bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Facile and Effective Method for Patching Sulfur Vacancies of WS2 via Nitrogen Plasma Treatment
Authors: Jiang Jianfeng , Zhang Qinghua , Wang Aizhu , Zhang Yu , Meng Fanqi , Zhang Congcong , Feng Xianjin , Feng Yuanping , Gu Lin , Liu Hong , Han Lin 
Published: June 2019

AbstractAlthough transition metal dichalcogenides (TMDs) are attractive for the next‐generation nanoelectronic era due to their unique optoelectronic and electronic properties, carrier scattering during the transmission of electronic devices, and the distinct contact barrier between the metal and the semiconductors, which is caused by inevitable defects in TMDs, remain formidable challenges. To address these issues, a facile, effective, and universal patching defect approach that uses a nitrogen plasma doping protocol is developed, via which the intrinsic vacancies are repaired effectively. To reveal sulfur vacancies and the nature of the nitrogen doping effects, a high‐resolution spherical aberration corrected scanning transmission electron microscopy is used, which confirms the N atoms doping in sulfur vacancies. In this study, a typical TMD material, namely tungsten disulfide, is employed to fabricate field‐effect transistors (FETs) as a preliminary paradigm to demonstrate the patching defects method. This doping method endows FETs with high electrical performance and excellent contact interface properties. As a result, an electron mobility of up to 184.2 cm2 V−1 s−1 and a threshold voltage of as low as 3.8 V are realized. This study provides a valuable approach to improve the performance of electronic devices that are based on TMDs in practical electronic applications.
Heavy neutrinos with dynamic jet vetoes: multilepton searches at $$ \sqrt{s}=14 $$, 27, and 100 TeV
Authors: Pascoli Silvia , Ruiz Richard , Weiland Cedric 
Published: June 2019

Abstract

Heavy neutrinos (N) remain one of most promising explanations for the ori-gin of neutrinos’ tiny masses and large mixing angles. In light of broad advances in un-derstanding and modeling of hadron collisions at large momentum transfers, we revisit the long-standard search strategy for heavy N decaying to multiple charged leptons (ℓ), pp → NℓX → 3ℓνX. For electroweak and TeV-scale N, we propose a qualitatively new collider analysis premised on a dynamic jet veto and discriminating, on an event-by-event basis, according to the relative amount of hadronic and leptonic activity. We report that the sensitivity to heavy neutrinos at the CERN Large Hadron Collider (LHC) can be improved by roughly an order of magnitude at both ℒ = 300 fb−1 and 3 ab−1. At

$$ \sqrt{s}=14 $$

s

=
14

TeV with ℒ = 3 ab−1, we find active-sterile mixing as small as |V

ℓN
|2 = 10− 2(10− 3) [5 × 10− 4] can be probed at 95% CL for heavy Dirac neutrinos masses m

N
≲ 1200 (300) [200] GeV, well beyond the present |V

ℓN
|2 ≲ 10− 3 − 10− 1 constraints for such heavy states set by indirect searches and precision measurements. The improvement holds also for Majorana N, and is largely independent of whether charged lepton flavor is conserved or violated. The analysis, built almost entirely from inclusive, transverse observables, is designed to be robust across increasing collider energies, and hence serves as a basis for searches at future colliders: with ℒ = 15ab
− 1 at

$$ \sqrt{s} = 27 $$

s

=

27

TeV,onecanprobemixingbelow |V

ℓN
|2 = 10− 2(10− 3)[2 × 10− 4] for m

N
≲ 3500 (700) [200] GeV. At a hypothetical 100 TeV pp collider with ℒ = 30 ab
− 1, one can probe mixing down to 9 × 10−5 for m

N
≲ 200 GeV, below 10−3 for m

N
≲ 4 TeV, and below 10−2 for m

N
≲ 15 TeV. We anticipate these results can be further improved with detector-specific tuning and application of multi-variant / machines learning techniques. To facilitate such investigations, we make publicly available Monte Carlo libraries needed for the precision computations/simulations used in our study.
Modular forms and SL(2, ℤ)-covariance of type IIB superstring theory
Authors: Green Michael B. , Wen Congkao 
Published: June 2019

