The C.oleifera oil processing industry generates large amounts of solid wastes,including C.oleifera shell(COS)and C.oleifera cake(COC).Distinct from generally acknowledged lignocellulosic biomass(corn stover,bamboo,bi...The C.oleifera oil processing industry generates large amounts of solid wastes,including C.oleifera shell(COS)and C.oleifera cake(COC).Distinct from generally acknowledged lignocellulosic biomass(corn stover,bamboo,birch,etc.),Camellia wastes contain diverse bioactive substances in addition to the abundant lignocellulosic components,and thus,the biorefinery utilization of C.oleifera processing byproducts involves complicated processing technologies.This reviewfirst summarizes various technologies for extracting and converting the main components in C.oleifera oil processing byproducts into value-added chemicals and biobased materials,as well as their potential applications.Microwave,ultrasound,and Soxhlet extractions are compared for the extraction of functional bioactive components(tannin,flavonoid,saponin,etc.),while solvothermal conversion and pyrolysis are discussed for the conversion of lignocellulosic components into value-added chemicals.The application areas of these chemicals according to their properties are introduced in detail,including utilizing antioxidant and anti-in-flammatory properties of the bioactive substances for the specific application,as well as drop-in chemicals for the substitution of unrenewable fossil fuel-derived products.In addition to chemical production,biochar fabricated from COS and its applications in thefields of adsorption,supercapacitor,soil remediation and wood composites are comprehensively reviewed and discussed.Finally,based on the compositions and structural characteristics of C.oleifera byproducts,the development of full-component valorization strategies and the expansion of the appli-cationfields are proposed.展开更多
Tung oil(TO)/ultraviolet(UV)photo-composite curing material possesses the characteristics of low curing temperature,low material shrinkage and low environmental pollution.Accordingly,this material must be developed an...Tung oil(TO)/ultraviolet(UV)photo-composite curing material possesses the characteristics of low curing temperature,low material shrinkage and low environmental pollution.Accordingly,this material must be developed and utilized with the conjugated double bonds contained in the long chain of the main structure(α-tung acid)molecules in the refined TO.The aforementioned material can be chemically modified using a variety of chemical methods to develop a new TO-based UV photocurable material due to its unique chemical properties.This work reviews the research progress of TO/UV photo-composite curing materials in recent years.Firstly,the chemical structure and application of TO and UV Photocatalysis Technology were briefly introduced.Secondly,the research status of novel TO/UV photo-composite curing materials developed by the Diels-Alder reaction was discussed.The method and curing effect of the UVcuring system constructed by other chemically modified TO were also discussed.Thereafter,the application of TO in industrial production is introduced from four directions:the application of TO in biodiesel,the application in synthetic resin,the application in self-healing coating and microcapsules and other applications.Finally,the research and application prospects of TO/UV photo-composite curing materials were presented.展开更多
The author introduces the w-function defined on the considered spacelike graph M.Under the growth conditions w = o(log z) and w = o(r),two Bernstein type theorems for M in Rmn+ mare got,where z and r are the pseudo-Eu...The author introduces the w-function defined on the considered spacelike graph M.Under the growth conditions w = o(log z) and w = o(r),two Bernstein type theorems for M in Rmn+ mare got,where z and r are the pseudo-Euclidean distance and the distance function on M to some fixed point respectively.As the ambient space is a curved pseudoRiemannian product of two Riemannian manifolds(Σ1,g1) and(Σ2,g2) of dimensions n and m,a Bernstein type result for n = 2 under some curvature conditions on Σ1 and Σ2 and the growth condition w = o(r) is also got.As more general cases,under some curvature conditions on the ambient space and the growth condition w = o(r) or w = o(√r),the author concludes that if M has parallel mean curvature,then M is maximal.展开更多
我们导出在 pseudo-Grassmann 上定义的 w 功能的麻袋布估计歧管 G n， m m，它由估计是凸的。作为一个应用程序，我们由于 Y 给 Bernstein 类型定理的一个直接证明。Xin [Manuscripta 数学， 2000， 103：191202 ] 。我们也以 w 功能...我们导出在 pseudo-Grassmann 上定义的 w 功能的麻袋布估计歧管 G n， m m，它由估计是凸的。作为一个应用程序，我们由于 Y 给 Bernstein 类型定理的一个直接证明。Xin [Manuscripta 数学， 2000， 103：191202 ] 。我们也以 w 功能和吝啬的弯曲在伪 Euclidean 空间估计完全的 spacelike submanifold 的第二种基本形式的摆平的标准。展开更多
基金The authors acknowledge the financial support from the National Natural Science Foundation of China(Grant No.32201509)Hunan Science and Technology Xiaohe Talent Support Project(2022 TJ-XH 013)+6 种基金Science and Technology Innovation Program of Hunan Province(2022RC1156,2021RC2100)State Key Laboratory of Woody Oil Resource Utilization Common Key Technology Innovation for the Green Transformation of Woody Oil(XLKY202205)State Key Laboratory of Woody Oil Resource Utilization Project(2019XK2002)Key Research and Development Program of the State Forestry and Grassland Administration(GLM[2021]95)Hunan Forestry Outstanding Youth Project(XLK202108-1)Changsha Science and Technology Project(kq2202325,kq2107022)Science and Technology Innovation Leading Talent of Hunan Province(2020RC4026).
