bluuebunny/crossref_metadata_2025_split huggingface dataset:
Review of Introduction To Property Testing by Oded Goldreich
Authors: Upadhyay Sarvagya 
Published: January 2021

The area of property testing is concerned with designing methods to decide whether an input object possesses a certain property or not. Usually the problem is described as a promise problem: either the input object has the property or the input object is far from possessing the property. Here, the meaning of object being far from possessing the property is based on a specified and meaningful notion of distance.
The main objective of property testing is accomplishing this decision making by developing a super efficient tester. A tester that reads through the entire object can easily determine whether the property is satisfied or not. However, one wishes the tester to probe the input at very few random locations and determine whether the property is satisfied. As such, randomness is a necessary ingredient for testing and having the tester erring on few instances is a necessary price to pay for designing highly efficient methodologies.
Much of the literature on property testing has focused on two types of objects: functions and graphs. Naturally they form the major portion of the book: functions are discussed from Chapters 2 to 6 and graph properties are discussed from Chapters 8 to 10. The final three chapters focus on distribution testing, probabilistically checkable proofs (PCPs) and locally testable codes, and ramifications of property testing on other related topics in Computer Science and Statistics. A separate chapter is devoted to query lower bound techniques.
Review of Forbidden Configurations in Discrete Geometry by David Eppstein
Authors: Green Frederic 
Published: January 2021

In 1930, the mathematician Esther Klein observed that any five points in the plane in general position (i.e., no three points forming a line) contain four points forming a convex quadrilateral. This innocentsounding discovery led to major lines of research in discrete geometry. Klein's friends Paul Erdős and George Szekeres generalized this theorem, and also conjectured that 2k-2 + 1 points (again in general position) would be enough to force a convex k-gon to exist. The resolution of this conjecture became known as the "happy ending problem," because Klein and Szekeres ended up getting married. The unhappy side is that it has, to date, not been completely solved, although a recent breakthrough of Suk made significant progress.
This both mathematically and personally charming little story is a great beginning for this elegant book about discrete geometry. It typifies the type of problems that are studied throughout, and also captures the spirit of curiosity that drives such studies. The book covers many problems that lie at the intersection of three fields: discrete geometry, algorithms and computational complexity.
The Minority SafePack Initiative and Universal Basic Income: a Combination to Address Minority Issues in the European Union?
Authors: Willis Craig 
Published: January 2021

Abstract
The Minority SafePack Initiative (mspi) calls for a pact between minorities and majorities in order to preserve, develop and promote the linguistic and cultural diversity in Europe resulting from the high number of national minorities inside the European Union. This article examines the theory behind universal basic income as well as two policy proposals on the EU level and how these overlap with the stated goals and broader aims of the mspi. Developing four core areas as assessment criteria, the article finds that Universal Basic Income (UBI) theory overlaps significantly in terms of potential impact on the capacity for living in homeland, learning in mother tongue, preservation and development of identity and culture, and aiming for equality. These potentially diminish if the basic income amount is not enough to meet basic needs, plus the narrative differs depending on the funding mechanism.
Diversity, Autonomy and Solidarity in Multinational States: Current Developments in the Spanish-Catalan and the Jews-Arabs Political Disputes
Authors: Khen Hilly Moodrick-Even , Ninet Antoni Abat i 
Published: January 2021

Abstract
The concept of the nation state – and specifically the tension between affirming solidarity among nation-state compatriots and respecting national minorities’ rights in order to preserve diversity and secure their autonomy – has been on the global agenda over the last two centuries, especially in Europe. In recent years, two cases, in Catalonia and in Israel – different in many respects but similar in others – serve as inspiring test cases for analysing questions of national identities and state cohesion. Both of these cases portray the dilemmas surrounding national identity in an allegedly dichotomic fashion, thus requiring a choice between independence and secession or unionism and assimilation. This article suggests that a dichotomic perspective is not compelling and that solidarity and autonomy are not necessarily contradictory. It explores the connection between solidarity and autonomy and applies the analysis to the case studies of Catalonia and Israel separately, given the unique characteristics of each case.
The Observed Relationship between Pacific SST Variability and Hadley Cell Extent Trends in Reanalyses
Authors: Rollings Michael , Merlis Timothy M. 
Published: January 2021

