With the number of decommissioned electric vehicles increasing annually,a large amount of discarded power battery cathode material is in urgent need of treatment.However,common leaching methods for recovering metal sa...With the number of decommissioned electric vehicles increasing annually,a large amount of discarded power battery cathode material is in urgent need of treatment.However,common leaching methods for recovering metal salts are economically inefficient and polluting.Meanwhile,the recycled material obtained by lithium remediation alone has limited performance in cycling stability.Herein,a short method of solid-phase reduction is developed to recover spent LiFePO4 by simultaneously introducing Mg2+ions for hetero-atom doping.Issues of particle agglomeration,carbon layer breakage,lithium loss,and Fe3+defects in spent LiFePO4 are also addressed.Results show that Mg2+addition during regeneration can remarkably enhance the crystal structure stability and improve the Li+diffusion coefficient.The regenerated LiFePO4 exhibits significantly improved electrochemical performance with a specific discharge capacity of 143.2 mAh·g^(−1)at 0.2 C,and its capacity retention is extremely increased from 37.9%to 98.5%over 200 cycles at 1 C.Especially,its discharge capacity can reach 95.5 mAh·g^(−1)at 10 C,which is higher than that of spent LiFePO4(55.9 mAh·g^(−1)).All these results show that the proposed regeneration strategy of simultaneous carbon coating and Mg2+doping is suitable for the efficient treatment of spent LiFePO4.展开更多
BACKGROUND Epidemiological studies have found that unconjugated bilirubin(UCB)levels are positively correlated with the incidence of colorectal cancer(CRC).Therefore,bilirubin may also play an important role in the pr...BACKGROUND Epidemiological studies have found that unconjugated bilirubin(UCB)levels are positively correlated with the incidence of colorectal cancer(CRC).Therefore,bilirubin may also play an important role in the prognosis of CRC.AIM To investigate the predictive value of total bilirubin(TBIL)and UCB in the prognosis of patients with CRC.METHODS A total of 142 CRC patients were selected as the research subjects in Jingxian Hospital,from October 2014 to May 2021.General and tumour-related clinical data at admission and the overall survival at 3 years after surgery were collected.The optimal cut-off values of TBIL and UCB were determined by receiver operating characteristic curve analysis.Univariate and multivariate Cox regression were used to analyse the effect of bilirubin level on the survival of CRC patients.The Kaplan–Meier method was used to assess the survival time.RESULTS The 3-year overall survival rate of CRC patients was significantly higher in the high TBIL(>13.45μmol/L)group than in the low TBIL(≤13.45μmol/L)group(76.4%vs 37.1%;P<0.05).The 3-year overall survival rate of CRC patients in the high UCB(>10.75μmol/L)group was significantly higher than that in the low UCB(≤10.75μmol/L)group(83.3%vs 34.2%;P<0.05).Multivariate Cox regression analysis showed that higher TBIL levels were an independent predictor of better prognosis in CRC patients(hazard ratio=0.360,95%confidence interval:0.159-0.812,P=0.014).CONCLUSION TBIL levels can be used as a prognostic indicator for CRC patients.展开更多
The surface functional groups and pyrolysis characteristics of lignite irradiated by microwave were comparatively studied to evaluate the feasibility of using industrial 915 MHz for lignite drying. The drying kinetics...The surface functional groups and pyrolysis characteristics of lignite irradiated by microwave were comparatively studied to evaluate the feasibility of using industrial 915 MHz for lignite drying. The drying kinetics, micro structure, chemical functional groups, re-adsorption properties, and pyrolysis characteristics of the dried coal were respectively analyzed. Results indicated that for typical Chinese lignite studied in this paper, 915 MHz microwave drying was 7.8 times faster than that of the hot air drying. After industrial microwave drying, the sample possessed much higher total specific surface area and specific pore volume than that of air dried sample. The oxygen functional groups and re-adsorption ratio of microwave irradiated coal decreased, showing weakened hydrophilicity. Moreover, during the pyrolysis of the coal dried by hot air and microwave, the yield of tar largely increased from 1.3% to 8.5% and the gas production increased correspondingly. The composition of the tar was also furtherly analyzed, results indicated that Miscellaneous hydrocarbons(HCs) were the main component of the tar, and microwave irradiation can reduce the fraction of polycyclic aromatic hydrocarbons(PAHs) from 26.4% to 22.7%.展开更多
