bluuebunny/crossref_metadata_2025_split huggingface dataset:
Seeing higher-dimensional grand unification in primordial non-gaussianities
Authors: Kumar Soubhik , Sundrum Raman 
Published: April 2019

AbstractThe observed low-energy values of the SU(3) × SU(2) × U(1) gauge couplings, extrapolated via the minimal Standard Model Renormalization Group evolution, hint at the exciting possibility of a Grand Unified Theory (GUT) atMU∼ 1014GeV — a scale, however, too high to probe directly via collider searches. Fortunately, since the Hubble scaleHcan be as high as 5 × 1013GeV ∼MUduring the inflationary era, such GUT scale states can be cosmologically produced at that time and leave directon-shellsignatures such as their masses and spins, via primordial non-Gaussianity (NG). We explore this possibility in one of its simplest realizations given by the extra-dimensional framework of orbifold GUTs, in which proton decay can be straightforwardly suppressed to be within the stringent bounds. Here, along with the massive GUT states there must also beH-mass spin-2 Kaluza-Klein (KK) gravitons, collectively giving rise to striking NG signatures. In our set-up we localize the inflaton on one of the boundaries of an extra dimension. The inflationary vacuum energy can readily lead to formation of a horizon in the bulk, where the KK modes then form acontinuumabove a mass gap of ∼$$ \mathcal{O} $$O(H). We find that the optimal case for observable NG signals is when the extra dimension is stabilized close to the onset of this horizon, ensuring adiscreteKK spectrum such that the lightest KK modes can be cosmologically produced without significant Boltzmann suppressions. Although we mostly focus on the case where there is no higher-dimensional cosmological constant, we also obtain considerable holographic insights from the AdS5/CFT4correspondence when such a cosmological constant is included.
Uterine Artery Embolization and Methotrexate Infusion as Sole Management for Caesarean Scar and Cervical Ectopic Pregnancies: A Single-Center Experience and Literature Review
Authors: Elmokadem Ali H. , Abdel-Wahab Rihame M. , El-Zayadi Ahmed A. , Elrakhawy Mohamed M. 
Published: April 2019

Introduction The incidence of caesarean scar pregnancy (CSP) and cervical pregnancy (CP) has increased significantly in recent years. The related hemorrhage can be lethal and often needs hysterectomy. This study aims to assess the technical and clinical results of uterine artery embolization (UAE) combined with intra-arterial methotrexate (MTX) infusion for CSP and CP. Methods A retrospective study was conducted for 11 patients (age range from 25–40 years, mean; 31.8 y) with CSP (7/11) and CP (4/11). The diagnosis was confirmed by elevated b-hCG levels (mean 31.245 mIU/mL) with sonography and/or magnetic resonance imaging. They were treated with UAE using particulate embolic material. In all patients, the infusion of MTX (50 mg/m2) was performed before UAE. Follow-up periods after UAE ranged between 6-24 months included weekly sonography and b-hCG level assessment. A literature review was performed using standard online search tools. Results In 10 patients, UAE controlled active vaginal bleeding and reduced post-procedural b-hCG levels significantly by the second week. One patient presented with persistent elevated b-hCG level and vaginal rebleeding. The rebleeding was successfully controlled by second UAE procedure. The ectopic pregnancies were resolved, and the uterus was preserved in all patients. No major complications were detected. Normal menses resumed within 2 months after UAE. Two patients had subsequent natural successful intrauterine pregnancies. Conclusion UAE combined with intra-arterial MTX infusion resulted in resolution of ectopic pregnancies with control of hemorrhage and without hysterectomy in this small group of patients.
On Principals and Agency: Reassembling Trust in Indian Ocean Commerce
Authors: Mathew Johan 
Published: April 2019

