在复杂自然场景的端到端文本识别中,由于文本和背景难以区分,文本检测的位置信息和识别的语义信息不匹配,无法有效利用检测和识别之间的相关性.针对该问题,本文提出双域感知下多方显式信息协同的自然场景端到端文本识别方法(Multi-party...在复杂自然场景的端到端文本识别中,由于文本和背景难以区分,文本检测的位置信息和识别的语义信息不匹配,无法有效利用检测和识别之间的相关性.针对该问题,本文提出双域感知下多方显式信息协同的自然场景端到端文本识别方法(Multi-party Synergetic explicit Information with Dual-domain Awareness text spotting,MSIDA),通过强化文本区域特征和边缘纹理,利用文本检测和识别特征之间的协同作用提高端到端文本识别性能.首先,设计融合文本空间和方向信息的双域感知模块(Dual-Domain Awareness,DDA),增强文本实例的视觉特征信息;其次,提出多方显式信息协同模块(Multi-party Explicit Information Synergy,MEIS)提取编码特征中的显式信息,通过匹配对齐用于检测和识别的位置、分类和字符多方信息生成候选文本实例;最后,协同特征通过解码器引导可学习的查询序列获得文本检测和识别的结果 .相比最新的DeepSolo(Decoder with explicit points Solo)方法,在Total-Text、ICDAR 2015和CTW1500数据集上,MSIDA模型的准确率分别提升0.8%、0.8%和0.4%.代码和数据集在https://github.com/msida2024/MSIDA.git可以获取.展开更多
Unsaturated alcohols are a class of Biogenic volatile organic compounds(BVOCs)emitted in large quantities by plants when damaged or under adverse environmental conditions,and studies on their atmospheric degradation a...Unsaturated alcohols are a class of Biogenic volatile organic compounds(BVOCs)emitted in large quantities by plants when damaged or under adverse environmental conditions,and studies on their atmospheric degradation at night are still lacking.We used chamber experiments to study the gas-phase reactions of three unsaturated alcohols,E-2-penten-1-ol,Z-2-hexen-1-ol and Z-3-hepten-1-ol,with NO_(3)radicals(NO_(3)•)during the night.The rate constants of these reactions were(11.7±1.76)×10^(−13),(8.55±1.33)×10^(−13)and(6.08±0.47)×10^(−13)cm^(3)/(molecule·s)at 298K and 760 Torr,respectively.In contrast,the reaction rate of similar substances with ozone was about 10^(−18)cm^(3)/(molecule·s),which indicates that the reaction with NO_(3)•is themain oxidation pathway for unsaturated alcohols at night.Small molecule aldehydes and ketones were the main gas-phase organic products of the reaction of three aldehydes and ketones with NO_(3)•,and the total small molecule aldehydes and ketones yields can reach between 45%-60%.They mainly originate from the breakage of alkoxy radicals,and different breakage sites determine different product distributions.In addition,the SOA yields of the three unsaturated alcohols with NO_(3)•were 7.1%±1.0%,12.5%±1.9%and 30.0%±4.5%,respectively,whichweremuch higher than those of similarly structured substances with O_(3)or OH radicals(•OH).The results of high-resolution mass spectrometry shows that the main components of Secondary organic aerosol(SOA)of the three unsaturated alcohols are dimeric compounds containing several nitrate groups,which are formed through the polymerization of oxyalkyl radicals.展开更多
Electrochemical sensors,with their outstanding sensitivity,excellent selectivity,ease of operation,and lower manufacturing costs,have found widespread applications in fields such as disease diagnosis,environmental mon...Electrochemical sensors,with their outstanding sensitivity,excellent selectivity,ease of operation,and lower manufacturing costs,have found widespread applications in fields such as disease diagnosis,environmental monitoring,and food safety.In the development of sensing materials,metal-organic frameworks(MOFs)have become a research hotspot due to their high specific surface area,tunable pore structures,and high designability.Recently,conductive metal-organic frameworks(CMOFs)have brought innovative opportunities to the field of electrochemical sensing,attributing to their remarkable capabilities in catalysis,electron transport,and signal amplification.This review summarizes the significant progress of CMOFs in the field of electrochemical sensing.Firstly,the design and synthesis strategies for CMOFs used in electrochemical sensing are explored,including enhancing the electrochemical properties of MOFs through precise design of different metal nodes and ligands or via post-synthetic modification techniques,covering Cu-based CMOFs,Ni-based CMOFs,Fe-based CMOFs,and CMOF composites.Furthermore,this article elaborately discusses the breakthrough achievements of electrochemical sensors based on CMOFs in applications