Novel branched silicone methacrylate was developed.The mechanical and biological properties of the resin system were investigated to select the formula proportion with the best overall performance.The novel silicone-c...Novel branched silicone methacrylate was developed.The mechanical and biological properties of the resin system were investigated to select the formula proportion with the best overall performance.The novel silicone-containing monomers were combined with an incremental sequence of glass filler concentrations in commonly used Bis-GMA/TEGDMA(50/50,wt./wt.)dental resin systems.Physicochemical properties,surface properties,antibacterial adhesion effect,anti-biofilm effect,protein adsorption,and cytotoxicity were evaluated.The results showed that BSMs did not affect the double bond conversion of dental resin,but could reduce volumetric shrinkage(p<0.05).The BSM containing resins can resist protein and bacteria adhesion(S.mutans)because it has increased hydrophobicity and a lower free energy surface(p<0.05).However,there were no statistically significant differences in cytotoxicity,surface roughness,and double bond conversion rate.Overall,the results indicate that changes in a material’s properties are not strictly proportional to its composition.Synthetic silicone resin methacrylate can reduce the polymerization shrinkage,have low surface energy and anti-adhesion properties.Silicone composite resin containing 70%matrix has the best comprehensive properties.The silicone methacrylate composite represents an innovative method to improve the properties and reducing secondary caries.展开更多
The multi-messenger observation of coalescing compact binary systems promises great scientific treasure.However,synthesising observations from both gravitational wave and electromagnetic channels remains challenging.I...The multi-messenger observation of coalescing compact binary systems promises great scientific treasure.However,synthesising observations from both gravitational wave and electromagnetic channels remains challenging.In the context of the day-to-week long emission from a macronova,the binary neutron star merger GW170817 remains the only event with successful electromagnetic followup.In this manuscript,we explore the possibility of using the early stage X-ray afterglow to search for the electromagnetic counterpart of a gravitational wave event.Two algorithms,the simple and straightforward sequential observation(SO)and the step-wise optimizing local optimization are considered and applied to some simulated events.We consider the WXT from the proposed Einstein Probe as a candidate X-ray telescope,which has a very wide field of view of 3600 deg^(2).Benefiting from the large field of view and high sensitivity,we find that the SO algorithm not only is easy to implement,but also promises a good chance of actual detection.展开更多
Soil secondary minerals are important scavengers of rare earth elements(REEs) in soils and thus affect geochemical behavior and occurrence of REEs. The fractionation of REEs is a common geochemical phenomenon in soils...Soil secondary minerals are important scavengers of rare earth elements(REEs) in soils and thus affect geochemical behavior and occurrence of REEs. The fractionation of REEs is a common geochemical phenomenon in soils but has received little attention, especially fractionation induced by secondary minerals. In this study, REEs(La to Lu and Y) associated with soil-abundant secondary minerals Fe-, Al-, and Mn-oxides in 196 soil samples were investigated to explore the fractionation and anomalies of REEs related to the minerals. The results show right-inclined chondrite-normalized REE patterns for La–Lu in soils subjected to total soil digestion and partial soil extraction. Light REEs(LREEs) enrichment features were negatively correlated with a Eu anomaly and positively correlated with a Ce anomaly. The fractionation between LREEs and heavy REEs(HREEs) was attributed to the high adsorption affinity of LREEs to secondary minerals and the preferred activation/leaching of HREEs.The substantial fractions of REEs in soils extracted byoxalate and Dithionite-Citrate-Bicarbonate buffer solutions were labile(10 %–30 %), which were similar to the mass fraction of Fe(10 %–20 %). Furthermore, Eu was found to be more mobile than the other REEs in the soils, whereas Ce was less mobile. These results add to our understanding of the distribution and geochemical behavior of REEs in soils, and also help to deduce the conditions of soil formation from REE fractionation.展开更多
