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1
Leresche, Nicolas. "Image du globe/image de soi : la pratique du selfie comme s(t)imulation géographique". Annales de géographie 719, n. 1 (2018): 59. http://dx.doi.org/10.3917/ag.719.0059.
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Tang, Siqi, Jiang Yan, Jing Zhang, Shuhua Wei, Qingzhu Zhang, Junjie Li, Min Fang et al. "Fabrication of Low Cost and Low Temperature Poly-Silicon Nanowire Sensor Arrays for Monolithic Three-Dimensional Integrated Circuits Applications". Nanomaterials 10, n. 12 (11 dicembre 2020): 2488. http://dx.doi.org/10.3390/nano10122488.
Abstract (sommario):
In this paper, the poly-Si nanowire (NW) field-effect transistor (FET) sensor arrays were fabricated by adopting low-temperature annealing (600 °C/30 s) and feasible spacer image transfer (SIT) processes for future monolithic three-dimensional integrated circuits (3D-ICs) applications. Compared with other fabrication methods of poly-Si NW sensors, the SIT process exhibits the characteristics of highly uniform poly-Si NW arrays with well-controlled morphology (about 25 nm in width and 35 nm in length). Conventional metal silicide and implantation techniques were introduced to reduce the parasitic resistance of source and drain (SD) and improve the conductivity. Therefore, the obtained sensors exhibit >106 switching ratios and 965 mV/dec subthreshold swing (SS), which exhibits similar results compared with that of SOI Si NW sensors. However, the poly-Si NW FET sensors show the Vth shift as high as about 178 ± 1 mV/pH, which is five times larger than that of the SOI Si NW sensors. The fabricated poly-Si NW sensors with 600 °C/30 s processing temperature and good device performance provide feasibility for future monolithic three-dimensional integrated circuit (3D-IC) applications.
3
Fitriyanto, Rachmad, Anton Yudhana e Sunardi Sunardi. "Boyer-Moore String Matching Algorithm and SHA512 Implementation for Jpeg/exif File Fingerprint Compilation in DSA". JUITA: Jurnal Informatika 8, n. 1 (4 maggio 2020): 1. http://dx.doi.org/10.30595/juita.v8i1.4413.
Abstract (sommario):
The jpeg/exif is file’s format for image produced by digital camera such as in the smartphones. The security method for jpeg/exif usages in digital communication currently only full-fill prevention aspect from three aspects of information security, prevention, detection and response. Digital Signature Algorithm (DSA) is a cryptographic method that provide detection aspect of information security by using hash-value as fingerprint of digital documents. The purpose of this research is to compile jpeg/exif file data fingerprint using the hash-value from DSA. The research conducted in four stages. The first stages is the identification of jpeg/exif file structure using Boyer-Moore string matching algorithm to locate the position of file’s segments. The second stage is segment’s content acquisition. The third stage the image files modification experiments to select the suitable element of jpeg/exif file data fingerprint. The fourth stage is the compilation of hash-values to form data fingerprint. The Obtained result has shown that the jpeg/exif file fingerprint comprises three hash value from the SOI segment, APP1's segment, and the SOF0 segment. The jpeg/exif file fingerprint can use for modified image detection, include six types of image modification there are image resizing, text addition, metadata modification, image resizing, image cropping and file type conversion
4
Segonne, Charlotte, Nathalie Huret, Sébastien Payan, Mathieu Gouhier e Valéry Catoire. "A Spectra Classification Methodology of Hyperspectral Infrared Images for Near Real-Time Estimation of the SO2 Emission Flux from Mount Etna with LARA Radiative Transfer Retrieval Model". Remote Sensing 12, n. 24 (16 dicembre 2020): 4107. http://dx.doi.org/10.3390/rs12244107.
Abstract (sommario):
Fast and accurate quantification of gas fluxes emitted by volcanoes is essential for the risk mitigation of explosive eruption, and for the fundamental understanding of shallow eruptive processes. Sulphur dioxide (SO2), in particular, is a reliable indicator to predict upcoming eruptions, and its systemic characterization allows the rapid assessment of sudden changes in eruptive dynamics. In this regard, infrared (IR) hyperspectral imaging is a promising new technology for accurately measure SO2 fluxes day and night at a frame rate down to 1 image per second. The thermal infrared region is not very sensitive to particle scattering, which is an asset for the study of volcanic plume. A ground based infrared hyperspectral imager was deployed during the IMAGETNA campaign in 2015 and provided high spectral resolution images of the Mount Etna (Sicily, Italy) plume from the North East Crater (NEC), mainly. The LongWave InfraRed (LWIR) hyperspectral imager, hereafter name Hyper-Cam, ranges between 850–1300 cm−1 (7.7–11.8 µm). The LATMOS (Laboratoire Atmosphères Milieux Observations Spatiales) Atmospheric Retrieval Algorithm (LARA), which is used to retrieve the slant column densities (SCD) of SO2, is a robust and a complete radiative transfer model, well adapted to the inversion of ground-based remote measurements. However, the calculation time to process the raw data and retrieve the infrared spectra, which is about seven days for the retrieval of one image of SO2 SCD, remains too high to infer near real-time (NRT) SO2 emission fluxes. A spectral image classification methodology based on two parameters extracting spectral features in the O3 and SO2 emission bands was developed to create a library. The relevance is evaluated in detail through tests. From data acquisition to the generation of SO2 SCD images, this method requires only ~40 s per image, which opens the possibility to infer NRT estimation of SO2 emission fluxes from IR hyperspectral imager measurements.
5
Le Mounier, Marie, e Alessandra Keller-Gerber. "Photographies d’auteurs en classe de langue : matrices pour se dire en langue-cible dans une nouvelle société-cible". Babylonia Journal of Language Education 3 (23 dicembre 2022): 34–39. http://dx.doi.org/10.55393/babylonia.v3i.214.
Abstract (sommario):
Dans le cadre d’un dispositif d’accueil d’étudiants internationaux à l’Université de Fribourg (CH), nous avons conçu, en 2021, une formation en français langue étrangère autour de photographies d’auteurs. Le dispositif intitulé Mise(s) en mots – mise(s) en images de soi, incitait les étudiants à porter un regard personnel sur leur expérience de mobilité. Après avoir suivi une présentation par genre (portrait, autoportrait, photographie de rue, paysage, nature morte), rencontré des artistes et leurs œuvres, les apprenants ont produit des images et des textes dans leur nouveau cadre de vie et d’études.
6
Xu, Ruiqi. "Evolution of the geographical image of the USSR in the presentation of Chinese writers (on example of Hu Shi and Chen Duxiu)". Pskov Journal of Regional Studies, n. 4 (2022): 53. http://dx.doi.org/10.37490/s221979310021909-2.
Abstract (sommario):
Geographical images are systems of ideas, concepts and stereotypes that represent a particular territory in people's minds. Geographical image is one of the most important means of describing and understanding a country. The study of geographical images is of great practical importance and contributes to various aspects of foreign policy, regional politics, intercultural communication and tourism. The aim of this study is to analyze the image of the USSR of the 1920s and 1930s in the works of the writers of the New Culture Movement on the example of the leading representatives of the movement, Chen Duxiu and Hu Shi. Hu Shi and Chen Duxiu were more concerned with the political image of the Soviet Union, and that their views were closely linked to their own political positions and views. After the October Revolution, Marxism spread widely in China and during this period, Hu Shi and Chen Duxiu lauded the Soviet Union as a great political experiment that deserved praise and opened up new avenues for human society. However, as the shortcomings and problems of the Soviet system became apparent and Chen Duxiu and Hu Shi's rejection of Marxist ideas changed their views of the Soviet Union, they began to criticize its problems and attack the dictatorial rule of Stalin.
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신의선. "A study on Insightful Mental Image in Su-shi`s Poetry". Journal of Chinese Language and Literature ll, n. 66 (agosto 2014): 5–28. http://dx.doi.org/10.15792/clsyn..66.201408.5.
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Gopal, M., e W. P. Jepson. "The Study of Dynamic Slug Flow Characteristics Using Digital Image Analysis—Part I: Flow Visualization". Journal of Energy Resources Technology 120, n. 2 (1 giugno 1998): 97–101. http://dx.doi.org/10.1115/1.2795032.
Abstract (sommario):
This paper reports the application of novel, digital image analysis techniques in the study of slug flow characteristics, under dynamic conditions in two-phase gas-liquid mixtures. Water and an oil of viscosity 18 cP were used for the liquid phase and carbon dioxide was used for the gas phase. Flow in a 75-mm i.d., 10-m long acrylic pipeline system was studied. Images of slugs were recorded on video by S-VHS cameras, using an audio-visual mixer. Each image was then digitized frame-by-frame and analyzed on a SGI™ workstation. Detailed slug characteristics, including liquid film heights, slug translational velocity, mixing length, and, slug length, were obtained.
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Gliß, Jonas, Kerstin Stebel, Arve Kylling e Aasmund Sudbø. "Improved optical flow velocity analysis in SO<sub>2</sub> camera images of volcanic plumes – implications for emission-rate retrievals investigated at Mt Etna, Italy and Guallatiri, Chile". Atmospheric Measurement Techniques 11, n. 2 (8 febbraio 2018): 781–801. http://dx.doi.org/10.5194/amt-11-781-2018.
Abstract (sommario):
Abstract. Accurate gas velocity measurements in emission plumes are highly desirable for various atmospheric remote sensing applications. The imaging technique of UV SO2 cameras is commonly used to monitor SO2 emissions from volcanoes and anthropogenic sources (e.g. power plants, ships). The camera systems capture the emission plumes at high spatial and temporal resolution. This allows the gas velocities in the plume to be retrieved directly from the images. The latter can be measured at a pixel level using optical flow (OF) algorithms. This is particularly advantageous under turbulent plume conditions. However, OF algorithms intrinsically rely on contrast in the images and often fail to detect motion in low-contrast image areas. We present a new method to identify ill-constrained OF motion vectors and replace them using the local average velocity vector. The latter is derived based on histograms of the retrieved OF motion fields. The new method is applied to two example data sets recorded at Mt Etna (Italy) and Guallatiri (Chile). We show that in many cases, the uncorrected OF yields significantly underestimated SO2 emission rates. We further show that our proposed correction can account for this and that it significantly improves the reliability of optical-flow-based gas velocity retrievals. In the case of Mt Etna, the SO2 emissions of the north-eastern crater are investigated. The corrected SO2 emission rates range between 4.8 and 10.7 kg s−1 (average of 7.1 ± 1.3 kg s−1) and are in good agreement with previously reported values. For the Guallatiri data, the emissions of the central crater and a fumarolic field are investigated. The retrieved SO2 emission rates are between 0.5 and 2.9 kg s−1 (average of 1.3 ± 0.5 kg s−1) and provide the first report of SO2 emissions from this remotely located and inaccessible volcano.
10
Kucera, Martin. "Schlampigkeit kostet". kma - Klinik Management aktuell 15, n. 02 (febbraio 2010): 56–59. http://dx.doi.org/10.1055/s-0036-1575513.
