The development of digital intelligent diagnostic and treatment technology has opened countless new opportunities for liver surgery from the era of digital anatomy to a new era of digital diagnostics,virtual surgery s...The development of digital intelligent diagnostic and treatment technology has opened countless new opportunities for liver surgery from the era of digital anatomy to a new era of digital diagnostics,virtual surgery simulation and using the created scenarios in real-time surgery using mixed reality.In this article,we described our experience on developing a dedicated 3 dimensional visualization and reconstruction software for surgeons to be used in advanced liver surgery and living donor liver transplantation.Furthermore,we shared the recent developments in the field by explaining the outreach of the software from virtual reality to augmented reality and mixed reality.展开更多
Purpose: To clarify the effectiveness of 3-D delivery animation software for the mother’s and husband’s satisfaction with delivery. Subjects and Method: We independently developed a software application used to disp...Purpose: To clarify the effectiveness of 3-D delivery animation software for the mother’s and husband’s satisfaction with delivery. Subjects and Method: We independently developed a software application used to display the pelvic region and explain the labor process. The study involved a collaboration with hospital staff who recruited 18 primiparous and 18 multiparous mothers who were hospitalized for delivery at Facility A. The midwife explained the process of delivery using the “Delivery Animation Software”. A self-administered, anonymous questionnaire was distributed and analyzed separately for primiparous and multiparous mothers and their husbands. Results: 1) For both primiparous and multiparous couples, both mothers and their husbands gained a significantly higher level of understanding after delivery than during pregnancy. 2) The Self-Evaluation Scale for Experience of Delivery results were as follows: “I did my best for the baby even if it was painful” was selected more often for “birth coping skills”;“reliable medical staff” was selected more often for “physiological birth process”;“the birth progressed as I expected” was selected frequently by primiparous mothers;and “the birth progressed smoothly” was selected often by multiparous mothers. 3) In terms of husbands’ satisfaction with the delivery, “I was satisfied with the delivery”, “I was given an easy-to-understand explanation”, and “They explained the process to me” was selected of primiparous and multiparous fathers. 4) All primiparous and multiparous mothers positively evaluated whether the delivery animation was helpful in understanding the process of delivery. Conclusion: The delivery animation was effective in improving the understanding and satisfaction of both the mothers and their husbands.展开更多
We study the stability and dynamic behaviors of skyrmions in magnetic nanotubes,where curvature and cylindrical symmetry provide unique mechanisms for skyrmion formation and control.Unlike planar geometries,skyrmions ...We study the stability and dynamic behaviors of skyrmions in magnetic nanotubes,where curvature and cylindrical symmetry provide unique mechanisms for skyrmion formation and control.Unlike planar geometries,skyrmions confined in nanotubes exhibit elliptical shapes,stabilized through the interplay of curvature-induced effects,Dzyaloshinskii-Moriya interaction(DMI),and magnetic anisotropy.Using micromagnetic simulations,we construct phase diagrams of skyrmion stability as functions of DMI strength and anisotropy,identifying transitions to saturated or helical configurations in unstable regimes.The dynamics reveal distinct counterclockwise gyration modes,strongly influenced by tube geometry and applied microwave fields.We find that external magnetic fields significantly enhance the azimuthal velocity(v_(φ))while maintaining a consistent axial motion(v_(z))along the-z-direction.Furthermore,transitions between gyration and linear translation modes emerge,governed by the combined effects of magnetic field,DMI,and curvature.Notably,the skyrmion's motion direction depends on the excitation mode and DMI sign,while curvature-modified spin textures produce effective fields without conventional pinning.These results demonstrate that magnetic nanotubes offer a robust and tunable platform for skyrmion manipulation,with potential applications in next-generation memory and logic devices.Our findings also highlight the role of curvature in enabling stable and controllable topological spin textures for advanced spintronic technologies.展开更多
