bluuebunny/crossref_metadata_2025_split huggingface dataset:
A review of spam email detection: analysis of spammer strategies and the dataset shift problem
Authors: Jáñez-Martino Francisco , Alaiz-Rodríguez Rocío , González-Castro Víctor , Fidalgo Eduardo , Alegre Enrique 
Published: May 2022

AbstractSpam emails have been traditionally seen as just annoying and unsolicited emails containing advertisements, but they increasingly include scams, malware or phishing. In order to ensure the security and integrity for the users, organisations and researchers aim to develop robust filters for spam email detection. Recently, most spam filters based on machine learning algorithms published in academic journals report very high performance, but users are still reporting a rising number of frauds and attacks via spam emails. Two main challenges can be found in this field: (a) it is a very dynamic environment prone to the dataset shift problem and (b) it suffers from the presence of an adversarial figure, i.e. the spammer. Unlike classical spam email reviews, this one is particularly focused on the problems that this constantly changing environment poses. Moreover, we analyse the different spammer strategies used for contaminating the emails, and we review the state-of-the-art techniques to develop filters based on machine learning. Finally, we empirically evaluate and present the consequences of ignoring the matter of dataset shift in this practical field. Experimental results show that this shift may lead to severe degradation in the estimated generalisation performance, with error rates reaching values up to $$48.81\%$$

48.81
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The origins and development of statistical approaches in non-parametric frontier models: a survey of the first two decades of scholarly literature (1998–2020)
Authors: Moradi-Motlagh Amir , Emrouznejad Ali 
Published: May 2022

AbstractThis paper surveys the increasing use of statistical approaches in non-parametric efficiency studies. Data Envelopment Analysis (DEA) and Free Disposable Hull (FDH) are recognized as standard non-parametric methods developed in the field of operations research. Kneip et al. (Econom Theory, 14:783–793, 1998) and Park et al. (Econom Theory, 16:855–877, 2000) develop statistical properties of the variable returns-to-scale (VRS) version of DEA estimators and FDH estimators, respectively. Simar & Wilson (Manag Sci 44, 49–61, 1998) show that conventional bootstrap methods cannot provide valid inference in the context of DEA or FDH estimators and introduce a smoothed bootstrap for use with DEA or FDH efficiency estimators. By doing so, they address the main drawback of non-parametric models as being deterministic and without a statistical interpretation. Since then, many articles have applied this innovative approach to examine efficiency and productivity in various fields while providing confidence interval estimates to gauge uncertainty. Despite this increasing research attention and significant theoretical and methodological developments in its first two decades, a specific and comprehensive bibliometric analysis of bootstrap DEA/FDH literature and subsequent statistical approaches is still missing. This paper thus, aims to provide an extensive overview of the key articles and their impact in the field. Specifically, in addition to some summary statistics such as citations, the most influential academic journals and authorship network analysis, we review the methodological developments as well as the pertinent software applications.
Relationship analysis between greenwashing and environmental performance
Authors: Zhang Kesen , Pan Zhen , Janardhanan Mukund , Patel Imran 
Published: May 2022

AbstractThis paper fills the gap in the study of the impact of Chinese companies' environmental performance (EP) on greenwashing based on the listed companies in China from 2010 to 2018. The relationship between EP and greenwashing is analyzed based on legitimacy theory and signal theory. From the empirical analysis, it is found that there exists a negative correlation between EP and greenwashing which supports the signal theory. Based on resource-based theory analysis, the impacts of environmental subsidies and political connections on the relationship between environmental performance and greenwashing are also analyzed. EP of enterprises receiving environmental protection subsidy has a greater inhibition effect on greenwashing. The negative effect of EP on greenwashing of state-owned enterprises is bigger than that of non-state-owned enterprises. This study can provide reference for government departments in deepening the reform of government environmental subsidies and environmental governance of state-owned enterprises.
The portrayal of the future as legitimacy construction: discursive strategies in highly ranked business schools’ external communication
Authors: Géring Zsuzsanna , Tamássy Réka , Király Gábor , Rakovics Márton 
Published: May 2022

