Litter decomposition is an essential ecosystem process influenced by multiple factors,including substrate quality,climate,edaphic environment,and decomposer communities.However,the role of canopy species identity and ...Litter decomposition is an essential ecosystem process influenced by multiple factors,including substrate quality,climate,edaphic environment,and decomposer communities.However,the role of canopy species identity and diversity on leaf litter decomposition in forests remains understudied.By controlling for macroclimate,soil properties,and litter substrate in a mature common garden,we investigated whether a three-month tea bag incubation of standardized green and rooibos tea substrate is driven by canopy tree species characteristics and diversity.Our study hypothesized two primary pathways:a chemical engineering effect,where trees alter soil properties and decomposer communities through litter input,and a physical engineering effect,where tree canopy structure modulates the local microclimate.The results showed that even under uniform macroclimatic and initial soil conditions,mass loss rates varied widely for green tea(27.4%–73.2%)and rooibos tea(6.1%–34.7%),comparable as found in other research between distinct biomes.While substrate quality was the dominant factor,both engineering pathways and,to a minor extent,tree diversity modulated mass losses.For green tea,tree chemical and physical characteristics seemed equally important,while the physical environment showed an increased importance for rooibos.Incubation depth played a key role,where forest floor decomposition rates are more susceptible to temporal climate variations,and soil-layer decomposition rates are less susceptible to climate variations and more determined by tree species identity.Our findings suggest that tea bag experiments focusing solely on topsoil burial may underestimate processes in the forest floor and the mineralorganic boundary layer.This study underscores the critical role of litter substrate quality in decomposition while demonstrating that tree community composition and the associated herbaceous layer,through both chemical and physical engineering pathways,strongly modulate decomposition rates.展开更多
Temperature-programmed desorption(TPD)is a fundamental technique in surface science and heterogeneous catalysis for characterizing adsorption behavior,and for extracting key parameters such as adsorption energy.Howeve...Temperature-programmed desorption(TPD)is a fundamental technique in surface science and heterogeneous catalysis for characterizing adsorption behavior,and for extracting key parameters such as adsorption energy.However,the majority of existing TPD data is accessible in the form of published images,which lacks structured and quantitative datasets.This constrains its utility for rigorous quantitative analysis and computational modelling.Using carbon monoxide(CO)which is a widely adopted probe molecule,a curated and standardized dataset of CO-TPD is constructed,encompassing 14 transition-metal single-crystal surfaces,including copper(Cu)and ruthenium(Ru).By systematically extracting numerical data points from published spectra and applying normalization,essential spectral features such as peak shape are fully preserved.The dataset also documents relevant experimental parameters,including heating rates,and was developed using a standardized protocol for data collection and quality control.This resource serves as both a reference library to support the deconvolution of TPD spectra from complex catalysts and an experimental benchmark for calibrating parameters in theoretical models.By providing a reliable and accessible data function,this work advances the microscopic understanding and the rational design of catalyst active centers.展开更多
Standardization is necessary for the early industrialization of the new materials and technology.It is achieved by having agreed practices for the measurement of properties and other characteristics.The promising use ...Standardization is necessary for the early industrialization of the new materials and technology.It is achieved by having agreed practices for the measurement of properties and other characteristics.The promising use of graphene-based materials in fields like electronics,energy,and composites has resulted in standards for their nomenclature,the measurement of key characteristics,and their specification,etc.Among these,standards for measuring the key characteristics are crucial.The critical parameters are the number of layers,the type and concentration of defects and functional groups,elemental composition,sheet resistance,and carrier mobility.Standards for characterizing these have been analyzed by the International Organization for Standardization Technical Committee in ISO/TC229 and the International Electrotechnical Commission Technical Committee in IEC/TC113.These give details of applicable or preferred samples,the fundamental principles of the techniques,specific precautions,and points for attention in the relevant standards.The pivotal role of the ISO/TC229 and IEC/TC113 standards is considered and challenges and future trends are outlined.展开更多
State Administration for Market Regulation and National Standardization Administration of China have approved the following 3 voluntary national standards.
State Administration for Market Regulation and National Standardization Administration of China have approved the following 354 voluntary national standards as well as 7 voluntary national standards with amendment.