AbstractThe role of trust in long-distance trade has been a topic of inquiry and debate among economists, sociologists, and historians. Much of this literature hinges on the social, legal, and economic structures that undergird, if not obviate, the concept of trust. This article draws on assemblage theory to suggest that trust in Indian Ocean trade is better understood as a key component of a commercial assemblage. Laws or social mores are not external to but rather enrolled within an assemblage constituted by people, commodities, profits, and “feelings,” as well as judicial systems. This conceptualization of trust is demonstrated through a close analysis of one trading relationship between a Somali merchant and an Indian merchant based in Aden and trading in the Idrisi Emirate of Asir. They established a partnership to exploit elevated prices in Asir during the First World War. After several months of trading, accusations of fraud and embezzling unraveled the partnership and entangled both men in years of legal battles. By tracing the changing socio-material assemblage of this partnership, the article demonstrates how trust should be understood as a dynamic and contingent factor in the operation of commercial agency.
Fugitives, Vagrants, and Found Dead Bodies: Identifying the Individual in Tsarist Russia
Authors: Smith Alison K. 
Published: April 2019

AbstractIn the middle of the nineteenth century, in the Russian Empire, a new set of state-sponsored provincial newspapers began to include notices seeking fugitives and trying to identify arrested vagrants and found dead bodies. The notices were part of a larger effort to match individuals with specific legal identities based in social estate (soslovie). In principle, every individual subject of the Russian Empire belonged to a specific owner (in the case of serfs) or to a specificsosloviesociety (in the case of nearly everyone else). The notices were an effort to link people who had left their proper place to their “real” identity. To accomplish this, the notices also made use of a kind of simple biometrics or anthropometrics in order to move beyond an individual's telling of his or her own identity. By listing height, hair and eye color, the shape of nose, mouth, and chin, and other identifying features, the notices were intended to allow for more exact identification. This version of identification developed out of previous practices grounded in the documentary requirements of the tsarist state, and they were slightly ahead of their time in the context of nineteenth-century developments in the sphere of identification practices. They were also distinct from other kinds of anthropometric practices of classification developed at the same time or soon thereafter—where many sought to use physical measurements to classify people by race or by inclination to criminality, the Russian system had no such goals.
Pedagogies of Prayer: Teaching Orthodoxy in South India
Authors: Naumescu Vlad 
Published: April 2019

AbstractThis article focuses on religious pedagogies as an essential part of the practice and the making of modern religion. It takes the case of the Syrian Orthodox communities in Kerala, South India to examine how shifts in pedagogical models and practice have reframed their understanding of knowledge and God. The paper highlights two moments of transformation—the nineteenth-century missionary reforms and twenty-first-century Sunday school reforms—that brought “old” and “new” pedagogies into conflict, redefining the modes of knowing and religious subjectivities they presuppose. For this I draw from historical and pedagogical materials, and ethnographic fieldwork in churches and Sunday schools. The paper diverges from widespread narratives on the missionary encounter by showing how colonial efforts to replace ritual pedagogies with modern schooling were channeled into a textbook culture that remained close to Orthodox ritualism. The “new” pedagogy turned learning into a ritualized practice that continued to emphasize correct performance over interiorized belief. Contrasting this with todays’ curriculum revisions, I argue that educational reforms remain a privileged mode of infusing new meanings into religious practice and shaping new orthodoxies, especially under the threat of heterodoxy. This reflects a broader dynamic within Orthodox Christianity that takes moments of crisis or change as opportunities to turn orthopraxy into orthodoxy and renew the faith. The paper engages with postcolonial debates on religion, education, and modernity, and points to more pervasive assumptions about what makes Orthodox Christianity and the modes of knowing and ethical formation in Eastern Christianity.
Archived Voices, Acoustic Traces, and the Reverberations of Kurdish History in Modern Turkey
Authors: Schäfers Marlene 
Published: April 2019

