2.50 eV,indicating a tunable energy band structure by incorporating Pr^(3+)-Dy^(3+)ions.The dielectric constant increases,whereas AC conductivity decreases with increased Pr^(3+)-Dy^(3+)concentration.The obtained results suggest the potential suitability of these materials for various technological applications.展开更多
Different kinds of soil animals and microorganisms inhabit the plant rhizosphere,which function closely to plant roots.Of them,arbuscular mycorrhizal fungi(AMF)and earthworms play a critical role in sustaining the soi...Different kinds of soil animals and microorganisms inhabit the plant rhizosphere,which function closely to plant roots.Of them,arbuscular mycorrhizal fungi(AMF)and earthworms play a critical role in sustaining the soilplant health.Earthworms and AMF belong to the soil community and are soil beneficial organisms at different trophic levels.Both of them improve soil fertility and structural development,collectively promoting plant growth and nutrient acquisition capacity.Earthworm activities redistribute mycorrhizal fungi spores and give diversified effects on root mycorrhizal fungal colonization.Dual inoculation with both earthworms and AMF strongly magnifies the response on plant growth through increased soil enzyme activities and changes in soil nutrient availability,collectively mitigating the negative effects of heavy metal pollution in plants and soils.This thus enhances phytoremediation and plant disease resistance.This review simply outlines the effects of earthworms and AMF on the soil-plant relationship.The effects of earthworms on root AMF colonization and activities are also analyzed.This paper also summarizes the interaction between earthworms and AMF on plants along with suggested future research.展开更多
Zinc oxide （ZnO） thin films were grown on silicon substrate by RF （radio frequency） magnetron sputtering.Surface topography of these films exhibited a nanostructured granular appearance with the size of individual...Zinc oxide （ZnO） thin films were grown on silicon substrate by RF （radio frequency） magnetron sputtering.Surface topography of these films exhibited a nanostructured granular appearance with the size of individual grains between 50 to 100 nm.Corresponding cross-sectional electron micrographs revealed columnar grains in the form of aggregated nanorods/wires with length of about 500 nm,similar to the thickness of these thin films of ZnO nucleated and grown vertically on the silicon substrate.High resolution lattice scale imaging using high resolution transmission electron microscope （HRTEM） elucidated the single crystalline 1010 planes of hexagonal-ZnO constituting the columnar grains with the individual nanorod diameter between 3 and 4 nm.The photoluminescence measurements showed the prominent emission peak at around 460 nm for the blue band,normally attributed to intrinsic defects in particular interstitial zinc （Zn）.These films were further characterized by X-ray diffraction （XRD）,Fourier transform infrared spectroscopy （FTIR）,Raman spectroscopy and electron paramagnetic resonance （EPR） to evaluate various aspects on preferred growth orientations,band structures and vibrational modes originated in such fascinating nano-grained thin films of ZnO.The present investigations inferred that these films are advantageous in various potential applications for fabricating nano-scaled devices.展开更多
We present a study on radiation losses in the microwave X band in Al-Cr substituted Y-type hexaferrites, namely Ba2Mg2Alx/2Crx/2Fe12-xO22 （x = 0, 0.5 and 1.0）. The study is performed by means of a vector network ana...We present a study on radiation losses in the microwave X band in Al-Cr substituted Y-type hexaferrites, namely Ba2Mg2Alx/2Crx/2Fe12-xO22 （x = 0, 0.5 and 1.0）. The study is performed by means of a vector network analyzer, Fourier transform infrared spectroscopy, a vibrating sample magnetometer and x-ray powder diffraction. Ba2Mg2Fe12O22 hexaferrite shows radiation loss of -37.25dB （99.999% loss） at frequency 9.81 GHz, which can be attributed to its high value of saturation magnetization, i.e., 22.08emu/g. Moreover, we obtain that magnetic properties have strong influence on the radiation losses.展开更多
