Urban air mobility (UAM) utilising novel transportation tools is gradually being recognised as a significant means to alleviate ground transportation pressures, vertiports which serve as pivotal nodes in UAM require efficient methods for assessing its operational capacity to develop an appropriate operational strategy and help to design vertiport ground infrastructure scientifically. This study proposes a multi-dimensional assessment method for the capacity of vertiports considering throughput and quality of service based on genetic algorithm (CEGA). The method comprehensively considers constraints such as unmanned aerial vehicle (UAV) safety separation, battery endurance, number of landing vertipads and UAV speed. The experimental results indicate that the vertiport with the scheduling algorithm proposed by this study has a larger capacity and experiences fewer delay than the vertiport with first-come-first-served (FCFS) algorithm when the vertiport has the same limited number of vertipads. Different proportions of UAVs significantly affect the quality of service and the degree of operation delays. The weights of vertiport throughput and customer satisfaction are the parameters that represent the importance of throughput and customer satisfaction in the objective function of the capacity assessment model. When the weights of throughput and customer satisfaction are set to 0.8 and 0.2 respectively, the performance of this optimisation model is optimal. This study provides a novel solution for capacity assessment and operation scheduling of vertiports, laying the foundation for improving the efficiency of UAM operations.

We introduce the L-series of weakly holomorphic modular forms using Laplace transforms and give their functional equations. We then determine converse theorems for vector-valued harmonic weak Maass forms, Jacobi forms, and elliptic modular forms of half-integral weight in Kohnen plus space.

Our article offers an in-depth account of the role of the transnational practices of collaboration, storytelling, and learning in the diffusion of rights-based climate litigation (RBCL). Drawing on semi-structured interviews, participant observation, and quantitative data, we trace how the performance of these practices by lawyers, litigants, communities, scholars, and NGOs have fostered and sustained the transnational generation, exchange, and flow of resources, relationships, narratives, and knowledge underlying the field of RBCL. We argue that all three practices have fostered the diffusion of RBCL by influencing the local determinants of legal mobilization through enabling, discursive, and relational pathways. Finally, we show that these practices have had structural effects that have shaped the ideas and identities of the practitioners in the field of RBCL. Over time, the discursive and relational dimensions of practices have given rise to and have been strengthened by the formation of multiple communities of practice. The emergence of distinct communities provides the possibility for deeper forms of socialization and acculturation among their members, but they also make conflict and competition between different communities more likely. Overall, our article emphasizes the importance of understanding legal mobilization for climate justice as a set of practices that are shaped by the transnational social-legal context in which they are performed.

This paper presents the radiocarbon context of the megalithic monument El Amarejo 1, situated in the corridor of Almansa in the southern region of La Meseta in Spain. The monument was constructed using small and medium-sized masonry, comprising a short corridor and two separate chambers in which burials were carried out. The results of the 14C analyses of each of the 11 individuals documented indicate that the monument was in use between approximately 1900 and 1200 cal BC. Bayesian modeling of the radiocarbon dates allows for the proposition of hypotheses regarding the construction, utilisation dynamics, and abandonment of the monument. The combination of these new data with the analysis of the 14C dating of other burials from the Bronze Age of La Mancha reveals a complex and heterogeneous panorama. The evidence presented and analyzed in this paper suggests that burial practices associated with fortified settlements and their domestic areas shared space and time with the construction of megalithic monuments located near settlements.

In 1962, Spain implemented significant banking law changes to boost competition. This study investigates their impact on provincial banking concentration from 1964 to 1975, utilising novel provincial-level private bank balance sheet data and including savings banks. Results show a substantial decline in concentration across most provinces. Panel data models identify the determinants of banking concentration: larger populations and higher gross domestic product per capita correlate with lower concentration, while agrarian-focused provinces exhibit higher concentration. The provincial financial sector’s structure also matters, with a higher number of branches and headquarters per capita associated with reduced banking concentration. These findings refine existing literature and provide new insights into the intricate relationship between banking concentration and regional economies in Spain.

