In a recently published paper Metal-Like Gravity (MLG) and Its Cosmological Applications [1] 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400310035003000360034003200330030000000 , it was ...In a recently published paper Metal-Like Gravity (MLG) and Its Cosmological Applications [1] 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400310035003000360034003200330030000000 , it was determined that a new modification of Newtonian gravity could explain many of the cosmological mysteries such as the nature of dark matter and dark energy. The theory provided a gravitational physical system and explained the flatness of the galactic rotational curves (RC). A RC fit that was identical to MOND’s RC fit for spiral galaxies was generated with α as a fitting parameter determined as equal to 1.345. In this paper I am elaborating more on the theory’s cosmological extrapolation of MOND’s critical acceleration a0. This is done by further assessing the gravitational interaction between the galactic baryonic mass and the halo-DM mass in the star-galaxy overlapping volume estimated in MLG framework interpreting a0 as only a factor induced from the reduction of the galactic luminous mass. It is asserted that MOND and MLG dynamic equations are equivalent with MOND’s form, only expressing the equation with an intermediate solution by equating the magnitudes of δ (a parameter that defines a scaled surface galactic DM-density perpendicular to the galactic radial direction in the galaxy-star halo overlapping volume) and G.展开更多
The realization of controllable polarity photoresponse within a single device is a crucial advancement for simulating biological bipolar vision cells to drive the development of next-generation optoelectronic technolo...The realization of controllable polarity photoresponse within a single device is a crucial advancement for simulating biological bipolar vision cells to drive the development of next-generation optoelectronic technologies.Nevertheless,current polarity photodetectors face significant challenges in fully suppressing symmetric photocurrent cancellation and optimizing carrier transport efficiency.Here,we propose a graphene-intercalated MoS_(2)/MoTe_(2)heterojunction,featuring a tailorable built-in electric field and a high efficiency transport channel.Spatially resolved photocurrent reveals that the controllable polarity photoresponse originates from the bias-dependent equivalent built-in electric field of MoS_(2)/MLG/MoTe_(2)heterojunction.The controllable polarity photoresponse realizes a large-area uniform“heart-shaped”photocurrent region.In enhanced polarity photoresponse mode,the photodetector exhibits broadband detection capabilities from visible(638 nm)to infrared(1550 nm)light,achieving a high responsivity of 18.1 A/W and an excellent detectivity of 2.8×10^(12)Jones,as well as fast response times of 94/119μs.Furthermore,precise imaging with a resolution better than 0.5 mm was successfully demonstrated,highlighting its polarity photoresponse for practical imaging applications.This work provides a new paradigm for controllable polarity photoresponse programmed by intercalated low-dimensional material structures,paving the way for next-generation intelligent sensing chips.展开更多
In order to improve the comprehensive properties of the Cu-11.9Al-2.5Mn shape memory alloy(SMA),multilayer graphene(MLG)carried by Cu_(51)Zr_(14)inoculant particles was incorporated and dispersed into this alloy throu...In order to improve the comprehensive properties of the Cu-11.9Al-2.5Mn shape memory alloy(SMA),multilayer graphene(MLG)carried by Cu_(51)Zr_(14)inoculant particles was incorporated and dispersed into this alloy through preparing the preform of the cold-pressed MLG-Cu_(51)Zr_(14)composite powders.In the resultant novel MLG/Cu-Al-Mn composites,MLG in fragmented or flocculent form has a good bonding with the Cu-Al-Mn matrix.MLG can prevent the coarsening of grains of the Cu-Al-Mn SMA and cause thermal mismatch dislocations near the MLG/Cu-Al-Mn interfaces.The damping and mechanical properties of the MLG/Cu-Al-Mn composites are significantly improved.When the content of MLG reaches 0.2 wt.%,the highest room temperature damping of 0.0558,tensile strength of 801.5 MPa,elongation of 10.8%,and hardness of HV 308 can be obtained.On the basis of in-depth observation of microstructures,combined with the theory of internal friction and strengthening and toughening theories of metals,the relevant mechanisms are discussed.展开更多
文摘In a recently published paper Metal-Like Gravity (MLG) and Its Cosmological Applications [1] 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003400310035003000360034003200330030000000 , it was determined that a new modification of Newtonian gravity could explain many of the cosmological mysteries such as the nature of dark matter and dark energy. The theory provided a gravitational physical system and explained the flatness of the galactic rotational curves (RC). A RC fit that was identical to MOND’s RC fit for spiral galaxies was generated with α as a fitting parameter determined as equal to 1.345. In this paper I am elaborating more on the theory’s cosmological extrapolation of MOND’s critical acceleration a0. This is done by further assessing the gravitational interaction between the galactic baryonic mass and the halo-DM mass in the star-galaxy overlapping volume estimated in MLG framework interpreting a0 as only a factor induced from the reduction of the galactic luminous mass. It is asserted that MOND and MLG dynamic equations are equivalent with MOND’s form, only expressing the equation with an intermediate solution by equating the magnitudes of δ (a parameter that defines a scaled surface galactic DM-density perpendicular to the galactic radial direction in the galaxy-star halo overlapping volume) and G.
