W0.42Fe0.58 alloy, instead of pure W and Fe, was used to substitute Co in LaNi3.70Co0.2Mno.3om10.15Cuo.65 alloy to improve the overall electrochemical properties with the decrement of the cost. Microstructures and ele...W0.42Fe0.58 alloy, instead of pure W and Fe, was used to substitute Co in LaNi3.70Co0.2Mno.3om10.15Cuo.65 alloy to improve the overall electrochemical properties with the decrement of the cost. Microstructures and electrochemical characteristics of LaNi3.70Co0.2-xMno.3oA10.15Cuo.65（W0.42Fe0.58）x （x=0.20） hydrogen storage alloys were characterized. X-ray diffraction patterns and backscattered electron images indicated that the pristine alloy was LaNi5 phase, while the alloys containing W0.a2Fe0.58 were made of LaNi5 matrix phase and W phase. The relatived abundance of W phase increased with the increase in x value. Lattice parameters a, c, c/a and cell volume V of LaNi5 phase increased with increasing x value. Activation property of the alloy electrodes was improved by substituting Co by Wo.42Fe0.58. As x increased from 0 to 0.20, maximum discharge capacity of alloy electrodes decreased from 335.4 （x=0） to 320.7 mAh/g （x=0.20）. The high-rate dischargeability at the discharge current density of 1200 mA increased from 59.8% （x=0） to 76.8% （x=0.10）, and then decreased to 64.7% （x=0.20）. The cycling capacity retention rate at the 100th cycle decreased from 80.4% （x=0） to 55.8% （x=0.20）, which should be ascribed to the degradation of the corrosion resistance and electrochemical kinetics of alloy electrodes.展开更多
Background： This meta-analysis was to determine the association of the cumulative dose of 130/0.4 or 0.42 （hydroxyethyl starch [HES] 130/0.4＊） or delta daily fluid balance （i.e., daily fluid balance in HES group ...Background： This meta-analysis was to determine the association of the cumulative dose of 130/0.4 or 0.42 （hydroxyethyl starch [HES] 130/0.4＊） or delta daily fluid balance （i.e., daily fluid balance in HES group over or below control group） with the heterogeneity of risk ratio （RR） for mortality in randomized control trials （RCTs）. Methods： Three databases （PubMed, EMBASE, Cochrane） were searched to identify prospective RCTs reporting mortality in adult patients with sepsis to compare HES 130/0.4＊ with crystalloids or albumin. Meta-analysis was performed using random effects. Sensitivity and meta-regression analyses were used to examine the heterogeneity sources of RR for mortality, Results： A total number of 4408 patients from 11 RCTs were included. The pooled RR showed no significant difference for overall mortality in patients with administration of liES130/0.4＂ compared with treatment of control fluids （RR： 1.02, 95% confidence interval： 0.9-1.17; P = 0.73）. Heterogeneity was moderate across recruited trials （l^2 = 34%, P = 0.13）. But, a significant variation was demonstrated in subgroup with crystalloids as control fluids （l^2 = 42%, P 〈 0.1）. Sensitivity analysis revealed that trials with high risk of bias did not significantly impact the pooled estimates for mortality. Meta-regression analysis also did not determine a dose-effect relationship of HES 130/0.4＊ with mortality （P - 0.298）, but suggested daily delta fluid balance being likely associated with mortality in septic patients receiving HES130/130/0.4＊ （P = 0.079）.Conclusions： Inappropriate daily positive fluid balance was likely an important source of heterogeneity in these trials reporting HES 130/0.4＊ associated with excess mortality in septic patients.展开更多
Monolayer molybdenum disulfide(MoS_(2))has weak light absorption due to its atomically-thin thickness,thus hindering the development of MoS_(2)-based optoelectronic devices.CdS_(x)Se_(1-x)has excellent photoelectric p...Monolayer molybdenum disulfide(MoS_(2))has weak light absorption due to its atomically-thin thickness,thus hindering the development of MoS_(2)-based optoelectronic devices.CdS_(x)Se_(1-x)has excellent photoelectric performance in the visible light range,and its nanostructure shows great potential in new nanoscale electronic and optoelectronic devices.In this work,a composite photodetector device with the combination of monolayer MoS_(2)nanosheets and CdS_(0.42)Se_(0.58)nanobelts has been successfully prepared,which can not only maintain the inherent excellent properties of the two blocks,but also play a synergistic role between them,thus improving the photoelectric performance of the device.The monolayer MoS_(2)nanosheet/CdS_(0.42)Se_(0.58)nanobelt photodetector has a wide spectral response range(400–800 nm),high responsivity(527.22 A/W)and large external quantum efficiency(EQE)(1.06×10^(5)%).Compared with the isolated monolayer MoS_(2)nanosheet,both the responsivity and EQE of the hybrid photodetector are increased by 117.4 times under 620 nm illumination.This study provides a way to prepare hybrid photodetectors with wide spectral response and high responsivity.展开更多
