2023
2023
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Record 265 of
Title:Coastal Zone Extraction Algorithm Based on Multilayer Depth Features for Hyperspectral Images
Author(s):Qiu, Shi(1); Ye, Huping(2,3); Liao, Xiaohan(3,4)Source: IEEE Transactions on Geoscience and Remote Sensing Volume: 61 Issue: null Article Number: 5527315 DOI: 10.1109/TGRS.2023.3321478 Published: 2023Abstract:The coastal zone is the most active natural area on the Earth's surface and has the most favorable resources and environmental conditions. Therefore, it is of great significance to conduct research based on the coastal zone. Hyperspectral remote sensing images have spatial and spectral dimensions that reflect the spatial distribution and can analyze the compositional information, which has been widely used for feature analysis and observation of ground objects. In this article, we propose a coastal zone extraction algorithm based on multilayer depth features for hyperspectral images (HSIs). The main contributions are as follows: 1) the Huanjing satellite hyperspectral coastal zone database is built for the first time, image composition is analyzed, and the noise removal algorithm is yielded; 2) 3-D attention networks that are capable of carrying spatial and interspectral information are proposed; and 3) A 3-D convolutional neural network (CNN) with squeeze and excitation network (SENet) tandem structure is proposed to fully exploit detailed information, and a multilayer feature extraction framework is built. We analyze four typical coastal zone patterns, and the experimental results show that our proposed algorithm can achieve coastal zone extraction with an average Kappa coefficient of 0.92, which is 0.06 higher than the mainstream algorithms. Our algorithm also shows good performance in complex environments. It provides a basis for further research on coastal zones. ? 1980-2012 IEEE.Accession Number: 20234314965971 -
Record 266 of
Title:Improvement of the sediment flux estimation in the Yangtze River Estuary with a GOCI data adjusted numerical model
Author(s):Xie, Guohu(1,2); Zhang, Yang(2,3); Liu, Jia(2,4,5); Xue, Huijie(6); Ge, Jianzhong(7); He, Xianqiang(2); Ma, Wentao(3); Chai, Fei(1,6)Source: Ocean Modelling Volume: 186 Issue: null Article Number: 102284 DOI: 10.1016/j.ocemod.2023.102284 Published: December 2023Abstract:Sediment flux (SF) in the estuary is vital to the coastal and estuarine environment, especially the morphodynamical and ecological processes. However, its quantitative estimation with high accuracy is difficult because it is controlled by complex mechanisms and multiple processes. This study corrects the seasonal variations of the simulated suspended sediment concentration (SSC) by using GOCI-derived surface SSC and calculates the variations of SFs at the main cross-sections in and out of the Yangtze River Estuary (YRE). The results show that in 2013, 159 Mt and 143 Mt of sediments passed through Xuliujing hydrological station in YRE and estuarine mouth section, respectively. In the inner estuary, the significant seasonal variations of sediment transport are noted that the most seaward transport happens in summer (43.8%) and the least occurs in winter (7.3%). In the outer estuary, the southward transport towards Hangzhou Bay is the most critical pathway, accounting for 109.0% of total transport at mouth section, and is prevalent in autumn and winter. With considerations of sand mining and land reclamation, obviously erosions appear in the whole estuary during both 2013 and 2015. With stronger wind conditions in 2013, severer erosion (161 Mt) happens in outer estuary than that in 2015 (86 Mt). By combining the GOCI-derived surface SSC and the numerical model results, this study can better represent high-frequency hydro- and sediment-dynamical processes to calculate the annual, seasonal, and vertical SFs with improved accuracy. Hence this method may provide a viable way to infer locally averaged morphological changes. ? 2023Accession Number: 20234515022076 -
Record 267 of
Title:Design of Large Aperture and Large Field of View Receiving Optical System Based on Catadioptric System
Author(s):Chao, Li(1,2); Yingjun, Ma(1); Youhui, Huo(1,3); Weining, Chen(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 12559 Issue: null Article Number: 125590E DOI: 10.1117/12.2651842 Published: 2023Abstract:The structure of the initial system is calculated according to the aberration theory, in which the radius of the primary mirror is 300 mm, the radius of the secondary mirror is 320 mm, the distance between the primary mirror and the secondary mirror is 90 mm, and the blocking ratio is close to 0.4, and the occlusion ratio is close to 0.4. A three-piece correction lens set is designed to solve the spherical aberration and comet aberration caused by the Cassegrain system in the large field of view, and the imaging of the edge field of view of the large field of view system is realized. Through the optimization and layout of the overall system, the MTF value of the system is finally greater than 0.4 within the frequency of 130 lp/mm. This paper provides important reference value for the design of catadioptric optical system with large aperture and large field of view. ? 2023 SPIE.Accession Number: 20230613559817 -
