bluuebunny/crossref_metadata_2025 huggingface dataset:
Hydrochemistry of High Fluoride Groundwater Terrain of Phagi Block, Jaipur District, Rajasthan, India with Special Emphasis on Fluoride Correlation with Different Ions and other Parameters
Authors: Yadav Sonam , Singh K.N. , Maanju S.K.
Published: June 2023

About 53% of groundwater samples collected for chemical analysis have shown fluoride value beyond maximum permissible limit of 1.5 mg/L. The hydro-chemical correlation of fluoride with different anions and cations present in the groundwater of Phagi block, Jaipur district, Rajasthan was established using SPSS software and it is found that there is positive correlation of F– with Na+ and negative correlation with Ca2+. Fluoride contents have strong positive correlation with pH (r = 0.337*) is significant at 0.05 level. The concentration of fluoride in groundwater of the study area is very high exceeding the limits prescribed by WHO and BIS, the highest value of F is being found in Harsuliya village which is 10.05 mg/l. Apart from this groundwater facies present in the study area has been computed and found in the decreasing order - Na - Cl > Mixed Ca - Na - HCO3 > Mixed Ca - Mg - Cl > Ca - HCO3 > Ca - Cl. The source of fluoride in the study area is mainly geogenic. Due to intake of groundwater high in fluoride, both dental and skeletal fluorosis is found in the local population of the study area.
Technology-Enhanced Learning in the Education of Oncology Medical Professionals: A Systematic Literature Review
Authors: Kulaksız Taibe , Steinbacher Jana , Kalz Marco
Published: June 2023

As cancer continues to be a significant global health challenge, the education of oncology professionals plays a crucial role in providing quality cancer care and achieving optimal patient outcomes. In order to meet the growing need for flexible, accessible, and effective training, this study examines the role of technology-enhanced learning (TEL) in the education of oncology medical professionals. Following the PRISMA guidelines, this systematic review included 34 articles published between 2012 and 2022 in EBSCO and PubMed databases. Findings reveal a diverse range of digital tools being used in oncology training, despite a shortage of advanced educational technologies and limited functional improvement compared to traditional instruction. Since the training primarily targeted at multiple professions in the medical expert role, with radiation oncologists being overrepresented, other oncology domains should be examined more thoroughly in the future, taking into account distinct professional abilities, e.g. communication, collaboration, and leadership skills with reference to the CanMEDS framework. Although the training programmes generally resulted in positive outcomes according to the Kirkpatrick evaluation model, experimental research designs were rather limited. Therefore, the substantial contribution and limitations of TEL in oncology education need to be clarified. Precise reporting of digital tools and instructional processes, as well as challenges encountered, is highly recommended to increase transparency and replicability. Research methodology in digital oncology education remains a major concern and should be addressed accordingly in future research.
Assessing the Regional Economic Ripple Effect of Flood Disasters Based on a Spatial Computable General Equilibrium Model Considering Traffic Disruptions
Authors: Yang Lijiao , Wang Xinge , Jiang Xinyu , Tatano Hirokazu
Published: June 2023

With growing regional economic integration, transportation systems have become critical to regional development and economic vitality but vulnerable to disasters. However, the regional economic ripple effect of a disaster is difficult to quantify accurately, especially considering the cumulated influence of traffic disruptions. This study explored integrating transportation system analysis with economic modeling to capture the regional economic ripple effect. A state-of-the-art spatial computable general equilibrium model is leveraged to simulate the operation of the economic system, and the marginal rate of transport cost is introduced to reflect traffic network damage post-disaster. The model is applied to the 50-year return period flood in 2020 in Hubei Province, China. The results show the following. First, when traffic disruption costs are considered, the total output loss of non-affected areas is 1.81 times than before, and non-negligible losses reach relatively remote zones of the country, such as the Northwest Comprehensive Economic Zone (36% of total ripple effects). Second, traffic disruptions have a significant hindering effect on regional trade activities, especially in the regional intermediate input—about three times more than before. The industries most sensitive to traffic disruptions were transportation, storage, and postal service (5 times), and processing and assembly manufacturing (4.4 times). Third, the longer the distance, the stronger traffic disruptions’ impact on interregional intermediate inputs. Thus, increasing investment in transportation infrastructure significantly contributes to mitigating disaster ripple effects and accelerating the process of industrial recovery in affected areas.
Indigenous Knowledge Systems in Africa: exclusion of students with disabilities in South African higher education
Authors: Ndlovu Sibonokuhle
Published: June 2023

