1,721,958 research outputs found
Creating Your Own Participatory Mapping Project: A Guide
No full textThis tutorial helps geographers to create their own participatory mapping project. It offers a map demo and a detailed instruction on how to create it. This map demo enables its users to contribute their local knowledge by clicking on a map, inputting their information, and viewing their input represented as a red dot. Existing contributions can also be viewed in a similar manner on the map. While this minimum viable map only offers essential functionality, it can be tailored or expanded to suit different participatory mapping initiatives. This approach can be particularly beneficial for digital geographers who want to kick-start their own participatory mapping projects
fake images of urban landscape
No full textThis is a piece of fake imagery for testing purposes. They were created by a stable diffusion model
GeoAI collapse? Ethical implications of synthetic geospatial data use
No full textAs synthetic data become increasingly embedded in GeoAI workflows, the long-term risks of recursive training on AI-generated inputs remain insufficiently understood. This study introduces and empirically examines the concept of GeoAI collapse – a degenerative process in which repeated reliance on synthetic geospatial data leads to progressive performance degradation. Focusing on semantic segmentation of street-level imagery, we simulated multigenerational training cycles using a conditional generative adversarial network pix2pix. Results demonstrated substantial declines in both visual fidelity and quantitative performance metrics, with rare place-based features exhibiting near-total collapse by later generations. These findings reveal structural vulnerabilities in GeoAI pipelines and highlight the ethical risks posed by unscreened, synthetic data entering public geospatial datasets. Beyond technical degradation, the study situates these risks within a broader phenomenon of digital placelessness – the erosion of geographic specificity and contextual meaning as AI-generated representations progressively abstract the lived realities of place. To address these challenges, we propose provenance-aware evaluation protocols that emphasize resilience, spatial fairness, and transparency. This work calls for a critical reframing of synthetic data practices in GeoAI to safeguard the integrity of geographic knowledge production
Primulina guizhongensis (Gesneriaceae), a new species from Guangxi, China
No full textZhao, Bo, Pan, Bo, Zhang, Yang, Wen, Fang (2013): Primulina guizhongensis (Gesneriaceae), a new species from Guangxi, China. Phytotaxa 109 (1): 27-35, DOI: 10.11646/phytotaxa.109.1.3, URL: http://dx.doi.org/10.11646/phytotaxa.109.1.
Sliding-Mode Surface-Based Approximate Optimal Control for Uncertain Nonlinear Systems With Asymptotically Stable Critic Structure
No full textThis article develops a novel sliding-mode surface (SMS)-based approximate optimal control scheme for a large class of nonlinear systems affected by unknown mismatched perturbations. The observer-based perturbation estimation procedure is employed to establish the online updated value function. The solution to the Hamilton-Jacobi-Bellman equation is approximated by an SMS-based critic neural network whose weights error dynamics is designed to be asymptotically stable by nested update laws. The sliding-mode control strategy is combined with the approximate optimal control design procedure to obtain a faster control action. The stability is proved based on the Lyapunov's direct method. The simulation results show the effectiveness of the developed control scheme
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
FIGURE 2. Primulina guizhongensis. A in Primulina guizhongensis (Gesneriaceae), a new species from Guangxi, China
No full textFIGURE 2. Primulina guizhongensis. A, habitat; B, opened corolla for showing stamens and staminodes; C, calyx, pistil and stigma (Drawn by Qi Wei based on holotype).Published as part of Zhao, Bo, Pan, Bo, Zhang, Yang & Wen, Fang, 2013, Primulina guizhongensis (Gesneriaceae), a new species from Guangxi, China, pp. 27-35 in Phytotaxa 109 (1) on page 30, DOI: 10.11646/phytotaxa.109.1.3, http://zenodo.org/record/507869
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Fig. 5 in Diterpenoid alkaloids from Aconitum barbatum var. puberulum Ledeb
No full textFig. 5. Plausible biosynthetic pathway of barpubenines A-B (6–7).Published as part of Ablajan, Nurfida, Zhao, Bo, Zhao, Jiang-Yu, Wang, Bian-Lin, Sagdullaev, Sh.Sh. & Aisa, H. A., 2021, Diterpenoid alkaloids from Aconitum barbatum var. puberulum Ledeb, pp. 1-9 in Phytochemistry (112567) 181 on page 6, DOI: 10.1016/j.phytochem.2020.112567, http://zenodo.org/record/829113
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