The design of anode materials with a high specific capacity,high cyclic stability,and superior rate performance is required for the practical applications of sodium-ion batteries(SIBs).In this regard,we introduce in t...The design of anode materials with a high specific capacity,high cyclic stability,and superior rate performance is required for the practical applications of sodium-ion batteries(SIBs).In this regard,we introduce in this work a facile,low-cost and scalable method for the synthesis of nanocomposites of amorphous molybdenum sulfide(a-MoS_(x))and hierarchical porous carbon and have systematically investigated their performance for sodium ion storage.In the synthesis,ammonium molybdate tetrahydrate and thioacetamide are used as molybdenum and sulfur sources,respectively,with abundant corn starch as the carbon source and KOH as an activation agent.A simple pyrolysis of their mixtures leads to the formation of nanocomposites with a-MoS_(x)embedded within a hierarchical porous carbon(MoS_(x)@HPC),which are featured with a high surface area of up to 518.4 m^(2) g^(-1)and hierarchical pores ranging from micropores to macropores.It has also been shown that the annealing of MoS_(x)@HPC results in the formation of crystalline MoS_(2)nanosheets anchored in the hierarchical porous carbon matrix(MoS_(2)@HPC).The as-prepared nanocomposite MoS_(x)@HPC1 at an optimum carbon content of 32 wt%delivers a high specific sodium storage capacity of 599 mAh g^(-1)at 0.2 A g^(-1)and a high-rate performa nce with a retained capacity of 289 mAh g^(-1)at 5 A g^(-1).A comparison of the electrochemical performances of MoS_(x)@HPC and MoS_(2)@HPC demonstrates the superior specific capacity,rate performance,and charge transfer kinetics of the former,highlighting the unique advantageous role of amorphous MoS_(x)relative to crystalline MoS_(2).展开更多
An immersed liquid cooling slab laser is demonstrated with deionized water as the coolant and a Nd:YAG slab as the gain medium.Using waveguides,a highly uniform pump beam distribution is achieved,and the flow velocity...An immersed liquid cooling slab laser is demonstrated with deionized water as the coolant and a Nd:YAG slab as the gain medium.Using waveguides,a highly uniform pump beam distribution is achieved,and the flow velocity distribution is also optimized in the channels of the gain module(GM).At various flow velocities,the convective heat transfer coefficient(CHTC)is obtained.Experimentally,a maximum output power of 434 W is obtained with an optical–optical efficiency of 27.1%and a slope efficiency of 36.6%.To the best of our knowledge,it is the highest output power of an immersed liquid cooling laser oscillator with a single Nd:YAG slab.展开更多
In this article,there were two annotation mistakes about the precise deletion position in COL4A3 and COL4A4 mutations in ARAS patients(summarized in Figure 2E).This was caused by a bug in the old version(v3.4)of Varia...In this article,there were two annotation mistakes about the precise deletion position in COL4A3 and COL4A4 mutations in ARAS patients(summarized in Figure 2E).This was caused by a bug in the old version(v3.4)of Variant Caller for Ion Torrent.The variant in family AP5 should be described as‘chr2:227942771delG’,instead of‘chr:227942770delG’,in the COL4A4 gene.The variant identified in family AP1 should be described as‘chr2:228172490delA’,instead of‘chr:228172489delA’,in the COL4A3 gene.The corrected Figure 2E is shown as below.The results and conclusions of the article are not affected,and the authors apologize for these errors.展开更多
基金financially supported by grants from the Natural Science and Engineering Research Council of Canada(Grant#RGPIN-2020-05546)。
文摘The design of anode materials with a high specific capacity,high cyclic stability,and superior rate performance is required for the practical applications of sodium-ion batteries(SIBs).In this regard,we introduce in this work a facile,low-cost and scalable method for the synthesis of nanocomposites of amorphous molybdenum sulfide(a-MoS_(x))and hierarchical porous carbon and have systematically investigated their performance for sodium ion storage.In the synthesis,ammonium molybdate tetrahydrate and thioacetamide are used as molybdenum and sulfur sources,respectively,with abundant corn starch as the carbon source and KOH as an activation agent.A simple pyrolysis of their mixtures leads to the formation of nanocomposites with a-MoS_(x)embedded within a hierarchical porous carbon(MoS_(x)@HPC),which are featured with a high surface area of up to 518.4 m^(2) g^(-1)and hierarchical pores ranging from micropores to macropores.It has also been shown that the annealing of MoS_(x)@HPC results in the formation of crystalline MoS_(2)nanosheets anchored in the hierarchical porous carbon matrix(MoS_(2)@HPC).The as-prepared nanocomposite MoS_(x)@HPC1 at an optimum carbon content of 32 wt%delivers a high specific sodium storage capacity of 599 mAh g^(-1)at 0.2 A g^(-1)and a high-rate performa nce with a retained capacity of 289 mAh g^(-1)at 5 A g^(-1).A comparison of the electrochemical performances of MoS_(x)@HPC and MoS_(2)@HPC demonstrates the superior specific capacity,rate performance,and charge transfer kinetics of the former,highlighting the unique advantageous role of amorphous MoS_(x)relative to crystalline MoS_(2).
基金supported by the National Natural Science Foundation of China(No.62105179)the Joint Funds of the Zhejiang Provincial Natural Science Foundation(No.LZY21F050001)the Quzhou Science and Technology Plan Project(Nos.2022K87 and 2021K40).
文摘An immersed liquid cooling slab laser is demonstrated with deionized water as the coolant and a Nd:YAG slab as the gain medium.Using waveguides,a highly uniform pump beam distribution is achieved,and the flow velocity distribution is also optimized in the channels of the gain module(GM).At various flow velocities,the convective heat transfer coefficient(CHTC)is obtained.Experimentally,a maximum output power of 434 W is obtained with an optical–optical efficiency of 27.1%and a slope efficiency of 36.6%.To the best of our knowledge,it is the highest output power of an immersed liquid cooling laser oscillator with a single Nd:YAG slab.
基金This workwas supported by grants from the National Basic Research Program of China 973, grant no. 2012CB517600 （no. 2012CB517604）, the National Natural Science Foundation of China （no. 81030015, 81070568, 81370015, and 81000295）, the International Cooperation and Exchange Projects of Shanghai Science and Technology Committee （no. 14430721000）, and the Chinese Medical Association Clinical Research Special Fund （no. 13030280413）.
文摘In this article,there were two annotation mistakes about the precise deletion position in COL4A3 and COL4A4 mutations in ARAS patients(summarized in Figure 2E).This was caused by a bug in the old version(v3.4)of Variant Caller for Ion Torrent.The variant in family AP5 should be described as‘chr2:227942771delG’,instead of‘chr:227942770delG’,in the COL4A4 gene.The variant identified in family AP1 should be described as‘chr2:228172490delA’,instead of‘chr:228172489delA’,in the COL4A3 gene.The corrected Figure 2E is shown as below.The results and conclusions of the article are not affected,and the authors apologize for these errors.
