128 research outputs found
Modern Landscape Representation of Hakka Culture
No full textHakka culture is a combination of ancient Chinese culture, aboriginal southern culture and hilly environment, whose influence spreads more than 80 countries and regions in the world. It is more difficult to summarize the regional landscape representation techniques of Hakka culture under the background of modern landscape. The author makes a comparative study of landscape representation techniques of the three typical Hakka landscapes, putting forward modern landscape ideas of Hakka culture in order to provide reference for construction of other regional landscapes
Modern Landscape Representation of Hakka Culture
No full textHakka culture is a combination of ancient Chinese culture, aboriginal southern culture and hilly environment, whose influence spreads more than 80 countries and regions in the world. It is more difficult to summarize the regional landscape representation techniques of Hakka culture under the background of modern landscape. The author makes a comparative study of landscape representation techniques of the three typical Hakka landscapes, putting forward modern landscape ideas of Hakka culture in order to provide reference for construction of other regional landscapes
A bio-inspired and switchable H<sup>+</sup>/OH<sup>−</sup> ion-channel for room temperature exhaled CO<sub>2</sub> chemiresistive sensing
No full textInspired by the CO2-induced reversible activation mechanism of the slow anion channel 1 (SLAC1) in plant stomatal guard cells during plant photosynthesis, we designed and prepared a CO2- switchable H+/OH− ion channel (CSPH ion channel). A high-performance chemiresistive room temperature CO2 sensor has been prepared based on this CSPH ion channel. The obtained CO2 room temperature sensor γ-CD-MOF@RhB exhibits high sensitivity (Rg/R0 = 1.50, 100 ppm), excellent selectivity, good stability (less than 5% reduction in 30 days response value), and 99.96% consistency with commercial infrared CO2 meter. The practical limit of detection (pLOD) of the γ-CD-MOF@RhB sensor reaches 10 ppm at room temperature toward CO2, which is the lowest for reported MOF-derived chemiresistive room temperature CO2 sensors so far. Ion conduction mechanism studies have shown that the CSPH ion channel behaves as a CO2-switchable H+/OH− ion channel with a switching point of approximately 60 000 ppm CO2. As an application attempt, the fabricated low pLOD CO2 sensor has been used for human exhaled CO2 detection to compare CO2 concentration in the breath of individuals before and after exercise and COVID-19. It was also logically indicated that the average concentration of human exhaled CO2 after COVID-19 recovery is different for undiseased subjects.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Bio-Electronic
Voxel-Based Extraction and Classification of 3-D Pole-Like Objects From Mobile LiDAR Point Cloud Data
No full textThe digital mapping of road environment is an important task for road infrastructure inventory and urban planning. Automatic extraction and classification of pole-like objects can remarkably reduce mapping cost and enhance work efficiency. Therefore, this paper proposes a voxel-based method that automatically extracts and classifies three-dimensional (3-D) pole-like objects by analyzing the spatial characteristics of objects. First, a voxel-based shape recognition is conducted to generate a set of pole-like object candidates. Second, according to their isolation and vertical continuity, the pole-like objects are detected and individualized using the proposed circular model with an adaptive radius and the vertical region growing algorithm. Finally, several semantic rules, consisting of shape features and spatial topological relationships, are derived for further classifying the extracted pole-like objects into four categories (i.e., lamp posts, utility poles, tree trunks, and others). The proposed method was evaluated using three datasets from mobile LiDAR point cloud data. The experimental results demonstrate that the proposed method efficiently extracted the pole-like objects from the three datasets, with extraction rates of 85.3&#x0025;, 94.1&#x0025;, and 92.3&#x0025;. Moreover, the proposed method can achieve robust classification results, especially for classifying tree trunks.Optical and Laser Remote Sensin
Worldwide research trends of post-subarachnoid hemorrhage epilepsy from 1995 to 2024: a bibliometric analysis