Abstract (sommario):
Krankenhausinfektionen können Patienten töten und Image und Budget einer Klinik erheblich beschädigen. Trotzdem sei das Bewusstsein für Hygiene in vielen Führungsetagen unterentwickelt und die Ausstattung mit Fachpersonal häufig mangelhaft, meinen Experten. Die dafür angeführten wirtschaftlichen Gründe sprächen aber dafür, das Gegenteil zu tun.
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Heuer, Claudia. "Haifischbecken Hamburg". kma - Klinik Management aktuell 11, n. 04 (aprile 2006): 36–43. http://dx.doi.org/10.1055/s-0036-1573701.
Abstract (sommario):
Tor zur Welt, Werbung, Medien auf der einen Seite. Hanseatische Arroganz und Spröde auf der anderen. Das Image der Hafenstadt wird sehr kontrovers diskutiert. Die meisten glauben, München sei größer und andere Städte freundlicher. Doch Hamburg ist eine der wenigen wachsenden Städte Deutschlands und dabei, sich zu einer Medizin-Metropole zu entwickeln.
12
BUI, E. N., e A. R. MERMUT. "QUANTIFICATION OF SOIL CALCIUM CARBONATES BY STAINING AND IMAGE ANALYSIS". Canadian Journal of Soil Science 69, n. 3 (1 agosto 1989): 677–82. http://dx.doi.org/10.4141/cjss89-066.
Abstract (sommario):
Quantification of calcium carbonates in a light-colored matrix or disseminated calcium carbonates cannot be obtained directly from impregnated blocks by image analysis. A method that combined staining by alizarin red-S with digital image analysis made it possible to identify and quantify soil calcium carbonates including the disseminated form in thin sections. Best results were obtained under reflected light using a tungsten lamp source. Photographic filters did not improve the image quality of stained calcium carbonates. Key words: Image analysis, soil micromorphometry
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Styk, Adam, Stanisław Świder e Sergei Semenov. "Making use of Digital Image Correlation to identify the true character of the applied load". Photonics Letters of Poland 15, n. 3 (30 settembre 2023): 39–41. http://dx.doi.org/10.4302/plp.v15i3.1217.
Abstract (sommario):
Digital Image Correlation became one of the dominant optical full-field techniques used in experimental mechanics. It does not require sophisticated equipment to evaluate the full displacement vector field of the specimen under test with great accuracy. In this paper, we would like to put the reader's attention to the DIC technique as a solution that may identify the genuine character of the load applied to the object under test. Our experience with testing wind turbine blades using DIC proves that possibility. Full Text: PDF References E.M.C Jones, M.A. Iadicola, "A good practises guide for digital image correlation" International Digital Image Correlation Society, (2018), CrossRef B. Pan, "Digital image correlation for surface deformation measurement: historical developments, recent advances and future goals", Meas. Sci. Technol. 29, 082001 (2018), CrossRef B. Pan, L.P. Yu, Q.B. Zhang, "Review of single-camera stereo-digital image correlation techniques for full-field 3D shape and deformation measurement", Sci. China Technol. Sci. 61, 2 (2018), CrossRef S. Sharma, N. Iniyan Thiruselvam, S.J. Subramanian, G.S. Kumar, "Computation of strains from stereo digital image correlation using principal component analysis", Meas. Sci. Technol. 32, 105201 (2021), CrossRef IEC 61400-5:2020 Wind energy generation systems - Part 5: Wind turbine, DirectLink IEC 61400-23:2014 Wind turbines - Part 23: Full-scale structural testing of rotor blades, DirectLink
14
Patrick, Van Esch, Mutti Paolo, Ruiz-Martinez Emilio, Abad Garcia Estefania, Mosconi Marita e Ortega Jon. "Counting neutrons with a commercial S-CMOS camera". EPJ Web of Conferences 170 (2018): 01018. http://dx.doi.org/10.1051/epjconf/201817001018.
Abstract (sommario):
It is possible to detect individual flashes from thermal neutron impacts in a ZnS scintillator using a CMOS camera looking at the scintillator screen, and off line image processing. Some preliminary results indicated that the efficiency of recognition could be improved by optimizing the light collection and the image processing. We will report on this ongoing work which is a result from the collaboration between ESS Bilbao and the ILL. The main progress to be reported is situated on the level of the on-line treatment of the imaging data. If this technology is to work on a genuine scientific instrument, it is necessary that all the processing happens on line, to avoid the accumulation of large amounts of image data to be analyzed off line. An FPGA-based real-time full-deca mode VME-compatible CameraLink board has been developed at the SCI of the ILL, which is able to manage the data flow from the camera and convert it in a reasonable “neutron impact” data flow like from a usual neutron counting detector. The main challenge of the endeavor is the optical light collection from the scintillator. While the light yield of a ZnS scintillator is a priori rather important, the amount of light collected with a photographic objective is small. Different scintillators and different light collection techniques have been experimented with and results will be shown for different setups improving upon the light recuperation on the camera sensor. Improvements on the algorithm side will also be presented. The algorithms have to be at the same time efficient in their recognition of neutron signals, in their rejection of noise signals (internal and external to the camera) but also have to be simple enough to be easily implemented in the FPGA. The path from the idea of detecting individual neutron impacts with a CMOS camera to a practical working instrument detector is challenging, and in this paper we will give an overview of the part of the road that has already been walked.
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Han, Deok, Haibo Yao, Zuzana Hruska, Russell Kincaid, Kanniah Rajasekaran e Deepak Bhatnagar. "Development of High-Speed Dual-Camera System for Batch Screening of Aflatoxin Contamination of Corn Using Multispectral Fluorescence Imaging". Transactions of the ASABE 62, n. 2 (2019): 381–91. http://dx.doi.org/10.13031/trans.13125.
Abstract (sommario):
Abstract. Aflatoxins are fungal toxins produced by . Food and feed crops contaminated with carcinogenic aflatoxins result in economic losses as well as potentially serious health issues. Grain elevators need to unload, on average, one 2.27 metric ton (MT) truckload every 2 min. Current sampling-based analytical chemistry methods for aflatoxin detection cannot meet these large throughput screening requirements. Therefore, a high-speed, batch screening system with reliable accuracy is needed. To develop a high-speed multispectral screening system, two high-performance cameras in conjunction with dual UV excitation sources and novel image processing software were used to collect fluorescence images of corn samples. Each camera simultaneously captures a single-band fluorescence image (436 nm or 532 nm) from corn kernel samples, and the detection software processes the images to automatically detect contaminated kernels using a normalized difference fluorescence index (NDFI). The system was tested with various commercial samples collected from different locations in the U.S. and baseline samples that were prepared by artificial field inoculation. Each sample was imaged and screened four times, and the screened samples were chemically analyzed for aflatoxin content. All samples were shuffled between imaging repetitions to increase the likelihood of screening both the germ and endosperm sides of every kernel. Processing time for each screening was less than 1 s. Sensitivity and specificity were measured over given thresholds for NDFI, and the results were promising. High sensitivity (0.987) and specificity (0.96) were achieved for the baseline samples, and high sensitivity (0.75 to 1) and somewhat lower specificity were obtained for the commercial samples. Keywords: Aflatoxin, Corn, Dual cameras, Fluorescence image, Multispectral image, Rapid and non-destructive detection, detection.
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Taylor, George, Sebastian Rost, Gregory A. Houseman e Gregor Hillers. "Near-surface structure of the North Anatolian Fault zone from Rayleigh and Love wave tomography using ambient seismic noise". Solid Earth 10, n. 2 (6 marzo 2019): 363–78. http://dx.doi.org/10.5194/se-10-363-2019.
Abstract (sommario):
Abstract. We use observations of surface waves in the ambient noise field recorded at a dense seismic array to image the North Anatolian Fault zone (NAFZ) in the region of the 1999 magnitude 7.6 Izmit earthquake in western Turkey. The NAFZ is a major strike-slip fault system extending ∼1200 km across northern Turkey that poses a high level of seismic hazard, particularly to the city of Istanbul. We obtain maps of phase velocity variation using surface wave tomography applied to Rayleigh and Love waves and construct high-resolution images of S-wave velocity in the upper 10 km of a 70 × 30 km region around Lake Sapanca. We observe low S-wave velocities (<2.5 km s−1) associated with the Adapazari and Pamukova sedimentary basins, as well as the northern branch of the NAFZ. In the Armutlu Block, between the two major branches of the NAFZ, we image higher velocities (>3.2 km s−1) associated with a shallow crystalline basement. We measure azimuthal anisotropy in our phase velocity observations, with the fast direction seeming to align with the strike of the fault at periods shorter than 4 s. At longer periods up to 10 s, the fast direction aligns with the direction of maximum extension for the region (∼45∘). The signatures of both the northern and southern branches of the NAFZ are clearly associated with strong gradients in seismic velocity that also denote the boundaries of major tectonic units. Our results support the conclusion that the development of the NAFZ has exploited this pre-existing contrast in physical properties.
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Liang, Xifeng, Ming Peng, Jie Lu e Chao Qin. "A Visual Servo Control Method for Tomato Cluster-Picking Manipulators Based on a T-S Fuzzy Neural Network". Transactions of the ASABE 64, n. 2 (2021): 529–43. http://dx.doi.org/10.13031/trans.13485.
Abstract (sommario):
HighlightsA T-S fuzzy neural network was applied to the visual servo control system of a tomato picking manipulator.The T-S fuzzy neural network structure was designed, and collected data were used to train the neural network model.A visual servo control system for the picking manipulator based on the neural network was designed and tested.The T-S fuzzy neural network was superior to a BP neural network in visual servo control of the picking manipulator.Abstract. To reduce the computational load of image Jacobian matrix estimation and to avoid the appearance of singularity of a Jacobian matrix in the visual servo control of a picking manipulator, a T-S fuzzy neural network algorithm is proposed to replace the image Jacobian matrix. This better fits the hand-eye relationship by combining the knowledge structure of fuzzy reasoning with the self-learning ability of a neural network. The T-S fuzzy neural network was trained and tested by collecting the variation data of image features and joint angles; after training, the T-S fuzzy neural network was used to predict the joint angles of the picking manipulator. Simulation results show that the square sum of training errors and testing errors were 0.017 and 0.032, respectively, after training the T-S fuzzy neural network. A T-S fuzzy neural network controller was applied to the visual servo system of the picking robot, and the test results show that the average difference between the end-effector and the ultimate target location of the visual servo system based on the T-S fuzzy neural network controller was 0.0037 m, which was 79.44% less than that of the visual servo system based on a BP neural network. The final average error of image features was between 0.52 and 3.25 pixels, which was 74.932% less than that of the visual servo system based on the BP neural network. Keywords: Picking manipulator, Tomato clusters, T-S fuzzy neural network, Visual servoing.
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Korac, Vojislav. "L'architecture monumentale de Byzance et de Serbie durant le dernier siècle de l'empire byzantin: Un traitement particulier des façades". Zbornik radova Vizantoloskog instituta, n. 43 (2006): 209–29. http://dx.doi.org/10.2298/zrvi0643209k.
