bluuebunny/crossref_metadata_2025 huggingface dataset:
Correction to: Effect of soil preparation method on root development of P. sylvestris and P. abies saplings in commercial forest stands
Authors: Celma Santa , Blate Katrīna , Lazdiņa Dagnija , Dūmiņš Kārlis , Neimane Santa , Štāls Toms A. , Štikāne Kristīne
Published: March 2020

The article [Effect of soil preparation method on root development of P. sylvestris and P. abies saplings in commercial forest stands], written by [Santa Celma, Katrīna Blate, Dagnija Lazdiņa, Kārlis Dūmiņš, Santa Neimane, Toms A. Štāls, Kristīne Štikāne], was originally published Online First without Open Access. After publication in volume [#], issue [#], page [#-#], the author decided to opt for Open Choice and to make the article an Open Access publication. Therefore, the copyright of the article has been changed to © The Author(s) [2020] and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, duplication, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Turbulent travel speeds in nonlinear vehicle dynamics
Authors: Wedig Walter V.
Published: March 2020

Quarter car models of vehicles rolling on wavy roads lead to limit cycles of travel speed and acceleration with period doublings and bifurcation effects for appropriate driving force parameters. In case of narrow-banded road excitations, speed jumps occur, additionally. This has the consequence that the driving speed becomes turbulent. Bifurcation and jump effects vanish with growing vehicle damping. The same happens for increasing bandwidth of road excitations when, e.g., on flat highways there are no big road waves but only small noisy slope processes generated by rough road surfaces. The paper derives a new stability condition in mean. Numerical time integrations are stabilized by means of polar coordinates. Equivalently, Fourier series expansions are introduced in the angle domain. Phase portraits of travel speed and acceleration show new period-doublings of limit cycles when speed gets stuck before resonance. The paper extends these investigations to the stochastic case that road surfaces are random generated by filtered white noise. By means of Gaussian closure, a nonlinear mean speed equation is derived which includes the extreme cases of wavy roads and road noise.
Predicting the effects of anthropogenic noise on fish reproduction
Authors: de Jong Karen , Forland Tonje Nesse , Amorim Maria Clara P. , Rieucau Guillaume , Slabbekoorn Hans , Sivle Lise Doksæter
Published: March 2020

Aquatic animals use and produce sound for critical life functions, including reproduction. Anthropogenic noise is recognized as a global source of environmental pollution and adequate conservation and management strategies are urgently needed. It becomes therefore critical to identify the reproductive traits that render a species vulnerable to acoustic disturbances, and the types of anthropogenic noise that are most likely to impact reproduction. Here, we provide predictions about noise impact on fish reproduction following a two-step approach: first, we grouped documented effects of noise into three mechanistic categories: stress, masking and hearing-loss, and test which type of noise (continuous vs intermittent and regular vs irregular) was most likely to produce a significant response in each category with either a meta-analysis or a quantitative review, depending on data availability. Second, we reviewed existing literature to predict which reproductive traits would render fish most sensitive to stress, masking and hearing-loss. In step one, we concluded that continuous sounds with irregular amplitude and/or frequency-content (e.g. heavy ship traffic) were most likely to cause stress, and continuous sounds were also most likely to induce masking and hearing-loss. From step two we concluded that the vulnerability of a species to noise-induced stress will mainly depend on: (1) its potential to reallocate reproduction to more quiet times or locations, and (2) its vulnerability to masking and hearing-loss mainly on the function of sound communication in its reproductive behaviour. We discuss in which stages of reproduction fish are most likely to be vulnerable to anthropogenic noise based on these findings.

Graphic abstract
Joint attention and perceptual experience
Authors: Battich Lucas , Geurts Bart
Published: March 2020

Joint attention customarily refers to the coordinated focus of attention between two or more individuals on a common object or event, where it is mutually “open” to all attenders that they are so engaged. We identify two broad approaches to analyse joint attention, one in terms of cognitive notions like common knowledge and common awareness, and one according to which joint attention is fundamentally a primitive phenomenon of sensory experience. John Campbell’s relational theory is a prominent representative of the latter approach, and the main focus of this paper. We argue that Campbell’s theory is problematic for a variety of reasons, through which runs a common thread: most of the problems that the theory is faced with arise from the relational view of perception that he endorses, and, more generally, they suggest that perceptual experience is not sufficient for an analysis of joint attention.
TeKET: a Tree-Based Unsupervised Keyphrase Extraction Technique
Authors: Rabby Gollam , Azad Saiful , Mahmud Mufti , Zamli Kamal Z. , Rahman Mohammed Mostafizur
Published: March 2020

