bluuebunny/crossref_metadata_2025 huggingface dataset:
Mitigating high latitude ionospheric scintillation effects on GNSS Precise Point Positioning exploiting 1-s scintillation indices
Authors: Guo Kai , Vadakke Veettil Sreeja , Weaver Brian Jerald , Aquino Marcio
Published: February 2021

Ionospheric scintillation refers to rapid and random fluctuations in radio frequency signal intensity and phase, which occurs more frequently and severely at high latitudes under strong solar and geomagnetic activity. As one of the most challenging error sources affecting Global Navigation Satellite System (GNSS), scintillation can significantly degrade the performance of GNSS receivers, thereby leading to increased positioning errors. This study analyzes Global Positioning System (GPS) scintillation data recorded by two ionospheric scintillation monitoring receivers operational, respectively, in the Arctic and northern Canada during a geomagnetic storm in 2019. A novel approach is proposed to calculate 1-s scintillation indices. The 1-s receiver tracking error variances are then estimated, which are further used to mitigate the high latitude scintillation effects on GPS Precise Point Positioning. Results show that the 1-s scintillation indices can describe the signal fluctuations under scintillation more accurately. With the mitigation approach, the 3D positioning error is greatly reduced under scintillation analyzed in this study. Additionally, the 1-s tracking error variance achieves a better performance in scintillation mitigation compared with the previous approach which exploits 1-min tracking error variance estimated by the commonly used 1-min scintillation indices. This work is relevant for a better understanding of the high latitude scintillation effects on GNSS and is also beneficial for developing scintillation mitigation tools for GNSS positioning.
Kontaktverbrennungen durch einen Nachtspeicherofen – Unfall oder Misshandlung?
Authors: Kern N. , Potente S. , Verhoff M. A. , Kölzer S. C.
Published: February 2021

Ein 7 Monate alter weiblicher Säugling wurde mit Kontaktverbrennungen 2. Grades an beiden Beinen von seinen Eltern in der Notaufnahme eines Krankenhauses vorgestellt. Die Eltern berichteten, das Kind sei unbeaufsichtigt und nur mit einem Body bekleidet gegen den Nachtspeicherofen im Kinderzimmer gekrabbelt. Bei der 10 Tage später durchgeführten klinisch-rechtsmedizinischen Untersuchung zeigten sich streifige, teils parallel zueinander gestellte und gelenkübergreifende Verbrennungen an der rechten Oberschenkelaußen- und Unterschenkelrückaußenseite, an beiden Fußrücken und den Zehen sowie ein flächenhaftes Verbrennungsareal an der linken Unterschenkelaußenseite mit abgrenzbaren streifigen Anteilen.

Im Rahmen einer Ortsbegehung der elterlichen Wohnung mit Vermessung und Begutachtung der in der Wohnung befindlichen 3 Nachtspeicheröfen konnte zunächst festgestellt werden, dass sich die Verbrennungsmuster an den Beinen des Kindes mit dem Luftauslassgitter der beiden Nachtspeicheröfen im Wohn- und im Elternschlafzimmer (jeweils identisches Modell), hingegen nicht mit dem des Nachtspeicherofens im Kinderzimmer in Deckung bringen ließen. Für die Begutachtung konnte durch ergänzende Informationen eines technischen Sachverständigen zu den entsprechenden Nachtspeicheröfen und durch eine Literaturrecherche ein möglicher Geschehensablauf rekonstruiert werden.

Dieser Fall verdeutlicht zum einen, welche Gefahr für Säuglinge und Kleinkinder von Nachtspeicheröfen ausgehen kann, wenn diese nicht regelrecht gesichert und die Kinder unbeaufsichtigt sind. Zum anderen wird die Bedeutung einer detaillierten und – wenn nötig – interdisziplinären Rekonstruktion, inklusive einer Ortsbegehung, zur Abgrenzung eines möglichen Unfallhergangs von einer Kindesmisshandlung unterstrichen.
Impacts of replanting American ginseng on fungal assembly and abundance in response to disease outbreaks
Authors: Ji Li , Tian Lei , Nasir Fahad , Chang Jingjing , Chang Chunling , Zhang Jianfeng , Li Xiujun , Tian Chunjie
Published: February 2021

