基于有限元法对比十字形调谐质量阻尼器(cross-type tuned mass damper,CTMD)、X形调谐质量阻尼器(X-type tuned mass damper,XTMD)及旋风形调谐质量阻尼器(tourbillion-type tuned mass damper,TTMD)在钢框架结构中的减震性能。建立钢...基于有限元法对比十字形调谐质量阻尼器(cross-type tuned mass damper,CTMD)、X形调谐质量阻尼器(X-type tuned mass damper,XTMD)及旋风形调谐质量阻尼器(tourbillion-type tuned mass damper,TTMD)在钢框架结构中的减震性能。建立钢框架结构模型,结合3种调谐质量阻尼器(tuned mass damper,TMD)构造形式,评估其在地震作用下的位移、加速度及弹簧出力特性。结果表明:3种TMD均能有效降低结构动力响应,其中TTMD综合性能最优,其Y向加速度减震率达97.09%,X向加速度减震率为72.4%,弹簧双向均衡出力对称性最优。展开更多
Toroidal torques,generated by the resonant magnetic perturbation(RMP)and acting on the plasma column,are numerically systematically investigated for an ITER baseline scenario.The neoclassical toroidal viscosity(NTV),i...Toroidal torques,generated by the resonant magnetic perturbation(RMP)and acting on the plasma column,are numerically systematically investigated for an ITER baseline scenario.The neoclassical toroidal viscosity(NTV),in particular the resonant portion,is found to provide the dominant contribution to the total toroidal torque under the slow plasma flow regime in ITER.While the electromagnetic torque always opposes the plasma flow,the toroidal torque associated with the Reynolds stress enhances the plasma flow independent of the flow direction.A peculiar double-peak structure for the net NTV torque is robustly computed for ITER,as the toroidal rotation frequency is scanned near the zero value.This structure is found to be ultimately due to a non-monotonic behavior of the wave-particle resonance integral(over the particle pitch angle)in the superbanana plateau NTV regime in ITER.These findings are qualitatively insensitive to variations of a range of factors including the wall resistivity,the plasma pedestal flow and the assumed frequency of the rotating RMP field.展开更多
Cholangiocarcinoma(CCA)is a rare type of cancer which arises from the bile duct epithelium and carries a poor prognosis.One of the main risk factors in the Western world is primary sclerosing cholangitis.Surgical rese...Cholangiocarcinoma(CCA)is a rare type of cancer which arises from the bile duct epithelium and carries a poor prognosis.One of the main risk factors in the Western world is primary sclerosing cholangitis.Surgical resection has traditionally been the only curative treatment but can only be offered to patients with early disease,excluding those with locally advanced disease.Despite initial poor outcomes,liver transplantation(LT)has evolved as a viable treatment for a select group of patients with CCAs that are deemed unresectable.This review aims to explore the evolution of the role of LT in patients with CCA.展开更多
The EHL-2 spherical torus at ENN is the next-generation experimental platform under conceptual design,aiming at realizing proton-boron(p-^(11)B)thermonuclear fusion,which is an attractive pathway towards neutron-free ...The EHL-2 spherical torus at ENN is the next-generation experimental platform under conceptual design,aiming at realizing proton-boron(p-^(11)B)thermonuclear fusion,which is an attractive pathway towards neutron-free fusion.To achieve high-performance steady-state plasma,it is extremely necessary to study the turbulence transport characteristics with high boron content in the plasma core.This study investigates the transport properties in the core internal transport barrier(ITB)region of p-^(11)B plasma utilizing the gyrokinetic code GENE in view of the high ion temperature scenario of EHL-2,specifically focusing on the impact of boron fractions and plasmaβon the microinstabilities and corresponding transport features.Numerical findings indicate that the inclusion of boron species effectively suppresses the trapped electron modes(TEMs)as well as promoting a transition from electromagnetic to electrostatic turbulence with increased boron fraction,which is a result of the suppression of microinstabilities by effective charge and mass.Moreover,it has been identified that the external E×B rotational shear has a notable inhibitory influence on transport,which can reduce the transport level by two to three orders of magnitude,especially at medium boron content.The suppressive effect of E×B on turbulence is weakened once the kinetic ballooning mode(KBM)is excited and the transport shows a rapid increase withβtogether with a reduction in zonal flow amplitude,which is consistent with previous findings.Therefore,it is strongly suggested that exploring advanced strategies for mitigating turbulent transport at highβregimes is necessary for the active control of plasma behavior regarding p-^(11)B plasma-based fusion devices such as EHL-2.展开更多