Abstract

The local higher-derivative interactions that enter into the low-energy expansion of the effective action of type IIB superstring theory with constant complex modulus generally violate the U(1) R-symmetry of IIB supergravity by q

U
units. These interactions have coefficients that transform as non-holomorphic modular forms under SL(2, ℤ) transformations with holomorphic and anti-holomorphic weights (w, −w), where q

U
= −2w.
In this paper SL(2, ℤ)-covariance and supersymmetry are used to determine first-order differential equations on moduli space that relate the modular form coefficients of classes of BPS-protected maximal U(1)-violating interactions that arise at low orders in the lowenergy expansion. These are the moduli-dependent coefficients of BPS interactions of the form d

2p

$$ \mathcal{P} $$

P

n
in linearised approximation, where

$$ \mathcal{P} $$

P

n
is the product of n fields that has dimension = 8 with q

U
= 8 − 2n, and p = 0, 2 or 3. These first-order equations imply that the coefficients satisfy SL(2, ℤ)-covariant Laplace eigenvalue equations on moduli space with solutions that contain information concerning perturbative and non-perturbative contributions to superstring amplitudes. For p = 3 and n ≥ 6 there are two independent modular forms, one of which has a vanishing tree-level contribution.
The analysis of super-amplitudes for U(1)-violating processes involving arbitrary numbers of external fluctuations of the complex modulus leads to a diagrammatic derivation of the first-order differential relations and Laplace equations satisfied by the coefficient modular forms. Combining this with a SL(2, ℤ)-covariant soft axio-dilaton limit that relates amplitudes with different values of n determines most of the modular invariant coefficients, leaving a single undetermined constant.
Primary Aldosteronism: Does Underlying Pathology Impact Clinical Presentation and Outcomes Following Unilateral Adrenalectomy?
Authors: Shariq Omair A. , Mehta Kabir , Thompson Geoffrey B. , Lyden Melanie L. , Farley David R. , Bancos Irina , Dy Benzon M. , Young William F. , McKenzie Travis J. 
Published: June 2019

AbstractIntroductionPatients undergoing unilateral adrenalectomy for primary aldosteronism (PA) may have a solitary adenoma, unilateral hyperplasia, or multiple adenomas on final pathology. This study investigated whether the underlying pathological diagnosis was associated with differences in clinical presentation and postoperative outcomes.MethodsA retrospective cohort study of patients undergoing unilateral adrenalectomy for PA from 2004 to 2015 at our institution was performed. Baseline clinical and laboratory parameters, as well as postoperative biochemical and hypertension cure rates, were compared across the three aforementioned pathological groups.ResultsOf 206 patients who met criteria for inclusion, 152 (73.8%) had a single adenoma, 33 (16%) had unilateral hyperplasia, and 21 (10.2%) had multiple unilateral adenomas. Patients with unilateral hyperplasia were more likely to be male (81.2% vs 57.9%, P = .03), undergo left‐sided adrenalectomy (78.8% vs 47.4%, P < .01), and had a lower median adrenal venous sampling lateralization index (9.8 vs 19.8, P = .04) compared to those with solitary, but not multiple unilateral adenomas. No differences were seen in age, duration of hypertension, preoperative plasma aldosterone levels, plasma renin activities, 24‐h urinary aldosterone excretion, serum potassium concentrations, and the number of preoperative antihypertensive medications across all three pathological groups. All patients achieved biochemical cure following adrenalectomy, and no significant differences in the rates of hypertension cure or improvement were observed in comparisons across pathological subtype.ConclusionsClinical presentation and postoperative outcomes are similar regardless of underlying pathology in patients with PA. Because one in four patients may harbor unilateral hyperplasia or multiple adenomas, total unilateral adrenalectomy should be performed as the operation of choice over adrenal‐sparing approaches.
Grand corruption and government change: an analysis of partisan favoritism in public procurement
Authors: Dávid-Barrett Elizabeth , Fazekas Mihály 
Published: June 2019

