Optical field manipulation,an emerging frontier in photonics,demonstrates significant potential in biomedical microscopy,quantum state engineering,and micro-nano fabrication.To address the critical limitations of curr...Optical field manipulation,an emerging frontier in photonics,demonstrates significant potential in biomedical microscopy,quantum state engineering,and micro-nano fabrication.To address the critical limitations of current optical modulation technologies in achieving full-parameter precision control,we proposed a novel approach for dynamic azimuthal optical field modulation based on dual-spiral arrays.By designing spatially interleaved spiral structures with different initial radii while maintaining identical periodic parameters,we achieved continuous optical modulation spanning the full 0-2πrange in azimuthal field distribution.Through rigorous numerical simulations,we systematically established a quantitative correlation between the structural parameters and azimuthal optical field patterns,revealing,for the first time,a quasi-linear relationship between the radius difference and the resultant optical distribution.This theoretical framework advances our fundamental understanding of structured optical field manipulation as well as provides a new paradigm for programmable photonic device design,with distinct technical advantages in super-resolution imaging and optical tweezer systems.展开更多
The ammunition loading system manipulator is susceptible to gear failure due to high-frequency,heavyload reciprocating motions and the absence of protective gear components.After a fault occurs,the distribution of fau...The ammunition loading system manipulator is susceptible to gear failure due to high-frequency,heavyload reciprocating motions and the absence of protective gear components.After a fault occurs,the distribution of fault characteristics under different loads is markedly inconsistent,and data is hard to label,which makes it difficult for the traditional diagnosis method based on single-condition training to generalize to different conditions.To address these issues,the paper proposes a novel transfer discriminant neural network(TDNN)for gear fault diagnosis.Specifically,an optimized joint distribution adaptive mechanism(OJDA)is designed to solve the distribution alignment problem between two domains.To improve the classification effect within the domain and the feature recognition capability for a few labeled data,metric learning is introduced to distinguish features from different fault categories.In addition,TDNN adopts a new pseudo-label training strategy to achieve label replacement by comparing the maximum probability of the pseudo-label with the test result.The proposed TDNN is verified in the experimental data set of the artillery manipulator device,and the diagnosis can achieve 99.5%,significantly outperforming other traditional adaptation methods.展开更多
Development of tools that can manipulate gene expression specifically and efficiently in the trophectoderm（TE） lineage would greatly aid understanding the roles of different genetic pathways in TE versus embryonic l...Development of tools that can manipulate gene expression specifically and efficiently in the trophectoderm（TE） lineage would greatly aid understanding the roles of different genetic pathways in TE versus embryonic lineages. Here, we showed first time that short-term lentivirus infection of porcine blastocysts could lead to rapid expression of transgene specifically in TE cells. Efficient TE-specific gene knockdown could also be achieved by lentivirus-mediated pol III-driven short hairpin RNA（shRNA） and TE-specific gene expression could be temporal controlled efficiently by combining this system with Tet-On system. This lentivirus lineage-specific infection system would facilitate gene function studies in porcine pre-implatation embryos by specifically knockdown or overexpression of these genes in TE.展开更多
To deploy sensor nodes over the area of interest,a scheme,named node scattering manipulation,was proposed.It adopted the following method:during node scattering,the initial states of every node,including the velocity ...To deploy sensor nodes over the area of interest,a scheme,named node scattering manipulation,was proposed.It adopted the following method:during node scattering,the initial states of every node,including the velocity and direction,were manipulated so that it would land in a region with a certain probability;every sensor was relocated in order to improve the coverage and connectivity.Simultaneously,to easily analyze the process of scattering sensors,a trajectory model was also proposed.Integrating node scattering manipulation with trajectory model,the node deployment in wireless sensor network was thoroughly renovated,that is,this scheme can scatter sensors.In practice,the scheme was operable compared with the previous achievements.The simulation results demonstrate the superiority and feasibility of the scheme,and also show that the energy consumption for sensors relocation is reduced.展开更多