Automatic keyphrase extraction techniques aim to extract quality keyphrases for higher level summarization of a document. Majority of the existing techniques are mainly domain-specific, which require application domain knowledge and employ higher order statistical methods, and computationally expensive and require large train data, which is rare for many applications. Overcoming these issues, this paper proposes a new unsupervised keyphrase extraction technique. The proposed unsupervised keyphrase extraction technique, named TeKET or Tree-based Keyphrase Extraction Technique, is a domain-independent technique that employs limited statistical knowledge and requires no train data. This technique also introduces a new variant of a binary tree, called KeyPhrase Extraction (KePhEx) tree, to extract final keyphrases from candidate keyphrases. In addition, a measure, called Cohesiveness Index or CI, is derived which denotes a given node’s degree of cohesiveness with respect to the root. The CI is used in flexibly extracting final keyphrases from the KePhEx tree and is co-utilized in the ranking process. The effectiveness of the proposed technique and its domain and language independence are experimentally evaluated using available benchmark corpora, namely SemEval-2010 (a scientific articles dataset), Theses100 (a thesis dataset), and a German Research Article dataset, respectively. The acquired results are compared with other relevant unsupervised techniques belonging to both statistical and graph-based techniques. The obtained results demonstrate the improved performance of the proposed technique over other compared techniques in terms of precision, recall, and F1 scores.
Linking field survey with crop modeling to forecast maize yield in smallholder farmers’ fields in Tanzania
Authors: Liu Lin , Basso Bruno
Published: March 2020

Short term food security issues require reliable crop forecasting data to identify the population at risk of food insecurity and quantify the anticipated food deficit. The assessment of the current early warning and crop forecasting system which was designed in mid 80’s identified a number of deficiencies that have serious impact on the timeliness and reliability of the data. We developed a new method to forecast maize yield across smallholder farmers’ fields in Tanzania (Morogoro, Kagera and Tanga districts) by integrating field-based survey with a process-based mechanistic crop simulation model. The method has shown to provide acceptable forecasts (r2 values of 0.94, 0.88 and 0.5 in Tanga, Morogoro and Kagera districts, respectively) 14–77 days prior to crop harvest across the three districts, in spite of wide range of maize growing conditions (final yields ranged from 0.2–5.9 t/ha). This study highlights the possibility of achieving accurate yield forecasts, and scaling up to regional levels for smallholder farming systems, where uncertainties in management conditions and field size are large.
Groundwater flow system understanding of the lukewarm springs in Kistapolca (South Hungary) and its relevance to hypogene cave formation
Authors: Erőss Anita , Csondor Katalin , Czuppon György , Dezső József , Müller Imre
Published: March 2020

Springs have an important role both in groundwater flow system understanding and in maintaining groundwater-related ecosystems. The aim of the research of the lukewarm karst springs in Kistapolca is to understand the origin of the elevated temperature (22–24 °C), i.e., whether it is the result of mixing of cold and thermal waters or it represents the terminal area of intermediate flow systems. This question has also an important relevance to the evaluation of recent cave formation in the area. In case of mixing of different waters dissolution by mixing corrosion could take place. This scenario was proposed for the formation of the Beremend Cave, which is situated in the close vicinity of the springs, and which is the only known cave of the area, where the passages are partly filled by water. Therefore, several methods, including geophysical, geochemical and stable isotope measurements, evaluation of continuous-time series of water level change, temperature, and electrical conductivity data and hydraulic evaluation of vertical flow conditions by pressure–elevation profiles were combined in order to acquire information about the hydrogeological environment and flow conditions in the area. The results show that a higher order flow system derived from the Villány Hills feeds the springs in Kistapolca without significant local influence. In addition, the results related to the Beremend Cave indicate that cave formation by mixing corrosion is not an active process today in the area, the cave is rather influenced by local processes.
Conceptualizing Individual and Household Disaster Preparedness: The Perspective from Cameroon
Authors: Nojang Emmanuel Nzengung , Jensen Jessica
Published: March 2020

This research explored the basic issue of what preparedness means and entails to people in Fako Division, Cameroon—a place threated by many hazards and that has experienced many disasters. Findings from the analysis of the 33 interviews conducted in this study indicate that preparedness is a dynamic state of readiness that is dependent on context, a social process, and a process of completing activities to save lives and minimize the effects of disasters. In addition, the research determined that Cameroonians view a wholly prepared person as someone who would: (1) have knowledge about hazards and what to do about them; (2) engage others, including their families and neighbors, in discussions about activities related to hazards; and (3) participate in activities to minimize loss from hazards, sustain themselves in the face of hazards, and flee from hazards. The findings from the interview data synchronize to a large extent with what is implied, but not clearly stated, in the existing research literature. The article addresses this synchrony, posits a definition of preparedness, and identifies the theoretical components of preparedness.
Erratum zu: Kontextsensitive Assistenzsysteme und Überwachung am Arbeitsplatz: Ein meta-analytisches Review zur Auswirkung elektronischer Überwachung auf Beschäftigte
Authors: Backhaus Nils
Published: March 2020

Der Artikel „Kontextsensitive Assistenzsysteme und Überwachung am Arbeitsplatz: Ein meta-analytisches Review zur Auswirkung elektronischer Überwachung auf Beschäftigte“ von Nils Backhaus wurde ursprünglich ohne „Open Access“ Online First auf der Internetplattform des Verlags publiziert. Nach der …
Psychosocial resources related to survival among non-robust community-dwelling older people: an 18-year follow-up study
Authors: Lavonius Sirkku , Salminen Marika , Vahlberg Tero , Isoaho Raimo , Kivelä Sirkka-Liisa , Wuorela Maarit , Löppönen Minna , Viitanen Matti , Viikari Laura
Published: March 2020

Purpose

Psychosocial resources have been considered to be associated with survival among frail older adults but the evidence is scarce. The aim was to investigate whether psychosocial resources are related to survival among non-robust community-dwelling older people.

