In this paper we introduce the notions of mean dimension and metric mean dimension for non-autonomous iterated function systems(NAIFSs for short)on countably infinite alphabets which can be regarded as generalizations...In this paper we introduce the notions of mean dimension and metric mean dimension for non-autonomous iterated function systems(NAIFSs for short)on countably infinite alphabets which can be regarded as generalizations of the mean dimension and the Lindenstrauss metric mean dimension for non-autonomous iterated function systems.We also show the relationship between the mean topological dimension and the metric mean dimension.展开更多
The mechanism of sodium sulfide(Na2S)on the flotation of cyanide-depressed pyrite using potassium amyl xanthate(PAX)as collector was investigated by flotation test and electrochemical measurements.The flotation result...The mechanism of sodium sulfide(Na2S)on the flotation of cyanide-depressed pyrite using potassium amyl xanthate(PAX)as collector was investigated by flotation test and electrochemical measurements.The flotation results show that both PAX and Na2S can promote the flotation recovery of cyanide-depressed pyrite and their combination can further improve the pyrite flotation recovery.Electrochemical measurements show that PAX and Na2S interacted with cyanide-depressed pyrite through different mechanisms.PAX competed with cyanide and was adsorbed on the pyrite surface in the form of dixanthogen,thus enhancing the hydrophobicity and flotation of cyanide-depressed pyrite.Unlike PAX,Na2S rendered the pyrite surface hydrophobic through the reduction of ferricyanide species and the formation of elemental sulfur S0 and polysulfide Sn2-.The combined application of PAX and Na2S induced superior pyrite flotation recovery because of a synergistic effect between PAX and Na2S.展开更多
To realize the comprehensive utilization of coal-fired industrial solid wastes, a novel high-strength board was prepared from calcium silicate slag, fly ash, and flue gas desulfurization(FGD) gypsum. The changes in mi...To realize the comprehensive utilization of coal-fired industrial solid wastes, a novel high-strength board was prepared from calcium silicate slag, fly ash, and flue gas desulfurization(FGD) gypsum. The changes in mineral phases, chemical structure, and morphology during hydration were investigated by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), and scanning electron microscopy(SEM). A traditional board made from quartz and lime was prepared as a reference. The novel board not only consumes a lot of solid wastes, but also meets the strength requirement of the class-five calcium silicate board according to the Chinese Standard JC/T 564.2—2008. Microanalysis showed that hydrated calcium silicate gel(C-S-H(I)), ettringite, tobermorite, and xonotlite were successively generated in the novel board by synergistic hydration of the mixed solid wastes. The board strength was improved by the formation of tobermorite and xonotlite but decreased by unhydrated quartz. It was demonstrated that quartz was not completely hydrated in the traditional board. As a result, the flexural strength of the traditional board was much lower than that of the novel board.展开更多
We introduce and study the relation between Pesin-Pitskel topological pressure on an arbitrary subset and measure theoretic pressure of Borel probability measure for nonautonomous dynamical systems,which is an extensi...We introduce and study the relation between Pesin-Pitskel topological pressure on an arbitrary subset and measure theoretic pressure of Borel probability measure for nonautonomous dynamical systems,which is an extension of the classical definition of Bowen topological entropy.We show that the Pesin-Pitskel topological pressure can be determined by the local pressures of measures in nonautonomous case and establish a variational principle for Pesin-Pitskel topological pressure on compact subsets in the context of nonautonomous dynamical systems.展开更多
The storage of solid waste in Bayan Obo has resulted in significant resource wastage and environmental concerns.In this study,an efficient process was developed to recover iron and rare earth elements(REEs)from this w...The storage of solid waste in Bayan Obo has resulted in significant resource wastage and environmental concerns.In this study,an efficient process was developed to recover iron and rare earth elements(REEs)from this waste by processes of hydrogen-based mineral phase transformation(HMPT),magnetic separation,and flotation.Under optimal HMPT conditions(525℃,12.5 min,and 30%H_(2)concentration),an iron concentrate with a TFe grade of 64.09%and a recovery of 95.33%was obtained.The magnetic properties of the solid waste were greatly enhanced by HMPT,allowing the effective magnetic separation of iron minerals.Further optimization of the flotation process resulted in a REEs concentrate with a rare earth oxide(REO)grade of 65%-70%and a REEs recovery of 60%-65%.Hematite was reduced to magnetite during HMPT,and bastnaesite was decomposed to REEs oxides and fluorides,and the particle structure was significantly destroyed.However,changes in monazite,fluorite,and barite were minimal.展开更多