AbstractThis article investigates how middle-aged to elderly Kurdish women in Turkey engage with large collections of Kurdish music recordings in their possession. Framing them as archives, women mobilize these collections as central elements in a larger, ongoing Kurdish project of historical critique, which seeks to resist hegemonic state narratives that have long denied and marginalized Kurdish voices. While recognizing the critical intervention such archives make, the article contends that, to be heard as “history” with a legitimate claim to authority, subaltern voices often have to rely on the very hegemonic forms, genres, and discourses they set out to challenge. This means that subaltern projects of historical critique walk a fine line between critique and complicity, an insight that nuances narratives that would approach subaltern voices predominantly from a perspective of resistance. At the same time, this article argues that a more complete picture of subaltern archives requires us to attend to the voices they contain not just as metaphors for resistance or political representation but also as acoustic objects that have social effects because of the way they sound. By outlining the affective qualities that voice recordings held for the Kurdish women who archived them, the article shows how their collections participated in carving out specific, gendered subject positions as well as forging a broader Kurdish sociality. Paying attention to history's “acoustic register” (Hunt 2008), this suggests, promises to open up perspectives on subaltern historiography that go beyond binary frameworks of resistance and domination, critique and complicity.
Sensitivity to hypoxia and microbial activity are instrumental in pericarp-imposed dormancy expression in sunflower (Helianthus annuus L.)
Authors: Dominguez Constanza P. , Rodríguez María V. , Batlla Diego , García de Salamone Inés E. , Mantese Anita I. , Andreani Ana L. , Benech-Arnold Roberto L. 
Published: April 2019

AbstractWe used two sunflower genotypes displaying pericarp-imposed dormancy at high incubation temperatures (i.e. 30°C) to investigate the role of the pericarp as a limitation to oxygen availability to the embryo (hypoxia), and its impact on embryo abscisic acid (ABA) content and sensitivity to ABA. Results showed that both genotypes displayed very different oxygen threshold values for inhibition of embryo germination when incubation was performed at 30°C. Expression of dormancy in one genotype was therefore related to exacerbated embryo sensitivity to hypoxia, whereas in the other genotype, the pericarp appeared to act as a more severe restraint to oxygen entry. Increased sensitivity to hypoxia was, in part, related to increased sensitivity to ABA, but not to alterations in ABA metabolism. The activity of pericarp-microbial communities (bacteria and fungi) at high temperatures was also assessed as a potential determinant of hypoxia to the embryo. Oxygen consumption in pericarps incubated at 30°C was attenuated with antibiotics, which concomitantly promoted achene germination. In agreement with the observed more severe oxygen deprivation to the embryo exerted by the pericarp, the bacterial load in the pericarp was significantly higher in the commercial hybrid than in the inbred line; however, the application of antibiotics strongly reduced the bacterial colony counts for each genotype. Different bacterial and fungal communities, assessed through their profiles of carbon-source utilization, were determined between genotypes and after treatment with antibiotics. This work highlights the relationship between enhancement of sensitivity to hypoxia with incubation temperature and seed dormancy expression, and suggests that microbial activity might be part of the mechanism through which hypoxia is imposed.
The Subtropical Ocean's Biological Carbon Pump Determined From O2 and DIC/DI13C Tracers
Authors: Yang Bo , Emerson Steven R. , Quay Paul D. 
Published: April 2019

AbstractThe ocean's biological organic carbon pump regulates the pCO2 of the atmosphere and helps maintain the oxygen distributions in the ocean. Global models of this flux are poorly verified with observations. We used upper‐ocean budgets of O2 and the 13C/12C of dissolved inorganic carbon (DIC) to estimate the biological pump in the subtropical gyres. These two tracers yield, within errors, similar result (~2.0 mol C·m−2·year−1) at three Northern Hemisphere subtropical locations. Values for three Southern Hemisphere subtropical regions are lower and more variable determined by the O2 mass balance than by the DI13C method (−0.5 to 0.8 mol C·m−2·year−1 and 0.9 to 1.3 mol C·m−2·year−1, respectively). Both methods suggest that the subtropical ocean is, on the whole, autotropic. The gas exchange residence times of O2 and dissolved inorganic carbon result in different spatial and temporal averaging creating complementary tracers for biological pump model verification.
Seismic Moments of Intermediate‐Depth Earthquakes Beneath the Hindu Kush: Active Stretching of a Blob of Sinking Thickened Mantle Lithosphere?
Authors: Molnar Peter , Bendick Rebecca 
Published: April 2019