AbstractIn this paper, we investigate how highly ranked business schools construct their legitimacy claims by analysing their online organisational communication. We argue that in the case of higher education institutions in general, and business schools in particular, the discursive formation of these legitimacy claims is strongly connected to the future. Consequently, we utilise corpus-based discourse analysis of highly ranked business schools’ website communication by focusing on sentences containing the expression ‘future’. At first, we analysed the future-related language use to reveal the general future picture in the corpus. Furthermore, by combining qualitative and quantitative textual data, we identified six typical agency frames (i.e. preparing, shaping, adjusting, exploring, personal future, responsibility) about the future. By examining the co-occurrence of these frames, we were able to identify different discursive strategies. As we connected our findings to general societal phenomena we could interpret why and how business schools utilise these discursive strategies to (re)create and maintain their legitimacy.
Rebuttal to Douglas and Elliott
Authors: Hudson Robert 
Published: May 2022

AbstractIn “Should We Strive to Make Science Bias‑Free? A Philosophical Assessment of the Reproducibility Crisis”, I argue that the problem of bias in science, a key factor in the current reproducibility crisis, is worsened if we follow Heather Douglas and Kevin C. Elliott’s advice and introduce non-epistemic values into the evidential assessment of scientific hypotheses. In their response to my paper, Douglas and Elliott complain that I misrepresent their views and fall victim to various confusions. In this rebuttal I argue, by means of an examination of their published views, that my initial interpretation of their work is accurate and that, in their hands, science is generally prone to deviations from truth.
Teacher expertise for fostering at-risk students’ understanding of basic concepts: conceptual model and evidence for growth﻿
Authors: Prediger Susanne , Dröse Jennifer , Stahnke Rebekka , Ademmer Claudia 
Published: May 2022

AbstractVarious intervention programs for fostering at-risk students’ understanding of basic concepts (such as place value understanding or meanings of multiplication and division) have been developed and evaluated. However, little is known about the teacher expertise required to enact these intervention programs, and how this teacher expertise can be promoted. The article suggests a conceptual model for teacher expertise for fostering at-risk students’ understanding based on three recurrent jobs: (a) specify learning content (in basic concepts), (b) monitor students’ learning progress (in basic concepts) and (3) enhance students’ understanding (of basic concepts). Mastering these jobs with productive teaching practices involves four orientations in particular (conceptual rather than procedural orientation, diagnostic rather than syllabus-led orientation, communicative rather than individualistic orientation, and long-term rather than short-term orientation) as well as detailed pedagogical content categories for unpacking relevant knowledge elements. The paper reports on the professional development program Mastering Math which aims at promoting this expertise and its evaluation using a pre–post-design. For 95 participating teachers, the practices for specifying goals and monitoring and enhancing at-risk students’ understanding were captured in self-reports and situated in vignette-based activities for eliciting diagnostic judgments. Teachers’ development across different aspects of their expertise from the beginning and the end of the 1-year PD reveals the first quantitative evidence that the PD was effective in promoting growth of expertise. Whereas specifying and monitoring practices had substantially developed, the enhancement practices were hindered by a persistent short-term orientation.
Neutralizing SARS-CoV-2 Antibodies in Commercial Immunoglobulin Products Give Patients with X-Linked Agammaglobulinemia Limited Passive Immunity to the Omicron Variant
Authors: Lindahl Hannes , Klingström Jonas , Da Silva Rodrigues Rui , Christ Wanda , Chen Puran , Ljunggren Hans-Gustaf , Buggert Marcus , Aleman Soo , Smith C. I. Edvard , Bergman Peter 
Published: May 2022

