Research efforts on electromagnetic interference(EMI)shielding materials have begun to converge on green and sustainable biomass materials.These materials offer numerous advantages such as being lightweight,porous,and...Research efforts on electromagnetic interference(EMI)shielding materials have begun to converge on green and sustainable biomass materials.These materials offer numerous advantages such as being lightweight,porous,and hierarchical.Due to their porous nature,interfacial compatibility,and electrical conductivity,biomass materials hold significant potential as EMI shielding materials.Despite concerted efforts on the EMI shielding of biomass materials have been reported,this research area is still relatively new compared to traditional EMI shielding materials.In particular,a more comprehensive study and summary of the factors influencing biomass EMI shielding materials including the pore structure adjustment,preparation process,and micro-control would be valuable.The preparation methods and characteristics of wood,bamboo,cellulose and lignin in EMI shielding field are critically discussed in this paper,and similar biomass EMI materials are summarized and analyzed.The composite methods and fillers of various biomass materials were reviewed.this paper also highlights the mechanism of EMI shielding as well as existing prospects and challenges for development trends in this field.展开更多
With the continuous development of various industries and the increasing use of electricity and fuel,the emission of large amounts of greenhouse gases has seriously affected the ecosystem.Bulk coal is often used as a ...With the continuous development of various industries and the increasing use of electricity and fuel,the emission of large amounts of greenhouse gases has seriously affected the ecosystem.Bulk coal is often used as a fuel for metallurgy and power generation,but the harmful gases produced by its combustion cause serious pollution to the environment.To reduce the emission of harmful gases,we found that biomass briquette has the characteristics of low heavy metal content and less pollutant release when burned.In this paper,the preparation and influencing factors of biomass briquette,the characteristics of different types of biomass briquette and the pollution characteristics of biomass briquette are reviewed.The potential pollution during the preparation and combustion of biomass briquette was also discussed from the perspective of life cycle assessment.Compared with bulk coal,biomass briquette emits fewer toxic gases during preparation and combustion,such as NO_(x)and SO_(2).Secondly,the preparation of biomass briquette can also reduce the burden of water resources and soil.To that end,we explore the hazards caused by the preparation and combustion of biomass briquette,analyze its impact on the environment and human body,and summarize the sulfur and nitrogen retention capacity of biomass briquette to achieve the purpose of reducing harmful gas emissions.The results show that biomass briquette can be used as clean coal-based energy instead of traditional energy because of its low harmful substance content.The development and application prospect of biomass briquette under the framework of sustainable development are discussed.展开更多
The physicochemical properties and composition of coix seed oil produced by Monascus purpureus fermentation and supercritical CO_(2)extraction were determined.Anti-lipid-oxidation and edible safety were evaluated usin...The physicochemical properties and composition of coix seed oil produced by Monascus purpureus fermentation and supercritical CO_(2)extraction were determined.Anti-lipid-oxidation and edible safety were evaluated using a cholesterol-fish oil model,acute oral toxicity assay,and genetic toxicity assay in vitro and in vivo,respectively.The results show that the extraction oil from fermented coix seed(FCS-O)had good physicochemical quality and abundant active components with physiological function.In particular,γ-tocotrienol,γ-oryzanol,coixenolide and oleic acid concentrations reached 72.83μg/g,745.96μg/g,9.65 mg/g and 316.58 mg/100 g DW,respectively.The FCS-O exhibited higher antioxidant capability in inhibiting lipid oxidation and peroxidation.Compared to the blank control,the concentrations of 7-ketocholestreol and peroxide only were 8.42μg/mL and 16.16 mmol/kg at 168 h of oxidation(P<0.01).In addition,the FCS-O has been confirmed to be a very safe edible oil,with no acute toxicity(LD50>10 g/kg bw,considered actually non-toxic)and no induced mutagenicity,cytotoxicity or genotoxicity.These results serve as a good safety reference for future application of the oil from fermented coix seed.The development and utilization of this kind of oil will be beneficial as a food,food ingredient,nutritional supplement,or natural food antioxidant to promote good health function.展开更多