Methods

This is a prospective study with 10- and 18-year follow-ups. Participants were 909 non-robust (according to Rockwood’s Frailty Index) older community-dwellers in Finland. Psychosocial resources were measured with living circumstances, education, satisfaction with friendship and life, visiting other people, being visited by other people, having someone to talk to, having someone who helps, self-rated health (SRH) and hopefulness about the future. To assess the association of psychosocial resources for survival, Cox regression analyses was used.

Results

Visiting other people more often than once a week compared to that of less than once a week (hazard ratio 0.61 [95% confidence interval 0.44–0.85], p = 0.003 in 10-year follow-up; 0.77 [0.62–0.95], p = 0.014 in 18-year follow-up) and good SRH compared to poor SRH (0.65 [0.44–0.97], p = 0.032; 0.68 [0.52–0.90], p = 0.007, respectively) were associated with better survival in both follow-ups. Visiting other people once a week (compared to that of less than once a week) (0.77 [0.62–0.95], p = 0.014) was only associated with better 18-year survival.

Conclusions

Psychosocial resources, such as regularly visiting other people and good self-rated health, seem to be associated with better survival among non-robust community-dwelling Finnish older people. This underlines the importance of focusing also on psychosocial well-being of frail older subjects to remain or promote their resilience.
Unfolding the Black Box of Questionable Research Practices: Where Is the Line Between Acceptable and Unacceptable Practices?
Authors: Linder Christian , Farahbakhsh Siavash
Published: March 2020

Despite the extensive literature on what questionable research practices (QRPs) are and how to measure them, the normative underpinnings of such practices have remained less explored. QRPs often fall into a grey area of justifiable and unjustifiable practices. Where to precisely draw the line between such practices challenges individual scholars and this harms science. We investigate QRPs from a normative perspective using the theory of communicative action. We highlight the role of the collective in assessing individual behaviours. Our contribution is a framework that allows identification of when particular actions cross over from acceptable to unacceptable practice. Thus, this article provides grounds for developing scientific standards to raise the quality of scientific research.
Using clinical decision support to improve urine culture diagnostic stewardship, antimicrobial stewardship, and financial cost: A multicenter experience
Authors: Watson Kaitlin J. , Trautner Barbara , Russo Hannah , Phe Kady , Lasco Todd , Pipkins Takei , Lembcke Bradley , Al Mohajer Mayar
Published: March 2020

Objective:

Despite evidence to the contrary, many practitioners continue to inappropriately screen for and treat bacteria in the urine of clinically asymptomatic patients. The purpose of this study was to evaluate the impact of a new order set on the number of urine culture performed, antibiotic days of therapy (DOT), catheter-associated urinary tract infections (CAUTI), and associated financial impact.

Design:

A quasi-experimental before-and-after intervention.

Setting:

We conducted this study at 5 Catholic Health Initiative (CHI) hospitals in Texas that use the same electronic health record (EHR) system.

Patients:

The study populations included adult patients who had urine culture performed from June 2017 to June 2019.

Intervention:

The intervention (implemented June 25, 2018) was the addition of a new order set in the electronic health record that required practitioners to choose an indication for the type of urine study. The primary outcome was number of urine cultures performed adjusted for the number of total patient days.

Results:

Following implementation of the new order set, the number of urine cultures performed among the 5 sites decreased from 1,175.8 tests per 10,000 patient days before the intervention to 701.4 after the intervention (40.4% reduction;P< .01). Antibiotic DOT for patients with a urinary tract infection indication decreased from 102.5 to 86.9 per 1,000 patient days (15.2% reduction;P< .01). The CAUTI standardized infection ratio was 1.0 before the intervention and 0.8 after the intervention (P= .23). The estimated yearly savings following the intervention was US$535,181.