While contemporary scholarship seeks to include Indigenous Knowledge Systems (IKS) into epistemology, to re-centre knowledge that has been placed in the periphery, in Africa largely and in South Africa specifically, construction of African Indigenous Knowledge (AIK) has shaped disability in negative ways, hence the exclusion of persons with disabilities in society. The article utilised a review of literature as a methodology to explore the ways in which negative AIK has been constructed, to frame disability negatively and to exclude students with disabilities in South African higher education. Decolonial theory informed the imperceptible underlying cause of negative AIK about disability. Ubuntu was viewed as an African philosophy that could bring back the being and humanness of those with disabilities. Incorporating African proverbs relating to tolerance of disability into the curriculum was proposed as the way in which positive AIK could be re-centred, to assist the inclusion of students with disabilities in families, communities and higher education. The article sought to contribute to the contemporary debate of placing IKS at the centre of epistemology in higher education. While a number of studies have focused on re-centering IKS in epistemology largely, few have looked at it from the perspective of re-centering the positive AIK, to include students with disabilities in higher education in the South African context.
A guided approach for utilizing concrete robotic 3D printing for the architecture, engineering, and construction industry
Authors: Cabibihan John-John , Gaballa Aya , Fadli Fodil , Irshidat Mohammad , Mahdi Elsadig , Biloria Nimish , Mansour Zeyad , Abdulrazak Houssam
Published: June 2023

The emerging field of robotic 3D printing offers practical alternatives to conventional building methods that are currently used in the Architecture, Engineering, and Construction (AEC) industry. Robotic 3D printing has many advantages over the conventional construction as it reduces human error, is relatively inexpensive, and opens the door to the creative complex designs while reducing the amount of expertise required to complete the construction process. At present, there is a shortage of resources offering guidance on how to utilize the available technology. Thus, it is often difficult for researchers and practitioners alike to find the right information and make informed decisions relative to their specific applications. In this paper, we provide such a resource by gathering data from previously constructed projects in the form of a categorical study, which paves the way for accessing the most recent information regarding the robotic 3D printing technology of interest. We illustrate the latest methods and techniques used in the field and describe the hardware used. We also use the resulting classification methods to present a decision-making workflow to streamline the process of selecting the most appropriate approach. We also examined and performed a detailed analysis on three case studies of prominent buildings that have been constructed using 3D printing technology. The categorical parameters were selected carefully to form a clear, informative distinction between the buildings. Printing method and motion type were the most important parameters when it comes to robotic 3D printing. A new database was created and demonstrated to elucidate the types of the additive manufacturing that can be used. By analyzing the data, we hope to facilitate the development of new structures as they relate to 3D printing in the AEC industry.
Attitudes of military personnel towards unmanned ground vehicles (UGV): a study of in-depth interview
Authors: Pekarev Janar
Published: June 2023

The increasing potential of unmanned systems promises massive changes in military tactics and enormous enhancements to army arsenals. However, these developments also raise many concerns for societies as the use of force could potentially be delegated to autonomous weapons systems (AWS) that could operate without meaningful involvement of the military chain of command. This paper [Article adapts from a collaborative research report of Estonian research group nr R-012 on the iMUGS (Integrated Modular Unmanned Ground System) project, funded by the EDIDP (European Defence Industrial Development Programme).] reports the findings of interviews with military personnel (n = 18), which were conducted to gauge their perceptions and attitudes towards UGVs and the transformation to autonomous weapons. The findings indicate that the patriotic mentality to fight for freedom is perceived as inconceivable for an AI because unmanned platforms can hardly ever be equipped with patriotical algorithms. However, participants agreed that AI-driven machines should be perceived as decision-making instruments at best, with the caveat that any discretion to use lethal force should not be delegated to the machine.
Imagining Europe
Authors: Larsen Signe Rehling
Published: June 2023

What can the cultural study of law tell us about the European Union (EU)? How can we study the European political imagination? This paper demonstrates that the European political imagination is both composite and multifaceted. It is structured not merely by EU law but also by the constitutional orders of the EU Member States. A cultural analysis of European law must therefore include the constitutional worldviews of the Member States. In the political imagination of most of the Member States, “Europe” plays an important symbolic role. Yet since the Member States are shaped by different ‘varieties of constitutionalism’, the meaning ascribed to “Europe” is not uniform. The study of the constitutional worldviews of the Member States, however, should not come at the expense of studying the European political imagination sustained by EU institutions. This political imagination is currently undergoing a transformation. EU authority is increasingly legitimized by appealing to the “the people of Europe” and there are calls for “European sovereignty.” This emerging European political imagination transcends the dominant view of the literature where Europe is understood as a space of “post-sovereignty.”
Political Theory and the Volunteer: Lessons from Kahn’s Ethnography of ‘Our Unhappy Politics’
Authors: Berger Benjamin L.
Published: June 2023

This article offers a reading of Paul Kahn’s Democracy in Our America that places this intimate “work of local political theory” in a central position in the landscape of his political thought. The article argues that the figure of the volunteer, as it appears in the volume, holds a space for love and meaning—and for political happiness—that secures for it a critical role in the system of beliefs and practices that sustain self-government in the United States. That framing draws the volunteer into relationship with Kahn’s thinking about the family, the veteran, and law. But it also means that the erosion of the volunteer spirit that Kahn traces in his own New England town of Killingworth, Connecticut, is best understood as the loss of the site of action that reflects a reaching for political meaning beyond self-interest and, with it, the loss of the possibility of self-government. Reading the volunteer as a powerful placeholder for the erotic at the heart of the political—and then tracing eros and happiness through Plato, Freud, and Arendt—this article reconstructs Kahn’s link between our unhappy lives and our unhappy politics.
Beyond Victimization: On the Lasting Relevance of Political Sacrifice
Authors: Goldoni Marco
Published: June 2023

