A novel two dimensional heterometallic coordination polymer, Nd 2Zn 3(EDTA) 3(H 2O) 11 ·12H 2O (EDTA= ethylenediamine N,N,N',N' tetraacetate) was synthesized and characterized. In the compo...A novel two dimensional heterometallic coordination polymer, Nd 2Zn 3(EDTA) 3(H 2O) 11 ·12H 2O (EDTA= ethylenediamine N,N,N',N' tetraacetate) was synthesized and characterized. In the compound, each Nd 3+ is connected to three Zn 2+ through three carboxylate bridges, while each Zn 2+ has two Nd 3+ neighbors. In this way, a macrocycle involving six neodyium and six zinc ions is produced. The cycles are connected each other to form a two dimensional sheet. These sheets are further linked into a three dimensional network by the water molecules between the layers through rich hydrogen bonding.展开更多
Interaction between current and underwater bottom topography leads to roughness of the sea surface, which in turn yields variation of the radar scattering echo. By using the continuity equation and weak hydrodynamic i...Interaction between current and underwater bottom topography leads to roughness of the sea surface, which in turn yields variation of the radar scattering echo. By using the continuity equation and weak hydrodynamic interaction theory in the relaxation time approximation, the spatial variation of the radar scattering cross-section has been proved as proportional to the gradient of current velocity. The current direction is first determined by using two-dimensional (2-D) correlation of spatial variation of backscattering measured by the SAR imagery, as the priori knowledge of the current direction is not available. The inverse algorithm to successively derive 2 - D underwater bottom topography from the SAR imagery is developed. As an application, the SAR SIR- C image over the sea area of Hong Kong, China is studied.展开更多
Herein,we report a novel sensor to detect trypsin using a purpose-designed fluorescein-labelled peptide with negatively charged carbon nanoparticles(CNPs)modified by acid oxidation.The fluorescence of the fluorescein-...Herein,we report a novel sensor to detect trypsin using a purpose-designed fluorescein-labelled peptide with negatively charged carbon nanoparticles(CNPs)modified by acid oxidation.The fluorescence of the fluorescein-labelled peptide was quenched by CNPs.The sensor reacted with trypsin to cleave the peptide,resulting in the release of the dye moiety and a substantial increase in fluorescence intensity,which was dose-and time-dependent,and trypsin could be quantified accordingly.Correspondingly,the biosensor has led to the development of a convenient and efficient fluorescent method to measure trypsin activity,with a detection limit of 0.7 mg/mL.The method allows rapid determination of trypsin activity in the normal and acute pancreatitis range,suitable for point-of-care testing.Furthermore,the applicability of the method has been demonstrated by detecting trypsin in spiked urine samples.展开更多
For building Global Energy Interconnection(GEI), it is necessary to implement new breakthroughs on largepower system simulation. Key routes for implementing full electromagnetic transient simulation of large-power sys...For building Global Energy Interconnection(GEI), it is necessary to implement new breakthroughs on largepower system simulation. Key routes for implementing full electromagnetic transient simulation of large-power systems are described in this paper, and a top framework is designed. A combination of the new large time step algorithm and the traditional small-time step algorithm is proposed where both parts A and B are calculated independently. The method for integrating the Norton equivalence of the power electronic system to the entire power grid is proposed. A two-level gird division structure is proposed, which executes a multi-rate parallel calculation among subsystems and element parallel calculation in each subsystem. The initialization method of combining load flow derivation and automatic trial-and-error launching is introduced. The feasibility of the method is demonstrated through a practical power grid example, which lays a foundation for further research.展开更多
The metabolic rate of Japanese sea bass, Lateolabrax japonicus (C & V), was estimated in laboratory at temperature 25.2±0.5℃. The fresh weight of the fish was 4.64-52.28 g (average of 17.81±0.33 g). The...The metabolic rate of Japanese sea bass, Lateolabrax japonicus (C & V), was estimated in laboratory at temperature 25.2±0.5℃. The fresh weight of the fish was 4.64-52.28 g (average of 17.81±0.33 g). The routine metabolism was related to body weight by the exponential equation: R r =14.966 W 0.74 ( r =0.934). The rate of feeding metabolism increased linearly with food consumption. Feeding metabolic rate was 1.8-2.4 times the routine metabolic rate.展开更多
The aim of seismic data inversion is to assess the physical parameters (including density, elastic parameters and viscous elastic parameters). Defining the best assessing value to be a kind of parameters set, it is si...The aim of seismic data inversion is to assess the physical parameters (including density, elastic parameters and viscous elastic parameters). Defining the best assessing value to be a kind of parameters set, it is simulated that the synthesized seismic records are the most fit to those which were recorded in fields. A new way of directly inversion for elastic parameters has been brought forward in the context. It is suitable to the inversion of elastic parameters in anisotropic media (HTI). It is totally different from those depicted in the previous approaches. In order to classify the strata properties, it utilizes both PP wave and PSV wave to inverse the strata elastic parameters (C11 and C33). It could be called as the inversion of elastic wave equation.展开更多
文摘A novel two dimensional heterometallic coordination polymer, Nd 2Zn 3(EDTA) 3(H 2O) 11 ·12H 2O (EDTA= ethylenediamine N,N,N',N' tetraacetate) was synthesized and characterized. In the compound, each Nd 3+ is connected to three Zn 2+ through three carboxylate bridges, while each Zn 2+ has two Nd 3+ neighbors. In this way, a macrocycle involving six neodyium and six zinc ions is produced. The cycles are connected each other to form a two dimensional sheet. These sheets are further linked into a three dimensional network by the water molecules between the layers through rich hydrogen bonding.
