Light field 3D display technology is considered a revolutionary technology to address the critical visual fatigue issues in the existing 3D displays.Tabletop light field 3D display provides a brand-new display form th...Light field 3D display technology is considered a revolutionary technology to address the critical visual fatigue issues in the existing 3D displays.Tabletop light field 3D display provides a brand-new display form that satisfies multi-user shared viewing and collaborative works,and it is poised to become a potential alternative to the traditional wall and portable display forms.However,a large radial viewing angle and correct radial perspective and parallax are still out of reach for most current tabletop light field 3D displays due to the limited amount of spatial information.To address the viewing angle and perspective issues,a novel integral imaging-based tabletop light field 3D display with a simple flat-panel structure is proposed and developed by applying a compound lens array,two spliced 8K liquid crystal display panels,and a light shaping diffuser screen.The compound lens array is designed to be composed of multiple three-piece compound lens units by employing a reverse design scheme,which greatly extends the radial viewing angle in the case of a limited amount of spatial information and balances other important 3D display parameters.The proposed display has a radial viewing angle of 68.7°in a large display size of 43.5 inches,which is larger than the conventional tabletop light field 3D displays.The radial perspective and parallax are correct,and high-resolution 3D images can be reproduced in large radial viewing positions.We envision that this proposed display opens up possibility for redefining the display forms of consumer electronics.展开更多
Tabletop integral imaging display with a more realistic and immersive experience has always been a hot spot in three-dimensional imaging technology,widely used in biomedical imaging and visualization to enhance medica...Tabletop integral imaging display with a more realistic and immersive experience has always been a hot spot in three-dimensional imaging technology,widely used in biomedical imaging and visualization to enhance medical diagnosis.However,the traditional structural characteristics of integral imaging display inevitably introduce the flipping effect outside the effective viewing angle.Here,a full-parallax tabletop integral imaging display without the flipping effect based on space-multiplexed voxel screen and compound lens array is demonstrated,and two holographic functional screens with different parameters are optically designed and fabricated.To eliminate the flipping effect in the reconstruction process,the space-multiplexed voxel screen consisting of a projector array and the holographic functional screen is presented to constrain light beams passing through the corresponding lens.To greatly promote imaging quality within the viewing area,the aspherical structure of the compound lens is optimized to balance the aberrations.It cooperates with the holographic functional screen to modulate the light field spatial distribution.Compared with the simulation results,the distortion rate of the imaging display is reduced to less than 9%from more than 30%.In the experiment,the floating high-quality reconstructed three-dimensional image without the flipping effect can be observed with the correct 3D perception at 96°×96°viewing angle,where 44,100 viewpoints are employed.展开更多
PAD(presentation,assimilation and discussion) and flipped classroom mix the advantages of PAD and flipped classroom,PADand flipped classroom separate the period of a teacher's teaching and students' interactio...PAD(presentation,assimilation and discussion) and flipped classroom mix the advantages of PAD and flipped classroom,PADand flipped classroom separate the period of a teacher's teaching and students' interaction,allowing students to assimilate the knowl-edge they learned in one week,this teaching mode considers different groups of students.A result of a recent teaching experiment showsthat this teaching mode can allocate class time more efficiently and equally to each student to practise oral English.Students are moreconfident,more willing to participate and show more interest in oral class.展开更多
This paper is a tentative application of the foreign pedagogical theories into the evaluation of the Chinese mainstream college English textbook Viewing, Listening and Speaking(New Horizon College English, 2ndedition)...This paper is a tentative application of the foreign pedagogical theories into the evaluation of the Chinese mainstream college English textbook Viewing, Listening and Speaking(New Horizon College English, 2ndedition). Targeting the present imperfection, the paper also proposes respective suggestions for the further improvement of the coursebook.展开更多