Record 268 of
Title:Machine-Learning Enabled Optimization for Robust Soliton Crystal Generation in Microring Resonators
Author(s):Mazoukh, C.(1); Di Lauro, L.(1); Fischer, B.(1); Aadhi, A.(1); Alamgir, I.(1); Eshaghi, A.(2); Little, B.E.(3); Chu, S.T.(4); Moss, D.J.(5); Morandotti, R.(1,6)Source: 2023 Conference on Lasers and Electro-Optics, CLEO 2023 Volume: null Issue: null Article Number: JTu2A.91 DOI: null Published: 2023Abstract:We illustrate a novel strategy to robustly generate soliton states in Hydex microring resonators pumped with a continuous-wave laser source, by employing genetic algorithms to optimize the parameters required for coherent state generation. ? Optica Publishing Group 2023 ? 2023 The Author(s)Accession Number: 20234615064619 -
Record 269 of
Title:Development of functional, sustainable pullulan-sodium alginate-based films by incorporating essential oil microemulsion for chilled pork preservation
Author(s):Wei, Ze(1); Huang, Lingli(1); Feng, Xinyu(1); Cui, Feng(2); Wu, Ruijie(3); Kong, Qingjun(4); Sun, Keyu(1); Gao, Jianhua(5); Guo, Jun(1)Source: International Journal of Biological Macromolecules Volume: 253 Issue: null Article Number: 127257 DOI: 10.1016/j.ijbiomac.2023.127257 Published: December 31, 2023Abstract:Developing safe, eco-friendly, and functionally edible packaging materials has attracted global attention. Essential oils, can be incorporated into packaging materials as antioxidant and antibacterial agents. However, their high volatility and discontinuous film matrix issues may cause a rough film surface, limiting the application in food packaging. In this study, thyme essential oil microemulsion (TEO-M) was prepared and incorporated into a pullulan-sodium alginate (PS) film. The TEO-M incorporation endowed the PS film with antioxidant and UV protection properties. The antioxidant activities of the TEO-M-incorporated PS film were significantly better than those of the TEO-C (thyme essential oil coarse emulsion)-incorporated PS film. In comparison to TEO-C, the distribution of TEO-M in the film is more uniform. Lipid oxidation and the growth of microorganisms in chilled pork were inhibited by incorporating TEO-M at a concentration of 50 mg/mL in the PS film (PS-50M). After 10 days of storage at 4 °C, the total viable count (TVC) of chilled pork preserved in the PS-50M material was significantly reduced compared to the control group (P ? 2023 Elsevier B.V.Accession Number: 20234114870164 -
Record 270 of
Title:An Overview of Spaceborne Atmospheric Wind Field Measurement with Passive Optical Remote Sensing
Author(s):Feng, Yutao(1); Fu, Di(1,2); Zhao, Zengliang(3); Zong, Weiguo(4); Yu, Tao(5); Sheng, Zheng(6); Zhu, Yajun(7)Source: Guangxue Xuebao/Acta Optica Sinica Volume: 43 Issue: 6 Article Number: 0601011 DOI: 10.3788/AOS221462 Published: March 2023Abstract:Significance Wind field is an important parameter characterizing the dynamic characteristics of the earth's atmospheric system, and it serves as basic data necessary for business work and scientific research in fields such as weather forecasting, space weather, and climatology. The wind field measurement based on satellite remote sensing is not limited by geographical conditions. It can determine the intensity and direction information of the atmospheric wind field at different altitudes by monitoring the motion state of ocean waves, clouds, aerosols, and atmospheric components. It can not only obtain the observation data of ocean, desert, and polar regions, which are difficult to be collected by conventional methods, but also obtain the profile information of the wind field along the height distribution. As one of the main techniques in atmospheric wind field measurement, passive optical remote sensing has the characteristics of high accuracy, large altitude coverage, and small resource occupation. Great progress in the past half century has been made, and various wind measurement technologies have been developed such as atmospheric motion vectors, infrared hyperspectral analysis of water vapor, wind imaging interferometer, and Doppler modulated gas correlation, which can realize wind field measurement in an altitude ranging from 1 km near the surface to 300-400 km and form a reliable verification and capability complementation with active wind field measurement technologies such as lidar and microwave. In order to promote the development of spaceborne passive optical remote sensing for measuring atmospheric wind fields, it is necessary to summarize and discuss the existing research progress and future development trends, so as to provide a reference for the development of future passive optical remote sensing detection technology for