AbstractImmunodeficient individuals often rely on donor-derived immunoglobulin (Ig) replacement therapy (IGRT) to prevent infections. The passive immunity obtained by IGRT is limited and reflects the state of immunity in the plasma donor population at the time of donation. The objective of the current study was to describe how the potential of passive immunity to SARS-CoV-2 in commercial off-the-shelf Ig products used for IGRT has evolved during the pandemic. Samples were collected from all consecutive Ig batches (n = 60) from three Ig producers used at the Immunodeficiency Unit at Karolinska University Hospital from the start of the SARS-CoV-2 pandemic until January 2022. SARS-CoV-2 antibody concentrations and neutralizing capacity were assessed in all samples. In vivo relevance was assessed by sampling patients with XLA (n = 4), lacking endogenous immunoglobulin synthesis and on continuous Ig substitution, for plasma SARS-CoV-2 antibody concentration. SARS-CoV-2 antibody concentrations in commercial Ig products increased over time but remained inconsistently present. Moreover, Ig batches with high neutralizing capacity towards the Wuhan-strain of SARS-CoV-2 had 32-fold lower activity against the Omicron variant. Despite increasing SARS-CoV-2 antibody concentrations in commercial Ig products, four XLA patients on IGRT had relatively low plasma concentrations of SARS-CoV-2 antibodies with no potential to neutralize the Omicron variant in vitro. In line with this observation, three out the four XLA patients had symptomatic COVID-19 during the Omicron wave. In conclusion, 2 years into the pandemic the amounts of antibodies to SARS-CoV-2 vary considerably among commercial Ig batches obtained from three commercial producers. Importantly, in batches with high concentrations of antibodies directed against the original virus strain, protective passive immunity to the Omicron variant appears to be insufficient.
Elementary School Students’ Subjective Well-Being Before and During the COVID-19 Pandemic: A Longitudinal Study
Authors: Steinmayr Ricarda , Paschke Patrick , Wirthwein Linda 
Published: May 2022

AbstractFirst empirical results indicate that the COVID-19 pandemic has a negative impact on adolescents’ and adults’ subjective well-being. In the present study we focus on the subjective well-being of elementary school children before and after the first pandemic-related school lockdown and examine if possible declines in subjective well-being are especially pronounced for some groups, considering socio-economic status, migration background, and gender as moderators. We tested N = 425 elementary school students (mean age: M = 8.19; SD = 1.04) longitudinally with four measurement points (three before the school lockdown and one after) regarding their general life satisfaction, mood, and domain satisfaction regarding peers, family, and school. Piecewise growth curve models revealed a significant decline in positive mood and in satisfaction with the family. Decline in life satisfaction and satisfaction with peers nearly missed significance. The investigated moderators had no impact on the changes in subjective well-being. We conclude that the pandemic had detrimental effects on young children’s subjective well-being.
The evolution of trade credit: new evidence from developed versus developing countries
Authors: Machokoto Michael , Gyimah Daniel , Ibrahim Boulis Maher 
Published: May 2022

AbstractUsing a large sample of listed firms from 72 countries over the period 1990–2019, we document a marked decrease in trade credit that is more pronounced for firms in developed economies relative to those in emerging economies. We find little evidence that firm characteristics drive this trend, as their relation with trade credit remains relatively stable throughout the sample period. We test several competing propositions and find that the listing decade, institutional factors, and financial development explain the downward trajectory in trade credit. We also report diminishing returns to trade credit that are higher in the US and other developed economies than in emerging economies. These results are robust to alternative definitions of trade credit and to controlling for several firm-specific and macroeconomic factors.
What Is Wrong with the International Holocaust Remembrance Alliance’s Definition of Antisemitism?
Authors: Deckers Jan , Coulter Jonathan 
Published: May 2022

AbstractThe International Holocaust Remembrance Alliance (IHRA) developed a ‘Working Definition of Antisemitism’ in 2016. Whilst the definition has received a significant amount of media attention, we are not aware of any comprehensive philosophical analysis. This article analyses this definition. We conclude that the definition and its list of examples ought to be rejected. The urgency to do so stems from the fact that pro-Israel activists can and have mobilised the IHRA document for political goals unrelated to tackling antisemitism, notably to stigmatise and silence critics of the Israeli government. This causes widespread self-censorship, has an adverse impact on freedom of speech, and impedes action against the unjust treatment of Palestinians. We also identify intrinsic problems in the way the definition refers to criticism of Israel similar ‘to that leveled against any other country’, ambiguous wording about ‘the power of Jews as a collective’, lack of clarity as to the Jewish people’s ‘right to self-determination’, and its denial of obvious racism. We consider alternative definitions and prefer one like the Oxford English Dictionary (OED) definition, ‘hostility to or prejudice against Jews’, with the addition of the words ‘as Jews’. We recognise that the Jerusalem Declaration on Antisemitism (JDA) can play a useful purpose in illustrating the shortcomings of the IHRA definition. However, we do not advocate promoting it as the prime international definition. Indeed, we question the efficacy of using complex new definitions to combat racism against Jews or other groups, and instead advocate combatting it through collective action across societies.
Explicit Instruction of Scientific Uncertainty in an Undergraduate Geoscience Field-Based Course
Authors: Bateman Kathryn M. , Wilson Cristina G. , Williams Randolph T. , Tikoff Basil , Shipley Thomas F. 
Published: May 2022