Scorodite (FeAsO_(4)·H_(2)O) is a common arsenic-bearing (As-bearing) iron mineral in nearsurface environments that could immobilize or store As in a bound state.In flooded soils,microbe induced Fe(Ⅲ) or As(Ⅴ) ...Scorodite (FeAsO_(4)·H_(2)O) is a common arsenic-bearing (As-bearing) iron mineral in nearsurface environments that could immobilize or store As in a bound state.In flooded soils,microbe induced Fe(Ⅲ) or As(Ⅴ) reduction can increase the mobility and bioavailability of As.Additionally,humic substances can act as electron shuttles to promote this process.The dynamics of As release and diversity of putative As(Ⅴ)-reducing bacteria during scorodite reduction have yet to be investigated in detail in flooded soils.Here,the microbial reductive dissolution of scorodite was conducted in an flooded soil in the presence of anthraquinone-2,6-disulfonate (AQDS).Anaeromyxobacter,Dechloromonas,Geothrix,Geobacter,Ideonella,and Zoogloea were found to be the dominant indigenous bacteria during Fe(Ⅲ) and As(Ⅴ) reduction.AQDS increased the relative abundance of dominant species,but did not change the diversity and microbial community of the systems with scorodite.Among these bacteria,Geobacter exhibited the greatest increase and was the dominant Fe(Ⅲ)-and As(Ⅴ)-reducing bacteria during the incubation with AQDS and scorodite.AQDS promoted both Fe(Ⅲ) and As(Ⅴ) reduction,and over 80%of released As(Ⅴ) was microbially transformed to As(Ⅲ).The increases in the abundance of arrA gene and putative arrA sequences of Geobacter were higher with AQDS than without AQDS.As a result,the addition of AQDS promoted microbial Fe(Ⅲ) and As(Ⅴ) release and reduction from As-bearing iron minerals into the environment.These results contribute to exploration of the transformation of As from As-bearing iron minerals under anaerobic conditions,thus providing insights into the bioremediation of As-contaminated soil.展开更多
Polycrystalline Ni-rich layered oxide (Li Ni_(x)Co_(y)Mn_zO_(2)(NCM),x>0.8) cathode material with high specific capacity and low cost is considered as one of the most promising candidate materials for lithium-ion b...Polycrystalline Ni-rich layered oxide (Li Ni_(x)Co_(y)Mn_zO_(2)(NCM),x>0.8) cathode material with high specific capacity and low cost is considered as one of the most promising candidate materials for lithium-ion batteries (LIBs).However,it suffers from severe structural and capacity degradation during practical cycling,especially under harsh operation condition(ultrahigh cutoff voltage and elevated temperature,etc.).One promising approach to mitigate these issues is to develop a single-crystal Ni-rich NCM cathode,which could enhance structural integrity and improve capacity retention,due to its robust and stable micro-sized primary particles.However,the improved cyclic stability comes at the expense of reversible capacity and rate capability,owing to the relatively low Li^(+) diffusion efficiency for its micron-sized primary particles.Moreover,the structural degradation and exacerbation of interfacial reactions for the Ni-rich NCM cathode under highvoltage (≥4.5 V) would quickly trigger the poor electrochemical performance,limiting its practical applications.Herein,Li Ni_(0.827)Co_(0.11)Zr_(0.003)Mn_(0.06)O_(2)(Zr@SC-N_(83)) cathode material was successfully synthesized via the in situ doping strategy.It could not only effectively maintain the reversibility of phase transition between H2 and H3 after long-term cycling at high voltage (4.6 V),but also enhance lithium-ion diffusion,thus improving the cycling performance and good rate performance for the Zr@SC-N_(83)cathode.As a result,0.3 wt%Zrdoping cathode delivers an initial discharging capacity of 200.1 m Ah·g^(-1)at 1.0C and at the high cutoff voltage of 4.6 V,exhibiting the satisfactory capacity retention of 85.5%after 100cycles.It provides an effective route toward low-cost and higher energy density for lithium-ion batteries with Ni-rich cathode.展开更多
A novel description of the strongly interacting pure neutron matter(PNM)was carried out by the relativistic Brueckner-HartreeFock(RBHF)theory in the full Dirac space with Bonn A potential.The scalar and vector compone...A novel description of the strongly interacting pure neutron matter(PNM)was carried out by the relativistic Brueckner-HartreeFock(RBHF)theory in the full Dirac space with Bonn A potential.The scalar and vector components of the single-particle potentials are shown as functions of the momentum and the density,and are compared with the results obtained by the RBHF calculations in the Dirac space without negative-energy states.By benchmarking the binding energies of PNM to those predicted by several ab initio methods in the nonrelativistic framework with two-and three-body forces,we find our results are softer than those from the Brueckner-Hartree-Fock theory with the inclusion of three-body force,and in harmony with the ones obtained by the Monte Carlo method and many-body perturbation theory within uncertainties.In addition,the equation of state for neutron star matter is consistent with the constraints from multi-messenger astrophysical observation and heavy-ion collision experiments.The tidal deformabilities of a binary neutron star system are calculated and found consistent with the constraints from GW170817.展开更多
