Microwave(MW)drying method was adopted to enhance the liquid permeability of Scots pine lumber.Structure changes were characterized by stereoscope microscope,scanned electron microscope(SEM)and transmission electron m...Microwave(MW)drying method was adopted to enhance the liquid permeability of Scots pine lumber.Structure changes were characterized by stereoscope microscope,scanned electron microscope(SEM)and transmission electron microscope(TEM)examination.Pore parameters before and after MW treatment were detected by mercury intrusion porosimetry(MIP)method,and the effect of structure changes on liquid permeability were analyzed.As stereoscope microscope,SEM and TEM examination results showed,macro and micro checks mainly developed at intercellcular of tracheids,intercellular of ray parenchyma and tracheid,while these checks extend main along the radial-longitudinal plane.Pit border destruction,aspirated pits’orus translocation and micro-checks in tracheid cell wall were also observed.MIP test shown that pore volume and pore area increased as macro and micro checks generated to form new cavities.Microstructure changes would increase the quantity of pores or enlarge the pore diameter.Liquid flow pathways increased as macro and micro checks generated,aspirated pits reopened to form new pathways;liquid flow efficiency improved as porosity,pore volume and pore diameter increased which facilitated the liquid flow.展开更多
Sorting of desired single cells from a cell population is crucial for many applications in biology and biomedicine that require analysis at the cellular level.Microfluidic dielectrophoresis(DEP)-based single-cell sort...Sorting of desired single cells from a cell population is crucial for many applications in biology and biomedicine that require analysis at the cellular level.Microfluidic dielectrophoresis(DEP)-based single-cell sorting method has been demonstrated as a powerful technology to enable high-throughput and accurate sorting of single cells.However,conventional DEP sorting is mainly performed in the oil phase constrained by solid channels,which restricts the capacity and tunability of the sorting path.Here,we describe an approach to sort single cells on multiple paths in air.Our device allows for tunable ejection of droplets containing single cells in air,which are interrogated and sorted by a microfluidic DEP sorter with a cylindrical electrode,showing a sorting accuracy of>99%for all paths with high survival rates.We demonstrate the utility of our device by isolating multiple subpopulations from a cell sample with three types of cells.Our technology holds the potential to perform sorting on numerous paths,making it applicable for multipurpose sorting from complex heterogeneous cell populations.展开更多
The production of g-C_(3)N_(4) nanostructures with remarkable charge separation efficiency using a one-step, green, and economic approach is of great challenge. Herein, one-dimensional oxidized porous carbon nitride r...The production of g-C_(3)N_(4) nanostructures with remarkable charge separation efficiency using a one-step, green, and economic approach is of great challenge. Herein, one-dimensional oxidized porous carbon nitride rods are successfully fabricated via re-polymerization of de-aromatized melem-containing oligomers that resulted from the hydrothermal treatment of bulk carbon nitride in pure water and resemble the structures of supramolecular complexes networked with hydrogen bonds. The enlarged surface area and increased porosity have been evidenced by transmission electron microscopy and nitrogen sorption, while the enhanced optical properties and suppressed electron–hole recombination process have been confirmed by diffuse reflectance spectrophotometry and steady-state photoluminescence. Exemplification in photocatalytic rhodamine B degradation reveals significantly improved photoactivity, exhibiting 9.2 and 6.4 times higher kinetic rate constants than that of the bulk carbon nitride under white and blue light irradiation, respectively. The proposed nanocasting strategy via de-aromatization of the heptazine network in bulk g-C_(3)N_(4) overcomes the long-standing serious agglomeration for g-C_(3)N_(4) synthesis and improved photocatalytic activity due to the enhanced light capture capacity and promoted electron–hole separation process.展开更多
The growing demand for high-quality,temporally consistent satellite imagery for environmental monitoring and land use research has exposed a substantial data gap in China.Unlike the United States,which provides Analys...The growing demand for high-quality,temporally consistent satellite imagery for environmental monitoring and land use research has exposed a substantial data gap in China.Unlike the United States,which provides Analysis Ready Data(ARD)for Landsat imagery,Chinese researchers currently lack an equivalent resource,resulting in time-intensive data processing and potential research inaccuracies.In this study,we introduce the first seamless,annual Leaf-On Landsat composite data cube for China,covering 1985 to 2023.Leveraging the comprehensive image compositing approach,our dataset harmonizes images across multiple Landsat sensors and addresses key challenges such as cloud and shadow contamination,reflectance consistency,and the data gaps.Over this period,an average of 7.9% of data remained unavailable due to cloud/shadow cover and limited data accessibility.To address this,we applied segmented linear interpolation to generate proxies,which we validated for stability,achieving high consistency with actual Landsat references for both stable and dynamic pixel sequences(r=0.77 to 0.99,root mean square error[RMSE]=0.0043 to 0.0232).Additionally,representativeness assessments indicate a strong correlation between our composites and Landsat reference images(closest to day of year 225)(r=0.75 to 0.94,RMSE=0.025 to 0.063),confirming that these composites effectively capture seasonal vegetation conditions across diverse land cover types.This dataset is expected to help reduce preprocessing efforts for researchers and provide a solid basis for land use monitoring and environmental assessments across China.展开更多
基金supported by Key Research&Development Program of Zhejiang Province(2021C02012)Chinese National Natural Science Foundation,Study on Pore Structure and Liquid Permeate Mechanism of Moso Bamboo(31700489).