Abstract
Understanding and communicating uncertainty is a key skill needed in the practice of science. However, there has been little research on the instruction of uncertainty in undergraduate science education. Our team designed a module within an online geoscience field course which focused on explicit instruction around uncertainty and provided students with an uncertainty rating scale to record and communicate their uncertainty with a common language. Students then explored a complex, real-world geological problem about which expert scientists had previously made competing claims through geologic maps. Provided with data, expert uncertainty ratings, and the previous claims, students made new geologic maps of their own and presented arguments about their claims in written form. We analyzed these reports along with assessments of uncertainty. Most students explicitly requested geologists’ uncertainty judgments in a post-course assessment when asked why scientists might differ in their conclusions and/or utilized the rating scale unprompted in their written arguments. Through the examination of both pre- and post-course assessments of uncertainty and students’ course-based assessments, we argue that explicit instruction around uncertainty can be introduced during undergraduate coursework and could facilitate geoscience novices developing into practicing geoscientists.
The impact of milk suckling protocol and schedule on body weight and some morphometric measurements of Holstein heifers
Authors: Rashad Amr M. A. , Amin Amani H. , Mahdy Ahmed E. , Aziz Mahmoud A. , El-Barbary Adel S. A. , EL-Hedainy Dalia K. A. 
Published: May 2022

AbstractHaving a successful heifer raising operation is not only relevant financially, but also influential for the future of the dairy herds. Milk feeding has a significant role on the health and growth of calves before weaning, in addition to the direct progressive effects on future performance post-weaning. Therefore, the aim of this study was to compare the effects of constants amount of milk (CMS) versus step-up/step-down (SUSD) on calf performance in two different suckling schedules of suckling milk gradually till 9th weeks of calf age, then decreasing it till weaning. For this study, forty Holstein heifers calves utilized between birth and 8 months of age were randomly divided into four groups of 10 calves each. Grouping was performed according to suckling protocol (constant versus variable) and suckling schedule (2 versus 3 times/day). Each calf suckled 600 kg of milk in a suckling period of 120 days. Body weight (BW), in addition to five body measurements: chest girth (CG), height at wither (HW), height at rump (HR), body length (BL), and diagonal length (DL), were recorded weekly. The heaviest BW was observed on SUSD calves suckling twice/day which had also the highest HW at weaning. Similarly, were BW, HW, and CG at 6 months of age. Also, the same group achieved the largest daily BW (0.902 kg/day), BL (0.246 cm), and CG (0.338 cm/day) gains during the pre-weaning phase. However, CMS suckled 3 times/day calves had the largest daily BW gain between birth and 6 or 8 months of age. CMS twice/day calves had the largest daily gain in CG from weaning to 6 months and from weaning to 8 months of age followed by SUSD suckling 3 times/day calves. Also, CMS twice/day calves had the largest daily gain in rump height from birth to 8 months of age compared to other groups. It can be concluded that when equal amounts of milk were fed during the suckling period, suckling protocol affected growth rate before weaning but that effect diminished as calf age increased after weaning.
Effective photocatalytic degradation of amoxicillin using MIL-53(Al)/ZnO composite
Authors: Fawzy Asmaa , Mahanna Hani , Mossad Mohamed 
Published: May 2022