AbstractIncoming governments sometimes abuse their power to manipulate the allocation of government contracts so as to buy loyalty from cronies. While scandals suggest such practices are relatively widespread, the extent of such partisan favoritism is difficult to measure and the conditions under which it flourishes under-theorized. Drawing on theory regarding the role of institutions as constraints on corruption, we identify three spheres of political influence over government contracting and show how elites can manipulate two of those spheres to increase their opportunities to influence the procurement process and minimize external accountability, facilitating the corrupt allocation of contracts to partisan allies. Using an innovative big data methodology, we then identify the effects of a change in government on procurement markets in two countries, Hungary and the United Kingdom, which differ in terms of political influence over these institutions. We find that politically-favored companies secure 50–60% of the central government contracting market in Hungary but only 10% in the UK.
Molecular diagnostics of Mendelian disorders via combined DNA and RNA sequencing
Authors: Prokisch Holger 
Published: June 2019

Abstract
The diagnostic yield in rare disorders is currently less than 50% although sequencing technologies in use are able to detect the majority of possible variants in our genome. The diagnostic gap is in part due to limitations in prioritizing and interpreting identified variants. The integration of functional data, such as transcriptomics, is emerging as a powerful complementary tool in diagnostics. It is able to quantify aberrant splicing, validate nonsense-mediated mRNA decay for potential loss-of-function variants, identify mono-allelically expressed variants, and help prioritize variants not predicted to change the encoded protein. Moreover, RNA-sequencing has been validated as a tool for the discovery of pathogenic variants in novel Mendelian disease genes. As RNA sequencing provides complementary information to DNA sequencing and can easily be established in addition to DNA sequencing, it has great potential for implementation as a routine tool for improving molecular diagnosis.
The Reliability of Noninvasive Blood Pressure Measurement Through Layers of Autumn/Winter Clothing: A Prospective Study
Authors: Wołoszyn Przemysław , Baumberg Ignacy , Baker David 
Published: June 2019

Introduction In recent years a number of publications have appeared describing noninvasive blood pressure (NIBP) measurement with 1 layer of light cloth between the patient's skin and the NIBP cuff. In this study we investigated the reliability of NIBP measurements performed through 2 and 3 layers of autumn/winter clothing in 2 research groups: healthy volunteers and patients. Methods Oscillometric NIBP measurements were made in a random order: 1) on the exposed arm; 2) on the arm covered by a standardized cotton and polar fabric test sleeve; and 3) with the arm covered by a cotton–polar fabric and down jacket test sleeve. The time taken for measurement was also recorded. Results We performed measurement in 101 volunteers and 50 patients and found no clinically or statistically significant differences in NIBP. Mean±SD values in the volunteer group were 1) 130/80±14/8 mm Hg; 2) 130/81±15/8 mm Hg; and 3) 128/81±14/8 mm Hg. In the patient group the values were 1) 140/82±34/15 mm Hg; 2) 140/84±33/15 mm Hg; and 3) 137/84±32/15 mm Hg. Measuring over a sleeved arm extended the time of measurement by an average of 3.5 s in comparison with bare arm measurement. Conclusions Our findings confirm that it is possible to perform reliable NIBP measurements over 2 and 3 layers of autumn/winter clothing. Measuring NIBP with a clothed arm does not show clinical or statistically significant differences in comparison with measurements performed on the bare arm.
How Do Remittances Shape Electoral Strategies Back Home? Evidence from Mexico’s 2006 Presidential Election
Authors: Álvarez-Mingote Cristina 
Published: June 2019

ABSTRACTHow does international migration affect political parties’ electoral strategies in the sending countries? This article argues that remittances help political parties decide whom to target during elections. Drawing from theories of vote targeting and those on the effects of remittances, this study addresses how political parties’ electoral strategies follow the specific characteristics of remittance recipients. Using individual-level data from Mexico’s 2006 presidential elections, the results show that receiving remittances had a significant impact on experiencing electoral targeting, especially by the then-incumbent PAN. This study reveals the importance of remittances in shaping the strategies of Mexican political parties.
Identity, Contingency, and Interaction: Historical Research and Social Science Analysis of Nation-State Proliferation
Authors: Tesser Lynn M. 
Published: June 2019