Abstract (sommario):
(francuski) Les grands changements dans l'histoire de Byzance en ont influenc? l'art et l'architecture. Les restaurations venant apr?s la rupture de la vie de l'empire ont renouvel? la cr?ation artistique et de construction. Les reconstructions apportent des nouveaut?s. Le dernier si?cle est en Byzance et en Serbie particulier en architecture par sa conception diff?rente, nouvelle du traitement architectonique ext?rieur. C'est le fruit de la reconstruction marqu?e comme la renaissance des Pal?ologues. Les changements ne semblent pas importants, pourtant ils exerceront une influence essentielle sur l'architecture de l'?poque tardive. Le centre de gravit? est transf?r? aux fa?ades, trait?es ind?pendamment de la structure int?rieure du monument. Les changements sont visibles aux monuments de Constantinople et ensuite ? ceux des autres centres et r?gions. La nouvelle mani?re de traiter les surfaces des fa?ades est manifest? aux monuments de Constantinople, tels que l'?glise du Christ Pantocrator, ainsi qu'aux monuments messemvriens issus de la m?me conception. La fa?ade n'est plus simplement la paroi enfermant un espace mais une image en soi. Dans l'architecture serbe leur base est celle des ?uvres de l'?poque pr?c?dente marqu?e comme l'?cole serbe-byzantine. Aux monuments moraves les bases d?velopp?es et condens?es des fa?ades sont construites de mani?re semblable en composant des zones horizontales ind?pendamment de la structure int?rieure. La d?coration ext?rieure en relief en est l'une des marques essentielles. Un des monuments cl?s, de la fin de l'?poque mo avienne, celui du monast?re Kalenic, comporte le programme d?coratif respectant l'id?e de base de la construction.Ceci exprime un retour ? l'architecture pr?c?dente, ce qui fait de Kalenic dans son ensemble le mod?le des solutions nouvelles, apport?es par l'architecture moravienne. Le travail pr?sent mentionne les dilemmes scientifiques concernant l'origine de la d?coration en relief moravienne. Les monuments de Mistra y sont ?galement mentionn?s et leurs fa?ades trait?es avec de l'ambition artistique.
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Tian, Yanlin, Mingming Jia, Zongming Wang, Dehua Mao, Baojia Du e Chao Wang. "Monitoring Invasion Process of Spartina alterniflora by Seasonal Sentinel-2 Imagery and an Object-Based Random Forest Classification". Remote Sensing 12, n. 9 (27 aprile 2020): 1383. http://dx.doi.org/10.3390/rs12091383.
Abstract (sommario):
In the late 1990s, the exotic plant Spartina alterniflora (S. alterniflora), was introduced to the Zhangjiang Estuary of China for tidal zone reclamation and protection. However, it invaded rapidly and has caused serious ecological problems. Accurate information on the seasonal invasion of S. alterniflora is vital to understand invasion pattern and mechanism, especially at a high temporal resolution. This study aimed to explore the S. alterniflora invasion process at a seasonal scale from 2016 to 2018. However, due to the uncertainties caused by periodic inundation of local tides, accurately monitoring the spatial extent of S. alterniflora is challenging. Thus, to achieve the goal and address the challenge, we firstly built a high-quality seasonal Sentinel-2 image collection by developing a new submerged S. alterniflora index (SAI) to reduce the errors caused by high tide fluctuations. Then, an object-based random forest (RF) classification method was applied to the image collection. Finally, seasonal extents of S. alterniflora were captured. Results showed that (1) the red edge bands (bands 5, 6, and 7) of Sentinel-2 imagery played critical roles in delineating submerged S. alterniflora; (2) during March 2016 to November 2018, the extent of S. alterniflora increased from 151.7 to 270.3 ha, with an annual invasion rate of 39.5 ha; (3) S. alterniflora invaded with a rate of 31.5 ha/season during growing season and 12.1 ha/season during dormant season. To our knowledge, this is the first study monitoring S. alterniflora invasion process at a seasonal scale during continuous years, discovering that S. alterniflora also expands during dormant seasons. This discovery is of great significance for understanding the invasion pattern and mechanism of S. alterniflora and will facilitate coastal biodiversity conservation efforts.
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Dubakov, L. V., e Zhang Weining. "The poetics and functions of the Chinese national costume in the works of S. M. Tretyakov". Memoirs of NovSU, n. 5 (2023): 512–19. http://dx.doi.org/10.34680/2411-7951.2023.5(50).512-519.
Abstract (sommario):
The article analyzes the specifics of S. M. Tretyakov's creation of images of Chinese national costumes in arts journalistic works, written by him at the turn of the 1920s – 1930s. The relevance of the work determines the interest of modern literary criticism in the study of cultural intersections between Russia and China reflected in literature. The novelty of the work is due to the first attempt to analyze the peculiarities of the perception of Chinese culture (in this case, in terms of its everyday component) by the writer Tretyakov, who took a revolutionary position. The costume text of the cultural dilogy “Zhongguo” and “Deng Shi-hua” is distinguished by the author's desire to identify the authentic, deep features of Chinese culture and Chinese worldview. His attention is focused on the general Chinese cultural intentions, which he fixes and rejects as excessive and outdated – on traditionalism, on restraint, on the miniaturization of the costume and on the depersonalization of a person. The basis for creating the image of a costume by Tretyakov is a comparison and a metaphor. These tropes differ in his attitude to “decline”: the writer uses zoomorphic, gastronomic, objectifying comparisons, thereby pointing to the diminution of man in Chinese culture of the past and present against the background of the ongoing revolutionary changes.
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Rai, Nitin, Xin Sun, C. Igathinathane, Kirk Howatt e Michael Ostlie. "Aerial-Based Weed Detection Using Low-Cost and Lightweight Deep Learning Models on an Edge Platform". Journal of the ASABE 66, n. 5 (2023): 1041–55. http://dx.doi.org/10.13031/ja.15413.
Abstract (sommario):
Highlights Lightweight deep learning models were trained on an edge device to identify weeds in aerial images. A customized configuration file was setup to train the models. These models were deployed to detect weeds in aerial images and videos (near real-time). CSPMobileNet-v2 and YOLOv4-lite are recommended models for weed detection using edge platform. Abstract. Deep learning (DL) techniques have proven to be a successful approach in detecting weeds for site-specific weed management (SSWM). In the past, most of the research work has trained and deployed pre-trained DL models on high-end systems coupled with expensive graphical processing units (GPUs). However, only a limited number of research studies have used DL models on an edge system for aerial-based weed detection. Therefore, while focusing on hardware cost minimization, eight DL models were trained and deployed on an edge device to detect weeds in aerial-image context and videos in this study. Four large models, namely CSPDarkNet-53, DarkNet-53, DenseNet-201, and ResNet-50, along with four lightweight models, CSPMobileNet-v2, YOLOv4-lite, EfficientNet-B0, and DarkNet-Ref, were considered for training a customized DL architecture. Along with trained model performance scores (average precision score, mean average precision (mAP), intersection over union, precision, and recall), other model metrics to assess edge system performance such as billion floating-point operations/s (BFLOPS), frame rates/s (FPS), and GPU memory usage were also estimated. The lightweight CSPMobileNet-v2 and YOLOv4-lite models outperformed others in detecting weeds in aerial image context. These models were able to achieve a mAP score of 83.2% and 82.2%, delivering an FPS of 60.9 and 61.1 during near real-time weed detection in aerial videos, respectively. The popular ResNet-50 model achieved a mAP of 79.6%, which was the highest amongst all the large models deployed for weed detection tasks. Based on the results, the two lightweight models, namely, CSPMobileNet-v2 and YOLOv4-lite, are recommended, and they can be used on a low-cost edge system to detect weeds in aerial image context with significant accuracy. Keywords: Aerial image, Deep learning, Edge device, Precision agriculture, Weed detection.
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Blom, Nienke, Alexey Gokhberg e Andreas Fichtner. "Seismic waveform tomography of the central and eastern Mediterranean upper mantle". Solid Earth 11, n. 2 (30 aprile 2020): 669–90. http://dx.doi.org/10.5194/se-11-669-2020.
Abstract (sommario):
Abstract. We present a seismic waveform tomography of the upper mantle beneath the central and eastern Mediterranean down to the mantle transition zone. Our methodology incorporates in a consistent manner the information from body and multimode surface waves, source effects, frequency dependence, wavefront healing, anisotropy and attenuation. This allows us to jointly image multiple parameters of the crust and upper mantle. Based on the data from ∼ 17 000 unique source–receiver pairs, gathered from 80 earthquakes, we image radially anisotropic S velocity, P velocity and density. We use a multi-scale approach in which the longest periods (100–150 s) are inverted first, broadening to a period band of 28–150 s. Thanks to a strategy that combines long-period signals and a separation of body and surface wave signals, we are able to image down to the mantle transition zone in most of the model domain. Our model shows considerable detail in especially the northern part of the domain, where data coverage is very dense, and displays a number of clear and coherent high-velocity structures across the domain that can be linked to episodes of current and past subduction. These include the Hellenic subduction zone, the Cyprus subduction zone and high-velocity anomalies beneath the Italian peninsula and the Dinarides. This model is able to explain data from new events that were not included in the inversion.
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Castillo, C., M. R. James, M. D. Redel-Macías, R. Pérez e J. A. Gómez. "SF3M software: 3-D photo-reconstruction for non-expert users and its application to a gully network". SOIL 1, n. 2 (27 agosto 2015): 583–94. http://dx.doi.org/10.5194/soil-1-583-2015.
Abstract (sommario):
Abstract. Three-dimensional photo-reconstruction (PR) techniques have been successfully used to produce high-resolution surface models for different applications and over different spatial scales. However, innovative approaches are required to overcome some limitations that this technique may present for field image acquisition in challenging scene geometries. Here, we evaluate SF3M, a new graphical user interface for implementing a complete PR workflow based on freely available software (including external calls to VisualSFM and CloudCompare), in combination with a low-cost survey design for the reconstruction of a several-hundred-metres-long gully network. SF3M provided a semi-automated workflow for 3-D reconstruction requiring ~ 49 h (of which only 17 % required operator assistance) for obtaining a final gully network model of > 17 million points over a gully plan area of 4230 m2. We show that a walking itinerary along the gully perimeter using two lightweight automatic cameras (1 s time-lapse mode) and a 6 m long pole is an efficient method for 3-D monitoring of gullies, at a low cost (~ EUR 1000 budget for the field equipment) and the time requirements (~ 90 min for image collection). A mean error of 6.9 cm at the ground control points was found, mainly due to model deformations derived from the linear geometry of the gully and residual errors in camera calibration. The straightforward image collection and processing approach can be of great benefit for non-expert users working on gully erosion assessment.
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Kiefer, S., A. J. Bohn, S. P. Quanz, M. Kenworthy e T. Stolker. "Spectral and angular differential imaging with SPHERE/IFS". Astronomy & Astrophysics 652 (agosto 2021): A33. http://dx.doi.org/10.1051/0004-6361/202140285.