Soil physicochemical properties and fungal communities are pivotal factors for continuous cropping of American ginseng (Panax quinquefoliumL.). However, the response of soil physicochemical properties and fungal communities to replant disease of American ginseng has not yet been studied. High-throughput sequencing and soil physicochemical analyses were undertaken to investigate the difference of soil fungal communities and environmental driver factors in new and old ginseng fields; the extent of replant disease in old ginseng fields closely related to changes in soil properties and fungal communities was also determined. Results indicated that fungal communities in an old ginseng field were more sensitive to the soil environment than those in a new ginseng field, and fungal communities were mainly driven by soil organic matter (SOM), soil available phosphorus (AP), and available potassium (AK). Notably, healthy ginseng plants in new and old ginseng fields may influence fungal communities by actively recruiting potential disease suppressive fungal agents such asAmphinema,Cladophialophora,Cadophora,Mortierella,andWilcoxina. When these key groups and members were depleted, suppressive agents in the soil possibly declined, increasing the abundance of pathogens. Soil used to grow American ginseng in the old ginseng field contained a variety of fungal pathogens, includingAlternaria,Armillaria,Aphanoascus,Aspergillus,Setophoma,andRhexocercosporidium. Additionally, micro-ecological factors affecting disease outbreaks in the old ginseng field included a strengthening in competition relationships, a weakening in cooperation relationships, and a change of trophic strategies among fungal communities.
Access to Essential Surgical Care in Chiapas, Mexico: A System‐Wide Geospatial Analysis
Authors: Carrillo‐Villaseñor Fernando , Fowler Zachary , Moeller Ellie , Roa Lina , Macias Valeria , Koch Rachel , Mohar Sebastián , Caddell Luke , Cervantes Sabrina , Mathews Ian , Riviello Robert , Cervantes‐Trejo Arturo , Meara John G. , Uribe‐Leitz Tarsicio
Published: February 2021

Background

Long travel times to reach essential surgical care in Chiapas, Mexico's poorest state, can delay lifesaving procedures and contribute to adverse outcomes. Geographical access to surgical facilities is 1 of the 6 indicators of the Lancet Commission on Global Surgery and has been measured extensively worldwide. Our objective is to determine the population with 2‐h geographical access to facilities capable of performing the Bellwether procedures (laparotomy, cesarean delivery, and open fracture repair). This is the first study in Mexico to assess access to surgical facilities, including both the fragmented public sector and the private sector.

Methods

In this cross‐sectional study, conducted from June 2019 to January 2020, Bellwether capable surgical facilities from all health systems in Chiapas were geocoded and assessed through on‐site data collection, Ministry of Health databases, and verified via telephone. Geospatial analyses were performed on Redivis.

Results

We identified 59 Bellwether capable hospitals, with 17.5% (n = 954,460) of the state residing more than 2 h from surgical care in public and private health systems. Of those, 22 facilities had confirmed 24/7 Bellwether capability, and 23% (n = 1,178,383) of the affiliated population resided more than 2 h from these hospitals.

Conclusions

Our study shows that the Ministry of Health and employment‐based health coverage could provide timely access to essential surgical care for the majority of the population. However, the fragmentation of the healthcare system leaves a gap that contributes to delays in care and unmet emergency surgical needs.
Yearly evolution of Euro-Atlantic weather regimes and of their sub-seasonal predictability
Authors: Cortesi Nicola , Torralba Verónica , Lledó Llorenç , Manrique-Suñén Andrea , Gonzalez-Reviriego Nube , Soret Albert , Doblas-Reyes Francisco J.
Published: February 2021

It is often assumed that weather regimes adequately characterize atmospheric circulation variability. However, regime classifications spanning many months and with a low number of regimes may not satisfy this assumption. The first aim of this study is to test such hypothesis for the Euro-Atlantic region. The second one is to extend the assessment of sub-seasonal forecast skill in predicting the frequencies of occurrence of the regimes beyond the winter season. Two regime classifications of four regimes each were obtained from sea level pressure anomalies clustered from October to March and from April to September respectively. Their spatial patterns were compared with those representing the annual cycle. Results highlight that the two regime classifications are able to reproduce most part of the patterns of the annual cycle, except during the transition weeks between the two periods, when patterns of the annual cycle resembling Atlantic Low regime are not also observed in any of the two classifications. Forecast skill of Atlantic Low was found to be similar to that of NAO+, the regime replacing Atlantic Low in the two classifications. Thus, although clustering yearly circulation data in two periods of 6 months each introduces a few deviations from the annual cycle of the regime patterns, it does not negatively affect sub-seasonal forecast skill. Beyond the winter season and the first ten forecast days, sub-seasonal forecasts of ECMWF are still able to achieve weekly frequency correlations of r = 0.5 for some regimes and start dates, including summer ones. ECMWF forecasts beat climatological forecasts in case of long-lasting regime events, and when measured by the fair continuous ranked probability skill score, but not when measured by the Brier skill score. Thus, more efforts have to be done yet in order to achieve minimum skill necessary to develop forecast products based on weather regimes outside winter season.
Spinal cord injury as an indicator of abuse in forensic assessment of abusive head trauma (AHT)
Authors: Colombari Michela , Troakes Claire , Turrina Stefania , Tagliaro Franco , De Leo Domenico , Al-Sarraj Safa
Published: February 2021

