The Spitzer Extended Deep Survey(SEDS)as a deep and wide mid-infrared(MIR)survey project provides a sample of 500000+sources spreading 1.46 square degree and a depth of 26 AB mag(3σ).Combining with the previous avail...The Spitzer Extended Deep Survey(SEDS)as a deep and wide mid-infrared(MIR)survey project provides a sample of 500000+sources spreading 1.46 square degree and a depth of 26 AB mag(3σ).Combining with the previous available data,we build a PSF-matched multi-wavelength photometry catalog from u band to 8μm.We fit the SEDS galaxies spectral energy distributions by the local galaxy templates.The results show that the SEDS galaxy can be fitted well,indicating the high redshift galaxy(z~1)shares the same templates with the local galaxies.This study would facilitate the further study of the galaxy luminosity and high redshift mass function.展开更多
How low surface brightness galaxies(LSBGs)form stars and assemble stellar mass is one of the most important questions related to understanding the LSBG population.We select a sample of 381 HI bright LSBGs with both fa...How low surface brightness galaxies(LSBGs)form stars and assemble stellar mass is one of the most important questions related to understanding the LSBG population.We select a sample of 381 HI bright LSBGs with both far ultraviolet(FUV)and near infrared(NIR)observations to investigate the star formation rate(SFR)and stellar mass scales,and the growth mode.We measure the FUV and NIR radii of our sample,which represent the star-forming and stellar mass distribution scales respectively.We also compare the FUV and H band radius-stellar mass relation with archival data,to identify the SFR and stellar mass structure difference between the LSBG population and other galaxies.Since galaxy HI mass has a tight correlation with the HI radius,we can also compare the HI and FUV radii to understand the distribution of HI gas and star formation activities.Our results show that most of the HI selected LSBGs have extended star formation structure.The stellar mass distribution of LSBGs may have a similar structure to disk galaxies at the same stellar mass bins,but the star-forming activity of LSBGs happens at a larger radius than the high surface density galaxies,which may help to identify the LSBG sample from the wide-field deep u band image survey.The HI is also distributed at larger radii,implying a steeper(or not)Kennicutt-Schmidt relation for LSBGs.展开更多
Exploring the physiochemical properties and expanding the applications of actinide-containing materials is paramount to address the escalating challenge of radioactive waste accumulation.However,unlocking the full pot...Exploring the physiochemical properties and expanding the applications of actinide-containing materials is paramount to address the escalating challenge of radioactive waste accumulation.However,unlocking the full potential of these materials is largely crippled by the radiotoxicity of the actinides.We report here two porous and luminescent thorium-based metal-organic frameworks(Th-BITD-1 and Th-BITD-2)that serve as a bifunctional platform for sequencing and sensing of radioiodine,a much more radioactive fission product discharged during the nuclear fuel reprocessing.In particular,Th-BITD-1 displays better iodine uptake performance than Th-BITD-2 via the solution-based process and vapor diffusion with the maximum adsorption capacities of 831 and 1099 mg/g,respectively.Fur thermore,Th-BITD-1 can function as a highly sensitive luminescence sensor for iodate with a quenching constant(Ksv)of 6.6(5)×10^(3) M^(-1)and a detection limit of 2.02μM,respectively,outperforming 2.96(6)×10^(3)M^(-1)and 10.5μM of Th-BITD-2.Moreover,a positive correlation between the sensing efficacy and the iodate adsorption capacity has been revealed.This work highlights the opportunity in designing novel actinide-based MOFs for their potential applications in radiological fields,e.g.,radionuclide separation and detection.展开更多
Self-healing polymers based on dynamic crosslinkers have drawn rapidly increasing interest over the last decade.Here,a self-healable epoxy network with exchangeable disulfide bonds was synthesized by polymerizing two ...Self-healing polymers based on dynamic crosslinkers have drawn rapidly increasing interest over the last decade.Here,a self-healable epoxy network with exchangeable disulfide bonds was synthesized by polymerizing two epoxies with an aromatic amine containing a disulfide bond.The bisphenol A diglycidyl ether(DGEBA)and poly(ethylene glycol)diglycidyl ether(DER736)were used as rigid and soft components,respectively.The crosslinking densities of studied polymers decreased with the increasing amount of DER736,resulting in the lower glassy temperature and weaker mechanical strength.The dynamic covalent network character of disulfide bond and its