The article thematizes the relevance of Paul Kahn’s conception of political sacrifice for contemporary constitutional studies. Kahn’s approach to political sacrifice is compared with another extremely influential theory of sacrifice, René Girard’s theory of sacrifice. The main aim is to show why Kahn’s view of sacrifice in constitutional orders escapes the logic of victimization that affects Girard’s seminal work, and it provides a better understanding of a political conception of modern constitutional orders. In the final section, the article shows that although Kahn’s version of political sacrifice is seen as the embodiment of the principle of sovereignty, it can be expanded beyond it.
Kahn in Luxembourg: A Prolegomena to the Cultural Study of EU Law
Authors: Mair Sabine
Published: June 2023

In the context of growing anxieties regarding the place and role of law in the future of the Europe Union (EU), this article reflects upon the extent to which Paul Kahn’s cultural study of law’s rule could be relevant for the place and role of EU law in these respects. Drawing upon Kahn’s monograph Making the Case: The Art of the Judicial Opinion, this article analyses the Laval judgment for these purposes, as one of the most controversial cases ever decided by the Court of Justice of the European Union (CJEU). On this basis, the article shows how the cultural analysis of law advanced by Kahn can help us to sharpen our sensibilities with regard to the deeper layers of moral and political meaning that EU law expounds and to thereby enable us to expand our horizons as well as conversations on the socio-political and economic composition of EU law. Yet this article also raises skepticism about the cultural study of EU law’s rule. Given the diverse cultural idiosyncrasies and traditions by which citizens of EU Member States live, it questions whether EU law can be assessed from the point of view of a collective identity believed to best persuade EU citizens of the authority of EU law.
Between Integration and the Rule of Law: EU Law’s Culture of Lawful Messianism
Authors: Marzal Toni
Published: June 2023

The present article seeks to identify the particular culture that undergirds the practice of EU law, by drawing from Paul Kahn’s Cultural Analysis of Law. It will do so by extracting from his work certain models for understanding the imaginative life of a political community, most importantly those of the rule of law and of political action, which in Kahn’s observation of American realities stand in competition to one another. This will lead us, first, to consider the particular place held by European integration, as a messianic project of collective transformation. While this might seem to structure the practice of EU law in a way that is consistent with Kahn’s description of political action, such a view, we will then submit, does not consider the particular place of law in the EU’s legal culture, as the very substance in which the European order appears incarnated, and which provides the impetus for much of its development. To account for these two dimensions in the political imaginary of the EU, it is argued that, unlike Kahn’s description of the American context, the rule of law and political action do not stand in tension with one another. Instead, the practice of EU law operates under an idiosyncratic frame of experience, which can be usefully associated to Robert Cover’s notion of “lawful messianism,” and which synthesizes key aspects of Kahn’s account of the rule of law and political action. Finally, to illustrate the operation of just that culture of lawful messianism and its persistence to this day, the article turns to the place of the rule of law as a “foundational value” of the European legal system and recent developments around this particular norm of EU law.
The Political Jurisprudence of Paul W. Kahn
Authors: Loughlin Martin
Published: June 2023

This article presents an account of the work of the American constitutional law scholar, Paul W. Kahn, by situating it within a European tradition of political jurisprudence. After introducing certain basic features of this school of political jurisprudence, it proceeds to examine and evaluate Kahn’s work relating to the political, the state, sovereignty, collective identity and constitution within the framework of that distinctive worldview.
The effects of boundary proximity on Kelvin–Helmholtz instability and turbulence
Authors: Liu Chih-Lun , Kaminski Alexis K. , Smyth William D.
Published: June 2023

Studies of Kelvin–Helmholtz (KH) instability have typically modelled the initial flow as an isolated shear layer. In geophysical cases, however, the instability often occurs near boundaries and may therefore be influenced by boundary proximity effects. Ensembles of direct numerical simulations are conducted to understand the effect of boundary proximity on the evolution of the instability and the resulting turbulence. Ensemble averages are used to reduce sensitivity to small variations in initial conditions. Both the transition to turbulence and the resulting turbulent mixing are modified when the shear layer is near a boundary: the time scales for the onset of instability and turbulence are longer, and the height of the KH billow is reduced. Subharmonic instability is suppressed by the boundary because phase lock is prevented due to the diverging phase speeds of the KH and subharmonic modes. In addition, the disruptive influence of three-dimensional secondary instabilities on pairing is more profound as the two events coincide more closely. When the shear layer is far from the boundary, the shear-aligned convective instability is dominant; however, secondary central-core instability takes over when the shear layer is close to the boundary, providing an alternate route for the transition to turbulence. Both the efficiency of the resulting mixing and the turbulent diffusivity are dramatically reduced by boundary proximity effects.
Misrecognitions of Victimhood: Discretionary Power of Street-level Bureaucrats in Humanitarian Visas
Authors: Goehrung Ryan , Castellano Rachel
Published: June 2023