Scholarly work in American politics has yet to confront one of the nation’s starkest inequalities: lethal violence. The risk falls disproportionately on Black Americans, but much like poverty and inequality, lethal violence is a broadly American problem that African Americans are disproportionately likely to experience. The lack of attention to life-threatening violence has limited our understanding of race, criminal justice, and the nature of the American state. We draw on work in American political development and racial politics to extend a racialized state failure framework for understanding the United States as a high-violence society. Life-threatening violence declined dramatically in the nineteenth century in countries where state building involved the integrated consolidation of centralized violence monopolization and universal male suffrage. Such efforts faltered in the US, however, and violence thrived. We argue that this racialized state failure is the result of two reinforcing features of American politics: anti-transformative racial orders and institutional fragmentation. Fragmentation has long provided opportunities for anti-transformative racial orders to limit national intervention in violence control and enfranchisement, even during critical junctures when institutions are less determinate, and actions by decision makers are more likely to generate change. We illustrate the disruption of state building by racial orders, which minimized the state’s capacity to delegitimize violent self-help during two critical junctures in the US: Reconstruction and the crime wave of the mid- to late twentieth century. The resulting institutional configuration, which we refer to as forced localism, reinforces the jurisdictional authority of highly constrained state and local institutions in violence attenuation. The consequence is exceptionally high rates of serious violence and a harsh and exclusionary criminal justice system, with Black Americans exceptionally vulnerable to both.

Thermally activated palygorskite and sepiolite clays are commonly used for the bleaching of edible oils and fats. However, their bleaching capacity can vary depending on physicochemical clay characteristics. The present study focused on the impact of thermally treated palygorskite and palygorskite-smectite clays on bleaching performance and showed a correlation between bleaching performance and the physicochemical characteristics of the clays. The mineralogical and chemical composition, along with certain physicochemical characteristics of thermally treated (heated at 300°C) palygorskite and palygorskite-smectite clays, were assessed for their effect on bleaching performance. The samples were collected from exploratory boreholes from four currently exploited clay deposits, namely Knidi, Pilori, Harami, and Velanida of the Upper Pliocene-Lower Pleistocene Ventzia Basin, west Macedonia, Greece. Palygorskite was formed diagenetically from smectite precursors of lateritic origin and deposited in a fluvial-palustrine environment. Clay minerals were characterized by X-ray diffraction (XRD), near-infrared spectroscopy (NIR), inductively coupled plasma optical emission spectrometry (ICP-OES) analysis, and gas porosimetry. The bleaching ability of the samples was evaluated by measuring the absorption of visible light through standard bleached rapeseed oil. Results revealed that the bleaching performance was superior in mixed palygorskite-smectite clays and was directly proportional to the palygorskite content and to both the apparent bulk density and external surface area of the clays. By contrast, bleaching ability was inversely proportional to the amount of non-clay minerals, but independent of the small variance in Al, Fe, and Mg contents of the clays or the octahedral composition of palygorskite. The presence of smectite in smaller amounts promoted to a small extent the efficiency of the palygorskite-rich clays from the Ventzia Basin.

Radiocarbon (14C) measurements on dissolved inorganic carbon (DIC) are a powerful tool to trace water masses and carbon cycling in the ocean. Existing methodologies to determine the 14C content of seawater DIC requires large volumes of sample (usually >100 mL) and specialized graphitization techniques to achieve the accuracy and precision needed for meaningful data interpretation. The advancement of the CO2 gas ionization accelerator mass spectrometry (AMS) technique today allows routine 14C measurements on small samples (<100 µgC) and may thus permit reducing the sample volumes needed to determine 14C content of seawater DIC to ∼2 mL. The proposed method utilizes the carbonate handling system (CHS), gas interface system (GIS) and MICADAS AMS, and provides good accuracy but reduced precision compared to established methods. Good accuracy is shown by comparing results for a marine in-house DIC standard and a DIC seawater profile from Antarctica between the proposed CHS-GIS-MICADAS approach and reference measurements conducted on the same material at established laboratories (ETH and NOSAMS). Further, two sedimentary porewater profiles from a fjord system in Svalbard are presented. Despite good agreement, the precision of the CHS-GIS-MICADAS approach is reduced, potentially limiting possible interpretations on seawater DIC. Nonetheless, the reduction of sample volumes proves particularly helpful to analyze porewater DIC from sediment cores, where sample material is notoriously limited, reduces the required amounts of toxic HgCl2 and simplifies expedition logistics.

