Human milk fat （HMF） is the component that supplies the highest fraction of the infant＇s required dietary energy. Other sources of fat are necessary and crucial for infants while the breastfeeding is not possible, ...Human milk fat （HMF） is the component that supplies the highest fraction of the infant＇s required dietary energy. Other sources of fat are necessary and crucial for infants while the breastfeeding is not possible, desirable or sufficient. There is enough scientific evidence that suggests the composition and distribution of the fatty acids affect the absorption of the fat in infants greatly, which influences the growth and health of infants. However, the composition and distribution of the fatty acids in certain fat such as cow milk fat or vegetable oil are different from those in human milk. So as to mimic human milk fat composition and structure, a series of human milk fat substitutes （HMFS） have been developed through enzymatic interesterification reaction during recent years This review described current trends in the production of HMFS, discussed the significance and methods of preparing HMFS and the problems and put forward potential solutions about this kind of product.展开更多
This study presents a novel offshore expandable HMFS system that integrates the functions of a floating breakwater and wave energy converters(WECs),offering an alternative approach to marine space development.A scaled...This study presents a novel offshore expandable HMFS system that integrates the functions of a floating breakwater and wave energy converters(WECs),offering an alternative approach to marine space development.A scaled experimental model was developed,consisting of hybrid functional modules,inter-module connectors,a mooring system,and integrated WEC units.The design incorporates WECs driven by parallel-axis gears and hinge connectors with linear torsional stiffness.The research experimentally examines the effects of connector stiffness,longitudinal spatial expansion,and mooring line fracture on key dynamic responses.The findings demonstrate that enhanced connector stiffness reduces module motion responses while increasing connector loads,providing experimental guidance for connector selection.The hinge-connected system demonstrates stable dynamic performance,while the rigid-connected system exhibits significant increases in pitch bending moment during longitudinal spatial expansion.Analysis of single mooring line fracture suggests avoiding systems with minimal mooring lines to prevent excessive planar displacement.These findings provide valuable experimental insights for the engineering implementation of the HMFS system.展开更多
The electrochemical oxidation of biomass-derived platform molecule 5-hydroxymethylfurfural(HMF)represents a crucial pathway for green transformation into high-value chemicals,yet its reaction pathway selectivity,effic...The electrochemical oxidation of biomass-derived platform molecule 5-hydroxymethylfurfural(HMF)represents a crucial pathway for green transformation into high-value chemicals,yet its reaction pathway selectivity,efficiency,and catalyst stability are strongly dependent on the electrolyte pH environment.Under alkaline conditions,high OH−concentration facilitates preferential aldehyde group oxidation and efficient deprotonation,enabling highly efficient synthesis of 2,5-furandicarboxylic acid,but simultaneously induces HMF self-degradation and complicates product separation.As pH decreases,the reaction mechanism shifts toward enhanced hydroxymethyl oxidation,leading to intermediate accumulation(such as 5-hydroxymethyl-2-furancarboxylic acid,2,5-diformylfuran,and 5-formyl-2-furancarboxylic acid)with challenging selectivity control and significantly slowed reaction kinetics.This review comprehensively examines the systematic differences in HMF oxidation pathways and surface catalytic mechanisms across the full pH range from alkaline to acidic conditions.Addressing the distinct reaction characteristics and core challenges in alkaline,near-neutral,and acidic media,we systematically evaluate design strategies for high-efficiency electrocatalysts and explore reactor design aspects.Future research should focus on process integration(with tailored reactor design)for energy consumption reduction in alkaline systems,targeted synthesis of diverse oxidation products in near-neutral systems,and innovative catalyst development for acidic systems,thereby advancing the efficiency,selectivity,and practical application of HMF electrooxidation technologies across the entire pH spectrum through synergistic optimization of catalyst,reactor,and process.展开更多
