In order to realize infrared target tracking accurately under motion platform,and make up for the shortcoming of the nuclear density estimation based on gradation feature,an adaptive kalman-mean shift algorithm based ...In order to realize infrared target tracking accurately under motion platform,and make up for the shortcoming of the nuclear density estimation based on gradation feature,an adaptive kalman-mean shift algorithm based on multi-feature fusion is proposed.The target model based on edge-gradation feature fusion is applied in the mean shift algorithm.The starting position at present of an infrared target is predicted by a kalman filter,and then a scale updating item of tracking window is appended based on the relationship between mutual information and the object scale.Then the moving object,especially the object with a variable scale,is adaptively tracked under motion platform.Experimental results demonstrate that the adaptability of mean shift algorithm is enhanced by the improved scheme,which can be applied in the process of long time tracking for the object with a variable scale.展开更多
Purpose: To describe the association of demographic, behavioral, medical, and nonretinal ocular factors with the incidence of neovascular age-related macular degeneration (AMD) and central geographic atrophy (CGA) in ...Purpose: To describe the association of demographic, behavioral, medical, and nonretinal ocular factors with the incidence of neovascular age-related macular degeneration (AMD) and central geographic atrophy (CGA) in the Age-Related Eye Disease Study (AREDS), a randomized trial of antioxidants and zinc supplementat ion prophylaxis for development of advanced AMD. Design: Clinic-based prospecti ve cohort study. Participants: Of individuals with early or intermediate AMD at baseline with a median follow-up of 6.3 years, 788 were at risk of developing a dvanced AMD in one eye (the fellow eye had advanced AMD), and 2506 were at risk in both eyes. Methods: The incidence of neovascular AMD and CGA was assessed fro m stereoscopic color fundus photographs taken at baseline and at annual visits b eginning at year 2. Main Outcome Measures: Neovascular AMD was defined as photoc oagulation for choroidal neovascularization, or photographic documentation at th e reading center of any of the following: nondrusenoid retinal pigment epithelia l detachment, serous or hemorrhagic retinal detachment, hemorrhage under the ret ina or the retinal pigment epithelium, and subretinal fibrosis. Central geograph ic atrophy was defined as geographic atrophy involving the center of the macula. Results: In multivariable models, in persons at risk of advanced AMD in both ey es, while controlling for age, gender, and AREDS treatment group, the following variables were statistically significantly associated with the incidence of neov ascularAMD: race (odds ratio [OR], white vs. black, 6.77; 95%confidence inter va l [CI], 1.24-36.9) and larger amount smoked (OR, >10 vs. ≤10 pack-years [a pa ck-year is an average of 1 pack of cigarette smoked per day for a year], 1.55; 95%CI, 1.15-2.09). The following were statistically significantly associated w ith the incidence of CGA: less education (OR, high school graduate or less vs. c ollege graduate, 1.75; 95%CI, 1.10-2.78), greater body mass index (BMI) (OR, o bese vs. nonobese, 1.93; 95%CI, 1.25-2.65), larger amount smoked (OR, >10 pack -years vs. ≤10 pack-years, 1.82; 95%CI, 1.25-2.65), and antacid use (OR, 0. 29; 95%CI, 0.09-0.91). In persons at risk of developing advanced AMD in one ey e, the incidence of neovascular AMD was associated with diabetes (OR, 1.88; 95% CI, 1.07-3.31), and the incidence of CGA was associated with use of antiinflamm atorymedications (OR, 0.22; 95%CI, 0.08-0.59). Conclusions: Results suggest th at, among persons with early or intermediate AMD, smoking and BMI are modifiable factors associated with progression to advanced AMD, and suggest other associat ions (e.g., use of antacids and antiinflammatory medications) that warrant furth er study.展开更多
Interfacial interactions between rough mineral particles have garnered considerable attention as they directly determine particle agglomeration and floatability.This study comprehensively investigates the agglomeratio...Interfacial interactions between rough mineral particles have garnered considerable attention as they directly determine particle agglomeration and floatability.This study comprehensively investigates the agglomeration characteristics of siderite particles after argon(Ar)plasma surface modification through settling tests,flocs size measurements,and fractal dimension calculations.Ar plasma surface modification promotes the agglomeration of siderite particles,as evidenced by increased floc size and density.The agglomeration mechanism induced by Ar plasma surface modification is evaluated using a theoretical model combining the surface element integration(SEI)approach,differential geometry,and the composite Simpson's rule.Changes in surface roughness,wettability,and charge are considered in this model.Compared to the unpretreated siderite particles,the energy barrier for interaction of the 30-min Ar plasma-pretreated siderite particles decreases from 2.3×10-^(17)J to 1.6×10^(-17)J.This reduction provides strong evidence for the agglomeration behavior of siderite particles.Furthermore,flotation experiments confirm that Ar plasma surface modification is conducive to the aggregation flotation of siderite.These findings offer crucial insights into particle aggregation and dispersion behaviors,with notable application in mineral flotation.展开更多