基金supported by National Key R&D Program of China(No.2023YFA1608701)the National Natural Science Foundation of China(Nos.62274168,11933006,U2141240,and 62005249)+3 种基金Hangzhou Leading Innovation and Entrepreneurship Team(No.TD2020002)Open Fund of State Key Laboratory of Infrared Physics(SITP-NLIST-YB-2023-13)Natural Science Foundation of Zhejiang Province(Nos.LZ24F050006 and LQ20F050005)the Research Funds of Hangzhou Institute for Advanced Study,UCAS(Nos.B02006C019025 and B02006C021010).
文摘The realization of controllable polarity photoresponse within a single device is a crucial advancement for simulating biological bipolar vision cells to drive the development of next-generation optoelectronic technologies.Nevertheless,current polarity photodetectors face significant challenges in fully suppressing symmetric photocurrent cancellation and optimizing carrier transport efficiency.Here,we propose a graphene-intercalated MoS_(2)/MoTe_(2)heterojunction,featuring a tailorable built-in electric field and a high efficiency transport channel.Spatially resolved photocurrent reveals that the controllable polarity photoresponse originates from the bias-dependent equivalent built-in electric field of MoS_(2)/MLG/MoTe_(2)heterojunction.The controllable polarity photoresponse realizes a large-area uniform“heart-shaped”photocurrent region.In enhanced polarity photoresponse mode,the photodetector exhibits broadband detection capabilities from visible(638 nm)to infrared(1550 nm)light,achieving a high responsivity of 18.1 A/W and an excellent detectivity of 2.8×10^(12)Jones,as well as fast response times of 94/119μs.Furthermore,precise imaging with a resolution better than 0.5 mm was successfully demonstrated,highlighting its polarity photoresponse for practical imaging applications.This work provides a new paradigm for controllable polarity photoresponse programmed by intercalated low-dimensional material structures,paving the way for next-generation intelligent sensing chips.
基金supported by the Natural Science Foundation of Hebei Province,China(No.E2021202017)the National Natural Science Foundation of China(No.52061038)+3 种基金the Foundation Strengthening Program,China(No.2019-JCJQ-ZD-142-00)the Hebei Province Graduate Innovation Funding Project,China(No.CXZZBS2022032)the Jiangsu Provincial Policy Guidance Program(Special Project for the Introduction of Foreign Talents)Talent Introduction Program,China(No.BX2021024)the Science Plan Foundation of Tianjin Municipal Education Commission,China(No.2021KJ026)。
文摘In order to improve the comprehensive properties of the Cu-11.9Al-2.5Mn shape memory alloy(SMA),multilayer graphene(MLG)carried by Cu_(51)Zr_(14)inoculant particles was incorporated and dispersed into this alloy through preparing the preform of the cold-pressed MLG-Cu_(51)Zr_(14)composite powders.In the resultant novel MLG/Cu-Al-Mn composites,MLG in fragmented or flocculent form has a good bonding with the Cu-Al-Mn matrix.MLG can prevent the coarsening of grains of the Cu-Al-Mn SMA and cause thermal mismatch dislocations near the MLG/Cu-Al-Mn interfaces.The damping and mechanical properties of the MLG/Cu-Al-Mn composites are significantly improved.When the content of MLG reaches 0.2 wt.%,the highest room temperature damping of 0.0558,tensile strength of 801.5 MPa,elongation of 10.8%,and hardness of HV 308 can be obtained.On the basis of in-depth observation of microstructures,combined with the theory of internal friction and strengthening and toughening theories of metals,the relevant mechanisms are discussed.