文摘Microwave(MW)drying method was adopted to enhance the liquid permeability of Scots pine lumber.Structure changes were characterized by stereoscope microscope,scanned electron microscope(SEM)and transmission electron microscope(TEM)examination.Pore parameters before and after MW treatment were detected by mercury intrusion porosimetry(MIP)method,and the effect of structure changes on liquid permeability were analyzed.As stereoscope microscope,SEM and TEM examination results showed,macro and micro checks mainly developed at intercellcular of tracheids,intercellular of ray parenchyma and tracheid,while these checks extend main along the radial-longitudinal plane.Pit border destruction,aspirated pits’orus translocation and micro-checks in tracheid cell wall were also observed.MIP test shown that pore volume and pore area increased as macro and micro checks generated to form new cavities.Microstructure changes would increase the quantity of pores or enlarge the pore diameter.Liquid flow pathways increased as macro and micro checks generated,aspirated pits reopened to form new pathways;liquid flow efficiency improved as porosity,pore volume and pore diameter increased which facilitated the liquid flow.
基金supported by the National Natural Science Foundation of China(Grant no.52475584,52205296)National Key R&D Program of China(Grant no.2025YFC3408703)Aeronautical Science Foundation of China(Grant Number 2023Z056051001).
文摘Sorting of desired single cells from a cell population is crucial for many applications in biology and biomedicine that require analysis at the cellular level.Microfluidic dielectrophoresis(DEP)-based single-cell sorting method has been demonstrated as a powerful technology to enable high-throughput and accurate sorting of single cells.However,conventional DEP sorting is mainly performed in the oil phase constrained by solid channels,which restricts the capacity and tunability of the sorting path.Here,we describe an approach to sort single cells on multiple paths in air.Our device allows for tunable ejection of droplets containing single cells in air,which are interrogated and sorted by a microfluidic DEP sorter with a cylindrical electrode,showing a sorting accuracy of>99%for all paths with high survival rates.We demonstrate the utility of our device by isolating multiple subpopulations from a cell sample with three types of cells.Our technology holds the potential to perform sorting on numerous paths,making it applicable for multipurpose sorting from complex heterogeneous cell populations.
基金supported by the Natural Science Foundation of Jiangsu Province(BK20210608)the Natural Science Foundation of Jiangsu Higher Education Institutions of China(21KJA150003)。
文摘The production of g-C_(3)N_(4) nanostructures with remarkable charge separation efficiency using a one-step, green, and economic approach is of great challenge. Herein, one-dimensional oxidized porous carbon nitride rods are successfully fabricated via re-polymerization of de-aromatized melem-containing oligomers that resulted from the hydrothermal treatment of bulk carbon nitride in pure water and resemble the structures of supramolecular complexes networked with hydrogen bonds. The enlarged surface area and increased porosity have been evidenced by transmission electron microscopy and nitrogen sorption, while the enhanced optical properties and suppressed electron–hole recombination process have been confirmed by diffuse reflectance spectrophotometry and steady-state photoluminescence. Exemplification in photocatalytic rhodamine B degradation reveals significantly improved photoactivity, exhibiting 9.2 and 6.4 times higher kinetic rate constants than that of the bulk carbon nitride under white and blue light irradiation, respectively. The proposed nanocasting strategy via de-aromatization of the heptazine network in bulk g-C_(3)N_(4) overcomes the long-standing serious agglomeration for g-C_(3)N_(4) synthesis and improved photocatalytic activity due to the enhanced light capture capacity and promoted electron–hole separation process.
基金supported in part by the National Science Foundation for Distinguished Young Scholars of China under Grant 42225107the National Key Research and Development Program of China under Grant 2022YFB3903402the National Natural Science Foundation of China under Grant 42171409 and Grant 42171410.
文摘The growing demand for high-quality,temporally consistent satellite imagery for environmental monitoring and land use research has exposed a substantial data gap in China.Unlike the United States,which provides Analysis Ready Data(ARD)for Landsat imagery,Chinese researchers currently lack an equivalent resource,resulting in time-intensive data processing and potential research inaccuracies.In this study,we introduce the first seamless,annual Leaf-On Landsat composite data cube for China,covering 1985 to 2023.Leveraging the comprehensive image compositing approach,our dataset harmonizes images across multiple Landsat sensors and addresses key challenges such as cloud and shadow contamination,reflectance consistency,and the data gaps.Over this period,an average of 7.9% of data remained unavailable due to cloud/shadow cover and limited data accessibility.To address this,we applied segmented linear interpolation to generate proxies,which we validated for stability,achieving high consistency with actual Landsat references for both stable and dynamic pixel sequences(r=0.77 to 0.99,root mean square error[RMSE]=0.0043 to 0.0232).Additionally,representativeness assessments indicate a strong correlation between our composites and Landsat reference images(closest to day of year 225)(r=0.75 to 0.94,RMSE=0.025 to 0.063),confirming that these composites effectively capture seasonal vegetation conditions across diverse land cover types.This dataset is expected to help reduce preprocessing efforts for researchers and provide a solid basis for land use monitoring and environmental assessments across China.