In order to study the role of the new technological concept of shared experiences in the digital interactive experience of cultural heritage and apply it to the digital interactive experience of cultural heritage to s...In order to study the role of the new technological concept of shared experiences in the digital interactive experience of cultural heritage and apply it to the digital interactive experience of cultural heritage to solve the current problems in this field,starting from the mixed reality(MR) technology that the shared experiences rely on,proper software and hardware platforms were investigated and selected,a universal shared experiences solution was designed,and an experimental project based on the proposed solution was made to verify its feasibility.In the end,a proven and workable shared experiences solution was obtained.This solution included a proposed MR spatial alignment method,and it integrated the existing MR content production process and standard network synchronization functions.Furthermore,it is concluded that the introduction and reasonable use of new technologies can help the development of the digital interactive experience of cultural heritage.The shared experiences solution for the digital interactive experience of cultural heritage balances investment issues in the exhibition,display effect,and user experience.It can speed up the promotion of cultural heritage and bring the vitality of MR technology to relevant projects.展开更多
We present the preparation and measurement of the radioactive isotope^(37)Ar,which was produced using thermal neutrons from a reactor,as a calibration source for liquid xenon time projection chambers.^(37)Ar is a low-...We present the preparation and measurement of the radioactive isotope^(37)Ar,which was produced using thermal neutrons from a reactor,as a calibration source for liquid xenon time projection chambers.^(37)Ar is a low-energy calibration source with a half-life of 35.01 days,making it suitable for calibration in the low-energy region of liquid xenon dark-matter experiments.Radioactive isotope^(37)Ar was produced by irradiating ^(36)Ar with thermal neutrons.It was subsequently measured in a gaseous xenon time projection chamber(GXe TPC)to validate its radioactivity.Our results demonstrate that^(37)Ar is an effective and viable calibration source that offers precise calibration capabilities in the low-energy domain of xenon-based detectors.展开更多
基金supported by the National Defense Research Fund of China (No.43511121B)
文摘In order to realize infrared target tracking accurately under motion platform,and make up for the shortcoming of the nuclear density estimation based on gradation feature,an adaptive kalman-mean shift algorithm based on multi-feature fusion is proposed.The target model based on edge-gradation feature fusion is applied in the mean shift algorithm.The starting position at present of an infrared target is predicted by a kalman filter,and then a scale updating item of tracking window is appended based on the relationship between mutual information and the object scale.Then the moving object,especially the object with a variable scale,is adaptively tracked under motion platform.Experimental results demonstrate that the adaptability of mean shift algorithm is enhanced by the improved scheme,which can be applied in the process of long time tracking for the object with a variable scale.
文摘Purpose: To describe the association of demographic, behavioral, medical, and nonretinal ocular factors with the incidence of neovascular age-related macular degeneration (AMD) and central geographic atrophy (CGA) in the Age-Related Eye Disease Study (AREDS), a randomized trial of antioxidants and zinc supplementat ion prophylaxis for development of advanced AMD. Design: Clinic-based prospecti ve cohort study. Participants: Of individuals with early or intermediate AMD at baseline with a median follow-up of 6.3 years, 788 were at risk of developing a dvanced AMD in one eye (the fellow eye had advanced AMD), and 2506 were at risk in both eyes. Methods: The incidence of neovascular AMD and CGA was assessed fro m stereoscopic color fundus photographs taken at baseline and at annual visits b eginning at year 2. Main Outcome Measures: Neovascular AMD was defined as photoc oagulation for choroidal neovascularization, or photographic documentation at th e reading center of any of the following: nondrusenoid retinal pigment epithelia l detachment, serous or hemorrhagic retinal detachment, hemorrhage under the ret ina or the retinal pigment epithelium, and subretinal fibrosis. Central geograph ic atrophy was defined as geographic atrophy involving the center of the macula. Results: In multivariable models, in persons at risk of advanced AMD in both ey es, while controlling for age, gender, and AREDS treatment group, the following variables were statistically significantly associated with the incidence of neov ascularAMD: race (odds ratio [OR], white vs. black, 6.77; 95%confidence inter va l [CI], 1.24-36.9) and larger amount smoked (OR, >10 vs. ≤10 pack-years [a pa ck-year is an average of 1 pack of cigarette smoked per day for a year], 1.55; 95%CI, 1.15-2.09). The following were statistically significantly associated w ith the incidence of CGA: less education (OR, high school graduate or less vs. c ollege graduate, 1.75; 95%CI, 1.10-2.78), greater body mass index (BMI) (OR, o bese vs. nonobese, 1.93; 95%CI, 1.25-2.65), larger amount smoked (OR, >10 pack -years vs. ≤10 pack-years, 1.82; 95%CI, 1.25-2.65), and antacid use (OR, 0. 29; 95%CI, 0.09-0.91). In persons at risk of developing advanced AMD in one ey e, the incidence of neovascular AMD was associated with diabetes (OR, 1.88; 95% CI, 1.07-3.31), and the incidence of CGA was associated with use of antiinflamm atorymedications (OR, 0.22; 95%CI, 0.08-0.59). Conclusions: Results suggest th at, among persons with early or intermediate AMD, smoking and BMI are modifiable factors associated with progression to advanced AMD, and suggest other associat ions (e.g., use of antacids and antiinflammatory medications) that warrant furth er study.
