Exploring zinc-free anode materials is one of the effective strategies to get the zinc dendrites problem of flexible zinc ion battery(ZIB)solved.In this work,an analogous heterostructure(AHS)is constructed from the ex...Exploring zinc-free anode materials is one of the effective strategies to get the zinc dendrites problem of flexible zinc ion battery(ZIB)solved.In this work,an analogous heterostructure(AHS)is constructed from the excellent MXene(Ti_(3)C_(2)T_(x))and TiSe_(2) nanosheets.The AHS not only possesses numerous diffu-sion paths and Zn^(2+)storage sites but also possesses a stable conductive network to accelerate charge transfer in the electrode.As a collaborative advantage,electrochemical measurement results show that MXene/TiSe_(2) electrodes display an excellent specific capacity of 177.9 mAh g^(-1) at 0.10 A g^(-1) and a long-term cycling stability of 77.4%capacity retention after 400 cycles.DFT computations further demon-strate the excellent performance of MXene/TiSe_(2) electrodes including desirable electronic conductivity and low Zn^(2+)migration barriers.The assembled flexible ZIB not only delivers a good specific capacity of 42.2μAh cm^(-2) at 0.20 mA cm^(-2) and a competitive energy density of 37.4μWh cm^(-2) but also exhibits excellent flexibility and thermostability.Furthermore,after 400 cycles at 0.60 A g^(-1),flexible ZIB shows a capacity retention of 73.8%.This work gives a successful attempt to design 2D layered materials as Zn metal-free anode for flexible ZIB.展开更多
Objective:Used extensively to treat cardiovascular disease,Danqi analogous formulas(DQAF)include prescriptions for Danqi(DQ),Fufang Danshen(FFDS)and Qishen Yiqi(QSYQ).Differences in prescription compatibility result i...Objective:Used extensively to treat cardiovascular disease,Danqi analogous formulas(DQAF)include prescriptions for Danqi(DQ),Fufang Danshen(FFDS)and Qishen Yiqi(QSYQ).Differences in prescription compatibility result in varying emphases of DQAF in clinical application.Methods and results:Based on network analysis in this study,common and distinct mechanisms of DQAF actions on cardiovascular disease were analyzed at a systemic level.Components etargetsepathways models were developed by Cytoscape(http://www.cytoscape.org/);whereby,target information for active compounds was obtained based on the PharmMapper database(http://59.78.96.61/pharmmapper/),which was further used to search pathways using the Kyoto Encyclopedia of Genes and Genomes database(http://www.genome.jp/kegg/).Based on target and network analyses,we discovered RBP4 is a potential common target of DQAF,while mitogen-activated protein kinase 1(MAPK1)and glutathione S-transferase P were potential targets of FFDS and QSYQ,respectively.Furthermore,the potential of DQAF to treat cardiovascular disease occurs through effects on the endocrine,immune,and digestive systems,in addition to lipid,sugar and amino acid metabolic pathways.Whereas FFDS exhibits effects on Toll-like receptor,transforming growth factor beta and MAPK signaling pathways;QSYQ exerts effects on cyclic adenosine monophosphate signaling,as well as metabolism of glutathione and arachidonic acid.展开更多
Transmitting quantum states by channels of analogous Bell states is studied in this paper. We analyze the transmitting process. constructed the probabilitic unitary operator, and gain the largest successful transfer q...Transmitting quantum states by channels of analogous Bell states is studied in this paper. We analyze the transmitting process. constructed the probabilitic unitary operator, and gain the largest successful transfer quantum state probability.展开更多
The main purpose of this paper is using the properties of the classical Gauss sum and the analytic methods to study the computational problem of one kind of hybrid power mean involving the character sum of polynomials...The main purpose of this paper is using the properties of the classical Gauss sum and the analytic methods to study the computational problem of one kind of hybrid power mean involving the character sum of polynomials and a sum analogous to Kloosterman sum mod p,an odd prime,and give two sharp asymptotic formulae for them.展开更多
In the DC microgrid,the lack of inertia and damping in power electronic converters results in poor stability of DC bus voltage and low inertia of the DC microgrid during fluctuations in load and photovoltaic power.To ...In the DC microgrid,the lack of inertia and damping in power electronic converters results in poor stability of DC bus voltage and low inertia of the DC microgrid during fluctuations in load and photovoltaic power.To address this issue,the application of a virtual synchronous generator(VSG)in grid-connected inverters control is referenced and proposes a control strategy called the analogous virtual synchronous generator(AVSG)control strategy for the interface DC/DC converter of the battery in the microgrid.Besides,a flexible parameter adaptive control method is introduced to further enhance the inertial behavior of the AVSG control.Firstly,a theoretical analysis is conducted on the