Acrylonitrile–butadiene–styrene(ABS)is the main material used in fused deposition modeling(FDM),which has good toughness and strength,but the single ABS material has poor heat resistance,which tends to cause warping...Acrylonitrile–butadiene–styrene(ABS)is the main material used in fused deposition modeling(FDM),which has good toughness and strength,but the single ABS material has poor heat resistance,which tends to cause warping and deformation during the printing process.Polycarbonate(PC)exhibits good performance in heat resistance,allowing it to maintain stable performance at higher temperatures.In this work,PC was used as a blending modifier to prepare five kinds of ABS/PC composite filaments,and the mechanical and thermal properties of the ABS/PC(Acrylonitrile-butadiene-styrene/Polycarbonate)composite filaments were studied and analyzed.Results showed that the glass transition temperature(Tg)of the blend increased continuously as the PC content increased.When the mass fraction of ABS/PC was 50/50,the glass transition temperature of the blend increased by 21.21%,and the tensile strength of the composites reached 40.23 MPa,which was an increase of 36.47% compared with that of pure ABS.However,the impact strength of the composites decreased with the addition of PC.Moreover,with the increase in the mass fraction of PC,the printing accuracy error increased from 0.02 to 0.18 mm.The results of this paper will promote the improvement of ABS printing performance and enrich the available materials for FDM.展开更多
The recent initiative by China’s National Medical Products Administration(NMPA)to realign traditional Chinese medicine(TCM)registration with clinical value marks a pivotal shift toward modernizing and enhancing the e...The recent initiative by China’s National Medical Products Administration(NMPA)to realign traditional Chinese medicine(TCM)registration with clinical value marks a pivotal shift toward modernizing and enhancing the efficacy of TCM.This initiative reflects a progressive attitude toward integrating TCM’s rich heritage with contemporary medical needs,ensuring that it remains relevant and effective in addressing modern health challenges[1].展开更多
The coronavirus(COVID-19)pandemic is disrupting the world from many aspects.In this study,the impact of emission variations on PM_(2.5)-bound elemental species and health risks associated to inhalation exposure has be...The coronavirus(COVID-19)pandemic is disrupting the world from many aspects.In this study,the impact of emission variations on PM_(2.5)-bound elemental species and health risks associated to inhalation exposure has been analyzed based on real-time measurements at a remote coastal site in Shanghai during the pandemic.Most trace elemental species decreased significantly and displayed almost no diel peaks during the lockdown.After the lockdown,they rebounded rapidly,of which V and Ni even exceeded the levels before the lockdown,suggesting the recovery of both inland and shipping activities.Five sources were identified based on receptor modeling.Coal combustion accounted for more than 70%of the measured elemental concentrations before and during the lockdown.Shipping emissions,fugitive/mineral dust,and waste incineration all showed elevated contributions after the lockdown.The total non-carcinogenic risk(HQ)for the target elements exceeded the risk threshold for both children and adults with chloride as the predominant species contributing to HQ.Whereas,the total carcinogenic risk(TR)for adults was above the acceptable level and much higher than that for children.Waste incineration was the largest contributor to HQ,while manufacture processing and coal combustion were the main sources of TR.Lockdown control measures were beneficial for lowering the carcinogenic risk while unexpectedly increased the non-carcinogenic risk.From the perspective of health effects,priorities of control measures should be given to waste incineration,manufacture processing,and coal combustion.A balanced way should be reached between both lowering the levels of air pollutants and their health risks.展开更多
The period since the 18th National Congress of the Communist Party of China(CPC)has witnessed the emerging of innovative achievements in traditional Chinese medicine(TCM).To fulfill the requirements proposed at the 20...The period since the 18th National Congress of the Communist Party of China(CPC)has witnessed the emerging of innovative achievements in traditional Chinese medicine(TCM).To fulfill the requirements proposed at the 20th National Congress of the CPC and in the Opinions of the CPC Central Committee and the State Council on Promoting the Preservation,Innovation,and Development of Traditional ChineseMedicine and give play to the demonstrative role ofmajor research achievements,the China Association of ChineseMedicine has organized TCM researchers and practitioners to comprehensively review the major research achievements in TCM since the 18th National Congress of the CPC.After collection and organization of achievements,report writing,expert evaluation,and public opinion soliciting,we have compiled the Remarkable Research Achievements of Traditional Chinese Medicine during 2012–2022.展开更多
基金the Natural Science Foundation of Shandong Province(grant no.ZR2020KF024)Yantai City Science and Technology Plan Project(grant no.2022ZDCX016)+1 种基金the University Research Project of Shandong Province(grant no.J17KB007)Natural Science Foundation of Shandong Jiaotong University(grant no.Z201937).