such as the determination of inorganic ions,detection of organic pollutants,and recognition of gases and biomolecules,and introduces the principles of electrochemical sensing methods and the role of CMOFs in enhancing the performance of electrochemical sensors.Finally,this review analyzes the main challenges currently faced by CMOFs in the field of electrochemical sensors and offers perspectives on their future development.These challenges mainly include stability,selectivity,production costs,and the realization of their large-scale application.CMOFs provide new ideas and material platforms for the development of electrochemical sensors.As researchers deepen their understanding of their properties and technological advances continue,the application prospects of CMOF-based electrochemical sensors will be even broader.展开更多
In order to simultaneously improve the oxidation resistance and the electrical conductivity of solid oxide fuel cell(SOFC)interconnectors,a composite coating of Co–W/NiO was fabricated on ferritic stainless steel by ...In order to simultaneously improve the oxidation resistance and the electrical conductivity of solid oxide fuel cell(SOFC)interconnectors,a composite coating of Co–W/NiO was fabricated on ferritic stainless steel by composite deposition and pre-oxidation.Based on phase identification and microstructural analysis,the novel coating was confirmed to effectively suppress Cr diffusion to form a compact Cr-rich layer.Thus,the oxidation rate has been reduced to 9.46×10−15 g^(2)cm^(−4)s^(−1),which showed a imporvement of 56.4%in oxidation resistance.The area specific resistance value of Co–W/NiO coated steel was evaluated as 27.6 mΩcm^(2),much lower than that of Co–W coating as 53.38 mΩcm^(2),which is adequate for SOFC application.Furthermore,the mechanism of the improvement has been investigated that the addition of NiO led to the formation of Ni–Co spinels and Ni–W composites,which affected the surface microstructure of the coating.Thus,the composite Co–W/NiO coated ferritic stainless steel exhibited the optimal combination for oxidation resistance and electrical conductivity.展开更多
Thick and highly conductive poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate films with ideal porous structure are fulfilling as electrodes for supercapacitors.However,the homogeneous micro-structure without the...Thick and highly conductive poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate films with ideal porous structure are fulfilling as electrodes for supercapacitors.However,the homogeneous micro-structure without the aid of templates or composite presents a significant obstacle,due to the intrinsic softness of the dominant PSS component.In this study,we have successfully developed a porous configuration by employing a solvothermal approach with ethylene glycol(EG)as the solvent.The synergistic action of elevated pressure and temperature was crucial in prompting EG to tailor the microstructure of the PEDOT:PSS films by removing non-conductive PSS chains and improving PEDOT crystallinity,and the formation of a porous network.The resulting porous PEDOT:PSS films exhibited a high conductivity of 1644 S cm^(-1)and achieved a volumetric capacitance record of 270 F cm^(-3),markedly exceeding previous records.The flexible all-solid-state supercapacitor assembled by the films had an outstanding volumetric capacitance of 97.8 F cm^(-3)and an energy density of 8.7 mWh cm^(-3),which is best one for pure PEDOT:PSS-based supercapacitors.Grazing-incidence wide-angle X-ray scattering,X-ray photoelectron spectroscopy,and other characterizations were carried out to characterize the structure evolution.This work offers an effective novel method for conducting polymer morphology control and promotes PEDOT:PSS applications in energy storage field.展开更多