Solar biomass conversion has garnered significant research attention,but the rapid recombination of electrons and holes in photocatalysts hinders efficiency.To enhance this process,researchers aim to develop S-scheme ...Solar biomass conversion has garnered significant research attention,but the rapid recombination of electrons and holes in photocatalysts hinders efficiency.To enhance this process,researchers aim to develop S-scheme heterojunction photocatalysts with optimized band structures that enable effective electron-hole separation,thereby improving overall efficiency.Herein,chemical-bonded SnIn_(4)S_(8)/WO_(3)S-scheme heterostructure photocatalyst was constructed via in-situ hydrothermal strategy for sunlight-driven catalytic selective oxidization of 5-hydroxymethylfurrural(HMF)into valuable 2,5-dimethylfuran(DFF).X-ray photoelectron spectroscopy(XPS)results prove the formation of a W-S chemical bond in the composites,which will likely enhance the efficient transport of photogenerated charges.The optimal SnIn_(4)S_(8)/WO_(3)exhibited an excellent HMF conversion rate(89%)and DFF yield(68%)after 2 h.The S-scheme charge transfer pathway in the SnIn_(4)S_(8)/WO_(3)composite structure was verified through density functional theory(DFT)calculations and supported by partial in situ experimental results.This study demonstrates that the S-scheme heterostructure based on SnIn_(4)S_(8)offers innovative insights for advancing photocatalytic biomass conversion.展开更多
The integration of selective oxidation of renewable biomass and its derivatives with hydrogen(H_(2))pro-duction holds significant potential for simultaneously yielding value-added chemicals and“green H_(2)”,contribu...The integration of selective oxidation of renewable biomass and its derivatives with hydrogen(H_(2))pro-duction holds significant potential for simultaneously yielding value-added chemicals and“green H_(2)”,contributing to addressing sustainability challenges.The S-scheme charge transfer mechanism enhances charge separation by maintaining strong redox potentials at both ends,facilitating both oxidation and reduction reactions.Herein,we synthesize a visible-light-responsive oxygen vacancy-rich In_(2)O_(3-x)/tubular carbon nitride(IO_(OV)/TCN)S-scheme heterojunction photocatalyst via electrostatic adherence for selec-tive 5-hydroxymethylfurfural(HMF)oxidation to 2,5-diformylfuran(DFF)and 2,5-furandicarboxylic acid(FDCA),alongside H_(2)production.Under anaerobic conditions and visible-light irradiation,the optimal IOOV/TCN-10 catalyst achieves an HMF conversion of 94.8%with a selectivity of 53.6%for DFF and FDCA,and a H_(2)yield of 754.05μmol g^(−1)in 3 h.The significantly improved photocatalytic activity results from enhanced visible-light absorption,reduced carrier recombination,and abundant catalytic active sites due to the synergistic effect of surface oxygen vacancies,the hollow nanotube-based architecture,and the S-scheme charge transfer mechanism.This work highlights the great potentials of S-scheme heterojunctions in biomass conversion for sustainable energy use and chemical production.展开更多
以某1000 MW机组为研究对象,通过对机组历史日负荷数据进行聚类分析,得到机组负荷的相似性特征。然后提出了一种适用于火电机组负荷预测的历史匹配预测算法(History matching and forecasting algorithm,HMF),HMF算法将预测时间点之前...以某1000 MW机组为研究对象,通过对机组历史日负荷数据进行聚类分析,得到机组负荷的相似性特征。然后提出了一种适用于火电机组负荷预测的历史匹配预测算法(History matching and forecasting algorithm,HMF),HMF算法将预测时间点之前几个小时的负荷序列与同时段的历史负荷数据进行相似性匹配,利用最相似日的负荷变化趋势对未来负荷做出预测。算例测试表明:HMF算法未来3 h的负荷预测平均误差为4.412%,比传统的自回归滑动平均模型(Autoregressive moving average model,ARMA)具有更高的预测精度,且在变负荷过程中也能取得较好的预测效果。展开更多
基金Supported by Innovative Team of Developmental Science and Technology of Bio-dairy Products,Northeast AgriculturalUninversity (CXT007)
文摘Human milk fat （HMF） is the component that supplies the highest fraction of the infant＇s required dietary energy. Other sources of fat are necessary and crucial for infants while the breastfeeding is not possible, desirable or sufficient. There is enough scientific evidence that suggests the composition and distribution of the fatty acids affect the absorption of the fat in infants greatly, which influences the growth and health of infants. However, the composition and distribution of the fatty acids in certain fat such as cow milk fat or vegetable oil are different from those in human milk. So as to mimic human milk fat composition and structure, a series of human milk fat substitutes （HMFS） have been developed through enzymatic interesterification reaction during recent years This review described current trends in the production of HMFS, discussed the significance and methods of preparing HMFS and the problems and put forward potential solutions about this kind of product.