low active energy were also investigated through stress relaxation experiments at various temperatures.The self-healing performance of healable epoxy resins with varied flexibility was measured by tensile tests.The tensile strength of a full-cut sample was restored to 84%(13 MPa)of the initial values(16 MPa)at moderate temperature.Its healed fracture strain was up to 505%.Moreover,the effect of healing time and temperature on the self-healing properties was also studied.A model was proposed to investigate the self-repairing efficiency evolution with healing time,suggesting that hydrogen bonds mainly contributed to the initial sticking or interfacial adhesion while disulfide links and chain interdiffusion assisted time dependent reformation of networks to restore the original mechanical strength.展开更多
Background: Currently, various calculation methods for evaluating blood-loss in patients with total knee arthroplasty (TKA) are applied in clinical practice. However, different methods may yield different results. ...Background: Currently, various calculation methods for evaluating blood-loss in patients with total knee arthroplasty (TKA) are applied in clinical practice. However, different methods may yield different results. The purpose of this study was to determine the most reliable method for calculating blood-loss after primary TKA. Methods: We compared blood-loss in 245 patients who underwent primary unilateral TKA from February 2010 to August 2011. We calculated blood-loss using four methods: Gross equation, hemoglobin (Hb) balance, the Orthopedic Surgery Transfusion Hemoglobin European Overview (OSTHEO) formula, and Hb-dilution. We determined Pearson's correlation coefficients for the four methods. Results: There were large differences in the calculated blood-loss obtained by the four methods. In descending order of combined correlation coefficient based on calculated blood-loss, the methods were Hb-balance, OSTHEO formula, Hb-dilution, and Gross equation. Conclusions: The Hb-balance method may be the most reliable method of estimating blood-loss after TKA.展开更多
Background: Total knee arthroplasty (TKA) is the most frequently performed procedure in treating advanced knee osteoarthritis. Excessive perioperative blood loss can sometimes lead to postoperative anemia. Tranexam...Background: Total knee arthroplasty (TKA) is the most frequently performed procedure in treating advanced knee osteoarthritis. Excessive perioperative blood loss can sometimes lead to postoperative anemia. Tranexamic acid (TXA) is a potent fibrinolysis inhibitor which has been extensively used at the surgical incision and closure to lower overall blood loss in adult reconstruction surgery. Our previous study suggested that about two-thirds of the total blood loss (TBL) came from hidden blood loss (HBL) on postoperative days 1 and 2. The role of reducing HBL with TXA administration in postoperative TKA patients is unknown. The current study was designed to evaluate the efficiency and safety of supplemental intravenous (IV) TXA in further redticing HBL after primary TKA. Methods: A prospective pilot study was conducted at a single institution on 43 consecutive patients who underwent unilateral TKA from September 2014 to February 2015. All patients were given 1 g of IV TXA 10-15 rain before operation and another 1 g of IV TXA at the time of wound closure on the day of surgery. On postoperative days 1 and 2, the supplemental group (n = 21) was given additional 1 g of TXA intravenously twice a day, whereas the control group (n = 22) received an equal volume of saline. Drain output, hemoglobin (Hb), and hematocrit (HCT) were recorded preoperatively and 5 consecutive days postoperatively in both groups. HBL was calculated with the Gross formula. Pre- and post-operative lower extremity Doppler venous ultrasound was performed in all patients to detect deep vein thrombosis (DVT). The indexes were compared using the Mann-Whitney test, whereas the results of Hb and HCT were analyzed by repeated-measures analysis of variance. The difference was considered statistically significant ifP 〈 0.05. Results: The demographics and surgical characteristics of the two groups were comparable. Supplemental group had higher Hb level on postoperative days 1-5 compared to the control; however, the difference was not significant (F = 2.732, P = 0.106). The HCT of the supplemental group was significantly higher than that of the control group on postoperative day 5 (F= 5.254, P = 0.027). No significant difference was found in drainage volume and TBL, but the HBL was reduced in the supplemental group (supplemental 133.1 [71.8,287.3] ml and control 296.0 [ 185.3, 421.4] ml, Z = 2.478, P = 0.013. median [interquartile range]). There was one DVT in the control group and none in the supplemental group. All patients were tbllowed at 1 year after surgery, and no further complications were reported. Conclusion: Based on the current study, additional doses of IV TXA could potentially further reduce HBL alter primary TKA without increasing the risk of venous thromboembolism.展开更多