Understanding skyrmion–skyrmion interactions and their dynamical effects is crucial for skyrmion-based applications.In this article,we investigate the deformation of skyrmions induced by the inter-skyrmion interactio...Understanding skyrmion–skyrmion interactions and their dynamical effects is crucial for skyrmion-based applications.In this article,we investigate the deformation of skyrmions induced by the inter-skyrmion interaction in both static and dynamic scenarios for a two-skyrmion system.In the static case under a pinning magnetic field,the inter-skyrmion interaction energy decreases rapidly with increasing separation between the skyrmions,while their individual sizes grow.The semiaxis ratio of the elliptical skyrmion exhibits non-monotonic behavior,owing to the competition between skyrmion–skyrmion interactions and pinning effects.In dynamic simulations after removing the external pinning field,the two skyrmions spiral away from each other with increasing separation.Following a rapid relaxation period after magnetic field withdrawal,their semiaxis ratio typically increases with distance and the skyrmions gradually approach a perfect circular shape.These findings provide valuable insights into the behavior and interactions of two-skyrmion systems.展开更多
We investigate the skyrmion motion driven by spin waves on magnetic nanotubes through micromagnetic simulations.Our key results include demonstrating the stability and enhanced mobility of skyrmions on the edgeless na...We investigate the skyrmion motion driven by spin waves on magnetic nanotubes through micromagnetic simulations.Our key results include demonstrating the stability and enhanced mobility of skyrmions on the edgeless nanotube geometry,which prevents destruction at boundaries—a common issue in planar geometries.We explore the influence of the damping coefficient,amplitude,and frequency of microwaves on skyrmion dynamics,revealing a non-uniform velocity profile characterized by acceleration and deceleration phases.Our results show that the skyrmion Hall effect is significantly modulated on nanotubes compared to planar models,with specific dependencies on the spin-wave parameters.These findings provide insights into skyrmion manipulation for spintronic applications,highlighting the potential for high-speed and efficient information transport in magnonic devices.展开更多
Within the magnonics community,there has been a lot of interests in the magnon–skyrmion interaction.Magnons and skyrmions are two intriguing phenomena in condensed matter physics,and magnetic nanotubes have emerged a...Within the magnonics community,there has been a lot of interests in the magnon–skyrmion interaction.Magnons and skyrmions are two intriguing phenomena in condensed matter physics,and magnetic nanotubes have emerged as a suitable platform to study their complex interactions.We show that magnon frequency combs can be induced in magnetic nanotubes by three-wave mixing between the propagating magnons and skyrmion.This study enriches our fundamental comprehension of magnon–skyrmion interactions and holds promise for developing innovative spintronic devices and applications.This frequency comb tunability and unique spectral features offer a rich platform for exploring novel avenues in magnetic nanotechnology.展开更多
Rolling force and temperature field are important parameters in the hot rolling process of plate steel.Most researchers use ANSYS/LS-DYNA and MSC.Marc to simulate the hot rolling process,however,software DEFORM-3D is ...Rolling force and temperature field are important parameters in the hot rolling process of plate steel.Most researchers use ANSYS/LS-DYNA and MSC.Marc to simulate the hot rolling process,however,software DEFORM-3D is not used widely in this field.Therefore,in this study,the commercially available finite element analysis software DEFORM-3D is used to simulate the distribution of rolling force,stress-effective,strain-effective and temperature field during the hot rolling process of plate steel with the size of 0.220 m×2.070 m×1.904 m.Both the simulated rolling force and temperature of the multi-pass are compared with the measured results.It is shown that the simulated values by the finite element method are approximate to the measured values in the hot rolling of plate steel.So the simulation can provide an important reference and optimization to make rolling process and parameters in steel factory.展开更多
Extraction of a protective coal seam (PVCS)-below or above a coal seam to be mined with the potential of coal andgas outburst risk-plays an important role not only in decreasing the stress field in the surrounding roc...Extraction of a protective coal seam (PVCS)-below or above a coal seam to be mined with the potential of coal andgas outburst risk-plays an important role not only in decreasing the stress field in the surrounding rock mass but alsoin increasing the gas desorption capacity and gas flow permeability in the protected coal seam (PTCS). The PVCSis mined to guarantee the safe mining of the PTCS. This study has numerically evaluated the stress redistributioneffects using FLAC3D model for a longwall face in Shanxi Province. The effects of mining depth, mining height andinter-burden rock mass