AbstractReanalysis and other observationally based estimates suggest that the tropics have expanded more than simulated by coupled climate models with historical radiative forcing. Previous research has attempted to reconcile this discrepancy by using climate model simulations with constrained tropical Pacific sea surface temperatures (SSTs) to account for the role of internal variability. Here the relationships between Hadley cell extent and internal SST variability and long-term warming are analyzed using purely observational techniques. Using linearly independent components of SST variability with reanalysis datasets, the statistical relationship between Pacific variability and Hadley cell extent is quantified by time scale. There is a strong correlation between North Pacific decadal SST variability and Southern Hemisphere Hadley cell extent. Conversely, there is a weaker observed relation between El Niño–Southern Oscillation (ENSO) and Hadley cell extent when low-frequency variability is filtered out of the ENSO signal. The observed linear sensitivity of Hadley cell width to long-term warming agrees with coupled general circulation model experiments when accounting for uncertainties, and there is a statistically significant relationship between Northern Hemisphere Hadley cell extent and long-term warming during boreal autumn.
Assessing Sensitivity of MERRA-2 to AMSU-A in the Upper Stratosphere
Authors: Chattopadhyay Mohar , McCarty Will , Moradi Isaac 
Published: January 2021

AbstractMicrowave temperature sounders provide key observations in data assimilation, both in the current and historical global observing systems, as they provide the largest amount of horizontal and vertical temperature information due to their insensitivity to clouds. In the Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2), microwave sounder radiances from the Advanced Microwave Sounding Unit-A (AMSU-A) are assimilated beginning with NOAA-15 and continuing through the current period. The time series of observation minus background statistics for AMSU-A channels sensitive to the upper stratosphere and lower mesosphere show variabilities due to changes in the AMSU-A constellation in the early AMSU-A period. Noted discrepancies are seen at the onset and exit of AMSU-A observations on the NOAA-15, NOAA-16, NOAA-17, and NASA EOS Aqua satellites. This effort characterizes the sensitivity, both in terms of the observations and the MERRA-2 data. Furthermore, it explores the use of reprocessed and intercalibrated datasets to evaluate whether these homogenized observations can reduce the disparity due to change in instrumental biases against the model background. The results indicate that the AMSU-A radiances used in MERRA-2 are the fundamental cause of this interplatform sensitivity, which can be mitigated by using reprocessed data. The results explore the importance of the reprocessing of the AMSU-A radiances as well as their intercalibration.
Downstream Evolution and Coastal-to-Inland Transition of Landfalling Lake-Effect Systems
Authors: Gowan Thomas M. , Steenburgh W. James , Minder Justin R. 
Published: January 2021

Abstract
The distribution and intensity of lake- and sea-effect (hereafter lake-effect) precipitation are strongly influenced by the mode of landfalling lake-effect systems. Here, we used idealized large-eddy simulations to investigate the downstream evolution and coastal-to-inland transition of two lake-effect modes: 1) a long-lake-axis-parallel (LLAP) band generated by an oval body of water (hereafter lake; e.g., Lake Ontario) and 2) broad-coverage, open-cell convection generated by an open lake (e.g., Sea of Japan). Under identical atmospheric conditions and lake-surface temperatures, the oval lake generates a LLAP band with heavy precipitation along the midlake axis, whereas the open lake generates broad-coverage, open-cell convection with widespread, light accumulations. Over the oval lake, the LLAP band features a thermally forced and diabatically enhanced cross-band secondary circulation with convergence and ascent over the midlake axis. Downstream of the lake, flanking airstreams that avoid lake modification merge beneath the band where they experience sublimational cooling, producing a cold pool. At the upstream edge of the cold pool, a coastal baroclinic zone forms. Above this zone, ascent and hydrometeor mass growth are maximized, resulting in an inland precipitation maximum due to subsequent hydrometeor transport and fallout. Over the open lake, individual open cells grow larger and stronger with overwater extent, but a convective-to-stratiform transition begins at the coast. Here, convective vigor decays, mesoscale ascent begins, and enhanced hydrometeor growth results in an inland precipitation maximum. These results highlight variations in the coastal-to-inland transition of lake-effect systems that ultimately influence the distribution and intensity of lake-effect precipitation.
Food and water insecurity as causes of social unrest: Evidence from geolocated Twitter data
Authors: Koren Ore , Bagozzi Benjamin E , Benson Thomas S 
Published: January 2021