Owing to adjustable microstructure and stable physiochemical properties,carbon-based materials are regarded as promising materials as anodes for potassium-ion batteries(PlBs).Building amorphous structure and introduci...Owing to adjustable microstructure and stable physiochemical properties,carbon-based materials are regarded as promising materials as anodes for potassium-ion batteries(PlBs).Building amorphous structure and introducing defects are favorable methods to generate active sites and improve the electrochemical performances of carbon-based materials.In this work,we develop a facile carbonization method to prepare sulfur-doped amorphous carbon microspheres with hierarchical structure and modulated defects concentration(S-CM-700) for potassium storage.Benefiting from the special microstructure,S-CM-700 exhibits the optimal performance and obtains high reversible capacity of 199.6 mAh·g^(-1) at 100 mA·g^(-1),excellent rate property and prominent durability(0.0055%capacity decay per cycle during 1800 cycles).Kinetics analysis and electrochemical characterization are carried out to reveal that the potassium storage could be boosted by regulating the defect level,layer spacing and the content of sulfur-doping.The work provides a general synthesis approach to prepare sustainable carbon anodes for advanced PlBs.展开更多
基金financially supported by the National Natural Science Foundation of China (No. 52102201, No. 52102200)the Basic and Applied Basic Research Foundation of Guangdong Province (No. 2021B1515130002)。
基金All authors have no conflict of interest regarding this paper. This work was supported by Grant National Natural Science Foundation of China (81400262) & Backbone Fund of Peking University Third Hospital.
基金supported by the National Key R&D Program of China(Grant No.2017YFA0402704)the National Natural Science Foundation of China(Grant Nos.11803044 and 11933003)+2 种基金the China Manned Space Project with No.CMSCSST-2021-A05sponsored(in part)by the Chinese Academy of Sciences(CAS)through a grant to the CAS South America Center for Astronomy(CASSACA)。
文摘The Spitzer Extended Deep Survey(SEDS)as a deep and wide mid-infrared(MIR)survey project provides a sample of 500000+sources spreading 1.46 square degree and a depth of 26 AB mag(3σ).Combining with the previous available data,we build a PSF-matched multi-wavelength photometry catalog from u band to 8μm.We fit the SEDS galaxies spectral energy distributions by the local galaxy templates.The results show that the SEDS galaxy can be fitted well,indicating the high redshift galaxy(z~1)shares the same templates with the local galaxies.This study would facilitate the further study of the galaxy luminosity and high redshift mass function.
基金supported by the National Key R&D Program of China(Grant 2017YFA0402704)by the National Natural Science Foundation of China(NSFC,Nos.11803044,11933003,11673028)+3 种基金sponsored(in part)by the Chinese Academy of Sciences(CAS),through a grant to the CAS South America Center for Astronomy(CASSACA)supported by the NSFC(Nos.U1931109 and 11733006)the Young Researcher Grant funded by National Astronomical Observatories,Chinese Academy of Sciences(CAS)the Youth Innovation Promotion Association,CAS。
文摘How low surface brightness galaxies(LSBGs)form stars and assemble stellar mass is one of the most important questions related to understanding the LSBG population.We select a sample of 381 HI bright LSBGs with both far ultraviolet(FUV)and near infrared(NIR)observations to investigate the star formation rate(SFR)and stellar mass scales,and the growth mode.We measure the FUV and NIR radii of our sample,which represent the star-forming and stellar mass distribution scales respectively.We also compare the FUV and H band radius-stellar mass relation with archival data,to identify the SFR and stellar mass structure difference between the LSBG population and other galaxies.Since galaxy HI mass has a tight correlation with the HI radius,we can also compare the HI and FUV radii to understand the distribution of HI gas and star formation activities.Our results show that most of the HI selected LSBGs have extended star formation structure.The stellar mass distribution of LSBGs may have a similar structure to disk galaxies at the same stellar mass bins,but the star-forming activity of LSBGs happens at a larger radius than the high surface density galaxies,which may help to identify the LSBG sample from the wide-field deep u band image survey.The HI is also distributed at larger radii,implying a steeper(or not)Kennicutt-Schmidt relation for LSBGs.