properties were evaluated using the stress relief angle and stress relief coefficient. Verticalstress distribution, stress relief angle and stress relief coefficient in the PTCS were analyzed as the face advancedin the PVCS. The results showed that the stress relief achieved in different locations of the PTCS varied as the faceadvanced. Sensitivity analyses on the pertinent variables indicate that the stress relief in the PTCS is affected mostby the mining depth followed by the inter-burden lithology and the mining height. Furthermore, the elastic moduliof different layers within the inter-burden rock mass are more important than their uniaxial compressive strength(UCS) and Poisson’s ratio. These observations can guide gas drainage borehole design to minimize the accidentsof coal and gas outbursts.展开更多
Slope stability is one of the most important subjects of geotechnics. The slope top-loading plays a key role in the stability of slopes in hill slope areas. When the building load is too large or the point of action f...Slope stability is one of the most important subjects of geotechnics. The slope top-loading plays a key role in the stability of slopes in hill slope areas. When the building load is too large or the point of action from the shoulder is too close, the shear stress of the slope will be significantly greater than its shear strength, resulting in reduced slope stability. Therefore, it is of great importance to study the relationship between the building load and the stability of the slope. This study aims to analyze the influence of different building loads applied at different distances on the top of the slope and deduces their effects on the slope stability. For this purpose, a three-dimensional slope model under different building loads with different distances to the slope shoulder was established using the finite-difference analysis software Flac3D. The results show that the loads applied at different distances on the top of the slope have different effects on the slope stability. The slope factor of safety (FOS) increases with the increase of the distance between the top-loading and the slope shoulder;it varies from 1.37 to 1.53 for the load P = 120 KPa, 1.27 to 1.53 for the load P = 200 KPa, and from 1.18 to 1.44 for P = 300 KPa, resulting in the decrease of the coincidence area between the load-deformation and the potential sliding surface. The slope is no longer affected by the potential risk of sliding at approximately 20 m away from the slope shoulder.展开更多
Objective This study aimed to investigate the dose calculation accuracy of individualized bulk electron density(IBED)assignment approaches for simulated magnetic resonance imaging(MRI)-only planning of thoracic tumors...Objective This study aimed to investigate the dose calculation accuracy of individualized bulk electron density(IBED)assignment approaches for simulated magnetic resonance imaging(MRI)-only planning of thoracic tumors via the use of a 3 DVH system.Methods 8 patients with thoracic cancer were included in this study.Based on standard planning CT,single-arc dynamic conformal therapy(DCT)and double-arc volumetric modulated arc therapy(VMAT)plans with a6 MV photon beam were generated as a baseline plan(Plan-CT)for each patient.The simulated MRI-only planning(Plan-IBED)was implemented by copying the Plan-CT and forcing the electron density of each region of interest to its average value and recalculating the dose distribution.A 3 DVH system was used to visualize and compare the dosimetric differences between Plan-CT and Plan-IBED,and the criteria of the 3 D-Gamma pass rate were set to 1.0%/1.0 mm.Results The maximum percentage relative deviation(MPRD)of the dosimetric parameters D2,D95,D98,and Dmean of planning tumor volumes(PTVs)between Plan-CT and Plan-IBED was less than 1.3%.The MPRD of the average dose for organs at risk(OARs)was less than 1.5%.The MPRDs of the lung V5,V20,and V30 were 1.29%,3.26%,and 2.78%,respectively.Gamma analysis revealed an averaged pass rate of>95.0%for the body,as well as between 91.9%and 98.2%for OARs.Conclusion The proposed IBED assignment in simulated MRI-only treatment planning allows for dose calculation with comparable accuracy to the baseline plan and is appropriate for thoracic tumors.展开更多
文摘The development of digital intelligent diagnostic and treatment technology has opened countless new opportunities for liver surgery from the era of digital anatomy to a new era of digital diagnostics,virtual surgery simulation and using the created scenarios in real-time surgery using mixed reality.In this article,we described our experience on developing a dedicated 3 dimensional visualization and reconstruction software for surgeons to be used in advanced liver surgery and living donor liver transplantation.Furthermore,we shared the recent developments in the field by explaining the outreach of the software from virtual reality to augmented reality and mixed reality.