Conclusions:

The addition of a new order set resulted in decreases in the number of urine cultures performed and the antibiotic DOT, as well as substantial financial savings.
Robert Skidelsky Money and Government: The Past and Future of Economics
Authors: Rockoff Hugh
Published: March 2020

Robert Skidelsky, a historian whose fame for his monumental biography of John Maynard Keynes is well deserved, here provides us with a brilliant, well-informed history of macroeconomics stretching from the “British recoinage debates” of the 1690s to today. Money and Government was prompted by the 2008 financial crisis. It is an attempt, Skidelsky tells us, to answer the question that Queen Elizabeth II posed to a group of economists at the London School of Economics in October 2008: “Why did no one see it coming?” Not surprisingly, to skip to the bottom line, Skidelsky believes that macroeconomics reached its apogee with Keynes and that it has been more or less downhill from there. The 2008 financial crisis could have been predicted, and ameliorated after it occurred if not prevented, if macroeconomists had remained loyal to Keynes.
Freedom of Movement, Access to the Urban Centres, and Abolition of Slavery in the French Caribbean
Authors: Pluskota Marion
Published: March 2020

How did the abolition of slavery influence the relations between urban centres and rural areas? How did “new” French citizens experience access to the urban environment? Based on the archives of the correctional courts, this article focuses on how race and citizenship determined the accessibility of French colonial urban spaces and institutions after 1848. The abolition of slavery in the French Antilles on 27 April 1848 led to a modification of the legal and judicial systems: the changing legal status of former slaves gave them new opportunities to move around the colonies, at least on paper. In theory, after 1848, everyone should have had freedom of social and spatial mobility and access to the urban centres and their institutions; what happened in practice, however, still needs to be researched. This article shows that the abolition exacerbated two dynamics already at play since the beginning of the nineteenth century: the control of the population and the attraction of the urban environment for the elite. The plantation system in the mid-nineteenth century was suffering both economically and politically: the newly acquired freedom and possible migration of former slaves to the towns (Saint-Pierre and Fort-de-France in Martinique, Pointe-à-Pitre and Basse-Terre in Guadeloupe) threatened to destabilize the system of private justice as well as the economic apparatus. To counteract these legal changes, vagrancy laws were implemented to restrict citizens’ mobility while, at the same time, the white elite's discourse on urban spaces changed from them being seen as a hotbed for revolutionary ideas to representing a safe environment to which access needed to be restricted.
Low and reduced carbohydrate diets: challenges and opportunities for type 2 diabetes management and prevention
Authors: Churuangsuk Chaitong , Lean Michael E. J. , Combet Emilie
Published: March 2020

Low-carbohydrate diets (LCD) have been promoted for weight control and type 2 diabetes (T2D) management, based on an emerging body of evidence, including meta-analyses with an indication of publication bias. Proposed definitions vary between 50 and 130 g/d, or <10 and <40 % of energy from carbohydrate, with no consensus on LCD compositional criteria. LCD are usually followed with limited consideration for other macronutrients in the overall diet composition, introducing variance in the constituent foods and in metabolic responses. For weight management, extensive evidence supports LCD as a valid weight loss treatment, up to 1–2 years. Solely lowering carbohydrate intake does not, in the medium/long term, reduce HbA1c for T2D prevention or treatment, as many mechanisms interplay. Under controlled feeding conditions, LCD are not physiologically or clinically superior to diets with higher carbohydrates for weight-loss, fat loss, energy expenditure or glycaemic outcomes; indeed, all metabolic improvements require weight loss. Long-term evidence also links the LCD pattern to increased CVD risks and mortality. LCD can lead to micronutrient deficiencies and increased LDL-cholesterol, depending on food selection to replace carbohydrates. Evidence is limited but promising regarding food choices/sources to replace high-carbohydrate foods that may alleviate the negative effects of LCD, demanding further insight into the dietary practice of medium to long term LCD followers. Long-term, high-quality studies of LCD with different food sources (animal and/or plant origins) are needed, aiming for clinical endpoints (T2D incidence and remission, cardiovascular events, mortality). Ensuring micronutrient adequacy by food selection or supplementation should be considered for people who wish to pursue long-term LCD.
Bushmeat hunting around Lomami National Park, Democratic Republic of the Congo
Authors: Batumike Rodrigue , Imani Gerard , Urom Christian , Cuni-Sanchez Aida
Published: March 2020

For most of the Democratic Republic of the Congo quantitative data on bushmeat exploitation are scarce. We conducted focus group discussions on preferred species for household consumption and income generation in 24 villages around Lomami National Park, created in 2016. We also carried out a bushmeat market survey in Kindu, a major town in the study area, to estimate annual sales volumes and retail values. Villagers reported household consumption of 22 mammal species, with the most important being the African brush-tailed porcupine, Peters's duiker, bay duiker and red river hog. The latter three were also the most important for income generation. A greater number of smaller species were consumed at the household level, compared with those traded. A total of 17 mammal and one reptile species were traded in Kindu. Those traded in greater numbers were the African brush-tailed porcupine, blue and bay duiker, red river hog, red-tailed monkey and the sitatunga. We estimated > 40,000 carcasses were traded in Kindu annually, with a retail value of USD 725,000. Several species of conservation concern, such as the bonobo, were mentioned or observed. Few rodents and numerous large animals were traded in Kindu, suggesting resources have not yet been depleted. However, both villagers and urban vendors perceived a decline of many species and reported an increase in the use of firearms and the number of foreign hunters in the area. Among other interventions, we discuss how local communities could be encouraged to help preserve wildlife in the Park's buffer zone.
HONEST CONFIDENCE SETS IN NONPARAMETRIC IV REGRESSION AND OTHER ILL-POSED MODELS
Authors: Babii Andrii
Published: March 2020

