We obtain the multisolitary solutions of the extended Bose-Hubbard model which describes dipolar Bose- Einstein condensates in optical lattices under time-dependent magnetic fields, and indicate that the nonlinearity ...We obtain the multisolitary solutions of the extended Bose-Hubbard model which describes dipolar Bose- Einstein condensates in optical lattices under time-dependent magnetic fields, and indicate that the nonlinearity is due to both on-site short-range interactions and also （long-range） dipole-dipole interactions which can act between neighboring sites. The discrete breathers as nonlinear excitations are always oscillatory in time and can also be spatially localized, while the oscillatory frequencies are determined by an external field. We show that these excitations will be observable and discuss how the parameters can be tuned in future experiments.展开更多
Wearable and stretchable physical sensors that can conformally contact on the surface of organs or skin provide a new opportunity for human-activity monitoring and personal healthcare. Particularly, various attempts h...Wearable and stretchable physical sensors that can conformally contact on the surface of organs or skin provide a new opportunity for human-activity monitoring and personal healthcare. Particularly, various attempts have been made in exploiting wearable and conformal sensors for ther- mal characterization of human skin. In this respect, skin- mounted thermochromic films show great capabilities in body temperature sensing. Thermochromic temperature sensors are attractive because of their easy signal analysis and optical recording, such as color transition and fluorescence emission change upon thermal stimuli. Here, desirable mechanical properties that match epidermis are obtained by physical crosslinking of polydiacetylene （PDA） and transparent elas- tomeric polydimethylsiloxane （PDMS） networks. The result- ing PDA fdm displayed thermochromic and thermo- fluorescent transition temperature in the range of 25-85℃, with stretchability up to 300% and a skin-like Young＇s mod- ulus of -230 kPa. This easy signal-handling provides excellent references for further design of convenient noninvasive sen- sing systems.展开更多
文摘We obtain the multisolitary solutions of the extended Bose-Hubbard model which describes dipolar Bose- Einstein condensates in optical lattices under time-dependent magnetic fields, and indicate that the nonlinearity is due to both on-site short-range interactions and also （long-range） dipole-dipole interactions which can act between neighboring sites. The discrete breathers as nonlinear excitations are always oscillatory in time and can also be spatially localized, while the oscillatory frequencies are determined by an external field. We show that these excitations will be observable and discuss how the parameters can be tuned in future experiments.
基金supported by the National Key Research and Development Program of China (2016YFB0700300)the National Natural Science Foundation of China (51503014 and51501008)the State Key Laboratory for Advanced Metals and Materials (2016Z-03)
文摘Wearable and stretchable physical sensors that can conformally contact on the surface of organs or skin provide a new opportunity for human-activity monitoring and personal healthcare. Particularly, various attempts have been made in exploiting wearable and conformal sensors for ther- mal characterization of human skin. In this respect, skin- mounted thermochromic films show great capabilities in body temperature sensing. Thermochromic temperature sensors are attractive because of their easy signal analysis and optical recording, such as color transition and fluorescence emission change upon thermal stimuli. Here, desirable mechanical properties that match epidermis are obtained by physical crosslinking of polydiacetylene （PDA） and transparent elas- tomeric polydimethylsiloxane （PDMS） networks. The result- ing PDA fdm displayed thermochromic and thermo- fluorescent transition temperature in the range of 25-85℃, with stretchability up to 300% and a skin-like Young＇s mod- ulus of -230 kPa. This easy signal-handling provides excellent references for further design of convenient noninvasive sen- sing systems.