Roots play a critical role in acquisition and utilization of nitrogen in wheat,influencing nitrogen use efficiency(NUE),and ultimately determining yield.However,the detailed responses of root tips to fluctuations in n...Roots play a critical role in acquisition and utilization of nitrogen in wheat,influencing nitrogen use efficiency(NUE),and ultimately determining yield.However,the detailed responses of root tips to fluctuations in nitrogen availability and the underlying regulatory mechanisms enabling adaptation to nitrogenlimited conditions,remain elusive.In this study,we used single-cell nuclear transcriptomics of the highnitrogen utilization variety(HNV)Zhengmai 1860(ZM1860)to construct a comprehensive map of root tip cells under both controlled and nitrogen starvation(N-starv)conditions.Identification of various cell types and their associated genes highlighted the diversity of cellular processes.Using single-nucleus consensus weighted gene co-expression network analysis(hdWGCNA),we identified key modules central to nitrogen metabolism.These identified the prominent role of epidermal cells(EC).The gene TaGS1.2,which is involved in glutamine synthesis,exhibited increased expression under nitrogen-deficient conditions,validating its functional significance in nutrient acquisition.Serving as a key functional gene that adapts to nitrogen-deficient conditions this gene also positively regulated root development.Analysis of the transcriptional regulatory network in EC further revealed the pivotal role of TaG S1.2 in the nitrogen metabolism network.We also uncovered mechanisms that enhance cell-to-cell communication in nitrogen-deficient environments by identifying specific receptors.Single-cell nuclear transcriptome mapping offers valuable insights into the complex responses of root tip cells to nitrogen scarcity and guides future breeding strategies aimed at developing more nitrogen-efficient wheat varieties.展开更多
AIM to investigate the expression of proliferating cell nuclear antigen(p CNA)and E-cadherin in gastric carcinoma and to analyze their clinical significance.METHODS A total of 146 patients were selected for this study...AIM to investigate the expression of proliferating cell nuclear antigen(p CNA)and E-cadherin in gastric carcinoma and to analyze their clinical significance.METHODS A total of 146 patients were selected for this study,including 38 patients with intestinal metaplasia,42with dysplasia,and 66 with primary gastric cancer.In addition,40 patients with normal gastric tissues were selected as controls.the expression of p CNA and E-cadherin was detected by immunohistochemistry.Differences in p CNA and the E-cadherin labeling indexes among normal gastric mucosa,intestinal metaplasia,dysplasia,and gastric carcinoma were compared.Subjects with normal gastric tissues were assigned to a normal group,while gastric cancer patients were assigned to a gastric cancer group.the difference in p CNA and E-cadherin expression between these two groups was compared.the relationship between expression of p CNA and E-cadherin and clinicopathological features was also explored in gastric cancer patients.furthermore,prognosis-related factors,as well as the expression of p CNA and E-cadherin,were analyzed in patients with gastric cancer to determine the 3-year survival of these patients.RESULTS the difference in p CNA and the E-cadherin labeling indexes among normal gastric mucosa,intestinal metaplasia,dysplasia,and gastric carcinoma was statistically significant(p<0.05).During the transition of normal gastric mucosa to gastric cancer,the p CNA labeling index gradually increased,while the E-cadherin labeling index gradually decreased(p<0.05).the p CNA labeling index was significantly higher and the E-cadherin labeling index was significantly lower in gastric cancer than in dysplasia(p<0.05).the expression of p CNA was significantly higher in the gastric cancer group than in the normal group,but E-cadherin was weaker(p<0.05).there was a negative correlation between the expression of p CNA and E-cadherin in gastric carcinoma(r=-0.741,p=0.000).p CNA expression differed significantly between gastric cancer patients with and without lymph node metastasis and between patients at different t stages.E-cadherin expression also