44 research outputs found
Supplemental Material - Exploring large-scale spatial distribution of fear of crime by integrating small sample surveys and massive street view images
No full textSupplemental Material for Exploring large-scale spatial distribution of fear of crime by integrating small sample surveys and massive street view images by Fengrui Jing, Lin Liu, Suhong Zhou, Zhenlong Li, Jiangyu Song, Linsen Wang, Ruofei Ma, and Xiaoming Li in Environment and Planning B: Urban Analytics and City Science</p
Airborne LiDAR Intensity Correction Based on a New Method for Incidence Angle Correction for Improving Land-Cover Classification
No full textThis article considers positional shift and rotation angle deviation of the laser scanner and the inertial measurement unit (IMU) and presents a new method for calculating the incident angle based on the rigorous geometric measurement model for airborne light detection and range (LiDAR)
Research on the Influence of Information Diffusion on the Transmission of the Novel Coronavirus (COVID-19)
No full textWith the rapid development of the Mobile Internet in China, epidemic information is real-time and holographic, and the role of information diffusion in epidemic control is increasingly prominent. At the same time, the publicity of all kinds of big data also provides the possibility to explore the impact of media information diffusion on disease transmission. We explored the mechanism of the influence of information diffusion on the transmission of COVID-19, developed a model of the interaction between information diffusion and disease transmission based on the Susceptible–Infected–Recovered (SIR) model, and conducted an empirical test by using econometric methods. The benchmark result showed that there was a significant negative correlation between the information diffusion and the transmission of COVID-19. The result of robust test showed that the diffusion of both epidemic information and protection information hindered the further transmission of the epidemic. Heterogeneity test results showed that the effect of epidemic information on the suppression of COVID-19 is more significant in cities with weak epidemic control capabilities and higher Internet development levels
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
Influence from highways on regional economic growth – based on the trade potential in China
No full textThe question of whether the construction of the highway network is economical and can produce positive economic benefits has been a hot topic of discussion in recent years. Previous scholars have explored the impact from multiple perspectives. Our paper draws the “trade potential” model proposed by Armstrong, based on the universal gravity model and the principle of space interaction, which is different from the traffic accessibility, market potential, and market access used in most of the literature. We argue that it is more appropriate to consider both the size impact and the time distance or trade cost impact of the two cities. The paper constructs a conceptual framework and theoretical model for the impact of highways on regional economic growth, measures the “minimum transit time” of highways between prefecture-level cities in China, and calculates the trade potential of prefecture-level cities. Through corresponding empirical model testing, we have obtained some meaningful conclusions.
First published online 17 September 202
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
Effects of school-based neuromuscular training on fundamental movement skills and physical fitness in children: a systematic review
No full textOBJECTIVES: The primary purpose of this review was to clarify the effects of school-based integrated neuromuscular training (INT) on fundamental movement skills and physical fitness in children. The secondary purpose was to examine whether school-based INT intervention is superior to physical education (PE) intervention in enhancing motor skills and fitness. METHODS: A systematic literature search was performed in four electronic databases: PubMed, Web of Science, MEDLINE (EBSCOhost), and Cochrane Central Register of Controlled Trials. The last search was performed on December 21, 2021, and was limited to the English language, human species, and peer reviewed journals. Randomized controlled trials and cluster randomized controlled trials that examine the effects of school-based INT on motor skills and/or fitness in healthy children who were aged up to 14 years old were included. Moreover, studies included in this study should compare school-based INT-induced adaptions with those generated by PE interventions. Studies that involve athletic children and additional exercise training were excluded. The Physiotherapy Evidence Database (PEDro) scale was used to assess the quality of the study. RESULTS: Of 1,026 studies identified, seven original trials that meet the inclusion criteria were included in this review. Based on the PEDro scale, the PEDro score of seven studies was between six and eight points with a mean score of 5.29. Among the seven studies included in this study, four studies assessed physical fitness including muscular fitness (n = 4), speed (n = 3), endurance (n = 2), and flexibility (n = 2). Three studies examined the effects of INT on postural control and three studies explored its effects on motor skills. Concerning movement competence, significant and greater improvements in postural control and fundamental motor skills were observed following school-based INT interventions compared to PE intervention in two and three studies, respectively. Regarding physical fitness, neuromuscular training significantly increased muscular fitness, speed, endurance, flexibility in three, two, one, and one studies, respectively. However, only greater improvements in muscle fitness were observed in school-based INT group compared to PE group. The main limitations of this review were the lack of descriptions of training intensity and volume and the low methodological quality of the included studies. CONCLUSION: This review provides evidence that school-based neuromuscular training programs are superior to PE lessons in improving postural control, fundamental motor skills and muscular strength. Therefore, INT could be incorporated into traditional physical education classes in school. Trial registration number: CRD42022297349
Sports Participation and Anti-Epidemic: Empirical Evidence on the Influence of Regular Physical Activity on the COVID-19 Pandemic in Mainland China
No full textThis study aims to investigate the effects and influencing mechanisms of regular physical activity (RPA) on the COVID-19 pandemic. Daily data from 279 prefecture-level cities in mainland China were collected from 1 January to 17 March 2020. A two-way fixed-effects model was used to identify the causal relationship between physical activity and COVID-19, while also considering factors such as patterns of human behavior and socioeconomic conditions. The instrumental variable (IV) approach was applied to address potential endogeneity issues for a more accurate causal identification, and the mediating effect model was applied to examine the mechanisms of the influence of physical activity on the epidemic. We found that regular physical activity significantly improves individual immunity, which, in turn, leads to a reduction in the probability of being infected with COVID-19. Furthermore, we investigated the heterogeneity of the influence, finding that the negative impact of physical activity on the pandemic is more pronounced in the absence of adequate medical resources, strong awareness of prevention among residents, and fully implemented public health measures. Our results provide empirical evidence for the mechanisms of influence of physical activity on the pandemic. We would suggest that not only should physical activity be actively practiced during the pandemic, but also long-term regular exercise habits should be consciously cultivated to improve the ability of the individual immune system to better cope with sudden outbreaks of emerging infectious diseases
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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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