文摘Purpose: To clarify the effectiveness of 3-D delivery animation software for the mother’s and husband’s satisfaction with delivery. Subjects and Method: We independently developed a software application used to display the pelvic region and explain the labor process. The study involved a collaboration with hospital staff who recruited 18 primiparous and 18 multiparous mothers who were hospitalized for delivery at Facility A. The midwife explained the process of delivery using the “Delivery Animation Software”. A self-administered, anonymous questionnaire was distributed and analyzed separately for primiparous and multiparous mothers and their husbands. Results: 1) For both primiparous and multiparous couples, both mothers and their husbands gained a significantly higher level of understanding after delivery than during pregnancy. 2) The Self-Evaluation Scale for Experience of Delivery results were as follows: “I did my best for the baby even if it was painful” was selected more often for “birth coping skills”;“reliable medical staff” was selected more often for “physiological birth process”;“the birth progressed as I expected” was selected frequently by primiparous mothers;and “the birth progressed smoothly” was selected often by multiparous mothers. 3) In terms of husbands’ satisfaction with the delivery, “I was satisfied with the delivery”, “I was given an easy-to-understand explanation”, and “They explained the process to me” was selected of primiparous and multiparous fathers. 4) All primiparous and multiparous mothers positively evaluated whether the delivery animation was helpful in understanding the process of delivery. Conclusion: The delivery animation was effective in improving the understanding and satisfaction of both the mothers and their husbands.
基金supported by the National Key Research and Development Program of China(Grant No.2022YFA1405900)the National Natural Science Foundation of China(Grant Nos.U2441217 and 12074058)Sichuan Science and Technology Program(Grant No.2024YFHZ0372)。
文摘We study the stability and dynamic behaviors of skyrmions in magnetic nanotubes,where curvature and cylindrical symmetry provide unique mechanisms for skyrmion formation and control.Unlike planar geometries,skyrmions confined in nanotubes exhibit elliptical shapes,stabilized through the interplay of curvature-induced effects,Dzyaloshinskii-Moriya interaction(DMI),and magnetic anisotropy.Using micromagnetic simulations,we construct phase diagrams of skyrmion stability as functions of DMI strength and anisotropy,identifying transitions to saturated or helical configurations in unstable regimes.The dynamics reveal distinct counterclockwise gyration modes,strongly influenced by tube geometry and applied microwave fields.We find that external magnetic fields significantly enhance the azimuthal velocity(v_(φ))while maintaining a consistent axial motion(v_(z))along the-z-direction.Furthermore,transitions between gyration and linear translation modes emerge,governed by the combined effects of magnetic field,DMI,and curvature.Notably,the skyrmion's motion direction depends on the excitation mode and DMI sign,while curvature-modified spin textures produce effective fields without conventional pinning.These results demonstrate that magnetic nanotubes offer a robust and tunable platform for skyrmion manipulation,with potential applications in next-generation memory and logic devices.Our findings also highlight the role of curvature in enabling stable and controllable topological spin textures for advanced spintronic technologies.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12175180,11934015,and12247103,Shaanxi Fundamental Science Research Project for Mathematics and Physics(Grant Nos.22JSZ005 and22JSQ041)the Natural Science Basic Research Program of Shaanxi Province,China(Grant No.2024JC-YBMS-022)。
文摘Understanding skyrmion–skyrmion interactions and their dynamical effects is crucial for skyrmion-based applications.In this article,we investigate the deformation of skyrmions induced by the inter-skyrmion interaction in both static and dynamic scenarios for a two-skyrmion system.In the static case under a pinning magnetic field,the inter-skyrmion interaction energy decreases rapidly with increasing separation between the skyrmions,while their individual sizes grow.The semiaxis ratio of the elliptical skyrmion exhibits non-monotonic behavior,owing to the competition between skyrmion–skyrmion interactions and pinning effects.In dynamic simulations after removing the external pinning field,the two skyrmions spiral away from each other with increasing separation.Following a rapid relaxation period after magnetic field withdrawal,their semiaxis ratio typically increases with distance and the skyrmions gradually approach a perfect circular shape.These findings provide valuable insights into the behavior and interactions of two-skyrmion systems.