Abusive head trauma (AHT) in children is notoriously one of the most challenging diagnoses for the forensic pathologist. The pathological “triad”, a combination of intracranial subdural haematoma, cerebral oedema with hypoxic-ischaemic changes and retinal haemorrhages, is frequently argued to be insufficient to support a corroborated verdict of abuse. Data from all available English-language scientific literature involving radiological and neuropathological spinal cord examination is reviewed here in order to assess the contribution of spinal cord changes in differentiating abusive from accidental head trauma. In agreement with the statistically proven association between spinal subdural haemorrhage (SDH) and abuse (Choudhary et al. in Radiology 262:216–223, 2012), spinal blood collection proved to be the most indicative finding related to abusive aetiology. The incidence of spinal blood collection is as much as 44–48% when all the spinal cord levels are analysed as opposed to just 0–18% when the assessment is performed at cervical level only, in agreement with the evidence of the most frequent spinal SDH location at thoracolumbar rather than cervical level. In this review, the source of spinal cord blood collection and how the age of the child relates to the position of spinal cord lesions is also discussed. We concluded that the ante mortem MRI examination and post mortem examination of whole-length spinal cord is of fundamental interest for the assessment of abuse in the forensic setting.
Gas exchange, vine performance and modulation of secondary metabolism in Vitis vinifera L. cv Barbera following long-term nitrogen deficit
Authors: Squeri Cecilia , Miras-Moreno Begoña , Gatti Matteo , Garavani Alessandra , Poni Stefano , Lucini Luigi , Trevisan Marco
Published: February 2021

Main Conclusion

A reprogramming of secondary metabolism to acclimate to nitrogen deficiency was seen in grapevine eliciting an accumulation of strigolactones and jasmonate. This response links with photosynthetic compensation and enhanced ripening.

In addition to the metabolism directly related to nitrogen assimilation, long-term nitrogen depletion may affect plant secondary metabolism, in turn affecting grapevine performance. In this work, the effect of nitrogen deficit was investigated inV. viniferacv. Barbera potted vines following three years of deprivation, using a combination of morpho-physiological assessments and mass spectrometry-based untargeted metabolomics. Plants grown under nitrogen limitation showed reduced growth and even more curtailed yields, lowered SPAD values, and a quite preserved leaf gas exchange, compared to plants grown under non-limiting nitrogen availability. Ripening was decidedly accelerated, and berry composition improved in terms of higher sugar and phenolic contents under nitrogen-limiting conditions. Metabolomics showed the broad involvement of secondary metabolism in acclimation to nitrogen deficiency, including a distinctive modulation of the phytohormone profile. Several nitrogen-containing metabolites were down accumulated under nitrogen-limiting conditions, including alkaloids, glucosinolates, hypoxanthine, and inosine. On the other hand, phenylpropanoids showed an accumulation trend. Concerning the recruitment of hormones, nitrogen deprivation elicited an accumulation of strigolactones and jasmonate. Noteworthy, both strigolactones and jasmonates have been previously related to increased photosynthetic efficiency under abiotic stress. Furthermore, the severe reduction of lateral shoot development we recorded in N-deprived vines is consistent with the accumulation of strigolactones. Overall, our results suggest that nitrogen deprivation induced a rather broad metabolic reprogramming, mainly including secondary metabolism and hormones profile, reflected in the modulation of photosynthetic performance, canopy growth, and possibly fruit quality.
60-year record of stem xylem anatomy and related hydraulic modification under increased summer drought in ring- and diffuse-porous temperate broad-leaved tree species
Authors: Zimmermann Jorma , Link Roman M. , Hauck Markus , Leuschner Christoph , Schuldt Bernhard
Published: February 2021

Key message

By combining dendrochronological time-series analysis with radial vessel features, we show that the reconstruction of hydraulic properties improves our understanding of tree species’ acclimation potential to climate change.

The vascular architecture plays a crucial role in the productivity and drought tolerance of broadleaf trees, but it is not yet fully understood how the hydraulic system is acclimating to a warmer and drier climate. Because vessel features may record temporal and spatial variability in climatic signals of the past better than tree-ring width, we combined dendrochronological time-series analysis with the calculation of stem hydraulic properties derived from radial vessel features. We aimed to reconstruct the development and sensitivity of the hydraulic system over six decades and to identify climatic control of xylem anatomy for five co-existing broad-leaved diffuse- and ring-porous tree species (generaAcer,Fagus,FraxinusandQuercus) across three sites covering a precipitation gradient from 548 to 793 mm. We observed a significant influence of the climatic water balance (CWB) on the vessel features of all species, but the time lag, magnitude and direction of the response was highly species-specific. All diffuse-porous species suffered a decline in vessel diameter in dry years, and increase in vessel density in dry years and the year following. However,F. sylvaticawas the only species with a significant long-term change in anatomical traits and a significant reduction in potential hydraulic conductivity (Kp) after dry winters and in dry summers, accompanied with the largest long-term decline in tree-ring width and the largest growth reduction in and after years with a more negative CWB. In contrast, the comparison across the precipitation gradient did not reveal any significant vessel-climate relationships. Our results revealed considerable plasticity in the hydraulic system especially ofF. sylvatica, but also evidence of the drought-sensitivity of this species in accordance with earlier dendroecological and physiological studies. We conclude that the long-term reconstruction of hydraulic properties can add substantially to the understanding of the acclimation potential of different tree species to climate change.
Accreditation in Europe: benchmarking the operations of European accreditation bodies using an innovative management tool
Authors: Denkler Tilman
Published: February 2021