Humanitarian visas provide one of few potential pathways to citizenship for foreign nationals victimized within the United States and are an important aspect of immigration law. Yet one form of humanitarian visas—T nonimmigrant status (T visa)—has received scant attention in the socio-legal studies literature. “T visas” were designed to aid survivors of human trafficking and, though the US government estimates that tens of thousands of individuals are trafficked in the United States every year, only 15 percent of the five thousand T visas available annually have been granted since the program’s inception in 2002. Why are T visas such an underutilized form of immigration relief? Drawing on twenty in-depth interviews with immigration lawyers, law enforcement personnel, and non-governmental organization service providers routinely involved in T visa applications, we find that the low rate of applications and approvals is driven by a combination of structural barriers and expansive discretion of key actors in the legal process to interpret and apply the law, which results in a narrow and often misinformed construction of victimhood. We add to the literature on the discretionary power of street-level bureaucrats to shape the law and determine how it is applied with considerable consequences for survivors of trafficking.
Weak weight-semi-greedy Markushevich bases
Authors: Berasategui Miguel , Lassalle Silvia
Published: June 2023

The main purpose of this paper is to study weight-semi-greedy Markushevich bases, and in particular, find conditions under which such bases are weight-almost greedy. In this context, we prove that, for a large class of weights, the two notions are equivalent. We also show that all weight semi-greedy bases are truncation quasi-greedy and weight-superdemocratic. In all of the above cases, we also bring to the context of weights the weak greedy and Chebyshev greedy algorithms—which are frequently studied in the literature on greedy approximation. In the course of our work, a new property arises naturally and its relation with squeeze symmetric and bidemocratic bases is given. In addition, we study some parameters involving the weak thresholding and Chebyshevian greedy algorithms. Finally, we give examples of conditional bases with some of the weighted greedy-type conditions we study.
Oil extraction and the changing dynamics of pastoral conflicts: a conjoint experiment in Turkana, Kenya
Authors: Kim Hye-Sung
Published: June 2023

Communities inhabiting the arid and semi-arid areas of eastern Africa have long suffered from and engaged in pastoral conflicts. However, since some countries in the region became oil producers, the conditions affecting pastoral conflicts have changed. This study examines how oil extraction may influence pastoral conflicts by using a survey experiment conducted in Turkana County, Kenya, on a sample of 801 respondents. The study finds that overall, respondents’ perceived risks of pastoral conflicts decrease when they are primed about the consequences of oil extraction leading to fundamental changes in pastoral livelihoods, such as an increase in employment opportunities in the oil sector and rapid social changes. The residents of Turkana view pastoral conflicts as customary as long as pastoralism continues and fundamental changes to pastoralism-based livelihoods originating from oil discovery and extraction may lead to a decrease in the pastoralist population engaging in pastoral conflicts.
Regional citizenship regimes from within: unpacking divergent perceptions of the ECOWAS citizenship regime
Authors: Weinrich Amalie Ravn
Published: June 2023

This paper explores the Economic Community of West African States’ (ECOWAS) citizenship regime by investigating the institutional perceptions of five departments of the ECOWAS Commission. Creating a citizenship regime has been a central objective of the organisation's institutional framework but previous research has refrained from examining its multiplicity. The paper uses the concept of citizenship regime consisting of the dimensions rights, access, belonging and responsibility mix as the conceptual lens and draws on institutional documents and primary data from interviews conducted at the ECOWAS Commission. The paper contributes to current debates in citizenship studies and African regionalism and the literature on supra-national citizenship building, regional integration and governance research in Africa and elsewhere. The empirical data show that movement is central to the ECOWAS citizenship regime, whether formulated in terms of a right, as a way to facilitate access, or a way to establish a sense of regional belonging.
Theta and alpha activity are differentially associated with physiological and rating scale measures of affective processing in adolescents with but not without ADHD
Authors: Takács Mária , Tóth Brigitta , Szalárdy Orsolya , Bunford Nóra
Published: June 2023

Although atypical theta and alpha activity may be biomarkers of attention-deficit/hyperactivity disorder (ADHD) outcomes such as atypical affective processing and attention, the exact nature of the relations of these characteristics is unknown. We examined in age- and sex-matched adolescents (N = 132; Mage = 14.944, years, SD = .802) with and without ADHD, whether resting state (RS) theta and alpha power or theta and alpha event-related synchronization (ERS) during affect regulation (1) differ between adolescents with and without ADHD; (2) are differentially associated with event-related potential (ERP) and parent- and self-report measures of affective processing and inattention, given ADHD status and sex, and (3) are differentially lateralized, given ADHD status and sex. Adolescents with ADHD exhibited lower RS frontal-midline alpha power than adolescents without ADHD. In adolescents with ADHD, right parietal theta ERS was positively associated with the ERP measure of elaborate affective/motivational processing and right parietal RS alpha power was negatively associated with self-reported positive affectivity. In adolescents without ADHD, associations were nonsignificant. There was no disassociation of theta and alpha activity with affective processing and inattention. Consistent with clinical impressions, the between-group difference in frontal-midline theta ERS was more marked in boys than girls.
On the size-Ramsey number of grids
Authors: Conlon David , Nenadov Rajko , Trujić Miloš
Published: June 2023