In 2025,prominent achievements have been made in the standardization field of China,from the promulgation of policies on standards work,the development and revision of standards at various levels,to the establishment ...In 2025,prominent achievements have been made in the standardization field of China,from the promulgation of policies on standards work,the development and revision of standards at various levels,to the establishment of the digital platform for standards development.Earlier this year,an online voting was organized by China Standardization Press (CSP) through its WeChat (a popular social media platform in China) official account to select 10 big standardization events of China in 2025.Here,the results are presented to our readers.展开更多
State Administration for Market Regulation and National Standardization Administration of China have approved the following 360 voluntary national standards as well as 9 voluntary national standards with amendment.
State Administration for Market Regulation and National Standardization Administration of China have approved the following 46 mandatory national standards as well as 2 mandatory national standards with amendment.
State Administration for Market Regulation and National Standardization Administration of China have approved the following 25 mandatory national standards as well as 4 mandatory national standards with amendment.
State Administration for Market Regulation and National Standardization Administration of China have approved the following 261 voluntary national standards.
Standardizers keep making theoretical explorations and innovations to advance the standardization process in China.By the end of 2025,the China Standardization Press organized experts to conduct a rigorous review of a...Standardizers keep making theoretical explorations and innovations to advance the standardization process in China.By the end of 2025,the China Standardization Press organized experts to conduct a rigorous review of all articles published on China Standardization (Chinese version) and Standard Science in 2025.The top ten excellent papers were hereby showcased.展开更多
State Administration for Market Regulation and National Standardization Administration of China have approved the following 758 voluntary national standards and 6 voluntary national standards with amendment.
State Administration for Market Regulation and National Standardization Administration of China have approved the following 85 national standards in foreign language version.
The third International Standardization Youth Star Competition is held in Qingdao.We are very pleased to see that 236 teams from renowned domestic universities are actively participating in the competition.ISO has als...The third International Standardization Youth Star Competition is held in Qingdao.We are very pleased to see that 236 teams from renowned domestic universities are actively participating in the competition.ISO has also sent a representative to Qingdao,demonstrating its high level of attention and support for the competition.展开更多
To help university students know more about standards,and attract them to par ticipate in s tandardization ac tivities,the International Standardization Youth Star Competition was initiated by the International Standa...To help university students know more about standards,and attract them to par ticipate in s tandardization ac tivities,the International Standardization Youth Star Competition was initiated by the International Standardization Outstanding Contribution Award Foundation(ISOCAF)in 2023,and has been held since then for three consecutive years in China.The 2025 Competition attracted 236 teams nationwide who demonstrated great enthusiasm for engaging in the standardization undertaking.The SPECIAL REPORT column presents the series reports on the competition,which is expected to inspire more young minds to step forward,innovate with purpose,and shape a future where standards unite ambition with impact.展开更多
State Administration for Market Regulation and National Standardization Administration of China have approved the following 80 national standards in foreign language version.
State Administration for Market Regulation and National Standardization Administration of China have approved the following 76 national standards as guiding technical docoments.
State Administration for Market Regulation and National Standardization Administration of China have approved the following 34 mandatory national standards.
Catalytic decomposition of methane,which produces high-purity hydrogen and high-value-added carbon nanomaterials,has shown considerable potential for development and is expected to yield significant economic benefits ...Catalytic decomposition of methane,which produces high-purity hydrogen and high-value-added carbon nanomaterials,has shown considerable potential for development and is expected to yield significant economic benefits in the future.However,designing catalysts that simultaneously exhibit high activity and long-term stability remains a significant challenge.Tuning the catalyst’s structure and electronic properties is an effective strategy for enhancing the reaction performance.In this work,a series of NixZr/ZSM-5 catalysts were prepared using the incipient wetness impregnation method,and the effect of Zr loadings on catalyst properties and performance was systematically investigated.The calcined and reduced catalysts were characterized by low-temperature N_(2)adsorption-desorption,XRD,SEM,H_(2)-TPR and XPS.The results showed that the addition of Zr significantly increased the specific surface area of the catalyst and reduced the metal particle size.Smaller NiO particles were found to enter the pores of the HZSM-5 support,and electronic interactions between NiO and ZrO_(2)markedly enhanced the metal-support interaction.The catalyst exhibited optimal catalytic performance at a Zr loading of 5%,achieving a maximum methane conversion of 68%at 625℃,maintaining activity for 900 min,and delivering a carbon yield of 1927%.Further increasing the Zr loading yielded only limited improvements in catalytic performance.Characterization of the spent catalysts and carbon products via TEM,Raman spectroscopy,and TGA revealed that the introduction of ZrO_(2)reduced metal sintering and promoted a shift in carbon nanofibers growth mode from tip-growth to base-growth.The mechanism of base-growth enabled the catalyst to maintain reaction activity for an extended period.展开更多
State Administration for Market Regulation and National Standardization Administration of China have approved the following 14 national guiding technical docoments for standardization.