Accreditation is one of the pillars of a national Quality Infrastructure, as the competence of conformity assessment bodies is assured through accreditation performed by accreditation bodies. To compare the operation of accreditation bodies in Europe and to identify best practices, a management tool, the Process Maturity Benchmarking Tool, was developed and validated by applying it to European accreditation bodies. The benchmarking project comprised two major phases: in the first phase, the processes of accreditation bodies were systematically analyzed. A process map was developed, and processes of special relevance were identified and underpinned by indicators. In the second phase, the practical applicability of the theoretical model was demonstrated by analyzing the processes of eight European accreditation bodies. The results of this comparative assessment were subsequently discussed in a workshop with experts from those accreditation bodies, giving the opportunity to identify best practices. This article has a twofold objective. First, to present a method to benchmark European accreditation bodies, based on the European Foundation for Quality Management excellence model. The successful application of the Process Maturity Benchmarking Tool gives evidence that it is a suitable and capable management tool to assess the processes of the European accreditation bodies and to benchmark them. Second, the article presents the results of the first adaption of the Process Maturity Benchmarking Tool. A general trend of process maturity was identified: while processes based on stakeholder involvement tend to have an overall lower maturity on average, internal processes are more mature.
Interactions among Norway spruce, the bark beetle Ips typographus and its fungal symbionts in times of drought
Authors: Netherer Sigrid , Kandasamy Dineshkumar , Jirosová Anna , Kalinová Blanka , Schebeck Martin , Schlyter Fredrik
Published: February 2021

Resilience and functionality of European Norway spruce forests are increasingly threatened by mass outbreaks of the bark beetle Ips typographus promoted by heat, wind throw and drought. Here, we review current knowledge on Norway spruce and I. typographus interactions from the perspective of drought-stressed trees, host selection, colonisation behaviour of beetles, with multi-level effects of symbiotic ophiostomatoid fungi. By including chemo-ecological, molecular and behavioural perspectives, we provide a comprehensive picture on this complex, multitrophic system in the light of climate change. Trees invest carbon into specialised metabolism to produce defence compounds against biotic invaders; processes that are strongly affected by physiological stress such as drought. Spruce bark contains numerous terpenoid and phenolic substances, which are important for bark beetle aggregation and attack success. Abiotic stressors such as increased temperatures and drought affect composition, amounts and emission rates of volatile compounds. Thus, drought events may influence olfactory responses of I. typographus, and further the pheromone communication enabling mass attack. In addition, I. typographus is associated with numerous ophiostomatoid fungal symbionts with multiple effects on beetle life history. Symbiotic fungi degrade spruce toxins, help to exhaust tree defences, produce beetle semiochemicals, and possibly provide nutrition. As the various fungal associates have different temperature optima, they can influence the performance of I. typographus differently under changing environmental conditions. Finally, we discuss why effects of drought on tree-killing by bark beetles are still poorly understood and provide an outlook on future research on this eruptive species using both, field and laboratory experiments.
Endowing Robots with Longer-term Autonomy by Recovering from External Disturbances in Manipulation Through Grounded Anomaly Classification and Recovery Policies
Authors: Luo Shuangqi , Wu Hongmin , Duan Shuangda , Lin Yijiong , Rojas Juan
Published: February 2021

Robots are poised to interact with humans in unstructured environments. Despite increasingly robust control algorithms, failure modes arise whenever the underlying dynamics are poorly modeled, especially in unstructured environments. We contribute a set of recovery policies to deal with anomalies produced by external disturbances. The recoveries work when various different types of anomalies are triggered any number of times at any point in the task, including during already running recoveries. Our recovery critic stands atop of a tightly-integrated, graph-based online motion-generation and introspection system. Policies, skills, and introspection models are learned incrementally and contextually over time. Recoveries are studied via a collaborative kitting task where a wide range of anomalous conditions are experienced in the system. We also contribute an extensive analysis of the performance of the tightly integrated anomaly identification, classification, and recovery system under extreme anomalous conditions. We show how the integration of such a system achieves performances greater than the sum of its parts.
Cardiovascular risk and testosterone – from subclinical atherosclerosis to lipoprotein function to heart failure
Authors: Gencer Baris , Bonomi Marco , Adorni Maria Pia , Sirtori Cesare R. , Mach François , Ruscica Massimiliano
Published: February 2021

The cardiovascular (CV) benefit and safety of treating low testosterone conditions is a matter of debate. Although testosterone deficiency has been linked to a rise in major adverse CV events, most of the studies on testosterone replacement therapy were not designed to assess CV risk and thus excluded men with advanced heart failure or recent history of myocardial infarction or stroke. Besides considering observational, interventional and prospective studies, this review article evaluates the impact of testosterone on atherosclerosis process, including lipoprotein functionality, progression of carotid intima media thickness, inflammation, coagulation and thromboembolism, quantification of plaque volume and vascular calcification. Until adequately powered studies evaluating testosterone effects in hypogonadal men at increased CV risk are available (TRAVERSE trial), clinicians should ponder the use of testosterone in men with atherosclerotic cardiovascular disease and discuss benefit and harms with the patients.
Sapling and coppice biomass heritabilities and potential gains from Eucalyptus polybractea progeny trials
Authors: Spencer Beren , Mazanec Richard , Gibberd Mark , Zerihun Ayalsew
Published: February 2021