AbstractIntermediate‐depth seismicity beneath the Hindu Kush may reveal the Earth's best example of a stretching blob of mantle lithosphere sinking through the asthenosphere. Seismically, this region is the Earth's most active at intermediate depths (70–300 km). Fault plane solutions show nearly vertical stretching of the region in which the earthquakes occur, and a summation of seismic moment tensors implies that on average material at a depth of 300 km moves downward at ~40 mm/year relative to the overlying crust. As shown by Kufner et al. (2017, https://doi.org/10.1016/j.epsl.2016.12.043) and Zhan and Kanamori (2016, https://doi.org/10.1002/2016GL069603), the central part of the zone stretches so rapidly that this rate there is ~100 mm/year, much faster than the present‐day convergence rate of ~15 mm/year at the surface and across the Hindu Kush. The pattern of stretching, with maximum strain rates in the middle depths of the intermediate‐depth range, resembles that beneath the southeastern Carpathians, where Lorinczi and Houseman (2009, https://doi.org/10.1016/j.tecto.2008.05.024) have shown that seismicity is consistent with a blob of mantle lithosphere stretching rapidly and sinking into the asthenosphere, though more slowly than occurs beneath the Hindu Kush.
How Do Continents Deform During Mantle Exhumation? Insights From the Northern Iberia Inverted Paleopassive Margin, Western Pyrenees (France)
Authors: Asti Riccardo , Lagabrielle Yves , Fourcade Serge , Corre Benjamin , Monié Patrick 
Published: April 2019

AbstractExtreme crustal thinning associated with subcontinental mantle exhumation characterizes the distal domain of some current, magma‐poor continental passive margins. Since these domains lie at abyssal depths and are hardly accessible, their internal structure and the finite strain of the stretched crust are not directly observed and are only inferred. A detailed field study was conducted on exceptionally preserved Cretaceous distal margin analogs in two key areas of the western Pyrenees (North Pyrenean Zone): the Urdach and Saraillé ultramafic massifs in the Chaînons Béarnais range. A tight sampling allowed us to characterize the conditions of the ductile deformation of the continental crust exhumed together with the mantle. New 40Ar/39Ar dating on muscovite constrains the timing of the last deformation of the continental crust in relation with mantle exhumation to the late Albian. We propose a new reconstruction for the distal part of the North Iberian paleopassive margin based on the following constraints: (i) post‐Silurian Paleozoic rocks are never found in the distal domain; (ii) lower crustal levels are not found in the exhumed crustal units; (iii) extension in the pre‐Silurian series is accomplished by lenticular deformation and pervasive ductile flattening through anastomosing extensional mylonitic shear zones at temperatures of 350–450 °C; and (iv) at the final step of exhumation, only pre‐Silurian crustal lenses remained welded on the exhumed mantle. Finally, we discuss the importance of the crustal structure inherited from previous Paleozoic and Mesozoic tectonic events and we state that mantle exhumation was partially achieved before the Cretaceous North Pyrenean rifting.
X‐Ray Computed Microtomography Imaging of Abiotic Carbonate Precipitation in Porous Media From a Supersaturated Solution: Insights Into Effect of CO2 Mineral Trapping on Permeability
Authors: Baek Seung‐Hun , Hong Jung‐Wuk , Kim Kwang Yeom , Yeom Sun , Kwon Tae‐Hyuk 
Published: April 2019

AbstractAbiotic carbonate precipitation has garnered significant interest as a mechanism for mineral trapping of carbon dioxide (CO2) in geologic carbon storage, as a natural diagenetic process frequently occurring in marine environments, and as an engineering approach for soil improvement. This study explored pore‐scale precipitation of calcium carbonate (CaCO3) and its effect on the permeability of porous media, using X‐ray computed microtomography (CMT). In a column experiment, CaCO3 was precipitated in a sand pack from a supersaturated CaCO3 solution, while porosity, pore volume fraction of carbonate, and permeability were being monitored and X‐ray CMT images were being acquired. Permeability reduction by ~99.94% was observed when precipitated carbonate occupied ~46–47% of pore volume. The X‐ray CMT images showed that carbonate crystals were initially nucleated onto sand grain surfaces, which facilitated subsequent precipitation, indicating a predominantly grain‐coating behavior. The scanning electron microscopy revealed the carbonate crystals of ~1–20 μm in size and the presence of internal pores in the carbonate layers at the submicrometer scale. Variations in carbonate layer thickness and geometric tortuosity, and preferential carbonate precipitation behavior with local clogging were examined through morphological analysis and phase segmentation. Particularly, the pore‐scale precipitation pattern and hence the pore geometry were found to evolve with continued precipitation from a grain‐coating behavior, through a pore‐filling behavior, and finally into a dramatic pore‐throat‐clogging behavior. Our results provide unique experiment data for predictive modeling of long‐term CO2 transport and provide new insights into the changes in physical and transport properties during CO2 mineral trapping.
Mineral Precipitation in Fractures: Using the Level‐Set Method to Quantify the Role of Mineral Heterogeneity on Transport Properties
Authors: Jones Trevor A. , Detwiler Russell L. 
Published: April 2019

