A novel hollow optimized simple cubic(SC)lattice structure based on the triply periodic minimal surface(TPMS)geometry was proposed,inspired by bamboo geometry,aiming at enhancing both load bearing and energy absorptio...A novel hollow optimized simple cubic(SC)lattice structure based on the triply periodic minimal surface(TPMS)geometry was proposed,inspired by bamboo geometry,aiming at enhancing both load bearing and energy absorption properties.Conventional SC lattice structures,despite their high load bearing capability and ease of fabrication,suffer from poor energy absorption performance due to their high stress concentration at the nodes and the induced deformation instability under compressive loads.By integrating the hollow and tapered features of TPMS geometry into the SC lattice,the proposed structure design effectively mitigates these issues,improving energy absorption simultaneously.The effectiveness of this design is demonstrated by finite element(FE)simulations and experimental tests,showcasing significant improvements in energy absorption capacity and strength,particularly after properly adjusting the shape parameters(e.g.,C=0.6).This research provides a promising pathway for developing lightweight,high-performance lattice structures for engineering applications with complex and volatile loading conditions.展开更多
We present weakly interacting massive particles(WIMPs) search results performed using two approaches of effective field theory from the China Dark Matter Experiment(CDEX), based on the data from both CDEX-1B and CDEX-...We present weakly interacting massive particles(WIMPs) search results performed using two approaches of effective field theory from the China Dark Matter Experiment(CDEX), based on the data from both CDEX-1B and CDEX-10 stages. In the nonrelativistic effective field theory approach, both time-integrated and annual modulation analyses were used to set new limits for the coupling of WIMP-nucleon effective operators at 90% confidence level(C.L.) and improve over the current bounds in the low mχregion. In the chiral effective field theory approach, data from CDEX-10 were used to set an upper limit on WIMP-pion coupling at 90% C.L. We for the first time extended the limit to the m_(χ)<6 GeV/c^(2) region.展开更多
We operated a p-type point contact high purity germanium(PPCGe)detector(CDEX-1B,1.008 kg)in the China Jinping Underground Laboratory(CJPL)for 500.3 days to search for neutrinoless double beta(0νββ)decay of ^(76)Ge....We operated a p-type point contact high purity germanium(PPCGe)detector(CDEX-1B,1.008 kg)in the China Jinping Underground Laboratory(CJPL)for 500.3 days to search for neutrinoless double beta(0νββ)decay of ^(76)Ge.A total of 504.3 kg⋅day effective exposure data was accumulated.The anti-coincidence and the multi/single-site event(MSE/SSE)discrimination methods were used to suppress the background in the energy region of interest(ROI,1989–2089 keV for this work)with a factor of 23.A background level of 0.33 counts/(keV⋅kg⋅yr)was realized.The lower limit on the half life of^(76)Ge 0νββdecay was constrained as T_(1/2)^(0ν)>1.0×10^(23)yr(90%C.L.),corresponding to the upper limits on the effective Majorana neutrino mass:<mββ><3.2–7.5 eV.展开更多
基金support from the National Natural Science Foundation of China(12472077)the National Key Laboratory of Science and Technology on Materials under Shock and Impact(WDZC2023-5)+1 种基金the State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment(GZ23107)the Shanghai Gaofeng Project for University Academic Program Development,and the Shanghai Supercomputer Center.
文摘A novel hollow optimized simple cubic(SC)lattice structure based on the triply periodic minimal surface(TPMS)geometry was proposed,inspired by bamboo geometry,aiming at enhancing both load bearing and energy absorption properties.Conventional SC lattice structures,despite their high load bearing capability and ease of fabrication,suffer from poor energy absorption performance due to their high stress concentration at the nodes and the induced deformation instability under compressive loads.By integrating the hollow and tapered features of TPMS geometry into the SC lattice,the proposed structure design effectively mitigates these issues,improving energy absorption simultaneously.The effectiveness of this design is demonstrated by finite element(FE)simulations and experimental tests,showcasing significant improvements in energy absorption capacity and strength,particularly after properly adjusting the shape parameters(e.g.,C=0.6).This research provides a promising pathway for developing lightweight,high-performance lattice structures for engineering applications with complex and volatile loading conditions.
基金supported by the National Key Research and Development Program of China(Grant No.2017YFA0402200)the National Natural Science Foundation of China(Grant Nos.11725522,11675088,11475099U1865205)。
文摘We present weakly interacting massive particles(WIMPs) search results performed using two approaches of effective field theory from the China Dark Matter Experiment(CDEX), based on the data from both CDEX-1B and CDEX-10 stages. In the nonrelativistic effective field theory approach, both time-integrated and annual modulation analyses were used to set new limits for the coupling of WIMP-nucleon effective operators at 90% confidence level(C.L.) and improve over the current bounds in the low mχregion. In the chiral effective field theory approach, data from CDEX-10 were used to set an upper limit on WIMP-pion coupling at 90% C.L. We for the first time extended the limit to the m_(χ)<6 GeV/c^(2) region.
基金Supported by the National Key Research and Development Program of China(2017YFA0402201,2022YFA1604701,2022YFA1605000)the National Natural Science Foundation of China(12322511,12175112,12005111,11725522)。
文摘We operated a p-type point contact high purity germanium(PPCGe)detector(CDEX-1B,1.008 kg)in the China Jinping Underground Laboratory(CJPL)for 500.3 days to search for neutrinoless double beta(0νββ)decay of ^(76)Ge.A total of 504.3 kg⋅day effective exposure data was accumulated.The anti-coincidence and the multi/single-site event(MSE/SSE)discrimination methods were used to suppress the background in the energy region of interest(ROI,1989–2089 keV for this work)with a factor of 23.A background level of 0.33 counts/(keV⋅kg⋅yr)was realized.The lower limit on the half life of^(76)Ge 0νββdecay was constrained as T_(1/2)^(0ν)>1.0×10^(23)yr(90%C.L.),corresponding to the upper limits on the effective Majorana neutrino mass:<mββ><3.2–7.5 eV.