Bastnaesite is an important rare earth mineral and is usually beneficiated by flotation.Sodium silicate is commonly used to depress calcium-bearing gangue minerals,however it can also depress bastnaesite when Ca^(2+) ...Bastnaesite is an important rare earth mineral and is usually beneficiated by flotation.Sodium silicate is commonly used to depress calcium-bearing gangue minerals,however it can also depress bastnaesite when Ca^(2+) ions exist in the pulp.In this study,the effect of Ca^(2+) ions and sodium silicate individually or in combination on bastnaesite flotation was studied through micro-flotation,zeta potential,fluorescence spectroscopy and X-ray photoelectron spectroscopy(XPS) measurements.Micro-flotation results show that the combination of Ca^(2+) ions and sodium silicate depresses bastnaesite more severely due to their synergistic effect.Zeta potential results show that the combination renders the surface potential of bastnaesite negatively shifted more significantly.Fluorescence spectroscopy shows that the combination decreases the surface hydrophobicity of bastnaesite more severely.XPS shows that the combination increases the adsorption of sodium silicate on bastnaesite by forming hydrophilic Ca-SiO_(3) precipitate,which causes more serious depression on bastnaesite flotation.展开更多
Monazite((Ce,La)PO_(4))is one of the major types of light rare earth minerals from which the light rare earth elements cerium(Ce)and lanthanum(La)are economically extracted.Flotation is extensively used to recover fin...Monazite((Ce,La)PO_(4))is one of the major types of light rare earth minerals from which the light rare earth elements cerium(Ce)and lanthanum(La)are economically extracted.Flotation is extensively used to recover fine-grained monazite.Sodium oleate(NaOL)is considered as the collector with strong collecting ability for monazite flotation.However,this study shows that its collecting ability is still limited.In this paper,a phosphonic acid,nonane-1,1-bisphosphonic acid(C9-BPA),was employed as the novel collector in place of NaOL.Flotation experiments show that even when the C9-BPA dosage is less than one-fifth of the NaOL dosage,the monazite recove ry using C9-BPA as the collector is approximately 22 wt%higher than that using NaOL.The mechanism by which C9-BPA adsorbs on monazite was investigated using zeta potential,infrared(IR)spectroscopy and X-ray photoelectron spectroscopy(XPS)measurements as well as first-principles calculations.Zeta potential measurements show a more significant decrease in the zeta potentials of monazite after the addition of C9-BPA compared to those after the addition of NaOL.For C9-BPA-treated monazite,the characteristic peaks of C9-BPA are observed in the IR and C 1 s XPS spectrum,whereas for monazite treated by NaOL,no characteristic peak of NaOL was observed.Experimental results show that C9-BPA has a stronger affinity towards the monazite surface than NaOL as confirmed by the higher adsorption energy of CP-BPA on the monazite surface(-204.22 kJ/mol)than NaOL(-48.48 kJ/mol).This study demonstrates an extensive application value and prospect of C9-BPA in monazite flotation and helps design novel collectors with strong collecting ability for monazite flotation.展开更多
Asparagine-linked glycosylation protein 1 homolog(ALG1)participates in the initial stage of protein N-glycosylation and N-glycosylation has been implicated in the process of hepatocellular carcinoma(HCC)progression.Ho...Asparagine-linked glycosylation protein 1 homolog(ALG1)participates in the initial stage of protein N-glycosylation and N-glycosylation has been implicated in the process of hepatocellular carcinoma(HCC)progression.However,whether ALG1 plays a role in human HCC remains unknown.In this study,the expression profile of ALG1 in tumorous and corresponding adjacent non-tumor tissues was analyzed.The relationship of ALG1 expression with clinical features and prognosis of HCC patients was also evaluated using immuno-histochemical method.Here we found ALG1 decreased in HCC tissues compared with adjacent normal liver tissues,which predicted an unfavorable prognosis.Combined with RNA interference,nascent proteome and glycoproteome were determined systematically in Huh7 cell line.Bioinformatics analysis indicated that the differentially expressed proteins participating in the response of ALG1 knockdown were most significantly associated with cell-cell adhesion.Functional studies confirmed that knockdown of ALG1 reduced cell adhesion capacity,and promoted cell migration.Furthermore,down-regulation of H8N2(on N-glycosite N651)and H5N4S2F1(on N-glycosite N692)from N-cadherin was identified as a feature of ALG1 knockdown.Our findings revealed that ALG1 controlled the expression of glycosylated N-cadherin and played a role in HCC migration,with implications for prognosis.展开更多
文摘In this paper we introduce the notions of mean dimension and metric mean dimension for non-autonomous iterated function systems(NAIFSs for short)on countably infinite alphabets which can be regarded as generalizations of the mean dimension and the Lindenstrauss metric mean dimension for non-autonomous iterated function systems.We also show the relationship between the mean topological dimension and the metric mean dimension.