基金National Natural Science Foundation of China Under contract Nos 49831060, 69771007,and National 863 - 818 - 06 - 05.
文摘Interaction between current and underwater bottom topography leads to roughness of the sea surface, which in turn yields variation of the radar scattering echo. By using the continuity equation and weak hydrodynamic interaction theory in the relaxation time approximation, the spatial variation of the radar scattering cross-section has been proved as proportional to the gradient of current velocity. The current direction is first determined by using two-dimensional (2-D) correlation of spatial variation of backscattering measured by the SAR imagery, as the priori knowledge of the current direction is not available. The inverse algorithm to successively derive 2 - D underwater bottom topography from the SAR imagery is developed. As an application, the SAR SIR- C image over the sea area of Hong Kong, China is studied.
文摘Herein,we report a novel sensor to detect trypsin using a purpose-designed fluorescein-labelled peptide with negatively charged carbon nanoparticles(CNPs)modified by acid oxidation.The fluorescence of the fluorescein-labelled peptide was quenched by CNPs.The sensor reacted with trypsin to cleave the peptide,resulting in the release of the dye moiety and a substantial increase in fluorescence intensity,which was dose-and time-dependent,and trypsin could be quantified accordingly.Correspondingly,the biosensor has led to the development of a convenient and efficient fluorescent method to measure trypsin activity,with a detection limit of 0.7 mg/mL.The method allows rapid determination of trypsin activity in the normal and acute pancreatitis range,suitable for point-of-care testing.Furthermore,the applicability of the method has been demonstrated by detecting trypsin in spiked urine samples.
基金supported by key project of smart grid technology and equipment of national key research and development plan of China (2016YFB0900601)
文摘For building Global Energy Interconnection(GEI), it is necessary to implement new breakthroughs on largepower system simulation. Key routes for implementing full electromagnetic transient simulation of large-power systems are described in this paper, and a top framework is designed. A combination of the new large time step algorithm and the traditional small-time step algorithm is proposed where both parts A and B are calculated independently. The method for integrating the Norton equivalence of the power electronic system to the entire power grid is proposed. A two-level gird division structure is proposed, which executes a multi-rate parallel calculation among subsystems and element parallel calculation in each subsystem. The initialization method of combining load flow derivation and automatic trial-and-error launching is introduced. The feasibility of the method is demonstrated through a practical power grid example, which lays a foundation for further research.
文摘The metabolic rate of Japanese sea bass, Lateolabrax japonicus (C & V), was estimated in laboratory at temperature 25.2±0.5℃. The fresh weight of the fish was 4.64-52.28 g (average of 17.81±0.33 g). The routine metabolism was related to body weight by the exponential equation: R r =14.966 W 0.74 ( r =0.934). The rate of feeding metabolism increased linearly with food consumption. Feeding metabolic rate was 1.8-2.4 times the routine metabolic rate.
基金State Natural Science Foundation of China (49774225).
文摘The aim of seismic data inversion is to assess the physical parameters (including density, elastic parameters and viscous elastic parameters). Defining the best assessing value to be a kind of parameters set, it is simulated that the synthesized seismic records are the most fit to those which were recorded in fields. A new way of directly inversion for elastic parameters has been brought forward in the context. It is suitable to the inversion of elastic parameters in anisotropic media (HTI). It is totally different from those depicted in the previous approaches. In order to classify the strata properties, it utilizes both PP wave and PSV wave to inverse the strata elastic parameters (C11 and C33). It could be called as the inversion of elastic wave equation.