Grammar has experienced its vicissitudes or ups and downs in the course of language instruction. It was once regarded as the most crucial issue in language instruction. However, the recognition of transformation in th...Grammar has experienced its vicissitudes or ups and downs in the course of language instruction. It was once regarded as the most crucial issue in language instruction. However, the recognition of transformation in the kind of proficiency that learners need, together with the achievements obtained in such fields as linguistics and teaching methodology and so forth, result in the Great Grammar Debates. Consequently, as a shackle on learners＇ imagination, grammar became irrelevant. In the last few years, however, the pendulum of grammar instruction seems to be on the return swing because of public pressure for standards and testing. Grammar instruction experiences the similar rises and falls in China and viewpoints from middle school students should be taken into serious consideration while we carry out English teaching in China.展开更多
Background:The extracellular matrix(ECM)provides essential physical support and biochemical cues for diverse biological activities,including tissue remodelling and regeneration,and thus is commonly applied in the cons...Background:The extracellular matrix(ECM)provides essential physical support and biochemical cues for diverse biological activities,including tissue remodelling and regeneration,and thus is commonly applied in the construction of artificial peripheral nerve grafts.Nevertheless,the specific functions of essential peripheral nerve ECM components have not been fully determined.Our research aimed to differentially represent the neural activities of main components of ECM on peripheral nerve regeneration.Methods:Schwann cells from sciatic nerves and neurons from dorsal root ganglia were isolated and cultured in vitro.The cells were seeded onto noncoated dishes,Matrigel-coated dishes,and dishes coated with the four major ECM components fibronectin,laminin,collagen I,and collagen IV.The effects of these ECM components on Schwann cell proliferation were determined via methylthiazolyldiphenyl-tetrazolium bromide(MTT),Cell Counting Kit-8,and 5-ethynyl-2’-deoxyuridine(EdU)assays,whereas their effects on cell migration were determined via wound healing and live-cell imaging.Neurite growth in neurons cultured on different ECM components was observed.Furthermore,the two types of collagen were incorporated into chitosan artificial nerves and used to repair sciatic nerve defects in rats.Immunofluorescence analysis and a behavioural assessment,including gait,electrophysiology,and target muscle analysis,were conducted.Results:ECM components,especially collagen I,stimulated the DNA synthesis and movement of Schwann cells.Direct measurement of the neurite lengths of neurons cultured on ECM components further revealed the beneficial effects of ECM components on neurite outgrowth.Injection of collagen I into chitosan and poly(lactic-co-glycolic acid)artificial nerves demonstrated that collagen I facilitated axon regeneration and functional recovery after nerve defect repair by stimulating the migration of Schwann cells and the formation of new blood vessels.In contrast,collagen IV recruited excess fibroblasts and inflammatory macrophages and thus had disadvantageous effects on nerve regeneration.Conclusions:These findings reveal the modulatory effects of specific ECM components on cell populations of peripheral nerves,reveal the contributing roles of collagen I in microenvironment construction and axon regeneration,and highlight the use of collagen I for the healing of injured peripheral nerves.展开更多
This paper investigates the feasibility of using a Li-Baker detector based on a modulated Gaussian beam to detect gravitational waves in the GHz band.The first-order perturbation photon fluxes(PPF,signal of the detect...This paper investigates the feasibility of using a Li-Baker detector based on a modulated Gaussian beam to detect gravitational waves in the GHz band.The first-order perturbation photon fluxes(PPF,signal of the detector)and the background photon fluxes(BPF,main noise of the detector),which vary with time,and the transverse distance are calculated.The results show that their propagation directions and energy densities are much different in some areas.Apart from BPF,we also consider two other important noises:diffraction noise and shot noise.In the simulation,it is found that the diffraction noise and shot noise are both lower than the signal level.Meanwhile,the main noise(BPF)can be eliminated when the receiving screen is located in certain special transverse areas where the BPF direction is opposite to that of PPF.Thus,the signal to noise ratio(SNR)obtained using our detection method can reach up to 320 in some transverse areas.These results are beneficial for the design of the Li-Baker detector.展开更多
基金National Natural Science Foundation of China(32201491)Young Elite Scientists Sponsorship Program by CAST(2023QNRC001)The authors extend their appreciation to the Deanship of Scientific Research at Northern Border University,Arar,KSA for funding this research work through the project number“NBU-FPEJ-2024-1101-02”.