Abstract (sommario):
Context. Direct imaging of exoplanets is a challenging task that requires state-of-the-art instrumentation and advanced image-processing techniques. Differential imaging techniques have proven useful for the detection of exoplanet companions around stars. Angular differential imaging (ADI) and spectral differential imaging (SDI) are commonly used for direct detection and characterisation of young, Jovian exoplanets in datasets obtained with the SPHERE/IFS instrument. Aims. We compare the performance of ADI, SDI, and three combinations of ADI and SDI to find which technique achieves the highest signal-to-noise ratio (S/N), and we analyse their performance as functions of integration time, field rotation, and wavelength range. Methods. We analyse SPHERE/IFS observations of three known exoplanets, namely β Pictoris b, 51 Eridani b, and HR 8799 e, with five differential imaging techniques. We split the datasets into subsets to vary each parameter before the data are processed with each technique. The differential imaging techniques are applied using principal component analysis (PCA). Results. The tests show that a combination of SDI and ADI consistently achieves better results than ADI alone, and using SDI and ADI simultaneously (combined differential imaging; CODI) achieved the best results. The integration time test shows that targets with a separation larger than 0.24 arcsec observed with an integration time of more than 103 s were photon-noise limited. Field rotation shows a strong correlation with S/N for field rotations up to 1 full width at half maximum (FWHM), after which no significant increase in S/N with field rotation is observed. Wavelength range variation shows a general increase in S/N for broader wavelength ranges, but no clear correlation is seen. Conclusions. Spectral information is essential to boost S/N compared to regular ADI. Our results suggest that CODI should be the preferred processing technique to search for new exoplanets with SPHERE/IFS. To optimise direct-imaging observations, the field rotation should exceed 1 FWHM to detect exoplanets at small separations.
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ZHELTOUKHOV, S. G., A. M. TATARNIKOV, A. A. BELYAKOVA e E. A. KOKSHAROVA. "NEW INFRARED CAMERA OF THE CAUCASIAN MOUNTAIN OBSERVATORY OF THE SAI MSU: DESIGN, MAIN PARAMETERS AND RST LIGHT". Seriya 3: Fizika, Astronomiya, n. 1_2024 (5 marzo 2024): 2410801–1. http://dx.doi.org/10.55959/msu0579-9392.79.2410801.
Abstract (sommario):
The paper presents a prototype of an infrared photometer, made by the SAI of MSU on the base of a commercial infrared module Gavin-615A. The operating spectral range of the photometer is 3-5 µm. Studies of the photometer detector have shown that its parameters correspond to those declared by the manufacturer. Nonlinearity of the detector does not exceed ∼ 5% in the whole range of signals, coe cients of correction--function were determined. Additionally, we determined the readout noise RN = 1200 ± 210 e, conversioncoe cient GAIN = 520 ± 9 e/ADU, the BIAS = 960.5 ± 2.2 ADU, and dark current ≈ (9.3 ± 1.1) · 106-e /s,which consists of the sum of the detector dark current and radiation of the entrance window of the detector◦module. The value of dark current was measured at the window temperature of 6 C. Observations werestarted with the photometer at the 2.5-m telescope of the Causasian Mountain Observatory of MSU, the rst results are given in the paper. The unvignetted eld of view is 30'' . In the M band under good atmosphericconditions, an image quality is close to di raction limit. Images of a star with magnitude L = 7.96 and M = 6.78 were obtained with exposure of 20 seconds and a SNR∼10 ratio. It is shown that at high image quality with SNR=3 and exposure of 20 seconds it is possible to observe stars up to L ∼9m and M ∼8m . The main module of the photometer was also used for measurements of the sky background brightness.
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Li, Hui. "The Lyman-α Solar Telescope (LST) for the ASO-S mission". Proceedings of the International Astronomical Union 11, S320 (agosto 2015): 436–38. http://dx.doi.org/10.1017/s1743921316000533.
Abstract (sommario):
AbstractThe Lyman-α (Lyα) Solar Telescope (LST) is one of the payloads for the proposed Space-Borne Advanced Solar Observatory (ASO-S). LST consists of a Solar Disk Imager (SDI) with a field-of-view (FOV) of 1.2 R⊙ (R⊙ = solar radius), a Solar Corona Imager (SCI) with an FOV of 1.1 - 2.5 R⊙, and a full-disk White-light Solar Telescope (WST) with the same FOV as the SDI, which also serves as the guiding telescope. The SCI is designed to work in the Lyα (121.6 nm) waveband and white-light (for polarization brightness observation), while the SDI will work in the Lyα waveband only. The WST works in both visible (for guide) and ultraviolet (for science) broadband. The LST will observe the Sun from disk-center up to 2.5 R⊙ for both solar flares and coronal mass ejections with high tempo-spatial resolution
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Sr., Jan Novotný, e Jan Novotný. "Teplota sněhu při běhu na lyžích v obraze dynamické termografie (pilotní studie)". Studia sportiva 4, n. 2 (20 dicembre 2010): 25–32. http://dx.doi.org/10.5817/sts2010-2-3.
Abstract (sommario):
The effect of ski friction on the snow temperature increasing is known. Th e made water fi lm facilitates the ski moving. Th e aim of our pilot study was to ascertain a capability of the dynamic infrared thermography to register the quick thermal changes at determined point of snow before and aft er ski moving. We monitored snow aft er immediately before and aft er 12 runs of recreational cross-country skier by dynamic infrared thermography FLIR SC620 with image frequency 30 Hz. We found signifi cant increasing of snow temperature (by 0,2 to 1,7°C), linear dependence of snow warming on ski moving speed, and temperature increasing aft er ski waxing. Th e study confi rmed the dynamic infrared thermography ability to register very quick changes at determined point of snow temperature before and aft er (less than 0,033 s) cross-country skier moving. We have opened next thermodynamic studies for profound understanding of cross-country ski friction and gliding on snow.
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Andrés, Juvenal, Deyan Draganov, Martin Schimmel, Puy Ayarza, Imma Palomeras, Mario Ruiz e Ramon Carbonell. "Lithospheric image of the Central Iberian Zone (Iberian Massif) using global-phase seismic interferometry". Solid Earth 10, n. 6 (12 novembre 2019): 1937–50. http://dx.doi.org/10.5194/se-10-1937-2019.
Abstract (sommario):
Abstract. The Spanish Central System is an intraplate mountain range that divides the Iberian Inner Plateau in two sectors – the northern Duero Basin and the Tajo Basin to the south. The topography of the area is highly variable with the Tajo Basin having an average altitude of 450–500 m and the Duero Basin having a higher average altitude of 750–800 m. The Spanish Central System is characterized by a thick-skin pop-up and pop-down configuration formed by the reactivation of Variscan structures during the Alpine orogeny. The high topography is, most probably, the response of a tectonically thickened crust that should be the response to (1) the geometry of the Moho discontinuity, (2) an imbricated crustal architecture, and/or (3) the rheological properties of the lithosphere. Shedding some light on these features is the main target of the current investigation. In this work, we present the lithospheric-scale model across this part of the Iberian Massif. We have used data from the Central Iberian Massif Deformation (CIMDEF) project, which consists of recordings of an almost-linear array of 69 short-period seismic stations, which define a 320 km long transect. We have applied the so-called global-phase seismic interferometry. The technique uses continuous recordings of global earthquakes (>120∘ epicentral distance) to extract global phases and their reverberations within the lithosphere. The processing provides an approximation of the zero-offset reflection response of a single station to a vertical source, sending (near)-vertical seismic energy. Results indeed reveal a clear thickening of the crust below the Central System, resulting, most probably, from an imbrication of the lower crust. Accordingly, the crust–mantle boundary is mapped as a relatively flat interface at approximately 10 s two-way travel time except in the Central System, where this feature deepens towards the NW reaching more than 12 s. The boundary between the upper and lower crust is well defined and is found at 5 s two-way travel time. The upper crust has a very distinctive signature depending on the region. Reflectivity at upper-mantle depths is scattered throughout the profile, located between 13 and 18 s, and probably related to the Hales discontinuity.
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Vincenti, Luc. "De l’image-modèle à l’image de Dieu. Le dépassement de l’individu dans la doctrine éthique de Fichte, 1798–1812". Fichte-Studien 48 (2020): 171–84. http://dx.doi.org/10.5840/fichte20204813.
Abstract (sommario):
Fichte’s ethics changed in many ways between 1794 and 1812: in the first place spiritual life replaced the transformation of nature; individual supersession was radicalized; and ethics was linked with first philosophy. In 1812 it was no longer a matter of inflecting natural necessity by means of the model image of an ideal world (Vorbild). The theme of image reappears as an externalizing of absolute life. Ethical action becomes a moment of this manifestation: a return to unity, following the process of fragmentation of the originary phenomenon (the I or the I-one), into an infinity of individual I’s. This fragmentation is fondamental: life is self-consciousness only in this individual form. The ethical act manifests the concept or image of God with the self-annihilation of individuality. Fichte had already written, in part XI of the Second Introduction, that the I, “only reasonnable”, “is no longer an individual”, and in the first Sittenlehre, § 18 : “We are all supposed to act identically”. Fichte’s final Ethics thus does not radicalize the supersession of the individual. It defines the rational individual by this supersession of himself [or herself], making ethics into a moment [stage] of the absolute life. The matter is not to merge the individual into the whole, but to partake in a living order, in the activity of the whole, which reaches out to each of its members, only to return to the first unity, by forming the whole as such.De 1794 à 1812, l’éthique de Fichte connaît plusieurs évolutions : abandon de la transformation de la nature au profit de la vie spirituelle, radicalisation du dépassement de l’individu, et rapprochement entre éthique et philosophie première. En 1812 il n’est plus question d’infléchir la nécessité naturelle par l’image modeèe (Vorbild) d’un monde idéal. La thématique de l’image apparaît comme extériorisation de la vie absolue. L’action éthique devient un moment de cette manifestation : le retour vers l’un, au terme d’un morcellement du phénomène originaire (le »Moi« ou »Moi un«) en une infinité de Moi(s) individuels. Cette diffraction est essentielle : la vie ne peut être consciente d’elle-même que dans cette forme individuelle. L’agir éthique manifeste le concept ou l’image de Dieu en anéantissant l’individualité. Mais la XIe section de la Seconde Introduction précisait déjà, que dans le monde moral, le Moi »uniquement raisonnable«, »a cessé d’être un individu« et dans la première Sittenlehre, § 18, Fichte écrivait : »Nous devons tous agir de la même manière«. L’éthique tardive ne radicalise donc pas le dépassement de l’individu. Elle définit l’individu rationnel par le dépassement de soi, en faisant de l’éthique un moment de la vie absolue. La question est donc moins de fondre l’individu dans un tout que de participer à un ordre vivant, à l’activité du tout qui va jusqu’à chacun des membres pour revenir vers l’unité première en constituant la totalité comme telle.
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Supej, Matej, Anton Kalén, Nina Verdel, Jan Ogrin e Hans-Christer Holmberg. "The Contribution of Ski Poles to Aerodynamic Drag in Alpine Skiing". Applied Sciences 13, n. 14 (13 luglio 2023): 8152. http://dx.doi.org/10.3390/app13148152.
