Ferroelectric phase diagrams and the temperature dependence of polarization,dielectric properties of the three pseudo-spin in ferroelectric or ferro-antiferroelectric systemdescribed by a transverse Ising models are i...Ferroelectric phase diagrams and the temperature dependence of polarization,dielectric properties of the three pseudo-spin in ferroelectric or ferro-antiferroelectric systemdescribed by a transverse Ising models are investigated on the basis of the effective-Geld theorywith the differential operator technique. The effects of the transverse field and the couplingstrength between the nearest-neighboring pseudo-spin on the physical properties are discussed indetail.展开更多
0.5μm-gate-length lateral double-diffused metal-oxide-semiconductor field-effect transistors （LDMOSFETs） with low barrier body contact （LBBC） and body tied to the source （BTS） were fabricated on silicon-on-insu...0.5μm-gate-length lateral double-diffused metal-oxide-semiconductor field-effect transistors （LDMOSFETs） with low barrier body contact （LBBC） and body tied to the source （BTS） were fabricated on silicon-on-insulator （SOI） substrates. The back-gate effects on front-channel subthreshold characteristics, on-resistance, and off-state breakdown characteristics of these devices are studied in detail. The LDMOSFETs with the LBBC structure show less back-gate effect than those with the BTS structure due to better control of the floating body effect and suppression of the parasitic backchannel leakage current. A model for the SOl LDMOSFETs has been given,including the front- and back-channel conductions as well as the bias-dependent series resistance.展开更多
Beam model has been used widely in computer aided engineering for mechanical systems and the simulation results largely depend on the beam model, there are great demand for beam model with high accuracy and efficiency...Beam model has been used widely in computer aided engineering for mechanical systems and the simulation results largely depend on the beam model, there are great demand for beam model with high accuracy and efficiency in simulating the mechanical system with large deformation. In this work, a new model of Timoshenko beam for large deformations is proposed to improve the accuracy and efficiency. Absolute nodal coordinate formulation and geometrically-exact beam formulation, which make the model very suitable to simulate large deformation mechanical system, are first combined in the new beam model, the governing equations are then discrete by finite element methods and numerical difficulties are well solved by applying the shape function strategy. The new beam model is then applied to simulate the mechanical systems with large deformation and the simulations based on the traditional beam model and hexahedron element were also carried out to verify the results. The results show that good precision and efficiency in simulating the mechanical systems with large deformation can be obtained by the new Timoshenko beam model at the same time. The presented new method also serves as a good foundation for other simulation of mechanical systems.展开更多
基金辽宁省自然科学基金，the Hong Kong Polytechnic University through the University Research Grant
文摘Ferroelectric phase diagrams and the temperature dependence of polarization,dielectric properties of the three pseudo-spin in ferroelectric or ferro-antiferroelectric systemdescribed by a transverse Ising models are investigated on the basis of the effective-Geld theorywith the differential operator technique. The effects of the transverse field and the couplingstrength between the nearest-neighboring pseudo-spin on the physical properties are discussed indetail.
基金the National Natural Science Foundation of China(No.60576051)the State Key Development Program for Basic Research of China(No.2006CB3027-01)~~
文摘0.5μm-gate-length lateral double-diffused metal-oxide-semiconductor field-effect transistors （LDMOSFETs） with low barrier body contact （LBBC） and body tied to the source （BTS） were fabricated on silicon-on-insulator （SOI） substrates. The back-gate effects on front-channel subthreshold characteristics, on-resistance, and off-state breakdown characteristics of these devices are studied in detail. The LDMOSFETs with the LBBC structure show less back-gate effect than those with the BTS structure due to better control of the floating body effect and suppression of the parasitic backchannel leakage current. A model for the SOl LDMOSFETs has been given,including the front- and back-channel conductions as well as the bias-dependent series resistance.
基金supported by the National Natural Science Foundation of China(Grant Nos.51605219&51375007)the Natural Science Foundation of Jiangsu Province(Grant Nos.BK20160791&SBK2015022352)+3 种基金the Visiting Scholar Foundation of the State Key Lab of Mechanical Transmission in Chongqing University(Grant Nos.SKLMT-KFKT-2014010&SKLMT-KFKT-201507)the start-up research foundation for new teachers in Nanjing University of Aeronautics and Astronautics(Grant No.1002-YAH16027)the Fundamental Research Funds for the Central Universities(Grant No.NE2016002)the Open Fund Program of the State Key Laboratory of Vehicle Lightweight Design,P.R.China(Grant No.20130303)
文摘Beam model has been used widely in computer aided engineering for mechanical systems and the simulation results largely depend on the beam model, there are great demand for beam model with high accuracy and efficiency in simulating the mechanical system with large deformation. In this work, a new model of Timoshenko beam for large deformations is proposed to improve the accuracy and efficiency. Absolute nodal coordinate formulation and geometrically-exact beam formulation, which make the model very suitable to simulate large deformation mechanical system, are first combined in the new beam model, the governing equations are then discrete by finite element methods and numerical difficulties are well solved by applying the shape function strategy. The new beam model is then applied to simulate the mechanical systems with large deformation and the simulations based on the traditional beam model and hexahedron element were also carried out to verify the results. The results show that good precision and efficiency in simulating the mechanical systems with large deformation can be obtained by the new Timoshenko beam model at the same time. The presented new method also serves as a good foundation for other simulation of mechanical systems.
