The Experts below are selected from a list of 426762 Experts worldwide ranked by ideXlab platform
Chunsheng Yang - One of the best experts on this subject based on the ideXlab platform.
-
high performance bimorph piezoelectric mems harvester via bulk pzt thick films on thin beryllium bronze substrate
Applied Physics Letters, 2017Co-Authors: Zhiran Yi, Xiaolin Wang, Bin Yang, Guimiao Li, Xiang Chen, Chunsheng YangAbstract:This letter presents a high performance bimorph piezoelectric MEMS harvester with bulk PZT thick films on both sides of a flexible thin beryllium-bronze substrate via bonding and thinning technologies. The upper and lower PZT layers are thinned down to about 53 μm and 76 μm, respectively, and a commercial beryllium bronze with the thickness of about 50 μm is used as the substrate. The effective volume of this device is 30.6 mm3. The harvester with a tungsten proof mass generated the close-circuit peak-to-peak voltage of 53.1 V, the output power of 0.979 mW, and the power density of 31.99 mW/cm3 with the matching load resistance of 360 kΩ at the Applied acceleration amplitude of 3.5 g and the Applied Frequency of 77.2 Hz. Meanwhile, in order to evaluate the stability, the device was measured continuously under Applied acceleration amplitudes of 1.0 g and 3.5 g for one hour and demonstrated a good stability. Then, the harvester was utilized to light up LEDs and about twenty-one serial LEDs were lighted up a...
-
high performance bimorph piezoelectric mems harvester via bulk pzt thick films on thin beryllium bronze substrate
Applied Physics Letters, 2017Co-Authors: Bin Yang, Xiaolin Wang, Xiang Chen, Jingquan Liu, Chunsheng YangAbstract:This letter presents a high performance bimorph piezoelectric MEMS harvester with bulk PZT thick films on both sides of a flexible thin beryllium-bronze substrate via bonding and thinning technologies. The upper and lower PZT layers are thinned down to about 53 μm and 76 μm, respectively, and a commercial beryllium bronze with the thickness of about 50 μm is used as the substrate. The effective volume of this device is 30.6 mm3. The harvester with a tungsten proof mass generated the close-circuit peak-to-peak voltage of 53.1 V, the output power of 0.979 mW, and the power density of 31.99 mW/cm3 with the matching load resistance of 360 kΩ at the Applied acceleration amplitude of 3.5 g and the Applied Frequency of 77.2 Hz. Meanwhile, in order to evaluate the stability, the device was measured continuously under Applied acceleration amplitudes of 1.0 g and 3.5 g for one hour and demonstrated a good stability. Then, the harvester was utilized to light up LEDs and about twenty-one serial LEDs were lighted up a...
Bin Yang - One of the best experts on this subject based on the ideXlab platform.
-
a gullwing structured piezoelectric rotational energy harvester for low Frequency energy scavenging
Applied Physics Letters, 2019Co-Authors: Bin Yang, Gang Tang, Jingquan LiuAbstract:A gullwing-structural piezoelectric energy harvester mainly consisting of two typical nonlinear buckled-bridges is proposed to effectively scavenge low-Frequency rotational kinetic energy based on a gear mechanism induced interwell oscillation. A natural buckled piezoelectric unit and a flexible polymer substrate are used for the buckled-bridge. A thinned bulk lead zirconate titanate ceramic is employed for the piezoelectric layer in consideration of its excellent electromechanical factor. The presented harvester can generate a peak open-circuit voltage of 20 V at a rotational Frequency of 7.8 Hz, which has a low dependence on the Applied Frequency. A 100 μF capacitor reaches a charging voltage of 14.7 V after 38 s and is saturated at 16.05 V for 122 s. Through the power management circuit, the harvester generates an output power of 0.4 mW and the effective power density of 6.54 μW mm−3 at the low rotational Frequency. These results indicate that this strategy is promising for self-powered sensors, especially at changeable and low-Frequency ambient, such as tire pressure monitoring.
-
high performance bimorph piezoelectric mems harvester via bulk pzt thick films on thin beryllium bronze substrate
Applied Physics Letters, 2017Co-Authors: Zhiran Yi, Xiaolin Wang, Bin Yang, Guimiao Li, Xiang Chen, Chunsheng YangAbstract:This letter presents a high performance bimorph piezoelectric MEMS harvester with bulk PZT thick films on both sides of a flexible thin beryllium-bronze substrate via bonding and thinning technologies. The upper and lower PZT layers are thinned down to about 53 μm and 76 μm, respectively, and a commercial beryllium bronze with the thickness of about 50 μm is used as the substrate. The effective volume of this device is 30.6 mm3. The harvester with a tungsten proof mass generated the close-circuit peak-to-peak voltage of 53.1 V, the output power of 0.979 mW, and the power density of 31.99 mW/cm3 with the matching load resistance of 360 kΩ at the Applied acceleration amplitude of 3.5 g and the Applied Frequency of 77.2 Hz. Meanwhile, in order to evaluate the stability, the device was measured continuously under Applied acceleration amplitudes of 1.0 g and 3.5 g for one hour and demonstrated a good stability. Then, the harvester was utilized to light up LEDs and about twenty-one serial LEDs were lighted up a...