various components of the DC microgrid,the structure of analogous virtual synchronous generator,and the control structure’s main parameters related to the DC microgrid’s inertial behavior.Secondly,the voltage change rate tracking coefficient is introduced to adjust the change of the virtual capacitance and damping coefficient flexibility,which further strengthens the inertia trend of the DC microgrid.Additionally,a small-signal modeling approach is used to analyze the approximate range of the AVSG’s main parameters ensuring system stability.Finally,conduct a simulation analysis by building the model of the DC microgrid system with photovoltaic(PV)and battery energy storage(BES)in MATLAB/Simulink.Simulation results from different scenarios have verified that the AVSG control introduces fixed inertia and damping into the droop control of the battery,resulting in a certain level of inertia enhancement.Furthermore,the additional adaptive control strategy built upon the AVSG control provides better and flexible inertial support for the DC microgrid,further enhances the stability of the DC bus voltage,and has a more positive impact on the battery performance.展开更多
Root Analogous Municipal Solid Waste System “RA-MSW” is a novel management system that manages waste, biogas, and leachate in bioreactor landfill. Different than conventional disposal at landfills, waste is penetrat...Root Analogous Municipal Solid Waste System “RA-MSW” is a novel management system that manages waste, biogas, and leachate in bioreactor landfill. Different than conventional disposal at landfills, waste is penetrated by synthetic roots that serve dual mission for biogas collection and leachate recirculation. RA-MSW roots are permeable hydropho- bic polymer material that are formed on-place or prefabricated at factory from recyclable material available on the dumping area. Since the material is hydrophobic, it does not contain water in the voids providing more space for gas transport and collection. The roots are also interchangeably used for leachate recirculation where the parameters of wa- ter content, nutrients, pH, and temperature are optimized to enhance biogas production simultaneously with leachate treatment. RA-MSW provides new approach of waste management and control;it has new virtues of landfill operation;new material medium for biogas collection;new biocell design configuration;new manipulation for leachate and biogas. The approach adds new merits for solid waste management, bio-energy utilization, and the concept of 5 R’s cycle for MSW management.展开更多
In the 21^(st)century,at a global level,energy and environment are the most important issues.The green approach to solve these issues is photocatalysis.In this regard,perovskite-based materials owing to their inexpens...In the 21^(st)century,at a global level,energy and environment are the most important issues.The green approach to solve these issues is photocatalysis.In this regard,perovskite-based materials owing to their inexpensiveness and non-toxicity have attracted significant interest.The photocatalytic activity of perovskite and layered perovskite needs some modification to provide better activity than that of the neat one.The modification can be done by replacing cations,formation of heterojunctions or formation of composites.This critical review presents and discusses the current development of perovskite,layered perovskite,and their composites especially withπ-conjugated carbon materials towards photocatalytic applications.After introduction of the synthesis methods of perovskite and layered perovskite as well as their properties,we focus on the description of various methods to synthesize their composites,mainly those with graphene,carbon nano-tubes and carbon nitrides.Particular importance is placed on strategies for the optimization of composite properties.Lastly,the advantages of perovskite and layered perovskite based composites in applications such as photocatalytic H2 production and pollutant degradation are described in detail.展开更多
In this paper, the dynamical forming mechanism of analogous rhythm phenomenon is studied by using a coupled ocean-atmosphere model in form of analogous discrepance. The results show that the analogous rhythm is non-un...In this paper, the dynamical forming mechanism of analogous rhythm phenomenon is studied by using a coupled ocean-atmosphere model in form of analogous discrepance. The results show that the analogous rhythm is non-uniform oscillation of analogous discrepance disturbance which is caused by the nonlinear coupled interaction of ocean-air system and the seasonal variation of monthly mean circulation. Then, the numerical simulations and sensitivity studies are conducted by using a global coupled ocean-atmosphere dynamical-statistical seasonal long-range numerical prediction model, the results not only prove the result of theoretical analysis, but also provide the basis of making seasonal long-range numerical prediction by using this model.展开更多
