The global trade governance system is the institutional safeguard for maintaining the operation of world trade. It consists of governance entities, platforms and rules. Since the end of World War Ⅱ, the global trade ...The global trade governance system is the institutional safeguard for maintaining the operation of world trade. It consists of governance entities, platforms and rules. Since the end of World War Ⅱ, the global trade governance system has mainly referred to the multilateral trading system, with the General Agreement on Tariffs and Trade(GATT) and the World Trade Organization(WTO) serving as governance platforms.展开更多
A new sodium borate-formate,Na_(3)B_(6)O_(10)(HCOO)(1),has been successfully synthesized in a surfactantthermal system.Compound 1 crystallizes in the orthorhombic system,with the polar P2_(1)2_(1)2_(1) space group and...A new sodium borate-formate,Na_(3)B_(6)O_(10)(HCOO)(1),has been successfully synthesized in a surfactantthermal system.Compound 1 crystallizes in the orthorhombic system,with the polar P2_(1)2_(1)2_(1) space group and the parameters a=7.6375(8)Å,b=9.9345(9)Å,c=12.7231(13)Å,V=965.36(17)Å^(3),and Z=4.Compound 1 contains basic building units of(B_(6)O_(13))^(8-),and each(B_(6)O_(13))^(8-)unit connects with six other neighboring units and forms a novel 3D open-framework with 9R channels.展开更多
The assembly of molecules simultaneously exhibiting slow magnetic relaxation and spin crossover(SCO)behaviors at the molecular level is a fascinating challenge for chemists.The synthesis strategy of combining 3d and 4...The assembly of molecules simultaneously exhibiting slow magnetic relaxation and spin crossover(SCO)behaviors at the molecular level is a fascinating challenge for chemists.The synthesis strategy of combining 3d and 4f ions in a molecule is a very promising route to a dual magnetic system.With this goal in mind,a series of mixed-metal structures,namely[Dy_(2)Fe_(2)(H_(2)L)_(4)(OH)_(6)](NO_(3))_(4)·12CH_(3)OH·6H_(2)O(1),[Dy_(2)Fe_(2)(H_(2)L)_(4)(OH)_(6)]Cl_(4)·2CH_(3)OH·20H_(2)O(2),[Dy_(2)Fe_(2)(H_(2)L)_(4)(OH)_(6)]Cl_(4)·4CH_(3)OH·20H_(2)O(3)and[Dy_(2)Fe_(2)(H_(2)L)_(4)(NO_(3))_(3)CH_(3)O](NO_(3))_(5)(CF_(3)SO_(3))·6CH_(3)OH·H_(2)O(4)containing a versatile Schiff-base ligand N’-((E)-pyridin-2-ylmethylene)-6-(2-((E)-pyridin-2-ylmethylene)hydrazinyl)nicotinohydrazide(H_(2)L),have been synthesized and characterized.Alternating current(ac)susceptibility measurements reveal that complexes 1-4 exhibit a slow magnetic relaxation behavior.More importantly,complexes 2 and 3 exhibit one-and two-step SCO behaviors,respectively.To our knowledge,this is the first report on 3d-4f structures that exhibit the dual function of slow magnetic relaxation and SCO behaviors to date.展开更多
A new alkaline-earth and rare-earth borate fluoride,Ba_(10)LuB_(18)O_(32)F_(13),the first example of borate in the Lu–B–O–F system,has been successfully synthesized in a high-temperature vacuum system.It crystalliz...A new alkaline-earth and rare-earth borate fluoride,Ba_(10)LuB_(18)O_(32)F_(13),the first example of borate in the Lu–B–O–F system,has been successfully synthesized in a high-temperature vacuum system.It crystallizes in the orthorhombic system,with the Fmm2 space group and the parameters a=16.5749(6)Å,b=16.7644(9)Å,c=13.6222(6)Å,and Z=4.It represents a new fundamental building block(FBB).展开更多
