Palm kernel shell(PKS)biochars with different levels of carbon conversion were initially prepared using a tube furnace,after which the reactivity of each sample was assessed with a thermogravimetric analyzer under a C...Palm kernel shell(PKS)biochars with different levels of carbon conversion were initially prepared using a tube furnace,after which the reactivity of each sample was assessed with a thermogravimetric analyzer under a CO_2 atmosphere.The pore structure and carbon ordering of each biochar also examined,employing a surface area analyzer and a Raman spectroscopy.Thermogravimetric results showed that the gasification index R_sof the PKS biochar decreased from 0.0305 min^(-1) at carbon conversion(x)=20% to 0.0278 min^(-1)at x=40%.The expansion of micropores was the dominant process during the pore structure evolution,ad mesopores with sizes ranging from 6 to 20,48 to 50 nm were primarily generated during gasification under a CO_2/H_2O mixture.The proportion of amorphous carbon in the PKS biochar decreased significantly as x increased,suggesting that the proportion of ordered carbon was increased during the CO_2/H_2O mixed gasification.A significantly reduced total reaction time was observed when employing a CO_2/intermittent H_2O process along with an 83.46% reduction in the steam feed,compared with the amount required using a CO_2/H_2O atmosphere.展开更多
The effects of Dy on the microstructure and magnetic properties of DyxCo50-xPt50 alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 ℃ contain only a single A 1 （fcc） phase, w...The effects of Dy on the microstructure and magnetic properties of DyxCo50-xPt50 alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 ℃ contain only a single A 1 （fcc） phase, while the alloys annealed at 675℃ consist of a hard-magnetic face-eentered-tetragonal （fct） phase and a magnetically soft face-centered-cube （fcc） phase. Maximum values for the coercivity and remanence ratio mr were achieved in DY0.4Co49.6Pt50 alloys annealed at 675 ℃ for 80 min. For the series of Dy Co50-xPt50 alloys annealed at 675 ℃ for 60 min, H decreases monotonically with increasing Dy concentration, but mr is first enhanced and then weakened,展开更多
The main propose of this paper is devoted to study the solvability of the generalized order tensor complementarity problem.We define two problems:the generalized order tensor complementarity problem and the vertical t...The main propose of this paper is devoted to study the solvability of the generalized order tensor complementarity problem.We define two problems:the generalized order tensor complementarity problem and the vertical tensor comple-mentarity problem and show that the former is equivalent to the latter.Using the degree theory,we present a comprehensive analysis of existence,uniqueness and stability of the solution set of a given generalized order tensor complementarity problem.展开更多
基金Supported by the Key Project of the Natural Science Foundation of Shandong Province(ZR2015QZ02)the Key Research&Development Program of Shandong Province(2016GSF117005)+1 种基金the introduction of scientific and technological innovation team of Ningxia Hui Autonomous Region(2016)Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(2017-K22)
文摘Palm kernel shell(PKS)biochars with different levels of carbon conversion were initially prepared using a tube furnace,after which the reactivity of each sample was assessed with a thermogravimetric analyzer under a CO_2 atmosphere.The pore structure and carbon ordering of each biochar also examined,employing a surface area analyzer and a Raman spectroscopy.Thermogravimetric results showed that the gasification index R_sof the PKS biochar decreased from 0.0305 min^(-1) at carbon conversion(x)=20% to 0.0278 min^(-1)at x=40%.The expansion of micropores was the dominant process during the pore structure evolution,ad mesopores with sizes ranging from 6 to 20,48 to 50 nm were primarily generated during gasification under a CO_2/H_2O mixture.The proportion of amorphous carbon in the PKS biochar decreased significantly as x increased,suggesting that the proportion of ordered carbon was increased during the CO_2/H_2O mixed gasification.A significantly reduced total reaction time was observed when employing a CO_2/intermittent H_2O process along with an 83.46% reduction in the steam feed,compared with the amount required using a CO_2/H_2O atmosphere.
基金Funded by the National Natural Science Foundation of China(No.51261004&50661002)the National Science foundation of Guangxi Province(2012GXNSFGA060002)
文摘The effects of Dy on the microstructure and magnetic properties of DyxCo50-xPt50 alloys were investigated. The XRD results indicate that all the alloys homogenized at 1000 ℃ contain only a single A 1 （fcc） phase, while the alloys annealed at 675℃ consist of a hard-magnetic face-eentered-tetragonal （fct） phase and a magnetically soft face-centered-cube （fcc） phase. Maximum values for the coercivity and remanence ratio mr were achieved in DY0.4Co49.6Pt50 alloys annealed at 675 ℃ for 80 min. For the series of Dy Co50-xPt50 alloys annealed at 675 ℃ for 60 min, H decreases monotonically with increasing Dy concentration, but mr is first enhanced and then weakened,
基金The first author is supported by the Fundamental Research Funds for the Central Universities under grant No.JBK1801058Partial work is fin-ished during the author’s visiting at Shanghai Key Laboratory of Contemporary Ap-plied Mathematics+2 种基金The second author is supported by the Hong Kong Research Grant Council(Grant Nos.PolyU 501913,15302114,15300715 and 15301716)The third author is supported by the National Natural Science Foundation of China under grant No.11771099Innovation Program of Shanghai Municipal Education Commission.We would like to thank the editor and two anonymous reviewers for very helpful com-ments.
文摘The main propose of this paper is devoted to study the solvability of the generalized order tensor complementarity problem.We define two problems:the generalized order tensor complementarity problem and the vertical tensor comple-mentarity problem and show that the former is equivalent to the latter.Using the degree theory,we present a comprehensive analysis of existence,uniqueness and stability of the solution set of a given generalized order tensor complementarity problem.