In 1867, Crambrown supposed that correlation existed between the bioactivity of drugs and features of their chemical structures. Later, in 1900, overton found that the bioactivities of anaesthetic of different chemica...In 1867, Crambrown supposed that correlation existed between the bioactivity of drugs and features of their chemical structures. Later, in 1900, overton found that the bioactivities of anaesthetic of different chemical structures increased with the enlargement of their partition coefficients of oil-water. After the World War Ⅱ, the research on structure-activity relationship has been developed rapidly. In 1961, Hansch method was applied to the investigation of the analytic relationship between the bioactivities of the growth hormone of the plant and the effect of the substituents of their compounds.展开更多
Let P: C<sup>n</sup>→C<sup>n</sup> be an analogous polynomial system, where C<sup>n</sup> is the n-dimensional complex space. By an analogous polynomial system, we mean that each o...Let P: C<sup>n</sup>→C<sup>n</sup> be an analogous polynomial system, where C<sup>n</sup> is the n-dimensional complex space. By an analogous polynomial system, we mean that each of its components is a finite sum of terms aZ<sub>1</sub><sup>β</sup>1…Z<sub>n</sub><sup>β</sup>n, where a is a complex number, Z<sub>j</sub> a complex variable, and β<sub>j</sub> a nonnegative real number, j=1,…, n. For leach term in each component, consider the sum β<sub>1</sub>+…+β<sub>n</sub>. Let a<sub>j</sub> be the maximum展开更多
Ⅰ. INTRODUCTION With the development of studies on biological nitrogen fixation, the investigation on the micro-circumstances of active centers in metalloenzyme has reached the
We propose a method to generate specially shaped high-order singular beams of pre-designed intensity distributions. Such a method does not a priori assume a phase formula, but rather relies on the 'cake-cutting an...We propose a method to generate specially shaped high-order singular beams of pre-designed intensity distributions. Such a method does not a priori assume a phase formula, but rather relies on the 'cake-cutting and assembly' approach to achieve the azimuthal phase gradient for beam shaping, inspired by the orbital motion trajectory change of an artificial satellite. Based on our method, several typical vortex beams with desired intensity patterns are experimentally generated. As an example, we realize optical trapping and transportation of microorganisms with a triangle-shaped vortex beam, demonstrating the applicability of such unconventional vortex beams in optical trapping and manipulation.展开更多
Prussian blue analogs(PBAs)have emerged as environmentally friendly and structurally tunable cathode materials for aqueous ammonium-ion batteries(AIBs).However,the fundamental role of crystalline H_(2)O in regulating ...Prussian blue analogs(PBAs)have emerged as environmentally friendly and structurally tunable cathode materials for aqueous ammonium-ion batteries(AIBs).However,the fundamental role of crystalline H_(2)O in regulating ammonium-ion storage and transport remains poorly understood.In this study,we present a comprehensive comparison between hydrated NH_(4)NiHCF-H_(2)O and its anhydrous counterpart NH_(4)NiHCF,revealing the critical contribution of interstitial water to electrochemical performance.Structural and spectroscopic analyses confirm that interstitial water forms robust hydrogen bonds with NH_(4)+ions,stabilizing the PBA framework and mitigating structural degradation during cycling.Electrochemical measurements show that NH_(4)NiHCF-H_(2)O delivers a significantly higher specific capacity of 61 mA h g^(−1)at 0.2 C and markedly improved rate performance compared to NH_(4)NiHCF(48 mA h g^(−1)at 0.2 C).Kinetic analysis reveals that interstitial water enhances NH_(4)+diffusion,as evidenced by higher diffusion coefficients.Furthermore,density functional theory(DFT)calculations demonstrate that crystal water acts as a hydrogen bond acceptor,preferentially interacting with NH_(4)+and reducing the migration energy barrier,thereby facilitating fast ion transport.This work provides fundamental insights into the role of crystal water in PBAs and offers a rational design strategy for improving the kinetics,structural stability of PBAs cathodes for AIBs.展开更多
We show that in Schwarzschild equivalent mediums,the massless spin particles obey the same dynamical equation,from which we obtain remarkably simple formulae for the frequencies of the quasibound states.We find that t...We show that in Schwarzschild equivalent mediums,the massless spin particles obey the same dynamical equation,from which we obtain remarkably simple formulae for the frequencies of the quasibound states.We find that the quasibound frequencies of different bosons can be identical at the same quantum number l,and the same is true of different fermions,but a quasibound frequency for bosons can never equal a quasibound frequency for fermions.These results mean that in Schwarzschild equivalent mediums with the quasibound-state boundary conditions,characteristics of electromagnetic waves are the same as those for all the massless bosonic waves,thereby allowing electromagnetic waves to simulate gravitational waves.Our predictions can be tested in future experiments,building upon the successful preparation of Schwarzschild equivalent mediums.展开更多