文摘The C.oleifera oil processing industry generates large amounts of solid wastes,including C.oleifera shell(COS)and C.oleifera cake(COC).Distinct from generally acknowledged lignocellulosic biomass(corn stover,bamboo,birch,etc.),Camellia wastes contain diverse bioactive substances in addition to the abundant lignocellulosic components,and thus,the biorefinery utilization of C.oleifera processing byproducts involves complicated processing technologies.This reviewfirst summarizes various technologies for extracting and converting the main components in C.oleifera oil processing byproducts into value-added chemicals and biobased materials,as well as their potential applications.Microwave,ultrasound,and Soxhlet extractions are compared for the extraction of functional bioactive components(tannin,flavonoid,saponin,etc.),while solvothermal conversion and pyrolysis are discussed for the conversion of lignocellulosic components into value-added chemicals.The application areas of these chemicals according to their properties are introduced in detail,including utilizing antioxidant and anti-in-flammatory properties of the bioactive substances for the specific application,as well as drop-in chemicals for the substitution of unrenewable fossil fuel-derived products.In addition to chemical production,biochar fabricated from COS and its applications in thefields of adsorption,supercapacitor,soil remediation and wood composites are comprehensively reviewed and discussed.Finally,based on the compositions and structural characteristics of C.oleifera byproducts,the development of full-component valorization strategies and the expansion of the appli-cationfields are proposed.
基金funded by Major Landmark Innovation Demonstration Project,2019XK2002Changsha Functional Oil Technology Innovation Center,KH2101007Hunan Forestry Bureau Outstanding Training Research Project,XLK202108-2.
文摘Tung oil(TO)/ultraviolet(UV)photo-composite curing material possesses the characteristics of low curing temperature,low material shrinkage and low environmental pollution.Accordingly,this material must be developed and utilized with the conjugated double bonds contained in the long chain of the main structure(α-tung acid)molecules in the refined TO.The aforementioned material can be chemically modified using a variety of chemical methods to develop a new TO-based UV photocurable material due to its unique chemical properties.This work reviews the research progress of TO/UV photo-composite curing materials in recent years.Firstly,the chemical structure and application of TO and UV Photocatalysis Technology were briefly introduced.Secondly,the research status of novel TO/UV photo-composite curing materials developed by the Diels-Alder reaction was discussed.The method and curing effect of the UVcuring system constructed by other chemically modified TO were also discussed.Thereafter,the application of TO in industrial production is introduced from four directions:the application of TO in biodiesel,the application in synthetic resin,the application in self-healing coating and microcapsules and other applications.Finally,the research and application prospects of TO/UV photo-composite curing materials were presented.
文摘The author introduces the w-function defined on the considered spacelike graph M.Under the growth conditions w = o(log z) and w = o(r),two Bernstein type theorems for M in Rmn+ mare got,where z and r are the pseudo-Euclidean distance and the distance function on M to some fixed point respectively.As the ambient space is a curved pseudoRiemannian product of two Riemannian manifolds(Σ1,g1) and(Σ2,g2) of dimensions n and m,a Bernstein type result for n = 2 under some curvature conditions on Σ1 and Σ2 and the growth condition w = o(r) is also got.As more general cases,under some curvature conditions on the ambient space and the growth condition w = o(r) or w = o(√r),the author concludes that if M has parallel mean curvature,then M is maximal.