Histone deacetylase 3 (HDAC3) is a major HDAC, whose enzymatic activity is targeted by small molecule inhibitors for treating a variety of conditions. However, its enzymatic activity is largely dispensable for its fun...Histone deacetylase 3 (HDAC3) is a major HDAC, whose enzymatic activity is targeted by small molecule inhibitors for treating a variety of conditions. However, its enzymatic activity is largely dispensable for its function in embryonic development and hepatic lipid metabolism.HDAC3 plays a pivotal role in regulating muscle fuel metabolism and contractile function. Here, we address whether these muscular functions of HDAC3 require its enzymatic activity. By mutating the NCoR/SMRT corepressors in a knock - in mouse model named NS-DADm, we ablated the enzymatic activity of HDAC3 without affecting its protein levels. Compared to the control mice, skeletal muscles from NS-DADm mice showed lower force generation, enhanced fatigue resistance, enhanced fatty acid oxidation, reduced glucose uptake during exercise, upregulated expression of metabolic genes involved in branchedchain amino acids catabolism, and reduced muscle mass during aging, without changes in the muscle fiber-type composition or mitochondrial protein content. These muscular phenotypes are similar to those observed in the HDAC3-depleted skeletal muscles, which demonstrates that, unlike that in the liver or embryonic development, the metabolic function of HDAC3 in skeletal muscles requires its enzymatic activity. These results suggest that drugs specifically targeting HDAC3 enzyme activity could be developed and tested to modulate muscle energy metabolism and exercise performance.展开更多
In this paper, we introduce an iterative method for finding a common element of the set of solutions of an equilibrium problem, the set of common fixed points of two asymptotically nonexpansive mappings in a Hilbert s...In this paper, we introduce an iterative method for finding a common element of the set of solutions of an equilibrium problem, the set of common fixed points of two asymptotically nonexpansive mappings in a Hilbert space. We show that the iterative sequence converges strongly to a common element of the two sets.展开更多
Dissipative solitons have been realized in mode-locked fiber lasers in the theoretical framework of the Ginzburg±Landau equation and have significantly improved the pulse energy and peak power levels of such lase...Dissipative solitons have been realized in mode-locked fiber lasers in the theoretical framework of the Ginzburg±Landau equation and have significantly improved the pulse energy and peak power levels of such lasers.It is interesting to explore whether dissipative solitons exist in optical parametric oscillators in the framework of three-wave coupling equations in order to substantially increase the performance of optical parametric oscillators.Here,we demonstrate a temporalfiltering dissipative soliton in a synchronously pumped optical parametric oscillator.The temporal-gain filtering of the pump pulse combined with strong cascading nonlinearity and dispersion in the optical parametric oscillator enables the generation of a broad spectrum with a nearly linear chirp;consequently,a significantly compressed pulse and high peak power can be realized after dechirping outside the cavity.Furthermore,we realized,for the first time,dissipative solitons in an optical system with a negative nonlinear phase shift and anomalous dispersion,extending the parameter region of dissipative solitons.The findings may open a new research block for dissipative solitons and provide new opportunities for mid-infrared ultrafast science.展开更多
基金supported by the Science and Technology Innovation Program of Hunan Province(No.2020SK2007)the Natural Science Foundation of Hunan Province(No.2019JJ50814)+2 种基金the Fundamental Research Funds for the Central Universities of Central South University(No.1053320211765)the Science and Technology Planning Project of Guangdong Province of China(No.2017B030314046)Guangdong Academy of Sciences for Innovation Capacity Building(No.2016GDASRC0201).