The India-Asia collision resulted in the formation of Qinghai-Tibet Plateau.Lower crustal flow model was proposed to explain the mechanism of Cenozoic tectonic deformation of Qinghai-Tibet Plateau.In this study,we pro...The India-Asia collision resulted in the formation of Qinghai-Tibet Plateau.Lower crustal flow model was proposed to explain the mechanism of Cenozoic tectonic deformation of Qinghai-Tibet Plateau.In this study,we propose a new approach by combining centrifugal analog modeling with numerical simulation to simulate the tectonic uplift history of the plateau based on the lower crustal flow model,and to investigate the material migration characteristics and the influence of crustal motion velocity and ductile layer viscosity on the plateau tectonic geomorphology.The models reproduce steep-sided flat-topped geomorphic features and clockwise rotation of the material at eastern Himalayan Syntaxis,verifying the rationality of the models.The results show that the greater the crustal motion velocity and the greater the ductile layer viscosity,the steeper the terrain change;and conversely,the smaller the crustal motion velocity and the smaller the ductile layer viscosity,the gentler the terrain change.This study further indicates that the weak lower crust plays an important role in the formation of geomorphic features and material migration characteristics of Qinghai-Tibet Plateau,and provides a new insight for the study of the uplift mechanism of the Tibetan Plateau.展开更多
Objective:To explore the application effect of digital intraoral scanning impression technique in oral implant restoration for periodontitis patients and analyze its impact on patients’Visual Analogue Scale(VAS)score...Objective:To explore the application effect of digital intraoral scanning impression technique in oral implant restoration for periodontitis patients and analyze its impact on patients’Visual Analogue Scale(VAS)scores.Methods:A total of 80 periodontitis patients who received implant restoration in our hospital from May 2023 to May 2025 were selected as research subjects.They were randomly divided into an observation group and a control group using a random number table method,with 40 cases in each group.The observation group used the digital intraoral scanning impression technique to obtain impressions,while the control group used the traditional silicone rubber impression technique.The impression-taking time,the number of prostheses try-ins,implant survival rate,periodontal health indicators(probing depth,gingival index,bleeding index),and VAS scores(pain during treatment and comfort after restoration)were compared between the two groups.Results:The observation group was superior to the control group in terms of impression-taking time,the number of prostheses try-ins,and implant survival rate(p<0.05).Six months after restoration,the improvement in periodontal health indicators in the observation group was significantly better than that in the control group(p<0.05).In addition,the pain VAS score of the observation group during treatment was lower than that of the control group,and the comfort VAS score after restoration was higher than that of the control group(p<0.05).Conclusion:Digital intraoral scanning impression technology can effectively enhance the efficiency and success rate of implant restoration in periodontitis patients,improve periodontal health,alleviate patients’discomfort during treatment,and increase post-restoration comfort,demonstrating high clinical application value.展开更多
In recent years, the investigation of biological nitrogen fixation and analogy to biological nitrogen fixation are a very active field and the researches for micro-surroundings of active centre in metalloenzyme have r...In recent years, the investigation of biological nitrogen fixation and analogy to biological nitrogen fixation are a very active field and the researches for micro-surroundings of active centre in metalloenzyme have reached atomic level at home and abroad. It is known from the results of research of Fe-Mo-S clusters synthesized that FeS2Mo four-element ring formed by MOS4-2展开更多
Electron spin resonance (ESR) technique has been widely used as a modern biophysicalmethod in every field of life science. Spin probe method is a special ESR technique. Inorder to extend the biological application of ...Electron spin resonance (ESR) technique has been widely used as a modern biophysicalmethod in every field of life science. Spin probe method is a special ESR technique. Inorder to extend the biological application of the spin probe method.a nitroxide radicalanalogous to imidazole F was synthesized:展开更多
基金supported by the National Natural Science Foundation of China (Nos.12004002 and 12274151)Anhui Provincial Natural Science Foundation (No.1908085QF251)Foundation for Introduction of High-Level Talents of Anhui University (No.S020118002/061).