atmospheric wind field and the task planning in atmospheric wind field detection. Progress This review focuses on two types of spaceborne optical passive techniques for wind field measurement based on atmospheric motion vector monitoring and atmospheric spectral Doppler shift detection. The fundamental theories, basic inversion methods, and the progress of research and application of representative payloads of various passive wind field detection technologies are summarized (Table 4). The atmospheric motion vector detection technology relies on cloud map observation to realize wind field detection. It has the characteristics of high spatial resolution and high detection accuracy and can obtain meter-level and precise wind field data at a sub-kilometer scale. However, limited by its detection technology mechanism, its detection altitude and efficiency are also significantly restricted. Infrared hyperspectral wind field measurement technology is based on infrared images of specific water vapor spectral channels and profile data to track the movement of characteristic image targets at specific altitudes to invert atmospheric wind speed, which is used for troposphere wind measurement, with high vertical resolution and profile data, and it is less affected by the cloud. Compared with those of the cloud-derived motion vector (CMV) technology, its measurement accuracy and horizontal spatial resolution of wind speed and direction need to be improved. However, as infrared hyperspectral loading and wind field inversion algorithms develop, infrared hyperspectral wind field measurement technology will become an important technology for troposphere wind. The wind field interferometer obtains the interferogram of the fine atmospheric spectrum from the limb observation, inverts the Doppler frequency shift of the atmospheric spectrum through the intensity position or phase change in the interferogram, and then realizes the measurement of the atmospheric wind field. The spaceborne application of this technology began in the late 1960s, and three technical systems have been developed, namely, Michelson interferometer, Fabry-Pérot interferometer, and Doppler asymmetric spatial heterodyne interferometer. The detection altitude covers most of the atmosphere including the stratosphere, mesosphere, and thermosphere. It features continuous profile detection capability, vertical resolution with an order of kilometers, and horizontal spatial resolution with an order of 100 km, and the highest peak accuracy of wind speed measurement has reached 3 m/s. The Doppler modulated gas correlation technology modulates and filters the incident spectrum through a molecular filter with its composition the same as the target atmospheric composition, so as to realize the frequency shift detection of the atmospheric spectrum and the detection of the wind. Compared with traditional spaceborne wind field measurement technologies, it has the advantages of high horizontal resolution, small size, light weight, and low power consumption and has a good application prospect in the field of small satellite network observation. At present, the technology is still in the stage of technical verification and application testing, and it is expected to further improve the vertical resolution of the limb observation, but the space for improving the effective horizontal resolution is limited. Conclusions and Prospects Through the technical research and payload application in the past 20 to 30 years, China's spaceborne passive optical atmospheric wind field detection technology is gradually narrowing the gap with the international leading level. However, in general, the spaceborne atmospheric wind field detection capability based on passive optical remote sensing still has problems such as discontinuous altitude profile coverage, incomplete local coverage of middle and high level wind field data, and limited spatial resolution of high level wind field data. In the future, the accuracy and resolution of profile data products for tropospheric wind field elements should be improved, and the gaps in China's middle and upper level atmospheric wind field observation data in terms of global scale should be filled. In addition, As China's planetary scientific research and deep-space exploration plans develop, the wind field detection for the atmospheres of Mars, Jupiter, and other planets is also an important direction for the development of wind measurement technology based on passive optical remote sensing. ? 2023 Chinese Optical Society. All rights reserved.Accession Number: 20231914072408 -
Record 271 of
Title:ULTRA BROADBAND COHERENT DIFFRACTIVE IMAGING A FAST MONOCHROMATIZATION METHOD