Eucalyptus polybractea has been planted as a short-rotation coppice crop for bioenergy in Western Australia. Historical breeding selections were based on sapling biomass and despite a long history as a coppice crop, the genetic parameters of coppicing are unknown. Here, we assessed sapling biomass at ages 3 and 6 from three progeny trials across southern Australia. After the second sapling assessment, all trees were harvested. Coppice biomass was assessed 3.5 years later. Mortality following harvest was between 1 and 2%. Additive genetic variance for the 6-sapling estimate at one site was not significant. Sapling heritabilities were between 0.06 and 0.36 at 3 years, and 0.18 and 0.20 at 6 years. The heritability for the coppice biomass was between 0.07 and 0.17. Within-site genetic and phenotypic correlations were strong between all biomass assessments. Cross-site correlations were not different from unity. Selections based on net breeding values revealed positive gains in sapling and coppice biomass. Lower or negative gains were estimated if 3-year sapling selections were applied to the coppice assessments (−7.1% to 3.4%) with useful families culled. Positive gains were obtained if 6-year sapling selections were applied to the coppice assessment (6.4% to 9.3%) but these were lower than those obtained by applying coppice selections to the coppice assessment (8.4% to 14.8%). Removal of poor performing families and families that displayed fast sapling growth rates but under-performed as coppice will benefit potential coppice production. These results indicate that selections should be made using coppice data.
Aktinische Keratosen
Authors: Borik-Heil L. , Geusau A.
Published: February 2021

Aktinische Keratosen (AKs) sind definiert als intraepidermale Proliferation atypischer Keratinozyten auf UV-geschädigter Haut mit dem Potenzial, in ein invasives kutanes Plattenepithelkarzinom (PEK) fortzuschreiten. AKs zählen zu den häufigsten Dermatosen im dermatologischen Alltag mit hoher Morbidität insbesondere bei älteren oder immunsupprimierten Patienten. Eine frühe und konsequente Therapie von AKs spielt eine Schlüsselrolle in der Prävention invasiver PEKs der Haut. Ziel dieses Artikels ist es, den aktuellen Wissensstand bezüglich der Pathogenese, der Klassifikationen und verfügbarer Therapieoptionen darzustellen, um zu einer optimalen Betreuung dieser Patienten beizutragen.
Local singular characteristics on $$\mathbb {R}^2$$
Authors: Cannarsa Piermarco , Cheng Wei
Published: February 2021

The singular set of a viscosity solution to a Hamilton–Jacobi equation is known to propagate, from any noncritical singular point, along singular characteristics which are curves satisfying certain differential inclusions. In the literature, different notions of singular characteristics were introduced. However, a general uniqueness criterion for singular characteristics, not restricted to mechanical systems or problems in one space dimension, is missing at the moment. In this paper, we prove that, for a Tonelli Hamiltonian on $$\mathbb {R}^2$$

R

2

, two different notions of singular characteristics coincide up to a bi-Lipschitz reparameterization. As a significant consequence, we obtain a uniqueness result for the class of singular characteristics that was introduced by Khanin and Sobolevski in the paper [On dynamics of Lagrangian trajectories for Hamilton-Jacobi equations. Arch. Ration. Mech. Anal., 219(2):861–885, 2016].
Duality of capacities and Sobolev extendability in the plane
Authors: Zhang Yi Ru-Ya
Published: February 2021

We reveal relations between the duality of capacities and the duality between Sobolev extendability of Jordan domains in the plane, and explain how to read the curve conditions involved in the Sobolev extendability of Jordan domains via the duality of capacities. Finally as an application, we give an alternative proof of the necessary condition for a Jordan planar domain to be $$W^{1,\,q}$$

W

1
,

q

-extension domain when $$2<q<\infty$$

2
<
q
<
∞

.
Multi-constrained cooperative path planning of multiple drones for persistent surveillance in urban environments
Authors: Wu Yu , Wu Shaobo , Hu Xinting
Published: February 2021

Different from the usual surveillance task in which the goal is to achieve complete coverage of the specified area, the cooperative path planning problem of drones for persistent surveillance task is studied in this paper considering multiple constraints of the covered area. The goal is to maximize the combinational coverage area of drones while giving preference to the area that hasn’t been visited beyond a certain time interval. The influence of shooting resolution and blocking of buildings are considered, and the state information of each grid is defined to record the visit information of the ground area. Considering the characteristic of the established model, the multi-constrained cooperative path planning (MCCPP) algorithm is developed. The grids which have not been visited for a long time are received special attentions, and the drone is led to reducing the flight height to cover the gird which has a special requirement on the shooting resolution. The cooperation mechanism among drones is also set to ensure that all the drones can determine the next path point synchronously. An emergency path planning algorithm with the continuous checking strategy is designed for a drone to fly to the specified area and finish a complete coverage of it.
Can the Plight of the European Banking Structural Reforms be a Blessing in Disguise?
Authors: Nabilou Hossein
Published: February 2021