文摘Acrylonitrile–butadiene–styrene(ABS)is the main material used in fused deposition modeling(FDM),which has good toughness and strength,but the single ABS material has poor heat resistance,which tends to cause warping and deformation during the printing process.Polycarbonate(PC)exhibits good performance in heat resistance,allowing it to maintain stable performance at higher temperatures.In this work,PC was used as a blending modifier to prepare five kinds of ABS/PC composite filaments,and the mechanical and thermal properties of the ABS/PC(Acrylonitrile-butadiene-styrene/Polycarbonate)composite filaments were studied and analyzed.Results showed that the glass transition temperature(Tg)of the blend increased continuously as the PC content increased.When the mass fraction of ABS/PC was 50/50,the glass transition temperature of the blend increased by 21.21%,and the tensile strength of the composites reached 40.23 MPa,which was an increase of 36.47% compared with that of pure ABS.However,the impact strength of the composites decreased with the addition of PC.Moreover,with the increase in the mass fraction of PC,the printing accuracy error increased from 0.02 to 0.18 mm.The results of this paper will promote the improvement of ABS printing performance and enrich the available materials for FDM.
文摘The recent initiative by China’s National Medical Products Administration(NMPA)to realign traditional Chinese medicine(TCM)registration with clinical value marks a pivotal shift toward modernizing and enhancing the efficacy of TCM.This initiative reflects a progressive attitude toward integrating TCM’s rich heritage with contemporary medical needs,ensuring that it remains relevant and effective in addressing modern health challenges[1].
基金financially supported by the National Key R&D Program of China(No.2018YFC0213105)the National Science Foundation of China(No.91644105)the Natural Science Foundation of Shanghai(18230722600,19ZR1421100,20ZR1422000)。
文摘The coronavirus(COVID-19)pandemic is disrupting the world from many aspects.In this study,the impact of emission variations on PM_(2.5)-bound elemental species and health risks associated to inhalation exposure has been analyzed based on real-time measurements at a remote coastal site in Shanghai during the pandemic.Most trace elemental species decreased significantly and displayed almost no diel peaks during the lockdown.After the lockdown,they rebounded rapidly,of which V and Ni even exceeded the levels before the lockdown,suggesting the recovery of both inland and shipping activities.Five sources were identified based on receptor modeling.Coal combustion accounted for more than 70%of the measured elemental concentrations before and during the lockdown.Shipping emissions,fugitive/mineral dust,and waste incineration all showed elevated contributions after the lockdown.The total non-carcinogenic risk(HQ)for the target elements exceeded the risk threshold for both children and adults with chloride as the predominant species contributing to HQ.Whereas,the total carcinogenic risk(TR)for adults was above the acceptable level and much higher than that for children.Waste incineration was the largest contributor to HQ,while manufacture processing and coal combustion were the main sources of TR.Lockdown control measures were beneficial for lowering the carcinogenic risk while unexpectedly increased the non-carcinogenic risk.From the perspective of health effects,priorities of control measures should be given to waste incineration,manufacture processing,and coal combustion.A balanced way should be reached between both lowering the levels of air pollutants and their health risks.
基金This work was supported by the Research Projects on Key Development Issues and Scientific Layout Strategies for Traditional Chinese Medicine(grant number:GZY-KJS-2023-047)National Overall Scientific and Technological Capabilities Third-Party Evaluation-Assessment Project on the Foundational Science Progress for the Modernization of Traditional ChineseMedicine(grant number:2023-pgsdx-35).
文摘The period since the 18th National Congress of the Communist Party of China(CPC)has witnessed the emerging of innovative achievements in traditional Chinese medicine(TCM).To fulfill the requirements proposed at the 20th National Congress of the CPC and in the Opinions of the CPC Central Committee and the State Council on Promoting the Preservation,Innovation,and Development of Traditional ChineseMedicine and give play to the demonstrative role ofmajor research achievements,the China Association of ChineseMedicine has organized TCM researchers and practitioners to comprehensively review the major research achievements in TCM since the 18th National Congress of the CPC.After collection and organization of achievements,report writing,expert evaluation,and public opinion soliciting,we have compiled the Remarkable Research Achievements of Traditional Chinese Medicine during 2012–2022.