We show that the size-Ramsey number of the
$\sqrt{n} \times \sqrt{n}$
grid graph is
$O(n^{5/4})$
, improving a previous bound of
$n^{3/2 + o(1)}$
by Clemens, Miralaei, Reding, Schacht, and Taraz.
The artificial uterus: on the way to ectogenesis
Authors: Bulletti Francesco Maria , Sciorio Romualdo , Palagiano Antonio , Bulletti Carlo
Published: June 2023

The inability to support the growth and development of a mature fetus up to delivery results in significant human suffering. Current available solutions include adoption, surrogacy, and uterus transplantation. However, these options are subject to several ethical, religious, economic, social, and medical concerns. Ectogenesis is the process in which an embryo develops in an artificial uterus from implantation through to the delivery of a live infant. This current narrative review summarizes the state of recent research focused on human ectogenesis. First, a literature search was performed to identify published reports of previous experiments and devices used for embryo implantation in an extracorporeally perfused human uterus. Furthermore, studies fitting that aim were selected and critically evaluated. Results were synthesized, interpreted, and used to design a prospective strategy for future research. Therefore, this study suggests that full ectogenesis might be obtained using a computer-controlled system with extracorporeal blood perfusion provided by a digitally controlled heart–lung–kidney system. From a clinical perspective, patients who will derive significant benefits from this technology are mainly those women diagnosed with anatomical abnormalities of the uterus and those who have undergone previous hysterectomies, numerous abortions, and experienced premature birth. Ectogenesis is the complete development of an embryo in an artificial uterus. It represents the solutions for millions of women suffering from premature deliveries, and the inability to supply growth and development of embryos/fetuses in the womb. In the future, ectogenesis might replace uterine transplantation and surrogacy.
Knowledge-based Reasoning and Learning under Partial Observability in Ad Hoc Teamwork
Authors: DODAMPEGAMA HASRA , SRIDHARAN MOHAN
Published: June 2023

Ad hoc teamwork (AHT) refers to the problem of enabling an agent to collaborate with teammates without prior coordination. State of the art methods in AHT are data-driven, using a large labeled dataset of prior observations to model the behavior of other agent types and to determine the ad hoc agent’s behavior. These methods are computationally expensive, lack transparency, and make it difficult to adapt to previously unseen changes. Our recent work introduced an architecture that determined an ad hoc agent’s behavior based on non-monotonic logical reasoning with prior commonsense domain knowledge and models learned from limited examples to predict the behavior of other agents. This paper describes KAT, a knowledge-driven architecture for AHT that substantially expands our prior architecture’s capabilities to support: (a) online selection, adaptation, and learning of the behavior prediction models; and (b) collaboration with teammates in the presence of partial observability and limited communication. We illustrate and experimentally evaluate KAT’s capabilities in two simulated benchmark domains for multiagent collaboration: Fort Attack and Half Field Offense. We show that KAT’s performance is better than a purely knowledge-driven baseline, and comparable with or better than a state of the art data-driven baseline, particularly in the presence of limited training data, partial observability, and changes in team composition.
The Politicization of COVID-19 and Anti-Asian Racism in the United States: An Experimental Approach
Authors: Kim D.G.
Published: June 2023

The deadly outbreak of the COVID-19 pandemic has accompanied a worldwide surge in anti-Asian hate crimes and racial violence. In this paper, I experimentally assess the downstream effects of the health crisis on the racial attitudes of the American public. Survey respondents were randomly assigned to different messages about COVID-19 and its association with China and answered a battery of racial attitude questions, including a new measure of anti-Asian racial resentment. Across all outcome measures, I find null effects for both treatment messages, which suggests that racialized views toward Asians may be stable individual-level dispositions that have shaped American responses to the pandemic. Findings from this study have important implications for research on the far-reaching societal and political consequences of the pandemic in the United States and beyond.
Discharge, Groundwater Gradients, and Streambed Micro‐Topography Control the Temporal Dynamics of Transient Storage in a Headwater Reach
Authors: Bonanno Enrico , Blöschl Günter , Klaus Julian
Published: June 2023