Traditional bulky and complex control devices such as remote control and ground station cannot meet the requirement of fast and flexible control of unmanned aerial vehicles (UAVs) in complex environments. Therefore, a data glove based on multi-sensor fusion is designed in this paper. In order to achieve the goal of gesture control of UAVs, the method can accurately recognize various gestures and convert them into corresponding UAV control commands. First, the wireless data glove fuses flexible fiber optic sensors and inertial sensors to construct a gesture dataset. Then, the trained neural network model is deployed to the STM32 microcontroller-based data glove for real-time gesture recognition, in which the convolutional neural network-Attention mechanism (CNN-Attention) network is used for static gesture recognition, and the convolutional neural network-bidirectional long and short-term memory (CNN-Bi-LSTM) network is used for dynamic gesture recognition. Finally, the gestures are converted into control commands and sent to the vehicle terminal to control the UAV. Through the UAV simulation test on the simulation platform, the average recognition accuracy of 32 static gestures reaches 99.7%, and the average recognition accuracy of 13 dynamic gestures reaches 99.9%, which indicates that the system’s gesture recognition effect is perfect. The task test in the scene constructed in the real environment shows that the UAV can respond to the gestures quickly, and the method proposed in this paper can realize the real-time stable control of the UAV on the terminal side.

This dialogue between Prof Claire Colebrook (Pennsylvania State University) and Asijit Datta is based on an online discussion, “Ecology, Extinction, and Posthumanism” which took place on the 1st of August, 2020 during the raging days of the COVID-19 pandemic. The transcript echoes Colebrook’s sentiments that the ethical demands of the climate hazard or the imminent extinction cannot be addressed to a particular subject or ‘we’. The predominant tension is concealed in the idea of the human and its values. As humans, we refuse to ask whether there is a future where life continues with endless possibilities for us. For Colebrook, the inability to adopt such a stance emerges from the historical condition that we as language-beings have always been the ones to define life, the ones that are essentially racing towards extinction. Following the extinction experiments of Husserl and Bergson, Colebrook contends that only the death of the ethical and political subject can provide us with alternate modes of survival in this world. This conversation engages with issues like the COVID-19 pandemic, American politics, and post-apocalyptic cinema to arrive at an imagination that requires the annihilation of the human as we know it.

Examining group boundaries is instrumental to understanding intergroup relations, particularly differences in boundary drawing between prototypical and peripheral group members. Whether identity strength and prototypicality have an interactive effect on how group members draw boundaries has been underexplored. We also know less about how different Latinos are viewed, despite the group’s vast diversity. This paper takes up these questions and compares white and Black Americans’ views of Latinos as American. Strikingly, among all respondents, U.S. born Latinos are seen as less American when their parent is undocumented. The results suggest that Black Americans are driven by economic and political concerns and perceive greater commonality with more marginalized Latinos. Whites are driven by cultural concerns and prefer those who will not challenge their prototypicality. This illustrates a divergence in how Latinos are received among each group.

For an arbitrary ring A, we study the abelianization of the elementary group $\mathit{{\rm E}}_2(A)$. In particular, we show that for a commutative ring A there exists an exact sequence

\begin{equation*}{\rm K}_2(2,A)/{\rm C}(2,A) \rightarrow A/M \rightarrow \mathit{{\rm E}}_2(A)^{\rm ab} \rightarrow 1,\end{equation*}

where ${\rm C}(2,A)$ is the central subgroup of the Steinberg group $\mathit{{\rm St}}(2,A)$ generated by the Steinberg symbols and M is the additive subgroup of A generated by $x(a^2-1)$ and $3(b+1)(c+1)$, with $x\in A, a,b,c \in {A^\times}$.