Abstract (sommario):
The present study was designed to determine the contribution of the cross-sectional area of the ski poles (Sp) to the total aerodynamic drag during alpine skiing. At three different wind speeds in a wind tunnel, 10 skiers assumed typical alpine skiing postures (high, middle, and tuck), and their frontal aerodynamic drag was assessed with a force plate and their cross-sectional area, along with that of their ski poles, determined by interactive image segmentation. The data collected were utilized to examine intra-subject variation in Sp, the effects of Sp on the coefficient of aerodynamic drag (Cd), and the product of Cd and total cross-sectional area (Cd∙S. The major findings were as follows: (i) Sp ranged from 0.0067 (tuck position) to 0.0262 m2 (middle position), contributing 2.2–4.8% of the total cross-sectional area, respectively; (ii) Sp was dependent on wind speed in the high and middle positions; (iii) intra-subject variations ranged from 0.0018 m2 (27.6%) in the tuck position to 0.0072 m2 (30.5%) in the high position; (iv) Sp exerted a likely effect on Cd and Cd∙S. The extensive intra- and inter-skier variability in Sp can account for as much as ~5% of the total frontal cross-sectional area and future investigations on how elite skiers optimize their positioning of the poles in a manner that reduces aerodynamic drag are warranted.
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Hsieh, Wan-Hsuan, Yi-Chun Liu, Chung-En Tsai e Cheewee Liu. "(Digital Presentation) Diffusion and Segregation in Highly Stacked Ge0.9Sn0.1/Ge:B and Ge0.95Si0.05/Ge:P Epilayers". ECS Meeting Abstracts MA2022-01, n. 29 (7 luglio 2022): 1284. http://dx.doi.org/10.1149/ma2022-01291284mtgabs.
Abstract (sommario):
GeSn and GeSi are promising channel materials for gate-all-around (GAA) devices to achieve the high ION thanks to the high mobility [1, 2]. The undoped channels are used to reduce the impurity scattering and to further enhance the mobility. The GAA structure with high number of stacked channels can further enhance the ION for a fixed footprint. The dopant diffusion and segregation play an important role on GAA device structure design. In this work, the dopant diffusion and segregation effects of B and P in highly stacked Ge0.9Sn0.1 and Ge0.95Si0.05 epilayers are investigated, respectively. The Ge:B/Ge0.9Sn0.1/Ge:B epilayers were grown on the Ge-buffered SOI substrate at 320°C and 100 torr by chemical vapor deposition (CVD) using SnCl4, Ge2H6, and B2H6 precursors. The 160nm undoped Ge buffer was grown with an 800℃ annealing to confine the misfit dislocations at Ge/Si interface. For the 8 stacked Ge0.9Sn0.1 epilayers, 36 nm Ge0.9Sn0.1 layers sandwiched by 24 nm Ge:B layers were grown. Transmission electron microscopy (TEM) image of Ge:B/Ge0.9Sn0.1/Ge:B epilayers is shown in Fig. 1(a). The Ge:P/Ge0.95Si0.05/Ge:P epilayers were grown on the Ge-buffered SOI substrate at 350°C and 100 torr by SiH4, GeH4, and PH3 precursors using similar Ge buffer layers. For the 8 stacked Ge0.95Si0.05 epilayers, 24 nm Ge0.95Si0.05 layers sandwiched by 25 nm Ge:P layers were grown. TEM image of Ge:P/Ge0.95Si0.05/Ge:P epilayers is shown in Fig. 1(b). Note that both Ge0.9Sn0.1 and Ge0.95Si0.05 channel layers are unintentionally doped. In the 8 stacked Ge0.9Sn0.1 epilayers, the [B] in the Ge:B layers is as high as ~2.0 ×1021 cm−3 (Fig. 2(a)). In the 8 stacked Ge0.95Si0.05 epilayers, the [P] in the Ge:P layers is as high as ~2.2 × 1020 cm−3 , and the minimum [P] in the Ge0.95Si0.05 channel layers is from ~4.2 ×1017 cm−3 to ~1.5 ×1018 cm−3 (Fig. 2(b)). The B and P diffusion phenomena in the GeSn and GeSi layers are investigated, respectively. The deep undoped GeSi layers have higher [P] due to higher thermal budget (Fig. 3). Note that the P atoms diffuse from the Ge:P layers into GeSi channels during the epitaxial growth. The similar [B] ~3x1016cm-3 in the 2nd to 8th GeSn layers is due to the B detection limit of SIMS analysis (Fig. 3). Note that the decay length (nm/decade) is defined in Fig. 4 and Fig. 5. The decay length of [B] on the top side (4.3 nm/decade) is larger than that on the bottom side (2.9 nm/decade) due to SIMS knock-on effect [3] (Fig. 4). On the other hand, the P segregation [4] increases the decay length on the bottom side of GeSi layers (Fig. 5). Both the decay length of [B] and [P] increase with the increasing depth (Fig. 6) due to the higher thermal budget of the deeper layers in the CVD chamber. In addition, the difference of [B] decay length between top and bottom sides increases with the increasing depth of epilayers (Fig. 6). For the Ge:P/GeSi/Ge:P epilayers, the difference between top and bottom [P] decay length (less than 0.9 nm/decade) is smaller than that of [B] decay length in Ge:B/GeSn/Ge:B epilayers (larger than 1.4 nm/decade) due to P segregation, and the difference decreases for deep layers. Acknowledgment This work is supported by the Ministry of Science and Technology, Taiwan (MOST 110-2622-8-002-014-, 110-2218-E-002-030-, and 110-2218-E-002-042-MBK) and the Ministry of Education, Taiwan (NTU-CC-110L892601). The support by Taiwan Semiconductor Research Institute (TSRI), Hsinchu, Taiwan, is also highly appreciated. References [1] Y.-S. Huang et al., IEDM, 2020, pp. 23. [2] Y.-C. Liu et al., VLSI, 2021, T15-2. [3] W.-H. Tu et al., IEEE Trans. Electron Devices, vol. 61, no. 7, pp. 2595–2598, Jul. 2014. [4] S. Kobayashi et al., Journal of Applied Physics 86, 5480, 1999. Figure 1
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Suzuki, Akihiro, Yoshiya Niida, Yasumasa Joti, Yoshitaka Bessho e Yoshinori Nishino. "Damage-Free Femtosecond X-Ray Laser Snapshot Imaging of Catalyst Layer Nano-Structures of Polymer Electrolyte Fuel Cells". ECS Meeting Abstracts MA2022-02, n. 39 (9 ottobre 2022): 1419. http://dx.doi.org/10.1149/ma2022-02391419mtgabs.
Abstract (sommario):
The realization of the hydrogen society, where hydrogen is used as clean and renewable energy, is desired to reduce carbon dioxide emissions and achieve sustainable development. The polymer electrolyte fuel cell (PEFC) is a key technology for automobiles in the hydrogen society as an alternative to conventional internal combustion engines. However, further improvements in PEFC performances are required for the full-scale spread of fuel cell vehicles. This study aims to image the nanostructures of the catalyst layer, which is particularly important in determining the performance of PEFCs, and correlate the observed structures with mass transfer in the catalyst layer. The catalyst layer contains catalyst-loaded carbon supports thinly covered with an ionomer responsible for proton conduction. We are especially interested in observing the support structure and ionomer coverage. We performed coherent X-ray imaging studies on the catalyst particles of PEFCs using an X-ray free-electron laser (XFEL) facility: SACLA (SPring-8 Angstrom Compact free electron LAser). Femtosecond XFEL allows us to capture radiation-damage-free snapshot images by outrunning major radiation damage processes. Damage-free imaging is of great value because radiation damage often causes a problem in high-resolution electron microscopy observation of ionomers. We used the coherent diffractive imaging (CDI) technique to observe catalyst particles of PEFCs. In CDI, sample images are reconstructed from measured coherent diffraction patterns using phase-retrieval calculation instead of objective lenses. CDI enables quantitative phase imaging and allows high-contrast imaging of the catalyst particles, which are almost transparent to X-rays. The measurement was carried out for catalyst particles in the dried condition and in solution. Our study showed that the image contrast can be adjusted by changing the electron density of the volume surrounding the sample1). The dried sample was prepared by dropping catalyst ink onto a silicon nitride membrane and air-dried. The solution sample was enclosed in micro-liquid enclosure arrays2,3) developed at Hokkaido University. The coherent diffraction patterns were measured by irradiating the sample catalyst particles with the 100-nm-focused XFEL beam with a photon energy of 4 keV using MAXIC-S (Multiple Application X-ray Imaging Chamber-S)4). The phase-retrieval calculation reconstructed the sample images. Fig. 1 shows a reconstructed image of a catalyst particle in water. The reconstructed image shows many white spots, which can be interpreted as platinum-cobalt catalysts. The pixel size of the reconstructed image is 1.3 nm, demonstrating among the highest spatial resolution in X-ray imaging. We will continue our study to observe the support structures and their ionomer coverage to understand the mass transfer in the catalyst layer. This work was supported by the FC-Platform of NEDO (New Energy and Industrial Technology Development Organization). The XFEL experiments were performed at SACLA with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2020A8106, 2021A8010, and 2021B8019). References: 1) A. Suzuki1, H. Tanaka, H. Yamashige, Y. Orikasa, Y. Niida, T. Kimura, K. Tono, M. Yabashi, T. Ishikawa, Y. Bessho, Y. Joti, and Y. Nishino, Femtosecond X-ray laser reveals intact sea-island structures of metastable solid-state electrolytes for batteries, submitted (2022). 2) T. Kimura, Y. Joti, A. Shibuya, C. Song, S. Kim, K. Tono, M. Yabashi, M. Tamakoshi, T. Moriya, T. Oshima, T. Ishikawa, Y. Bessho and Y. Nishino, Imaging live cell in micro-liquid enclosure by X-ray laser diffraction, Nat. Commun. 5, 3052 (2014). 3) T. Kimura, A. Suzuki, Y. Yang, Y. Niida, A. Nishioka, M. Takei, J. Wei, H. Mitomo, Y. Matsuo, K. Niikura, K. Ijiro, K. Tono, M. Yabashi, T. Ishikawa, T. Oshima, Y. Bessho, Y. Joti, and Y. Nishino, Micro-liquid enclosure array and its semi-automated assembling system for x-ray free-electron laser diffractive imaging of samples in solution, Rev. Sci. Instrum. 91, 083706 (2020). 4) H. Yumoto, T. Koyama, A. Suzuki, Y. Joti, Y. Niida, K. Tono, Y. Bessho, M. Yabashi, Y. Nishino, and H. Ohashi, High-fluence high-gain multilayer focusing optics to enhance spatial resolution in femtosecond X-ray laser imaging, submitted (2022). Figure 1
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Riesz, Ferenc. "The effects of the global surface curvature on Makyoh-topogaphy imaging". Photonics Letters of Poland 11, n. 1 (3 aprile 2019): 4. http://dx.doi.org/10.4302/plp.v11i1.862.