AbstractScholars of nation-building and secession tend to prioritize elite or broader nationalist activism when explaining the proliferation of nation-states. Yet, recent historical research reveals a major finding: the influence of great powers tended to eclipse nationalist mobilization for new states in Latin America, the Balkans, Anatolia, and Central and Eastern Europe. Drawing on recent trends in historical research largely unknown in other fields, this article examines context, timing, and event sequencing to provide a new approach to multi-case research on nation-state proliferation. Major power recognition of new states in the Balkans also emerges as transformational for the post-World War I replacement of dynastic empires with nation-states in Europe. These findings suggest a shift of focus to the interplay of nationalist activism and great power policy for explaining the spread of nation-states.
Circulating calcium levels and the risk of type 2 diabetes: a systematic review and meta-analysis
Authors: Zhu J. , Xun P. , Bae J. C. , Kim J. H. , Kim D. J. , Yang K. , He K. 
Published: June 2019

AbstractAbnormal Ca homeostasis has been associated with impaired glucose metabolism. However, the epidemiological evidence is controversial. We aimed to assess the association between circulating Ca levels and the risk of type 2 diabetes mellitus (T2DM) or abnormal glucose homeostasis through conducting a systematic review and meta-analysis. Eligible studies were identified by searching electronic database (PubMed, Embase and Google Scholar) and related references withde novoresults from primary studies up to December 2018. A random-effects meta-analysis was performed to estimate the weighted relative risks (RR) and 95 % CI for the associations. The search yielded twenty eligible publications with eight cohort studies identified for the meta-analysis, which included a total of 89 165 participants. Comparing the highest with the lowest category of albumin-adjusted serum Ca, the pooled RR was 1·14 (95 % CI 1·05, 1·24) for T2DM (n51 489). Similarly, serum total Ca was associated with incident T2DM (RR 1·25; 95 % CI 1·10, 1·42) (n64 502). Additionally, the adjusted RR for 1 mg/dl increments in albumin-adjusted serum Ca or serum total Ca levels was 1·16 (95 % CI 1·07, 1·27) and 1·19 (95 % CI 1·11, 1·28), respectively. The observed associations remained with the inclusion of a cohort study with ionised Ca as the exposure. However, data pooled from neither case–control (n4) nor cross-sectional (n8) studies manifested a significant correlation between circulating Ca and glucose homeostasis. In conclusion, accumulated data from the cohort studies suggest that higher circulating Ca levels are associated with an augmented risk of T2DM.
Mixed local and ultra-distal volcanic ash deposition within the Upper Cretaceous Kanguk Formation, Sverdrup Basin, Canadian Arctic Islands
Authors: Pointon Michael A , Flowerdew Michael J , Hülse Peter , Schneider Simon , Whitehouse Martin J 
Published: June 2019

AbstractThe Upper Cretaceous Kanguk Formation of the Sverdrup Basin, Canadian Arctic Islands, contains numerous diagenetically altered volcanic ash layers (bentonites). Eleven bentonites were sampled from an outcrop section on Ellesmere Island for U–Pb zircon secondary ion mass spectrometry dating and whole-rock geochemical analysis. Two distinct types of bentonite are identified from the geochemical data. Relatively thick (0.1 to 5 m) peralkaline rhyolitic to trachytic bentonites erupted in an intraplate tectonic setting. These occur throughout the upper Turonian to lower Campanian (c. 92–83 Ma) outcrop section and are likely associated with the alkaline phase of the High Arctic Large Igneous Province. Two thinner (<5 cm) subalkaline dacitic to rhyolitic bentonites of late Turonian to early Coniacian age (c. 90–88 Ma) are also identified. The geochemistry of these bentonites is consistent with derivation from volcanoes within an active continental margin tectonic setting. The lack of nearby potential sources of subalkaline magmatism, together with the thinner bed thickness of the subalkaline bentonites and the small size of zircon phenocrysts therein (typically 50–80 μm in length) are consistent with a more distal source area. The zircon U–Pb age and whole-rock geochemistry of these two subalkaline bentonites correlate with an interval of intense volcanism in the Okhotsk–Chukotka Volcanic Belt, Russia. It is proposed that during late Turonian to early Coniacian times intense volcanism within the Okhotsk–Chukotka Volcanic Belt resulted in widespread volcanic ash dispersal across Arctic Alaska and Canada, reaching as far east as the Sverdrup Basin, more than 3000 km away.
Travelling waves in a reaction-diffusion system modelling farmer and hunter-gatherer interaction in the Neolithic transition in Europe
Authors: TSAI JE-CHIANG , KABIR M. HUMAYUN , MIMURA MASAYASU 
Published: June 2019

