An autostereoscopic display composed of a directional backlight, an image display panel, a striped half-wave plate,and a polarized lenticular lens array is proposed. The directional backlight emitting the parallel lig...An autostereoscopic display composed of a directional backlight, an image display panel, a striped half-wave plate,and a polarized lenticular lens array is proposed. The directional backlight emitting the parallel light can redirect the cones of light to lenticular lens array and reduce the chromatic spatial-interference effect. The striped half-wave plate, located in front of the image display panel, transformed the polarization direction of the lights from the directional backlight into two mutually perpendicular directions. The polarized lenticular lens array not only can divide the light from the left and right view images to send to left and right eyes but also can reduce the crosstalk of the stereoscopic images. The proposed autostereoscopic display can produce high quality stereoscopic images without crosstalk at the optimal viewing distance.展开更多
This paper seeks to outline the temperature effect on the buckling properties of ultra-thin-walled lenticular collapsible composite tube（LCCT） subjected to axial compression.The buckling tests of the LCCT specimens ...This paper seeks to outline the temperature effect on the buckling properties of ultra-thin-walled lenticular collapsible composite tube（LCCT） subjected to axial compression.The buckling tests of the LCCT specimens subjected to axial compression were carried out on INSTRON-500 N servo-hydraulic machine in dry state and at the temperatures of 25 C, 100 C and 80 C. The load–displacement curves and buckling initiation loads were measured and the buckling initiation mechanism was discussed from experimental observations. Experiments show that the buckling initiation load, on average, is only about 2.2% greater at the low temperature of 80 C than at the room temperature of 25 C due to the material hardening, demonstrating an insignificant increase in the buckling initiation load, whereas it is about 19.5% lower at the high temperature of 100 C than at the room temperature owing to the material softening, implying a significant decrease in the buckling initiation load. The failure mode of the LCCT in axial compression tests at three different temperatures can be reckoned to be characteristic of the buckling initiation and propagation around the central region until rupture. The finite element（FE） model is presented to simulate the buckling initiation mechanism based on the eigenvalue-based methodology. Good correlation between experimental and numerical results is achieved.展开更多
The stowing and deploying experiment was conducted for three 700 mm long thin-walled tubes,and the structural behavior characteristics parameters were measured clearly,including strain,deformation and wrapping moment....The stowing and deploying experiment was conducted for three 700 mm long thin-walled tubes,and the structural behavior characteristics parameters were measured clearly,including strain,deformation and wrapping moment.3D finite element models(FEM)were built subsequently and explicit dynamic method was used to simulate the stowing and deploying of the lenticular carbon fiber reinforced polymer(CFRP)thin-walled tubular space boom,which was designed as four-ply(45°/-45°/45°/-45°)lay-up.The stress and energy during the wrapping process were got and compared with different wrapping angular velocity,the reasonable wrapping angular velocity and effective method were conformed,and structural behavior characteristics were obtained.The results were compared and discussed as well,and the results show that the numerical results by 0.628 rad/s velocity agree well with the measured values.In this paper,the numerical procedure and experimental results are valuable to the optimization design of CFRP thin-walled tubular space boom and future research.展开更多
The twinned substructure of lenticular martensite in a quenched Fe–33Ni alloy was studied.In contrary to the traditional viewpoint that the twinned laths come from{112}<111>deformation twins and show insignific...The twinned substructure of lenticular martensite in a quenched Fe–33Ni alloy was studied.In contrary to the traditional viewpoint that the twinned laths come from{112}<111>deformation twins and show insignificant hardening,we demonstrate that they are actually originated from the twinned Kurdjumov Sachs(KS)variants and can give rise to 3–4 times hardening up to~420 HV(~130 HV for the starting sample).The underlying mechanisms responsible for the propensity for twinned variants and the carbon-independent hardening for Fe–Ni system were discussed.展开更多
Objective To establish a 3D atlas of the lenticular nuclei and its subnucleus with the cryosection images of the male from "Atlas of Chinese Visible Human". Methods The lenticular nuclei and its subnucleus w...Objective To establish a 3D atlas of the lenticular nuclei and its subnucleus with the cryosection images of the male from "Atlas of Chinese Visible Human". Methods The lenticular nuclei and its subnucleus were segmented from the cryosection images and reconstructed with the software展开更多