基金supported by the National Natural Science Foundation of China(51471065,U1304522)Program for New Century Excellent Talents in University(NCET-11-0943)+2 种基金Plan for Scientific Innovation Talent of Henan Province(144100510009)Fundamental Research Funds for the Universities of Henan Province(NSFRF140601)Foundation for University Key Teacher in the University of Henan Province(2011GGJS-052)
文摘W0.42Fe0.58 alloy, instead of pure W and Fe, was used to substitute Co in LaNi3.70Co0.2Mno.3om10.15Cuo.65 alloy to improve the overall electrochemical properties with the decrement of the cost. Microstructures and electrochemical characteristics of LaNi3.70Co0.2-xMno.3oA10.15Cuo.65（W0.42Fe0.58）x （x=0.20） hydrogen storage alloys were characterized. X-ray diffraction patterns and backscattered electron images indicated that the pristine alloy was LaNi5 phase, while the alloys containing W0.a2Fe0.58 were made of LaNi5 matrix phase and W phase. The relatived abundance of W phase increased with the increase in x value. Lattice parameters a, c, c/a and cell volume V of LaNi5 phase increased with increasing x value. Activation property of the alloy electrodes was improved by substituting Co by Wo.42Fe0.58. As x increased from 0 to 0.20, maximum discharge capacity of alloy electrodes decreased from 335.4 （x=0） to 320.7 mAh/g （x=0.20）. The high-rate dischargeability at the discharge current density of 1200 mA increased from 59.8% （x=0） to 76.8% （x=0.10）, and then decreased to 64.7% （x=0.20）. The cycling capacity retention rate at the 100th cycle decreased from 80.4% （x=0） to 55.8% （x=0.20）, which should be ascribed to the degradation of the corrosion resistance and electrochemical kinetics of alloy electrodes.
文摘Background： This meta-analysis was to determine the association of the cumulative dose of 130/0.4 or 0.42 （hydroxyethyl starch [HES] 130/0.4＊） or delta daily fluid balance （i.e., daily fluid balance in HES group over or below control group） with the heterogeneity of risk ratio （RR） for mortality in randomized control trials （RCTs）. Methods： Three databases （PubMed, EMBASE, Cochrane） were searched to identify prospective RCTs reporting mortality in adult patients with sepsis to compare HES 130/0.4＊ with crystalloids or albumin. Meta-analysis was performed using random effects. Sensitivity and meta-regression analyses were used to examine the heterogeneity sources of RR for mortality, Results： A total number of 4408 patients from 11 RCTs were included. The pooled RR showed no significant difference for overall mortality in patients with administration of liES130/0.4＂ compared with treatment of control fluids （RR： 1.02, 95% confidence interval： 0.9-1.17; P = 0.73）. Heterogeneity was moderate across recruited trials （l^2 = 34%, P = 0.13）. But, a significant variation was demonstrated in subgroup with crystalloids as control fluids （l^2 = 42%, P 〈 0.1）. Sensitivity analysis revealed that trials with high risk of bias did not significantly impact the pooled estimates for mortality. Meta-regression analysis also did not determine a dose-effect relationship of HES 130/0.4＊ with mortality （P - 0.298）, but suggested daily delta fluid balance being likely associated with mortality in septic patients receiving HES130/130/0.4＊ （P = 0.079）.Conclusions： Inappropriate daily positive fluid balance was likely an important source of heterogeneity in these trials reporting HES 130/0.4＊ associated with excess mortality in septic patients.
基金supported by the National Natural Science Foundation of China(Nos.11864046 and 11764046)the Basic Research Program of Yunnan Province(Nos.202001AT070064 and 202101AT070124)Spring City Plan:the High-level Talent Promotion and Training Project of Kunming(2022SCP005).
文摘Monolayer molybdenum disulfide(MoS_(2))has weak light absorption due to its atomically-thin thickness,thus hindering the development of MoS_(2)-based optoelectronic devices.CdS_(x)Se_(1-x)has excellent photoelectric performance in the visible light range,and its nanostructure shows great potential in new nanoscale electronic and optoelectronic devices.In this work,a composite photodetector device with the combination of monolayer MoS_(2)nanosheets and CdS_(0.42)Se_(0.58)nanobelts has been successfully prepared,which can not only maintain the inherent excellent properties of the two blocks,but also play a synergistic role between them,thus improving the photoelectric performance of the device.The monolayer MoS_(2)nanosheet/CdS_(0.42)Se_(0.58)nanobelt photodetector has a wide spectral response range(400–800 nm),high responsivity(527.22 A/W)and large external quantum efficiency(EQE)(1.06×10^(5)%).Compared with the isolated monolayer MoS_(2)nanosheet,both the responsivity and EQE of the hybrid photodetector are increased by 117.4 times under 620 nm illumination.This study provides a way to prepare hybrid photodetectors with wide spectral response and high responsivity.