Abstract (sommario):
The effects of the global curvature of the reflecting surface on Makyoh (magic-mirror) topography imaging is analysed based on a geometrical optical model. It is shown that the effects can be taken into account by introducing an equivalent screen-to-sample distance which is a function of the real screen-to-sample distance and the global curvature. The special limiting cases are discussed and analysed for practical applications. Full Text: PDF ReferencesK. Kugimiya, "“Makyoh”: The 2000 year old technology still alive", J. Cryst. Growth 103, 420 (1990). CrossRef P. Blaustein, S. Hahn, "Realtime inspection of wafer surfaces", Solid State Technol. 32, 27 (1989). CrossRef Z.J. Pei, G.R. Fisher, M. Bhagavat, S. Kassir, "A grinding-based manufacturing method for silicon wafers: an experimental investigation", Int. J. Machine Tools Manufacture 45, 1140 (2005). CrossRef F. Riesz, "Makyoh topography: a simple yet powerful optical method for flatness and defect characterization of mirror-like surfaces", Proc. SPIE 5458, 86 (2004). CrossRef T. Hirogaki, E. Aoyama, R. Machinaka, H. Sueda, K. Ogawa, J. Japan Soc. Precision Eng. 73, 96 (2007). CrossRef G. Saines, M.G. Tomilin, "Magic mirrors of the Orient", J. Opt. Technol. 66, 758 (1999). CrossRef W.E. Ayrton, J. Perry, "The Magic Mirror of Japan. Part I", Proc. Roy. Soc. London 28, 127 (1878). CrossRef M.V. Berry, "Oriental magic mirrors and the Laplacian image", Eur. J. Phys. 27, 109 (2006). CrossRef F. Riesz, "Sensitivity and detectability in Makyoh imaging", Optik 122, 2115 (2011). CrossRef Z.J. Laczik, "Quantitative Makyoh topography", Opt. Eng. 39, 2562 (2000). CrossRef F. Riesz, "Geometrical optical model of the image formation in Makyoh (magic-mirror) topography", J. Phys. D: Appl. Phys. 33, 3033 (2000). CrossRef F. Riesz, "Camera length and field of view in Makyoh-topography instruments", Rev. Sci. Instr. 72, 1591 (2001). CrossRef J. Szabó, F. Riesz, B. Szentpáli, "Makyoh Topography: Curvature Measurements and Implications for the Image Formation", Japan. J. Appl. Phys. 35, L258 (1996). CrossRef F. Riesz, "Non-linearity and related features of Makyoh (magic-mirror) imaging", J. Opt. 15, 075709 (2013). CrossRef A.V. Gitin, "System approach to image formation in a magic mirror", Appl. Opt. 48, 1268 (2009). CrossRef
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Haslam, Gerald. "Hayakawa Among the Conservatives". Boom 1, n. 4 (2011): 10–15. http://dx.doi.org/10.1525/boom.2011.1.4.10.
Abstract (sommario):
Author, lecturer, and long-time liberal Democrat S.I. Hayakawa joined the faculty of San Francisco State College in 1955. A general semanticist, he became acting president of the school during the student strike of 1968-69, and rode the fame generated then into the U..S Senate as a hard-nosed Republican. He was not an effective senator and served only one term, becoming infamous for sleeping during meetings. He also justified the World War II internment of Japanese Americans and Canadians and favored declaring English America's national language. His later image as an anti-immigrant bumbler seems a parody of the man, but an evaluation of the sum of his accomplishments suggests there was much more to him than his opponents concede.
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Picart, Pascal. "Recent advances in speckle decorrelation modeling and processing in digital holographic interferometry". Photonics Letters of Poland 13, n. 4 (30 dicembre 2021): 73. http://dx.doi.org/10.4302/plp.v13i4.1126.
Abstract (sommario):
Digital holography, and especially digital holographic interferometry, is a powerful approach for the characterization of modifications at the surface or in the volume of objects. Nevertheless, the reconstructed phase data from holographic interferometry is corrupted by the speckle noise. In this paper, we discuss on recent advances in speckle decorrelation noise removal. Two main topics are considered. The first one presents recent results in modelling the decorrelation noise in digital Fresnel holography. Especially the anisotropy of the decorrelation noise is established. The second topic presents a new approach for speckle de-noising using deep convolution neural networks. Full Text: PDF ReferencesP. Picart (ed.), New techniques in digital holography (John Wiley & Sons, 2015). CrossRef T.M. Biewer, J.C. Sawyer, C.D. Smith, C.E. Thomas, "Dual laser holography for in situ measurement of plasma facing component erosion (invited)", Rev. Sci. Instr. 89, 10J123 (2018). CrossRef M. Fratz, T. Beckmann, J. Anders, A. Bertz, M. Bayer, T. Gießler, C. Nemeth, D. Carl, "Inline application of digital holography [Invited]", Appl. Opt. 58(34), G120 (2019). CrossRef M.P. Georges, J.-F. Vandenrijt, C. Thizy, Y. Stockman, P. Queeckers, F. Dubois, D. Doyle, "Digital holographic interferometry with CO2 lasers and diffuse illumination applied to large space reflector metrology [Invited]", Appl. Opt. 52(1), A102 (2013). CrossRef E. Meteyer, F. Foucart, M. Secail-Geraud, P. Picart, C. Pezerat, "Full-field force identification with high-speed digital holography", Mech. Syst. Signal Process. 164 (2022). CrossRef L. Lagny, M. Secail-Geraud, J. Le Meur, S. Montresor, K. Heggarty, C. Pezerat, P. Picart, "Visualization of travelling waves propagating in a plate equipped with 2D ABH using wide-field holographic vibrometry", J. Sound Vib. 461 114925 (2019). CrossRef L. Valzania, Y. Zhao, L. Rong, D. Wang, M. Georges, E. Hack, P. Zolliker, "THz coherent lensless imaging", Appl. Opt. 58, G256 (2019). CrossRef V. Bianco, P. Memmolo, M. Leo, S. Montresor, C. Distante, M. Paturzo, P. Picart, B. Javidi, P. Ferraro, "Strategies for reducing speckle noise in digital holography", Light: Sci. Appl. 7(1), 1 (2018). CrossRef V. Bianco, P. Memmolo, M. Paturzo, A. Finizio, B. Javidi, P. Ferraro, "Quasi noise-free digital holography", Light. Sci. Appl. 5(9), e16142 (2016). CrossRef R. Horisaki, R. Takagi, J. Tanida, "Deep-learning-generated holography", Appl. Opt. 57(14), 3859 (2018). CrossRef E. Meteyer, F. Foucart, C. Pezerat, P. Picart, "Modeling of speckle decorrelation in digital Fresnel holographic interferometry", Opt. Expr. 29(22), 36180 (2021). CrossRef M. Piniard, B. Sorrente, G. Hug, P. Picart, "Theoretical analysis of surface-shape-induced decorrelation noise in multi-wavelength digital holography", Opt. Expr. 29(10), 14720 (2021). CrossRef P. Picart, S. Montresor, O. Sakharuk, L. Muravsky, "Refocus criterion based on maximization of the coherence factor in digital three-wavelength holographic interferometry", Opt. Lett. 42(2), 275 (2017). CrossRef P. Picart, J. Leval, "General theoretical formulation of image formation in digital Fresnel holography", J. Opt. Soc. Am. A 25, 1744 (2008). CrossRef S. Montresor, P. Picart, "Quantitative appraisal for noise reduction in digital holographic phase imaging", Opt. Expr. 24(13), 14322 (2016). CrossRef S. Montresor, M. Tahon, A. Laurent, P. Picart, "Computational de-noising based on deep learning for phase data in digital holographic interferometry", APL Photonics 5(3), 030802 (2020). CrossRef M. Tahon, S. Montresor, P. Picart, "Towards Reduced CNNs for De-Noising Phase Images Corrupted with Speckle Noise", Photonics 8(7), 255 (2021). CrossRef E. Meteyer, S. Montresor, F. Foucart, J. Le Meur, K. Heggarty, C. Pezerat, P. Picart, "Lock-in vibration retrieval based on high-speed full-field coherent imaging", Sci. Rep. 11(1), 1 (2021). CrossRef
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Nutu, Liliana. "THE SEDUCTION OF WORDS AND FLESH AND THE DESIRE OF GOD: A POSTSTRUCTURALIST READING OF JOHN 1:1, 14 AND THE PILLOW BOOK". Biblical Interpretation 11, n. 1 (2003): 79–97. http://dx.doi.org/10.1163/15685150360495589.
Abstract (sommario):
This paper looks at John 1:1, 14 and Peter Greenaway's film The Pillow Book with the intention of reading afresh the Incarnation of the Word in the former and the Inscription of the Flesh in the latter, while focusing on the seduction of word(s) and flesh, the dynamics of speech and writing, and the desire of God, through poststructuralist theory. It investigates the relationship between text and image, and text, image, and reader, and it exposes the ocular-erotic character of reading. Connected to one of the most valuable collections of writings in Japanese literature, namely The Pillow Book of Sei Shonagon , Greenaway's film treats the 'delights of the flesh and the delights of literature' as indistinguishable from each other. This paper defends the idea that the Incarnation exposes the reciprocity of desire of God: God desires our flesh as much as we desire his Word; and it identifies the Incarnation as the hymen which both unites and separates the human and the divine, the immanent and the transcendent, the flesh and the word, the audience and the book, this world and the other, foreplay and orgasm.
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Marticorena Garcia, Stephan R., Jing Guo, Michael Dürr, Timm Denecke, Bernd Hamm, Ingolf Sack e Thomas Fischer. "Comparison of ultrasound shear wave elastography with magnetic resonance elastography and renal microvascular flow in the assessment of chronic renal allograft dysfunction". Acta Radiologica 59, n. 9 (17 dicembre 2017): 1139–45. http://dx.doi.org/10.1177/0284185117748488.
Abstract (sommario):
Background Monitoring of renal allograft function is essential for early identification of dysfunction and improvement of kidney transplant (KTX) outcome. Purpose To non-invasively assess renal stiffness in KTX recipients using ultrasound shear wave elastography (USE) in correlation with multifrequency magnetic resonance elastography (MRE), renal allograft function, and renal microvascular flow determined using a novel ultrasound microvascular imaging technique. Material and Methods This prospective study investigated 25 KTXs (functional KTX [FCT], n = 14; chronic KTX insufficiency [DYS], n = 11) in 20 KTX recipients (mean age = 43 ± 14 years). USE was performed using a high-frequency broadband linear transducer and compared with MRE. Shear wave velocity (SWV) was correlated with the estimated glomerular filtration rate (eGFR). Qualitative differences in renal microvascular flow were obtained using SMI. Results FCT had higher SWV than DYS in both cortex and pyramids (cortex, FCT: 3.75 ± 0.82 m/s vs. DYS: 2.79 ± 0.73 m/s, P = 0.0002; pyramid, FCT: 2.89 ± 0.46 m/s vs. DYS: 2.39 ± 0.34 m/s, P = 0.044). Cutoff values of 3.265 m/s for cortex, 2.535 m/s for pyramids, and 2.985 m/s for combined non-hilar parenchyma provided sensitivities of 72.7%, 77.8%, and 90.9% and specificities of 71.4%, 78.6%, and 85.7% for detecting renal allograft dysfunction with area under the receiver operating characteristic curve (AUC) values of 0.831, 0.841, 0.925 (95% confidence interval [CI] = 0.67–0.99, 0.66–1.02, 0.83–1.03). USE correlated positively with eGFR ( r = 0.741, P = 0.0004) and with MRE-derived SWV ( r = 0.562, P = 0.004). Renal microvascular flow was decreased in DYS. Conclusion USE is sensitive to renal allograft dysfunction, which is characterized by reduced SWV and renal perfusion. USE has higher image resolution than MRE, while MRE has slightly better diagnostic accuracy.