AbstractA promising hierarchical nanocomposite of MIL-53(Al)/ZnO was synthesized as a visible-light-driven photocatalyst to investigate the degradation of amoxicillin (AMX). MIL-53(Al)/ZnO ultrafine nanoparticles were obtained by preparing Zn-free MIL-53Al and employing it as a reactive template under hydrothermal and chemical conditions. The synthesized nanocomposite (MIL-53(Al)/ZnO) has a low content of Al > 1.5% with significantly different characterizations of the parent compounds elucidated by various analyses such as SEM, TEM, XRD, EDX, and UV–Vis. The effect of operational parameters (catalyst dose (0.2–1.0 g/L), solution pH (3–11), and initial AMX concentration (10–90 mg/L)) on the AMX removal efficiency was studied and optimized by the response surface methodology. A reasonable goodness-of-fit between the expected and experimental values was confirmed with correlation coefficient (R2) equal to 0.96. Under the optimal values, i.e., initial AMX concentration = 10 mg/L, solution pH ~ 4.5, and catalyst dose = 1.0 g/L, 100% AMX removal was achieved after reaction time = 60 min. The degradation mechanism and oxidation pathway were vigorously examined. The AMX degradation ratios slightly decreased after five consecutive cycles (from 78.19 to 62.05%), revealing the high reusability of MIL-53(Al)/ZnO. The AMX removal ratio was improved with enhancers in order ($${\mathrm{IO}}_{4}^{-}$$

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> H2O2 > S2O8−2). The results proved that 94.12 and 98.23% reduction of COD were obtained after 60 and 75 min, respectively. The amortization and operating costs were estimated at 3.3 $/m3 for a large-scale photocatalytic system.
Favipiravir for the treatment of COVID-19 in elderly patients—what do we know after 2 years of COVID-19?
Authors: Papp Henrietta , Lanszki Zsófia , Keserű György M. , Jakab Ferenc 
Published: May 2022

AbstractSince the appearance of coronavirus disease 2019 (COVID-19), numerous studies have been conducted to find effective therapeutics. Favipiravir (FVP) is one of the repurposed drugs which has been authorized in a few countries on an emergency basis to treat COVID-19. Elderly individuals especially 65 years or older are more prone to develop severe illness. We aim to provide a short summary of the current knowledge of the antiviral efficacy of favipiravir with respect to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2)–infected elderly patients. We found that it is rather controversial whether favipiravir is effective against SARS-CoV-2 infection. Data regarding patients 65 years or older is not sufficient to support or reject the usage of favipiravir for COVD-19 treatment. Further studies would be advisable to elicit the efficiency of favipiravir in elderly COVID-19 patients.
Detecting abrupt change in land cover in the eastern Hindu Kush region using Landsat time series (1988–2020)
Authors: Khan Saeed A. , Vanselow Kim A. , Sass Oliver , Samimi Cyrus 
Published: May 2022

AbstractLand cover change in the semi-arid environment of the eastern Hindu Kush region is driven by anthropogenic activities and environmental change impacts. Natural hazards, such as floods presumably influenced by climatic change, cause abrupt change of land cover. So far, little research has been conducted to investigate the spatiotemporal aspects of this abrupt change in the valleys. In order to explore the abrupt change in land cover and floods as its possible drivers in the eastern Hindu Kush, a semi-arid mountain region characterized by complex terrain, vegetation variation, and precipitation seasonality, we analyzed long-term Landsat image time series from 1988 to 2020 using Breaks For Additive Seasonal and Trend (BFAST). Overall, BFAST effectively detected abrupt change by using Landsat-derived Modified Soil Adjusted Vegetation Index (MSAVI). The results of our study indicate that approximately 95% of the study area experienced at least one abrupt change during 1988–2020. The years 1991, 1995, 1998, 2007, and 2016 were detected as the peak years, with the peaks occurring in different seasons. The annual trend of abrupt change is decreasing for the study area. The seasonality of abrupt change at the catchment level shows an increasing trend in the spring season for the southern catchments of Panjkora and Swat. The spatial distribution patterns show that abrupt change is primarily concentrated in the floodplains indicating that flooding is the primary driver of the land cover change in the region. We also demonstrated the accurate detection of past flood events (2015) based on the two case examples of Ayun, Rumbur, and Kalash valleys. The detection of the flood events was verified by fieldwork and historical high-resolution Google Earth imagery. Finally, our study provides an example of applying Landsat time series in a dry mountain region to detect abrupt changes in land cover and analyze impact of natural hazards such as floods.