This article develops inferential methods for a very general class of ill-posed models in econometrics encompassing the nonparametric instrumental variable regression, various functional regressions, and the density deconvolution. We focus on uniform confidence sets for the parameter of interest estimated with Tikhonov regularization, as in Darolles et al. (2011,Econometrica79, 1541–1565). Since it is impossible to have inferential methods based on the central limit theorem, we develop two alternative approaches relying on the concentration inequality and bootstrap approximations. We show that expected diameters and coverage properties of resulting sets have uniform validity over a large class of models, that is, constructed confidence sets are honest. Monte Carlo experiments illustrate that introduced confidence sets have reasonable width and coverage properties. Using U.S. data, we provide uniform confidence sets for Engel curves for various commodities.
Peritoneal dialysis during congenital heart surgery admissions: insights from a large database
Authors: Loomba Rohit S. , Villarreal Enrique G. , Bronicki Ronald A. , Flores Saul
Published: March 2020

Background:

The management of fluid overload after congenital heart surgery has been limited to diuretics, fluid restriction, and dialysis. This study was conducted to determine the association between peritoneal dialysis and important clinical outcomes in children undergoing congenital heart surgery.

Methods:

A retrospective review was conducted to identify patients under 18 years of age who underwent congenital heart surgery. The data were obtained over a 16-year period (1997–2012) from the Kids’ Inpatient Database. Data analysed consisted of demographics, diagnoses, type of congenital heart surgery, length of stay, cost of hospitalisation, and mortality. Logistic regression was performed to determine factors associated with peritoneal dialysis.

Results:

A total of 46,176 admissions after congenital heart surgery were included in the study. Of those, 181 (0.4%) utilised peritoneal dialysis. The mean age of the peritoneal dialysis group was 7.6 months compared to 39.6 months in those without peritoneal dialysis. The most common CHDs were atrial septal defect (37%), ventricular septal defect (32.6%), and hypoplastic left heart syndrome (18.8%). Univariate analyses demonstrated significantly greater length of stay, cost of admission, and mortality in those with peritoneal dialysis. Regression analyses demonstrated that peritoneal dialysis was independently associated with significant decrease in cost of admission (−$57,500) and significant increase in mortality (odds ratio 1.5).

Conclusions:

Peritoneal dialysis appears to be used in specific patient subsets and is independently associated with decreased cost of stay, although it is associated with increased mortality. Further studies are needed to describe risks and benefit of peritoneal dialysis in this population.
University Rankings: Quality, Size and Permanence
Authors: Bejan Adrian , Gunes Umit , Sahin Bahri
Published: March 2020

Why are the rankings of universities not changing? Why is the demographic composition of top universities the same? In this review, these questions are addressed based on physics. Although size matters, higher ranks do not correlate with bigger sizes. The higher ranks belong to universities that have more authors who receive more citations. Citations are a record of how ideas spread from the source to the whole globe, in accordance with the physics of the logistics S-curve phenomenon. The spreading occurs in three periods – slow, fast, slow – and the population served by each idea during its lifetime depends on the size of the first big channel that carries the idea. An idea from a famous university has a larger spreading territory around it than an idea from a lesser-known university. Creativity is key: rankings come from visibility through citations, and, in turn, visibility for an author is aided by the higher visibility of the university. The demographic composition of the top universities is the same: for instance, the percentage of female authors and authors of East Asian origin among the 200 most cited authors does not vary significantly over the 20 highest ranked universities.
Use of concurrent evaluation to improve implementation of a home fortification programme in Bangladesh: a methodological innovation
Authors: Sarma Haribondhu , Uddin Md. Fakhar , Islam Mohammad Ashraful , Rahman Mahfuzur , Aaron Grant J , Harbour Catherine , Banwell Cathy , Ahmed Tahmeed
Published: March 2020

Objective:

This paper focuses on the use of ‘concurrent evaluation’ to evaluate a nationally scaled-up programme in Bangladesh that was implemented by BRAC (an international development organisation) using Shasthya Shebika (SS) – volunteer community health workers – to promote home fortification with micronutrient powders (MNP) for children under-five.

Design:

We developed a programme impact pathway to conceptualise the implementation and evaluation strategy and developed a strategic partnership among the key programme stakeholders for better use of evaluation evidence. We developed a multi-method concurrent evaluation strategy to provide insights into the BRAC programme and created provision for course correction to the implementation plan while it was in operation.

Setting:

One hundred sixty-four sub-districts and six urban slums in Bangladesh.

Participants:

Caregivers of children 6–59 months, SS and BRAC’s staff members.