AIM:To compare the effects of scleral buckling using wide-angle viewing systems(WAVS) with that using indirect ophthalmoscope for the treatment of rhegmatogenous retinal detachment.METHODS:The study was a retrospectiv...AIM:To compare the effects of scleral buckling using wide-angle viewing systems(WAVS) with that using indirect ophthalmoscope for the treatment of rhegmatogenous retinal detachment.METHODS:The study was a retrospective analyses of the medical records of 94 eyes(94 patients) with rhegmatogenous retinal detachment.Among them,47 eyes underwent scleral buckling using WAVS with endoiiluminator(Group W),and 47 eyes underwent scleral buckling using indirect ophthalmoscope(Group I).Surgical durations,primary success rate,best-corrected visual acuities(BCVA),delayed subretinal fluid absorptions and surgical complications were compared between the two groups.RESULTS:At baseline,there were no statistical differences between the two groups in patient's age(P=0.997),gender(P=0.853),symptom duration(P=0.216),BCVA(P=0.389),refractive error(P=0.167),intraocular pressure(P=0.595),the number of retinal breaks(P=0.832),the extent of retinal detachment(P =0.246),subretinal demarcation line(P=0.801),and macular detachment(P=0.811).The follow-up period was 12 mo.The surgical durations in Group W(with or without encircling buckling) were significant shorter than those in Group I(P<0.001 respectively).The primary success rate was94.27%in Group W,which was similar to that in Group I(92.38%,P=0.931).The BCVA in Group W was better than that in Group I(P<0.001) at 1-month follow-up visit.However,there were no significant differences between the two groups at 3-month(P=0.221),6-month(P =0.674),and 12-month(P=0.363) follow-up visits respectively.Delayed subretinal fluid absorptions were more common in Group I than in Group W at 1-month(P=0.045) follow-up visit,but there were no significant differences between the two groups at 3-month(P=0.111),6-month(P =1.000) and 12-month follow-up visits respectively.CONCLUSION:Scleral buckling using WAVS can be an alternative choose for rhegmatogenous retinal展开更多
AIM: To assess the optimal conditions for preventing condensation of objective lens during vitrectomy with noncontact wide-angle viewing systems(WAVSs). METHODS: We explored the effectiveness of the coating with ophth...AIM: To assess the optimal conditions for preventing condensation of objective lens during vitrectomy with noncontact wide-angle viewing systems(WAVSs). METHODS: We explored the effectiveness of the coating with ophthalmic viscoelastic device(OVDs) on the corneal surface and the soaking the objective lens in warm-saline for preventing condensation of objective lens. First, to find the optimal soaking time to keep the objective lens warm, we measured the temperature of objective lens every minute after soaking in warm saline. Second, to find optimal distance between cornea and objective lens, which provide as wide a view as possible and less condensation at the same time, we measured the condensation time with different distances. With the obtained optimal soaking time and distance, we explored the effect of coating cornea with OVDs and soaking objective lens in warm saline on condensation time.RESULTS: One and 5 min of soaking in warm saline was most effective for keeping the lens warm enough(45.1℃±2.1℃ for 1 min and 46.4℃±1.0℃ for 5 min, P=0.109). The mean condensation times for the control group at 1, 3, and 5 mm from corneal surface to objective lens were 1±0.4, 4±1.4, 190±26.1 s, respectively, thus 5 mm was most optimal distance for vitrectomy with WAVSs. For the OVD coating group, the mean condensation times were 1.5±0.3, 13±1.4, and 200±23.9 s at 1, 3, and 5 mm distance and borderline significant compared with control group(P=0.068, 0.051, and 0.063, respectively). With the 1-minute warm saline soaking group, the mean condensation time were extended to 188±34.4, 416±65.7, and 600±121.3 s at 1, 3, and 5 mm distance and statistically significant compared with control(P=0.043, 0.041 and 0.043, respectively).CONCLUSION: OVD coating on corneal surface shows no difference on condensation time with control group. However, soaking the objective lens in warm saline revealed statistically significant extension of condensation time compared to control group. Therefore, keeping the objective lens warm with soaking in warm saline is a simple but effective to prevent condensation of objective lens during vitrectomy. The thermodynamics between objective lens and cornea during vitrectomy warrants further investigation.展开更多