differed significantly between gastric cancer patients with and without lymph node metastasis(p<0.05).High t stage and positive p CNA expression were risk factors for the prognosis of patients with gastric cancer(RR>1),while the positive expression of E-cadherin was a protective factor(RR<1).the sensitivity,specificity,and accuracy of p CNA positivity in predicting the 3-year survival of patients with gastric cancer were 93.33%,38.89%,and0.64,respectively;while these values for E-cadherin negativity were 80.0%,41.67%,and 0.59,respectively.When p CNA positivity and E-cadherin negativity were combined,the sensitivity,specificity,and accuracy were66.67%,66.67%,and 0.67,respectively.CONCLUSION Combined detection of p CNA and E-cadherin can improve the accuracy of assessing the prognosis of patients with gastric cancer.展开更多
In this paper, a nonautonomous predator-prey system based on a modified version of the Leslie-Gower scheme and Holling-type II scheme with delayed effect is investigated. The general criteria of integrable form on the...In this paper, a nonautonomous predator-prey system based on a modified version of the Leslie-Gower scheme and Holling-type II scheme with delayed effect is investigated. The general criteria of integrable form on the permanence are established. By constructing suitable Lyapunov functionals, a set of easily verifiable sufficient conditions are derived for global stability of any positive solutions to the展开更多
文摘在复杂自然场景的端到端文本识别中,由于文本和背景难以区分,文本检测的位置信息和识别的语义信息不匹配,无法有效利用检测和识别之间的相关性.针对该问题,本文提出双域感知下多方显式信息协同的自然场景端到端文本识别方法(Multi-party Synergetic explicit Information with Dual-domain Awareness text spotting,MSIDA),通过强化文本区域特征和边缘纹理,利用文本检测和识别特征之间的协同作用提高端到端文本识别性能.首先,设计融合文本空间和方向信息的双域感知模块(Dual-Domain Awareness,DDA),增强文本实例的视觉特征信息;其次,提出多方显式信息协同模块(Multi-party Explicit Information Synergy,MEIS)提取编码特征中的显式信息,通过匹配对齐用于检测和识别的位置、分类和字符多方信息生成候选文本实例;最后,协同特征通过解码器引导可学习的查询序列获得文本检测和识别的结果 .相比最新的DeepSolo(Decoder with explicit points Solo)方法,在Total-Text、ICDAR 2015和CTW1500数据集上,MSIDA模型的准确率分别提升0.8%、0.8%和0.4%.代码和数据集在https://github.com/msida2024/MSIDA.git可以获取.
基金supported by the National Key Research and Development Program of China(No.2020YFA0607800)the National Natural Science Foundation of China(Nos.42022039 and 42130606)Beijing National Laboratory for Molecular Sciences(No.BNLMS-CXXM-202011),the Youth Innovation Promotion Association of Chinese Academy of Sciences(No.Y2021013).
文摘Unsaturated alcohols are a class of Biogenic volatile organic compounds(BVOCs)emitted in large quantities by plants when damaged or under adverse environmental conditions,and studies on their atmospheric degradation at night are still lacking.We used chamber experiments to study the gas-phase reactions of three unsaturated alcohols,E-2-penten-1-ol,Z-2-hexen-1-ol and Z-3-hepten-1-ol,with NO_(3)radicals(NO_(3)•)during the night.The rate constants of these reactions were(11.7±1.76)×10^(−13),(8.55±1.33)×10^(−13)and(6.08±0.47)×10^(−13)cm^(3)/(molecule·s)at 298K and 760 Torr,respectively.In contrast,the reaction rate of similar substances with ozone was about 10^(−18)cm^(3)/(molecule·s),which indicates that the reaction with NO_(3)•is themain oxidation pathway for unsaturated alcohols at night.Small molecule aldehydes and ketones were the main gas-phase organic products of the reaction of three aldehydes and ketones with NO_(3)•,and the total small molecule aldehydes and ketones yields can reach between 45%-60%.They mainly originate from the breakage of alkoxy radicals,and different breakage sites determine different product distributions.In addition,the SOA yields of the three unsaturated alcohols with NO_(3)•were 7.1%±1.0%,12.5%±1.9%and 30.0%±4.5%,respectively,whichweremuch higher than those of similarly structured substances with O_(3)or OH radicals(•OH).The results of high-resolution mass spectrometry shows that the main components of Secondary organic aerosol(SOA)of the three unsaturated alcohols are dimeric compounds containing several nitrate groups,which are formed through the polymerization of oxyalkyl radicals.