基金financially supported by the National Natural Science Foundation of China(Grant No.52161041)the Natural Science Foundation of Hainan Province(Grant No.520RC552)the Science,Technology and Innovation Commission of Shenzhen Municipality(Grant No.KQTD2021081109112003).
文摘This study presents a novel offshore expandable HMFS system that integrates the functions of a floating breakwater and wave energy converters(WECs),offering an alternative approach to marine space development.A scaled experimental model was developed,consisting of hybrid functional modules,inter-module connectors,a mooring system,and integrated WEC units.The design incorporates WECs driven by parallel-axis gears and hinge connectors with linear torsional stiffness.The research experimentally examines the effects of connector stiffness,longitudinal spatial expansion,and mooring line fracture on key dynamic responses.The findings demonstrate that enhanced connector stiffness reduces module motion responses while increasing connector loads,providing experimental guidance for connector selection.The hinge-connected system demonstrates stable dynamic performance,while the rigid-connected system exhibits significant increases in pitch bending moment during longitudinal spatial expansion.Analysis of single mooring line fracture suggests avoiding systems with minimal mooring lines to prevent excessive planar displacement.These findings provide valuable experimental insights for the engineering implementation of the HMFS system.
基金supported by the National Key R&D Program of China(2023YFA1507400)the National Natural Science Foundation of China(Grant No.22325805,22441010,22408203)+2 种基金Beijing Natural Science Foundation(Grant No.JQ22003)the Haihe Laboratory of Sustainable Chemical Transformations(24HHWCSS00007)Tsinghua University Dushi Program,and Sinopec Group(PR20232572).
文摘The electrochemical oxidation of biomass-derived platform molecule 5-hydroxymethylfurfural(HMF)represents a crucial pathway for green transformation into high-value chemicals,yet its reaction pathway selectivity,efficiency,and catalyst stability are strongly dependent on the electrolyte pH environment.Under alkaline conditions,high OH−concentration facilitates preferential aldehyde group oxidation and efficient deprotonation,enabling highly efficient synthesis of 2,5-furandicarboxylic acid,but simultaneously induces HMF self-degradation and complicates product separation.As pH decreases,the reaction mechanism shifts toward enhanced hydroxymethyl oxidation,leading to intermediate accumulation(such as 5-hydroxymethyl-2-furancarboxylic acid,2,5-diformylfuran,and 5-formyl-2-furancarboxylic acid)with challenging selectivity control and significantly slowed reaction kinetics.This review comprehensively examines the systematic differences in HMF oxidation pathways and surface catalytic mechanisms across the full pH range from alkaline to acidic conditions.Addressing the distinct reaction characteristics and core challenges in alkaline,near-neutral,and acidic media,we systematically evaluate design strategies for high-efficiency electrocatalysts and explore reactor design aspects.Future research should focus on process integration(with tailored reactor design)for energy consumption reduction in alkaline systems,targeted synthesis of diverse oxidation products in near-neutral systems,and innovative catalyst development for acidic systems,thereby advancing the efficiency,selectivity,and practical application of HMF electrooxidation technologies across the entire pH spectrum through synergistic optimization of catalyst,reactor,and process.