One of the problems perceived to be at the heart of the global financial crisis was an amalgamation of various commercial and investment banking activities under one entity, as well as the interconnectedness of the banking entities with other financial institutions, investment funds, and the shadow banking system. This paper focuses on various measures that aim to structurally separate the banking entities and their core functions from riskier financial activities such as (proprietary) trading or investments in alternative investment funds. Although banking structural reforms in the EU, the UK, and the US have taken different forms, their common denominator is the separation of core banking functions from certain trading or securities market activities. Having reviewed the arguments for and against banking structural reforms and their varieties in major jurisdictions, including the EU, UK, US, France, and Germany, the paper argues that a more nuanced approach to introducing such measures at the EU level is warranted. Given the different market structures across the Atlantic and the lack of conclusive evidence of the beneficial impact of banking structural reforms, the paper concludes that the withdrawal of the banking structural reforms proposal by the European Commission has been a prudent move. It seems that in the absence of concrete evidence, experimenting with structural reforms at the Member-State level would be less costly and would provide for opportunities for learning from smaller experiments that could pave the way for a more optimal approach to banking structural reforms at the European level in the future.
Robust nonsingular sliding mode control of the maglev train system: case study
Authors: Alain Kammogne Soup Tewa , Fabien Kenmogne , Martin Siewe Siewe , Bertrand Fotsin Hilaire
Published: February 2021

This paper deals with a new approach to explore the precise dynamic response of the maglev system train and its control. Magnetic-suspension systems are characterized by high nonlinearity and open-loop instability which are the core components of maglev vehicles. Firstly, we use the electromagnetics and mechanics laws to derive the mathematical expressions of the proposed maglev system. Analytical investigation and theoretical calculation show that for the specific values of the control system parameters, the maglev system train can be significantly improved. It points out that the inherent nonlinearity, the inner coupling, misalignments between the sensors and actuators, and external disturbances are the main issues that should be considered for maglev engineering. Secondly, a control strategy based on the precise model of a nonsing ular robust sliding mode control is designed to reduce the upper bound of both the uncertainty and interference of the sliding mode controller. This approach presents an added value compared to the new sliding control methods in terms of overshoot and speed of convergence which is designed to control the vertical position of the proposed system. By using rigorous mathematical transformation associated with the adaptation laws in the frequency domain, a sufficient condition is drawn for the stability of the dynamical error based on the Lyapunov theory. This allows us a great possibility for interpreting the operation of the maglev train system. Numerical results are presented to show the effectiveness of our proposed control scheme.
Variational quantum Boltzmann machines
Authors: Zoufal Christa , Lucchi Aurélien , Woerner Stefan
Published: February 2021

This work presents a novel realization approach to quantum Boltzmann machines (QBMs). The preparation of the required Gibbs states, as well as the evaluation of the loss function’s analytic gradient, is based on variational quantum imaginary time evolution, a technique that is typically used for ground-state computation. In contrast to existing methods, this implementation facilitates near-term compatible QBM training with gradients of the actual loss function for arbitrary parameterized Hamiltonians which do not necessarily have to be fully visible but may also include hidden units. The variational Gibbs state approximation is demonstrated with numerical simulations and experiments run on real quantum hardware provided by IBM Quantum. Furthermore, we illustrate the application of this variational QBM approach to generative and discriminative learning tasks using numerical simulation.
Remediation of mercury-contaminated soils and sediments using biochar: a critical review
Authors: Yang Qian , Wang Yongjie , Zhong Huan
Published: February 2021

The transformation of mercury (Hg) into the more toxic and bioaccumulative form methylmercury (MeHg) in soils and sediments can lead to the biomagnification of MeHg through the food chain, which poses ecological and health risks. In the last decade, biochar application, an in situ remediation technique, has been shown to be effective in mitigating the risks from Hg in soils and sediments. However, uncertainties associated with biochar use and its underlying mechanisms remain. Here, we summarize recent studies on the effects and advantages of biochar amendment related to Hg biogeochemistry and its bioavailability in soils and sediments and systematically analyze the progress made in understanding the underlying mechanisms responsible for reductions in Hg bioaccumulation. The existing literature indicates (1) that biochar application decreases the mobility of inorganic Hg in soils and sediments and (2) that biochar can reduce the bioavailability of MeHg and its accumulation in crops but has a complex effect on net MeHg production. In this review, two main mechanisms, a direct mechanism (e.g., Hg-biochar binding) and an indirect mechanism (e.g., biochar-impacted sulfur cycling and thus Hg-soil binding), that explain the reduction in Hg bioavailability by biochar amendment based on the interactions among biochar, soil and Hg under redox conditions are highlighted. Furthermore, the existing problems with the use of biochar to treat Hg-contaminated soils and sediments, such as the appropriate dose and the long-term effectiveness of biochar, are discussed. Further research involving laboratory tests and field applications is necessary to obtain a mechanistic understanding of the role of biochar in reducing Hg bioavailability in diverse soil types under varying redox conditions and to develop completely green and sustainable biochar-based functional materials for mitigating Hg-related health risks.
The meaning of absence: the primate tree that did not make it into Darwin'sThe Descent of Man
Authors: Sommer Marianne
Published: February 2021