Manipulation of terahertz wave by metasurfaces has shown tremendous potential in developing compact and functional terahertz optical devices.Here,we propose complementary bilayer metasurfaces for enhanced terahertz wa...Manipulation of terahertz wave by metasurfaces has shown tremendous potential in developing compact and functional terahertz optical devices.Here,we propose complementary bilayer metasurfaces for enhanced terahertz wave amplitude and phase manipulation.The metasurfaces are composed of one layer of metal cut-wire arrays and one layer of their complementary aperture arrays separated by a dielectric spacer.Through the near-field coupling between transverse magnetic resonances in the metal apertures and electric resonances in the metal cut-wires,the structures can manipulate the cross polarization conversion and phase dispersion of terahertz wave.Particularly,the designed metasurfaces demonstrate a phase delay of 180°between two orthogonal axes with the same transmission amplitude between 0.70 and 1.0 THz,enabling a 45°broadband polarization conversion.When the metal cut-wires are rotated with respect to the apertures or the thickness of the dielectric spacer is changed,the amplitude and phase dispersion of the transmitted terahertz wave can be tuned.Such complementary coupled bilayer metasurfaces offer a new method to control the amplitude and phase dispersion of terahertz wave and promise great potential for applications in terahertz meta-devices.展开更多
Plant regeneration is the first step to cotton biotechnology.We screened over 100 genotypes and found two genotypes,YZ-1 and Y668,which are very easy to regenerate.It takes about 5 to 6
Satellites with altitudes below 400 km are called super low altitude satellites(SLAS),often used to achieve responsive imaging tasks.Therefore,it is important for the manipulation of its ground track.Aiming at the pro...Satellites with altitudes below 400 km are called super low altitude satellites(SLAS),often used to achieve responsive imaging tasks.Therefore,it is important for the manipulation of its ground track.Aiming at the problem of ground track manipulation of SLAS,a control method based on tangential impulse thrust is proposed.First,the equation of the longitude difference between SLAS and the target point on the target latitude is derived based on Gauss’s variational equations.On this basis,the influence of the tangential impulse thrust on the ground track’s longitude is derived.Finally,the method for ground track manipulation of SLAS under the tangential impulse thrust is proposed.The simulation results verify the effective-ness of the method,after manipulation,the satellite can visit the target point and revisit it for multiple days.展开更多
Redacted by Specialty Committee of Heat-sensitive Moxibustion of WFCMS,Standardized Manipulations of Heat-sensitive Moxibustion(HSM).Therapy states the scope,normative references,terms and definitions,preoperative pre...Redacted by Specialty Committee of Heat-sensitive Moxibustion of WFCMS,Standardized Manipulations of Heat-sensitive Moxibustion(HSM).Therapy states the scope,normative references,terms and definitions,preoperative preparations,operation methods and procedure,indications and notice of HSM Therapy.展开更多
Aiming at the shortcoming that the traditional industrial manipulator using off-line programming cannot change along with the change of external environment,the key technologies such as machine vision and manipulator ...Aiming at the shortcoming that the traditional industrial manipulator using off-line programming cannot change along with the change of external environment,the key technologies such as machine vision and manipulator control are studied,and a complete manipulator vision tracking system is designed.Firstly,Denavit-Hartenberg(D-H)parameters method is used to construct the model of the manipulator and analyze the forward and inverse kinematics equations of the manipulator.At the same time,a binocular camera is used to obtain the threedimensional position of the target.Secondly,in order to make the manipulator track the target more accurately,the fuzzy adaptive square root unscented Kalman filter(FSRUKF)is proposed to estimate the target state.Finally,the manipulator tracking system is built by using the position-based visual servo.The simulation experiments show that FSRUKF converges faster and with less error than the square root unscented Kalman filter(SRUKF),which meets the application requirements of the manipulator tracking system,and basically meets the application requirements of the manipulator tracking system in the practical experiments.展开更多
Basal level of Animal Production is maintained with regulation of endocrine to concert genetic potential and environmental conditions. This balance can be moved to dramatical imporvements in rate and efficiency of pro...Basal level of Animal Production is maintained with regulation of endocrine to concert genetic potential and environmental conditions. This balance can be moved to dramatical imporvements in rate and efficiency of production as well as composition of the products by biotechnological methods. In this paper, several novel achievements in the last decade are briefly reviewed for refference to further research and application of biotedchnology in animal production.展开更多