基金the Canada First Research Excellence Fund(CFREF)Natural Sciences and Engineering Research Council of Canada-Discovery Grant(10040079)for their fundingthe financial support from the China Scholarship Council。
文摘Solar biomass conversion has garnered significant research attention,but the rapid recombination of electrons and holes in photocatalysts hinders efficiency.To enhance this process,researchers aim to develop S-scheme heterojunction photocatalysts with optimized band structures that enable effective electron-hole separation,thereby improving overall efficiency.Herein,chemical-bonded SnIn_(4)S_(8)/WO_(3)S-scheme heterostructure photocatalyst was constructed via in-situ hydrothermal strategy for sunlight-driven catalytic selective oxidization of 5-hydroxymethylfurrural(HMF)into valuable 2,5-dimethylfuran(DFF).X-ray photoelectron spectroscopy(XPS)results prove the formation of a W-S chemical bond in the composites,which will likely enhance the efficient transport of photogenerated charges.The optimal SnIn_(4)S_(8)/WO_(3)exhibited an excellent HMF conversion rate(89%)and DFF yield(68%)after 2 h.The S-scheme charge transfer pathway in the SnIn_(4)S_(8)/WO_(3)composite structure was verified through density functional theory(DFT)calculations and supported by partial in situ experimental results.This study demonstrates that the S-scheme heterostructure based on SnIn_(4)S_(8)offers innovative insights for advancing photocatalytic biomass conversion.
基金financially supported by the Natural Science Foundation of China(Nos.21972058,22102064,and 22302080)Anhui Key Laboratory of Nanomaterials and Nanotechnology,the Major Science and Technology Projects in Anhui Province(No.202305a12020006).
文摘The integration of selective oxidation of renewable biomass and its derivatives with hydrogen(H_(2))pro-duction holds significant potential for simultaneously yielding value-added chemicals and“green H_(2)”,contributing to addressing sustainability challenges.The S-scheme charge transfer mechanism enhances charge separation by maintaining strong redox potentials at both ends,facilitating both oxidation and reduction reactions.Herein,we synthesize a visible-light-responsive oxygen vacancy-rich In_(2)O_(3-x)/tubular carbon nitride(IO_(OV)/TCN)S-scheme heterojunction photocatalyst via electrostatic adherence for selec-tive 5-hydroxymethylfurfural(HMF)oxidation to 2,5-diformylfuran(DFF)and 2,5-furandicarboxylic acid(FDCA),alongside H_(2)production.Under anaerobic conditions and visible-light irradiation,the optimal IOOV/TCN-10 catalyst achieves an HMF conversion of 94.8%with a selectivity of 53.6%for DFF and FDCA,and a H_(2)yield of 754.05μmol g^(−1)in 3 h.The significantly improved photocatalytic activity results from enhanced visible-light absorption,reduced carrier recombination,and abundant catalytic active sites due to the synergistic effect of surface oxygen vacancies,the hollow nanotube-based architecture,and the S-scheme charge transfer mechanism.This work highlights the great potentials of S-scheme heterojunctions in biomass conversion for sustainable energy use and chemical production.
文摘以某1000 MW机组为研究对象,通过对机组历史日负荷数据进行聚类分析,得到机组负荷的相似性特征。然后提出了一种适用于火电机组负荷预测的历史匹配预测算法(History matching and forecasting algorithm,HMF),HMF算法将预测时间点之前几个小时的负荷序列与同时段的历史负荷数据进行相似性匹配,利用最相似日的负荷变化趋势对未来负荷做出预测。算例测试表明:HMF算法未来3 h的负荷预测平均误差为4.412%,比传统的自回归滑动平均模型(Autoregressive moving average model,ARMA)具有更高的预测精度,且在变负荷过程中也能取得较好的预测效果。