No full textObjectiveThe present study aims to examine the current status, research hotspots, and trends of epilepsy following subarachnoid hemorrhage (SAH) by generating visual maps, and offering research directions and references in the field of post-SAH epilepsy.MethodsWe employed bibliometric methods using VOSviewer, Microsoft Excel, and SRplot to visually analyze data on post-SAH epilepsy from the Web of Science Core Collection (WoSCC). Analysis parameters included the number of papers (NP), countries/regions, institutions, authors, journals, and keywords, assessed through network mapping.ResultsOur analysis included 1,172 publications from 1995 to 2024. The annual NP showed a growing trend, with the United States contributing the highest NP (488) and demonstrating close collaborations with other countries/regions. Harvard University in the United States had the highest institutional output, with 62 papers. The most prolific author was Jan Claassen, with 35 publications, while Neurocritical Care was the journal with the highest NP (51). The primary disciplinary category was Clinical Neurology. Keywords such as ‘inflammation,’ ‘prevalence,’ and ‘delayed cerebral ischemia’ (DCI) emerged as recent research hotspots.ConclusionOver the past three decades, there has been a significant upward trend in the annual NP on post-SAH epilepsy. The United States has maintained a leading position in this field. Current research primarily focuses on the pathogenesis, with particular attention to ‘inflammation’ and ‘DCI’
Advances in measuring parameters of the air-void system in hardened concrete
No full textTo improve the freezing and thawing resistance of concrete, air bubbles are entrained and distributed evenly and closely. Evaluation of the parameters of the air-void system in hardened concrete is detailed in ASTM C457 “Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete.” Microscopical methods are used to determine traverse lengths of air voids, aggregates, and pastes on the polished surface of concrete samples. Since this manual measurement is time-consuming, tedious, and dependent on skills of operators, automated methods are preferred. This study recommends improvements to both the ASTM C457 test protocol and the metrics that are used to characterize the air void system.
A flatbed scanner is used to acquire a single high resolution image of the polished surface of a concrete sample. The concrete surface is polished and treated with phenolphthalein and orange powder to facilitate segmentation of air bubbles, paste and aggregate phases. The image is processed using ImageJ, Photoshop, and Matlab software. A three-phase image is generated with air, paste, and aggregate phases shown in white, gray, and black, respectively. Using the three-phase image, ASTM C457 parameters can be readily determined by computer.
To validate the new approach, six groups of concrete samples were examined in a “blind study.” The concrete samples were donated by CTLGroup which had previously evaluated the air void system using the standard ASTM C457 test method. A good agreement between the two methods was shown except in the case of samples with lightweight aggregates.
The mechanism of freezing and thawing damage is complicated and theories proposed by researchers cannot explain all the observations or establish a clear relationship between the spacing of air void, the freezing rate and the paste properties. In many respects, these theories complement each other. Air entrainment is effective and reliable to resist freezing and thawing for concrete designed for outside exposure in the cold climate. The structure of the air-void system is critical for the frost resistance of concrete and the spacing factor is one of the most significant parameters of the air-void system.
A new approach to spacing factor is developed in this study using two-dimensional images to provide better information than linear traverse or point count methods. The average distance of pastes to the nearest air void, the percentage of protected pastes, the area fraction of air voids, and the surface area of air voids are two-dimensional parameters which can be used to evaluate the freezing and thawing performance considering the physical properties and the mechanism of freezing of concrete. A comparative study is conducted between the two-dimensional parameters and the one-dimensional parameters in ASTM C457 and the advantages of the two-dimensional parameters are presented.Item withdrawn by Laura Spradlin ([email protected]) on 2014-04-29T17:55:35Z
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An unusual complication of ventriculoperitoneal shunt with bladder perforation and extrusion through the urethra orifice in an adult male patient
No full text船舶搭載カメラと機械学習を用いた海洋漂流ごみのモニタリング手法の構築に関する研究
No full text東京海洋大学博士(工学)東京海洋大学博士学位論文 2024年度(2024年9月) 応用環境システム学 課程博士 甲第714号指導教員: 内田圭一doctoral thesi
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