Contradictory interpretations of transient storage modeling (TSM) results of past studies hamper the understanding of how hydrologic conditions control solute transport in streams. To address this issue, we conduct 30 instantaneous tracer experiments in the Weierbach stream, Luxembourg. Using an iterative modeling approach, we calibrate TSM parameters and assess their identifiability across various hydrologic conditions. Near‐stream groundwater monitoring wells and LIDAR scans of the streambed are used to evaluate the area of the hyporheic zone and of the submerged sediments for each experiment. Our findings show that increasing discharge enhances parameters interaction requiring more samples of TSM parameters to obtain identifiable results. Our results also indicate that transient storage at the study site is influenced by in‐stream and hyporheic exchange processes during low discharge, likely due to the hyporheic zone's large extent and the relatively low water level compared to the size of slate fragments on the streambed. However, as discharge increases, in‐stream storage zones become part of the advective channel and the lower localized stream water losses to the adjacent groundwater suggests a decrease of the hyporheic exchange on transient storage. The results obtained were utilized to generate a hydrograph for the study site illustrating the dynamic evolution of in‐stream and hyporheic storage with varying discharge, providing insights into the expected influence of different transient storage processes prior to tracer experiments. Overall, our study enhances the understanding of the role of the hyporheic area and in‐stream storage zones in transient storage and helps estimate TSM parameters more accurately.
Entangling motional atoms and an optical loop at ambient condition
Authors: Pang Xiao-Ling , Zhang Chao-Ni , Dou Jian-Peng , Li Hang , Yang Tian-Huai , Jin Xian-Min
Published: June 2023

The observation of quantum entanglement in macroscopic matters has implications in the fundamental studies of quantum mechanics, as well as the implementations of quantum information technologies, such as quantum communication, enhanced sensing, and distributed quantum computing. Here, we report the creation of the heralded entanglement between two different room-temperature quantum memories: a single-photon entangled state delocalized between motional atoms as a collective excitation and an all-optical loop as a flying qubit. The stored entangled state is subsequently retrieved and verified by measuring the nonclassical correlations, quantum interference, and concurrence of the mapped-out photons. Our results show that quantum entanglement can be sustained in macroscopic matters at ambient condition, which enriches the fundamental researches of the transition boundary between quantum and classical worlds. Also, it highlights the potential cooperation between atomic ensembles and all-optical loop as quantum nodes at ambient condition, bringing a significant step towards practical quantum networks.
Radiocarbon evidence for the stability of polar ocean overturning during the Holocene
Authors: Chen Tianyu , Robinson Laura F. , Li Tao , Burke Andrea , Zhang Xu , Stewart Joseph A. , White Nicky J. , Knowles Timothy D. J.
Published: June 2023

Proxy-based studies have linked the pre-industrial atmospheric $$p_{{\rm{CO}}_{2}}$$

p

CO

2

rise of ∼20 ppmv in the mid- to late Holocene to an inferred increase in the Southern Ocean overturning and associated biogeochemical changes. However, the history of polar ocean overturning and ventilation through the Holocene remains poorly constrained, leaving important gaps in the assessment of the feedbacks between changes in ocean circulation and the carbon cycle in a warm climate state. The deep-ocean radiocarbon content, which provides a measure of ventilation, responds to circulation changes on centennial to millennial time scales. Here we present absolutely dated deep-sea coral radiocarbon records from the Drake Passage, between South America and Antarctica, and Reykjanes Ridge, south of Iceland, over the Holocene. Our data suggest that ventilation in the Antarctic circumpolar waters and North Atlantic Deep Water is surprisingly invariant within proxy uncertainties at our sampling resolution. Our findings indicate that long-term, large-scale polar ocean overturning has not been disturbed to a level resolvable by radiocarbon and is probably not responsible for the millennial atmosphere $$p_{{\rm{CO}}_{2}}$$

p

CO

2

evolution through the Holocene. Instead, continuous nutrient and carbon redistribution within the water column following deglaciation, as well as changes in land organic carbon stock, might have regulated atmospheric CO2 budget during this period.
d-amino acids signal a stress-dependent run-away response in Vibrio cholerae
Authors: Irazoki Oihane , ter Beek Josy , Alvarez Laura , Mateus André , Colin Remy , Typas Athanasios , Savitski Mikhail M. , Sourjik Victor , Berntsson Ronnie P.-A. , Cava Felipe
Published: June 2023

To explore favourable niches while avoiding threats, many bacteria use a chemotaxis navigation system. Despite decades of studies on chemotaxis, most signals and sensory proteins are still unknown. Many bacterial species release d-amino acids to the environment; however, their function remains largely unrecognized. Here we reveal that d-arginine and d-lysine are chemotactic repellent signals for the cholera pathogen Vibrio cholerae. These d-amino acids are sensed by a single chemoreceptor MCPDRK co-transcribed with the racemase enzyme that synthesizes them under the control of the stress-response sigma factor RpoS. Structural characterization of this chemoreceptor bound to either d-arginine or d-lysine allowed us to pinpoint the residues defining its specificity. Interestingly, the specificity for these d-amino acids appears to be restricted to those MCPDRK orthologues transcriptionally linked to the racemase. Our results suggest that d-amino acids can shape the biodiversity and structure of complex microbial communities under adverse conditions.
Multiscale analysis of pangenomes enables improved representation of genomic diversity for repetitive and clinically relevant genes
Authors: Chin Chen-Shan , Behera Sairam , Khalak Asif , Sedlazeck Fritz J. , Sudmant Peter H. , Wagner Justin , Zook Justin M.
Published: June 2023