基金supported by the National Natural Science Foundation of China(22076196,U22B20139,12175024,21906163,22276147,and 22076152).
文摘Exploring the physiochemical properties and expanding the applications of actinide-containing materials is paramount to address the escalating challenge of radioactive waste accumulation.However,unlocking the full potential of these materials is largely crippled by the radiotoxicity of the actinides.We report here two porous and luminescent thorium-based metal-organic frameworks(Th-BITD-1 and Th-BITD-2)that serve as a bifunctional platform for sequencing and sensing of radioiodine,a much more radioactive fission product discharged during the nuclear fuel reprocessing.In particular,Th-BITD-1 displays better iodine uptake performance than Th-BITD-2 via the solution-based process and vapor diffusion with the maximum adsorption capacities of 831 and 1099 mg/g,respectively.Fur thermore,Th-BITD-1 can function as a highly sensitive luminescence sensor for iodate with a quenching constant(Ksv)of 6.6(5)×10^(3) M^(-1)and a detection limit of 2.02μM,respectively,outperforming 2.96(6)×10^(3)M^(-1)and 10.5μM of Th-BITD-2.Moreover,a positive correlation between the sensing efficacy and the iodate adsorption capacity has been revealed.This work highlights the opportunity in designing novel actinide-based MOFs for their potential applications in radiological fields,e.g.,radionuclide separation and detection.
基金the Natural Science Foundation of Jiangxi Education Department(No.GJJ170680)the National Natural Science Foundation of China(Nos.51963010,21867011,and 51563011).
文摘Self-healing polymers based on dynamic crosslinkers have drawn rapidly increasing interest over the last decade.Here,a self-healable epoxy network with exchangeable disulfide bonds was synthesized by polymerizing two epoxies with an aromatic amine containing a disulfide bond.The bisphenol A diglycidyl ether(DGEBA)and poly(ethylene glycol)diglycidyl ether(DER736)were used as rigid and soft components,respectively.The crosslinking densities of studied polymers decreased with the increasing amount of DER736,resulting in the lower glassy temperature and weaker mechanical strength.The dynamic covalent network character of disulfide bond and its low active energy were also investigated through stress relaxation experiments at various temperatures.The self-healing performance of healable epoxy resins with varied flexibility was measured by tensile tests.The tensile strength of a full-cut sample was restored to 84%(13 MPa)of the initial values(16 MPa)at moderate temperature.Its healed fracture strain was up to 505%.Moreover,the effect of healing time and temperature on the self-healing properties was also studied.A model was proposed to investigate the self-repairing efficiency evolution with healing time,suggesting that hydrogen bonds mainly contributed to the initial sticking or interfacial adhesion while disulfide links and chain interdiffusion assisted time dependent reformation of networks to restore the original mechanical strength.
文摘Background: Currently, various calculation methods for evaluating blood-loss in patients with total knee arthroplasty (TKA) are applied in clinical practice. However, different methods may yield different results. The purpose of this study was to determine the most reliable method for calculating blood-loss after primary TKA. Methods: We compared blood-loss in 245 patients who underwent primary unilateral TKA from February 2010 to August 2011. We calculated blood-loss using four methods: Gross equation, hemoglobin (Hb) balance, the Orthopedic Surgery Transfusion Hemoglobin European Overview (OSTHEO) formula, and Hb-dilution. We determined Pearson's correlation coefficients for the four methods. Results: There were large differences in the calculated blood-loss obtained by the four methods. In descending order of combined correlation coefficient based on calculated blood-loss, the methods were Hb-balance, OSTHEO formula, Hb-dilution, and Gross equation. Conclusions: The Hb-balance method may be the most reliable method of estimating blood-loss after TKA.