基金supported by the National Key R&D Program of China(Grant No.2022YFA1402802)the National Natural Science Foundation of China(Grant Nos.12434003,12374103,and 12074057).
文摘We investigate the skyrmion motion driven by spin waves on magnetic nanotubes through micromagnetic simulations.Our key results include demonstrating the stability and enhanced mobility of skyrmions on the edgeless nanotube geometry,which prevents destruction at boundaries—a common issue in planar geometries.We explore the influence of the damping coefficient,amplitude,and frequency of microwaves on skyrmion dynamics,revealing a non-uniform velocity profile characterized by acceleration and deceleration phases.Our results show that the skyrmion Hall effect is significantly modulated on nanotubes compared to planar models,with specific dependencies on the spin-wave parameters.These findings provide insights into skyrmion manipulation for spintronic applications,highlighting the potential for high-speed and efficient information transport in magnonic devices.
基金supported by the National Key R&D Program China (Grant No.2022YFA1402802)the National Natural Science Foundation of China (Grant Nos.12374103 and 12074057)。
文摘Within the magnonics community,there has been a lot of interests in the magnon–skyrmion interaction.Magnons and skyrmions are two intriguing phenomena in condensed matter physics,and magnetic nanotubes have emerged as a suitable platform to study their complex interactions.We show that magnon frequency combs can be induced in magnetic nanotubes by three-wave mixing between the propagating magnons and skyrmion.This study enriches our fundamental comprehension of magnon–skyrmion interactions and holds promise for developing innovative spintronic devices and applications.This frequency comb tunability and unique spectral features offer a rich platform for exploring novel avenues in magnetic nanotechnology.
文摘Rolling force and temperature field are important parameters in the hot rolling process of plate steel.Most researchers use ANSYS/LS-DYNA and MSC.Marc to simulate the hot rolling process,however,software DEFORM-3D is not used widely in this field.Therefore,in this study,the commercially available finite element analysis software DEFORM-3D is used to simulate the distribution of rolling force,stress-effective,strain-effective and temperature field during the hot rolling process of plate steel with the size of 0.220 m×2.070 m×1.904 m.Both the simulated rolling force and temperature of the multi-pass are compared with the measured results.It is shown that the simulated values by the finite element method are approximate to the measured values in the hot rolling of plate steel.So the simulation can provide an important reference and optimization to make rolling process and parameters in steel factory.
基金This paper was supported by the Natural Science Foundation of Jiangsu Higher Education Institutions(No.20KJB440002)the National Natural Science Foundation of China(Project Nos.51804129,51808246 and 51904112)+5 种基金China Postdoctoral Science Foundation(No.2020M671301)the Postdoctoral Science Foundation of Jiangsu Province(Nos.2019K139 and 2019Z107)the Huai’an Science and Technology Plan project(No.HAB201836)the Industry Education Research Cooperation Projects in Jiangsu Province(No.BY2020007)Undergraduate Innovation and Entrepreneurship Training Program(No.202011049111XJ)the Foundation of Huaiyin Institute of Technology(No.Z301B20530).
