Quantum algorithms offer more enhanced computational efficiency in comparison to their classical counterparts when solving specific tasks.In this study,we implement the quantum permutation algorithm utilizing a polar ...Quantum algorithms offer more enhanced computational efficiency in comparison to their classical counterparts when solving specific tasks.In this study,we implement the quantum permutation algorithm utilizing a polar molecule within an external electric field.The selection of the molecular qutrit involves the utilization of field-dressed states generated through the pendular modes of SrO.Through the application of multi-target optimal control theory,we strategically design microwave pulses to execute logical operations,including Fourier transform,oracle U_(f)operation,and inverse Fourier transform within a three-level molecular qutrit structure.The observed high fidelity of our outcomes is intricately linked to the concept of the quantum speed limit,which quantifies the maximum speed of quantum state manipulation.Subsequently,we design the optimized pulse sequence to successfully simulate the quantum permutation algorithm on a single SrO molecule,achieving remarkable fidelity.Consequently,a quantum circuit comprising a single qutrit suffices to determine permutation parity with just a single function evaluation.Therefore,our results indicate that the optimal control theory can be well applied to the quantum computation of polar molecular systems.展开更多
AIM:To evaluate the outcome and the degree of patient satisfaction with the reconstruction of full-thickness medial and central lower lid defects using a pendular flap of the remaining lateral part of the lower lid.ME...AIM:To evaluate the outcome and the degree of patient satisfaction with the reconstruction of full-thickness medial and central lower lid defects using a pendular flap of the remaining lateral part of the lower lid.METHODS:Totally 20 patients with full thickness medial or central lower lid defects that could not be repaired by direct closure with or without cantholysis.A sliding full-thickness composite flap was created from the lateral part of the remaining lid to cover the defect.The posterior lamella of the induced lateral defect was repaired by either a periosteal flap alone or in combination with a free tarsal graft.Postoperative cosmetic and functional outcomes were evaluated.RESULTS:The mean age of the patients was 46.3±18.1y(20-70y).The defects ranged from 30%-80%of the lid width and resulted from the excision of lid tumors in 11 patients(55%)and from trauma in 9(45%)patients.Postoperative complications included one case of lateral graft ectropion,2 cases of lid retraction and 3 cases of marginal graft necrosis.Most of the patients had an acceptable final cosmetic outcome.CONCLUSION:Reconstruction of moderate-sized defects in the medial/central lower lid via a sliding flap yielded acceptable cosmetic and functional outcomes with high patient satisfaction.Large defects≥50%of the horizontal length are at greater risk of complications.Reconstruction of medial defects by this technique was associated with a greater incidence of complications.展开更多
This paper aims at establishing an anisotropic stress expression for unsaturated pendular-state granular soils. Using the second-order fabric tensor, we formulate a micromechanics scheme of soils with statistically av...This paper aims at establishing an anisotropic stress expression for unsaturated pendular-state granular soils. Using the second-order fabric tensor, we formulate a micromechanics scheme of soils with statistically averaging method, and reveal that the macroscopic average stress of unsaturated granular soils in pendular-state is not isotropic. Not only is the stress from contact forces anisotropic due to the fabric, but also the capillary stress is directional dependent, which is different from the common point that the capillary stress is isotropic. The capillary stress of unsaturated pendular-state granular soils is determined by the orientation distribution of con- tact normals, so it is closely related to the initial and induced anisotropy of soils. Finally, DEM numerical simulations of triaxial compression tests of pendular-state soils at different degrees of saturation are used to verify the existence of above anisotropy of stresses.展开更多
研究了被动调谐质量阻尼器(Tuned Mass Damper,TMD)在一种新的安装方式下对悬吊结构平面摆振的控制效果,并考虑悬吊结构质量分布对TMD系统调频的影响。首先基于拉格朗日原理建立了附加双TMD体系双质点悬吊结构的无阻尼自由振动方程,并...研究了被动调谐质量阻尼器(Tuned Mass Damper,TMD)在一种新的安装方式下对悬吊结构平面摆振的控制效果,并考虑悬吊结构质量分布对TMD系统调频的影响。首先基于拉格朗日原理建立了附加双TMD体系双质点悬吊结构的无阻尼自由振动方程,并对质量分布对双质点悬吊结构周期的影响进行了理论分析;然后定义了TMD控制无阻尼自由振动的控制效果评价指标,利用Simulink对运动方程进行数值求解,证明此时TMD对悬吊结构具有一定的控制效果,并对质量分布在TMD调频、质量比与板长摆长比变化情况下对控制效果的影响进行了数值分析,发现控制效果随着双质点的分散而下降的规律,而这种规律与质量比和板长摆长比的变化无关,验证了理论分析中对质点分布影响的推断,并得出TMD应根据悬吊结构质量分布的影响来调频以保证控制效果的结论。展开更多