基金Project(51764045)supported by the National Natural Science Foundation of ChinaProject(NJYT-18-B08)supported by Inner Mongolia Young Science&Technology Talent Support Plan,China+1 种基金Project(GK-201804)supported by Research Fund Program of State Key Laboratory of Rare Metals Separation and Comprehensive Utilization,ChinaProject(DD20190574)supported by China Geological Survey Project
文摘The mechanism of sodium sulfide(Na2S)on the flotation of cyanide-depressed pyrite using potassium amyl xanthate(PAX)as collector was investigated by flotation test and electrochemical measurements.The flotation results show that both PAX and Na2S can promote the flotation recovery of cyanide-depressed pyrite and their combination can further improve the pyrite flotation recovery.Electrochemical measurements show that PAX and Na2S interacted with cyanide-depressed pyrite through different mechanisms.PAX competed with cyanide and was adsorbed on the pyrite surface in the form of dixanthogen,thus enhancing the hydrophobicity and flotation of cyanide-depressed pyrite.Unlike PAX,Na2S rendered the pyrite surface hydrophobic through the reduction of ferricyanide species and the formation of elemental sulfur S0 and polysulfide Sn2-.The combined application of PAX and Na2S induced superior pyrite flotation recovery because of a synergistic effect between PAX and Na2S.
基金financial support of the National High-Tech Research and Development Program of China (No. 2012AA06A118)the Natural Science Foundation of Inner Mongolia (No. 2014MS0521)the Key Science & Technology Development Project of Baotou City (No. 2013Z1016)
文摘To realize the comprehensive utilization of coal-fired industrial solid wastes, a novel high-strength board was prepared from calcium silicate slag, fly ash, and flue gas desulfurization(FGD) gypsum. The changes in mineral phases, chemical structure, and morphology during hydration were investigated by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), and scanning electron microscopy(SEM). A traditional board made from quartz and lime was prepared as a reference. The novel board not only consumes a lot of solid wastes, but also meets the strength requirement of the class-five calcium silicate board according to the Chinese Standard JC/T 564.2—2008. Microanalysis showed that hydrated calcium silicate gel(C-S-H(I)), ettringite, tobermorite, and xonotlite were successively generated in the novel board by synergistic hydration of the mixed solid wastes. The board strength was improved by the formation of tobermorite and xonotlite but decreased by unhydrated quartz. It was demonstrated that quartz was not completely hydrated in the traditional board. As a result, the flexural strength of the traditional board was much lower than that of the novel board.
基金Supported by NSFC(Nos.11971236,11901419)the Foundation in Higher Education Institutions of Henan Province(No.23A110020)。
文摘We introduce and study the relation between Pesin-Pitskel topological pressure on an arbitrary subset and measure theoretic pressure of Borel probability measure for nonautonomous dynamical systems,which is an extension of the classical definition of Bowen topological entropy.We show that the Pesin-Pitskel topological pressure can be determined by the local pressures of measures in nonautonomous case and establish a variational principle for Pesin-Pitskel topological pressure on compact subsets in the context of nonautonomous dynamical systems.
基金supported by the National Key R&D Program of China(No.2021YFC2901000)the Key Program of National Natural Science Foundation of China(No.52130406)+1 种基金the Natural Science Foundation Innovation Group Project of Hubei Province(No.2023AFA044)the Fundamental Research Funds for the Central Universities(No.N2301002)。
文摘The storage of solid waste in Bayan Obo has resulted in significant resource wastage and environmental concerns.In this study,an efficient process was developed to recover iron and rare earth elements(REEs)from this waste by processes of hydrogen-based mineral phase transformation(HMPT),magnetic separation,and flotation.Under optimal HMPT conditions(525℃,12.5 min,and 30%H_(2)concentration),an iron concentrate with a TFe grade of 64.09%and a recovery of 95.33%was obtained.The magnetic properties of the solid waste were greatly enhanced by HMPT,allowing the effective magnetic separation of iron minerals.Further optimization of the flotation process resulted in a REEs concentrate with a rare earth oxide(REO)grade of 65%-70%and a REEs recovery of 60%-65%.Hematite was reduced to magnetite during HMPT,and bastnaesite was decomposed to REEs oxides and fluorides,and the particle structure was significantly destroyed.However,changes in monazite,fluorite,and barite were minimal.