This paper engages with a specific image: Darwin's tree of the primates. Although this diagram was sketched in ink on paper in 1868, it did not make it into the publication ofThe Descent of Man(1871). This may seem all the more in need of an explanation because, as Adrian Desmond and James Moore have shown, Darwin strongly relied on the notion of familial genealogy in the development of his theory of organismic evolution, or rather descent. However, Darwin expressed scepticism towards visualizations of phylogenies in correspondence with Ernst Haeckel and in fact also inDescent, considering such representations at once too speculative and too concrete. An abstraction such as a tree diagram left little room to ponder possibilities or demarcate hypotheses from evidence. I thus bring Darwin's primate tree into communication with his view on primate and human phylogeny as formulated inDescent, including his rejection of polygenism. I argue that considering the tree's inherent teleology, as well as its power to suggest species status of human populations and to reify ‘racial’ hierarchies, the absence of the diagram inThe Descent of Manmay be a significant statement.
Legal Doctrine and Judicial Review of Eminent Domain in China
Authors: Mao Wenzheng , Qiao Shitong
Published: February 2021

Which of the three legal doctrines of public use, just compensation, and due process is the most effective in constraining abuses of eminent domain power? This article addresses this question for the first time and presents the first-ever systematic investigation of the judicial review of eminent domain in China. Our empirical study reveals that Chinese courts focus on eminent domain procedures while rarely supporting claims based on public interest or just compensation. Procedural rules are determinate and therefore easier to enforce than substantial standards of public interest and just compensation. Chinese courts also choose to focus on eminent domain procedures to confine their own judicial review power for the purpose of self-preservation in an authoritarian state that empowers the courts to monitor and control local governments but does not want them to become too powerful. The study calls for a “due process revolution” in eminent domain law and introduces the “judicial politics of legal doctrine” approach to the study of Chinese law, an approach that takes both political institutions and legal doctrines seriously.
The probable and the nonarbitrary: evidential foundations for a finding of guilt
Authors: Levanon Liat
Published: February 2021

The paper explores the use of statistical data and statistical assumptions as evidence in criminal trials. It is suggested that a finding of guilt includes not only its main factual proposition but also additional propositions that support and affirm it. Specifically, it includes not only the proposition that the defendant committed the offence but also the additional affirming proposition that it is this defendant rather than any other potential defendant who committed the offence (the ‘D rather than A’ proposition). Some statistical generalisations provide reasons in defence of the main proposition but not in defence of the affirming proposition, which then remains random or arbitrary. Yet since criminal convictions include a moral judgement, they cannot be justified where some of their propositions are arbitrary. Accordingly, such statistical generalisations cannot justify a criminal conviction.
Deliberation, Single-Peakedness, and Coherent Aggregation
Authors: RAD SOROUSH RAFIEE , ROY OLIVIER
Published: February 2021

Rational deliberation helps to avoid cyclic or intransitive group preferences by fostering meta-agreements, which in turn ensures single-peaked profiles. This is the received view, but this paper argues that it should be qualified. On one hand we provide evidence from computational simulations that rational deliberation tends to increase proximity to so-called single-plateaued preferences. This evidence is important to the extent that, as we argue, the idea that rational deliberation fosters the creation of meta-agreement and, in turn, single-peaked profiles does not carry over to single-plateaued ones, and the latter but not the former makes coherent aggregation possible when the participants are allowed to express indifference between options. On the other hand, however, our computational results show, against the received view, that when the participants are strongly biased towards their own opinions, rational deliberation tends to create irrational group preferences, instead of eliminating them. These results are independent of whether the participants reach meta-agreements in the process, and as such they highlight the importance of rational preference change and biases towards one’s own opinion in understanding the effects of rational deliberation.
Altered neural activities during response inhibition in adults with addiction: a voxel-wise meta-analysis
Authors: Qiu Zeguo , Wang Junjing
Published: February 2021

Background

Previous literature has extensively investigated the brain activity during response inhibition in adults with addiction. Inconsistent results including both hyper- and hypo-activities in the fronto-parietal network (FPN) and the ventral attention network (VAN) have been found in adults with addictions, compared with healthy controls (HCs).

Methods

Voxel-wise meta-analyses of abnormal task-evoked regional activity were conducted for adults with substance dependence (SD) and behavioral addiction during response inhibition tasks to solve previous inconsistencies. Twenty-three functional magnetic resonance imaging studies including 479 substance users, 38 individuals with behavioral addiction and 494 HCs were identified.

Results

Compared with HCs, all addictions showed hypo-activities in regions within FPN (inferior frontal gyrus and supramarginal gyrus) and VAN (inferior frontal gyrus, middle temporal gyrus, temporal pole and insula), and hyper-activities in the cerebellum during response inhibition. SD subgroup showed almost the same activity patterns, with an additional hypoactivation of the precentral gyrus, compared with HCs. Stronger activation of the cerebellum was associated with longer addiction duration for adults with SD. We could not conduct meta-analytic investigations into the behavioral addiction subgroup due to the small number of datasets.