文摘Exploring zinc-free anode materials is one of the effective strategies to get the zinc dendrites problem of flexible zinc ion battery(ZIB)solved.In this work,an analogous heterostructure(AHS)is constructed from the excellent MXene(Ti_(3)C_(2)T_(x))and TiSe_(2) nanosheets.The AHS not only possesses numerous diffu-sion paths and Zn^(2+)storage sites but also possesses a stable conductive network to accelerate charge transfer in the electrode.As a collaborative advantage,electrochemical measurement results show that MXene/TiSe_(2) electrodes display an excellent specific capacity of 177.9 mAh g^(-1) at 0.10 A g^(-1) and a long-term cycling stability of 77.4%capacity retention after 400 cycles.DFT computations further demon-strate the excellent performance of MXene/TiSe_(2) electrodes including desirable electronic conductivity and low Zn^(2+)migration barriers.The assembled flexible ZIB not only delivers a good specific capacity of 42.2μAh cm^(-2) at 0.20 mA cm^(-2) and a competitive energy density of 37.4μWh cm^(-2) but also exhibits excellent flexibility and thermostability.Furthermore,after 400 cycles at 0.60 A g^(-1),flexible ZIB shows a capacity retention of 73.8%.This work gives a successful attempt to design 2D layered materials as Zn metal-free anode for flexible ZIB.
基金support of this work by the National Natural Science Foundation of China(No.81430094 and 81173522)the National Key Technology R&D Program(2008BAI51B01).
文摘Objective:Used extensively to treat cardiovascular disease,Danqi analogous formulas(DQAF)include prescriptions for Danqi(DQ),Fufang Danshen(FFDS)and Qishen Yiqi(QSYQ).Differences in prescription compatibility result in varying emphases of DQAF in clinical application.Methods and results:Based on network analysis in this study,common and distinct mechanisms of DQAF actions on cardiovascular disease were analyzed at a systemic level.Components etargetsepathways models were developed by Cytoscape(http://www.cytoscape.org/);whereby,target information for active compounds was obtained based on the PharmMapper database(http://59.78.96.61/pharmmapper/),which was further used to search pathways using the Kyoto Encyclopedia of Genes and Genomes database(http://www.genome.jp/kegg/).Based on target and network analyses,we discovered RBP4 is a potential common target of DQAF,while mitogen-activated protein kinase 1(MAPK1)and glutathione S-transferase P were potential targets of FFDS and QSYQ,respectively.Furthermore,the potential of DQAF to treat cardiovascular disease occurs through effects on the endocrine,immune,and digestive systems,in addition to lipid,sugar and amino acid metabolic pathways.Whereas FFDS exhibits effects on Toll-like receptor,transforming growth factor beta and MAPK signaling pathways;QSYQ exerts effects on cyclic adenosine monophosphate signaling,as well as metabolism of glutathione and arachidonic acid.
基金National Natural Science Foundation of China under Grant No.10575017
文摘Transmitting quantum states by channels of analogous Bell states is studied in this paper. We analyze the transmitting process. constructed the probabilitic unitary operator, and gain the largest successful transfer quantum state probability.