Advancements in sequencing technologies and assembly methods enable the regular production of high-quality genome assemblies characterizing complex regions. However, challenges remain in efficiently interpreting variation at various scales, from smaller tandem repeats to megabase rearrangements, across many human genomes. We present a PanGenome Research Tool Kit (PGR-TK) enabling analyses of complex pangenome structural and haplotype variation at multiple scales. We apply the graph decomposition methods in PGR-TK to the class II major histocompatibility complex demonstrating the importance of the human pangenome for analyzing complicated regions. Moreover, we investigate the Y-chromosome genes, DAZ1/DAZ2/DAZ3/DAZ4, of which structural variants have been linked to male infertility, and X-chromosome genes OPN1LW and OPN1MW linked to eye disorders. We further showcase PGR-TK across 395 complex repetitive medically important genes. This highlights the power of PGR-TK to resolve complex variation in regions of the genome that were previously too complex to analyze.
Kinematic coordinations capture learning during human–exoskeleton interaction
Authors: Ghonasgi Keya , Mirsky Reuth , Bhargava Nisha , Haith Adrian M. , Stone Peter , Deshpande Ashish D.
Published: June 2023

Human–exoskeleton interactions have the potential to bring about changes in human behavior for physical rehabilitation or skill augmentation. Despite significant advances in the design and control of these robots, their application to human training remains limited. The key obstacles to the design of such training paradigms are the prediction of human–exoskeleton interaction effects and the selection of interaction control to affect human behavior. In this article, we present a method to elucidate behavioral changes in the human–exoskeleton system and identify expert behaviors correlated with a task goal. Specifically, we observe the joint coordinations of the robot, also referred to as kinematic coordination behaviors, that emerge from human–exoskeleton interaction during learning. We demonstrate the use of kinematic coordination behaviors with two task domains through a set of three human-subject studies. We find that participants (1) learn novel tasks within the exoskeleton environment, (2) demonstrate similarity of coordination during successful movements within participants, (3) learn to leverage these coordination behaviors to maximize success within participants, and (4) tend to converge to similar coordinations for a given task strategy across participants. At a high level, we identify task-specific joint coordinations that are used by different experts for a given task goal. These coordinations can be quantified by observing experts and the similarity to these coordinations can act as a measure of learning over the course of training for novices. The observed expert coordinations may further be used in the design of adaptive robot interactions aimed at teaching a participant the expert behaviors.
Lectin histochemistry of posterior lingual glands of developing rats
Authors: Harada Kazuma , Miki Koji , Tanaka Susumu , Kogo Mikihiko , Wakisaka Satoshi
Published: June 2023

The posterior lingual glands are classified as Weber and von Ebner glands. Glycans play an important role in salivary glands. Although the distribution of glycans can explain functional diversity and variation, there are many unknowns in the developing rat posterior lingual glands. The purpose of this study was to elucidate the relationship between the development and function of the posterior lingual gland in rats by histochemical analysis using lectins that bind to sugar residues. In adult rats, Arachis hypogaea (PNA), Glycine maximus (SBA), and Triticum vulgaris (WGA) were associated with serous cells and Dolichos biflorus (DBA) with mucous cells. In both Weber's and von Ebner's glands, all 4 lectins were bound to serous cells in early development, but as development progressed, DBA disappeared in serous cells and only the DBA remained in mucous cells. These results suggest that Galβ (1,3) > Galβ(1,4) > Gal, αGalNAc > αGal > βGalNAc, NeuAc > (GalNAc)2–3>>>GlcNAc, and GalNAcα(1,3) are present in the early stage of development, but that GalNAcα(1,3) disappear in serous cells and only GalNAcα(1,3) are localized in mucous cells after maturation. These results indicate that Weber glands function as serous glands in the early postnatal stage when von Ebner glands have not matured.
Effect of mineralogical variations on physico-mechanical and thermal properties of granitic rocks
Authors: Lasheen El Saeed R. , Rashwan Mohammed A. , Azer Mokhles K.
Published: June 2023