文摘基于有限元法对比十字形调谐质量阻尼器(cross-type tuned mass damper,CTMD)、X形调谐质量阻尼器(X-type tuned mass damper,XTMD)及旋风形调谐质量阻尼器(tourbillion-type tuned mass damper,TTMD)在钢框架结构中的减震性能。建立钢框架结构模型,结合3种调谐质量阻尼器(tuned mass damper,TMD)构造形式,评估其在地震作用下的位移、加速度及弹簧出力特性。结果表明:3种TMD均能有效降低结构动力响应,其中TTMD综合性能最优,其Y向加速度减震率达97.09%,X向加速度减震率为72.4%,弹簧双向均衡出力对称性最优。
基金funded by National Natural Science Foundation of China(NSFC)(Nos.12075053,11505021 and 11975068)by National Key R&D Program of China(No.2022YFE 03060002)+1 种基金by Fundamental Research Funds for the Central Universities(No.2232024G-10)supported by the U.S.DoE Office of Science(No.DE-FG02–95ER54309)。
文摘Toroidal torques,generated by the resonant magnetic perturbation(RMP)and acting on the plasma column,are numerically systematically investigated for an ITER baseline scenario.The neoclassical toroidal viscosity(NTV),in particular the resonant portion,is found to provide the dominant contribution to the total toroidal torque under the slow plasma flow regime in ITER.While the electromagnetic torque always opposes the plasma flow,the toroidal torque associated with the Reynolds stress enhances the plasma flow independent of the flow direction.A peculiar double-peak structure for the net NTV torque is robustly computed for ITER,as the toroidal rotation frequency is scanned near the zero value.This structure is found to be ultimately due to a non-monotonic behavior of the wave-particle resonance integral(over the particle pitch angle)in the superbanana plateau NTV regime in ITER.These findings are qualitatively insensitive to variations of a range of factors including the wall resistivity,the plasma pedestal flow and the assumed frequency of the rotating RMP field.
文摘Cholangiocarcinoma(CCA)is a rare type of cancer which arises from the bile duct epithelium and carries a poor prognosis.One of the main risk factors in the Western world is primary sclerosing cholangitis.Surgical resection has traditionally been the only curative treatment but can only be offered to patients with early disease,excluding those with locally advanced disease.Despite initial poor outcomes,liver transplantation(LT)has evolved as a viable treatment for a select group of patients with CCAs that are deemed unresectable.This review aims to explore the evolution of the role of LT in patients with CCA.
基金partly supported by SWIP project(No.SWIP-JYHT-12423).
文摘The EHL-2 spherical torus at ENN is the next-generation experimental platform under conceptual design,aiming at realizing proton-boron(p-^(11)B)thermonuclear fusion,which is an attractive pathway towards neutron-free fusion.To achieve high-performance steady-state plasma,it is extremely necessary to study the turbulence transport characteristics with high boron content in the plasma core.This study investigates the transport properties in the core internal transport barrier(ITB)region of p-^(11)B plasma utilizing the gyrokinetic code GENE in view of the high ion temperature scenario of EHL-2,specifically focusing on the impact of boron fractions and plasmaβon the microinstabilities and corresponding transport features.Numerical findings indicate that the inclusion of boron species effectively suppresses the trapped electron modes(TEMs)as well as promoting a transition from electromagnetic to electrostatic turbulence with increased boron fraction,which is a result of the suppression of microinstabilities by effective charge and mass.Moreover,it has been identified that the external E×B rotational shear has a notable inhibitory influence on transport,which can reduce the transport level by two to three orders of magnitude,especially at medium boron content.The suppressive effect of E×B on turbulence is weakened once the kinetic ballooning mode(KBM)is excited and the transport shows a rapid increase withβtogether with a reduction in zonal flow amplitude,which is consistent with previous findings.Therefore,it is strongly suggested that exploring advanced strategies for mitigating turbulent transport at highβregimes is necessary for the active control of plasma behavior regarding p-^(11)B plasma-based fusion devices such as EHL-2.