文摘Background: Total knee arthroplasty (TKA) is the most frequently performed procedure in treating advanced knee osteoarthritis. Excessive perioperative blood loss can sometimes lead to postoperative anemia. Tranexamic acid (TXA) is a potent fibrinolysis inhibitor which has been extensively used at the surgical incision and closure to lower overall blood loss in adult reconstruction surgery. Our previous study suggested that about two-thirds of the total blood loss (TBL) came from hidden blood loss (HBL) on postoperative days 1 and 2. The role of reducing HBL with TXA administration in postoperative TKA patients is unknown. The current study was designed to evaluate the efficiency and safety of supplemental intravenous (IV) TXA in further redticing HBL after primary TKA. Methods: A prospective pilot study was conducted at a single institution on 43 consecutive patients who underwent unilateral TKA from September 2014 to February 2015. All patients were given 1 g of IV TXA 10-15 rain before operation and another 1 g of IV TXA at the time of wound closure on the day of surgery. On postoperative days 1 and 2, the supplemental group (n = 21) was given additional 1 g of TXA intravenously twice a day, whereas the control group (n = 22) received an equal volume of saline. Drain output, hemoglobin (Hb), and hematocrit (HCT) were recorded preoperatively and 5 consecutive days postoperatively in both groups. HBL was calculated with the Gross formula. Pre- and post-operative lower extremity Doppler venous ultrasound was performed in all patients to detect deep vein thrombosis (DVT). The indexes were compared using the Mann-Whitney test, whereas the results of Hb and HCT were analyzed by repeated-measures analysis of variance. The difference was considered statistically significant ifP 〈 0.05. Results: The demographics and surgical characteristics of the two groups were comparable. Supplemental group had higher Hb level on postoperative days 1-5 compared to the control; however, the difference was not significant (F = 2.732, P = 0.106). The HCT of the supplemental group was significantly higher than that of the control group on postoperative day 5 (F= 5.254, P = 0.027). No significant difference was found in drainage volume and TBL, but the HBL was reduced in the supplemental group (supplemental 133.1 [71.8,287.3] ml and control 296.0 [ 185.3, 421.4] ml, Z = 2.478, P = 0.013. median [interquartile range]). There was one DVT in the control group and none in the supplemental group. All patients were tbllowed at 1 year after surgery, and no further complications were reported. Conclusion: Based on the current study, additional doses of IV TXA could potentially further reduce HBL alter primary TKA without increasing the risk of venous thromboembolism.
基金financially supported by the National Natural Science Foundation of China (No.51904216)the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (No.WUT:2022-KF-4)the National Innovation Training Program for College Students (No. 312040000254)。
文摘Owing to adjustable microstructure and stable physiochemical properties,carbon-based materials are regarded as promising materials as anodes for potassium-ion batteries(PlBs).Building amorphous structure and introducing defects are favorable methods to generate active sites and improve the electrochemical performances of carbon-based materials.In this work,we develop a facile carbonization method to prepare sulfur-doped amorphous carbon microspheres with hierarchical structure and modulated defects concentration(S-CM-700) for potassium storage.Benefiting from the special microstructure,S-CM-700 exhibits the optimal performance and obtains high reversible capacity of 199.6 mAh·g^(-1) at 100 mA·g^(-1),excellent rate property and prominent durability(0.0055%capacity decay per cycle during 1800 cycles).Kinetics analysis and electrochemical characterization are carried out to reveal that the potassium storage could be boosted by regulating the defect level,layer spacing and the content of sulfur-doping.The work provides a general synthesis approach to prepare sustainable carbon anodes for advanced PlBs.