文摘With the number of decommissioned electric vehicles increasing annually,a large amount of discarded power battery cathode material is in urgent need of treatment.However,common leaching methods for recovering metal salts are economically inefficient and polluting.Meanwhile,the recycled material obtained by lithium remediation alone has limited performance in cycling stability.Herein,a short method of solid-phase reduction is developed to recover spent LiFePO4 by simultaneously introducing Mg2+ions for hetero-atom doping.Issues of particle agglomeration,carbon layer breakage,lithium loss,and Fe3+defects in spent LiFePO4 are also addressed.Results show that Mg2+addition during regeneration can remarkably enhance the crystal structure stability and improve the Li+diffusion coefficient.The regenerated LiFePO4 exhibits significantly improved electrochemical performance with a specific discharge capacity of 143.2 mAh·g^(−1)at 0.2 C,and its capacity retention is extremely increased from 37.9%to 98.5%over 200 cycles at 1 C.Especially,its discharge capacity can reach 95.5 mAh·g^(−1)at 10 C,which is higher than that of spent LiFePO4(55.9 mAh·g^(−1)).All these results show that the proposed regeneration strategy of simultaneous carbon coating and Mg2+doping is suitable for the efficient treatment of spent LiFePO4.
文摘BACKGROUND Epidemiological studies have found that unconjugated bilirubin(UCB)levels are positively correlated with the incidence of colorectal cancer(CRC).Therefore,bilirubin may also play an important role in the prognosis of CRC.AIM To investigate the predictive value of total bilirubin(TBIL)and UCB in the prognosis of patients with CRC.METHODS A total of 142 CRC patients were selected as the research subjects in Jingxian Hospital,from October 2014 to May 2021.General and tumour-related clinical data at admission and the overall survival at 3 years after surgery were collected.The optimal cut-off values of TBIL and UCB were determined by receiver operating characteristic curve analysis.Univariate and multivariate Cox regression were used to analyse the effect of bilirubin level on the survival of CRC patients.The Kaplan–Meier method was used to assess the survival time.RESULTS The 3-year overall survival rate of CRC patients was significantly higher in the high TBIL(>13.45μmol/L)group than in the low TBIL(≤13.45μmol/L)group(76.4%vs 37.1%;P<0.05).The 3-year overall survival rate of CRC patients in the high UCB(>10.75μmol/L)group was significantly higher than that in the low UCB(≤10.75μmol/L)group(83.3%vs 34.2%;P<0.05).Multivariate Cox regression analysis showed that higher TBIL levels were an independent predictor of better prognosis in CRC patients(hazard ratio=0.360,95%confidence interval:0.159-0.812,P=0.014).CONCLUSION TBIL levels can be used as a prognostic indicator for CRC patients.
基金Supported by the National Natural Science Foundation of China(51621005)the Fundamental Research Funds for the Central Universities(2017FZA4013)
文摘The surface functional groups and pyrolysis characteristics of lignite irradiated by microwave were comparatively studied to evaluate the feasibility of using industrial 915 MHz for lignite drying. The drying kinetics, micro structure, chemical functional groups, re-adsorption properties, and pyrolysis characteristics of the dried coal were respectively analyzed. Results indicated that for typical Chinese lignite studied in this paper, 915 MHz microwave drying was 7.8 times faster than that of the hot air drying. After industrial microwave drying, the sample possessed much higher total specific surface area and specific pore volume than that of air dried sample. The oxygen functional groups and re-adsorption ratio of microwave irradiated coal decreased, showing weakened hydrophilicity. Moreover, during the pyrolysis of the coal dried by hot air and microwave, the yield of tar largely increased from 1.3% to 8.5% and the gas production increased correspondingly. The composition of the tar was also furtherly analyzed, results indicated that Miscellaneous hydrocarbons(HCs) were the main component of the tar, and microwave irradiation can reduce the fraction of polycyclic aromatic hydrocarbons(PAHs) from 26.4% to 22.7%.
基金This work was funded by the National Natural Science Foundation of China(Nos.81970974,82071162)Guangdong Financial Fund for High-Caliber Hospital Construction(174-2018-XMZC-0001-03-0125/D-15).