Research often fails to account for the specific pathways by which climatic factors can cause social unrest. One challenge lies in understanding the distinct effects of food insecurity and water insecurity – which we term ‘staple insecurities’ – while accounting for their interrelated nature, especially at high-resolution spatio-temporal scales. To unpack these dynamics, we leverage geolocated Twitter data across urban areas in Kenya and deploy a supervised machine learning approach to separately identify geolocated tweets concerning food and water insecurity, in both English and Swahili. The data are then aggregated to create daily measures of food and water insecurity for standardized grid-cells to examine how perceived food insecurity moderates and/or reinforces perceived water insecurity’s impacts on social unrest, and vice versa. Our findings suggest that food and water insecurities’ respective effects should be interpreted as mutually reinforcing – in compelling citizens to take to the streets – rather than as independent. Those concerned with climate change’s impact on conflict should hence endeavor to jointly account for both forms of insecurity, and their interactive effects.
Clinical assessment of stabilisation of renal function after nephrectomy
Authors: Sarkar Debansu , Agrawal Akash , Pal Dilip Kumar 
Published: January 2021

Introduction and objective: Nephrectomy leads to derangement of renal function and various adaptive changes by the remaining kidney over a period of time. This study is performed to evaluate the amount of derangement of renal function in donor and radical nephrectomy, how much the remaining kidney adapts over a period of time and the time taken for stabilisation of renal function. Method: A total of 60 patients who underwent nephrectomy (Radical/Donor) were followed up for 12 months with serial estimation of renal function and was compared with preoperative renal function. Data was analysed with statistical analysis. Result: Patients who underwent radical nephrectomy had 37% initial decline in renal function which was later stabilised at 19% lower than baseline value. Patient who underwent donor nephrectomy had initially 39% decline in renal function which was later stabilised at 24% lower than normal. Conclusion: Removal of functional renal tissue led to reduction of renal function. This decline is more evident in the initial post-operative period and then begin to stabilise over months. The greater is the amount of normal tissue removed, the greater is the reduction of renal function and more time it will take to stabilise, increasing overall morbidity of the patient. This study suggests that even patients with normal GFRs should be followed up postoperatively to determine their ultimate renal functional outcomes.
Are Swedish swingers a risk group for sexually transmitted infections?
Authors: Andersson Nirina , Ejnestrand Jennifer , Lidgren Yvonne , Allard Annika , Boman Jens , Nylander Elisabet 
Published: January 2021

The aim of this study was to investigate whether Swedish swingers constitute a risk group for sexually transmitted infections (STIs). Two swinger clubs were invited to participate. At swinger meetings, members were offered an STI sampling kit and a questionnaire. Samples were analyzed for Chlamydia trachomatis, Neisseria gonorrhoeae, Mycoplasma genitalium, and Trichomonas vaginalis using a multiplex real-time polymerase chain reaction assay. In total, 235 swingers participated (118 women and 117 men). Urogenital C. trachomatis prevalence was 1.7%. Urogenital M. genitalium prevalence was 7.6% for women and 4.3% for men. No one tested positive for N. gonorrhoeae or T. vaginalis. For women, the mean number of unprotected temporary sex partners within the last 12 months was four men (range 0–35) and three women (range 0–50). Among men, the mean number of unprotected temporary sex partners within the last 12 months was five women (range 0–50) and 0 men (range 0–10). During vaginal sex, 46.6% women and 38.5% men always used protection with a temporary sex partner. Swedish swingers did not seem to have an increased prevalence of STIs. However, there was high-risk sexual behavior with unprotected sex and multiple sex partners, thereby making them a vulnerable group for acquiring STIs.
Surgical Tracheostomy Outcomes in COVID‐19–Positive Patients
Authors: Courtney Alona , Lignos Leda , Ward Patrick A. , Vizcaychipi Marcela P. ,   Chelwest COVID‐19 AICU Consortium
Published: January 2021