Results:

The evaluation identified low awareness about home fortification among caregivers, inadequate supply and frequent MNP stockouts, and inadequate skills of BRAC’s SS to promote MNP at the community level as hindrances to the achievement of programme goals. The partners regularly discussed evaluation results during and after implementation activities to assess progress in programme coverage and any needs for modification. BRAC initiated a series of corrections to the original implementation plan to address these challenges, which improved the design of the MNP programme; this resulted in enhanced programme outcomes.

Conclusions:

Concurrent evaluation is an innovative approach to evaluate complex real-world programmes. Here it was utilised in implementing a large-scale nutrition programme to measure implementation process and effectiveness.
High Rates of Deep Earthquake Dynamic Triggering in the Thermal Halos of Subducting Slabs
Authors: Luo Yantao , Wiens Douglas A.
Published: March 2020

Observations of remote dynamic triggering of intermediate and deep (I&D) earthquakes can potentially clarify the faulting process but have not been systematically compiled. We relocate earthquakes following the two largest recent deep earthquakes with a multiple‐event location algorithm and compile a comprehensive catalog of dynamically triggered I&D earthquakes from 1964 to 2015. We find 119 large I&D earthquakes that likely dynamically triggered aftershocks at distances between two mainshock fault lengths and 400 km during the first 4 days following these mainshocks. Dynamic triggering is more common for deep than for intermediate depth earthquakes and is overrepresented in areas with low seismicity that are adjacent to slabs, which suggest that subducting slabs in the transition zone are surrounded by material that is critically stressed but warm enough to inhibit rupture initiation. The passage of seismic waves may initiate runaway ductile shear failure, which nucleates over a period of minutes to days.
Nanosized Authigenic Magnetite and Hematite Particles in Mature‐Paleosol Phyllosilicates: New Evidence for a Magnetic Enhancement Mechanism in Loess Sequences of China
Authors: Hyodo Masayuki , Sano Takuroh , Matsumoto Megumi , Seto Yusuke , Bradák Balázs , Suzuki Kota , Fukuda Jun‐ichi , Shi Meinan , Yang Tianshui
Published: March 2020

Magnetic enhancement of Chinese loess‐paleosol sequences has been used extensively as a proxy for East Asian summer monsoon variations. However, the pedogenic magnetic particles contributing to this magnetic enhancement are difficult to extract, so it is not clear how they formed. In this study, we reveal pedogenic magnetite and hematite using electron microscopy, synchrotron radiation X‐ray diffraction, and rock magnetic methods. First‐order reversal curves indicate that superparamagnetic/single domain/vortex state magnetic properties dominated both loess and paleosol samples. Samples of muscovite and chlorite, which are paramagnetic, have weak spontaneous magnetization. The 1‐ to 10‐μm‐sized fraction of host silicatesis responsible for most of the magnetic enhancement of paleosols. In the paleosol fraction, we found weathered phyllosilicates (muscovite/chlorite), including many elongated submicron to a few microns authigenic magnetite and hematite particles between layers; however, few such interlayer particles were found in phyllosilicates of the loess fraction. The concentration of magnetite/hematite particles within paleosol muscovite/chlorite grains and in aggregates of phyllosilicate fragments is much higher than that of the submicron iron oxides found on silicate surfaces. Interlayer magnetite particles are dominantly prism‐shaped with aspect ratios >~4. The authigenic magnetite must be mainly responsible for the spontaneous magnetization of the muscovites and chlorites and the paleosol magnetic properties. The protective silicates account for the low extraction efficiency and also the near absence of surface oxidation of pedogenic magnetite. Based on our results, we suggest that magnetite/hematite in weathered phyllosilicates contribute significantly to the magnetic enhancement of mature paleosols.
Slab Rollback Versus Delamination: Contrasting Fates of Flat‐Slab Subduction and Implications for South China Evolution in the Mesozoic
Authors: Dai Liming , Wang Liangliang , Lou Da , Li Zhong‐Hai , Dong Hao , Ma Fangfang , Li Fakun , Li Sanzhong , Yu Shengyao
Published: March 2020

Growing evidence supports that the widely developed Mesozoic folds and magmatism in the South China Block are attributed to the flat‐slab subduction, followed by slab steepening, of the Paleo‐Pacific Plate (PPP). However, the dynamics of the transition from flat‐ to steep‐slab subduction, as well as the relationship between tectonic processes and surface deformation and magmatic events, are poorly constrained. Using a 2‐D thermomechanical numerical model, we systematically investigate the effects of slab rollback or delamination following the eclogitization of a subducted oceanic plateau on the surficial topography, structural deformation, and magmatism. Our results indicate that the subduction of an oceanic plateau drives flat‐slab subduction, which further leads to the development of a wide thrust fault zone, an uplifted and magmatically active foreland, and the foreland basin subsidence. This model is further complicated by the transition from flat‐ to steep‐slab subduction through slab rollback or delamination which is controlled by the subduction rate and the timing of oceanic plateau eclogitization. The comparisons between our numerical results and the geological data from South China reveal that the slab delamination model reproduces the regional evolution of the Mesozoic South China. Based on our models, we suggest that the eclogitization during flat‐slab subduction is not instantaneous, which is instead at least 18 Myr after the oceanic plateau reaches the ideal conditions of phase change.
The Effect of Water on Ionic Conductivity in Olivine
Authors: Fei Hongzhan , Druzhbin Dmitry , Katsura Tomoo
Published: March 2020