A 6-DOF micro-manipulation robot based on a 3-PPTTRS mechanism is proposed in this paper.Its static stiffness is an important index to evaluate load capacity and positioning accuracy.However,it is insufficient to cons...A 6-DOF micro-manipulation robot based on a 3-PPTTRS mechanism is proposed in this paper.Its static stiffness is an important index to evaluate load capacity and positioning accuracy.However,it is insufficient to consider the static stiffness only when the robot is in its initial pose.The stiffness in different positions and poses in its work space must be analyzed also.Thus a method to analyze the relationship between static stiffness and poses in the whole work space is presented.A static stiffness model is proposed first,and the relationship between structural parameters and static stiffness in different poses is discussed.The static stiffness analysis provides foundation for structural parameter design.展开更多
文摘Optical field manipulation,an emerging frontier in photonics,demonstrates significant potential in biomedical microscopy,quantum state engineering,and micro-nano fabrication.To address the critical limitations of current optical modulation technologies in achieving full-parameter precision control,we proposed a novel approach for dynamic azimuthal optical field modulation based on dual-spiral arrays.By designing spatially interleaved spiral structures with different initial radii while maintaining identical periodic parameters,we achieved continuous optical modulation spanning the full 0-2πrange in azimuthal field distribution.Through rigorous numerical simulations,we systematically established a quantitative correlation between the structural parameters and azimuthal optical field patterns,revealing,for the first time,a quasi-linear relationship between the radius difference and the resultant optical distribution.This theoretical framework advances our fundamental understanding of structured optical field manipulation as well as provides a new paradigm for programmable photonic device design,with distinct technical advantages in super-resolution imaging and optical tweezer systems.
文摘The ammunition loading system manipulator is susceptible to gear failure due to high-frequency,heavyload reciprocating motions and the absence of protective gear components.After a fault occurs,the distribution of fault characteristics under different loads is markedly inconsistent,and data is hard to label,which makes it difficult for the traditional diagnosis method based on single-condition training to generalize to different conditions.To address these issues,the paper proposes a novel transfer discriminant neural network(TDNN)for gear fault diagnosis.Specifically,an optimized joint distribution adaptive mechanism(OJDA)is designed to solve the distribution alignment problem between two domains.To improve the classification effect within the domain and the feature recognition capability for a few labeled data,metric learning is introduced to distinguish features from different fault categories.In addition,TDNN adopts a new pseudo-label training strategy to achieve label replacement by comparing the maximum probability of the pseudo-label with the test result.The proposed TDNN is verified in the experimental data set of the artillery manipulator device,and the diagnosis can achieve 99.5%,significantly outperforming other traditional adaptation methods.
基金Supported by the Scientifi c Research Fund of Heilongjiang Provincial Education Department(11551039)
文摘Development of tools that can manipulate gene expression specifically and efficiently in the trophectoderm（TE） lineage would greatly aid understanding the roles of different genetic pathways in TE versus embryonic lineages. Here, we showed first time that short-term lentivirus infection of porcine blastocysts could lead to rapid expression of transgene specifically in TE cells. Efficient TE-specific gene knockdown could also be achieved by lentivirus-mediated pol III-driven short hairpin RNA（shRNA） and TE-specific gene expression could be temporal controlled efficiently by combining this system with Tet-On system. This lentivirus lineage-specific infection system would facilitate gene function studies in porcine pre-implatation embryos by specifically knockdown or overexpression of these genes in TE.
基金Project(2007AA01Z224) supported by National High-Tech Research and Development Program of China
文摘To deploy sensor nodes over the area of interest,a scheme,named node scattering manipulation,was proposed.It adopted the following method:during node scattering,the initial states of every node,including the velocity and direction,were manipulated so that it would land in a region with a certain probability;every sensor was relocated in order to improve the coverage and connectivity.Simultaneously,to easily analyze the process of scattering sensors,a trajectory model was also proposed.Integrating node scattering manipulation with trajectory model,the node deployment in wireless sensor network was thoroughly renovated,that is,this scheme can scatter sensors.In practice,the scheme was operable compared with the previous achievements.The simulation results demonstrate the superiority and feasibility of the scheme,and also show that the energy consumption for sensors relocation is reduced.