基金financially supported by the National Natural Science Foundation of China(Nos.22204089,52201281,and22234006)Natural Science Foundation of Shandong Province(No.ZR2023MB016)。
文摘Electrochemical sensors,with their outstanding sensitivity,excellent selectivity,ease of operation,and lower manufacturing costs,have found widespread applications in fields such as disease diagnosis,environmental monitoring,and food safety.In the development of sensing materials,metal-organic frameworks(MOFs)have become a research hotspot due to their high specific surface area,tunable pore structures,and high designability.Recently,conductive metal-organic frameworks(CMOFs)have brought innovative opportunities to the field of electrochemical sensing,attributing to their remarkable capabilities in catalysis,electron transport,and signal amplification.This review summarizes the significant progress of CMOFs in the field of electrochemical sensing.Firstly,the design and synthesis strategies for CMOFs used in electrochemical sensing are explored,including enhancing the electrochemical properties of MOFs through precise design of different metal nodes and ligands or via post-synthetic modification techniques,covering Cu-based CMOFs,Ni-based CMOFs,Fe-based CMOFs,and CMOF composites.Furthermore,this article elaborately discusses the breakthrough achievements of electrochemical sensors based on CMOFs in applications such as the determination of inorganic ions,detection of organic pollutants,and recognition of gases and biomolecules,and introduces the principles of electrochemical sensing methods and the role of CMOFs in enhancing the performance of electrochemical sensors.Finally,this review analyzes the main challenges currently faced by CMOFs in the field of electrochemical sensors and offers perspectives on their future development.These challenges mainly include stability,selectivity,production costs,and the realization of their large-scale application.CMOFs provide new ideas and material platforms for the development of electrochemical sensors.As researchers deepen their understanding of their properties and technological advances continue,the application prospects of CMOF-based electrochemical sensors will be even broader.
基金supported by Hubei Natural Science Foundation of Hubei(2023AFB111).
文摘In order to simultaneously improve the oxidation resistance and the electrical conductivity of solid oxide fuel cell(SOFC)interconnectors,a composite coating of Co–W/NiO was fabricated on ferritic stainless steel by composite deposition and pre-oxidation.Based on phase identification and microstructural analysis,the novel coating was confirmed to effectively suppress Cr diffusion to form a compact Cr-rich layer.Thus,the oxidation rate has been reduced to 9.46×10−15 g^(2)cm^(−4)s^(−1),which showed a imporvement of 56.4%in oxidation resistance.The area specific resistance value of Co–W/NiO coated steel was evaluated as 27.6 mΩcm^(2),much lower than that of Co–W coating as 53.38 mΩcm^(2),which is adequate for SOFC application.Furthermore,the mechanism of the improvement has been investigated that the addition of NiO led to the formation of Ni–Co spinels and Ni–W composites,which affected the surface microstructure of the coating.Thus,the composite Co–W/NiO coated ferritic stainless steel exhibited the optimal combination for oxidation resistance and electrical conductivity.
基金supported by the National Natural Science Foundation of China(No.51902134)Zhejiang Public Welfare Technology Application Research Program(No.LGJ22B040001)+1 种基金the Innovation Jiaxing Elite Leading Plan 2020,Jiaxing Public Welfare Technology Application Research Program(No.2023AY11051)the Fundamental Research Funds for the Jiaxing University(No.CD70519019,No.CDN70518005,No.CD70623018).
文摘Thick and highly conductive poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate films with ideal porous structure are fulfilling as electrodes for supercapacitors.However,the homogeneous micro-structure without the aid of templates or composite presents a significant obstacle,due to the intrinsic softness of the dominant PSS component.In this study,we have successfully developed a porous configuration by employing a solvothermal approach with ethylene glycol(EG)as the solvent.The synergistic action of elevated pressure and temperature was crucial in prompting EG to tailor the microstructure of the PEDOT:PSS films by removing non-conductive PSS chains and improving PEDOT crystallinity,and the formation of a porous network.The resulting porous PEDOT:PSS films exhibited a high conductivity of 1644 S cm^(-1)and achieved a volumetric capacitance record of 270 F cm^(-3),markedly exceeding previous records.The flexible all-solid-state supercapacitor assembled by the films had an outstanding volumetric capacitance of 97.8 F cm^(-3)and an energy density of 8.7 mWh cm^(-3),which is best one for pure PEDOT:PSS-based supercapacitors.Grazing-incidence wide-angle X-ray scattering,X-ray photoelectron spectroscopy,and other characterizations were carried out to characterize the structure evolution.This work offers an effective novel method for conducting polymer morphology control and promotes PEDOT:PSS applications in energy storage field.