-
high performance bimorph piezoelectric mems harvester via bulk pzt thick films on thin beryllium bronze substrate
Applied Physics Letters, 2017Co-Authors: Bin Yang, Xiaolin Wang, Xiang Chen, Jingquan Liu, Chunsheng YangAbstract:This letter presents a high performance bimorph piezoelectric MEMS harvester with bulk PZT thick films on both sides of a flexible thin beryllium-bronze substrate via bonding and thinning technologies. The upper and lower PZT layers are thinned down to about 53 μm and 76 μm, respectively, and a commercial beryllium bronze with the thickness of about 50 μm is used as the substrate. The effective volume of this device is 30.6 mm3. The harvester with a tungsten proof mass generated the close-circuit peak-to-peak voltage of 53.1 V, the output power of 0.979 mW, and the power density of 31.99 mW/cm3 with the matching load resistance of 360 kΩ at the Applied acceleration amplitude of 3.5 g and the Applied Frequency of 77.2 Hz. Meanwhile, in order to evaluate the stability, the device was measured continuously under Applied acceleration amplitudes of 1.0 g and 3.5 g for one hour and demonstrated a good stability. Then, the harvester was utilized to light up LEDs and about twenty-one serial LEDs were lighted up a...
Sonia Coriani - One of the best experts on this subject based on the ideXlab platform.
-
a density matrix based quasienergy formulation of the kohn sham density functional response theory using perturbation and time dependent basis sets
Journal of Chemical Physics, 2008Co-Authors: Andreas J Thorvaldsen, Poul Jørgensen, Kenneth Ruud, Kasper Kristensen, Sonia CorianiAbstract:A general method is presented for the calculation of molecular properties to arbitrary order at the Kohn–Sham density functional level of theory. The quasienergy and Lagrangian formalisms are combined to derive response functions and their residues by straightforward differentiation of the quasienergy derivative Lagrangian using the elements of the density matrix in the atomic orbital representation as variational parameters. Response functions and response equations are expressed in the atomic orbital basis, allowing recent advances in the field of linear-scaling methodology to be used. Time-dependent and static perturbations are treated on an equal footing, and atomic basis sets that depend on the Applied Frequency-dependent perturbations may be used, e.g., Frequency-dependent London atomic orbitals. The 2n+1 rule may be Applied if computationally favorable, but alternative formulations using higher-order perturbed density matrices are also derived. These may be advantageous in order to minimize the num...
-
a density matrix based quasienergy formulation of the kohn sham density functional response theory using perturbation and time dependent basis sets
Journal of Chemical Physics, 2008Co-Authors: Andreas J Thorvaldsen, Poul Jørgensen, Kenneth Ruud, Kasper Kristensen, Sonia CorianiAbstract:A general method is presented for the calculation of molecular properties to arbitrary order at the Kohn-Sham density functional level of theory. The quasienergy and Lagrangian formalisms are combined to derive response functions and their residues by straightforward differentiation of the quasienergy derivative Lagrangian using the elements of the density matrix in the atomic orbital representation as variational parameters. Response functions and response equations are expressed in the atomic orbital basis, allowing recent advances in the field of linear-scaling methodology to be used. Time-dependent and static perturbations are treated on an equal footing, and atomic basis sets that depend on the Applied Frequency-dependent perturbations may be used, e.g., Frequency-dependent London atomic orbitals. The 2n+1 rule may be Applied if computationally favorable, but alternative formulations using higher-order perturbed density matrices are also derived. These may be advantageous in order to minimize the number of response equations that needs to be solved, for instance, when one of the perturbations has many components, as is the case for the first-order geometrical derivative of the hyperpolarizability.
Jingquan Liu - One of the best experts on this subject based on the ideXlab platform.