文摘Research efforts on electromagnetic interference(EMI)shielding materials have begun to converge on green and sustainable biomass materials.These materials offer numerous advantages such as being lightweight,porous,and hierarchical.Due to their porous nature,interfacial compatibility,and electrical conductivity,biomass materials hold significant potential as EMI shielding materials.Despite concerted efforts on the EMI shielding of biomass materials have been reported,this research area is still relatively new compared to traditional EMI shielding materials.In particular,a more comprehensive study and summary of the factors influencing biomass EMI shielding materials including the pore structure adjustment,preparation process,and micro-control would be valuable.The preparation methods and characteristics of wood,bamboo,cellulose and lignin in EMI shielding field are critically discussed in this paper,and similar biomass EMI materials are summarized and analyzed.The composite methods and fillers of various biomass materials were reviewed.this paper also highlights the mechanism of EMI shielding as well as existing prospects and challenges for development trends in this field.
基金the Young Elite Scientists Sponsorship Program by CAST(2023QNRC001).
文摘With the continuous development of various industries and the increasing use of electricity and fuel,the emission of large amounts of greenhouse gases has seriously affected the ecosystem.Bulk coal is often used as a fuel for metallurgy and power generation,but the harmful gases produced by its combustion cause serious pollution to the environment.To reduce the emission of harmful gases,we found that biomass briquette has the characteristics of low heavy metal content and less pollutant release when burned.In this paper,the preparation and influencing factors of biomass briquette,the characteristics of different types of biomass briquette and the pollution characteristics of biomass briquette are reviewed.The potential pollution during the preparation and combustion of biomass briquette was also discussed from the perspective of life cycle assessment.Compared with bulk coal,biomass briquette emits fewer toxic gases during preparation and combustion,such as NO_(x)and SO_(2).Secondly,the preparation of biomass briquette can also reduce the burden of water resources and soil.To that end,we explore the hazards caused by the preparation and combustion of biomass briquette,analyze its impact on the environment and human body,and summarize the sulfur and nitrogen retention capacity of biomass briquette to achieve the purpose of reducing harmful gas emissions.The results show that biomass briquette can be used as clean coal-based energy instead of traditional energy because of its low harmful substance content.The development and application prospect of biomass briquette under the framework of sustainable development are discussed.
基金supported by Natural Science Foundation of China(32260583)the Agriculture Committee of Guizhou Province[(2017)106&(2018)81]the Talent Introduction Program of Guizhou University[(2021)76].
文摘The physicochemical properties and composition of coix seed oil produced by Monascus purpureus fermentation and supercritical CO_(2)extraction were determined.Anti-lipid-oxidation and edible safety were evaluated using a cholesterol-fish oil model,acute oral toxicity assay,and genetic toxicity assay in vitro and in vivo,respectively.The results show that the extraction oil from fermented coix seed(FCS-O)had good physicochemical quality and abundant active components with physiological function.In particular,γ-tocotrienol,γ-oryzanol,coixenolide and oleic acid concentrations reached 72.83μg/g,745.96μg/g,9.65 mg/g and 316.58 mg/100 g DW,respectively.The FCS-O exhibited higher antioxidant capability in inhibiting lipid oxidation and peroxidation.Compared to the blank control,the concentrations of 7-ketocholestreol and peroxide only were 8.42μg/mL and 16.16 mmol/kg at 168 h of oxidation(P<0.01).In addition,the FCS-O has been confirmed to be a very safe edible oil,with no acute toxicity(LD50>10 g/kg bw,considered actually non-toxic)and no induced mutagenicity,cytotoxicity or genotoxicity.These results serve as a good safety reference for future application of the oil from fermented coix seed.The development and utilization of this kind of oil will be beneficial as a food,food ingredient,nutritional supplement,or natural food antioxidant to promote good health function.