基金funded by the Global PhD Scholarship between KU Leuven and UCLouvain。
文摘Litter decomposition is an essential ecosystem process influenced by multiple factors,including substrate quality,climate,edaphic environment,and decomposer communities.However,the role of canopy species identity and diversity on leaf litter decomposition in forests remains understudied.By controlling for macroclimate,soil properties,and litter substrate in a mature common garden,we investigated whether a three-month tea bag incubation of standardized green and rooibos tea substrate is driven by canopy tree species characteristics and diversity.Our study hypothesized two primary pathways:a chemical engineering effect,where trees alter soil properties and decomposer communities through litter input,and a physical engineering effect,where tree canopy structure modulates the local microclimate.The results showed that even under uniform macroclimatic and initial soil conditions,mass loss rates varied widely for green tea(27.4%–73.2%)and rooibos tea(6.1%–34.7%),comparable as found in other research between distinct biomes.While substrate quality was the dominant factor,both engineering pathways and,to a minor extent,tree diversity modulated mass losses.For green tea,tree chemical and physical characteristics seemed equally important,while the physical environment showed an increased importance for rooibos.Incubation depth played a key role,where forest floor decomposition rates are more susceptible to temporal climate variations,and soil-layer decomposition rates are less susceptible to climate variations and more determined by tree species identity.Our findings suggest that tea bag experiments focusing solely on topsoil burial may underestimate processes in the forest floor and the mineralorganic boundary layer.This study underscores the critical role of litter substrate quality in decomposition while demonstrating that tree community composition and the associated herbaceous layer,through both chemical and physical engineering pathways,strongly modulate decomposition rates.
基金Supported by the Robotic AI-Scientist Platform of Chinese Academy of SciencesNational Natural Science Foundation of China(22372185)+2 种基金Youth Talent Development Program of SKLCC(2025BWZ009)Natural Science Foundation of Shanxi Province(202203021221219)Research on the Construction of Scientific and Technological Innovation Think Tank of Shanxi Association for Science and Technology(KXKT202542)。
文摘Temperature-programmed desorption(TPD)is a fundamental technique in surface science and heterogeneous catalysis for characterizing adsorption behavior,and for extracting key parameters such as adsorption energy.However,the majority of existing TPD data is accessible in the form of published images,which lacks structured and quantitative datasets.This constrains its utility for rigorous quantitative analysis and computational modelling.Using carbon monoxide(CO)which is a widely adopted probe molecule,a curated and standardized dataset of CO-TPD is constructed,encompassing 14 transition-metal single-crystal surfaces,including copper(Cu)and ruthenium(Ru).By systematically extracting numerical data points from published spectra and applying normalization,essential spectral features such as peak shape are fully preserved.The dataset also documents relevant experimental parameters,including heating rates,and was developed using a standardized protocol for data collection and quality control.This resource serves as both a reference library to support the deconvolution of TPD spectra from complex catalysts and an experimental benchmark for calibrating parameters in theoretical models.By providing a reliable and accessible data function,this work advances the microscopic understanding and the rational design of catalyst active centers.