AbstractRecently we have proposed a monostable reaction-diffusion system to explain the Neolithic transition from hunter-gatherer life to farmer life in Europe. The system is described by a three-component system for the populations of hunter-gatherer (H), sedentary farmer (F1) and migratory one (F2). The conversion between F1 and F2 is specified by such a way that if the total farmers F1 + F2 are overcrowded, F1 actively changes to F2, while if it is less crowded, the situation is vice versa. In order to include this property in the system, the system incorporates a critical parameter (say F0) depending on the development of farming technology in a monotonically increasing way. It determines whether the total farmers are either over crowded (F1 + F2 >F0) or less crowded (F1 + F2 <F0) ( [9, 20]). Previous numerical studies indicate that the structure of travelling wave solutions of the system is qualitatively similar to the one of the Fisher-KPP equation, that the asymptotically expanding velocity of farmers is equal to the minimal velocity (say cm(F0)) of travelling wave solutions, and that cm(F0) is monotonically decreasing as F0 increases. The latter result suggests that the development of farming technology suppresses the expanding velocity of farmers. As a partial analytical result to this property, the purpose of this paper is to consider the two limiting cases where F0 = 0 and F0 → ∞, and to prove cm(0)>cm(∞).
Exchange of material between solar systems by random stellar encounters
Authors: Zubrin Robert 
Published: June 2019

AbstractIt is shown that a mechanism involving only random motion of the sun with respect to the surrounding star field can account for the ~1 per 25 Myr characteristic frequency of large cometary impacts on Earth. In the proposed mechanism, the sun travels through the Oort Cloud of an encounter star, most typically a Type M dwarf, while the dwarf flies through the Oort cloud of our Sun. As a result, Oort Cloud objects from our Solar System are precipitated in large numbers to impact planets in the dwarf star system, while the dwarf's Oort Cloud objects are destabilized to impact planets in our Solar System. It is shown that it is this exchange of Oort cloud object between stellar systems, rather than the precipitation of Oort Cloud objects within a stellar system, that can account for the apparent periodicity of mass extinctions. Because the sun is more massive than ~90% of stars, its Oort cloud extends further, resulting in it delivering about a factor of three more bombardments on other solar systems than our Solar System receives. About 60% of the bombardments on our Solar System are found to be delivered by Type M dwarfs, about 20% by type K dwarfs, with the remaining 20% being delivered by stars of type G or larger. Foreign star Oort cloud objects can be captured by our Sun at typical ranges of 10 AU, resulting in a cometary approach to perihelion within a few years. It is found that assuming an effective Oort Cloud radius of 40 000 AU for a star of solar mass, increasing in size with the square root of the mass, accounts for the observed characteristic frequency of mass extinction events on Earth, given the local stellar number density of 0.003 stars per cubic light year. The frequency of mass extinction events in other solar systems would increase or decrease in linear proportion to the local stellar number density. It is shown that this exchange of materials between solar systems during close stellar encounters could be an important mechanism for spreading life throughout the galaxy. Implications for the evolution of life on Earth and in other solar systems are discussed.
Liberalizing, state building, and getting to Denmark: analyzing 21st-century institutional change
Authors: Murphy Ryan H. 
Published: June 2019

AbstractThis paper undertakes a descriptive analysis of changes in economic institutions across countries from 2000 to 2016, using Economic Freedom of the World and the “State Economic Modernity” index. This latter index is a recent creation, similar conceptually to state capacity, measuring what can variously be thought of as state building, effectiveness, and economic power. These two indexes are used in concert with one another to classify countries into eight directions of institutional change. Despite recent pessimism, countries besides those at the top world income bracket have continued to liberalize, while wealthy countries have merely stagnated. At the high level aggregates, there is little movement in state economic modernity over this period, although there is considerably heterogeneity among individual countries. Of those measured, Rwanda is the single country to make the greatest movement toward the development benchmark of “Getting to Denmark.”