In a recent study published in Nature Medicine by Dr.Link,two weeks of dietary intervention affected host immune system significantly.1 The major finding was that ketogenic diet significantly promoted pathways and cel...In a recent study published in Nature Medicine by Dr.Link,two weeks of dietary intervention affected host immune system significantly.1 The major finding was that ketogenic diet significantly promoted pathways and cell enrichment related to the adaptive immune system,with changes in Actinobacteria,Bacteroidetes,Firmicutes,and Proteobacteria,where Firmicutes being the most affected phylum.展开更多
We demonstrate the spectroscopy of incoherent light with subdiffraction resolution.In a proof-of-principle experiment,we analyze the spectrum of a pair of incoherent pointlike sources whose separation is below the dif...We demonstrate the spectroscopy of incoherent light with subdiffraction resolution.In a proof-of-principle experiment,we analyze the spectrum of a pair of incoherent pointlike sources whose separation is below the diffraction limit.The two sources mimic a planetary system,with a brighter source for the star and a dimmer one for the planet.Acquiring spectral information about the secondary source is difficult because the two images have a substantial overlap.This limitation is solved by leveraging a structured measurement based on spatial-mode demultiplexing,where light is first sorted in its Hermite–Gaussian components in the transverse field then measured by photon detection.This allows us to effectively decouple the photons coming from the two sources.An application is suggested to enhance the exoplanets’atmosphere spectroscopy.A number of experiments of super-resolution imaging based on spatial demultiplexing have been conducted in the past few years,with promising results.Here,for the first time to the best of our knowledge,we extend this concept to the domain of spectroscopy.展开更多
This paper deals with the stabilization of the nonholonomic systems with strongly nonlinear uncertainties. The objective is to design an output feedback law such that the closed-loop system is globally asymptotically ...This paper deals with the stabilization of the nonholonomic systems with strongly nonlinear uncertainties. The objective is to design an output feedback law such that the closed-loop system is globally asymptotically regulated at the origin. The systematic strategy combines the input-state scaling technique with the backstepping technique. A novel switching control strategy based on the output measurement of the first subsystem is employed to make the subsystem far away from the origin. The simulation demonstrates the effectiveness of the proposed controller.展开更多
文摘The global trade governance system is the institutional safeguard for maintaining the operation of world trade. It consists of governance entities, platforms and rules. Since the end of World War Ⅱ, the global trade governance system has mainly referred to the multilateral trading system, with the General Agreement on Tariffs and Trade(GATT) and the World Trade Organization(WTO) serving as governance platforms.
基金supported by the National Natural Science Foundation of China(Grant 21975224).
文摘A new sodium borate-formate,Na_(3)B_(6)O_(10)(HCOO)(1),has been successfully synthesized in a surfactantthermal system.Compound 1 crystallizes in the orthorhombic system,with the polar P2_(1)2_(1)2_(1) space group and the parameters a=7.6375(8)Å,b=9.9345(9)Å,c=12.7231(13)Å,V=965.36(17)Å^(3),and Z=4.Compound 1 contains basic building units of(B_(6)O_(13))^(8-),and each(B_(6)O_(13))^(8-)unit connects with six other neighboring units and forms a novel 3D open-framework with 9R channels.
基金National Natural Science Foundation of China(Grants 21525103,21871247 and 21801237)the Key Research Program of Frontier Sciences,CAS(Grant ZDBS-LY-SLH023),for financial supportthe support from the Royal Society-Newton Advanced Fellowship(NA160075).