ObjectiveThe aim of this case series was to demonstrate that surgical tracheostomy can be undertaken safely in critically ill mechanically ventilated patients with coronavirus disease 2019 (COVID‐19) and that it is an effective weaning tool.Study DesignRetrospective case series.SettingSingle academic teaching hospital in London.MethodsAll adult patients admitted to the adult intensive care unit (AICU), diagnosed with severe COVID‐19 infection and requiring surgical tracheostomy between the March 10, 2020, and May 1, 2020, were included. Data collection focused upon patient demographics, AICU admission data, tracheostomy‐specific data, and clinical outcomes.ResultsTwenty patients with COVID‐19 underwent surgical tracheostomy. The main indication for tracheostomy was to assist in respiratory weaning. Patients had undergone mechanical ventilation for a median of 16.5 days prior to surgical tracheostomy. Tracheostomy remained in situ for a median of 12.5 days. Sixty percent of patients were decannulated at the end of the data collection period. There were no serious immediate or short‐term complications. Surgical tracheostomy facilitated significant reduction in intravenous sedation at 48 hours after tracheostomy formation. There was no confirmed COVID‐19 infection or reported sickness in the operating surgical or anesthetic teams.ConclusionSurgical tracheostomy has been demonstrated to be an effective weaning tool in patients with severe COVID‐19 infection.
Evaluation of 18F-FDG PET/CT images acquired with a reduced scan time duration in lymphoma patients using the digital biograph vision
Authors: Weber Manuel , Jentzen Walter , Hofferber Regina , Herrmann Ken , Fendler Wolfgang Peter , Rischpler Christoph , Umutlu Lale , Conti Maurizio , Costa Pedro Fragoso , Sraieb Miriam , Kersting David 
Published: January 2021

Abstract
Background
The superior accuracy and sensitivity of 18F-FDG-PET/CT in comparison to morphological imaging alone leads to an upstaging in up to 30% of lymphoma patients. Novel digital PET/CT scanners might enable to reduce administered tracer activity or scan time duration while maintaining diagnostic performance; this might allow for a higher patient throughput or a reduced radiation exposure, respectively. In particular, the radiation exposure reduction is of interest due to the often young age and high remission rate of lymphoma patients.

Methods
Twenty patients with (suspected) lymphoma (6 for initial staging, 12 after systemic treatment, 2 in suspicion of recurrence) sequentially underwent 18F-FDG-PET/CT examinations on a digital PET/CT (Siemens Biograph Vision) with a total scan time duration of 15 min (reference acquisition protocol) and 5 min (reduced acquisition protocol) using continuous-bed-motion. Both data sets were reconstructed using either standalone time of flight (TOF) or in combination with point spread function (PSF), each with 2 and 4 iterations. Lesion detectability by blinded assessment (separately for supra- and infradiaphragmal nodal lesions and for extranodal lesions), lesion image quantification, and image noise were used as metrics to assess diagnostic performance. Additionally, Deauville Score was compared for all patients after systemic treatment.

Results
All defined regions were correctly classified in the images acquired with reduced emission time, and therefore, no changes in staging were observed. Lesion quantification was acceptable, that is, mean absolute percentage deviation of maximum and peak standardized uptake values were 6.8 and 6.4% (derived from 30 lesions). A threefold reduction of scan time duration led to an increase in image noise from 7.1 to 11.0% (images reconstructed with 4 iterations) and from 4.7 to 7.2% (images reconstructed with 2 iterations). No deviations in Deauville Score were observed.