基金Supported by NSFC(No.12126357)Natural Science Basic Research Plan in Shaanxi Province of China(No.2023-JC-QN-0058)。
文摘The main purpose of this paper is using the properties of the classical Gauss sum and the analytic methods to study the computational problem of one kind of hybrid power mean involving the character sum of polynomials and a sum analogous to Kloosterman sum mod p,an odd prime,and give two sharp asymptotic formulae for them.
基金funded by the National Natural Science Foundation of China(52067013),and the Provincial Natural Science Foundation of Gansu(20JR5RA395).
文摘In the DC microgrid,the lack of inertia and damping in power electronic converters results in poor stability of DC bus voltage and low inertia of the DC microgrid during fluctuations in load and photovoltaic power.To address this issue,the application of a virtual synchronous generator(VSG)in grid-connected inverters control is referenced and proposes a control strategy called the analogous virtual synchronous generator(AVSG)control strategy for the interface DC/DC converter of the battery in the microgrid.Besides,a flexible parameter adaptive control method is introduced to further enhance the inertial behavior of the AVSG control.Firstly,a theoretical analysis is conducted on the various components of the DC microgrid,the structure of analogous virtual synchronous generator,and the control structure’s main parameters related to the DC microgrid’s inertial behavior.Secondly,the voltage change rate tracking coefficient is introduced to adjust the change of the virtual capacitance and damping coefficient flexibility,which further strengthens the inertia trend of the DC microgrid.Additionally,a small-signal modeling approach is used to analyze the approximate range of the AVSG’s main parameters ensuring system stability.Finally,conduct a simulation analysis by building the model of the DC microgrid system with photovoltaic(PV)and battery energy storage(BES)in MATLAB/Simulink.Simulation results from different scenarios have verified that the AVSG control introduces fixed inertia and damping into the droop control of the battery,resulting in a certain level of inertia enhancement.Furthermore,the additional adaptive control strategy built upon the AVSG control provides better and flexible inertial support for the DC microgrid,further enhances the stability of the DC bus voltage,and has a more positive impact on the battery performance.
文摘Root Analogous Municipal Solid Waste System “RA-MSW” is a novel management system that manages waste, biogas, and leachate in bioreactor landfill. Different than conventional disposal at landfills, waste is penetrated by synthetic roots that serve dual mission for biogas collection and leachate recirculation. RA-MSW roots are permeable hydropho- bic polymer material that are formed on-place or prefabricated at factory from recyclable material available on the dumping area. Since the material is hydrophobic, it does not contain water in the voids providing more space for gas transport and collection. The roots are also interchangeably used for leachate recirculation where the parameters of wa- ter content, nutrients, pH, and temperature are optimized to enhance biogas production simultaneously with leachate treatment. RA-MSW provides new approach of waste management and control;it has new virtues of landfill operation;new material medium for biogas collection;new biocell design configuration;new manipulation for leachate and biogas. The approach adds new merits for solid waste management, bio-energy utilization, and the concept of 5 R’s cycle for MSW management.
文摘In the 21^(st)century,at a global level,energy and environment are the most important issues.The green approach to solve these issues is photocatalysis.In this regard,perovskite-based materials owing to their inexpensiveness and non-toxicity have attracted significant interest.The photocatalytic activity of perovskite and layered perovskite needs some modification to provide better activity than that of the neat one.The modification can be done by replacing cations,formation of heterojunctions or formation of composites.This critical review presents and discusses the current development of perovskite,layered perovskite,and their composites especially withπ-conjugated carbon materials towards photocatalytic applications.After introduction of the synthesis methods of perovskite and layered perovskite as well as their properties,we focus on the description of various methods to synthesize their composites,mainly those with graphene,carbon nano-tubes and carbon nitrides.Particular importance is placed on strategies for the optimization of composite properties.Lastly,the advantages of perovskite and layered perovskite based composites in applications such as photocatalytic H2 production and pollutant degradation are described in detail.
基金This research was supported by the Doctor Station Funds of National Education Committee 32860410.