基金supported in part by the National Research Foundation, Prime Minister’s Office,Singapore under its Competitive Research Program (CRP Award No. NRF-CRP10-2012-04)in part by EDB, Singapore with grant No. S15-1322-IAF OSTIn-SIAG
文摘Manipulation of terahertz wave by metasurfaces has shown tremendous potential in developing compact and functional terahertz optical devices.Here,we propose complementary bilayer metasurfaces for enhanced terahertz wave amplitude and phase manipulation.The metasurfaces are composed of one layer of metal cut-wire arrays and one layer of their complementary aperture arrays separated by a dielectric spacer.Through the near-field coupling between transverse magnetic resonances in the metal apertures and electric resonances in the metal cut-wires,the structures can manipulate the cross polarization conversion and phase dispersion of terahertz wave.Particularly,the designed metasurfaces demonstrate a phase delay of 180°between two orthogonal axes with the same transmission amplitude between 0.70 and 1.0 THz,enabling a 45°broadband polarization conversion.When the metal cut-wires are rotated with respect to the apertures or the thickness of the dielectric spacer is changed,the amplitude and phase dispersion of the transmitted terahertz wave can be tuned.Such complementary coupled bilayer metasurfaces offer a new method to control the amplitude and phase dispersion of terahertz wave and promise great potential for applications in terahertz meta-devices.
文摘Plant regeneration is the first step to cotton biotechnology.We screened over 100 genotypes and found two genotypes,YZ-1 and Y668,which are very easy to regenerate.It takes about 5 to 6
基金supported by the National Natural Science Foundation of China(11972130)the Heilongjiang Touyan Team Program(11972130).
文摘Satellites with altitudes below 400 km are called super low altitude satellites(SLAS),often used to achieve responsive imaging tasks.Therefore,it is important for the manipulation of its ground track.Aiming at the problem of ground track manipulation of SLAS,a control method based on tangential impulse thrust is proposed.First,the equation of the longitude difference between SLAS and the target point on the target latitude is derived based on Gauss’s variational equations.On this basis,the influence of the tangential impulse thrust on the ground track’s longitude is derived.Finally,the method for ground track manipulation of SLAS under the tangential impulse thrust is proposed.The simulation results verify the effective-ness of the method,after manipulation,the satellite can visit the target point and revisit it for multiple days.
文摘Redacted by Specialty Committee of Heat-sensitive Moxibustion of WFCMS,Standardized Manipulations of Heat-sensitive Moxibustion(HSM).Therapy states the scope,normative references,terms and definitions,preoperative preparations,operation methods and procedure,indications and notice of HSM Therapy.
基金supported by Natural Science Basic Research Program of Shaanxi(2022JQ-593)Key Research and Development Program of Shaanxi(2022GY-089)。
文摘Aiming at the shortcoming that the traditional industrial manipulator using off-line programming cannot change along with the change of external environment,the key technologies such as machine vision and manipulator control are studied,and a complete manipulator vision tracking system is designed.Firstly,Denavit-Hartenberg(D-H)parameters method is used to construct the model of the manipulator and analyze the forward and inverse kinematics equations of the manipulator.At the same time,a binocular camera is used to obtain the threedimensional position of the target.Secondly,in order to make the manipulator track the target more accurately,the fuzzy adaptive square root unscented Kalman filter(FSRUKF)is proposed to estimate the target state.Finally,the manipulator tracking system is built by using the position-based visual servo.The simulation experiments show that FSRUKF converges faster and with less error than the square root unscented Kalman filter(SRUKF),which meets the application requirements of the manipulator tracking system,and basically meets the application requirements of the manipulator tracking system in the practical experiments.
文摘Basal level of Animal Production is maintained with regulation of endocrine to concert genetic potential and environmental conditions. This balance can be moved to dramatical imporvements in rate and efficiency of production as well as composition of the products by biotechnological methods. In this paper, several novel achievements in the last decade are briefly reviewed for refference to further research and application of biotedchnology in animal production.
文摘A 6-DOF micro-manipulation robot based on a 3-PPTTRS mechanism is proposed in this paper.Its static stiffness is an important index to evaluate load capacity and positioning accuracy.However,it is insufficient to consider the static stiffness only when the robot is in its initial pose.The stiffness in different positions and poses in its work space must be analyzed also.Thus a method to analyze the relationship between static stiffness and poses in the whole work space is presented.A static stiffness model is proposed first,and the relationship between structural parameters and static stiffness in different poses is discussed.The static stiffness analysis provides foundation for structural parameter design.