The present study aims to explain the geochemical and mineralogical details of the granitic rock types in Gabal EL-Faliq area, South Eastern Desert of Egypt, in relation to geotechnical engineering and their suitability as dimension stones. The objective of the current research was achieved through two steps; the first step involved geological studies such as the petrographic, geochemical, and mineralogical investigations. The second and applicable step involved the geotechnical assessment of the studied rocks by measuring their engineering properties such as physical, mechanical, and thermal expansion properties. The petrographic investigation revealed that the studied granitic rocks are divided into two main classes: (1) gneissose granites (Biotite–Perthite) of medium to fine-grained size and (2) alkali-feldspar granites of coarse to medium-grained size. Mineralogically, the studied rocks are composed mainly of albite, orthoclase and quartz in varying proportions, along with some accessory minerals such as apatite and rutile in addition to some minor quantities of iron-group minerals such as hematite and ilmenite. The engineering properties showed that the maximum water absorption and apparent porosity values are 0.34% and 0.77%, respectively, while the minimum bulk density is 2604.03 kg/m3. The compressive strength ranges from 999.68 to 2469.10 kg/cm2, while the abrasion resistance varies from 29.67 to 54.64 Ha. The increase in albite content led to an increase in water absorption while a decrease in bulk density and compressive strength. The increase in the grain size led to an increase in apparent porosity and a decrease in mechanical properties. A Great variation in the expansion coefficient as well as the length change, occurs under changes in temperature, mineral composition, and physical properties. The increase in heating temperatures caused an insignificant increase in linear thermal expansion with a maximum value of 0.0385% at 100 °C. These results indicated the suitability of the studied granites as dimension stones for use in indoor and outdoor decorative purposes (cladding/paving) under variable temperature conditions.
Exploring room temperature spin transport under band gap opening in bilayer graphene
Authors: Anderson Christopher R. , Natera-Cordero Noel , Guarochico-Moreira Victor H. , Grigorieva Irina V. , Vera-Marun Ivan J.
Published: June 2023

We study the room-temperature electrical control of charge and spin transport in high-quality bilayer graphene, fully encapsulated with hBN and contacted via 1D spin injectors. We show that spin transport in this device architecture is measurable at room temperature and its spin transport parameters can be modulated by opening of a band gap via a perpendicular displacement field. The modulation of the spin current is dominated by the control of the spin relaxation time with displacement field, demonstrating the basic operation of a spin-based field-effect transistor.
Gravitational friction from d’Alembert’s principle
Authors: Ortiz C. , Khatiwada Raju S.
Published: June 2023

The least action principle played a central role in the development of modern physics. A major drawback of the principle is that its applicability is limited to holonomic constraints. In the present work, we investigate the energy lost by particles as a result of the gravitational interaction in a homogeneous low-density medium subject to non-holonomic constraints. We perform the calculation for an arbitrary particle and outline the specific result for photons. The energy lost is calculated from first principles based on the principle of virtual work and the d’Alembert principle. Under the formalism mentioned above, the dissipative nature of the effect is established. Furthermore, we show that the results agree with an alternative derivation based on continuum mechanics and the Euler–Cauchy stress principle.
Early Dalmatian farmers specialized in sheep husbandry
Authors: Sierra A. , Balasse M. , Radović S. , Orton D. , Fiorillo D. , Presslee S.
Published: June 2023

The spread of farming in the central and western Mediterranean took place rapidly, linked to the Impressa Ware. The Impressa Ware originated somewhere in the southern Adriatic and spread westwards across the Mediterranean. These early farmers had an economy based on cereal agriculture and caprine husbandry, but there is still little information on how this agropastoral system functioned. This study aims to unravel the farming practices of the early Dalmatian farmers linked to the Impressa culture by using an integrated analysis, combining archaeozoology, palaeoproteomics and stable isotopes, applied to the faunal assemblages of Tinj-Podlivade and Crno Vrilo. The results show: (1) the composition of the flocks was overwhelmingly sheep; (2) sheep exploitation at both sites was similar, focusing on milk and meat; (3) sheep reproduction was concentrated at the beginning of winter, with no reproduction in autumn as in later sites in the western Mediterranean. We conclude that a common animal economy existed at both sites, which could be related to the mobility practiced by these early farming societies throughout the Mediterranean.
Unconventional hidden Rashba effects in two-dimensional InTe
Authors: Lee Sangmin , Kim Miyoung , Kwon Young-Kyun
Published: June 2023

Much attention has been paid to the hidden Rashba effect exhibiting an intriguing spin-layer locking phenomenon observed in two-dimensional materials with inversion symmetry. This effect provides a new possibility for manipulating Rashba spin polarization even in centrosymmetric materials. We propose a mechanism exhibiting an unconventional hidden Rashba effect showing a unique helical spin texture in which two Fermi circles in different bands have the same spin helicity exhibiting a complete spin separation in space. We demonstrate such an unconventional hidden Rashba effect by showing the unique electronic structures of two-dimensional InTe with inversion symmetry investigated by the first-principles calculations. It is found that spins in both the inner and outer bands with the one helicity are located in the top sublayer whereas spins with the other helicity are in the bottom sublayer indicating a complete spatial spin separation. Strong spin-orbit coupling and a band inversion among two pairs of spin-degenerate bands are the main origins for the unconventional hidden Rashba involving two pairs of spin-degenerate bands rather than one pair, which gets usually involved in the conventional (hidden) Rashba effects. This new type of the hidden Rashba effect observed in two-dimensional InTe would broaden our understanding of the underlying physics of spin polarization phenomena eventually leading to a potential application in future spintronics.