AbstractWe used a depth‐averaged reactive transport model to simulate transport of a supersaturated fluid through fractures and considered two models of precipitation‐induced surface alterations: (1) a localized 1‐D alteration of the surface and (2) a 3‐D alteration of the surface using the level‐set method. Comparing simulation results to a simple analytical solution for precipitation in a homogeneous (aperture and mineralogy) fracture demonstrated both models predict the alteration process reasonably well. However, comparing simulation results from both models to results from a recent experimental study of precipitation in a mineralogically heterogeneous fracture (Jones & Detwiler, 2016, https://doi.org/10.1002/2016GL069598) demonstrated that the ability of the 3‐D model to predict mineral growth across the aperture and in the fracture plane leads to much better agreement with the experimental observations. To quantify the role of reaction kinetics on the precipitation process, we ran additional simulations using the 3‐D evolution model for reaction rate constants ranging over 3 orders of magnitude. When the kinetics were much faster than the advective flux through the fracture, precipitation was focused near the inlet, which led to a transition from preferential flow near the inlet to more uniform flow near the outlet. When reaction kinetics were slow relative to advection, reaction sites grew uniformly throughout the fracture leading to the eventual formation of a single preferential flow path from inlet to outlet. Regardless of reaction rate, localization of precipitation reactions led to significant increases (3 to 20 times) in the time scale required to seal the fracture relative to a mineralogically homogeneous fracture.
A Curve‐Fitting Method for Estimating Bathymetry From Water Surface Height and Width
Authors: Schaperow Jacob R. , Li Dongyue , Margulis Steven A. , Lettenmaier Dennis P. 
Published: April 2019

AbstractRiver discharge estimation requires knowledge of bathymetry. However, aside from a few locations where surveys have been conducted, bathymetric data are unavailable, even for major rivers. It has been suggested that water surface elevation and flow width measurements from the upcoming Surface Water and Ocean Topography (SWOT) satellite mission (planned launch 2021) may be used to infer the submerged channel geometry; however, the full potential of these measurements for inferring bathymetry has yet to be explored. We apply four different techniques, with varying assumptions about height‐width relationships, to predict unknown bathymetry. We call these “curve‐fitting methods” the linear, slope break, nonlinear, and nonlinear slope break (NLSB) methods. The linear and slope break methods are based on a linear height‐width relationship, while the nonlinear and NLSB methods are based on a height‐width relationship derived from hydraulic geometry equations. We generate SWOT‐like observations of height and width based on 5‐m gridded Upper Mississippi River data and evaluate the performance of each curve‐fitting method given the SWOT‐like observations. The NLSB method predicts bed elevation and low flow area with the least error, although the nonlinear method may be preferred in low data conditions. Additionally, we show that our method outperforms previously suggested methods, and we propose an NLSB‐based bathymetry prior for Bayesian discharge estimation algorithms.
Cross-linking dots on metal oxides
Authors: Ramachandran Roshini , Jung Dahee , Spokoyny Alexander M. 
Published: April 2019

AbstractMetal oxides are ubiquitous in our daily lives because they are robust and possess versatile electrochemical properties. Despite their popularity, these materials present limitations with respect to effective large-scale implementation. Recently, there has been growing interest in creating hybrid metal oxides to tailor the morphology and properties of these materials. From this perspective, we highlight several recent developments in cross-linked hybrid metal oxides, focusing on chemical cross-linking techniques to enrich their properties. We discuss future directions of this cross-linking approach that could enable further manipulation of these materials.