This study focuses on analyzing aqueous solutions of aroma-active compounds in Xinhui Chenpi distilled after being heated with headspace solid-phase microextraction and gas chromatography-mass spectrometry(HS-SPME-GC/...This study focuses on analyzing aqueous solutions of aroma-active compounds in Xinhui Chenpi distilled after being heated with headspace solid-phase microextraction and gas chromatography-mass spectrometry(HS-SPME-GC/MS).Feasibility of this method was also tested by comparison with crushed samples.The study also analyzed the aqueous solutions of the aroma-active compounds employing gas chromatography-olfactometry(GC-O)defense,aroma extraction dilution analysis(AEDA)and odor activity value(OAV)as well as their emission patterns.According to the study,there are 24 major aroma-active detected in the aqueous solution.Linalool,d-limonene,2-methoxy-4-vinylphenol,andα-terpineol with sweet,spicy,and woody aroma contributed the most to the aroma-active compounds and were considered to be the essential aroma substances of Chenpi.When heated,the aroma of aromatic-active compounds rich in Chenpi volatilized rapidly and the release dropped dramatically in a short time.The substantial aroma-active compounds can be collected from the first ten released segments.展开更多
High temperature in diffusion bonding(DB)process severely deteriorates the performance of zirconium(Zr)R60702 in extreme chemical environment.Therefore,it is important to reduce the DB temperature of Zr R60702.In this...High temperature in diffusion bonding(DB)process severely deteriorates the performance of zirconium(Zr)R60702 in extreme chemical environment.Therefore,it is important to reduce the DB temperature of Zr R60702.In this work,low-temperature diffusion bonding of Zr R60702 at 750°C is realized by 0.3 wt%hydrogen addition while 900°C is required in DB process for unhydrogenated Zr R60702.The shear strength of the hydrogenated joint bonded at 750°C reaches 388 MPa,which is 117.98%higher than that of the unhydrogenated joint bonded at 750°C and equal to that of the unhydrogenated joint bonded at 900°C.The effects of hydrogen addition in Zr R60702 on the microstructure evolution,phase transformation temperature,interatomic bonding and self-diffusion coefficient of Zr atoms are investigated in detail.The results show that the optimized DB properties can be attributed to the improvements of its grain boundary diffusion,plasticity and self-diffusion coefficient of Zr atoms.展开更多
As the most important non-cereal food crop,potatoes are a staple food for 1.3 billion people(Stokstad,2019).However,these cultivated potatoes are challenged with multiple biotic stresses(i.e.,pathogens and pests),some...As the most important non-cereal food crop,potatoes are a staple food for 1.3 billion people(Stokstad,2019).However,these cultivated potatoes are challenged with multiple biotic stresses(i.e.,pathogens and pests),some of which can evade host resistance,leading to a serious dampening of potato yield.One of these pests is the Colorado potato beetle(hereafter referred to as CPB,Leptinotarsa decemlineata Say).CPB is a member of the order Coleoptera,and originated in the southwestern United States and Mexico(Alyokhin et al.,2008).展开更多
基金Youth Top Talents Project in Tianjin Special Support Program,the Science and technology Project of Tianjin(Grant No.21ZYCGSN00410)the Science and technology Project of Tianjin(Grant No.21YDTPJC00910)+4 种基金the National Natural Science Foundation of China[32102004]the Project funded by China Postdoctoral Science Foundation[2021M701169,2022T150206]the China Agriculture Research System of MOF and MARAthe Construction of World Big-leaf Tea Technology Innovation Center and Industrialization of Achievements[202102AE090038]the Scientific and Technological Talents and Platform Plan(Academician Expert Workstation)[202104AC100001-B01].
文摘This study focuses on analyzing aqueous solutions of aroma-active compounds in Xinhui Chenpi distilled after being heated with headspace solid-phase microextraction and gas chromatography-mass spectrometry(HS-SPME-GC/MS).Feasibility of this method was also tested by comparison with crushed samples.The study also analyzed the aqueous solutions of the aroma-active compounds employing gas chromatography-olfactometry(GC-O)defense,aroma extraction dilution analysis(AEDA)and odor activity value(OAV)as well as their emission patterns.According to the study,there are 24 major aroma-active detected in the aqueous solution.Linalool,d-limonene,2-methoxy-4-vinylphenol,andα-terpineol with sweet,spicy,and woody aroma contributed the most to the aroma-active compounds and were considered to be the essential aroma substances of Chenpi.When heated,the aroma of aromatic-active compounds rich in Chenpi volatilized rapidly and the release dropped dramatically in a short time.The substantial aroma-active compounds can be collected from the first ten released segments.
基金supported by the NSFC-Liaoning Province United Foundation(U1908229)the National Natural Science Foundation of China(51875350)the Program of Shanghai Academic Research Leader(22XD1421600).
文摘High temperature in diffusion bonding(DB)process severely deteriorates the performance of zirconium(Zr)R60702 in extreme chemical environment.Therefore,it is important to reduce the DB temperature of Zr R60702.In this work,low-temperature diffusion bonding of Zr R60702 at 750°C is realized by 0.3 wt%hydrogen addition while 900°C is required in DB process for unhydrogenated Zr R60702.The shear strength of the hydrogenated joint bonded at 750°C reaches 388 MPa,which is 117.98%higher than that of the unhydrogenated joint bonded at 750°C and equal to that of the unhydrogenated joint bonded at 900°C.The effects of hydrogen addition in Zr R60702 on the microstructure evolution,phase transformation temperature,interatomic bonding and self-diffusion coefficient of Zr atoms are investigated in detail.The results show that the optimized DB properties can be attributed to the improvements of its grain boundary diffusion,plasticity and self-diffusion coefficient of Zr atoms.
基金the National Key R&D Program of China(2022YFD1700200,2021YFD1400200)Science Technology and Innovation Commission of Shenzhen Municipality of China(ZDSYS 20200811142605017)Major Projects for Talent Development in Guangdong Province of China(2021QN02N756).
文摘As the most important non-cereal food crop,potatoes are a staple food for 1.3 billion people(Stokstad,2019).However,these cultivated potatoes are challenged with multiple biotic stresses(i.e.,pathogens and pests),some of which can evade host resistance,leading to a serious dampening of potato yield.One of these pests is the Colorado potato beetle(hereafter referred to as CPB,Leptinotarsa decemlineata Say).CPB is a member of the order Coleoptera,and originated in the southwestern United States and Mexico(Alyokhin et al.,2008).