文摘In this paper, the dynamical forming mechanism of analogous rhythm phenomenon is studied by using a coupled ocean-atmosphere model in form of analogous discrepance. The results show that the analogous rhythm is non-uniform oscillation of analogous discrepance disturbance which is caused by the nonlinear coupled interaction of ocean-air system and the seasonal variation of monthly mean circulation. Then, the numerical simulations and sensitivity studies are conducted by using a global coupled ocean-atmosphere dynamical-statistical seasonal long-range numerical prediction model, the results not only prove the result of theoretical analysis, but also provide the basis of making seasonal long-range numerical prediction by using this model.
文摘In 1867, Crambrown supposed that correlation existed between the bioactivity of drugs and features of their chemical structures. Later, in 1900, overton found that the bioactivities of anaesthetic of different chemical structures increased with the enlargement of their partition coefficients of oil-water. After the World War Ⅱ, the research on structure-activity relationship has been developed rapidly. In 1961, Hansch method was applied to the investigation of the analytic relationship between the bioactivities of the growth hormone of the plant and the effect of the substituents of their compounds.
文摘Let P: C<sup>n</sup>→C<sup>n</sup> be an analogous polynomial system, where C<sup>n</sup> is the n-dimensional complex space. By an analogous polynomial system, we mean that each of its components is a finite sum of terms aZ<sub>1</sub><sup>β</sup>1…Z<sub>n</sub><sup>β</sup>n, where a is a complex number, Z<sub>j</sub> a complex variable, and β<sub>j</sub> a nonnegative real number, j=1,…, n. For leach term in each component, consider the sum β<sub>1</sub>+…+β<sub>n</sub>. Let a<sub>j</sub> be the maximum
文摘Ⅰ. INTRODUCTION With the development of studies on biological nitrogen fixation, the investigation on the micro-circumstances of active centers in metalloenzyme has reached the
基金National Key R&D Program of China(2017YFA0303800)National Natural Science Foundation of China(11674180,91750204)+1 种基金PCSIRT(IRT_13R29)Higher Education Discipline Innovation Project(B07013)
文摘We propose a method to generate specially shaped high-order singular beams of pre-designed intensity distributions. Such a method does not a priori assume a phase formula, but rather relies on the 'cake-cutting and assembly' approach to achieve the azimuthal phase gradient for beam shaping, inspired by the orbital motion trajectory change of an artificial satellite. Based on our method, several typical vortex beams with desired intensity patterns are experimentally generated. As an example, we realize optical trapping and transportation of microorganisms with a triangle-shaped vortex beam, demonstrating the applicability of such unconventional vortex beams in optical trapping and manipulation.
基金supported by the National Natural Science Foundation of China (52172227)the Natural Science Foundation of Hubei Province (2023AFA114)+2 种基金the Guizhou Provincial Key Technology R&D Program (ZD[2025]019)provided by the Startup Fund (20QD80 and 22QD28)support from the Science&Technology Top Talents Program of Guizhou Province ([2024]349)
文摘Prussian blue analogs(PBAs)have emerged as environmentally friendly and structurally tunable cathode materials for aqueous ammonium-ion batteries(AIBs).However,the fundamental role of crystalline H_(2)O in regulating ammonium-ion storage and transport remains poorly understood.In this study,we present a comprehensive comparison between hydrated NH_(4)NiHCF-H_(2)O and its anhydrous counterpart NH_(4)NiHCF,revealing the critical contribution of interstitial water to electrochemical performance.Structural and spectroscopic analyses confirm that interstitial water forms robust hydrogen bonds with NH_(4)+ions,stabilizing the PBA framework and mitigating structural degradation during cycling.Electrochemical measurements show that NH_(4)NiHCF-H_(2)O delivers a significantly higher specific capacity of 61 mA h g^(−1)at 0.2 C and markedly improved rate performance compared to NH_(4)NiHCF(48 mA h g^(−1)at 0.2 C).Kinetic analysis reveals that interstitial water enhances NH_(4)+diffusion,as evidenced by higher diffusion coefficients.Furthermore,density functional theory(DFT)calculations demonstrate that crystal water acts as a hydrogen bond acceptor,preferentially interacting with NH_(4)+and reducing the migration energy barrier,thereby facilitating fast ion transport.This work provides fundamental insights into the role of crystal water in PBAs and offers a rational design strategy for improving the kinetics,structural stability of PBAs cathodes for AIBs.