Compared with world’s other great powers, the United States deserves to be called a state that has both the desire and capability to rebuild the world. Therefore, its global strategy has become very important , and a...Compared with world’s other great powers, the United States deserves to be called a state that has both the desire and capability to rebuild the world. Therefore, its global strategy has become very important , and any nation that has dealings with Washington must take this into consideration. However, it is much debatable whether the United States has a global strategy, and whether a new global strategy展开更多
The words like "Hashimoto Politics" and "Obuchi Politics" are seldom heard since the 1990s. But changes in political and economic areas demonstrate that the existence of "Koizumi Politics"...The words like "Hashimoto Politics" and "Obuchi Politics" are seldom heard since the 1990s. But changes in political and economic areas demonstrate that the existence of "Koizumi Politics" and its impact can be felt indeed in the past couple of years. It is hard to tell whether Koizumi could successfully promote economic reform and pep up the long-depressed economy. However, Koizumi has launched a展开更多
Background/Aims: We investigated the relationship between ocular dominance and accommodation on the pupils of the dominant eye and the non-dominant eye under binocular open viewing conditions. Methods: Seventeen healt...Background/Aims: We investigated the relationship between ocular dominance and accommodation on the pupils of the dominant eye and the non-dominant eye under binocular open viewing conditions. Methods: Seventeen healthy young volunteers participated in this study. The dominant eye was determined using the hole-in-the-card test. The objective refraction and pupil diameter were measured under binocular open viewing and monocular single viewing conditions using a binocular open auto-refractor, the WAM-5500 (SHIGIYA MACHINERY WORKS LTD., Hiroshima, Japan). The accommodative response was calculated using the objective refraction, and the rate of miosis was calculated using the pupil diameter. These values were then compared between the dominant and the non-dominant eyes. Results: Under binocular open viewing conditions, the accommodative response in the dominant eye was greater than in the non-dominant eye (p = 0.001). In contrast, under monocular single viewing conditions, there were no differences in the accommodative response between the dominant and non-dominant eyes. In both binocular open viewing and monocular single viewing conditions, there were no differences in the miosis ratio between the dominant and non-dominant eyes. Conclusion: These results suggest that the accommodative response under binocular open viewing conditions is influenced by ocular dominance.展开更多
After the U.S. House of Representatives approved China’s permanent normaltrade relations(PNTR) bill on May 24by a vote of 237-197, the Senate finallypassed the bill overwhelmingly on September 19 by a vote of 83-15, ...After the U.S. House of Representatives approved China’s permanent normaltrade relations(PNTR) bill on May 24by a vote of 237-197, the Senate finallypassed the bill overwhelmingly on September 19 by a vote of 83-15, and PresidentBill Clinton signed it into law on October 10, terminating the U. S. practice of re-viewing China’s "most-favored-nation(MFN)" status on an annual basis in thepast 20 years. It is a great event with profound meanings in China-U. S. relations.展开更多
On March 24, 1999, depending on its advanced technology and weapons, theS-led North Atlantic Treaty Organization(NATO) circumvented the Unit-ed Nations and brazenly used military forces against the Republic of Yugosla...On March 24, 1999, depending on its advanced technology and weapons, theS-led North Atlantic Treaty Organization(NATO) circumvented the Unit-ed Nations and brazenly used military forces against the Republic of Yugoslavia.The continuous bombing for more than two months has brought unprecedentedcatastrophe to Yugoslavia which used to be called the Garden of Eden. On May8, NATO with the US as leader again violated the UN Charter, internationallaws and the Vienna Diplomatic Convention and flagrantly bombed the展开更多