Objective:To perform a simultaneous quantitative estimation of two biologically active triterpenoid compounds lupeol and a steroid compound,stigmasterol,in Abutilon indicum(A.indicum)using high-performance thin-layer ...Objective:To perform a simultaneous quantitative estimation of two biologically active triterpenoid compounds lupeol and a steroid compound,stigmasterol,in Abutilon indicum(A.indicum)using high-performance thin-layer chromatography(HPTLC).Methods:TLC aluminum plates precoated with silica-gel 60 F254(20 cmí10 cm)were used with a mobile phase of toluene-methanol-formic acid(7.0:2.7:0.3,v/v/v)and densitometric determination of these compounds was carried out at 530 nm in reflectance/absorbance mode.Results:Compact bands for lupeol and stigmasterol were obtained at R_(f)0.52±0.02 and 0.28±0.05.The limit of detection(45 and 18 ng/band),limit of quantification(135 and 54 ng/band),recovery(98.2%-99.7%and 97.2%-99.6%)and precision(≤2.18 and 1.91)were satisfactory for lupeol and stigmasterol respectively.Linearity range for lupeol and stigmasterol were 100-1000(r^(2)=0.9994)and 50-500 ng/band(r^(2)=0.9941)and the contents were estimated as(0.59±0.10)%and(0.83±0.10)%w/w respectively.The total phenolic,flavonoid,proanthocyanidin,alkaloidal and saponin contents of methanolic extract of A.indicum were also measured in this work.According to International Conference on Harmonization(ICH)guidelines,the method was validated for linearity,precision,accuracy,and recovery,limit of detection,limit of quantification,specificity,and robustness.Conclusions:The HPTLC method was found to be reproducible,accurate,and precise and could detect these two compounds at nanogram level from the A.indicum.展开更多
基金the Deanship of Scientific Research at King Khalid University for funding this work through large group Research Project under grant number RGP2/226/44。
文摘This study was conducted to investigate the properties of Pr^(3+)-Dy^(3+)doped Zn_(2)Y-type hexaferrite for potential technological applications.X-ray diffraction(XRD),Fourier transform infrared spectroscopy(FTIR)and field-emission scanning electron microscopy(FESEM)were used to analyze structural properties.The crystallite size in the synthesized samples varies between 57.54 and 68.57 nm.The vibrational bands at 400 and 600 cm^(-1),common to all hexaferrites,were confirmed through FTIR.The FESEM analysis reveals an agglomeration of magnetic grains and a decrease in the average grain size from 1.24 to1.06μm.The M-H loops show that,with x values of 0.0,0.1,and 0.2,the saturation magnetization is determined to be 34.76,34.23,and 32.52 emu/g,respectively.The corresponding coercivity values are21.24,30.39,and 33.99 Oe.UV-visible spectroscopy using Tauc theory reveals an increase in the optical band gap from 2.32 to 2.50 eV,indicating a tunable energy band structure by incorporating Pr^(3+)-Dy^(3+)ions.The dielectric constant increases,whereas AC conductivity decreases with increased Pr^(3+)-Dy^(3+)concentration.The obtained results suggest the potential suitability of these materials for various technological applications.
基金This work was supported by the Plan in Scientific and Technological Innovation Team of Outstanding Young Scientists,Hubei Provincial Department of Education(T201604)the Hubei Agricultural Science and Technology Innovation Action Project(Hubei Nongfa[2018]No.1)the UHK Project VT2019-2021.
文摘Different kinds of soil animals and microorganisms inhabit the plant rhizosphere,which function closely to plant roots.Of them,arbuscular mycorrhizal fungi(AMF)and earthworms play a critical role in sustaining the soilplant health.Earthworms and AMF belong to the soil community and are soil beneficial organisms at different trophic levels.Both of them improve soil fertility and structural development,collectively promoting plant growth and nutrient acquisition capacity.Earthworm activities redistribute mycorrhizal fungi spores and give diversified effects on root mycorrhizal fungal colonization.Dual inoculation with both earthworms and AMF strongly magnifies the response on plant growth through increased soil enzyme activities and changes in soil nutrient availability,collectively mitigating the negative effects of heavy metal pollution in plants and soils.This thus enhances phytoremediation and plant disease resistance.This review simply outlines the effects of earthworms and AMF on the soil-plant relationship.The effects of earthworms on root AMF colonization and activities are also analyzed.This paper also summarizes the interaction between earthworms and AMF on plants along with suggested future research.
文摘Zinc oxide （ZnO） thin films were grown on silicon substrate by RF （radio frequency） magnetron sputtering.Surface topography of these films exhibited a nanostructured granular appearance with the size of individual grains between 50 to 100 nm.Corresponding cross-sectional electron micrographs revealed columnar grains in the form of aggregated nanorods/wires with length of about 500 nm,similar to the thickness of these thin films of ZnO nucleated and grown vertically on the silicon substrate.High resolution lattice scale imaging using high resolution transmission electron microscope （HRTEM） elucidated the single crystalline 1010 planes of hexagonal-ZnO constituting the columnar grains with the individual nanorod diameter between 3 and 4 nm.The photoluminescence measurements showed the prominent emission peak at around 460 nm for the blue band,normally attributed to intrinsic defects in particular interstitial zinc （Zn）.These films were further characterized by X-ray diffraction （XRD）,Fourier transform infrared spectroscopy （FTIR）,Raman spectroscopy and electron paramagnetic resonance （EPR） to evaluate various aspects on preferred growth orientations,band structures and vibrational modes originated in such fascinating nano-grained thin films of ZnO.The present investigations inferred that these films are advantageous in various potential applications for fabricating nano-scaled devices.
文摘We present a study on radiation losses in the microwave X band in Al-Cr substituted Y-type hexaferrites, namely Ba2Mg2Alx/2Crx/2Fe12-xO22 （x = 0, 0.5 and 1.0）. The study is performed by means of a vector network analyzer, Fourier transform infrared spectroscopy, a vibrating sample magnetometer and x-ray powder diffraction. Ba2Mg2Fe12O22 hexaferrite shows radiation loss of -37.25dB （99.999% loss） at frequency 9.81 GHz, which can be attributed to its high value of saturation magnetization, i.e., 22.08emu/g. Moreover, we obtain that magnetic properties have strong influence on the radiation losses.
文摘Objective:To perform a simultaneous quantitative estimation of two biologically active triterpenoid compounds lupeol and a steroid compound,stigmasterol,in Abutilon indicum(A.indicum)using high-performance thin-layer chromatography(HPTLC).Methods:TLC aluminum plates precoated with silica-gel 60 F254(20 cmí10 cm)were used with a mobile phase of toluene-methanol-formic acid(7.0:2.7:0.3,v/v/v)and densitometric determination of these compounds was carried out at 530 nm in reflectance/absorbance mode.Results:Compact bands for lupeol and stigmasterol were obtained at R_(f)0.52±0.02 and 0.28±0.05.The limit of detection(45 and 18 ng/band),limit of quantification(135 and 54 ng/band),recovery(98.2%-99.7%and 97.2%-99.6%)and precision(≤2.18 and 1.91)were satisfactory for lupeol and stigmasterol respectively.Linearity range for lupeol and stigmasterol were 100-1000(r^(2)=0.9994)and 50-500 ng/band(r^(2)=0.9941)and the contents were estimated as(0.59±0.10)%and(0.83±0.10)%w/w respectively.The total phenolic,flavonoid,proanthocyanidin,alkaloidal and saponin contents of methanolic extract of A.indicum were also measured in this work.According to International Conference on Harmonization(ICH)guidelines,the method was validated for linearity,precision,accuracy,and recovery,limit of detection,limit of quantification,specificity,and robustness.Conclusions:The HPTLC method was found to be reproducible,accurate,and precise and could detect these two compounds at nanogram level from the A.indicum.