基金supported by the National Key Research and Development Program(2022YFD1200204)the Henan Provincial Science and Technology Research and Development Program Joint Fund(222301420025)the Fund of Shennong Laboratory(SN01-2022-01)。
文摘Roots play a critical role in acquisition and utilization of nitrogen in wheat,influencing nitrogen use efficiency(NUE),and ultimately determining yield.However,the detailed responses of root tips to fluctuations in nitrogen availability and the underlying regulatory mechanisms enabling adaptation to nitrogenlimited conditions,remain elusive.In this study,we used single-cell nuclear transcriptomics of the highnitrogen utilization variety(HNV)Zhengmai 1860(ZM1860)to construct a comprehensive map of root tip cells under both controlled and nitrogen starvation(N-starv)conditions.Identification of various cell types and their associated genes highlighted the diversity of cellular processes.Using single-nucleus consensus weighted gene co-expression network analysis(hdWGCNA),we identified key modules central to nitrogen metabolism.These identified the prominent role of epidermal cells(EC).The gene TaGS1.2,which is involved in glutamine synthesis,exhibited increased expression under nitrogen-deficient conditions,validating its functional significance in nutrient acquisition.Serving as a key functional gene that adapts to nitrogen-deficient conditions this gene also positively regulated root development.Analysis of the transcriptional regulatory network in EC further revealed the pivotal role of TaG S1.2 in the nitrogen metabolism network.We also uncovered mechanisms that enhance cell-to-cell communication in nitrogen-deficient environments by identifying specific receptors.Single-cell nuclear transcriptome mapping offers valuable insights into the complex responses of root tip cells to nitrogen scarcity and guides future breeding strategies aimed at developing more nitrogen-efficient wheat varieties.
基金the National Natural Science foundation of China,No.81360330
文摘AIM to investigate the expression of proliferating cell nuclear antigen(p CNA)and E-cadherin in gastric carcinoma and to analyze their clinical significance.METHODS A total of 146 patients were selected for this study,including 38 patients with intestinal metaplasia,42with dysplasia,and 66 with primary gastric cancer.In addition,40 patients with normal gastric tissues were selected as controls.the expression of p CNA and E-cadherin was detected by immunohistochemistry.Differences in p CNA and the E-cadherin labeling indexes among normal gastric mucosa,intestinal metaplasia,dysplasia,and gastric carcinoma were compared.Subjects with normal gastric tissues were assigned to a normal group,while gastric cancer patients were assigned to a gastric cancer group.the difference in p CNA and E-cadherin expression between these two groups was compared.the relationship between expression of p CNA and E-cadherin and clinicopathological features was also explored in gastric cancer patients.furthermore,prognosis-related factors,as well as the expression of p CNA and E-cadherin,were analyzed in patients with gastric cancer to determine the 3-year survival of these patients.RESULTS the difference in p CNA and the E-cadherin labeling indexes among normal gastric mucosa,intestinal metaplasia,dysplasia,and gastric carcinoma was statistically significant(p<0.05).During the transition of normal gastric mucosa to gastric cancer,the p CNA labeling index gradually increased,while the E-cadherin labeling index gradually decreased(p<0.05).the p CNA labeling index was significantly higher and the E-cadherin labeling index was significantly lower in gastric cancer than in dysplasia(p<0.05).the expression of p CNA was significantly higher in the gastric cancer group than in the normal group,but E-cadherin was weaker(p<0.05).there was a negative correlation between the expression of p CNA and E-cadherin in gastric carcinoma(r=-0.741,p=0.000).p CNA expression differed significantly between gastric cancer patients with and without lymph node metastasis and between patients at different t stages.E-cadherin expression also differed significantly between gastric cancer patients with and without lymph node metastasis(p<0.05).High t stage and positive p CNA expression were risk factors for the prognosis of patients with gastric cancer(RR>1),while the positive expression of E-cadherin was a protective factor(RR<1).the sensitivity,specificity,and accuracy of p CNA positivity in predicting the 3-year survival of patients with gastric cancer were 93.33%,38.89%,and0.64,respectively;while these values for E-cadherin negativity were 80.0%,41.67%,and 0.59,respectively.When p CNA positivity and E-cadherin negativity were combined,the sensitivity,specificity,and accuracy were66.67%,66.67%,and 0.67,respectively.CONCLUSION Combined detection of p CNA and E-cadherin can improve the accuracy of assessing the prognosis of patients with gastric cancer.
文摘In this paper, a nonautonomous predator-prey system based on a modified version of the Leslie-Gower scheme and Holling-type II scheme with delayed effect is investigated. The general criteria of integrable form on the permanence are established. By constructing suitable Lyapunov functionals, a set of easily verifiable sufficient conditions are derived for global stability of any positive solutions to the