Objective: To assess the efficacy of hepatic lenticular degeneration (HLD) relief decoction in treating HLD. Methods: Intelligence quotient (IQ) of 28 (HLD) patients was analysed with Wechsler Adult Intelligence Scale...Objective: To assess the efficacy of hepatic lenticular degeneration (HLD) relief decoction in treating HLD. Methods: Intelligence quotient (IQ) of 28 (HLD) patients was analysed with Wechsler Adult Intelligence Scale-revised by China (WAIS-RC) before and after treatment by the HLD-Relief decoction supplemented with copper-clearing drug, and the result was compared with that of 30 healthy persons for control. Results: The Vocable to (VIQ), Performance to (PIQ) and Full to (FIQ) of HLD patients were markedly lower than those of the control (P < 0. 005), especially in visual space disorder, which indicated that the copper ion depositing in patient's brain not only damaged neuronic motorial functions but also produced a marked effect on the patient's intelligence. After treatment, the intelligence levels including VIQ, PIQ and FIQ was raised, particularly in PIQ in which all scores were obviously increased (P < 0. 001 ). It was also shown that the damage of intelligence in HLD patients became more serious as the course of disease was prolonged and early treatment facilitated the to level to approach the normal criterion. Conclusion: The combined treatment is effective to the recovery of intelligence and extrapyramidal symptoms in HLD patients.展开更多
Lenticular printing technique provides a promising way to realize stereoscopic displays,especially,when microscopic optical structures are integrated into light-emitting materials/devices.Here,we fabricated large-area...Lenticular printing technique provides a promising way to realize stereoscopic displays,especially,when microscopic optical structures are integrated into light-emitting materials/devices.Here,we fabricated large-area periodic structures with a spatial resolution at a wavelength scale from hybrid perovskite materials via a space-confined solution growth method.It takes advantages of both high refractive index contrast and high luminescence brightness,which allows the optical modulation on not only the reflection of illumination,but also the light emission from hybrid perovskites.The distributed feedback within these periodic structures significantly improves the degree of polarization and directionality of laser actions while their threshold is also reduced.These findings enable us to present a prototype of lenticular printing laser displays that vary emission colors at different view angles,which may find applications in creating high-resolution and high-contrast holographical images.展开更多
As an alternative gravitational theory to general relativity(GR),conformal gravity(CG)has recently been successfully veri/ed by observations of type Ia supernovae(SN Ia)and the rotation curves of spiral galaxies.The o...As an alternative gravitational theory to general relativity(GR),conformal gravity(CG)has recently been successfully veri/ed by observations of type Ia supernovae(SN Ia)and the rotation curves of spiral galaxies.The observations of galaxies only pertain to the non-relativistic form of gravity.In this context,within the framework of the Newtonian theory of gravity(the non-relativistic form of GR),dark matter(DM)is postulated to account for the observations.On the other hand,the non-relativistic form of CG predicts an additional potential:besides the Newtonian potential,there is a so-called linear potential term,characterized by the parameterγ*,as an alternative to DM in Newtonian gravity.To test CG in its non-relativistic form,much work has been done by/tting the predictions to the observations of circular velocity(rotation curves)for spiral galaxies.In this paper,we test CG with the observations from elliptical galaxies.Instead of the circular velocities for spiral galaxies,we use the velocity dispersion for elliptical galaxies.By replacing the Newtonian potential with that predicted by the nonrelativistic form of CG in the Hamiltonian,we directly extend the Jeans equation derived in Newtonian theory to that for CG.By comparing the results derived from the ellipticals with those from spirals,we/nd that the extra potential predicted by CG is not suf/cient to account for the observations of ellipticals.Furthermore,we discover a strong correlation betweenγ*and the stellar mass M*in dwarf spheroidal galaxies.This/nding implies that the variation inγ*violates a fundamental prediction of CG,which posits thatγ*should be a universal constant.展开更多
基金Project supported by the National High Technology Research and Development Program of China(Grant No.2012AA03A301)the National Natural Science Foundation of China(Grant No.60932007)+1 种基金the Postdoctoral Science Programs Foundation of the Ministry of Education of China(Grant No.0110032110029)the Key Projects in the Tianjin Science & Technology Pillar Program,China(Grant No.11ZCKFGX02000)
文摘An autostereoscopic display composed of a directional backlight, an image display panel, a striped half-wave plate,and a polarized lenticular lens array is proposed. The directional backlight emitting the parallel light can redirect the cones of light to lenticular lens array and reduce the chromatic spatial-interference effect. The striped half-wave plate, located in front of the image display panel, transformed the polarization direction of the lights from the directional backlight into two mutually perpendicular directions. The polarized lenticular lens array not only can divide the light from the left and right view images to send to left and right eyes but also can reduce the crosstalk of the stereoscopic images. The proposed autostereoscopic display can produce high quality stereoscopic images without crosstalk at the optimal viewing distance.