-
a gullwing structured piezoelectric rotational energy harvester for low Frequency energy scavenging
Applied Physics Letters, 2019Co-Authors: Bin Yang, Gang Tang, Jingquan LiuAbstract:A gullwing-structural piezoelectric energy harvester mainly consisting of two typical nonlinear buckled-bridges is proposed to effectively scavenge low-Frequency rotational kinetic energy based on a gear mechanism induced interwell oscillation. A natural buckled piezoelectric unit and a flexible polymer substrate are used for the buckled-bridge. A thinned bulk lead zirconate titanate ceramic is employed for the piezoelectric layer in consideration of its excellent electromechanical factor. The presented harvester can generate a peak open-circuit voltage of 20 V at a rotational Frequency of 7.8 Hz, which has a low dependence on the Applied Frequency. A 100 μF capacitor reaches a charging voltage of 14.7 V after 38 s and is saturated at 16.05 V for 122 s. Through the power management circuit, the harvester generates an output power of 0.4 mW and the effective power density of 6.54 μW mm−3 at the low rotational Frequency. These results indicate that this strategy is promising for self-powered sensors, especially at changeable and low-Frequency ambient, such as tire pressure monitoring.
-
high performance bimorph piezoelectric mems harvester via bulk pzt thick films on thin beryllium bronze substrate
Applied Physics Letters, 2017Co-Authors: Bin Yang, Xiaolin Wang, Xiang Chen, Jingquan Liu, Chunsheng YangAbstract:This letter presents a high performance bimorph piezoelectric MEMS harvester with bulk PZT thick films on both sides of a flexible thin beryllium-bronze substrate via bonding and thinning technologies. The upper and lower PZT layers are thinned down to about 53 μm and 76 μm, respectively, and a commercial beryllium bronze with the thickness of about 50 μm is used as the substrate. The effective volume of this device is 30.6 mm3. The harvester with a tungsten proof mass generated the close-circuit peak-to-peak voltage of 53.1 V, the output power of 0.979 mW, and the power density of 31.99 mW/cm3 with the matching load resistance of 360 kΩ at the Applied acceleration amplitude of 3.5 g and the Applied Frequency of 77.2 Hz. Meanwhile, in order to evaluate the stability, the device was measured continuously under Applied acceleration amplitudes of 1.0 g and 3.5 g for one hour and demonstrated a good stability. Then, the harvester was utilized to light up LEDs and about twenty-one serial LEDs were lighted up a...
Xiang Chen - One of the best experts on this subject based on the ideXlab platform.
-
high performance bimorph piezoelectric mems harvester via bulk pzt thick films on thin beryllium bronze substrate
Applied Physics Letters, 2017Co-Authors: Zhiran Yi, Xiaolin Wang, Bin Yang, Guimiao Li, Xiang Chen, Chunsheng YangAbstract:This letter presents a high performance bimorph piezoelectric MEMS harvester with bulk PZT thick films on both sides of a flexible thin beryllium-bronze substrate via bonding and thinning technologies. The upper and lower PZT layers are thinned down to about 53 μm and 76 μm, respectively, and a commercial beryllium bronze with the thickness of about 50 μm is used as the substrate. The effective volume of this device is 30.6 mm3. The harvester with a tungsten proof mass generated the close-circuit peak-to-peak voltage of 53.1 V, the output power of 0.979 mW, and the power density of 31.99 mW/cm3 with the matching load resistance of 360 kΩ at the Applied acceleration amplitude of 3.5 g and the Applied Frequency of 77.2 Hz. Meanwhile, in order to evaluate the stability, the device was measured continuously under Applied acceleration amplitudes of 1.0 g and 3.5 g for one hour and demonstrated a good stability. Then, the harvester was utilized to light up LEDs and about twenty-one serial LEDs were lighted up a...
-
high performance bimorph piezoelectric mems harvester via bulk pzt thick films on thin beryllium bronze substrate
Applied Physics Letters, 2017Co-Authors: Bin Yang, Xiaolin Wang, Xiang Chen, Jingquan Liu, Chunsheng YangAbstract:This letter presents a high performance bimorph piezoelectric MEMS harvester with bulk PZT thick films on both sides of a flexible thin beryllium-bronze substrate via bonding and thinning technologies. The upper and lower PZT layers are thinned down to about 53 μm and 76 μm, respectively, and a commercial beryllium bronze with the thickness of about 50 μm is used as the substrate. The effective volume of this device is 30.6 mm3. The harvester with a tungsten proof mass generated the close-circuit peak-to-peak voltage of 53.1 V, the output power of 0.979 mW, and the power density of 31.99 mW/cm3 with the matching load resistance of 360 kΩ at the Applied acceleration amplitude of 3.5 g and the Applied Frequency of 77.2 Hz. Meanwhile, in order to evaluate the stability, the device was measured continuously under Applied acceleration amplitudes of 1.0 g and 3.5 g for one hour and demonstrated a good stability. Then, the harvester was utilized to light up LEDs and about twenty-one serial LEDs were lighted up a...