基金supported by the National Natural Science Foundation of China under Grant Nos.92265209,11174081 and 62305285the Natural Science Foundation of Chongqing under Grant No.CSTB2024NSCQ-MSX0643the Shanghai Municipal Science and Technology Major Project under Grant No.2019SHZDZX01。
文摘Quantum algorithms offer more enhanced computational efficiency in comparison to their classical counterparts when solving specific tasks.In this study,we implement the quantum permutation algorithm utilizing a polar molecule within an external electric field.The selection of the molecular qutrit involves the utilization of field-dressed states generated through the pendular modes of SrO.Through the application of multi-target optimal control theory,we strategically design microwave pulses to execute logical operations,including Fourier transform,oracle U_(f)operation,and inverse Fourier transform within a three-level molecular qutrit structure.The observed high fidelity of our outcomes is intricately linked to the concept of the quantum speed limit,which quantifies the maximum speed of quantum state manipulation.Subsequently,we design the optimized pulse sequence to successfully simulate the quantum permutation algorithm on a single SrO molecule,achieving remarkable fidelity.Consequently,a quantum circuit comprising a single qutrit suffices to determine permutation parity with just a single function evaluation.Therefore,our results indicate that the optimal control theory can be well applied to the quantum computation of polar molecular systems.
文摘AIM:To evaluate the outcome and the degree of patient satisfaction with the reconstruction of full-thickness medial and central lower lid defects using a pendular flap of the remaining lateral part of the lower lid.METHODS:Totally 20 patients with full thickness medial or central lower lid defects that could not be repaired by direct closure with or without cantholysis.A sliding full-thickness composite flap was created from the lateral part of the remaining lid to cover the defect.The posterior lamella of the induced lateral defect was repaired by either a periosteal flap alone or in combination with a free tarsal graft.Postoperative cosmetic and functional outcomes were evaluated.RESULTS:The mean age of the patients was 46.3±18.1y(20-70y).The defects ranged from 30%-80%of the lid width and resulted from the excision of lid tumors in 11 patients(55%)and from trauma in 9(45%)patients.Postoperative complications included one case of lateral graft ectropion,2 cases of lid retraction and 3 cases of marginal graft necrosis.Most of the patients had an acceptable final cosmetic outcome.CONCLUSION:Reconstruction of moderate-sized defects in the medial/central lower lid via a sliding flap yielded acceptable cosmetic and functional outcomes with high patient satisfaction.Large defects≥50%of the horizontal length are at greater risk of complications.Reconstruction of medial defects by this technique was associated with a greater incidence of complications.
基金Project supported by the National Natural Science Foundation of China (No. 50778013)the National Basic Research Program (973) of China (No. 2010CB732100)
文摘This paper aims at establishing an anisotropic stress expression for unsaturated pendular-state granular soils. Using the second-order fabric tensor, we formulate a micromechanics scheme of soils with statistically averaging method, and reveal that the macroscopic average stress of unsaturated granular soils in pendular-state is not isotropic. Not only is the stress from contact forces anisotropic due to the fabric, but also the capillary stress is directional dependent, which is different from the common point that the capillary stress is isotropic. The capillary stress of unsaturated pendular-state granular soils is determined by the orientation distribution of con- tact normals, so it is closely related to the initial and induced anisotropy of soils. Finally, DEM numerical simulations of triaxial compression tests of pendular-state soils at different degrees of saturation are used to verify the existence of above anisotropy of stresses.
文摘研究了被动调谐质量阻尼器(Tuned Mass Damper,TMD)在一种新的安装方式下对悬吊结构平面摆振的控制效果,并考虑悬吊结构质量分布对TMD系统调频的影响。首先基于拉格朗日原理建立了附加双TMD体系双质点悬吊结构的无阻尼自由振动方程,并对质量分布对双质点悬吊结构周期的影响进行了理论分析;然后定义了TMD控制无阻尼自由振动的控制效果评价指标,利用Simulink对运动方程进行数值求解,证明此时TMD对悬吊结构具有一定的控制效果,并对质量分布在TMD调频、质量比与板长摆长比变化情况下对控制效果的影响进行了数值分析,发现控制效果随着双质点的分散而下降的规律,而这种规律与质量比和板长摆长比的变化无关,验证了理论分析中对质点分布影响的推断,并得出TMD应根据悬吊结构质量分布的影响来调频以保证控制效果的结论。