High‐temperature ionic conductivity in olivine single crystals has been measured in the [100], [010], and [001] crystallographic orientations as a function of pressure from 2 to 10 GPa, temperature from 1450 to 2180 K, and H2O content from 20 to 580 wt. ppm using multianvil presses with in situ impedance analyses. The experimental results yield an activation energy, activation volume, and H2O content exponent of 250–405 kJ/mol, 3.2–5.3 cm3/mol, and 1.3 ± 0.2, respectively, for the high‐temperature ionic conduction regime. Olivine ionic conductivity has negative pressure and positive temperature dependences and is significantly enhanced by H2O incorporation. The [001] direction is more conductive than the [100] and [010] directions. The H2O‐enhanced ionic conductivity may contribute significantly to the electrical conductivity profile in the asthenosphere, especially in the regions under relatively high‐temperature and low‐pressure conditions.
Time Evolution of Satellite‐Based Optical Properties in Lightning Flashes, and its Impact on GLM Flash Detection
Authors: Zhang Daile , Cummins Kenneth L.
Published: March 2020

The GOES‐16 Geostationary Lightning Mapper (GLM) detection efficiency (DE) is studied over a full year (2018/19) in central Florida using the Kennedy Space Center Lightning Mapping Array (KSC LMA). Mean daily flash DE was 73.8%, and detection was highest during nighttime hours. GLM reported 86.5% of the LMA flashes that had coincident cloud‐to‐ground return strokes reported by the U.S. National Lightning Detection Network. Results also reveal that flash size and duration are critical parameters influencing GLM detection, regardless of the storm type, with 20–40% detection for small and short‐duration flashes and greater than 95% detection for very large and long‐duration flashes.

These findings can be explained by examining the time‐evolution of cloud‐top optical emissions observed by the Lightning Imaging Sensor (LIS). Statistical simulations based on long‐term LIS group area observations indicate that about half of the above‐threshold light sources are smaller than a LIS pixel (~ 4 × 4 km) and are smallest during and just after an initial breakdown in IC flashes. This work also demonstrates that for sources smaller than a GLM pixel, the cloud‐top energy detection threshold for GLM is double that for LIS despite GLM's lower energy density threshold. Overall, these findings provide a framework for interpreting GLM performance under varying meteorological conditions, and help explain reports of low flash detection efficiency for storms associated with severe weather, as they typically exhibit high flash rates and resulting small and short‐duration flashes.
Toward a Realistic Representation of Global Electric Circuit Generators in Models of Atmospheric Dynamics
Authors: Ilin Nikolay V. , Slyunyaev Nikolay N. , Mareev Evgeny A.
Published: March 2020

The diurnal variation of the global electric circuit (GEC) is simulated using the Weather Research and Forecasting model by estimating contributions of grid columns to the ionospheric potential (IP). A parameterization based on cutting off the grid columns with shallow convection and estimating the area covered by GEC generators (electrified clouds) in each column from the amount of precipitation yields the IP variation of the same shape as the classical Carnegie curve with a correlation coefficient of 0.97, although with a smaller peak‐to‐peak amplitude (18% against 34% of the mean) and maxima and minima shifted by 1–2 hr. It is shown that omission in the IP parameterization of either convective activity or the area covered by electrified clouds (estimated using the calculated precipitation) would result in poor similarity between the modeled IP variation and the classical Carnegie curve. The results of simulation show the best agreement with the Carnegie data during Northern Hemisphere winters; the shape of the simulated diurnal variation of the IP substantially changes throughout the year owing to the decrease of South America's contribution and the increase of Southern Asia's contribution in summer. The discrepancies between the results of modeling and the results of observations are probably caused by the limited ability of large‐scale models to differentiate between electrified and nonelectrified clouds. Further improvement of the parameterization of the IP in models of atmospheric dynamics requires using finer grids, which should allow computing microphysical characteristics of clouds and estimating source currents more accurately.
Nonlinear Coupling of Carbon and Nitrogen Release During Litter Decomposition and its Responses to Nitrogen Addition
Authors: Pei Guangting , Liu Jun , Peng Bo , Wang Chao , Jiang Ping , Bai Edith
Published: March 2020