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Koo, In-Hoi, Keon-Hyeong Lee, Min-Su Kim, Hyung-Seok Han, Holak Kim e Jeong-Yeol Choi. "Effects of Injector Configuration on the Detonation Characteristics and Propulsion Performance of Rotating Detonation Engine (RDE)". Aerospace 10, n. 11 (8 novembre 2023): 949. http://dx.doi.org/10.3390/aerospace10110949.
Abstract (sommario):
Fuel injection and mixing affect the characteristics of detonation initiation and propagation, as well as the propulsion performance of rotating detonation engine (RDE). A study on the injector is carried out in the present investigation. A rectangular-shaped hole-type fuel injector (RHFI) and slit-type fuel injector (SFI) were designed and compared experimentally at equivalent conditions. The investigation of the detonation propagation modes and the analysis of propulsion performance were carried out using fast Fourier transform (FFT), short-time Fourier transform (STFT), and unwrapped image post-processing. Under 50, 75, and 100 g/s flow rate conditions at an equivalence ratio of 1.0 ± 0.05, the RHFI has relatively stable detonation propagation characteristics, higher thrust, and specific impulse performance. Additionally, the results of the experiment indicate that the number of detonation waves affects performance.
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Fuente, A., S. P. Treviño-Morales, T. Alonso-Albi, A. Sánchez-Monge, P. Rivière-Marichalar e D. Navarro-Almaida. "Probing the kinematics and chemistry of the hot core Mon R2 IRS 3 using ALMA observations". Monthly Notices of the Royal Astronomical Society 507, n. 2 (2 agosto 2021): 1886–98. http://dx.doi.org/10.1093/mnras/stab2216.
Abstract (sommario):
ABSTRACT We present high angular resolution 1.1 mm continuum and spectroscopic Atacama Large Millimeter/submillimeter Array observations of the well-known massive protocluster Mon R2 IRS 3. The continuum image at 1.1 mm shows two components, IRS 3 A and IRS 3 B, that are separated by ∼0.65 arcsec. We estimate that IRS 3 A is responsible of ∼80 per cent of the continuum flux, being the most massive component. We explore the chemistry of IRS 3 A based on the spectroscopic observations. In particular, we have detected intense lines of S-bearing species such as SO, SO2, H2CS, and OCS, and of the complex organic molecules (COMs) methyl formate (CH3OCHO) and dimethyl ether (CH3OCH3). The integrated intensity maps of most species show a compact clump centred on IRS 3 A, except the emission of the COMs that is more intense towards the near-IR nebula located to the south of IRS 3 A, and HC3N whose emission peak is located ∼0.5 arcsec NE from IRS 3 A. The kinematical study suggests that the molecular emission is mainly coming from a rotating ring and/or an unresolved disc. Additional components are traced by the ro-vibrational HCN ν2 = 1 3→2 line which is probing the inner disc/jet region, and the weak lines of CH3OCHO, more likely arising from the walls of the cavity excavated by the molecular outflow. Based on SO2 we derive a gas kinetic temperature of T$_k\, \sim$ 170 K towards the IRS 3 A. The most abundant S-bearing species is SO2 with an abundance of ∼ 1.3 × 10−7, and χ(SO/SO2) ∼ 0.29. Assuming the solar abundance, SO2 accounts for ∼1 per cent of the sulphur budget.
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Nguyen, Tran Xuan Bach, e Javaan Chahl. "Sparse Optical Flow Implementation Using a Neural Network for Low-Resolution Thermal Aerial Imaging". Journal of Imaging 8, n. 10 (12 ottobre 2022): 279. http://dx.doi.org/10.3390/jimaging8100279.
Abstract (sommario):
This study is inspired by the widely used algorithm for real-time optical flow, the sparse Lucas–Kanade, by applying a feature extractor to decrease the computational requirement of optical flow based neural networks from real-world thermal aerial imagery. Although deep-learning-based algorithms have achieved state-of-the-art accuracy and have outperformed most traditional techniques, most of them cannot be implemented on a small multi-rotor UAV due to size and weight constraints on the platform. This challenge comes from the high computational cost of these techniques, with implementations requiring an integrated graphics processing unit with a powerful on-board computer to run in real time, resulting in a larger payload and consequently shorter flight time. For navigation applications that only require a 2D optical flow vector, a dense flow field computed from a deep learning neural network contains redundant information. A feature extractor based on the Shi–Tomasi technique was used to extract only appropriate features from thermal images to compute optical flow. The state-of-the-art RAFT-s model was trained with a full image and with our proposed alternative input, showing a substantial increase in speed while maintain its accuracy in the presence of high thermal contrast where features could be detected.
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Dos Santos Junior, Carlito, Mariana Da Silva, Pedro Dos Santos, Rodrigo Rocha, Marco De Freitas e Anderson da Silva. "Image-based modelling of the effect of s-metolachlor plus atrazine on the soaking kinetics of maize seeds". International Agrophysics 36, n. 3 (29 giugno 2022): 155–61. http://dx.doi.org/10.31545/intagr/150341.
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Tibenský, Matúš, e Angela Handlovičová. "Convergence of the Numerical Scheme for Regularised Riemannian Mean Curvature Flow Equation". Tatra Mountains Mathematical Publications 72, n. 1 (1 dicembre 2018): 123–40. http://dx.doi.org/10.2478/tmmp-2018-0025.
Abstract (sommario):
Abstract The aim of the paper is to study problem of image segmentation and missing boundaries completion introduced in [Mikula, K.—Sarti, A.––Sgallarri, A.: Co-volume method for Riemannian mean curvature flow in subjective surfaces multiscale segmentation, Comput. Vis. Sci. 9 (2006), 23–31], [Mikula, K.—Sarti, A.—Sgallari, F.: Co-volume level set method in subjective surface based medical image segmentation, in: Handbook of Medical Image Analysis: Segmentation and Registration Models (J. Suri et al., eds.), Springer, New York, 583–626, 2005], [Mikula, K.—Ramarosy, N.: Semi-implicit finite volume scheme for solving nonlinear diffusion equations in image processing, Numer. Math. 89 (2001), 561–590] and [Tibenský, M.: VyužitieMetód Založených na Level Set Rovnici v Spracovaní Obrazu, Faculty of mathematics, physics and informatics, Comenius University, Bratislava, 2016]. We generalize approach presented in [Eymard, R.—Handlovičová, A.—Mikula, K.: Study of a finite volume scheme for regularised mean curvature flow level set equation, IMA J. Numer. Anal. 31 (2011), 813–846] and apply it in the field of image segmentation. The so called regularised Riemannian mean curvature flow equation is presented and the construction of the numerical scheme based on the finite volume method approach is explained. The principle of the level set, for the first time given in [Osher, S.—Sethian, J. A.: Fronts propagating with curvature-dependent speed: Algorithms based on Hamilton-Jacobi formulations, J. Comput. Phys. 79 (1988), 12–49] is used. Based on the ideas from [Eymard, R.—Handlovičová, A.– –Mikula, K.: Study of a finite volume scheme for regularised mean curvature flow level set equation, IMA J. Numer. Anal. 31 (2011), 813–846] we prove the stability estimates on the numerical solution and the uniqueness of the numerical solution. In the last section, there is a proof of the convergence of the numerical scheme to the weak solution of the regularised Riemannian mean curvature flow equation and the proof of the convergence of the approximation of the numerical gradient is mentioned as well.
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Szpygiel, Jędrzej, Maksymilian Chlipała, Rafał Kukołowicz, Moncy Idicula e Tomasz Kozacki. "Distortion correction for wide angle holographic projector". Photonics Letters of Poland 13, n. 4 (30 dicembre 2021): 79. http://dx.doi.org/10.4302/plp.v13i4.1125.
Abstract (sommario):
This letter presents distortion correction method enabling distortion minimized, large size image in wide angle holographic projector. The technique applies numerical predistortion of an input image used for hologram generation. It is based on estimation of distortion coefficients by comparing optically reconstructed point test chart with the original one. Obtained experimental results prove that the technique allows reconstruction of high-quality image. Full Text: PDF ReferencesM. Makowski, Experimental Aspects of Holographic Projection with a Liquid-Crystal-on-Silicon Spatial Light Modulator, in Holographic Materials and Optical Systems, M. Kumar, ed. (IntechOpen, 2019). CrossRef H. Pang, A. Cao, W. Liu, L. Shi, and Q. Deng, "Effective method for further magnifying the image in holographic projection under divergent light illumination", Appl. Opt. 58, 8713 (2019). CrossRef Y. Qi, C. Chang, and J. Xia, "Speckleless holographic display by complex modulation based on double-phase method", Opt. Express 24, 30368 (2016). CrossRef E. Buckley, "Holographic Laser Projection", J. Display Technol. 99, 1 (2010). DirectLink M. Chlipała, T. Kozacki, H. Yeom, J. Martinez-Carranza, R. Kukołowicz, J. Kim, J. Yang, J. Choi, J. Pi, and C. Hwang, "Wide angle holographic video projection display", Opt. Lett. 46, 4956 (2021). CrossRef Z. He, X. Sui, L. Cao and G. Jin, "Image-Distortion Correction Algorithm for Computer-Generated Holographic Display," 2018 IEEE 27th International Symposium on Industrial Electronics (ISIE), 1331 (2018). CrossRef A. Kaczorowski, G.S. Gordon, A. Palani, S. Czerniawski and T.D. Wilkinson, "Optimization-Based Adaptive Optical Correction for Holographic Projectors", J. Display Technol. 11(7), 596 (2015). CrossRef Z. He, X. Sui, G. Jin, L. Cao, "Distortion-Correction Method Based on Angular Spectrum Algorithm for Holographic Display", IEEE Trans. Industr. Inform. 15, 6162 (2019). CrossRef O. Mendoza-Yero, G. Mínguez-Vega, and J. Lancis, "Encoding complex fields by using a phase-only optical element", Opt. Lett. 39, 1740 (2014). CrossRef T. Kozacki, K. Falaggis, "Angular spectrum method with compact space–bandwidth: generalization and full-field accuracy", Appl. Opt. 55, 5014 (2016). CrossRef
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Ilanko, Tehnuka, Tom D. Pering, Thomas Charles Wilkes, Julia Woitischek, Roberto D’Aleo, Alessandro Aiuppa, Andrew J. S. McGonigle, Marie Edmonds e Esline Garaebiti. "Ultraviolet Camera Measurements of Passive and Explosive (Strombolian) Sulphur Dioxide Emissions at Yasur Volcano, Vanuatu". Remote Sensing 12, n. 17 (20 agosto 2020): 2703. http://dx.doi.org/10.3390/rs12172703.