Author(s):Li, Boyang(1)Source: arXiv Volume: null Issue: null Article Number: null DOI: 10.48550/arXiv.2302.08898 Published: January 11, 2023Abstract:Coherent diffractive imaging (CDI) as a lensless imaging technique, has been applied in a wide range of sciences. However it is not compatible with short pulse lasers, because it is limited with monochromatic illumination. Although there have been reports on the broadband CDI, the bandwidth is limited with 10% for robust imaging. In this article, we report a algorithm which is able to CDI robustly with at least 80% bandwidth. This algorithm is apply to published experiment data and simulated ultra-broadband data to demonstrate its ability. This technique enables us to capture the non-repeatable transient dynamics as short as the laser pulse width, which is one step forward to the ultrafast CDI. Copyright ? 2023, The Authors. All rights reserved.Accession Number: 20230066265 -
Record 272 of
Title:Modular registration and performance evaluation of the digital twin
Author(s):Chou, Xiaoquan(1); Li, Xiaoyan(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 12921 Issue: null Article Number: 129214Z DOI: 10.1117/12.2691935 Published: 2023Abstract:Complex optical systems are composed of multiple subsystem modules, and high-precision registration between modules is the key to ensuring the overall performance indicators of optical systems. The registration between submodules in the engineering optical system is divided into two aspects: spatial geometric coordination and optical feature registration. The relationship between spatial geometric alignment and optical feature registration is introduced, and the spatial geometric registration between subsystems is the linear relationship. The subsystem model is established using data matrix, and the subsystem data matrix and physical entities are mapped to each other to form the digital twin. The registration between subsystems with each other applies matrix changes to establish the mathematical model, and each subsystem forms a large complex engineering optical system through registration. The error affecting the registration performance of the subsystem, the relationship between the registration error and the performance of the entire optical system, and the error data transfer between the physical entity and the digital matrix model were systematically analyzed, as well as the mathematical model and the entity registration scheme were optimized and corrected. ? 2023 SPIE.Accession Number: 20234815132717 -
Record 273 of
Title:Novel Sb2S3-xSex photocathode decorated NiFe-LDH hole blocking layer with enhanced photoelectrochemical performance
Author(s):Zhang, Liyuan(1); Xin, Chang(1); Jin, Wei(1); Sun, Qian(1); Wang, Yishan(2); Wang, Jiawei(3); Hu, Xiaoyun(1); Miao, Hui(1)Source: Applied Surface Science Volume: 639 Issue: null Article Number: 158184 DOI: 10.1016/j.apsusc.2023.158184 Published: December 1, 2023Abstract:The alloyed Sb2S3-xSex has attracted widespread attention as a promising light absorbing material in recent years because it has the advantages of both Sb2S3 and Sb2Se3, such as adjustable band gap in the range of 1.1–1.8 eV and good stability. However, expensive selenourea enormously increases its manufacturing cost. In this paper, using Se powder as Se source, high-quality and low-cost Sb2S3-xSex film photoelectrode is successfully prepared by one-step hydrothermal method, and applied to photoelectrochemical (PEC) water splitting. Furthermore, with the help of NiFe-layered double hydroxide (LDH) modification, an increase in photocurrent density from ?0.22 mA cm?2 to ?1.21 mA cm?2 at 0 VRHE is achieved, and the onset potential is positively shifted by 120 mV. NiFe-LDH significantly improve hydrogen evolution reaction (HER) performance. The relevant characterization can confirm that this is mainly due to the blocking effect of NiFe-LDH on photogenerated holes, promoting effect of Ni2+ on the kinetics of hydrogen evolution reactions, and the strengthening of bulk charge separation efficiency. Undoubtedly, this work opens up a simple and effective way for the development of low-cost, high-efficiency antimony chalcogenides photoelectrodes, and provides new ideas for its excellent application in the field of PEC water splitting. ? 2023 Elsevier B.V.Accession Number: 20233314547498 -
Record 274 of
Title:Research on sub-pixel shift based super-resolution imaging by introducing wave-front coding technique
Author(s):Zhao, Hui(1); Xue, Yukun(1,2); Yang, Mingyang(1); Li, Baopeng(1); Fan, Xuewu(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 12767 Issue: null Article Number: 127671D DOI: 10.1117/12.2687372 Published: 2023Abstract:By capturing a series of low-resolution images which have known or unknown sub-pixel displacement between each other, high resolution image could be reconstructed through algorithms such as IBP, POCS and so on. This technique mainly aims to solve the problem of aliasing effect caused by under-sampling but one problem exists. While applying sub-pixel shift based super-resolution reconstruction, point spread function is used to simulate the imaging process but usually the point spread function corresponding to the low-resolution imaging system is used, which does not match reconstruction in