During decomposition of plant litter, it remains unclear whether carbon (C) and nitrogen (N) are released at similar proportional rates, which hinders our prediction of soil C and N dynamics under the context of global changes. Here, we investigated the relationships between C and N release and their responses to N addition (5 g N m−2 yr−1) to better understand this question. Litter gross N release and immobilization were differentiated by the 15N‐labeling technique. Results showed that the linear relationship between gross N release and C release followed the 1:1 line during the first year but then deviated above the 1:1 line for three types of the four studied litters. Nitrogen addition did not change this relationship, showing an inhibition effect on both C and N releases from the N‐rich foliar litter at the later stage. The inhibition effect of N addition was not found in the N‐poor twig litter, indicating that initial litter N interacted with deposited N to affect litter N release. We propose a novel conceptual model to describe that under N addition, the decrease in gross N release caused a decline in net N release from N‐rich litter, while a decline in net N release from N‐poor litter was due to the increase in gross N immobilization. These findings point to the importance of differentiating the gross N release and immobilization processes for understanding the response of litter N cycling to increasing N deposition and the relationships between C and N release during different stages of litter decomposition.
Representative Elementary Volumes, Hysteresis, and Heterogeneity in Multiphase Flow From the Pore to Continuum Scale
Authors: Jackson S. J. , Lin Q. , Krevor S.
Published: March 2020

Representative elementary volumes (REVs) and heterogeneity are key concepts in continuum multiphase flow, yet their manifestation from the pore‐scale and associated impacts with the flow regime are not well understood. We use a multi‐scale experimental and modeling approach to elucidate the role of REVs, hysteresis, and heterogeneity in multiphase flow in two distinct water‐wetting Bentheimer sandstones. Experimental observations during steady‐state drainage and imbibition resolve the pore space at 6 
m across a field of view up to 12 
 65 mm with simultaneous measurements of differential pressure during fluid flow. The REV for porosity and capillary pressure is
2 mm
for both samples, with 5% relative uncertainty. In contrast, due to macroscopic capillary pressure heterogeneities, the REV for saturation varies between 3.4 and 157.5 mm
, dependent on the fractional flow. Accurate knowledge of this REV uncertainty is critical in assessing continuum scale model validity and predictiveness. We validate the Land trapping model directly by predicting observed non‐wetting fluid connectivity at multiple imbibition states to within the REV uncertainty for homogeneous media. With this, observed hysteresis in the measured relative permeability is entirely removed when considering the connected saturation, validating conceptual hysteresis models based on connected pathway flow. REV scale heterogeneities in capillary pressure are shown to impact flow and trapping characteristics; when built into 3D continuum scale numerical models with hysteresis we are able to predict the variations in trapping and relative permeability observed between the two samples with different heterogeneity structures. The experimental data set herein provides an excellent benchmark for future development of continuum scale modeling frameworks.
Spatial and Temporal Patterns in Baseflow Recession in the Continental United States
Authors: Tashie Arik , Pavelsky Tamlin , Emanuel Ryan E.
Published: March 2020

Baseflow is often treated according to a unique storage‐discharge relationship. However, recent innovations in baseflow recession analysis have allowed novel findings regarding the variability of both the stability of baseflow and its nonlinearity (i.e., the concavity of the hydrograph), as well as the regional clustering of these characteristics. We investigate spatial and temporal patterns in the character of baseflow recession for over 1,000 watersheds in the continental United States. We discover seasonal patterns in both the stability and nonlinearity of baseflow which vary systematically across large regions. Further, we relate these baseflow characteristics to their potential physical drivers, including estimates of evapotranspiration, watershed storage, the distribution of watershed storage, and precipitation. While coincident watershed storage is the best predictor of baseflow stability in many regions (particularly the Appalachian Mountains), evapotranspiration from 2 to 3 months previous is the best predictor of baseflow stability in other regions (particularly the Pacific Northwest). We also discuss the novel finding that baseflow nonlinearity has increased significantly in most watersheds across the United States since 1980.
Hippocampal TNF-death receptors, caspase cell death cascades, and IL-8 in alcohol use disorder
Authors: Liu Wen , Vetreno Ryan P. , Crews Fulton T.
Published: March 2020

The relationship between increased neuroimmune gene expression and hippocampal degeneration in alcohol use disorder (AUD) and other mental diseases is poorly understood. We report here that tumor necrosis factor receptor superfamily death receptor 3 (TNFRSF25, DR3) and Fas receptors (Fas) that initiate caspase cell death cascades are increased in AUD hippocampus and following a rat adolescent binge drinking model. Death receptors are known inducers of apoptosis and cell death that recruit death domain (DD) proteins FADD and TRADD and caspases to form death-inducing signaling complexes (DISC). In postmortem human AUD hippocampus, mRNA and IHC protein are increased for the entire death receptor cascade. In AUD hippocampus, ligand–death receptor pairs, i.e., TL1A-DR3 and FasL–Fas, were increased, as well as FADD and TRADD, and active caspase-8, -7, -9, and caspase-3. Further, pNFκB p65, a key neuroimmune transcription factor, and IL-8, a chemokine, were significantly increased. Interestingly, across AUD patients, increases in DR3 and Fas correlated with TRADD, and TRADD with active caspase+IR and IL-8+IR, consistent with coordinated activation of neuronal DISC mediated death cascades and neuroimmune gene induction in AUD. These findings support a role for DR3 and Fas neuroimmune signaling in AUD hippocampal neurodegeneration.