基金supported by the National Natural Science Foundation of China (Nos. 51075019 and 51375033)Aeronautical Science Foundation (No. 20095251024) of Chinathe Fundamental Research Funds for the Central Universities (No. YWF-13-T-RSC-121) of China
文摘This paper seeks to outline the temperature effect on the buckling properties of ultra-thin-walled lenticular collapsible composite tube（LCCT） subjected to axial compression.The buckling tests of the LCCT specimens subjected to axial compression were carried out on INSTRON-500 N servo-hydraulic machine in dry state and at the temperatures of 25 C, 100 C and 80 C. The load–displacement curves and buckling initiation loads were measured and the buckling initiation mechanism was discussed from experimental observations. Experiments show that the buckling initiation load, on average, is only about 2.2% greater at the low temperature of 80 C than at the room temperature of 25 C due to the material hardening, demonstrating an insignificant increase in the buckling initiation load, whereas it is about 19.5% lower at the high temperature of 100 C than at the room temperature owing to the material softening, implying a significant decrease in the buckling initiation load. The failure mode of the LCCT in axial compression tests at three different temperatures can be reckoned to be characteristic of the buckling initiation and propagation around the central region until rupture. The finite element（FE） model is presented to simulate the buckling initiation mechanism based on the eigenvalue-based methodology. Good correlation between experimental and numerical results is achieved.
基金the National Natural Science Foundation of China(No.50878128)the Shanghai Aerospace Foundation(No.HTJ10-15)
文摘The stowing and deploying experiment was conducted for three 700 mm long thin-walled tubes,and the structural behavior characteristics parameters were measured clearly,including strain,deformation and wrapping moment.3D finite element models(FEM)were built subsequently and explicit dynamic method was used to simulate the stowing and deploying of the lenticular carbon fiber reinforced polymer(CFRP)thin-walled tubular space boom,which was designed as four-ply(45°/-45°/45°/-45°)lay-up.The stress and energy during the wrapping process were got and compared with different wrapping angular velocity,the reasonable wrapping angular velocity and effective method were conformed,and structural behavior characteristics were obtained.The results were compared and discussed as well,and the results show that the numerical results by 0.628 rad/s velocity agree well with the measured values.In this paper,the numerical procedure and experimental results are valuable to the optimization design of CFRP thin-walled tubular space boom and future research.
基金We gratefully acknowledge the financial support of the Natural Science Foundation-Steel and Iron Foundation of Hebei Province(E2021203051)the Hundred Outstanding Creative Talents Projects in universities of Hebei Province,China,the Project Program of Heavy Machinery Collaborative Innovation Center,China,the Natural Science Foundation of Hubei Province(2020BED011).
文摘The twinned substructure of lenticular martensite in a quenched Fe–33Ni alloy was studied.In contrary to the traditional viewpoint that the twinned laths come from{112}<111>deformation twins and show insignificant hardening,we demonstrate that they are actually originated from the twinned Kurdjumov Sachs(KS)variants and can give rise to 3–4 times hardening up to~420 HV(~130 HV for the starting sample).The underlying mechanisms responsible for the propensity for twinned variants and the carbon-independent hardening for Fe–Ni system were discussed.