Nowadays,several studies demonstrate that viewing nature has positive effects on human health and well-being.This essay discusses about the essential methods of viewing natural environment and their impacts on human w...Nowadays,several studies demonstrate that viewing nature has positive effects on human health and well-being.This essay discusses about the essential methods of viewing natural environment and their impacts on human well-being by clarifying four important theoretical models:reducing stress,lowering heart rate,improving outcome of surgery,and increasing attention.In addition,some important research results in this field are taken as examples to introduce research methods.By collecting and organizing existing studies and theories about the relationship between viewing nature and human well-being,the methods of viewing nature can be divided into two parts:viewing nature through specific media(e.g.,through a window,a book,a painting or a videotape)and being with the presence of nature.This study aims to clarify the research significance of viewing nature and find deficiency in this field to maximize the role of landscapes in human health and well-being.展开更多
基金We are grateful for financial supports from National Key R&D Program of China(Grant No.2021YFB2802300)the National Natural Science Foundation of China(Grant Nos.62105014,62105016,and 62020106010)。
文摘Light field 3D display technology is considered a revolutionary technology to address the critical visual fatigue issues in the existing 3D displays.Tabletop light field 3D display provides a brand-new display form that satisfies multi-user shared viewing and collaborative works,and it is poised to become a potential alternative to the traditional wall and portable display forms.However,a large radial viewing angle and correct radial perspective and parallax are still out of reach for most current tabletop light field 3D displays due to the limited amount of spatial information.To address the viewing angle and perspective issues,a novel integral imaging-based tabletop light field 3D display with a simple flat-panel structure is proposed and developed by applying a compound lens array,two spliced 8K liquid crystal display panels,and a light shaping diffuser screen.The compound lens array is designed to be composed of multiple three-piece compound lens units by employing a reverse design scheme,which greatly extends the radial viewing angle in the case of a limited amount of spatial information and balances other important 3D display parameters.The proposed display has a radial viewing angle of 68.7°in a large display size of 43.5 inches,which is larger than the conventional tabletop light field 3D displays.The radial perspective and parallax are correct,and high-resolution 3D images can be reproduced in large radial viewing positions.We envision that this proposed display opens up possibility for redefining the display forms of consumer electronics.
基金The Basic Research Fund of Central-Level Nonprofit Scientific Research Institutes(No.TKS20220304)The Key Research and Development Projects of Guangxi Science and Technology Department(No.2021AB05087).
文摘Tabletop integral imaging display with a more realistic and immersive experience has always been a hot spot in three-dimensional imaging technology,widely used in biomedical imaging and visualization to enhance medical diagnosis.However,the traditional structural characteristics of integral imaging display inevitably introduce the flipping effect outside the effective viewing angle.Here,a full-parallax tabletop integral imaging display without the flipping effect based on space-multiplexed voxel screen and compound lens array is demonstrated,and two holographic functional screens with different parameters are optically designed and fabricated.To eliminate the flipping effect in the reconstruction process,the space-multiplexed voxel screen consisting of a projector array and the holographic functional screen is presented to constrain light beams passing through the corresponding lens.To greatly promote imaging quality within the viewing area,the aspherical structure of the compound lens is optimized to balance the aberrations.It cooperates with the holographic functional screen to modulate the light field spatial distribution.Compared with the simulation results,the distortion rate of the imaging display is reduced to less than 9%from more than 30%.In the experiment,the floating high-quality reconstructed three-dimensional image without the flipping effect can be observed with the correct 3D perception at 96°×96°viewing angle,where 44,100 viewpoints are employed.
文摘PAD(presentation,assimilation and discussion) and flipped classroom mix the advantages of PAD and flipped classroom,PADand flipped classroom separate the period of a teacher's teaching and students' interaction,allowing students to assimilate the knowl-edge they learned in one week,this teaching mode considers different groups of students.A result of a recent teaching experiment showsthat this teaching mode can allocate class time more efficiently and equally to each student to practise oral English.Students are moreconfident,more willing to participate and show more interest in oral class.