文摘Grammar has experienced its vicissitudes or ups and downs in the course of language instruction. It was once regarded as the most crucial issue in language instruction. However, the recognition of transformation in the kind of proficiency that learners need, together with the achievements obtained in such fields as linguistics and teaching methodology and so forth, result in the Great Grammar Debates. Consequently, as a shackle on learners＇ imagination, grammar became irrelevant. In the last few years, however, the pendulum of grammar instruction seems to be on the return swing because of public pressure for standards and testing. Grammar instruction experiences the similar rises and falls in China and viewpoints from middle school students should be taken into serious consideration while we carry out English teaching in China.
基金supported by grants from the National Key R&D Program of China(2022YFC24098002022YFC2409802)the Postgraduate Research&Practice Innovation Program of Jiangsu Province(KYCX23_3381)+3 种基金the Natural Science Foundation of Jiangsu Province(BK20231338)Jiangsu Provincial Key Medical Center and Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)Jiangsu College Students Innovation and Entrepreneurship Training Program(202310304120Y)the Science and Technology Plan Program of Nantong(MS2023050).
文摘Background:The extracellular matrix(ECM)provides essential physical support and biochemical cues for diverse biological activities,including tissue remodelling and regeneration,and thus is commonly applied in the construction of artificial peripheral nerve grafts.Nevertheless,the specific functions of essential peripheral nerve ECM components have not been fully determined.Our research aimed to differentially represent the neural activities of main components of ECM on peripheral nerve regeneration.Methods:Schwann cells from sciatic nerves and neurons from dorsal root ganglia were isolated and cultured in vitro.The cells were seeded onto noncoated dishes,Matrigel-coated dishes,and dishes coated with the four major ECM components fibronectin,laminin,collagen I,and collagen IV.The effects of these ECM components on Schwann cell proliferation were determined via methylthiazolyldiphenyl-tetrazolium bromide(MTT),Cell Counting Kit-8,and 5-ethynyl-2’-deoxyuridine(EdU)assays,whereas their effects on cell migration were determined via wound healing and live-cell imaging.Neurite growth in neurons cultured on different ECM components was observed.Furthermore,the two types of collagen were incorporated into chitosan artificial nerves and used to repair sciatic nerve defects in rats.Immunofluorescence analysis and a behavioural assessment,including gait,electrophysiology,and target muscle analysis,were conducted.Results:ECM components,especially collagen I,stimulated the DNA synthesis and movement of Schwann cells.Direct measurement of the neurite lengths of neurons cultured on ECM components further revealed the beneficial effects of ECM components on neurite outgrowth.Injection of collagen I into chitosan and poly(lactic-co-glycolic acid)artificial nerves demonstrated that collagen I facilitated axon regeneration and functional recovery after nerve defect repair by stimulating the migration of Schwann cells and the formation of new blood vessels.In contrast,collagen IV recruited excess fibroblasts and inflammatory macrophages and thus had disadvantageous effects on nerve regeneration.Conclusions:These findings reveal the modulatory effects of specific ECM components on cell populations of peripheral nerves,reveal the contributing roles of collagen I in microenvironment construction and axon regeneration,and highlight the use of collagen I for the healing of injured peripheral nerves.
基金the National Natural Science Foundation of China(12147102)the Youth Science and Technology Innovation Research Team of Sichuan Province,China(21CXTD0038)。
文摘This paper investigates the feasibility of using a Li-Baker detector based on a modulated Gaussian beam to detect gravitational waves in the GHz band.The first-order perturbation photon fluxes(PPF,signal of the detector)and the background photon fluxes(BPF,main noise of the detector),which vary with time,and the transverse distance are calculated.The results show that their propagation directions and energy densities are much different in some areas.Apart from BPF,we also consider two other important noises:diffraction noise and shot noise.In the simulation,it is found that the diffraction noise and shot noise are both lower than the signal level.Meanwhile,the main noise(BPF)can be eliminated when the receiving screen is located in certain special transverse areas where the BPF direction is opposite to that of PPF.Thus,the signal to noise ratio(SNR)obtained using our detection method can reach up to 320 in some transverse areas.These results are beneficial for the design of the Li-Baker detector.