Abstract (sommario):
Here, we present the first ultraviolet (UV) camera measurements of sulphur dioxide (SO2) flux from Yasur volcano, Vanuatu, for the period 6–9 July 2018. These data yield the first direct gas-measurement-derived calculations of explosion gas masses at Yasur. Yasur typically exhibits persistent passive gas release interspersed with frequent Strombolian explosions. We used compact forms of the “PiCam” Raspberry Pi UV camera system powered through solar panels to collect images. Our daily median SO2 fluxes ranged from 4 to 5.1 kg s−1, with a measurement uncertainty of −12.2% to +14.7%, including errors from the gas cell calibration drift, uncertainties in plume direction and distance, and errors from the plume velocity. This work highlights the use of particle image velocimetry (PIV) for plume velocity determination, which was preferred over the typically used cross-correlation and optical flow methods because of the ability to function over a variety of plume conditions. We calculated SO2 masses for Strombolian explosions ranging 8–81 kg (mean of 32 kg), which to our knowledge is the first budget of explosive gas masses from this target. Through the use of a simple statistical measure using the moving minimum, we estimated that passive degassing is the dominant mode of gas emission at Yasur, supplying an average of ~69% of the total gas released. Our work further highlights the utility of UV camera measurements in volcanology, and particularly the benefit of the multiple camera approach in error characterisation. This work also adds to our inventory of gas-based data, which can be used to characterise the spectrum of Strombolian activity across the globe.
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Ba, Qinle, Peng Yang e Jennifer Yearley. "660 Developing generalizable deep learning models for tumor segmentation in pathology images to enable the identification of predictive biomarkers for immunotherapies". Journal for ImmunoTherapy of Cancer 8, Suppl 3 (novembre 2020): A697. http://dx.doi.org/10.1136/jitc-2020-sitc2020.0660.
Abstract (sommario):
BackgroundDespite recent advances in cancer immunotherapies, their efficacies vary significantly among patients. To better understand the mechanisms of drug resistance, it is essential to characterize immune responses to immunotherapies in the tumor immune microenvironment (TME) from intact patient tissues. To this end, quantitative spatial immune profiling of pathology images has been the focus for many recent studies. Such analysis often depends critically on the automated image segmentation of tumor and stromal compartments. However, current segmentation approaches, even these based on deep learning, often fail to perform well when given datasets to segment, which differ from the data on which they were trained. Specifically, tissue segmentation models trained for one type of organ (source) face challenges in performance when applied directly to images of another organ type (target), even when the targeted regions to segment are highly similar in morphology between the source and target. Here, we present a segmentation approach to adapt knowledge learned from source data of one cancer type to unlabeled target data of another organ cancer type via unsupervised domain adaptation (UDA) frameworks. This research will help build deep learning models that significantly reduce the need for expert manual annotations.MethodsAnnotated colorectal cancer (CRC)1 (target domain) and prostate cancer (source domain)2 were used for tumor tissue segmentation model development, containing image tiles from 38 and 20 whole slide images, respectively. We compared the performance and robustness of four approaches. First, we implemented two output-space domain-adversarial based UDA’s. We then implemented a self-training-based approach. Additionally, we designed a two-stage UDA approach by first conducting self-training and then further aligning target domain features with category-anchors generated from source data after a first stage of self-training.ResultsDirectly applying a tumor tissue segmentation model trained on prostate cancer images (source) to CRC images (target) resulted in an intersection-over-union (IOU) score of 62.5%, which was 19% IOU lower (domain gap) than using a model trained on target data. Methods based on output-space domain adversarial training reduced the domain gap by up to 8% IOU, a performance result which was better than with self-training-based methods, which only reduced the domain gap by 4%. Both sets of approaches improved precision by 10%.ConclusionsWe demonstrate the feasibility of designing tumor segmentation models that are robust and generalizable to multiple indications. The UDA approaches have the potential to speed our understanding of factors influencing immunotherapy efficacy through automated annotation of tissue regions required.ReferencesGraham S, Chen H, Gamper J, Dou Q, Heng PA, Snead D, Tsang YW, Rajpoot N: MILD-Net: minimal information loss dilated network for quantitativegland instance segmentation in colon histology images. Medical image analysis 2019;52:199–211.Bulten W, Bándi P, Hoven J. et al. Epithelium segmentation using deep learning in H&E-stained prostate specimens with immunohistochemistry as reference standard. Sci Rep 2019;9, 864.
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Drouin, Emmanuel. "Radicalisation et « image de soi »". Annales Médico-psychologiques, revue psychiatrique 178, n. 10 (dicembre 2020): 977–79. http://dx.doi.org/10.1016/j.amp.2020.01.011.
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Sultana, Saki, e Kamrul Hasan Khosru. "Practice of using gifts as promotional materials for marketing of pharmaceutical products in Bangladesh: A survey conducted on general physicians and representatives from pharmaceutical companies". Stamford Journal of Pharmaceutical Sciences 4, n. 2 (21 aprile 2012): 13–18. http://dx.doi.org/10.3329/sjps.v4i2.10434.
Abstract (sommario):
The present study was undertaken to find out the promotional strategies followed by the pharmaceutical companies, attitudes and responses of physicians towards these promotional activities and influence of using gifts as promotional materials on the prescribing behavior of the physicians. In the study we found that most pharmaceutical companies believe that pharmaceuticals should be promoted by their quality and availability, not by any other promotional strategies. 84.62% pharmaceutical companies believe that gifts provided by them motivate the physicians to prescribe their products whereas 87% physicians admit that they consider the image of the company and quality of the product while prescribing. We also found that 50.5% physicians preferred information more rather than attractive gifts but only 11.77% pharmaceutical companies agreed with this statement. DOI: http://dx.doi.org/10.3329/sjps.v4i2.10434 S. J. Pharm. Sci. 4(2) 2011: 13-18
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Samat, Abdullah Abdul, Wan Nor Anasuhah Wan Yusoff, Nur Wardah Norman, Mahendra Rao Somalu e Nafisah Osman. "Powder and Electrical Properties of La0.6Sr0.4CoO3-δ Cathode Material Prepared by a Modified Sol-Gel Method for Solid Oxide Fuel Cell Application". Jurnal Kejuruteraan si1, n. 2 (30 novembre 2018): 49–57. http://dx.doi.org/10.17576/jkukm-2018-si1(2)-06.
Abstract (sommario):
The powder properties and electrical conductivity of lanthanum strontium cobalt oxide, La0.6Sr0.4CoO3-δ (LSC) material were systematically characterized with respect to application as cathode material for intermediate temperature solid oxide fuel cell (SOFC). The LSC was prepared via a modified sol-gel method assisted with a combination of ethylene glycol and activated carbon as a chemical additive. The decomposition of impurity compounds such carbon compounds and nitrates in the precursor powder was completed at 870 °C as revealed by thermogravimetry (TG) analysis. As the calcination temperature increased from 800 °C to 1000 °C, the purity and crystallite size of the the calcined precursor powder also increased as confirmed by X-ray diffrcation (XDR) analysis. The micrograph of scanning electron microscope (SEM) image showed that the particle of the calcined powders form agglomeration and this led to low relative density (80.18 %) of the sintered LSC pellet at 1200 °C. The direct current electrical conductivities (σdc) of the sintered LSC pellet measured using Van der Pauw technique in air were 1504 S cm-1 and 1069 S cm-1 at 400 °C and 800 °C, respectively. The relatively high σdc with low activation energy (Ea) of 0.021 eV indicates that the LSC prepared in this work has a great potential to be used as a cathode material for intermediate temperature SOFC application.
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Castro, F. M., M. J. Marín-Jiménez, N. Guil Mata e R. Muñoz-Salinas. "Fisher Motion Descriptor for Multiview Gait Recognition". International Journal of Pattern Recognition and Artificial Intelligence 31, n. 01 (gennaio 2017): 1756002. http://dx.doi.org/10.1142/s021800141756002x.
Abstract (sommario):
The goal of this paper is to identify individuals by analyzing their gait. Instead of using binary silhouettes as input data (as done in many previous works) we propose and evaluate the use of motion descriptors based on densely sampled short-term trajectories. We take advantage of state-of-the-art people detectors to define custom spatial configurations of the descriptors around the target person, obtaining a rich representation of the gait motion. The local motion features (described by the Divergence-Curl-Shear descriptor [M. Jain, H. Jegou and P. Bouthemy, Better exploiting motion for better action recognition, in Proc. IEEE Conf. Computer Vision Pattern Recognition (CVPR) (2013), pp. 2555–2562.]) extracted on the different spatial areas of the person are combined into a single high-level gait descriptor by using the Fisher Vector encoding [F. Perronnin, J. Sánchez and T. Mensink, Improving the Fisher kernel for large-scale image classification, in Proc. European Conf. Computer Vision (ECCV) (2010), pp. 143–156]. The proposed approach, coined Pyramidal Fisher Motion, is experimentally validated on ‘CASIA’ dataset [S. Yu, D. Tan and T. Tan, A framework for evaluating the effect of view angle, clothing and carrying condition on gait recognition, in Proc. Int. Conf. Pattern Recognition, Vol. 4 (2006), pp. 441–444]. (parts B and C), ‘TUM GAID’ dataset, [M. Hofmann, J. Geiger, S. Bachmann, B. Schuller and G. Rigoll, The TUM Gait from Audio, Image and Depth (GAID) database: Multimodal recognition of subjects and traits, J. Vis. Commun. Image Represent. 25(1) (2014) 195–206]. ‘CMU MoBo’ dataset [R. Gross and J. Shi, The CMU Motion of Body (MoBo) database, Technical Report CMU-RI-TR-01-18, Robotics Institute (2001)]. and the recent ‘AVA Multiview Gait’ dataset [D. López-Fernández, F. Madrid-Cuevas, A. Carmona-Poyato, M. Marín-Jiménez and R. Muñoz-Salinas, The AVA multi-view dataset for gait recognition, in Activity Monitoring by Multiple Distributed Sensing, Lecture Notes in Computer Science (Springer, 2014), pp. 26–39]. The results show that this new approach achieves state-of-the-art results in the problem of gait recognition, allowing to recognize walking people from diverse viewpoints on single and multiple camera setups, wearing different clothes, carrying bags, walking at diverse speeds and not limited to straight walking paths.
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Zivkovic, Snezana, Ljiljana Takic e Nenad Zivkovic. "The improvement of environmental performances by applying ISO 14001 standard: A case study". Chemical Industry and Chemical Engineering Quarterly 19, n. 4 (2013): 541–52. http://dx.doi.org/10.2298/ciceq120513088z.
Abstract (sommario):
This paper presents the analysis of the advantages of applying ISO 14001 system in an environmental protection management system. The environmental protection management system which is not licensed, i.e., compatible with the principles and standard pre-conditions considerably increases the plausibility for ecological risk. There are some issues that remain to be solved in the areas which are not expressed by financial values only but also have a non-financial character with the aim of expanding markets, company image improvement and improvement of the environmental performance indicators. By improving a company?s environmental management system efficiency we expect to achieve the minimization and elimination of damaging influences on the environment which are the consequence of company?s activities. A case study in the Oil Refinery Belgrade (RNB) analyses the implementation of the standard ISO 14001:2004 into its environment protection management system, particularly emphasizing the company?s own way of evaluating the environment aspects with the aim of establishing results of ecological performances indicators improvement. The average values of the first ecological indicator of the plant, the total amount of the waste waters in m3 per a ton of product, clearly show the downturn trend, which is confirmed by the proportional reduction of the second ecological plant indicator, that is by the flocculants consumption (Al2(SO4)3, Na2CO3) in kg per m3 of the waste water of the Oil Refinery of Belgrade for the given period 2008-2010. Case study RNB confirms the improvement of environmental performances using the ISO 14001 standard.