文摘This paper is a tentative application of the foreign pedagogical theories into the evaluation of the Chinese mainstream college English textbook Viewing, Listening and Speaking(New Horizon College English, 2ndedition). Targeting the present imperfection, the paper also proposes respective suggestions for the further improvement of the coursebook.
基金Supported by the Projects of Henan Health and Family Planning Commission(No.2014005)Henan Health Department(No.201304007)Henan Science and Technology Department(No.142102310110)
文摘AIM:To compare the effects of scleral buckling using wide-angle viewing systems(WAVS) with that using indirect ophthalmoscope for the treatment of rhegmatogenous retinal detachment.METHODS:The study was a retrospective analyses of the medical records of 94 eyes(94 patients) with rhegmatogenous retinal detachment.Among them,47 eyes underwent scleral buckling using WAVS with endoiiluminator(Group W),and 47 eyes underwent scleral buckling using indirect ophthalmoscope(Group I).Surgical durations,primary success rate,best-corrected visual acuities(BCVA),delayed subretinal fluid absorptions and surgical complications were compared between the two groups.RESULTS:At baseline,there were no statistical differences between the two groups in patient's age(P=0.997),gender(P=0.853),symptom duration(P=0.216),BCVA(P=0.389),refractive error(P=0.167),intraocular pressure(P=0.595),the number of retinal breaks(P=0.832),the extent of retinal detachment(P =0.246),subretinal demarcation line(P=0.801),and macular detachment(P=0.811).The follow-up period was 12 mo.The surgical durations in Group W(with or without encircling buckling) were significant shorter than those in Group I(P<0.001 respectively).The primary success rate was94.27%in Group W,which was similar to that in Group I(92.38%,P=0.931).The BCVA in Group W was better than that in Group I(P<0.001) at 1-month follow-up visit.However,there were no significant differences between the two groups at 3-month(P=0.221),6-month(P =0.674),and 12-month(P=0.363) follow-up visits respectively.Delayed subretinal fluid absorptions were more common in Group I than in Group W at 1-month(P=0.045) follow-up visit,but there were no significant differences between the two groups at 3-month(P=0.111),6-month(P =1.000) and 12-month follow-up visits respectively.CONCLUSION:Scleral buckling using WAVS can be an alternative choose for rhegmatogenous retinal
文摘AIM: To assess the optimal conditions for preventing condensation of objective lens during vitrectomy with noncontact wide-angle viewing systems(WAVSs). METHODS: We explored the effectiveness of the coating with ophthalmic viscoelastic device(OVDs) on the corneal surface and the soaking the objective lens in warm-saline for preventing condensation of objective lens. First, to find the optimal soaking time to keep the objective lens warm, we measured the temperature of objective lens every minute after soaking in warm saline. Second, to find optimal distance between cornea and objective lens, which provide as wide a view as possible and less condensation at the same time, we measured the condensation time with different distances. With the obtained optimal soaking time and distance, we explored the effect of coating cornea with OVDs and soaking objective lens in warm saline on condensation time.RESULTS: One and 5 min of soaking in warm saline was most effective for keeping the lens warm enough(45.1℃±2.1℃ for 1 min and 46.4℃±1.0℃ for 5 min, P=0.109). The mean condensation times for the control group at 1, 3, and 5 mm from corneal surface to objective lens were 1±0.4, 4±1.4, 190±26.1 s, respectively, thus 5 mm was most optimal distance for vitrectomy with WAVSs. For the OVD coating group, the mean condensation times were 1.5±0.3, 13±1.4, and 200±23.9 s at 1, 3, and 5 mm distance and borderline significant compared with control group(P=0.068, 0.051, and 0.063, respectively). With the 1-minute warm saline soaking group, the mean condensation time were extended to 188±34.4, 416±65.7, and 600±121.3 s at 1, 3, and 5 mm distance and statistically significant compared with control(P=0.043, 0.041 and 0.043, respectively).CONCLUSION: OVD coating on corneal surface shows no difference on condensation time with control group. However, soaking the objective lens in warm saline revealed statistically significant extension of condensation time compared to control group. Therefore, keeping the objective lens warm with soaking in warm saline is a simple but effective to prevent condensation of objective lens during vitrectomy. The thermodynamics between objective lens and cornea during vitrectomy warrants further investigation.