基金Project supported by the National Natural Science Foundation of China(51764045)the Open Project of State Key Laboratory of Mineral Processing(BGRIMM-KJSKL-2020-23)+2 种基金the Excellent Youth Foundation of IMUST(2017YQL05)the Inner Mongolia Natural Science Foundation(2020LH05027,2019MS05039)the Inner Mongolia Major Basic Research Open Project(0406091701)。
文摘Bastnaesite is an important rare earth mineral and is usually beneficiated by flotation.Sodium silicate is commonly used to depress calcium-bearing gangue minerals,however it can also depress bastnaesite when Ca^(2+) ions exist in the pulp.In this study,the effect of Ca^(2+) ions and sodium silicate individually or in combination on bastnaesite flotation was studied through micro-flotation,zeta potential,fluorescence spectroscopy and X-ray photoelectron spectroscopy(XPS) measurements.Micro-flotation results show that the combination of Ca^(2+) ions and sodium silicate depresses bastnaesite more severely due to their synergistic effect.Zeta potential results show that the combination renders the surface potential of bastnaesite negatively shifted more significantly.Fluorescence spectroscopy shows that the combination decreases the surface hydrophobicity of bastnaesite more severely.XPS shows that the combination increases the adsorption of sodium silicate on bastnaesite by forming hydrophilic Ca-SiO_(3) precipitate,which causes more serious depression on bastnaesite flotation.
基金Project supported by the National Key Research and Development Program of China(2019YFC0408300)the Excellent Youth Foundation of IMUST(2017YQL05)+7 种基金the Key Program for International S&T Cooperation Projects of China(2019YFE012999)the Science Fund for Distinguished Young Scholars of Hunan Province(2020JJ2044)the Young Elite Scientists Sponsorship Program of Hunan Province,China(2018RS_(3) 011)Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resourcesthe National Natural Science Foundation of China(U2067201,51774328,51674045,51404300)the National 111Project of China(B14034)Inner Mongolia Natural Science Foundation(2020LH05027,2019MS05039)。
文摘Monazite((Ce,La)PO_(4))is one of the major types of light rare earth minerals from which the light rare earth elements cerium(Ce)and lanthanum(La)are economically extracted.Flotation is extensively used to recover fine-grained monazite.Sodium oleate(NaOL)is considered as the collector with strong collecting ability for monazite flotation.However,this study shows that its collecting ability is still limited.In this paper,a phosphonic acid,nonane-1,1-bisphosphonic acid(C9-BPA),was employed as the novel collector in place of NaOL.Flotation experiments show that even when the C9-BPA dosage is less than one-fifth of the NaOL dosage,the monazite recove ry using C9-BPA as the collector is approximately 22 wt%higher than that using NaOL.The mechanism by which C9-BPA adsorbs on monazite was investigated using zeta potential,infrared(IR)spectroscopy and X-ray photoelectron spectroscopy(XPS)measurements as well as first-principles calculations.Zeta potential measurements show a more significant decrease in the zeta potentials of monazite after the addition of C9-BPA compared to those after the addition of NaOL.For C9-BPA-treated monazite,the characteristic peaks of C9-BPA are observed in the IR and C 1 s XPS spectrum,whereas for monazite treated by NaOL,no characteristic peak of NaOL was observed.Experimental results show that C9-BPA has a stronger affinity towards the monazite surface than NaOL as confirmed by the higher adsorption energy of CP-BPA on the monazite surface(-204.22 kJ/mol)than NaOL(-48.48 kJ/mol).This study demonstrates an extensive application value and prospect of C9-BPA in monazite flotation and helps design novel collectors with strong collecting ability for monazite flotation.
基金the financial support of the National Key Research and Development Program of China(2017YFA0505100)NSF of China(Grants 21974025 and 82121004)for this work.
文摘Asparagine-linked glycosylation protein 1 homolog(ALG1)participates in the initial stage of protein N-glycosylation and N-glycosylation has been implicated in the process of hepatocellular carcinoma(HCC)progression.However,whether ALG1 plays a role in human HCC remains unknown.In this study,the expression profile of ALG1 in tumorous and corresponding adjacent non-tumor tissues was analyzed.The relationship of ALG1 expression with clinical features and prognosis of HCC patients was also evaluated using immuno-histochemical method.Here we found ALG1 decreased in HCC tissues compared with adjacent normal liver tissues,which predicted an unfavorable prognosis.Combined with RNA interference,nascent proteome and glycoproteome were determined systematically in Huh7 cell line.Bioinformatics analysis indicated that the differentially expressed proteins participating in the response of ALG1 knockdown were most significantly associated with cell-cell adhesion.Functional studies confirmed that knockdown of ALG1 reduced cell adhesion capacity,and promoted cell migration.Furthermore,down-regulation of H8N2(on N-glycosite N651)and H5N4S2F1(on N-glycosite N692)from N-cadherin was identified as a feature of ALG1 knockdown.Our findings revealed that ALG1 controlled the expression of glycosylated N-cadherin and played a role in HCC migration,with implications for prognosis.