基金financially supported by the National Natural Science Foundation of China(No.52204284)the China Postdoctoral Science Foundation(No.2025MD784125)+2 种基金the Natural Science Foundation of Shaanxi Province,China(No.2024JC-YBQN-0365)the Shaanxi Province Postdoctoral Science Foundation,China(No.2025BSHSDZZ363)Outstanding Youth Science Fund of Xi’an University of Science and Technology,China(No.202308)。
文摘Interfacial interactions between rough mineral particles have garnered considerable attention as they directly determine particle agglomeration and floatability.This study comprehensively investigates the agglomeration characteristics of siderite particles after argon(Ar)plasma surface modification through settling tests,flocs size measurements,and fractal dimension calculations.Ar plasma surface modification promotes the agglomeration of siderite particles,as evidenced by increased floc size and density.The agglomeration mechanism induced by Ar plasma surface modification is evaluated using a theoretical model combining the surface element integration(SEI)approach,differential geometry,and the composite Simpson's rule.Changes in surface roughness,wettability,and charge are considered in this model.Compared to the unpretreated siderite particles,the energy barrier for interaction of the 30-min Ar plasma-pretreated siderite particles decreases from 2.3×10-^(17)J to 1.6×10^(-17)J.This reduction provides strong evidence for the agglomeration behavior of siderite particles.Furthermore,flotation experiments confirm that Ar plasma surface modification is conducive to the aggregation flotation of siderite.These findings offer crucial insights into particle aggregation and dispersion behaviors,with notable application in mineral flotation.
基金supported by the National Key Research and Development Program of China (2020YFF0305304)。
文摘In order to study the role of the new technological concept of shared experiences in the digital interactive experience of cultural heritage and apply it to the digital interactive experience of cultural heritage to solve the current problems in this field,starting from the mixed reality(MR) technology that the shared experiences rely on,proper software and hardware platforms were investigated and selected,a universal shared experiences solution was designed,and an experimental project based on the proposed solution was made to verify its feasibility.In the end,a proven and workable shared experiences solution was obtained.This solution included a proposed MR spatial alignment method,and it integrated the existing MR content production process and standard network synchronization functions.Furthermore,it is concluded that the introduction and reasonable use of new technologies can help the development of the digital interactive experience of cultural heritage.The shared experiences solution for the digital interactive experience of cultural heritage balances investment issues in the exhibition,display effect,and user experience.It can speed up the promotion of cultural heritage and bring the vitality of MR technology to relevant projects.
基金supported by National Key R&D grant from the Ministry of Science and Technology of China(Nos.2021YFA1601600,2023YFA1606200)National Science Foundation of China(Nos.12090062,12105008)the Major State Basic Research Development Program of China.
文摘We present the preparation and measurement of the radioactive isotope^(37)Ar,which was produced using thermal neutrons from a reactor,as a calibration source for liquid xenon time projection chambers.^(37)Ar is a low-energy calibration source with a half-life of 35.01 days,making it suitable for calibration in the low-energy region of liquid xenon dark-matter experiments.Radioactive isotope^(37)Ar was produced by irradiating ^(36)Ar with thermal neutrons.It was subsequently measured in a gaseous xenon time projection chamber(GXe TPC)to validate its radioactivity.Our results demonstrate that^(37)Ar is an effective and viable calibration source that offers precise calibration capabilities in the low-energy domain of xenon-based detectors.