文摘Novel branched silicone methacrylate was developed.The mechanical and biological properties of the resin system were investigated to select the formula proportion with the best overall performance.The novel silicone-containing monomers were combined with an incremental sequence of glass filler concentrations in commonly used Bis-GMA/TEGDMA(50/50,wt./wt.)dental resin systems.Physicochemical properties,surface properties,antibacterial adhesion effect,anti-biofilm effect,protein adsorption,and cytotoxicity were evaluated.The results showed that BSMs did not affect the double bond conversion of dental resin,but could reduce volumetric shrinkage(p<0.05).The BSM containing resins can resist protein and bacteria adhesion(S.mutans)because it has increased hydrophobicity and a lower free energy surface(p<0.05).However,there were no statistically significant differences in cytotoxicity,surface roughness,and double bond conversion rate.Overall,the results indicate that changes in a material’s properties are not strictly proportional to its composition.Synthetic silicone resin methacrylate can reduce the polymerization shrinkage,have low surface energy and anti-adhesion properties.Silicone composite resin containing 70%matrix has the best comprehensive properties.The silicone methacrylate composite represents an innovative method to improve the properties and reducing secondary caries.
基金Guangdong Major Project of Basic and Applied Basic Research(Contract No.2019B030302001)the National Natural Science Foundation of China(Grant No.11703098)+3 种基金support by the Strategic Pioneer Program on Space Science,Chinese Academy of Sciences(grant Nos.XDA15052100,XDA15310300)the Strategic Priority Research Program of the Chinese Academy of Sciences(grant No.XDB23040100)supported by the Science and Technology Facilities Council(Grant No.ST/L000946/1)funded by the Science and Technology Facilities Council UK grant no.ST/R002770/1。
文摘The multi-messenger observation of coalescing compact binary systems promises great scientific treasure.However,synthesising observations from both gravitational wave and electromagnetic channels remains challenging.In the context of the day-to-week long emission from a macronova,the binary neutron star merger GW170817 remains the only event with successful electromagnetic followup.In this manuscript,we explore the possibility of using the early stage X-ray afterglow to search for the electromagnetic counterpart of a gravitational wave event.Two algorithms,the simple and straightforward sequential observation(SO)and the step-wise optimizing local optimization are considered and applied to some simulated events.We consider the WXT from the proposed Einstein Probe as a candidate X-ray telescope,which has a very wide field of view of 3600 deg^(2).Benefiting from the large field of view and high sensitivity,we find that the SO algorithm not only is easy to implement,but also promises a good chance of actual detection.
基金funded by the National Natural Science Foundation of China(41420104007,41330857,and 41673135)the Guangdong Natural Science Foundation of China(S2013050014266)the One Hundred Talents Programme of The Chinese Academy of Sciences
文摘Soil secondary minerals are important scavengers of rare earth elements(REEs) in soils and thus affect geochemical behavior and occurrence of REEs. The fractionation of REEs is a common geochemical phenomenon in soils but has received little attention, especially fractionation induced by secondary minerals. In this study, REEs(La to Lu and Y) associated with soil-abundant secondary minerals Fe-, Al-, and Mn-oxides in 196 soil samples were investigated to explore the fractionation and anomalies of REEs related to the minerals. The results show right-inclined chondrite-normalized REE patterns for La–Lu in soils subjected to total soil digestion and partial soil extraction. Light REEs(LREEs) enrichment features were negatively correlated with a Eu anomaly and positively correlated with a Ce anomaly. The fractionation between LREEs and heavy REEs(HREEs) was attributed to the high adsorption affinity of LREEs to secondary minerals and the preferred activation/leaching of HREEs.The substantial fractions of REEs in soils extracted byoxalate and Dithionite-Citrate-Bicarbonate buffer solutions were labile(10 %–30 %), which were similar to the mass fraction of Fe(10 %–20 %). Furthermore, Eu was found to be more mobile than the other REEs in the soils, whereas Ce was less mobile. These results add to our understanding of the distribution and geochemical behavior of REEs in soils, and also help to deduce the conditions of soil formation from REE fractionation.