文摘The assembly of molecules simultaneously exhibiting slow magnetic relaxation and spin crossover(SCO)behaviors at the molecular level is a fascinating challenge for chemists.The synthesis strategy of combining 3d and 4f ions in a molecule is a very promising route to a dual magnetic system.With this goal in mind,a series of mixed-metal structures,namely[Dy_(2)Fe_(2)(H_(2)L)_(4)(OH)_(6)](NO_(3))_(4)·12CH_(3)OH·6H_(2)O(1),[Dy_(2)Fe_(2)(H_(2)L)_(4)(OH)_(6)]Cl_(4)·2CH_(3)OH·20H_(2)O(2),[Dy_(2)Fe_(2)(H_(2)L)_(4)(OH)_(6)]Cl_(4)·4CH_(3)OH·20H_(2)O(3)and[Dy_(2)Fe_(2)(H_(2)L)_(4)(NO_(3))_(3)CH_(3)O](NO_(3))_(5)(CF_(3)SO_(3))·6CH_(3)OH·H_(2)O(4)containing a versatile Schiff-base ligand N’-((E)-pyridin-2-ylmethylene)-6-(2-((E)-pyridin-2-ylmethylene)hydrazinyl)nicotinohydrazide(H_(2)L),have been synthesized and characterized.Alternating current(ac)susceptibility measurements reveal that complexes 1-4 exhibit a slow magnetic relaxation behavior.More importantly,complexes 2 and 3 exhibit one-and two-step SCO behaviors,respectively.To our knowledge,this is the first report on 3d-4f structures that exhibit the dual function of slow magnetic relaxation and SCO behaviors to date.
基金supported by the National Natural Science Foundation of China(51872325,61835014,51972336)the Shanghai Cooperation Organization Science and Technology Partnership Program(2020E01039)+5 种基金Xinjiang Tianshan Youth Program-Outstanding Young Science and Technology Talents(2020Q004)CAS Youth Interdisciplinary Team(JCTD-2021-18)the West Light Foundation of CAS(2021-XBQNXZ-004)the Scientific Instrument Developing Project,CAS(YJKYYQ20210033)Key Research Program of Frontier Sciences,CAS(ZDBS-LY-SLH035)the International Partnership Program of CAS(1A1365kysb20200008).
文摘A new alkaline-earth and rare-earth borate fluoride,Ba_(10)LuB_(18)O_(32)F_(13),the first example of borate in the Lu–B–O–F system,has been successfully synthesized in a high-temperature vacuum system.It crystallizes in the orthorhombic system,with the Fmm2 space group and the parameters a=16.5749(6)Å,b=16.7644(9)Å,c=13.6222(6)Å,and Z=4.It represents a new fundamental building block(FBB).
基金supported by the National Natural Science Foundation of China(82371852).
文摘In a recent study published in Nature Medicine by Dr.Link,two weeks of dietary intervention affected host immune system significantly.1 The major finding was that ketogenic diet significantly promoted pathways and cell enrichment related to the adaptive immune system,with changes in Actinobacteria,Bacteroidetes,Firmicutes,and Proteobacteria,where Firmicutes being the most affected phylum.
基金European Commission (PE0000023-NQSTI)Ministero dell'Universitàe della Ricerca (QUEXO2022NZP4T3)Italian Space Agency (Subdiffraction Quantum Imaging SQI 2023-13-HH.0)。
文摘We demonstrate the spectroscopy of incoherent light with subdiffraction resolution.In a proof-of-principle experiment,we analyze the spectrum of a pair of incoherent pointlike sources whose separation is below the diffraction limit.The two sources mimic a planetary system,with a brighter source for the star and a dimmer one for the planet.Acquiring spectral information about the secondary source is difficult because the two images have a substantial overlap.This limitation is solved by leveraging a structured measurement based on spatial-mode demultiplexing,where light is first sorted in its Hermite–Gaussian components in the transverse field then measured by photon detection.This allows us to effectively decouple the photons coming from the two sources.An application is suggested to enhance the exoplanets’atmosphere spectroscopy.A number of experiments of super-resolution imaging based on spatial demultiplexing have been conducted in the past few years,with promising results.Here,for the first time to the best of our knowledge,we extend this concept to the domain of spectroscopy.
基金This research is supported by the National Natural Science Foundation of China under Grant No. 60974127.
文摘This paper deals with the stabilization of the nonholonomic systems with strongly nonlinear uncertainties. The objective is to design an output feedback law such that the closed-loop system is globally asymptotically regulated at the origin. The systematic strategy combines the input-state scaling technique with the backstepping technique. A novel switching control strategy based on the output measurement of the first subsystem is employed to make the subsystem far away from the origin. The simulation demonstrates the effectiveness of the proposed controller.