文摘Standardization is necessary for the early industrialization of the new materials and technology.It is achieved by having agreed practices for the measurement of properties and other characteristics.The promising use of graphene-based materials in fields like electronics,energy,and composites has resulted in standards for their nomenclature,the measurement of key characteristics,and their specification,etc.Among these,standards for measuring the key characteristics are crucial.The critical parameters are the number of layers,the type and concentration of defects and functional groups,elemental composition,sheet resistance,and carrier mobility.Standards for characterizing these have been analyzed by the International Organization for Standardization Technical Committee in ISO/TC229 and the International Electrotechnical Commission Technical Committee in IEC/TC113.These give details of applicable or preferred samples,the fundamental principles of the techniques,specific precautions,and points for attention in the relevant standards.The pivotal role of the ISO/TC229 and IEC/TC113 standards is considered and challenges and future trends are outlined.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 3 voluntary national standards.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 354 voluntary national standards as well as 7 voluntary national standards with amendment.
文摘In 2025,prominent achievements have been made in the standardization field of China,from the promulgation of policies on standards work,the development and revision of standards at various levels,to the establishment of the digital platform for standards development.Earlier this year,an online voting was organized by China Standardization Press (CSP) through its WeChat (a popular social media platform in China) official account to select 10 big standardization events of China in 2025.Here,the results are presented to our readers.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 360 voluntary national standards as well as 9 voluntary national standards with amendment.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 46 mandatory national standards as well as 2 mandatory national standards with amendment.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 25 mandatory national standards as well as 4 mandatory national standards with amendment.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 261 voluntary national standards.
文摘Standardizers keep making theoretical explorations and innovations to advance the standardization process in China.By the end of 2025,the China Standardization Press organized experts to conduct a rigorous review of all articles published on China Standardization (Chinese version) and Standard Science in 2025.The top ten excellent papers were hereby showcased.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 758 voluntary national standards and 6 voluntary national standards with amendment.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 85 national standards in foreign language version.
文摘The third International Standardization Youth Star Competition is held in Qingdao.We are very pleased to see that 236 teams from renowned domestic universities are actively participating in the competition.ISO has also sent a representative to Qingdao,demonstrating its high level of attention and support for the competition.
文摘To help university students know more about standards,and attract them to par ticipate in s tandardization ac tivities,the International Standardization Youth Star Competition was initiated by the International Standardization Outstanding Contribution Award Foundation(ISOCAF)in 2023,and has been held since then for three consecutive years in China.The 2025 Competition attracted 236 teams nationwide who demonstrated great enthusiasm for engaging in the standardization undertaking.The SPECIAL REPORT column presents the series reports on the competition,which is expected to inspire more young minds to step forward,innovate with purpose,and shape a future where standards unite ambition with impact.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 80 national standards in foreign language version.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 76 national standards as guiding technical docoments.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 34 mandatory national standards.
基金Supported by Innovative Research Groups of the National Natural Science Foundation of China(22021004)。
文摘Catalytic decomposition of methane,which produces high-purity hydrogen and high-value-added carbon nanomaterials,has shown considerable potential for development and is expected to yield significant economic benefits in the future.However,designing catalysts that simultaneously exhibit high activity and long-term stability remains a significant challenge.Tuning the catalyst’s structure and electronic properties is an effective strategy for enhancing the reaction performance.In this work,a series of NixZr/ZSM-5 catalysts were prepared using the incipient wetness impregnation method,and the effect of Zr loadings on catalyst properties and performance was systematically investigated.The calcined and reduced catalysts were characterized by low-temperature N_(2)adsorption-desorption,XRD,SEM,H_(2)-TPR and XPS.The results showed that the addition of Zr significantly increased the specific surface area of the catalyst and reduced the metal particle size.Smaller NiO particles were found to enter the pores of the HZSM-5 support,and electronic interactions between NiO and ZrO_(2)markedly enhanced the metal-support interaction.The catalyst exhibited optimal catalytic performance at a Zr loading of 5%,achieving a maximum methane conversion of 68%at 625℃,maintaining activity for 900 min,and delivering a carbon yield of 1927%.Further increasing the Zr loading yielded only limited improvements in catalytic performance.Characterization of the spent catalysts and carbon products via TEM,Raman spectroscopy,and TGA revealed that the introduction of ZrO_(2)reduced metal sintering and promoted a shift in carbon nanofibers growth mode from tip-growth to base-growth.The mechanism of base-growth enabled the catalyst to maintain reaction activity for an extended period.
文摘State Administration for Market Regulation and National Standardization Administration of China have approved the following 14 national guiding technical docoments for standardization.