文摘Objective To establish a 3D atlas of the lenticular nuclei and its subnucleus with the cryosection images of the male from "Atlas of Chinese Visible Human". Methods The lenticular nuclei and its subnucleus were segmented from the cryosection images and reconstructed with the software
文摘Objective: To assess the efficacy of hepatic lenticular degeneration (HLD) relief decoction in treating HLD. Methods: Intelligence quotient (IQ) of 28 (HLD) patients was analysed with Wechsler Adult Intelligence Scale-revised by China (WAIS-RC) before and after treatment by the HLD-Relief decoction supplemented with copper-clearing drug, and the result was compared with that of 30 healthy persons for control. Results: The Vocable to (VIQ), Performance to (PIQ) and Full to (FIQ) of HLD patients were markedly lower than those of the control (P < 0. 005), especially in visual space disorder, which indicated that the copper ion depositing in patient's brain not only damaged neuronic motorial functions but also produced a marked effect on the patient's intelligence. After treatment, the intelligence levels including VIQ, PIQ and FIQ was raised, particularly in PIQ in which all scores were obviously increased (P < 0. 001 ). It was also shown that the damage of intelligence in HLD patients became more serious as the course of disease was prolonged and early treatment facilitated the to level to approach the normal criterion. Conclusion: The combined treatment is effective to the recovery of intelligence and extrapyramidal symptoms in HLD patients.
基金financially supported by the Ministry of Science and Technology of China(2018YFA0704802,2017YFA0204502)the National Natural Science Foundation of China(21873105)。
文摘Lenticular printing technique provides a promising way to realize stereoscopic displays,especially,when microscopic optical structures are integrated into light-emitting materials/devices.Here,we fabricated large-area periodic structures with a spatial resolution at a wavelength scale from hybrid perovskite materials via a space-confined solution growth method.It takes advantages of both high refractive index contrast and high luminescence brightness,which allows the optical modulation on not only the reflection of illumination,but also the light emission from hybrid perovskites.The distributed feedback within these periodic structures significantly improves the degree of polarization and directionality of laser actions while their threshold is also reduced.These findings enable us to present a prototype of lenticular printing laser displays that vary emission colors at different view angles,which may find applications in creating high-resolution and high-contrast holographical images.
基金supported by the National Natural Science Foundation of China(NSFC,grant No.11988101)the K.C.Wong Education Foundation.
文摘As an alternative gravitational theory to general relativity(GR),conformal gravity(CG)has recently been successfully veri/ed by observations of type Ia supernovae(SN Ia)and the rotation curves of spiral galaxies.The observations of galaxies only pertain to the non-relativistic form of gravity.In this context,within the framework of the Newtonian theory of gravity(the non-relativistic form of GR),dark matter(DM)is postulated to account for the observations.On the other hand,the non-relativistic form of CG predicts an additional potential:besides the Newtonian potential,there is a so-called linear potential term,characterized by the parameterγ*,as an alternative to DM in Newtonian gravity.To test CG in its non-relativistic form,much work has been done by/tting the predictions to the observations of circular velocity(rotation curves)for spiral galaxies.In this paper,we test CG with the observations from elliptical galaxies.Instead of the circular velocities for spiral galaxies,we use the velocity dispersion for elliptical galaxies.By replacing the Newtonian potential with that predicted by the nonrelativistic form of CG in the Hamiltonian,we directly extend the Jeans equation derived in Newtonian theory to that for CG.By comparing the results derived from the ellipticals with those from spirals,we/nd that the extra potential predicted by CG is not suf/cient to account for the observations of ellipticals.Furthermore,we discover a strong correlation betweenγ*and the stellar mass M*in dwarf spheroidal galaxies.This/nding implies that the variation inγ*violates a fundamental prediction of CG,which posits thatγ*should be a universal constant.