Conclusion
These results suggest that scan time duration or administered tracer activity can be reduced threefold without compromising diagnostic performance. Especially a reduction of administered activity might allow for a lower radiation exposure and better health economics. Larger trials are warranted to confirm our results.
Development of high-resolution future ocean regional projection datasets for coastal applications in Japan
Authors: Nishikawa Shiro , Wakamatsu Tsuyoshi , Ishizaki Hiroshi , Sakamoto Kei , Tanaka Yusuke , Tsujino Hiroyuki , Yamanaka Goro , Kamachi Masafumi , Ishikawa Yoichi 
Published: January 2021

AbstractIn this study, we developed two high-resolution future ocean regional projection datasets for coastal applications in Japan, in which we made use of dynamical downscaling via regional ocean models with atmospheric forcing from two climate models (i.e., MIROC5 and MRI-CGCM3) participating in Coupled Model Intercomparison Project Phase 5 (CMIP5) under historical, representative concentration pathway (RCP) 2.6, and RCP8.5 scenarios. The first dataset was an eddy-resolving 10-km resolution product covering the North Pacific Ocean area and ranging continuously from 1981 to 2100, in which the Kuroshio current and mesoscale structures were reasonably resolved. The second dataset was a 2-km resolution product covering the regional domain surrounding Japan and comprising 10–15-year time slices, in which the coastal geometry and current structure were resolved even more realistically. An important feature of these datasets was the availability of reference datasets based on atmospheric and oceanic reanalysis data for cross-validation during the historical run period. Using these reference datasets, biases of regional surface thermal properties and the Kuroshio states during the historical run period were evaluated, which constitute important information for users of the datasets. In these downscaled datasets, the future surface thermal responses were generally consistent with those of their original data. Utilizing the high-resolution property of the downscaled data, possible future impact analyses regarding coastal phenomena such as strait throughflows, coastal sea level variability, and the Kuroshio intrusion phenomenon into bays (“Kyucho” phenomenon) were demonstrated and the important role of the Kuroshio state representation was indicated, which had proved difficult to analyze using the low-resolution projection data. Given these properties, the present datasets would be useful in climate change adaptation studies regarding the Japanese coastal region.
Treatment of complex laryngotracheal stenosis in childhood–experience of a tertiary University Hospital from 2016 to 2019
Authors: Avelino Melissa Ameloti Gomes , da Silveira Botacin Laís , Coutinho Miguel Angel Corrales 
Published: January 2021

Abstract
Background
Laryngotracheal stenosis is a major cause of airway obstruction in pediatric age. The correction of such abnormality still remains a challenge, both because of anatomical issues in childhood and also due to the difficulty in having properly trained professionals and adequate hospital facilities. As treatment, many different surgical techniques are offered ranging from endoscopic and less invasive procedures to open surgeries, such as laryngotracheal reconstruction and cricotracheal resection. The treatment for complex laryngotracheal stenosis is considered successful when we have decannulation or resolution of respiratory failure with release from intensive care unit. Eighteen patients who were monitored at the pediatric otorhinolaryngology service between 2016 and 2019 were diagnosed with complex stenosis, with the collection of demographic data, comorbidities, degree of initial stenosis, post-treatment aspect, and whether or not decannulation occurred.

Results
Of the eighteen cases, three had congenital stenosis, fourteen had acquired stenosis, and one had mixed stenosis. Ages ranged from 4 months old to 15 years old. Six (33.3%) underwent endoscopic dilation procedures only, six (33.3%) underwent laryngotracheoplasty, and five (27.7%) cricotracheal resections. One patient underwent a slide tracheoplasty. Seven patients (38.8%) had to undergo more than one type of procedure to improve stenosis. Out of the eighteen patients, three of them were never tracheostomized. Of the remaining fifteen patients, fourteen (93.3%) were decannulated.

Conclusions
The success rate in decannulation or the resolution of respiratory failure with discharge from the ICU, after the procedures for correcting stenosis in childhood in our service, was 94.4%.