文摘Extraction of a protective coal seam (PVCS)-below or above a coal seam to be mined with the potential of coal andgas outburst risk-plays an important role not only in decreasing the stress field in the surrounding rock mass but alsoin increasing the gas desorption capacity and gas flow permeability in the protected coal seam (PTCS). The PVCSis mined to guarantee the safe mining of the PTCS. This study has numerically evaluated the stress redistributioneffects using FLAC3D model for a longwall face in Shanxi Province. The effects of mining depth, mining height andinter-burden rock mass properties were evaluated using the stress relief angle and stress relief coefficient. Verticalstress distribution, stress relief angle and stress relief coefficient in the PTCS were analyzed as the face advancedin the PVCS. The results showed that the stress relief achieved in different locations of the PTCS varied as the faceadvanced. Sensitivity analyses on the pertinent variables indicate that the stress relief in the PTCS is affected mostby the mining depth followed by the inter-burden lithology and the mining height. Furthermore, the elastic moduliof different layers within the inter-burden rock mass are more important than their uniaxial compressive strength(UCS) and Poisson’s ratio. These observations can guide gas drainage borehole design to minimize the accidentsof coal and gas outbursts.
文摘Slope stability is one of the most important subjects of geotechnics. The slope top-loading plays a key role in the stability of slopes in hill slope areas. When the building load is too large or the point of action from the shoulder is too close, the shear stress of the slope will be significantly greater than its shear strength, resulting in reduced slope stability. Therefore, it is of great importance to study the relationship between the building load and the stability of the slope. This study aims to analyze the influence of different building loads applied at different distances on the top of the slope and deduces their effects on the slope stability. For this purpose, a three-dimensional slope model under different building loads with different distances to the slope shoulder was established using the finite-difference analysis software Flac3D. The results show that the loads applied at different distances on the top of the slope have different effects on the slope stability. The slope factor of safety (FOS) increases with the increase of the distance between the top-loading and the slope shoulder;it varies from 1.37 to 1.53 for the load P = 120 KPa, 1.27 to 1.53 for the load P = 200 KPa, and from 1.18 to 1.44 for P = 300 KPa, resulting in the decrease of the coincidence area between the load-deformation and the potential sliding surface. The slope is no longer affected by the potential risk of sliding at approximately 20 m away from the slope shoulder.
基金Guangzhou Special Fund for Scientific and Technological Innovation Development(Grant No.201804010297)
文摘Objective This study aimed to investigate the dose calculation accuracy of individualized bulk electron density(IBED)assignment approaches for simulated magnetic resonance imaging(MRI)-only planning of thoracic tumors via the use of a 3 DVH system.Methods 8 patients with thoracic cancer were included in this study.Based on standard planning CT,single-arc dynamic conformal therapy(DCT)and double-arc volumetric modulated arc therapy(VMAT)plans with a6 MV photon beam were generated as a baseline plan(Plan-CT)for each patient.The simulated MRI-only planning(Plan-IBED)was implemented by copying the Plan-CT and forcing the electron density of each region of interest to its average value and recalculating the dose distribution.A 3 DVH system was used to visualize and compare the dosimetric differences between Plan-CT and Plan-IBED,and the criteria of the 3 D-Gamma pass rate were set to 1.0%/1.0 mm.Results The maximum percentage relative deviation(MPRD)of the dosimetric parameters D2,D95,D98,and Dmean of planning tumor volumes(PTVs)between Plan-CT and Plan-IBED was less than 1.3%.The MPRD of the average dose for organs at risk(OARs)was less than 1.5%.The MPRDs of the lung V5,V20,and V30 were 1.29%,3.26%,and 2.78%,respectively.Gamma analysis revealed an averaged pass rate of>95.0%for the body,as well as between 91.9%and 98.2%for OARs.Conclusion The proposed IBED assignment in simulated MRI-only treatment planning allows for dose calculation with comparable accuracy to the baseline plan and is appropriate for thoracic tumors.