文摘Compared with world’s other great powers, the United States deserves to be called a state that has both the desire and capability to rebuild the world. Therefore, its global strategy has become very important , and any nation that has dealings with Washington must take this into consideration. However, it is much debatable whether the United States has a global strategy, and whether a new global strategy
文摘The words like "Hashimoto Politics" and "Obuchi Politics" are seldom heard since the 1990s. But changes in political and economic areas demonstrate that the existence of "Koizumi Politics" and its impact can be felt indeed in the past couple of years. It is hard to tell whether Koizumi could successfully promote economic reform and pep up the long-depressed economy. However, Koizumi has launched a
文摘Background/Aims: We investigated the relationship between ocular dominance and accommodation on the pupils of the dominant eye and the non-dominant eye under binocular open viewing conditions. Methods: Seventeen healthy young volunteers participated in this study. The dominant eye was determined using the hole-in-the-card test. The objective refraction and pupil diameter were measured under binocular open viewing and monocular single viewing conditions using a binocular open auto-refractor, the WAM-5500 (SHIGIYA MACHINERY WORKS LTD., Hiroshima, Japan). The accommodative response was calculated using the objective refraction, and the rate of miosis was calculated using the pupil diameter. These values were then compared between the dominant and the non-dominant eyes. Results: Under binocular open viewing conditions, the accommodative response in the dominant eye was greater than in the non-dominant eye (p = 0.001). In contrast, under monocular single viewing conditions, there were no differences in the accommodative response between the dominant and non-dominant eyes. In both binocular open viewing and monocular single viewing conditions, there were no differences in the miosis ratio between the dominant and non-dominant eyes. Conclusion: These results suggest that the accommodative response under binocular open viewing conditions is influenced by ocular dominance.
文摘After the U.S. House of Representatives approved China’s permanent normaltrade relations(PNTR) bill on May 24by a vote of 237-197, the Senate finallypassed the bill overwhelmingly on September 19 by a vote of 83-15, and PresidentBill Clinton signed it into law on October 10, terminating the U. S. practice of re-viewing China’s "most-favored-nation(MFN)" status on an annual basis in thepast 20 years. It is a great event with profound meanings in China-U. S. relations.
文摘On March 24, 1999, depending on its advanced technology and weapons, theS-led North Atlantic Treaty Organization(NATO) circumvented the Unit-ed Nations and brazenly used military forces against the Republic of Yugoslavia.The continuous bombing for more than two months has brought unprecedentedcatastrophe to Yugoslavia which used to be called the Garden of Eden. On May8, NATO with the US as leader again violated the UN Charter, internationallaws and the Vienna Diplomatic Convention and flagrantly bombed the
文摘Nowadays,several studies demonstrate that viewing nature has positive effects on human health and well-being.This essay discusses about the essential methods of viewing natural environment and their impacts on human well-being by clarifying four important theoretical models:reducing stress,lowering heart rate,improving outcome of surgery,and increasing attention.In addition,some important research results in this field are taken as examples to introduce research methods.By collecting and organizing existing studies and theories about the relationship between viewing nature and human well-being,the methods of viewing nature can be divided into two parts:viewing nature through specific media(e.g.,through a window,a book,a painting or a videotape)and being with the presence of nature.This study aims to clarify the research significance of viewing nature and find deficiency in this field to maximize the role of landscapes in human health and well-being.
