[Pb（HL）（phen）]n （1） and [Cd3L2（phen）]n （2）, where phen = 1,10-phenanthroline and L = 4,4＇-（2-carboxylatopropane-1,3-diyl）dibenzoate, were hydrothermally prepared and fully characterized by X-ray single-cr...[Pb（HL）（phen）]n （1） and [Cd3L2（phen）]n （2）, where phen = 1,10-phenanthroline and L = 4,4＇-（2-carboxylatopropane-1,3-diyl）dibenzoate, were hydrothermally prepared and fully characterized by X-ray single-crystal diffraction, infrared spectroscopy and thermogravimetric analyses. The decomposition temperature of 1 and 2 was measured to be ca. 304 and 416 ℃, respectively. The charge transfer transition based absorption of 1 and 2 was also verified by the powder scattering spectra and theoretical analyses.展开更多
Based on the commonly-used definition of the semi-permeable material(SPM),in which the solvent(such as water)can pass through but the solute cannot move freely,a novel constitutive equation is presented,in this paper,...Based on the commonly-used definition of the semi-permeable material(SPM),in which the solvent(such as water)can pass through but the solute cannot move freely,a novel constitutive equation is presented,in this paper,to theoretically express the intrinsic constitutive relationship between the porosity variation rate with time and the solute concentration variation rate with time.From this theoretical finding,a mathematical model is established to describe the solute concentrationgradient driven water flow and solute concentration variation problem in solution-saturated semi-permeable materials(SSSPMs).In particular,the solute concentration variation in the considered problem can be mathematically described as a linear homogeneous second-order partial differential equation with a variable coefficient in the front of the time term.A special mathematical transform is presented and used to solve this equation,so that the analytical solution for the solute concentration variation in the considered problem has been derived in a purely mathematical manner.The derived analytical solution is then used to provide some theoretical understanding of solute concentration variations in the SSSPM layer.展开更多
This study introduces a MEMS accelerometer equipped with an adaptive tuning system for an electrostatic anti-spring.As the input acceleration increases,the sensitivity of the adaptive MEMS accelerometer decreases to c...This study introduces a MEMS accelerometer equipped with an adaptive tuning system for an electrostatic anti-spring.As the input acceleration increases,the sensitivity of the adaptive MEMS accelerometer decreases to compensate for the measurement range.It leverages the benefits of both conventional open-and closed-loop accelerometer designs.Comprehensive theoretical analyses and experimental tests are conducted,showing consistency between theory and experimental results.In comparison to conventional MEMS accelerometer designs,this novel MEMS accelerometer demonstrates enhanced performance.With an actuation voltage of 15.4 V and under 0 g acceleration input,the sensitivity of the accelerometer improves from 1.28 V/g to 39.43 V/g,and the spring constant is reduced from 41.0 N/m to 1.38 N/m.The noise floor also decreases from 8628 ng/√Hz(at 100 Hz)to 279 ng/√Hz(at 100 Hz).The dynamic range enhances from 127 dB to 157 dB.Besides,a hybrid continuous-time interface is utilized to apply the actuation force on the sensing comb fingers.This approach not only simplifies the circuit design but also minimizes the required die area,power consumption.The combination of these features makes the novel MEMS accelerometer both highly sensitive and large measurement range,as a promising solution for various applications.展开更多
基金supported by the National Natural Science Foundation of China(No.21271033)
文摘[Pb（HL）（phen）]n （1） and [Cd3L2（phen）]n （2）, where phen = 1,10-phenanthroline and L = 4,4＇-（2-carboxylatopropane-1,3-diyl）dibenzoate, were hydrothermally prepared and fully characterized by X-ray single-crystal diffraction, infrared spectroscopy and thermogravimetric analyses. The decomposition temperature of 1 and 2 was measured to be ca. 304 and 416 ℃, respectively. The charge transfer transition based absorption of 1 and 2 was also verified by the powder scattering spectra and theoretical analyses.
基金supported by the National Natural Science Foundation of China(Grant No.42162028).
文摘Based on the commonly-used definition of the semi-permeable material(SPM),in which the solvent(such as water)can pass through but the solute cannot move freely,a novel constitutive equation is presented,in this paper,to theoretically express the intrinsic constitutive relationship between the porosity variation rate with time and the solute concentration variation rate with time.From this theoretical finding,a mathematical model is established to describe the solute concentrationgradient driven water flow and solute concentration variation problem in solution-saturated semi-permeable materials(SSSPMs).In particular,the solute concentration variation in the considered problem can be mathematically described as a linear homogeneous second-order partial differential equation with a variable coefficient in the front of the time term.A special mathematical transform is presented and used to solve this equation,so that the analytical solution for the solute concentration variation in the considered problem has been derived in a purely mathematical manner.The derived analytical solution is then used to provide some theoretical understanding of solute concentration variations in the SSSPM layer.
基金funded by The Science and Technology Development Fund,Macao SAR(FDCT),004/2023/SKLNational Natural Science Foundation of China(No.42204182)Knowledge Innovation Program of Wuhan-Basic Research(No.2023010201010042).
文摘This study introduces a MEMS accelerometer equipped with an adaptive tuning system for an electrostatic anti-spring.As the input acceleration increases,the sensitivity of the adaptive MEMS accelerometer decreases to compensate for the measurement range.It leverages the benefits of both conventional open-and closed-loop accelerometer designs.Comprehensive theoretical analyses and experimental tests are conducted,showing consistency between theory and experimental results.In comparison to conventional MEMS accelerometer designs,this novel MEMS accelerometer demonstrates enhanced performance.With an actuation voltage of 15.4 V and under 0 g acceleration input,the sensitivity of the accelerometer improves from 1.28 V/g to 39.43 V/g,and the spring constant is reduced from 41.0 N/m to 1.38 N/m.The noise floor also decreases from 8628 ng/√Hz(at 100 Hz)to 279 ng/√Hz(at 100 Hz).The dynamic range enhances from 127 dB to 157 dB.Besides,a hybrid continuous-time interface is utilized to apply the actuation force on the sensing comb fingers.This approach not only simplifies the circuit design but also minimizes the required die area,power consumption.The combination of these features makes the novel MEMS accelerometer both highly sensitive and large measurement range,as a promising solution for various applications.