high-resolution grid. According to our previous researches, the wave-front coding technique could be used to realize single image amplification based super-resolution reconstruction because the point spread function corresponding to the high-resolution grid could be digitally generated in a more accurate way. In this manuscript, the rotationally symmetric wave-front coding technique and the sub-pixel shift based super-resolution imaging are combined together and there are two advantages. First, because of decrease of the magnitude of optical transfer function caused by wave-front coding, the aliasing effect in the intermediate images is reduced keeping pitch size unchanged. Second, while doing the reconstruction in high-resolution grid, the computed point spread function corresponding to the high-resolution grid is used, which better matches the high-resolution grid. The numerical results demonstrate that better image could be obtained by incorporating rotationally symmetric wave-front coding into sub-pixel shift based super-resolution imaging. ? 2023 SPIE. All rights reserved.Accession Number: 20235115264086 -
Record 275 of
Title:Research Progress on Ignition Technologies of Solid Energetic Materials
Author(s):Liu, He-Xin(1); Zhao, Feng-Qi(1); Qin, Zhao(1); Li, Hui(1); Ma, Hai-Xia(2); Jiang, Yi-Fan(1); Zhang, Chao(1); Yu, Xiang-Hua(3); Yao, Bao-Li(3)Source: Huozhayao Xuebao/Chinese Journal of Explosives and Propellants Volume: 46 Issue: 8 Article Number: null DOI: 10.14077/j.issn.1007-7812.202302009 Published: 2023Abstract:The six different ignition techniques based on the energy excitation types, including chemical energy ignition, light energy excitation, electromagnetic wave, high-pressure shock wave, electric energy excitation, and gas-solid flow and heat transfer, were systematically summarized and introduced in the paper. Specifically, the characteristics of the above-described ignition methods were shown, and their recent application and progress in the basic studies of solid energetic materials were also emphasized. In order to determine the appropriate ignition technology for the different energetic materials, it is necessary to comprehensively consider the technical characteristics such as complexity, stability, and integration difficulty for ignition systems, as well as ignition mechanism, heating rate, and accumulation state for solid energetic materials. Based on the basic research needs in terms of intrinsic mechanism and combustion control law, it is pointed out that the ignition technologies of solid energetic materials are developing in the direction of more safety, more reliablity, higher efficiency, accurate control of energy output and high integration of measuring devices. Future work should further strengthen the research on illustrating the intrinsic mechanism of ignition for single-particle energetic materials, improving the research systematism for various particle packing forms, and constructing control strategies of ignition characteristics. 112 References were attched. ? 2023 China Ordnance Industry Corporation. All rights reserved.Accession Number: 20234414994506 -
Record 276 of
Title:TiO2 spatially confined growth of Sb2(S,Se)3@TiO2 NT heterojunction photoanodes and their photoelectrochemical properties
Author(s):Jin, Wei(1); Liu, Dekang(1); Zhang, Liyuan(1); Sun, Qian(1); Wang, Yishan(2); Liu, Enzhou(3); Hu, Xiaoyun(1); Miao, Hui(1)Source: Catalysis Science and Technology Volume: 13 Issue: 24 Article Number: null DOI: 10.1039/d3cy01136d Published: October 23, 2023Abstract:Titanium dioxide (TiO2), a conventional n-type semiconductor, was widely used in photocatalysis, electrocatalysis and photoelectrocatalysis due to its good UV absorption and stable physical and chemical properties. However, its wide band gap and low oxygen reaction (OER) activity limited its application in photoelectrochemical (PEC) water splitting. In this work, we successfully constructed type-II Sb2(S,Se)3@TiO2 core-shell heterojunctions. Antimony sulfide selenide (Sb2(S,Se)3) was a quasi-one-dimensional light-absorbing material with an adjustable band gap (1.1-1.8 eV), which broadened the TiO2 light absorption range and effectively promoted the photogenerated carrier separation, transportation and utilization. Of particular note, novel Sb2(S,Se)3 nanospheres (NSPs) (ca. 69 nm) were in situ grown inside the tubes attributed to the unique space-confinement effect of TiO2 nanotubes (NTs). The IPCE value for Sb2(S,Se)3@TiO2 at 734 nm was 10.808% compared to 0.030% for TiO2. The separation efficiency and injection efficiency increased from 2.48% and 31.62% to 4.90% and 36.48%, respectively. The onset potential was moved negatively by 60 mV, and the maximum photocurrent density of 1.53 mA cm?2 at 1.23 V vs. RHE was 13.9 times higher than that of TiO2 (0.11 mA cm?2). This work provided a new idea for the application of TiO2 in the field of PEC water splitting. ? 2023 The Royal Society of Chemistry.Accession Number: 20234515011637