基金supported by the National Natural Science Foundation of China under Grant No.12175198。
文摘We show that in Schwarzschild equivalent mediums,the massless spin particles obey the same dynamical equation,from which we obtain remarkably simple formulae for the frequencies of the quasibound states.We find that the quasibound frequencies of different bosons can be identical at the same quantum number l,and the same is true of different fermions,but a quasibound frequency for bosons can never equal a quasibound frequency for fermions.These results mean that in Schwarzschild equivalent mediums with the quasibound-state boundary conditions,characteristics of electromagnetic waves are the same as those for all the massless bosonic waves,thereby allowing electromagnetic waves to simulate gravitational waves.Our predictions can be tested in future experiments,building upon the successful preparation of Schwarzschild equivalent mediums.
基金supported by Excellent Research Group Project for Multiphase Evolution in Hyper-Gravity of the National Natural Science Foundation of China(No.52588202)。
文摘The India-Asia collision resulted in the formation of Qinghai-Tibet Plateau.Lower crustal flow model was proposed to explain the mechanism of Cenozoic tectonic deformation of Qinghai-Tibet Plateau.In this study,we propose a new approach by combining centrifugal analog modeling with numerical simulation to simulate the tectonic uplift history of the plateau based on the lower crustal flow model,and to investigate the material migration characteristics and the influence of crustal motion velocity and ductile layer viscosity on the plateau tectonic geomorphology.The models reproduce steep-sided flat-topped geomorphic features and clockwise rotation of the material at eastern Himalayan Syntaxis,verifying the rationality of the models.The results show that the greater the crustal motion velocity and the greater the ductile layer viscosity,the steeper the terrain change;and conversely,the smaller the crustal motion velocity and the smaller the ductile layer viscosity,the gentler the terrain change.This study further indicates that the weak lower crust plays an important role in the formation of geomorphic features and material migration characteristics of Qinghai-Tibet Plateau,and provides a new insight for the study of the uplift mechanism of the Tibetan Plateau.
文摘Objective:To explore the application effect of digital intraoral scanning impression technique in oral implant restoration for periodontitis patients and analyze its impact on patients’Visual Analogue Scale(VAS)scores.Methods:A total of 80 periodontitis patients who received implant restoration in our hospital from May 2023 to May 2025 were selected as research subjects.They were randomly divided into an observation group and a control group using a random number table method,with 40 cases in each group.The observation group used the digital intraoral scanning impression technique to obtain impressions,while the control group used the traditional silicone rubber impression technique.The impression-taking time,the number of prostheses try-ins,implant survival rate,periodontal health indicators(probing depth,gingival index,bleeding index),and VAS scores(pain during treatment and comfort after restoration)were compared between the two groups.Results:The observation group was superior to the control group in terms of impression-taking time,the number of prostheses try-ins,and implant survival rate(p<0.05).Six months after restoration,the improvement in periodontal health indicators in the observation group was significantly better than that in the control group(p<0.05).In addition,the pain VAS score of the observation group during treatment was lower than that of the control group,and the comfort VAS score after restoration was higher than that of the control group(p<0.05).Conclusion:Digital intraoral scanning impression technology can effectively enhance the efficiency and success rate of implant restoration in periodontitis patients,improve periodontal health,alleviate patients’discomfort during treatment,and increase post-restoration comfort,demonstrating high clinical application value.
文摘In recent years, the investigation of biological nitrogen fixation and analogy to biological nitrogen fixation are a very active field and the researches for micro-surroundings of active centre in metalloenzyme have reached atomic level at home and abroad. It is known from the results of research of Fe-Mo-S clusters synthesized that FeS2Mo four-element ring formed by MOS4-2
基金Project supported by the National Natural Science Foundation of China.
文摘Electron spin resonance (ESR) technique has been widely used as a modern biophysicalmethod in every field of life science. Spin probe method is a special ESR technique. Inorder to extend the biological application of the spin probe method.a nitroxide radicalanalogous to imidazole F was synthesized:
