The phenomenon of'bamboo-like'thin interlayers developed in rock salt is one of the most prominent features of Paleogene salt-bearing strata in eastern China,where centimeter-thick rock salts appear separately...The phenomenon of'bamboo-like'thin interlayers developed in rock salt is one of the most prominent features of Paleogene salt-bearing strata in eastern China,where centimeter-thick rock salts appear separately,forming rhythmic units.At present,detailed analyses of these rhythms of rock salt are still limited,which directly affects the achievement of comprehensive and in-depth understanding of the developmental laws pertaining to this kind of saline lake.Therefore,we selected the typical rhythmic'bamboo-like'rock salts of the Shizhai Depression in Jiangsu Province as the research subject.Through careful observation of rock salts in hand samples and detailed petrographic and mineralogical analyses,we analyzed the hydrogen and oxygen isotopic compositions,homogenization temperatures and chemical compositions of individual fluid inclusions in halite crystals.Early-stage rhythmic deposition was a product of continental saline lake evolution in winter or spring,late-stage rhythmic deposition being the product of evolution in the summer.The seasonal evolution of the halite sequences was determined and two brine enrichment events were identified.In addition,the quiet saline lake environment with concentrated brine represented by rock salt was more likely to precipitate potassium.This study provides a new reference for the evolution of both Paleogene climate and saline lakes in eastern China.展开更多
The influence of the selection of receiving slits and the use of standard samples with random orientation on the result of quantitative texture analysis was tested and discussed. The result proves that it will improve...The influence of the selection of receiving slits and the use of standard samples with random orientation on the result of quantitative texture analysis was tested and discussed. The result proves that it will improve the precision of the analysis to use proper slits and a randomly oriented standard sample. A simple method was given to interpolate the correction curves of random intensities.展开更多
A reliable high performance liquid chromatography method was developed for the quality evaluation of Polygonum aviculare L. Eight marker flavonoids were identified and simultaneously quantified, which included myricit...A reliable high performance liquid chromatography method was developed for the quality evaluation of Polygonum aviculare L. Eight marker flavonoids were identified and simultaneously quantified, which included myricitrin, hyperoside, galuteolin, avicularin, quercitrin, quercetin, luteolin, and kaempferol. The analysis was performed on an Inertsil ODS-4 column（4.6 mm×150 mm, 5 μm） with gradient elution. The mobile phases were 0.5% aqueous phosphoric acid and acetonitrile. The detection wavelength was 360 nm. The eight marker flavonoids were separated well with good linearity（r20.9991）, precision, stability and repeatability. The recovery rate was 95.58%–102.65%. Cluster analysis was employed to analyze 28 batches of samples. The result indicated that this method provides an efficient way to perform quality control as well as a scientific rationale for the Geo-authentication of Polygonum aviculare L.展开更多
Mode-localized sensors have attracted significant attention due to their exceptional sensitivity and inherent ability to reject common-mode noise.This high sensitivity arises from the substantial shifts in resonator a...Mode-localized sensors have attracted significant attention due to their exceptional sensitivity and inherent ability to reject common-mode noise.This high sensitivity arises from the substantial shifts in resonator amplitudes induced by energy confinement in weakly coupled resonators.Despite their promising attributes,there has been limited research on the mechanisms of energy confinement.This paper presents both qualitative and quantitative analyses of energy confinement within weakly coupled resonators and concludes them as the concept of modal dominance.This concept elucidates that mode frequencies are predominantly dictated by the natural frequencies of the internal resonators,facilitating spatial energy confinement.Based on this modal dominance,a novel concept of virtually coupled resonators is proposed,which obviates the need for physical coupling structures.Instead,energy confinement is achieved through a frequency offset between two independent resonators,resulting in a similar amplitude ratio output and enhanced sensitivity.To further enhance performance,a double-closed-loop control scheme is developed for virtually coupled resonators,expanding the bandwidth in comparison to weakly coupled resonators.Experimental results validate the feasibility of virtually coupled resonators and the double-closed-loop control,demonstrating a 2.7-fold improvement in amplitude ratio sensitivity and at least a four-fold enhancement in bandwidth relative to weakly coupled resonators with identical parameters.展开更多
基金supported by the Natural Science Foundation of Jiangxi Province,China(Grant No.20242BAB20130)the Basic Research Funds Program of the Chinese Academy of Geological Sciences(Grant No.YYWF201607)the National Natural Science Foundation of China(Grant No.41902064)。
文摘The phenomenon of'bamboo-like'thin interlayers developed in rock salt is one of the most prominent features of Paleogene salt-bearing strata in eastern China,where centimeter-thick rock salts appear separately,forming rhythmic units.At present,detailed analyses of these rhythms of rock salt are still limited,which directly affects the achievement of comprehensive and in-depth understanding of the developmental laws pertaining to this kind of saline lake.Therefore,we selected the typical rhythmic'bamboo-like'rock salts of the Shizhai Depression in Jiangsu Province as the research subject.Through careful observation of rock salts in hand samples and detailed petrographic and mineralogical analyses,we analyzed the hydrogen and oxygen isotopic compositions,homogenization temperatures and chemical compositions of individual fluid inclusions in halite crystals.Early-stage rhythmic deposition was a product of continental saline lake evolution in winter or spring,late-stage rhythmic deposition being the product of evolution in the summer.The seasonal evolution of the halite sequences was determined and two brine enrichment events were identified.In addition,the quiet saline lake environment with concentrated brine represented by rock salt was more likely to precipitate potassium.This study provides a new reference for the evolution of both Paleogene climate and saline lakes in eastern China.
文摘The influence of the selection of receiving slits and the use of standard samples with random orientation on the result of quantitative texture analysis was tested and discussed. The result proves that it will improve the precision of the analysis to use proper slits and a randomly oriented standard sample. A simple method was given to interpolate the correction curves of random intensities.
基金Study of Nature of Geo-authentic Crude Drug("9 73"State Key Project,Grant No.2006CB504700)
文摘A reliable high performance liquid chromatography method was developed for the quality evaluation of Polygonum aviculare L. Eight marker flavonoids were identified and simultaneously quantified, which included myricitrin, hyperoside, galuteolin, avicularin, quercitrin, quercetin, luteolin, and kaempferol. The analysis was performed on an Inertsil ODS-4 column（4.6 mm×150 mm, 5 μm） with gradient elution. The mobile phases were 0.5% aqueous phosphoric acid and acetonitrile. The detection wavelength was 360 nm. The eight marker flavonoids were separated well with good linearity（r20.9991）, precision, stability and repeatability. The recovery rate was 95.58%–102.65%. Cluster analysis was employed to analyze 28 batches of samples. The result indicated that this method provides an efficient way to perform quality control as well as a scientific rationale for the Geo-authentication of Polygonum aviculare L.
基金supported by the National Science Foundation of China(No.52435012 and No.52475606)the National Key Research and Development Program of China(No.2023YFB3208800)+2 种基金Innovation Capability Support Program of Shaanxi(No.2024RS-CXTD-7)the Key Research and Development Program of Shaanxi Province(2024GX-YBXM-193)the Fundamental Research Funds for the Central Universities.
文摘Mode-localized sensors have attracted significant attention due to their exceptional sensitivity and inherent ability to reject common-mode noise.This high sensitivity arises from the substantial shifts in resonator amplitudes induced by energy confinement in weakly coupled resonators.Despite their promising attributes,there has been limited research on the mechanisms of energy confinement.This paper presents both qualitative and quantitative analyses of energy confinement within weakly coupled resonators and concludes them as the concept of modal dominance.This concept elucidates that mode frequencies are predominantly dictated by the natural frequencies of the internal resonators,facilitating spatial energy confinement.Based on this modal dominance,a novel concept of virtually coupled resonators is proposed,which obviates the need for physical coupling structures.Instead,energy confinement is achieved through a frequency offset between two independent resonators,resulting in a similar amplitude ratio output and enhanced sensitivity.To further enhance performance,a double-closed-loop control scheme is developed for virtually coupled resonators,expanding the bandwidth in comparison to weakly coupled resonators.Experimental results validate the feasibility of virtually coupled resonators and the double-closed-loop control,demonstrating a 2.7-fold improvement in amplitude ratio sensitivity and at least a four-fold enhancement in bandwidth relative to weakly coupled resonators with identical parameters.