基金supported by the National Science Foundation of China(Nos.41977291 and 42177238)the Science and Technology Foundation of Guangdong,China (Nos.2019A1515011482 and2022A1515011093)+2 种基金the Strategic Priority Research Program (No.XDB40020300)the GDAS’Project of Science and Technology Development (Nos.2019GDASYL-0102002-5 and2020GDASYL-20200103077)Light of West China of Chinese Academy of Sciences。
文摘Scorodite (FeAsO_(4)·H_(2)O) is a common arsenic-bearing (As-bearing) iron mineral in nearsurface environments that could immobilize or store As in a bound state.In flooded soils,microbe induced Fe(Ⅲ) or As(Ⅴ) reduction can increase the mobility and bioavailability of As.Additionally,humic substances can act as electron shuttles to promote this process.The dynamics of As release and diversity of putative As(Ⅴ)-reducing bacteria during scorodite reduction have yet to be investigated in detail in flooded soils.Here,the microbial reductive dissolution of scorodite was conducted in an flooded soil in the presence of anthraquinone-2,6-disulfonate (AQDS).Anaeromyxobacter,Dechloromonas,Geothrix,Geobacter,Ideonella,and Zoogloea were found to be the dominant indigenous bacteria during Fe(Ⅲ) and As(Ⅴ) reduction.AQDS increased the relative abundance of dominant species,but did not change the diversity and microbial community of the systems with scorodite.Among these bacteria,Geobacter exhibited the greatest increase and was the dominant Fe(Ⅲ)-and As(Ⅴ)-reducing bacteria during the incubation with AQDS and scorodite.AQDS promoted both Fe(Ⅲ) and As(Ⅴ) reduction,and over 80%of released As(Ⅴ) was microbially transformed to As(Ⅲ).The increases in the abundance of arrA gene and putative arrA sequences of Geobacter were higher with AQDS than without AQDS.As a result,the addition of AQDS promoted microbial Fe(Ⅲ) and As(Ⅴ) release and reduction from As-bearing iron minerals into the environment.These results contribute to exploration of the transformation of As from As-bearing iron minerals under anaerobic conditions,thus providing insights into the bioremediation of As-contaminated soil.
基金financially supported by the National Natural Science Foundation of China (NSFC, No. 52204328)the Natural Science Foundation of Hunan Province (No. 2022JJ40595)+2 种基金the Scientific Research Fund of Hunan Provincial Education Department (No. 22C0383)China Postdoctoral Science Foundation (No. 2022M713547)the Science and Technology Innovation Program of Hunan Province (No. 2020SK2007)。
文摘Polycrystalline Ni-rich layered oxide (Li Ni_(x)Co_(y)Mn_zO_(2)(NCM),x>0.8) cathode material with high specific capacity and low cost is considered as one of the most promising candidate materials for lithium-ion batteries (LIBs).However,it suffers from severe structural and capacity degradation during practical cycling,especially under harsh operation condition(ultrahigh cutoff voltage and elevated temperature,etc.).One promising approach to mitigate these issues is to develop a single-crystal Ni-rich NCM cathode,which could enhance structural integrity and improve capacity retention,due to its robust and stable micro-sized primary particles.However,the improved cyclic stability comes at the expense of reversible capacity and rate capability,owing to the relatively low Li^(+) diffusion efficiency for its micron-sized primary particles.Moreover,the structural degradation and exacerbation of interfacial reactions for the Ni-rich NCM cathode under highvoltage (≥4.5 V) would quickly trigger the poor electrochemical performance,limiting its practical applications.Herein,Li Ni_(0.827)Co_(0.11)Zr_(0.003)Mn_(0.06)O_(2)(Zr@SC-N_(83)) cathode material was successfully synthesized via the in situ doping strategy.It could not only effectively maintain the reversibility of phase transition between H2 and H3 after long-term cycling at high voltage (4.6 V),but also enhance lithium-ion diffusion,thus improving the cycling performance and good rate performance for the Zr@SC-N_(83)cathode.As a result,0.3 wt%Zrdoping cathode delivers an initial discharging capacity of 200.1 m Ah·g^(-1)at 1.0C and at the high cutoff voltage of 4.6 V,exhibiting the satisfactory capacity retention of 85.5%after 100cycles.It provides an effective route toward low-cost and higher energy density for lithium-ion batteries with Ni-rich cathode.