Conclusion

This meta-analysis revealed altered activation of FPN, VAN and the cerebellum in adults with addiction during response inhibition tasks using non-addiction-related stimuli. Although FPN and VAN showed lower activity, the cerebellum exhibited stronger activity. These results may help to understand the neural pathology of response inhibition in addiction.
SULLA NASCITA DELL'ARCHEOLOGIA CRISTIANA: IL CANTIERE DELLA BASILICA VATICANA NOVA
Authors: Cecalupo Chiara
Published: February 2021

Il presente testo nasce da alcune considerazioni compiute nel corso della totale revisione dell'opera edita e manoscritta di Antonio Bosio e si focalizza, in senso più ampio, sul fenomeno della nascita dell'archeologia cristiana nel corso del XVI secolo. Partendo da alcuni spunti storici offerti appunto dall'opera di Bosio, vengono presentate alcune vicende relative al cantiere della basilica di San Pietro durante la seconda metà del Cinquecento, testimoniate soprattutto da Tiberio Alfarano. L'obiettivo è quello di riconsiderare il ruolo degli scavi e dei lavori architettonici della Basilica Vaticana nella nascita dell'archeologia cristiana, qualche anno prima dell'accidentale scoperta della catacomba anonima di via Anapo, evento ad oggi considerato l'inizio della disciplina.
Size matters: locality of residence and media use in later life
Authors: Rosenberg Dennis , Nimrod Galit
Published: February 2021

Various factors determine the use of media in later life. Nevertheless, spatial inequalities among older media users have been accorded little attention in academic research. This study aimed to explore differences in variety (number) and intensity (duration) of both traditional and new media use among older adults residing in various types of localities. Data were obtained from the second wave of the ACT (Ageing + Communication + Technology) cross-national survey, comprising 7,927 internet users aged 60 and over from seven countries. The statistical analyses used in the study were chi-square and analysis of variance tests, and linear regression as a multivariate technique. The results indicated that spatial differences concern variety of media use to a greater extent than its intensity, especially with regard to use of traditional media via new devices. Overall, residents of large cities exhibited greater variety and intensity of media use than did their counterparts from smaller localities, especially rural ones. These findings supported the social stratification hypothesis – according to which individuals from more-privileged social backgrounds have better media literacy, use media to a greater extent and benefit from its use more than people from disadvantaged groups. The findings should be considered by practitioners and policy makers.
Energy-Efficient Bipedal Walking: From Single-Mass Model to Three-Mass Model
Authors: Ding Jiatao , Zhou Jiangchen , Guo Zhao , Xiao Xiaohui
Published: February 2021

The work aims to realize energy-efficient bipedal walking by employing the three-mass inverted pendulum model (3MIPM) and compare its energy performance with linear inverted pendulum model (LIPM). To do this, a general optimal index on center of mass (CoM) acceleration is first derived for energetic cost evaluation. After defining the equivalent zero moment point (ZMP) motion, an unconstrained optimization approach for CoM generation is extended for 3MIPM, which can track different ZMP references and address the height variation as well. To make use of the allowable ZMP movement, a constrained optimization method is also employed, contributing to lower energetic cost. Simulation and hardware experiments on a humanoid robot demonstrate that the 3MIPM could achieve higher energy efficiency.
Sex Work and Stigma Management in China and Hong Kong: The Role of State Policy and NGO Advocacy
Authors: Choi Susanne Y.P. , Lai Ruby Y.S.
Published: February 2021

This paper examines the impacts of state policies and NGO advocacy on female sex workers’ identity and how they manage stigma. Comparing three groups of sex workers – those born and working in mainland China, those born and working in Hong Kong, and those born in mainland China who later migrated to Hong Kong and entered the sex industry – this paper suggests that differences in state policies on prostitution and the different degrees of visibility of NGOs campaigning for sex workers’ rights are related to three strategies used by sex workers to construct a positive self-image to counteract the stigma they face: gendered obligation fulfilment, professional work and responsible citizenship. The paper illustrates that stigmatized-identity management involves complex relationships among individual interpretation, selection and mobilization of gender, work and citizenship scripts, which are contingent on structural features of the environment and may change during migration and relocation.
Economic Statecraft: Is There a Sub-National Dimension? Evidence from United States–China Rivalry
Authors: Evenett Simon J.
Published: February 2021

Using detailed information on policy interventions by US sub-national governments between 2009 and 2019, the contribution of such public bodies to Sino-US geopolitical rivalry is examined, in particular since President Trump took office in 2017. While US sub-national governments accounted for 28% of all US policy interventions that harmed Chinese commercial interests, awarding firm-specific subsidies in 88% of cases, the timing and sectoral incidence of such intervention suggests that economic statecraft considerations could only be part of the explanation for their actions. Ironically, the interventions of US sub-national governments and their weak commitment to transparency have much in common with their frequently maligned Chinese counterparts.
FREGE’S THEORY OF REAL NUMBERS: A CONSISTENT RENDERING
Authors: BOCCUNI FRANCESCA , PANZA MARCO
Published: February 2021

Frege’s definition of the real numbers, as envisaged in the second volume of Grundgesetze der Arithmetik, is fatally flawed by the inconsistency of Frege’s ill-fated Basic Law V. We restate Frege’s definition in a consistent logical framework and investigate whether it can provide a logical foundation of real analysis. Our conclusion will deem it doubtful that such a foundation along the lines of Frege’s own indications is possible at all.