基金supported by the National Natural Science Foundation of China(Grant Nos.12205030,12147102,and 12265012)Guizhou Provincial Science and Technology Projects(Grant No.ZK[2022]203)+4 种基金Construction Project of Characteristic Key Laboratory in Guizhou Colleges and Universities(Grant No.KY[2021]003)Key Laboratory of Guizhou Minzu University(Grant No.GZMUSYS[2021]03)Fundamental Research Funds for the Central Universities(Grant Nos.2020CDJQY-Z003,and 2021CDJZYJH-003)MOST-RIKEN Joint Project“Ab initio investigation in nuclear physics”the supercomputer OCTOPUS at the Cybermedia Center,Osaka University under the support of the Research Center for Nuclear Physics of Osaka University。
文摘A novel description of the strongly interacting pure neutron matter(PNM)was carried out by the relativistic Brueckner-HartreeFock(RBHF)theory in the full Dirac space with Bonn A potential.The scalar and vector components of the single-particle potentials are shown as functions of the momentum and the density,and are compared with the results obtained by the RBHF calculations in the Dirac space without negative-energy states.By benchmarking the binding energies of PNM to those predicted by several ab initio methods in the nonrelativistic framework with two-and three-body forces,we find our results are softer than those from the Brueckner-Hartree-Fock theory with the inclusion of three-body force,and in harmony with the ones obtained by the Monte Carlo method and many-body perturbation theory within uncertainties.In addition,the equation of state for neutron star matter is consistent with the constraints from multi-messenger astrophysical observation and heavy-ion collision experiments.The tidal deformabilities of a binary neutron star system are calculated and found consistent with the constraints from GW170817.
文摘Histone deacetylase 3 (HDAC3) is a major HDAC, whose enzymatic activity is targeted by small molecule inhibitors for treating a variety of conditions. However, its enzymatic activity is largely dispensable for its function in embryonic development and hepatic lipid metabolism.HDAC3 plays a pivotal role in regulating muscle fuel metabolism and contractile function. Here, we address whether these muscular functions of HDAC3 require its enzymatic activity. By mutating the NCoR/SMRT corepressors in a knock - in mouse model named NS-DADm, we ablated the enzymatic activity of HDAC3 without affecting its protein levels. Compared to the control mice, skeletal muscles from NS-DADm mice showed lower force generation, enhanced fatigue resistance, enhanced fatty acid oxidation, reduced glucose uptake during exercise, upregulated expression of metabolic genes involved in branchedchain amino acids catabolism, and reduced muscle mass during aging, without changes in the muscle fiber-type composition or mitochondrial protein content. These muscular phenotypes are similar to those observed in the HDAC3-depleted skeletal muscles, which demonstrates that, unlike that in the liver or embryonic development, the metabolic function of HDAC3 in skeletal muscles requires its enzymatic activity. These results suggest that drugs specifically targeting HDAC3 enzyme activity could be developed and tested to modulate muscle energy metabolism and exercise performance.
基金Supported by National Natural Science Foundation of China (Grant No. 10971045)
文摘In this paper, we introduce an iterative method for finding a common element of the set of solutions of an equilibrium problem, the set of common fixed points of two asymptotically nonexpansive mappings in a Hilbert space. We show that the iterative sequence converges strongly to a common element of the two sets.
基金the National Natural Science Foundation of China(Nos.61675130,62075126 and 91850203)。
文摘Dissipative solitons have been realized in mode-locked fiber lasers in the theoretical framework of the Ginzburg±Landau equation and have significantly improved the pulse energy and peak power levels of such lasers.It is interesting to explore whether dissipative solitons exist in optical parametric oscillators in the framework of three-wave coupling equations in order to substantially increase the performance of optical parametric oscillators.Here,we demonstrate a temporalfiltering dissipative soliton in a synchronously pumped optical parametric oscillator.The temporal-gain filtering of the pump pulse combined with strong cascading nonlinearity and dispersion in the optical parametric oscillator enables the generation of a broad spectrum with a nearly linear chirp;consequently,a significantly compressed pulse and high peak power can be realized after dechirping outside the cavity.Furthermore,we realized,for the first time,dissipative solitons in an optical system with a negative nonlinear phase shift and anomalous dispersion,extending the parameter region of dissipative solitons.The findings may open a new research block for dissipative solitons and provide new opportunities for mid-infrared ultrafast science.
